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                 netdev_err(dev, "probing failed\n");
 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, SJA1000_MOD);
 119         int i;
 120
 121         /* disable interrupts */
 122         priv->write_reg(priv, SJA1000_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                 /* reset chip */
 132                 priv->write_reg(priv, SJA1000_MOD, MOD_RM);
 133                 udelay(10);
 134                 status = priv->read_reg(priv, SJA1000_MOD);
 135         }
 136
 137         netdev_err(dev, "setting SJA1000 into reset mode failed!\n");
 138 }
 139
 140 static void set_normal_mode(struct net_device *dev)
 141 {
 142         struct sja1000_priv *priv = netdev_priv(dev);
 143         unsigned char status = priv->read_reg(priv, SJA1000_MOD);
 144         u8 mod_reg_val = 0x00;
 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                         mod_reg_val |= MOD_LOM;
 163                 if (priv->can.ctrlmode & CAN_CTRLMODE_PRESUME_ACK)
 164                         mod_reg_val |= MOD_STM;
 165                 priv->write_reg(priv, SJA1000_MOD, mod_reg_val);
 166
 167                 udelay(10);
 168
 169                 status = priv->read_reg(priv, SJA1000_MOD);
 170         }
 171
 172         netdev_err(dev, "setting SJA1000 into normal mode failed!\n");
 173 }
 174
 175 /*
 176  * initialize SJA1000 chip:
 177  *   - reset chip
 178  *   - set output mode
 179  *   - set baudrate
 180  *   - enable interrupts
 181  *   - start operating mode
 182  */
 183 static void chipset_init(struct net_device *dev)
 184 {
 185         struct sja1000_priv *priv = netdev_priv(dev);
 186
 187         /* set clock divider and output control register */
 188         priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN);
 189
 190         /* set acceptance filter (accept all) */
 191         priv->write_reg(priv, SJA1000_ACCC0, 0x00);
 192         priv->write_reg(priv, SJA1000_ACCC1, 0x00);
 193         priv->write_reg(priv, SJA1000_ACCC2, 0x00);
 194         priv->write_reg(priv, SJA1000_ACCC3, 0x00);
 195
 196         priv->write_reg(priv, SJA1000_ACCM0, 0xFF);
 197         priv->write_reg(priv, SJA1000_ACCM1, 0xFF);
 198         priv->write_reg(priv, SJA1000_ACCM2, 0xFF);
 199         priv->write_reg(priv, SJA1000_ACCM3, 0xFF);
 200
 201         priv->write_reg(priv, SJA1000_OCR, priv->ocr | OCR_MODE_NORMAL);
 202 }
 203
 204 static void sja1000_start(struct net_device *dev)
 205 {
 206         struct sja1000_priv *priv = netdev_priv(dev);
 207
 208         /* leave reset mode */
 209         if (priv->can.state != CAN_STATE_STOPPED)
 210                 set_reset_mode(dev);
 211
 212         /* Initialize chip if uninitialized at this stage */
 213         if (!(priv->read_reg(priv, SJA1000_CDR) & CDR_PELICAN))
 214                 chipset_init(dev);
 215
 216         /* Clear error counters and error code capture */
 217         priv->write_reg(priv, SJA1000_TXERR, 0x0);
 218         priv->write_reg(priv, SJA1000_RXERR, 0x0);
 219         priv->read_reg(priv, SJA1000_ECC);
 220
 221         /* leave reset mode */
 222         set_normal_mode(dev);
 223 }
 224
 225 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
 226 {
 227         switch (mode) {
 228         case CAN_MODE_START:
 229                 sja1000_start(dev);
 230                 if (netif_queue_stopped(dev))
 231                         netif_wake_queue(dev);
 232                 break;
 233
 234         default:
 235                 return -EOPNOTSUPP;
 236         }
 237
 238         return 0;
 239 }
 240
 241 static int sja1000_set_bittiming(struct net_device *dev)
 242 {
 243         struct sja1000_priv *priv = netdev_priv(dev);
 244         struct can_bittiming *bt = &priv->can.bittiming;
 245         u8 btr0, btr1;
 246
 247         btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
 248         btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
 249                 (((bt->phase_seg2 - 1) & 0x7) << 4);
 250         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
 251                 btr1 |= 0x80;
 252
 253         netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
 254
 255         priv->write_reg(priv, SJA1000_BTR0, btr0);
 256         priv->write_reg(priv, SJA1000_BTR1, btr1);
 257
 258         return 0;
 259 }
 260
 261 static int sja1000_get_berr_counter(const struct net_device *dev,
 262                                     struct can_berr_counter *bec)
 263 {
 264         struct sja1000_priv *priv = netdev_priv(dev);
 265
 266         bec->txerr = priv->read_reg(priv, SJA1000_TXERR);
 267         bec->rxerr = priv->read_reg(priv, SJA1000_RXERR);
 268
 269         return 0;
 270 }
 271
 272 /*
 273  * transmit a CAN message
 274  * message layout in the sk_buff should be like this:
 275  * xx xx xx xx   ff      ll   00 11 22 33 44 55 66 77
 276  * [  can-id ] [flags] [len] [can data (up to 8 bytes]
 277  */
 278 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
 279                                             struct net_device *dev)
 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         u8 cmd_reg_val = 0x00;
 288         int i;
 289
 290         if (can_dropped_invalid_skb(dev, skb))
 291                 return NETDEV_TX_OK;
 292
 293         netif_stop_queue(dev);
 294
 295         fi = dlc = cf->can_dlc;
 296         id = cf->can_id;
 297
 298         if (id & CAN_RTR_FLAG)
 299                 fi |= SJA1000_FI_RTR;
 300
 301         if (id & CAN_EFF_FLAG) {
 302                 fi |= SJA1000_FI_FF;
 303                 dreg = SJA1000_EFF_BUF;
 304                 priv->write_reg(priv, SJA1000_FI, fi);
 305                 priv->write_reg(priv, SJA1000_ID1, (id & 0x1fe00000) >> 21);
 306                 priv->write_reg(priv, SJA1000_ID2, (id & 0x001fe000) >> 13);
 307                 priv->write_reg(priv, SJA1000_ID3, (id & 0x00001fe0) >> 5);
 308                 priv->write_reg(priv, SJA1000_ID4, (id & 0x0000001f) << 3);
 309         } else {
 310                 dreg = SJA1000_SFF_BUF;
 311                 priv->write_reg(priv, SJA1000_FI, fi);
 312                 priv->write_reg(priv, SJA1000_ID1, (id & 0x000007f8) >> 3);
 313                 priv->write_reg(priv, SJA1000_ID2, (id & 0x00000007) << 5);
 314         }
 315
 316         for (i = 0; i < dlc; i++)
 317                 priv->write_reg(priv, dreg++, cf->data[i]);
 318
 319         can_put_echo_skb(skb, dev, 0);
 320
 321         if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
 322                 cmd_reg_val |= CMD_AT;
 323
 324         if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
 325                 cmd_reg_val |= CMD_SRR;
 326         else
 327                 cmd_reg_val |= CMD_TR;
 328
 329         sja1000_write_cmdreg(priv, cmd_reg_val);
 330
 331         return NETDEV_TX_OK;
 332 }
 333
 334 static void sja1000_rx(struct net_device *dev)
 335 {
 336         struct sja1000_priv *priv = netdev_priv(dev);
 337         struct net_device_stats *stats = &dev->stats;
 338         struct can_frame *cf;
 339         struct sk_buff *skb;
 340         uint8_t fi;
 341         uint8_t dreg;
 342         canid_t id;
 343         int i;
 344
 345         /* create zero'ed CAN frame buffer */
 346         skb = alloc_can_skb(dev, &cf);
 347         if (skb == NULL)
 348                 return;
 349
 350         fi = priv->read_reg(priv, SJA1000_FI);
 351
 352         if (fi & SJA1000_FI_FF) {
 353                 /* extended frame format (EFF) */
 354                 dreg = SJA1000_EFF_BUF;
 355                 id = (priv->read_reg(priv, SJA1000_ID1) << 21)
 356                     | (priv->read_reg(priv, SJA1000_ID2) << 13)
 357                     | (priv->read_reg(priv, SJA1000_ID3) << 5)
 358                     | (priv->read_reg(priv, SJA1000_ID4) >> 3);
 359                 id |= CAN_EFF_FLAG;
 360         } else {
 361                 /* standard frame format (SFF) */
 362                 dreg = SJA1000_SFF_BUF;
 363                 id = (priv->read_reg(priv, SJA1000_ID1) << 3)
 364                     | (priv->read_reg(priv, SJA1000_ID2) >> 5);
 365         }
 366
 367         cf->can_dlc = get_can_dlc(fi & 0x0F);
 368         if (fi & SJA1000_FI_RTR) {
 369                 id |= CAN_RTR_FLAG;
 370         } else {
 371                 for (i = 0; i < cf->can_dlc; i++)
 372                         cf->data[i] = priv->read_reg(priv, dreg++);
 373         }
 374
 375         cf->can_id = id;
 376
 377         /* release receive buffer */
 378         sja1000_write_cmdreg(priv, CMD_RRB);
 379
 380         netif_rx(skb);
 381
 382         stats->rx_packets++;
 383         stats->rx_bytes += cf->can_dlc;
 384
 385         can_led_event(dev, CAN_LED_EVENT_RX);
 386 }
 387
 388 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 389 {
 390         struct sja1000_priv *priv = netdev_priv(dev);
 391         struct net_device_stats *stats = &dev->stats;
 392         struct can_frame *cf;
 393         struct sk_buff *skb;
 394         enum can_state state = priv->can.state;
 395         uint8_t ecc, alc;
 396
 397         skb = alloc_can_err_skb(dev, &cf);
 398         if (skb == NULL)
 399                 return -ENOMEM;
 400
 401         if (isrc & IRQ_DOI) {
 402                 /* data overrun interrupt */
 403                 netdev_dbg(dev, "data overrun interrupt\n");
 404                 cf->can_id |= CAN_ERR_CRTL;
 405                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 406                 stats->rx_over_errors++;
 407                 stats->rx_errors++;
 408                 sja1000_write_cmdreg(priv, CMD_CDO);    /* clear bit */
 409         }
 410
 411         if (isrc & IRQ_EI) {
 412                 /* error warning interrupt */
 413                 netdev_dbg(dev, "error warning interrupt\n");
 414
 415                 if (status & SR_BS) {
 416                         state = CAN_STATE_BUS_OFF;
 417                         cf->can_id |= CAN_ERR_BUSOFF;
 418                         can_bus_off(dev);
 419                 } else if (status & SR_ES) {
 420                         state = CAN_STATE_ERROR_WARNING;
 421                 } else
 422                         state = CAN_STATE_ERROR_ACTIVE;
 423         }
 424         if (isrc & IRQ_BEI) {
 425                 /* bus error interrupt */
 426                 priv->can.can_stats.bus_error++;
 427                 stats->rx_errors++;
 428
 429                 ecc = priv->read_reg(priv, SJA1000_ECC);
 430
 431                 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 432
 433                 switch (ecc & ECC_MASK) {
 434                 case ECC_BIT:
 435                         cf->data[2] |= CAN_ERR_PROT_BIT;
 436                         break;
 437                 case ECC_FORM:
 438                         cf->data[2] |= CAN_ERR_PROT_FORM;
 439                         break;
 440                 case ECC_STUFF:
 441                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 442                         break;
 443                 default:
 444                         cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 445                         cf->data[3] = ecc & ECC_SEG;
 446                         break;
 447                 }
 448                 /* Error occurred during transmission? */
 449                 if ((ecc & ECC_DIR) == 0)
 450                         cf->data[2] |= CAN_ERR_PROT_TX;
 451         }
 452         if (isrc & IRQ_EPI) {
 453                 /* error passive interrupt */
 454                 netdev_dbg(dev, "error passive interrupt\n");
 455                 if (status & SR_ES)
 456                         state = CAN_STATE_ERROR_PASSIVE;
 457                 else
 458                         state = CAN_STATE_ERROR_ACTIVE;
 459         }
 460         if (isrc & IRQ_ALI) {
 461                 /* arbitration lost interrupt */
 462                 netdev_dbg(dev, "arbitration lost interrupt\n");
 463                 alc = priv->read_reg(priv, SJA1000_ALC);
 464                 priv->can.can_stats.arbitration_lost++;
 465                 stats->tx_errors++;
 466                 cf->can_id |= CAN_ERR_LOSTARB;
 467                 cf->data[0] = alc & 0x1f;
 468         }
 469
 470         if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
 471                                          state == CAN_STATE_ERROR_PASSIVE)) {
 472                 uint8_t rxerr = priv->read_reg(priv, SJA1000_RXERR);
 473                 uint8_t txerr = priv->read_reg(priv, SJA1000_TXERR);
 474                 cf->can_id |= CAN_ERR_CRTL;
 475                 if (state == CAN_STATE_ERROR_WARNING) {
 476                         priv->can.can_stats.error_warning++;
 477                         cf->data[1] = (txerr > rxerr) ?
 478                                 CAN_ERR_CRTL_TX_WARNING :
 479                                 CAN_ERR_CRTL_RX_WARNING;
 480                 } else {
 481                         priv->can.can_stats.error_passive++;
 482                         cf->data[1] = (txerr > rxerr) ?
 483                                 CAN_ERR_CRTL_TX_PASSIVE :
 484                                 CAN_ERR_CRTL_RX_PASSIVE;
 485                 }
 486                 cf->data[6] = txerr;
 487                 cf->data[7] = rxerr;
 488         }
 489
 490         priv->can.state = state;
 491
 492         netif_rx(skb);
 493
 494         stats->rx_packets++;
 495         stats->rx_bytes += cf->can_dlc;
 496
 497         return 0;
 498 }
 499
 500 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 501 {
 502         struct net_device *dev = (struct net_device *)dev_id;
 503         struct sja1000_priv *priv = netdev_priv(dev);
 504         struct net_device_stats *stats = &dev->stats;
 505         uint8_t isrc, status;
 506         int n = 0;
 507
 508         if (priv->pre_irq)
 509                 priv->pre_irq(priv);
 510
 511         /* Shared interrupts and IRQ off? */
 512         if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF)
 513                 goto out;
 514
 515         while ((isrc = priv->read_reg(priv, SJA1000_IR)) &&
 516                (n < SJA1000_MAX_IRQ)) {
 517
 518                 status = priv->read_reg(priv, SJA1000_SR);
 519                 /* check for absent controller due to hw unplug */
 520                 if (status == 0xFF && sja1000_is_absent(priv))
 521                         goto out;
 522
 523                 if (isrc & IRQ_WUI)
 524                         netdev_warn(dev, "wakeup interrupt\n");
 525
 526                 if (isrc & IRQ_TI) {
 527                         /* transmission buffer released */
 528                         if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT &&
 529                             !(status & SR_TCS)) {
 530                                 stats->tx_errors++;
 531                                 can_free_echo_skb(dev, 0);
 532                         } else {
 533                                 /* transmission complete */
 534                                 stats->tx_bytes +=
 535                                         priv->read_reg(priv, SJA1000_FI) & 0xf;
 536                                 stats->tx_packets++;
 537                                 can_get_echo_skb(dev, 0);
 538                         }
 539                         netif_wake_queue(dev);
 540                         can_led_event(dev, CAN_LED_EVENT_TX);
 541                 }
 542                 if (isrc & IRQ_RI) {
 543                         /* receive interrupt */
 544                         while (status & SR_RBS) {
 545                                 sja1000_rx(dev);
 546                                 status = priv->read_reg(priv, SJA1000_SR);
 547                                 /* check for absent controller */
 548                                 if (status == 0xFF && sja1000_is_absent(priv))
 549                                         goto out;
 550                         }
 551                 }
 552                 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
 553                         /* error interrupt */
 554                         if (sja1000_err(dev, isrc, status))
 555                                 break;
 556                 }
 557                 n++;
 558         }
 559 out:
 560         if (priv->post_irq)
 561                 priv->post_irq(priv);
 562
 563         if (n >= SJA1000_MAX_IRQ)
 564                 netdev_dbg(dev, "%d messages handled in ISR", n);
 565
 566         return (n) ? IRQ_HANDLED : IRQ_NONE;
 567 }
 568 EXPORT_SYMBOL_GPL(sja1000_interrupt);
 569
 570 static int sja1000_open(struct net_device *dev)
 571 {
 572         struct sja1000_priv *priv = netdev_priv(dev);
 573         int err;
 574
 575         /* set chip into reset mode */
 576         set_reset_mode(dev);
 577
 578         /* common open */
 579         err = open_candev(dev);
 580         if (err)
 581                 return err;
 582
 583         /* register interrupt handler, if not done by the device driver */
 584         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
 585                 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
 586                                   dev->name, (void *)dev);
 587                 if (err) {
 588                         close_candev(dev);
 589                         return -EAGAIN;
 590                 }
 591         }
 592
 593         /* init and start chi */
 594         sja1000_start(dev);
 595
 596         can_led_event(dev, CAN_LED_EVENT_OPEN);
 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         can_led_event(dev, CAN_LED_EVENT_STOP);
 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_LOOPBACK |
 638                                        CAN_CTRLMODE_LISTENONLY |
 639                                        CAN_CTRLMODE_3_SAMPLES |
 640                                        CAN_CTRLMODE_ONE_SHOT |
 641                                        CAN_CTRLMODE_BERR_REPORTING |
 642                                        CAN_CTRLMODE_PRESUME_ACK;
 643
 644         spin_lock_init(&priv->cmdreg_lock);
 645
 646         if (sizeof_priv)
 647                 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
 648
 649         return dev;
 650 }
 651 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
 652
 653 void free_sja1000dev(struct net_device *dev)
 654 {
 655         free_candev(dev);
 656 }
 657 EXPORT_SYMBOL_GPL(free_sja1000dev);
 658
 659 static const struct net_device_ops sja1000_netdev_ops = {
 660         .ndo_open       = sja1000_open,
 661         .ndo_stop       = sja1000_close,
 662         .ndo_start_xmit = sja1000_start_xmit,
 663         .ndo_change_mtu = can_change_mtu,
 664 };
 665
 666 int register_sja1000dev(struct net_device *dev)
 667 {
 668         int ret;
 669
 670         if (!sja1000_probe_chip(dev))
 671                 return -ENODEV;
 672
 673         dev->flags |= IFF_ECHO; /* we support local echo */
 674         dev->netdev_ops = &sja1000_netdev_ops;
 675
 676         set_reset_mode(dev);
 677         chipset_init(dev);
 678
 679         ret =  register_candev(dev);
 680
 681         if (!ret)
 682                 devm_can_led_init(dev);
 683
 684         return ret;
 685 }
 686 EXPORT_SYMBOL_GPL(register_sja1000dev);
 687
 688 void unregister_sja1000dev(struct net_device *dev)
 689 {
 690         set_reset_mode(dev);
 691         unregister_candev(dev);
 692 }
 693 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
 694
 695 static __init int sja1000_init(void)
 696 {
 697         printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
 698
 699         return 0;
 700 }
 701
 702 module_init(sja1000_init);
 703
 704 static __exit void sja1000_exit(void)
 705 {
 706         printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
 707 }
 708
 709 module_exit(sja1000_exit);