kernel/drivers/char/pcmcia/synclink_cs.c

   1 /*
   2  * linux/drivers/char/pcmcia/synclink_cs.c
   3  *
   4  * $Id: synclink_cs.c,v 4.34 2005/09/08 13:20:54 paulkf Exp $
   5  *
   6  * Device driver for Microgate SyncLink PC Card
   7  * multiprotocol serial adapter.
   8  *
   9  * written by Paul Fulghum for Microgate Corporation
  10  * paulkf@microgate.com
  11  *
  12  * Microgate and SyncLink are trademarks of Microgate Corporation
  13  *
  14  * This code is released under the GNU General Public License (GPL)
  15  *
  16  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  19  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  20  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  22  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  24  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  26  * OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
  30 #if defined(__i386__)
  31 #  define BREAKPOINT() asm("   int $3");
  32 #else
  33 #  define BREAKPOINT() { }
  34 #endif
  35
  36 #define MAX_DEVICE_COUNT 4
  37
  38 #include <linux/module.h>
  39 #include <linux/errno.h>
  40 #include <linux/signal.h>
  41 #include <linux/sched.h>
  42 #include <linux/timer.h>
  43 #include <linux/time.h>
  44 #include <linux/interrupt.h>
  45 #include <linux/tty.h>
  46 #include <linux/tty_flip.h>
  47 #include <linux/serial.h>
  48 #include <linux/major.h>
  49 #include <linux/string.h>
  50 #include <linux/fcntl.h>
  51 #include <linux/ptrace.h>
  52 #include <linux/ioport.h>
  53 #include <linux/mm.h>
  54 #include <linux/seq_file.h>
  55 #include <linux/slab.h>
  56 #include <linux/netdevice.h>
  57 #include <linux/vmalloc.h>
  58 #include <linux/init.h>
  59 #include <linux/delay.h>
  60 #include <linux/ioctl.h>
  61 #include <linux/synclink.h>
  62
  63 #include <asm/io.h>
  64 #include <asm/irq.h>
  65 #include <asm/dma.h>
  66 #include <linux/bitops.h>
  67 #include <asm/types.h>
  68 #include <linux/termios.h>
  69 #include <linux/workqueue.h>
  70 #include <linux/hdlc.h>
  71
  72 #include <pcmcia/cistpl.h>
  73 #include <pcmcia/cisreg.h>
  74 #include <pcmcia/ds.h>
  75
  76 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_CS_MODULE))
  77 #define SYNCLINK_GENERIC_HDLC 1
  78 #else
  79 #define SYNCLINK_GENERIC_HDLC 0
  80 #endif
  81
  82 #define GET_USER(error,value,addr) error = get_user(value,addr)
  83 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
  84 #define PUT_USER(error,value,addr) error = put_user(value,addr)
  85 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
  86
  87 #include <asm/uaccess.h>
  88
  89 static MGSL_PARAMS default_params = {
  90         MGSL_MODE_HDLC,                 /* unsigned long mode */
  91         0,                              /* unsigned char loopback; */
  92         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
  93         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
  94         0,                              /* unsigned long clock_speed; */
  95         0xff,                           /* unsigned char addr_filter; */
  96         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
  97         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
  98         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
  99         9600,                           /* unsigned long data_rate; */
 100         8,                              /* unsigned char data_bits; */
 101         1,                              /* unsigned char stop_bits; */
 102         ASYNC_PARITY_NONE               /* unsigned char parity; */
 103 };
 104
 105 typedef struct {
 106         int count;
 107         unsigned char status;
 108         char data[1];
 109 } RXBUF;
 110
 111 /* The queue of BH actions to be performed */
 112
 113 #define BH_RECEIVE  1
 114 #define BH_TRANSMIT 2
 115 #define BH_STATUS   4
 116
 117 #define IO_PIN_SHUTDOWN_LIMIT 100
 118
 119 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 120
 121 struct _input_signal_events {
 122         int     ri_up;
 123         int     ri_down;
 124         int     dsr_up;
 125         int     dsr_down;
 126         int     dcd_up;
 127         int     dcd_down;
 128         int     cts_up;
 129         int     cts_down;
 130 };
 131
 132
 133 /*
 134  * Device instance data structure
 135  */
 136
 137 typedef struct _mgslpc_info {
 138         struct tty_port         port;
 139         void *if_ptr;   /* General purpose pointer (used by SPPP) */
 140         int                     magic;
 141         int                     line;
 142
 143         struct mgsl_icount      icount;
 144
 145         int                     timeout;
 146         int                     x_char;         /* xon/xoff character */
 147         unsigned char           read_status_mask;
 148         unsigned char           ignore_status_mask;
 149
 150         unsigned char *tx_buf;
 151         int            tx_put;
 152         int            tx_get;
 153         int            tx_count;
 154
 155         /* circular list of fixed length rx buffers */
 156
 157         unsigned char  *rx_buf;        /* memory allocated for all rx buffers */
 158         int            rx_buf_total_size; /* size of memory allocated for rx buffers */
 159         int            rx_put;         /* index of next empty rx buffer */
 160         int            rx_get;         /* index of next full rx buffer */
 161         int            rx_buf_size;    /* size in bytes of single rx buffer */
 162         int            rx_buf_count;   /* total number of rx buffers */
 163         int            rx_frame_count; /* number of full rx buffers */
 164
 165         wait_queue_head_t       status_event_wait_q;
 166         wait_queue_head_t       event_wait_q;
 167         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
 168         struct _mgslpc_info     *next_device;   /* device list link */
 169
 170         unsigned short imra_value;
 171         unsigned short imrb_value;
 172         unsigned char  pim_value;
 173
 174         spinlock_t lock;
 175         struct work_struct task;                /* task structure for scheduling bh */
 176
 177         u32 max_frame_size;
 178
 179         u32 pending_bh;
 180
 181         bool bh_running;
 182         bool bh_requested;
 183
 184         int dcd_chkcount; /* check counts to prevent */
 185         int cts_chkcount; /* too many IRQs if a signal */
 186         int dsr_chkcount; /* is floating */
 187         int ri_chkcount;
 188
 189         bool rx_enabled;
 190         bool rx_overflow;
 191
 192         bool tx_enabled;
 193         bool tx_active;
 194         bool tx_aborting;
 195         u32 idle_mode;
 196
 197         int if_mode; /* serial interface selection (RS-232, v.35 etc) */
 198
 199         char device_name[25];           /* device instance name */
 200
 201         unsigned int io_base;   /* base I/O address of adapter */
 202         unsigned int irq_level;
 203
 204         MGSL_PARAMS params;             /* communications parameters */
 205
 206         unsigned char serial_signals;   /* current serial signal states */
 207
 208         bool irq_occurred;              /* for diagnostics use */
 209         char testing_irq;
 210         unsigned int init_error;        /* startup error (DIAGS)        */
 211
 212         char *flag_buf;
 213         bool drop_rts_on_tx_done;
 214
 215         struct  _input_signal_events    input_signal_events;
 216
 217         /* PCMCIA support */
 218         struct pcmcia_device    *p_dev;
 219         int                   stop;
 220
 221         /* SPPP/Cisco HDLC device parts */
 222         int netcount;
 223         spinlock_t netlock;
 224
 225 #if SYNCLINK_GENERIC_HDLC
 226         struct net_device *netdev;
 227 #endif
 228
 229 } MGSLPC_INFO;
 230
 231 #define MGSLPC_MAGIC 0x5402
 232
 233 /*
 234  * The size of the serial xmit buffer is 1 page, or 4096 bytes
 235  */
 236 #define TXBUFSIZE 4096
 237
 238
 239 #define CHA     0x00   /* channel A offset */
 240 #define CHB     0x40   /* channel B offset */
 241
 242 /*
 243  *  FIXME: PPC has PVR defined in asm/reg.h.  For now we just undef it.
 244  */
 245 #undef PVR
 246
 247 #define RXFIFO  0
 248 #define TXFIFO  0
 249 #define STAR    0x20
 250 #define CMDR    0x20
 251 #define RSTA    0x21
 252 #define PRE     0x21
 253 #define MODE    0x22
 254 #define TIMR    0x23
 255 #define XAD1    0x24
 256 #define XAD2    0x25
 257 #define RAH1    0x26
 258 #define RAH2    0x27
 259 #define DAFO    0x27
 260 #define RAL1    0x28
 261 #define RFC     0x28
 262 #define RHCR    0x29
 263 #define RAL2    0x29
 264 #define RBCL    0x2a
 265 #define XBCL    0x2a
 266 #define RBCH    0x2b
 267 #define XBCH    0x2b
 268 #define CCR0    0x2c
 269 #define CCR1    0x2d
 270 #define CCR2    0x2e
 271 #define CCR3    0x2f
 272 #define VSTR    0x34
 273 #define BGR     0x34
 274 #define RLCR    0x35
 275 #define AML     0x36
 276 #define AMH     0x37
 277 #define GIS     0x38
 278 #define IVA     0x38
 279 #define IPC     0x39
 280 #define ISR     0x3a
 281 #define IMR     0x3a
 282 #define PVR     0x3c
 283 #define PIS     0x3d
 284 #define PIM     0x3d
 285 #define PCR     0x3e
 286 #define CCR4    0x3f
 287
 288 // IMR/ISR
 289
 290 #define IRQ_BREAK_ON    BIT15   // rx break detected
 291 #define IRQ_DATAOVERRUN BIT14   // receive data overflow
 292 #define IRQ_ALLSENT     BIT13   // all sent
 293 #define IRQ_UNDERRUN    BIT12   // transmit data underrun
 294 #define IRQ_TIMER       BIT11   // timer interrupt
 295 #define IRQ_CTS         BIT10   // CTS status change
 296 #define IRQ_TXREPEAT    BIT9    // tx message repeat
 297 #define IRQ_TXFIFO      BIT8    // transmit pool ready
 298 #define IRQ_RXEOM       BIT7    // receive message end
 299 #define IRQ_EXITHUNT    BIT6    // receive frame start
 300 #define IRQ_RXTIME      BIT6    // rx char timeout
 301 #define IRQ_DCD         BIT2    // carrier detect status change
 302 #define IRQ_OVERRUN     BIT1    // receive frame overflow
 303 #define IRQ_RXFIFO      BIT0    // receive pool full
 304
 305 // STAR
 306
 307 #define XFW   BIT6              // transmit FIFO write enable
 308 #define CEC   BIT2              // command executing
 309 #define CTS   BIT1              // CTS state
 310
 311 #define PVR_DTR      BIT0
 312 #define PVR_DSR      BIT1
 313 #define PVR_RI       BIT2
 314 #define PVR_AUTOCTS  BIT3
 315 #define PVR_RS232    0x20   /* 0010b */
 316 #define PVR_V35      0xe0   /* 1110b */
 317 #define PVR_RS422    0x40   /* 0100b */
 318
 319 /* Register access functions */
 320
 321 #define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
 322 #define read_reg(info, reg) inb((info)->io_base + (reg))
 323
 324 #define read_reg16(info, reg) inw((info)->io_base + (reg))
 325 #define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
 326
 327 #define set_reg_bits(info, reg, mask) \
 328         write_reg(info, (reg), \
 329                  (unsigned char) (read_reg(info, (reg)) | (mask)))
 330 #define clear_reg_bits(info, reg, mask) \
 331         write_reg(info, (reg), \
 332                  (unsigned char) (read_reg(info, (reg)) & ~(mask)))
 333 /*
 334  * interrupt enable/disable routines
 335  */
 336 static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
 337 {
 338         if (channel == CHA) {
 339                 info->imra_value |= mask;
 340                 write_reg16(info, CHA + IMR, info->imra_value);
 341         } else {
 342                 info->imrb_value |= mask;
 343                 write_reg16(info, CHB + IMR, info->imrb_value);
 344         }
 345 }
 346 static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
 347 {
 348         if (channel == CHA) {
 349                 info->imra_value &= ~mask;
 350                 write_reg16(info, CHA + IMR, info->imra_value);
 351         } else {
 352                 info->imrb_value &= ~mask;
 353                 write_reg16(info, CHB + IMR, info->imrb_value);
 354         }
 355 }
 356
 357 #define port_irq_disable(info, mask) \
 358         { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
 359
 360 #define port_irq_enable(info, mask) \
 361         { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
 362
 363 static void rx_start(MGSLPC_INFO *info);
 364 static void rx_stop(MGSLPC_INFO *info);
 365
 366 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty);
 367 static void tx_stop(MGSLPC_INFO *info);
 368 static void tx_set_idle(MGSLPC_INFO *info);
 369
 370 static void get_signals(MGSLPC_INFO *info);
 371 static void set_signals(MGSLPC_INFO *info);
 372
 373 static void reset_device(MGSLPC_INFO *info);
 374
 375 static void hdlc_mode(MGSLPC_INFO *info);
 376 static void async_mode(MGSLPC_INFO *info);
 377
 378 static void tx_timeout(unsigned long context);
 379
 380 static int carrier_raised(struct tty_port *port);
 381 static void dtr_rts(struct tty_port *port, int onoff);
 382
 383 #if SYNCLINK_GENERIC_HDLC
 384 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 385 static void hdlcdev_tx_done(MGSLPC_INFO *info);
 386 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size);
 387 static int  hdlcdev_init(MGSLPC_INFO *info);
 388 static void hdlcdev_exit(MGSLPC_INFO *info);
 389 #endif
 390
 391 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
 392
 393 static bool register_test(MGSLPC_INFO *info);
 394 static bool irq_test(MGSLPC_INFO *info);
 395 static int adapter_test(MGSLPC_INFO *info);
 396
 397 static int claim_resources(MGSLPC_INFO *info);
 398 static void release_resources(MGSLPC_INFO *info);
 399 static int mgslpc_add_device(MGSLPC_INFO *info);
 400 static void mgslpc_remove_device(MGSLPC_INFO *info);
 401
 402 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty);
 403 static void rx_reset_buffers(MGSLPC_INFO *info);
 404 static int  rx_alloc_buffers(MGSLPC_INFO *info);
 405 static void rx_free_buffers(MGSLPC_INFO *info);
 406
 407 static irqreturn_t mgslpc_isr(int irq, void *dev_id);
 408
 409 /*
 410  * Bottom half interrupt handlers
 411  */
 412 static void bh_handler(struct work_struct *work);
 413 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty);
 414 static void bh_status(MGSLPC_INFO *info);
 415
 416 /*
 417  * ioctl handlers
 418  */
 419 static int tiocmget(struct tty_struct *tty);
 420 static int tiocmset(struct tty_struct *tty,
 421                                         unsigned int set, unsigned int clear);
 422 static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount);
 423 static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params);
 424 static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params, struct tty_struct *tty);
 425 static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode);
 426 static int set_txidle(MGSLPC_INFO *info, int idle_mode);
 427 static int set_txenable(MGSLPC_INFO *info, int enable, struct tty_struct *tty);
 428 static int tx_abort(MGSLPC_INFO *info);
 429 static int set_rxenable(MGSLPC_INFO *info, int enable);
 430 static int wait_events(MGSLPC_INFO *info, int __user *mask);
 431
 432 static MGSLPC_INFO *mgslpc_device_list = NULL;
 433 static int mgslpc_device_count = 0;
 434
 435 /*
 436  * Set this param to non-zero to load eax with the
 437  * .text section address and breakpoint on module load.
 438  * This is useful for use with gdb and add-symbol-file command.
 439  */
 440 static bool break_on_load=0;
 441
 442 /*
 443  * Driver major number, defaults to zero to get auto
 444  * assigned major number. May be forced as module parameter.
 445  */
 446 static int ttymajor=0;
 447
 448 static int debug_level = 0;
 449 static int maxframe[MAX_DEVICE_COUNT] = {0,};
 450
 451 module_param(break_on_load, bool, 0);
 452 module_param(ttymajor, int, 0);
 453 module_param(debug_level, int, 0);
 454 module_param_array(maxframe, int, NULL, 0);
 455
 456 MODULE_LICENSE("GPL");
 457
 458 static char *driver_name = "SyncLink PC Card driver";
 459 static char *driver_version = "$Revision: 4.34 $";
 460
 461 static struct tty_driver *serial_driver;
 462
 463 /* number of characters left in xmit buffer before we ask for more */
 464 #define WAKEUP_CHARS 256
 465
 466 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty);
 467 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
 468
 469 /* PCMCIA prototypes */
 470
 471 static int mgslpc_config(struct pcmcia_device *link);
 472 static void mgslpc_release(u_long arg);
 473 static void mgslpc_detach(struct pcmcia_device *p_dev);
 474
 475 /*
 476  * 1st function defined in .text section. Calling this function in
 477  * init_module() followed by a breakpoint allows a remote debugger
 478  * (gdb) to get the .text address for the add-symbol-file command.
 479  * This allows remote debugging of dynamically loadable modules.
 480  */
 481 static void* mgslpc_get_text_ptr(void)
 482 {
 483         return mgslpc_get_text_ptr;
 484 }
 485
 486 /**
 487  * line discipline callback wrappers
 488  *
 489  * The wrappers maintain line discipline references
 490  * while calling into the line discipline.
 491  *
 492  * ldisc_receive_buf  - pass receive data to line discipline
 493  */
 494
 495 static void ldisc_receive_buf(struct tty_struct *tty,
 496                               const __u8 *data, char *flags, int count)
 497 {
 498         struct tty_ldisc *ld;
 499         if (!tty)
 500                 return;
 501         ld = tty_ldisc_ref(tty);
 502         if (ld) {
 503                 if (ld->ops->receive_buf)
 504                         ld->ops->receive_buf(tty, data, flags, count);
 505                 tty_ldisc_deref(ld);
 506         }
 507 }
 508
 509 static const struct tty_port_operations mgslpc_port_ops = {
 510         .carrier_raised = carrier_raised,
 511         .dtr_rts = dtr_rts
 512 };
 513
 514 static int mgslpc_probe(struct pcmcia_device *link)
 515 {
 516         MGSLPC_INFO *info;
 517         int ret;
 518
 519         if (debug_level >= DEBUG_LEVEL_INFO)
 520                 printk("mgslpc_attach\n");
 521
 522         info = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
 523         if (!info) {
 524                 printk("Error can't allocate device instance data\n");
 525                 return -ENOMEM;
 526         }
 527
 528         info->magic = MGSLPC_MAGIC;
 529         tty_port_init(&info->port);
 530         info->port.ops = &mgslpc_port_ops;
 531         INIT_WORK(&info->task, bh_handler);
 532         info->max_frame_size = 4096;
 533         info->port.close_delay = 5*HZ/10;
 534         info->port.closing_wait = 30*HZ;
 535         init_waitqueue_head(&info->status_event_wait_q);
 536         init_waitqueue_head(&info->event_wait_q);
 537         spin_lock_init(&info->lock);
 538         spin_lock_init(&info->netlock);
 539         memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
 540         info->idle_mode = HDLC_TXIDLE_FLAGS;
 541         info->imra_value = 0xffff;
 542         info->imrb_value = 0xffff;
 543         info->pim_value = 0xff;
 544
 545         info->p_dev = link;
 546         link->priv = info;
 547
 548         /* Initialize the struct pcmcia_device structure */
 549
 550         ret = mgslpc_config(link);
 551         if (ret != 0)
 552                 goto failed;
 553
 554         ret = mgslpc_add_device(info);
 555         if (ret != 0)
 556                 goto failed_release;
 557
 558         return 0;
 559
 560 failed_release:
 561         mgslpc_release((u_long)link);
 562 failed:
 563         tty_port_destroy(&info->port);
 564         kfree(info);
 565         return ret;
 566 }
 567
 568 /* Card has been inserted.
 569  */
 570
 571 static int mgslpc_ioprobe(struct pcmcia_device *p_dev, void *priv_data)
 572 {
 573         return pcmcia_request_io(p_dev);
 574 }
 575
 576 static int mgslpc_config(struct pcmcia_device *link)
 577 {
 578         MGSLPC_INFO *info = link->priv;
 579         int ret;
 580
 581         if (debug_level >= DEBUG_LEVEL_INFO)
 582                 printk("mgslpc_config(0x%p)\n", link);
 583
 584         link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
 585
 586         ret = pcmcia_loop_config(link, mgslpc_ioprobe, NULL);
 587         if (ret != 0)
 588                 goto failed;
 589
 590         link->config_index = 8;
 591         link->config_regs = PRESENT_OPTION;
 592
 593         ret = pcmcia_request_irq(link, mgslpc_isr);
 594         if (ret)
 595                 goto failed;
 596         ret = pcmcia_enable_device(link);
 597         if (ret)
 598                 goto failed;
 599
 600         info->io_base = link->resource[0]->start;
 601         info->irq_level = link->irq;
 602         return 0;
 603
 604 failed:
 605         mgslpc_release((u_long)link);
 606         return -ENODEV;
 607 }
 608
 609 /* Card has been removed.
 610  * Unregister device and release PCMCIA configuration.
 611  * If device is open, postpone until it is closed.
 612  */
 613 static void mgslpc_release(u_long arg)
 614 {
 615         struct pcmcia_device *link = (struct pcmcia_device *)arg;
 616
 617         if (debug_level >= DEBUG_LEVEL_INFO)
 618                 printk("mgslpc_release(0x%p)\n", link);
 619
 620         pcmcia_disable_device(link);
 621 }
 622
 623 static void mgslpc_detach(struct pcmcia_device *link)
 624 {
 625         if (debug_level >= DEBUG_LEVEL_INFO)
 626                 printk("mgslpc_detach(0x%p)\n", link);
 627
 628         ((MGSLPC_INFO *)link->priv)->stop = 1;
 629         mgslpc_release((u_long)link);
 630
 631         mgslpc_remove_device((MGSLPC_INFO *)link->priv);
 632 }
 633
 634 static int mgslpc_suspend(struct pcmcia_device *link)
 635 {
 636         MGSLPC_INFO *info = link->priv;
 637
 638         info->stop = 1;
 639
 640         return 0;
 641 }
 642
 643 static int mgslpc_resume(struct pcmcia_device *link)
 644 {
 645         MGSLPC_INFO *info = link->priv;
 646
 647         info->stop = 0;
 648
 649         return 0;
 650 }
 651
 652
 653 static inline bool mgslpc_paranoia_check(MGSLPC_INFO *info,
 654                                         char *name, const char *routine)
 655 {
 656 #ifdef MGSLPC_PARANOIA_CHECK
 657         static const char *badmagic =
 658                 "Warning: bad magic number for mgsl struct (%s) in %s\n";
 659         static const char *badinfo =
 660                 "Warning: null mgslpc_info for (%s) in %s\n";
 661
 662         if (!info) {
 663                 printk(badinfo, name, routine);
 664                 return true;
 665         }
 666         if (info->magic != MGSLPC_MAGIC) {
 667                 printk(badmagic, name, routine);
 668                 return true;
 669         }
 670 #else
 671         if (!info)
 672                 return true;
 673 #endif
 674         return false;
 675 }
 676
 677
 678 #define CMD_RXFIFO      BIT7    // release current rx FIFO
 679 #define CMD_RXRESET     BIT6    // receiver reset
 680 #define CMD_RXFIFO_READ BIT5
 681 #define CMD_START_TIMER BIT4
 682 #define CMD_TXFIFO      BIT3    // release current tx FIFO
 683 #define CMD_TXEOM       BIT1    // transmit end message
 684 #define CMD_TXRESET     BIT0    // transmit reset
 685
 686 static bool wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
 687 {
 688         int i = 0;
 689         /* wait for command completion */
 690         while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
 691                 udelay(1);
 692                 if (i++ == 1000)
 693                         return false;
 694         }
 695         return true;
 696 }
 697
 698 static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
 699 {
 700         wait_command_complete(info, channel);
 701         write_reg(info, (unsigned char) (channel + CMDR), cmd);
 702 }
 703
 704 static void tx_pause(struct tty_struct *tty)
 705 {
 706         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
 707         unsigned long flags;
 708
 709         if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
 710                 return;
 711         if (debug_level >= DEBUG_LEVEL_INFO)
 712                 printk("tx_pause(%s)\n", info->device_name);
 713
 714         spin_lock_irqsave(&info->lock, flags);
 715         if (info->tx_enabled)
 716                 tx_stop(info);
 717         spin_unlock_irqrestore(&info->lock, flags);
 718 }
 719
 720 static void tx_release(struct tty_struct *tty)
 721 {
 722         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
 723         unsigned long flags;
 724
 725         if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
 726                 return;
 727         if (debug_level >= DEBUG_LEVEL_INFO)
 728                 printk("tx_release(%s)\n", info->device_name);
 729
 730         spin_lock_irqsave(&info->lock, flags);
 731         if (!info->tx_enabled)
 732                 tx_start(info, tty);
 733         spin_unlock_irqrestore(&info->lock, flags);
 734 }
 735
 736 /* Return next bottom half action to perform.
 737  * or 0 if nothing to do.
 738  */
 739 static int bh_action(MGSLPC_INFO *info)
 740 {
 741         unsigned long flags;
 742         int rc = 0;
 743
 744         spin_lock_irqsave(&info->lock, flags);
 745
 746         if (info->pending_bh & BH_RECEIVE) {
 747                 info->pending_bh &= ~BH_RECEIVE;
 748                 rc = BH_RECEIVE;
 749         } else if (info->pending_bh & BH_TRANSMIT) {
 750                 info->pending_bh &= ~BH_TRANSMIT;
 751                 rc = BH_TRANSMIT;
 752         } else if (info->pending_bh & BH_STATUS) {
 753                 info->pending_bh &= ~BH_STATUS;
 754                 rc = BH_STATUS;
 755         }
 756
 757         if (!rc) {
 758                 /* Mark BH routine as complete */
 759                 info->bh_running = false;
 760                 info->bh_requested = false;
 761         }
 762
 763         spin_unlock_irqrestore(&info->lock, flags);
 764
 765         return rc;
 766 }
 767
 768 static void bh_handler(struct work_struct *work)
 769 {
 770         MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task);
 771         struct tty_struct *tty;
 772         int action;
 773
 774         if (debug_level >= DEBUG_LEVEL_BH)
 775                 printk("%s(%d):bh_handler(%s) entry\n",
 776                         __FILE__,__LINE__,info->device_name);
 777
 778         info->bh_running = true;
 779         tty = tty_port_tty_get(&info->port);
 780
 781         while((action = bh_action(info)) != 0) {
 782
 783                 /* Process work item */
 784                 if (debug_level >= DEBUG_LEVEL_BH)
 785                         printk("%s(%d):bh_handler() work item action=%d\n",
 786                                 __FILE__,__LINE__,action);
 787
 788                 switch (action) {
 789
 790                 case BH_RECEIVE:
 791                         while(rx_get_frame(info, tty));
 792                         break;
 793                 case BH_TRANSMIT:
 794                         bh_transmit(info, tty);
 795                         break;
 796                 case BH_STATUS:
 797                         bh_status(info);
 798                         break;
 799                 default:
 800                         /* unknown work item ID */
 801                         printk("Unknown work item ID=%08X!\n", action);
 802                         break;
 803                 }
 804         }
 805
 806         tty_kref_put(tty);
 807         if (debug_level >= DEBUG_LEVEL_BH)
 808                 printk("%s(%d):bh_handler(%s) exit\n",
 809                         __FILE__,__LINE__,info->device_name);
 810 }
 811
 812 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty)
 813 {
 814         if (debug_level >= DEBUG_LEVEL_BH)
 815                 printk("bh_transmit() entry on %s\n", info->device_name);
 816
 817         if (tty)
 818                 tty_wakeup(tty);
 819 }
 820
 821 static void bh_status(MGSLPC_INFO *info)
 822 {
 823         info->ri_chkcount = 0;
 824         info->dsr_chkcount = 0;
 825         info->dcd_chkcount = 0;
 826         info->cts_chkcount = 0;
 827 }
 828
 829 /* eom: non-zero = end of frame */
 830 static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
 831 {
 832         unsigned char data[2];
 833         unsigned char fifo_count, read_count, i;
 834         RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
 835
 836         if (debug_level >= DEBUG_LEVEL_ISR)
 837                 printk("%s(%d):rx_ready_hdlc(eom=%d)\n", __FILE__, __LINE__, eom);
 838
 839         if (!info->rx_enabled)
 840                 return;
 841
 842         if (info->rx_frame_count >= info->rx_buf_count) {
 843                 /* no more free buffers */
 844                 issue_command(info, CHA, CMD_RXRESET);
 845                 info->pending_bh |= BH_RECEIVE;
 846                 info->rx_overflow = true;
 847                 info->icount.buf_overrun++;
 848                 return;
 849         }
 850
 851         if (eom) {
 852                 /* end of frame, get FIFO count from RBCL register */
 853                 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
 854                 if (fifo_count == 0)
 855                         fifo_count = 32;
 856         } else
 857                 fifo_count = 32;
 858
 859         do {
 860                 if (fifo_count == 1) {
 861                         read_count = 1;
 862                         data[0] = read_reg(info, CHA + RXFIFO);
 863                 } else {
 864                         read_count = 2;
 865                         *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
 866                 }
 867                 fifo_count -= read_count;
 868                 if (!fifo_count && eom)
 869                         buf->status = data[--read_count];
 870
 871                 for (i = 0; i < read_count; i++) {
 872                         if (buf->count >= info->max_frame_size) {
 873                                 /* frame too large, reset receiver and reset current buffer */
 874                                 issue_command(info, CHA, CMD_RXRESET);
 875                                 buf->count = 0;
 876                                 return;
 877                         }
 878                         *(buf->data + buf->count) = data[i];
 879                         buf->count++;
 880                 }
 881         } while (fifo_count);
 882
 883         if (eom) {
 884                 info->pending_bh |= BH_RECEIVE;
 885                 info->rx_frame_count++;
 886                 info->rx_put++;
 887                 if (info->rx_put >= info->rx_buf_count)
 888                         info->rx_put = 0;
 889         }
 890         issue_command(info, CHA, CMD_RXFIFO);
 891 }
 892
 893 static void rx_ready_async(MGSLPC_INFO *info, int tcd)
 894 {
 895         struct tty_port *port = &info->port;
 896         unsigned char data, status, flag;
 897         int fifo_count;
 898         int work = 0;
 899         struct mgsl_icount *icount = &info->icount;
 900
 901         if (tcd) {
 902                 /* early termination, get FIFO count from RBCL register */
 903                 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
 904
 905                 /* Zero fifo count could mean 0 or 32 bytes available.
 906                  * If BIT5 of STAR is set then at least 1 byte is available.
 907                  */
 908                 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
 909                         fifo_count = 32;
 910         } else
 911                 fifo_count = 32;
 912
 913         tty_buffer_request_room(port, fifo_count);
 914         /* Flush received async data to receive data buffer. */
 915         while (fifo_count) {
 916                 data   = read_reg(info, CHA + RXFIFO);
 917                 status = read_reg(info, CHA + RXFIFO);
 918                 fifo_count -= 2;
 919
 920                 icount->rx++;
 921                 flag = TTY_NORMAL;
 922
 923                 // if no frameing/crc error then save data
 924                 // BIT7:parity error
 925                 // BIT6:framing error
 926
 927                 if (status & (BIT7 + BIT6)) {
 928                         if (status & BIT7)
 929                                 icount->parity++;
 930                         else
 931                                 icount->frame++;
 932
 933                         /* discard char if tty control flags say so */
 934                         if (status & info->ignore_status_mask)
 935                                 continue;
 936
 937                         status &= info->read_status_mask;
 938
 939                         if (status & BIT7)
 940                                 flag = TTY_PARITY;
 941                         else if (status & BIT6)
 942                                 flag = TTY_FRAME;
 943                 }
 944                 work += tty_insert_flip_char(port, data, flag);
 945         }
 946         issue_command(info, CHA, CMD_RXFIFO);
 947
 948         if (debug_level >= DEBUG_LEVEL_ISR) {
 949                 printk("%s(%d):rx_ready_async",
 950                         __FILE__,__LINE__);
 951                 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
 952                         __FILE__,__LINE__,icount->rx,icount->brk,
 953                         icount->parity,icount->frame,icount->overrun);
 954         }
 955
 956         if (work)
 957                 tty_flip_buffer_push(port);
 958 }
 959
 960
 961 static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty)
 962 {
 963         if (!info->tx_active)
 964                 return;
 965
 966         info->tx_active = false;
 967         info->tx_aborting = false;
 968
 969         if (info->params.mode == MGSL_MODE_ASYNC)
 970                 return;
 971
 972         info->tx_count = info->tx_put = info->tx_get = 0;
 973         del_timer(&info->tx_timer);
 974
 975         if (info->drop_rts_on_tx_done) {
 976                 get_signals(info);
 977                 if (info->serial_signals & SerialSignal_RTS) {
 978                         info->serial_signals &= ~SerialSignal_RTS;
 979                         set_signals(info);
 980                 }
 981                 info->drop_rts_on_tx_done = false;
 982         }
 983
 984 #if SYNCLINK_GENERIC_HDLC
 985         if (info->netcount)
 986                 hdlcdev_tx_done(info);
 987         else
 988 #endif
 989         {
 990                 if (tty && (tty->stopped || tty->hw_stopped)) {
 991                         tx_stop(info);
 992                         return;
 993                 }
 994                 info->pending_bh |= BH_TRANSMIT;
 995         }
 996 }
 997
 998 static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty)
 999 {
1000         unsigned char fifo_count = 32;
1001         int c;
1002
1003         if (debug_level >= DEBUG_LEVEL_ISR)
1004                 printk("%s(%d):tx_ready(%s)\n", __FILE__, __LINE__, info->device_name);
1005
1006         if (info->params.mode == MGSL_MODE_HDLC) {
1007                 if (!info->tx_active)
1008                         return;
1009         } else {
1010                 if (tty && (tty->stopped || tty->hw_stopped)) {
1011                         tx_stop(info);
1012                         return;
1013                 }
1014                 if (!info->tx_count)
1015                         info->tx_active = false;
1016         }
1017
1018         if (!info->tx_count)
1019                 return;
1020
1021         while (info->tx_count && fifo_count) {
1022                 c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1023
1024                 if (c == 1) {
1025                         write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1026                 } else {
1027                         write_reg16(info, CHA + TXFIFO,
1028                                           *((unsigned short*)(info->tx_buf + info->tx_get)));
1029                 }
1030                 info->tx_count -= c;
1031                 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1032                 fifo_count -= c;
1033         }
1034
1035         if (info->params.mode == MGSL_MODE_ASYNC) {
1036                 if (info->tx_count < WAKEUP_CHARS)
1037                         info->pending_bh |= BH_TRANSMIT;
1038                 issue_command(info, CHA, CMD_TXFIFO);
1039         } else {
1040                 if (info->tx_count)
1041                         issue_command(info, CHA, CMD_TXFIFO);
1042                 else
1043                         issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1044         }
1045 }
1046
1047 static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty)
1048 {
1049         get_signals(info);
1050         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1051                 irq_disable(info, CHB, IRQ_CTS);
1052         info->icount.cts++;
1053         if (info->serial_signals & SerialSignal_CTS)
1054                 info->input_signal_events.cts_up++;
1055         else
1056                 info->input_signal_events.cts_down++;
1057         wake_up_interruptible(&info->status_event_wait_q);
1058         wake_up_interruptible(&info->event_wait_q);
1059
1060         if (tty && tty_port_cts_enabled(&info->port)) {
1061                 if (tty->hw_stopped) {
1062                         if (info->serial_signals & SerialSignal_CTS) {
1063                                 if (debug_level >= DEBUG_LEVEL_ISR)
1064                                         printk("CTS tx start...");
1065                                 tty->hw_stopped = 0;
1066                                 tx_start(info, tty);
1067                                 info->pending_bh |= BH_TRANSMIT;
1068                                 return;
1069                         }
1070                 } else {
1071                         if (!(info->serial_signals & SerialSignal_CTS)) {
1072                                 if (debug_level >= DEBUG_LEVEL_ISR)
1073                                         printk("CTS tx stop...");
1074                                 tty->hw_stopped = 1;
1075                                 tx_stop(info);
1076                         }
1077                 }
1078         }
1079         info->pending_bh |= BH_STATUS;
1080 }
1081
1082 static void dcd_change(MGSLPC_INFO *info, struct tty_struct *tty)
1083 {
1084         get_signals(info);
1085         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1086                 irq_disable(info, CHB, IRQ_DCD);
1087         info->icount.dcd++;
1088         if (info->serial_signals & SerialSignal_DCD) {
1089                 info->input_signal_events.dcd_up++;
1090         }
1091         else
1092                 info->input_signal_events.dcd_down++;
1093 #if SYNCLINK_GENERIC_HDLC
1094         if (info->netcount) {
1095                 if (info->serial_signals & SerialSignal_DCD)
1096                         netif_carrier_on(info->netdev);
1097                 else
1098                         netif_carrier_off(info->netdev);
1099         }
1100 #endif
1101         wake_up_interruptible(&info->status_event_wait_q);
1102         wake_up_interruptible(&info->event_wait_q);
1103
1104         if (info->port.flags & ASYNC_CHECK_CD) {
1105                 if (debug_level >= DEBUG_LEVEL_ISR)
1106                         printk("%s CD now %s...", info->device_name,
1107                                (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1108                 if (info->serial_signals & SerialSignal_DCD)
1109                         wake_up_interruptible(&info->port.open_wait);
1110                 else {
1111                         if (debug_level >= DEBUG_LEVEL_ISR)
1112                                 printk("doing serial hangup...");
1113                         if (tty)
1114                                 tty_hangup(tty);
1115                 }
1116         }
1117         info->pending_bh |= BH_STATUS;
1118 }
1119
1120 static void dsr_change(MGSLPC_INFO *info)
1121 {
1122         get_signals(info);
1123         if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1124                 port_irq_disable(info, PVR_DSR);
1125         info->icount.dsr++;
1126         if (info->serial_signals & SerialSignal_DSR)
1127                 info->input_signal_events.dsr_up++;
1128         else
1129                 info->input_signal_events.dsr_down++;
1130         wake_up_interruptible(&info->status_event_wait_q);
1131         wake_up_interruptible(&info->event_wait_q);
1132         info->pending_bh |= BH_STATUS;
1133 }
1134
1135 static void ri_change(MGSLPC_INFO *info)
1136 {
1137         get_signals(info);
1138         if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1139                 port_irq_disable(info, PVR_RI);
1140         info->icount.rng++;
1141         if (info->serial_signals & SerialSignal_RI)
1142                 info->input_signal_events.ri_up++;
1143         else
1144                 info->input_signal_events.ri_down++;
1145         wake_up_interruptible(&info->status_event_wait_q);
1146         wake_up_interruptible(&info->event_wait_q);
1147         info->pending_bh |= BH_STATUS;
1148 }
1149
1150 /* Interrupt service routine entry point.
1151  *
1152  * Arguments:
1153  *
1154  * irq     interrupt number that caused interrupt
1155  * dev_id  device ID supplied during interrupt registration
1156  */
1157 static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
1158 {
1159         MGSLPC_INFO *info = dev_id;
1160         struct tty_struct *tty;
1161         unsigned short isr;
1162         unsigned char gis, pis;
1163         int count=0;
1164
1165         if (debug_level >= DEBUG_LEVEL_ISR)
1166                 printk("mgslpc_isr(%d) entry.\n", info->irq_level);
1167
1168         if (!(info->p_dev->_locked))
1169                 return IRQ_HANDLED;
1170
1171         tty = tty_port_tty_get(&info->port);
1172
1173         spin_lock(&info->lock);
1174
1175         while ((gis = read_reg(info, CHA + GIS))) {
1176                 if (debug_level >= DEBUG_LEVEL_ISR)
1177                         printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1178
1179                 if ((gis & 0x70) || count > 1000) {
1180                         printk("synclink_cs:hardware failed or ejected\n");
1181                         break;
1182                 }
1183                 count++;
1184
1185                 if (gis & (BIT1 | BIT0)) {
1186                         isr = read_reg16(info, CHB + ISR);
1187                         if (isr & IRQ_DCD)
1188                                 dcd_change(info, tty);
1189                         if (isr & IRQ_CTS)
1190                                 cts_change(info, tty);
1191                 }
1192                 if (gis & (BIT3 | BIT2))
1193                 {
1194                         isr = read_reg16(info, CHA + ISR);
1195                         if (isr & IRQ_TIMER) {
1196                                 info->irq_occurred = true;
1197                                 irq_disable(info, CHA, IRQ_TIMER);
1198                         }
1199
1200                         /* receive IRQs */
1201                         if (isr & IRQ_EXITHUNT) {
1202                                 info->icount.exithunt++;
1203                                 wake_up_interruptible(&info->event_wait_q);
1204                         }
1205                         if (isr & IRQ_BREAK_ON) {
1206                                 info->icount.brk++;
1207                                 if (info->port.flags & ASYNC_SAK)
1208                                         do_SAK(tty);
1209                         }
1210                         if (isr & IRQ_RXTIME) {
1211                                 issue_command(info, CHA, CMD_RXFIFO_READ);
1212                         }
1213                         if (isr & (IRQ_RXEOM | IRQ_RXFIFO)) {
1214                                 if (info->params.mode == MGSL_MODE_HDLC)
1215                                         rx_ready_hdlc(info, isr & IRQ_RXEOM);
1216                                 else
1217                                         rx_ready_async(info, isr & IRQ_RXEOM);
1218                         }
1219
1220                         /* transmit IRQs */
1221                         if (isr & IRQ_UNDERRUN) {
1222                                 if (info->tx_aborting)
1223                                         info->icount.txabort++;
1224                                 else
1225                                         info->icount.txunder++;
1226                                 tx_done(info, tty);
1227                         }
1228                         else if (isr & IRQ_ALLSENT) {
1229                                 info->icount.txok++;
1230                                 tx_done(info, tty);
1231                         }
1232                         else if (isr & IRQ_TXFIFO)
1233                                 tx_ready(info, tty);
1234                 }
1235                 if (gis & BIT7) {
1236                         pis = read_reg(info, CHA + PIS);
1237                         if (pis & BIT1)
1238                                 dsr_change(info);
1239                         if (pis & BIT2)
1240                                 ri_change(info);
1241                 }
1242         }
1243
1244         /* Request bottom half processing if there's something
1245          * for it to do and the bh is not already running
1246          */
1247
1248         if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1249                 if (debug_level >= DEBUG_LEVEL_ISR)
1250                         printk("%s(%d):%s queueing bh task.\n",
1251                                 __FILE__,__LINE__,info->device_name);
1252                 schedule_work(&info->task);
1253                 info->bh_requested = true;
1254         }
1255
1256         spin_unlock(&info->lock);
1257         tty_kref_put(tty);
1258
1259         if (debug_level >= DEBUG_LEVEL_ISR)
1260                 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1261                        __FILE__, __LINE__, info->irq_level);
1262
1263         return IRQ_HANDLED;
1264 }
1265
1266 /* Initialize and start device.
1267  */
1268 static int startup(MGSLPC_INFO * info, struct tty_struct *tty)
1269 {
1270         int retval = 0;
1271
1272         if (debug_level >= DEBUG_LEVEL_INFO)
1273                 printk("%s(%d):startup(%s)\n", __FILE__, __LINE__, info->device_name);
1274
1275         if (info->port.flags & ASYNC_INITIALIZED)
1276                 return 0;
1277
1278         if (!info->tx_buf) {
1279                 /* allocate a page of memory for a transmit buffer */
1280                 info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1281                 if (!info->tx_buf) {
1282                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1283                                 __FILE__, __LINE__, info->device_name);
1284                         return -ENOMEM;
1285                 }
1286         }
1287
1288         info->pending_bh = 0;
1289
1290         memset(&info->icount, 0, sizeof(info->icount));
1291
1292         setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
1293
1294         /* Allocate and claim adapter resources */
1295         retval = claim_resources(info);
1296
1297         /* perform existence check and diagnostics */
1298         if (!retval)
1299                 retval = adapter_test(info);
1300
1301         if (retval) {
1302                 if (capable(CAP_SYS_ADMIN) && tty)
1303                         set_bit(TTY_IO_ERROR, &tty->flags);
1304                 release_resources(info);
1305                 return retval;
1306         }
1307
1308         /* program hardware for current parameters */
1309         mgslpc_change_params(info, tty);
1310
1311         if (tty)
1312                 clear_bit(TTY_IO_ERROR, &tty->flags);
1313
1314         info->port.flags |= ASYNC_INITIALIZED;
1315
1316         return 0;
1317 }
1318
1319 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1320  */
1321 static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty)
1322 {
1323         unsigned long flags;
1324
1325         if (!(info->port.flags & ASYNC_INITIALIZED))
1326                 return;
1327
1328         if (debug_level >= DEBUG_LEVEL_INFO)
1329                 printk("%s(%d):mgslpc_shutdown(%s)\n",
1330                          __FILE__, __LINE__, info->device_name);
1331
1332         /* clear status wait queue because status changes */
1333         /* can't happen after shutting down the hardware */
1334         wake_up_interruptible(&info->status_event_wait_q);
1335         wake_up_interruptible(&info->event_wait_q);
1336
1337         del_timer_sync(&info->tx_timer);
1338
1339         if (info->tx_buf) {
1340                 free_page((unsigned long) info->tx_buf);
1341                 info->tx_buf = NULL;
1342         }
1343
1344         spin_lock_irqsave(&info->lock, flags);
1345
1346         rx_stop(info);
1347         tx_stop(info);
1348
1349         /* TODO:disable interrupts instead of reset to preserve signal states */
1350         reset_device(info);
1351
1352         if (!tty || tty->termios.c_cflag & HUPCL) {
1353                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
1354                 set_signals(info);
1355         }
1356
1357         spin_unlock_irqrestore(&info->lock, flags);
1358
1359         release_resources(info);
1360
1361         if (tty)
1362                 set_bit(TTY_IO_ERROR, &tty->flags);
1363
1364         info->port.flags &= ~ASYNC_INITIALIZED;
1365 }
1366
1367 static void mgslpc_program_hw(MGSLPC_INFO *info, struct tty_struct *tty)
1368 {
1369         unsigned long flags;
1370
1371         spin_lock_irqsave(&info->lock, flags);
1372
1373         rx_stop(info);
1374         tx_stop(info);
1375         info->tx_count = info->tx_put = info->tx_get = 0;
1376
1377         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1378                 hdlc_mode(info);
1379         else
1380                 async_mode(info);
1381
1382         set_signals(info);
1383
1384         info->dcd_chkcount = 0;
1385         info->cts_chkcount = 0;
1386         info->ri_chkcount = 0;
1387         info->dsr_chkcount = 0;
1388
1389         irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1390         port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1391         get_signals(info);
1392
1393         if (info->netcount || (tty && (tty->termios.c_cflag & CREAD)))
1394                 rx_start(info);
1395
1396         spin_unlock_irqrestore(&info->lock, flags);
1397 }
1398
1399 /* Reconfigure adapter based on new parameters
1400  */
1401 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty)
1402 {
1403         unsigned cflag;
1404         int bits_per_char;
1405
1406         if (!tty)
1407                 return;
1408
1409         if (debug_level >= DEBUG_LEVEL_INFO)
1410                 printk("%s(%d):mgslpc_change_params(%s)\n",
1411                          __FILE__, __LINE__, info->device_name);
1412
1413         cflag = tty->termios.c_cflag;
1414
1415         /* if B0 rate (hangup) specified then negate RTS and DTR */
1416         /* otherwise assert RTS and DTR */
1417         if (cflag & CBAUD)
1418                 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
1419         else
1420                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
1421
1422         /* byte size and parity */
1423
1424         switch (cflag & CSIZE) {
1425         case CS5: info->params.data_bits = 5; break;
1426         case CS6: info->params.data_bits = 6; break;
1427         case CS7: info->params.data_bits = 7; break;
1428         case CS8: info->params.data_bits = 8; break;
1429         default:  info->params.data_bits = 7; break;
1430         }
1431
1432         if (cflag & CSTOPB)
1433                 info->params.stop_bits = 2;
1434         else
1435                 info->params.stop_bits = 1;
1436
1437         info->params.parity = ASYNC_PARITY_NONE;
1438         if (cflag & PARENB) {
1439                 if (cflag & PARODD)
1440                         info->params.parity = ASYNC_PARITY_ODD;
1441                 else
1442                         info->params.parity = ASYNC_PARITY_EVEN;
1443 #ifdef CMSPAR
1444                 if (cflag & CMSPAR)
1445                         info->params.parity = ASYNC_PARITY_SPACE;
1446 #endif
1447         }
1448
1449         /* calculate number of jiffies to transmit a full
1450          * FIFO (32 bytes) at specified data rate
1451          */
1452         bits_per_char = info->params.data_bits +
1453                         info->params.stop_bits + 1;
1454
1455         /* if port data rate is set to 460800 or less then
1456          * allow tty settings to override, otherwise keep the
1457          * current data rate.
1458          */
1459         if (info->params.data_rate <= 460800) {
1460                 info->params.data_rate = tty_get_baud_rate(tty);
1461         }
1462
1463         if (info->params.data_rate) {
1464                 info->timeout = (32*HZ*bits_per_char) /
1465                                 info->params.data_rate;
1466         }
1467         info->timeout += HZ/50;         /* Add .02 seconds of slop */
1468
1469         if (cflag & CRTSCTS)
1470                 info->port.flags |= ASYNC_CTS_FLOW;
1471         else
1472                 info->port.flags &= ~ASYNC_CTS_FLOW;
1473
1474         if (cflag & CLOCAL)
1475                 info->port.flags &= ~ASYNC_CHECK_CD;
1476         else
1477                 info->port.flags |= ASYNC_CHECK_CD;
1478
1479         /* process tty input control flags */
1480
1481         info->read_status_mask = 0;
1482         if (I_INPCK(tty))
1483                 info->read_status_mask |= BIT7 | BIT6;
1484         if (I_IGNPAR(tty))
1485                 info->ignore_status_mask |= BIT7 | BIT6;
1486
1487         mgslpc_program_hw(info, tty);
1488 }
1489
1490 /* Add a character to the transmit buffer
1491  */
1492 static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1493 {
1494         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1495         unsigned long flags;
1496
1497         if (debug_level >= DEBUG_LEVEL_INFO) {
1498                 printk("%s(%d):mgslpc_put_char(%d) on %s\n",
1499                         __FILE__, __LINE__, ch, info->device_name);
1500         }
1501
1502         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1503                 return 0;
1504
1505         if (!info->tx_buf)
1506                 return 0;
1507
1508         spin_lock_irqsave(&info->lock, flags);
1509
1510         if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1511                 if (info->tx_count < TXBUFSIZE - 1) {
1512                         info->tx_buf[info->tx_put++] = ch;
1513                         info->tx_put &= TXBUFSIZE-1;
1514                         info->tx_count++;
1515                 }
1516         }
1517
1518         spin_unlock_irqrestore(&info->lock, flags);
1519         return 1;
1520 }
1521
1522 /* Enable transmitter so remaining characters in the
1523  * transmit buffer are sent.
1524  */
1525 static void mgslpc_flush_chars(struct tty_struct *tty)
1526 {
1527         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1528         unsigned long flags;
1529
1530         if (debug_level >= DEBUG_LEVEL_INFO)
1531                 printk("%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1532                         __FILE__, __LINE__, info->device_name, info->tx_count);
1533
1534         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1535                 return;
1536
1537         if (info->tx_count <= 0 || tty->stopped ||
1538             tty->hw_stopped || !info->tx_buf)
1539                 return;
1540
1541         if (debug_level >= DEBUG_LEVEL_INFO)
1542                 printk("%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1543                         __FILE__, __LINE__, info->device_name);
1544
1545         spin_lock_irqsave(&info->lock, flags);
1546         if (!info->tx_active)
1547                 tx_start(info, tty);
1548         spin_unlock_irqrestore(&info->lock, flags);
1549 }
1550
1551 /* Send a block of data
1552  *
1553  * Arguments:
1554  *
1555  * tty        pointer to tty information structure
1556  * buf        pointer to buffer containing send data
1557  * count      size of send data in bytes
1558  *
1559  * Returns: number of characters written
1560  */
1561 static int mgslpc_write(struct tty_struct * tty,
1562                         const unsigned char *buf, int count)
1563 {
1564         int c, ret = 0;
1565         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1566         unsigned long flags;
1567
1568         if (debug_level >= DEBUG_LEVEL_INFO)
1569                 printk("%s(%d):mgslpc_write(%s) count=%d\n",
1570                         __FILE__, __LINE__, info->device_name, count);
1571
1572         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1573                 !info->tx_buf)
1574                 goto cleanup;
1575
1576         if (info->params.mode == MGSL_MODE_HDLC) {
1577                 if (count > TXBUFSIZE) {
1578                         ret = -EIO;
1579                         goto cleanup;
1580                 }
1581                 if (info->tx_active)
1582                         goto cleanup;
1583                 else if (info->tx_count)
1584                         goto start;
1585         }
1586
1587         for (;;) {
1588                 c = min(count,
1589                         min(TXBUFSIZE - info->tx_count - 1,
1590                             TXBUFSIZE - info->tx_put));
1591                 if (c <= 0)
1592                         break;
1593
1594                 memcpy(info->tx_buf + info->tx_put, buf, c);
1595
1596                 spin_lock_irqsave(&info->lock, flags);
1597                 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1598                 info->tx_count += c;
1599                 spin_unlock_irqrestore(&info->lock, flags);
1600
1601                 buf += c;
1602                 count -= c;
1603                 ret += c;
1604         }
1605 start:
1606         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1607                 spin_lock_irqsave(&info->lock, flags);
1608                 if (!info->tx_active)
1609                         tx_start(info, tty);
1610                 spin_unlock_irqrestore(&info->lock, flags);
1611         }
1612 cleanup:
1613         if (debug_level >= DEBUG_LEVEL_INFO)
1614                 printk("%s(%d):mgslpc_write(%s) returning=%d\n",
1615                         __FILE__, __LINE__, info->device_name, ret);
1616         return ret;
1617 }
1618
1619 /* Return the count of free bytes in transmit buffer
1620  */
1621 static int mgslpc_write_room(struct tty_struct *tty)
1622 {
1623         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1624         int ret;
1625
1626         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1627                 return 0;
1628
1629         if (info->params.mode == MGSL_MODE_HDLC) {
1630                 /* HDLC (frame oriented) mode */
1631                 if (info->tx_active)
1632                         return 0;
1633                 else
1634                         return HDLC_MAX_FRAME_SIZE;
1635         } else {
1636                 ret = TXBUFSIZE - info->tx_count - 1;
1637                 if (ret < 0)
1638                         ret = 0;
1639         }
1640
1641         if (debug_level >= DEBUG_LEVEL_INFO)
1642                 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1643                          __FILE__, __LINE__, info->device_name, ret);
1644         return ret;
1645 }
1646
1647 /* Return the count of bytes in transmit buffer
1648  */
1649 static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1650 {
1651         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1652         int rc;
1653
1654         if (debug_level >= DEBUG_LEVEL_INFO)
1655                 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1656                          __FILE__, __LINE__, info->device_name);
1657
1658         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1659                 return 0;
1660
1661         if (info->params.mode == MGSL_MODE_HDLC)
1662                 rc = info->tx_active ? info->max_frame_size : 0;
1663         else
1664                 rc = info->tx_count;
1665
1666         if (debug_level >= DEBUG_LEVEL_INFO)
1667                 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1668                          __FILE__, __LINE__, info->device_name, rc);
1669
1670         return rc;
1671 }
1672
1673 /* Discard all data in the send buffer
1674  */
1675 static void mgslpc_flush_buffer(struct tty_struct *tty)
1676 {
1677         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1678         unsigned long flags;
1679
1680         if (debug_level >= DEBUG_LEVEL_INFO)
1681                 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1682                          __FILE__, __LINE__, info->device_name);
1683
1684         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1685                 return;
1686
1687         spin_lock_irqsave(&info->lock, flags);
1688         info->tx_count = info->tx_put = info->tx_get = 0;
1689         del_timer(&info->tx_timer);
1690         spin_unlock_irqrestore(&info->lock, flags);
1691
1692         wake_up_interruptible(&tty->write_wait);
1693         tty_wakeup(tty);
1694 }
1695
1696 /* Send a high-priority XON/XOFF character
1697  */
1698 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1699 {
1700         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1701         unsigned long flags;
1702
1703         if (debug_level >= DEBUG_LEVEL_INFO)
1704                 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1705                          __FILE__, __LINE__, info->device_name, ch);
1706
1707         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1708                 return;
1709
1710         info->x_char = ch;
1711         if (ch) {
1712                 spin_lock_irqsave(&info->lock, flags);
1713                 if (!info->tx_enabled)
1714                         tx_start(info, tty);
1715                 spin_unlock_irqrestore(&info->lock, flags);
1716         }
1717 }
1718
1719 /* Signal remote device to throttle send data (our receive data)
1720  */
1721 static void mgslpc_throttle(struct tty_struct * tty)
1722 {
1723         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1724         unsigned long flags;
1725
1726         if (debug_level >= DEBUG_LEVEL_INFO)
1727                 printk("%s(%d):mgslpc_throttle(%s) entry\n",
1728                          __FILE__, __LINE__, info->device_name);
1729
1730         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1731                 return;
1732
1733         if (I_IXOFF(tty))
1734                 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1735
1736         if (tty->termios.c_cflag & CRTSCTS) {
1737                 spin_lock_irqsave(&info->lock, flags);
1738                 info->serial_signals &= ~SerialSignal_RTS;
1739                 set_signals(info);
1740                 spin_unlock_irqrestore(&info->lock, flags);
1741         }
1742 }
1743
1744 /* Signal remote device to stop throttling send data (our receive data)
1745  */
1746 static void mgslpc_unthrottle(struct tty_struct * tty)
1747 {
1748         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1749         unsigned long flags;
1750
1751         if (debug_level >= DEBUG_LEVEL_INFO)
1752                 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1753                          __FILE__, __LINE__, info->device_name);
1754
1755         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1756                 return;
1757
1758         if (I_IXOFF(tty)) {
1759                 if (info->x_char)
1760                         info->x_char = 0;
1761                 else
1762                         mgslpc_send_xchar(tty, START_CHAR(tty));
1763         }
1764
1765         if (tty->termios.c_cflag & CRTSCTS) {
1766                 spin_lock_irqsave(&info->lock, flags);
1767                 info->serial_signals |= SerialSignal_RTS;
1768                 set_signals(info);
1769                 spin_unlock_irqrestore(&info->lock, flags);
1770         }
1771 }
1772
1773 /* get the current serial statistics
1774  */
1775 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1776 {
1777         int err;
1778         if (debug_level >= DEBUG_LEVEL_INFO)
1779                 printk("get_params(%s)\n", info->device_name);
1780         if (!user_icount) {
1781                 memset(&info->icount, 0, sizeof(info->icount));
1782         } else {
1783                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1784                 if (err)
1785                         return -EFAULT;
1786         }
1787         return 0;
1788 }
1789
1790 /* get the current serial parameters
1791  */
1792 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1793 {
1794         int err;
1795         if (debug_level >= DEBUG_LEVEL_INFO)
1796                 printk("get_params(%s)\n", info->device_name);
1797         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1798         if (err)
1799                 return -EFAULT;
1800         return 0;
1801 }
1802
1803 /* set the serial parameters
1804  *
1805  * Arguments:
1806  *
1807  *      info            pointer to device instance data
1808  *      new_params      user buffer containing new serial params
1809  *
1810  * Returns:     0 if success, otherwise error code
1811  */
1812 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params, struct tty_struct *tty)
1813 {
1814         unsigned long flags;
1815         MGSL_PARAMS tmp_params;
1816         int err;
1817
1818         if (debug_level >= DEBUG_LEVEL_INFO)
1819                 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1820                         info->device_name);
1821         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1822         if (err) {
1823                 if (debug_level >= DEBUG_LEVEL_INFO)
1824                         printk("%s(%d):set_params(%s) user buffer copy failed\n",
1825                                 __FILE__, __LINE__, info->device_name);
1826                 return -EFAULT;
1827         }
1828
1829         spin_lock_irqsave(&info->lock, flags);
1830         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1831         spin_unlock_irqrestore(&info->lock, flags);
1832
1833         mgslpc_change_params(info, tty);
1834
1835         return 0;
1836 }
1837
1838 static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1839 {
1840         int err;
1841         if (debug_level >= DEBUG_LEVEL_INFO)
1842                 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1843         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1844         if (err)
1845                 return -EFAULT;
1846         return 0;
1847 }
1848
1849 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1850 {
1851         unsigned long flags;
1852         if (debug_level >= DEBUG_LEVEL_INFO)
1853                 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1854         spin_lock_irqsave(&info->lock, flags);
1855         info->idle_mode = idle_mode;
1856         tx_set_idle(info);
1857         spin_unlock_irqrestore(&info->lock, flags);
1858         return 0;
1859 }
1860
1861 static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1862 {
1863         int err;
1864         if (debug_level >= DEBUG_LEVEL_INFO)
1865                 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1866         COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1867         if (err)
1868                 return -EFAULT;
1869         return 0;
1870 }
1871
1872 static int set_interface(MGSLPC_INFO * info, int if_mode)
1873 {
1874         unsigned long flags;
1875         unsigned char val;
1876         if (debug_level >= DEBUG_LEVEL_INFO)
1877                 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1878         spin_lock_irqsave(&info->lock, flags);
1879         info->if_mode = if_mode;
1880
1881         val = read_reg(info, PVR) & 0x0f;
1882         switch (info->if_mode)
1883         {
1884         case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1885         case MGSL_INTERFACE_V35:   val |= PVR_V35;   break;
1886         case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1887         }
1888         write_reg(info, PVR, val);
1889
1890         spin_unlock_irqrestore(&info->lock, flags);
1891         return 0;
1892 }
1893
1894 static int set_txenable(MGSLPC_INFO * info, int enable, struct tty_struct *tty)
1895 {
1896         unsigned long flags;
1897
1898         if (debug_level >= DEBUG_LEVEL_INFO)
1899                 printk("set_txenable(%s,%d)\n", info->device_name, enable);
1900
1901         spin_lock_irqsave(&info->lock, flags);
1902         if (enable) {
1903                 if (!info->tx_enabled)
1904                         tx_start(info, tty);
1905         } else {
1906                 if (info->tx_enabled)
1907                         tx_stop(info);
1908         }
1909         spin_unlock_irqrestore(&info->lock, flags);
1910         return 0;
1911 }
1912
1913 static int tx_abort(MGSLPC_INFO * info)
1914 {
1915         unsigned long flags;
1916
1917         if (debug_level >= DEBUG_LEVEL_INFO)
1918                 printk("tx_abort(%s)\n", info->device_name);
1919
1920         spin_lock_irqsave(&info->lock, flags);
1921         if (info->tx_active && info->tx_count &&
1922             info->params.mode == MGSL_MODE_HDLC) {
1923                 /* clear data count so FIFO is not filled on next IRQ.
1924                  * This results in underrun and abort transmission.
1925                  */
1926                 info->tx_count = info->tx_put = info->tx_get = 0;
1927                 info->tx_aborting = true;
1928         }
1929         spin_unlock_irqrestore(&info->lock, flags);
1930         return 0;
1931 }
1932
1933 static int set_rxenable(MGSLPC_INFO * info, int enable)
1934 {
1935         unsigned long flags;
1936
1937         if (debug_level >= DEBUG_LEVEL_INFO)
1938                 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
1939
1940         spin_lock_irqsave(&info->lock, flags);
1941         if (enable) {
1942                 if (!info->rx_enabled)
1943                         rx_start(info);
1944         } else {
1945                 if (info->rx_enabled)
1946                         rx_stop(info);
1947         }
1948         spin_unlock_irqrestore(&info->lock, flags);
1949         return 0;
1950 }
1951
1952 /* wait for specified event to occur
1953  *
1954  * Arguments:           info    pointer to device instance data
1955  *                      mask    pointer to bitmask of events to wait for
1956  * Return Value:        0       if successful and bit mask updated with
1957  *                              of events triggerred,
1958  *                      otherwise error code
1959  */
1960 static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
1961 {
1962         unsigned long flags;
1963         int s;
1964         int rc=0;
1965         struct mgsl_icount cprev, cnow;
1966         int events;
1967         int mask;
1968         struct  _input_signal_events oldsigs, newsigs;
1969         DECLARE_WAITQUEUE(wait, current);
1970
1971         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
1972         if (rc)
1973                 return  -EFAULT;
1974
1975         if (debug_level >= DEBUG_LEVEL_INFO)
1976                 printk("wait_events(%s,%d)\n", info->device_name, mask);
1977
1978         spin_lock_irqsave(&info->lock, flags);
1979
1980         /* return immediately if state matches requested events */
1981         get_signals(info);
1982         s = info->serial_signals;
1983         events = mask &
1984                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
1985                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
1986                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
1987                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
1988         if (events) {
1989                 spin_unlock_irqrestore(&info->lock, flags);
1990                 goto exit;
1991         }
1992
1993         /* save current irq counts */
1994         cprev = info->icount;
1995         oldsigs = info->input_signal_events;
1996
1997         if ((info->params.mode == MGSL_MODE_HDLC) &&
1998             (mask & MgslEvent_ExitHuntMode))
1999                 irq_enable(info, CHA, IRQ_EXITHUNT);
2000
2001         set_current_state(TASK_INTERRUPTIBLE);
2002         add_wait_queue(&info->event_wait_q, &wait);
2003
2004         spin_unlock_irqrestore(&info->lock, flags);
2005
2006
2007         for(;;) {
2008                 schedule();
2009                 if (signal_pending(current)) {
2010                         rc = -ERESTARTSYS;
2011                         break;
2012                 }
2013
2014                 /* get current irq counts */
2015                 spin_lock_irqsave(&info->lock, flags);
2016                 cnow = info->icount;
2017                 newsigs = info->input_signal_events;
2018                 set_current_state(TASK_INTERRUPTIBLE);
2019                 spin_unlock_irqrestore(&info->lock, flags);
2020
2021                 /* if no change, wait aborted for some reason */
2022                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2023                     newsigs.dsr_down == oldsigs.dsr_down &&
2024                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2025                     newsigs.dcd_down == oldsigs.dcd_down &&
2026                     newsigs.cts_up   == oldsigs.cts_up   &&
2027                     newsigs.cts_down == oldsigs.cts_down &&
2028                     newsigs.ri_up    == oldsigs.ri_up    &&
2029                     newsigs.ri_down  == oldsigs.ri_down  &&
2030                     cnow.exithunt    == cprev.exithunt   &&
2031                     cnow.rxidle      == cprev.rxidle) {
2032                         rc = -EIO;
2033                         break;
2034                 }
2035
2036                 events = mask &
2037                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2038                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2039                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2040                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2041                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2042                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2043                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2044                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2045                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2046                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2047                 if (events)
2048                         break;
2049
2050                 cprev = cnow;
2051                 oldsigs = newsigs;
2052         }
2053
2054         remove_wait_queue(&info->event_wait_q, &wait);
2055         set_current_state(TASK_RUNNING);
2056
2057         if (mask & MgslEvent_ExitHuntMode) {
2058                 spin_lock_irqsave(&info->lock, flags);
2059                 if (!waitqueue_active(&info->event_wait_q))
2060                         irq_disable(info, CHA, IRQ_EXITHUNT);
2061                 spin_unlock_irqrestore(&info->lock, flags);
2062         }
2063 exit:
2064         if (rc == 0)
2065                 PUT_USER(rc, events, mask_ptr);
2066         return rc;
2067 }
2068
2069 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2070 {
2071         unsigned long flags;
2072         int rc;
2073         struct mgsl_icount cprev, cnow;
2074         DECLARE_WAITQUEUE(wait, current);
2075
2076         /* save current irq counts */
2077         spin_lock_irqsave(&info->lock, flags);
2078         cprev = info->icount;
2079         add_wait_queue(&info->status_event_wait_q, &wait);
2080         set_current_state(TASK_INTERRUPTIBLE);
2081         spin_unlock_irqrestore(&info->lock, flags);
2082
2083         for(;;) {
2084                 schedule();
2085                 if (signal_pending(current)) {
2086                         rc = -ERESTARTSYS;
2087                         break;
2088                 }
2089
2090                 /* get new irq counts */
2091                 spin_lock_irqsave(&info->lock, flags);
2092                 cnow = info->icount;
2093                 set_current_state(TASK_INTERRUPTIBLE);
2094                 spin_unlock_irqrestore(&info->lock, flags);
2095
2096                 /* if no change, wait aborted for some reason */
2097                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2098                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2099                         rc = -EIO;
2100                         break;
2101                 }
2102
2103                 /* check for change in caller specified modem input */
2104                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2105                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2106                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
2107                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2108                         rc = 0;
2109                         break;
2110                 }
2111
2112                 cprev = cnow;
2113         }
2114         remove_wait_queue(&info->status_event_wait_q, &wait);
2115         set_current_state(TASK_RUNNING);
2116         return rc;
2117 }
2118
2119 /* return the state of the serial control and status signals
2120  */
2121 static int tiocmget(struct tty_struct *tty)
2122 {
2123         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2124         unsigned int result;
2125         unsigned long flags;
2126
2127         spin_lock_irqsave(&info->lock, flags);
2128         get_signals(info);
2129         spin_unlock_irqrestore(&info->lock, flags);
2130
2131         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2132                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2133                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2134                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
2135                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2136                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2137
2138         if (debug_level >= DEBUG_LEVEL_INFO)
2139                 printk("%s(%d):%s tiocmget() value=%08X\n",
2140                          __FILE__, __LINE__, info->device_name, result);
2141         return result;
2142 }
2143
2144 /* set modem control signals (DTR/RTS)
2145  */
2146 static int tiocmset(struct tty_struct *tty,
2147                     unsigned int set, unsigned int clear)
2148 {
2149         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2150         unsigned long flags;
2151
2152         if (debug_level >= DEBUG_LEVEL_INFO)
2153                 printk("%s(%d):%s tiocmset(%x,%x)\n",
2154                         __FILE__, __LINE__, info->device_name, set, clear);
2155
2156         if (set & TIOCM_RTS)
2157                 info->serial_signals |= SerialSignal_RTS;
2158         if (set & TIOCM_DTR)
2159                 info->serial_signals |= SerialSignal_DTR;
2160         if (clear & TIOCM_RTS)
2161                 info->serial_signals &= ~SerialSignal_RTS;
2162         if (clear & TIOCM_DTR)
2163                 info->serial_signals &= ~SerialSignal_DTR;
2164
2165         spin_lock_irqsave(&info->lock, flags);
2166         set_signals(info);
2167         spin_unlock_irqrestore(&info->lock, flags);
2168
2169         return 0;
2170 }
2171
2172 /* Set or clear transmit break condition
2173  *
2174  * Arguments:           tty             pointer to tty instance data
2175  *                      break_state     -1=set break condition, 0=clear
2176  */
2177 static int mgslpc_break(struct tty_struct *tty, int break_state)
2178 {
2179         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2180         unsigned long flags;
2181
2182         if (debug_level >= DEBUG_LEVEL_INFO)
2183                 printk("%s(%d):mgslpc_break(%s,%d)\n",
2184                          __FILE__, __LINE__, info->device_name, break_state);
2185
2186         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
2187                 return -EINVAL;
2188
2189         spin_lock_irqsave(&info->lock, flags);
2190         if (break_state == -1)
2191                 set_reg_bits(info, CHA+DAFO, BIT6);
2192         else
2193                 clear_reg_bits(info, CHA+DAFO, BIT6);
2194         spin_unlock_irqrestore(&info->lock, flags);
2195         return 0;
2196 }
2197
2198 static int mgslpc_get_icount(struct tty_struct *tty,
2199                                 struct serial_icounter_struct *icount)
2200 {
2201         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2202         struct mgsl_icount cnow;        /* kernel counter temps */
2203         unsigned long flags;
2204
2205         spin_lock_irqsave(&info->lock, flags);
2206         cnow = info->icount;
2207         spin_unlock_irqrestore(&info->lock, flags);
2208
2209         icount->cts = cnow.cts;
2210         icount->dsr = cnow.dsr;
2211         icount->rng = cnow.rng;
2212         icount->dcd = cnow.dcd;
2213         icount->rx = cnow.rx;
2214         icount->tx = cnow.tx;
2215         icount->frame = cnow.frame;
2216         icount->overrun = cnow.overrun;
2217         icount->parity = cnow.parity;
2218         icount->brk = cnow.brk;
2219         icount->buf_overrun = cnow.buf_overrun;
2220
2221         return 0;
2222 }
2223
2224 /* Service an IOCTL request
2225  *
2226  * Arguments:
2227  *
2228  *      tty     pointer to tty instance data
2229  *      cmd     IOCTL command code
2230  *      arg     command argument/context
2231  *
2232  * Return Value:        0 if success, otherwise error code
2233  */
2234 static int mgslpc_ioctl(struct tty_struct *tty,
2235                         unsigned int cmd, unsigned long arg)
2236 {
2237         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2238         void __user *argp = (void __user *)arg;
2239
2240         if (debug_level >= DEBUG_LEVEL_INFO)
2241                 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__, __LINE__,
2242                         info->device_name, cmd);
2243
2244         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
2245                 return -ENODEV;
2246
2247         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2248             (cmd != TIOCMIWAIT)) {
2249                 if (tty->flags & (1 << TTY_IO_ERROR))
2250                     return -EIO;
2251         }
2252
2253         switch (cmd) {
2254         case MGSL_IOCGPARAMS:
2255                 return get_params(info, argp);
2256         case MGSL_IOCSPARAMS:
2257                 return set_params(info, argp, tty);
2258         case MGSL_IOCGTXIDLE:
2259                 return get_txidle(info, argp);
2260         case MGSL_IOCSTXIDLE:
2261                 return set_txidle(info, (int)arg);
2262         case MGSL_IOCGIF:
2263                 return get_interface(info, argp);
2264         case MGSL_IOCSIF:
2265                 return set_interface(info,(int)arg);
2266         case MGSL_IOCTXENABLE:
2267                 return set_txenable(info,(int)arg, tty);
2268         case MGSL_IOCRXENABLE:
2269                 return set_rxenable(info,(int)arg);
2270         case MGSL_IOCTXABORT:
2271                 return tx_abort(info);
2272         case MGSL_IOCGSTATS:
2273                 return get_stats(info, argp);
2274         case MGSL_IOCWAITEVENT:
2275                 return wait_events(info, argp);
2276         case TIOCMIWAIT:
2277                 return modem_input_wait(info,(int)arg);
2278         default:
2279                 return -ENOIOCTLCMD;
2280         }
2281         return 0;
2282 }
2283
2284 /* Set new termios settings
2285  *
2286  * Arguments:
2287  *
2288  *      tty             pointer to tty structure
2289  *      termios         pointer to buffer to hold returned old termios
2290  */
2291 static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2292 {
2293         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2294         unsigned long flags;
2295
2296         if (debug_level >= DEBUG_LEVEL_INFO)
2297                 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__, __LINE__,
2298                         tty->driver->name);
2299
2300         /* just return if nothing has changed */
2301         if ((tty->termios.c_cflag == old_termios->c_cflag)
2302             && (RELEVANT_IFLAG(tty->termios.c_iflag)
2303                 == RELEVANT_IFLAG(old_termios->c_iflag)))
2304           return;
2305
2306         mgslpc_change_params(info, tty);
2307
2308         /* Handle transition to B0 status */
2309         if (old_termios->c_cflag & CBAUD &&
2310             !(tty->termios.c_cflag & CBAUD)) {
2311                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2312                 spin_lock_irqsave(&info->lock, flags);
2313                 set_signals(info);
2314                 spin_unlock_irqrestore(&info->lock, flags);
2315         }
2316
2317         /* Handle transition away from B0 status */
2318         if (!(old_termios->c_cflag & CBAUD) &&
2319             tty->termios.c_cflag & CBAUD) {
2320                 info->serial_signals |= SerialSignal_DTR;
2321                 if (!(tty->termios.c_cflag & CRTSCTS) ||
2322                     !test_bit(TTY_THROTTLED, &tty->flags)) {
2323                         info->serial_signals |= SerialSignal_RTS;
2324                 }
2325                 spin_lock_irqsave(&info->lock, flags);
2326                 set_signals(info);
2327                 spin_unlock_irqrestore(&info->lock, flags);
2328         }
2329
2330         /* Handle turning off CRTSCTS */
2331         if (old_termios->c_cflag & CRTSCTS &&
2332             !(tty->termios.c_cflag & CRTSCTS)) {
2333                 tty->hw_stopped = 0;
2334                 tx_release(tty);
2335         }
2336 }
2337
2338 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2339 {
2340         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2341         struct tty_port *port = &info->port;
2342
2343         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
2344                 return;
2345
2346         if (debug_level >= DEBUG_LEVEL_INFO)
2347                 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2348                          __FILE__, __LINE__, info->device_name, port->count);
2349
2350         if (tty_port_close_start(port, tty, filp) == 0)
2351                 goto cleanup;
2352
2353         if (port->flags & ASYNC_INITIALIZED)
2354                 mgslpc_wait_until_sent(tty, info->timeout);
2355
2356         mgslpc_flush_buffer(tty);
2357
2358         tty_ldisc_flush(tty);
2359         shutdown(info, tty);
2360
2361         tty_port_close_end(port, tty);
2362         tty_port_tty_set(port, NULL);
2363 cleanup:
2364         if (debug_level >= DEBUG_LEVEL_INFO)
2365                 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__, __LINE__,
2366                         tty->driver->name, port->count);
2367 }
2368
2369 /* Wait until the transmitter is empty.
2370  */
2371 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2372 {
2373         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2374         unsigned long orig_jiffies, char_time;
2375
2376         if (!info)
2377                 return;
2378
2379         if (debug_level >= DEBUG_LEVEL_INFO)
2380                 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2381                          __FILE__, __LINE__, info->device_name);
2382
2383         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
2384                 return;
2385
2386         if (!(info->port.flags & ASYNC_INITIALIZED))
2387                 goto exit;
2388
2389         orig_jiffies = jiffies;
2390
2391         /* Set check interval to 1/5 of estimated time to
2392          * send a character, and make it at least 1. The check
2393          * interval should also be less than the timeout.
2394          * Note: use tight timings here to satisfy the NIST-PCTS.
2395          */
2396
2397         if (info->params.data_rate) {
2398                 char_time = info->timeout/(32 * 5);
2399                 if (!char_time)
2400                         char_time++;
2401         } else
2402                 char_time = 1;
2403
2404         if (timeout)
2405                 char_time = min_t(unsigned long, char_time, timeout);
2406
2407         if (info->params.mode == MGSL_MODE_HDLC) {
2408                 while (info->tx_active) {
2409                         msleep_interruptible(jiffies_to_msecs(char_time));
2410                         if (signal_pending(current))
2411                                 break;
2412                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2413                                 break;
2414                 }
2415         } else {
2416                 while ((info->tx_count || info->tx_active) &&
2417                         info->tx_enabled) {
2418                         msleep_interruptible(jiffies_to_msecs(char_time));
2419                         if (signal_pending(current))
2420                                 break;
2421                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2422                                 break;
2423                 }
2424         }
2425
2426 exit:
2427         if (debug_level >= DEBUG_LEVEL_INFO)
2428                 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2429                          __FILE__, __LINE__, info->device_name);
2430 }
2431
2432 /* Called by tty_hangup() when a hangup is signaled.
2433  * This is the same as closing all open files for the port.
2434  */
2435 static void mgslpc_hangup(struct tty_struct *tty)
2436 {
2437         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2438
2439         if (debug_level >= DEBUG_LEVEL_INFO)
2440                 printk("%s(%d):mgslpc_hangup(%s)\n",
2441                          __FILE__, __LINE__, info->device_name);
2442
2443         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
2444                 return;
2445
2446         mgslpc_flush_buffer(tty);
2447         shutdown(info, tty);
2448         tty_port_hangup(&info->port);
2449 }
2450
2451 static int carrier_raised(struct tty_port *port)
2452 {
2453         MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2454         unsigned long flags;
2455
2456         spin_lock_irqsave(&info->lock, flags);
2457         get_signals(info);
2458         spin_unlock_irqrestore(&info->lock, flags);
2459
2460         if (info->serial_signals & SerialSignal_DCD)
2461                 return 1;
2462         return 0;
2463 }
2464
2465 static void dtr_rts(struct tty_port *port, int onoff)
2466 {
2467         MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2468         unsigned long flags;
2469
2470         spin_lock_irqsave(&info->lock, flags);
2471         if (onoff)
2472                 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
2473         else
2474                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2475         set_signals(info);
2476         spin_unlock_irqrestore(&info->lock, flags);
2477 }
2478
2479
2480 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2481 {
2482         MGSLPC_INFO     *info;
2483         struct tty_port *port;
2484         int             retval, line;
2485         unsigned long   flags;
2486
2487         /* verify range of specified line number */
2488         line = tty->index;
2489         if (line >= mgslpc_device_count) {
2490                 printk("%s(%d):mgslpc_open with invalid line #%d.\n",
2491                         __FILE__, __LINE__, line);
2492                 return -ENODEV;
2493         }
2494
2495         /* find the info structure for the specified line */
2496         info = mgslpc_device_list;
2497         while(info && info->line != line)
2498                 info = info->next_device;
2499         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
2500                 return -ENODEV;
2501
2502         port = &info->port;
2503         tty->driver_data = info;
2504         tty_port_tty_set(port, tty);
2505
2506         if (debug_level >= DEBUG_LEVEL_INFO)
2507                 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2508                          __FILE__, __LINE__, tty->driver->name, port->count);
2509
2510         /* If port is closing, signal caller to try again */
2511         if (port->flags & ASYNC_CLOSING){
2512                 wait_event_interruptible_tty(tty, port->close_wait,
2513                                              !(port->flags & ASYNC_CLOSING));
2514                 retval = ((port->flags & ASYNC_HUP_NOTIFY) ?
2515                         -EAGAIN : -ERESTARTSYS);
2516                 goto cleanup;
2517         }
2518
2519         port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2520
2521         spin_lock_irqsave(&info->netlock, flags);
2522         if (info->netcount) {
2523                 retval = -EBUSY;
2524                 spin_unlock_irqrestore(&info->netlock, flags);
2525                 goto cleanup;
2526         }
2527         spin_lock(&port->lock);
2528         port->count++;
2529         spin_unlock(&port->lock);
2530         spin_unlock_irqrestore(&info->netlock, flags);
2531
2532         if (port->count == 1) {
2533                 /* 1st open on this device, init hardware */
2534                 retval = startup(info, tty);
2535                 if (retval < 0)
2536                         goto cleanup;
2537         }
2538
2539         retval = tty_port_block_til_ready(&info->port, tty, filp);
2540         if (retval) {
2541                 if (debug_level >= DEBUG_LEVEL_INFO)
2542                         printk("%s(%d):block_til_ready(%s) returned %d\n",
2543                                  __FILE__, __LINE__, info->device_name, retval);
2544                 goto cleanup;
2545         }
2546
2547         if (debug_level >= DEBUG_LEVEL_INFO)
2548                 printk("%s(%d):mgslpc_open(%s) success\n",
2549                          __FILE__, __LINE__, info->device_name);
2550         retval = 0;
2551
2552 cleanup:
2553         return retval;
2554 }
2555
2556 /*
2557  * /proc fs routines....
2558  */
2559
2560 static inline void line_info(struct seq_file *m, MGSLPC_INFO *info)
2561 {
2562         char    stat_buf[30];
2563         unsigned long flags;
2564
2565         seq_printf(m, "%s:io:%04X irq:%d",
2566                       info->device_name, info->io_base, info->irq_level);
2567
2568         /* output current serial signal states */
2569         spin_lock_irqsave(&info->lock, flags);
2570         get_signals(info);
2571         spin_unlock_irqrestore(&info->lock, flags);
2572
2573         stat_buf[0] = 0;
2574         stat_buf[1] = 0;
2575         if (info->serial_signals & SerialSignal_RTS)
2576                 strcat(stat_buf, "|RTS");
2577         if (info->serial_signals & SerialSignal_CTS)
2578                 strcat(stat_buf, "|CTS");
2579         if (info->serial_signals & SerialSignal_DTR)
2580                 strcat(stat_buf, "|DTR");
2581         if (info->serial_signals & SerialSignal_DSR)
2582                 strcat(stat_buf, "|DSR");
2583         if (info->serial_signals & SerialSignal_DCD)
2584                 strcat(stat_buf, "|CD");
2585         if (info->serial_signals & SerialSignal_RI)
2586                 strcat(stat_buf, "|RI");
2587
2588         if (info->params.mode == MGSL_MODE_HDLC) {
2589                 seq_printf(m, " HDLC txok:%d rxok:%d",
2590                               info->icount.txok, info->icount.rxok);
2591                 if (info->icount.txunder)
2592                         seq_printf(m, " txunder:%d", info->icount.txunder);
2593                 if (info->icount.txabort)
2594                         seq_printf(m, " txabort:%d", info->icount.txabort);
2595                 if (info->icount.rxshort)
2596                         seq_printf(m, " rxshort:%d", info->icount.rxshort);
2597                 if (info->icount.rxlong)
2598                         seq_printf(m, " rxlong:%d", info->icount.rxlong);
2599                 if (info->icount.rxover)
2600                         seq_printf(m, " rxover:%d", info->icount.rxover);
2601                 if (info->icount.rxcrc)
2602                         seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
2603         } else {
2604                 seq_printf(m, " ASYNC tx:%d rx:%d",
2605                               info->icount.tx, info->icount.rx);
2606                 if (info->icount.frame)
2607                         seq_printf(m, " fe:%d", info->icount.frame);
2608                 if (info->icount.parity)
2609                         seq_printf(m, " pe:%d", info->icount.parity);
2610                 if (info->icount.brk)
2611                         seq_printf(m, " brk:%d", info->icount.brk);
2612                 if (info->icount.overrun)
2613                         seq_printf(m, " oe:%d", info->icount.overrun);
2614         }
2615
2616         /* Append serial signal status to end */
2617         seq_printf(m, " %s\n", stat_buf+1);
2618
2619         seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
2620                        info->tx_active,info->bh_requested,info->bh_running,
2621                        info->pending_bh);
2622 }
2623
2624 /* Called to print information about devices
2625  */
2626 static int mgslpc_proc_show(struct seq_file *m, void *v)
2627 {
2628         MGSLPC_INFO *info;
2629
2630         seq_printf(m, "synclink driver:%s\n", driver_version);
2631
2632         info = mgslpc_device_list;
2633         while (info) {
2634                 line_info(m, info);
2635                 info = info->next_device;
2636         }
2637         return 0;
2638 }
2639
2640 static int mgslpc_proc_open(struct inode *inode, struct file *file)
2641 {
2642         return single_open(file, mgslpc_proc_show, NULL);
2643 }
2644
2645 static const struct file_operations mgslpc_proc_fops = {
2646         .owner          = THIS_MODULE,
2647         .open           = mgslpc_proc_open,
2648         .read           = seq_read,
2649         .llseek         = seq_lseek,
2650         .release        = single_release,
2651 };
2652
2653 static int rx_alloc_buffers(MGSLPC_INFO *info)
2654 {
2655         /* each buffer has header and data */
2656         info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2657
2658         /* calculate total allocation size for 8 buffers */
2659         info->rx_buf_total_size = info->rx_buf_size * 8;
2660
2661         /* limit total allocated memory */
2662         if (info->rx_buf_total_size > 0x10000)
2663                 info->rx_buf_total_size = 0x10000;
2664
2665         /* calculate number of buffers */
2666         info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2667
2668         info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2669         if (info->rx_buf == NULL)
2670                 return -ENOMEM;
2671
2672         /* unused flag buffer to satisfy receive_buf calling interface */
2673         info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
2674         if (!info->flag_buf) {
2675                 kfree(info->rx_buf);
2676                 info->rx_buf = NULL;
2677                 return -ENOMEM;
2678         }
2679
2680         rx_reset_buffers(info);
2681         return 0;
2682 }
2683
2684 static void rx_free_buffers(MGSLPC_INFO *info)
2685 {
2686         kfree(info->rx_buf);
2687         info->rx_buf = NULL;
2688         kfree(info->flag_buf);
2689         info->flag_buf = NULL;
2690 }
2691
2692 static int claim_resources(MGSLPC_INFO *info)
2693 {
2694         if (rx_alloc_buffers(info) < 0) {
2695                 printk("Can't allocate rx buffer %s\n", info->device_name);
2696                 release_resources(info);
2697                 return -ENODEV;
2698         }
2699         return 0;
2700 }
2701
2702 static void release_resources(MGSLPC_INFO *info)
2703 {
2704         if (debug_level >= DEBUG_LEVEL_INFO)
2705                 printk("release_resources(%s)\n", info->device_name);
2706         rx_free_buffers(info);
2707 }
2708
2709 /* Add the specified device instance data structure to the
2710  * global linked list of devices and increment the device count.
2711  *
2712  * Arguments:           info    pointer to device instance data
2713  */
2714 static int mgslpc_add_device(MGSLPC_INFO *info)
2715 {
2716         MGSLPC_INFO *current_dev = NULL;
2717         struct device *tty_dev;
2718         int ret;
2719
2720         info->next_device = NULL;
2721         info->line = mgslpc_device_count;
2722         sprintf(info->device_name,"ttySLP%d",info->line);
2723
2724         if (info->line < MAX_DEVICE_COUNT) {
2725                 if (maxframe[info->line])
2726                         info->max_frame_size = maxframe[info->line];
2727         }
2728
2729         mgslpc_device_count++;
2730
2731         if (!mgslpc_device_list)
2732                 mgslpc_device_list = info;
2733         else {
2734                 current_dev = mgslpc_device_list;
2735                 while (current_dev->next_device)
2736                         current_dev = current_dev->next_device;
2737                 current_dev->next_device = info;
2738         }
2739
2740         if (info->max_frame_size < 4096)
2741                 info->max_frame_size = 4096;
2742         else if (info->max_frame_size > 65535)
2743                 info->max_frame_size = 65535;
2744
2745         printk("SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2746                 info->device_name, info->io_base, info->irq_level);
2747
2748 #if SYNCLINK_GENERIC_HDLC
2749         ret = hdlcdev_init(info);
2750         if (ret != 0)
2751                 goto failed;
2752 #endif
2753
2754         tty_dev = tty_port_register_device(&info->port, serial_driver, info->line,
2755                         &info->p_dev->dev);
2756         if (IS_ERR(tty_dev)) {
2757                 ret = PTR_ERR(tty_dev);
2758 #if SYNCLINK_GENERIC_HDLC
2759                 hdlcdev_exit(info);
2760 #endif
2761                 goto failed;
2762         }
2763
2764         return 0;
2765
2766 failed:
2767         if (current_dev)
2768                 current_dev->next_device = NULL;
2769         else
2770                 mgslpc_device_list = NULL;
2771         mgslpc_device_count--;
2772         return ret;
2773 }
2774
2775 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2776 {
2777         MGSLPC_INFO *info = mgslpc_device_list;
2778         MGSLPC_INFO *last = NULL;
2779
2780         while(info) {
2781                 if (info == remove_info) {
2782                         if (last)
2783                                 last->next_device = info->next_device;
2784                         else
2785                                 mgslpc_device_list = info->next_device;
2786                         tty_unregister_device(serial_driver, info->line);
2787 #if SYNCLINK_GENERIC_HDLC
2788                         hdlcdev_exit(info);
2789 #endif
2790                         release_resources(info);
2791                         tty_port_destroy(&info->port);
2792                         kfree(info);
2793                         mgslpc_device_count--;
2794                         return;
2795                 }
2796                 last = info;
2797                 info = info->next_device;
2798         }
2799 }
2800
2801 static const struct pcmcia_device_id mgslpc_ids[] = {
2802         PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2803         PCMCIA_DEVICE_NULL
2804 };
2805 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2806
2807 static struct pcmcia_driver mgslpc_driver = {
2808         .owner          = THIS_MODULE,
2809         .name           = "synclink_cs",
2810         .probe          = mgslpc_probe,
2811         .remove         = mgslpc_detach,
2812         .id_table       = mgslpc_ids,
2813         .suspend        = mgslpc_suspend,
2814         .resume         = mgslpc_resume,
2815 };
2816
2817 static const struct tty_operations mgslpc_ops = {
2818         .open = mgslpc_open,
2819         .close = mgslpc_close,
2820         .write = mgslpc_write,
2821         .put_char = mgslpc_put_char,
2822         .flush_chars = mgslpc_flush_chars,
2823         .write_room = mgslpc_write_room,
2824         .chars_in_buffer = mgslpc_chars_in_buffer,
2825         .flush_buffer = mgslpc_flush_buffer,
2826         .ioctl = mgslpc_ioctl,
2827         .throttle = mgslpc_throttle,
2828         .unthrottle = mgslpc_unthrottle,
2829         .send_xchar = mgslpc_send_xchar,
2830         .break_ctl = mgslpc_break,
2831         .wait_until_sent = mgslpc_wait_until_sent,
2832         .set_termios = mgslpc_set_termios,
2833         .stop = tx_pause,
2834         .start = tx_release,
2835         .hangup = mgslpc_hangup,
2836         .tiocmget = tiocmget,
2837         .tiocmset = tiocmset,
2838         .get_icount = mgslpc_get_icount,
2839         .proc_fops = &mgslpc_proc_fops,
2840 };
2841
2842 static int __init synclink_cs_init(void)
2843 {
2844         int rc;
2845
2846         if (break_on_load) {
2847                 mgslpc_get_text_ptr();
2848                 BREAKPOINT();
2849         }
2850
2851         serial_driver = tty_alloc_driver(MAX_DEVICE_COUNT,
2852                         TTY_DRIVER_REAL_RAW |
2853                         TTY_DRIVER_DYNAMIC_DEV);
2854         if (IS_ERR(serial_driver)) {
2855                 rc = PTR_ERR(serial_driver);
2856                 goto err;
2857         }
2858
2859         /* Initialize the tty_driver structure */
2860         serial_driver->driver_name = "synclink_cs";
2861         serial_driver->name = "ttySLP";
2862         serial_driver->major = ttymajor;
2863         serial_driver->minor_start = 64;
2864         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2865         serial_driver->subtype = SERIAL_TYPE_NORMAL;
2866         serial_driver->init_termios = tty_std_termios;
2867         serial_driver->init_termios.c_cflag =
2868         B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2869         tty_set_operations(serial_driver, &mgslpc_ops);
2870
2871         rc = tty_register_driver(serial_driver);
2872         if (rc < 0) {
2873                 printk(KERN_ERR "%s(%d):Couldn't register serial driver\n",
2874                                 __FILE__, __LINE__);
2875                 goto err_put_tty;
2876         }
2877
2878         rc = pcmcia_register_driver(&mgslpc_driver);
2879         if (rc < 0)
2880                 goto err_unreg_tty;
2881
2882         printk(KERN_INFO "%s %s, tty major#%d\n", driver_name, driver_version,
2883                         serial_driver->major);
2884
2885         return 0;
2886 err_unreg_tty:
2887         tty_unregister_driver(serial_driver);
2888 err_put_tty:
2889         put_tty_driver(serial_driver);
2890 err:
2891         return rc;
2892 }
2893
2894 static void __exit synclink_cs_exit(void)
2895 {
2896         pcmcia_unregister_driver(&mgslpc_driver);
2897         tty_unregister_driver(serial_driver);
2898         put_tty_driver(serial_driver);
2899 }
2900
2901 module_init(synclink_cs_init);
2902 module_exit(synclink_cs_exit);
2903
2904 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
2905 {
2906         unsigned int M, N;
2907         unsigned char val;
2908
2909         /* note:standard BRG mode is broken in V3.2 chip
2910          * so enhanced mode is always used
2911          */
2912
2913         if (rate) {
2914                 N = 3686400 / rate;
2915                 if (!N)
2916                         N = 1;
2917                 N >>= 1;
2918                 for (M = 1; N > 64 && M < 16; M++)
2919                         N >>= 1;
2920                 N--;
2921
2922                 /* BGR[5..0] = N
2923                  * BGR[9..6] = M
2924                  * BGR[7..0] contained in BGR register
2925                  * BGR[9..8] contained in CCR2[7..6]
2926                  * divisor = (N+1)*2^M
2927                  *
2928                  * Note: M *must* not be zero (causes asymetric duty cycle)
2929                  */
2930                 write_reg(info, (unsigned char) (channel + BGR),
2931                                   (unsigned char) ((M << 6) + N));
2932                 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
2933                 val |= ((M << 4) & 0xc0);
2934                 write_reg(info, (unsigned char) (channel + CCR2), val);
2935         }
2936 }
2937
2938 /* Enabled the AUX clock output at the specified frequency.
2939  */
2940 static void enable_auxclk(MGSLPC_INFO *info)
2941 {
2942         unsigned char val;
2943
2944         /* MODE
2945          *
2946          * 07..06  MDS[1..0] 10 = transparent HDLC mode
2947          * 05      ADM Address Mode, 0 = no addr recognition
2948          * 04      TMD Timer Mode, 0 = external
2949          * 03      RAC Receiver Active, 0 = inactive
2950          * 02      RTS 0=RTS active during xmit, 1=RTS always active
2951          * 01      TRS Timer Resolution, 1=512
2952          * 00      TLP Test Loop, 0 = no loop
2953          *
2954          * 1000 0010
2955          */
2956         val = 0x82;
2957
2958         /* channel B RTS is used to enable AUXCLK driver on SP505 */
2959         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2960                 val |= BIT2;
2961         write_reg(info, CHB + MODE, val);
2962
2963         /* CCR0
2964          *
2965          * 07      PU Power Up, 1=active, 0=power down
2966          * 06      MCE Master Clock Enable, 1=enabled
2967          * 05      Reserved, 0
2968          * 04..02  SC[2..0] Encoding
2969          * 01..00  SM[1..0] Serial Mode, 00=HDLC
2970          *
2971          * 11000000
2972          */
2973         write_reg(info, CHB + CCR0, 0xc0);
2974
2975         /* CCR1
2976          *
2977          * 07      SFLG Shared Flag, 0 = disable shared flags
2978          * 06      GALP Go Active On Loop, 0 = not used
2979          * 05      GLP Go On Loop, 0 = not used
2980          * 04      ODS Output Driver Select, 1=TxD is push-pull output
2981          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
2982          * 02..00  CM[2..0] Clock Mode
2983          *
2984          * 0001 0111
2985          */
2986         write_reg(info, CHB + CCR1, 0x17);
2987
2988         /* CCR2 (Channel B)
2989          *
2990          * 07..06  BGR[9..8] Baud rate bits 9..8
2991          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
2992          * 04      SSEL Clock source select, 1=submode b
2993          * 03      TOE 0=TxCLK is input, 1=TxCLK is output
2994          * 02      RWX Read/Write Exchange 0=disabled
2995          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
2996          * 00      DIV, data inversion 0=disabled, 1=enabled
2997          *
2998          * 0011 1000
2999          */
3000         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3001                 write_reg(info, CHB + CCR2, 0x38);
3002         else
3003                 write_reg(info, CHB + CCR2, 0x30);
3004
3005         /* CCR4
3006          *
3007          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3008          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3009          * 05      TST1 Test Pin, 0=normal operation
3010          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3011          * 03..02  Reserved, must be 0
3012          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3013          *
3014          * 0101 0000
3015          */
3016         write_reg(info, CHB + CCR4, 0x50);
3017
3018         /* if auxclk not enabled, set internal BRG so
3019          * CTS transitions can be detected (requires TxC)
3020          */
3021         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3022                 mgslpc_set_rate(info, CHB, info->params.clock_speed);
3023         else
3024                 mgslpc_set_rate(info, CHB, 921600);
3025 }
3026
3027 static void loopback_enable(MGSLPC_INFO *info)
3028 {
3029         unsigned char val;
3030
3031         /* CCR1:02..00  CM[2..0] Clock Mode = 111 (clock mode 7) */
3032         val = read_reg(info, CHA + CCR1) | (BIT2 | BIT1 | BIT0);
3033         write_reg(info, CHA + CCR1, val);
3034
3035         /* CCR2:04 SSEL Clock source select, 1=submode b */
3036         val = read_reg(info, CHA + CCR2) | (BIT4 | BIT5);
3037         write_reg(info, CHA + CCR2, val);
3038
3039         /* set LinkSpeed if available, otherwise default to 2Mbps */
3040         if (info->params.clock_speed)
3041                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3042         else
3043                 mgslpc_set_rate(info, CHA, 1843200);
3044
3045         /* MODE:00 TLP Test Loop, 1=loopback enabled */
3046         val = read_reg(info, CHA + MODE) | BIT0;
3047         write_reg(info, CHA + MODE, val);
3048 }
3049
3050 static void hdlc_mode(MGSLPC_INFO *info)
3051 {
3052         unsigned char val;
3053         unsigned char clkmode, clksubmode;
3054
3055         /* disable all interrupts */
3056         irq_disable(info, CHA, 0xffff);
3057         irq_disable(info, CHB, 0xffff);
3058         port_irq_disable(info, 0xff);
3059
3060         /* assume clock mode 0a, rcv=RxC xmt=TxC */
3061         clkmode = clksubmode = 0;
3062         if (info->params.flags & HDLC_FLAG_RXC_DPLL
3063             && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3064                 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3065                 clkmode = 7;
3066         } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3067                  && info->params.flags & HDLC_FLAG_TXC_BRG) {
3068                 /* clock mode 7b, rcv = BRG, xmt = BRG */
3069                 clkmode = 7;
3070                 clksubmode = 1;
3071         } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3072                 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3073                         /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3074                         clkmode = 6;
3075                         clksubmode = 1;
3076                 } else {
3077                         /* clock mode 6a, rcv = DPLL, xmt = TxC */
3078                         clkmode = 6;
3079                 }
3080         } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3081                 /* clock mode 0b, rcv = RxC, xmt = BRG */
3082                 clksubmode = 1;
3083         }
3084
3085         /* MODE
3086          *
3087          * 07..06  MDS[1..0] 10 = transparent HDLC mode
3088          * 05      ADM Address Mode, 0 = no addr recognition
3089          * 04      TMD Timer Mode, 0 = external
3090          * 03      RAC Receiver Active, 0 = inactive
3091          * 02      RTS 0=RTS active during xmit, 1=RTS always active
3092          * 01      TRS Timer Resolution, 1=512
3093          * 00      TLP Test Loop, 0 = no loop
3094          *
3095          * 1000 0010
3096          */
3097         val = 0x82;
3098         if (info->params.loopback)
3099                 val |= BIT0;
3100
3101         /* preserve RTS state */
3102         if (info->serial_signals & SerialSignal_RTS)
3103                 val |= BIT2;
3104         write_reg(info, CHA + MODE, val);
3105
3106         /* CCR0
3107          *
3108          * 07      PU Power Up, 1=active, 0=power down
3109          * 06      MCE Master Clock Enable, 1=enabled
3110          * 05      Reserved, 0
3111          * 04..02  SC[2..0] Encoding
3112          * 01..00  SM[1..0] Serial Mode, 00=HDLC
3113          *
3114          * 11000000
3115          */
3116         val = 0xc0;
3117         switch (info->params.encoding)
3118         {
3119         case HDLC_ENCODING_NRZI:
3120                 val |= BIT3;
3121                 break;
3122         case HDLC_ENCODING_BIPHASE_SPACE:
3123                 val |= BIT4;
3124                 break;          // FM0
3125         case HDLC_ENCODING_BIPHASE_MARK:
3126                 val |= BIT4 | BIT2;
3127                 break;          // FM1
3128         case HDLC_ENCODING_BIPHASE_LEVEL:
3129                 val |= BIT4 | BIT3;
3130                 break;          // Manchester
3131         }
3132         write_reg(info, CHA + CCR0, val);
3133
3134         /* CCR1
3135          *
3136          * 07      SFLG Shared Flag, 0 = disable shared flags
3137          * 06      GALP Go Active On Loop, 0 = not used
3138          * 05      GLP Go On Loop, 0 = not used
3139          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3140          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
3141          * 02..00  CM[2..0] Clock Mode
3142          *
3143          * 0001 0000
3144          */
3145         val = 0x10 + clkmode;
3146         write_reg(info, CHA + CCR1, val);
3147
3148         /* CCR2
3149          *
3150          * 07..06  BGR[9..8] Baud rate bits 9..8
3151          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3152          * 04      SSEL Clock source select, 1=submode b
3153          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3154          * 02      RWX Read/Write Exchange 0=disabled
3155          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
3156          * 00      DIV, data inversion 0=disabled, 1=enabled
3157          *
3158          * 0000 0000
3159          */
3160         val = 0x00;
3161         if (clkmode == 2 || clkmode == 3 || clkmode == 6
3162             || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3163                 val |= BIT5;
3164         if (clksubmode)
3165                 val |= BIT4;
3166         if (info->params.crc_type == HDLC_CRC_32_CCITT)
3167                 val |= BIT1;
3168         if (info->params.encoding == HDLC_ENCODING_NRZB)
3169                 val |= BIT0;
3170         write_reg(info, CHA + CCR2, val);
3171
3172         /* CCR3
3173          *
3174          * 07..06  PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3175          * 05      EPT Enable preamble transmission, 1=enabled
3176          * 04      RADD Receive address pushed to FIFO, 0=disabled
3177          * 03      CRL CRC Reset Level, 0=FFFF
3178          * 02      RCRC Rx CRC 0=On 1=Off
3179          * 01      TCRC Tx CRC 0=On 1=Off
3180          * 00      PSD DPLL Phase Shift Disable
3181          *
3182          * 0000 0000
3183          */
3184         val = 0x00;
3185         if (info->params.crc_type == HDLC_CRC_NONE)
3186                 val |= BIT2 | BIT1;
3187         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3188                 val |= BIT5;
3189         switch (info->params.preamble_length)
3190         {
3191         case HDLC_PREAMBLE_LENGTH_16BITS:
3192                 val |= BIT6;
3193                 break;
3194         case HDLC_PREAMBLE_LENGTH_32BITS:
3195                 val |= BIT6;
3196                 break;
3197         case HDLC_PREAMBLE_LENGTH_64BITS:
3198                 val |= BIT7 | BIT6;
3199                 break;
3200         }
3201         write_reg(info, CHA + CCR3, val);
3202
3203         /* PRE - Preamble pattern */
3204         val = 0;
3205         switch (info->params.preamble)
3206         {
3207         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3208         case HDLC_PREAMBLE_PATTERN_10:    val = 0xaa; break;
3209         case HDLC_PREAMBLE_PATTERN_01:    val = 0x55; break;
3210         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
3211         }
3212         write_reg(info, CHA + PRE, val);
3213
3214         /* CCR4
3215          *
3216          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3217          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3218          * 05      TST1 Test Pin, 0=normal operation
3219          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3220          * 03..02  Reserved, must be 0
3221          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3222          *
3223          * 0101 0000
3224          */
3225         val = 0x50;
3226         write_reg(info, CHA + CCR4, val);
3227         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3228                 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3229         else
3230                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3231
3232         /* RLCR Receive length check register
3233          *
3234          * 7     1=enable receive length check
3235          * 6..0  Max frame length = (RL + 1) * 32
3236          */
3237         write_reg(info, CHA + RLCR, 0);
3238
3239         /* XBCH Transmit Byte Count High
3240          *
3241          * 07      DMA mode, 0 = interrupt driven
3242          * 06      NRM, 0=ABM (ignored)
3243          * 05      CAS Carrier Auto Start
3244          * 04      XC Transmit Continuously (ignored)
3245          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3246          *
3247          * 0000 0000
3248          */
3249         val = 0x00;
3250         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3251                 val |= BIT5;
3252         write_reg(info, CHA + XBCH, val);
3253         enable_auxclk(info);
3254         if (info->params.loopback || info->testing_irq)
3255                 loopback_enable(info);
3256         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3257         {
3258                 irq_enable(info, CHB, IRQ_CTS);
3259                 /* PVR[3] 1=AUTO CTS active */
3260                 set_reg_bits(info, CHA + PVR, BIT3);
3261         } else
3262                 clear_reg_bits(info, CHA + PVR, BIT3);
3263
3264         irq_enable(info, CHA,
3265                          IRQ_RXEOM | IRQ_RXFIFO | IRQ_ALLSENT |
3266                          IRQ_UNDERRUN | IRQ_TXFIFO);
3267         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3268         wait_command_complete(info, CHA);
3269         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3270
3271         /* Master clock mode enabled above to allow reset commands
3272          * to complete even if no data clocks are present.
3273          *
3274          * Disable master clock mode for normal communications because
3275          * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3276          * IRQ when in master clock mode.
3277          *
3278          * Leave master clock mode enabled for IRQ test because the
3279          * timer IRQ used by the test can only happen in master clock mode.
3280          */
3281         if (!info->testing_irq)
3282                 clear_reg_bits(info, CHA + CCR0, BIT6);
3283
3284         tx_set_idle(info);
3285
3286         tx_stop(info);
3287         rx_stop(info);
3288 }
3289
3290 static void rx_stop(MGSLPC_INFO *info)
3291 {
3292         if (debug_level >= DEBUG_LEVEL_ISR)
3293                 printk("%s(%d):rx_stop(%s)\n",
3294                          __FILE__, __LINE__, info->device_name);
3295
3296         /* MODE:03 RAC Receiver Active, 0=inactive */
3297         clear_reg_bits(info, CHA + MODE, BIT3);
3298
3299         info->rx_enabled = false;
3300         info->rx_overflow = false;
3301 }
3302
3303 static void rx_start(MGSLPC_INFO *info)
3304 {
3305         if (debug_level >= DEBUG_LEVEL_ISR)
3306                 printk("%s(%d):rx_start(%s)\n",
3307                          __FILE__, __LINE__, info->device_name);
3308
3309         rx_reset_buffers(info);
3310         info->rx_enabled = false;
3311         info->rx_overflow = false;
3312
3313         /* MODE:03 RAC Receiver Active, 1=active */
3314         set_reg_bits(info, CHA + MODE, BIT3);
3315
3316         info->rx_enabled = true;
3317 }
3318
3319 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty)
3320 {
3321         if (debug_level >= DEBUG_LEVEL_ISR)
3322                 printk("%s(%d):tx_start(%s)\n",
3323                          __FILE__, __LINE__, info->device_name);
3324
3325         if (info->tx_count) {
3326                 /* If auto RTS enabled and RTS is inactive, then assert */
3327                 /* RTS and set a flag indicating that the driver should */
3328                 /* negate RTS when the transmission completes. */
3329                 info->drop_rts_on_tx_done = false;
3330
3331                 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3332                         get_signals(info);
3333                         if (!(info->serial_signals & SerialSignal_RTS)) {
3334                                 info->serial_signals |= SerialSignal_RTS;
3335                                 set_signals(info);
3336                                 info->drop_rts_on_tx_done = true;
3337                         }
3338                 }
3339
3340                 if (info->params.mode == MGSL_MODE_ASYNC) {
3341                         if (!info->tx_active) {
3342                                 info->tx_active = true;
3343                                 tx_ready(info, tty);
3344                         }
3345                 } else {
3346                         info->tx_active = true;
3347                         tx_ready(info, tty);
3348                         mod_timer(&info->tx_timer, jiffies +
3349                                         msecs_to_jiffies(5000));
3350                 }
3351         }
3352
3353         if (!info->tx_enabled)
3354                 info->tx_enabled = true;
3355 }
3356
3357 static void tx_stop(MGSLPC_INFO *info)
3358 {
3359         if (debug_level >= DEBUG_LEVEL_ISR)
3360                 printk("%s(%d):tx_stop(%s)\n",
3361                          __FILE__, __LINE__, info->device_name);
3362
3363         del_timer(&info->tx_timer);
3364
3365         info->tx_enabled = false;
3366         info->tx_active = false;
3367 }
3368
3369 /* Reset the adapter to a known state and prepare it for further use.
3370  */
3371 static void reset_device(MGSLPC_INFO *info)
3372 {
3373         /* power up both channels (set BIT7) */
3374         write_reg(info, CHA + CCR0, 0x80);
3375         write_reg(info, CHB + CCR0, 0x80);
3376         write_reg(info, CHA + MODE, 0);
3377         write_reg(info, CHB + MODE, 0);
3378
3379         /* disable all interrupts */
3380         irq_disable(info, CHA, 0xffff);
3381         irq_disable(info, CHB, 0xffff);
3382         port_irq_disable(info, 0xff);
3383
3384         /* PCR Port Configuration Register
3385          *
3386          * 07..04  DEC[3..0] Serial I/F select outputs
3387          * 03      output, 1=AUTO CTS control enabled
3388          * 02      RI Ring Indicator input 0=active
3389          * 01      DSR input 0=active
3390          * 00      DTR output 0=active
3391          *
3392          * 0000 0110
3393          */
3394         write_reg(info, PCR, 0x06);
3395
3396         /* PVR Port Value Register
3397          *
3398          * 07..04  DEC[3..0] Serial I/F select (0000=disabled)
3399          * 03      AUTO CTS output 1=enabled
3400          * 02      RI Ring Indicator input
3401          * 01      DSR input
3402          * 00      DTR output (1=inactive)
3403          *
3404          * 0000 0001
3405          */
3406 //      write_reg(info, PVR, PVR_DTR);
3407
3408         /* IPC Interrupt Port Configuration
3409          *
3410          * 07      VIS 1=Masked interrupts visible
3411          * 06..05  Reserved, 0
3412          * 04..03  SLA Slave address, 00 ignored
3413          * 02      CASM Cascading Mode, 1=daisy chain
3414          * 01..00  IC[1..0] Interrupt Config, 01=push-pull output, active low
3415          *
3416          * 0000 0101
3417          */
3418         write_reg(info, IPC, 0x05);
3419 }
3420
3421 static void async_mode(MGSLPC_INFO *info)
3422 {
3423         unsigned char val;
3424
3425         /* disable all interrupts */
3426         irq_disable(info, CHA, 0xffff);
3427         irq_disable(info, CHB, 0xffff);
3428         port_irq_disable(info, 0xff);
3429
3430         /* MODE
3431          *
3432          * 07      Reserved, 0
3433          * 06      FRTS RTS State, 0=active
3434          * 05      FCTS Flow Control on CTS
3435          * 04      FLON Flow Control Enable
3436          * 03      RAC Receiver Active, 0 = inactive
3437          * 02      RTS 0=Auto RTS, 1=manual RTS
3438          * 01      TRS Timer Resolution, 1=512
3439          * 00      TLP Test Loop, 0 = no loop
3440          *
3441          * 0000 0110
3442          */
3443         val = 0x06;
3444         if (info->params.loopback)
3445                 val |= BIT0;
3446
3447         /* preserve RTS state */
3448         if (!(info->serial_signals & SerialSignal_RTS))
3449                 val |= BIT6;
3450         write_reg(info, CHA + MODE, val);
3451
3452         /* CCR0
3453          *
3454          * 07      PU Power Up, 1=active, 0=power down
3455          * 06      MCE Master Clock Enable, 1=enabled
3456          * 05      Reserved, 0
3457          * 04..02  SC[2..0] Encoding, 000=NRZ
3458          * 01..00  SM[1..0] Serial Mode, 11=Async
3459          *
3460          * 1000 0011
3461          */
3462         write_reg(info, CHA + CCR0, 0x83);
3463
3464         /* CCR1
3465          *
3466          * 07..05  Reserved, 0
3467          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3468          * 03      BCR Bit Clock Rate, 1=16x
3469          * 02..00  CM[2..0] Clock Mode, 111=BRG
3470          *
3471          * 0001 1111
3472          */
3473         write_reg(info, CHA + CCR1, 0x1f);
3474
3475         /* CCR2 (channel A)
3476          *
3477          * 07..06  BGR[9..8] Baud rate bits 9..8
3478          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3479          * 04      SSEL Clock source select, 1=submode b
3480          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3481          * 02      RWX Read/Write Exchange 0=disabled
3482          * 01      Reserved, 0
3483          * 00      DIV, data inversion 0=disabled, 1=enabled
3484          *
3485          * 0001 0000
3486          */
3487         write_reg(info, CHA + CCR2, 0x10);
3488
3489         /* CCR3
3490          *
3491          * 07..01  Reserved, 0
3492          * 00      PSD DPLL Phase Shift Disable
3493          *
3494          * 0000 0000
3495          */
3496         write_reg(info, CHA + CCR3, 0);
3497
3498         /* CCR4
3499          *
3500          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3501          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3502          * 05      TST1 Test Pin, 0=normal operation
3503          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3504          * 03..00  Reserved, must be 0
3505          *
3506          * 0101 0000
3507          */
3508         write_reg(info, CHA + CCR4, 0x50);
3509         mgslpc_set_rate(info, CHA, info->params.data_rate * 16);
3510
3511         /* DAFO Data Format
3512          *
3513          * 07      Reserved, 0
3514          * 06      XBRK transmit break, 0=normal operation
3515          * 05      Stop bits (0=1, 1=2)
3516          * 04..03  PAR[1..0] Parity (01=odd, 10=even)
3517          * 02      PAREN Parity Enable
3518          * 01..00  CHL[1..0] Character Length (00=8, 01=7)
3519          *
3520          */
3521         val = 0x00;
3522         if (info->params.data_bits != 8)
3523                 val |= BIT0;    /* 7 bits */
3524         if (info->params.stop_bits != 1)
3525                 val |= BIT5;
3526         if (info->params.parity != ASYNC_PARITY_NONE)
3527         {
3528                 val |= BIT2;    /* Parity enable */
3529                 if (info->params.parity == ASYNC_PARITY_ODD)
3530                         val |= BIT3;
3531                 else
3532                         val |= BIT4;
3533         }
3534         write_reg(info, CHA + DAFO, val);
3535
3536         /* RFC Rx FIFO Control
3537          *
3538          * 07      Reserved, 0
3539          * 06      DPS, 1=parity bit not stored in data byte
3540          * 05      DXS, 0=all data stored in FIFO (including XON/XOFF)
3541          * 04      RFDF Rx FIFO Data Format, 1=status byte stored in FIFO
3542          * 03..02  RFTH[1..0], rx threshold, 11=16 status + 16 data byte
3543          * 01      Reserved, 0
3544          * 00      TCDE Terminate Char Detect Enable, 0=disabled
3545          *
3546          * 0101 1100
3547          */
3548         write_reg(info, CHA + RFC, 0x5c);
3549
3550         /* RLCR Receive length check register
3551          *
3552          * Max frame length = (RL + 1) * 32
3553          */
3554         write_reg(info, CHA + RLCR, 0);
3555
3556         /* XBCH Transmit Byte Count High
3557          *
3558          * 07      DMA mode, 0 = interrupt driven
3559          * 06      NRM, 0=ABM (ignored)
3560          * 05      CAS Carrier Auto Start
3561          * 04      XC Transmit Continuously (ignored)
3562          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3563          *
3564          * 0000 0000
3565          */
3566         val = 0x00;
3567         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3568                 val |= BIT5;
3569         write_reg(info, CHA + XBCH, val);
3570         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3571                 irq_enable(info, CHA, IRQ_CTS);
3572
3573         /* MODE:03 RAC Receiver Active, 1=active */
3574         set_reg_bits(info, CHA + MODE, BIT3);
3575         enable_auxclk(info);
3576         if (info->params.flags & HDLC_FLAG_AUTO_CTS) {
3577                 irq_enable(info, CHB, IRQ_CTS);
3578                 /* PVR[3] 1=AUTO CTS active */
3579                 set_reg_bits(info, CHA + PVR, BIT3);
3580         } else
3581                 clear_reg_bits(info, CHA + PVR, BIT3);
3582         irq_enable(info, CHA,
3583                           IRQ_RXEOM | IRQ_RXFIFO | IRQ_BREAK_ON | IRQ_RXTIME |
3584                           IRQ_ALLSENT | IRQ_TXFIFO);
3585         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3586         wait_command_complete(info, CHA);
3587         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3588 }
3589
3590 /* Set the HDLC idle mode for the transmitter.
3591  */
3592 static void tx_set_idle(MGSLPC_INFO *info)
3593 {
3594         /* Note: ESCC2 only supports flags and one idle modes */
3595         if (info->idle_mode == HDLC_TXIDLE_FLAGS)
3596                 set_reg_bits(info, CHA + CCR1, BIT3);
3597         else
3598                 clear_reg_bits(info, CHA + CCR1, BIT3);
3599 }
3600
3601 /* get state of the V24 status (input) signals.
3602  */
3603 static void get_signals(MGSLPC_INFO *info)
3604 {
3605         unsigned char status = 0;
3606
3607         /* preserve RTS and DTR */
3608         info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR;
3609
3610         if (read_reg(info, CHB + VSTR) & BIT7)
3611                 info->serial_signals |= SerialSignal_DCD;
3612         if (read_reg(info, CHB + STAR) & BIT1)
3613                 info->serial_signals |= SerialSignal_CTS;
3614
3615         status = read_reg(info, CHA + PVR);
3616         if (!(status & PVR_RI))
3617                 info->serial_signals |= SerialSignal_RI;
3618         if (!(status & PVR_DSR))
3619                 info->serial_signals |= SerialSignal_DSR;
3620 }
3621
3622 /* Set the state of RTS and DTR based on contents of
3623  * serial_signals member of device extension.
3624  */
3625 static void set_signals(MGSLPC_INFO *info)
3626 {
3627         unsigned char val;
3628
3629         val = read_reg(info, CHA + MODE);
3630         if (info->params.mode == MGSL_MODE_ASYNC) {
3631                 if (info->serial_signals & SerialSignal_RTS)
3632                         val &= ~BIT6;
3633                 else
3634                         val |= BIT6;
3635         } else {
3636                 if (info->serial_signals & SerialSignal_RTS)
3637                         val |= BIT2;
3638                 else
3639                         val &= ~BIT2;
3640         }
3641         write_reg(info, CHA + MODE, val);
3642
3643         if (info->serial_signals & SerialSignal_DTR)
3644                 clear_reg_bits(info, CHA + PVR, PVR_DTR);
3645         else
3646                 set_reg_bits(info, CHA + PVR, PVR_DTR);
3647 }
3648
3649 static void rx_reset_buffers(MGSLPC_INFO *info)
3650 {
3651         RXBUF *buf;
3652         int i;
3653
3654         info->rx_put = 0;
3655         info->rx_get = 0;
3656         info->rx_frame_count = 0;
3657         for (i=0 ; i < info->rx_buf_count ; i++) {
3658                 buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size));
3659                 buf->status = buf->count = 0;
3660         }
3661 }
3662
3663 /* Attempt to return a received HDLC frame
3664  * Only frames received without errors are returned.
3665  *
3666  * Returns true if frame returned, otherwise false
3667  */
3668 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty)
3669 {
3670         unsigned short status;
3671         RXBUF *buf;
3672         unsigned int framesize = 0;
3673         unsigned long flags;
3674         bool return_frame = false;
3675
3676         if (info->rx_frame_count == 0)
3677                 return false;
3678
3679         buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size));
3680
3681         status = buf->status;
3682
3683         /* 07  VFR  1=valid frame
3684          * 06  RDO  1=data overrun
3685          * 05  CRC  1=OK, 0=error
3686          * 04  RAB  1=frame aborted
3687          */
3688         if ((status & 0xf0) != 0xA0) {
3689                 if (!(status & BIT7) || (status & BIT4))
3690                         info->icount.rxabort++;
3691                 else if (status & BIT6)
3692                         info->icount.rxover++;
3693                 else if (!(status & BIT5)) {
3694                         info->icount.rxcrc++;
3695                         if (info->params.crc_type & HDLC_CRC_RETURN_EX)
3696                                 return_frame = true;
3697                 }
3698                 framesize = 0;
3699 #if SYNCLINK_GENERIC_HDLC
3700                 {
3701                         info->netdev->stats.rx_errors++;
3702                         info->netdev->stats.rx_frame_errors++;
3703                 }
3704 #endif
3705         } else
3706                 return_frame = true;
3707
3708         if (return_frame)
3709                 framesize = buf->count;
3710
3711         if (debug_level >= DEBUG_LEVEL_BH)
3712                 printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n",
3713                         __FILE__, __LINE__, info->device_name, status, framesize);
3714
3715         if (debug_level >= DEBUG_LEVEL_DATA)
3716                 trace_block(info, buf->data, framesize, 0);
3717
3718         if (framesize) {
3719                 if ((info->params.crc_type & HDLC_CRC_RETURN_EX &&
3720                       framesize+1 > info->max_frame_size) ||
3721                     framesize > info->max_frame_size)
3722                         info->icount.rxlong++;
3723                 else {
3724                         if (status & BIT5)
3725                                 info->icount.rxok++;
3726
3727                         if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
3728                                 *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR;
3729                                 ++framesize;
3730                         }
3731
3732 #if SYNCLINK_GENERIC_HDLC
3733                         if (info->netcount)
3734                                 hdlcdev_rx(info, buf->data, framesize);
3735                         else
3736 #endif
3737                                 ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize);
3738                 }
3739         }
3740
3741         spin_lock_irqsave(&info->lock, flags);
3742         buf->status = buf->count = 0;
3743         info->rx_frame_count--;
3744         info->rx_get++;
3745         if (info->rx_get >= info->rx_buf_count)
3746                 info->rx_get = 0;
3747         spin_unlock_irqrestore(&info->lock, flags);
3748
3749         return true;
3750 }
3751
3752 static bool register_test(MGSLPC_INFO *info)
3753 {
3754         static unsigned char patterns[] =
3755             { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f };
3756         static unsigned int count = ARRAY_SIZE(patterns);
3757         unsigned int i;
3758         bool rc = true;
3759         unsigned long flags;
3760
3761         spin_lock_irqsave(&info->lock, flags);
3762         reset_device(info);
3763
3764         for (i = 0; i < count; i++) {
3765                 write_reg(info, XAD1, patterns[i]);
3766                 write_reg(info, XAD2, patterns[(i + 1) % count]);
3767                 if ((read_reg(info, XAD1) != patterns[i]) ||
3768                     (read_reg(info, XAD2) != patterns[(i + 1) % count])) {
3769                         rc = false;
3770                         break;
3771                 }
3772         }
3773
3774         spin_unlock_irqrestore(&info->lock, flags);
3775         return rc;
3776 }
3777
3778 static bool irq_test(MGSLPC_INFO *info)
3779 {
3780         unsigned long end_time;
3781         unsigned long flags;
3782
3783         spin_lock_irqsave(&info->lock, flags);
3784         reset_device(info);
3785
3786         info->testing_irq = true;
3787         hdlc_mode(info);
3788
3789         info->irq_occurred = false;
3790
3791         /* init hdlc mode */
3792
3793         irq_enable(info, CHA, IRQ_TIMER);
3794         write_reg(info, CHA + TIMR, 0); /* 512 cycles */
3795         issue_command(info, CHA, CMD_START_TIMER);
3796
3797         spin_unlock_irqrestore(&info->lock, flags);
3798
3799         end_time=100;
3800         while(end_time-- && !info->irq_occurred) {
3801                 msleep_interruptible(10);
3802         }
3803
3804         info->testing_irq = false;
3805
3806         spin_lock_irqsave(&info->lock, flags);
3807         reset_device(info);
3808         spin_unlock_irqrestore(&info->lock, flags);
3809
3810         return info->irq_occurred;
3811 }
3812
3813 static int adapter_test(MGSLPC_INFO *info)
3814 {
3815         if (!register_test(info)) {
3816                 info->init_error = DiagStatus_AddressFailure;
3817                 printk("%s(%d):Register test failure for device %s Addr=%04X\n",
3818                         __FILE__, __LINE__, info->device_name, (unsigned short)(info->io_base));
3819                 return -ENODEV;
3820         }
3821
3822         if (!irq_test(info)) {
3823                 info->init_error = DiagStatus_IrqFailure;
3824                 printk("%s(%d):Interrupt test failure for device %s IRQ=%d\n",
3825                         __FILE__, __LINE__, info->device_name, (unsigned short)(info->irq_level));
3826                 return -ENODEV;
3827         }
3828
3829         if (debug_level >= DEBUG_LEVEL_INFO)
3830                 printk("%s(%d):device %s passed diagnostics\n",
3831                         __FILE__, __LINE__, info->device_name);
3832         return 0;
3833 }
3834
3835 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
3836 {
3837         int i;
3838         int linecount;
3839         if (xmit)
3840                 printk("%s tx data:\n", info->device_name);
3841         else
3842                 printk("%s rx data:\n", info->device_name);
3843
3844         while(count) {
3845                 if (count > 16)
3846                         linecount = 16;
3847                 else
3848                         linecount = count;
3849
3850                 for(i=0;i<linecount;i++)
3851                         printk("%02X ", (unsigned char)data[i]);
3852                 for(;i<17;i++)
3853                         printk("   ");
3854                 for(i=0;i<linecount;i++) {
3855                         if (data[i]>=040 && data[i]<=0176)
3856                                 printk("%c", data[i]);
3857                         else
3858                                 printk(".");
3859                 }
3860                 printk("\n");
3861
3862                 data  += linecount;
3863                 count -= linecount;
3864         }
3865 }
3866
3867 /* HDLC frame time out
3868  * update stats and do tx completion processing
3869  */
3870 static void tx_timeout(unsigned long context)
3871 {
3872         MGSLPC_INFO *info = (MGSLPC_INFO*)context;
3873         unsigned long flags;
3874
3875         if (debug_level >= DEBUG_LEVEL_INFO)
3876                 printk("%s(%d):tx_timeout(%s)\n",
3877                         __FILE__, __LINE__, info->device_name);
3878         if (info->tx_active &&
3879             info->params.mode == MGSL_MODE_HDLC) {
3880                 info->icount.txtimeout++;
3881         }
3882         spin_lock_irqsave(&info->lock, flags);
3883         info->tx_active = false;
3884         info->tx_count = info->tx_put = info->tx_get = 0;
3885
3886         spin_unlock_irqrestore(&info->lock, flags);
3887
3888 #if SYNCLINK_GENERIC_HDLC
3889         if (info->netcount)
3890                 hdlcdev_tx_done(info);
3891         else
3892 #endif
3893         {
3894                 struct tty_struct *tty = tty_port_tty_get(&info->port);
3895                 bh_transmit(info, tty);
3896                 tty_kref_put(tty);
3897         }
3898 }
3899
3900 #if SYNCLINK_GENERIC_HDLC
3901
3902 /**
3903  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
3904  * set encoding and frame check sequence (FCS) options
3905  *
3906  * dev       pointer to network device structure
3907  * encoding  serial encoding setting
3908  * parity    FCS setting
3909  *
3910  * returns 0 if success, otherwise error code
3911  */
3912 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
3913                           unsigned short parity)
3914 {
3915         MGSLPC_INFO *info = dev_to_port(dev);
3916         struct tty_struct *tty;
3917         unsigned char  new_encoding;
3918         unsigned short new_crctype;
3919
3920         /* return error if TTY interface open */
3921         if (info->port.count)
3922                 return -EBUSY;
3923
3924         switch (encoding)
3925         {
3926         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
3927         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
3928         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
3929         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
3930         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
3931         default: return -EINVAL;
3932         }
3933
3934         switch (parity)
3935         {
3936         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
3937         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
3938         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
3939         default: return -EINVAL;
3940         }
3941
3942         info->params.encoding = new_encoding;
3943         info->params.crc_type = new_crctype;
3944
3945         /* if network interface up, reprogram hardware */
3946         if (info->netcount) {
3947                 tty = tty_port_tty_get(&info->port);
3948                 mgslpc_program_hw(info, tty);
3949                 tty_kref_put(tty);
3950         }
3951
3952         return 0;
3953 }
3954
3955 /**
3956  * called by generic HDLC layer to send frame
3957  *
3958  * skb  socket buffer containing HDLC frame
3959  * dev  pointer to network device structure
3960  */
3961 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
3962                                       struct net_device *dev)
3963 {
3964         MGSLPC_INFO *info = dev_to_port(dev);
3965         unsigned long flags;
3966
3967         if (debug_level >= DEBUG_LEVEL_INFO)
3968                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n", __FILE__, dev->name);
3969
3970         /* stop sending until this frame completes */
3971         netif_stop_queue(dev);
3972
3973         /* copy data to device buffers */
3974         skb_copy_from_linear_data(skb, info->tx_buf, skb->len);
3975         info->tx_get = 0;
3976         info->tx_put = info->tx_count = skb->len;
3977
3978         /* update network statistics */
3979         dev->stats.tx_packets++;
3980         dev->stats.tx_bytes += skb->len;
3981
3982         /* done with socket buffer, so free it */
3983         dev_kfree_skb(skb);
3984
3985         /* save start time for transmit timeout detection */
3986         dev->trans_start = jiffies;
3987
3988         /* start hardware transmitter if necessary */
3989         spin_lock_irqsave(&info->lock, flags);
3990         if (!info->tx_active) {
3991                 struct tty_struct *tty = tty_port_tty_get(&info->port);
3992                 tx_start(info, tty);
3993                 tty_kref_put(tty);
3994         }
3995         spin_unlock_irqrestore(&info->lock, flags);
3996
3997         return NETDEV_TX_OK;
3998 }
3999
4000 /**
4001  * called by network layer when interface enabled
4002  * claim resources and initialize hardware
4003  *
4004  * dev  pointer to network device structure
4005  *
4006  * returns 0 if success, otherwise error code
4007  */
4008 static int hdlcdev_open(struct net_device *dev)
4009 {
4010         MGSLPC_INFO *info = dev_to_port(dev);
4011         struct tty_struct *tty;
4012         int rc;
4013         unsigned long flags;
4014
4015         if (debug_level >= DEBUG_LEVEL_INFO)
4016                 printk("%s:hdlcdev_open(%s)\n", __FILE__, dev->name);
4017
4018         /* generic HDLC layer open processing */
4019         rc = hdlc_open(dev);
4020         if (rc != 0)
4021                 return rc;
4022
4023         /* arbitrate between network and tty opens */
4024         spin_lock_irqsave(&info->netlock, flags);
4025         if (info->port.count != 0 || info->netcount != 0) {
4026                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
4027                 spin_unlock_irqrestore(&info->netlock, flags);
4028                 return -EBUSY;
4029         }
4030         info->netcount=1;
4031         spin_unlock_irqrestore(&info->netlock, flags);
4032
4033         tty = tty_port_tty_get(&info->port);
4034         /* claim resources and init adapter */
4035         rc = startup(info, tty);
4036         if (rc != 0) {
4037                 tty_kref_put(tty);
4038                 spin_lock_irqsave(&info->netlock, flags);
4039                 info->netcount=0;
4040                 spin_unlock_irqrestore(&info->netlock, flags);
4041                 return rc;
4042         }
4043         /* assert RTS and DTR, apply hardware settings */
4044         info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
4045         mgslpc_program_hw(info, tty);
4046         tty_kref_put(tty);
4047
4048         /* enable network layer transmit */
4049         dev->trans_start = jiffies;
4050         netif_start_queue(dev);
4051
4052         /* inform generic HDLC layer of current DCD status */
4053         spin_lock_irqsave(&info->lock, flags);
4054         get_signals(info);
4055         spin_unlock_irqrestore(&info->lock, flags);
4056         if (info->serial_signals & SerialSignal_DCD)
4057                 netif_carrier_on(dev);
4058         else
4059                 netif_carrier_off(dev);
4060         return 0;
4061 }
4062
4063 /**
4064  * called by network layer when interface is disabled
4065  * shutdown hardware and release resources
4066  *
4067  * dev  pointer to network device structure
4068  *
4069  * returns 0 if success, otherwise error code
4070  */
4071 static int hdlcdev_close(struct net_device *dev)
4072 {
4073         MGSLPC_INFO *info = dev_to_port(dev);
4074         struct tty_struct *tty = tty_port_tty_get(&info->port);
4075         unsigned long flags;
4076
4077         if (debug_level >= DEBUG_LEVEL_INFO)
4078                 printk("%s:hdlcdev_close(%s)\n", __FILE__, dev->name);
4079
4080         netif_stop_queue(dev);
4081
4082         /* shutdown adapter and release resources */
4083         shutdown(info, tty);
4084         tty_kref_put(tty);
4085         hdlc_close(dev);
4086
4087         spin_lock_irqsave(&info->netlock, flags);
4088         info->netcount=0;
4089         spin_unlock_irqrestore(&info->netlock, flags);
4090
4091         return 0;
4092 }
4093
4094 /**
4095  * called by network layer to process IOCTL call to network device
4096  *
4097  * dev  pointer to network device structure
4098  * ifr  pointer to network interface request structure
4099  * cmd  IOCTL command code
4100  *
4101  * returns 0 if success, otherwise error code
4102  */
4103 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
4104 {
4105         const size_t size = sizeof(sync_serial_settings);
4106         sync_serial_settings new_line;
4107         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
4108         MGSLPC_INFO *info = dev_to_port(dev);
4109         unsigned int flags;
4110
4111         if (debug_level >= DEBUG_LEVEL_INFO)
4112                 printk("%s:hdlcdev_ioctl(%s)\n", __FILE__, dev->name);
4113
4114         /* return error if TTY interface open */
4115         if (info->port.count)
4116                 return -EBUSY;
4117
4118         if (cmd != SIOCWANDEV)
4119                 return hdlc_ioctl(dev, ifr, cmd);
4120
4121         memset(&new_line, 0, size);
4122
4123         switch(ifr->ifr_settings.type) {
4124         case IF_GET_IFACE: /* return current sync_serial_settings */
4125
4126                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
4127                 if (ifr->ifr_settings.size < size) {
4128                         ifr->ifr_settings.size = size; /* data size wanted */
4129                         return -ENOBUFS;
4130                 }
4131
4132                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4133                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4134                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4135                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
4136
4137                 switch (flags){
4138                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
4139                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
4140                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
4141                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
4142                 default: new_line.clock_type = CLOCK_DEFAULT;
4143                 }
4144
4145                 new_line.clock_rate = info->params.clock_speed;
4146                 new_line.loopback   = info->params.loopback ? 1:0;
4147
4148                 if (copy_to_user(line, &new_line, size))
4149                         return -EFAULT;
4150                 return 0;
4151
4152         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
4153
4154                 if(!capable(CAP_NET_ADMIN))
4155                         return -EPERM;
4156                 if (copy_from_user(&new_line, line, size))
4157                         return -EFAULT;
4158
4159                 switch (new_line.clock_type)
4160                 {
4161                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
4162                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
4163                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
4164                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
4165                 case CLOCK_DEFAULT:  flags = info->params.flags &
4166                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4167                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4168                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4169                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
4170                 default: return -EINVAL;
4171                 }
4172
4173                 if (new_line.loopback != 0 && new_line.loopback != 1)
4174                         return -EINVAL;
4175
4176                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4177                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4178                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4179                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
4180                 info->params.flags |= flags;
4181
4182                 info->params.loopback = new_line.loopback;
4183
4184                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
4185                         info->params.clock_speed = new_line.clock_rate;
4186                 else
4187                         info->params.clock_speed = 0;
4188
4189                 /* if network interface up, reprogram hardware */
4190                 if (info->netcount) {
4191                         struct tty_struct *tty = tty_port_tty_get(&info->port);
4192                         mgslpc_program_hw(info, tty);
4193                         tty_kref_put(tty);
4194                 }
4195                 return 0;
4196
4197         default:
4198                 return hdlc_ioctl(dev, ifr, cmd);
4199         }
4200 }
4201
4202 /**
4203  * called by network layer when transmit timeout is detected
4204  *
4205  * dev  pointer to network device structure
4206  */
4207 static void hdlcdev_tx_timeout(struct net_device *dev)
4208 {
4209         MGSLPC_INFO *info = dev_to_port(dev);
4210         unsigned long flags;
4211
4212         if (debug_level >= DEBUG_LEVEL_INFO)
4213                 printk("hdlcdev_tx_timeout(%s)\n", dev->name);
4214
4215         dev->stats.tx_errors++;
4216         dev->stats.tx_aborted_errors++;
4217
4218         spin_lock_irqsave(&info->lock, flags);
4219         tx_stop(info);
4220         spin_unlock_irqrestore(&info->lock, flags);
4221
4222         netif_wake_queue(dev);
4223 }
4224
4225 /**
4226  * called by device driver when transmit completes
4227  * reenable network layer transmit if stopped
4228  *
4229  * info  pointer to device instance information
4230  */
4231 static void hdlcdev_tx_done(MGSLPC_INFO *info)
4232 {
4233         if (netif_queue_stopped(info->netdev))
4234                 netif_wake_queue(info->netdev);
4235 }
4236
4237 /**
4238  * called by device driver when frame received
4239  * pass frame to network layer
4240  *
4241  * info  pointer to device instance information
4242  * buf   pointer to buffer contianing frame data
4243  * size  count of data bytes in buf
4244  */
4245 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size)
4246 {
4247         struct sk_buff *skb = dev_alloc_skb(size);
4248         struct net_device *dev = info->netdev;
4249
4250         if (debug_level >= DEBUG_LEVEL_INFO)
4251                 printk("hdlcdev_rx(%s)\n", dev->name);
4252
4253         if (skb == NULL) {
4254                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
4255                 dev->stats.rx_dropped++;
4256                 return;
4257         }
4258
4259         memcpy(skb_put(skb, size), buf, size);
4260
4261         skb->protocol = hdlc_type_trans(skb, dev);
4262
4263         dev->stats.rx_packets++;
4264         dev->stats.rx_bytes += size;
4265
4266         netif_rx(skb);
4267 }
4268
4269 static const struct net_device_ops hdlcdev_ops = {
4270         .ndo_open       = hdlcdev_open,
4271         .ndo_stop       = hdlcdev_close,
4272         .ndo_change_mtu = hdlc_change_mtu,
4273         .ndo_start_xmit = hdlc_start_xmit,
4274         .ndo_do_ioctl   = hdlcdev_ioctl,
4275         .ndo_tx_timeout = hdlcdev_tx_timeout,
4276 };
4277
4278 /**
4279  * called by device driver when adding device instance
4280  * do generic HDLC initialization
4281  *
4282  * info  pointer to device instance information
4283  *
4284  * returns 0 if success, otherwise error code
4285  */
4286 static int hdlcdev_init(MGSLPC_INFO *info)
4287 {
4288         int rc;
4289         struct net_device *dev;
4290         hdlc_device *hdlc;
4291
4292         /* allocate and initialize network and HDLC layer objects */
4293
4294         dev = alloc_hdlcdev(info);
4295         if (dev == NULL) {
4296                 printk(KERN_ERR "%s:hdlc device allocation failure\n", __FILE__);
4297                 return -ENOMEM;
4298         }
4299
4300         /* for network layer reporting purposes only */
4301         dev->base_addr = info->io_base;
4302         dev->irq       = info->irq_level;
4303
4304         /* network layer callbacks and settings */
4305         dev->netdev_ops     = &hdlcdev_ops;
4306         dev->watchdog_timeo = 10 * HZ;
4307         dev->tx_queue_len   = 50;
4308
4309         /* generic HDLC layer callbacks and settings */
4310         hdlc         = dev_to_hdlc(dev);
4311         hdlc->attach = hdlcdev_attach;
4312         hdlc->xmit   = hdlcdev_xmit;
4313
4314         /* register objects with HDLC layer */
4315         rc = register_hdlc_device(dev);
4316         if (rc) {
4317                 printk(KERN_WARNING "%s:unable to register hdlc device\n", __FILE__);
4318                 free_netdev(dev);
4319                 return rc;
4320         }
4321
4322         info->netdev = dev;
4323         return 0;
4324 }
4325
4326 /**
4327  * called by device driver when removing device instance
4328  * do generic HDLC cleanup
4329  *
4330  * info  pointer to device instance information
4331  */
4332 static void hdlcdev_exit(MGSLPC_INFO *info)
4333 {
4334         unregister_hdlc_device(info->netdev);
4335         free_netdev(info->netdev);
4336         info->netdev = NULL;
4337 }
4338
4339 #endif /* CONFIG_HDLC */
4340