linux/drivers/net/can/sja1000/sja1000.c
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   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
  69MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
  70MODULE_LICENSE("Dual BSD/GPL");
  71MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
  72
  73static 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
  85static 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
  99static int sja1000_is_absent(struct sja1000_priv *priv)
 100{
 101        return (priv->read_reg(priv, SJA1000_MOD) == 0xFF);
 102}
 103
 104static 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
 115static 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
 140static 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 */
 183static 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
 204static 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
 225static 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
 241static 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
 261static 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 */
 278static 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
 334static 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
 388static 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
 500irqreturn_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        }
 559out:
 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}
 568EXPORT_SYMBOL_GPL(sja1000_interrupt);
 569
 570static 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
 603static 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
 620struct 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}
 651EXPORT_SYMBOL_GPL(alloc_sja1000dev);
 652
 653void free_sja1000dev(struct net_device *dev)
 654{
 655        free_candev(dev);
 656}
 657EXPORT_SYMBOL_GPL(free_sja1000dev);
 658
 659static 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
 666int 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}
 686EXPORT_SYMBOL_GPL(register_sja1000dev);
 687
 688void unregister_sja1000dev(struct net_device *dev)
 689{
 690        set_reset_mode(dev);
 691        unregister_candev(dev);
 692}
 693EXPORT_SYMBOL_GPL(unregister_sja1000dev);
 694
 695static __init int sja1000_init(void)
 696{
 697        printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
 698
 699        return 0;
 700}
 701
 702module_init(sja1000_init);
 703
 704static __exit void sja1000_exit(void)
 705{
 706        printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
 707}
 708
 709module_exit(sja1000_exit);
 710