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/ethtool.h> 56 #include <linux/netdevice.h> 57 #include <linux/if_arp.h> 58 #include <linux/if_ether.h> 59 #include <linux/skbuff.h> 60 #include <linux/delay.h> 61 62 #include <linux/can/dev.h> 63 #include <linux/can/error.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 if (!(priv->flags & SJA1000_QUIRK_NO_CDR_REG)) 188 /* set clock divider and output control register */ 189 priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN); 190 191 /* set acceptance filter (accept all) */ 192 priv->write_reg(priv, SJA1000_ACCC0, 0x00); 193 priv->write_reg(priv, SJA1000_ACCC1, 0x00); 194 priv->write_reg(priv, SJA1000_ACCC2, 0x00); 195 priv->write_reg(priv, SJA1000_ACCC3, 0x00); 196 197 priv->write_reg(priv, SJA1000_ACCM0, 0xFF); 198 priv->write_reg(priv, SJA1000_ACCM1, 0xFF); 199 priv->write_reg(priv, SJA1000_ACCM2, 0xFF); 200 priv->write_reg(priv, SJA1000_ACCM3, 0xFF); 201 202 priv->write_reg(priv, SJA1000_OCR, priv->ocr | OCR_MODE_NORMAL); 203 } 204 205 static void sja1000_start(struct net_device *dev) 206 { 207 struct sja1000_priv *priv = netdev_priv(dev); 208 209 /* leave reset mode */ 210 if (priv->can.state != CAN_STATE_STOPPED) 211 set_reset_mode(dev); 212 213 /* Initialize chip if uninitialized at this stage */ 214 if (!(priv->flags & SJA1000_QUIRK_NO_CDR_REG || 215 priv->read_reg(priv, SJA1000_CDR) & CDR_PELICAN)) 216 chipset_init(dev); 217 218 /* Clear error counters and error code capture */ 219 priv->write_reg(priv, SJA1000_TXERR, 0x0); 220 priv->write_reg(priv, SJA1000_RXERR, 0x0); 221 priv->read_reg(priv, SJA1000_ECC); 222 223 /* clear interrupt flags */ 224 priv->read_reg(priv, SJA1000_IR); 225 226 /* leave reset mode */ 227 set_normal_mode(dev); 228 } 229 230 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode) 231 { 232 switch (mode) { 233 case CAN_MODE_START: 234 sja1000_start(dev); 235 if (netif_queue_stopped(dev)) 236 netif_wake_queue(dev); 237 break; 238 239 default: 240 return -EOPNOTSUPP; 241 } 242 243 return 0; 244 } 245 246 static int sja1000_set_bittiming(struct net_device *dev) 247 { 248 struct sja1000_priv *priv = netdev_priv(dev); 249 struct can_bittiming *bt = &priv->can.bittiming; 250 u8 btr0, btr1; 251 252 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); 253 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | 254 (((bt->phase_seg2 - 1) & 0x7) << 4); 255 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 256 btr1 |= 0x80; 257 258 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); 259 260 priv->write_reg(priv, SJA1000_BTR0, btr0); 261 priv->write_reg(priv, SJA1000_BTR1, btr1); 262 263 return 0; 264 } 265 266 static int sja1000_get_berr_counter(const struct net_device *dev, 267 struct can_berr_counter *bec) 268 { 269 struct sja1000_priv *priv = netdev_priv(dev); 270 271 bec->txerr = priv->read_reg(priv, SJA1000_TXERR); 272 bec->rxerr = priv->read_reg(priv, SJA1000_RXERR); 273 274 return 0; 275 } 276 277 /* 278 * transmit a CAN message 279 * message layout in the sk_buff should be like this: 280 * xx xx xx xx ff ll 00 11 22 33 44 55 66 77 281 * [ can-id ] [flags] [len] [can data (up to 8 bytes] 282 */ 283 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb, 284 struct net_device *dev) 285 { 286 struct sja1000_priv *priv = netdev_priv(dev); 287 struct can_frame *cf = (struct can_frame *)skb->data; 288 uint8_t fi; 289 canid_t id; 290 uint8_t dreg; 291 u8 cmd_reg_val = 0x00; 292 int i; 293 294 if (can_dev_dropped_skb(dev, skb)) 295 return NETDEV_TX_OK; 296 297 netif_stop_queue(dev); 298 299 fi = can_get_cc_dlc(cf, priv->can.ctrlmode); 300 id = cf->can_id; 301 302 if (id & CAN_RTR_FLAG) 303 fi |= SJA1000_FI_RTR; 304 305 if (id & CAN_EFF_FLAG) { 306 fi |= SJA1000_FI_FF; 307 dreg = SJA1000_EFF_BUF; 308 priv->write_reg(priv, SJA1000_FI, fi); 309 priv->write_reg(priv, SJA1000_ID1, (id & 0x1fe00000) >> 21); 310 priv->write_reg(priv, SJA1000_ID2, (id & 0x001fe000) >> 13); 311 priv->write_reg(priv, SJA1000_ID3, (id & 0x00001fe0) >> 5); 312 priv->write_reg(priv, SJA1000_ID4, (id & 0x0000001f) << 3); 313 } else { 314 dreg = SJA1000_SFF_BUF; 315 priv->write_reg(priv, SJA1000_FI, fi); 316 priv->write_reg(priv, SJA1000_ID1, (id & 0x000007f8) >> 3); 317 priv->write_reg(priv, SJA1000_ID2, (id & 0x00000007) << 5); 318 } 319 320 for (i = 0; i < cf->len; i++) 321 priv->write_reg(priv, dreg++, cf->data[i]); 322 323 can_put_echo_skb(skb, dev, 0, 0); 324 325 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT) 326 cmd_reg_val |= CMD_AT; 327 328 if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) 329 cmd_reg_val |= CMD_SRR; 330 else 331 cmd_reg_val |= CMD_TR; 332 333 sja1000_write_cmdreg(priv, cmd_reg_val); 334 335 return NETDEV_TX_OK; 336 } 337 338 static void sja1000_rx(struct net_device *dev) 339 { 340 struct sja1000_priv *priv = netdev_priv(dev); 341 struct net_device_stats *stats = &dev->stats; 342 struct can_frame *cf; 343 struct sk_buff *skb; 344 uint8_t fi; 345 uint8_t dreg; 346 canid_t id; 347 int i; 348 349 /* create zero'ed CAN frame buffer */ 350 skb = alloc_can_skb(dev, &cf); 351 if (skb == NULL) 352 return; 353 354 fi = priv->read_reg(priv, SJA1000_FI); 355 356 if (fi & SJA1000_FI_FF) { 357 /* extended frame format (EFF) */ 358 dreg = SJA1000_EFF_BUF; 359 id = (priv->read_reg(priv, SJA1000_ID1) << 21) 360 | (priv->read_reg(priv, SJA1000_ID2) << 13) 361 | (priv->read_reg(priv, SJA1000_ID3) << 5) 362 | (priv->read_reg(priv, SJA1000_ID4) >> 3); 363 id |= CAN_EFF_FLAG; 364 } else { 365 /* standard frame format (SFF) */ 366 dreg = SJA1000_SFF_BUF; 367 id = (priv->read_reg(priv, SJA1000_ID1) << 3) 368 | (priv->read_reg(priv, SJA1000_ID2) >> 5); 369 } 370 371 can_frame_set_cc_len(cf, fi & 0x0F, priv->can.ctrlmode); 372 if (fi & SJA1000_FI_RTR) { 373 id |= CAN_RTR_FLAG; 374 } else { 375 for (i = 0; i < cf->len; i++) 376 cf->data[i] = priv->read_reg(priv, dreg++); 377 378 stats->rx_bytes += cf->len; 379 } 380 stats->rx_packets++; 381 382 cf->can_id = id; 383 384 /* release receive buffer */ 385 sja1000_write_cmdreg(priv, CMD_RRB); 386 387 netif_rx(skb); 388 } 389 390 static irqreturn_t sja1000_reset_interrupt(int irq, void *dev_id) 391 { 392 struct net_device *dev = (struct net_device *)dev_id; 393 394 netdev_dbg(dev, "performing a soft reset upon overrun\n"); 395 396 netif_tx_lock(dev); 397 398 can_free_echo_skb(dev, 0, NULL); 399 sja1000_set_mode(dev, CAN_MODE_START); 400 401 netif_tx_unlock(dev); 402 403 return IRQ_HANDLED; 404 } 405 406 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) 407 { 408 struct sja1000_priv *priv = netdev_priv(dev); 409 struct net_device_stats *stats = &dev->stats; 410 struct can_frame *cf; 411 struct sk_buff *skb; 412 enum can_state state = priv->can.state; 413 enum can_state rx_state, tx_state; 414 unsigned int rxerr, txerr; 415 uint8_t ecc, alc; 416 int ret = 0; 417 418 skb = alloc_can_err_skb(dev, &cf); 419 if (skb == NULL) 420 return -ENOMEM; 421 422 txerr = priv->read_reg(priv, SJA1000_TXERR); 423 rxerr = priv->read_reg(priv, SJA1000_RXERR); 424 425 if (isrc & IRQ_DOI) { 426 /* data overrun interrupt */ 427 netdev_dbg(dev, "data overrun interrupt\n"); 428 cf->can_id |= CAN_ERR_CRTL; 429 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; 430 stats->rx_over_errors++; 431 stats->rx_errors++; 432 sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */ 433 434 /* Some controllers needs additional handling upon overrun 435 * condition: the controller may sometimes be totally confused 436 * and refuse any new frame while its buffer is empty. The only 437 * way to re-sync the read vs. write buffer offsets is to 438 * stop any current handling and perform a reset. 439 */ 440 if (priv->flags & SJA1000_QUIRK_RESET_ON_OVERRUN) 441 ret = IRQ_WAKE_THREAD; 442 } 443 444 if (isrc & IRQ_EI) { 445 /* error warning interrupt */ 446 netdev_dbg(dev, "error warning interrupt\n"); 447 448 if (status & SR_BS) 449 state = CAN_STATE_BUS_OFF; 450 else if (status & SR_ES) 451 state = CAN_STATE_ERROR_WARNING; 452 else 453 state = CAN_STATE_ERROR_ACTIVE; 454 } 455 if (state != CAN_STATE_BUS_OFF) { 456 cf->can_id |= CAN_ERR_CNT; 457 cf->data[6] = txerr; 458 cf->data[7] = rxerr; 459 } 460 if (isrc & IRQ_BEI) { 461 /* bus error interrupt */ 462 priv->can.can_stats.bus_error++; 463 stats->rx_errors++; 464 465 ecc = priv->read_reg(priv, SJA1000_ECC); 466 467 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 468 469 /* set error type */ 470 switch (ecc & ECC_MASK) { 471 case ECC_BIT: 472 cf->data[2] |= CAN_ERR_PROT_BIT; 473 break; 474 case ECC_FORM: 475 cf->data[2] |= CAN_ERR_PROT_FORM; 476 break; 477 case ECC_STUFF: 478 cf->data[2] |= CAN_ERR_PROT_STUFF; 479 break; 480 default: 481 break; 482 } 483 484 /* set error location */ 485 cf->data[3] = ecc & ECC_SEG; 486 487 /* Error occurred during transmission? */ 488 if ((ecc & ECC_DIR) == 0) 489 cf->data[2] |= CAN_ERR_PROT_TX; 490 } 491 if (isrc & IRQ_EPI) { 492 /* error passive interrupt */ 493 netdev_dbg(dev, "error passive interrupt\n"); 494 495 if (state == CAN_STATE_ERROR_PASSIVE) 496 state = CAN_STATE_ERROR_WARNING; 497 else 498 state = CAN_STATE_ERROR_PASSIVE; 499 } 500 if (isrc & IRQ_ALI) { 501 /* arbitration lost interrupt */ 502 netdev_dbg(dev, "arbitration lost interrupt\n"); 503 alc = priv->read_reg(priv, SJA1000_ALC); 504 priv->can.can_stats.arbitration_lost++; 505 cf->can_id |= CAN_ERR_LOSTARB; 506 cf->data[0] = alc & 0x1f; 507 } 508 509 if (state != priv->can.state) { 510 tx_state = txerr >= rxerr ? state : 0; 511 rx_state = txerr <= rxerr ? state : 0; 512 513 can_change_state(dev, cf, tx_state, rx_state); 514 515 if(state == CAN_STATE_BUS_OFF) 516 can_bus_off(dev); 517 } 518 519 netif_rx(skb); 520 521 return ret; 522 } 523 524 irqreturn_t sja1000_interrupt(int irq, void *dev_id) 525 { 526 struct net_device *dev = (struct net_device *)dev_id; 527 struct sja1000_priv *priv = netdev_priv(dev); 528 struct net_device_stats *stats = &dev->stats; 529 uint8_t isrc, status; 530 irqreturn_t ret = 0; 531 int n = 0, err; 532 533 if (priv->pre_irq) 534 priv->pre_irq(priv); 535 536 /* Shared interrupts and IRQ off? */ 537 if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF) 538 goto out; 539 540 while ((isrc = priv->read_reg(priv, SJA1000_IR)) && 541 (n < SJA1000_MAX_IRQ)) { 542 543 status = priv->read_reg(priv, SJA1000_SR); 544 /* check for absent controller due to hw unplug */ 545 if (status == 0xFF && sja1000_is_absent(priv)) 546 goto out; 547 548 if (isrc & IRQ_WUI) 549 netdev_warn(dev, "wakeup interrupt\n"); 550 551 if (isrc & IRQ_TI) { 552 /* transmission buffer released */ 553 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT && 554 !(status & SR_TCS)) { 555 stats->tx_errors++; 556 can_free_echo_skb(dev, 0, NULL); 557 } else { 558 /* transmission complete */ 559 stats->tx_bytes += can_get_echo_skb(dev, 0, NULL); 560 stats->tx_packets++; 561 } 562 netif_wake_queue(dev); 563 } 564 if (isrc & IRQ_RI) { 565 /* receive interrupt */ 566 while (status & SR_RBS) { 567 sja1000_rx(dev); 568 status = priv->read_reg(priv, SJA1000_SR); 569 /* check for absent controller */ 570 if (status == 0xFF && sja1000_is_absent(priv)) 571 goto out; 572 } 573 } 574 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) { 575 /* error interrupt */ 576 err = sja1000_err(dev, isrc, status); 577 if (err == IRQ_WAKE_THREAD) 578 ret = err; 579 if (err) 580 break; 581 } 582 n++; 583 } 584 out: 585 if (!ret) 586 ret = (n) ? IRQ_HANDLED : IRQ_NONE; 587 588 if (priv->post_irq) 589 priv->post_irq(priv); 590 591 if (n >= SJA1000_MAX_IRQ) 592 netdev_dbg(dev, "%d messages handled in ISR", n); 593 594 return ret; 595 } 596 EXPORT_SYMBOL_GPL(sja1000_interrupt); 597 598 static int sja1000_open(struct net_device *dev) 599 { 600 struct sja1000_priv *priv = netdev_priv(dev); 601 int err; 602 603 /* set chip into reset mode */ 604 set_reset_mode(dev); 605 606 /* common open */ 607 err = open_candev(dev); 608 if (err) 609 return err; 610 611 /* register interrupt handler, if not done by the device driver */ 612 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) { 613 err = request_threaded_irq(dev->irq, sja1000_interrupt, 614 sja1000_reset_interrupt, 615 priv->irq_flags, dev->name, (void *)dev); 616 if (err) { 617 close_candev(dev); 618 return -EAGAIN; 619 } 620 } 621 622 /* init and start chi */ 623 sja1000_start(dev); 624 625 netif_start_queue(dev); 626 627 return 0; 628 } 629 630 static int sja1000_close(struct net_device *dev) 631 { 632 struct sja1000_priv *priv = netdev_priv(dev); 633 634 netif_stop_queue(dev); 635 set_reset_mode(dev); 636 637 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) 638 free_irq(dev->irq, (void *)dev); 639 640 close_candev(dev); 641 642 return 0; 643 } 644 645 struct net_device *alloc_sja1000dev(int sizeof_priv) 646 { 647 struct net_device *dev; 648 struct sja1000_priv *priv; 649 650 dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv, 651 SJA1000_ECHO_SKB_MAX); 652 if (!dev) 653 return NULL; 654 655 priv = netdev_priv(dev); 656 657 priv->dev = dev; 658 priv->can.bittiming_const = &sja1000_bittiming_const; 659 priv->can.do_set_bittiming = sja1000_set_bittiming; 660 priv->can.do_set_mode = sja1000_set_mode; 661 priv->can.do_get_berr_counter = sja1000_get_berr_counter; 662 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | 663 CAN_CTRLMODE_LISTENONLY | 664 CAN_CTRLMODE_3_SAMPLES | 665 CAN_CTRLMODE_ONE_SHOT | 666 CAN_CTRLMODE_BERR_REPORTING | 667 CAN_CTRLMODE_PRESUME_ACK | 668 CAN_CTRLMODE_CC_LEN8_DLC; 669 670 spin_lock_init(&priv->cmdreg_lock); 671 672 if (sizeof_priv) 673 priv->priv = (void *)priv + sizeof(struct sja1000_priv); 674 675 return dev; 676 } 677 EXPORT_SYMBOL_GPL(alloc_sja1000dev); 678 679 void free_sja1000dev(struct net_device *dev) 680 { 681 free_candev(dev); 682 } 683 EXPORT_SYMBOL_GPL(free_sja1000dev); 684 685 static const struct net_device_ops sja1000_netdev_ops = { 686 .ndo_open = sja1000_open, 687 .ndo_stop = sja1000_close, 688 .ndo_start_xmit = sja1000_start_xmit, 689 .ndo_change_mtu = can_change_mtu, 690 }; 691 692 static const struct ethtool_ops sja1000_ethtool_ops = { 693 .get_ts_info = ethtool_op_get_ts_info, 694 }; 695 696 int register_sja1000dev(struct net_device *dev) 697 { 698 if (!sja1000_probe_chip(dev)) 699 return -ENODEV; 700 701 dev->flags |= IFF_ECHO; /* we support local echo */ 702 dev->netdev_ops = &sja1000_netdev_ops; 703 dev->ethtool_ops = &sja1000_ethtool_ops; 704 705 set_reset_mode(dev); 706 chipset_init(dev); 707 708 return register_candev(dev); 709 } 710 EXPORT_SYMBOL_GPL(register_sja1000dev); 711 712 void unregister_sja1000dev(struct net_device *dev) 713 { 714 set_reset_mode(dev); 715 unregister_candev(dev); 716 } 717 EXPORT_SYMBOL_GPL(unregister_sja1000dev); 718 719 static __init int sja1000_init(void) 720 { 721 printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME); 722 723 return 0; 724 } 725 726 module_init(sja1000_init); 727 728 static __exit void sja1000_exit(void) 729 { 730 printk(KERN_INFO "%s: driver removed\n", DRV_NAME); 731 } 732 733 module_exit(sja1000_exit); 734