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