kernel/2.6/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  * Send feedback to <socketcan-users@lists.berlios.de>
  44  *
  45  */
  46
  47 #include <linux/module.h>
  48 #include <linux/init.h>
  49 #include <linux/kernel.h>
  50 #include <linux/version.h>
  51 #include <linux/sched.h>
  52 #include <linux/types.h>
  53 #include <linux/fcntl.h>
  54 #include <linux/interrupt.h>
  55 #include <linux/ptrace.h>
  56 #include <linux/string.h>
  57 #include <linux/errno.h>
  58 #include <linux/netdevice.h>
  59 #include <linux/if_arp.h>
  60 #include <linux/if_ether.h>
  61 #include <linux/skbuff.h>
  62 #include <linux/delay.h>
  63
  64 #include <socketcan/can.h>
  65 #include <socketcan/can/dev.h>
  66 #include <socketcan/can/error.h>
  67
  68 #include "sja1000.h"
  69
  70 #include <socketcan/can/version.h>      /* for RCSID. Removed by mkpatch script */
  71 RCSID("$Id: sja1000.c 531 2007-10-19 07:38:29Z hartkopp $");
  72
  73 #define DRV_NAME "sja1000"
  74
  75 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
  76 MODULE_LICENSE("Dual BSD/GPL");
  77 MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
  78
  79 static struct can_bittiming_const sja1000_bittiming_const = {
  80         .name = DRV_NAME,
  81         .tseg1_min = 1,
  82         .tseg1_max = 16,
  83         .tseg2_min = 1,
  84         .tseg2_max = 8,
  85         .sjw_max = 4,
  86         .brp_min = 1,
  87         .brp_max = 64,
  88         .brp_inc = 1,
  89 };
  90
  91 static void sja1000_write_cmdreg(struct sja1000_priv *priv, u8 val)
  92 {
  93         unsigned long flags;
  94
  95         /*
  96          * The command register needs some locking and time to settle
  97          * the write_reg() operation - especially on SMP systems.
  98          */
  99         spin_lock_irqsave(&priv->cmdreg_lock, flags);
 100         priv->write_reg(priv, REG_CMR, val);
 101         priv->read_reg(priv, REG_SR);
 102         spin_unlock_irqrestore(&priv->cmdreg_lock, flags);
 103 }
 104
 105 static int sja1000_probe_chip(struct net_device *dev)
 106 {
 107         struct sja1000_priv *priv = netdev_priv(dev);
 108
 109         if (priv->reg_base && (priv->read_reg(priv, 0) == 0xFF)) {
 110                 dev_info(ND2D(dev), "probing @0x%p failed\n",
 111                          priv->reg_base);
 112                 return 0;
 113         }
 114         return -1;
 115 }
 116
 117 static void set_reset_mode(struct net_device *dev)
 118 {
 119         struct sja1000_priv *priv = netdev_priv(dev);
 120         unsigned char status = priv->read_reg(priv, REG_MOD);
 121         int i;
 122
 123         /* disable interrupts */
 124         priv->write_reg(priv, REG_IER, IRQ_OFF);
 125
 126         for (i = 0; i < 100; i++) {
 127                 /* check reset bit */
 128                 if (status & MOD_RM) {
 129                         priv->can.state = CAN_STATE_STOPPED;
 130                         return;
 131                 }
 132
 133                 priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */
 134                 udelay(10);
 135                 status = priv->read_reg(priv, REG_MOD);
 136         }
 137
 138         dev_err(ND2D(dev), "setting SJA1000 into reset mode failed!\n");
 139 }
 140
 141 static void set_normal_mode(struct net_device *dev)
 142 {
 143         struct sja1000_priv *priv = netdev_priv(dev);
 144         unsigned char status = priv->read_reg(priv, REG_MOD);
 145         int i;
 146
 147         for (i = 0; i < 100; i++) {
 148                 /* check reset bit */
 149                 if ((status & MOD_RM) == 0) {
 150                         priv->can.state = CAN_STATE_ERROR_ACTIVE;
 151                         /* enable interrupts */
 152                         if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
 153                                 priv->write_reg(priv, REG_IER, IRQ_ALL);
 154                         else
 155                                 priv->write_reg(priv, REG_IER,
 156                                                 IRQ_ALL & ~IRQ_BEI);
 157                         return;
 158                 }
 159
 160                 /* set chip to normal mode */
 161                 priv->write_reg(priv, REG_MOD, 0x00);
 162                 udelay(10);
 163                 status = priv->read_reg(priv, REG_MOD);
 164         }
 165
 166         dev_err(ND2D(dev), "setting SJA1000 into normal mode failed!\n");
 167 }
 168
 169 static void sja1000_start(struct net_device *dev)
 170 {
 171         struct sja1000_priv *priv = netdev_priv(dev);
 172
 173         /* leave reset mode */
 174         if (priv->can.state != CAN_STATE_STOPPED)
 175                 set_reset_mode(dev);
 176
 177         /* Clear error counters and error code capture */
 178         priv->write_reg(priv, REG_TXERR, 0x0);
 179         priv->write_reg(priv, REG_RXERR, 0x0);
 180         priv->read_reg(priv, REG_ECC);
 181
 182         /* leave reset mode */
 183         set_normal_mode(dev);
 184 }
 185
 186 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
 187 {
 188         struct sja1000_priv *priv = netdev_priv(dev);
 189
 190         if (!priv->open_time)
 191                 return -EINVAL;
 192
 193         switch (mode) {
 194         case CAN_MODE_START:
 195                 sja1000_start(dev);
 196                 if (netif_queue_stopped(dev))
 197                         netif_wake_queue(dev);
 198                 break;
 199
 200         default:
 201                 return -EOPNOTSUPP;
 202         }
 203
 204         return 0;
 205 }
 206
 207 static int sja1000_set_bittiming(struct net_device *dev)
 208 {
 209         struct sja1000_priv *priv = netdev_priv(dev);
 210         struct can_bittiming *bt = &priv->can.bittiming;
 211         u8 btr0, btr1;
 212
 213         btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
 214         btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
 215                 (((bt->phase_seg2 - 1) & 0x7) << 4);
 216         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
 217                 btr1 |= 0x80;
 218
 219         dev_info(ND2D(dev),
 220                  "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
 221
 222         priv->write_reg(priv, REG_BTR0, btr0);
 223         priv->write_reg(priv, REG_BTR1, btr1);
 224
 225         return 0;
 226 }
 227
 228 static int sja1000_get_berr_counter(const struct net_device *dev,
 229                                     struct can_berr_counter *bec)
 230 {
 231         struct sja1000_priv *priv = netdev_priv(dev);
 232
 233         bec->txerr = priv->read_reg(priv, REG_TXERR);
 234         bec->rxerr = priv->read_reg(priv, REG_RXERR);
 235
 236         return 0;
 237 }
 238
 239 /*
 240  * initialize SJA1000 chip:
 241  *   - reset chip
 242  *   - set output mode
 243  *   - set baudrate
 244  *   - enable interrupts
 245  *   - start operating mode
 246  */
 247 static void chipset_init(struct net_device *dev)
 248 {
 249         struct sja1000_priv *priv = netdev_priv(dev);
 250
 251         /* set clock divider and output control register */
 252         priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN);
 253
 254         /* set acceptance filter (accept all) */
 255         priv->write_reg(priv, REG_ACCC0, 0x00);
 256         priv->write_reg(priv, REG_ACCC1, 0x00);
 257         priv->write_reg(priv, REG_ACCC2, 0x00);
 258         priv->write_reg(priv, REG_ACCC3, 0x00);
 259
 260         priv->write_reg(priv, REG_ACCM0, 0xFF);
 261         priv->write_reg(priv, REG_ACCM1, 0xFF);
 262         priv->write_reg(priv, REG_ACCM2, 0xFF);
 263         priv->write_reg(priv, REG_ACCM3, 0xFF);
 264
 265         priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL);
 266 }
 267
 268 /*
 269  * transmit a CAN message
 270  * message layout in the sk_buff should be like this:
 271  * xx xx xx xx   ff      ll   00 11 22 33 44 55 66 77
 272  * [  can-id ] [flags] [len] [can data (up to 8 bytes]
 273  */
 274 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
 275 static int sja1000_start_xmit(struct sk_buff *skb, struct net_device *dev)
 276 #else
 277 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
 278                                       struct net_device *dev)
 279 #endif
 280 {
 281         struct sja1000_priv *priv = netdev_priv(dev);
 282         struct can_frame *cf = (struct can_frame *)skb->data;
 283         uint8_t fi;
 284         uint8_t dlc;
 285         canid_t id;
 286         uint8_t dreg;
 287         int i;
 288
 289         if (can_dropped_invalid_skb(dev, skb))
 290                 return NETDEV_TX_OK;
 291
 292         netif_stop_queue(dev);
 293
 294         fi = dlc = cf->can_dlc;
 295         id = cf->can_id;
 296
 297         if (id & CAN_RTR_FLAG)
 298                 fi |= FI_RTR;
 299
 300         if (id & CAN_EFF_FLAG) {
 301                 fi |= FI_FF;
 302                 dreg = EFF_BUF;
 303                 priv->write_reg(priv, REG_FI, fi);
 304                 priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
 305                 priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
 306                 priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
 307                 priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
 308         } else {
 309                 dreg = SFF_BUF;
 310                 priv->write_reg(priv, REG_FI, fi);
 311                 priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
 312                 priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
 313         }
 314
 315         for (i = 0; i < dlc; i++)
 316                 priv->write_reg(priv, dreg++, cf->data[i]);
 317
 318         dev->trans_start = jiffies;
 319
 320         can_put_echo_skb(skb, dev, 0);
 321
 322         sja1000_write_cmdreg(priv, CMD_TR);
 323
 324         return NETDEV_TX_OK;
 325 }
 326
 327 static void sja1000_rx(struct net_device *dev)
 328 {
 329         struct sja1000_priv *priv = netdev_priv(dev);
 330 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
 331         struct net_device_stats *stats = can_get_stats(dev);
 332 #else
 333         struct net_device_stats *stats = &dev->stats;
 334 #endif
 335         struct can_frame *cf;
 336         struct sk_buff *skb;
 337         uint8_t fi;
 338         uint8_t dreg;
 339         canid_t id;
 340         int i;
 341
 342         /* create zero'ed CAN frame buffer */
 343         skb = alloc_can_skb(dev, &cf);
 344         if (skb == NULL)
 345                 return;
 346
 347         fi = priv->read_reg(priv, REG_FI);
 348
 349         if (fi & FI_FF) {
 350                 /* extended frame format (EFF) */
 351                 dreg = EFF_BUF;
 352                 id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
 353                     | (priv->read_reg(priv, REG_ID2) << (5 + 8))
 354                     | (priv->read_reg(priv, REG_ID3) << 5)
 355                     | (priv->read_reg(priv, REG_ID4) >> 3);
 356                 id |= CAN_EFF_FLAG;
 357         } else {
 358                 /* standard frame format (SFF) */
 359                 dreg = SFF_BUF;
 360                 id = (priv->read_reg(priv, REG_ID1) << 3)
 361                     | (priv->read_reg(priv, REG_ID2) >> 5);
 362         }
 363
 364         if (fi & FI_RTR) {
 365                 id |= CAN_RTR_FLAG;
 366         } else {
 367                 cf->can_dlc = get_can_dlc(fi & 0x0F);
 368                 for (i = 0; i < cf->can_dlc; i++)
 369                         cf->data[i] = priv->read_reg(priv, dreg++);
 370         }
 371
 372         cf->can_id = id;
 373
 374         /* release receive buffer */
 375         sja1000_write_cmdreg(priv, CMD_RRB);
 376
 377         netif_rx(skb);
 378
 379 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
 380         dev->last_rx = jiffies;
 381 #endif
 382         stats->rx_packets++;
 383         stats->rx_bytes += cf->can_dlc;
 384 }
 385
 386 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 387 {
 388         struct sja1000_priv *priv = netdev_priv(dev);
 389 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
 390         struct net_device_stats *stats = can_get_stats(dev);
 391 #else
 392         struct net_device_stats *stats = &dev->stats;
 393 #endif
 394         struct can_frame *cf;
 395         struct sk_buff *skb;
 396         enum can_state state = priv->can.state;
 397         uint8_t ecc, alc;
 398
 399         skb = alloc_can_err_skb(dev, &cf);
 400         if (skb == NULL)
 401                 return -ENOMEM;
 402
 403         if (isrc & IRQ_DOI) {
 404                 /* data overrun interrupt */
 405                 dev_dbg(ND2D(dev), "data overrun interrupt\n");
 406                 cf->can_id |= CAN_ERR_CRTL;
 407                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 408                 stats->rx_over_errors++;
 409                 stats->rx_errors++;
 410                 sja1000_write_cmdreg(priv, CMD_CDO);    /* clear bit */
 411         }
 412
 413         if (isrc & IRQ_EI) {
 414                 /* error warning interrupt */
 415                 dev_dbg(ND2D(dev), "error warning interrupt\n");
 416
 417                 if (status & SR_BS) {
 418                         state = CAN_STATE_BUS_OFF;
 419                         cf->can_id |= CAN_ERR_BUSOFF;
 420                         can_bus_off(dev);
 421                 } else if (status & SR_ES) {
 422                         state = CAN_STATE_ERROR_WARNING;
 423                 } else
 424                         state = CAN_STATE_ERROR_ACTIVE;
 425         }
 426         if (isrc & IRQ_BEI) {
 427                 /* bus error interrupt */
 428                 priv->can.can_stats.bus_error++;
 429                 stats->rx_errors++;
 430
 431                 ecc = priv->read_reg(priv, REG_ECC);
 432
 433                 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 434
 435                 switch (ecc & ECC_MASK) {
 436                 case ECC_BIT:
 437                         cf->data[2] |= CAN_ERR_PROT_BIT;
 438                         break;
 439                 case ECC_FORM:
 440                         cf->data[2] |= CAN_ERR_PROT_FORM;
 441                         break;
 442                 case ECC_STUFF:
 443                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 444                         break;
 445                 default:
 446                         cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 447                         cf->data[3] = ecc & ECC_SEG;
 448                         break;
 449                 }
 450                 /* Error occurred during transmission? */
 451                 if ((ecc & ECC_DIR) == 0)
 452                         cf->data[2] |= CAN_ERR_PROT_TX;
 453         }
 454         if (isrc & IRQ_EPI) {
 455                 /* error passive interrupt */
 456                 dev_dbg(ND2D(dev), "error passive interrupt\n");
 457                 if (status & SR_ES)
 458                         state = CAN_STATE_ERROR_PASSIVE;
 459                 else
 460                         state = CAN_STATE_ERROR_ACTIVE;
 461         }
 462         if (isrc & IRQ_ALI) {
 463                 /* arbitration lost interrupt */
 464                 dev_dbg(ND2D(dev), "arbitration lost interrupt\n");
 465                 alc = priv->read_reg(priv, REG_ALC);
 466                 priv->can.can_stats.arbitration_lost++;
 467                 stats->tx_errors++;
 468                 cf->can_id |= CAN_ERR_LOSTARB;
 469                 cf->data[0] = alc & 0x1f;
 470         }
 471
 472         if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
 473                                          state == CAN_STATE_ERROR_PASSIVE)) {
 474                 uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
 475                 uint8_t txerr = priv->read_reg(priv, REG_TXERR);
 476                 cf->can_id |= CAN_ERR_CRTL;
 477                 if (state == CAN_STATE_ERROR_WARNING) {
 478                         priv->can.can_stats.error_warning++;
 479                         cf->data[1] = (txerr > rxerr) ?
 480                                 CAN_ERR_CRTL_TX_WARNING :
 481                                 CAN_ERR_CRTL_RX_WARNING;
 482                 } else {
 483                         priv->can.can_stats.error_passive++;
 484                         cf->data[1] = (txerr > rxerr) ?
 485                                 CAN_ERR_CRTL_TX_PASSIVE :
 486                                 CAN_ERR_CRTL_RX_PASSIVE;
 487                 }
 488                 cf->data[6] = txerr;
 489                 cf->data[7] = rxerr;
 490         }
 491
 492         priv->can.state = state;
 493
 494         netif_rx(skb);
 495
 496 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
 497         dev->last_rx = jiffies;
 498 #endif
 499         stats->rx_packets++;
 500         stats->rx_bytes += cf->can_dlc;
 501
 502         return 0;
 503 }
 504
 505 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
 506 irqreturn_t sja1000_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 507 #else
 508 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 509 #endif
 510 {
 511         struct net_device *dev = (struct net_device *)dev_id;
 512         struct sja1000_priv *priv = netdev_priv(dev);
 513 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
 514         struct net_device_stats *stats = can_get_stats(dev);
 515 #else
 516         struct net_device_stats *stats = &dev->stats;
 517 #endif
 518         uint8_t isrc, status;
 519         int n = 0;
 520
 521         /* Shared interrupts and IRQ off? */
 522         if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
 523                 return IRQ_NONE;
 524
 525         if (priv->pre_irq)
 526                 priv->pre_irq(priv);
 527
 528         while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
 529                 n++;
 530                 status = priv->read_reg(priv, REG_SR);
 531
 532                 if (isrc & IRQ_WUI)
 533                         dev_warn(ND2D(dev), "wakeup interrupt\n");
 534
 535                 if (isrc & IRQ_TI) {
 536                         /* transmission complete interrupt */
 537                         stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf;
 538                         stats->tx_packets++;
 539                         can_get_echo_skb(dev, 0);
 540                         netif_wake_queue(dev);
 541                 }
 542                 if (isrc & IRQ_RI) {
 543                         /* receive interrupt */
 544                         while (status & SR_RBS) {
 545                                 sja1000_rx(dev);
 546                                 status = priv->read_reg(priv, REG_SR);
 547                         }
 548                 }
 549                 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
 550                         /* error interrupt */
 551                         if (sja1000_err(dev, isrc, status))
 552                                 break;
 553                 }
 554         }
 555
 556         if (priv->post_irq)
 557                 priv->post_irq(priv);
 558
 559         if (n >= SJA1000_MAX_IRQ)
 560                 dev_dbg(ND2D(dev), "%d messages handled in ISR", n);
 561
 562         return (n) ? IRQ_HANDLED : IRQ_NONE;
 563 }
 564 EXPORT_SYMBOL_GPL(sja1000_interrupt);
 565
 566 static int sja1000_open(struct net_device *dev)
 567 {
 568         struct sja1000_priv *priv = netdev_priv(dev);
 569         int err;
 570
 571         /* set chip into reset mode */
 572         set_reset_mode(dev);
 573
 574         /* common open */
 575         err = open_candev(dev);
 576         if (err)
 577                 return err;
 578
 579         /* register interrupt handler, if not done by the device driver */
 580         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
 581                 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
 582                                   dev->name, (void *)dev);
 583                 if (err) {
 584                         close_candev(dev);
 585                         return -EAGAIN;
 586                 }
 587         }
 588
 589 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
 590         /* clear statistics */
 591         memset(&priv->can.net_stats, 0, sizeof(priv->can.net_stats));
 592 #endif
 593
 594         /* init and start chi */
 595         sja1000_start(dev);
 596         priv->open_time = jiffies;
 597
 598         netif_start_queue(dev);
 599
 600         return 0;
 601 }
 602
 603 static int sja1000_close(struct net_device *dev)
 604 {
 605         struct sja1000_priv *priv = netdev_priv(dev);
 606
 607         netif_stop_queue(dev);
 608         set_reset_mode(dev);
 609
 610         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
 611                 free_irq(dev->irq, (void *)dev);
 612
 613         close_candev(dev);
 614
 615         priv->open_time = 0;
 616
 617         return 0;
 618 }
 619
 620 struct net_device *alloc_sja1000dev(int sizeof_priv)
 621 {
 622         struct net_device *dev;
 623         struct sja1000_priv *priv;
 624
 625         dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
 626                 SJA1000_ECHO_SKB_MAX);
 627         if (!dev)
 628                 return NULL;
 629
 630         priv = netdev_priv(dev);
 631
 632         priv->dev = dev;
 633         priv->can.bittiming_const = &sja1000_bittiming_const;
 634         priv->can.do_set_bittiming = sja1000_set_bittiming;
 635         priv->can.do_set_mode = sja1000_set_mode;
 636         priv->can.do_get_berr_counter = sja1000_get_berr_counter;
 637         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
 638                 CAN_CTRLMODE_BERR_REPORTING;
 639
 640         spin_lock_init(&priv->cmdreg_lock);
 641
 642         if (sizeof_priv)
 643                 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
 644
 645         return dev;
 646 }
 647 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
 648
 649 void free_sja1000dev(struct net_device *dev)
 650 {
 651         free_candev(dev);
 652 }
 653 EXPORT_SYMBOL_GPL(free_sja1000dev);
 654
 655 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,28)
 656 static const struct net_device_ops sja1000_netdev_ops = {
 657         .ndo_open = sja1000_open,
 658         .ndo_stop = sja1000_close,
 659         .ndo_start_xmit = sja1000_start_xmit,
 660 };
 661 #endif
 662
 663 int register_sja1000dev(struct net_device *dev)
 664 {
 665         if (!sja1000_probe_chip(dev))
 666                 return -ENODEV;
 667
 668         dev->flags |= IFF_ECHO; /* we support local echo */
 669 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,28)
 670         dev->netdev_ops = &sja1000_netdev_ops;
 671 #else
 672         dev->open = sja1000_open;
 673         dev->stop = sja1000_close;
 674         dev->hard_start_xmit = sja1000_start_xmit;
 675 #endif
 676
 677         set_reset_mode(dev);
 678         chipset_init(dev);
 679
 680         return register_candev(dev);
 681 }
 682 EXPORT_SYMBOL_GPL(register_sja1000dev);
 683
 684 void unregister_sja1000dev(struct net_device *dev)
 685 {
 686         set_reset_mode(dev);
 687         unregister_candev(dev);
 688 }
 689 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
 690
 691 static __init int sja1000_init(void)
 692 {
 693         printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
 694
 695         return 0;
 696 }
 697
 698 module_init(sja1000_init);
 699
 700 static __exit void sja1000_exit(void)
 701 {
 702         printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
 703 }
 704
 705 module_exit(sja1000_exit);