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, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19 20 #include <linux/module.h> 21 #include <linux/init.h> 22 #include <linux/interrupt.h> 23 #include <asm/io.h> 24 25 #include "softing.h" 26 27 #define TX_ECHO_SKB_MAX (((TXMAX+1)/2)-1) 28 29 /* 30 * test is a specific CAN netdev 31 * is online (ie. up 'n running, not sleeping, not busoff 32 */ 33 static inline int canif_is_active(struct net_device *netdev) 34 { 35 struct can_priv *can = netdev_priv(netdev); 36 37 if (!netif_running(netdev)) 38 return 0; 39 return (can->state <= CAN_STATE_ERROR_PASSIVE); 40 } 41 42 /* reset DPRAM */ 43 static inline void softing_set_reset_dpram(struct softing *card) 44 { 45 if (card->pdat->generation >= 2) { 46 spin_lock_bh(&card->spin); 47 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) & ~1, 48 &card->dpram[DPRAM_V2_RESET]); 49 spin_unlock_bh(&card->spin); 50 } 51 } 52 53 static inline void softing_clr_reset_dpram(struct softing *card) 54 { 55 if (card->pdat->generation >= 2) { 56 spin_lock_bh(&card->spin); 57 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) | 1, 58 &card->dpram[DPRAM_V2_RESET]); 59 spin_unlock_bh(&card->spin); 60 } 61 } 62 63 /* trigger the tx queue-ing */ 64 static netdev_tx_t softing_netdev_start_xmit(struct sk_buff *skb, 65 struct net_device *dev) 66 { 67 struct softing_priv *priv = netdev_priv(dev); 68 struct softing *card = priv->card; 69 int ret; 70 uint8_t *ptr; 71 uint8_t fifo_wr, fifo_rd; 72 struct can_frame *cf = (struct can_frame *)skb->data; 73 uint8_t buf[DPRAM_TX_SIZE]; 74 75 if (can_dropped_invalid_skb(dev, skb)) 76 return NETDEV_TX_OK; 77 78 spin_lock(&card->spin); 79 80 ret = NETDEV_TX_BUSY; 81 if (!card->fw.up || 82 (card->tx.pending >= TXMAX) || 83 (priv->tx.pending >= TX_ECHO_SKB_MAX)) 84 goto xmit_done; 85 fifo_wr = ioread8(&card->dpram[DPRAM_TX_WR]); 86 fifo_rd = ioread8(&card->dpram[DPRAM_TX_RD]); 87 if (fifo_wr == fifo_rd) 88 /* fifo full */ 89 goto xmit_done; 90 memset(buf, 0, sizeof(buf)); 91 ptr = buf; 92 *ptr = CMD_TX; 93 if (cf->can_id & CAN_RTR_FLAG) 94 *ptr |= CMD_RTR; 95 if (cf->can_id & CAN_EFF_FLAG) 96 *ptr |= CMD_XTD; 97 if (priv->index) 98 *ptr |= CMD_BUS2; 99 ++ptr; 100 *ptr++ = cf->can_dlc; 101 *ptr++ = (cf->can_id >> 0); 102 *ptr++ = (cf->can_id >> 8); 103 if (cf->can_id & CAN_EFF_FLAG) { 104 *ptr++ = (cf->can_id >> 16); 105 *ptr++ = (cf->can_id >> 24); 106 } else { 107 /* increment 1, not 2 as you might think */ 108 ptr += 1; 109 } 110 if (!(cf->can_id & CAN_RTR_FLAG)) 111 memcpy(ptr, &cf->data[0], cf->can_dlc); 112 memcpy_toio(&card->dpram[DPRAM_TX + DPRAM_TX_SIZE * fifo_wr], 113 buf, DPRAM_TX_SIZE); 114 if (++fifo_wr >= DPRAM_TX_CNT) 115 fifo_wr = 0; 116 iowrite8(fifo_wr, &card->dpram[DPRAM_TX_WR]); 117 card->tx.last_bus = priv->index; 118 ++card->tx.pending; 119 ++priv->tx.pending; 120 can_put_echo_skb(skb, dev, priv->tx.echo_put); 121 ++priv->tx.echo_put; 122 if (priv->tx.echo_put >= TX_ECHO_SKB_MAX) 123 priv->tx.echo_put = 0; 124 /* can_put_echo_skb() saves the skb, safe to return TX_OK */ 125 ret = NETDEV_TX_OK; 126 xmit_done: 127 spin_unlock(&card->spin); 128 if (card->tx.pending >= TXMAX) { 129 int j; 130 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 131 if (card->net[j]) 132 netif_stop_queue(card->net[j]); 133 } 134 } 135 if (ret != NETDEV_TX_OK) 136 netif_stop_queue(dev); 137 138 return ret; 139 } 140 141 /* 142 * shortcut for skb delivery 143 */ 144 int softing_netdev_rx(struct net_device *netdev, const struct can_frame *msg, 145 ktime_t ktime) 146 { 147 struct sk_buff *skb; 148 struct can_frame *cf; 149 150 skb = alloc_can_skb(netdev, &cf); 151 if (!skb) 152 return -ENOMEM; 153 memcpy(cf, msg, sizeof(*msg)); 154 skb->tstamp = ktime; 155 return netif_rx(skb); 156 } 157 158 /* 159 * softing_handle_1 160 * pop 1 entry from the DPRAM queue, and process 161 */ 162 static int softing_handle_1(struct softing *card) 163 { 164 struct net_device *netdev; 165 struct softing_priv *priv; 166 ktime_t ktime; 167 struct can_frame msg; 168 int cnt = 0, lost_msg; 169 uint8_t fifo_rd, fifo_wr, cmd; 170 uint8_t *ptr; 171 uint32_t tmp_u32; 172 uint8_t buf[DPRAM_RX_SIZE]; 173 174 memset(&msg, 0, sizeof(msg)); 175 /* test for lost msgs */ 176 lost_msg = ioread8(&card->dpram[DPRAM_RX_LOST]); 177 if (lost_msg) { 178 int j; 179 /* reset condition */ 180 iowrite8(0, &card->dpram[DPRAM_RX_LOST]); 181 /* prepare msg */ 182 msg.can_id = CAN_ERR_FLAG | CAN_ERR_CRTL; 183 msg.can_dlc = CAN_ERR_DLC; 184 msg.data[1] = CAN_ERR_CRTL_RX_OVERFLOW; 185 /* 186 * service to all busses, we don't know which it was applicable 187 * but only service busses that are online 188 */ 189 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 190 netdev = card->net[j]; 191 if (!netdev) 192 continue; 193 if (!canif_is_active(netdev)) 194 /* a dead bus has no overflows */ 195 continue; 196 ++netdev->stats.rx_over_errors; 197 softing_netdev_rx(netdev, &msg, ktime_set(0, 0)); 198 } 199 /* prepare for other use */ 200 memset(&msg, 0, sizeof(msg)); 201 ++cnt; 202 } 203 204 fifo_rd = ioread8(&card->dpram[DPRAM_RX_RD]); 205 fifo_wr = ioread8(&card->dpram[DPRAM_RX_WR]); 206 207 if (++fifo_rd >= DPRAM_RX_CNT) 208 fifo_rd = 0; 209 if (fifo_wr == fifo_rd) 210 return cnt; 211 212 memcpy_fromio(buf, &card->dpram[DPRAM_RX + DPRAM_RX_SIZE*fifo_rd], 213 DPRAM_RX_SIZE); 214 mb(); 215 /* trigger dual port RAM */ 216 iowrite8(fifo_rd, &card->dpram[DPRAM_RX_RD]); 217 218 ptr = buf; 219 cmd = *ptr++; 220 if (cmd == 0xff) 221 /* not quite useful, probably the card has got out */ 222 return 0; 223 netdev = card->net[0]; 224 if (cmd & CMD_BUS2) 225 netdev = card->net[1]; 226 priv = netdev_priv(netdev); 227 228 if (cmd & CMD_ERR) { 229 uint8_t can_state, state; 230 231 state = *ptr++; 232 233 msg.can_id = CAN_ERR_FLAG; 234 msg.can_dlc = CAN_ERR_DLC; 235 236 if (state & SF_MASK_BUSOFF) { 237 can_state = CAN_STATE_BUS_OFF; 238 msg.can_id |= CAN_ERR_BUSOFF; 239 state = STATE_BUSOFF; 240 } else if (state & SF_MASK_EPASSIVE) { 241 can_state = CAN_STATE_ERROR_PASSIVE; 242 msg.can_id |= CAN_ERR_CRTL; 243 msg.data[1] = CAN_ERR_CRTL_TX_PASSIVE; 244 state = STATE_EPASSIVE; 245 } else { 246 can_state = CAN_STATE_ERROR_ACTIVE; 247 msg.can_id |= CAN_ERR_CRTL; 248 state = STATE_EACTIVE; 249 } 250 /* update DPRAM */ 251 iowrite8(state, &card->dpram[priv->index ? 252 DPRAM_INFO_BUSSTATE2 : DPRAM_INFO_BUSSTATE]); 253 /* timestamp */ 254 tmp_u32 = le32_to_cpup((void *)ptr); 255 ptr += 4; 256 ktime = softing_raw2ktime(card, tmp_u32); 257 258 ++netdev->stats.rx_errors; 259 /* update internal status */ 260 if (can_state != priv->can.state) { 261 priv->can.state = can_state; 262 if (can_state == CAN_STATE_ERROR_PASSIVE) 263 ++priv->can.can_stats.error_passive; 264 else if (can_state == CAN_STATE_BUS_OFF) { 265 /* this calls can_close_cleanup() */ 266 can_bus_off(netdev); 267 netif_stop_queue(netdev); 268 } 269 /* trigger socketcan */ 270 softing_netdev_rx(netdev, &msg, ktime); 271 } 272 273 } else { 274 if (cmd & CMD_RTR) 275 msg.can_id |= CAN_RTR_FLAG; 276 msg.can_dlc = get_can_dlc(*ptr++); 277 if (cmd & CMD_XTD) { 278 msg.can_id |= CAN_EFF_FLAG; 279 msg.can_id |= le32_to_cpup((void *)ptr); 280 ptr += 4; 281 } else { 282 msg.can_id |= le16_to_cpup((void *)ptr); 283 ptr += 2; 284 } 285 /* timestamp */ 286 tmp_u32 = le32_to_cpup((void *)ptr); 287 ptr += 4; 288 ktime = softing_raw2ktime(card, tmp_u32); 289 if (!(msg.can_id & CAN_RTR_FLAG)) 290 memcpy(&msg.data[0], ptr, 8); 291 ptr += 8; 292 /* update socket */ 293 if (cmd & CMD_ACK) { 294 /* acknowledge, was tx msg */ 295 struct sk_buff *skb; 296 skb = priv->can.echo_skb[priv->tx.echo_get]; 297 if (skb) 298 skb->tstamp = ktime; 299 can_get_echo_skb(netdev, priv->tx.echo_get); 300 ++priv->tx.echo_get; 301 if (priv->tx.echo_get >= TX_ECHO_SKB_MAX) 302 priv->tx.echo_get = 0; 303 if (priv->tx.pending) 304 --priv->tx.pending; 305 if (card->tx.pending) 306 --card->tx.pending; 307 ++netdev->stats.tx_packets; 308 if (!(msg.can_id & CAN_RTR_FLAG)) 309 netdev->stats.tx_bytes += msg.can_dlc; 310 } else { 311 int ret; 312 313 ret = softing_netdev_rx(netdev, &msg, ktime); 314 if (ret == NET_RX_SUCCESS) { 315 ++netdev->stats.rx_packets; 316 if (!(msg.can_id & CAN_RTR_FLAG)) 317 netdev->stats.rx_bytes += msg.can_dlc; 318 } else { 319 ++netdev->stats.rx_dropped; 320 } 321 } 322 } 323 ++cnt; 324 return cnt; 325 } 326 327 /* 328 * real interrupt handler 329 */ 330 static irqreturn_t softing_irq_thread(int irq, void *dev_id) 331 { 332 struct softing *card = (struct softing *)dev_id; 333 struct net_device *netdev; 334 struct softing_priv *priv; 335 int j, offset, work_done; 336 337 work_done = 0; 338 spin_lock_bh(&card->spin); 339 while (softing_handle_1(card) > 0) { 340 ++card->irq.svc_count; 341 ++work_done; 342 } 343 spin_unlock_bh(&card->spin); 344 /* resume tx queue's */ 345 offset = card->tx.last_bus; 346 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 347 if (card->tx.pending >= TXMAX) 348 break; 349 netdev = card->net[(j + offset + 1) % card->pdat->nbus]; 350 if (!netdev) 351 continue; 352 priv = netdev_priv(netdev); 353 if (!canif_is_active(netdev)) 354 /* it makes no sense to wake dead busses */ 355 continue; 356 if (priv->tx.pending >= TX_ECHO_SKB_MAX) 357 continue; 358 ++work_done; 359 netif_wake_queue(netdev); 360 } 361 return work_done ? IRQ_HANDLED : IRQ_NONE; 362 } 363 364 /* 365 * interrupt routines: 366 * schedule the 'real interrupt handler' 367 */ 368 static irqreturn_t softing_irq_v2(int irq, void *dev_id) 369 { 370 struct softing *card = (struct softing *)dev_id; 371 uint8_t ir; 372 373 ir = ioread8(&card->dpram[DPRAM_V2_IRQ_TOHOST]); 374 iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]); 375 return (1 == ir) ? IRQ_WAKE_THREAD : IRQ_NONE; 376 } 377 378 static irqreturn_t softing_irq_v1(int irq, void *dev_id) 379 { 380 struct softing *card = (struct softing *)dev_id; 381 uint8_t ir; 382 383 ir = ioread8(&card->dpram[DPRAM_IRQ_TOHOST]); 384 iowrite8(0, &card->dpram[DPRAM_IRQ_TOHOST]); 385 return ir ? IRQ_WAKE_THREAD : IRQ_NONE; 386 } 387 388 /* 389 * netdev/candev inter-operability 390 */ 391 static int softing_netdev_open(struct net_device *ndev) 392 { 393 int ret; 394 395 /* check or determine and set bittime */ 396 ret = open_candev(ndev); 397 if (!ret) 398 ret = softing_startstop(ndev, 1); 399 return ret; 400 } 401 402 static int softing_netdev_stop(struct net_device *ndev) 403 { 404 int ret; 405 406 netif_stop_queue(ndev); 407 408 /* softing cycle does close_candev() */ 409 ret = softing_startstop(ndev, 0); 410 return ret; 411 } 412 413 static int softing_candev_set_mode(struct net_device *ndev, enum can_mode mode) 414 { 415 int ret; 416 417 switch (mode) { 418 case CAN_MODE_START: 419 /* softing_startstop does close_candev() */ 420 ret = softing_startstop(ndev, 1); 421 return ret; 422 case CAN_MODE_STOP: 423 case CAN_MODE_SLEEP: 424 return -EOPNOTSUPP; 425 } 426 return 0; 427 } 428 429 /* 430 * Softing device management helpers 431 */ 432 int softing_enable_irq(struct softing *card, int enable) 433 { 434 int ret; 435 436 if (!card->irq.nr) { 437 return 0; 438 } else if (card->irq.requested && !enable) { 439 free_irq(card->irq.nr, card); 440 card->irq.requested = 0; 441 } else if (!card->irq.requested && enable) { 442 ret = request_threaded_irq(card->irq.nr, 443 (card->pdat->generation >= 2) ? 444 softing_irq_v2 : softing_irq_v1, 445 softing_irq_thread, IRQF_SHARED, 446 dev_name(&card->pdev->dev), card); 447 if (ret) { 448 dev_alert(&card->pdev->dev, 449 "request_threaded_irq(%u) failed\n", 450 card->irq.nr); 451 return ret; 452 } 453 card->irq.requested = 1; 454 } 455 return 0; 456 } 457 458 static void softing_card_shutdown(struct softing *card) 459 { 460 int fw_up = 0; 461 462 if (mutex_lock_interruptible(&card->fw.lock)) 463 /* return -ERESTARTSYS */; 464 fw_up = card->fw.up; 465 card->fw.up = 0; 466 467 if (card->irq.requested && card->irq.nr) { 468 free_irq(card->irq.nr, card); 469 card->irq.requested = 0; 470 } 471 if (fw_up) { 472 if (card->pdat->enable_irq) 473 card->pdat->enable_irq(card->pdev, 0); 474 softing_set_reset_dpram(card); 475 if (card->pdat->reset) 476 card->pdat->reset(card->pdev, 1); 477 } 478 mutex_unlock(&card->fw.lock); 479 } 480 481 static int softing_card_boot(struct softing *card) 482 { 483 int ret, j; 484 static const uint8_t stream[] = { 485 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, }; 486 unsigned char back[sizeof(stream)]; 487 488 if (mutex_lock_interruptible(&card->fw.lock)) 489 return -ERESTARTSYS; 490 if (card->fw.up) { 491 mutex_unlock(&card->fw.lock); 492 return 0; 493 } 494 /* reset board */ 495 if (card->pdat->enable_irq) 496 card->pdat->enable_irq(card->pdev, 1); 497 /* boot card */ 498 softing_set_reset_dpram(card); 499 if (card->pdat->reset) 500 card->pdat->reset(card->pdev, 1); 501 for (j = 0; (j + sizeof(stream)) < card->dpram_size; 502 j += sizeof(stream)) { 503 504 memcpy_toio(&card->dpram[j], stream, sizeof(stream)); 505 /* flush IO cache */ 506 mb(); 507 memcpy_fromio(back, &card->dpram[j], sizeof(stream)); 508 509 if (!memcmp(back, stream, sizeof(stream))) 510 continue; 511 /* memory is not equal */ 512 dev_alert(&card->pdev->dev, "dpram failed at 0x%04x\n", j); 513 ret = -EIO; 514 goto failed; 515 } 516 wmb(); 517 /* load boot firmware */ 518 ret = softing_load_fw(card->pdat->boot.fw, card, card->dpram, 519 card->dpram_size, 520 card->pdat->boot.offs - card->pdat->boot.addr); 521 if (ret < 0) 522 goto failed; 523 /* load loader firmware */ 524 ret = softing_load_fw(card->pdat->load.fw, card, card->dpram, 525 card->dpram_size, 526 card->pdat->load.offs - card->pdat->load.addr); 527 if (ret < 0) 528 goto failed; 529 530 if (card->pdat->reset) 531 card->pdat->reset(card->pdev, 0); 532 softing_clr_reset_dpram(card); 533 ret = softing_bootloader_command(card, 0, "card boot"); 534 if (ret < 0) 535 goto failed; 536 ret = softing_load_app_fw(card->pdat->app.fw, card); 537 if (ret < 0) 538 goto failed; 539 540 ret = softing_chip_poweron(card); 541 if (ret < 0) 542 goto failed; 543 544 card->fw.up = 1; 545 mutex_unlock(&card->fw.lock); 546 return 0; 547 failed: 548 card->fw.up = 0; 549 if (card->pdat->enable_irq) 550 card->pdat->enable_irq(card->pdev, 0); 551 softing_set_reset_dpram(card); 552 if (card->pdat->reset) 553 card->pdat->reset(card->pdev, 1); 554 mutex_unlock(&card->fw.lock); 555 return ret; 556 } 557 558 /* 559 * netdev sysfs 560 */ 561 static ssize_t show_channel(struct device *dev, struct device_attribute *attr, 562 char *buf) 563 { 564 struct net_device *ndev = to_net_dev(dev); 565 struct softing_priv *priv = netdev2softing(ndev); 566 567 return sprintf(buf, "%i\n", priv->index); 568 } 569 570 static ssize_t show_chip(struct device *dev, struct device_attribute *attr, 571 char *buf) 572 { 573 struct net_device *ndev = to_net_dev(dev); 574 struct softing_priv *priv = netdev2softing(ndev); 575 576 return sprintf(buf, "%i\n", priv->chip); 577 } 578 579 static ssize_t show_output(struct device *dev, struct device_attribute *attr, 580 char *buf) 581 { 582 struct net_device *ndev = to_net_dev(dev); 583 struct softing_priv *priv = netdev2softing(ndev); 584 585 return sprintf(buf, "0x%02x\n", priv->output); 586 } 587 588 static ssize_t store_output(struct device *dev, struct device_attribute *attr, 589 const char *buf, size_t count) 590 { 591 struct net_device *ndev = to_net_dev(dev); 592 struct softing_priv *priv = netdev2softing(ndev); 593 struct softing *card = priv->card; 594 unsigned long val; 595 int ret; 596 597 ret = strict_strtoul(buf, 0, &val); 598 if (ret < 0) 599 return ret; 600 val &= 0xFF; 601 602 ret = mutex_lock_interruptible(&card->fw.lock); 603 if (ret) 604 return -ERESTARTSYS; 605 if (netif_running(ndev)) { 606 mutex_unlock(&card->fw.lock); 607 return -EBUSY; 608 } 609 priv->output = val; 610 mutex_unlock(&card->fw.lock); 611 return count; 612 } 613 614 static const DEVICE_ATTR(channel, S_IRUGO, show_channel, NULL); 615 static const DEVICE_ATTR(chip, S_IRUGO, show_chip, NULL); 616 static const DEVICE_ATTR(output, S_IRUGO | S_IWUSR, show_output, store_output); 617 618 static const struct attribute *const netdev_sysfs_attrs[] = { 619 &dev_attr_channel.attr, 620 &dev_attr_chip.attr, 621 &dev_attr_output.attr, 622 NULL, 623 }; 624 static const struct attribute_group netdev_sysfs_group = { 625 .name = NULL, 626 .attrs = (struct attribute **)netdev_sysfs_attrs, 627 }; 628 629 static const struct net_device_ops softing_netdev_ops = { 630 .ndo_open = softing_netdev_open, 631 .ndo_stop = softing_netdev_stop, 632 .ndo_start_xmit = softing_netdev_start_xmit, 633 }; 634 635 static const struct can_bittiming_const softing_btr_const = { 636 .name = "softing", 637 .tseg1_min = 1, 638 .tseg1_max = 16, 639 .tseg2_min = 1, 640 .tseg2_max = 8, 641 .sjw_max = 4, /* overruled */ 642 .brp_min = 1, 643 .brp_max = 32, /* overruled */ 644 .brp_inc = 1, 645 }; 646 647 648 static struct net_device *softing_netdev_create(struct softing *card, 649 uint16_t chip_id) 650 { 651 struct net_device *netdev; 652 struct softing_priv *priv; 653 654 netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX); 655 if (!netdev) { 656 dev_alert(&card->pdev->dev, "alloc_candev failed\n"); 657 return NULL; 658 } 659 priv = netdev_priv(netdev); 660 priv->netdev = netdev; 661 priv->card = card; 662 memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const)); 663 priv->btr_const.brp_max = card->pdat->max_brp; 664 priv->btr_const.sjw_max = card->pdat->max_sjw; 665 priv->can.bittiming_const = &priv->btr_const; 666 priv->can.clock.freq = 8000000; 667 priv->chip = chip_id; 668 priv->output = softing_default_output(netdev); 669 SET_NETDEV_DEV(netdev, &card->pdev->dev); 670 671 netdev->flags |= IFF_ECHO; 672 netdev->netdev_ops = &softing_netdev_ops; 673 priv->can.do_set_mode = softing_candev_set_mode; 674 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; 675 676 return netdev; 677 } 678 679 static int softing_netdev_register(struct net_device *netdev) 680 { 681 int ret; 682 683 netdev->sysfs_groups[0] = &netdev_sysfs_group; 684 ret = register_candev(netdev); 685 if (ret) { 686 dev_alert(&netdev->dev, "register failed\n"); 687 return ret; 688 } 689 return 0; 690 } 691 692 static void softing_netdev_cleanup(struct net_device *netdev) 693 { 694 unregister_candev(netdev); 695 free_candev(netdev); 696 } 697 698 /* 699 * sysfs for Platform device 700 */ 701 #define DEV_ATTR_RO(name, member) \ 702 static ssize_t show_##name(struct device *dev, \ 703 struct device_attribute *attr, char *buf) \ 704 { \ 705 struct softing *card = platform_get_drvdata(to_platform_device(dev)); \ 706 return sprintf(buf, "%u\n", card->member); \ 707 } \ 708 static DEVICE_ATTR(name, 0444, show_##name, NULL) 709 710 #define DEV_ATTR_RO_STR(name, member) \ 711 static ssize_t show_##name(struct device *dev, \ 712 struct device_attribute *attr, char *buf) \ 713 { \ 714 struct softing *card = platform_get_drvdata(to_platform_device(dev)); \ 715 return sprintf(buf, "%s\n", card->member); \ 716 } \ 717 static DEVICE_ATTR(name, 0444, show_##name, NULL) 718 719 DEV_ATTR_RO(serial, id.serial); 720 DEV_ATTR_RO_STR(firmware, pdat->app.fw); 721 DEV_ATTR_RO(firmware_version, id.fw_version); 722 DEV_ATTR_RO_STR(hardware, pdat->name); 723 DEV_ATTR_RO(hardware_version, id.hw_version); 724 DEV_ATTR_RO(license, id.license); 725 DEV_ATTR_RO(frequency, id.freq); 726 DEV_ATTR_RO(txpending, tx.pending); 727 728 static struct attribute *softing_pdev_attrs[] = { 729 &dev_attr_serial.attr, 730 &dev_attr_firmware.attr, 731 &dev_attr_firmware_version.attr, 732 &dev_attr_hardware.attr, 733 &dev_attr_hardware_version.attr, 734 &dev_attr_license.attr, 735 &dev_attr_frequency.attr, 736 &dev_attr_txpending.attr, 737 NULL, 738 }; 739 740 static const struct attribute_group softing_pdev_group = { 741 .name = NULL, 742 .attrs = softing_pdev_attrs, 743 }; 744 745 /* 746 * platform driver 747 */ 748 static int softing_pdev_remove(struct platform_device *pdev) 749 { 750 struct softing *card = platform_get_drvdata(pdev); 751 int j; 752 753 /* first, disable card*/ 754 softing_card_shutdown(card); 755 756 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 757 if (!card->net[j]) 758 continue; 759 softing_netdev_cleanup(card->net[j]); 760 card->net[j] = NULL; 761 } 762 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group); 763 764 iounmap(card->dpram); 765 kfree(card); 766 return 0; 767 } 768 769 static int softing_pdev_probe(struct platform_device *pdev) 770 { 771 const struct softing_platform_data *pdat = pdev->dev.platform_data; 772 struct softing *card; 773 struct net_device *netdev; 774 struct softing_priv *priv; 775 struct resource *pres; 776 int ret; 777 int j; 778 779 if (!pdat) { 780 dev_warn(&pdev->dev, "no platform data\n"); 781 return -EINVAL; 782 } 783 if (pdat->nbus > ARRAY_SIZE(card->net)) { 784 dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus); 785 return -EINVAL; 786 } 787 788 card = kzalloc(sizeof(*card), GFP_KERNEL); 789 if (!card) 790 return -ENOMEM; 791 card->pdat = pdat; 792 card->pdev = pdev; 793 platform_set_drvdata(pdev, card); 794 mutex_init(&card->fw.lock); 795 spin_lock_init(&card->spin); 796 797 ret = -EINVAL; 798 pres = platform_get_resource(pdev, IORESOURCE_MEM, 0); 799 if (!pres) 800 goto platform_resource_failed; 801 card->dpram_phys = pres->start; 802 card->dpram_size = resource_size(pres); 803 card->dpram = ioremap_nocache(card->dpram_phys, card->dpram_size); 804 if (!card->dpram) { 805 dev_alert(&card->pdev->dev, "dpram ioremap failed\n"); 806 goto ioremap_failed; 807 } 808 809 pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 810 if (pres) 811 card->irq.nr = pres->start; 812 813 /* reset card */ 814 ret = softing_card_boot(card); 815 if (ret < 0) { 816 dev_alert(&pdev->dev, "failed to boot\n"); 817 goto boot_failed; 818 } 819 820 /* only now, the chip's are known */ 821 card->id.freq = card->pdat->freq; 822 823 ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group); 824 if (ret < 0) { 825 dev_alert(&card->pdev->dev, "sysfs failed\n"); 826 goto sysfs_failed; 827 } 828 829 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 830 card->net[j] = netdev = 831 softing_netdev_create(card, card->id.chip[j]); 832 if (!netdev) { 833 dev_alert(&pdev->dev, "failed to make can[%i]", j); 834 ret = -ENOMEM; 835 goto netdev_failed; 836 } 837 priv = netdev_priv(card->net[j]); 838 priv->index = j; 839 ret = softing_netdev_register(netdev); 840 if (ret) { 841 free_candev(netdev); 842 card->net[j] = NULL; 843 dev_alert(&card->pdev->dev, 844 "failed to register can[%i]\n", j); 845 goto netdev_failed; 846 } 847 } 848 dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name); 849 return 0; 850 851 netdev_failed: 852 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 853 if (!card->net[j]) 854 continue; 855 softing_netdev_cleanup(card->net[j]); 856 } 857 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group); 858 sysfs_failed: 859 softing_card_shutdown(card); 860 boot_failed: 861 iounmap(card->dpram); 862 ioremap_failed: 863 platform_resource_failed: 864 kfree(card); 865 return ret; 866 } 867 868 static struct platform_driver softing_driver = { 869 .driver = { 870 .name = "softing", 871 .owner = THIS_MODULE, 872 }, 873 .probe = softing_pdev_probe, 874 .remove = softing_pdev_remove, 875 }; 876 877 module_platform_driver(softing_driver); 878 879 MODULE_ALIAS("platform:softing"); 880 MODULE_DESCRIPTION("Softing DPRAM CAN driver"); 881 MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>"); 882 MODULE_LICENSE("GPL v2"); 883