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 static void sja1000_start(struct net_device *dev)
 176 {
 177         struct sja1000_priv *priv = netdev_priv(dev);
 178
 179         /* leave reset mode */
 180         if (priv->can.state != CAN_STATE_STOPPED)
 181                 set_reset_mode(dev);
 182
 183         /* Clear error counters and error code capture */
 184         priv->write_reg(priv, SJA1000_TXERR, 0x0);
 185         priv->write_reg(priv, SJA1000_RXERR, 0x0);
 186         priv->read_reg(priv, SJA1000_ECC);
 187
 188         /* leave reset mode */
 189         set_normal_mode(dev);
 190 }
 191
 192 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
 193 {
 194         switch (mode) {
 195         case CAN_MODE_START:
 196                 sja1000_start(dev);
 197                 if (netif_queue_stopped(dev))
 198                         netif_wake_queue(dev);
 199                 break;
 200
 201         default:
 202                 return -EOPNOTSUPP;
 203         }
 204
 205         return 0;
 206 }
 207
 208 static int sja1000_set_bittiming(struct net_device *dev)
 209 {
 210         struct sja1000_priv *priv = netdev_priv(dev);
 211         struct can_bittiming *bt = &priv->can.bittiming;
 212         u8 btr0, btr1;
 213
 214         btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
 215         btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
 216                 (((bt->phase_seg2 - 1) & 0x7) << 4);
 217         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
 218                 btr1 |= 0x80;
 219
 220         netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
 221
 222         priv->write_reg(priv, SJA1000_BTR0, btr0);
 223         priv->write_reg(priv, SJA1000_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, SJA1000_TXERR);
 234         bec->rxerr = priv->read_reg(priv, SJA1000_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, SJA1000_CDR, priv->cdr | CDR_PELICAN);
 253
 254         /* set acceptance filter (accept all) */
 255         priv->write_reg(priv, SJA1000_ACCC0, 0x00);
 256         priv->write_reg(priv, SJA1000_ACCC1, 0x00);
 257         priv->write_reg(priv, SJA1000_ACCC2, 0x00);
 258         priv->write_reg(priv, SJA1000_ACCC3, 0x00);
 259
 260         priv->write_reg(priv, SJA1000_ACCM0, 0xFF);
 261         priv->write_reg(priv, SJA1000_ACCM1, 0xFF);
 262         priv->write_reg(priv, SJA1000_ACCM2, 0xFF);
 263         priv->write_reg(priv, SJA1000_ACCM3, 0xFF);
 264
 265         priv->write_reg(priv, SJA1000_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 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
 275                                             struct net_device *dev)
 276 {
 277         struct sja1000_priv *priv = netdev_priv(dev);
 278         struct can_frame *cf = (struct can_frame *)skb->data;
 279         uint8_t fi;
 280         uint8_t dlc;
 281         canid_t id;
 282         uint8_t dreg;
 283         u8 cmd_reg_val = 0x00;
 284         int i;
 285
 286         if (can_dropped_invalid_skb(dev, skb))
 287                 return NETDEV_TX_OK;
 288
 289         netif_stop_queue(dev);
 290
 291         fi = dlc = cf->can_dlc;
 292         id = cf->can_id;
 293
 294         if (id & CAN_RTR_FLAG)
 295                 fi |= SJA1000_FI_RTR;
 296
 297         if (id & CAN_EFF_FLAG) {
 298                 fi |= SJA1000_FI_FF;
 299                 dreg = SJA1000_EFF_BUF;
 300                 priv->write_reg(priv, SJA1000_FI, fi);
 301                 priv->write_reg(priv, SJA1000_ID1, (id & 0x1fe00000) >> 21);
 302                 priv->write_reg(priv, SJA1000_ID2, (id & 0x001fe000) >> 13);
 303                 priv->write_reg(priv, SJA1000_ID3, (id & 0x00001fe0) >> 5);
 304                 priv->write_reg(priv, SJA1000_ID4, (id & 0x0000001f) << 3);
 305         } else {
 306                 dreg = SJA1000_SFF_BUF;
 307                 priv->write_reg(priv, SJA1000_FI, fi);
 308                 priv->write_reg(priv, SJA1000_ID1, (id & 0x000007f8) >> 3);
 309                 priv->write_reg(priv, SJA1000_ID2, (id & 0x00000007) << 5);
 310         }
 311
 312         for (i = 0; i < dlc; i++)
 313                 priv->write_reg(priv, dreg++, cf->data[i]);
 314
 315         can_put_echo_skb(skb, dev, 0);
 316
 317         if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
 318                 cmd_reg_val |= CMD_AT;
 319
 320         if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
 321                 cmd_reg_val |= CMD_SRR;
 322         else
 323                 cmd_reg_val |= CMD_TR;
 324
 325         sja1000_write_cmdreg(priv, cmd_reg_val);
 326
 327         return NETDEV_TX_OK;
 328 }
 329
 330 static void sja1000_rx(struct net_device *dev)
 331 {
 332         struct sja1000_priv *priv = netdev_priv(dev);
 333         struct net_device_stats *stats = &dev->stats;
 334         struct can_frame *cf;
 335         struct sk_buff *skb;
 336         uint8_t fi;
 337         uint8_t dreg;
 338         canid_t id;
 339         int i;
 340
 341         /* create zero'ed CAN frame buffer */
 342         skb = alloc_can_skb(dev, &cf);
 343         if (skb == NULL)
 344                 return;
 345
 346         fi = priv->read_reg(priv, SJA1000_FI);
 347
 348         if (fi & SJA1000_FI_FF) {
 349                 /* extended frame format (EFF) */
 350                 dreg = SJA1000_EFF_BUF;
 351                 id = (priv->read_reg(priv, SJA1000_ID1) << 21)
 352                     | (priv->read_reg(priv, SJA1000_ID2) << 13)
 353                     | (priv->read_reg(priv, SJA1000_ID3) << 5)
 354                     | (priv->read_reg(priv, SJA1000_ID4) >> 3);
 355                 id |= CAN_EFF_FLAG;
 356         } else {
 357                 /* standard frame format (SFF) */
 358                 dreg = SJA1000_SFF_BUF;
 359                 id = (priv->read_reg(priv, SJA1000_ID1) << 3)
 360                     | (priv->read_reg(priv, SJA1000_ID2) >> 5);
 361         }
 362
 363         cf->can_dlc = get_can_dlc(fi & 0x0F);
 364         if (fi & SJA1000_FI_RTR) {
 365                 id |= CAN_RTR_FLAG;
 366         } else {
 367                 for (i = 0; i < cf->can_dlc; i++)
 368                         cf->data[i] = priv->read_reg(priv, dreg++);
 369         }
 370
 371         cf->can_id = id;
 372
 373         /* release receive buffer */
 374         sja1000_write_cmdreg(priv, CMD_RRB);
 375
 376         netif_rx(skb);
 377
 378         stats->rx_packets++;
 379         stats->rx_bytes += cf->can_dlc;
 380
 381         can_led_event(dev, CAN_LED_EVENT_RX);
 382 }
 383
 384 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 385 {
 386         struct sja1000_priv *priv = netdev_priv(dev);
 387         struct net_device_stats *stats = &dev->stats;
 388         struct can_frame *cf;
 389         struct sk_buff *skb;
 390         enum can_state state = priv->can.state;
 391         uint8_t ecc, alc;
 392
 393         skb = alloc_can_err_skb(dev, &cf);
 394         if (skb == NULL)
 395                 return -ENOMEM;
 396
 397         if (isrc & IRQ_DOI) {
 398                 /* data overrun interrupt */
 399                 netdev_dbg(dev, "data overrun interrupt\n");
 400                 cf->can_id |= CAN_ERR_CRTL;
 401                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 402                 stats->rx_over_errors++;
 403                 stats->rx_errors++;
 404                 sja1000_write_cmdreg(priv, CMD_CDO);    /* clear bit */
 405         }
 406
 407         if (isrc & IRQ_EI) {
 408                 /* error warning interrupt */
 409                 netdev_dbg(dev, "error warning interrupt\n");
 410
 411                 if (status & SR_BS) {
 412                         state = CAN_STATE_BUS_OFF;
 413                         cf->can_id |= CAN_ERR_BUSOFF;
 414                         can_bus_off(dev);
 415                 } else if (status & SR_ES) {
 416                         state = CAN_STATE_ERROR_WARNING;
 417                 } else
 418                         state = CAN_STATE_ERROR_ACTIVE;
 419         }
 420         if (isrc & IRQ_BEI) {
 421                 /* bus error interrupt */
 422                 priv->can.can_stats.bus_error++;
 423                 stats->rx_errors++;
 424
 425                 ecc = priv->read_reg(priv, SJA1000_ECC);
 426
 427                 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 428
 429                 switch (ecc & ECC_MASK) {
 430                 case ECC_BIT:
 431                         cf->data[2] |= CAN_ERR_PROT_BIT;
 432                         break;
 433                 case ECC_FORM:
 434                         cf->data[2] |= CAN_ERR_PROT_FORM;
 435                         break;
 436                 case ECC_STUFF:
 437                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 438                         break;
 439                 default:
 440                         cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 441                         cf->data[3] = ecc & ECC_SEG;
 442                         break;
 443                 }
 444                 /* Error occurred during transmission? */
 445                 if ((ecc & ECC_DIR) == 0)
 446                         cf->data[2] |= CAN_ERR_PROT_TX;
 447         }
 448         if (isrc & IRQ_EPI) {
 449                 /* error passive interrupt */
 450                 netdev_dbg(dev, "error passive interrupt\n");
 451                 if (status & SR_ES)
 452                         state = CAN_STATE_ERROR_PASSIVE;
 453                 else
 454                         state = CAN_STATE_ERROR_ACTIVE;
 455         }
 456         if (isrc & IRQ_ALI) {
 457                 /* arbitration lost interrupt */
 458                 netdev_dbg(dev, "arbitration lost interrupt\n");
 459                 alc = priv->read_reg(priv, SJA1000_ALC);
 460                 priv->can.can_stats.arbitration_lost++;
 461                 stats->tx_errors++;
 462                 cf->can_id |= CAN_ERR_LOSTARB;
 463                 cf->data[0] = alc & 0x1f;
 464         }
 465
 466         if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
 467                                          state == CAN_STATE_ERROR_PASSIVE)) {
 468                 uint8_t rxerr = priv->read_reg(priv, SJA1000_RXERR);
 469                 uint8_t txerr = priv->read_reg(priv, SJA1000_TXERR);
 470                 cf->can_id |= CAN_ERR_CRTL;
 471                 if (state == CAN_STATE_ERROR_WARNING) {
 472                         priv->can.can_stats.error_warning++;
 473                         cf->data[1] = (txerr > rxerr) ?
 474                                 CAN_ERR_CRTL_TX_WARNING :
 475                                 CAN_ERR_CRTL_RX_WARNING;
 476                 } else {
 477                         priv->can.can_stats.error_passive++;
 478                         cf->data[1] = (txerr > rxerr) ?
 479                                 CAN_ERR_CRTL_TX_PASSIVE :
 480                                 CAN_ERR_CRTL_RX_PASSIVE;
 481                 }
 482                 cf->data[6] = txerr;
 483                 cf->data[7] = rxerr;
 484         }
 485
 486         priv->can.state = state;
 487
 488         netif_rx(skb);
 489
 490         stats->rx_packets++;
 491         stats->rx_bytes += cf->can_dlc;
 492
 493         return 0;
 494 }
 495
 496 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 497 {
 498         struct net_device *dev = (struct net_device *)dev_id;
 499         struct sja1000_priv *priv = netdev_priv(dev);
 500         struct net_device_stats *stats = &dev->stats;
 501         uint8_t isrc, status;
 502         int n = 0;
 503
 504         if (priv->pre_irq)
 505                 priv->pre_irq(priv);
 506
 507         /* Shared interrupts and IRQ off? */
 508         if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF)
 509                 goto out;
 510
 511         while ((isrc = priv->read_reg(priv, SJA1000_IR)) &&
 512                (n < SJA1000_MAX_IRQ)) {
 513
 514                 status = priv->read_reg(priv, SJA1000_SR);
 515                 /* check for absent controller due to hw unplug */
 516                 if (status == 0xFF && sja1000_is_absent(priv))
 517                         goto out;
 518
 519                 if (isrc & IRQ_WUI)
 520                         netdev_warn(dev, "wakeup interrupt\n");
 521
 522                 if (isrc & IRQ_TI) {
 523                         /* transmission buffer released */
 524                         if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT &&
 525                             !(status & SR_TCS)) {
 526                                 stats->tx_errors++;
 527                                 can_free_echo_skb(dev, 0);
 528                         } else {
 529                                 /* transmission complete */
 530                                 stats->tx_bytes +=
 531                                         priv->read_reg(priv, SJA1000_FI) & 0xf;
 532                                 stats->tx_packets++;
 533                                 can_get_echo_skb(dev, 0);
 534                         }
 535                         netif_wake_queue(dev);
 536                         can_led_event(dev, CAN_LED_EVENT_TX);
 537                 }
 538                 if (isrc & IRQ_RI) {
 539                         /* receive interrupt */
 540                         while (status & SR_RBS) {
 541                                 sja1000_rx(dev);
 542                                 status = priv->read_reg(priv, SJA1000_SR);
 543                                 /* check for absent controller */
 544                                 if (status == 0xFF && sja1000_is_absent(priv))
 545                                         goto out;
 546                         }
 547                 }
 548                 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
 549                         /* error interrupt */
 550                         if (sja1000_err(dev, isrc, status))
 551                                 break;
 552                 }
 553                 n++;
 554         }
 555 out:
 556         if (priv->post_irq)
 557                 priv->post_irq(priv);
 558
 559         if (n >= SJA1000_MAX_IRQ)
 560                 netdev_dbg(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         /* init and start chi */
 590         sja1000_start(dev);
 591
 592         can_led_event(dev, CAN_LED_EVENT_OPEN);
 593
 594         netif_start_queue(dev);
 595
 596         return 0;
 597 }
 598
 599 static int sja1000_close(struct net_device *dev)
 600 {
 601         struct sja1000_priv *priv = netdev_priv(dev);
 602
 603         netif_stop_queue(dev);
 604         set_reset_mode(dev);
 605
 606         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
 607                 free_irq(dev->irq, (void *)dev);
 608
 609         close_candev(dev);
 610
 611         can_led_event(dev, CAN_LED_EVENT_STOP);
 612
 613         return 0;
 614 }
 615
 616 struct net_device *alloc_sja1000dev(int sizeof_priv)
 617 {
 618         struct net_device *dev;
 619         struct sja1000_priv *priv;
 620
 621         dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
 622                 SJA1000_ECHO_SKB_MAX);
 623         if (!dev)
 624                 return NULL;
 625
 626         priv = netdev_priv(dev);
 627
 628         priv->dev = dev;
 629         priv->can.bittiming_const = &sja1000_bittiming_const;
 630         priv->can.do_set_bittiming = sja1000_set_bittiming;
 631         priv->can.do_set_mode = sja1000_set_mode;
 632         priv->can.do_get_berr_counter = sja1000_get_berr_counter;
 633         priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
 634                                        CAN_CTRLMODE_LISTENONLY |
 635                                        CAN_CTRLMODE_3_SAMPLES |
 636                                        CAN_CTRLMODE_ONE_SHOT |
 637                                        CAN_CTRLMODE_BERR_REPORTING |
 638                                        CAN_CTRLMODE_PRESUME_ACK;
 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 static const struct net_device_ops sja1000_netdev_ops = {
 656         .ndo_open       = sja1000_open,
 657         .ndo_stop       = sja1000_close,
 658         .ndo_start_xmit = sja1000_start_xmit,
 659         .ndo_change_mtu = can_change_mtu,
 660 };
 661
 662 int register_sja1000dev(struct net_device *dev)
 663 {
 664         int ret;
 665
 666         if (!sja1000_probe_chip(dev))
 667                 return -ENODEV;
 668
 669         dev->flags |= IFF_ECHO; /* we support local echo */
 670         dev->netdev_ops = &sja1000_netdev_ops;
 671
 672         set_reset_mode(dev);
 673         chipset_init(dev);
 674
 675         ret =  register_candev(dev);
 676
 677         if (!ret)
 678                 devm_can_led_init(dev);
 679
 680         return ret;
 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);