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         {PEAK_PCI_VENDOR_ID, PEAK_PCIE_OEM_ID, PCI_ANY_ID, PCI_ANY_ID,},
  91 #ifdef CONFIG_CAN_PEAK_PCIEC
  92         {PEAK_PCI_VENDOR_ID, PEAK_PCIEC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
  93         {PEAK_PCI_VENDOR_ID, PEAK_PCIEC34_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
  94 #endif
  95         {0,}
  96 };
  97
  98 MODULE_DEVICE_TABLE(pci, peak_pci_tbl);
  99
 100 #ifdef CONFIG_CAN_PEAK_PCIEC
 101 /*
 102  * PCAN-ExpressCard needs I2C bit-banging configuration option.
 103  */
 104
 105 /* GPIOICR byte access offsets */
 106 #define PITA_GPOUT              0x18    /* GPx output value */
 107 #define PITA_GPIN               0x19    /* GPx input value */
 108 #define PITA_GPOEN              0x1A    /* configure GPx as ouput pin */
 109
 110 /* I2C GP bits */
 111 #define PITA_GPIN_SCL           0x01    /* Serial Clock Line */
 112 #define PITA_GPIN_SDA           0x04    /* Serial DAta line */
 113
 114 #define PCA9553_1_SLAVEADDR     (0xC4 >> 1)
 115
 116 /* PCA9553 LS0 fields values */
 117 enum {
 118         PCA9553_LOW,
 119         PCA9553_HIGHZ,
 120         PCA9553_PWM0,
 121         PCA9553_PWM1
 122 };
 123
 124 /* LEDs control */
 125 #define PCA9553_ON              PCA9553_LOW
 126 #define PCA9553_OFF             PCA9553_HIGHZ
 127 #define PCA9553_SLOW            PCA9553_PWM0
 128 #define PCA9553_FAST            PCA9553_PWM1
 129
 130 #define PCA9553_LED(c)          (1 << (c))
 131 #define PCA9553_LED_STATE(s, c) ((s) << ((c) << 1))
 132
 133 #define PCA9553_LED_ON(c)       PCA9553_LED_STATE(PCA9553_ON, c)
 134 #define PCA9553_LED_OFF(c)      PCA9553_LED_STATE(PCA9553_OFF, c)
 135 #define PCA9553_LED_SLOW(c)     PCA9553_LED_STATE(PCA9553_SLOW, c)
 136 #define PCA9553_LED_FAST(c)     PCA9553_LED_STATE(PCA9553_FAST, c)
 137 #define PCA9553_LED_MASK(c)     PCA9553_LED_STATE(0x03, c)
 138
 139 #define PCA9553_LED_OFF_ALL     (PCA9553_LED_OFF(0) | PCA9553_LED_OFF(1))
 140
 141 #define PCA9553_LS0_INIT        0x40 /* initial value (!= from 0x00) */
 142
 143 struct peak_pciec_chan {
 144         struct net_device *netdev;
 145         unsigned long prev_rx_bytes;
 146         unsigned long prev_tx_bytes;
 147 };
 148
 149 struct peak_pciec_card {
 150         void __iomem *cfg_base;         /* Common for all channels */
 151         void __iomem *reg_base;         /* first channel base address */
 152         u8 led_cache;                   /* leds state cache */
 153
 154         /* PCIExpressCard i2c data */
 155         struct i2c_algo_bit_data i2c_bit;
 156         struct i2c_adapter led_chip;
 157         struct delayed_work led_work;   /* led delayed work */
 158         int chan_count;
 159         struct peak_pciec_chan channel[PEAK_PCI_CHAN_MAX];
 160 };
 161
 162 /* "normal" pci register write callback is overloaded for leds control */
 163 static void peak_pci_write_reg(const struct sja1000_priv *priv,
 164                                int port, u8 val);
 165
 166 static inline void pita_set_scl_highz(struct peak_pciec_card *card)
 167 {
 168         u8 gp_outen = readb(card->cfg_base + PITA_GPOEN) & ~PITA_GPIN_SCL;
 169         writeb(gp_outen, card->cfg_base + PITA_GPOEN);
 170 }
 171
 172 static inline void pita_set_sda_highz(struct peak_pciec_card *card)
 173 {
 174         u8 gp_outen = readb(card->cfg_base + PITA_GPOEN) & ~PITA_GPIN_SDA;
 175         writeb(gp_outen, card->cfg_base + PITA_GPOEN);
 176 }
 177
 178 static void peak_pciec_init_pita_gpio(struct peak_pciec_card *card)
 179 {
 180         /* raise SCL & SDA GPIOs to high-Z */
 181         pita_set_scl_highz(card);
 182         pita_set_sda_highz(card);
 183 }
 184
 185 static void pita_setsda(void *data, int state)
 186 {
 187         struct peak_pciec_card *card = (struct peak_pciec_card *)data;
 188         u8 gp_out, gp_outen;
 189
 190         /* set output sda always to 0 */
 191         gp_out = readb(card->cfg_base + PITA_GPOUT) & ~PITA_GPIN_SDA;
 192         writeb(gp_out, card->cfg_base + PITA_GPOUT);
 193
 194         /* control output sda with GPOEN */
 195         gp_outen = readb(card->cfg_base + PITA_GPOEN);
 196         if (state)
 197                 gp_outen &= ~PITA_GPIN_SDA;
 198         else
 199                 gp_outen |= PITA_GPIN_SDA;
 200
 201         writeb(gp_outen, card->cfg_base + PITA_GPOEN);
 202 }
 203
 204 static void pita_setscl(void *data, int state)
 205 {
 206         struct peak_pciec_card *card = (struct peak_pciec_card *)data;
 207         u8 gp_out, gp_outen;
 208
 209         /* set output scl always to 0 */
 210         gp_out = readb(card->cfg_base + PITA_GPOUT) & ~PITA_GPIN_SCL;
 211         writeb(gp_out, card->cfg_base + PITA_GPOUT);
 212
 213         /* control output scl with GPOEN */
 214         gp_outen = readb(card->cfg_base + PITA_GPOEN);
 215         if (state)
 216                 gp_outen &= ~PITA_GPIN_SCL;
 217         else
 218                 gp_outen |= PITA_GPIN_SCL;
 219
 220         writeb(gp_outen, card->cfg_base + PITA_GPOEN);
 221 }
 222
 223 static int pita_getsda(void *data)
 224 {
 225         struct peak_pciec_card *card = (struct peak_pciec_card *)data;
 226
 227         /* set tristate */
 228         pita_set_sda_highz(card);
 229
 230         return (readb(card->cfg_base + PITA_GPIN) & PITA_GPIN_SDA) ? 1 : 0;
 231 }
 232
 233 static int pita_getscl(void *data)
 234 {
 235         struct peak_pciec_card *card = (struct peak_pciec_card *)data;
 236
 237         /* set tristate */
 238         pita_set_scl_highz(card);
 239
 240         return (readb(card->cfg_base + PITA_GPIN) & PITA_GPIN_SCL) ? 1 : 0;
 241 }
 242
 243 /*
 244  * write commands to the LED chip though the I2C-bus of the PCAN-PCIeC
 245  */
 246 static int peak_pciec_write_pca9553(struct peak_pciec_card *card,
 247                                     u8 offset, u8 data)
 248 {
 249         u8 buffer[2] = {
 250                 offset,
 251                 data
 252         };
 253         struct i2c_msg msg = {
 254                 .addr = PCA9553_1_SLAVEADDR,
 255                 .len = 2,
 256                 .buf = buffer,
 257         };
 258         int ret;
 259
 260         /* cache led mask */
 261         if ((offset == 5) && (data == card->led_cache))
 262                 return 0;
 263
 264         ret = i2c_transfer(&card->led_chip, &msg, 1);
 265         if (ret < 0)
 266                 return ret;
 267
 268         if (offset == 5)
 269                 card->led_cache = data;
 270
 271         return 0;
 272 }
 273
 274 /*
 275  * delayed work callback used to control the LEDs
 276  */
 277 static void peak_pciec_led_work(struct work_struct *work)
 278 {
 279         struct peak_pciec_card *card =
 280                 container_of(work, struct peak_pciec_card, led_work.work);
 281         struct net_device *netdev;
 282         u8 new_led = card->led_cache;
 283         int i, up_count = 0;
 284
 285         /* first check what is to do */
 286         for (i = 0; i < card->chan_count; i++) {
 287                 /* default is: not configured */
 288                 new_led &= ~PCA9553_LED_MASK(i);
 289                 new_led |= PCA9553_LED_ON(i);
 290
 291                 netdev = card->channel[i].netdev;
 292                 if (!netdev || !(netdev->flags & IFF_UP))
 293                         continue;
 294
 295                 up_count++;
 296
 297                 /* no activity (but configured) */
 298                 new_led &= ~PCA9553_LED_MASK(i);
 299                 new_led |= PCA9553_LED_SLOW(i);
 300
 301                 /* if bytes counters changed, set fast blinking led */
 302                 if (netdev->stats.rx_bytes != card->channel[i].prev_rx_bytes) {
 303                         card->channel[i].prev_rx_bytes = netdev->stats.rx_bytes;
 304                         new_led &= ~PCA9553_LED_MASK(i);
 305                         new_led |= PCA9553_LED_FAST(i);
 306                 }
 307                 if (netdev->stats.tx_bytes != card->channel[i].prev_tx_bytes) {
 308                         card->channel[i].prev_tx_bytes = netdev->stats.tx_bytes;
 309                         new_led &= ~PCA9553_LED_MASK(i);
 310                         new_led |= PCA9553_LED_FAST(i);
 311                 }
 312         }
 313
 314         /* check if LS0 settings changed, only update i2c if so */
 315         peak_pciec_write_pca9553(card, 5, new_led);
 316
 317         /* restart timer (except if no more configured channels) */
 318         if (up_count)
 319                 schedule_delayed_work(&card->led_work, HZ);
 320 }
 321
 322 /*
 323  * set LEDs blinking state
 324  */
 325 static void peak_pciec_set_leds(struct peak_pciec_card *card, u8 led_mask, u8 s)
 326 {
 327         u8 new_led = card->led_cache;
 328         int i;
 329
 330         /* first check what is to do */
 331         for (i = 0; i < card->chan_count; i++)
 332                 if (led_mask & PCA9553_LED(i)) {
 333                         new_led &= ~PCA9553_LED_MASK(i);
 334                         new_led |= PCA9553_LED_STATE(s, i);
 335                 }
 336
 337         /* check if LS0 settings changed, only update i2c if so */
 338         peak_pciec_write_pca9553(card, 5, new_led);
 339 }
 340
 341 /*
 342  * start one second delayed work to control LEDs
 343  */
 344 static void peak_pciec_start_led_work(struct peak_pciec_card *card)
 345 {
 346         schedule_delayed_work(&card->led_work, HZ);
 347 }
 348
 349 /*
 350  * stop LEDs delayed work
 351  */
 352 static void peak_pciec_stop_led_work(struct peak_pciec_card *card)
 353 {
 354         cancel_delayed_work_sync(&card->led_work);
 355 }
 356
 357 /*
 358  * initialize the PCA9553 4-bit I2C-bus LED chip
 359  */
 360 static int peak_pciec_init_leds(struct peak_pciec_card *card)
 361 {
 362         int err;
 363
 364         /* prescaler for frequency 0: "SLOW" = 1 Hz = "44" */
 365         err = peak_pciec_write_pca9553(card, 1, 44 / 1);
 366         if (err)
 367                 return err;
 368
 369         /* duty cycle 0: 50% */
 370         err = peak_pciec_write_pca9553(card, 2, 0x80);
 371         if (err)
 372                 return err;
 373
 374         /* prescaler for frequency 1: "FAST" = 5 Hz */
 375         err = peak_pciec_write_pca9553(card, 3, 44 / 5);
 376         if (err)
 377                 return err;
 378
 379         /* duty cycle 1: 50% */
 380         err = peak_pciec_write_pca9553(card, 4, 0x80);
 381         if (err)
 382                 return err;
 383
 384         /* switch LEDs to initial state */
 385         return peak_pciec_write_pca9553(card, 5, PCA9553_LS0_INIT);
 386 }
 387
 388 /*
 389  * restore LEDs state to off peak_pciec_leds_exit
 390  */
 391 static void peak_pciec_leds_exit(struct peak_pciec_card *card)
 392 {
 393         /* switch LEDs to off */
 394         peak_pciec_write_pca9553(card, 5, PCA9553_LED_OFF_ALL);
 395 }
 396
 397 /*
 398  * normal write sja1000 register method overloaded to catch when controller
 399  * is started or stopped, to control leds
 400  */
 401 static void peak_pciec_write_reg(const struct sja1000_priv *priv,
 402                                  int port, u8 val)
 403 {
 404         struct peak_pci_chan *chan = priv->priv;
 405         struct peak_pciec_card *card = chan->pciec_card;
 406         int c = (priv->reg_base - card->reg_base) / PEAK_PCI_CHAN_SIZE;
 407
 408         /* sja1000 register changes control the leds state */
 409         if (port == SJA1000_MOD)
 410                 switch (val) {
 411                 case MOD_RM:
 412                         /* Reset Mode: set led on */
 413                         peak_pciec_set_leds(card, PCA9553_LED(c), PCA9553_ON);
 414                         break;
 415                 case 0x00:
 416                         /* Normal Mode: led slow blinking and start led timer */
 417                         peak_pciec_set_leds(card, PCA9553_LED(c), PCA9553_SLOW);
 418                         peak_pciec_start_led_work(card);
 419                         break;
 420                 default:
 421                         break;
 422                 }
 423
 424         /* call base function */
 425         peak_pci_write_reg(priv, port, val);
 426 }
 427
 428 static struct i2c_algo_bit_data peak_pciec_i2c_bit_ops = {
 429         .setsda = pita_setsda,
 430         .setscl = pita_setscl,
 431         .getsda = pita_getsda,
 432         .getscl = pita_getscl,
 433         .udelay = 10,
 434         .timeout = HZ,
 435 };
 436
 437 static int peak_pciec_probe(struct pci_dev *pdev, struct net_device *dev)
 438 {
 439         struct sja1000_priv *priv = netdev_priv(dev);
 440         struct peak_pci_chan *chan = priv->priv;
 441         struct peak_pciec_card *card;
 442         int err;
 443
 444         /* copy i2c object address from 1st channel */
 445         if (chan->prev_dev) {
 446                 struct sja1000_priv *prev_priv = netdev_priv(chan->prev_dev);
 447                 struct peak_pci_chan *prev_chan = prev_priv->priv;
 448
 449                 card = prev_chan->pciec_card;
 450                 if (!card)
 451                         return -ENODEV;
 452
 453         /* channel is the first one: do the init part */
 454         } else {
 455                 /* create the bit banging I2C adapter structure */
 456                 card = kzalloc(sizeof(struct peak_pciec_card), GFP_KERNEL);
 457                 if (!card)
 458                         return -ENOMEM;
 459
 460                 card->cfg_base = chan->cfg_base;
 461                 card->reg_base = priv->reg_base;
 462
 463                 card->led_chip.owner = THIS_MODULE;
 464                 card->led_chip.dev.parent = &pdev->dev;
 465                 card->led_chip.algo_data = &card->i2c_bit;
 466                 strncpy(card->led_chip.name, "peak_i2c",
 467                         sizeof(card->led_chip.name));
 468
 469                 card->i2c_bit = peak_pciec_i2c_bit_ops;
 470                 card->i2c_bit.udelay = 10;
 471                 card->i2c_bit.timeout = HZ;
 472                 card->i2c_bit.data = card;
 473
 474                 peak_pciec_init_pita_gpio(card);
 475
 476                 err = i2c_bit_add_bus(&card->led_chip);
 477                 if (err) {
 478                         dev_err(&pdev->dev, "i2c init failed\n");
 479                         goto pciec_init_err_1;
 480                 }
 481
 482                 err = peak_pciec_init_leds(card);
 483                 if (err) {
 484                         dev_err(&pdev->dev, "leds hardware init failed\n");
 485                         goto pciec_init_err_2;
 486                 }
 487
 488                 INIT_DELAYED_WORK(&card->led_work, peak_pciec_led_work);
 489                 /* PCAN-ExpressCard needs its own callback for leds */
 490                 priv->write_reg = peak_pciec_write_reg;
 491         }
 492
 493         chan->pciec_card = card;
 494         card->channel[card->chan_count++].netdev = dev;
 495
 496         return 0;
 497
 498 pciec_init_err_2:
 499         i2c_del_adapter(&card->led_chip);
 500
 501 pciec_init_err_1:
 502         peak_pciec_init_pita_gpio(card);
 503         kfree(card);
 504
 505         return err;
 506 }
 507
 508 static void peak_pciec_remove(struct peak_pciec_card *card)
 509 {
 510         peak_pciec_stop_led_work(card);
 511         peak_pciec_leds_exit(card);
 512         i2c_del_adapter(&card->led_chip);
 513         peak_pciec_init_pita_gpio(card);
 514         kfree(card);
 515 }
 516
 517 #else /* CONFIG_CAN_PEAK_PCIEC */
 518
 519 /*
 520  * Placebo functions when PCAN-ExpressCard support is not selected
 521  */
 522 static inline int peak_pciec_probe(struct pci_dev *pdev, struct net_device *dev)
 523 {
 524         return -ENODEV;
 525 }
 526
 527 static inline void peak_pciec_remove(struct peak_pciec_card *card)
 528 {
 529 }
 530 #endif /* CONFIG_CAN_PEAK_PCIEC */
 531
 532 static u8 peak_pci_read_reg(const struct sja1000_priv *priv, int port)
 533 {
 534         return readb(priv->reg_base + (port << 2));
 535 }
 536
 537 static void peak_pci_write_reg(const struct sja1000_priv *priv,
 538                                int port, u8 val)
 539 {
 540         writeb(val, priv->reg_base + (port << 2));
 541 }
 542
 543 static void peak_pci_post_irq(const struct sja1000_priv *priv)
 544 {
 545         struct peak_pci_chan *chan = priv->priv;
 546         u16 icr;
 547
 548         /* Select and clear in PITA stored interrupt */
 549         icr = readw(chan->cfg_base + PITA_ICR);
 550         if (icr & chan->icr_mask)
 551                 writew(chan->icr_mask, chan->cfg_base + PITA_ICR);
 552 }
 553
 554 static int peak_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 555 {
 556         struct sja1000_priv *priv;
 557         struct peak_pci_chan *chan;
 558         struct net_device *dev, *prev_dev;
 559         void __iomem *cfg_base, *reg_base;
 560         u16 sub_sys_id, icr;
 561         int i, err, channels;
 562
 563         err = pci_enable_device(pdev);
 564         if (err)
 565                 return err;
 566
 567         err = pci_request_regions(pdev, DRV_NAME);
 568         if (err)
 569                 goto failure_disable_pci;
 570
 571         err = pci_read_config_word(pdev, 0x2e, &sub_sys_id);
 572         if (err)
 573                 goto failure_release_regions;
 574
 575         dev_dbg(&pdev->dev, "probing device %04x:%04x:%04x\n",
 576                 pdev->vendor, pdev->device, sub_sys_id);
 577
 578         err = pci_write_config_word(pdev, 0x44, 0);
 579         if (err)
 580                 goto failure_release_regions;
 581
 582         if (sub_sys_id >= 12)
 583                 channels = 4;
 584         else if (sub_sys_id >= 10)
 585                 channels = 3;
 586         else if (sub_sys_id >= 4)
 587                 channels = 2;
 588         else
 589                 channels = 1;
 590
 591         cfg_base = pci_iomap(pdev, 0, PEAK_PCI_CFG_SIZE);
 592         if (!cfg_base) {
 593                 dev_err(&pdev->dev, "failed to map PCI resource #0\n");
 594                 err = -ENOMEM;
 595                 goto failure_release_regions;
 596         }
 597
 598         reg_base = pci_iomap(pdev, 1, PEAK_PCI_CHAN_SIZE * channels);
 599         if (!reg_base) {
 600                 dev_err(&pdev->dev, "failed to map PCI resource #1\n");
 601                 err = -ENOMEM;
 602                 goto failure_unmap_cfg_base;
 603         }
 604
 605         /* Set GPIO control register */
 606         writew(0x0005, cfg_base + PITA_GPIOICR + 2);
 607         /* Enable all channels of this card */
 608         writeb(0x00, cfg_base + PITA_GPIOICR);
 609         /* Toggle reset */
 610         writeb(0x05, cfg_base + PITA_MISC + 3);
 611         usleep_range(5000, 6000);
 612         /* Leave parport mux mode */
 613         writeb(0x04, cfg_base + PITA_MISC + 3);
 614
 615         icr = readw(cfg_base + PITA_ICR + 2);
 616
 617         for (i = 0; i < channels; i++) {
 618                 dev = alloc_sja1000dev(sizeof(struct peak_pci_chan));
 619                 if (!dev) {
 620                         err = -ENOMEM;
 621                         goto failure_remove_channels;
 622                 }
 623
 624                 priv = netdev_priv(dev);
 625                 chan = priv->priv;
 626
 627                 chan->cfg_base = cfg_base;
 628                 priv->reg_base = reg_base + i * PEAK_PCI_CHAN_SIZE;
 629
 630                 priv->read_reg = peak_pci_read_reg;
 631                 priv->write_reg = peak_pci_write_reg;
 632                 priv->post_irq = peak_pci_post_irq;
 633
 634                 priv->can.clock.freq = PEAK_PCI_CAN_CLOCK;
 635                 priv->ocr = PEAK_PCI_OCR;
 636                 priv->cdr = PEAK_PCI_CDR;
 637                 /* Neither a slave nor a single device distributes the clock */
 638                 if (channels == 1 || i > 0)
 639                         priv->cdr |= CDR_CLK_OFF;
 640
 641                 /* Setup interrupt handling */
 642                 priv->irq_flags = IRQF_SHARED;
 643                 dev->irq = pdev->irq;
 644
 645                 chan->icr_mask = peak_pci_icr_masks[i];
 646                 icr |= chan->icr_mask;
 647
 648                 SET_NETDEV_DEV(dev, &pdev->dev);
 649                 dev->dev_id = i;
 650
 651                 /* Create chain of SJA1000 devices */
 652                 chan->prev_dev = pci_get_drvdata(pdev);
 653                 pci_set_drvdata(pdev, dev);
 654
 655                 /*
 656                  * PCAN-ExpressCard needs some additional i2c init.
 657                  * This must be done *before* register_sja1000dev() but
 658                  * *after* devices linkage
 659                  */
 660                 if (pdev->device == PEAK_PCIEC_DEVICE_ID ||
 661                     pdev->device == PEAK_PCIEC34_DEVICE_ID) {
 662                         err = peak_pciec_probe(pdev, dev);
 663                         if (err) {
 664                                 dev_err(&pdev->dev,
 665                                         "failed to probe device (err %d)\n",
 666                                         err);
 667                                 goto failure_free_dev;
 668                         }
 669                 }
 670
 671                 err = register_sja1000dev(dev);
 672                 if (err) {
 673                         dev_err(&pdev->dev, "failed to register device\n");
 674                         goto failure_free_dev;
 675                 }
 676
 677                 dev_info(&pdev->dev,
 678                          "%s at reg_base=0x%p cfg_base=0x%p irq=%d\n",
 679                          dev->name, priv->reg_base, chan->cfg_base, dev->irq);
 680         }
 681
 682         /* Enable interrupts */
 683         writew(icr, cfg_base + PITA_ICR + 2);
 684
 685         return 0;
 686
 687 failure_free_dev:
 688         pci_set_drvdata(pdev, chan->prev_dev);
 689         free_sja1000dev(dev);
 690
 691 failure_remove_channels:
 692         /* Disable interrupts */
 693         writew(0x0, cfg_base + PITA_ICR + 2);
 694
 695         chan = NULL;
 696         for (dev = pci_get_drvdata(pdev); dev; dev = prev_dev) {
 697                 priv = netdev_priv(dev);
 698                 chan = priv->priv;
 699                 prev_dev = chan->prev_dev;
 700
 701                 unregister_sja1000dev(dev);
 702                 free_sja1000dev(dev);
 703         }
 704
 705         /* free any PCIeC resources too */
 706         if (chan && chan->pciec_card)
 707                 peak_pciec_remove(chan->pciec_card);
 708
 709         pci_iounmap(pdev, reg_base);
 710
 711 failure_unmap_cfg_base:
 712         pci_iounmap(pdev, cfg_base);
 713
 714 failure_release_regions:
 715         pci_release_regions(pdev);
 716
 717 failure_disable_pci:
 718         pci_disable_device(pdev);
 719
 720         /* pci_xxx_config_word() return positive PCIBIOS_xxx error codes while
 721          * the probe() function must return a negative errno in case of failure
 722          * (err is unchanged if negative) */
 723         return pcibios_err_to_errno(err);
 724 }
 725
 726 static void peak_pci_remove(struct pci_dev *pdev)
 727 {
 728         struct net_device *dev = pci_get_drvdata(pdev); /* Last device */
 729         struct sja1000_priv *priv = netdev_priv(dev);
 730         struct peak_pci_chan *chan = priv->priv;
 731         void __iomem *cfg_base = chan->cfg_base;
 732         void __iomem *reg_base = priv->reg_base;
 733
 734         /* Disable interrupts */
 735         writew(0x0, cfg_base + PITA_ICR + 2);
 736
 737         /* Loop over all registered devices */
 738         while (1) {
 739                 struct net_device *prev_dev = chan->prev_dev;
 740
 741                 dev_info(&pdev->dev, "removing device %s\n", dev->name);
 742                 unregister_sja1000dev(dev);
 743                 free_sja1000dev(dev);
 744                 dev = prev_dev;
 745
 746                 if (!dev) {
 747                         /* do that only for first channel */
 748                         if (chan->pciec_card)
 749                                 peak_pciec_remove(chan->pciec_card);
 750                         break;
 751                 }
 752                 priv = netdev_priv(dev);
 753                 chan = priv->priv;
 754         }
 755
 756         pci_iounmap(pdev, reg_base);
 757         pci_iounmap(pdev, cfg_base);
 758         pci_release_regions(pdev);
 759         pci_disable_device(pdev);
 760 }
 761
 762 static struct pci_driver peak_pci_driver = {
 763         .name = DRV_NAME,
 764         .id_table = peak_pci_tbl,
 765         .probe = peak_pci_probe,
 766         .remove = peak_pci_remove,
 767 };
 768
 769 module_pci_driver(peak_pci_driver);