1 /* 2 * Copyright (C) 2008-2010 3 * 4 * - Kurt Van Dijck, EIA Electronics 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the version 2 of the GNU General Public License 8 * as published by the Free Software Foundation 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #include <linux/module.h> 20 #include <linux/interrupt.h> 21 #include <asm/io.h> 22 23 #include "softing.h" 24 25 #define TX_ECHO_SKB_MAX (((TXMAX+1)/2)-1) 26 27 /* 28 * test is a specific CAN netdev 29 * is online (ie. up 'n running, not sleeping, not busoff 30 */ 31 static inline int canif_is_active(struct net_device *netdev) 32 { 33 struct can_priv *can = netdev_priv(netdev); 34 35 if (!netif_running(netdev)) 36 return 0; 37 return (can->state <= CAN_STATE_ERROR_PASSIVE); 38 } 39 40 /* reset DPRAM */ 41 static inline void softing_set_reset_dpram(struct softing *card) 42 { 43 if (card->pdat->generation >= 2) { 44 spin_lock_bh(&card->spin); 45 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) & ~1, 46 &card->dpram[DPRAM_V2_RESET]); 47 spin_unlock_bh(&card->spin); 48 } 49 } 50 51 static inline void softing_clr_reset_dpram(struct softing *card) 52 { 53 if (card->pdat->generation >= 2) { 54 spin_lock_bh(&card->spin); 55 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) | 1, 56 &card->dpram[DPRAM_V2_RESET]); 57 spin_unlock_bh(&card->spin); 58 } 59 } 60 61 /* trigger the tx queue-ing */ 62 static netdev_tx_t softing_netdev_start_xmit(struct sk_buff *skb, 63 struct net_device *dev) 64 { 65 struct softing_priv *priv = netdev_priv(dev); 66 struct softing *card = priv->card; 67 int ret; 68 uint8_t *ptr; 69 uint8_t fifo_wr, fifo_rd; 70 struct can_frame *cf = (struct can_frame *)skb->data; 71 uint8_t buf[DPRAM_TX_SIZE]; 72 73 if (can_dropped_invalid_skb(dev, skb)) 74 return NETDEV_TX_OK; 75 76 spin_lock(&card->spin); 77 78 ret = NETDEV_TX_BUSY; 79 if (!card->fw.up || 80 (card->tx.pending >= TXMAX) || 81 (priv->tx.pending >= TX_ECHO_SKB_MAX)) 82 goto xmit_done; 83 fifo_wr = ioread8(&card->dpram[DPRAM_TX_WR]); 84 fifo_rd = ioread8(&card->dpram[DPRAM_TX_RD]); 85 if (fifo_wr == fifo_rd) 86 /* fifo full */ 87 goto xmit_done; 88 memset(buf, 0, sizeof(buf)); 89 ptr = buf; 90 *ptr = CMD_TX; 91 if (cf->can_id & CAN_RTR_FLAG) 92 *ptr |= CMD_RTR; 93 if (cf->can_id & CAN_EFF_FLAG) 94 *ptr |= CMD_XTD; 95 if (priv->index) 96 *ptr |= CMD_BUS2; 97 ++ptr; 98 *ptr++ = cf->can_dlc; 99 *ptr++ = (cf->can_id >> 0); 100 *ptr++ = (cf->can_id >> 8); 101 if (cf->can_id & CAN_EFF_FLAG) { 102 *ptr++ = (cf->can_id >> 16); 103 *ptr++ = (cf->can_id >> 24); 104 } else { 105 /* increment 1, not 2 as you might think */ 106 ptr += 1; 107 } 108 if (!(cf->can_id & CAN_RTR_FLAG)) 109 memcpy(ptr, &cf->data[0], cf->can_dlc); 110 memcpy_toio(&card->dpram[DPRAM_TX + DPRAM_TX_SIZE * fifo_wr], 111 buf, DPRAM_TX_SIZE); 112 if (++fifo_wr >= DPRAM_TX_CNT) 113 fifo_wr = 0; 114 iowrite8(fifo_wr, &card->dpram[DPRAM_TX_WR]); 115 card->tx.last_bus = priv->index; 116 ++card->tx.pending; 117 ++priv->tx.pending; 118 can_put_echo_skb(skb, dev, priv->tx.echo_put); 119 ++priv->tx.echo_put; 120 if (priv->tx.echo_put >= TX_ECHO_SKB_MAX) 121 priv->tx.echo_put = 0; 122 /* can_put_echo_skb() saves the skb, safe to return TX_OK */ 123 ret = NETDEV_TX_OK; 124 xmit_done: 125 spin_unlock(&card->spin); 126 if (card->tx.pending >= TXMAX) { 127 int j; 128 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 129 if (card->net[j]) 130 netif_stop_queue(card->net[j]); 131 } 132 } 133 if (ret != NETDEV_TX_OK) 134 netif_stop_queue(dev); 135 136 return ret; 137 } 138 139 /* 140 * shortcut for skb delivery 141 */ 142 int softing_netdev_rx(struct net_device *netdev, const struct can_frame *msg, 143 ktime_t ktime) 144 { 145 struct sk_buff *skb; 146 struct can_frame *cf; 147 148 skb = alloc_can_skb(netdev, &cf); 149 if (!skb) 150 return -ENOMEM; 151 memcpy(cf, msg, sizeof(*msg)); 152 skb->tstamp = ktime; 153 return netif_rx(skb); 154 } 155 156 /* 157 * softing_handle_1 158 * pop 1 entry from the DPRAM queue, and process 159 */ 160 static int softing_handle_1(struct softing *card) 161 { 162 struct net_device *netdev; 163 struct softing_priv *priv; 164 ktime_t ktime; 165 struct can_frame msg; 166 int cnt = 0, lost_msg; 167 uint8_t fifo_rd, fifo_wr, cmd; 168 uint8_t *ptr; 169 uint32_t tmp_u32; 170 uint8_t buf[DPRAM_RX_SIZE]; 171 172 memset(&msg, 0, sizeof(msg)); 173 /* test for lost msgs */ 174 lost_msg = ioread8(&card->dpram[DPRAM_RX_LOST]); 175 if (lost_msg) { 176 int j; 177 /* reset condition */ 178 iowrite8(0, &card->dpram[DPRAM_RX_LOST]); 179 /* prepare msg */ 180 msg.can_id = CAN_ERR_FLAG | CAN_ERR_CRTL; 181 msg.can_dlc = CAN_ERR_DLC; 182 msg.data[1] = CAN_ERR_CRTL_RX_OVERFLOW; 183 /* 184 * service to all busses, we don't know which it was applicable 185 * but only service busses that are online 186 */ 187 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 188 netdev = card->net[j]; 189 if (!netdev) 190 continue; 191 if (!canif_is_active(netdev)) 192 /* a dead bus has no overflows */ 193 continue; 194 ++netdev->stats.rx_over_errors; 195 softing_netdev_rx(netdev, &msg, ktime_set(0, 0)); 196 } 197 /* prepare for other use */ 198 memset(&msg, 0, sizeof(msg)); 199 ++cnt; 200 } 201 202 fifo_rd = ioread8(&card->dpram[DPRAM_RX_RD]); 203 fifo_wr = ioread8(&card->dpram[DPRAM_RX_WR]); 204 205 if (++fifo_rd >= DPRAM_RX_CNT) 206 fifo_rd = 0; 207 if (fifo_wr == fifo_rd) 208 return cnt; 209 210 memcpy_fromio(buf, &card->dpram[DPRAM_RX + DPRAM_RX_SIZE*fifo_rd], 211 DPRAM_RX_SIZE); 212 mb(); 213 /* trigger dual port RAM */ 214 iowrite8(fifo_rd, &card->dpram[DPRAM_RX_RD]); 215 216 ptr = buf; 217 cmd = *ptr++; 218 if (cmd == 0xff) 219 /* not quite useful, probably the card has got out */ 220 return 0; 221 netdev = card->net[0]; 222 if (cmd & CMD_BUS2) 223 netdev = card->net[1]; 224 priv = netdev_priv(netdev); 225 226 if (cmd & CMD_ERR) { 227 uint8_t can_state, state; 228 229 state = *ptr++; 230 231 msg.can_id = CAN_ERR_FLAG; 232 msg.can_dlc = CAN_ERR_DLC; 233 234 if (state & SF_MASK_BUSOFF) { 235 can_state = CAN_STATE_BUS_OFF; 236 msg.can_id |= CAN_ERR_BUSOFF; 237 state = STATE_BUSOFF; 238 } else if (state & SF_MASK_EPASSIVE) { 239 can_state = CAN_STATE_ERROR_PASSIVE; 240 msg.can_id |= CAN_ERR_CRTL; 241 msg.data[1] = CAN_ERR_CRTL_TX_PASSIVE; 242 state = STATE_EPASSIVE; 243 } else { 244 can_state = CAN_STATE_ERROR_ACTIVE; 245 msg.can_id |= CAN_ERR_CRTL; 246 state = STATE_EACTIVE; 247 } 248 /* update DPRAM */ 249 iowrite8(state, &card->dpram[priv->index ? 250 DPRAM_INFO_BUSSTATE2 : DPRAM_INFO_BUSSTATE]); 251 /* timestamp */ 252 tmp_u32 = le32_to_cpup((void *)ptr); 253 ptr += 4; 254 ktime = softing_raw2ktime(card, tmp_u32); 255 256 ++netdev->stats.rx_errors; 257 /* update internal status */ 258 if (can_state != priv->can.state) { 259 priv->can.state = can_state; 260 if (can_state == CAN_STATE_ERROR_PASSIVE) 261 ++priv->can.can_stats.error_passive; 262 else if (can_state == CAN_STATE_BUS_OFF) { 263 /* this calls can_close_cleanup() */ 264 ++priv->can.can_stats.bus_off; 265 can_bus_off(netdev); 266 netif_stop_queue(netdev); 267 } 268 /* trigger socketcan */ 269 softing_netdev_rx(netdev, &msg, ktime); 270 } 271 272 } else { 273 if (cmd & CMD_RTR) 274 msg.can_id |= CAN_RTR_FLAG; 275 msg.can_dlc = get_can_dlc(*ptr++); 276 if (cmd & CMD_XTD) { 277 msg.can_id |= CAN_EFF_FLAG; 278 msg.can_id |= le32_to_cpup((void *)ptr); 279 ptr += 4; 280 } else { 281 msg.can_id |= le16_to_cpup((void *)ptr); 282 ptr += 2; 283 } 284 /* timestamp */ 285 tmp_u32 = le32_to_cpup((void *)ptr); 286 ptr += 4; 287 ktime = softing_raw2ktime(card, tmp_u32); 288 if (!(msg.can_id & CAN_RTR_FLAG)) 289 memcpy(&msg.data[0], ptr, 8); 290 ptr += 8; 291 /* update socket */ 292 if (cmd & CMD_ACK) { 293 /* acknowledge, was tx msg */ 294 struct sk_buff *skb; 295 skb = priv->can.echo_skb[priv->tx.echo_get]; 296 if (skb) 297 skb->tstamp = ktime; 298 can_get_echo_skb(netdev, priv->tx.echo_get); 299 ++priv->tx.echo_get; 300 if (priv->tx.echo_get >= TX_ECHO_SKB_MAX) 301 priv->tx.echo_get = 0; 302 if (priv->tx.pending) 303 --priv->tx.pending; 304 if (card->tx.pending) 305 --card->tx.pending; 306 ++netdev->stats.tx_packets; 307 if (!(msg.can_id & CAN_RTR_FLAG)) 308 netdev->stats.tx_bytes += msg.can_dlc; 309 } else { 310 int ret; 311 312 ret = softing_netdev_rx(netdev, &msg, ktime); 313 if (ret == NET_RX_SUCCESS) { 314 ++netdev->stats.rx_packets; 315 if (!(msg.can_id & CAN_RTR_FLAG)) 316 netdev->stats.rx_bytes += msg.can_dlc; 317 } else { 318 ++netdev->stats.rx_dropped; 319 } 320 } 321 } 322 ++cnt; 323 return cnt; 324 } 325 326 /* 327 * real interrupt handler 328 */ 329 static irqreturn_t softing_irq_thread(int irq, void *dev_id) 330 { 331 struct softing *card = (struct softing *)dev_id; 332 struct net_device *netdev; 333 struct softing_priv *priv; 334 int j, offset, work_done; 335 336 work_done = 0; 337 spin_lock_bh(&card->spin); 338 while (softing_handle_1(card) > 0) { 339 ++card->irq.svc_count; 340 ++work_done; 341 } 342 spin_unlock_bh(&card->spin); 343 /* resume tx queue's */ 344 offset = card->tx.last_bus; 345 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 346 if (card->tx.pending >= TXMAX) 347 break; 348 netdev = card->net[(j + offset + 1) % card->pdat->nbus]; 349 if (!netdev) 350 continue; 351 priv = netdev_priv(netdev); 352 if (!canif_is_active(netdev)) 353 /* it makes no sense to wake dead busses */ 354 continue; 355 if (priv->tx.pending >= TX_ECHO_SKB_MAX) 356 continue; 357 ++work_done; 358 netif_wake_queue(netdev); 359 } 360 return work_done ? IRQ_HANDLED : IRQ_NONE; 361 } 362 363 /* 364 * interrupt routines: 365 * schedule the 'real interrupt handler' 366 */ 367 static irqreturn_t softing_irq_v2(int irq, void *dev_id) 368 { 369 struct softing *card = (struct softing *)dev_id; 370 uint8_t ir; 371 372 ir = ioread8(&card->dpram[DPRAM_V2_IRQ_TOHOST]); 373 iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]); 374 return (1 == ir) ? IRQ_WAKE_THREAD : IRQ_NONE; 375 } 376 377 static irqreturn_t softing_irq_v1(int irq, void *dev_id) 378 { 379 struct softing *card = (struct softing *)dev_id; 380 uint8_t ir; 381 382 ir = ioread8(&card->dpram[DPRAM_IRQ_TOHOST]); 383 iowrite8(0, &card->dpram[DPRAM_IRQ_TOHOST]); 384 return ir ? IRQ_WAKE_THREAD : IRQ_NONE; 385 } 386 387 /* 388 * netdev/candev inter-operability 389 */ 390 static int softing_netdev_open(struct net_device *ndev) 391 { 392 int ret; 393 394 /* check or determine and set bittime */ 395 ret = open_candev(ndev); 396 if (!ret) 397 ret = softing_startstop(ndev, 1); 398 return ret; 399 } 400 401 static int softing_netdev_stop(struct net_device *ndev) 402 { 403 int ret; 404 405 netif_stop_queue(ndev); 406 407 /* softing cycle does close_candev() */ 408 ret = softing_startstop(ndev, 0); 409 return ret; 410 } 411 412 static int softing_candev_set_mode(struct net_device *ndev, enum can_mode mode) 413 { 414 int ret; 415 416 switch (mode) { 417 case CAN_MODE_START: 418 /* softing_startstop does close_candev() */ 419 ret = softing_startstop(ndev, 1); 420 return ret; 421 case CAN_MODE_STOP: 422 case CAN_MODE_SLEEP: 423 return -EOPNOTSUPP; 424 } 425 return 0; 426 } 427 428 /* 429 * Softing device management helpers 430 */ 431 int softing_enable_irq(struct softing *card, int enable) 432 { 433 int ret; 434 435 if (!card->irq.nr) { 436 return 0; 437 } else if (card->irq.requested && !enable) { 438 free_irq(card->irq.nr, card); 439 card->irq.requested = 0; 440 } else if (!card->irq.requested && enable) { 441 ret = request_threaded_irq(card->irq.nr, 442 (card->pdat->generation >= 2) ? 443 softing_irq_v2 : softing_irq_v1, 444 softing_irq_thread, IRQF_SHARED, 445 dev_name(&card->pdev->dev), card); 446 if (ret) { 447 dev_alert(&card->pdev->dev, 448 "request_threaded_irq(%u) failed\n", 449 card->irq.nr); 450 return ret; 451 } 452 card->irq.requested = 1; 453 } 454 return 0; 455 } 456 457 static void softing_card_shutdown(struct softing *card) 458 { 459 int fw_up = 0; 460 461 if (mutex_lock_interruptible(&card->fw.lock)) 462 /* return -ERESTARTSYS */; 463 fw_up = card->fw.up; 464 card->fw.up = 0; 465 466 if (card->irq.requested && card->irq.nr) { 467 free_irq(card->irq.nr, card); 468 card->irq.requested = 0; 469 } 470 if (fw_up) { 471 if (card->pdat->enable_irq) 472 card->pdat->enable_irq(card->pdev, 0); 473 softing_set_reset_dpram(card); 474 if (card->pdat->reset) 475 card->pdat->reset(card->pdev, 1); 476 } 477 mutex_unlock(&card->fw.lock); 478 } 479 480 static int softing_card_boot(struct softing *card) 481 { 482 int ret, j; 483 static const uint8_t stream[] = { 484 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, }; 485 unsigned char back[sizeof(stream)]; 486 487 if (mutex_lock_interruptible(&card->fw.lock)) 488 return -ERESTARTSYS; 489 if (card->fw.up) { 490 mutex_unlock(&card->fw.lock); 491 return 0; 492 } 493 /* reset board */ 494 if (card->pdat->enable_irq) 495 card->pdat->enable_irq(card->pdev, 1); 496 /* boot card */ 497 softing_set_reset_dpram(card); 498 if (card->pdat->reset) 499 card->pdat->reset(card->pdev, 1); 500 for (j = 0; (j + sizeof(stream)) < card->dpram_size; 501 j += sizeof(stream)) { 502 503 memcpy_toio(&card->dpram[j], stream, sizeof(stream)); 504 /* flush IO cache */ 505 mb(); 506 memcpy_fromio(back, &card->dpram[j], sizeof(stream)); 507 508 if (!memcmp(back, stream, sizeof(stream))) 509 continue; 510 /* memory is not equal */ 511 dev_alert(&card->pdev->dev, "dpram failed at 0x%04x\n", j); 512 ret = -EIO; 513 goto failed; 514 } 515 wmb(); 516 /* load boot firmware */ 517 ret = softing_load_fw(card->pdat->boot.fw, card, card->dpram, 518 card->dpram_size, 519 card->pdat->boot.offs - card->pdat->boot.addr); 520 if (ret < 0) 521 goto failed; 522 /* load loader firmware */ 523 ret = softing_load_fw(card->pdat->load.fw, card, card->dpram, 524 card->dpram_size, 525 card->pdat->load.offs - card->pdat->load.addr); 526 if (ret < 0) 527 goto failed; 528 529 if (card->pdat->reset) 530 card->pdat->reset(card->pdev, 0); 531 softing_clr_reset_dpram(card); 532 ret = softing_bootloader_command(card, 0, "card boot"); 533 if (ret < 0) 534 goto failed; 535 ret = softing_load_app_fw(card->pdat->app.fw, card); 536 if (ret < 0) 537 goto failed; 538 539 ret = softing_chip_poweron(card); 540 if (ret < 0) 541 goto failed; 542 543 card->fw.up = 1; 544 mutex_unlock(&card->fw.lock); 545 return 0; 546 failed: 547 card->fw.up = 0; 548 if (card->pdat->enable_irq) 549 card->pdat->enable_irq(card->pdev, 0); 550 softing_set_reset_dpram(card); 551 if (card->pdat->reset) 552 card->pdat->reset(card->pdev, 1); 553 mutex_unlock(&card->fw.lock); 554 return ret; 555 } 556 557 /* 558 * netdev sysfs 559 */ 560 static ssize_t show_chip(struct device *dev, struct device_attribute *attr, 561 char *buf) 562 { 563 struct net_device *ndev = to_net_dev(dev); 564 struct softing_priv *priv = netdev2softing(ndev); 565 566 return sprintf(buf, "%i\n", priv->chip); 567 } 568 569 static ssize_t show_output(struct device *dev, struct device_attribute *attr, 570 char *buf) 571 { 572 struct net_device *ndev = to_net_dev(dev); 573 struct softing_priv *priv = netdev2softing(ndev); 574 575 return sprintf(buf, "0x%02x\n", priv->output); 576 } 577 578 static ssize_t store_output(struct device *dev, struct device_attribute *attr, 579 const char *buf, size_t count) 580 { 581 struct net_device *ndev = to_net_dev(dev); 582 struct softing_priv *priv = netdev2softing(ndev); 583 struct softing *card = priv->card; 584 unsigned long val; 585 int ret; 586 587 ret = kstrtoul(buf, 0, &val); 588 if (ret < 0) 589 return ret; 590 val &= 0xFF; 591 592 ret = mutex_lock_interruptible(&card->fw.lock); 593 if (ret) 594 return -ERESTARTSYS; 595 if (netif_running(ndev)) { 596 mutex_unlock(&card->fw.lock); 597 return -EBUSY; 598 } 599 priv->output = val; 600 mutex_unlock(&card->fw.lock); 601 return count; 602 } 603 604 static const DEVICE_ATTR(chip, S_IRUGO, show_chip, NULL); 605 static const DEVICE_ATTR(output, S_IRUGO | S_IWUSR, show_output, store_output); 606 607 static const struct attribute *const netdev_sysfs_attrs[] = { 608 &dev_attr_chip.attr, 609 &dev_attr_output.attr, 610 NULL, 611 }; 612 static const struct attribute_group netdev_sysfs_group = { 613 .name = NULL, 614 .attrs = (struct attribute **)netdev_sysfs_attrs, 615 }; 616 617 static const struct net_device_ops softing_netdev_ops = { 618 .ndo_open = softing_netdev_open, 619 .ndo_stop = softing_netdev_stop, 620 .ndo_start_xmit = softing_netdev_start_xmit, 621 .ndo_change_mtu = can_change_mtu, 622 }; 623 624 static const struct can_bittiming_const softing_btr_const = { 625 .name = "softing", 626 .tseg1_min = 1, 627 .tseg1_max = 16, 628 .tseg2_min = 1, 629 .tseg2_max = 8, 630 .sjw_max = 4, /* overruled */ 631 .brp_min = 1, 632 .brp_max = 32, /* overruled */ 633 .brp_inc = 1, 634 }; 635 636 637 static struct net_device *softing_netdev_create(struct softing *card, 638 uint16_t chip_id) 639 { 640 struct net_device *netdev; 641 struct softing_priv *priv; 642 643 netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX); 644 if (!netdev) { 645 dev_alert(&card->pdev->dev, "alloc_candev failed\n"); 646 return NULL; 647 } 648 priv = netdev_priv(netdev); 649 priv->netdev = netdev; 650 priv->card = card; 651 memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const)); 652 priv->btr_const.brp_max = card->pdat->max_brp; 653 priv->btr_const.sjw_max = card->pdat->max_sjw; 654 priv->can.bittiming_const = &priv->btr_const; 655 priv->can.clock.freq = 8000000; 656 priv->chip = chip_id; 657 priv->output = softing_default_output(netdev); 658 SET_NETDEV_DEV(netdev, &card->pdev->dev); 659 660 netdev->flags |= IFF_ECHO; 661 netdev->netdev_ops = &softing_netdev_ops; 662 priv->can.do_set_mode = softing_candev_set_mode; 663 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; 664 665 return netdev; 666 } 667 668 static int softing_netdev_register(struct net_device *netdev) 669 { 670 int ret; 671 672 ret = register_candev(netdev); 673 if (ret) { 674 dev_alert(&netdev->dev, "register failed\n"); 675 return ret; 676 } 677 if (sysfs_create_group(&netdev->dev.kobj, &netdev_sysfs_group) < 0) 678 netdev_alert(netdev, "sysfs group failed\n"); 679 680 return 0; 681 } 682 683 static void softing_netdev_cleanup(struct net_device *netdev) 684 { 685 sysfs_remove_group(&netdev->dev.kobj, &netdev_sysfs_group); 686 unregister_candev(netdev); 687 free_candev(netdev); 688 } 689 690 /* 691 * sysfs for Platform device 692 */ 693 #define DEV_ATTR_RO(name, member) \ 694 static ssize_t show_##name(struct device *dev, \ 695 struct device_attribute *attr, char *buf) \ 696 { \ 697 struct softing *card = platform_get_drvdata(to_platform_device(dev)); \ 698 return sprintf(buf, "%u\n", card->member); \ 699 } \ 700 static DEVICE_ATTR(name, 0444, show_##name, NULL) 701 702 #define DEV_ATTR_RO_STR(name, member) \ 703 static ssize_t show_##name(struct device *dev, \ 704 struct device_attribute *attr, char *buf) \ 705 { \ 706 struct softing *card = platform_get_drvdata(to_platform_device(dev)); \ 707 return sprintf(buf, "%s\n", card->member); \ 708 } \ 709 static DEVICE_ATTR(name, 0444, show_##name, NULL) 710 711 DEV_ATTR_RO(serial, id.serial); 712 DEV_ATTR_RO_STR(firmware, pdat->app.fw); 713 DEV_ATTR_RO(firmware_version, id.fw_version); 714 DEV_ATTR_RO_STR(hardware, pdat->name); 715 DEV_ATTR_RO(hardware_version, id.hw_version); 716 DEV_ATTR_RO(license, id.license); 717 718 static struct attribute *softing_pdev_attrs[] = { 719 &dev_attr_serial.attr, 720 &dev_attr_firmware.attr, 721 &dev_attr_firmware_version.attr, 722 &dev_attr_hardware.attr, 723 &dev_attr_hardware_version.attr, 724 &dev_attr_license.attr, 725 NULL, 726 }; 727 728 static const struct attribute_group softing_pdev_group = { 729 .name = NULL, 730 .attrs = softing_pdev_attrs, 731 }; 732 733 /* 734 * platform driver 735 */ 736 static int softing_pdev_remove(struct platform_device *pdev) 737 { 738 struct softing *card = platform_get_drvdata(pdev); 739 int j; 740 741 /* first, disable card*/ 742 softing_card_shutdown(card); 743 744 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 745 if (!card->net[j]) 746 continue; 747 softing_netdev_cleanup(card->net[j]); 748 card->net[j] = NULL; 749 } 750 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group); 751 752 iounmap(card->dpram); 753 kfree(card); 754 return 0; 755 } 756 757 static int softing_pdev_probe(struct platform_device *pdev) 758 { 759 const struct softing_platform_data *pdat = dev_get_platdata(&pdev->dev); 760 struct softing *card; 761 struct net_device *netdev; 762 struct softing_priv *priv; 763 struct resource *pres; 764 int ret; 765 int j; 766 767 if (!pdat) { 768 dev_warn(&pdev->dev, "no platform data\n"); 769 return -EINVAL; 770 } 771 if (pdat->nbus > ARRAY_SIZE(card->net)) { 772 dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus); 773 return -EINVAL; 774 } 775 776 card = kzalloc(sizeof(*card), GFP_KERNEL); 777 if (!card) 778 return -ENOMEM; 779 card->pdat = pdat; 780 card->pdev = pdev; 781 platform_set_drvdata(pdev, card); 782 mutex_init(&card->fw.lock); 783 spin_lock_init(&card->spin); 784 785 ret = -EINVAL; 786 pres = platform_get_resource(pdev, IORESOURCE_MEM, 0); 787 if (!pres) 788 goto platform_resource_failed; 789 card->dpram_phys = pres->start; 790 card->dpram_size = resource_size(pres); 791 card->dpram = ioremap_nocache(card->dpram_phys, card->dpram_size); 792 if (!card->dpram) { 793 dev_alert(&card->pdev->dev, "dpram ioremap failed\n"); 794 goto ioremap_failed; 795 } 796 797 pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 798 if (pres) 799 card->irq.nr = pres->start; 800 801 /* reset card */ 802 ret = softing_card_boot(card); 803 if (ret < 0) { 804 dev_alert(&pdev->dev, "failed to boot\n"); 805 goto boot_failed; 806 } 807 808 /* only now, the chip's are known */ 809 card->id.freq = card->pdat->freq; 810 811 ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group); 812 if (ret < 0) { 813 dev_alert(&card->pdev->dev, "sysfs failed\n"); 814 goto sysfs_failed; 815 } 816 817 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 818 card->net[j] = netdev = 819 softing_netdev_create(card, card->id.chip[j]); 820 if (!netdev) { 821 dev_alert(&pdev->dev, "failed to make can[%i]", j); 822 ret = -ENOMEM; 823 goto netdev_failed; 824 } 825 netdev->dev_id = j; 826 priv = netdev_priv(card->net[j]); 827 priv->index = j; 828 ret = softing_netdev_register(netdev); 829 if (ret) { 830 free_candev(netdev); 831 card->net[j] = NULL; 832 dev_alert(&card->pdev->dev, 833 "failed to register can[%i]\n", j); 834 goto netdev_failed; 835 } 836 } 837 dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name); 838 return 0; 839 840 netdev_failed: 841 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 842 if (!card->net[j]) 843 continue; 844 softing_netdev_cleanup(card->net[j]); 845 } 846 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group); 847 sysfs_failed: 848 softing_card_shutdown(card); 849 boot_failed: 850 iounmap(card->dpram); 851 ioremap_failed: 852 platform_resource_failed: 853 kfree(card); 854 return ret; 855 } 856 857 static struct platform_driver softing_driver = { 858 .driver = { 859 .name = "softing", 860 }, 861 .probe = softing_pdev_probe, 862 .remove = softing_pdev_remove, 863 }; 864 865 module_platform_driver(softing_driver); 866 867 MODULE_ALIAS("platform:softing"); 868 MODULE_DESCRIPTION("Softing DPRAM CAN driver"); 869 MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>"); 870 MODULE_LICENSE("GPL v2"); 871