drivers/net/can/sja1000/peak_pci.c

   1 /*
   2  * Copyright (C) 2007, 2011 Wolfgang Grandegger <wg@grandegger.com>
   3  * Copyright (C) 2012 Stephane Grosjean <s.grosjean@peak-system.com>
   4  *
   5  * Derived from the PCAN project file driver/src/pcan_pci.c:
   6  *
   7  * Copyright (C) 2001-2006  PEAK System-Technik GmbH
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the version 2 of the GNU General Public License
  11  * as published by the Free Software Foundation
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/delay.h>
  24 #include <linux/pci.h>
  25 #include <linux/io.h>
  26 #include <linux/i2c.h>
  27 #include <linux/i2c-algo-bit.h>
  28 #include <linux/can.h>
  29 #include <linux/can/dev.h>
  30
  31 #include "sja1000.h"
  32
  33 MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
  34 MODULE_DESCRIPTION("Socket-CAN driver for PEAK PCAN PCI family cards");
  35 MODULE_SUPPORTED_DEVICE("PEAK PCAN PCI/PCIe/PCIeC miniPCI CAN cards");
  36 MODULE_LICENSE("GPL v2");
  37
  38 #define DRV_NAME  "peak_pci"
  39
  40 struct peak_pciec_card;
  41 struct peak_pci_chan {
  42         void __iomem *cfg_base;         /* Common for all channels */
  43         struct net_device *prev_dev;    /* Chain of network devices */
  44         u16 icr_mask;                   /* Interrupt mask for fast ack */
  45         struct peak_pciec_card *pciec_card;     /* only for PCIeC LEDs */
  46 };
  47
  48 #define PEAK_PCI_CAN_CLOCK      (16000000 / 2)
  49
  50 #define PEAK_PCI_CDR            (CDR_CBP | CDR_CLKOUT_MASK)
  51 #define PEAK_PCI_OCR            OCR_TX0_PUSHPULL
  52
  53 /*
  54  * Important PITA registers
  55  */
  56 #define PITA_ICR                0x00    /* Interrupt control register */
  57 #define PITA_GPIOICR            0x18    /* GPIO interface control register */
  58 #define PITA_MISC               0x1C    /* Miscellaneous register */
  59
  60 #define PEAK_PCI_CFG_SIZE       0x1000  /* Size of the config PCI bar */
  61 #define PEAK_PCI_CHAN_SIZE      0x0400  /* Size used by the channel */
  62
  63 #define PEAK_PCI_VENDOR_ID      0x001C  /* The PCI device and vendor IDs */
  64 #define PEAK_PCI_DEVICE_ID      0x0001  /* for PCI/PCIe slot cards */
  65 #define PEAK_PCIEC_DEVICE_ID    0x0002  /* for ExpressCard slot cards */
  66 #define PEAK_PCIE_DEVICE_ID     0x0003  /* for nextgen PCIe slot cards */
  67 #define PEAK_MPCI_DEVICE_ID     0x0008  /* The miniPCI slot cards */
  68
  69 #define PEAK_PCI_CHAN_MAX       4
  70
  71 static const u16 peak_pci_icr_masks[PEAK_PCI_CHAN_MAX] = {
  72         0x02, 0x01, 0x40, 0x80
  73 };
  74
  75 static DEFINE_PCI_DEVICE_TABLE(peak_pci_tbl) = {
  76         {PEAK_PCI_VENDOR_ID, PEAK_PCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
  77         {PEAK_PCI_VENDOR_ID, PEAK_PCIE_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
  78         {PEAK_PCI_VENDOR_ID, PEAK_MPCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
  79 #ifdef CONFIG_CAN_PEAK_PCIEC
  80         {PEAK_PCI_VENDOR_ID, PEAK_PCIEC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
  81 #endif
  82         {0,}
  83 };
  84
  85 MODULE_DEVICE_TABLE(pci, peak_pci_tbl);
  86
  87 #ifdef CONFIG_CAN_PEAK_PCIEC
  88 /*
  89  * PCAN-ExpressCard needs I2C bit-banging configuration option.
  90  */
  91
  92 /* GPIOICR byte access offsets */
  93 #define PITA_GPOUT              0x18    /* GPx output value */
  94 #define PITA_GPIN               0x19    /* GPx input value */
  95 #define PITA_GPOEN              0x1A    /* configure GPx as ouput pin */
  96
  97 /* I2C GP bits */
  98 #define PITA_GPIN_SCL           0x01    /* Serial Clock Line */
  99 #define PITA_GPIN_SDA           0x04    /* Serial DAta line */
 100
 101 #define PCA9553_1_SLAVEADDR     (0xC4 >> 1)
 102
 103 /* PCA9553 LS0 fields values */
 104 enum {
 105         PCA9553_LOW,
 106         PCA9553_HIGHZ,
 107         PCA9553_PWM0,
 108         PCA9553_PWM1
 109 };
 110
 111 /* LEDs control */
 112 #define PCA9553_ON              PCA9553_LOW
 113 #define PCA9553_OFF             PCA9553_HIGHZ
 114 #define PCA9553_SLOW            PCA9553_PWM0
 115 #define PCA9553_FAST            PCA9553_PWM1
 116
 117 #define PCA9553_LED(c)          (1 << (c))
 118 #define PCA9553_LED_STATE(s, c) ((s) << ((c) << 1))
 119
 120 #define PCA9553_LED_ON(c)       PCA9553_LED_STATE(PCA9553_ON, c)
 121 #define PCA9553_LED_OFF(c)      PCA9553_LED_STATE(PCA9553_OFF, c)
 122 #define PCA9553_LED_SLOW(c)     PCA9553_LED_STATE(PCA9553_SLOW, c)
 123 #define PCA9553_LED_FAST(c)     PCA9553_LED_STATE(PCA9553_FAST, c)
 124 #define PCA9553_LED_MASK(c)     PCA9553_LED_STATE(0x03, c)
 125
 126 #define PCA9553_LED_OFF_ALL     (PCA9553_LED_OFF(0) | PCA9553_LED_OFF(1))
 127
 128 #define PCA9553_LS0_INIT        0x40 /* initial value (!= from 0x00) */
 129
 130 struct peak_pciec_chan {
 131         struct net_device *netdev;
 132         unsigned long prev_rx_bytes;
 133         unsigned long prev_tx_bytes;
 134 };
 135
 136 struct peak_pciec_card {
 137         void __iomem *cfg_base;         /* Common for all channels */
 138         void __iomem *reg_base;         /* first channel base address */
 139         u8 led_cache;                   /* leds state cache */
 140
 141         /* PCIExpressCard i2c data */
 142         struct i2c_algo_bit_data i2c_bit;
 143         struct i2c_adapter led_chip;
 144         struct delayed_work led_work;   /* led delayed work */
 145         int chan_count;
 146         struct peak_pciec_chan channel[PEAK_PCI_CHAN_MAX];
 147 };
 148
 149 /* "normal" pci register write callback is overloaded for leds control */
 150 static void peak_pci_write_reg(const struct sja1000_priv *priv,
 151                                int port, u8 val);
 152
 153 static inline void pita_set_scl_highz(struct peak_pciec_card *card)
 154 {
 155         u8 gp_outen = readb(card->cfg_base + PITA_GPOEN) & ~PITA_GPIN_SCL;
 156         writeb(gp_outen, card->cfg_base + PITA_GPOEN);
 157 }
 158
 159 static inline void pita_set_sda_highz(struct peak_pciec_card *card)
 160 {
 161         u8 gp_outen = readb(card->cfg_base + PITA_GPOEN) & ~PITA_GPIN_SDA;
 162         writeb(gp_outen, card->cfg_base + PITA_GPOEN);
 163 }
 164
 165 static void peak_pciec_init_pita_gpio(struct peak_pciec_card *card)
 166 {
 167         /* raise SCL & SDA GPIOs to high-Z */
 168         pita_set_scl_highz(card);
 169         pita_set_sda_highz(card);
 170 }
 171
 172 static void pita_setsda(void *data, int state)
 173 {
 174         struct peak_pciec_card *card = (struct peak_pciec_card *)data;
 175         u8 gp_out, gp_outen;
 176
 177         /* set output sda always to 0 */
 178         gp_out = readb(card->cfg_base + PITA_GPOUT) & ~PITA_GPIN_SDA;
 179         writeb(gp_out, card->cfg_base + PITA_GPOUT);
 180
 181         /* control output sda with GPOEN */
 182         gp_outen = readb(card->cfg_base + PITA_GPOEN);
 183         if (state)
 184                 gp_outen &= ~PITA_GPIN_SDA;
 185         else
 186                 gp_outen |= PITA_GPIN_SDA;
 187
 188         writeb(gp_outen, card->cfg_base + PITA_GPOEN);
 189 }
 190
 191 static void pita_setscl(void *data, int state)
 192 {
 193         struct peak_pciec_card *card = (struct peak_pciec_card *)data;
 194         u8 gp_out, gp_outen;
 195
 196         /* set output scl always to 0 */
 197         gp_out = readb(card->cfg_base + PITA_GPOUT) & ~PITA_GPIN_SCL;
 198         writeb(gp_out, card->cfg_base + PITA_GPOUT);
 199
 200         /* control output scl with GPOEN */
 201         gp_outen = readb(card->cfg_base + PITA_GPOEN);
 202         if (state)
 203                 gp_outen &= ~PITA_GPIN_SCL;
 204         else
 205                 gp_outen |= PITA_GPIN_SCL;
 206
 207         writeb(gp_outen, card->cfg_base + PITA_GPOEN);
 208 }
 209
 210 static int pita_getsda(void *data)
 211 {
 212         struct peak_pciec_card *card = (struct peak_pciec_card *)data;
 213
 214         /* set tristate */
 215         pita_set_sda_highz(card);
 216
 217         return (readb(card->cfg_base + PITA_GPIN) & PITA_GPIN_SDA) ? 1 : 0;
 218 }
 219
 220 static int pita_getscl(void *data)
 221 {
 222         struct peak_pciec_card *card = (struct peak_pciec_card *)data;
 223
 224         /* set tristate */
 225         pita_set_scl_highz(card);
 226
 227         return (readb(card->cfg_base + PITA_GPIN) & PITA_GPIN_SCL) ? 1 : 0;
 228 }
 229
 230 /*
 231  * write commands to the LED chip though the I2C-bus of the PCAN-PCIeC
 232  */
 233 static int peak_pciec_write_pca9553(struct peak_pciec_card *card,
 234                                     u8 offset, u8 data)
 235 {
 236         u8 buffer[2] = {
 237                 offset,
 238                 data
 239         };
 240         struct i2c_msg msg = {
 241                 .addr = PCA9553_1_SLAVEADDR,
 242                 .len = 2,
 243                 .buf = buffer,
 244         };
 245         int ret;
 246
 247         /* cache led mask */
 248         if ((offset == 5) && (data == card->led_cache))
 249                 return 0;
 250
 251         ret = i2c_transfer(&card->led_chip, &msg, 1);
 252         if (ret < 0)
 253                 return ret;
 254
 255         if (offset == 5)
 256                 card->led_cache = data;
 257
 258         return 0;
 259 }
 260
 261 /*
 262  * delayed work callback used to control the LEDs
 263  */
 264 static void peak_pciec_led_work(struct work_struct *work)
 265 {
 266         struct peak_pciec_card *card =
 267                 container_of(work, struct peak_pciec_card, led_work.work);
 268         struct net_device *netdev;
 269         u8 new_led = card->led_cache;
 270         int i, up_count = 0;
 271
 272         /* first check what is to do */
 273         for (i = 0; i < card->chan_count; i++) {
 274                 /* default is: not configured */
 275                 new_led &= ~PCA9553_LED_MASK(i);
 276                 new_led |= PCA9553_LED_ON(i);
 277
 278                 netdev = card->channel[i].netdev;
 279                 if (!netdev || !(netdev->flags & IFF_UP))
 280                         continue;
 281
 282                 up_count++;
 283
 284                 /* no activity (but configured) */
 285                 new_led &= ~PCA9553_LED_MASK(i);
 286                 new_led |= PCA9553_LED_SLOW(i);
 287
 288                 /* if bytes counters changed, set fast blinking led */
 289                 if (netdev->stats.rx_bytes != card->channel[i].prev_rx_bytes) {
 290                         card->channel[i].prev_rx_bytes = netdev->stats.rx_bytes;
 291                         new_led &= ~PCA9553_LED_MASK(i);
 292                         new_led |= PCA9553_LED_FAST(i);
 293                 }
 294                 if (netdev->stats.tx_bytes != card->channel[i].prev_tx_bytes) {
 295                         card->channel[i].prev_tx_bytes = netdev->stats.tx_bytes;
 296                         new_led &= ~PCA9553_LED_MASK(i);
 297                         new_led |= PCA9553_LED_FAST(i);
 298                 }
 299         }
 300
 301         /* check if LS0 settings changed, only update i2c if so */
 302         peak_pciec_write_pca9553(card, 5, new_led);
 303
 304         /* restart timer (except if no more configured channels) */
 305         if (up_count)
 306                 schedule_delayed_work(&card->led_work, HZ);
 307 }
 308
 309 /*
 310  * set LEDs blinking state
 311  */
 312 static void peak_pciec_set_leds(struct peak_pciec_card *card, u8 led_mask, u8 s)
 313 {
 314         u8 new_led = card->led_cache;
 315         int i;
 316
 317         /* first check what is to do */
 318         for (i = 0; i < card->chan_count; i++)
 319                 if (led_mask & PCA9553_LED(i)) {
 320                         new_led &= ~PCA9553_LED_MASK(i);
 321                         new_led |= PCA9553_LED_STATE(s, i);
 322                 }
 323
 324         /* check if LS0 settings changed, only update i2c if so */
 325         peak_pciec_write_pca9553(card, 5, new_led);
 326 }
 327
 328 /*
 329  * start one second delayed work to control LEDs
 330  */
 331 static void peak_pciec_start_led_work(struct peak_pciec_card *card)
 332 {
 333         if (!delayed_work_pending(&card->led_work))
 334                 schedule_delayed_work(&card->led_work, HZ);
 335 }
 336
 337 /*
 338  * stop LEDs delayed work
 339  */
 340 static void peak_pciec_stop_led_work(struct peak_pciec_card *card)
 341 {
 342         cancel_delayed_work_sync(&card->led_work);
 343 }
 344
 345 /*
 346  * initialize the PCA9553 4-bit I2C-bus LED chip
 347  */
 348 static int peak_pciec_init_leds(struct peak_pciec_card *card)
 349 {
 350         int err;
 351
 352         /* prescaler for frequency 0: "SLOW" = 1 Hz = "44" */
 353         err = peak_pciec_write_pca9553(card, 1, 44 / 1);
 354         if (err)
 355                 return err;
 356
 357         /* duty cycle 0: 50% */
 358         err = peak_pciec_write_pca9553(card, 2, 0x80);
 359         if (err)
 360                 return err;
 361
 362         /* prescaler for frequency 1: "FAST" = 5 Hz */
 363         err = peak_pciec_write_pca9553(card, 3, 44 / 5);
 364         if (err)
 365                 return err;
 366
 367         /* duty cycle 1: 50% */
 368         err = peak_pciec_write_pca9553(card, 4, 0x80);
 369         if (err)
 370                 return err;
 371
 372         /* switch LEDs to initial state */
 373         return peak_pciec_write_pca9553(card, 5, PCA9553_LS0_INIT);
 374 }
 375
 376 /*
 377  * restore LEDs state to off peak_pciec_leds_exit
 378  */
 379 static void peak_pciec_leds_exit(struct peak_pciec_card *card)
 380 {
 381         /* switch LEDs to off */
 382         peak_pciec_write_pca9553(card, 5, PCA9553_LED_OFF_ALL);
 383 }
 384
 385 /*
 386  * normal write sja1000 register method overloaded to catch when controller
 387  * is started or stopped, to control leds
 388  */
 389 static void peak_pciec_write_reg(const struct sja1000_priv *priv,
 390                                  int port, u8 val)
 391 {
 392         struct peak_pci_chan *chan = priv->priv;
 393         struct peak_pciec_card *card = chan->pciec_card;
 394         int c = (priv->reg_base - card->reg_base) / PEAK_PCI_CHAN_SIZE;
 395
 396         /* sja1000 register changes control the leds state */
 397         if (port == REG_MOD)
 398                 switch (val) {
 399                 case MOD_RM:
 400                         /* Reset Mode: set led on */
 401                         peak_pciec_set_leds(card, PCA9553_LED(c), PCA9553_ON);
 402                         break;
 403                 case 0x00:
 404                         /* Normal Mode: led slow blinking and start led timer */
 405                         peak_pciec_set_leds(card, PCA9553_LED(c), PCA9553_SLOW);
 406                         peak_pciec_start_led_work(card);
 407                         break;
 408                 default:
 409                         break;
 410                 }
 411
 412         /* call base function */
 413         peak_pci_write_reg(priv, port, val);
 414 }
 415
 416 static struct i2c_algo_bit_data peak_pciec_i2c_bit_ops = {
 417         .setsda = pita_setsda,
 418         .setscl = pita_setscl,
 419         .getsda = pita_getsda,
 420         .getscl = pita_getscl,
 421         .udelay = 10,
 422         .timeout = HZ,
 423 };
 424
 425 static int peak_pciec_probe(struct pci_dev *pdev, struct net_device *dev)
 426 {
 427         struct sja1000_priv *priv = netdev_priv(dev);
 428         struct peak_pci_chan *chan = priv->priv;
 429         struct peak_pciec_card *card;
 430         int err;
 431
 432         /* copy i2c object address from 1st channel */
 433         if (chan->prev_dev) {
 434                 struct sja1000_priv *prev_priv = netdev_priv(chan->prev_dev);
 435                 struct peak_pci_chan *prev_chan = prev_priv->priv;
 436
 437                 card = prev_chan->pciec_card;
 438                 if (!card)
 439                         return -ENODEV;
 440
 441         /* channel is the first one: do the init part */
 442         } else {
 443                 /* create the bit banging I2C adapter structure */
 444                 card = kzalloc(sizeof(struct peak_pciec_card), GFP_KERNEL);
 445                 if (!card) {
 446                         dev_err(&pdev->dev,
 447                                  "failed allocating memory for i2c chip\n");
 448                         return -ENOMEM;
 449                 }
 450
 451                 card->cfg_base = chan->cfg_base;
 452                 card->reg_base = priv->reg_base;
 453
 454                 card->led_chip.owner = THIS_MODULE;
 455                 card->led_chip.dev.parent = &pdev->dev;
 456                 card->led_chip.algo_data = &card->i2c_bit;
 457                 strncpy(card->led_chip.name, "peak_i2c",
 458                         sizeof(card->led_chip.name));
 459
 460                 card->i2c_bit = peak_pciec_i2c_bit_ops;
 461                 card->i2c_bit.udelay = 10;
 462                 card->i2c_bit.timeout = HZ;
 463                 card->i2c_bit.data = card;
 464
 465                 peak_pciec_init_pita_gpio(card);
 466
 467                 err = i2c_bit_add_bus(&card->led_chip);
 468                 if (err) {
 469                         dev_err(&pdev->dev, "i2c init failed\n");
 470                         goto pciec_init_err_1;
 471                 }
 472
 473                 err = peak_pciec_init_leds(card);
 474                 if (err) {
 475                         dev_err(&pdev->dev, "leds hardware init failed\n");
 476                         goto pciec_init_err_2;
 477                 }
 478
 479                 INIT_DELAYED_WORK(&card->led_work, peak_pciec_led_work);
 480                 /* PCAN-ExpressCard needs its own callback for leds */
 481                 priv->write_reg = peak_pciec_write_reg;
 482         }
 483
 484         chan->pciec_card = card;
 485         card->channel[card->chan_count++].netdev = dev;
 486
 487         return 0;
 488
 489 pciec_init_err_2:
 490         i2c_del_adapter(&card->led_chip);
 491
 492 pciec_init_err_1:
 493         peak_pciec_init_pita_gpio(card);
 494         kfree(card);
 495
 496         return err;
 497 }
 498
 499 static void peak_pciec_remove(struct peak_pciec_card *card)
 500 {
 501         peak_pciec_stop_led_work(card);
 502         peak_pciec_leds_exit(card);
 503         i2c_del_adapter(&card->led_chip);
 504         peak_pciec_init_pita_gpio(card);
 505         kfree(card);
 506 }
 507
 508 #else /* CONFIG_CAN_PEAK_PCIEC */
 509
 510 /*
 511  * Placebo functions when PCAN-ExpressCard support is not selected
 512  */
 513 static inline int peak_pciec_probe(struct pci_dev *pdev, struct net_device *dev)
 514 {
 515         return -ENODEV;
 516 }
 517
 518 static inline void peak_pciec_remove(struct peak_pciec_card *card)
 519 {
 520 }
 521 #endif /* CONFIG_CAN_PEAK_PCIEC */
 522
 523 static u8 peak_pci_read_reg(const struct sja1000_priv *priv, int port)
 524 {
 525         return readb(priv->reg_base + (port << 2));
 526 }
 527
 528 static void peak_pci_write_reg(const struct sja1000_priv *priv,
 529                                int port, u8 val)
 530 {
 531         writeb(val, priv->reg_base + (port << 2));
 532 }
 533
 534 static void peak_pci_post_irq(const struct sja1000_priv *priv)
 535 {
 536         struct peak_pci_chan *chan = priv->priv;
 537         u16 icr;
 538
 539         /* Select and clear in PITA stored interrupt */
 540         icr = readw(chan->cfg_base + PITA_ICR);
 541         if (icr & chan->icr_mask)
 542                 writew(chan->icr_mask, chan->cfg_base + PITA_ICR);
 543 }
 544
 545 static int __devinit peak_pci_probe(struct pci_dev *pdev,
 546                                     const struct pci_device_id *ent)
 547 {
 548         struct sja1000_priv *priv;
 549         struct peak_pci_chan *chan;
 550         struct net_device *dev;
 551         void __iomem *cfg_base, *reg_base;
 552         u16 sub_sys_id, icr;
 553         int i, err, channels;
 554
 555         err = pci_enable_device(pdev);
 556         if (err)
 557                 return err;
 558
 559         err = pci_request_regions(pdev, DRV_NAME);
 560         if (err)
 561                 goto failure_disable_pci;
 562
 563         err = pci_read_config_word(pdev, 0x2e, &sub_sys_id);
 564         if (err)
 565                 goto failure_release_regions;
 566
 567         dev_dbg(&pdev->dev, "probing device %04x:%04x:%04x\n",
 568                 pdev->vendor, pdev->device, sub_sys_id);
 569
 570         err = pci_write_config_word(pdev, 0x44, 0);
 571         if (err)
 572                 goto failure_release_regions;
 573
 574         if (sub_sys_id >= 12)
 575                 channels = 4;
 576         else if (sub_sys_id >= 10)
 577                 channels = 3;
 578         else if (sub_sys_id >= 4)
 579                 channels = 2;
 580         else
 581                 channels = 1;
 582
 583         cfg_base = pci_iomap(pdev, 0, PEAK_PCI_CFG_SIZE);
 584         if (!cfg_base) {
 585                 dev_err(&pdev->dev, "failed to map PCI resource #0\n");
 586                 err = -ENOMEM;
 587                 goto failure_release_regions;
 588         }
 589
 590         reg_base = pci_iomap(pdev, 1, PEAK_PCI_CHAN_SIZE * channels);
 591         if (!reg_base) {
 592                 dev_err(&pdev->dev, "failed to map PCI resource #1\n");
 593                 err = -ENOMEM;
 594                 goto failure_unmap_cfg_base;
 595         }
 596
 597         /* Set GPIO control register */
 598         writew(0x0005, cfg_base + PITA_GPIOICR + 2);
 599         /* Enable all channels of this card */
 600         writeb(0x00, cfg_base + PITA_GPIOICR);
 601         /* Toggle reset */
 602         writeb(0x05, cfg_base + PITA_MISC + 3);
 603         mdelay(5);
 604         /* Leave parport mux mode */
 605         writeb(0x04, cfg_base + PITA_MISC + 3);
 606
 607         icr = readw(cfg_base + PITA_ICR + 2);
 608
 609         for (i = 0; i < channels; i++) {
 610                 dev = alloc_sja1000dev(sizeof(struct peak_pci_chan));
 611                 if (!dev) {
 612                         err = -ENOMEM;
 613                         goto failure_remove_channels;
 614                 }
 615
 616                 priv = netdev_priv(dev);
 617                 chan = priv->priv;
 618
 619                 chan->cfg_base = cfg_base;
 620                 priv->reg_base = reg_base + i * PEAK_PCI_CHAN_SIZE;
 621
 622                 priv->read_reg = peak_pci_read_reg;
 623                 priv->write_reg = peak_pci_write_reg;
 624                 priv->post_irq = peak_pci_post_irq;
 625
 626                 priv->can.clock.freq = PEAK_PCI_CAN_CLOCK;
 627                 priv->ocr = PEAK_PCI_OCR;
 628                 priv->cdr = PEAK_PCI_CDR;
 629                 /* Neither a slave nor a single device distributes the clock */
 630                 if (channels == 1 || i > 0)
 631                         priv->cdr |= CDR_CLK_OFF;
 632
 633                 /* Setup interrupt handling */
 634                 priv->irq_flags = IRQF_SHARED;
 635                 dev->irq = pdev->irq;
 636
 637                 chan->icr_mask = peak_pci_icr_masks[i];
 638                 icr |= chan->icr_mask;
 639
 640                 SET_NETDEV_DEV(dev, &pdev->dev);
 641
 642                 /* Create chain of SJA1000 devices */
 643                 chan->prev_dev = pci_get_drvdata(pdev);
 644                 pci_set_drvdata(pdev, dev);
 645
 646                 /*
 647                  * PCAN-ExpressCard needs some additional i2c init.
 648                  * This must be done *before* register_sja1000dev() but
 649                  * *after* devices linkage
 650                  */
 651                 if (pdev->device == PEAK_PCIEC_DEVICE_ID) {
 652                         err = peak_pciec_probe(pdev, dev);
 653                         if (err) {
 654                                 dev_err(&pdev->dev,
 655                                         "failed to probe device (err %d)\n",
 656                                         err);
 657                                 goto failure_free_dev;
 658                         }
 659                 }
 660
 661                 err = register_sja1000dev(dev);
 662                 if (err) {
 663                         dev_err(&pdev->dev, "failed to register device\n");
 664                         goto failure_free_dev;
 665                 }
 666
 667                 dev_info(&pdev->dev,
 668                          "%s at reg_base=0x%p cfg_base=0x%p irq=%d\n",
 669                          dev->name, priv->reg_base, chan->cfg_base, dev->irq);
 670         }
 671
 672         /* Enable interrupts */
 673         writew(icr, cfg_base + PITA_ICR + 2);
 674
 675         return 0;
 676
 677 failure_free_dev:
 678         pci_set_drvdata(pdev, chan->prev_dev);
 679         free_sja1000dev(dev);
 680
 681 failure_remove_channels:
 682         /* Disable interrupts */
 683         writew(0x0, cfg_base + PITA_ICR + 2);
 684
 685         chan = NULL;
 686         for (dev = pci_get_drvdata(pdev); dev; dev = chan->prev_dev) {
 687                 unregister_sja1000dev(dev);
 688                 free_sja1000dev(dev);
 689                 priv = netdev_priv(dev);
 690                 chan = priv->priv;
 691         }
 692
 693         /* free any PCIeC resources too */
 694         if (chan && chan->pciec_card)
 695                 peak_pciec_remove(chan->pciec_card);
 696
 697         pci_iounmap(pdev, reg_base);
 698
 699 failure_unmap_cfg_base:
 700         pci_iounmap(pdev, cfg_base);
 701
 702 failure_release_regions:
 703         pci_release_regions(pdev);
 704
 705 failure_disable_pci:
 706         pci_disable_device(pdev);
 707
 708         return err;
 709 }
 710
 711 static void __devexit peak_pci_remove(struct pci_dev *pdev)
 712 {
 713         struct net_device *dev = pci_get_drvdata(pdev); /* Last device */
 714         struct sja1000_priv *priv = netdev_priv(dev);
 715         struct peak_pci_chan *chan = priv->priv;
 716         void __iomem *cfg_base = chan->cfg_base;
 717         void __iomem *reg_base = priv->reg_base;
 718
 719         /* Disable interrupts */
 720         writew(0x0, cfg_base + PITA_ICR + 2);
 721
 722         /* Loop over all registered devices */
 723         while (1) {
 724                 dev_info(&pdev->dev, "removing device %s\n", dev->name);
 725                 unregister_sja1000dev(dev);
 726                 free_sja1000dev(dev);
 727                 dev = chan->prev_dev;
 728
 729                 if (!dev) {
 730                         /* do that only for first channel */
 731                         if (chan->pciec_card)
 732                                 peak_pciec_remove(chan->pciec_card);
 733                         break;
 734                 }
 735                 priv = netdev_priv(dev);
 736                 chan = priv->priv;
 737         }
 738
 739         pci_iounmap(pdev, reg_base);
 740         pci_iounmap(pdev, cfg_base);
 741         pci_release_regions(pdev);
 742         pci_disable_device(pdev);
 743
 744         pci_set_drvdata(pdev, NULL);
 745 }
 746
 747 static struct pci_driver peak_pci_driver = {
 748         .name = DRV_NAME,
 749         .id_table = peak_pci_tbl,
 750         .probe = peak_pci_probe,
 751         .remove = __devexit_p(peak_pci_remove),
 752 };
 753
 754 module_pci_driver(peak_pci_driver);