drivers/net/can/sja1000/peak_pcmcia.c

   1 /*
   2  * Copyright (C) 2010-2012 Stephane Grosjean <s.grosjean@peak-system.com>
   3  *
   4  * CAN driver for PEAK-System PCAN-PC Card
   5  * Derived from the PCAN project file driver/src/pcan_pccard.c
   6  * Copyright (C) 2006-2010 PEAK System-Technik GmbH
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the version 2 of the GNU General Public License
  10  * as published by the Free Software Foundation
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  */
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/delay.h>
  22 #include <linux/timer.h>
  23 #include <linux/io.h>
  24 #include <pcmcia/cistpl.h>
  25 #include <pcmcia/ds.h>
  26 #include <linux/can.h>
  27 #include <linux/can/dev.h>
  28 #include "sja1000.h"
  29
  30 MODULE_AUTHOR("Stephane Grosjean <s.grosjean@peak-system.com>");
  31 MODULE_DESCRIPTION("CAN driver for PEAK-System PCAN-PC Cards");
  32 MODULE_LICENSE("GPL v2");
  33 MODULE_SUPPORTED_DEVICE("PEAK PCAN-PC Card");
  34
  35 /* PEAK-System PCMCIA driver name */
  36 #define PCC_NAME                "peak_pcmcia"
  37
  38 #define PCC_CHAN_MAX            2
  39
  40 #define PCC_CAN_CLOCK           (16000000 / 2)
  41
  42 #define PCC_MANF_ID             0x0377
  43 #define PCC_CARD_ID             0x0001
  44
  45 #define PCC_CHAN_SIZE           0x20
  46 #define PCC_CHAN_OFF(c)         ((c) * PCC_CHAN_SIZE)
  47 #define PCC_COMN_OFF            (PCC_CHAN_OFF(PCC_CHAN_MAX))
  48 #define PCC_COMN_SIZE           0x40
  49
  50 /* common area registers */
  51 #define PCC_CCR                 0x00
  52 #define PCC_CSR                 0x02
  53 #define PCC_CPR                 0x04
  54 #define PCC_SPI_DIR             0x06
  55 #define PCC_SPI_DOR             0x08
  56 #define PCC_SPI_ADR             0x0a
  57 #define PCC_SPI_IR              0x0c
  58 #define PCC_FW_MAJOR            0x10
  59 #define PCC_FW_MINOR            0x12
  60
  61 /* CCR bits */
  62 #define PCC_CCR_CLK_16          0x00
  63 #define PCC_CCR_CLK_10          0x01
  64 #define PCC_CCR_CLK_21          0x02
  65 #define PCC_CCR_CLK_8           0x03
  66 #define PCC_CCR_CLK_MASK        PCC_CCR_CLK_8
  67
  68 #define PCC_CCR_RST_CHAN(c)     (0x01 << ((c) + 2))
  69 #define PCC_CCR_RST_ALL         (PCC_CCR_RST_CHAN(0) | PCC_CCR_RST_CHAN(1))
  70 #define PCC_CCR_RST_MASK        PCC_CCR_RST_ALL
  71
  72 /* led selection bits */
  73 #define PCC_LED(c)              (1 << (c))
  74 #define PCC_LED_ALL             (PCC_LED(0) | PCC_LED(1))
  75
  76 /* led state value */
  77 #define PCC_LED_ON              0x00
  78 #define PCC_LED_FAST            0x01
  79 #define PCC_LED_SLOW            0x02
  80 #define PCC_LED_OFF             0x03
  81
  82 #define PCC_CCR_LED_CHAN(s, c)  ((s) << (((c) + 2) << 1))
  83
  84 #define PCC_CCR_LED_ON_CHAN(c)          PCC_CCR_LED_CHAN(PCC_LED_ON, c)
  85 #define PCC_CCR_LED_FAST_CHAN(c)        PCC_CCR_LED_CHAN(PCC_LED_FAST, c)
  86 #define PCC_CCR_LED_SLOW_CHAN(c)        PCC_CCR_LED_CHAN(PCC_LED_SLOW, c)
  87 #define PCC_CCR_LED_OFF_CHAN(c)         PCC_CCR_LED_CHAN(PCC_LED_OFF, c)
  88 #define PCC_CCR_LED_MASK_CHAN(c)        PCC_CCR_LED_OFF_CHAN(c)
  89 #define PCC_CCR_LED_OFF_ALL             (PCC_CCR_LED_OFF_CHAN(0) | \
  90                                          PCC_CCR_LED_OFF_CHAN(1))
  91 #define PCC_CCR_LED_MASK                PCC_CCR_LED_OFF_ALL
  92
  93 #define PCC_CCR_INIT    (PCC_CCR_CLK_16 | PCC_CCR_RST_ALL | PCC_CCR_LED_OFF_ALL)
  94
  95 /* CSR bits */
  96 #define PCC_CSR_SPI_BUSY                0x04
  97
  98 /* time waiting for SPI busy (prevent from infinite loop) */
  99 #define PCC_SPI_MAX_BUSY_WAIT_MS        3
 100
 101 /* max count of reading the SPI status register waiting for a change */
 102 /* (prevent from infinite loop) */
 103 #define PCC_WRITE_MAX_LOOP              1000
 104
 105 /* max nb of int handled by that isr in one shot (prevent from infinite loop) */
 106 #define PCC_ISR_MAX_LOOP                10
 107
 108 /* EEPROM chip instruction set */
 109 /* note: EEPROM Read/Write instructions include A8 bit */
 110 #define PCC_EEP_WRITE(a)        (0x02 | (((a) & 0x100) >> 5))
 111 #define PCC_EEP_READ(a)         (0x03 | (((a) & 0x100) >> 5))
 112 #define PCC_EEP_WRDI            0x04    /* EEPROM Write Disable */
 113 #define PCC_EEP_RDSR            0x05    /* EEPROM Read Status Register */
 114 #define PCC_EEP_WREN            0x06    /* EEPROM Write Enable */
 115
 116 /* EEPROM Status Register bits */
 117 #define PCC_EEP_SR_WEN          0x02    /* EEPROM SR Write Enable bit */
 118 #define PCC_EEP_SR_WIP          0x01    /* EEPROM SR Write In Progress bit */
 119
 120 /*
 121  * The board configuration is probably following:
 122  * RX1 is connected to ground.
 123  * TX1 is not connected.
 124  * CLKO is not connected.
 125  * Setting the OCR register to 0xDA is a good idea.
 126  * This means normal output mode, push-pull and the correct polarity.
 127  */
 128 #define PCC_OCR                 (OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL)
 129
 130 /*
 131  * In the CDR register, you should set CBP to 1.
 132  * You will probably also want to set the clock divider value to 7
 133  * (meaning direct oscillator output) because the second SJA1000 chip
 134  * is driven by the first one CLKOUT output.
 135  */
 136 #define PCC_CDR                 (CDR_CBP | CDR_CLKOUT_MASK)
 137
 138 struct pcan_channel {
 139         struct net_device *netdev;
 140         unsigned long prev_rx_bytes;
 141         unsigned long prev_tx_bytes;
 142 };
 143
 144 /* PCAN-PC Card private structure */
 145 struct pcan_pccard {
 146         struct pcmcia_device *pdev;
 147         int chan_count;
 148         struct pcan_channel channel[PCC_CHAN_MAX];
 149         u8 ccr;
 150         u8 fw_major;
 151         u8 fw_minor;
 152         void __iomem *ioport_addr;
 153         struct timer_list led_timer;
 154 };
 155
 156 static struct pcmcia_device_id pcan_table[] = {
 157         PCMCIA_DEVICE_MANF_CARD(PCC_MANF_ID, PCC_CARD_ID),
 158         PCMCIA_DEVICE_NULL,
 159 };
 160
 161 MODULE_DEVICE_TABLE(pcmcia, pcan_table);
 162
 163 static void pcan_set_leds(struct pcan_pccard *card, u8 mask, u8 state);
 164
 165 /*
 166  * start timer which controls leds state
 167  */
 168 static void pcan_start_led_timer(struct pcan_pccard *card)
 169 {
 170         if (!timer_pending(&card->led_timer))
 171                 mod_timer(&card->led_timer, jiffies + HZ);
 172 }
 173
 174 /*
 175  * stop the timer which controls leds state
 176  */
 177 static void pcan_stop_led_timer(struct pcan_pccard *card)
 178 {
 179         del_timer_sync(&card->led_timer);
 180 }
 181
 182 /*
 183  * read a sja1000 register
 184  */
 185 static u8 pcan_read_canreg(const struct sja1000_priv *priv, int port)
 186 {
 187         return ioread8(priv->reg_base + port);
 188 }
 189
 190 /*
 191  * write a sja1000 register
 192  */
 193 static void pcan_write_canreg(const struct sja1000_priv *priv, int port, u8 v)
 194 {
 195         struct pcan_pccard *card = priv->priv;
 196         int c = (priv->reg_base - card->ioport_addr) / PCC_CHAN_SIZE;
 197
 198         /* sja1000 register changes control the leds state */
 199         if (port == SJA1000_MOD)
 200                 switch (v) {
 201                 case MOD_RM:
 202                         /* Reset Mode: set led on */
 203                         pcan_set_leds(card, PCC_LED(c), PCC_LED_ON);
 204                         break;
 205                 case 0x00:
 206                         /* Normal Mode: led slow blinking and start led timer */
 207                         pcan_set_leds(card, PCC_LED(c), PCC_LED_SLOW);
 208                         pcan_start_led_timer(card);
 209                         break;
 210                 default:
 211                         break;
 212                 }
 213
 214         iowrite8(v, priv->reg_base + port);
 215 }
 216
 217 /*
 218  * read a register from the common area
 219  */
 220 static u8 pcan_read_reg(struct pcan_pccard *card, int port)
 221 {
 222         return ioread8(card->ioport_addr + PCC_COMN_OFF + port);
 223 }
 224
 225 /*
 226  * write a register into the common area
 227  */
 228 static void pcan_write_reg(struct pcan_pccard *card, int port, u8 v)
 229 {
 230         /* cache ccr value */
 231         if (port == PCC_CCR) {
 232                 if (card->ccr == v)
 233                         return;
 234                 card->ccr = v;
 235         }
 236
 237         iowrite8(v, card->ioport_addr + PCC_COMN_OFF + port);
 238 }
 239
 240 /*
 241  * check whether the card is present by checking its fw version numbers
 242  * against values read at probing time.
 243  */
 244 static inline int pcan_pccard_present(struct pcan_pccard *card)
 245 {
 246         return ((pcan_read_reg(card, PCC_FW_MAJOR) == card->fw_major) &&
 247                 (pcan_read_reg(card, PCC_FW_MINOR) == card->fw_minor));
 248 }
 249
 250 /*
 251  * wait for SPI engine while it is busy
 252  */
 253 static int pcan_wait_spi_busy(struct pcan_pccard *card)
 254 {
 255         unsigned long timeout = jiffies +
 256                                 msecs_to_jiffies(PCC_SPI_MAX_BUSY_WAIT_MS) + 1;
 257
 258         /* be sure to read status at least once after sleeping */
 259         while (pcan_read_reg(card, PCC_CSR) & PCC_CSR_SPI_BUSY) {
 260                 if (time_after(jiffies, timeout))
 261                         return -EBUSY;
 262                 schedule();
 263         }
 264
 265         return 0;
 266 }
 267
 268 /*
 269  * write data in device eeprom
 270  */
 271 static int pcan_write_eeprom(struct pcan_pccard *card, u16 addr, u8 v)
 272 {
 273         u8 status;
 274         int err, i;
 275
 276         /* write instruction enabling write */
 277         pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_WREN);
 278         err = pcan_wait_spi_busy(card);
 279         if (err)
 280                 goto we_spi_err;
 281
 282         /* wait until write enabled */
 283         for (i = 0; i < PCC_WRITE_MAX_LOOP; i++) {
 284                 /* write instruction reading the status register */
 285                 pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_RDSR);
 286                 err = pcan_wait_spi_busy(card);
 287                 if (err)
 288                         goto we_spi_err;
 289
 290                 /* get status register value and check write enable bit */
 291                 status = pcan_read_reg(card, PCC_SPI_DIR);
 292                 if (status & PCC_EEP_SR_WEN)
 293                         break;
 294         }
 295
 296         if (i >= PCC_WRITE_MAX_LOOP) {
 297                 dev_err(&card->pdev->dev,
 298                         "stop waiting to be allowed to write in eeprom\n");
 299                 return -EIO;
 300         }
 301
 302         /* set address and data */
 303         pcan_write_reg(card, PCC_SPI_ADR, addr & 0xff);
 304         pcan_write_reg(card, PCC_SPI_DOR, v);
 305
 306         /*
 307          * write instruction with bit[3] set according to address value:
 308          * if addr refers to upper half of the memory array: bit[3] = 1
 309          */
 310         pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_WRITE(addr));
 311         err = pcan_wait_spi_busy(card);
 312         if (err)
 313                 goto we_spi_err;
 314
 315         /* wait while write in progress */
 316         for (i = 0; i < PCC_WRITE_MAX_LOOP; i++) {
 317                 /* write instruction reading the status register */
 318                 pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_RDSR);
 319                 err = pcan_wait_spi_busy(card);
 320                 if (err)
 321                         goto we_spi_err;
 322
 323                 /* get status register value and check write in progress bit */
 324                 status = pcan_read_reg(card, PCC_SPI_DIR);
 325                 if (!(status & PCC_EEP_SR_WIP))
 326                         break;
 327         }
 328
 329         if (i >= PCC_WRITE_MAX_LOOP) {
 330                 dev_err(&card->pdev->dev,
 331                         "stop waiting for write in eeprom to complete\n");
 332                 return -EIO;
 333         }
 334
 335         /* write instruction disabling write */
 336         pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_WRDI);
 337         err = pcan_wait_spi_busy(card);
 338         if (err)
 339                 goto we_spi_err;
 340
 341         return 0;
 342
 343 we_spi_err:
 344         dev_err(&card->pdev->dev,
 345                 "stop waiting (spi engine always busy) err %d\n", err);
 346
 347         return err;
 348 }
 349
 350 static void pcan_set_leds(struct pcan_pccard *card, u8 led_mask, u8 state)
 351 {
 352         u8 ccr = card->ccr;
 353         int i;
 354
 355         for (i = 0; i < card->chan_count; i++)
 356                 if (led_mask & PCC_LED(i)) {
 357                         /* clear corresponding led bits in ccr */
 358                         ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
 359                         /* then set new bits */
 360                         ccr |= PCC_CCR_LED_CHAN(state, i);
 361                 }
 362
 363         /* real write only if something has changed in ccr */
 364         pcan_write_reg(card, PCC_CCR, ccr);
 365 }
 366
 367 /*
 368  * enable/disable CAN connectors power
 369  */
 370 static inline void pcan_set_can_power(struct pcan_pccard *card, int onoff)
 371 {
 372         int err;
 373
 374         err = pcan_write_eeprom(card, 0, !!onoff);
 375         if (err)
 376                 dev_err(&card->pdev->dev,
 377                         "failed setting power %s to can connectors (err %d)\n",
 378                         (onoff) ? "on" : "off", err);
 379 }
 380
 381 /*
 382  * set leds state according to channel activity
 383  */
 384 static void pcan_led_timer(unsigned long arg)
 385 {
 386         struct pcan_pccard *card = (struct pcan_pccard *)arg;
 387         struct net_device *netdev;
 388         int i, up_count = 0;
 389         u8 ccr;
 390
 391         ccr = card->ccr;
 392         for (i = 0; i < card->chan_count; i++) {
 393                 /* default is: not configured */
 394                 ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
 395                 ccr |= PCC_CCR_LED_ON_CHAN(i);
 396
 397                 netdev = card->channel[i].netdev;
 398                 if (!netdev || !(netdev->flags & IFF_UP))
 399                         continue;
 400
 401                 up_count++;
 402
 403                 /* no activity (but configured) */
 404                 ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
 405                 ccr |= PCC_CCR_LED_SLOW_CHAN(i);
 406
 407                 /* if bytes counters changed, set fast blinking led */
 408                 if (netdev->stats.rx_bytes != card->channel[i].prev_rx_bytes) {
 409                         card->channel[i].prev_rx_bytes = netdev->stats.rx_bytes;
 410                         ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
 411                         ccr |= PCC_CCR_LED_FAST_CHAN(i);
 412                 }
 413                 if (netdev->stats.tx_bytes != card->channel[i].prev_tx_bytes) {
 414                         card->channel[i].prev_tx_bytes = netdev->stats.tx_bytes;
 415                         ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
 416                         ccr |= PCC_CCR_LED_FAST_CHAN(i);
 417                 }
 418         }
 419
 420         /* write the new leds state */
 421         pcan_write_reg(card, PCC_CCR, ccr);
 422
 423         /* restart timer (except if no more configured channels) */
 424         if (up_count)
 425                 mod_timer(&card->led_timer, jiffies + HZ);
 426 }
 427
 428 /*
 429  * interrupt service routine
 430  */
 431 static irqreturn_t pcan_isr(int irq, void *dev_id)
 432 {
 433         struct pcan_pccard *card = dev_id;
 434         int irq_handled;
 435
 436         /* prevent from infinite loop */
 437         for (irq_handled = 0; irq_handled < PCC_ISR_MAX_LOOP; irq_handled++) {
 438                 /* handle shared interrupt and next loop */
 439                 int nothing_to_handle = 1;
 440                 int i;
 441
 442                 /* check interrupt for each channel */
 443                 for (i = 0; i < card->chan_count; i++) {
 444                         struct net_device *netdev;
 445
 446                         /*
 447                          * check whether the card is present before calling
 448                          * sja1000_interrupt() to speed up hotplug detection
 449                          */
 450                         if (!pcan_pccard_present(card)) {
 451                                 /* card unplugged during isr */
 452                                 return IRQ_NONE;
 453                         }
 454
 455                         /*
 456                          * should check whether all or SJA1000_MAX_IRQ
 457                          * interrupts have been handled: loop again to be sure.
 458                          */
 459                         netdev = card->channel[i].netdev;
 460                         if (netdev &&
 461                             sja1000_interrupt(irq, netdev) == IRQ_HANDLED)
 462                                 nothing_to_handle = 0;
 463                 }
 464
 465                 if (nothing_to_handle)
 466                         break;
 467         }
 468
 469         return (irq_handled) ? IRQ_HANDLED : IRQ_NONE;
 470 }
 471
 472 /*
 473  * free all resources used by the channels and switch off leds and can power
 474  */
 475 static void pcan_free_channels(struct pcan_pccard *card)
 476 {
 477         int i;
 478         u8 led_mask = 0;
 479
 480         for (i = 0; i < card->chan_count; i++) {
 481                 struct net_device *netdev;
 482                 char name[IFNAMSIZ];
 483
 484                 led_mask |= PCC_LED(i);
 485
 486                 netdev = card->channel[i].netdev;
 487                 if (!netdev)
 488                         continue;
 489
 490                 strncpy(name, netdev->name, IFNAMSIZ);
 491
 492                 unregister_sja1000dev(netdev);
 493
 494                 free_sja1000dev(netdev);
 495
 496                 dev_info(&card->pdev->dev, "%s removed\n", name);
 497         }
 498
 499         /* do it only if device not removed */
 500         if (pcan_pccard_present(card)) {
 501                 pcan_set_leds(card, led_mask, PCC_LED_OFF);
 502                 pcan_set_can_power(card, 0);
 503         }
 504 }
 505
 506 /*
 507  * check if a CAN controller is present at the specified location
 508  */
 509 static inline int pcan_channel_present(struct sja1000_priv *priv)
 510 {
 511         /* make sure SJA1000 is in reset mode */
 512         pcan_write_canreg(priv, SJA1000_MOD, 1);
 513         pcan_write_canreg(priv, SJA1000_CDR, CDR_PELICAN);
 514
 515         /* read reset-values */
 516         if (pcan_read_canreg(priv, SJA1000_CDR) == CDR_PELICAN)
 517                 return 1;
 518
 519         return 0;
 520 }
 521
 522 static int pcan_add_channels(struct pcan_pccard *card)
 523 {
 524         struct pcmcia_device *pdev = card->pdev;
 525         int i, err = 0;
 526         u8 ccr = PCC_CCR_INIT;
 527
 528         /* init common registers (reset channels and leds off) */
 529         card->ccr = ~ccr;
 530         pcan_write_reg(card, PCC_CCR, ccr);
 531
 532         /* wait 2ms before unresetting channels */
 533         mdelay(2);
 534
 535         ccr &= ~PCC_CCR_RST_ALL;
 536         pcan_write_reg(card, PCC_CCR, ccr);
 537
 538         /* create one network device per channel detected */
 539         for (i = 0; i < ARRAY_SIZE(card->channel); i++) {
 540                 struct net_device *netdev;
 541                 struct sja1000_priv *priv;
 542
 543                 netdev = alloc_sja1000dev(0);
 544                 if (!netdev) {
 545                         err = -ENOMEM;
 546                         break;
 547                 }
 548
 549                 /* update linkages */
 550                 priv = netdev_priv(netdev);
 551                 priv->priv = card;
 552                 SET_NETDEV_DEV(netdev, &pdev->dev);
 553
 554                 priv->irq_flags = IRQF_SHARED;
 555                 netdev->irq = pdev->irq;
 556                 priv->reg_base = card->ioport_addr + PCC_CHAN_OFF(i);
 557
 558                 /* check if channel is present */
 559                 if (!pcan_channel_present(priv)) {
 560                         dev_err(&pdev->dev, "channel %d not present\n", i);
 561                         free_sja1000dev(netdev);
 562                         continue;
 563                 }
 564
 565                 priv->read_reg  = pcan_read_canreg;
 566                 priv->write_reg = pcan_write_canreg;
 567                 priv->can.clock.freq = PCC_CAN_CLOCK;
 568                 priv->ocr = PCC_OCR;
 569                 priv->cdr = PCC_CDR;
 570
 571                 /* Neither a slave device distributes the clock */
 572                 if (i > 0)
 573                         priv->cdr |= CDR_CLK_OFF;
 574
 575                 priv->flags |= SJA1000_CUSTOM_IRQ_HANDLER;
 576
 577                 /* register SJA1000 device */
 578                 err = register_sja1000dev(netdev);
 579                 if (err) {
 580                         free_sja1000dev(netdev);
 581                         continue;
 582                 }
 583
 584                 card->channel[i].netdev = netdev;
 585                 card->chan_count++;
 586
 587                 /* set corresponding led on in the new ccr */
 588                 ccr &= ~PCC_CCR_LED_OFF_CHAN(i);
 589
 590                 dev_info(&pdev->dev,
 591                         "%s on channel %d at 0x%p irq %d\n",
 592                         netdev->name, i, priv->reg_base, pdev->irq);
 593         }
 594
 595         /* write new ccr (change leds state) */
 596         pcan_write_reg(card, PCC_CCR, ccr);
 597
 598         return err;
 599 }
 600
 601 static int pcan_conf_check(struct pcmcia_device *pdev, void *priv_data)
 602 {
 603         pdev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
 604         pdev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8; /* only */
 605         pdev->io_lines = 10;
 606
 607         /* This reserves IO space but doesn't actually enable it */
 608         return pcmcia_request_io(pdev);
 609 }
 610
 611 /*
 612  * free all resources used by the device
 613  */
 614 static void pcan_free(struct pcmcia_device *pdev)
 615 {
 616         struct pcan_pccard *card = pdev->priv;
 617
 618         if (!card)
 619                 return;
 620
 621         free_irq(pdev->irq, card);
 622         pcan_stop_led_timer(card);
 623
 624         pcan_free_channels(card);
 625
 626         ioport_unmap(card->ioport_addr);
 627
 628         kfree(card);
 629         pdev->priv = NULL;
 630 }
 631
 632 /*
 633  * setup PCMCIA socket and probe for PEAK-System PC-CARD
 634  */
 635 static int pcan_probe(struct pcmcia_device *pdev)
 636 {
 637         struct pcan_pccard *card;
 638         int err;
 639
 640         pdev->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
 641
 642         err = pcmcia_loop_config(pdev, pcan_conf_check, NULL);
 643         if (err) {
 644                 dev_err(&pdev->dev, "pcmcia_loop_config() error %d\n", err);
 645                 goto probe_err_1;
 646         }
 647
 648         if (!pdev->irq) {
 649                 dev_err(&pdev->dev, "no irq assigned\n");
 650                 err = -ENODEV;
 651                 goto probe_err_1;
 652         }
 653
 654         err = pcmcia_enable_device(pdev);
 655         if (err) {
 656                 dev_err(&pdev->dev, "pcmcia_enable_device failed err=%d\n",
 657                         err);
 658                 goto probe_err_1;
 659         }
 660
 661         card = kzalloc(sizeof(struct pcan_pccard), GFP_KERNEL);
 662         if (!card) {
 663                 err = -ENOMEM;
 664                 goto probe_err_2;
 665         }
 666
 667         card->pdev = pdev;
 668         pdev->priv = card;
 669
 670         /* sja1000 api uses iomem */
 671         card->ioport_addr = ioport_map(pdev->resource[0]->start,
 672                                         resource_size(pdev->resource[0]));
 673         if (!card->ioport_addr) {
 674                 dev_err(&pdev->dev, "couldn't map io port into io memory\n");
 675                 err = -ENOMEM;
 676                 goto probe_err_3;
 677         }
 678         card->fw_major = pcan_read_reg(card, PCC_FW_MAJOR);
 679         card->fw_minor = pcan_read_reg(card, PCC_FW_MINOR);
 680
 681         /* display board name and firware version */
 682         dev_info(&pdev->dev, "PEAK-System pcmcia card %s fw %d.%d\n",
 683                 pdev->prod_id[1] ? pdev->prod_id[1] : "PCAN-PC Card",
 684                 card->fw_major, card->fw_minor);
 685
 686         /* detect available channels */
 687         pcan_add_channels(card);
 688         if (!card->chan_count) {
 689                 err = -ENOMEM;
 690                 goto probe_err_4;
 691         }
 692
 693         /* init the timer which controls the leds */
 694         init_timer(&card->led_timer);
 695         card->led_timer.function = pcan_led_timer;
 696         card->led_timer.data = (unsigned long)card;
 697
 698         /* request the given irq */
 699         err = request_irq(pdev->irq, &pcan_isr, IRQF_SHARED, PCC_NAME, card);
 700         if (err) {
 701                 dev_err(&pdev->dev, "couldn't request irq%d\n", pdev->irq);
 702                 goto probe_err_5;
 703         }
 704
 705         /* power on the connectors */
 706         pcan_set_can_power(card, 1);
 707
 708         return 0;
 709
 710 probe_err_5:
 711         /* unregister can devices from network */
 712         pcan_free_channels(card);
 713
 714 probe_err_4:
 715         ioport_unmap(card->ioport_addr);
 716
 717 probe_err_3:
 718         kfree(card);
 719         pdev->priv = NULL;
 720
 721 probe_err_2:
 722         pcmcia_disable_device(pdev);
 723
 724 probe_err_1:
 725         return err;
 726 }
 727
 728 /*
 729  * release claimed resources
 730  */
 731 static void pcan_remove(struct pcmcia_device *pdev)
 732 {
 733         pcan_free(pdev);
 734         pcmcia_disable_device(pdev);
 735 }
 736
 737 static struct pcmcia_driver pcan_driver = {
 738         .name = PCC_NAME,
 739         .probe = pcan_probe,
 740         .remove = pcan_remove,
 741         .id_table = pcan_table,
 742 };
 743 module_pcmcia_driver(pcan_driver);