drivers/net/can/sja1000/sja1000.c

   1 /*
   2  * sja1000.c -  Philips SJA1000 network device driver
   3  *
   4  * Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
   5  * 38106 Braunschweig, GERMANY
   6  *
   7  * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of Volkswagen nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * Alternatively, provided that this notice is retained in full, this
  23  * software may be distributed under the terms of the GNU General
  24  * Public License ("GPL") version 2, in which case the provisions of the
  25  * GPL apply INSTEAD OF those given above.
  26  *
  27  * The provided data structures and external interfaces from this code
  28  * are not restricted to be used by modules with a GPL compatible license.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  31  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  32  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  33  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  34  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  35  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  36  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  37  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  38  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  39  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  40  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  41  * DAMAGE.
  42  *
  43  */
  44
  45 #include <linux/module.h>
  46 #include <linux/init.h>
  47 #include <linux/kernel.h>
  48 #include <linux/sched.h>
  49 #include <linux/types.h>
  50 #include <linux/fcntl.h>
  51 #include <linux/interrupt.h>
  52 #include <linux/ptrace.h>
  53 #include <linux/string.h>
  54 #include <linux/errno.h>
  55 #include <linux/netdevice.h>
  56 #include <linux/if_arp.h>
  57 #include <linux/if_ether.h>
  58 #include <linux/skbuff.h>
  59 #include <linux/delay.h>
  60
  61 #include <linux/can/dev.h>
  62 #include <linux/can/error.h>
  63
  64 #include "sja1000.h"
  65
  66 #define DRV_NAME "sja1000"
  67
  68 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
  69 MODULE_LICENSE("Dual BSD/GPL");
  70 MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
  71
  72 static const struct can_bittiming_const sja1000_bittiming_const = {
  73         .name = DRV_NAME,
  74         .tseg1_min = 1,
  75         .tseg1_max = 16,
  76         .tseg2_min = 1,
  77         .tseg2_max = 8,
  78         .sjw_max = 4,
  79         .brp_min = 1,
  80         .brp_max = 64,
  81         .brp_inc = 1,
  82 };
  83
  84 static void sja1000_write_cmdreg(struct sja1000_priv *priv, u8 val)
  85 {
  86         unsigned long flags;
  87
  88         /*
  89          * The command register needs some locking and time to settle
  90          * the write_reg() operation - especially on SMP systems.
  91          */
  92         spin_lock_irqsave(&priv->cmdreg_lock, flags);
  93         priv->write_reg(priv, REG_CMR, val);
  94         priv->read_reg(priv, REG_SR);
  95         spin_unlock_irqrestore(&priv->cmdreg_lock, flags);
  96 }
  97
  98 static int sja1000_is_absent(struct sja1000_priv *priv)
  99 {
 100         return (priv->read_reg(priv, REG_MOD) == 0xFF);
 101 }
 102
 103 static int sja1000_probe_chip(struct net_device *dev)
 104 {
 105         struct sja1000_priv *priv = netdev_priv(dev);
 106
 107         if (priv->reg_base && sja1000_is_absent(priv)) {
 108                 printk(KERN_INFO "%s: probing @0x%lX failed\n",
 109                        DRV_NAME, dev->base_addr);
 110                 return 0;
 111         }
 112         return -1;
 113 }
 114
 115 static void set_reset_mode(struct net_device *dev)
 116 {
 117         struct sja1000_priv *priv = netdev_priv(dev);
 118         unsigned char status = priv->read_reg(priv, REG_MOD);
 119         int i;
 120
 121         /* disable interrupts */
 122         priv->write_reg(priv, REG_IER, IRQ_OFF);
 123
 124         for (i = 0; i < 100; i++) {
 125                 /* check reset bit */
 126                 if (status & MOD_RM) {
 127                         priv->can.state = CAN_STATE_STOPPED;
 128                         return;
 129                 }
 130
 131                 priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */
 132                 udelay(10);
 133                 status = priv->read_reg(priv, REG_MOD);
 134         }
 135
 136         netdev_err(dev, "setting SJA1000 into reset mode failed!\n");
 137 }
 138
 139 static void set_normal_mode(struct net_device *dev)
 140 {
 141         struct sja1000_priv *priv = netdev_priv(dev);
 142         unsigned char status = priv->read_reg(priv, REG_MOD);
 143         int i;
 144
 145         for (i = 0; i < 100; i++) {
 146                 /* check reset bit */
 147                 if ((status & MOD_RM) == 0) {
 148                         priv->can.state = CAN_STATE_ERROR_ACTIVE;
 149                         /* enable interrupts */
 150                         if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
 151                                 priv->write_reg(priv, REG_IER, IRQ_ALL);
 152                         else
 153                                 priv->write_reg(priv, REG_IER,
 154                                                 IRQ_ALL & ~IRQ_BEI);
 155                         return;
 156                 }
 157
 158                 /* set chip to normal mode */
 159                 priv->write_reg(priv, REG_MOD, 0x00);
 160                 udelay(10);
 161                 status = priv->read_reg(priv, REG_MOD);
 162         }
 163
 164         netdev_err(dev, "setting SJA1000 into normal mode failed!\n");
 165 }
 166
 167 static void sja1000_start(struct net_device *dev)
 168 {
 169         struct sja1000_priv *priv = netdev_priv(dev);
 170
 171         /* leave reset mode */
 172         if (priv->can.state != CAN_STATE_STOPPED)
 173                 set_reset_mode(dev);
 174
 175         /* Clear error counters and error code capture */
 176         priv->write_reg(priv, REG_TXERR, 0x0);
 177         priv->write_reg(priv, REG_RXERR, 0x0);
 178         priv->read_reg(priv, REG_ECC);
 179
 180         /* leave reset mode */
 181         set_normal_mode(dev);
 182 }
 183
 184 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
 185 {
 186         struct sja1000_priv *priv = netdev_priv(dev);
 187
 188         if (!priv->open_time)
 189                 return -EINVAL;
 190
 191         switch (mode) {
 192         case CAN_MODE_START:
 193                 sja1000_start(dev);
 194                 if (netif_queue_stopped(dev))
 195                         netif_wake_queue(dev);
 196                 break;
 197
 198         default:
 199                 return -EOPNOTSUPP;
 200         }
 201
 202         return 0;
 203 }
 204
 205 static int sja1000_set_bittiming(struct net_device *dev)
 206 {
 207         struct sja1000_priv *priv = netdev_priv(dev);
 208         struct can_bittiming *bt = &priv->can.bittiming;
 209         u8 btr0, btr1;
 210
 211         btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
 212         btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
 213                 (((bt->phase_seg2 - 1) & 0x7) << 4);
 214         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
 215                 btr1 |= 0x80;
 216
 217         netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
 218
 219         priv->write_reg(priv, REG_BTR0, btr0);
 220         priv->write_reg(priv, REG_BTR1, btr1);
 221
 222         return 0;
 223 }
 224
 225 static int sja1000_get_berr_counter(const struct net_device *dev,
 226                                     struct can_berr_counter *bec)
 227 {
 228         struct sja1000_priv *priv = netdev_priv(dev);
 229
 230         bec->txerr = priv->read_reg(priv, REG_TXERR);
 231         bec->rxerr = priv->read_reg(priv, REG_RXERR);
 232
 233         return 0;
 234 }
 235
 236 /*
 237  * initialize SJA1000 chip:
 238  *   - reset chip
 239  *   - set output mode
 240  *   - set baudrate
 241  *   - enable interrupts
 242  *   - start operating mode
 243  */
 244 static void chipset_init(struct net_device *dev)
 245 {
 246         struct sja1000_priv *priv = netdev_priv(dev);
 247
 248         /* set clock divider and output control register */
 249         priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN);
 250
 251         /* set acceptance filter (accept all) */
 252         priv->write_reg(priv, REG_ACCC0, 0x00);
 253         priv->write_reg(priv, REG_ACCC1, 0x00);
 254         priv->write_reg(priv, REG_ACCC2, 0x00);
 255         priv->write_reg(priv, REG_ACCC3, 0x00);
 256
 257         priv->write_reg(priv, REG_ACCM0, 0xFF);
 258         priv->write_reg(priv, REG_ACCM1, 0xFF);
 259         priv->write_reg(priv, REG_ACCM2, 0xFF);
 260         priv->write_reg(priv, REG_ACCM3, 0xFF);
 261
 262         priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL);
 263 }
 264
 265 /*
 266  * transmit a CAN message
 267  * message layout in the sk_buff should be like this:
 268  * xx xx xx xx   ff      ll   00 11 22 33 44 55 66 77
 269  * [  can-id ] [flags] [len] [can data (up to 8 bytes]
 270  */
 271 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
 272                                             struct net_device *dev)
 273 {
 274         struct sja1000_priv *priv = netdev_priv(dev);
 275         struct can_frame *cf = (struct can_frame *)skb->data;
 276         uint8_t fi;
 277         uint8_t dlc;
 278         canid_t id;
 279         uint8_t dreg;
 280         int i;
 281
 282         if (can_dropped_invalid_skb(dev, skb))
 283                 return NETDEV_TX_OK;
 284
 285         netif_stop_queue(dev);
 286
 287         fi = dlc = cf->can_dlc;
 288         id = cf->can_id;
 289
 290         if (id & CAN_RTR_FLAG)
 291                 fi |= FI_RTR;
 292
 293         if (id & CAN_EFF_FLAG) {
 294                 fi |= FI_FF;
 295                 dreg = EFF_BUF;
 296                 priv->write_reg(priv, REG_FI, fi);
 297                 priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
 298                 priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
 299                 priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
 300                 priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
 301         } else {
 302                 dreg = SFF_BUF;
 303                 priv->write_reg(priv, REG_FI, fi);
 304                 priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
 305                 priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
 306         }
 307
 308         for (i = 0; i < dlc; i++)
 309                 priv->write_reg(priv, dreg++, cf->data[i]);
 310
 311         can_put_echo_skb(skb, dev, 0);
 312
 313         sja1000_write_cmdreg(priv, CMD_TR);
 314
 315         return NETDEV_TX_OK;
 316 }
 317
 318 static void sja1000_rx(struct net_device *dev)
 319 {
 320         struct sja1000_priv *priv = netdev_priv(dev);
 321         struct net_device_stats *stats = &dev->stats;
 322         struct can_frame *cf;
 323         struct sk_buff *skb;
 324         uint8_t fi;
 325         uint8_t dreg;
 326         canid_t id;
 327         int i;
 328
 329         /* create zero'ed CAN frame buffer */
 330         skb = alloc_can_skb(dev, &cf);
 331         if (skb == NULL)
 332                 return;
 333
 334         fi = priv->read_reg(priv, REG_FI);
 335
 336         if (fi & FI_FF) {
 337                 /* extended frame format (EFF) */
 338                 dreg = EFF_BUF;
 339                 id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
 340                     | (priv->read_reg(priv, REG_ID2) << (5 + 8))
 341                     | (priv->read_reg(priv, REG_ID3) << 5)
 342                     | (priv->read_reg(priv, REG_ID4) >> 3);
 343                 id |= CAN_EFF_FLAG;
 344         } else {
 345                 /* standard frame format (SFF) */
 346                 dreg = SFF_BUF;
 347                 id = (priv->read_reg(priv, REG_ID1) << 3)
 348                     | (priv->read_reg(priv, REG_ID2) >> 5);
 349         }
 350
 351         cf->can_dlc = get_can_dlc(fi & 0x0F);
 352         if (fi & FI_RTR) {
 353                 id |= CAN_RTR_FLAG;
 354         } else {
 355                 for (i = 0; i < cf->can_dlc; i++)
 356                         cf->data[i] = priv->read_reg(priv, dreg++);
 357         }
 358
 359         cf->can_id = id;
 360
 361         /* release receive buffer */
 362         sja1000_write_cmdreg(priv, CMD_RRB);
 363
 364         netif_rx(skb);
 365
 366         stats->rx_packets++;
 367         stats->rx_bytes += cf->can_dlc;
 368 }
 369
 370 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 371 {
 372         struct sja1000_priv *priv = netdev_priv(dev);
 373         struct net_device_stats *stats = &dev->stats;
 374         struct can_frame *cf;
 375         struct sk_buff *skb;
 376         enum can_state state = priv->can.state;
 377         uint8_t ecc, alc;
 378
 379         skb = alloc_can_err_skb(dev, &cf);
 380         if (skb == NULL)
 381                 return -ENOMEM;
 382
 383         if (isrc & IRQ_DOI) {
 384                 /* data overrun interrupt */
 385                 netdev_dbg(dev, "data overrun interrupt\n");
 386                 cf->can_id |= CAN_ERR_CRTL;
 387                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 388                 stats->rx_over_errors++;
 389                 stats->rx_errors++;
 390                 sja1000_write_cmdreg(priv, CMD_CDO);    /* clear bit */
 391         }
 392
 393         if (isrc & IRQ_EI) {
 394                 /* error warning interrupt */
 395                 netdev_dbg(dev, "error warning interrupt\n");
 396
 397                 if (status & SR_BS) {
 398                         state = CAN_STATE_BUS_OFF;
 399                         cf->can_id |= CAN_ERR_BUSOFF;
 400                         can_bus_off(dev);
 401                 } else if (status & SR_ES) {
 402                         state = CAN_STATE_ERROR_WARNING;
 403                 } else
 404                         state = CAN_STATE_ERROR_ACTIVE;
 405         }
 406         if (isrc & IRQ_BEI) {
 407                 /* bus error interrupt */
 408                 priv->can.can_stats.bus_error++;
 409                 stats->rx_errors++;
 410
 411                 ecc = priv->read_reg(priv, REG_ECC);
 412
 413                 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 414
 415                 switch (ecc & ECC_MASK) {
 416                 case ECC_BIT:
 417                         cf->data[2] |= CAN_ERR_PROT_BIT;
 418                         break;
 419                 case ECC_FORM:
 420                         cf->data[2] |= CAN_ERR_PROT_FORM;
 421                         break;
 422                 case ECC_STUFF:
 423                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 424                         break;
 425                 default:
 426                         cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 427                         cf->data[3] = ecc & ECC_SEG;
 428                         break;
 429                 }
 430                 /* Error occurred during transmission? */
 431                 if ((ecc & ECC_DIR) == 0)
 432                         cf->data[2] |= CAN_ERR_PROT_TX;
 433         }
 434         if (isrc & IRQ_EPI) {
 435                 /* error passive interrupt */
 436                 netdev_dbg(dev, "error passive interrupt\n");
 437                 if (status & SR_ES)
 438                         state = CAN_STATE_ERROR_PASSIVE;
 439                 else
 440                         state = CAN_STATE_ERROR_ACTIVE;
 441         }
 442         if (isrc & IRQ_ALI) {
 443                 /* arbitration lost interrupt */
 444                 netdev_dbg(dev, "arbitration lost interrupt\n");
 445                 alc = priv->read_reg(priv, REG_ALC);
 446                 priv->can.can_stats.arbitration_lost++;
 447                 stats->tx_errors++;
 448                 cf->can_id |= CAN_ERR_LOSTARB;
 449                 cf->data[0] = alc & 0x1f;
 450         }
 451
 452         if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
 453                                          state == CAN_STATE_ERROR_PASSIVE)) {
 454                 uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
 455                 uint8_t txerr = priv->read_reg(priv, REG_TXERR);
 456                 cf->can_id |= CAN_ERR_CRTL;
 457                 if (state == CAN_STATE_ERROR_WARNING) {
 458                         priv->can.can_stats.error_warning++;
 459                         cf->data[1] = (txerr > rxerr) ?
 460                                 CAN_ERR_CRTL_TX_WARNING :
 461                                 CAN_ERR_CRTL_RX_WARNING;
 462                 } else {
 463                         priv->can.can_stats.error_passive++;
 464                         cf->data[1] = (txerr > rxerr) ?
 465                                 CAN_ERR_CRTL_TX_PASSIVE :
 466                                 CAN_ERR_CRTL_RX_PASSIVE;
 467                 }
 468                 cf->data[6] = txerr;
 469                 cf->data[7] = rxerr;
 470         }
 471
 472         priv->can.state = state;
 473
 474         netif_rx(skb);
 475
 476         stats->rx_packets++;
 477         stats->rx_bytes += cf->can_dlc;
 478
 479         return 0;
 480 }
 481
 482 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 483 {
 484         struct net_device *dev = (struct net_device *)dev_id;
 485         struct sja1000_priv *priv = netdev_priv(dev);
 486         struct net_device_stats *stats = &dev->stats;
 487         uint8_t isrc, status;
 488         int n = 0;
 489
 490         /* Shared interrupts and IRQ off? */
 491         if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
 492                 return IRQ_NONE;
 493
 494         if (priv->pre_irq)
 495                 priv->pre_irq(priv);
 496
 497         while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
 498                 n++;
 499                 status = priv->read_reg(priv, REG_SR);
 500                 /* check for absent controller due to hw unplug */
 501                 if (status == 0xFF && sja1000_is_absent(priv))
 502                         return IRQ_NONE;
 503
 504                 if (isrc & IRQ_WUI)
 505                         netdev_warn(dev, "wakeup interrupt\n");
 506
 507                 if (isrc & IRQ_TI) {
 508                         /* transmission complete interrupt */
 509                         stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf;
 510                         stats->tx_packets++;
 511                         can_get_echo_skb(dev, 0);
 512                         netif_wake_queue(dev);
 513                 }
 514                 if (isrc & IRQ_RI) {
 515                         /* receive interrupt */
 516                         while (status & SR_RBS) {
 517                                 sja1000_rx(dev);
 518                                 status = priv->read_reg(priv, REG_SR);
 519                                 /* check for absent controller */
 520                                 if (status == 0xFF && sja1000_is_absent(priv))
 521                                         return IRQ_NONE;
 522                         }
 523                 }
 524                 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
 525                         /* error interrupt */
 526                         if (sja1000_err(dev, isrc, status))
 527                                 break;
 528                 }
 529         }
 530
 531         if (priv->post_irq)
 532                 priv->post_irq(priv);
 533
 534         if (n >= SJA1000_MAX_IRQ)
 535                 netdev_dbg(dev, "%d messages handled in ISR", n);
 536
 537         return (n) ? IRQ_HANDLED : IRQ_NONE;
 538 }
 539 EXPORT_SYMBOL_GPL(sja1000_interrupt);
 540
 541 static int sja1000_open(struct net_device *dev)
 542 {
 543         struct sja1000_priv *priv = netdev_priv(dev);
 544         int err;
 545
 546         /* set chip into reset mode */
 547         set_reset_mode(dev);
 548
 549         /* common open */
 550         err = open_candev(dev);
 551         if (err)
 552                 return err;
 553
 554         /* register interrupt handler, if not done by the device driver */
 555         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
 556                 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
 557                                   dev->name, (void *)dev);
 558                 if (err) {
 559                         close_candev(dev);
 560                         return -EAGAIN;
 561                 }
 562         }
 563
 564         /* init and start chi */
 565         sja1000_start(dev);
 566         priv->open_time = jiffies;
 567
 568         netif_start_queue(dev);
 569
 570         return 0;
 571 }
 572
 573 static int sja1000_close(struct net_device *dev)
 574 {
 575         struct sja1000_priv *priv = netdev_priv(dev);
 576
 577         netif_stop_queue(dev);
 578         set_reset_mode(dev);
 579
 580         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
 581                 free_irq(dev->irq, (void *)dev);
 582
 583         close_candev(dev);
 584
 585         priv->open_time = 0;
 586
 587         return 0;
 588 }
 589
 590 struct net_device *alloc_sja1000dev(int sizeof_priv)
 591 {
 592         struct net_device *dev;
 593         struct sja1000_priv *priv;
 594
 595         dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
 596                 SJA1000_ECHO_SKB_MAX);
 597         if (!dev)
 598                 return NULL;
 599
 600         priv = netdev_priv(dev);
 601
 602         priv->dev = dev;
 603         priv->can.bittiming_const = &sja1000_bittiming_const;
 604         priv->can.do_set_bittiming = sja1000_set_bittiming;
 605         priv->can.do_set_mode = sja1000_set_mode;
 606         priv->can.do_get_berr_counter = sja1000_get_berr_counter;
 607         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
 608                 CAN_CTRLMODE_BERR_REPORTING;
 609
 610         spin_lock_init(&priv->cmdreg_lock);
 611
 612         if (sizeof_priv)
 613                 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
 614
 615         return dev;
 616 }
 617 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
 618
 619 void free_sja1000dev(struct net_device *dev)
 620 {
 621         free_candev(dev);
 622 }
 623 EXPORT_SYMBOL_GPL(free_sja1000dev);
 624
 625 static const struct net_device_ops sja1000_netdev_ops = {
 626        .ndo_open               = sja1000_open,
 627        .ndo_stop               = sja1000_close,
 628        .ndo_start_xmit         = sja1000_start_xmit,
 629 };
 630
 631 int register_sja1000dev(struct net_device *dev)
 632 {
 633         if (!sja1000_probe_chip(dev))
 634                 return -ENODEV;
 635
 636         dev->flags |= IFF_ECHO; /* we support local echo */
 637         dev->netdev_ops = &sja1000_netdev_ops;
 638
 639         set_reset_mode(dev);
 640         chipset_init(dev);
 641
 642         return register_candev(dev);
 643 }
 644 EXPORT_SYMBOL_GPL(register_sja1000dev);
 645
 646 void unregister_sja1000dev(struct net_device *dev)
 647 {
 648         set_reset_mode(dev);
 649         unregister_candev(dev);
 650 }
 651 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
 652
 653 static __init int sja1000_init(void)
 654 {
 655         printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
 656
 657         return 0;
 658 }
 659
 660 module_init(sja1000_init);
 661
 662 static __exit void sja1000_exit(void)
 663 {
 664         printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
 665 }
 666
 667 module_exit(sja1000_exit);