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