kernel/drivers/tty/synclinkmp.c

   1 /*
   2  * $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $
   3  *
   4  * Device driver for Microgate SyncLink Multiport
   5  * high speed multiprotocol serial adapter.
   6  *
   7  * written by Paul Fulghum for Microgate Corporation
   8  * paulkf@microgate.com
   9  *
  10  * Microgate and SyncLink are trademarks of Microgate Corporation
  11  *
  12  * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
  13  * This code is released under the GNU General Public License (GPL)
  14  *
  15  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  16  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  19  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  23  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  24  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  25  * OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
  29 #if defined(__i386__)
  30 #  define BREAKPOINT() asm("   int $3");
  31 #else
  32 #  define BREAKPOINT() { }
  33 #endif
  34
  35 #define MAX_DEVICES 12
  36
  37 #include <linux/module.h>
  38 #include <linux/errno.h>
  39 #include <linux/signal.h>
  40 #include <linux/sched.h>
  41 #include <linux/timer.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/pci.h>
  44 #include <linux/tty.h>
  45 #include <linux/tty_flip.h>
  46 #include <linux/serial.h>
  47 #include <linux/major.h>
  48 #include <linux/string.h>
  49 #include <linux/fcntl.h>
  50 #include <linux/ptrace.h>
  51 #include <linux/ioport.h>
  52 #include <linux/mm.h>
  53 #include <linux/seq_file.h>
  54 #include <linux/slab.h>
  55 #include <linux/netdevice.h>
  56 #include <linux/vmalloc.h>
  57 #include <linux/init.h>
  58 #include <linux/delay.h>
  59 #include <linux/ioctl.h>
  60
  61 #include <asm/io.h>
  62 #include <asm/irq.h>
  63 #include <asm/dma.h>
  64 #include <linux/bitops.h>
  65 #include <asm/types.h>
  66 #include <linux/termios.h>
  67 #include <linux/workqueue.h>
  68 #include <linux/hdlc.h>
  69 #include <linux/synclink.h>
  70
  71 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_MODULE))
  72 #define SYNCLINK_GENERIC_HDLC 1
  73 #else
  74 #define SYNCLINK_GENERIC_HDLC 0
  75 #endif
  76
  77 #define GET_USER(error,value,addr) error = get_user(value,addr)
  78 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
  79 #define PUT_USER(error,value,addr) error = put_user(value,addr)
  80 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
  81
  82 #include <asm/uaccess.h>
  83
  84 static MGSL_PARAMS default_params = {
  85         MGSL_MODE_HDLC,                 /* unsigned long mode */
  86         0,                              /* unsigned char loopback; */
  87         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
  88         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
  89         0,                              /* unsigned long clock_speed; */
  90         0xff,                           /* unsigned char addr_filter; */
  91         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
  92         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
  93         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
  94         9600,                           /* unsigned long data_rate; */
  95         8,                              /* unsigned char data_bits; */
  96         1,                              /* unsigned char stop_bits; */
  97         ASYNC_PARITY_NONE               /* unsigned char parity; */
  98 };
  99
 100 /* size in bytes of DMA data buffers */
 101 #define SCABUFSIZE      1024
 102 #define SCA_MEM_SIZE    0x40000
 103 #define SCA_BASE_SIZE   512
 104 #define SCA_REG_SIZE    16
 105 #define SCA_MAX_PORTS   4
 106 #define SCAMAXDESC      128
 107
 108 #define BUFFERLISTSIZE  4096
 109
 110 /* SCA-I style DMA buffer descriptor */
 111 typedef struct _SCADESC
 112 {
 113         u16     next;           /* lower l6 bits of next descriptor addr */
 114         u16     buf_ptr;        /* lower 16 bits of buffer addr */
 115         u8      buf_base;       /* upper 8 bits of buffer addr */
 116         u8      pad1;
 117         u16     length;         /* length of buffer */
 118         u8      status;         /* status of buffer */
 119         u8      pad2;
 120 } SCADESC, *PSCADESC;
 121
 122 typedef struct _SCADESC_EX
 123 {
 124         /* device driver bookkeeping section */
 125         char    *virt_addr;     /* virtual address of data buffer */
 126         u16     phys_entry;     /* lower 16-bits of physical address of this descriptor */
 127 } SCADESC_EX, *PSCADESC_EX;
 128
 129 /* The queue of BH actions to be performed */
 130
 131 #define BH_RECEIVE  1
 132 #define BH_TRANSMIT 2
 133 #define BH_STATUS   4
 134
 135 #define IO_PIN_SHUTDOWN_LIMIT 100
 136
 137 struct  _input_signal_events {
 138         int     ri_up;
 139         int     ri_down;
 140         int     dsr_up;
 141         int     dsr_down;
 142         int     dcd_up;
 143         int     dcd_down;
 144         int     cts_up;
 145         int     cts_down;
 146 };
 147
 148 /*
 149  * Device instance data structure
 150  */
 151 typedef struct _synclinkmp_info {
 152         void *if_ptr;                           /* General purpose pointer (used by SPPP) */
 153         int                     magic;
 154         struct tty_port         port;
 155         int                     line;
 156         unsigned short          close_delay;
 157         unsigned short          closing_wait;   /* time to wait before closing */
 158
 159         struct mgsl_icount      icount;
 160
 161         int                     timeout;
 162         int                     x_char;         /* xon/xoff character */
 163         u16                     read_status_mask1;  /* break detection (SR1 indications) */
 164         u16                     read_status_mask2;  /* parity/framing/overun (SR2 indications) */
 165         unsigned char           ignore_status_mask1;  /* break detection (SR1 indications) */
 166         unsigned char           ignore_status_mask2;  /* parity/framing/overun (SR2 indications) */
 167         unsigned char           *tx_buf;
 168         int                     tx_put;
 169         int                     tx_get;
 170         int                     tx_count;
 171
 172         wait_queue_head_t       status_event_wait_q;
 173         wait_queue_head_t       event_wait_q;
 174         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
 175         struct _synclinkmp_info *next_device;   /* device list link */
 176         struct timer_list       status_timer;   /* input signal status check timer */
 177
 178         spinlock_t lock;                /* spinlock for synchronizing with ISR */
 179         struct work_struct task;                        /* task structure for scheduling bh */
 180
 181         u32 max_frame_size;                     /* as set by device config */
 182
 183         u32 pending_bh;
 184
 185         bool bh_running;                                /* Protection from multiple */
 186         int isr_overflow;
 187         bool bh_requested;
 188
 189         int dcd_chkcount;                       /* check counts to prevent */
 190         int cts_chkcount;                       /* too many IRQs if a signal */
 191         int dsr_chkcount;                       /* is floating */
 192         int ri_chkcount;
 193
 194         char *buffer_list;                      /* virtual address of Rx & Tx buffer lists */
 195         unsigned long buffer_list_phys;
 196
 197         unsigned int rx_buf_count;              /* count of total allocated Rx buffers */
 198         SCADESC *rx_buf_list;                   /* list of receive buffer entries */
 199         SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
 200         unsigned int current_rx_buf;
 201
 202         unsigned int tx_buf_count;              /* count of total allocated Tx buffers */
 203         SCADESC *tx_buf_list;           /* list of transmit buffer entries */
 204         SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
 205         unsigned int last_tx_buf;
 206
 207         unsigned char *tmp_rx_buf;
 208         unsigned int tmp_rx_buf_count;
 209
 210         bool rx_enabled;
 211         bool rx_overflow;
 212
 213         bool tx_enabled;
 214         bool tx_active;
 215         u32 idle_mode;
 216
 217         unsigned char ie0_value;
 218         unsigned char ie1_value;
 219         unsigned char ie2_value;
 220         unsigned char ctrlreg_value;
 221         unsigned char old_signals;
 222
 223         char device_name[25];                   /* device instance name */
 224
 225         int port_count;
 226         int adapter_num;
 227         int port_num;
 228
 229         struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
 230
 231         unsigned int bus_type;                  /* expansion bus type (ISA,EISA,PCI) */
 232
 233         unsigned int irq_level;                 /* interrupt level */
 234         unsigned long irq_flags;
 235         bool irq_requested;                     /* true if IRQ requested */
 236
 237         MGSL_PARAMS params;                     /* communications parameters */
 238
 239         unsigned char serial_signals;           /* current serial signal states */
 240
 241         bool irq_occurred;                      /* for diagnostics use */
 242         unsigned int init_error;                /* Initialization startup error */
 243
 244         u32 last_mem_alloc;
 245         unsigned char* memory_base;             /* shared memory address (PCI only) */
 246         u32 phys_memory_base;
 247         int shared_mem_requested;
 248
 249         unsigned char* sca_base;                /* HD64570 SCA Memory address */
 250         u32 phys_sca_base;
 251         u32 sca_offset;
 252         bool sca_base_requested;
 253
 254         unsigned char* lcr_base;                /* local config registers (PCI only) */
 255         u32 phys_lcr_base;
 256         u32 lcr_offset;
 257         int lcr_mem_requested;
 258
 259         unsigned char* statctrl_base;           /* status/control register memory */
 260         u32 phys_statctrl_base;
 261         u32 statctrl_offset;
 262         bool sca_statctrl_requested;
 263
 264         u32 misc_ctrl_value;
 265         char *flag_buf;
 266         bool drop_rts_on_tx_done;
 267
 268         struct  _input_signal_events    input_signal_events;
 269
 270         /* SPPP/Cisco HDLC device parts */
 271         int netcount;
 272         spinlock_t netlock;
 273
 274 #if SYNCLINK_GENERIC_HDLC
 275         struct net_device *netdev;
 276 #endif
 277
 278 } SLMP_INFO;
 279
 280 #define MGSL_MAGIC 0x5401
 281
 282 /*
 283  * define serial signal status change macros
 284  */
 285 #define MISCSTATUS_DCD_LATCHED  (SerialSignal_DCD<<8)   /* indicates change in DCD */
 286 #define MISCSTATUS_RI_LATCHED   (SerialSignal_RI<<8)    /* indicates change in RI */
 287 #define MISCSTATUS_CTS_LATCHED  (SerialSignal_CTS<<8)   /* indicates change in CTS */
 288 #define MISCSTATUS_DSR_LATCHED  (SerialSignal_DSR<<8)   /* change in DSR */
 289
 290 /* Common Register macros */
 291 #define LPR     0x00
 292 #define PABR0   0x02
 293 #define PABR1   0x03
 294 #define WCRL    0x04
 295 #define WCRM    0x05
 296 #define WCRH    0x06
 297 #define DPCR    0x08
 298 #define DMER    0x09
 299 #define ISR0    0x10
 300 #define ISR1    0x11
 301 #define ISR2    0x12
 302 #define IER0    0x14
 303 #define IER1    0x15
 304 #define IER2    0x16
 305 #define ITCR    0x18
 306 #define INTVR   0x1a
 307 #define IMVR    0x1c
 308
 309 /* MSCI Register macros */
 310 #define TRB     0x20
 311 #define TRBL    0x20
 312 #define TRBH    0x21
 313 #define SR0     0x22
 314 #define SR1     0x23
 315 #define SR2     0x24
 316 #define SR3     0x25
 317 #define FST     0x26
 318 #define IE0     0x28
 319 #define IE1     0x29
 320 #define IE2     0x2a
 321 #define FIE     0x2b
 322 #define CMD     0x2c
 323 #define MD0     0x2e
 324 #define MD1     0x2f
 325 #define MD2     0x30
 326 #define CTL     0x31
 327 #define SA0     0x32
 328 #define SA1     0x33
 329 #define IDL     0x34
 330 #define TMC     0x35
 331 #define RXS     0x36
 332 #define TXS     0x37
 333 #define TRC0    0x38
 334 #define TRC1    0x39
 335 #define RRC     0x3a
 336 #define CST0    0x3c
 337 #define CST1    0x3d
 338
 339 /* Timer Register Macros */
 340 #define TCNT    0x60
 341 #define TCNTL   0x60
 342 #define TCNTH   0x61
 343 #define TCONR   0x62
 344 #define TCONRL  0x62
 345 #define TCONRH  0x63
 346 #define TMCS    0x64
 347 #define TEPR    0x65
 348
 349 /* DMA Controller Register macros */
 350 #define DARL    0x80
 351 #define DARH    0x81
 352 #define DARB    0x82
 353 #define BAR     0x80
 354 #define BARL    0x80
 355 #define BARH    0x81
 356 #define BARB    0x82
 357 #define SAR     0x84
 358 #define SARL    0x84
 359 #define SARH    0x85
 360 #define SARB    0x86
 361 #define CPB     0x86
 362 #define CDA     0x88
 363 #define CDAL    0x88
 364 #define CDAH    0x89
 365 #define EDA     0x8a
 366 #define EDAL    0x8a
 367 #define EDAH    0x8b
 368 #define BFL     0x8c
 369 #define BFLL    0x8c
 370 #define BFLH    0x8d
 371 #define BCR     0x8e
 372 #define BCRL    0x8e
 373 #define BCRH    0x8f
 374 #define DSR     0x90
 375 #define DMR     0x91
 376 #define FCT     0x93
 377 #define DIR     0x94
 378 #define DCMD    0x95
 379
 380 /* combine with timer or DMA register address */
 381 #define TIMER0  0x00
 382 #define TIMER1  0x08
 383 #define TIMER2  0x10
 384 #define TIMER3  0x18
 385 #define RXDMA   0x00
 386 #define TXDMA   0x20
 387
 388 /* SCA Command Codes */
 389 #define NOOP            0x00
 390 #define TXRESET         0x01
 391 #define TXENABLE        0x02
 392 #define TXDISABLE       0x03
 393 #define TXCRCINIT       0x04
 394 #define TXCRCEXCL       0x05
 395 #define TXEOM           0x06
 396 #define TXABORT         0x07
 397 #define MPON            0x08
 398 #define TXBUFCLR        0x09
 399 #define RXRESET         0x11
 400 #define RXENABLE        0x12
 401 #define RXDISABLE       0x13
 402 #define RXCRCINIT       0x14
 403 #define RXREJECT        0x15
 404 #define SEARCHMP        0x16
 405 #define RXCRCEXCL       0x17
 406 #define RXCRCCALC       0x18
 407 #define CHRESET         0x21
 408 #define HUNT            0x31
 409
 410 /* DMA command codes */
 411 #define SWABORT         0x01
 412 #define FEICLEAR        0x02
 413
 414 /* IE0 */
 415 #define TXINTE          BIT7
 416 #define RXINTE          BIT6
 417 #define TXRDYE          BIT1
 418 #define RXRDYE          BIT0
 419
 420 /* IE1 & SR1 */
 421 #define UDRN    BIT7
 422 #define IDLE    BIT6
 423 #define SYNCD   BIT4
 424 #define FLGD    BIT4
 425 #define CCTS    BIT3
 426 #define CDCD    BIT2
 427 #define BRKD    BIT1
 428 #define ABTD    BIT1
 429 #define GAPD    BIT1
 430 #define BRKE    BIT0
 431 #define IDLD    BIT0
 432
 433 /* IE2 & SR2 */
 434 #define EOM     BIT7
 435 #define PMP     BIT6
 436 #define SHRT    BIT6
 437 #define PE      BIT5
 438 #define ABT     BIT5
 439 #define FRME    BIT4
 440 #define RBIT    BIT4
 441 #define OVRN    BIT3
 442 #define CRCE    BIT2
 443
 444
 445 /*
 446  * Global linked list of SyncLink devices
 447  */
 448 static SLMP_INFO *synclinkmp_device_list = NULL;
 449 static int synclinkmp_adapter_count = -1;
 450 static int synclinkmp_device_count = 0;
 451
 452 /*
 453  * Set this param to non-zero to load eax with the
 454  * .text section address and breakpoint on module load.
 455  * This is useful for use with gdb and add-symbol-file command.
 456  */
 457 static bool break_on_load = 0;
 458
 459 /*
 460  * Driver major number, defaults to zero to get auto
 461  * assigned major number. May be forced as module parameter.
 462  */
 463 static int ttymajor = 0;
 464
 465 /*
 466  * Array of user specified options for ISA adapters.
 467  */
 468 static int debug_level = 0;
 469 static int maxframe[MAX_DEVICES] = {0,};
 470
 471 module_param(break_on_load, bool, 0);
 472 module_param(ttymajor, int, 0);
 473 module_param(debug_level, int, 0);
 474 module_param_array(maxframe, int, NULL, 0);
 475
 476 static char *driver_name = "SyncLink MultiPort driver";
 477 static char *driver_version = "$Revision: 4.38 $";
 478
 479 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
 480 static void synclinkmp_remove_one(struct pci_dev *dev);
 481
 482 static struct pci_device_id synclinkmp_pci_tbl[] = {
 483         { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
 484         { 0, }, /* terminate list */
 485 };
 486 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
 487
 488 MODULE_LICENSE("GPL");
 489
 490 static struct pci_driver synclinkmp_pci_driver = {
 491         .name           = "synclinkmp",
 492         .id_table       = synclinkmp_pci_tbl,
 493         .probe          = synclinkmp_init_one,
 494         .remove         = synclinkmp_remove_one,
 495 };
 496
 497
 498 static struct tty_driver *serial_driver;
 499
 500 /* number of characters left in xmit buffer before we ask for more */
 501 #define WAKEUP_CHARS 256
 502
 503
 504 /* tty callbacks */
 505
 506 static int  open(struct tty_struct *tty, struct file * filp);
 507 static void close(struct tty_struct *tty, struct file * filp);
 508 static void hangup(struct tty_struct *tty);
 509 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
 510
 511 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
 512 static int put_char(struct tty_struct *tty, unsigned char ch);
 513 static void send_xchar(struct tty_struct *tty, char ch);
 514 static void wait_until_sent(struct tty_struct *tty, int timeout);
 515 static int  write_room(struct tty_struct *tty);
 516 static void flush_chars(struct tty_struct *tty);
 517 static void flush_buffer(struct tty_struct *tty);
 518 static void tx_hold(struct tty_struct *tty);
 519 static void tx_release(struct tty_struct *tty);
 520
 521 static int  ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
 522 static int  chars_in_buffer(struct tty_struct *tty);
 523 static void throttle(struct tty_struct * tty);
 524 static void unthrottle(struct tty_struct * tty);
 525 static int set_break(struct tty_struct *tty, int break_state);
 526
 527 #if SYNCLINK_GENERIC_HDLC
 528 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 529 static void hdlcdev_tx_done(SLMP_INFO *info);
 530 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
 531 static int  hdlcdev_init(SLMP_INFO *info);
 532 static void hdlcdev_exit(SLMP_INFO *info);
 533 #endif
 534
 535 /* ioctl handlers */
 536
 537 static int  get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
 538 static int  get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 539 static int  set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 540 static int  get_txidle(SLMP_INFO *info, int __user *idle_mode);
 541 static int  set_txidle(SLMP_INFO *info, int idle_mode);
 542 static int  tx_enable(SLMP_INFO *info, int enable);
 543 static int  tx_abort(SLMP_INFO *info);
 544 static int  rx_enable(SLMP_INFO *info, int enable);
 545 static int  modem_input_wait(SLMP_INFO *info,int arg);
 546 static int  wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
 547 static int  tiocmget(struct tty_struct *tty);
 548 static int  tiocmset(struct tty_struct *tty,
 549                         unsigned int set, unsigned int clear);
 550 static int  set_break(struct tty_struct *tty, int break_state);
 551
 552 static void add_device(SLMP_INFO *info);
 553 static void device_init(int adapter_num, struct pci_dev *pdev);
 554 static int  claim_resources(SLMP_INFO *info);
 555 static void release_resources(SLMP_INFO *info);
 556
 557 static int  startup(SLMP_INFO *info);
 558 static int  block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
 559 static int carrier_raised(struct tty_port *port);
 560 static void shutdown(SLMP_INFO *info);
 561 static void program_hw(SLMP_INFO *info);
 562 static void change_params(SLMP_INFO *info);
 563
 564 static bool init_adapter(SLMP_INFO *info);
 565 static bool register_test(SLMP_INFO *info);
 566 static bool irq_test(SLMP_INFO *info);
 567 static bool loopback_test(SLMP_INFO *info);
 568 static int  adapter_test(SLMP_INFO *info);
 569 static bool memory_test(SLMP_INFO *info);
 570
 571 static void reset_adapter(SLMP_INFO *info);
 572 static void reset_port(SLMP_INFO *info);
 573 static void async_mode(SLMP_INFO *info);
 574 static void hdlc_mode(SLMP_INFO *info);
 575
 576 static void rx_stop(SLMP_INFO *info);
 577 static void rx_start(SLMP_INFO *info);
 578 static void rx_reset_buffers(SLMP_INFO *info);
 579 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
 580 static bool rx_get_frame(SLMP_INFO *info);
 581
 582 static void tx_start(SLMP_INFO *info);
 583 static void tx_stop(SLMP_INFO *info);
 584 static void tx_load_fifo(SLMP_INFO *info);
 585 static void tx_set_idle(SLMP_INFO *info);
 586 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
 587
 588 static void get_signals(SLMP_INFO *info);
 589 static void set_signals(SLMP_INFO *info);
 590 static void enable_loopback(SLMP_INFO *info, int enable);
 591 static void set_rate(SLMP_INFO *info, u32 data_rate);
 592
 593 static int  bh_action(SLMP_INFO *info);
 594 static void bh_handler(struct work_struct *work);
 595 static void bh_receive(SLMP_INFO *info);
 596 static void bh_transmit(SLMP_INFO *info);
 597 static void bh_status(SLMP_INFO *info);
 598 static void isr_timer(SLMP_INFO *info);
 599 static void isr_rxint(SLMP_INFO *info);
 600 static void isr_rxrdy(SLMP_INFO *info);
 601 static void isr_txint(SLMP_INFO *info);
 602 static void isr_txrdy(SLMP_INFO *info);
 603 static void isr_rxdmaok(SLMP_INFO *info);
 604 static void isr_rxdmaerror(SLMP_INFO *info);
 605 static void isr_txdmaok(SLMP_INFO *info);
 606 static void isr_txdmaerror(SLMP_INFO *info);
 607 static void isr_io_pin(SLMP_INFO *info, u16 status);
 608
 609 static int  alloc_dma_bufs(SLMP_INFO *info);
 610 static void free_dma_bufs(SLMP_INFO *info);
 611 static int  alloc_buf_list(SLMP_INFO *info);
 612 static int  alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
 613 static int  alloc_tmp_rx_buf(SLMP_INFO *info);
 614 static void free_tmp_rx_buf(SLMP_INFO *info);
 615
 616 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
 617 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
 618 static void tx_timeout(unsigned long context);
 619 static void status_timeout(unsigned long context);
 620
 621 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
 622 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
 623 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
 624 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
 625 static unsigned char read_status_reg(SLMP_INFO * info);
 626 static void write_control_reg(SLMP_INFO * info);
 627
 628
 629 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
 630 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
 631 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
 632
 633 static u32 misc_ctrl_value = 0x007e4040;
 634 static u32 lcr1_brdr_value = 0x00800028;
 635
 636 static u32 read_ahead_count = 8;
 637
 638 /* DPCR, DMA Priority Control
 639  *
 640  * 07..05  Not used, must be 0
 641  * 04      BRC, bus release condition: 0=all transfers complete
 642  *              1=release after 1 xfer on all channels
 643  * 03      CCC, channel change condition: 0=every cycle
 644  *              1=after each channel completes all xfers
 645  * 02..00  PR<2..0>, priority 100=round robin
 646  *
 647  * 00000100 = 0x00
 648  */
 649 static unsigned char dma_priority = 0x04;
 650
 651 // Number of bytes that can be written to shared RAM
 652 // in a single write operation
 653 static u32 sca_pci_load_interval = 64;
 654
 655 /*
 656  * 1st function defined in .text section. Calling this function in
 657  * init_module() followed by a breakpoint allows a remote debugger
 658  * (gdb) to get the .text address for the add-symbol-file command.
 659  * This allows remote debugging of dynamically loadable modules.
 660  */
 661 static void* synclinkmp_get_text_ptr(void);
 662 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
 663
 664 static inline int sanity_check(SLMP_INFO *info,
 665                                char *name, const char *routine)
 666 {
 667 #ifdef SANITY_CHECK
 668         static const char *badmagic =
 669                 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
 670         static const char *badinfo =
 671                 "Warning: null synclinkmp_struct for (%s) in %s\n";
 672
 673         if (!info) {
 674                 printk(badinfo, name, routine);
 675                 return 1;
 676         }
 677         if (info->magic != MGSL_MAGIC) {
 678                 printk(badmagic, name, routine);
 679                 return 1;
 680         }
 681 #else
 682         if (!info)
 683                 return 1;
 684 #endif
 685         return 0;
 686 }
 687
 688 /**
 689  * line discipline callback wrappers
 690  *
 691  * The wrappers maintain line discipline references
 692  * while calling into the line discipline.
 693  *
 694  * ldisc_receive_buf  - pass receive data to line discipline
 695  */
 696
 697 static void ldisc_receive_buf(struct tty_struct *tty,
 698                               const __u8 *data, char *flags, int count)
 699 {
 700         struct tty_ldisc *ld;
 701         if (!tty)
 702                 return;
 703         ld = tty_ldisc_ref(tty);
 704         if (ld) {
 705                 if (ld->ops->receive_buf)
 706                         ld->ops->receive_buf(tty, data, flags, count);
 707                 tty_ldisc_deref(ld);
 708         }
 709 }
 710
 711 /* tty callbacks */
 712
 713 static int install(struct tty_driver *driver, struct tty_struct *tty)
 714 {
 715         SLMP_INFO *info;
 716         int line = tty->index;
 717
 718         if (line >= synclinkmp_device_count) {
 719                 printk("%s(%d): open with invalid line #%d.\n",
 720                         __FILE__,__LINE__,line);
 721                 return -ENODEV;
 722         }
 723
 724         info = synclinkmp_device_list;
 725         while (info && info->line != line)
 726                 info = info->next_device;
 727         if (sanity_check(info, tty->name, "open"))
 728                 return -ENODEV;
 729         if (info->init_error) {
 730                 printk("%s(%d):%s device is not allocated, init error=%d\n",
 731                         __FILE__, __LINE__, info->device_name,
 732                         info->init_error);
 733                 return -ENODEV;
 734         }
 735
 736         tty->driver_data = info;
 737
 738         return tty_port_install(&info->port, driver, tty);
 739 }
 740
 741 /* Called when a port is opened.  Init and enable port.
 742  */
 743 static int open(struct tty_struct *tty, struct file *filp)
 744 {
 745         SLMP_INFO *info = tty->driver_data;
 746         unsigned long flags;
 747         int retval;
 748
 749         info->port.tty = tty;
 750
 751         if (debug_level >= DEBUG_LEVEL_INFO)
 752                 printk("%s(%d):%s open(), old ref count = %d\n",
 753                          __FILE__,__LINE__,tty->driver->name, info->port.count);
 754
 755         info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 756
 757         spin_lock_irqsave(&info->netlock, flags);
 758         if (info->netcount) {
 759                 retval = -EBUSY;
 760                 spin_unlock_irqrestore(&info->netlock, flags);
 761                 goto cleanup;
 762         }
 763         info->port.count++;
 764         spin_unlock_irqrestore(&info->netlock, flags);
 765
 766         if (info->port.count == 1) {
 767                 /* 1st open on this device, init hardware */
 768                 retval = startup(info);
 769                 if (retval < 0)
 770                         goto cleanup;
 771         }
 772
 773         retval = block_til_ready(tty, filp, info);
 774         if (retval) {
 775                 if (debug_level >= DEBUG_LEVEL_INFO)
 776                         printk("%s(%d):%s block_til_ready() returned %d\n",
 777                                  __FILE__,__LINE__, info->device_name, retval);
 778                 goto cleanup;
 779         }
 780
 781         if (debug_level >= DEBUG_LEVEL_INFO)
 782                 printk("%s(%d):%s open() success\n",
 783                          __FILE__,__LINE__, info->device_name);
 784         retval = 0;
 785
 786 cleanup:
 787         if (retval) {
 788                 if (tty->count == 1)
 789                         info->port.tty = NULL; /* tty layer will release tty struct */
 790                 if(info->port.count)
 791                         info->port.count--;
 792         }
 793
 794         return retval;
 795 }
 796
 797 /* Called when port is closed. Wait for remaining data to be
 798  * sent. Disable port and free resources.
 799  */
 800 static void close(struct tty_struct *tty, struct file *filp)
 801 {
 802         SLMP_INFO * info = tty->driver_data;
 803
 804         if (sanity_check(info, tty->name, "close"))
 805                 return;
 806
 807         if (debug_level >= DEBUG_LEVEL_INFO)
 808                 printk("%s(%d):%s close() entry, count=%d\n",
 809                          __FILE__,__LINE__, info->device_name, info->port.count);
 810
 811         if (tty_port_close_start(&info->port, tty, filp) == 0)
 812                 goto cleanup;
 813
 814         mutex_lock(&info->port.mutex);
 815         if (info->port.flags & ASYNC_INITIALIZED)
 816                 wait_until_sent(tty, info->timeout);
 817
 818         flush_buffer(tty);
 819         tty_ldisc_flush(tty);
 820         shutdown(info);
 821         mutex_unlock(&info->port.mutex);
 822
 823         tty_port_close_end(&info->port, tty);
 824         info->port.tty = NULL;
 825 cleanup:
 826         if (debug_level >= DEBUG_LEVEL_INFO)
 827                 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
 828                         tty->driver->name, info->port.count);
 829 }
 830
 831 /* Called by tty_hangup() when a hangup is signaled.
 832  * This is the same as closing all open descriptors for the port.
 833  */
 834 static void hangup(struct tty_struct *tty)
 835 {
 836         SLMP_INFO *info = tty->driver_data;
 837         unsigned long flags;
 838
 839         if (debug_level >= DEBUG_LEVEL_INFO)
 840                 printk("%s(%d):%s hangup()\n",
 841                          __FILE__,__LINE__, info->device_name );
 842
 843         if (sanity_check(info, tty->name, "hangup"))
 844                 return;
 845
 846         mutex_lock(&info->port.mutex);
 847         flush_buffer(tty);
 848         shutdown(info);
 849
 850         spin_lock_irqsave(&info->port.lock, flags);
 851         info->port.count = 0;
 852         info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
 853         info->port.tty = NULL;
 854         spin_unlock_irqrestore(&info->port.lock, flags);
 855         mutex_unlock(&info->port.mutex);
 856
 857         wake_up_interruptible(&info->port.open_wait);
 858 }
 859
 860 /* Set new termios settings
 861  */
 862 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 863 {
 864         SLMP_INFO *info = tty->driver_data;
 865         unsigned long flags;
 866
 867         if (debug_level >= DEBUG_LEVEL_INFO)
 868                 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
 869                         tty->driver->name );
 870
 871         change_params(info);
 872
 873         /* Handle transition to B0 status */
 874         if (old_termios->c_cflag & CBAUD &&
 875             !(tty->termios.c_cflag & CBAUD)) {
 876                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
 877                 spin_lock_irqsave(&info->lock,flags);
 878                 set_signals(info);
 879                 spin_unlock_irqrestore(&info->lock,flags);
 880         }
 881
 882         /* Handle transition away from B0 status */
 883         if (!(old_termios->c_cflag & CBAUD) &&
 884             tty->termios.c_cflag & CBAUD) {
 885                 info->serial_signals |= SerialSignal_DTR;
 886                 if (!(tty->termios.c_cflag & CRTSCTS) ||
 887                     !test_bit(TTY_THROTTLED, &tty->flags)) {
 888                         info->serial_signals |= SerialSignal_RTS;
 889                 }
 890                 spin_lock_irqsave(&info->lock,flags);
 891                 set_signals(info);
 892                 spin_unlock_irqrestore(&info->lock,flags);
 893         }
 894
 895         /* Handle turning off CRTSCTS */
 896         if (old_termios->c_cflag & CRTSCTS &&
 897             !(tty->termios.c_cflag & CRTSCTS)) {
 898                 tty->hw_stopped = 0;
 899                 tx_release(tty);
 900         }
 901 }
 902
 903 /* Send a block of data
 904  *
 905  * Arguments:
 906  *
 907  *      tty             pointer to tty information structure
 908  *      buf             pointer to buffer containing send data
 909  *      count           size of send data in bytes
 910  *
 911  * Return Value:        number of characters written
 912  */
 913 static int write(struct tty_struct *tty,
 914                  const unsigned char *buf, int count)
 915 {
 916         int     c, ret = 0;
 917         SLMP_INFO *info = tty->driver_data;
 918         unsigned long flags;
 919
 920         if (debug_level >= DEBUG_LEVEL_INFO)
 921                 printk("%s(%d):%s write() count=%d\n",
 922                        __FILE__,__LINE__,info->device_name,count);
 923
 924         if (sanity_check(info, tty->name, "write"))
 925                 goto cleanup;
 926
 927         if (!info->tx_buf)
 928                 goto cleanup;
 929
 930         if (info->params.mode == MGSL_MODE_HDLC) {
 931                 if (count > info->max_frame_size) {
 932                         ret = -EIO;
 933                         goto cleanup;
 934                 }
 935                 if (info->tx_active)
 936                         goto cleanup;
 937                 if (info->tx_count) {
 938                         /* send accumulated data from send_char() calls */
 939                         /* as frame and wait before accepting more data. */
 940                         tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
 941                         goto start;
 942                 }
 943                 ret = info->tx_count = count;
 944                 tx_load_dma_buffer(info, buf, count);
 945                 goto start;
 946         }
 947
 948         for (;;) {
 949                 c = min_t(int, count,
 950                         min(info->max_frame_size - info->tx_count - 1,
 951                             info->max_frame_size - info->tx_put));
 952                 if (c <= 0)
 953                         break;
 954
 955                 memcpy(info->tx_buf + info->tx_put, buf, c);
 956
 957                 spin_lock_irqsave(&info->lock,flags);
 958                 info->tx_put += c;
 959                 if (info->tx_put >= info->max_frame_size)
 960                         info->tx_put -= info->max_frame_size;
 961                 info->tx_count += c;
 962                 spin_unlock_irqrestore(&info->lock,flags);
 963
 964                 buf += c;
 965                 count -= c;
 966                 ret += c;
 967         }
 968
 969         if (info->params.mode == MGSL_MODE_HDLC) {
 970                 if (count) {
 971                         ret = info->tx_count = 0;
 972                         goto cleanup;
 973                 }
 974                 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
 975         }
 976 start:
 977         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
 978                 spin_lock_irqsave(&info->lock,flags);
 979                 if (!info->tx_active)
 980                         tx_start(info);
 981                 spin_unlock_irqrestore(&info->lock,flags);
 982         }
 983
 984 cleanup:
 985         if (debug_level >= DEBUG_LEVEL_INFO)
 986                 printk( "%s(%d):%s write() returning=%d\n",
 987                         __FILE__,__LINE__,info->device_name,ret);
 988         return ret;
 989 }
 990
 991 /* Add a character to the transmit buffer.
 992  */
 993 static int put_char(struct tty_struct *tty, unsigned char ch)
 994 {
 995         SLMP_INFO *info = tty->driver_data;
 996         unsigned long flags;
 997         int ret = 0;
 998
 999         if ( debug_level >= DEBUG_LEVEL_INFO ) {
1000                 printk( "%s(%d):%s put_char(%d)\n",
1001                         __FILE__,__LINE__,info->device_name,ch);
1002         }
1003
1004         if (sanity_check(info, tty->name, "put_char"))
1005                 return 0;
1006
1007         if (!info->tx_buf)
1008                 return 0;
1009
1010         spin_lock_irqsave(&info->lock,flags);
1011
1012         if ( (info->params.mode != MGSL_MODE_HDLC) ||
1013              !info->tx_active ) {
1014
1015                 if (info->tx_count < info->max_frame_size - 1) {
1016                         info->tx_buf[info->tx_put++] = ch;
1017                         if (info->tx_put >= info->max_frame_size)
1018                                 info->tx_put -= info->max_frame_size;
1019                         info->tx_count++;
1020                         ret = 1;
1021                 }
1022         }
1023
1024         spin_unlock_irqrestore(&info->lock,flags);
1025         return ret;
1026 }
1027
1028 /* Send a high-priority XON/XOFF character
1029  */
1030 static void send_xchar(struct tty_struct *tty, char ch)
1031 {
1032         SLMP_INFO *info = tty->driver_data;
1033         unsigned long flags;
1034
1035         if (debug_level >= DEBUG_LEVEL_INFO)
1036                 printk("%s(%d):%s send_xchar(%d)\n",
1037                          __FILE__,__LINE__, info->device_name, ch );
1038
1039         if (sanity_check(info, tty->name, "send_xchar"))
1040                 return;
1041
1042         info->x_char = ch;
1043         if (ch) {
1044                 /* Make sure transmit interrupts are on */
1045                 spin_lock_irqsave(&info->lock,flags);
1046                 if (!info->tx_enabled)
1047                         tx_start(info);
1048                 spin_unlock_irqrestore(&info->lock,flags);
1049         }
1050 }
1051
1052 /* Wait until the transmitter is empty.
1053  */
1054 static void wait_until_sent(struct tty_struct *tty, int timeout)
1055 {
1056         SLMP_INFO * info = tty->driver_data;
1057         unsigned long orig_jiffies, char_time;
1058
1059         if (!info )
1060                 return;
1061
1062         if (debug_level >= DEBUG_LEVEL_INFO)
1063                 printk("%s(%d):%s wait_until_sent() entry\n",
1064                          __FILE__,__LINE__, info->device_name );
1065
1066         if (sanity_check(info, tty->name, "wait_until_sent"))
1067                 return;
1068
1069         if (!test_bit(ASYNCB_INITIALIZED, &info->port.flags))
1070                 goto exit;
1071
1072         orig_jiffies = jiffies;
1073
1074         /* Set check interval to 1/5 of estimated time to
1075          * send a character, and make it at least 1. The check
1076          * interval should also be less than the timeout.
1077          * Note: use tight timings here to satisfy the NIST-PCTS.
1078          */
1079
1080         if ( info->params.data_rate ) {
1081                 char_time = info->timeout/(32 * 5);
1082                 if (!char_time)
1083                         char_time++;
1084         } else
1085                 char_time = 1;
1086
1087         if (timeout)
1088                 char_time = min_t(unsigned long, char_time, timeout);
1089
1090         if ( info->params.mode == MGSL_MODE_HDLC ) {
1091                 while (info->tx_active) {
1092                         msleep_interruptible(jiffies_to_msecs(char_time));
1093                         if (signal_pending(current))
1094                                 break;
1095                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1096                                 break;
1097                 }
1098         } else {
1099                 /*
1100                  * TODO: determine if there is something similar to USC16C32
1101                  *       TXSTATUS_ALL_SENT status
1102                  */
1103                 while ( info->tx_active && info->tx_enabled) {
1104                         msleep_interruptible(jiffies_to_msecs(char_time));
1105                         if (signal_pending(current))
1106                                 break;
1107                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1108                                 break;
1109                 }
1110         }
1111
1112 exit:
1113         if (debug_level >= DEBUG_LEVEL_INFO)
1114                 printk("%s(%d):%s wait_until_sent() exit\n",
1115                          __FILE__,__LINE__, info->device_name );
1116 }
1117
1118 /* Return the count of free bytes in transmit buffer
1119  */
1120 static int write_room(struct tty_struct *tty)
1121 {
1122         SLMP_INFO *info = tty->driver_data;
1123         int ret;
1124
1125         if (sanity_check(info, tty->name, "write_room"))
1126                 return 0;
1127
1128         if (info->params.mode == MGSL_MODE_HDLC) {
1129                 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1130         } else {
1131                 ret = info->max_frame_size - info->tx_count - 1;
1132                 if (ret < 0)
1133                         ret = 0;
1134         }
1135
1136         if (debug_level >= DEBUG_LEVEL_INFO)
1137                 printk("%s(%d):%s write_room()=%d\n",
1138                        __FILE__, __LINE__, info->device_name, ret);
1139
1140         return ret;
1141 }
1142
1143 /* enable transmitter and send remaining buffered characters
1144  */
1145 static void flush_chars(struct tty_struct *tty)
1146 {
1147         SLMP_INFO *info = tty->driver_data;
1148         unsigned long flags;
1149
1150         if ( debug_level >= DEBUG_LEVEL_INFO )
1151                 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1152                         __FILE__,__LINE__,info->device_name,info->tx_count);
1153
1154         if (sanity_check(info, tty->name, "flush_chars"))
1155                 return;
1156
1157         if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1158             !info->tx_buf)
1159                 return;
1160
1161         if ( debug_level >= DEBUG_LEVEL_INFO )
1162                 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1163                         __FILE__,__LINE__,info->device_name );
1164
1165         spin_lock_irqsave(&info->lock,flags);
1166
1167         if (!info->tx_active) {
1168                 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1169                         info->tx_count ) {
1170                         /* operating in synchronous (frame oriented) mode */
1171                         /* copy data from circular tx_buf to */
1172                         /* transmit DMA buffer. */
1173                         tx_load_dma_buffer(info,
1174                                  info->tx_buf,info->tx_count);
1175                 }
1176                 tx_start(info);
1177         }
1178
1179         spin_unlock_irqrestore(&info->lock,flags);
1180 }
1181
1182 /* Discard all data in the send buffer
1183  */
1184 static void flush_buffer(struct tty_struct *tty)
1185 {
1186         SLMP_INFO *info = tty->driver_data;
1187         unsigned long flags;
1188
1189         if (debug_level >= DEBUG_LEVEL_INFO)
1190                 printk("%s(%d):%s flush_buffer() entry\n",
1191                          __FILE__,__LINE__, info->device_name );
1192
1193         if (sanity_check(info, tty->name, "flush_buffer"))
1194                 return;
1195
1196         spin_lock_irqsave(&info->lock,flags);
1197         info->tx_count = info->tx_put = info->tx_get = 0;
1198         del_timer(&info->tx_timer);
1199         spin_unlock_irqrestore(&info->lock,flags);
1200
1201         tty_wakeup(tty);
1202 }
1203
1204 /* throttle (stop) transmitter
1205  */
1206 static void tx_hold(struct tty_struct *tty)
1207 {
1208         SLMP_INFO *info = tty->driver_data;
1209         unsigned long flags;
1210
1211         if (sanity_check(info, tty->name, "tx_hold"))
1212                 return;
1213
1214         if ( debug_level >= DEBUG_LEVEL_INFO )
1215                 printk("%s(%d):%s tx_hold()\n",
1216                         __FILE__,__LINE__,info->device_name);
1217
1218         spin_lock_irqsave(&info->lock,flags);
1219         if (info->tx_enabled)
1220                 tx_stop(info);
1221         spin_unlock_irqrestore(&info->lock,flags);
1222 }
1223
1224 /* release (start) transmitter
1225  */
1226 static void tx_release(struct tty_struct *tty)
1227 {
1228         SLMP_INFO *info = tty->driver_data;
1229         unsigned long flags;
1230
1231         if (sanity_check(info, tty->name, "tx_release"))
1232                 return;
1233
1234         if ( debug_level >= DEBUG_LEVEL_INFO )
1235                 printk("%s(%d):%s tx_release()\n",
1236                         __FILE__,__LINE__,info->device_name);
1237
1238         spin_lock_irqsave(&info->lock,flags);
1239         if (!info->tx_enabled)
1240                 tx_start(info);
1241         spin_unlock_irqrestore(&info->lock,flags);
1242 }
1243
1244 /* Service an IOCTL request
1245  *
1246  * Arguments:
1247  *
1248  *      tty     pointer to tty instance data
1249  *      cmd     IOCTL command code
1250  *      arg     command argument/context
1251  *
1252  * Return Value:        0 if success, otherwise error code
1253  */
1254 static int ioctl(struct tty_struct *tty,
1255                  unsigned int cmd, unsigned long arg)
1256 {
1257         SLMP_INFO *info = tty->driver_data;
1258         void __user *argp = (void __user *)arg;
1259
1260         if (debug_level >= DEBUG_LEVEL_INFO)
1261                 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1262                         info->device_name, cmd );
1263
1264         if (sanity_check(info, tty->name, "ioctl"))
1265                 return -ENODEV;
1266
1267         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1268             (cmd != TIOCMIWAIT)) {
1269                 if (tty->flags & (1 << TTY_IO_ERROR))
1270                     return -EIO;
1271         }
1272
1273         switch (cmd) {
1274         case MGSL_IOCGPARAMS:
1275                 return get_params(info, argp);
1276         case MGSL_IOCSPARAMS:
1277                 return set_params(info, argp);
1278         case MGSL_IOCGTXIDLE:
1279                 return get_txidle(info, argp);
1280         case MGSL_IOCSTXIDLE:
1281                 return set_txidle(info, (int)arg);
1282         case MGSL_IOCTXENABLE:
1283                 return tx_enable(info, (int)arg);
1284         case MGSL_IOCRXENABLE:
1285                 return rx_enable(info, (int)arg);
1286         case MGSL_IOCTXABORT:
1287                 return tx_abort(info);
1288         case MGSL_IOCGSTATS:
1289                 return get_stats(info, argp);
1290         case MGSL_IOCWAITEVENT:
1291                 return wait_mgsl_event(info, argp);
1292         case MGSL_IOCLOOPTXDONE:
1293                 return 0; // TODO: Not supported, need to document
1294                 /* Wait for modem input (DCD,RI,DSR,CTS) change
1295                  * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1296                  */
1297         case TIOCMIWAIT:
1298                 return modem_input_wait(info,(int)arg);
1299
1300                 /*
1301                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1302                  * Return: write counters to the user passed counter struct
1303                  * NB: both 1->0 and 0->1 transitions are counted except for
1304                  *     RI where only 0->1 is counted.
1305                  */
1306         default:
1307                 return -ENOIOCTLCMD;
1308         }
1309         return 0;
1310 }
1311
1312 static int get_icount(struct tty_struct *tty,
1313                                 struct serial_icounter_struct *icount)
1314 {
1315         SLMP_INFO *info = tty->driver_data;
1316         struct mgsl_icount cnow;        /* kernel counter temps */
1317         unsigned long flags;
1318
1319         spin_lock_irqsave(&info->lock,flags);
1320         cnow = info->icount;
1321         spin_unlock_irqrestore(&info->lock,flags);
1322
1323         icount->cts = cnow.cts;
1324         icount->dsr = cnow.dsr;
1325         icount->rng = cnow.rng;
1326         icount->dcd = cnow.dcd;
1327         icount->rx = cnow.rx;
1328         icount->tx = cnow.tx;
1329         icount->frame = cnow.frame;
1330         icount->overrun = cnow.overrun;
1331         icount->parity = cnow.parity;
1332         icount->brk = cnow.brk;
1333         icount->buf_overrun = cnow.buf_overrun;
1334
1335         return 0;
1336 }
1337
1338 /*
1339  * /proc fs routines....
1340  */
1341
1342 static inline void line_info(struct seq_file *m, SLMP_INFO *info)
1343 {
1344         char    stat_buf[30];
1345         unsigned long flags;
1346
1347         seq_printf(m, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1348                        "\tIRQ=%d MaxFrameSize=%u\n",
1349                 info->device_name,
1350                 info->phys_sca_base,
1351                 info->phys_memory_base,
1352                 info->phys_statctrl_base,
1353                 info->phys_lcr_base,
1354                 info->irq_level,
1355                 info->max_frame_size );
1356
1357         /* output current serial signal states */
1358         spin_lock_irqsave(&info->lock,flags);
1359         get_signals(info);
1360         spin_unlock_irqrestore(&info->lock,flags);
1361
1362         stat_buf[0] = 0;
1363         stat_buf[1] = 0;
1364         if (info->serial_signals & SerialSignal_RTS)
1365                 strcat(stat_buf, "|RTS");
1366         if (info->serial_signals & SerialSignal_CTS)
1367                 strcat(stat_buf, "|CTS");
1368         if (info->serial_signals & SerialSignal_DTR)
1369                 strcat(stat_buf, "|DTR");
1370         if (info->serial_signals & SerialSignal_DSR)
1371                 strcat(stat_buf, "|DSR");
1372         if (info->serial_signals & SerialSignal_DCD)
1373                 strcat(stat_buf, "|CD");
1374         if (info->serial_signals & SerialSignal_RI)
1375                 strcat(stat_buf, "|RI");
1376
1377         if (info->params.mode == MGSL_MODE_HDLC) {
1378                 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1379                               info->icount.txok, info->icount.rxok);
1380                 if (info->icount.txunder)
1381                         seq_printf(m, " txunder:%d", info->icount.txunder);
1382                 if (info->icount.txabort)
1383                         seq_printf(m, " txabort:%d", info->icount.txabort);
1384                 if (info->icount.rxshort)
1385                         seq_printf(m, " rxshort:%d", info->icount.rxshort);
1386                 if (info->icount.rxlong)
1387                         seq_printf(m, " rxlong:%d", info->icount.rxlong);
1388                 if (info->icount.rxover)
1389                         seq_printf(m, " rxover:%d", info->icount.rxover);
1390                 if (info->icount.rxcrc)
1391                         seq_printf(m, " rxlong:%d", info->icount.rxcrc);
1392         } else {
1393                 seq_printf(m, "\tASYNC tx:%d rx:%d",
1394                               info->icount.tx, info->icount.rx);
1395                 if (info->icount.frame)
1396                         seq_printf(m, " fe:%d", info->icount.frame);
1397                 if (info->icount.parity)
1398                         seq_printf(m, " pe:%d", info->icount.parity);
1399                 if (info->icount.brk)
1400                         seq_printf(m, " brk:%d", info->icount.brk);
1401                 if (info->icount.overrun)
1402                         seq_printf(m, " oe:%d", info->icount.overrun);
1403         }
1404
1405         /* Append serial signal status to end */
1406         seq_printf(m, " %s\n", stat_buf+1);
1407
1408         seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1409          info->tx_active,info->bh_requested,info->bh_running,
1410          info->pending_bh);
1411 }
1412
1413 /* Called to print information about devices
1414  */
1415 static int synclinkmp_proc_show(struct seq_file *m, void *v)
1416 {
1417         SLMP_INFO *info;
1418
1419         seq_printf(m, "synclinkmp driver:%s\n", driver_version);
1420
1421         info = synclinkmp_device_list;
1422         while( info ) {
1423                 line_info(m, info);
1424                 info = info->next_device;
1425         }
1426         return 0;
1427 }
1428
1429 static int synclinkmp_proc_open(struct inode *inode, struct file *file)
1430 {
1431         return single_open(file, synclinkmp_proc_show, NULL);
1432 }
1433
1434 static const struct file_operations synclinkmp_proc_fops = {
1435         .owner          = THIS_MODULE,
1436         .open           = synclinkmp_proc_open,
1437         .read           = seq_read,
1438         .llseek         = seq_lseek,
1439         .release        = single_release,
1440 };
1441
1442 /* Return the count of bytes in transmit buffer
1443  */
1444 static int chars_in_buffer(struct tty_struct *tty)
1445 {
1446         SLMP_INFO *info = tty->driver_data;
1447
1448         if (sanity_check(info, tty->name, "chars_in_buffer"))
1449                 return 0;
1450
1451         if (debug_level >= DEBUG_LEVEL_INFO)
1452                 printk("%s(%d):%s chars_in_buffer()=%d\n",
1453                        __FILE__, __LINE__, info->device_name, info->tx_count);
1454
1455         return info->tx_count;
1456 }
1457
1458 /* Signal remote device to throttle send data (our receive data)
1459  */
1460 static void throttle(struct tty_struct * tty)
1461 {
1462         SLMP_INFO *info = tty->driver_data;
1463         unsigned long flags;
1464
1465         if (debug_level >= DEBUG_LEVEL_INFO)
1466                 printk("%s(%d):%s throttle() entry\n",
1467                          __FILE__,__LINE__, info->device_name );
1468
1469         if (sanity_check(info, tty->name, "throttle"))
1470                 return;
1471
1472         if (I_IXOFF(tty))
1473                 send_xchar(tty, STOP_CHAR(tty));
1474
1475         if (tty->termios.c_cflag & CRTSCTS) {
1476                 spin_lock_irqsave(&info->lock,flags);
1477                 info->serial_signals &= ~SerialSignal_RTS;
1478                 set_signals(info);
1479                 spin_unlock_irqrestore(&info->lock,flags);
1480         }
1481 }
1482
1483 /* Signal remote device to stop throttling send data (our receive data)
1484  */
1485 static void unthrottle(struct tty_struct * tty)
1486 {
1487         SLMP_INFO *info = tty->driver_data;
1488         unsigned long flags;
1489
1490         if (debug_level >= DEBUG_LEVEL_INFO)
1491                 printk("%s(%d):%s unthrottle() entry\n",
1492                          __FILE__,__LINE__, info->device_name );
1493
1494         if (sanity_check(info, tty->name, "unthrottle"))
1495                 return;
1496
1497         if (I_IXOFF(tty)) {
1498                 if (info->x_char)
1499                         info->x_char = 0;
1500                 else
1501                         send_xchar(tty, START_CHAR(tty));
1502         }
1503
1504         if (tty->termios.c_cflag & CRTSCTS) {
1505                 spin_lock_irqsave(&info->lock,flags);
1506                 info->serial_signals |= SerialSignal_RTS;
1507                 set_signals(info);
1508                 spin_unlock_irqrestore(&info->lock,flags);
1509         }
1510 }
1511
1512 /* set or clear transmit break condition
1513  * break_state  -1=set break condition, 0=clear
1514  */
1515 static int set_break(struct tty_struct *tty, int break_state)
1516 {
1517         unsigned char RegValue;
1518         SLMP_INFO * info = tty->driver_data;
1519         unsigned long flags;
1520
1521         if (debug_level >= DEBUG_LEVEL_INFO)
1522                 printk("%s(%d):%s set_break(%d)\n",
1523                          __FILE__,__LINE__, info->device_name, break_state);
1524
1525         if (sanity_check(info, tty->name, "set_break"))
1526                 return -EINVAL;
1527
1528         spin_lock_irqsave(&info->lock,flags);
1529         RegValue = read_reg(info, CTL);
1530         if (break_state == -1)
1531                 RegValue |= BIT3;
1532         else
1533                 RegValue &= ~BIT3;
1534         write_reg(info, CTL, RegValue);
1535         spin_unlock_irqrestore(&info->lock,flags);
1536         return 0;
1537 }
1538
1539 #if SYNCLINK_GENERIC_HDLC
1540
1541 /**
1542  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1543  * set encoding and frame check sequence (FCS) options
1544  *
1545  * dev       pointer to network device structure
1546  * encoding  serial encoding setting
1547  * parity    FCS setting
1548  *
1549  * returns 0 if success, otherwise error code
1550  */
1551 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1552                           unsigned short parity)
1553 {
1554         SLMP_INFO *info = dev_to_port(dev);
1555         unsigned char  new_encoding;
1556         unsigned short new_crctype;
1557
1558         /* return error if TTY interface open */
1559         if (info->port.count)
1560                 return -EBUSY;
1561
1562         switch (encoding)
1563         {
1564         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1565         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1566         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1567         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1568         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1569         default: return -EINVAL;
1570         }
1571
1572         switch (parity)
1573         {
1574         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1575         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1576         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1577         default: return -EINVAL;
1578         }
1579
1580         info->params.encoding = new_encoding;
1581         info->params.crc_type = new_crctype;
1582
1583         /* if network interface up, reprogram hardware */
1584         if (info->netcount)
1585                 program_hw(info);
1586
1587         return 0;
1588 }
1589
1590 /**
1591  * called by generic HDLC layer to send frame
1592  *
1593  * skb  socket buffer containing HDLC frame
1594  * dev  pointer to network device structure
1595  */
1596 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1597                                       struct net_device *dev)
1598 {
1599         SLMP_INFO *info = dev_to_port(dev);
1600         unsigned long flags;
1601
1602         if (debug_level >= DEBUG_LEVEL_INFO)
1603                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1604
1605         /* stop sending until this frame completes */
1606         netif_stop_queue(dev);
1607
1608         /* copy data to device buffers */
1609         info->tx_count = skb->len;
1610         tx_load_dma_buffer(info, skb->data, skb->len);
1611
1612         /* update network statistics */
1613         dev->stats.tx_packets++;
1614         dev->stats.tx_bytes += skb->len;
1615
1616         /* done with socket buffer, so free it */
1617         dev_kfree_skb(skb);
1618
1619         /* save start time for transmit timeout detection */
1620         dev->trans_start = jiffies;
1621
1622         /* start hardware transmitter if necessary */
1623         spin_lock_irqsave(&info->lock,flags);
1624         if (!info->tx_active)
1625                 tx_start(info);
1626         spin_unlock_irqrestore(&info->lock,flags);
1627
1628         return NETDEV_TX_OK;
1629 }
1630
1631 /**
1632  * called by network layer when interface enabled
1633  * claim resources and initialize hardware
1634  *
1635  * dev  pointer to network device structure
1636  *
1637  * returns 0 if success, otherwise error code
1638  */
1639 static int hdlcdev_open(struct net_device *dev)
1640 {
1641         SLMP_INFO *info = dev_to_port(dev);
1642         int rc;
1643         unsigned long flags;
1644
1645         if (debug_level >= DEBUG_LEVEL_INFO)
1646                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1647
1648         /* generic HDLC layer open processing */
1649         rc = hdlc_open(dev);
1650         if (rc)
1651                 return rc;
1652
1653         /* arbitrate between network and tty opens */
1654         spin_lock_irqsave(&info->netlock, flags);
1655         if (info->port.count != 0 || info->netcount != 0) {
1656                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1657                 spin_unlock_irqrestore(&info->netlock, flags);
1658                 return -EBUSY;
1659         }
1660         info->netcount=1;
1661         spin_unlock_irqrestore(&info->netlock, flags);
1662
1663         /* claim resources and init adapter */
1664         if ((rc = startup(info)) != 0) {
1665                 spin_lock_irqsave(&info->netlock, flags);
1666                 info->netcount=0;
1667                 spin_unlock_irqrestore(&info->netlock, flags);
1668                 return rc;
1669         }
1670
1671         /* assert RTS and DTR, apply hardware settings */
1672         info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
1673         program_hw(info);
1674
1675         /* enable network layer transmit */
1676         dev->trans_start = jiffies;
1677         netif_start_queue(dev);
1678
1679         /* inform generic HDLC layer of current DCD status */
1680         spin_lock_irqsave(&info->lock, flags);
1681         get_signals(info);
1682         spin_unlock_irqrestore(&info->lock, flags);
1683         if (info->serial_signals & SerialSignal_DCD)
1684                 netif_carrier_on(dev);
1685         else
1686                 netif_carrier_off(dev);
1687         return 0;
1688 }
1689
1690 /**
1691  * called by network layer when interface is disabled
1692  * shutdown hardware and release resources
1693  *
1694  * dev  pointer to network device structure
1695  *
1696  * returns 0 if success, otherwise error code
1697  */
1698 static int hdlcdev_close(struct net_device *dev)
1699 {
1700         SLMP_INFO *info = dev_to_port(dev);
1701         unsigned long flags;
1702
1703         if (debug_level >= DEBUG_LEVEL_INFO)
1704                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1705
1706         netif_stop_queue(dev);
1707
1708         /* shutdown adapter and release resources */
1709         shutdown(info);
1710
1711         hdlc_close(dev);
1712
1713         spin_lock_irqsave(&info->netlock, flags);
1714         info->netcount=0;
1715         spin_unlock_irqrestore(&info->netlock, flags);
1716
1717         return 0;
1718 }
1719
1720 /**
1721  * called by network layer to process IOCTL call to network device
1722  *
1723  * dev  pointer to network device structure
1724  * ifr  pointer to network interface request structure
1725  * cmd  IOCTL command code
1726  *
1727  * returns 0 if success, otherwise error code
1728  */
1729 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1730 {
1731         const size_t size = sizeof(sync_serial_settings);
1732         sync_serial_settings new_line;
1733         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1734         SLMP_INFO *info = dev_to_port(dev);
1735         unsigned int flags;
1736
1737         if (debug_level >= DEBUG_LEVEL_INFO)
1738                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1739
1740         /* return error if TTY interface open */
1741         if (info->port.count)
1742                 return -EBUSY;
1743
1744         if (cmd != SIOCWANDEV)
1745                 return hdlc_ioctl(dev, ifr, cmd);
1746
1747         switch(ifr->ifr_settings.type) {
1748         case IF_GET_IFACE: /* return current sync_serial_settings */
1749
1750                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1751                 if (ifr->ifr_settings.size < size) {
1752                         ifr->ifr_settings.size = size; /* data size wanted */
1753                         return -ENOBUFS;
1754                 }
1755
1756                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1757                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1758                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1759                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1760
1761                 memset(&new_line, 0, sizeof(new_line));
1762                 switch (flags){
1763                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1764                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1765                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1766                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1767                 default: new_line.clock_type = CLOCK_DEFAULT;
1768                 }
1769
1770                 new_line.clock_rate = info->params.clock_speed;
1771                 new_line.loopback   = info->params.loopback ? 1:0;
1772
1773                 if (copy_to_user(line, &new_line, size))
1774                         return -EFAULT;
1775                 return 0;
1776
1777         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1778
1779                 if(!capable(CAP_NET_ADMIN))
1780                         return -EPERM;
1781                 if (copy_from_user(&new_line, line, size))
1782                         return -EFAULT;
1783
1784                 switch (new_line.clock_type)
1785                 {
1786                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1787                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1788                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1789                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1790                 case CLOCK_DEFAULT:  flags = info->params.flags &
1791                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1792                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1793                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1794                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1795                 default: return -EINVAL;
1796                 }
1797
1798                 if (new_line.loopback != 0 && new_line.loopback != 1)
1799                         return -EINVAL;
1800
1801                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1802                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1803                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1804                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1805                 info->params.flags |= flags;
1806
1807                 info->params.loopback = new_line.loopback;
1808
1809                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1810                         info->params.clock_speed = new_line.clock_rate;
1811                 else
1812                         info->params.clock_speed = 0;
1813
1814                 /* if network interface up, reprogram hardware */
1815                 if (info->netcount)
1816                         program_hw(info);
1817                 return 0;
1818
1819         default:
1820                 return hdlc_ioctl(dev, ifr, cmd);
1821         }
1822 }
1823
1824 /**
1825  * called by network layer when transmit timeout is detected
1826  *
1827  * dev  pointer to network device structure
1828  */
1829 static void hdlcdev_tx_timeout(struct net_device *dev)
1830 {
1831         SLMP_INFO *info = dev_to_port(dev);
1832         unsigned long flags;
1833
1834         if (debug_level >= DEBUG_LEVEL_INFO)
1835                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1836
1837         dev->stats.tx_errors++;
1838         dev->stats.tx_aborted_errors++;
1839
1840         spin_lock_irqsave(&info->lock,flags);
1841         tx_stop(info);
1842         spin_unlock_irqrestore(&info->lock,flags);
1843
1844         netif_wake_queue(dev);
1845 }
1846
1847 /**
1848  * called by device driver when transmit completes
1849  * reenable network layer transmit if stopped
1850  *
1851  * info  pointer to device instance information
1852  */
1853 static void hdlcdev_tx_done(SLMP_INFO *info)
1854 {
1855         if (netif_queue_stopped(info->netdev))
1856                 netif_wake_queue(info->netdev);
1857 }
1858
1859 /**
1860  * called by device driver when frame received
1861  * pass frame to network layer
1862  *
1863  * info  pointer to device instance information
1864  * buf   pointer to buffer contianing frame data
1865  * size  count of data bytes in buf
1866  */
1867 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1868 {
1869         struct sk_buff *skb = dev_alloc_skb(size);
1870         struct net_device *dev = info->netdev;
1871
1872         if (debug_level >= DEBUG_LEVEL_INFO)
1873                 printk("hdlcdev_rx(%s)\n",dev->name);
1874
1875         if (skb == NULL) {
1876                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
1877                        dev->name);
1878                 dev->stats.rx_dropped++;
1879                 return;
1880         }
1881
1882         memcpy(skb_put(skb, size), buf, size);
1883
1884         skb->protocol = hdlc_type_trans(skb, dev);
1885
1886         dev->stats.rx_packets++;
1887         dev->stats.rx_bytes += size;
1888
1889         netif_rx(skb);
1890 }
1891
1892 static const struct net_device_ops hdlcdev_ops = {
1893         .ndo_open       = hdlcdev_open,
1894         .ndo_stop       = hdlcdev_close,
1895         .ndo_change_mtu = hdlc_change_mtu,
1896         .ndo_start_xmit = hdlc_start_xmit,
1897         .ndo_do_ioctl   = hdlcdev_ioctl,
1898         .ndo_tx_timeout = hdlcdev_tx_timeout,
1899 };
1900
1901 /**
1902  * called by device driver when adding device instance
1903  * do generic HDLC initialization
1904  *
1905  * info  pointer to device instance information
1906  *
1907  * returns 0 if success, otherwise error code
1908  */
1909 static int hdlcdev_init(SLMP_INFO *info)
1910 {
1911         int rc;
1912         struct net_device *dev;
1913         hdlc_device *hdlc;
1914
1915         /* allocate and initialize network and HDLC layer objects */
1916
1917         dev = alloc_hdlcdev(info);
1918         if (!dev) {
1919                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1920                 return -ENOMEM;
1921         }
1922
1923         /* for network layer reporting purposes only */
1924         dev->mem_start = info->phys_sca_base;
1925         dev->mem_end   = info->phys_sca_base + SCA_BASE_SIZE - 1;
1926         dev->irq       = info->irq_level;
1927
1928         /* network layer callbacks and settings */
1929         dev->netdev_ops     = &hdlcdev_ops;
1930         dev->watchdog_timeo = 10 * HZ;
1931         dev->tx_queue_len   = 50;
1932
1933         /* generic HDLC layer callbacks and settings */
1934         hdlc         = dev_to_hdlc(dev);
1935         hdlc->attach = hdlcdev_attach;
1936         hdlc->xmit   = hdlcdev_xmit;
1937
1938         /* register objects with HDLC layer */
1939         rc = register_hdlc_device(dev);
1940         if (rc) {
1941                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1942                 free_netdev(dev);
1943                 return rc;
1944         }
1945
1946         info->netdev = dev;
1947         return 0;
1948 }
1949
1950 /**
1951  * called by device driver when removing device instance
1952  * do generic HDLC cleanup
1953  *
1954  * info  pointer to device instance information
1955  */
1956 static void hdlcdev_exit(SLMP_INFO *info)
1957 {
1958         unregister_hdlc_device(info->netdev);
1959         free_netdev(info->netdev);
1960         info->netdev = NULL;
1961 }
1962
1963 #endif /* CONFIG_HDLC */
1964
1965
1966 /* Return next bottom half action to perform.
1967  * Return Value:        BH action code or 0 if nothing to do.
1968  */
1969 static int bh_action(SLMP_INFO *info)
1970 {
1971         unsigned long flags;
1972         int rc = 0;
1973
1974         spin_lock_irqsave(&info->lock,flags);
1975
1976         if (info->pending_bh & BH_RECEIVE) {
1977                 info->pending_bh &= ~BH_RECEIVE;
1978                 rc = BH_RECEIVE;
1979         } else if (info->pending_bh & BH_TRANSMIT) {
1980                 info->pending_bh &= ~BH_TRANSMIT;
1981                 rc = BH_TRANSMIT;
1982         } else if (info->pending_bh & BH_STATUS) {
1983                 info->pending_bh &= ~BH_STATUS;
1984                 rc = BH_STATUS;
1985         }
1986
1987         if (!rc) {
1988                 /* Mark BH routine as complete */
1989                 info->bh_running = false;
1990                 info->bh_requested = false;
1991         }
1992
1993         spin_unlock_irqrestore(&info->lock,flags);
1994
1995         return rc;
1996 }
1997
1998 /* Perform bottom half processing of work items queued by ISR.
1999  */
2000 static void bh_handler(struct work_struct *work)
2001 {
2002         SLMP_INFO *info = container_of(work, SLMP_INFO, task);
2003         int action;
2004
2005         if ( debug_level >= DEBUG_LEVEL_BH )
2006                 printk( "%s(%d):%s bh_handler() entry\n",
2007                         __FILE__,__LINE__,info->device_name);
2008
2009         info->bh_running = true;
2010
2011         while((action = bh_action(info)) != 0) {
2012
2013                 /* Process work item */
2014                 if ( debug_level >= DEBUG_LEVEL_BH )
2015                         printk( "%s(%d):%s bh_handler() work item action=%d\n",
2016                                 __FILE__,__LINE__,info->device_name, action);
2017
2018                 switch (action) {
2019
2020                 case BH_RECEIVE:
2021                         bh_receive(info);
2022                         break;
2023                 case BH_TRANSMIT:
2024                         bh_transmit(info);
2025                         break;
2026                 case BH_STATUS:
2027                         bh_status(info);
2028                         break;
2029                 default:
2030                         /* unknown work item ID */
2031                         printk("%s(%d):%s Unknown work item ID=%08X!\n",
2032                                 __FILE__,__LINE__,info->device_name,action);
2033                         break;
2034                 }
2035         }
2036
2037         if ( debug_level >= DEBUG_LEVEL_BH )
2038                 printk( "%s(%d):%s bh_handler() exit\n",
2039                         __FILE__,__LINE__,info->device_name);
2040 }
2041
2042 static void bh_receive(SLMP_INFO *info)
2043 {
2044         if ( debug_level >= DEBUG_LEVEL_BH )
2045                 printk( "%s(%d):%s bh_receive()\n",
2046                         __FILE__,__LINE__,info->device_name);
2047
2048         while( rx_get_frame(info) );
2049 }
2050
2051 static void bh_transmit(SLMP_INFO *info)
2052 {
2053         struct tty_struct *tty = info->port.tty;
2054
2055         if ( debug_level >= DEBUG_LEVEL_BH )
2056                 printk( "%s(%d):%s bh_transmit() entry\n",
2057                         __FILE__,__LINE__,info->device_name);
2058
2059         if (tty)
2060                 tty_wakeup(tty);
2061 }
2062
2063 static void bh_status(SLMP_INFO *info)
2064 {
2065         if ( debug_level >= DEBUG_LEVEL_BH )
2066                 printk( "%s(%d):%s bh_status() entry\n",
2067                         __FILE__,__LINE__,info->device_name);
2068
2069         info->ri_chkcount = 0;
2070         info->dsr_chkcount = 0;
2071         info->dcd_chkcount = 0;
2072         info->cts_chkcount = 0;
2073 }
2074
2075 static void isr_timer(SLMP_INFO * info)
2076 {
2077         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2078
2079         /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2080         write_reg(info, IER2, 0);
2081
2082         /* TMCS, Timer Control/Status Register
2083          *
2084          * 07      CMF, Compare match flag (read only) 1=match
2085          * 06      ECMI, CMF Interrupt Enable: 0=disabled
2086          * 05      Reserved, must be 0
2087          * 04      TME, Timer Enable
2088          * 03..00  Reserved, must be 0
2089          *
2090          * 0000 0000
2091          */
2092         write_reg(info, (unsigned char)(timer + TMCS), 0);
2093
2094         info->irq_occurred = true;
2095
2096         if ( debug_level >= DEBUG_LEVEL_ISR )
2097                 printk("%s(%d):%s isr_timer()\n",
2098                         __FILE__,__LINE__,info->device_name);
2099 }
2100
2101 static void isr_rxint(SLMP_INFO * info)
2102 {
2103         struct tty_struct *tty = info->port.tty;
2104         struct  mgsl_icount *icount = &info->icount;
2105         unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2106         unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2107
2108         /* clear status bits */
2109         if (status)
2110                 write_reg(info, SR1, status);
2111
2112         if (status2)
2113                 write_reg(info, SR2, status2);
2114
2115         if ( debug_level >= DEBUG_LEVEL_ISR )
2116                 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2117                         __FILE__,__LINE__,info->device_name,status,status2);
2118
2119         if (info->params.mode == MGSL_MODE_ASYNC) {
2120                 if (status & BRKD) {
2121                         icount->brk++;
2122
2123                         /* process break detection if tty control
2124                          * is not set to ignore it
2125                          */
2126                         if (!(status & info->ignore_status_mask1)) {
2127                                 if (info->read_status_mask1 & BRKD) {
2128                                         tty_insert_flip_char(&info->port, 0, TTY_BREAK);
2129                                         if (tty && (info->port.flags & ASYNC_SAK))
2130                                                 do_SAK(tty);
2131                                 }
2132                         }
2133                 }
2134         }
2135         else {
2136                 if (status & (FLGD|IDLD)) {
2137                         if (status & FLGD)
2138                                 info->icount.exithunt++;
2139                         else if (status & IDLD)
2140                                 info->icount.rxidle++;
2141                         wake_up_interruptible(&info->event_wait_q);
2142                 }
2143         }
2144
2145         if (status & CDCD) {
2146                 /* simulate a common modem status change interrupt
2147                  * for our handler
2148                  */
2149                 get_signals( info );
2150                 isr_io_pin(info,
2151                         MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2152         }
2153 }
2154
2155 /*
2156  * handle async rx data interrupts
2157  */
2158 static void isr_rxrdy(SLMP_INFO * info)
2159 {
2160         u16 status;
2161         unsigned char DataByte;
2162         struct  mgsl_icount *icount = &info->icount;
2163
2164         if ( debug_level >= DEBUG_LEVEL_ISR )
2165                 printk("%s(%d):%s isr_rxrdy\n",
2166                         __FILE__,__LINE__,info->device_name);
2167
2168         while((status = read_reg(info,CST0)) & BIT0)
2169         {
2170                 int flag = 0;
2171                 bool over = false;
2172                 DataByte = read_reg(info,TRB);
2173
2174                 icount->rx++;
2175
2176                 if ( status & (PE + FRME + OVRN) ) {
2177                         printk("%s(%d):%s rxerr=%04X\n",
2178                                 __FILE__,__LINE__,info->device_name,status);
2179
2180                         /* update error statistics */
2181                         if (status & PE)
2182                                 icount->parity++;
2183                         else if (status & FRME)
2184                                 icount->frame++;
2185                         else if (status & OVRN)
2186                                 icount->overrun++;
2187
2188                         /* discard char if tty control flags say so */
2189                         if (status & info->ignore_status_mask2)
2190                                 continue;
2191
2192                         status &= info->read_status_mask2;
2193
2194                         if (status & PE)
2195                                 flag = TTY_PARITY;
2196                         else if (status & FRME)
2197                                 flag = TTY_FRAME;
2198                         if (status & OVRN) {
2199                                 /* Overrun is special, since it's
2200                                  * reported immediately, and doesn't
2201                                  * affect the current character
2202                                  */
2203                                 over = true;
2204                         }
2205                 }       /* end of if (error) */
2206
2207                 tty_insert_flip_char(&info->port, DataByte, flag);
2208                 if (over)
2209                         tty_insert_flip_char(&info->port, 0, TTY_OVERRUN);
2210         }
2211
2212         if ( debug_level >= DEBUG_LEVEL_ISR ) {
2213                 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2214                         __FILE__,__LINE__,info->device_name,
2215                         icount->rx,icount->brk,icount->parity,
2216                         icount->frame,icount->overrun);
2217         }
2218
2219         tty_flip_buffer_push(&info->port);
2220 }
2221
2222 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2223 {
2224         if ( debug_level >= DEBUG_LEVEL_ISR )
2225                 printk("%s(%d):%s isr_txeom status=%02x\n",
2226                         __FILE__,__LINE__,info->device_name,status);
2227
2228         write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2229         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2230         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2231
2232         if (status & UDRN) {
2233                 write_reg(info, CMD, TXRESET);
2234                 write_reg(info, CMD, TXENABLE);
2235         } else
2236                 write_reg(info, CMD, TXBUFCLR);
2237
2238         /* disable and clear tx interrupts */
2239         info->ie0_value &= ~TXRDYE;
2240         info->ie1_value &= ~(IDLE + UDRN);
2241         write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2242         write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2243
2244         if ( info->tx_active ) {
2245                 if (info->params.mode != MGSL_MODE_ASYNC) {
2246                         if (status & UDRN)
2247                                 info->icount.txunder++;
2248                         else if (status & IDLE)
2249                                 info->icount.txok++;
2250                 }
2251
2252                 info->tx_active = false;
2253                 info->tx_count = info->tx_put = info->tx_get = 0;
2254
2255                 del_timer(&info->tx_timer);
2256
2257                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2258                         info->serial_signals &= ~SerialSignal_RTS;
2259                         info->drop_rts_on_tx_done = false;
2260                         set_signals(info);
2261                 }
2262
2263 #if SYNCLINK_GENERIC_HDLC
2264                 if (info->netcount)
2265                         hdlcdev_tx_done(info);
2266                 else
2267 #endif
2268                 {
2269                         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2270                                 tx_stop(info);
2271                                 return;
2272                         }
2273                         info->pending_bh |= BH_TRANSMIT;
2274                 }
2275         }
2276 }
2277
2278
2279 /*
2280  * handle tx status interrupts
2281  */
2282 static void isr_txint(SLMP_INFO * info)
2283 {
2284         unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2285
2286         /* clear status bits */
2287         write_reg(info, SR1, status);
2288
2289         if ( debug_level >= DEBUG_LEVEL_ISR )
2290                 printk("%s(%d):%s isr_txint status=%02x\n",
2291                         __FILE__,__LINE__,info->device_name,status);
2292
2293         if (status & (UDRN + IDLE))
2294                 isr_txeom(info, status);
2295
2296         if (status & CCTS) {
2297                 /* simulate a common modem status change interrupt
2298                  * for our handler
2299                  */
2300                 get_signals( info );
2301                 isr_io_pin(info,
2302                         MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2303
2304         }
2305 }
2306
2307 /*
2308  * handle async tx data interrupts
2309  */
2310 static void isr_txrdy(SLMP_INFO * info)
2311 {
2312         if ( debug_level >= DEBUG_LEVEL_ISR )
2313                 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2314                         __FILE__,__LINE__,info->device_name,info->tx_count);
2315
2316         if (info->params.mode != MGSL_MODE_ASYNC) {
2317                 /* disable TXRDY IRQ, enable IDLE IRQ */
2318                 info->ie0_value &= ~TXRDYE;
2319                 info->ie1_value |= IDLE;
2320                 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2321                 return;
2322         }
2323
2324         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2325                 tx_stop(info);
2326                 return;
2327         }
2328
2329         if ( info->tx_count )
2330                 tx_load_fifo( info );
2331         else {
2332                 info->tx_active = false;
2333                 info->ie0_value &= ~TXRDYE;
2334                 write_reg(info, IE0, info->ie0_value);
2335         }
2336
2337         if (info->tx_count < WAKEUP_CHARS)
2338                 info->pending_bh |= BH_TRANSMIT;
2339 }
2340
2341 static void isr_rxdmaok(SLMP_INFO * info)
2342 {
2343         /* BIT7 = EOT (end of transfer)
2344          * BIT6 = EOM (end of message/frame)
2345          */
2346         unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2347
2348         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2349         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2350
2351         if ( debug_level >= DEBUG_LEVEL_ISR )
2352                 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2353                         __FILE__,__LINE__,info->device_name,status);
2354
2355         info->pending_bh |= BH_RECEIVE;
2356 }
2357
2358 static void isr_rxdmaerror(SLMP_INFO * info)
2359 {
2360         /* BIT5 = BOF (buffer overflow)
2361          * BIT4 = COF (counter overflow)
2362          */
2363         unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2364
2365         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2366         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2367
2368         if ( debug_level >= DEBUG_LEVEL_ISR )
2369                 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2370                         __FILE__,__LINE__,info->device_name,status);
2371
2372         info->rx_overflow = true;
2373         info->pending_bh |= BH_RECEIVE;
2374 }
2375
2376 static void isr_txdmaok(SLMP_INFO * info)
2377 {
2378         unsigned char status_reg1 = read_reg(info, SR1);
2379
2380         write_reg(info, TXDMA + DIR, 0x00);     /* disable Tx DMA IRQs */
2381         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2382         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2383
2384         if ( debug_level >= DEBUG_LEVEL_ISR )
2385                 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2386                         __FILE__,__LINE__,info->device_name,status_reg1);
2387
2388         /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2389         write_reg16(info, TRC0, 0);
2390         info->ie0_value |= TXRDYE;
2391         write_reg(info, IE0, info->ie0_value);
2392 }
2393
2394 static void isr_txdmaerror(SLMP_INFO * info)
2395 {
2396         /* BIT5 = BOF (buffer overflow)
2397          * BIT4 = COF (counter overflow)
2398          */
2399         unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2400
2401         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2402         write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2403
2404         if ( debug_level >= DEBUG_LEVEL_ISR )
2405                 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2406                         __FILE__,__LINE__,info->device_name,status);
2407 }
2408
2409 /* handle input serial signal changes
2410  */
2411 static void isr_io_pin( SLMP_INFO *info, u16 status )
2412 {
2413         struct  mgsl_icount *icount;
2414
2415         if ( debug_level >= DEBUG_LEVEL_ISR )
2416                 printk("%s(%d):isr_io_pin status=%04X\n",
2417                         __FILE__,__LINE__,status);
2418
2419         if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2420                       MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2421                 icount = &info->icount;
2422                 /* update input line counters */
2423                 if (status & MISCSTATUS_RI_LATCHED) {
2424                         icount->rng++;
2425                         if ( status & SerialSignal_RI )
2426                                 info->input_signal_events.ri_up++;
2427                         else
2428                                 info->input_signal_events.ri_down++;
2429                 }
2430                 if (status & MISCSTATUS_DSR_LATCHED) {
2431                         icount->dsr++;
2432                         if ( status & SerialSignal_DSR )
2433                                 info->input_signal_events.dsr_up++;
2434                         else
2435                                 info->input_signal_events.dsr_down++;
2436                 }
2437                 if (status & MISCSTATUS_DCD_LATCHED) {
2438                         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2439                                 info->ie1_value &= ~CDCD;
2440                                 write_reg(info, IE1, info->ie1_value);
2441                         }
2442                         icount->dcd++;
2443                         if (status & SerialSignal_DCD) {
2444                                 info->input_signal_events.dcd_up++;
2445                         } else
2446                                 info->input_signal_events.dcd_down++;
2447 #if SYNCLINK_GENERIC_HDLC
2448                         if (info->netcount) {
2449                                 if (status & SerialSignal_DCD)
2450                                         netif_carrier_on(info->netdev);
2451                                 else
2452                                         netif_carrier_off(info->netdev);
2453                         }
2454 #endif
2455                 }
2456                 if (status & MISCSTATUS_CTS_LATCHED)
2457                 {
2458                         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2459                                 info->ie1_value &= ~CCTS;
2460                                 write_reg(info, IE1, info->ie1_value);
2461                         }
2462                         icount->cts++;
2463                         if ( status & SerialSignal_CTS )
2464                                 info->input_signal_events.cts_up++;
2465                         else
2466                                 info->input_signal_events.cts_down++;
2467                 }
2468                 wake_up_interruptible(&info->status_event_wait_q);
2469                 wake_up_interruptible(&info->event_wait_q);
2470
2471                 if ( (info->port.flags & ASYNC_CHECK_CD) &&
2472                      (status & MISCSTATUS_DCD_LATCHED) ) {
2473                         if ( debug_level >= DEBUG_LEVEL_ISR )
2474                                 printk("%s CD now %s...", info->device_name,
2475                                        (status & SerialSignal_DCD) ? "on" : "off");
2476                         if (status & SerialSignal_DCD)
2477                                 wake_up_interruptible(&info->port.open_wait);
2478                         else {
2479                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2480                                         printk("doing serial hangup...");
2481                                 if (info->port.tty)
2482                                         tty_hangup(info->port.tty);
2483                         }
2484                 }
2485
2486                 if (tty_port_cts_enabled(&info->port) &&
2487                      (status & MISCSTATUS_CTS_LATCHED) ) {
2488                         if ( info->port.tty ) {
2489                                 if (info->port.tty->hw_stopped) {
2490                                         if (status & SerialSignal_CTS) {
2491                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2492                                                         printk("CTS tx start...");
2493                                                 info->port.tty->hw_stopped = 0;
2494                                                 tx_start(info);
2495                                                 info->pending_bh |= BH_TRANSMIT;
2496                                                 return;
2497                                         }
2498                                 } else {
2499                                         if (!(status & SerialSignal_CTS)) {
2500                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2501                                                         printk("CTS tx stop...");
2502                                                 info->port.tty->hw_stopped = 1;
2503                                                 tx_stop(info);
2504                                         }
2505                                 }
2506                         }
2507                 }
2508         }
2509
2510         info->pending_bh |= BH_STATUS;
2511 }
2512
2513 /* Interrupt service routine entry point.
2514  *
2515  * Arguments:
2516  *      irq             interrupt number that caused interrupt
2517  *      dev_id          device ID supplied during interrupt registration
2518  *      regs            interrupted processor context
2519  */
2520 static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
2521 {
2522         SLMP_INFO *info = dev_id;
2523         unsigned char status, status0, status1=0;
2524         unsigned char dmastatus, dmastatus0, dmastatus1=0;
2525         unsigned char timerstatus0, timerstatus1=0;
2526         unsigned char shift;
2527         unsigned int i;
2528         unsigned short tmp;
2529
2530         if ( debug_level >= DEBUG_LEVEL_ISR )
2531                 printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
2532                         __FILE__, __LINE__, info->irq_level);
2533
2534         spin_lock(&info->lock);
2535
2536         for(;;) {
2537
2538                 /* get status for SCA0 (ports 0-1) */
2539                 tmp = read_reg16(info, ISR0);   /* get ISR0 and ISR1 in one read */
2540                 status0 = (unsigned char)tmp;
2541                 dmastatus0 = (unsigned char)(tmp>>8);
2542                 timerstatus0 = read_reg(info, ISR2);
2543
2544                 if ( debug_level >= DEBUG_LEVEL_ISR )
2545                         printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2546                                 __FILE__, __LINE__, info->device_name,
2547                                 status0, dmastatus0, timerstatus0);
2548
2549                 if (info->port_count == 4) {
2550                         /* get status for SCA1 (ports 2-3) */
2551                         tmp = read_reg16(info->port_array[2], ISR0);
2552                         status1 = (unsigned char)tmp;
2553                         dmastatus1 = (unsigned char)(tmp>>8);
2554                         timerstatus1 = read_reg(info->port_array[2], ISR2);
2555
2556                         if ( debug_level >= DEBUG_LEVEL_ISR )
2557                                 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2558                                         __FILE__,__LINE__,info->device_name,
2559                                         status1,dmastatus1,timerstatus1);
2560                 }
2561
2562                 if (!status0 && !dmastatus0 && !timerstatus0 &&
2563                          !status1 && !dmastatus1 && !timerstatus1)
2564                         break;
2565
2566                 for(i=0; i < info->port_count ; i++) {
2567                         if (info->port_array[i] == NULL)
2568                                 continue;
2569                         if (i < 2) {
2570                                 status = status0;
2571                                 dmastatus = dmastatus0;
2572                         } else {
2573                                 status = status1;
2574                                 dmastatus = dmastatus1;
2575                         }
2576
2577                         shift = i & 1 ? 4 :0;
2578
2579                         if (status & BIT0 << shift)
2580                                 isr_rxrdy(info->port_array[i]);
2581                         if (status & BIT1 << shift)
2582                                 isr_txrdy(info->port_array[i]);
2583                         if (status & BIT2 << shift)
2584                                 isr_rxint(info->port_array[i]);
2585                         if (status & BIT3 << shift)
2586                                 isr_txint(info->port_array[i]);
2587
2588                         if (dmastatus & BIT0 << shift)
2589                                 isr_rxdmaerror(info->port_array[i]);
2590                         if (dmastatus & BIT1 << shift)
2591                                 isr_rxdmaok(info->port_array[i]);
2592                         if (dmastatus & BIT2 << shift)
2593                                 isr_txdmaerror(info->port_array[i]);
2594                         if (dmastatus & BIT3 << shift)
2595                                 isr_txdmaok(info->port_array[i]);
2596                 }
2597
2598                 if (timerstatus0 & (BIT5 | BIT4))
2599                         isr_timer(info->port_array[0]);
2600                 if (timerstatus0 & (BIT7 | BIT6))
2601                         isr_timer(info->port_array[1]);
2602                 if (timerstatus1 & (BIT5 | BIT4))
2603                         isr_timer(info->port_array[2]);
2604                 if (timerstatus1 & (BIT7 | BIT6))
2605                         isr_timer(info->port_array[3]);
2606         }
2607
2608         for(i=0; i < info->port_count ; i++) {
2609                 SLMP_INFO * port = info->port_array[i];
2610
2611                 /* Request bottom half processing if there's something
2612                  * for it to do and the bh is not already running.
2613                  *
2614                  * Note: startup adapter diags require interrupts.
2615                  * do not request bottom half processing if the
2616                  * device is not open in a normal mode.
2617                  */
2618                 if ( port && (port->port.count || port->netcount) &&
2619                      port->pending_bh && !port->bh_running &&
2620                      !port->bh_requested ) {
2621                         if ( debug_level >= DEBUG_LEVEL_ISR )
2622                                 printk("%s(%d):%s queueing bh task.\n",
2623                                         __FILE__,__LINE__,port->device_name);
2624                         schedule_work(&port->task);
2625                         port->bh_requested = true;
2626                 }
2627         }
2628
2629         spin_unlock(&info->lock);
2630
2631         if ( debug_level >= DEBUG_LEVEL_ISR )
2632                 printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
2633                         __FILE__, __LINE__, info->irq_level);
2634         return IRQ_HANDLED;
2635 }
2636
2637 /* Initialize and start device.
2638  */
2639 static int startup(SLMP_INFO * info)
2640 {
2641         if ( debug_level >= DEBUG_LEVEL_INFO )
2642                 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2643
2644         if (info->port.flags & ASYNC_INITIALIZED)
2645                 return 0;
2646
2647         if (!info->tx_buf) {
2648                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2649                 if (!info->tx_buf) {
2650                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2651                                 __FILE__,__LINE__,info->device_name);
2652                         return -ENOMEM;
2653                 }
2654         }
2655
2656         info->pending_bh = 0;
2657
2658         memset(&info->icount, 0, sizeof(info->icount));
2659
2660         /* program hardware for current parameters */
2661         reset_port(info);
2662
2663         change_params(info);
2664
2665         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
2666
2667         if (info->port.tty)
2668                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2669
2670         info->port.flags |= ASYNC_INITIALIZED;
2671
2672         return 0;
2673 }
2674
2675 /* Called by close() and hangup() to shutdown hardware
2676  */
2677 static void shutdown(SLMP_INFO * info)
2678 {
2679         unsigned long flags;
2680
2681         if (!(info->port.flags & ASYNC_INITIALIZED))
2682                 return;
2683
2684         if (debug_level >= DEBUG_LEVEL_INFO)
2685                 printk("%s(%d):%s synclinkmp_shutdown()\n",
2686                          __FILE__,__LINE__, info->device_name );
2687
2688         /* clear status wait queue because status changes */
2689         /* can't happen after shutting down the hardware */
2690         wake_up_interruptible(&info->status_event_wait_q);
2691         wake_up_interruptible(&info->event_wait_q);
2692
2693         del_timer(&info->tx_timer);
2694         del_timer(&info->status_timer);
2695
2696         kfree(info->tx_buf);
2697         info->tx_buf = NULL;
2698
2699         spin_lock_irqsave(&info->lock,flags);
2700
2701         reset_port(info);
2702
2703         if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2704                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2705                 set_signals(info);
2706         }
2707
2708         spin_unlock_irqrestore(&info->lock,flags);
2709
2710         if (info->port.tty)
2711                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2712
2713         info->port.flags &= ~ASYNC_INITIALIZED;
2714 }
2715
2716 static void program_hw(SLMP_INFO *info)
2717 {
2718         unsigned long flags;
2719
2720         spin_lock_irqsave(&info->lock,flags);
2721
2722         rx_stop(info);
2723         tx_stop(info);
2724
2725         info->tx_count = info->tx_put = info->tx_get = 0;
2726
2727         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2728                 hdlc_mode(info);
2729         else
2730                 async_mode(info);
2731
2732         set_signals(info);
2733
2734         info->dcd_chkcount = 0;
2735         info->cts_chkcount = 0;
2736         info->ri_chkcount = 0;
2737         info->dsr_chkcount = 0;
2738
2739         info->ie1_value |= (CDCD|CCTS);
2740         write_reg(info, IE1, info->ie1_value);
2741
2742         get_signals(info);
2743
2744         if (info->netcount || (info->port.tty && info->port.tty->termios.c_cflag & CREAD) )
2745                 rx_start(info);
2746
2747         spin_unlock_irqrestore(&info->lock,flags);
2748 }
2749
2750 /* Reconfigure adapter based on new parameters
2751  */
2752 static void change_params(SLMP_INFO *info)
2753 {
2754         unsigned cflag;
2755         int bits_per_char;
2756
2757         if (!info->port.tty)
2758                 return;
2759
2760         if (debug_level >= DEBUG_LEVEL_INFO)
2761                 printk("%s(%d):%s change_params()\n",
2762                          __FILE__,__LINE__, info->device_name );
2763
2764         cflag = info->port.tty->termios.c_cflag;
2765
2766         /* if B0 rate (hangup) specified then negate RTS and DTR */
2767         /* otherwise assert RTS and DTR */
2768         if (cflag & CBAUD)
2769                 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
2770         else
2771                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2772
2773         /* byte size and parity */
2774
2775         switch (cflag & CSIZE) {
2776               case CS5: info->params.data_bits = 5; break;
2777               case CS6: info->params.data_bits = 6; break;
2778               case CS7: info->params.data_bits = 7; break;
2779               case CS8: info->params.data_bits = 8; break;
2780               /* Never happens, but GCC is too dumb to figure it out */
2781               default:  info->params.data_bits = 7; break;
2782               }
2783
2784         if (cflag & CSTOPB)
2785                 info->params.stop_bits = 2;
2786         else
2787                 info->params.stop_bits = 1;
2788
2789         info->params.parity = ASYNC_PARITY_NONE;
2790         if (cflag & PARENB) {
2791                 if (cflag & PARODD)
2792                         info->params.parity = ASYNC_PARITY_ODD;
2793                 else
2794                         info->params.parity = ASYNC_PARITY_EVEN;
2795 #ifdef CMSPAR
2796                 if (cflag & CMSPAR)
2797                         info->params.parity = ASYNC_PARITY_SPACE;
2798 #endif
2799         }
2800
2801         /* calculate number of jiffies to transmit a full
2802          * FIFO (32 bytes) at specified data rate
2803          */
2804         bits_per_char = info->params.data_bits +
2805                         info->params.stop_bits + 1;
2806
2807         /* if port data rate is set to 460800 or less then
2808          * allow tty settings to override, otherwise keep the
2809          * current data rate.
2810          */
2811         if (info->params.data_rate <= 460800) {
2812                 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2813         }
2814
2815         if ( info->params.data_rate ) {
2816                 info->timeout = (32*HZ*bits_per_char) /
2817                                 info->params.data_rate;
2818         }
2819         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2820
2821         if (cflag & CRTSCTS)
2822                 info->port.flags |= ASYNC_CTS_FLOW;
2823         else
2824                 info->port.flags &= ~ASYNC_CTS_FLOW;
2825
2826         if (cflag & CLOCAL)
2827                 info->port.flags &= ~ASYNC_CHECK_CD;
2828         else
2829                 info->port.flags |= ASYNC_CHECK_CD;
2830
2831         /* process tty input control flags */
2832
2833         info->read_status_mask2 = OVRN;
2834         if (I_INPCK(info->port.tty))
2835                 info->read_status_mask2 |= PE | FRME;
2836         if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2837                 info->read_status_mask1 |= BRKD;
2838         if (I_IGNPAR(info->port.tty))
2839                 info->ignore_status_mask2 |= PE | FRME;
2840         if (I_IGNBRK(info->port.tty)) {
2841                 info->ignore_status_mask1 |= BRKD;
2842                 /* If ignoring parity and break indicators, ignore
2843                  * overruns too.  (For real raw support).
2844                  */
2845                 if (I_IGNPAR(info->port.tty))
2846                         info->ignore_status_mask2 |= OVRN;
2847         }
2848
2849         program_hw(info);
2850 }
2851
2852 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2853 {
2854         int err;
2855
2856         if (debug_level >= DEBUG_LEVEL_INFO)
2857                 printk("%s(%d):%s get_params()\n",
2858                          __FILE__,__LINE__, info->device_name);
2859
2860         if (!user_icount) {
2861                 memset(&info->icount, 0, sizeof(info->icount));
2862         } else {
2863                 mutex_lock(&info->port.mutex);
2864                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2865                 mutex_unlock(&info->port.mutex);
2866                 if (err)
2867                         return -EFAULT;
2868         }
2869
2870         return 0;
2871 }
2872
2873 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2874 {
2875         int err;
2876         if (debug_level >= DEBUG_LEVEL_INFO)
2877                 printk("%s(%d):%s get_params()\n",
2878                          __FILE__,__LINE__, info->device_name);
2879
2880         mutex_lock(&info->port.mutex);
2881         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2882         mutex_unlock(&info->port.mutex);
2883         if (err) {
2884                 if ( debug_level >= DEBUG_LEVEL_INFO )
2885                         printk( "%s(%d):%s get_params() user buffer copy failed\n",
2886                                 __FILE__,__LINE__,info->device_name);
2887                 return -EFAULT;
2888         }
2889
2890         return 0;
2891 }
2892
2893 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2894 {
2895         unsigned long flags;
2896         MGSL_PARAMS tmp_params;
2897         int err;
2898
2899         if (debug_level >= DEBUG_LEVEL_INFO)
2900                 printk("%s(%d):%s set_params\n",
2901                         __FILE__,__LINE__,info->device_name );
2902         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2903         if (err) {
2904                 if ( debug_level >= DEBUG_LEVEL_INFO )
2905                         printk( "%s(%d):%s set_params() user buffer copy failed\n",
2906                                 __FILE__,__LINE__,info->device_name);
2907                 return -EFAULT;
2908         }
2909
2910         mutex_lock(&info->port.mutex);
2911         spin_lock_irqsave(&info->lock,flags);
2912         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2913         spin_unlock_irqrestore(&info->lock,flags);
2914
2915         change_params(info);
2916         mutex_unlock(&info->port.mutex);
2917
2918         return 0;
2919 }
2920
2921 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
2922 {
2923         int err;
2924
2925         if (debug_level >= DEBUG_LEVEL_INFO)
2926                 printk("%s(%d):%s get_txidle()=%d\n",
2927                          __FILE__,__LINE__, info->device_name, info->idle_mode);
2928
2929         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2930         if (err) {
2931                 if ( debug_level >= DEBUG_LEVEL_INFO )
2932                         printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
2933                                 __FILE__,__LINE__,info->device_name);
2934                 return -EFAULT;
2935         }
2936
2937         return 0;
2938 }
2939
2940 static int set_txidle(SLMP_INFO * info, int idle_mode)
2941 {
2942         unsigned long flags;
2943
2944         if (debug_level >= DEBUG_LEVEL_INFO)
2945                 printk("%s(%d):%s set_txidle(%d)\n",
2946                         __FILE__,__LINE__,info->device_name, idle_mode );
2947
2948         spin_lock_irqsave(&info->lock,flags);
2949         info->idle_mode = idle_mode;
2950         tx_set_idle( info );
2951         spin_unlock_irqrestore(&info->lock,flags);
2952         return 0;
2953 }
2954
2955 static int tx_enable(SLMP_INFO * info, int enable)
2956 {
2957         unsigned long flags;
2958
2959         if (debug_level >= DEBUG_LEVEL_INFO)
2960                 printk("%s(%d):%s tx_enable(%d)\n",
2961                         __FILE__,__LINE__,info->device_name, enable);
2962
2963         spin_lock_irqsave(&info->lock,flags);
2964         if ( enable ) {
2965                 if ( !info->tx_enabled ) {
2966                         tx_start(info);
2967                 }
2968         } else {
2969                 if ( info->tx_enabled )
2970                         tx_stop(info);
2971         }
2972         spin_unlock_irqrestore(&info->lock,flags);
2973         return 0;
2974 }
2975
2976 /* abort send HDLC frame
2977  */
2978 static int tx_abort(SLMP_INFO * info)
2979 {
2980         unsigned long flags;
2981
2982         if (debug_level >= DEBUG_LEVEL_INFO)
2983                 printk("%s(%d):%s tx_abort()\n",
2984                         __FILE__,__LINE__,info->device_name);
2985
2986         spin_lock_irqsave(&info->lock,flags);
2987         if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
2988                 info->ie1_value &= ~UDRN;
2989                 info->ie1_value |= IDLE;
2990                 write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
2991                 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
2992
2993                 write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
2994                 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2995
2996                 write_reg(info, CMD, TXABORT);
2997         }
2998         spin_unlock_irqrestore(&info->lock,flags);
2999         return 0;
3000 }
3001
3002 static int rx_enable(SLMP_INFO * info, int enable)
3003 {
3004         unsigned long flags;
3005
3006         if (debug_level >= DEBUG_LEVEL_INFO)
3007                 printk("%s(%d):%s rx_enable(%d)\n",
3008                         __FILE__,__LINE__,info->device_name,enable);
3009
3010         spin_lock_irqsave(&info->lock,flags);
3011         if ( enable ) {
3012                 if ( !info->rx_enabled )
3013                         rx_start(info);
3014         } else {
3015                 if ( info->rx_enabled )
3016                         rx_stop(info);
3017         }
3018         spin_unlock_irqrestore(&info->lock,flags);
3019         return 0;
3020 }
3021
3022 /* wait for specified event to occur
3023  */
3024 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3025 {
3026         unsigned long flags;
3027         int s;
3028         int rc=0;
3029         struct mgsl_icount cprev, cnow;
3030         int events;
3031         int mask;
3032         struct  _input_signal_events oldsigs, newsigs;
3033         DECLARE_WAITQUEUE(wait, current);
3034
3035         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3036         if (rc) {
3037                 return  -EFAULT;
3038         }
3039
3040         if (debug_level >= DEBUG_LEVEL_INFO)
3041                 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3042                         __FILE__,__LINE__,info->device_name,mask);
3043
3044         spin_lock_irqsave(&info->lock,flags);
3045
3046         /* return immediately if state matches requested events */
3047         get_signals(info);
3048         s = info->serial_signals;
3049
3050         events = mask &
3051                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3052                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3053                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3054                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3055         if (events) {
3056                 spin_unlock_irqrestore(&info->lock,flags);
3057                 goto exit;
3058         }
3059
3060         /* save current irq counts */
3061         cprev = info->icount;
3062         oldsigs = info->input_signal_events;
3063
3064         /* enable hunt and idle irqs if needed */
3065         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3066                 unsigned char oldval = info->ie1_value;
3067                 unsigned char newval = oldval +
3068                          (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3069                          (mask & MgslEvent_IdleReceived ? IDLD:0);
3070                 if ( oldval != newval ) {
3071                         info->ie1_value = newval;
3072                         write_reg(info, IE1, info->ie1_value);
3073                 }
3074         }
3075
3076         set_current_state(TASK_INTERRUPTIBLE);
3077         add_wait_queue(&info->event_wait_q, &wait);
3078
3079         spin_unlock_irqrestore(&info->lock,flags);
3080
3081         for(;;) {
3082                 schedule();
3083                 if (signal_pending(current)) {
3084                         rc = -ERESTARTSYS;
3085                         break;
3086                 }
3087
3088                 /* get current irq counts */
3089                 spin_lock_irqsave(&info->lock,flags);
3090                 cnow = info->icount;
3091                 newsigs = info->input_signal_events;
3092                 set_current_state(TASK_INTERRUPTIBLE);
3093                 spin_unlock_irqrestore(&info->lock,flags);
3094
3095                 /* if no change, wait aborted for some reason */
3096                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
3097                     newsigs.dsr_down == oldsigs.dsr_down &&
3098                     newsigs.dcd_up   == oldsigs.dcd_up   &&
3099                     newsigs.dcd_down == oldsigs.dcd_down &&
3100                     newsigs.cts_up   == oldsigs.cts_up   &&
3101                     newsigs.cts_down == oldsigs.cts_down &&
3102                     newsigs.ri_up    == oldsigs.ri_up    &&
3103                     newsigs.ri_down  == oldsigs.ri_down  &&
3104                     cnow.exithunt    == cprev.exithunt   &&
3105                     cnow.rxidle      == cprev.rxidle) {
3106                         rc = -EIO;
3107                         break;
3108                 }
3109
3110                 events = mask &
3111                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
3112                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3113                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
3114                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3115                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
3116                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3117                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
3118                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
3119                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
3120                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
3121                 if (events)
3122                         break;
3123
3124                 cprev = cnow;
3125                 oldsigs = newsigs;
3126         }
3127
3128         remove_wait_queue(&info->event_wait_q, &wait);
3129         set_current_state(TASK_RUNNING);
3130
3131
3132         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3133                 spin_lock_irqsave(&info->lock,flags);
3134                 if (!waitqueue_active(&info->event_wait_q)) {
3135                         /* disable enable exit hunt mode/idle rcvd IRQs */
3136                         info->ie1_value &= ~(FLGD|IDLD);
3137                         write_reg(info, IE1, info->ie1_value);
3138                 }
3139                 spin_unlock_irqrestore(&info->lock,flags);
3140         }
3141 exit:
3142         if ( rc == 0 )
3143                 PUT_USER(rc, events, mask_ptr);
3144
3145         return rc;
3146 }
3147
3148 static int modem_input_wait(SLMP_INFO *info,int arg)
3149 {
3150         unsigned long flags;
3151         int rc;
3152         struct mgsl_icount cprev, cnow;
3153         DECLARE_WAITQUEUE(wait, current);
3154
3155         /* save current irq counts */
3156         spin_lock_irqsave(&info->lock,flags);
3157         cprev = info->icount;
3158         add_wait_queue(&info->status_event_wait_q, &wait);
3159         set_current_state(TASK_INTERRUPTIBLE);
3160         spin_unlock_irqrestore(&info->lock,flags);
3161
3162         for(;;) {
3163                 schedule();
3164                 if (signal_pending(current)) {
3165                         rc = -ERESTARTSYS;
3166                         break;
3167                 }
3168
3169                 /* get new irq counts */
3170                 spin_lock_irqsave(&info->lock,flags);
3171                 cnow = info->icount;
3172                 set_current_state(TASK_INTERRUPTIBLE);
3173                 spin_unlock_irqrestore(&info->lock,flags);
3174
3175                 /* if no change, wait aborted for some reason */
3176                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3177                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3178                         rc = -EIO;
3179                         break;
3180                 }
3181
3182                 /* check for change in caller specified modem input */
3183                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3184                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3185                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3186                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3187                         rc = 0;
3188                         break;
3189                 }
3190
3191                 cprev = cnow;
3192         }
3193         remove_wait_queue(&info->status_event_wait_q, &wait);
3194         set_current_state(TASK_RUNNING);
3195         return rc;
3196 }
3197
3198 /* return the state of the serial control and status signals
3199  */
3200 static int tiocmget(struct tty_struct *tty)
3201 {
3202         SLMP_INFO *info = tty->driver_data;
3203         unsigned int result;
3204         unsigned long flags;
3205
3206         spin_lock_irqsave(&info->lock,flags);
3207         get_signals(info);
3208         spin_unlock_irqrestore(&info->lock,flags);
3209
3210         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS : 0) |
3211                  ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR : 0) |
3212                  ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR : 0) |
3213                  ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG : 0) |
3214                  ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR : 0) |
3215                  ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS : 0);
3216
3217         if (debug_level >= DEBUG_LEVEL_INFO)
3218                 printk("%s(%d):%s tiocmget() value=%08X\n",
3219                          __FILE__,__LINE__, info->device_name, result );
3220         return result;
3221 }
3222
3223 /* set modem control signals (DTR/RTS)
3224  */
3225 static int tiocmset(struct tty_struct *tty,
3226                                         unsigned int set, unsigned int clear)
3227 {
3228         SLMP_INFO *info = tty->driver_data;
3229         unsigned long flags;
3230
3231         if (debug_level >= DEBUG_LEVEL_INFO)
3232                 printk("%s(%d):%s tiocmset(%x,%x)\n",
3233                         __FILE__,__LINE__,info->device_name, set, clear);
3234
3235         if (set & TIOCM_RTS)
3236                 info->serial_signals |= SerialSignal_RTS;
3237         if (set & TIOCM_DTR)
3238                 info->serial_signals |= SerialSignal_DTR;
3239         if (clear & TIOCM_RTS)
3240                 info->serial_signals &= ~SerialSignal_RTS;
3241         if (clear & TIOCM_DTR)
3242                 info->serial_signals &= ~SerialSignal_DTR;
3243
3244         spin_lock_irqsave(&info->lock,flags);
3245         set_signals(info);
3246         spin_unlock_irqrestore(&info->lock,flags);
3247
3248         return 0;
3249 }
3250
3251 static int carrier_raised(struct tty_port *port)
3252 {
3253         SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3254         unsigned long flags;
3255
3256         spin_lock_irqsave(&info->lock,flags);
3257         get_signals(info);
3258         spin_unlock_irqrestore(&info->lock,flags);
3259
3260         return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
3261 }
3262
3263 static void dtr_rts(struct tty_port *port, int on)
3264 {
3265         SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3266         unsigned long flags;
3267
3268         spin_lock_irqsave(&info->lock,flags);
3269         if (on)
3270                 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
3271         else
3272                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3273         set_signals(info);
3274         spin_unlock_irqrestore(&info->lock,flags);
3275 }
3276
3277 /* Block the current process until the specified port is ready to open.
3278  */
3279 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3280                            SLMP_INFO *info)
3281 {
3282         DECLARE_WAITQUEUE(wait, current);
3283         int             retval;
3284         bool            do_clocal = false;
3285         unsigned long   flags;
3286         int             cd;
3287         struct tty_port *port = &info->port;
3288
3289         if (debug_level >= DEBUG_LEVEL_INFO)
3290                 printk("%s(%d):%s block_til_ready()\n",
3291                          __FILE__,__LINE__, tty->driver->name );
3292
3293         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3294                 /* nonblock mode is set or port is not enabled */
3295                 /* just verify that callout device is not active */
3296                 port->flags |= ASYNC_NORMAL_ACTIVE;
3297                 return 0;
3298         }
3299
3300         if (tty->termios.c_cflag & CLOCAL)
3301                 do_clocal = true;
3302
3303         /* Wait for carrier detect and the line to become
3304          * free (i.e., not in use by the callout).  While we are in
3305          * this loop, port->count is dropped by one, so that
3306          * close() knows when to free things.  We restore it upon
3307          * exit, either normal or abnormal.
3308          */
3309
3310         retval = 0;
3311         add_wait_queue(&port->open_wait, &wait);
3312
3313         if (debug_level >= DEBUG_LEVEL_INFO)
3314                 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3315                          __FILE__,__LINE__, tty->driver->name, port->count );
3316
3317         spin_lock_irqsave(&info->lock, flags);
3318         port->count--;
3319         spin_unlock_irqrestore(&info->lock, flags);
3320         port->blocked_open++;
3321
3322         while (1) {
3323                 if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
3324                         tty_port_raise_dtr_rts(port);
3325
3326                 set_current_state(TASK_INTERRUPTIBLE);
3327
3328                 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3329                         retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3330                                         -EAGAIN : -ERESTARTSYS;
3331                         break;
3332                 }
3333
3334                 cd = tty_port_carrier_raised(port);
3335                 if (do_clocal || cd)
3336                         break;
3337
3338                 if (signal_pending(current)) {
3339                         retval = -ERESTARTSYS;
3340                         break;
3341                 }
3342
3343                 if (debug_level >= DEBUG_LEVEL_INFO)
3344                         printk("%s(%d):%s block_til_ready() count=%d\n",
3345                                  __FILE__,__LINE__, tty->driver->name, port->count );
3346
3347                 tty_unlock(tty);
3348                 schedule();
3349                 tty_lock(tty);
3350         }
3351
3352         set_current_state(TASK_RUNNING);
3353         remove_wait_queue(&port->open_wait, &wait);
3354         if (!tty_hung_up_p(filp))
3355                 port->count++;
3356         port->blocked_open--;
3357
3358         if (debug_level >= DEBUG_LEVEL_INFO)
3359                 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3360                          __FILE__,__LINE__, tty->driver->name, port->count );
3361
3362         if (!retval)
3363                 port->flags |= ASYNC_NORMAL_ACTIVE;
3364
3365         return retval;
3366 }
3367
3368 static int alloc_dma_bufs(SLMP_INFO *info)
3369 {
3370         unsigned short BuffersPerFrame;
3371         unsigned short BufferCount;
3372
3373         // Force allocation to start at 64K boundary for each port.
3374         // This is necessary because *all* buffer descriptors for a port
3375         // *must* be in the same 64K block. All descriptors on a port
3376         // share a common 'base' address (upper 8 bits of 24 bits) programmed
3377         // into the CBP register.
3378         info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3379
3380         /* Calculate the number of DMA buffers necessary to hold the */
3381         /* largest allowable frame size. Note: If the max frame size is */
3382         /* not an even multiple of the DMA buffer size then we need to */
3383         /* round the buffer count per frame up one. */
3384
3385         BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3386         if ( info->max_frame_size % SCABUFSIZE )
3387                 BuffersPerFrame++;
3388
3389         /* calculate total number of data buffers (SCABUFSIZE) possible
3390          * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3391          * for the descriptor list (BUFFERLISTSIZE).
3392          */
3393         BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3394
3395         /* limit number of buffers to maximum amount of descriptors */
3396         if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3397                 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3398
3399         /* use enough buffers to transmit one max size frame */
3400         info->tx_buf_count = BuffersPerFrame + 1;
3401
3402         /* never use more than half the available buffers for transmit */
3403         if (info->tx_buf_count > (BufferCount/2))
3404                 info->tx_buf_count = BufferCount/2;
3405
3406         if (info->tx_buf_count > SCAMAXDESC)
3407                 info->tx_buf_count = SCAMAXDESC;
3408
3409         /* use remaining buffers for receive */
3410         info->rx_buf_count = BufferCount - info->tx_buf_count;
3411
3412         if (info->rx_buf_count > SCAMAXDESC)
3413                 info->rx_buf_count = SCAMAXDESC;
3414
3415         if ( debug_level >= DEBUG_LEVEL_INFO )
3416                 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3417                         __FILE__,__LINE__, info->device_name,
3418                         info->tx_buf_count,info->rx_buf_count);
3419
3420         if ( alloc_buf_list( info ) < 0 ||
3421                 alloc_frame_bufs(info,
3422                                         info->rx_buf_list,
3423                                         info->rx_buf_list_ex,
3424                                         info->rx_buf_count) < 0 ||
3425                 alloc_frame_bufs(info,
3426                                         info->tx_buf_list,
3427                                         info->tx_buf_list_ex,
3428                                         info->tx_buf_count) < 0 ||
3429                 alloc_tmp_rx_buf(info) < 0 ) {
3430                 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3431                         __FILE__,__LINE__, info->device_name);
3432                 return -ENOMEM;
3433         }
3434
3435         rx_reset_buffers( info );
3436
3437         return 0;
3438 }
3439
3440 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3441  */
3442 static int alloc_buf_list(SLMP_INFO *info)
3443 {
3444         unsigned int i;
3445
3446         /* build list in adapter shared memory */
3447         info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3448         info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3449         info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3450
3451         memset(info->buffer_list, 0, BUFFERLISTSIZE);
3452
3453         /* Save virtual address pointers to the receive and */
3454         /* transmit buffer lists. (Receive 1st). These pointers will */
3455         /* be used by the processor to access the lists. */
3456         info->rx_buf_list = (SCADESC *)info->buffer_list;
3457
3458         info->tx_buf_list = (SCADESC *)info->buffer_list;
3459         info->tx_buf_list += info->rx_buf_count;
3460
3461         /* Build links for circular buffer entry lists (tx and rx)
3462          *
3463          * Note: links are physical addresses read by the SCA device
3464          * to determine the next buffer entry to use.
3465          */
3466
3467         for ( i = 0; i < info->rx_buf_count; i++ ) {
3468                 /* calculate and store physical address of this buffer entry */
3469                 info->rx_buf_list_ex[i].phys_entry =
3470                         info->buffer_list_phys + (i * SCABUFSIZE);
3471
3472                 /* calculate and store physical address of */
3473                 /* next entry in cirular list of entries */
3474                 info->rx_buf_list[i].next = info->buffer_list_phys;
3475                 if ( i < info->rx_buf_count - 1 )
3476                         info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3477
3478                 info->rx_buf_list[i].length = SCABUFSIZE;
3479         }
3480
3481         for ( i = 0; i < info->tx_buf_count; i++ ) {
3482                 /* calculate and store physical address of this buffer entry */
3483                 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3484                         ((info->rx_buf_count + i) * sizeof(SCADESC));
3485
3486                 /* calculate and store physical address of */
3487                 /* next entry in cirular list of entries */
3488
3489                 info->tx_buf_list[i].next = info->buffer_list_phys +
3490                         info->rx_buf_count * sizeof(SCADESC);
3491
3492                 if ( i < info->tx_buf_count - 1 )
3493                         info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3494         }
3495
3496         return 0;
3497 }
3498
3499 /* Allocate the frame DMA buffers used by the specified buffer list.
3500  */
3501 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3502 {
3503         int i;
3504         unsigned long phys_addr;
3505
3506         for ( i = 0; i < count; i++ ) {
3507                 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3508                 phys_addr = info->port_array[0]->last_mem_alloc;
3509                 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3510
3511                 buf_list[i].buf_ptr  = (unsigned short)phys_addr;
3512                 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3513         }
3514
3515         return 0;
3516 }
3517
3518 static void free_dma_bufs(SLMP_INFO *info)
3519 {
3520         info->buffer_list = NULL;
3521         info->rx_buf_list = NULL;
3522         info->tx_buf_list = NULL;
3523 }
3524
3525 /* allocate buffer large enough to hold max_frame_size.
3526  * This buffer is used to pass an assembled frame to the line discipline.
3527  */
3528 static int alloc_tmp_rx_buf(SLMP_INFO *info)
3529 {
3530         info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3531         if (info->tmp_rx_buf == NULL)
3532                 return -ENOMEM;
3533         /* unused flag buffer to satisfy receive_buf calling interface */
3534         info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
3535         if (!info->flag_buf) {
3536                 kfree(info->tmp_rx_buf);
3537                 info->tmp_rx_buf = NULL;
3538                 return -ENOMEM;
3539         }
3540         return 0;
3541 }
3542
3543 static void free_tmp_rx_buf(SLMP_INFO *info)
3544 {
3545         kfree(info->tmp_rx_buf);
3546         info->tmp_rx_buf = NULL;
3547         kfree(info->flag_buf);
3548         info->flag_buf = NULL;
3549 }
3550
3551 static int claim_resources(SLMP_INFO *info)
3552 {
3553         if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3554                 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3555                         __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3556                 info->init_error = DiagStatus_AddressConflict;
3557                 goto errout;
3558         }
3559         else
3560                 info->shared_mem_requested = true;
3561
3562         if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3563                 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3564                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3565                 info->init_error = DiagStatus_AddressConflict;
3566                 goto errout;
3567         }
3568         else
3569                 info->lcr_mem_requested = true;
3570
3571         if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3572                 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3573                         __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3574                 info->init_error = DiagStatus_AddressConflict;
3575                 goto errout;
3576         }
3577         else
3578                 info->sca_base_requested = true;
3579
3580         if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3581                 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3582                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3583                 info->init_error = DiagStatus_AddressConflict;
3584                 goto errout;
3585         }
3586         else
3587                 info->sca_statctrl_requested = true;
3588
3589         info->memory_base = ioremap_nocache(info->phys_memory_base,
3590                                                                 SCA_MEM_SIZE);
3591         if (!info->memory_base) {
3592                 printk( "%s(%d):%s Can't map shared memory, MemAddr=%08X\n",
3593                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3594                 info->init_error = DiagStatus_CantAssignPciResources;
3595                 goto errout;
3596         }
3597
3598         info->lcr_base = ioremap_nocache(info->phys_lcr_base, PAGE_SIZE);
3599         if (!info->lcr_base) {
3600                 printk( "%s(%d):%s Can't map LCR memory, MemAddr=%08X\n",
3601                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3602                 info->init_error = DiagStatus_CantAssignPciResources;
3603                 goto errout;
3604         }
3605         info->lcr_base += info->lcr_offset;
3606
3607         info->sca_base = ioremap_nocache(info->phys_sca_base, PAGE_SIZE);
3608         if (!info->sca_base) {
3609                 printk( "%s(%d):%s Can't map SCA memory, MemAddr=%08X\n",
3610                         __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3611                 info->init_error = DiagStatus_CantAssignPciResources;
3612                 goto errout;
3613         }
3614         info->sca_base += info->sca_offset;
3615
3616         info->statctrl_base = ioremap_nocache(info->phys_statctrl_base,
3617                                                                 PAGE_SIZE);
3618         if (!info->statctrl_base) {
3619                 printk( "%s(%d):%s Can't map SCA Status/Control memory, MemAddr=%08X\n",
3620                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3621                 info->init_error = DiagStatus_CantAssignPciResources;
3622                 goto errout;
3623         }
3624         info->statctrl_base += info->statctrl_offset;
3625
3626         if ( !memory_test(info) ) {
3627                 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3628                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3629                 info->init_error = DiagStatus_MemoryError;
3630                 goto errout;
3631         }
3632
3633         return 0;
3634
3635 errout:
3636         release_resources( info );
3637         return -ENODEV;
3638 }
3639
3640 static void release_resources(SLMP_INFO *info)
3641 {
3642         if ( debug_level >= DEBUG_LEVEL_INFO )
3643                 printk( "%s(%d):%s release_resources() entry\n",
3644                         __FILE__,__LINE__,info->device_name );
3645
3646         if ( info->irq_requested ) {
3647                 free_irq(info->irq_level, info);
3648                 info->irq_requested = false;
3649         }
3650
3651         if ( info->shared_mem_requested ) {
3652                 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3653                 info->shared_mem_requested = false;
3654         }
3655         if ( info->lcr_mem_requested ) {
3656                 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3657                 info->lcr_mem_requested = false;
3658         }
3659         if ( info->sca_base_requested ) {
3660                 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3661                 info->sca_base_requested = false;
3662         }
3663         if ( info->sca_statctrl_requested ) {
3664                 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3665                 info->sca_statctrl_requested = false;
3666         }
3667
3668         if (info->memory_base){
3669                 iounmap(info->memory_base);
3670                 info->memory_base = NULL;
3671         }
3672
3673         if (info->sca_base) {
3674                 iounmap(info->sca_base - info->sca_offset);
3675                 info->sca_base=NULL;
3676         }
3677
3678         if (info->statctrl_base) {
3679                 iounmap(info->statctrl_base - info->statctrl_offset);
3680                 info->statctrl_base=NULL;
3681         }
3682
3683         if (info->lcr_base){
3684                 iounmap(info->lcr_base - info->lcr_offset);
3685                 info->lcr_base = NULL;
3686         }
3687
3688         if ( debug_level >= DEBUG_LEVEL_INFO )
3689                 printk( "%s(%d):%s release_resources() exit\n",
3690                         __FILE__,__LINE__,info->device_name );
3691 }
3692
3693 /* Add the specified device instance data structure to the
3694  * global linked list of devices and increment the device count.
3695  */
3696 static void add_device(SLMP_INFO *info)
3697 {
3698         info->next_device = NULL;
3699         info->line = synclinkmp_device_count;
3700         sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3701
3702         if (info->line < MAX_DEVICES) {
3703                 if (maxframe[info->line])
3704                         info->max_frame_size = maxframe[info->line];
3705         }
3706
3707         synclinkmp_device_count++;
3708
3709         if ( !synclinkmp_device_list )
3710                 synclinkmp_device_list = info;
3711         else {
3712                 SLMP_INFO *current_dev = synclinkmp_device_list;
3713                 while( current_dev->next_device )
3714                         current_dev = current_dev->next_device;
3715                 current_dev->next_device = info;
3716         }
3717
3718         if ( info->max_frame_size < 4096 )
3719                 info->max_frame_size = 4096;
3720         else if ( info->max_frame_size > 65535 )
3721                 info->max_frame_size = 65535;
3722
3723         printk( "SyncLink MultiPort %s: "
3724                 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3725                 info->device_name,
3726                 info->phys_sca_base,
3727                 info->phys_memory_base,
3728                 info->phys_statctrl_base,
3729                 info->phys_lcr_base,
3730                 info->irq_level,
3731                 info->max_frame_size );
3732
3733 #if SYNCLINK_GENERIC_HDLC
3734         hdlcdev_init(info);
3735 #endif
3736 }
3737
3738 static const struct tty_port_operations port_ops = {
3739         .carrier_raised = carrier_raised,
3740         .dtr_rts = dtr_rts,
3741 };
3742
3743 /* Allocate and initialize a device instance structure
3744  *
3745  * Return Value:        pointer to SLMP_INFO if success, otherwise NULL
3746  */
3747 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3748 {
3749         SLMP_INFO *info;
3750
3751         info = kzalloc(sizeof(SLMP_INFO),
3752                  GFP_KERNEL);
3753
3754         if (!info) {
3755                 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3756                         __FILE__,__LINE__, adapter_num, port_num);
3757         } else {
3758                 tty_port_init(&info->port);
3759                 info->port.ops = &port_ops;
3760                 info->magic = MGSL_MAGIC;
3761                 INIT_WORK(&info->task, bh_handler);
3762                 info->max_frame_size = 4096;
3763                 info->port.close_delay = 5*HZ/10;
3764                 info->port.closing_wait = 30*HZ;
3765                 init_waitqueue_head(&info->status_event_wait_q);
3766                 init_waitqueue_head(&info->event_wait_q);
3767                 spin_lock_init(&info->netlock);
3768                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3769                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3770                 info->adapter_num = adapter_num;
3771                 info->port_num = port_num;
3772
3773                 /* Copy configuration info to device instance data */
3774                 info->irq_level = pdev->irq;
3775                 info->phys_lcr_base = pci_resource_start(pdev,0);
3776                 info->phys_sca_base = pci_resource_start(pdev,2);
3777                 info->phys_memory_base = pci_resource_start(pdev,3);
3778                 info->phys_statctrl_base = pci_resource_start(pdev,4);
3779
3780                 /* Because veremap only works on page boundaries we must map
3781                  * a larger area than is actually implemented for the LCR
3782                  * memory range. We map a full page starting at the page boundary.
3783                  */
3784                 info->lcr_offset    = info->phys_lcr_base & (PAGE_SIZE-1);
3785                 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3786
3787                 info->sca_offset    = info->phys_sca_base & (PAGE_SIZE-1);
3788                 info->phys_sca_base &= ~(PAGE_SIZE-1);
3789
3790                 info->statctrl_offset    = info->phys_statctrl_base & (PAGE_SIZE-1);
3791                 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3792
3793                 info->bus_type = MGSL_BUS_TYPE_PCI;
3794                 info->irq_flags = IRQF_SHARED;
3795
3796                 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3797                 setup_timer(&info->status_timer, status_timeout,
3798                                 (unsigned long)info);
3799
3800                 /* Store the PCI9050 misc control register value because a flaw
3801                  * in the PCI9050 prevents LCR registers from being read if
3802                  * BIOS assigns an LCR base address with bit 7 set.
3803                  *
3804                  * Only the misc control register is accessed for which only
3805                  * write access is needed, so set an initial value and change
3806                  * bits to the device instance data as we write the value
3807                  * to the actual misc control register.
3808                  */
3809                 info->misc_ctrl_value = 0x087e4546;
3810
3811                 /* initial port state is unknown - if startup errors
3812                  * occur, init_error will be set to indicate the
3813                  * problem. Once the port is fully initialized,
3814                  * this value will be set to 0 to indicate the
3815                  * port is available.
3816                  */
3817                 info->init_error = -1;
3818         }
3819
3820         return info;
3821 }
3822
3823 static void device_init(int adapter_num, struct pci_dev *pdev)
3824 {
3825         SLMP_INFO *port_array[SCA_MAX_PORTS];
3826         int port;
3827
3828         /* allocate device instances for up to SCA_MAX_PORTS devices */
3829         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3830                 port_array[port] = alloc_dev(adapter_num,port,pdev);
3831                 if( port_array[port] == NULL ) {
3832                         for (--port; port >= 0; --port) {
3833                                 tty_port_destroy(&port_array[port]->port);
3834                                 kfree(port_array[port]);
3835                         }
3836                         return;
3837                 }
3838         }
3839
3840         /* give copy of port_array to all ports and add to device list  */
3841         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3842                 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3843                 add_device( port_array[port] );
3844                 spin_lock_init(&port_array[port]->lock);
3845         }
3846
3847         /* Allocate and claim adapter resources */
3848         if ( !claim_resources(port_array[0]) ) {
3849
3850                 alloc_dma_bufs(port_array[0]);
3851
3852                 /* copy resource information from first port to others */
3853                 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3854                         port_array[port]->lock  = port_array[0]->lock;
3855                         port_array[port]->irq_level     = port_array[0]->irq_level;
3856                         port_array[port]->memory_base   = port_array[0]->memory_base;
3857                         port_array[port]->sca_base      = port_array[0]->sca_base;
3858                         port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3859                         port_array[port]->lcr_base      = port_array[0]->lcr_base;
3860                         alloc_dma_bufs(port_array[port]);
3861                 }
3862
3863                 if ( request_irq(port_array[0]->irq_level,
3864                                         synclinkmp_interrupt,
3865                                         port_array[0]->irq_flags,
3866                                         port_array[0]->device_name,
3867                                         port_array[0]) < 0 ) {
3868                         printk( "%s(%d):%s Can't request interrupt, IRQ=%d\n",
3869                                 __FILE__,__LINE__,
3870                                 port_array[0]->device_name,
3871                                 port_array[0]->irq_level );
3872                 }
3873                 else {
3874                         port_array[0]->irq_requested = true;
3875                         adapter_test(port_array[0]);
3876                 }
3877         }
3878 }
3879
3880 static const struct tty_operations ops = {
3881         .install = install,
3882         .open = open,
3883         .close = close,
3884         .write = write,
3885         .put_char = put_char,
3886         .flush_chars = flush_chars,
3887         .write_room = write_room,
3888         .chars_in_buffer = chars_in_buffer,
3889         .flush_buffer = flush_buffer,
3890         .ioctl = ioctl,
3891         .throttle = throttle,
3892         .unthrottle = unthrottle,
3893         .send_xchar = send_xchar,
3894         .break_ctl = set_break,
3895         .wait_until_sent = wait_until_sent,
3896         .set_termios = set_termios,
3897         .stop = tx_hold,
3898         .start = tx_release,
3899         .hangup = hangup,
3900         .tiocmget = tiocmget,
3901         .tiocmset = tiocmset,
3902         .get_icount = get_icount,
3903         .proc_fops = &synclinkmp_proc_fops,
3904 };
3905
3906
3907 static void synclinkmp_cleanup(void)
3908 {
3909         int rc;
3910         SLMP_INFO *info;
3911         SLMP_INFO *tmp;
3912
3913         printk("Unloading %s %s\n", driver_name, driver_version);
3914
3915         if (serial_driver) {
3916                 rc = tty_unregister_driver(serial_driver);
3917                 if (rc)
3918                         printk("%s(%d) failed to unregister tty driver err=%d\n",
3919                                __FILE__,__LINE__,rc);
3920                 put_tty_driver(serial_driver);
3921         }
3922
3923         /* reset devices */
3924         info = synclinkmp_device_list;
3925         while(info) {
3926                 reset_port(info);
3927                 info = info->next_device;
3928         }
3929
3930         /* release devices */
3931         info = synclinkmp_device_list;
3932         while(info) {
3933 #if SYNCLINK_GENERIC_HDLC
3934                 hdlcdev_exit(info);
3935 #endif
3936                 free_dma_bufs(info);
3937                 free_tmp_rx_buf(info);
3938                 if ( info->port_num == 0 ) {
3939                         if (info->sca_base)
3940                                 write_reg(info, LPR, 1); /* set low power mode */
3941                         release_resources(info);
3942                 }
3943                 tmp = info;
3944                 info = info->next_device;
3945                 tty_port_destroy(&tmp->port);
3946                 kfree(tmp);
3947         }
3948
3949         pci_unregister_driver(&synclinkmp_pci_driver);
3950 }
3951
3952 /* Driver initialization entry point.
3953  */
3954
3955 static int __init synclinkmp_init(void)
3956 {
3957         int rc;
3958
3959         if (break_on_load) {
3960                 synclinkmp_get_text_ptr();
3961                 BREAKPOINT();
3962         }
3963
3964         printk("%s %s\n", driver_name, driver_version);
3965
3966         if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
3967                 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
3968                 return rc;
3969         }
3970
3971         serial_driver = alloc_tty_driver(128);
3972         if (!serial_driver) {
3973                 rc = -ENOMEM;
3974                 goto error;
3975         }
3976
3977         /* Initialize the tty_driver structure */
3978
3979         serial_driver->driver_name = "synclinkmp";
3980         serial_driver->name = "ttySLM";
3981         serial_driver->major = ttymajor;
3982         serial_driver->minor_start = 64;
3983         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3984         serial_driver->subtype = SERIAL_TYPE_NORMAL;
3985         serial_driver->init_termios = tty_std_termios;
3986         serial_driver->init_termios.c_cflag =
3987                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3988         serial_driver->init_termios.c_ispeed = 9600;
3989         serial_driver->init_termios.c_ospeed = 9600;
3990         serial_driver->flags = TTY_DRIVER_REAL_RAW;
3991         tty_set_operations(serial_driver, &ops);
3992         if ((rc = tty_register_driver(serial_driver)) < 0) {
3993                 printk("%s(%d):Couldn't register serial driver\n",
3994                         __FILE__,__LINE__);
3995                 put_tty_driver(serial_driver);
3996                 serial_driver = NULL;
3997                 goto error;
3998         }
3999
4000         printk("%s %s, tty major#%d\n",
4001                 driver_name, driver_version,
4002                 serial_driver->major);
4003
4004         return 0;
4005
4006 error:
4007         synclinkmp_cleanup();
4008         return rc;
4009 }
4010
4011 static void __exit synclinkmp_exit(void)
4012 {
4013         synclinkmp_cleanup();
4014 }
4015
4016 module_init(synclinkmp_init);
4017 module_exit(synclinkmp_exit);
4018
4019 /* Set the port for internal loopback mode.
4020  * The TxCLK and RxCLK signals are generated from the BRG and
4021  * the TxD is looped back to the RxD internally.
4022  */
4023 static void enable_loopback(SLMP_INFO *info, int enable)
4024 {
4025         if (enable) {
4026                 /* MD2 (Mode Register 2)
4027                  * 01..00  CNCT<1..0> Channel Connection 11=Local Loopback
4028                  */
4029                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4030
4031                 /* degate external TxC clock source */
4032                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4033                 write_control_reg(info);
4034
4035                 /* RXS/TXS (Rx/Tx clock source)
4036                  * 07      Reserved, must be 0
4037                  * 06..04  Clock Source, 100=BRG
4038                  * 03..00  Clock Divisor, 0000=1
4039                  */
4040                 write_reg(info, RXS, 0x40);
4041                 write_reg(info, TXS, 0x40);
4042
4043         } else {
4044                 /* MD2 (Mode Register 2)
4045                  * 01..00  CNCT<1..0> Channel connection, 0=normal
4046                  */
4047                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4048
4049                 /* RXS/TXS (Rx/Tx clock source)
4050                  * 07      Reserved, must be 0
4051                  * 06..04  Clock Source, 000=RxC/TxC Pin
4052                  * 03..00  Clock Divisor, 0000=1
4053                  */
4054                 write_reg(info, RXS, 0x00);
4055                 write_reg(info, TXS, 0x00);
4056         }
4057
4058         /* set LinkSpeed if available, otherwise default to 2Mbps */
4059         if (info->params.clock_speed)
4060                 set_rate(info, info->params.clock_speed);
4061         else
4062                 set_rate(info, 3686400);
4063 }
4064
4065 /* Set the baud rate register to the desired speed
4066  *
4067  *      data_rate       data rate of clock in bits per second
4068  *                      A data rate of 0 disables the AUX clock.
4069  */
4070 static void set_rate( SLMP_INFO *info, u32 data_rate )
4071 {
4072         u32 TMCValue;
4073         unsigned char BRValue;
4074         u32 Divisor=0;
4075
4076         /* fBRG = fCLK/(TMC * 2^BR)
4077          */
4078         if (data_rate != 0) {
4079                 Divisor = 14745600/data_rate;
4080                 if (!Divisor)
4081                         Divisor = 1;
4082
4083                 TMCValue = Divisor;
4084
4085                 BRValue = 0;
4086                 if (TMCValue != 1 && TMCValue != 2) {
4087                         /* BRValue of 0 provides 50/50 duty cycle *only* when
4088                          * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4089                          * 50/50 duty cycle.
4090                          */
4091                         BRValue = 1;
4092                         TMCValue >>= 1;
4093                 }
4094
4095                 /* while TMCValue is too big for TMC register, divide
4096                  * by 2 and increment BR exponent.
4097                  */
4098                 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4099                         TMCValue >>= 1;
4100
4101                 write_reg(info, TXS,
4102                         (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4103                 write_reg(info, RXS,
4104                         (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4105                 write_reg(info, TMC, (unsigned char)TMCValue);
4106         }
4107         else {
4108                 write_reg(info, TXS,0);
4109                 write_reg(info, RXS,0);
4110                 write_reg(info, TMC, 0);
4111         }
4112 }
4113
4114 /* Disable receiver
4115  */
4116 static void rx_stop(SLMP_INFO *info)
4117 {
4118         if (debug_level >= DEBUG_LEVEL_ISR)
4119                 printk("%s(%d):%s rx_stop()\n",
4120                          __FILE__,__LINE__, info->device_name );
4121
4122         write_reg(info, CMD, RXRESET);
4123
4124         info->ie0_value &= ~RXRDYE;
4125         write_reg(info, IE0, info->ie0_value);  /* disable Rx data interrupts */
4126
4127         write_reg(info, RXDMA + DSR, 0);        /* disable Rx DMA */
4128         write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4129         write_reg(info, RXDMA + DIR, 0);        /* disable Rx DMA interrupts */
4130
4131         info->rx_enabled = false;
4132         info->rx_overflow = false;
4133 }
4134
4135 /* enable the receiver
4136  */
4137 static void rx_start(SLMP_INFO *info)
4138 {
4139         int i;
4140
4141         if (debug_level >= DEBUG_LEVEL_ISR)
4142                 printk("%s(%d):%s rx_start()\n",
4143                          __FILE__,__LINE__, info->device_name );
4144
4145         write_reg(info, CMD, RXRESET);
4146
4147         if ( info->params.mode == MGSL_MODE_HDLC ) {
4148                 /* HDLC, disabe IRQ on rxdata */
4149                 info->ie0_value &= ~RXRDYE;
4150                 write_reg(info, IE0, info->ie0_value);
4151
4152                 /* Reset all Rx DMA buffers and program rx dma */
4153                 write_reg(info, RXDMA + DSR, 0);                /* disable Rx DMA */
4154                 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4155
4156                 for (i = 0; i < info->rx_buf_count; i++) {
4157                         info->rx_buf_list[i].status = 0xff;
4158
4159                         // throttle to 4 shared memory writes at a time to prevent
4160                         // hogging local bus (keep latency time for DMA requests low).
4161                         if (!(i % 4))
4162                                 read_status_reg(info);
4163                 }
4164                 info->current_rx_buf = 0;
4165
4166                 /* set current/1st descriptor address */
4167                 write_reg16(info, RXDMA + CDA,
4168                         info->rx_buf_list_ex[0].phys_entry);
4169
4170                 /* set new last rx descriptor address */
4171                 write_reg16(info, RXDMA + EDA,
4172                         info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4173
4174                 /* set buffer length (shared by all rx dma data buffers) */
4175                 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4176
4177                 write_reg(info, RXDMA + DIR, 0x60);     /* enable Rx DMA interrupts (EOM/BOF) */
4178                 write_reg(info, RXDMA + DSR, 0xf2);     /* clear Rx DMA IRQs, enable Rx DMA */
4179         } else {
4180                 /* async, enable IRQ on rxdata */
4181                 info->ie0_value |= RXRDYE;
4182                 write_reg(info, IE0, info->ie0_value);
4183         }
4184
4185         write_reg(info, CMD, RXENABLE);
4186
4187         info->rx_overflow = false;
4188         info->rx_enabled = true;
4189 }
4190
4191 /* Enable the transmitter and send a transmit frame if
4192  * one is loaded in the DMA buffers.
4193  */
4194 static void tx_start(SLMP_INFO *info)
4195 {
4196         if (debug_level >= DEBUG_LEVEL_ISR)
4197                 printk("%s(%d):%s tx_start() tx_count=%d\n",
4198                          __FILE__,__LINE__, info->device_name,info->tx_count );
4199
4200         if (!info->tx_enabled ) {
4201                 write_reg(info, CMD, TXRESET);
4202                 write_reg(info, CMD, TXENABLE);
4203                 info->tx_enabled = true;
4204         }
4205
4206         if ( info->tx_count ) {
4207
4208                 /* If auto RTS enabled and RTS is inactive, then assert */
4209                 /* RTS and set a flag indicating that the driver should */
4210                 /* negate RTS when the transmission completes. */
4211
4212                 info->drop_rts_on_tx_done = false;
4213
4214                 if (info->params.mode != MGSL_MODE_ASYNC) {
4215
4216                         if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4217                                 get_signals( info );
4218                                 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4219                                         info->serial_signals |= SerialSignal_RTS;
4220                                         set_signals( info );
4221                                         info->drop_rts_on_tx_done = true;
4222                                 }
4223                         }
4224
4225                         write_reg16(info, TRC0,
4226                                 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4227
4228                         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4229                         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4230
4231                         /* set TX CDA (current descriptor address) */
4232                         write_reg16(info, TXDMA + CDA,
4233                                 info->tx_buf_list_ex[0].phys_entry);
4234
4235                         /* set TX EDA (last descriptor address) */
4236                         write_reg16(info, TXDMA + EDA,
4237                                 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4238
4239                         /* enable underrun IRQ */
4240                         info->ie1_value &= ~IDLE;
4241                         info->ie1_value |= UDRN;
4242                         write_reg(info, IE1, info->ie1_value);
4243                         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4244
4245                         write_reg(info, TXDMA + DIR, 0x40);             /* enable Tx DMA interrupts (EOM) */
4246                         write_reg(info, TXDMA + DSR, 0xf2);             /* clear Tx DMA IRQs, enable Tx DMA */
4247
4248                         mod_timer(&info->tx_timer, jiffies +
4249                                         msecs_to_jiffies(5000));
4250                 }
4251                 else {
4252                         tx_load_fifo(info);
4253                         /* async, enable IRQ on txdata */
4254                         info->ie0_value |= TXRDYE;
4255                         write_reg(info, IE0, info->ie0_value);
4256                 }
4257
4258                 info->tx_active = true;
4259         }
4260 }
4261
4262 /* stop the transmitter and DMA
4263  */
4264 static void tx_stop( SLMP_INFO *info )
4265 {
4266         if (debug_level >= DEBUG_LEVEL_ISR)
4267                 printk("%s(%d):%s tx_stop()\n",
4268                          __FILE__,__LINE__, info->device_name );
4269
4270         del_timer(&info->tx_timer);
4271
4272         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4273         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4274
4275         write_reg(info, CMD, TXRESET);
4276
4277         info->ie1_value &= ~(UDRN + IDLE);
4278         write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
4279         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
4280
4281         info->ie0_value &= ~TXRDYE;
4282         write_reg(info, IE0, info->ie0_value);  /* disable tx data interrupts */
4283
4284         info->tx_enabled = false;
4285         info->tx_active = false;
4286 }
4287
4288 /* Fill the transmit FIFO until the FIFO is full or
4289  * there is no more data to load.
4290  */
4291 static void tx_load_fifo(SLMP_INFO *info)
4292 {
4293         u8 TwoBytes[2];
4294
4295         /* do nothing is now tx data available and no XON/XOFF pending */
4296
4297         if ( !info->tx_count && !info->x_char )
4298                 return;
4299
4300         /* load the Transmit FIFO until FIFOs full or all data sent */
4301
4302         while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4303
4304                 /* there is more space in the transmit FIFO and */
4305                 /* there is more data in transmit buffer */
4306
4307                 if ( (info->tx_count > 1) && !info->x_char ) {
4308                         /* write 16-bits */
4309                         TwoBytes[0] = info->tx_buf[info->tx_get++];
4310                         if (info->tx_get >= info->max_frame_size)
4311                                 info->tx_get -= info->max_frame_size;
4312                         TwoBytes[1] = info->tx_buf[info->tx_get++];
4313                         if (info->tx_get >= info->max_frame_size)
4314                                 info->tx_get -= info->max_frame_size;
4315
4316                         write_reg16(info, TRB, *((u16 *)TwoBytes));
4317
4318                         info->tx_count -= 2;
4319                         info->icount.tx += 2;
4320                 } else {
4321                         /* only 1 byte left to transmit or 1 FIFO slot left */
4322
4323                         if (info->x_char) {
4324                                 /* transmit pending high priority char */
4325                                 write_reg(info, TRB, info->x_char);
4326                                 info->x_char = 0;
4327                         } else {
4328                                 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4329                                 if (info->tx_get >= info->max_frame_size)
4330                                         info->tx_get -= info->max_frame_size;
4331                                 info->tx_count--;
4332                         }
4333                         info->icount.tx++;
4334                 }
4335         }
4336 }
4337
4338 /* Reset a port to a known state
4339  */
4340 static void reset_port(SLMP_INFO *info)
4341 {
4342         if (info->sca_base) {
4343
4344                 tx_stop(info);
4345                 rx_stop(info);
4346
4347                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
4348                 set_signals(info);
4349
4350                 /* disable all port interrupts */
4351                 info->ie0_value = 0;
4352                 info->ie1_value = 0;
4353                 info->ie2_value = 0;
4354                 write_reg(info, IE0, info->ie0_value);
4355                 write_reg(info, IE1, info->ie1_value);
4356                 write_reg(info, IE2, info->ie2_value);
4357
4358                 write_reg(info, CMD, CHRESET);
4359         }
4360 }
4361
4362 /* Reset all the ports to a known state.
4363  */
4364 static void reset_adapter(SLMP_INFO *info)
4365 {
4366         int i;
4367
4368         for ( i=0; i < SCA_MAX_PORTS; ++i) {
4369                 if (info->port_array[i])
4370                         reset_port(info->port_array[i]);
4371         }
4372 }
4373
4374 /* Program port for asynchronous communications.
4375  */
4376 static void async_mode(SLMP_INFO *info)
4377 {
4378
4379         unsigned char RegValue;
4380
4381         tx_stop(info);
4382         rx_stop(info);
4383
4384         /* MD0, Mode Register 0
4385          *
4386          * 07..05  PRCTL<2..0>, Protocol Mode, 000=async
4387          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4388          * 03      Reserved, must be 0
4389          * 02      CRCCC, CRC Calculation, 0=disabled
4390          * 01..00  STOP<1..0> Stop bits (00=1,10=2)
4391          *
4392          * 0000 0000
4393          */
4394         RegValue = 0x00;
4395         if (info->params.stop_bits != 1)
4396                 RegValue |= BIT1;
4397         write_reg(info, MD0, RegValue);
4398
4399         /* MD1, Mode Register 1
4400          *
4401          * 07..06  BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4402          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4403          * 03..02  RXCHR<1..0>, rx char size
4404          * 01..00  PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4405          *
4406          * 0100 0000
4407          */
4408         RegValue = 0x40;
4409         switch (info->params.data_bits) {
4410         case 7: RegValue |= BIT4 + BIT2; break;
4411         case 6: RegValue |= BIT5 + BIT3; break;
4412         case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4413         }
4414         if (info->params.parity != ASYNC_PARITY_NONE) {
4415                 RegValue |= BIT1;
4416                 if (info->params.parity == ASYNC_PARITY_ODD)
4417                         RegValue |= BIT0;
4418         }
4419         write_reg(info, MD1, RegValue);
4420
4421         /* MD2, Mode Register 2
4422          *
4423          * 07..02  Reserved, must be 0
4424          * 01..00  CNCT<1..0> Channel connection, 00=normal 11=local loopback
4425          *
4426          * 0000 0000
4427          */
4428         RegValue = 0x00;
4429         if (info->params.loopback)
4430                 RegValue |= (BIT1 + BIT0);
4431         write_reg(info, MD2, RegValue);
4432
4433         /* RXS, Receive clock source
4434          *
4435          * 07      Reserved, must be 0
4436          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4437          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4438          */
4439         RegValue=BIT6;
4440         write_reg(info, RXS, RegValue);
4441
4442         /* TXS, Transmit clock source
4443          *
4444          * 07      Reserved, must be 0
4445          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4446          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4447          */
4448         RegValue=BIT6;
4449         write_reg(info, TXS, RegValue);
4450
4451         /* Control Register
4452          *
4453          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4454          */
4455         info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4456         write_control_reg(info);
4457
4458         tx_set_idle(info);
4459
4460         /* RRC Receive Ready Control 0
4461          *
4462          * 07..05  Reserved, must be 0
4463          * 04..00  RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4464          */
4465         write_reg(info, RRC, 0x00);
4466
4467         /* TRC0 Transmit Ready Control 0
4468          *
4469          * 07..05  Reserved, must be 0
4470          * 04..00  TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4471          */
4472         write_reg(info, TRC0, 0x10);
4473
4474         /* TRC1 Transmit Ready Control 1
4475          *
4476          * 07..05  Reserved, must be 0
4477          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4478          */
4479         write_reg(info, TRC1, 0x1e);
4480
4481         /* CTL, MSCI control register
4482          *
4483          * 07..06  Reserved, set to 0
4484          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4485          * 04      IDLC, idle control, 0=mark 1=idle register
4486          * 03      BRK, break, 0=off 1 =on (async)
4487          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4488          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4489          * 00      RTS, RTS output control, 0=active 1=inactive
4490          *
4491          * 0001 0001
4492          */
4493         RegValue = 0x10;
4494         if (!(info->serial_signals & SerialSignal_RTS))
4495                 RegValue |= 0x01;
4496         write_reg(info, CTL, RegValue);
4497
4498         /* enable status interrupts */
4499         info->ie0_value |= TXINTE + RXINTE;
4500         write_reg(info, IE0, info->ie0_value);
4501
4502         /* enable break detect interrupt */
4503         info->ie1_value = BRKD;
4504         write_reg(info, IE1, info->ie1_value);
4505
4506         /* enable rx overrun interrupt */
4507         info->ie2_value = OVRN;
4508         write_reg(info, IE2, info->ie2_value);
4509
4510         set_rate( info, info->params.data_rate * 16 );
4511 }
4512
4513 /* Program the SCA for HDLC communications.
4514  */
4515 static void hdlc_mode(SLMP_INFO *info)
4516 {
4517         unsigned char RegValue;
4518         u32 DpllDivisor;
4519
4520         // Can't use DPLL because SCA outputs recovered clock on RxC when
4521         // DPLL mode selected. This causes output contention with RxC receiver.
4522         // Use of DPLL would require external hardware to disable RxC receiver
4523         // when DPLL mode selected.
4524         info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4525
4526         /* disable DMA interrupts */
4527         write_reg(info, TXDMA + DIR, 0);
4528         write_reg(info, RXDMA + DIR, 0);
4529
4530         /* MD0, Mode Register 0
4531          *
4532          * 07..05  PRCTL<2..0>, Protocol Mode, 100=HDLC
4533          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4534          * 03      Reserved, must be 0
4535          * 02      CRCCC, CRC Calculation, 1=enabled
4536          * 01      CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4537          * 00      CRC0, CRC initial value, 1 = all 1s
4538          *
4539          * 1000 0001
4540          */
4541         RegValue = 0x81;
4542         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4543                 RegValue |= BIT4;
4544         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4545                 RegValue |= BIT4;
4546         if (info->params.crc_type == HDLC_CRC_16_CCITT)
4547                 RegValue |= BIT2 + BIT1;
4548         write_reg(info, MD0, RegValue);
4549
4550         /* MD1, Mode Register 1
4551          *
4552          * 07..06  ADDRS<1..0>, Address detect, 00=no addr check
4553          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits
4554          * 03..02  RXCHR<1..0>, rx char size, 00=8 bits
4555          * 01..00  PMPM<1..0>, Parity mode, 00=no parity
4556          *
4557          * 0000 0000
4558          */
4559         RegValue = 0x00;
4560         write_reg(info, MD1, RegValue);
4561
4562         /* MD2, Mode Register 2
4563          *
4564          * 07      NRZFM, 0=NRZ, 1=FM
4565          * 06..05  CODE<1..0> Encoding, 00=NRZ
4566          * 04..03  DRATE<1..0> DPLL Divisor, 00=8
4567          * 02      Reserved, must be 0
4568          * 01..00  CNCT<1..0> Channel connection, 0=normal
4569          *
4570          * 0000 0000
4571          */
4572         RegValue = 0x00;
4573         switch(info->params.encoding) {
4574         case HDLC_ENCODING_NRZI:          RegValue |= BIT5; break;
4575         case HDLC_ENCODING_BIPHASE_MARK:  RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4576         case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4577         case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break;      /* aka Manchester */
4578 #if 0
4579         case HDLC_ENCODING_NRZB:                                        /* not supported */
4580         case HDLC_ENCODING_NRZI_MARK:                                   /* not supported */
4581         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:                          /* not supported */
4582 #endif
4583         }
4584         if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4585                 DpllDivisor = 16;
4586                 RegValue |= BIT3;
4587         } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4588                 DpllDivisor = 8;
4589         } else {
4590                 DpllDivisor = 32;
4591                 RegValue |= BIT4;
4592         }
4593         write_reg(info, MD2, RegValue);
4594
4595
4596         /* RXS, Receive clock source
4597          *
4598          * 07      Reserved, must be 0
4599          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4600          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4601          */
4602         RegValue=0;
4603         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4604                 RegValue |= BIT6;
4605         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4606                 RegValue |= BIT6 + BIT5;
4607         write_reg(info, RXS, RegValue);
4608
4609         /* TXS, Transmit clock source
4610          *
4611          * 07      Reserved, must be 0
4612          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4613          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4614          */
4615         RegValue=0;
4616         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4617                 RegValue |= BIT6;
4618         if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4619                 RegValue |= BIT6 + BIT5;
4620         write_reg(info, TXS, RegValue);
4621
4622         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4623                 set_rate(info, info->params.clock_speed * DpllDivisor);
4624         else
4625                 set_rate(info, info->params.clock_speed);
4626
4627         /* GPDATA (General Purpose I/O Data Register)
4628          *
4629          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4630          */
4631         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4632                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4633         else
4634                 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4635         write_control_reg(info);
4636
4637         /* RRC Receive Ready Control 0
4638          *
4639          * 07..05  Reserved, must be 0
4640          * 04..00  RRC<4..0> Rx FIFO trigger active
4641          */
4642         write_reg(info, RRC, rx_active_fifo_level);
4643
4644         /* TRC0 Transmit Ready Control 0
4645          *
4646          * 07..05  Reserved, must be 0
4647          * 04..00  TRC<4..0> Tx FIFO trigger active
4648          */
4649         write_reg(info, TRC0, tx_active_fifo_level);
4650
4651         /* TRC1 Transmit Ready Control 1
4652          *
4653          * 07..05  Reserved, must be 0
4654          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4655          */
4656         write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4657
4658         /* DMR, DMA Mode Register
4659          *
4660          * 07..05  Reserved, must be 0
4661          * 04      TMOD, Transfer Mode: 1=chained-block
4662          * 03      Reserved, must be 0
4663          * 02      NF, Number of Frames: 1=multi-frame
4664          * 01      CNTE, Frame End IRQ Counter enable: 0=disabled
4665          * 00      Reserved, must be 0
4666          *
4667          * 0001 0100
4668          */
4669         write_reg(info, TXDMA + DMR, 0x14);
4670         write_reg(info, RXDMA + DMR, 0x14);
4671
4672         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4673         write_reg(info, RXDMA + CPB,
4674                 (unsigned char)(info->buffer_list_phys >> 16));
4675
4676         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4677         write_reg(info, TXDMA + CPB,
4678                 (unsigned char)(info->buffer_list_phys >> 16));
4679
4680         /* enable status interrupts. other code enables/disables
4681          * the individual sources for these two interrupt classes.
4682          */
4683         info->ie0_value |= TXINTE + RXINTE;
4684         write_reg(info, IE0, info->ie0_value);
4685
4686         /* CTL, MSCI control register
4687          *
4688          * 07..06  Reserved, set to 0
4689          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4690          * 04      IDLC, idle control, 0=mark 1=idle register
4691          * 03      BRK, break, 0=off 1 =on (async)
4692          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4693          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4694          * 00      RTS, RTS output control, 0=active 1=inactive
4695          *
4696          * 0001 0001
4697          */
4698         RegValue = 0x10;
4699         if (!(info->serial_signals & SerialSignal_RTS))
4700                 RegValue |= 0x01;
4701         write_reg(info, CTL, RegValue);
4702
4703         /* preamble not supported ! */
4704
4705         tx_set_idle(info);
4706         tx_stop(info);
4707         rx_stop(info);
4708
4709         set_rate(info, info->params.clock_speed);
4710
4711         if (info->params.loopback)
4712                 enable_loopback(info,1);
4713 }
4714
4715 /* Set the transmit HDLC idle mode
4716  */
4717 static void tx_set_idle(SLMP_INFO *info)
4718 {
4719         unsigned char RegValue = 0xff;
4720
4721         /* Map API idle mode to SCA register bits */
4722         switch(info->idle_mode) {
4723         case HDLC_TXIDLE_FLAGS:                 RegValue = 0x7e; break;
4724         case HDLC_TXIDLE_ALT_ZEROS_ONES:        RegValue = 0xaa; break;
4725         case HDLC_TXIDLE_ZEROS:                 RegValue = 0x00; break;
4726         case HDLC_TXIDLE_ONES:                  RegValue = 0xff; break;
4727         case HDLC_TXIDLE_ALT_MARK_SPACE:        RegValue = 0xaa; break;
4728         case HDLC_TXIDLE_SPACE:                 RegValue = 0x00; break;
4729         case HDLC_TXIDLE_MARK:                  RegValue = 0xff; break;
4730         }
4731
4732         write_reg(info, IDL, RegValue);
4733 }
4734
4735 /* Query the adapter for the state of the V24 status (input) signals.
4736  */
4737 static void get_signals(SLMP_INFO *info)
4738 {
4739         u16 status = read_reg(info, SR3);
4740         u16 gpstatus = read_status_reg(info);
4741         u16 testbit;
4742
4743         /* clear all serial signals except RTS and DTR */
4744         info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR;
4745
4746         /* set serial signal bits to reflect MISR */
4747
4748         if (!(status & BIT3))
4749                 info->serial_signals |= SerialSignal_CTS;
4750
4751         if ( !(status & BIT2))
4752                 info->serial_signals |= SerialSignal_DCD;
4753
4754         testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4755         if (!(gpstatus & testbit))
4756                 info->serial_signals |= SerialSignal_RI;
4757
4758         testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4759         if (!(gpstatus & testbit))
4760                 info->serial_signals |= SerialSignal_DSR;
4761 }
4762
4763 /* Set the state of RTS and DTR based on contents of
4764  * serial_signals member of device context.
4765  */
4766 static void set_signals(SLMP_INFO *info)
4767 {
4768         unsigned char RegValue;
4769         u16 EnableBit;
4770
4771         RegValue = read_reg(info, CTL);
4772         if (info->serial_signals & SerialSignal_RTS)
4773                 RegValue &= ~BIT0;
4774         else
4775                 RegValue |= BIT0;
4776         write_reg(info, CTL, RegValue);
4777
4778         // Port 0..3 DTR is ctrl reg <1,3,5,7>
4779         EnableBit = BIT1 << (info->port_num*2);
4780         if (info->serial_signals & SerialSignal_DTR)
4781                 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4782         else
4783                 info->port_array[0]->ctrlreg_value |= EnableBit;
4784         write_control_reg(info);
4785 }
4786
4787 /*******************/
4788 /* DMA Buffer Code */
4789 /*******************/
4790
4791 /* Set the count for all receive buffers to SCABUFSIZE
4792  * and set the current buffer to the first buffer. This effectively
4793  * makes all buffers free and discards any data in buffers.
4794  */
4795 static void rx_reset_buffers(SLMP_INFO *info)
4796 {
4797         rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4798 }
4799
4800 /* Free the buffers used by a received frame
4801  *
4802  * info   pointer to device instance data
4803  * first  index of 1st receive buffer of frame
4804  * last   index of last receive buffer of frame
4805  */
4806 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4807 {
4808         bool done = false;
4809
4810         while(!done) {
4811                 /* reset current buffer for reuse */
4812                 info->rx_buf_list[first].status = 0xff;
4813
4814                 if (first == last) {
4815                         done = true;
4816                         /* set new last rx descriptor address */
4817                         write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4818                 }
4819
4820                 first++;
4821                 if (first == info->rx_buf_count)
4822                         first = 0;
4823         }
4824
4825         /* set current buffer to next buffer after last buffer of frame */
4826         info->current_rx_buf = first;
4827 }
4828
4829 /* Return a received frame from the receive DMA buffers.
4830  * Only frames received without errors are returned.
4831  *
4832  * Return Value:        true if frame returned, otherwise false
4833  */
4834 static bool rx_get_frame(SLMP_INFO *info)
4835 {
4836         unsigned int StartIndex, EndIndex;      /* index of 1st and last buffers of Rx frame */
4837         unsigned short status;
4838         unsigned int framesize = 0;
4839         bool ReturnCode = false;
4840         unsigned long flags;
4841         struct tty_struct *tty = info->port.tty;
4842         unsigned char addr_field = 0xff;
4843         SCADESC *desc;
4844         SCADESC_EX *desc_ex;
4845
4846 CheckAgain:
4847         /* assume no frame returned, set zero length */
4848         framesize = 0;
4849         addr_field = 0xff;
4850
4851         /*
4852          * current_rx_buf points to the 1st buffer of the next available
4853          * receive frame. To find the last buffer of the frame look for
4854          * a non-zero status field in the buffer entries. (The status
4855          * field is set by the 16C32 after completing a receive frame.
4856          */
4857         StartIndex = EndIndex = info->current_rx_buf;
4858
4859         for ( ;; ) {
4860                 desc = &info->rx_buf_list[EndIndex];
4861                 desc_ex = &info->rx_buf_list_ex[EndIndex];
4862
4863                 if (desc->status == 0xff)
4864                         goto Cleanup;   /* current desc still in use, no frames available */
4865
4866                 if (framesize == 0 && info->params.addr_filter != 0xff)
4867                         addr_field = desc_ex->virt_addr[0];
4868
4869                 framesize += desc->length;
4870
4871                 /* Status != 0 means last buffer of frame */
4872                 if (desc->status)
4873                         break;
4874
4875                 EndIndex++;
4876                 if (EndIndex == info->rx_buf_count)
4877                         EndIndex = 0;
4878
4879                 if (EndIndex == info->current_rx_buf) {
4880                         /* all buffers have been 'used' but none mark      */
4881                         /* the end of a frame. Reset buffers and receiver. */
4882                         if ( info->rx_enabled ){
4883                                 spin_lock_irqsave(&info->lock,flags);
4884                                 rx_start(info);
4885                                 spin_unlock_irqrestore(&info->lock,flags);
4886                         }
4887                         goto Cleanup;
4888                 }
4889
4890         }
4891
4892         /* check status of receive frame */
4893
4894         /* frame status is byte stored after frame data
4895          *
4896          * 7 EOM (end of msg), 1 = last buffer of frame
4897          * 6 Short Frame, 1 = short frame
4898          * 5 Abort, 1 = frame aborted
4899          * 4 Residue, 1 = last byte is partial
4900          * 3 Overrun, 1 = overrun occurred during frame reception
4901          * 2 CRC,     1 = CRC error detected
4902          *
4903          */
4904         status = desc->status;
4905
4906         /* ignore CRC bit if not using CRC (bit is undefined) */
4907         /* Note:CRC is not save to data buffer */
4908         if (info->params.crc_type == HDLC_CRC_NONE)
4909                 status &= ~BIT2;
4910
4911         if (framesize == 0 ||
4912                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4913                 /* discard 0 byte frames, this seems to occur sometime
4914                  * when remote is idling flags.
4915                  */
4916                 rx_free_frame_buffers(info, StartIndex, EndIndex);
4917                 goto CheckAgain;
4918         }
4919
4920         if (framesize < 2)
4921                 status |= BIT6;
4922
4923         if (status & (BIT6+BIT5+BIT3+BIT2)) {
4924                 /* received frame has errors,
4925                  * update counts and mark frame size as 0
4926                  */
4927                 if (status & BIT6)
4928                         info->icount.rxshort++;
4929                 else if (status & BIT5)
4930                         info->icount.rxabort++;
4931                 else if (status & BIT3)
4932                         info->icount.rxover++;
4933                 else
4934                         info->icount.rxcrc++;
4935
4936                 framesize = 0;
4937 #if SYNCLINK_GENERIC_HDLC
4938                 {
4939                         info->netdev->stats.rx_errors++;
4940                         info->netdev->stats.rx_frame_errors++;
4941                 }
4942 #endif
4943         }
4944
4945         if ( debug_level >= DEBUG_LEVEL_BH )
4946                 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4947                         __FILE__,__LINE__,info->device_name,status,framesize);
4948
4949         if ( debug_level >= DEBUG_LEVEL_DATA )
4950                 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4951                         min_t(unsigned int, framesize, SCABUFSIZE), 0);
4952
4953         if (framesize) {
4954                 if (framesize > info->max_frame_size)
4955                         info->icount.rxlong++;
4956                 else {
4957                         /* copy dma buffer(s) to contiguous intermediate buffer */
4958                         int copy_count = framesize;
4959                         int index = StartIndex;
4960                         unsigned char *ptmp = info->tmp_rx_buf;
4961                         info->tmp_rx_buf_count = framesize;
4962
4963                         info->icount.rxok++;
4964
4965                         while(copy_count) {
4966                                 int partial_count = min(copy_count,SCABUFSIZE);
4967                                 memcpy( ptmp,
4968                                         info->rx_buf_list_ex[index].virt_addr,
4969                                         partial_count );
4970                                 ptmp += partial_count;
4971                                 copy_count -= partial_count;
4972
4973                                 if ( ++index == info->rx_buf_count )
4974                                         index = 0;
4975                         }
4976
4977 #if SYNCLINK_GENERIC_HDLC
4978                         if (info->netcount)
4979                                 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
4980                         else
4981 #endif
4982                                 ldisc_receive_buf(tty,info->tmp_rx_buf,
4983                                                   info->flag_buf, framesize);
4984                 }
4985         }
4986         /* Free the buffers used by this frame. */
4987         rx_free_frame_buffers( info, StartIndex, EndIndex );
4988
4989         ReturnCode = true;
4990
4991 Cleanup:
4992         if ( info->rx_enabled && info->rx_overflow ) {
4993                 /* Receiver is enabled, but needs to restarted due to
4994                  * rx buffer overflow. If buffers are empty, restart receiver.
4995                  */
4996                 if (info->rx_buf_list[EndIndex].status == 0xff) {
4997                         spin_lock_irqsave(&info->lock,flags);
4998                         rx_start(info);
4999                         spin_unlock_irqrestore(&info->lock,flags);
5000                 }
5001         }
5002
5003         return ReturnCode;
5004 }
5005
5006 /* load the transmit DMA buffer with data
5007  */
5008 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5009 {
5010         unsigned short copy_count;
5011         unsigned int i = 0;
5012         SCADESC *desc;
5013         SCADESC_EX *desc_ex;
5014
5015         if ( debug_level >= DEBUG_LEVEL_DATA )
5016                 trace_block(info, buf, min_t(unsigned int, count, SCABUFSIZE), 1);
5017
5018         /* Copy source buffer to one or more DMA buffers, starting with
5019          * the first transmit dma buffer.
5020          */
5021         for(i=0;;)
5022         {
5023                 copy_count = min_t(unsigned int, count, SCABUFSIZE);
5024
5025                 desc = &info->tx_buf_list[i];
5026                 desc_ex = &info->tx_buf_list_ex[i];
5027
5028                 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5029
5030                 desc->length = copy_count;
5031                 desc->status = 0;
5032
5033                 buf += copy_count;
5034                 count -= copy_count;
5035
5036                 if (!count)
5037                         break;
5038
5039                 i++;
5040                 if (i >= info->tx_buf_count)
5041                         i = 0;
5042         }
5043
5044         info->tx_buf_list[i].status = 0x81;     /* set EOM and EOT status */
5045         info->last_tx_buf = ++i;
5046 }
5047
5048 static bool register_test(SLMP_INFO *info)
5049 {
5050         static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5051         static unsigned int count = ARRAY_SIZE(testval);
5052         unsigned int i;
5053         bool rc = true;
5054         unsigned long flags;
5055
5056         spin_lock_irqsave(&info->lock,flags);
5057         reset_port(info);
5058
5059         /* assume failure */
5060         info->init_error = DiagStatus_AddressFailure;
5061
5062         /* Write bit patterns to various registers but do it out of */
5063         /* sync, then read back and verify values. */
5064
5065         for (i = 0 ; i < count ; i++) {
5066                 write_reg(info, TMC, testval[i]);
5067                 write_reg(info, IDL, testval[(i+1)%count]);
5068                 write_reg(info, SA0, testval[(i+2)%count]);
5069                 write_reg(info, SA1, testval[(i+3)%count]);
5070
5071                 if ( (read_reg(info, TMC) != testval[i]) ||
5072                           (read_reg(info, IDL) != testval[(i+1)%count]) ||
5073                           (read_reg(info, SA0) != testval[(i+2)%count]) ||
5074                           (read_reg(info, SA1) != testval[(i+3)%count]) )
5075                 {
5076                         rc = false;
5077                         break;
5078                 }
5079         }
5080
5081         reset_port(info);
5082         spin_unlock_irqrestore(&info->lock,flags);
5083
5084         return rc;
5085 }
5086
5087 static bool irq_test(SLMP_INFO *info)
5088 {
5089         unsigned long timeout;
5090         unsigned long flags;
5091
5092         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5093
5094         spin_lock_irqsave(&info->lock,flags);
5095         reset_port(info);
5096
5097         /* assume failure */
5098         info->init_error = DiagStatus_IrqFailure;
5099         info->irq_occurred = false;
5100
5101         /* setup timer0 on SCA0 to interrupt */
5102
5103         /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5104         write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5105
5106         write_reg(info, (unsigned char)(timer + TEPR), 0);      /* timer expand prescale */
5107         write_reg16(info, (unsigned char)(timer + TCONR), 1);   /* timer constant */
5108
5109
5110         /* TMCS, Timer Control/Status Register
5111          *
5112          * 07      CMF, Compare match flag (read only) 1=match
5113          * 06      ECMI, CMF Interrupt Enable: 1=enabled
5114          * 05      Reserved, must be 0
5115          * 04      TME, Timer Enable
5116          * 03..00  Reserved, must be 0
5117          *
5118          * 0101 0000
5119          */
5120         write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5121
5122         spin_unlock_irqrestore(&info->lock,flags);
5123
5124         timeout=100;
5125         while( timeout-- && !info->irq_occurred ) {
5126                 msleep_interruptible(10);
5127         }
5128
5129         spin_lock_irqsave(&info->lock,flags);
5130         reset_port(info);
5131         spin_unlock_irqrestore(&info->lock,flags);
5132
5133         return info->irq_occurred;
5134 }
5135
5136 /* initialize individual SCA device (2 ports)
5137  */
5138 static bool sca_init(SLMP_INFO *info)
5139 {
5140         /* set wait controller to single mem partition (low), no wait states */
5141         write_reg(info, PABR0, 0);      /* wait controller addr boundary 0 */
5142         write_reg(info, PABR1, 0);      /* wait controller addr boundary 1 */
5143         write_reg(info, WCRL, 0);       /* wait controller low range */
5144         write_reg(info, WCRM, 0);       /* wait controller mid range */
5145         write_reg(info, WCRH, 0);       /* wait controller high range */
5146
5147         /* DPCR, DMA Priority Control
5148          *
5149          * 07..05  Not used, must be 0
5150          * 04      BRC, bus release condition: 0=all transfers complete
5151          * 03      CCC, channel change condition: 0=every cycle
5152          * 02..00  PR<2..0>, priority 100=round robin
5153          *
5154          * 00000100 = 0x04
5155          */
5156         write_reg(info, DPCR, dma_priority);
5157
5158         /* DMA Master Enable, BIT7: 1=enable all channels */
5159         write_reg(info, DMER, 0x80);
5160
5161         /* enable all interrupt classes */
5162         write_reg(info, IER0, 0xff);    /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5163         write_reg(info, IER1, 0xff);    /* DMIB,DMIA (channels 0-3) */
5164         write_reg(info, IER2, 0xf0);    /* TIRQ (timers 0-3) */
5165
5166         /* ITCR, interrupt control register
5167          * 07      IPC, interrupt priority, 0=MSCI->DMA
5168          * 06..05  IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5169          * 04      VOS, Vector Output, 0=unmodified vector
5170          * 03..00  Reserved, must be 0
5171          */
5172         write_reg(info, ITCR, 0);
5173
5174         return true;
5175 }
5176
5177 /* initialize adapter hardware
5178  */
5179 static bool init_adapter(SLMP_INFO *info)
5180 {
5181         int i;
5182
5183         /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5184         volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5185         u32 readval;
5186
5187         info->misc_ctrl_value |= BIT30;
5188         *MiscCtrl = info->misc_ctrl_value;
5189
5190         /*
5191          * Force at least 170ns delay before clearing
5192          * reset bit. Each read from LCR takes at least
5193          * 30ns so 10 times for 300ns to be safe.
5194          */
5195         for(i=0;i<10;i++)
5196                 readval = *MiscCtrl;
5197
5198         info->misc_ctrl_value &= ~BIT30;
5199         *MiscCtrl = info->misc_ctrl_value;
5200
5201         /* init control reg (all DTRs off, all clksel=input) */
5202         info->ctrlreg_value = 0xaa;
5203         write_control_reg(info);
5204
5205         {
5206                 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5207                 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5208
5209                 switch(read_ahead_count)
5210                 {
5211                 case 16:
5212                         lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5213                         break;
5214                 case 8:
5215                         lcr1_brdr_value |= BIT5 + BIT4;
5216                         break;
5217                 case 4:
5218                         lcr1_brdr_value |= BIT5 + BIT3;
5219                         break;
5220                 case 0:
5221                         lcr1_brdr_value |= BIT5;
5222                         break;
5223                 }
5224
5225                 *LCR1BRDR = lcr1_brdr_value;
5226                 *MiscCtrl = misc_ctrl_value;
5227         }
5228
5229         sca_init(info->port_array[0]);
5230         sca_init(info->port_array[2]);
5231
5232         return true;
5233 }
5234
5235 /* Loopback an HDLC frame to test the hardware
5236  * interrupt and DMA functions.
5237  */
5238 static bool loopback_test(SLMP_INFO *info)
5239 {
5240 #define TESTFRAMESIZE 20
5241
5242         unsigned long timeout;
5243         u16 count = TESTFRAMESIZE;
5244         unsigned char buf[TESTFRAMESIZE];
5245         bool rc = false;
5246         unsigned long flags;
5247
5248         struct tty_struct *oldtty = info->port.tty;
5249         u32 speed = info->params.clock_speed;
5250
5251         info->params.clock_speed = 3686400;
5252         info->port.tty = NULL;
5253
5254         /* assume failure */
5255         info->init_error = DiagStatus_DmaFailure;
5256
5257         /* build and send transmit frame */
5258         for (count = 0; count < TESTFRAMESIZE;++count)
5259                 buf[count] = (unsigned char)count;
5260
5261         memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5262
5263         /* program hardware for HDLC and enabled receiver */
5264         spin_lock_irqsave(&info->lock,flags);
5265         hdlc_mode(info);
5266         enable_loopback(info,1);
5267         rx_start(info);
5268         info->tx_count = count;
5269         tx_load_dma_buffer(info,buf,count);
5270         tx_start(info);
5271         spin_unlock_irqrestore(&info->lock,flags);
5272
5273         /* wait for receive complete */
5274         /* Set a timeout for waiting for interrupt. */
5275         for ( timeout = 100; timeout; --timeout ) {
5276                 msleep_interruptible(10);
5277
5278                 if (rx_get_frame(info)) {
5279                         rc = true;
5280                         break;
5281                 }
5282         }
5283
5284         /* verify received frame length and contents */
5285         if (rc &&
5286             ( info->tmp_rx_buf_count != count ||
5287               memcmp(buf, info->tmp_rx_buf,count))) {
5288                 rc = false;
5289         }
5290
5291         spin_lock_irqsave(&info->lock,flags);
5292         reset_adapter(info);
5293         spin_unlock_irqrestore(&info->lock,flags);
5294
5295         info->params.clock_speed = speed;
5296         info->port.tty = oldtty;
5297
5298         return rc;
5299 }
5300
5301 /* Perform diagnostics on hardware
5302  */
5303 static int adapter_test( SLMP_INFO *info )
5304 {
5305         unsigned long flags;
5306         if ( debug_level >= DEBUG_LEVEL_INFO )
5307                 printk( "%s(%d):Testing device %s\n",
5308                         __FILE__,__LINE__,info->device_name );
5309
5310         spin_lock_irqsave(&info->lock,flags);
5311         init_adapter(info);
5312         spin_unlock_irqrestore(&info->lock,flags);
5313
5314         info->port_array[0]->port_count = 0;
5315
5316         if ( register_test(info->port_array[0]) &&
5317                 register_test(info->port_array[1])) {
5318
5319                 info->port_array[0]->port_count = 2;
5320
5321                 if ( register_test(info->port_array[2]) &&
5322                         register_test(info->port_array[3]) )
5323                         info->port_array[0]->port_count += 2;
5324         }
5325         else {
5326                 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5327                         __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5328                 return -ENODEV;
5329         }
5330
5331         if ( !irq_test(info->port_array[0]) ||
5332                 !irq_test(info->port_array[1]) ||
5333                  (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5334                  (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5335                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5336                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5337                 return -ENODEV;
5338         }
5339
5340         if (!loopback_test(info->port_array[0]) ||
5341                 !loopback_test(info->port_array[1]) ||
5342                  (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5343                  (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5344                 printk( "%s(%d):DMA test failure for device %s\n",
5345                         __FILE__,__LINE__,info->device_name);
5346                 return -ENODEV;
5347         }
5348
5349         if ( debug_level >= DEBUG_LEVEL_INFO )
5350                 printk( "%s(%d):device %s passed diagnostics\n",
5351                         __FILE__,__LINE__,info->device_name );
5352
5353         info->port_array[0]->init_error = 0;
5354         info->port_array[1]->init_error = 0;
5355         if ( info->port_count > 2 ) {
5356                 info->port_array[2]->init_error = 0;
5357                 info->port_array[3]->init_error = 0;
5358         }
5359
5360         return 0;
5361 }
5362
5363 /* Test the shared memory on a PCI adapter.
5364  */
5365 static bool memory_test(SLMP_INFO *info)
5366 {
5367         static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5368                 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5369         unsigned long count = ARRAY_SIZE(testval);
5370         unsigned long i;
5371         unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5372         unsigned long * addr = (unsigned long *)info->memory_base;
5373
5374         /* Test data lines with test pattern at one location. */
5375
5376         for ( i = 0 ; i < count ; i++ ) {
5377                 *addr = testval[i];
5378                 if ( *addr != testval[i] )
5379                         return false;
5380         }
5381
5382         /* Test address lines with incrementing pattern over */
5383         /* entire address range. */
5384
5385         for ( i = 0 ; i < limit ; i++ ) {
5386                 *addr = i * 4;
5387                 addr++;
5388         }
5389
5390         addr = (unsigned long *)info->memory_base;
5391
5392         for ( i = 0 ; i < limit ; i++ ) {
5393                 if ( *addr != i * 4 )
5394                         return false;
5395                 addr++;
5396         }
5397
5398         memset( info->memory_base, 0, SCA_MEM_SIZE );
5399         return true;
5400 }
5401
5402 /* Load data into PCI adapter shared memory.
5403  *
5404  * The PCI9050 releases control of the local bus
5405  * after completing the current read or write operation.
5406  *
5407  * While the PCI9050 write FIFO not empty, the
5408  * PCI9050 treats all of the writes as a single transaction
5409  * and does not release the bus. This causes DMA latency problems
5410  * at high speeds when copying large data blocks to the shared memory.
5411  *
5412  * This function breaks a write into multiple transations by
5413  * interleaving a read which flushes the write FIFO and 'completes'
5414  * the write transation. This allows any pending DMA request to gain control
5415  * of the local bus in a timely fasion.
5416  */
5417 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5418 {
5419         /* A load interval of 16 allows for 4 32-bit writes at */
5420         /* 136ns each for a maximum latency of 542ns on the local bus.*/
5421
5422         unsigned short interval = count / sca_pci_load_interval;
5423         unsigned short i;
5424
5425         for ( i = 0 ; i < interval ; i++ )
5426         {
5427                 memcpy(dest, src, sca_pci_load_interval);
5428                 read_status_reg(info);
5429                 dest += sca_pci_load_interval;
5430                 src += sca_pci_load_interval;
5431         }
5432
5433         memcpy(dest, src, count % sca_pci_load_interval);
5434 }
5435
5436 static void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5437 {
5438         int i;
5439         int linecount;
5440         if (xmit)
5441                 printk("%s tx data:\n",info->device_name);
5442         else
5443                 printk("%s rx data:\n",info->device_name);
5444
5445         while(count) {
5446                 if (count > 16)
5447                         linecount = 16;
5448                 else
5449                         linecount = count;
5450
5451                 for(i=0;i<linecount;i++)
5452                         printk("%02X ",(unsigned char)data[i]);
5453                 for(;i<17;i++)
5454                         printk("   ");
5455                 for(i=0;i<linecount;i++) {
5456                         if (data[i]>=040 && data[i]<=0176)
5457                                 printk("%c",data[i]);
5458                         else
5459                                 printk(".");
5460                 }
5461                 printk("\n");
5462
5463                 data  += linecount;
5464                 count -= linecount;
5465         }
5466 }       /* end of trace_block() */
5467
5468 /* called when HDLC frame times out
5469  * update stats and do tx completion processing
5470  */
5471 static void tx_timeout(unsigned long context)
5472 {
5473         SLMP_INFO *info = (SLMP_INFO*)context;
5474         unsigned long flags;
5475
5476         if ( debug_level >= DEBUG_LEVEL_INFO )
5477                 printk( "%s(%d):%s tx_timeout()\n",
5478                         __FILE__,__LINE__,info->device_name);
5479         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5480                 info->icount.txtimeout++;
5481         }
5482         spin_lock_irqsave(&info->lock,flags);
5483         info->tx_active = false;
5484         info->tx_count = info->tx_put = info->tx_get = 0;
5485
5486         spin_unlock_irqrestore(&info->lock,flags);
5487
5488 #if SYNCLINK_GENERIC_HDLC
5489         if (info->netcount)
5490                 hdlcdev_tx_done(info);
5491         else
5492 #endif
5493                 bh_transmit(info);
5494 }
5495
5496 /* called to periodically check the DSR/RI modem signal input status
5497  */
5498 static void status_timeout(unsigned long context)
5499 {
5500         u16 status = 0;
5501         SLMP_INFO *info = (SLMP_INFO*)context;
5502         unsigned long flags;
5503         unsigned char delta;
5504
5505
5506         spin_lock_irqsave(&info->lock,flags);
5507         get_signals(info);
5508         spin_unlock_irqrestore(&info->lock,flags);
5509
5510         /* check for DSR/RI state change */
5511
5512         delta = info->old_signals ^ info->serial_signals;
5513         info->old_signals = info->serial_signals;
5514
5515         if (delta & SerialSignal_DSR)
5516                 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5517
5518         if (delta & SerialSignal_RI)
5519                 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5520
5521         if (delta & SerialSignal_DCD)
5522                 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5523
5524         if (delta & SerialSignal_CTS)
5525                 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5526
5527         if (status)
5528                 isr_io_pin(info,status);
5529
5530         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
5531 }
5532
5533
5534 /* Register Access Routines -
5535  * All registers are memory mapped
5536  */
5537 #define CALC_REGADDR() \
5538         unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5539         if (info->port_num > 1) \
5540                 RegAddr += 256;                 /* port 0-1 SCA0, 2-3 SCA1 */ \
5541         if ( info->port_num & 1) { \
5542                 if (Addr > 0x7f) \
5543                         RegAddr += 0x40;        /* DMA access */ \
5544                 else if (Addr > 0x1f && Addr < 0x60) \
5545                         RegAddr += 0x20;        /* MSCI access */ \
5546         }
5547
5548
5549 static unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5550 {
5551         CALC_REGADDR();
5552         return *RegAddr;
5553 }
5554 static void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5555 {
5556         CALC_REGADDR();
5557         *RegAddr = Value;
5558 }
5559
5560 static u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5561 {
5562         CALC_REGADDR();
5563         return *((u16 *)RegAddr);
5564 }
5565
5566 static void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5567 {
5568         CALC_REGADDR();
5569         *((u16 *)RegAddr) = Value;
5570 }
5571
5572 static unsigned char read_status_reg(SLMP_INFO * info)
5573 {
5574         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5575         return *RegAddr;
5576 }
5577
5578 static void write_control_reg(SLMP_INFO * info)
5579 {
5580         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5581         *RegAddr = info->port_array[0]->ctrlreg_value;
5582 }
5583
5584
5585 static int synclinkmp_init_one (struct pci_dev *dev,
5586                                           const struct pci_device_id *ent)
5587 {
5588         if (pci_enable_device(dev)) {
5589                 printk("error enabling pci device %p\n", dev);
5590                 return -EIO;
5591         }
5592         device_init( ++synclinkmp_adapter_count, dev );
5593         return 0;
5594 }
5595
5596 static void synclinkmp_remove_one (struct pci_dev *dev)
5597 {
5598 }