drivers/net/irda/sh_sir.c

   1 /*
   2  * SuperH IrDA Driver
   3  *
   4  * Copyright (C) 2009 Renesas Solutions Corp.
   5  * Kuninori Morimoto <morimoto.kuninori@renesas.com>
   6  *
   7  * Based on bfin_sir.c
   8  * Copyright 2006-2009 Analog Devices Inc.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/slab.h>
  18 #include <net/irda/wrapper.h>
  19 #include <net/irda/irda_device.h>
  20 #include <asm/clock.h>
  21
  22 #define DRIVER_NAME "sh_sir"
  23
  24 #define RX_PHASE        (1 << 0)
  25 #define TX_PHASE        (1 << 1)
  26 #define TX_COMP_PHASE   (1 << 2) /* tx complete */
  27 #define NONE_PHASE      (1 << 31)
  28
  29 #define IRIF_RINTCLR    0x0016 /* DMA rx interrupt source clear */
  30 #define IRIF_TINTCLR    0x0018 /* DMA tx interrupt source clear */
  31 #define IRIF_SIR0       0x0020 /* IrDA-SIR10 control */
  32 #define IRIF_SIR1       0x0022 /* IrDA-SIR10 baudrate error correction */
  33 #define IRIF_SIR2       0x0024 /* IrDA-SIR10 baudrate count */
  34 #define IRIF_SIR3       0x0026 /* IrDA-SIR10 status */
  35 #define IRIF_SIR_FRM    0x0028 /* Hardware frame processing set */
  36 #define IRIF_SIR_EOF    0x002A /* EOF value */
  37 #define IRIF_SIR_FLG    0x002C /* Flag clear */
  38 #define IRIF_UART_STS2  0x002E /* UART status 2 */
  39 #define IRIF_UART0      0x0030 /* UART control */
  40 #define IRIF_UART1      0x0032 /* UART status */
  41 #define IRIF_UART2      0x0034 /* UART mode */
  42 #define IRIF_UART3      0x0036 /* UART transmit data */
  43 #define IRIF_UART4      0x0038 /* UART receive data */
  44 #define IRIF_UART5      0x003A /* UART interrupt mask */
  45 #define IRIF_UART6      0x003C /* UART baud rate error correction */
  46 #define IRIF_UART7      0x003E /* UART baud rate count set */
  47 #define IRIF_CRC0       0x0040 /* CRC engine control */
  48 #define IRIF_CRC1       0x0042 /* CRC engine input data */
  49 #define IRIF_CRC2       0x0044 /* CRC engine calculation */
  50 #define IRIF_CRC3       0x0046 /* CRC engine output data 1 */
  51 #define IRIF_CRC4       0x0048 /* CRC engine output data 2 */
  52
  53 /* IRIF_SIR0 */
  54 #define IRTPW           (1 << 1) /* transmit pulse width select */
  55 #define IRERRC          (1 << 0) /* Clear receive pulse width error */
  56
  57 /* IRIF_SIR3 */
  58 #define IRERR           (1 << 0) /* received pulse width Error */
  59
  60 /* IRIF_SIR_FRM */
  61 #define EOFD            (1 << 9) /* EOF detection flag */
  62 #define FRER            (1 << 8) /* Frame Error bit */
  63 #define FRP             (1 << 0) /* Frame processing set */
  64
  65 /* IRIF_UART_STS2 */
  66 #define IRSME           (1 << 6) /* Receive Sum     Error flag */
  67 #define IROVE           (1 << 5) /* Receive Overrun Error flag */
  68 #define IRFRE           (1 << 4) /* Receive Framing Error flag */
  69 #define IRPRE           (1 << 3) /* Receive Parity  Error flag */
  70
  71 /* IRIF_UART0_*/
  72 #define TBEC            (1 << 2) /* Transmit Data Clear */
  73 #define RIE             (1 << 1) /* Receive Enable */
  74 #define TIE             (1 << 0) /* Transmit Enable */
  75
  76 /* IRIF_UART1 */
  77 #define URSME           (1 << 6) /* Receive Sum Error Flag */
  78 #define UROVE           (1 << 5) /* Receive Overrun Error Flag */
  79 #define URFRE           (1 << 4) /* Receive Framing Error Flag */
  80 #define URPRE           (1 << 3) /* Receive Parity Error Flag */
  81 #define RBF             (1 << 2) /* Receive Buffer Full Flag */
  82 #define TSBE            (1 << 1) /* Transmit Shift Buffer Empty Flag */
  83 #define TBE             (1 << 0) /* Transmit Buffer Empty flag */
  84 #define TBCOMP          (TSBE | TBE)
  85
  86 /* IRIF_UART5 */
  87 #define RSEIM           (1 << 6) /* Receive Sum Error Flag IRQ Mask */
  88 #define RBFIM           (1 << 2) /* Receive Buffer Full Flag IRQ Mask */
  89 #define TSBEIM          (1 << 1) /* Transmit Shift Buffer Empty Flag IRQ Mask */
  90 #define TBEIM           (1 << 0) /* Transmit Buffer Empty Flag IRQ Mask */
  91 #define RX_MASK         (RSEIM  | RBFIM)
  92
  93 /* IRIF_CRC0 */
  94 #define CRC_RST         (1 << 15) /* CRC Engine Reset */
  95 #define CRC_CT_MASK     0x0FFF
  96
  97 /************************************************************************
  98
  99
 100                         structure
 101
 102
 103 ************************************************************************/
 104 struct sh_sir_self {
 105         void __iomem            *membase;
 106         unsigned int             irq;
 107         struct clk              *clk;
 108
 109         struct net_device       *ndev;
 110
 111         struct irlap_cb         *irlap;
 112         struct qos_info         qos;
 113
 114         iobuff_t                tx_buff;
 115         iobuff_t                rx_buff;
 116 };
 117
 118 /************************************************************************
 119
 120
 121                         common function
 122
 123
 124 ************************************************************************/
 125 static void sh_sir_write(struct sh_sir_self *self, u32 offset, u16 data)
 126 {
 127         iowrite16(data, self->membase + offset);
 128 }
 129
 130 static u16 sh_sir_read(struct sh_sir_self *self, u32 offset)
 131 {
 132         return ioread16(self->membase + offset);
 133 }
 134
 135 static void sh_sir_update_bits(struct sh_sir_self *self, u32 offset,
 136                                u16 mask, u16 data)
 137 {
 138         u16 old, new;
 139
 140         old = sh_sir_read(self, offset);
 141         new = (old & ~mask) | data;
 142         if (old != new)
 143                 sh_sir_write(self, offset, new);
 144 }
 145
 146 /************************************************************************
 147
 148
 149                         CRC function
 150
 151
 152 ************************************************************************/
 153 static void sh_sir_crc_reset(struct sh_sir_self *self)
 154 {
 155         sh_sir_write(self, IRIF_CRC0, CRC_RST);
 156 }
 157
 158 static void sh_sir_crc_add(struct sh_sir_self *self, u8 data)
 159 {
 160         sh_sir_write(self, IRIF_CRC1, (u16)data);
 161 }
 162
 163 static u16 sh_sir_crc_cnt(struct sh_sir_self *self)
 164 {
 165         return CRC_CT_MASK & sh_sir_read(self, IRIF_CRC0);
 166 }
 167
 168 static u16 sh_sir_crc_out(struct sh_sir_self *self)
 169 {
 170         return sh_sir_read(self, IRIF_CRC4);
 171 }
 172
 173 static int sh_sir_crc_init(struct sh_sir_self *self)
 174 {
 175         struct device *dev = &self->ndev->dev;
 176         int ret = -EIO;
 177         u16 val;
 178
 179         sh_sir_crc_reset(self);
 180
 181         sh_sir_crc_add(self, 0xCC);
 182         sh_sir_crc_add(self, 0xF5);
 183         sh_sir_crc_add(self, 0xF1);
 184         sh_sir_crc_add(self, 0xA7);
 185
 186         val = sh_sir_crc_cnt(self);
 187         if (4 != val) {
 188                 dev_err(dev, "CRC count error %x\n", val);
 189                 goto crc_init_out;
 190         }
 191
 192         val = sh_sir_crc_out(self);
 193         if (0x51DF != val) {
 194                 dev_err(dev, "CRC result error%x\n", val);
 195                 goto crc_init_out;
 196         }
 197
 198         ret = 0;
 199
 200 crc_init_out:
 201
 202         sh_sir_crc_reset(self);
 203         return ret;
 204 }
 205
 206 /************************************************************************
 207
 208
 209                         baud rate functions
 210
 211
 212 ************************************************************************/
 213 #define SCLK_BASE 1843200 /* 1.8432MHz */
 214
 215 static u32 sh_sir_find_sclk(struct clk *irda_clk)
 216 {
 217         struct cpufreq_frequency_table *freq_table = irda_clk->freq_table;
 218         struct clk *pclk = clk_get(NULL, "peripheral_clk");
 219         u32 limit, min = 0xffffffff, tmp;
 220         int i, index = 0;
 221
 222         limit = clk_get_rate(pclk);
 223         clk_put(pclk);
 224
 225         /* IrDA can not set over peripheral_clk */
 226         for (i = 0;
 227              freq_table[i].frequency != CPUFREQ_TABLE_END;
 228              i++) {
 229                 u32 freq = freq_table[i].frequency;
 230
 231                 if (freq == CPUFREQ_ENTRY_INVALID)
 232                         continue;
 233
 234                 /* IrDA should not over peripheral_clk */
 235                 if (freq > limit)
 236                         continue;
 237
 238                 tmp = freq % SCLK_BASE;
 239                 if (tmp < min) {
 240                         min = tmp;
 241                         index = i;
 242                 }
 243         }
 244
 245         return freq_table[index].frequency;
 246 }
 247
 248 #define ERR_ROUNDING(a) ((a + 5000) / 10000)
 249 static int sh_sir_set_baudrate(struct sh_sir_self *self, u32 baudrate)
 250 {
 251         struct clk *clk;
 252         struct device *dev = &self->ndev->dev;
 253         u32 rate;
 254         u16 uabca, uabc;
 255         u16 irbca, irbc;
 256         u32 min, rerr, tmp;
 257         int i;
 258
 259         /* Baud Rate Error Correction x 10000 */
 260         u32 rate_err_array[] = {
 261                    0,  625, 1250, 1875,
 262                 2500, 3125, 3750, 4375,
 263                 5000, 5625, 6250, 6875,
 264                 7500, 8125, 8750, 9375,
 265         };
 266
 267         /*
 268          * FIXME
 269          *
 270          * it support 9600 only now
 271          */
 272         switch (baudrate) {
 273         case 9600:
 274                 break;
 275         default:
 276                 dev_err(dev, "un-supported baudrate %d\n", baudrate);
 277                 return -EIO;
 278         }
 279
 280         clk = clk_get(NULL, "irda_clk");
 281         if (!clk) {
 282                 dev_err(dev, "can not get irda_clk\n");
 283                 return -EIO;
 284         }
 285
 286         clk_set_rate(clk, sh_sir_find_sclk(clk));
 287         rate = clk_get_rate(clk);
 288         clk_put(clk);
 289
 290         dev_dbg(dev, "selected sclk = %d\n", rate);
 291
 292         /*
 293          * CALCULATION
 294          *
 295          * 1843200 = system rate / (irbca + (irbc + 1))
 296          */
 297
 298         irbc = rate / SCLK_BASE;
 299
 300         tmp = rate - (SCLK_BASE * irbc);
 301         tmp *= 10000;
 302
 303         rerr = tmp / SCLK_BASE;
 304
 305         min = 0xffffffff;
 306         irbca = 0;
 307         for (i = 0; i < ARRAY_SIZE(rate_err_array); i++) {
 308                 tmp = abs(rate_err_array[i] - rerr);
 309                 if (min > tmp) {
 310                         min = tmp;
 311                         irbca = i;
 312                 }
 313         }
 314
 315         tmp = rate / (irbc + ERR_ROUNDING(rate_err_array[irbca]));
 316         if ((SCLK_BASE / 100) < abs(tmp - SCLK_BASE))
 317                 dev_warn(dev, "IrDA freq error margin over %d\n", tmp);
 318
 319         dev_dbg(dev, "target = %d, result = %d, infrared = %d.%d\n",
 320                SCLK_BASE, tmp, irbc, rate_err_array[irbca]);
 321
 322         irbca = (irbca & 0xF) << 4;
 323         irbc  = (irbc - 1) & 0xF;
 324
 325         if (!irbc) {
 326                 dev_err(dev, "sh_sir can not set 0 in IRIF_SIR2\n");
 327                 return -EIO;
 328         }
 329
 330         sh_sir_write(self, IRIF_SIR0, IRTPW | IRERRC);
 331         sh_sir_write(self, IRIF_SIR1, irbca);
 332         sh_sir_write(self, IRIF_SIR2, irbc);
 333
 334         /*
 335          * CALCULATION
 336          *
 337          * BaudRate[bps] = system rate / (uabca + (uabc + 1) x 16)
 338          */
 339
 340         uabc = rate / baudrate;
 341         uabc = (uabc / 16) - 1;
 342         uabc = (uabc + 1) * 16;
 343
 344         tmp = rate - (uabc * baudrate);
 345         tmp *= 10000;
 346
 347         rerr = tmp / baudrate;
 348
 349         min = 0xffffffff;
 350         uabca = 0;
 351         for (i = 0; i < ARRAY_SIZE(rate_err_array); i++) {
 352                 tmp = abs(rate_err_array[i] - rerr);
 353                 if (min > tmp) {
 354                         min = tmp;
 355                         uabca = i;
 356                 }
 357         }
 358
 359         tmp = rate / (uabc + ERR_ROUNDING(rate_err_array[uabca]));
 360         if ((baudrate / 100) < abs(tmp - baudrate))
 361                 dev_warn(dev, "UART freq error margin over %d\n", tmp);
 362
 363         dev_dbg(dev, "target = %d, result = %d, uart = %d.%d\n",
 364                baudrate, tmp,
 365                uabc, rate_err_array[uabca]);
 366
 367         uabca = (uabca & 0xF) << 4;
 368         uabc  = (uabc / 16) - 1;
 369
 370         sh_sir_write(self, IRIF_UART6, uabca);
 371         sh_sir_write(self, IRIF_UART7, uabc);
 372
 373         return 0;
 374 }
 375
 376 /************************************************************************
 377
 378
 379                         iobuf function
 380
 381
 382 ************************************************************************/
 383 static int __sh_sir_init_iobuf(iobuff_t *io, int size)
 384 {
 385         io->head = kmalloc(size, GFP_KERNEL);
 386         if (!io->head)
 387                 return -ENOMEM;
 388
 389         io->truesize    = size;
 390         io->in_frame    = FALSE;
 391         io->state       = OUTSIDE_FRAME;
 392         io->data        = io->head;
 393
 394         return 0;
 395 }
 396
 397 static void sh_sir_remove_iobuf(struct sh_sir_self *self)
 398 {
 399         kfree(self->rx_buff.head);
 400         kfree(self->tx_buff.head);
 401
 402         self->rx_buff.head = NULL;
 403         self->tx_buff.head = NULL;
 404 }
 405
 406 static int sh_sir_init_iobuf(struct sh_sir_self *self, int rxsize, int txsize)
 407 {
 408         int err = -ENOMEM;
 409
 410         if (self->rx_buff.head ||
 411             self->tx_buff.head) {
 412                 dev_err(&self->ndev->dev, "iobuff has already existed.");
 413                 return err;
 414         }
 415
 416         err = __sh_sir_init_iobuf(&self->rx_buff, rxsize);
 417         if (err)
 418                 goto iobuf_err;
 419
 420         err = __sh_sir_init_iobuf(&self->tx_buff, txsize);
 421
 422 iobuf_err:
 423         if (err)
 424                 sh_sir_remove_iobuf(self);
 425
 426         return err;
 427 }
 428
 429 /************************************************************************
 430
 431
 432                         status function
 433
 434
 435 ************************************************************************/
 436 static void sh_sir_clear_all_err(struct sh_sir_self *self)
 437 {
 438         /* Clear error flag for receive pulse width */
 439         sh_sir_update_bits(self, IRIF_SIR0, IRERRC, IRERRC);
 440
 441         /* Clear frame / EOF error flag */
 442         sh_sir_write(self, IRIF_SIR_FLG, 0xffff);
 443
 444         /* Clear all status error */
 445         sh_sir_write(self, IRIF_UART_STS2, 0);
 446 }
 447
 448 static void sh_sir_set_phase(struct sh_sir_self *self, int phase)
 449 {
 450         u16 uart5 = 0;
 451         u16 uart0 = 0;
 452
 453         switch (phase) {
 454         case TX_PHASE:
 455                 uart5 = TBEIM;
 456                 uart0 = TBEC | TIE;
 457                 break;
 458         case TX_COMP_PHASE:
 459                 uart5 = TSBEIM;
 460                 uart0 = TIE;
 461                 break;
 462         case RX_PHASE:
 463                 uart5 = RX_MASK;
 464                 uart0 = RIE;
 465                 break;
 466         default:
 467                 break;
 468         }
 469
 470         sh_sir_write(self, IRIF_UART5, uart5);
 471         sh_sir_write(self, IRIF_UART0, uart0);
 472 }
 473
 474 static int sh_sir_is_which_phase(struct sh_sir_self *self)
 475 {
 476         u16 val = sh_sir_read(self, IRIF_UART5);
 477
 478         if (val & TBEIM)
 479                 return TX_PHASE;
 480
 481         if (val & TSBEIM)
 482                 return TX_COMP_PHASE;
 483
 484         if (val & RX_MASK)
 485                 return RX_PHASE;
 486
 487         return NONE_PHASE;
 488 }
 489
 490 static void sh_sir_tx(struct sh_sir_self *self, int phase)
 491 {
 492         switch (phase) {
 493         case TX_PHASE:
 494                 if (0 >= self->tx_buff.len) {
 495                         sh_sir_set_phase(self, TX_COMP_PHASE);
 496                 } else {
 497                         sh_sir_write(self, IRIF_UART3, self->tx_buff.data[0]);
 498                         self->tx_buff.len--;
 499                         self->tx_buff.data++;
 500                 }
 501                 break;
 502         case TX_COMP_PHASE:
 503                 sh_sir_set_phase(self, RX_PHASE);
 504                 netif_wake_queue(self->ndev);
 505                 break;
 506         default:
 507                 dev_err(&self->ndev->dev, "should not happen\n");
 508                 break;
 509         }
 510 }
 511
 512 static int sh_sir_read_data(struct sh_sir_self *self)
 513 {
 514         u16 val;
 515         int timeout = 1024;
 516
 517         while (timeout--) {
 518                 val = sh_sir_read(self, IRIF_UART1);
 519
 520                 /* data get */
 521                 if (val & RBF) {
 522                         if (val & (URSME | UROVE | URFRE | URPRE))
 523                                 break;
 524
 525                         return (int)sh_sir_read(self, IRIF_UART4);
 526                 }
 527
 528                 udelay(1);
 529         }
 530
 531         dev_err(&self->ndev->dev, "UART1 %04x : STATUS %04x\n",
 532                 val, sh_sir_read(self, IRIF_UART_STS2));
 533
 534         /* read data register for clear error */
 535         sh_sir_read(self, IRIF_UART4);
 536
 537         return -1;
 538 }
 539
 540 static void sh_sir_rx(struct sh_sir_self *self)
 541 {
 542         int timeout = 1024;
 543         int data;
 544
 545         while (timeout--) {
 546                 data = sh_sir_read_data(self);
 547                 if (data < 0)
 548                         break;
 549
 550                 async_unwrap_char(self->ndev, &self->ndev->stats,
 551                                   &self->rx_buff, (u8)data);
 552                 self->ndev->last_rx = jiffies;
 553
 554                 if (EOFD & sh_sir_read(self, IRIF_SIR_FRM))
 555                         continue;
 556
 557                 break;
 558         }
 559 }
 560
 561 static irqreturn_t sh_sir_irq(int irq, void *dev_id)
 562 {
 563         struct sh_sir_self *self = dev_id;
 564         struct device *dev = &self->ndev->dev;
 565         int phase = sh_sir_is_which_phase(self);
 566
 567         switch (phase) {
 568         case TX_COMP_PHASE:
 569         case TX_PHASE:
 570                 sh_sir_tx(self, phase);
 571                 break;
 572         case RX_PHASE:
 573                 if (sh_sir_read(self, IRIF_SIR3))
 574                         dev_err(dev, "rcv pulse width error occurred\n");
 575
 576                 sh_sir_rx(self);
 577                 sh_sir_clear_all_err(self);
 578                 break;
 579         default:
 580                 dev_err(dev, "unknown interrupt\n");
 581         }
 582
 583          return IRQ_HANDLED;
 584 }
 585
 586 /************************************************************************
 587
 588
 589                         net_device_ops function
 590
 591
 592 ************************************************************************/
 593 static int sh_sir_hard_xmit(struct sk_buff *skb, struct net_device *ndev)
 594 {
 595         struct sh_sir_self *self = netdev_priv(ndev);
 596         int speed = irda_get_next_speed(skb);
 597
 598         if ((0 < speed) &&
 599             (9600 != speed)) {
 600                 dev_err(&ndev->dev, "support 9600 only (%d)\n", speed);
 601                 return -EIO;
 602         }
 603
 604         netif_stop_queue(ndev);
 605
 606         self->tx_buff.data = self->tx_buff.head;
 607         self->tx_buff.len = 0;
 608         if (skb->len)
 609                 self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data,
 610                                                    self->tx_buff.truesize);
 611
 612         sh_sir_set_phase(self, TX_PHASE);
 613         dev_kfree_skb(skb);
 614
 615         return 0;
 616 }
 617
 618 static int sh_sir_ioctl(struct net_device *ndev, struct ifreq *ifreq, int cmd)
 619 {
 620         /*
 621          * FIXME
 622          *
 623          * This function is needed for irda framework.
 624          * But nothing to do now
 625          */
 626         return 0;
 627 }
 628
 629 static struct net_device_stats *sh_sir_stats(struct net_device *ndev)
 630 {
 631         struct sh_sir_self *self = netdev_priv(ndev);
 632
 633         return &self->ndev->stats;
 634 }
 635
 636 static int sh_sir_open(struct net_device *ndev)
 637 {
 638         struct sh_sir_self *self = netdev_priv(ndev);
 639         int err;
 640
 641         clk_enable(self->clk);
 642         err = sh_sir_crc_init(self);
 643         if (err)
 644                 goto open_err;
 645
 646         sh_sir_set_baudrate(self, 9600);
 647
 648         self->irlap = irlap_open(ndev, &self->qos, DRIVER_NAME);
 649         if (!self->irlap) {
 650                 err = -ENODEV;
 651                 goto open_err;
 652         }
 653
 654         /*
 655          * Now enable the interrupt then start the queue
 656          */
 657         sh_sir_update_bits(self, IRIF_SIR_FRM, FRP, FRP);
 658         sh_sir_read(self, IRIF_UART1); /* flag clear */
 659         sh_sir_read(self, IRIF_UART4); /* flag clear */
 660         sh_sir_set_phase(self, RX_PHASE);
 661
 662         netif_start_queue(ndev);
 663
 664         dev_info(&self->ndev->dev, "opened\n");
 665
 666         return 0;
 667
 668 open_err:
 669         clk_disable(self->clk);
 670
 671         return err;
 672 }
 673
 674 static int sh_sir_stop(struct net_device *ndev)
 675 {
 676         struct sh_sir_self *self = netdev_priv(ndev);
 677
 678         /* Stop IrLAP */
 679         if (self->irlap) {
 680                 irlap_close(self->irlap);
 681                 self->irlap = NULL;
 682         }
 683
 684         netif_stop_queue(ndev);
 685
 686         dev_info(&ndev->dev, "stoped\n");
 687
 688         return 0;
 689 }
 690
 691 static const struct net_device_ops sh_sir_ndo = {
 692         .ndo_open               = sh_sir_open,
 693         .ndo_stop               = sh_sir_stop,
 694         .ndo_start_xmit         = sh_sir_hard_xmit,
 695         .ndo_do_ioctl           = sh_sir_ioctl,
 696         .ndo_get_stats          = sh_sir_stats,
 697 };
 698
 699 /************************************************************************
 700
 701
 702                         platform_driver function
 703
 704
 705 ************************************************************************/
 706 static int __devinit sh_sir_probe(struct platform_device *pdev)
 707 {
 708         struct net_device *ndev;
 709         struct sh_sir_self *self;
 710         struct resource *res;
 711         char clk_name[8];
 712         int irq;
 713         int err = -ENOMEM;
 714
 715         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 716         irq = platform_get_irq(pdev, 0);
 717         if (!res || irq < 0) {
 718                 dev_err(&pdev->dev, "Not enough platform resources.\n");
 719                 goto exit;
 720         }
 721
 722         ndev = alloc_irdadev(sizeof(*self));
 723         if (!ndev)
 724                 goto exit;
 725
 726         self = netdev_priv(ndev);
 727         self->membase = ioremap_nocache(res->start, resource_size(res));
 728         if (!self->membase) {
 729                 err = -ENXIO;
 730                 dev_err(&pdev->dev, "Unable to ioremap.\n");
 731                 goto err_mem_1;
 732         }
 733
 734         err = sh_sir_init_iobuf(self, IRDA_SKB_MAX_MTU, IRDA_SIR_MAX_FRAME);
 735         if (err)
 736                 goto err_mem_2;
 737
 738         snprintf(clk_name, sizeof(clk_name), "irda%d", pdev->id);
 739         self->clk = clk_get(&pdev->dev, clk_name);
 740         if (IS_ERR(self->clk)) {
 741                 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
 742                 goto err_mem_3;
 743         }
 744
 745         irda_init_max_qos_capabilies(&self->qos);
 746
 747         ndev->netdev_ops        = &sh_sir_ndo;
 748         ndev->irq               = irq;
 749
 750         self->ndev                      = ndev;
 751         self->qos.baud_rate.bits        &= IR_9600; /* FIXME */
 752         self->qos.min_turn_time.bits    = 1; /* 10 ms or more */
 753
 754         irda_qos_bits_to_value(&self->qos);
 755
 756         err = register_netdev(ndev);
 757         if (err)
 758                 goto err_mem_4;
 759
 760         platform_set_drvdata(pdev, ndev);
 761
 762         if (request_irq(irq, sh_sir_irq, IRQF_DISABLED, "sh_sir", self)) {
 763                 dev_warn(&pdev->dev, "Unable to attach sh_sir interrupt\n");
 764                 goto err_mem_4;
 765         }
 766
 767         dev_info(&pdev->dev, "SuperH IrDA probed\n");
 768
 769         goto exit;
 770
 771 err_mem_4:
 772         clk_put(self->clk);
 773 err_mem_3:
 774         sh_sir_remove_iobuf(self);
 775 err_mem_2:
 776         iounmap(self->membase);
 777 err_mem_1:
 778         free_netdev(ndev);
 779 exit:
 780         return err;
 781 }
 782
 783 static int __devexit sh_sir_remove(struct platform_device *pdev)
 784 {
 785         struct net_device *ndev = platform_get_drvdata(pdev);
 786         struct sh_sir_self *self = netdev_priv(ndev);
 787
 788         if (!self)
 789                 return 0;
 790
 791         unregister_netdev(ndev);
 792         clk_put(self->clk);
 793         sh_sir_remove_iobuf(self);
 794         iounmap(self->membase);
 795         free_netdev(ndev);
 796         platform_set_drvdata(pdev, NULL);
 797
 798         return 0;
 799 }
 800
 801 static struct platform_driver sh_sir_driver = {
 802         .probe   = sh_sir_probe,
 803         .remove  = __devexit_p(sh_sir_remove),
 804         .driver  = {
 805                 .name = DRIVER_NAME,
 806         },
 807 };
 808
 809 static int __init sh_sir_init(void)
 810 {
 811         return platform_driver_register(&sh_sir_driver);
 812 }
 813
 814 static void __exit sh_sir_exit(void)
 815 {
 816         platform_driver_unregister(&sh_sir_driver);
 817 }
 818
 819 module_init(sh_sir_init);
 820 module_exit(sh_sir_exit);
 821
 822 MODULE_AUTHOR("Kuninori Morimoto <morimoto.kuninori@renesas.com>");
 823 MODULE_DESCRIPTION("SuperH IrDA driver");
 824 MODULE_LICENSE("GPL");