kernel/drivers/net/irda/sh_irda.c

   1 /*
   2  * SuperH IrDA Driver
   3  *
   4  * Copyright (C) 2010 Renesas Solutions Corp.
   5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   6  *
   7  * Based on sh_sir.c
   8  * Copyright (C) 2009 Renesas Solutions Corp.
   9  * Copyright 2006-2009 Analog Devices Inc.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 /*
  17  * CAUTION
  18  *
  19  * This driver is very simple.
  20  * So, it doesn't have below support now
  21  *  - MIR/FIR support
  22  *  - DMA transfer support
  23  *  - FIFO mode support
  24  */
  25 #include <linux/io.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/module.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/pm_runtime.h>
  30 #include <linux/clk.h>
  31 #include <net/irda/wrapper.h>
  32 #include <net/irda/irda_device.h>
  33
  34 #define DRIVER_NAME "sh_irda"
  35
  36 #define __IRDARAM_LEN   0x1039
  37
  38 #define IRTMR           0x1F00 /* Transfer mode */
  39 #define IRCFR           0x1F02 /* Configuration */
  40 #define IRCTR           0x1F04 /* IR control */
  41 #define IRTFLR          0x1F20 /* Transmit frame length */
  42 #define IRTCTR          0x1F22 /* Transmit control */
  43 #define IRRFLR          0x1F40 /* Receive frame length */
  44 #define IRRCTR          0x1F42 /* Receive control */
  45 #define SIRISR          0x1F60 /* SIR-UART mode interrupt source */
  46 #define SIRIMR          0x1F62 /* SIR-UART mode interrupt mask */
  47 #define SIRICR          0x1F64 /* SIR-UART mode interrupt clear */
  48 #define SIRBCR          0x1F68 /* SIR-UART mode baud rate count */
  49 #define MFIRISR         0x1F70 /* MIR/FIR mode interrupt source */
  50 #define MFIRIMR         0x1F72 /* MIR/FIR mode interrupt mask */
  51 #define MFIRICR         0x1F74 /* MIR/FIR mode interrupt clear */
  52 #define CRCCTR          0x1F80 /* CRC engine control */
  53 #define CRCIR           0x1F86 /* CRC engine input data */
  54 #define CRCCR           0x1F8A /* CRC engine calculation */
  55 #define CRCOR           0x1F8E /* CRC engine output data */
  56 #define FIFOCP          0x1FC0 /* FIFO current pointer */
  57 #define FIFOFP          0x1FC2 /* FIFO follow pointer */
  58 #define FIFORSMSK       0x1FC4 /* FIFO receive status mask */
  59 #define FIFORSOR        0x1FC6 /* FIFO receive status OR */
  60 #define FIFOSEL         0x1FC8 /* FIFO select */
  61 #define FIFORS          0x1FCA /* FIFO receive status */
  62 #define FIFORFL         0x1FCC /* FIFO receive frame length */
  63 #define FIFORAMCP       0x1FCE /* FIFO RAM current pointer */
  64 #define FIFORAMFP       0x1FD0 /* FIFO RAM follow pointer */
  65 #define BIFCTL          0x1FD2 /* BUS interface control */
  66 #define IRDARAM         0x0000 /* IrDA buffer RAM */
  67 #define IRDARAM_LEN     __IRDARAM_LEN /* - 8/16/32 (read-only for 32) */
  68
  69 /* IRTMR */
  70 #define TMD_MASK        (0x3 << 14) /* Transfer Mode */
  71 #define TMD_SIR         (0x0 << 14)
  72 #define TMD_MIR         (0x3 << 14)
  73 #define TMD_FIR         (0x2 << 14)
  74
  75 #define FIFORIM         (1 << 8) /* FIFO receive interrupt mask */
  76 #define MIM             (1 << 4) /* MIR/FIR Interrupt Mask */
  77 #define SIM             (1 << 0) /* SIR Interrupt Mask */
  78 #define xIM_MASK        (FIFORIM | MIM | SIM)
  79
  80 /* IRCFR */
  81 #define RTO_SHIFT       8 /* shift for Receive Timeout */
  82 #define RTO             (0x3 << RTO_SHIFT)
  83
  84 /* IRTCTR */
  85 #define ARMOD           (1 << 15) /* Auto-Receive Mode */
  86 #define TE              (1 <<  0) /* Transmit Enable */
  87
  88 /* IRRFLR */
  89 #define RFL_MASK        (0x1FFF) /* mask for Receive Frame Length */
  90
  91 /* IRRCTR */
  92 #define RE              (1 <<  0) /* Receive Enable */
  93
  94 /*
  95  * SIRISR,  SIRIMR,  SIRICR,
  96  * MFIRISR, MFIRIMR, MFIRICR
  97  */
  98 #define FRE             (1 << 15) /* Frame Receive End */
  99 #define TROV            (1 << 11) /* Transfer Area Overflow */
 100 #define xIR_9           (1 << 9)
 101 #define TOT             xIR_9     /* for SIR     Timeout */
 102 #define ABTD            xIR_9     /* for MIR/FIR Abort Detection */
 103 #define xIR_8           (1 << 8)
 104 #define FER             xIR_8     /* for SIR     Framing Error */
 105 #define CRCER           xIR_8     /* for MIR/FIR CRC error */
 106 #define FTE             (1 << 7)  /* Frame Transmit End */
 107 #define xIR_MASK        (FRE | TROV | xIR_9 | xIR_8 | FTE)
 108
 109 /* SIRBCR */
 110 #define BRC_MASK        (0x3F) /* mask for Baud Rate Count */
 111
 112 /* CRCCTR */
 113 #define CRC_RST         (1 << 15) /* CRC Engine Reset */
 114 #define CRC_CT_MASK     0x0FFF    /* mask for CRC Engine Input Data Count */
 115
 116 /* CRCIR */
 117 #define CRC_IN_MASK     0x0FFF    /* mask for CRC Engine Input Data */
 118
 119 /************************************************************************
 120
 121
 122                         enum / structure
 123
 124
 125 ************************************************************************/
 126 enum sh_irda_mode {
 127         SH_IRDA_NONE = 0,
 128         SH_IRDA_SIR,
 129         SH_IRDA_MIR,
 130         SH_IRDA_FIR,
 131 };
 132
 133 struct sh_irda_self;
 134 struct sh_irda_xir_func {
 135         int (*xir_fre)  (struct sh_irda_self *self);
 136         int (*xir_trov) (struct sh_irda_self *self);
 137         int (*xir_9)    (struct sh_irda_self *self);
 138         int (*xir_8)    (struct sh_irda_self *self);
 139         int (*xir_fte)  (struct sh_irda_self *self);
 140 };
 141
 142 struct sh_irda_self {
 143         void __iomem            *membase;
 144         unsigned int            irq;
 145         struct platform_device  *pdev;
 146
 147         struct net_device       *ndev;
 148
 149         struct irlap_cb         *irlap;
 150         struct qos_info         qos;
 151
 152         iobuff_t                tx_buff;
 153         iobuff_t                rx_buff;
 154
 155         enum sh_irda_mode       mode;
 156         spinlock_t              lock;
 157
 158         struct sh_irda_xir_func *xir_func;
 159 };
 160
 161 /************************************************************************
 162
 163
 164                         common function
 165
 166
 167 ************************************************************************/
 168 static void sh_irda_write(struct sh_irda_self *self, u32 offset, u16 data)
 169 {
 170         unsigned long flags;
 171
 172         spin_lock_irqsave(&self->lock, flags);
 173         iowrite16(data, self->membase + offset);
 174         spin_unlock_irqrestore(&self->lock, flags);
 175 }
 176
 177 static u16 sh_irda_read(struct sh_irda_self *self, u32 offset)
 178 {
 179         unsigned long flags;
 180         u16 ret;
 181
 182         spin_lock_irqsave(&self->lock, flags);
 183         ret = ioread16(self->membase + offset);
 184         spin_unlock_irqrestore(&self->lock, flags);
 185
 186         return ret;
 187 }
 188
 189 static void sh_irda_update_bits(struct sh_irda_self *self, u32 offset,
 190                                u16 mask, u16 data)
 191 {
 192         unsigned long flags;
 193         u16 old, new;
 194
 195         spin_lock_irqsave(&self->lock, flags);
 196         old = ioread16(self->membase + offset);
 197         new = (old & ~mask) | data;
 198         if (old != new)
 199                 iowrite16(data, self->membase + offset);
 200         spin_unlock_irqrestore(&self->lock, flags);
 201 }
 202
 203 /************************************************************************
 204
 205
 206                         mode function
 207
 208
 209 ************************************************************************/
 210 /*=====================================
 211  *
 212  *              common
 213  *
 214  *=====================================*/
 215 static void sh_irda_rcv_ctrl(struct sh_irda_self *self, int enable)
 216 {
 217         struct device *dev = &self->ndev->dev;
 218
 219         sh_irda_update_bits(self, IRRCTR, RE, enable ? RE : 0);
 220         dev_dbg(dev, "recv %s\n", enable ? "enable" : "disable");
 221 }
 222
 223 static int sh_irda_set_timeout(struct sh_irda_self *self, int interval)
 224 {
 225         struct device *dev = &self->ndev->dev;
 226
 227         if (SH_IRDA_SIR != self->mode)
 228                 interval = 0;
 229
 230         if (interval < 0 || interval > 2) {
 231                 dev_err(dev, "unsupported timeout interval\n");
 232                 return -EINVAL;
 233         }
 234
 235         sh_irda_update_bits(self, IRCFR, RTO, interval << RTO_SHIFT);
 236         return 0;
 237 }
 238
 239 static int sh_irda_set_baudrate(struct sh_irda_self *self, int baudrate)
 240 {
 241         struct device *dev = &self->ndev->dev;
 242         u16 val;
 243
 244         if (baudrate < 0)
 245                 return 0;
 246
 247         if (SH_IRDA_SIR != self->mode) {
 248                 dev_err(dev, "it is not SIR mode\n");
 249                 return -EINVAL;
 250         }
 251
 252         /*
 253          * Baud rate (bits/s) =
 254          *   (48 MHz / 26) / (baud rate counter value + 1) x 16
 255          */
 256         val = (48000000 / 26 / 16 / baudrate) - 1;
 257         dev_dbg(dev, "baudrate = %d,  val = 0x%02x\n", baudrate, val);
 258
 259         sh_irda_update_bits(self, SIRBCR, BRC_MASK, val);
 260
 261         return 0;
 262 }
 263
 264 static int sh_irda_get_rcv_length(struct sh_irda_self *self)
 265 {
 266         return RFL_MASK & sh_irda_read(self, IRRFLR);
 267 }
 268
 269 /*=====================================
 270  *
 271  *              NONE MODE
 272  *
 273  *=====================================*/
 274 static int sh_irda_xir_fre(struct sh_irda_self *self)
 275 {
 276         struct device *dev = &self->ndev->dev;
 277         dev_err(dev, "none mode: frame recv\n");
 278         return 0;
 279 }
 280
 281 static int sh_irda_xir_trov(struct sh_irda_self *self)
 282 {
 283         struct device *dev = &self->ndev->dev;
 284         dev_err(dev, "none mode: buffer ram over\n");
 285         return 0;
 286 }
 287
 288 static int sh_irda_xir_9(struct sh_irda_self *self)
 289 {
 290         struct device *dev = &self->ndev->dev;
 291         dev_err(dev, "none mode: time over\n");
 292         return 0;
 293 }
 294
 295 static int sh_irda_xir_8(struct sh_irda_self *self)
 296 {
 297         struct device *dev = &self->ndev->dev;
 298         dev_err(dev, "none mode: framing error\n");
 299         return 0;
 300 }
 301
 302 static int sh_irda_xir_fte(struct sh_irda_self *self)
 303 {
 304         struct device *dev = &self->ndev->dev;
 305         dev_err(dev, "none mode: frame transmit end\n");
 306         return 0;
 307 }
 308
 309 static struct sh_irda_xir_func sh_irda_xir_func = {
 310         .xir_fre        = sh_irda_xir_fre,
 311         .xir_trov       = sh_irda_xir_trov,
 312         .xir_9          = sh_irda_xir_9,
 313         .xir_8          = sh_irda_xir_8,
 314         .xir_fte        = sh_irda_xir_fte,
 315 };
 316
 317 /*=====================================
 318  *
 319  *              MIR/FIR MODE
 320  *
 321  * MIR/FIR are not supported now
 322  *=====================================*/
 323 static struct sh_irda_xir_func sh_irda_mfir_func = {
 324         .xir_fre        = sh_irda_xir_fre,
 325         .xir_trov       = sh_irda_xir_trov,
 326         .xir_9          = sh_irda_xir_9,
 327         .xir_8          = sh_irda_xir_8,
 328         .xir_fte        = sh_irda_xir_fte,
 329 };
 330
 331 /*=====================================
 332  *
 333  *              SIR MODE
 334  *
 335  *=====================================*/
 336 static int sh_irda_sir_fre(struct sh_irda_self *self)
 337 {
 338         struct device *dev = &self->ndev->dev;
 339         u16 data16;
 340         u8  *data = (u8 *)&data16;
 341         int len = sh_irda_get_rcv_length(self);
 342         int i, j;
 343
 344         if (len > IRDARAM_LEN)
 345                 len = IRDARAM_LEN;
 346
 347         dev_dbg(dev, "frame recv length = %d\n", len);
 348
 349         for (i = 0; i < len; i++) {
 350                 j = i % 2;
 351                 if (!j)
 352                         data16 = sh_irda_read(self, IRDARAM + i);
 353
 354                 async_unwrap_char(self->ndev, &self->ndev->stats,
 355                                   &self->rx_buff, data[j]);
 356         }
 357         self->ndev->last_rx = jiffies;
 358
 359         sh_irda_rcv_ctrl(self, 1);
 360
 361         return 0;
 362 }
 363
 364 static int sh_irda_sir_trov(struct sh_irda_self *self)
 365 {
 366         struct device *dev = &self->ndev->dev;
 367
 368         dev_err(dev, "buffer ram over\n");
 369         sh_irda_rcv_ctrl(self, 1);
 370         return 0;
 371 }
 372
 373 static int sh_irda_sir_tot(struct sh_irda_self *self)
 374 {
 375         struct device *dev = &self->ndev->dev;
 376
 377         dev_err(dev, "time over\n");
 378         sh_irda_set_baudrate(self, 9600);
 379         sh_irda_rcv_ctrl(self, 1);
 380         return 0;
 381 }
 382
 383 static int sh_irda_sir_fer(struct sh_irda_self *self)
 384 {
 385         struct device *dev = &self->ndev->dev;
 386
 387         dev_err(dev, "framing error\n");
 388         sh_irda_rcv_ctrl(self, 1);
 389         return 0;
 390 }
 391
 392 static int sh_irda_sir_fte(struct sh_irda_self *self)
 393 {
 394         struct device *dev = &self->ndev->dev;
 395
 396         dev_dbg(dev, "frame transmit end\n");
 397         netif_wake_queue(self->ndev);
 398
 399         return 0;
 400 }
 401
 402 static struct sh_irda_xir_func sh_irda_sir_func = {
 403         .xir_fre        = sh_irda_sir_fre,
 404         .xir_trov       = sh_irda_sir_trov,
 405         .xir_9          = sh_irda_sir_tot,
 406         .xir_8          = sh_irda_sir_fer,
 407         .xir_fte        = sh_irda_sir_fte,
 408 };
 409
 410 static void sh_irda_set_mode(struct sh_irda_self *self, enum sh_irda_mode mode)
 411 {
 412         struct device *dev = &self->ndev->dev;
 413         struct sh_irda_xir_func *func;
 414         const char *name;
 415         u16 data;
 416
 417         switch (mode) {
 418         case SH_IRDA_SIR:
 419                 name    = "SIR";
 420                 data    = TMD_SIR;
 421                 func    = &sh_irda_sir_func;
 422                 break;
 423         case SH_IRDA_MIR:
 424                 name    = "MIR";
 425                 data    = TMD_MIR;
 426                 func    = &sh_irda_mfir_func;
 427                 break;
 428         case SH_IRDA_FIR:
 429                 name    = "FIR";
 430                 data    = TMD_FIR;
 431                 func    = &sh_irda_mfir_func;
 432                 break;
 433         default:
 434                 name    = "NONE";
 435                 data    = 0;
 436                 func    = &sh_irda_xir_func;
 437                 break;
 438         }
 439
 440         self->mode = mode;
 441         self->xir_func = func;
 442         sh_irda_update_bits(self, IRTMR, TMD_MASK, data);
 443
 444         dev_dbg(dev, "switch to %s mode", name);
 445 }
 446
 447 /************************************************************************
 448
 449
 450                         irq function
 451
 452
 453 ************************************************************************/
 454 static void sh_irda_set_irq_mask(struct sh_irda_self *self)
 455 {
 456         u16 tmr_hole;
 457         u16 xir_reg;
 458
 459         /* set all mask */
 460         sh_irda_update_bits(self, IRTMR,   xIM_MASK, xIM_MASK);
 461         sh_irda_update_bits(self, SIRIMR,  xIR_MASK, xIR_MASK);
 462         sh_irda_update_bits(self, MFIRIMR, xIR_MASK, xIR_MASK);
 463
 464         /* clear irq */
 465         sh_irda_update_bits(self, SIRICR,  xIR_MASK, xIR_MASK);
 466         sh_irda_update_bits(self, MFIRICR, xIR_MASK, xIR_MASK);
 467
 468         switch (self->mode) {
 469         case SH_IRDA_SIR:
 470                 tmr_hole        = SIM;
 471                 xir_reg         = SIRIMR;
 472                 break;
 473         case SH_IRDA_MIR:
 474         case SH_IRDA_FIR:
 475                 tmr_hole        = MIM;
 476                 xir_reg         = MFIRIMR;
 477                 break;
 478         default:
 479                 tmr_hole        = 0;
 480                 xir_reg         = 0;
 481                 break;
 482         }
 483
 484         /* open mask */
 485         if (xir_reg) {
 486                 sh_irda_update_bits(self, IRTMR, tmr_hole, 0);
 487                 sh_irda_update_bits(self, xir_reg, xIR_MASK, 0);
 488         }
 489 }
 490
 491 static irqreturn_t sh_irda_irq(int irq, void *dev_id)
 492 {
 493         struct sh_irda_self *self = dev_id;
 494         struct sh_irda_xir_func *func = self->xir_func;
 495         u16 isr = sh_irda_read(self, SIRISR);
 496
 497         /* clear irq */
 498         sh_irda_write(self, SIRICR, isr);
 499
 500         if (isr & FRE)
 501                 func->xir_fre(self);
 502         if (isr & TROV)
 503                 func->xir_trov(self);
 504         if (isr & xIR_9)
 505                 func->xir_9(self);
 506         if (isr & xIR_8)
 507                 func->xir_8(self);
 508         if (isr & FTE)
 509                 func->xir_fte(self);
 510
 511         return IRQ_HANDLED;
 512 }
 513
 514 /************************************************************************
 515
 516
 517                         CRC function
 518
 519
 520 ************************************************************************/
 521 static void sh_irda_crc_reset(struct sh_irda_self *self)
 522 {
 523         sh_irda_write(self, CRCCTR, CRC_RST);
 524 }
 525
 526 static void sh_irda_crc_add(struct sh_irda_self *self, u16 data)
 527 {
 528         sh_irda_write(self, CRCIR, data & CRC_IN_MASK);
 529 }
 530
 531 static u16 sh_irda_crc_cnt(struct sh_irda_self *self)
 532 {
 533         return CRC_CT_MASK & sh_irda_read(self, CRCCTR);
 534 }
 535
 536 static u16 sh_irda_crc_out(struct sh_irda_self *self)
 537 {
 538         return sh_irda_read(self, CRCOR);
 539 }
 540
 541 static int sh_irda_crc_init(struct sh_irda_self *self)
 542 {
 543         struct device *dev = &self->ndev->dev;
 544         int ret = -EIO;
 545         u16 val;
 546
 547         sh_irda_crc_reset(self);
 548
 549         sh_irda_crc_add(self, 0xCC);
 550         sh_irda_crc_add(self, 0xF5);
 551         sh_irda_crc_add(self, 0xF1);
 552         sh_irda_crc_add(self, 0xA7);
 553
 554         val = sh_irda_crc_cnt(self);
 555         if (4 != val) {
 556                 dev_err(dev, "CRC count error %x\n", val);
 557                 goto crc_init_out;
 558         }
 559
 560         val = sh_irda_crc_out(self);
 561         if (0x51DF != val) {
 562                 dev_err(dev, "CRC result error%x\n", val);
 563                 goto crc_init_out;
 564         }
 565
 566         ret = 0;
 567
 568 crc_init_out:
 569
 570         sh_irda_crc_reset(self);
 571         return ret;
 572 }
 573
 574 /************************************************************************
 575
 576
 577                         iobuf function
 578
 579
 580 ************************************************************************/
 581 static void sh_irda_remove_iobuf(struct sh_irda_self *self)
 582 {
 583         kfree(self->rx_buff.head);
 584
 585         self->tx_buff.head = NULL;
 586         self->tx_buff.data = NULL;
 587         self->rx_buff.head = NULL;
 588         self->rx_buff.data = NULL;
 589 }
 590
 591 static int sh_irda_init_iobuf(struct sh_irda_self *self, int rxsize, int txsize)
 592 {
 593         if (self->rx_buff.head ||
 594             self->tx_buff.head) {
 595                 dev_err(&self->ndev->dev, "iobuff has already existed.");
 596                 return -EINVAL;
 597         }
 598
 599         /* rx_buff */
 600         self->rx_buff.head = kmalloc(rxsize, GFP_KERNEL);
 601         if (!self->rx_buff.head)
 602                 return -ENOMEM;
 603
 604         self->rx_buff.truesize  = rxsize;
 605         self->rx_buff.in_frame  = FALSE;
 606         self->rx_buff.state     = OUTSIDE_FRAME;
 607         self->rx_buff.data      = self->rx_buff.head;
 608
 609         /* tx_buff */
 610         self->tx_buff.head      = self->membase + IRDARAM;
 611         self->tx_buff.truesize  = IRDARAM_LEN;
 612
 613         return 0;
 614 }
 615
 616 /************************************************************************
 617
 618
 619                         net_device_ops function
 620
 621
 622 ************************************************************************/
 623 static int sh_irda_hard_xmit(struct sk_buff *skb, struct net_device *ndev)
 624 {
 625         struct sh_irda_self *self = netdev_priv(ndev);
 626         struct device *dev = &self->ndev->dev;
 627         int speed = irda_get_next_speed(skb);
 628         int ret;
 629
 630         dev_dbg(dev, "hard xmit\n");
 631
 632         netif_stop_queue(ndev);
 633         sh_irda_rcv_ctrl(self, 0);
 634
 635         ret = sh_irda_set_baudrate(self, speed);
 636         if (ret < 0)
 637                 goto sh_irda_hard_xmit_end;
 638
 639         self->tx_buff.len = 0;
 640         if (skb->len) {
 641                 unsigned long flags;
 642
 643                 spin_lock_irqsave(&self->lock, flags);
 644                 self->tx_buff.len = async_wrap_skb(skb,
 645                                                    self->tx_buff.head,
 646                                                    self->tx_buff.truesize);
 647                 spin_unlock_irqrestore(&self->lock, flags);
 648
 649                 if (self->tx_buff.len > self->tx_buff.truesize)
 650                         self->tx_buff.len = self->tx_buff.truesize;
 651
 652                 sh_irda_write(self, IRTFLR, self->tx_buff.len);
 653                 sh_irda_write(self, IRTCTR, ARMOD | TE);
 654         } else
 655                 goto sh_irda_hard_xmit_end;
 656
 657         dev_kfree_skb(skb);
 658
 659         return 0;
 660
 661 sh_irda_hard_xmit_end:
 662         sh_irda_set_baudrate(self, 9600);
 663         netif_wake_queue(self->ndev);
 664         sh_irda_rcv_ctrl(self, 1);
 665         dev_kfree_skb(skb);
 666
 667         return ret;
 668
 669 }
 670
 671 static int sh_irda_ioctl(struct net_device *ndev, struct ifreq *ifreq, int cmd)
 672 {
 673         /*
 674          * FIXME
 675          *
 676          * This function is needed for irda framework.
 677          * But nothing to do now
 678          */
 679         return 0;
 680 }
 681
 682 static struct net_device_stats *sh_irda_stats(struct net_device *ndev)
 683 {
 684         struct sh_irda_self *self = netdev_priv(ndev);
 685
 686         return &self->ndev->stats;
 687 }
 688
 689 static int sh_irda_open(struct net_device *ndev)
 690 {
 691         struct sh_irda_self *self = netdev_priv(ndev);
 692         int err;
 693
 694         pm_runtime_get_sync(&self->pdev->dev);
 695         err = sh_irda_crc_init(self);
 696         if (err)
 697                 goto open_err;
 698
 699         sh_irda_set_mode(self, SH_IRDA_SIR);
 700         sh_irda_set_timeout(self, 2);
 701         sh_irda_set_baudrate(self, 9600);
 702
 703         self->irlap = irlap_open(ndev, &self->qos, DRIVER_NAME);
 704         if (!self->irlap) {
 705                 err = -ENODEV;
 706                 goto open_err;
 707         }
 708
 709         netif_start_queue(ndev);
 710         sh_irda_rcv_ctrl(self, 1);
 711         sh_irda_set_irq_mask(self);
 712
 713         dev_info(&ndev->dev, "opened\n");
 714
 715         return 0;
 716
 717 open_err:
 718         pm_runtime_put_sync(&self->pdev->dev);
 719
 720         return err;
 721 }
 722
 723 static int sh_irda_stop(struct net_device *ndev)
 724 {
 725         struct sh_irda_self *self = netdev_priv(ndev);
 726
 727         /* Stop IrLAP */
 728         if (self->irlap) {
 729                 irlap_close(self->irlap);
 730                 self->irlap = NULL;
 731         }
 732
 733         netif_stop_queue(ndev);
 734         pm_runtime_put_sync(&self->pdev->dev);
 735
 736         dev_info(&ndev->dev, "stopped\n");
 737
 738         return 0;
 739 }
 740
 741 static const struct net_device_ops sh_irda_ndo = {
 742         .ndo_open               = sh_irda_open,
 743         .ndo_stop               = sh_irda_stop,
 744         .ndo_start_xmit         = sh_irda_hard_xmit,
 745         .ndo_do_ioctl           = sh_irda_ioctl,
 746         .ndo_get_stats          = sh_irda_stats,
 747 };
 748
 749 /************************************************************************
 750
 751
 752                         platform_driver function
 753
 754
 755 ************************************************************************/
 756 static int sh_irda_probe(struct platform_device *pdev)
 757 {
 758         struct net_device *ndev;
 759         struct sh_irda_self *self;
 760         struct resource *res;
 761         int irq;
 762         int err = -ENOMEM;
 763
 764         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 765         irq = platform_get_irq(pdev, 0);
 766         if (!res || irq < 0) {
 767                 dev_err(&pdev->dev, "Not enough platform resources.\n");
 768                 goto exit;
 769         }
 770
 771         ndev = alloc_irdadev(sizeof(*self));
 772         if (!ndev)
 773                 goto exit;
 774
 775         self = netdev_priv(ndev);
 776         self->membase = ioremap_nocache(res->start, resource_size(res));
 777         if (!self->membase) {
 778                 err = -ENXIO;
 779                 dev_err(&pdev->dev, "Unable to ioremap.\n");
 780                 goto err_mem_1;
 781         }
 782
 783         err = sh_irda_init_iobuf(self, IRDA_SKB_MAX_MTU, IRDA_SIR_MAX_FRAME);
 784         if (err)
 785                 goto err_mem_2;
 786
 787         self->pdev = pdev;
 788         pm_runtime_enable(&pdev->dev);
 789
 790         irda_init_max_qos_capabilies(&self->qos);
 791
 792         ndev->netdev_ops        = &sh_irda_ndo;
 793         ndev->irq               = irq;
 794
 795         self->ndev                      = ndev;
 796         self->qos.baud_rate.bits        &= IR_9600; /* FIXME */
 797         self->qos.min_turn_time.bits    = 1; /* 10 ms or more */
 798         spin_lock_init(&self->lock);
 799
 800         irda_qos_bits_to_value(&self->qos);
 801
 802         err = register_netdev(ndev);
 803         if (err)
 804                 goto err_mem_4;
 805
 806         platform_set_drvdata(pdev, ndev);
 807         err = devm_request_irq(&pdev->dev, irq, sh_irda_irq, 0, "sh_irda", self);
 808         if (err) {
 809                 dev_warn(&pdev->dev, "Unable to attach sh_irda interrupt\n");
 810                 goto err_mem_4;
 811         }
 812
 813         dev_info(&pdev->dev, "SuperH IrDA probed\n");
 814
 815         goto exit;
 816
 817 err_mem_4:
 818         pm_runtime_disable(&pdev->dev);
 819         sh_irda_remove_iobuf(self);
 820 err_mem_2:
 821         iounmap(self->membase);
 822 err_mem_1:
 823         free_netdev(ndev);
 824 exit:
 825         return err;
 826 }
 827
 828 static int sh_irda_remove(struct platform_device *pdev)
 829 {
 830         struct net_device *ndev = platform_get_drvdata(pdev);
 831         struct sh_irda_self *self = netdev_priv(ndev);
 832
 833         if (!self)
 834                 return 0;
 835
 836         unregister_netdev(ndev);
 837         pm_runtime_disable(&pdev->dev);
 838         sh_irda_remove_iobuf(self);
 839         iounmap(self->membase);
 840         free_netdev(ndev);
 841
 842         return 0;
 843 }
 844
 845 static int sh_irda_runtime_nop(struct device *dev)
 846 {
 847         /* Runtime PM callback shared between ->runtime_suspend()
 848          * and ->runtime_resume(). Simply returns success.
 849          *
 850          * This driver re-initializes all registers after
 851          * pm_runtime_get_sync() anyway so there is no need
 852          * to save and restore registers here.
 853          */
 854         return 0;
 855 }
 856
 857 static const struct dev_pm_ops sh_irda_pm_ops = {
 858         .runtime_suspend        = sh_irda_runtime_nop,
 859         .runtime_resume         = sh_irda_runtime_nop,
 860 };
 861
 862 static struct platform_driver sh_irda_driver = {
 863         .probe  = sh_irda_probe,
 864         .remove = sh_irda_remove,
 865         .driver = {
 866                 .name   = DRIVER_NAME,
 867                 .pm     = &sh_irda_pm_ops,
 868         },
 869 };
 870
 871 module_platform_driver(sh_irda_driver);
 872
 873 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
 874 MODULE_DESCRIPTION("SuperH IrDA driver");
 875 MODULE_LICENSE("GPL");