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("Stephane Grosjean <s.grosjean@peak-system.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_SUPPORTED_DEVICE("PEAK PCAN miniPCIe/cPCI PC/104+ PCI/104e CAN Cards");
  37 MODULE_LICENSE("GPL v2");
  38
  39 #define DRV_NAME  "peak_pci"
  40
  41 struct peak_pciec_card;
  42 struct peak_pci_chan {
  43         void __iomem *cfg_base;         /* Common for all channels */
  44         struct net_device *prev_dev;    /* Chain of network devices */
  45         u16 icr_mask;                   /* Interrupt mask for fast ack */
  46         struct peak_pciec_card *pciec_card;     /* only for PCIeC LEDs */
  47 };
  48
  49 #define PEAK_PCI_CAN_CLOCK      (16000000 / 2)
  50
  51 #define PEAK_PCI_CDR            (CDR_CBP | CDR_CLKOUT_MASK)
  52 #define PEAK_PCI_OCR            OCR_TX0_PUSHPULL
  53
  54 /*
  55  * Important PITA registers
  56  */
  57 #define PITA_ICR                0x00    /* Interrupt control register */
  58 #define PITA_GPIOICR            0x18    /* GPIO interface control register */
  59 #define PITA_MISC               0x1C    /* Miscellaneous register */
  60
  61 #define PEAK_PCI_CFG_SIZE       0x1000  /* Size of the config PCI bar */
  62 #define PEAK_PCI_CHAN_SIZE      0x0400  /* Size used by the channel */
  63
  64 #define PEAK_PCI_VENDOR_ID      0x001C  /* The PCI device and vendor IDs */
  65 #define PEAK_PCI_DEVICE_ID      0x0001  /* for PCI/PCIe slot cards */
  66 #define PEAK_PCIEC_DEVICE_ID    0x0002  /* for ExpressCard slot cards */
  67 #define PEAK_PCIE_DEVICE_ID     0x0003  /* for nextgen PCIe slot cards */
  68 #define PEAK_CPCI_DEVICE_ID     0x0004  /* for nextgen cPCI slot cards */
  69 #define PEAK_MPCI_DEVICE_ID     0x0005  /* for nextgen miniPCI slot cards */
  70 #define PEAK_PC_104P_DEVICE_ID  0x0006  /* PCAN-PC/104+ cards */
  71 #define PEAK_PCI_104E_DEVICE_ID 0x0007  /* PCAN-PCI/104 Express cards */
  72 #define PEAK_MPCIE_DEVICE_ID    0x0008  /* The miniPCIe slot cards */
  73 #define PEAK_PCIE_OEM_ID        0x0009  /* PCAN-PCI Express OEM */
  74 #define PEAK_PCIEC34_DEVICE_ID  0x000A  /* PCAN-PCI Express 34 (one channel) */
  75
  76 #define PEAK_PCI_CHAN_MAX       4
  77
  78 static const u16 peak_pci_icr_masks[PEAK_PCI_CHAN_MAX] = {
  79         0x02, 0x01, 0x40, 0x80
  80 };
  81
  82 static const struct pci_device_id peak_pci_tbl[] = {
  83         {PEAK_PCI_VENDOR_ID, PEAK_PCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
  84         {PEAK_PCI_VENDOR_ID, PEAK_PCIE_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
  85         {PEAK_PCI_VENDOR_ID, PEAK_MPCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
  86         {PEAK_PCI_VENDOR_ID, PEAK_MPCIE_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
  87         {PEAK_PCI_VENDOR_ID, PEAK_PC_104P_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
  88         {PEAK_PCI_VENDOR_ID, PEAK_PCI_104E_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
  89         {PEAK_PCI_VENDOR_ID, PEAK_CPCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
  90 #ifdef CONFIG_CAN_PEAK_PCIEC
  91         {PEAK_PCI_VENDOR_ID, PEAK_PCIEC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
  92         {PEAK_PCI_VENDOR_ID, PEAK_PCIEC34_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
  93 #endif
  94         {0,}
  95 };
  96
  97 MODULE_DEVICE_TABLE(pci, peak_pci_tbl);
  98
  99 #ifdef CONFIG_CAN_PEAK_PCIEC
 100 /*
 101  * PCAN-ExpressCard needs I2C bit-banging configuration option.
 102  */
 103
 104 /* GPIOICR byte access offsets */
 105 #define PITA_GPOUT              0x18    /* GPx output value */
 106 #define PITA_GPIN               0x19    /* GPx input value */
 107 #define PITA_GPOEN              0x1A    /* configure GPx as ouput pin */
 108
 109 /* I2C GP bits */
 110 #define PITA_GPIN_SCL           0x01    /* Serial Clock Line */
 111 #define PITA_GPIN_SDA           0x04    /* Serial DAta line */
 112
 113 #define PCA9553_1_SLAVEADDR     (0xC4 >> 1)
 114
 115 /* PCA9553 LS0 fields values */
 116 enum {
 117         PCA9553_LOW,
 118         PCA9553_HIGHZ,
 119         PCA9553_PWM0,
 120         PCA9553_PWM1
 121 };
 122
 123 /* LEDs control */
 124 #define PCA9553_ON              PCA9553_LOW
 125 #define PCA9553_OFF             PCA9553_HIGHZ
 126 #define PCA9553_SLOW            PCA9553_PWM0
 127 #define PCA9553_FAST            PCA9553_PWM1
 128
 129 #define PCA9553_LED(c)          (1 << (c))
 130 #define PCA9553_LED_STATE(s, c) ((s) << ((c) << 1))
 131
 132 #define PCA9553_LED_ON(c)       PCA9553_LED_STATE(PCA9553_ON, c)
 133 #define PCA9553_LED_OFF(c)      PCA9553_LED_STATE(PCA9553_OFF, c)
 134 #define PCA9553_LED_SLOW(c)     PCA9553_LED_STATE(PCA9553_SLOW, c)
 135 #define PCA9553_LED_FAST(c)     PCA9553_LED_STATE(PCA9553_FAST, c)
 136 #define PCA9553_LED_MASK(c)     PCA9553_LED_STATE(0x03, c)
 137
 138 #define PCA9553_LED_OFF_ALL     (PCA9553_LED_OFF(0) | PCA9553_LED_OFF(1))
 139
 140 #define PCA9553_LS0_INIT        0x40 /* initial value (!= from 0x00) */
 141
 142 struct peak_pciec_chan {
 143         struct net_device *netdev;
 144         unsigned long prev_rx_bytes;
 145         unsigned long prev_tx_bytes;
 146 };
 147
 148 struct peak_pciec_card {
 149         void __iomem *cfg_base;         /* Common for all channels */
 150         void __iomem *reg_base;         /* first channel base address */
 151         u8 led_cache;                   /* leds state cache */
 152
 153         /* PCIExpressCard i2c data */
 154         struct i2c_algo_bit_data i2c_bit;
 155         struct i2c_adapter led_chip;
 156         struct delayed_work led_work;   /* led delayed work */
 157         int chan_count;
 158         struct peak_pciec_chan channel[PEAK_PCI_CHAN_MAX];
 159 };
 160
 161 /* "normal" pci register write callback is overloaded for leds control */
 162 static void peak_pci_write_reg(const struct sja1000_priv *priv,
 163                                int port, u8 val);
 164
 165 static inline void pita_set_scl_highz(struct peak_pciec_card *card)
 166 {
 167         u8 gp_outen = readb(card->cfg_base + PITA_GPOEN) & ~PITA_GPIN_SCL;
 168         writeb(gp_outen, card->cfg_base + PITA_GPOEN);
 169 }
 170
 171 static inline void pita_set_sda_highz(struct peak_pciec_card *card)
 172 {
 173         u8 gp_outen = readb(card->cfg_base + PITA_GPOEN) & ~PITA_GPIN_SDA;
 174         writeb(gp_outen, card->cfg_base + PITA_GPOEN);
 175 }
 176
 177 static void peak_pciec_init_pita_gpio(struct peak_pciec_card *card)
 178 {
 179         /* raise SCL & SDA GPIOs to high-Z */
 180         pita_set_scl_highz(card);
 181         pita_set_sda_highz(card);
 182 }
 183
 184 static void pita_setsda(void *data, int state)
 185 {
 186         struct peak_pciec_card *card = (struct peak_pciec_card *)data;
 187         u8 gp_out, gp_outen;
 188
 189         /* set output sda always to 0 */
 190         gp_out = readb(card->cfg_base + PITA_GPOUT) & ~PITA_GPIN_SDA;
 191         writeb(gp_out, card->cfg_base + PITA_GPOUT);
 192
 193         /* control output sda with GPOEN */
 194         gp_outen = readb(card->cfg_base + PITA_GPOEN);
 195         if (state)
 196                 gp_outen &= ~PITA_GPIN_SDA;
 197         else
 198                 gp_outen |= PITA_GPIN_SDA;
 199
 200         writeb(gp_outen, card->cfg_base + PITA_GPOEN);
 201 }
 202
 203 static void pita_setscl(void *data, int state)
 204 {
 205         struct peak_pciec_card *card = (struct peak_pciec_card *)data;
 206         u8 gp_out, gp_outen;
 207
 208         /* set output scl always to 0 */
 209         gp_out = readb(card->cfg_base + PITA_GPOUT) & ~PITA_GPIN_SCL;
 210         writeb(gp_out, card->cfg_base + PITA_GPOUT);
 211
 212         /* control output scl with GPOEN */
 213         gp_outen = readb(card->cfg_base + PITA_GPOEN);
 214         if (state)
 215                 gp_outen &= ~PITA_GPIN_SCL;
 216         else
 217                 gp_outen |= PITA_GPIN_SCL;
 218
 219         writeb(gp_outen, card->cfg_base + PITA_GPOEN);
 220 }
 221
 222 static int pita_getsda(void *data)
 223 {
 224         struct peak_pciec_card *card = (struct peak_pciec_card *)data;
 225
 226         /* set tristate */
 227         pita_set_sda_highz(card);
 228
 229         return (readb(card->cfg_base + PITA_GPIN) & PITA_GPIN_SDA) ? 1 : 0;
 230 }
 231
 232 static int pita_getscl(void *data)
 233 {
 234         struct peak_pciec_card *card = (struct peak_pciec_card *)data;
 235
 236         /* set tristate */
 237         pita_set_scl_highz(card);
 238
 239         return (readb(card->cfg_base + PITA_GPIN) & PITA_GPIN_SCL) ? 1 : 0;
 240 }
 241
 242 /*
 243  * write commands to the LED chip though the I2C-bus of the PCAN-PCIeC
 244  */
 245 static int peak_pciec_write_pca9553(struct peak_pciec_card *card,
 246                                     u8 offset, u8 data)
 247 {
 248         u8 buffer[2] = {
 249                 offset,
 250                 data
 251         };
 252         struct i2c_msg msg = {
 253                 .addr = PCA9553_1_SLAVEADDR,
 254                 .len = 2,
 255                 .buf = buffer,
 256         };
 257         int ret;
 258
 259         /* cache led mask */
 260         if ((offset == 5) && (data == card->led_cache))
 261                 return 0;
 262
 263         ret = i2c_transfer(&card->led_chip, &msg, 1);
 264         if (ret < 0)
 265                 return ret;
 266
 267         if (offset == 5)
 268                 card->led_cache = data;
 269
 270         return 0;
 271 }
 272
 273 /*
 274  * delayed work callback used to control the LEDs
 275  */
 276 static void peak_pciec_led_work(struct work_struct *work)
 277 {
 278         struct peak_pciec_card *card =
 279                 container_of(work, struct peak_pciec_card, led_work.work);
 280         struct net_device *netdev;
 281         u8 new_led = card->led_cache;
 282         int i, up_count = 0;
 283
 284         /* first check what is to do */
 285         for (i = 0; i < card->chan_count; i++) {
 286                 /* default is: not configured */
 287                 new_led &= ~PCA9553_LED_MASK(i);
 288                 new_led |= PCA9553_LED_ON(i);
 289
 290                 netdev = card->channel[i].netdev;
 291                 if (!netdev || !(netdev->flags & IFF_UP))
 292                         continue;
 293
 294                 up_count++;
 295
 296                 /* no activity (but configured) */
 297                 new_led &= ~PCA9553_LED_MASK(i);
 298                 new_led |= PCA9553_LED_SLOW(i);
 299
 300                 /* if bytes counters changed, set fast blinking led */
 301                 if (netdev->stats.rx_bytes != card->channel[i].prev_rx_bytes) {
 302                         card->channel[i].prev_rx_bytes = netdev->stats.rx_bytes;
 303                         new_led &= ~PCA9553_LED_MASK(i);
 304                         new_led |= PCA9553_LED_FAST(i);
 305                 }
 306                 if (netdev->stats.tx_bytes != card->channel[i].prev_tx_bytes) {
 307                         card->channel[i].prev_tx_bytes = netdev->stats.tx_bytes;
 308                         new_led &= ~PCA9553_LED_MASK(i);
 309                         new_led |= PCA9553_LED_FAST(i);
 310                 }
 311         }
 312
 313         /* check if LS0 settings changed, only update i2c if so */
 314         peak_pciec_write_pca9553(card, 5, new_led);
 315
 316         /* restart timer (except if no more configured channels) */
 317         if (up_count)
 318                 schedule_delayed_work(&card->led_work, HZ);
 319 }
 320
 321 /*
 322  * set LEDs blinking state
 323  */
 324 static void peak_pciec_set_leds(struct peak_pciec_card *card, u8 led_mask, u8 s)
 325 {
 326         u8 new_led = card->led_cache;
 327         int i;
 328
 329         /* first check what is to do */
 330         for (i = 0; i < card->chan_count; i++)
 331                 if (led_mask & PCA9553_LED(i)) {
 332                         new_led &= ~PCA9553_LED_MASK(i);
 333                         new_led |= PCA9553_LED_STATE(s, i);
 334                 }
 335
 336         /* check if LS0 settings changed, only update i2c if so */
 337         peak_pciec_write_pca9553(card, 5, new_led);
 338 }
 339
 340 /*
 341  * start one second delayed work to control LEDs
 342  */
 343 static void peak_pciec_start_led_work(struct peak_pciec_card *card)
 344 {
 345         schedule_delayed_work(&card->led_work, HZ);
 346 }
 347
 348 /*
 349  * stop LEDs delayed work
 350  */
 351 static void peak_pciec_stop_led_work(struct peak_pciec_card *card)
 352 {
 353         cancel_delayed_work_sync(&card->led_work);
 354 }
 355
 356 /*
 357  * initialize the PCA9553 4-bit I2C-bus LED chip
 358  */
 359 static int peak_pciec_init_leds(struct peak_pciec_card *card)
 360 {
 361         int err;
 362
 363         /* prescaler for frequency 0: "SLOW" = 1 Hz = "44" */
 364         err = peak_pciec_write_pca9553(card, 1, 44 / 1);
 365         if (err)
 366                 return err;
 367
 368         /* duty cycle 0: 50% */
 369         err = peak_pciec_write_pca9553(card, 2, 0x80);
 370         if (err)
 371                 return err;
 372
 373         /* prescaler for frequency 1: "FAST" = 5 Hz */
 374         err = peak_pciec_write_pca9553(card, 3, 44 / 5);
 375         if (err)
 376                 return err;
 377
 378         /* duty cycle 1: 50% */
 379         err = peak_pciec_write_pca9553(card, 4, 0x80);
 380         if (err)
 381                 return err;
 382
 383         /* switch LEDs to initial state */
 384         return peak_pciec_write_pca9553(card, 5, PCA9553_LS0_INIT);
 385 }
 386
 387 /*
 388  * restore LEDs state to off peak_pciec_leds_exit
 389  */
 390 static void peak_pciec_leds_exit(struct peak_pciec_card *card)
 391 {
 392         /* switch LEDs to off */
 393         peak_pciec_write_pca9553(card, 5, PCA9553_LED_OFF_ALL);
 394 }
 395
 396 /*
 397  * normal write sja1000 register method overloaded to catch when controller
 398  * is started or stopped, to control leds
 399  */
 400 static void peak_pciec_write_reg(const struct sja1000_priv *priv,
 401                                  int port, u8 val)
 402 {
 403         struct peak_pci_chan *chan = priv->priv;
 404         struct peak_pciec_card *card = chan->pciec_card;
 405         int c = (priv->reg_base - card->reg_base) / PEAK_PCI_CHAN_SIZE;
 406
 407         /* sja1000 register changes control the leds state */
 408         if (port == SJA1000_MOD)
 409                 switch (val) {
 410                 case MOD_RM:
 411                         /* Reset Mode: set led on */
 412                         peak_pciec_set_leds(card, PCA9553_LED(c), PCA9553_ON);
 413                         break;
 414                 case 0x00:
 415                         /* Normal Mode: led slow blinking and start led timer */
 416                         peak_pciec_set_leds(card, PCA9553_LED(c), PCA9553_SLOW);
 417                         peak_pciec_start_led_work(card);
 418                         break;
 419                 default:
 420                         break;
 421                 }
 422
 423         /* call base function */
 424         peak_pci_write_reg(priv, port, val);
 425 }
 426
 427 static struct i2c_algo_bit_data peak_pciec_i2c_bit_ops = {
 428         .setsda = pita_setsda,
 429         .setscl = pita_setscl,
 430         .getsda = pita_getsda,
 431         .getscl = pita_getscl,
 432         .udelay = 10,
 433         .timeout = HZ,
 434 };
 435
 436 static int peak_pciec_probe(struct pci_dev *pdev, struct net_device *dev)
 437 {
 438         struct sja1000_priv *priv = netdev_priv(dev);
 439         struct peak_pci_chan *chan = priv->priv;
 440         struct peak_pciec_card *card;
 441         int err;
 442
 443         /* copy i2c object address from 1st channel */
 444         if (chan->prev_dev) {
 445                 struct sja1000_priv *prev_priv = netdev_priv(chan->prev_dev);
 446                 struct peak_pci_chan *prev_chan = prev_priv->priv;
 447
 448                 card = prev_chan->pciec_card;
 449                 if (!card)
 450                         return -ENODEV;
 451
 452         /* channel is the first one: do the init part */
 453         } else {
 454                 /* create the bit banging I2C adapter structure */
 455                 card = kzalloc(sizeof(struct peak_pciec_card), GFP_KERNEL);
 456                 if (!card)
 457                         return -ENOMEM;
 458
 459                 card->cfg_base = chan->cfg_base;
 460                 card->reg_base = priv->reg_base;
 461
 462                 card->led_chip.owner = THIS_MODULE;
 463                 card->led_chip.dev.parent = &pdev->dev;
 464                 card->led_chip.algo_data = &card->i2c_bit;
 465                 strncpy(card->led_chip.name, "peak_i2c",
 466                         sizeof(card->led_chip.name));
 467
 468                 card->i2c_bit = peak_pciec_i2c_bit_ops;
 469                 card->i2c_bit.udelay = 10;
 470                 card->i2c_bit.timeout = HZ;
 471                 card->i2c_bit.data = card;
 472
 473                 peak_pciec_init_pita_gpio(card);
 474
 475                 err = i2c_bit_add_bus(&card->led_chip);
 476                 if (err) {
 477                         dev_err(&pdev->dev, "i2c init failed\n");
 478                         goto pciec_init_err_1;
 479                 }
 480
 481                 err = peak_pciec_init_leds(card);
 482                 if (err) {
 483                         dev_err(&pdev->dev, "leds hardware init failed\n");
 484                         goto pciec_init_err_2;
 485                 }
 486
 487                 INIT_DELAYED_WORK(&card->led_work, peak_pciec_led_work);
 488                 /* PCAN-ExpressCard needs its own callback for leds */
 489                 priv->write_reg = peak_pciec_write_reg;
 490         }
 491
 492         chan->pciec_card = card;
 493         card->channel[card->chan_count++].netdev = dev;
 494
 495         return 0;
 496
 497 pciec_init_err_2:
 498         i2c_del_adapter(&card->led_chip);
 499
 500 pciec_init_err_1:
 501         peak_pciec_init_pita_gpio(card);
 502         kfree(card);
 503
 504         return err;
 505 }
 506
 507 static void peak_pciec_remove(struct peak_pciec_card *card)
 508 {
 509         peak_pciec_stop_led_work(card);
 510         peak_pciec_leds_exit(card);
 511         i2c_del_adapter(&card->led_chip);
 512         peak_pciec_init_pita_gpio(card);
 513         kfree(card);
 514 }
 515
 516 #else /* CONFIG_CAN_PEAK_PCIEC */
 517
 518 /*
 519  * Placebo functions when PCAN-ExpressCard support is not selected
 520  */
 521 static inline int peak_pciec_probe(struct pci_dev *pdev, struct net_device *dev)
 522 {
 523         return -ENODEV;
 524 }
 525
 526 static inline void peak_pciec_remove(struct peak_pciec_card *card)
 527 {
 528 }
 529 #endif /* CONFIG_CAN_PEAK_PCIEC */
 530
 531 static u8 peak_pci_read_reg(const struct sja1000_priv *priv, int port)
 532 {
 533         return readb(priv->reg_base + (port << 2));
 534 }
 535
 536 static void peak_pci_write_reg(const struct sja1000_priv *priv,
 537                                int port, u8 val)
 538 {
 539         writeb(val, priv->reg_base + (port << 2));
 540 }
 541
 542 static void peak_pci_post_irq(const struct sja1000_priv *priv)
 543 {
 544         struct peak_pci_chan *chan = priv->priv;
 545         u16 icr;
 546
 547         /* Select and clear in PITA stored interrupt */
 548         icr = readw(chan->cfg_base + PITA_ICR);
 549         if (icr & chan->icr_mask)
 550                 writew(chan->icr_mask, chan->cfg_base + PITA_ICR);
 551 }
 552
 553 static int peak_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 554 {
 555         struct sja1000_priv *priv;
 556         struct peak_pci_chan *chan;
 557         struct net_device *dev, *prev_dev;
 558         void __iomem *cfg_base, *reg_base;
 559         u16 sub_sys_id, icr;
 560         int i, err, channels;
 561
 562         err = pci_enable_device(pdev);
 563         if (err)
 564                 return err;
 565
 566         err = pci_request_regions(pdev, DRV_NAME);
 567         if (err)
 568                 goto failure_disable_pci;
 569
 570         err = pci_read_config_word(pdev, 0x2e, &sub_sys_id);
 571         if (err)
 572                 goto failure_release_regions;
 573
 574         dev_dbg(&pdev->dev, "probing device %04x:%04x:%04x\n",
 575                 pdev->vendor, pdev->device, sub_sys_id);
 576
 577         err = pci_write_config_word(pdev, 0x44, 0);
 578         if (err)
 579                 goto failure_release_regions;
 580
 581         if (sub_sys_id >= 12)
 582                 channels = 4;
 583         else if (sub_sys_id >= 10)
 584                 channels = 3;
 585         else if (sub_sys_id >= 4)
 586                 channels = 2;
 587         else
 588                 channels = 1;
 589
 590         cfg_base = pci_iomap(pdev, 0, PEAK_PCI_CFG_SIZE);
 591         if (!cfg_base) {
 592                 dev_err(&pdev->dev, "failed to map PCI resource #0\n");
 593                 err = -ENOMEM;
 594                 goto failure_release_regions;
 595         }
 596
 597         reg_base = pci_iomap(pdev, 1, PEAK_PCI_CHAN_SIZE * channels);
 598         if (!reg_base) {
 599                 dev_err(&pdev->dev, "failed to map PCI resource #1\n");
 600                 err = -ENOMEM;
 601                 goto failure_unmap_cfg_base;
 602         }
 603
 604         /* Set GPIO control register */
 605         writew(0x0005, cfg_base + PITA_GPIOICR + 2);
 606         /* Enable all channels of this card */
 607         writeb(0x00, cfg_base + PITA_GPIOICR);
 608         /* Toggle reset */
 609         writeb(0x05, cfg_base + PITA_MISC + 3);
 610         mdelay(5);
 611         /* Leave parport mux mode */
 612         writeb(0x04, cfg_base + PITA_MISC + 3);
 613
 614         icr = readw(cfg_base + PITA_ICR + 2);
 615
 616         for (i = 0; i < channels; i++) {
 617                 dev = alloc_sja1000dev(sizeof(struct peak_pci_chan));
 618                 if (!dev) {
 619                         err = -ENOMEM;
 620                         goto failure_remove_channels;
 621                 }
 622
 623                 priv = netdev_priv(dev);
 624                 chan = priv->priv;
 625
 626                 chan->cfg_base = cfg_base;
 627                 priv->reg_base = reg_base + i * PEAK_PCI_CHAN_SIZE;
 628
 629                 priv->read_reg = peak_pci_read_reg;
 630                 priv->write_reg = peak_pci_write_reg;
 631                 priv->post_irq = peak_pci_post_irq;
 632
 633                 priv->can.clock.freq = PEAK_PCI_CAN_CLOCK;
 634                 priv->ocr = PEAK_PCI_OCR;
 635                 priv->cdr = PEAK_PCI_CDR;
 636                 /* Neither a slave nor a single device distributes the clock */
 637                 if (channels == 1 || i > 0)
 638                         priv->cdr |= CDR_CLK_OFF;
 639
 640                 /* Setup interrupt handling */
 641                 priv->irq_flags = IRQF_SHARED;
 642                 dev->irq = pdev->irq;
 643
 644                 chan->icr_mask = peak_pci_icr_masks[i];
 645                 icr |= chan->icr_mask;
 646
 647                 SET_NETDEV_DEV(dev, &pdev->dev);
 648                 dev->dev_id = i;
 649
 650                 /* Create chain of SJA1000 devices */
 651                 chan->prev_dev = pci_get_drvdata(pdev);
 652                 pci_set_drvdata(pdev, dev);
 653
 654                 /*
 655                  * PCAN-ExpressCard needs some additional i2c init.
 656                  * This must be done *before* register_sja1000dev() but
 657                  * *after* devices linkage
 658                  */
 659                 if (pdev->device == PEAK_PCIEC_DEVICE_ID ||
 660                     pdev->device == PEAK_PCIEC34_DEVICE_ID) {
 661                         err = peak_pciec_probe(pdev, dev);
 662                         if (err) {
 663                                 dev_err(&pdev->dev,
 664                                         "failed to probe device (err %d)\n",
 665                                         err);
 666                                 goto failure_free_dev;
 667                         }
 668                 }
 669
 670                 err = register_sja1000dev(dev);
 671                 if (err) {
 672                         dev_err(&pdev->dev, "failed to register device\n");
 673                         goto failure_free_dev;
 674                 }
 675
 676                 dev_info(&pdev->dev,
 677                          "%s at reg_base=0x%p cfg_base=0x%p irq=%d\n",
 678                          dev->name, priv->reg_base, chan->cfg_base, dev->irq);
 679         }
 680
 681         /* Enable interrupts */
 682         writew(icr, cfg_base + PITA_ICR + 2);
 683
 684         return 0;
 685
 686 failure_free_dev:
 687         pci_set_drvdata(pdev, chan->prev_dev);
 688         free_sja1000dev(dev);
 689
 690 failure_remove_channels:
 691         /* Disable interrupts */
 692         writew(0x0, cfg_base + PITA_ICR + 2);
 693
 694         chan = NULL;
 695         for (dev = pci_get_drvdata(pdev); dev; dev = prev_dev) {
 696                 priv = netdev_priv(dev);
 697                 chan = priv->priv;
 698                 prev_dev = chan->prev_dev;
 699
 700                 unregister_sja1000dev(dev);
 701                 free_sja1000dev(dev);
 702         }
 703
 704         /* free any PCIeC resources too */
 705         if (chan && chan->pciec_card)
 706                 peak_pciec_remove(chan->pciec_card);
 707
 708         pci_iounmap(pdev, reg_base);
 709
 710 failure_unmap_cfg_base:
 711         pci_iounmap(pdev, cfg_base);
 712
 713 failure_release_regions:
 714         pci_release_regions(pdev);
 715
 716 failure_disable_pci:
 717         pci_disable_device(pdev);
 718
 719         return err;
 720 }
 721
 722 static void peak_pci_remove(struct pci_dev *pdev)
 723 {
 724         struct net_device *dev = pci_get_drvdata(pdev); /* Last device */
 725         struct sja1000_priv *priv = netdev_priv(dev);
 726         struct peak_pci_chan *chan = priv->priv;
 727         void __iomem *cfg_base = chan->cfg_base;
 728         void __iomem *reg_base = priv->reg_base;
 729
 730         /* Disable interrupts */
 731         writew(0x0, cfg_base + PITA_ICR + 2);
 732
 733         /* Loop over all registered devices */
 734         while (1) {
 735                 struct net_device *prev_dev = chan->prev_dev;
 736
 737                 dev_info(&pdev->dev, "removing device %s\n", dev->name);
 738                 unregister_sja1000dev(dev);
 739                 free_sja1000dev(dev);
 740                 dev = prev_dev;
 741
 742                 if (!dev) {
 743                         /* do that only for first channel */
 744                         if (chan->pciec_card)
 745                                 peak_pciec_remove(chan->pciec_card);
 746                         break;
 747                 }
 748                 priv = netdev_priv(dev);
 749                 chan = priv->priv;
 750         }
 751
 752         pci_iounmap(pdev, reg_base);
 753         pci_iounmap(pdev, cfg_base);
 754         pci_release_regions(pdev);
 755         pci_disable_device(pdev);
 756 }
 757
 758 static struct pci_driver peak_pci_driver = {
 759         .name = DRV_NAME,
 760         .id_table = peak_pci_tbl,
 761         .probe = peak_pci_probe,
 762         .remove = peak_pci_remove,
 763 };
 764
 765 module_pci_driver(peak_pci_driver);