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 #include <linux/can/led.h>
  64
  65 #include "sja1000.h"
  66
  67 #define DRV_NAME "sja1000"
  68
  69 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
  70 MODULE_LICENSE("Dual BSD/GPL");
  71 MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
  72
  73 static const struct can_bittiming_const sja1000_bittiming_const = {
  74         .name = DRV_NAME,
  75         .tseg1_min = 1,
  76         .tseg1_max = 16,
  77         .tseg2_min = 1,
  78         .tseg2_max = 8,
  79         .sjw_max = 4,
  80         .brp_min = 1,
  81         .brp_max = 64,
  82         .brp_inc = 1,
  83 };
  84
  85 static void sja1000_write_cmdreg(struct sja1000_priv *priv, u8 val)
  86 {
  87         unsigned long flags;
  88
  89         /*
  90          * The command register needs some locking and time to settle
  91          * the write_reg() operation - especially on SMP systems.
  92          */
  93         spin_lock_irqsave(&priv->cmdreg_lock, flags);
  94         priv->write_reg(priv, SJA1000_CMR, val);
  95         priv->read_reg(priv, SJA1000_SR);
  96         spin_unlock_irqrestore(&priv->cmdreg_lock, flags);
  97 }
  98
  99 static int sja1000_is_absent(struct sja1000_priv *priv)
 100 {
 101         return (priv->read_reg(priv, SJA1000_MOD) == 0xFF);
 102 }
 103
 104 static int sja1000_probe_chip(struct net_device *dev)
 105 {
 106         struct sja1000_priv *priv = netdev_priv(dev);
 107
 108         if (priv->reg_base && sja1000_is_absent(priv)) {
 109                 printk(KERN_INFO "%s: probing @0x%lX failed\n",
 110                        DRV_NAME, dev->base_addr);
 111                 return 0;
 112         }
 113         return -1;
 114 }
 115
 116 static void set_reset_mode(struct net_device *dev)
 117 {
 118         struct sja1000_priv *priv = netdev_priv(dev);
 119         unsigned char status = priv->read_reg(priv, SJA1000_MOD);
 120         int i;
 121
 122         /* disable interrupts */
 123         priv->write_reg(priv, SJA1000_IER, IRQ_OFF);
 124
 125         for (i = 0; i < 100; i++) {
 126                 /* check reset bit */
 127                 if (status & MOD_RM) {
 128                         priv->can.state = CAN_STATE_STOPPED;
 129                         return;
 130                 }
 131
 132                 /* reset chip */
 133                 priv->write_reg(priv, SJA1000_MOD, MOD_RM);
 134                 udelay(10);
 135                 status = priv->read_reg(priv, SJA1000_MOD);
 136         }
 137
 138         netdev_err(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, SJA1000_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, SJA1000_IER, IRQ_ALL);
 154                         else
 155                                 priv->write_reg(priv, SJA1000_IER,
 156                                                 IRQ_ALL & ~IRQ_BEI);
 157                         return;
 158                 }
 159
 160                 /* set chip to normal mode */
 161                 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
 162                         priv->write_reg(priv, SJA1000_MOD, MOD_LOM);
 163                 else
 164                         priv->write_reg(priv, SJA1000_MOD, 0x00);
 165
 166                 udelay(10);
 167
 168                 status = priv->read_reg(priv, SJA1000_MOD);
 169         }
 170
 171         netdev_err(dev, "setting SJA1000 into normal mode failed!\n");
 172 }
 173
 174 static void sja1000_start(struct net_device *dev)
 175 {
 176         struct sja1000_priv *priv = netdev_priv(dev);
 177
 178         /* leave reset mode */
 179         if (priv->can.state != CAN_STATE_STOPPED)
 180                 set_reset_mode(dev);
 181
 182         /* Clear error counters and error code capture */
 183         priv->write_reg(priv, SJA1000_TXERR, 0x0);
 184         priv->write_reg(priv, SJA1000_RXERR, 0x0);
 185         priv->read_reg(priv, SJA1000_ECC);
 186
 187         /* leave reset mode */
 188         set_normal_mode(dev);
 189 }
 190
 191 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
 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         netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
 220
 221         priv->write_reg(priv, SJA1000_BTR0, btr0);
 222         priv->write_reg(priv, SJA1000_BTR1, btr1);
 223
 224         return 0;
 225 }
 226
 227 static int sja1000_get_berr_counter(const struct net_device *dev,
 228                                     struct can_berr_counter *bec)
 229 {
 230         struct sja1000_priv *priv = netdev_priv(dev);
 231
 232         bec->txerr = priv->read_reg(priv, SJA1000_TXERR);
 233         bec->rxerr = priv->read_reg(priv, SJA1000_RXERR);
 234
 235         return 0;
 236 }
 237
 238 /*
 239  * initialize SJA1000 chip:
 240  *   - reset chip
 241  *   - set output mode
 242  *   - set baudrate
 243  *   - enable interrupts
 244  *   - start operating mode
 245  */
 246 static void chipset_init(struct net_device *dev)
 247 {
 248         struct sja1000_priv *priv = netdev_priv(dev);
 249
 250         /* set clock divider and output control register */
 251         priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN);
 252
 253         /* set acceptance filter (accept all) */
 254         priv->write_reg(priv, SJA1000_ACCC0, 0x00);
 255         priv->write_reg(priv, SJA1000_ACCC1, 0x00);
 256         priv->write_reg(priv, SJA1000_ACCC2, 0x00);
 257         priv->write_reg(priv, SJA1000_ACCC3, 0x00);
 258
 259         priv->write_reg(priv, SJA1000_ACCM0, 0xFF);
 260         priv->write_reg(priv, SJA1000_ACCM1, 0xFF);
 261         priv->write_reg(priv, SJA1000_ACCM2, 0xFF);
 262         priv->write_reg(priv, SJA1000_ACCM3, 0xFF);
 263
 264         priv->write_reg(priv, SJA1000_OCR, priv->ocr | OCR_MODE_NORMAL);
 265 }
 266
 267 /*
 268  * transmit a CAN message
 269  * message layout in the sk_buff should be like this:
 270  * xx xx xx xx   ff      ll   00 11 22 33 44 55 66 77
 271  * [  can-id ] [flags] [len] [can data (up to 8 bytes]
 272  */
 273 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
 274                                             struct net_device *dev)
 275 {
 276         struct sja1000_priv *priv = netdev_priv(dev);
 277         struct can_frame *cf = (struct can_frame *)skb->data;
 278         uint8_t fi;
 279         uint8_t dlc;
 280         canid_t id;
 281         uint8_t dreg;
 282         int i;
 283
 284         if (can_dropped_invalid_skb(dev, skb))
 285                 return NETDEV_TX_OK;
 286
 287         netif_stop_queue(dev);
 288
 289         fi = dlc = cf->can_dlc;
 290         id = cf->can_id;
 291
 292         if (id & CAN_RTR_FLAG)
 293                 fi |= SJA1000_FI_RTR;
 294
 295         if (id & CAN_EFF_FLAG) {
 296                 fi |= SJA1000_FI_FF;
 297                 dreg = SJA1000_EFF_BUF;
 298                 priv->write_reg(priv, SJA1000_FI, fi);
 299                 priv->write_reg(priv, SJA1000_ID1, (id & 0x1fe00000) >> 21);
 300                 priv->write_reg(priv, SJA1000_ID2, (id & 0x001fe000) >> 13);
 301                 priv->write_reg(priv, SJA1000_ID3, (id & 0x00001fe0) >> 5);
 302                 priv->write_reg(priv, SJA1000_ID4, (id & 0x0000001f) << 3);
 303         } else {
 304                 dreg = SJA1000_SFF_BUF;
 305                 priv->write_reg(priv, SJA1000_FI, fi);
 306                 priv->write_reg(priv, SJA1000_ID1, (id & 0x000007f8) >> 3);
 307                 priv->write_reg(priv, SJA1000_ID2, (id & 0x00000007) << 5);
 308         }
 309
 310         for (i = 0; i < dlc; i++)
 311                 priv->write_reg(priv, dreg++, cf->data[i]);
 312
 313         can_put_echo_skb(skb, dev, 0);
 314
 315         if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
 316                 sja1000_write_cmdreg(priv, CMD_TR | CMD_AT);
 317         else
 318                 sja1000_write_cmdreg(priv, CMD_TR);
 319
 320         return NETDEV_TX_OK;
 321 }
 322
 323 static void sja1000_rx(struct net_device *dev)
 324 {
 325         struct sja1000_priv *priv = netdev_priv(dev);
 326         struct net_device_stats *stats = &dev->stats;
 327         struct can_frame *cf;
 328         struct sk_buff *skb;
 329         uint8_t fi;
 330         uint8_t dreg;
 331         canid_t id;
 332         int i;
 333
 334         /* create zero'ed CAN frame buffer */
 335         skb = alloc_can_skb(dev, &cf);
 336         if (skb == NULL)
 337                 return;
 338
 339         fi = priv->read_reg(priv, SJA1000_FI);
 340
 341         if (fi & SJA1000_FI_FF) {
 342                 /* extended frame format (EFF) */
 343                 dreg = SJA1000_EFF_BUF;
 344                 id = (priv->read_reg(priv, SJA1000_ID1) << 21)
 345                     | (priv->read_reg(priv, SJA1000_ID2) << 13)
 346                     | (priv->read_reg(priv, SJA1000_ID3) << 5)
 347                     | (priv->read_reg(priv, SJA1000_ID4) >> 3);
 348                 id |= CAN_EFF_FLAG;
 349         } else {
 350                 /* standard frame format (SFF) */
 351                 dreg = SJA1000_SFF_BUF;
 352                 id = (priv->read_reg(priv, SJA1000_ID1) << 3)
 353                     | (priv->read_reg(priv, SJA1000_ID2) >> 5);
 354         }
 355
 356         cf->can_dlc = get_can_dlc(fi & 0x0F);
 357         if (fi & SJA1000_FI_RTR) {
 358                 id |= CAN_RTR_FLAG;
 359         } else {
 360                 for (i = 0; i < cf->can_dlc; i++)
 361                         cf->data[i] = priv->read_reg(priv, dreg++);
 362         }
 363
 364         cf->can_id = id;
 365
 366         /* release receive buffer */
 367         sja1000_write_cmdreg(priv, CMD_RRB);
 368
 369         netif_rx(skb);
 370
 371         stats->rx_packets++;
 372         stats->rx_bytes += cf->can_dlc;
 373
 374         can_led_event(dev, CAN_LED_EVENT_RX);
 375 }
 376
 377 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 378 {
 379         struct sja1000_priv *priv = netdev_priv(dev);
 380         struct net_device_stats *stats = &dev->stats;
 381         struct can_frame *cf;
 382         struct sk_buff *skb;
 383         enum can_state state = priv->can.state;
 384         uint8_t ecc, alc;
 385
 386         skb = alloc_can_err_skb(dev, &cf);
 387         if (skb == NULL)
 388                 return -ENOMEM;
 389
 390         if (isrc & IRQ_DOI) {
 391                 /* data overrun interrupt */
 392                 netdev_dbg(dev, "data overrun interrupt\n");
 393                 cf->can_id |= CAN_ERR_CRTL;
 394                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 395                 stats->rx_over_errors++;
 396                 stats->rx_errors++;
 397                 sja1000_write_cmdreg(priv, CMD_CDO);    /* clear bit */
 398         }
 399
 400         if (isrc & IRQ_EI) {
 401                 /* error warning interrupt */
 402                 netdev_dbg(dev, "error warning interrupt\n");
 403
 404                 if (status & SR_BS) {
 405                         state = CAN_STATE_BUS_OFF;
 406                         cf->can_id |= CAN_ERR_BUSOFF;
 407                         can_bus_off(dev);
 408                 } else if (status & SR_ES) {
 409                         state = CAN_STATE_ERROR_WARNING;
 410                 } else
 411                         state = CAN_STATE_ERROR_ACTIVE;
 412         }
 413         if (isrc & IRQ_BEI) {
 414                 /* bus error interrupt */
 415                 priv->can.can_stats.bus_error++;
 416                 stats->rx_errors++;
 417
 418                 ecc = priv->read_reg(priv, SJA1000_ECC);
 419
 420                 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 421
 422                 switch (ecc & ECC_MASK) {
 423                 case ECC_BIT:
 424                         cf->data[2] |= CAN_ERR_PROT_BIT;
 425                         break;
 426                 case ECC_FORM:
 427                         cf->data[2] |= CAN_ERR_PROT_FORM;
 428                         break;
 429                 case ECC_STUFF:
 430                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 431                         break;
 432                 default:
 433                         cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 434                         cf->data[3] = ecc & ECC_SEG;
 435                         break;
 436                 }
 437                 /* Error occurred during transmission? */
 438                 if ((ecc & ECC_DIR) == 0)
 439                         cf->data[2] |= CAN_ERR_PROT_TX;
 440         }
 441         if (isrc & IRQ_EPI) {
 442                 /* error passive interrupt */
 443                 netdev_dbg(dev, "error passive interrupt\n");
 444                 if (status & SR_ES)
 445                         state = CAN_STATE_ERROR_PASSIVE;
 446                 else
 447                         state = CAN_STATE_ERROR_ACTIVE;
 448         }
 449         if (isrc & IRQ_ALI) {
 450                 /* arbitration lost interrupt */
 451                 netdev_dbg(dev, "arbitration lost interrupt\n");
 452                 alc = priv->read_reg(priv, SJA1000_ALC);
 453                 priv->can.can_stats.arbitration_lost++;
 454                 stats->tx_errors++;
 455                 cf->can_id |= CAN_ERR_LOSTARB;
 456                 cf->data[0] = alc & 0x1f;
 457         }
 458
 459         if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
 460                                          state == CAN_STATE_ERROR_PASSIVE)) {
 461                 uint8_t rxerr = priv->read_reg(priv, SJA1000_RXERR);
 462                 uint8_t txerr = priv->read_reg(priv, SJA1000_TXERR);
 463                 cf->can_id |= CAN_ERR_CRTL;
 464                 if (state == CAN_STATE_ERROR_WARNING) {
 465                         priv->can.can_stats.error_warning++;
 466                         cf->data[1] = (txerr > rxerr) ?
 467                                 CAN_ERR_CRTL_TX_WARNING :
 468                                 CAN_ERR_CRTL_RX_WARNING;
 469                 } else {
 470                         priv->can.can_stats.error_passive++;
 471                         cf->data[1] = (txerr > rxerr) ?
 472                                 CAN_ERR_CRTL_TX_PASSIVE :
 473                                 CAN_ERR_CRTL_RX_PASSIVE;
 474                 }
 475                 cf->data[6] = txerr;
 476                 cf->data[7] = rxerr;
 477         }
 478
 479         priv->can.state = state;
 480
 481         netif_rx(skb);
 482
 483         stats->rx_packets++;
 484         stats->rx_bytes += cf->can_dlc;
 485
 486         return 0;
 487 }
 488
 489 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 490 {
 491         struct net_device *dev = (struct net_device *)dev_id;
 492         struct sja1000_priv *priv = netdev_priv(dev);
 493         struct net_device_stats *stats = &dev->stats;
 494         uint8_t isrc, status;
 495         int n = 0;
 496
 497         if (priv->pre_irq)
 498                 priv->pre_irq(priv);
 499
 500         /* Shared interrupts and IRQ off? */
 501         if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF)
 502                 goto out;
 503
 504         while ((isrc = priv->read_reg(priv, SJA1000_IR)) &&
 505                (n < SJA1000_MAX_IRQ)) {
 506
 507                 status = priv->read_reg(priv, SJA1000_SR);
 508                 /* check for absent controller due to hw unplug */
 509                 if (status == 0xFF && sja1000_is_absent(priv))
 510                         goto out;
 511
 512                 if (isrc & IRQ_WUI)
 513                         netdev_warn(dev, "wakeup interrupt\n");
 514
 515                 if (isrc & IRQ_TI) {
 516                         /* transmission buffer released */
 517                         if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT &&
 518                             !(status & SR_TCS)) {
 519                                 stats->tx_errors++;
 520                                 can_free_echo_skb(dev, 0);
 521                         } else {
 522                                 /* transmission complete */
 523                                 stats->tx_bytes +=
 524                                         priv->read_reg(priv, SJA1000_FI) & 0xf;
 525                                 stats->tx_packets++;
 526                                 can_get_echo_skb(dev, 0);
 527                         }
 528                         netif_wake_queue(dev);
 529                         can_led_event(dev, CAN_LED_EVENT_TX);
 530                 }
 531                 if (isrc & IRQ_RI) {
 532                         /* receive interrupt */
 533                         while (status & SR_RBS) {
 534                                 sja1000_rx(dev);
 535                                 status = priv->read_reg(priv, SJA1000_SR);
 536                                 /* check for absent controller */
 537                                 if (status == 0xFF && sja1000_is_absent(priv))
 538                                         goto out;
 539                         }
 540                 }
 541                 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
 542                         /* error interrupt */
 543                         if (sja1000_err(dev, isrc, status))
 544                                 break;
 545                 }
 546                 n++;
 547         }
 548 out:
 549         if (priv->post_irq)
 550                 priv->post_irq(priv);
 551
 552         if (n >= SJA1000_MAX_IRQ)
 553                 netdev_dbg(dev, "%d messages handled in ISR", n);
 554
 555         return (n) ? IRQ_HANDLED : IRQ_NONE;
 556 }
 557 EXPORT_SYMBOL_GPL(sja1000_interrupt);
 558
 559 static int sja1000_open(struct net_device *dev)
 560 {
 561         struct sja1000_priv *priv = netdev_priv(dev);
 562         int err;
 563
 564         /* set chip into reset mode */
 565         set_reset_mode(dev);
 566
 567         /* common open */
 568         err = open_candev(dev);
 569         if (err)
 570                 return err;
 571
 572         /* register interrupt handler, if not done by the device driver */
 573         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
 574                 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
 575                                   dev->name, (void *)dev);
 576                 if (err) {
 577                         close_candev(dev);
 578                         return -EAGAIN;
 579                 }
 580         }
 581
 582         /* init and start chi */
 583         sja1000_start(dev);
 584
 585         can_led_event(dev, CAN_LED_EVENT_OPEN);
 586
 587         netif_start_queue(dev);
 588
 589         return 0;
 590 }
 591
 592 static int sja1000_close(struct net_device *dev)
 593 {
 594         struct sja1000_priv *priv = netdev_priv(dev);
 595
 596         netif_stop_queue(dev);
 597         set_reset_mode(dev);
 598
 599         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
 600                 free_irq(dev->irq, (void *)dev);
 601
 602         close_candev(dev);
 603
 604         can_led_event(dev, CAN_LED_EVENT_STOP);
 605
 606         return 0;
 607 }
 608
 609 struct net_device *alloc_sja1000dev(int sizeof_priv)
 610 {
 611         struct net_device *dev;
 612         struct sja1000_priv *priv;
 613
 614         dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
 615                 SJA1000_ECHO_SKB_MAX);
 616         if (!dev)
 617                 return NULL;
 618
 619         priv = netdev_priv(dev);
 620
 621         priv->dev = dev;
 622         priv->can.bittiming_const = &sja1000_bittiming_const;
 623         priv->can.do_set_bittiming = sja1000_set_bittiming;
 624         priv->can.do_set_mode = sja1000_set_mode;
 625         priv->can.do_get_berr_counter = sja1000_get_berr_counter;
 626         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
 627                 CAN_CTRLMODE_BERR_REPORTING | CAN_CTRLMODE_LISTENONLY |
 628                 CAN_CTRLMODE_ONE_SHOT;
 629
 630         spin_lock_init(&priv->cmdreg_lock);
 631
 632         if (sizeof_priv)
 633                 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
 634
 635         return dev;
 636 }
 637 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
 638
 639 void free_sja1000dev(struct net_device *dev)
 640 {
 641         free_candev(dev);
 642 }
 643 EXPORT_SYMBOL_GPL(free_sja1000dev);
 644
 645 static const struct net_device_ops sja1000_netdev_ops = {
 646        .ndo_open               = sja1000_open,
 647        .ndo_stop               = sja1000_close,
 648        .ndo_start_xmit         = sja1000_start_xmit,
 649 };
 650
 651 int register_sja1000dev(struct net_device *dev)
 652 {
 653         int ret;
 654
 655         if (!sja1000_probe_chip(dev))
 656                 return -ENODEV;
 657
 658         dev->flags |= IFF_ECHO; /* we support local echo */
 659         dev->netdev_ops = &sja1000_netdev_ops;
 660
 661         set_reset_mode(dev);
 662         chipset_init(dev);
 663
 664         ret =  register_candev(dev);
 665
 666         if (!ret)
 667                 devm_can_led_init(dev);
 668
 669         return ret;
 670 }
 671 EXPORT_SYMBOL_GPL(register_sja1000dev);
 672
 673 void unregister_sja1000dev(struct net_device *dev)
 674 {
 675         set_reset_mode(dev);
 676         unregister_candev(dev);
 677 }
 678 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
 679
 680 static __init int sja1000_init(void)
 681 {
 682         printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
 683
 684         return 0;
 685 }
 686
 687 module_init(sja1000_init);
 688
 689 static __exit void sja1000_exit(void)
 690 {
 691         printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
 692 }
 693
 694 module_exit(sja1000_exit);