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         /* clear interrupt flags */
 188         priv->read_reg(priv, SJA1000_IR);
 189
 190         /* leave reset mode */
 191         set_normal_mode(dev);
 192 }
 193
 194 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
 195 {
 196         switch (mode) {
 197         case CAN_MODE_START:
 198                 sja1000_start(dev);
 199                 if (netif_queue_stopped(dev))
 200                         netif_wake_queue(dev);
 201                 break;
 202
 203         default:
 204                 return -EOPNOTSUPP;
 205         }
 206
 207         return 0;
 208 }
 209
 210 static int sja1000_set_bittiming(struct net_device *dev)
 211 {
 212         struct sja1000_priv *priv = netdev_priv(dev);
 213         struct can_bittiming *bt = &priv->can.bittiming;
 214         u8 btr0, btr1;
 215
 216         btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
 217         btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
 218                 (((bt->phase_seg2 - 1) & 0x7) << 4);
 219         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
 220                 btr1 |= 0x80;
 221
 222         netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
 223
 224         priv->write_reg(priv, SJA1000_BTR0, btr0);
 225         priv->write_reg(priv, SJA1000_BTR1, btr1);
 226
 227         return 0;
 228 }
 229
 230 static int sja1000_get_berr_counter(const struct net_device *dev,
 231                                     struct can_berr_counter *bec)
 232 {
 233         struct sja1000_priv *priv = netdev_priv(dev);
 234
 235         bec->txerr = priv->read_reg(priv, SJA1000_TXERR);
 236         bec->rxerr = priv->read_reg(priv, SJA1000_RXERR);
 237
 238         return 0;
 239 }
 240
 241 /*
 242  * initialize SJA1000 chip:
 243  *   - reset chip
 244  *   - set output mode
 245  *   - set baudrate
 246  *   - enable interrupts
 247  *   - start operating mode
 248  */
 249 static void chipset_init(struct net_device *dev)
 250 {
 251         struct sja1000_priv *priv = netdev_priv(dev);
 252
 253         /* set clock divider and output control register */
 254         priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN);
 255
 256         /* set acceptance filter (accept all) */
 257         priv->write_reg(priv, SJA1000_ACCC0, 0x00);
 258         priv->write_reg(priv, SJA1000_ACCC1, 0x00);
 259         priv->write_reg(priv, SJA1000_ACCC2, 0x00);
 260         priv->write_reg(priv, SJA1000_ACCC3, 0x00);
 261
 262         priv->write_reg(priv, SJA1000_ACCM0, 0xFF);
 263         priv->write_reg(priv, SJA1000_ACCM1, 0xFF);
 264         priv->write_reg(priv, SJA1000_ACCM2, 0xFF);
 265         priv->write_reg(priv, SJA1000_ACCM3, 0xFF);
 266
 267         priv->write_reg(priv, SJA1000_OCR, priv->ocr | OCR_MODE_NORMAL);
 268 }
 269
 270 /*
 271  * transmit a CAN message
 272  * message layout in the sk_buff should be like this:
 273  * xx xx xx xx   ff      ll   00 11 22 33 44 55 66 77
 274  * [  can-id ] [flags] [len] [can data (up to 8 bytes]
 275  */
 276 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
 277                                             struct net_device *dev)
 278 {
 279         struct sja1000_priv *priv = netdev_priv(dev);
 280         struct can_frame *cf = (struct can_frame *)skb->data;
 281         uint8_t fi;
 282         uint8_t dlc;
 283         canid_t id;
 284         uint8_t dreg;
 285         int i;
 286
 287         if (can_dropped_invalid_skb(dev, skb))
 288                 return NETDEV_TX_OK;
 289
 290         netif_stop_queue(dev);
 291
 292         fi = dlc = cf->can_dlc;
 293         id = cf->can_id;
 294
 295         if (id & CAN_RTR_FLAG)
 296                 fi |= SJA1000_FI_RTR;
 297
 298         if (id & CAN_EFF_FLAG) {
 299                 fi |= SJA1000_FI_FF;
 300                 dreg = SJA1000_EFF_BUF;
 301                 priv->write_reg(priv, SJA1000_FI, fi);
 302                 priv->write_reg(priv, SJA1000_ID1, (id & 0x1fe00000) >> 21);
 303                 priv->write_reg(priv, SJA1000_ID2, (id & 0x001fe000) >> 13);
 304                 priv->write_reg(priv, SJA1000_ID3, (id & 0x00001fe0) >> 5);
 305                 priv->write_reg(priv, SJA1000_ID4, (id & 0x0000001f) << 3);
 306         } else {
 307                 dreg = SJA1000_SFF_BUF;
 308                 priv->write_reg(priv, SJA1000_FI, fi);
 309                 priv->write_reg(priv, SJA1000_ID1, (id & 0x000007f8) >> 3);
 310                 priv->write_reg(priv, SJA1000_ID2, (id & 0x00000007) << 5);
 311         }
 312
 313         for (i = 0; i < dlc; i++)
 314                 priv->write_reg(priv, dreg++, cf->data[i]);
 315
 316         can_put_echo_skb(skb, dev, 0);
 317
 318         if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
 319                 sja1000_write_cmdreg(priv, CMD_TR | CMD_AT);
 320         else
 321                 sja1000_write_cmdreg(priv, CMD_TR);
 322
 323         return NETDEV_TX_OK;
 324 }
 325
 326 static void sja1000_rx(struct net_device *dev)
 327 {
 328         struct sja1000_priv *priv = netdev_priv(dev);
 329         struct net_device_stats *stats = &dev->stats;
 330         struct can_frame *cf;
 331         struct sk_buff *skb;
 332         uint8_t fi;
 333         uint8_t dreg;
 334         canid_t id;
 335         int i;
 336
 337         /* create zero'ed CAN frame buffer */
 338         skb = alloc_can_skb(dev, &cf);
 339         if (skb == NULL)
 340                 return;
 341
 342         fi = priv->read_reg(priv, SJA1000_FI);
 343
 344         if (fi & SJA1000_FI_FF) {
 345                 /* extended frame format (EFF) */
 346                 dreg = SJA1000_EFF_BUF;
 347                 id = (priv->read_reg(priv, SJA1000_ID1) << 21)
 348                     | (priv->read_reg(priv, SJA1000_ID2) << 13)
 349                     | (priv->read_reg(priv, SJA1000_ID3) << 5)
 350                     | (priv->read_reg(priv, SJA1000_ID4) >> 3);
 351                 id |= CAN_EFF_FLAG;
 352         } else {
 353                 /* standard frame format (SFF) */
 354                 dreg = SJA1000_SFF_BUF;
 355                 id = (priv->read_reg(priv, SJA1000_ID1) << 3)
 356                     | (priv->read_reg(priv, SJA1000_ID2) >> 5);
 357         }
 358
 359         cf->can_dlc = get_can_dlc(fi & 0x0F);
 360         if (fi & SJA1000_FI_RTR) {
 361                 id |= CAN_RTR_FLAG;
 362         } else {
 363                 for (i = 0; i < cf->can_dlc; i++)
 364                         cf->data[i] = priv->read_reg(priv, dreg++);
 365         }
 366
 367         cf->can_id = id;
 368
 369         /* release receive buffer */
 370         sja1000_write_cmdreg(priv, CMD_RRB);
 371
 372         netif_rx(skb);
 373
 374         stats->rx_packets++;
 375         stats->rx_bytes += cf->can_dlc;
 376
 377         can_led_event(dev, CAN_LED_EVENT_RX);
 378 }
 379
 380 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 381 {
 382         struct sja1000_priv *priv = netdev_priv(dev);
 383         struct net_device_stats *stats = &dev->stats;
 384         struct can_frame *cf;
 385         struct sk_buff *skb;
 386         enum can_state state = priv->can.state;
 387         uint8_t ecc, alc;
 388
 389         skb = alloc_can_err_skb(dev, &cf);
 390         if (skb == NULL)
 391                 return -ENOMEM;
 392
 393         if (isrc & IRQ_DOI) {
 394                 /* data overrun interrupt */
 395                 netdev_dbg(dev, "data overrun interrupt\n");
 396                 cf->can_id |= CAN_ERR_CRTL;
 397                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 398                 stats->rx_over_errors++;
 399                 stats->rx_errors++;
 400                 sja1000_write_cmdreg(priv, CMD_CDO);    /* clear bit */
 401         }
 402
 403         if (isrc & IRQ_EI) {
 404                 /* error warning interrupt */
 405                 netdev_dbg(dev, "error warning interrupt\n");
 406
 407                 if (status & SR_BS) {
 408                         state = CAN_STATE_BUS_OFF;
 409                         cf->can_id |= CAN_ERR_BUSOFF;
 410                         can_bus_off(dev);
 411                 } else if (status & SR_ES) {
 412                         state = CAN_STATE_ERROR_WARNING;
 413                 } else
 414                         state = CAN_STATE_ERROR_ACTIVE;
 415         }
 416         if (isrc & IRQ_BEI) {
 417                 /* bus error interrupt */
 418                 priv->can.can_stats.bus_error++;
 419                 stats->rx_errors++;
 420
 421                 ecc = priv->read_reg(priv, SJA1000_ECC);
 422
 423                 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 424
 425                 switch (ecc & ECC_MASK) {
 426                 case ECC_BIT:
 427                         cf->data[2] |= CAN_ERR_PROT_BIT;
 428                         break;
 429                 case ECC_FORM:
 430                         cf->data[2] |= CAN_ERR_PROT_FORM;
 431                         break;
 432                 case ECC_STUFF:
 433                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 434                         break;
 435                 default:
 436                         cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 437                         cf->data[3] = ecc & ECC_SEG;
 438                         break;
 439                 }
 440                 /* Error occurred during transmission? */
 441                 if ((ecc & ECC_DIR) == 0)
 442                         cf->data[2] |= CAN_ERR_PROT_TX;
 443         }
 444         if (isrc & IRQ_EPI) {
 445                 /* error passive interrupt */
 446                 netdev_dbg(dev, "error passive interrupt\n");
 447                 if (status & SR_ES)
 448                         state = CAN_STATE_ERROR_PASSIVE;
 449                 else
 450                         state = CAN_STATE_ERROR_ACTIVE;
 451         }
 452         if (isrc & IRQ_ALI) {
 453                 /* arbitration lost interrupt */
 454                 netdev_dbg(dev, "arbitration lost interrupt\n");
 455                 alc = priv->read_reg(priv, SJA1000_ALC);
 456                 priv->can.can_stats.arbitration_lost++;
 457                 stats->tx_errors++;
 458                 cf->can_id |= CAN_ERR_LOSTARB;
 459                 cf->data[0] = alc & 0x1f;
 460         }
 461
 462         if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
 463                                          state == CAN_STATE_ERROR_PASSIVE)) {
 464                 uint8_t rxerr = priv->read_reg(priv, SJA1000_RXERR);
 465                 uint8_t txerr = priv->read_reg(priv, SJA1000_TXERR);
 466                 cf->can_id |= CAN_ERR_CRTL;
 467                 if (state == CAN_STATE_ERROR_WARNING) {
 468                         priv->can.can_stats.error_warning++;
 469                         cf->data[1] = (txerr > rxerr) ?
 470                                 CAN_ERR_CRTL_TX_WARNING :
 471                                 CAN_ERR_CRTL_RX_WARNING;
 472                 } else {
 473                         priv->can.can_stats.error_passive++;
 474                         cf->data[1] = (txerr > rxerr) ?
 475                                 CAN_ERR_CRTL_TX_PASSIVE :
 476                                 CAN_ERR_CRTL_RX_PASSIVE;
 477                 }
 478                 cf->data[6] = txerr;
 479                 cf->data[7] = rxerr;
 480         }
 481
 482         priv->can.state = state;
 483
 484         netif_rx(skb);
 485
 486         stats->rx_packets++;
 487         stats->rx_bytes += cf->can_dlc;
 488
 489         return 0;
 490 }
 491
 492 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 493 {
 494         struct net_device *dev = (struct net_device *)dev_id;
 495         struct sja1000_priv *priv = netdev_priv(dev);
 496         struct net_device_stats *stats = &dev->stats;
 497         uint8_t isrc, status;
 498         int n = 0;
 499
 500         if (priv->pre_irq)
 501                 priv->pre_irq(priv);
 502
 503         /* Shared interrupts and IRQ off? */
 504         if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF)
 505                 goto out;
 506
 507         while ((isrc = priv->read_reg(priv, SJA1000_IR)) &&
 508                (n < SJA1000_MAX_IRQ)) {
 509
 510                 status = priv->read_reg(priv, SJA1000_SR);
 511                 /* check for absent controller due to hw unplug */
 512                 if (status == 0xFF && sja1000_is_absent(priv))
 513                         goto out;
 514
 515                 if (isrc & IRQ_WUI)
 516                         netdev_warn(dev, "wakeup interrupt\n");
 517
 518                 if (isrc & IRQ_TI) {
 519                         /* transmission buffer released */
 520                         if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT &&
 521                             !(status & SR_TCS)) {
 522                                 stats->tx_errors++;
 523                                 can_free_echo_skb(dev, 0);
 524                         } else {
 525                                 /* transmission complete */
 526                                 stats->tx_bytes +=
 527                                         priv->read_reg(priv, SJA1000_FI) & 0xf;
 528                                 stats->tx_packets++;
 529                                 can_get_echo_skb(dev, 0);
 530                         }
 531                         netif_wake_queue(dev);
 532                         can_led_event(dev, CAN_LED_EVENT_TX);
 533                 }
 534                 if (isrc & IRQ_RI) {
 535                         /* receive interrupt */
 536                         while (status & SR_RBS) {
 537                                 sja1000_rx(dev);
 538                                 status = priv->read_reg(priv, SJA1000_SR);
 539                                 /* check for absent controller */
 540                                 if (status == 0xFF && sja1000_is_absent(priv))
 541                                         goto out;
 542                         }
 543                 }
 544                 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
 545                         /* error interrupt */
 546                         if (sja1000_err(dev, isrc, status))
 547                                 break;
 548                 }
 549                 n++;
 550         }
 551 out:
 552         if (priv->post_irq)
 553                 priv->post_irq(priv);
 554
 555         if (n >= SJA1000_MAX_IRQ)
 556                 netdev_dbg(dev, "%d messages handled in ISR", n);
 557
 558         return (n) ? IRQ_HANDLED : IRQ_NONE;
 559 }
 560 EXPORT_SYMBOL_GPL(sja1000_interrupt);
 561
 562 static int sja1000_open(struct net_device *dev)
 563 {
 564         struct sja1000_priv *priv = netdev_priv(dev);
 565         int err;
 566
 567         /* set chip into reset mode */
 568         set_reset_mode(dev);
 569
 570         /* common open */
 571         err = open_candev(dev);
 572         if (err)
 573                 return err;
 574
 575         /* register interrupt handler, if not done by the device driver */
 576         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
 577                 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
 578                                   dev->name, (void *)dev);
 579                 if (err) {
 580                         close_candev(dev);
 581                         return -EAGAIN;
 582                 }
 583         }
 584
 585         /* init and start chi */
 586         sja1000_start(dev);
 587
 588         can_led_event(dev, CAN_LED_EVENT_OPEN);
 589
 590         netif_start_queue(dev);
 591
 592         return 0;
 593 }
 594
 595 static int sja1000_close(struct net_device *dev)
 596 {
 597         struct sja1000_priv *priv = netdev_priv(dev);
 598
 599         netif_stop_queue(dev);
 600         set_reset_mode(dev);
 601
 602         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
 603                 free_irq(dev->irq, (void *)dev);
 604
 605         close_candev(dev);
 606
 607         can_led_event(dev, CAN_LED_EVENT_STOP);
 608
 609         return 0;
 610 }
 611
 612 struct net_device *alloc_sja1000dev(int sizeof_priv)
 613 {
 614         struct net_device *dev;
 615         struct sja1000_priv *priv;
 616
 617         dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
 618                 SJA1000_ECHO_SKB_MAX);
 619         if (!dev)
 620                 return NULL;
 621
 622         priv = netdev_priv(dev);
 623
 624         priv->dev = dev;
 625         priv->can.bittiming_const = &sja1000_bittiming_const;
 626         priv->can.do_set_bittiming = sja1000_set_bittiming;
 627         priv->can.do_set_mode = sja1000_set_mode;
 628         priv->can.do_get_berr_counter = sja1000_get_berr_counter;
 629         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
 630                 CAN_CTRLMODE_BERR_REPORTING | CAN_CTRLMODE_LISTENONLY |
 631                 CAN_CTRLMODE_ONE_SHOT;
 632
 633         spin_lock_init(&priv->cmdreg_lock);
 634
 635         if (sizeof_priv)
 636                 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
 637
 638         return dev;
 639 }
 640 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
 641
 642 void free_sja1000dev(struct net_device *dev)
 643 {
 644         free_candev(dev);
 645 }
 646 EXPORT_SYMBOL_GPL(free_sja1000dev);
 647
 648 static const struct net_device_ops sja1000_netdev_ops = {
 649        .ndo_open               = sja1000_open,
 650        .ndo_stop               = sja1000_close,
 651        .ndo_start_xmit         = sja1000_start_xmit,
 652 };
 653
 654 int register_sja1000dev(struct net_device *dev)
 655 {
 656         int ret;
 657
 658         if (!sja1000_probe_chip(dev))
 659                 return -ENODEV;
 660
 661         dev->flags |= IFF_ECHO; /* we support local echo */
 662         dev->netdev_ops = &sja1000_netdev_ops;
 663
 664         set_reset_mode(dev);
 665         chipset_init(dev);
 666
 667         ret =  register_candev(dev);
 668
 669         if (!ret)
 670                 devm_can_led_init(dev);
 671
 672         return ret;
 673 }
 674 EXPORT_SYMBOL_GPL(register_sja1000dev);
 675
 676 void unregister_sja1000dev(struct net_device *dev)
 677 {
 678         set_reset_mode(dev);
 679         unregister_candev(dev);
 680 }
 681 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
 682
 683 static __init int sja1000_init(void)
 684 {
 685         printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
 686
 687         return 0;
 688 }
 689
 690 module_init(sja1000_init);
 691
 692 static __exit void sja1000_exit(void)
 693 {
 694         printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
 695 }
 696
 697 module_exit(sja1000_exit);