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/init.h> 21 #include <linux/interrupt.h> 22 #include <asm/io.h> 23 24 #include "softing.h" 25 26 #define TX_ECHO_SKB_MAX (((TXMAX+1)/2)-1) 27 28 /* 29 * test is a specific CAN netdev 30 * is online (ie. up 'n running, not sleeping, not busoff 31 */ 32 static inline int canif_is_active(struct net_device *netdev) 33 { 34 struct can_priv *can = netdev_priv(netdev); 35 36 if (!netif_running(netdev)) 37 return 0; 38 return (can->state <= CAN_STATE_ERROR_PASSIVE); 39 } 40 41 /* reset DPRAM */ 42 static inline void softing_set_reset_dpram(struct softing *card) 43 { 44 if (card->pdat->generation >= 2) { 45 spin_lock_bh(&card->spin); 46 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) & ~1, 47 &card->dpram[DPRAM_V2_RESET]); 48 spin_unlock_bh(&card->spin); 49 } 50 } 51 52 static inline void softing_clr_reset_dpram(struct softing *card) 53 { 54 if (card->pdat->generation >= 2) { 55 spin_lock_bh(&card->spin); 56 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) | 1, 57 &card->dpram[DPRAM_V2_RESET]); 58 spin_unlock_bh(&card->spin); 59 } 60 } 61 62 /* trigger the tx queue-ing */ 63 static netdev_tx_t softing_netdev_start_xmit(struct sk_buff *skb, 64 struct net_device *dev) 65 { 66 struct softing_priv *priv = netdev_priv(dev); 67 struct softing *card = priv->card; 68 int ret; 69 uint8_t *ptr; 70 uint8_t fifo_wr, fifo_rd; 71 struct can_frame *cf = (struct can_frame *)skb->data; 72 uint8_t buf[DPRAM_TX_SIZE]; 73 74 if (can_dropped_invalid_skb(dev, skb)) 75 return NETDEV_TX_OK; 76 77 spin_lock(&card->spin); 78 79 ret = NETDEV_TX_BUSY; 80 if (!card->fw.up || 81 (card->tx.pending >= TXMAX) || 82 (priv->tx.pending >= TX_ECHO_SKB_MAX)) 83 goto xmit_done; 84 fifo_wr = ioread8(&card->dpram[DPRAM_TX_WR]); 85 fifo_rd = ioread8(&card->dpram[DPRAM_TX_RD]); 86 if (fifo_wr == fifo_rd) 87 /* fifo full */ 88 goto xmit_done; 89 memset(buf, 0, sizeof(buf)); 90 ptr = buf; 91 *ptr = CMD_TX; 92 if (cf->can_id & CAN_RTR_FLAG) 93 *ptr |= CMD_RTR; 94 if (cf->can_id & CAN_EFF_FLAG) 95 *ptr |= CMD_XTD; 96 if (priv->index) 97 *ptr |= CMD_BUS2; 98 ++ptr; 99 *ptr++ = cf->can_dlc; 100 *ptr++ = (cf->can_id >> 0); 101 *ptr++ = (cf->can_id >> 8); 102 if (cf->can_id & CAN_EFF_FLAG) { 103 *ptr++ = (cf->can_id >> 16); 104 *ptr++ = (cf->can_id >> 24); 105 } else { 106 /* increment 1, not 2 as you might think */ 107 ptr += 1; 108 } 109 if (!(cf->can_id & CAN_RTR_FLAG)) 110 memcpy(ptr, &cf->data[0], cf->can_dlc); 111 memcpy_toio(&card->dpram[DPRAM_TX + DPRAM_TX_SIZE * fifo_wr], 112 buf, DPRAM_TX_SIZE); 113 if (++fifo_wr >= DPRAM_TX_CNT) 114 fifo_wr = 0; 115 iowrite8(fifo_wr, &card->dpram[DPRAM_TX_WR]); 116 card->tx.last_bus = priv->index; 117 ++card->tx.pending; 118 ++priv->tx.pending; 119 can_put_echo_skb(skb, dev, priv->tx.echo_put); 120 ++priv->tx.echo_put; 121 if (priv->tx.echo_put >= TX_ECHO_SKB_MAX) 122 priv->tx.echo_put = 0; 123 /* can_put_echo_skb() saves the skb, safe to return TX_OK */ 124 ret = NETDEV_TX_OK; 125 xmit_done: 126 spin_unlock(&card->spin); 127 if (card->tx.pending >= TXMAX) { 128 int j; 129 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 130 if (card->net[j]) 131 netif_stop_queue(card->net[j]); 132 } 133 } 134 if (ret != NETDEV_TX_OK) 135 netif_stop_queue(dev); 136 137 return ret; 138 } 139 140 /* 141 * shortcut for skb delivery 142 */ 143 int softing_netdev_rx(struct net_device *netdev, const struct can_frame *msg, 144 ktime_t ktime) 145 { 146 struct sk_buff *skb; 147 struct can_frame *cf; 148 149 skb = alloc_can_skb(netdev, &cf); 150 if (!skb) 151 return -ENOMEM; 152 memcpy(cf, msg, sizeof(*msg)); 153 skb->tstamp = ktime; 154 return netif_rx(skb); 155 } 156 157 /* 158 * softing_handle_1 159 * pop 1 entry from the DPRAM queue, and process 160 */ 161 static int softing_handle_1(struct softing *card) 162 { 163 struct net_device *netdev; 164 struct softing_priv *priv; 165 ktime_t ktime; 166 struct can_frame msg; 167 int cnt = 0, lost_msg; 168 uint8_t fifo_rd, fifo_wr, cmd; 169 uint8_t *ptr; 170 uint32_t tmp_u32; 171 uint8_t buf[DPRAM_RX_SIZE]; 172 173 memset(&msg, 0, sizeof(msg)); 174 /* test for lost msgs */ 175 lost_msg = ioread8(&card->dpram[DPRAM_RX_LOST]); 176 if (lost_msg) { 177 int j; 178 /* reset condition */ 179 iowrite8(0, &card->dpram[DPRAM_RX_LOST]); 180 /* prepare msg */ 181 msg.can_id = CAN_ERR_FLAG | CAN_ERR_CRTL; 182 msg.can_dlc = CAN_ERR_DLC; 183 msg.data[1] = CAN_ERR_CRTL_RX_OVERFLOW; 184 /* 185 * service to all busses, we don't know which it was applicable 186 * but only service busses that are online 187 */ 188 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 189 netdev = card->net[j]; 190 if (!netdev) 191 continue; 192 if (!canif_is_active(netdev)) 193 /* a dead bus has no overflows */ 194 continue; 195 ++netdev->stats.rx_over_errors; 196 softing_netdev_rx(netdev, &msg, ktime_set(0, 0)); 197 } 198 /* prepare for other use */ 199 memset(&msg, 0, sizeof(msg)); 200 ++cnt; 201 } 202 203 fifo_rd = ioread8(&card->dpram[DPRAM_RX_RD]); 204 fifo_wr = ioread8(&card->dpram[DPRAM_RX_WR]); 205 206 if (++fifo_rd >= DPRAM_RX_CNT) 207 fifo_rd = 0; 208 if (fifo_wr == fifo_rd) 209 return cnt; 210 211 memcpy_fromio(buf, &card->dpram[DPRAM_RX + DPRAM_RX_SIZE*fifo_rd], 212 DPRAM_RX_SIZE); 213 mb(); 214 /* trigger dual port RAM */ 215 iowrite8(fifo_rd, &card->dpram[DPRAM_RX_RD]); 216 217 ptr = buf; 218 cmd = *ptr++; 219 if (cmd == 0xff) 220 /* not quite useful, probably the card has got out */ 221 return 0; 222 netdev = card->net[0]; 223 if (cmd & CMD_BUS2) 224 netdev = card->net[1]; 225 priv = netdev_priv(netdev); 226 227 if (cmd & CMD_ERR) { 228 uint8_t can_state, state; 229 230 state = *ptr++; 231 232 msg.can_id = CAN_ERR_FLAG; 233 msg.can_dlc = CAN_ERR_DLC; 234 235 if (state & SF_MASK_BUSOFF) { 236 can_state = CAN_STATE_BUS_OFF; 237 msg.can_id |= CAN_ERR_BUSOFF; 238 state = STATE_BUSOFF; 239 } else if (state & SF_MASK_EPASSIVE) { 240 can_state = CAN_STATE_ERROR_PASSIVE; 241 msg.can_id |= CAN_ERR_CRTL; 242 msg.data[1] = CAN_ERR_CRTL_TX_PASSIVE; 243 state = STATE_EPASSIVE; 244 } else { 245 can_state = CAN_STATE_ERROR_ACTIVE; 246 msg.can_id |= CAN_ERR_CRTL; 247 state = STATE_EACTIVE; 248 } 249 /* update DPRAM */ 250 iowrite8(state, &card->dpram[priv->index ? 251 DPRAM_INFO_BUSSTATE2 : DPRAM_INFO_BUSSTATE]); 252 /* timestamp */ 253 tmp_u32 = le32_to_cpup((void *)ptr); 254 ptr += 4; 255 ktime = softing_raw2ktime(card, tmp_u32); 256 257 ++netdev->stats.rx_errors; 258 /* update internal status */ 259 if (can_state != priv->can.state) { 260 priv->can.state = can_state; 261 if (can_state == CAN_STATE_ERROR_PASSIVE) 262 ++priv->can.can_stats.error_passive; 263 else if (can_state == CAN_STATE_BUS_OFF) { 264 /* this calls can_close_cleanup() */ 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_channel(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->index); 567 } 568 569 static ssize_t show_chip(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, "%i\n", priv->chip); 576 } 577 578 static ssize_t show_output(struct device *dev, struct device_attribute *attr, 579 char *buf) 580 { 581 struct net_device *ndev = to_net_dev(dev); 582 struct softing_priv *priv = netdev2softing(ndev); 583 584 return sprintf(buf, "0x%02x\n", priv->output); 585 } 586 587 static ssize_t store_output(struct device *dev, struct device_attribute *attr, 588 const char *buf, size_t count) 589 { 590 struct net_device *ndev = to_net_dev(dev); 591 struct softing_priv *priv = netdev2softing(ndev); 592 struct softing *card = priv->card; 593 unsigned long val; 594 int ret; 595 596 ret = kstrtoul(buf, 0, &val); 597 if (ret < 0) 598 return ret; 599 val &= 0xFF; 600 601 ret = mutex_lock_interruptible(&card->fw.lock); 602 if (ret) 603 return -ERESTARTSYS; 604 if (netif_running(ndev)) { 605 mutex_unlock(&card->fw.lock); 606 return -EBUSY; 607 } 608 priv->output = val; 609 mutex_unlock(&card->fw.lock); 610 return count; 611 } 612 613 static const DEVICE_ATTR(channel, S_IRUGO, show_channel, NULL); 614 static const DEVICE_ATTR(chip, S_IRUGO, show_chip, NULL); 615 static const DEVICE_ATTR(output, S_IRUGO | S_IWUSR, show_output, store_output); 616 617 static const struct attribute *const netdev_sysfs_attrs[] = { 618 &dev_attr_channel.attr, 619 &dev_attr_chip.attr, 620 &dev_attr_output.attr, 621 NULL, 622 }; 623 static const struct attribute_group netdev_sysfs_group = { 624 .name = NULL, 625 .attrs = (struct attribute **)netdev_sysfs_attrs, 626 }; 627 628 static const struct net_device_ops softing_netdev_ops = { 629 .ndo_open = softing_netdev_open, 630 .ndo_stop = softing_netdev_stop, 631 .ndo_start_xmit = softing_netdev_start_xmit, 632 }; 633 634 static const struct can_bittiming_const softing_btr_const = { 635 .name = "softing", 636 .tseg1_min = 1, 637 .tseg1_max = 16, 638 .tseg2_min = 1, 639 .tseg2_max = 8, 640 .sjw_max = 4, /* overruled */ 641 .brp_min = 1, 642 .brp_max = 32, /* overruled */ 643 .brp_inc = 1, 644 }; 645 646 647 static struct net_device *softing_netdev_create(struct softing *card, 648 uint16_t chip_id) 649 { 650 struct net_device *netdev; 651 struct softing_priv *priv; 652 653 netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX); 654 if (!netdev) { 655 dev_alert(&card->pdev->dev, "alloc_candev failed\n"); 656 return NULL; 657 } 658 priv = netdev_priv(netdev); 659 priv->netdev = netdev; 660 priv->card = card; 661 memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const)); 662 priv->btr_const.brp_max = card->pdat->max_brp; 663 priv->btr_const.sjw_max = card->pdat->max_sjw; 664 priv->can.bittiming_const = &priv->btr_const; 665 priv->can.clock.freq = 8000000; 666 priv->chip = chip_id; 667 priv->output = softing_default_output(netdev); 668 SET_NETDEV_DEV(netdev, &card->pdev->dev); 669 670 netdev->flags |= IFF_ECHO; 671 netdev->netdev_ops = &softing_netdev_ops; 672 priv->can.do_set_mode = softing_candev_set_mode; 673 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; 674 675 return netdev; 676 } 677 678 static int softing_netdev_register(struct net_device *netdev) 679 { 680 int ret; 681 682 netdev->sysfs_groups[0] = &netdev_sysfs_group; 683 ret = register_candev(netdev); 684 if (ret) { 685 dev_alert(&netdev->dev, "register failed\n"); 686 return ret; 687 } 688 return 0; 689 } 690 691 static void softing_netdev_cleanup(struct net_device *netdev) 692 { 693 unregister_candev(netdev); 694 free_candev(netdev); 695 } 696 697 /* 698 * sysfs for Platform device 699 */ 700 #define DEV_ATTR_RO(name, member) \ 701 static ssize_t show_##name(struct device *dev, \ 702 struct device_attribute *attr, char *buf) \ 703 { \ 704 struct softing *card = platform_get_drvdata(to_platform_device(dev)); \ 705 return sprintf(buf, "%u\n", card->member); \ 706 } \ 707 static DEVICE_ATTR(name, 0444, show_##name, NULL) 708 709 #define DEV_ATTR_RO_STR(name, member) \ 710 static ssize_t show_##name(struct device *dev, \ 711 struct device_attribute *attr, char *buf) \ 712 { \ 713 struct softing *card = platform_get_drvdata(to_platform_device(dev)); \ 714 return sprintf(buf, "%s\n", card->member); \ 715 } \ 716 static DEVICE_ATTR(name, 0444, show_##name, NULL) 717 718 DEV_ATTR_RO(serial, id.serial); 719 DEV_ATTR_RO_STR(firmware, pdat->app.fw); 720 DEV_ATTR_RO(firmware_version, id.fw_version); 721 DEV_ATTR_RO_STR(hardware, pdat->name); 722 DEV_ATTR_RO(hardware_version, id.hw_version); 723 DEV_ATTR_RO(license, id.license); 724 DEV_ATTR_RO(frequency, id.freq); 725 DEV_ATTR_RO(txpending, tx.pending); 726 727 static struct attribute *softing_pdev_attrs[] = { 728 &dev_attr_serial.attr, 729 &dev_attr_firmware.attr, 730 &dev_attr_firmware_version.attr, 731 &dev_attr_hardware.attr, 732 &dev_attr_hardware_version.attr, 733 &dev_attr_license.attr, 734 &dev_attr_frequency.attr, 735 &dev_attr_txpending.attr, 736 NULL, 737 }; 738 739 static const struct attribute_group softing_pdev_group = { 740 .name = NULL, 741 .attrs = softing_pdev_attrs, 742 }; 743 744 /* 745 * platform driver 746 */ 747 static int softing_pdev_remove(struct platform_device *pdev) 748 { 749 struct softing *card = platform_get_drvdata(pdev); 750 int j; 751 752 /* first, disable card*/ 753 softing_card_shutdown(card); 754 755 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 756 if (!card->net[j]) 757 continue; 758 softing_netdev_cleanup(card->net[j]); 759 card->net[j] = NULL; 760 } 761 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group); 762 763 iounmap(card->dpram); 764 kfree(card); 765 return 0; 766 } 767 768 static int softing_pdev_probe(struct platform_device *pdev) 769 { 770 const struct softing_platform_data *pdat = dev_get_platdata(&pdev->dev); 771 struct softing *card; 772 struct net_device *netdev; 773 struct softing_priv *priv; 774 struct resource *pres; 775 int ret; 776 int j; 777 778 if (!pdat) { 779 dev_warn(&pdev->dev, "no platform data\n"); 780 return -EINVAL; 781 } 782 if (pdat->nbus > ARRAY_SIZE(card->net)) { 783 dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus); 784 return -EINVAL; 785 } 786 787 card = kzalloc(sizeof(*card), GFP_KERNEL); 788 if (!card) 789 return -ENOMEM; 790 card->pdat = pdat; 791 card->pdev = pdev; 792 platform_set_drvdata(pdev, card); 793 mutex_init(&card->fw.lock); 794 spin_lock_init(&card->spin); 795 796 ret = -EINVAL; 797 pres = platform_get_resource(pdev, IORESOURCE_MEM, 0); 798 if (!pres) 799 goto platform_resource_failed; 800 card->dpram_phys = pres->start; 801 card->dpram_size = resource_size(pres); 802 card->dpram = ioremap_nocache(card->dpram_phys, card->dpram_size); 803 if (!card->dpram) { 804 dev_alert(&card->pdev->dev, "dpram ioremap failed\n"); 805 goto ioremap_failed; 806 } 807 808 pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 809 if (pres) 810 card->irq.nr = pres->start; 811 812 /* reset card */ 813 ret = softing_card_boot(card); 814 if (ret < 0) { 815 dev_alert(&pdev->dev, "failed to boot\n"); 816 goto boot_failed; 817 } 818 819 /* only now, the chip's are known */ 820 card->id.freq = card->pdat->freq; 821 822 ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group); 823 if (ret < 0) { 824 dev_alert(&card->pdev->dev, "sysfs failed\n"); 825 goto sysfs_failed; 826 } 827 828 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 829 card->net[j] = netdev = 830 softing_netdev_create(card, card->id.chip[j]); 831 if (!netdev) { 832 dev_alert(&pdev->dev, "failed to make can[%i]", j); 833 ret = -ENOMEM; 834 goto netdev_failed; 835 } 836 priv = netdev_priv(card->net[j]); 837 priv->index = j; 838 ret = softing_netdev_register(netdev); 839 if (ret) { 840 free_candev(netdev); 841 card->net[j] = NULL; 842 dev_alert(&card->pdev->dev, 843 "failed to register can[%i]\n", j); 844 goto netdev_failed; 845 } 846 } 847 dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name); 848 return 0; 849 850 netdev_failed: 851 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 852 if (!card->net[j]) 853 continue; 854 softing_netdev_cleanup(card->net[j]); 855 } 856 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group); 857 sysfs_failed: 858 softing_card_shutdown(card); 859 boot_failed: 860 iounmap(card->dpram); 861 ioremap_failed: 862 platform_resource_failed: 863 kfree(card); 864 return ret; 865 } 866 867 static struct platform_driver softing_driver = { 868 .driver = { 869 .name = "softing", 870 .owner = THIS_MODULE, 871 }, 872 .probe = softing_pdev_probe, 873 .remove = softing_pdev_remove, 874 }; 875 876 module_platform_driver(softing_driver); 877 878 MODULE_ALIAS("platform:softing"); 879 MODULE_DESCRIPTION("Softing DPRAM CAN driver"); 880 MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>"); 881 MODULE_LICENSE("GPL v2"); 882