1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2008-2010 4 * 5 * - Kurt Van Dijck, EIA Electronics 6 */ 7 8 #include <linux/module.h> 9 #include <linux/interrupt.h> 10 #include <asm/io.h> 11 12 #include "softing.h" 13 14 #define TX_ECHO_SKB_MAX (((TXMAX+1)/2)-1) 15 16 /* 17 * test is a specific CAN netdev 18 * is online (ie. up 'n running, not sleeping, not busoff 19 */ 20 static inline int canif_is_active(struct net_device *netdev) 21 { 22 struct can_priv *can = netdev_priv(netdev); 23 24 if (!netif_running(netdev)) 25 return 0; 26 return (can->state <= CAN_STATE_ERROR_PASSIVE); 27 } 28 29 /* reset DPRAM */ 30 static inline void softing_set_reset_dpram(struct softing *card) 31 { 32 if (card->pdat->generation >= 2) { 33 spin_lock_bh(&card->spin); 34 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) & ~1, 35 &card->dpram[DPRAM_V2_RESET]); 36 spin_unlock_bh(&card->spin); 37 } 38 } 39 40 static inline void softing_clr_reset_dpram(struct softing *card) 41 { 42 if (card->pdat->generation >= 2) { 43 spin_lock_bh(&card->spin); 44 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) | 1, 45 &card->dpram[DPRAM_V2_RESET]); 46 spin_unlock_bh(&card->spin); 47 } 48 } 49 50 /* trigger the tx queue-ing */ 51 static netdev_tx_t softing_netdev_start_xmit(struct sk_buff *skb, 52 struct net_device *dev) 53 { 54 struct softing_priv *priv = netdev_priv(dev); 55 struct softing *card = priv->card; 56 int ret; 57 uint8_t *ptr; 58 uint8_t fifo_wr, fifo_rd; 59 struct can_frame *cf = (struct can_frame *)skb->data; 60 uint8_t buf[DPRAM_TX_SIZE]; 61 62 if (can_dropped_invalid_skb(dev, skb)) 63 return NETDEV_TX_OK; 64 65 spin_lock(&card->spin); 66 67 ret = NETDEV_TX_BUSY; 68 if (!card->fw.up || 69 (card->tx.pending >= TXMAX) || 70 (priv->tx.pending >= TX_ECHO_SKB_MAX)) 71 goto xmit_done; 72 fifo_wr = ioread8(&card->dpram[DPRAM_TX_WR]); 73 fifo_rd = ioread8(&card->dpram[DPRAM_TX_RD]); 74 if (fifo_wr == fifo_rd) 75 /* fifo full */ 76 goto xmit_done; 77 memset(buf, 0, sizeof(buf)); 78 ptr = buf; 79 *ptr = CMD_TX; 80 if (cf->can_id & CAN_RTR_FLAG) 81 *ptr |= CMD_RTR; 82 if (cf->can_id & CAN_EFF_FLAG) 83 *ptr |= CMD_XTD; 84 if (priv->index) 85 *ptr |= CMD_BUS2; 86 ++ptr; 87 *ptr++ = cf->len; 88 *ptr++ = (cf->can_id >> 0); 89 *ptr++ = (cf->can_id >> 8); 90 if (cf->can_id & CAN_EFF_FLAG) { 91 *ptr++ = (cf->can_id >> 16); 92 *ptr++ = (cf->can_id >> 24); 93 } else { 94 /* increment 1, not 2 as you might think */ 95 ptr += 1; 96 } 97 if (!(cf->can_id & CAN_RTR_FLAG)) 98 memcpy(ptr, &cf->data[0], cf->len); 99 memcpy_toio(&card->dpram[DPRAM_TX + DPRAM_TX_SIZE * fifo_wr], 100 buf, DPRAM_TX_SIZE); 101 if (++fifo_wr >= DPRAM_TX_CNT) 102 fifo_wr = 0; 103 iowrite8(fifo_wr, &card->dpram[DPRAM_TX_WR]); 104 card->tx.last_bus = priv->index; 105 ++card->tx.pending; 106 ++priv->tx.pending; 107 can_put_echo_skb(skb, dev, priv->tx.echo_put, 0); 108 ++priv->tx.echo_put; 109 if (priv->tx.echo_put >= TX_ECHO_SKB_MAX) 110 priv->tx.echo_put = 0; 111 /* can_put_echo_skb() saves the skb, safe to return TX_OK */ 112 ret = NETDEV_TX_OK; 113 xmit_done: 114 spin_unlock(&card->spin); 115 if (card->tx.pending >= TXMAX) { 116 int j; 117 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 118 if (card->net[j]) 119 netif_stop_queue(card->net[j]); 120 } 121 } 122 if (ret != NETDEV_TX_OK) 123 netif_stop_queue(dev); 124 125 return ret; 126 } 127 128 /* 129 * shortcut for skb delivery 130 */ 131 int softing_netdev_rx(struct net_device *netdev, const struct can_frame *msg, 132 ktime_t ktime) 133 { 134 struct sk_buff *skb; 135 struct can_frame *cf; 136 137 skb = alloc_can_skb(netdev, &cf); 138 if (!skb) 139 return -ENOMEM; 140 memcpy(cf, msg, sizeof(*msg)); 141 skb->tstamp = ktime; 142 return netif_rx(skb); 143 } 144 145 /* 146 * softing_handle_1 147 * pop 1 entry from the DPRAM queue, and process 148 */ 149 static int softing_handle_1(struct softing *card) 150 { 151 struct net_device *netdev; 152 struct softing_priv *priv; 153 ktime_t ktime; 154 struct can_frame msg; 155 int cnt = 0, lost_msg; 156 uint8_t fifo_rd, fifo_wr, cmd; 157 uint8_t *ptr; 158 uint32_t tmp_u32; 159 uint8_t buf[DPRAM_RX_SIZE]; 160 161 memset(&msg, 0, sizeof(msg)); 162 /* test for lost msgs */ 163 lost_msg = ioread8(&card->dpram[DPRAM_RX_LOST]); 164 if (lost_msg) { 165 int j; 166 /* reset condition */ 167 iowrite8(0, &card->dpram[DPRAM_RX_LOST]); 168 /* prepare msg */ 169 msg.can_id = CAN_ERR_FLAG | CAN_ERR_CRTL; 170 msg.len = CAN_ERR_DLC; 171 msg.data[1] = CAN_ERR_CRTL_RX_OVERFLOW; 172 /* 173 * service to all buses, we don't know which it was applicable 174 * but only service buses that are online 175 */ 176 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 177 netdev = card->net[j]; 178 if (!netdev) 179 continue; 180 if (!canif_is_active(netdev)) 181 /* a dead bus has no overflows */ 182 continue; 183 ++netdev->stats.rx_over_errors; 184 softing_netdev_rx(netdev, &msg, 0); 185 } 186 /* prepare for other use */ 187 memset(&msg, 0, sizeof(msg)); 188 ++cnt; 189 } 190 191 fifo_rd = ioread8(&card->dpram[DPRAM_RX_RD]); 192 fifo_wr = ioread8(&card->dpram[DPRAM_RX_WR]); 193 194 if (++fifo_rd >= DPRAM_RX_CNT) 195 fifo_rd = 0; 196 if (fifo_wr == fifo_rd) 197 return cnt; 198 199 memcpy_fromio(buf, &card->dpram[DPRAM_RX + DPRAM_RX_SIZE*fifo_rd], 200 DPRAM_RX_SIZE); 201 mb(); 202 /* trigger dual port RAM */ 203 iowrite8(fifo_rd, &card->dpram[DPRAM_RX_RD]); 204 205 ptr = buf; 206 cmd = *ptr++; 207 if (cmd == 0xff) 208 /* not quite useful, probably the card has got out */ 209 return 0; 210 netdev = card->net[0]; 211 if (cmd & CMD_BUS2) 212 netdev = card->net[1]; 213 priv = netdev_priv(netdev); 214 215 if (cmd & CMD_ERR) { 216 uint8_t can_state, state; 217 218 state = *ptr++; 219 220 msg.can_id = CAN_ERR_FLAG; 221 msg.len = CAN_ERR_DLC; 222 223 if (state & SF_MASK_BUSOFF) { 224 can_state = CAN_STATE_BUS_OFF; 225 msg.can_id |= CAN_ERR_BUSOFF; 226 state = STATE_BUSOFF; 227 } else if (state & SF_MASK_EPASSIVE) { 228 can_state = CAN_STATE_ERROR_PASSIVE; 229 msg.can_id |= CAN_ERR_CRTL; 230 msg.data[1] = CAN_ERR_CRTL_TX_PASSIVE; 231 state = STATE_EPASSIVE; 232 } else { 233 can_state = CAN_STATE_ERROR_ACTIVE; 234 msg.can_id |= CAN_ERR_CRTL; 235 state = STATE_EACTIVE; 236 } 237 /* update DPRAM */ 238 iowrite8(state, &card->dpram[priv->index ? 239 DPRAM_INFO_BUSSTATE2 : DPRAM_INFO_BUSSTATE]); 240 /* timestamp */ 241 tmp_u32 = le32_to_cpup((void *)ptr); 242 ktime = softing_raw2ktime(card, tmp_u32); 243 244 ++netdev->stats.rx_errors; 245 /* update internal status */ 246 if (can_state != priv->can.state) { 247 priv->can.state = can_state; 248 if (can_state == CAN_STATE_ERROR_PASSIVE) 249 ++priv->can.can_stats.error_passive; 250 else if (can_state == CAN_STATE_BUS_OFF) { 251 /* this calls can_close_cleanup() */ 252 ++priv->can.can_stats.bus_off; 253 can_bus_off(netdev); 254 netif_stop_queue(netdev); 255 } 256 /* trigger socketcan */ 257 softing_netdev_rx(netdev, &msg, ktime); 258 } 259 260 } else { 261 if (cmd & CMD_RTR) 262 msg.can_id |= CAN_RTR_FLAG; 263 msg.len = can_cc_dlc2len(*ptr++); 264 if (cmd & CMD_XTD) { 265 msg.can_id |= CAN_EFF_FLAG; 266 msg.can_id |= le32_to_cpup((void *)ptr); 267 ptr += 4; 268 } else { 269 msg.can_id |= le16_to_cpup((void *)ptr); 270 ptr += 2; 271 } 272 /* timestamp */ 273 tmp_u32 = le32_to_cpup((void *)ptr); 274 ptr += 4; 275 ktime = softing_raw2ktime(card, tmp_u32); 276 if (!(msg.can_id & CAN_RTR_FLAG)) 277 memcpy(&msg.data[0], ptr, 8); 278 /* update socket */ 279 if (cmd & CMD_ACK) { 280 /* acknowledge, was tx msg */ 281 struct sk_buff *skb; 282 skb = priv->can.echo_skb[priv->tx.echo_get]; 283 if (skb) 284 skb->tstamp = ktime; 285 can_get_echo_skb(netdev, priv->tx.echo_get, NULL); 286 ++priv->tx.echo_get; 287 if (priv->tx.echo_get >= TX_ECHO_SKB_MAX) 288 priv->tx.echo_get = 0; 289 if (priv->tx.pending) 290 --priv->tx.pending; 291 if (card->tx.pending) 292 --card->tx.pending; 293 ++netdev->stats.tx_packets; 294 if (!(msg.can_id & CAN_RTR_FLAG)) 295 netdev->stats.tx_bytes += msg.len; 296 } else { 297 int ret; 298 299 ret = softing_netdev_rx(netdev, &msg, ktime); 300 if (ret == NET_RX_SUCCESS) { 301 ++netdev->stats.rx_packets; 302 if (!(msg.can_id & CAN_RTR_FLAG)) 303 netdev->stats.rx_bytes += msg.len; 304 } else { 305 ++netdev->stats.rx_dropped; 306 } 307 } 308 } 309 ++cnt; 310 return cnt; 311 } 312 313 /* 314 * real interrupt handler 315 */ 316 static irqreturn_t softing_irq_thread(int irq, void *dev_id) 317 { 318 struct softing *card = (struct softing *)dev_id; 319 struct net_device *netdev; 320 struct softing_priv *priv; 321 int j, offset, work_done; 322 323 work_done = 0; 324 spin_lock_bh(&card->spin); 325 while (softing_handle_1(card) > 0) { 326 ++card->irq.svc_count; 327 ++work_done; 328 } 329 spin_unlock_bh(&card->spin); 330 /* resume tx queue's */ 331 offset = card->tx.last_bus; 332 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 333 if (card->tx.pending >= TXMAX) 334 break; 335 netdev = card->net[(j + offset + 1) % card->pdat->nbus]; 336 if (!netdev) 337 continue; 338 priv = netdev_priv(netdev); 339 if (!canif_is_active(netdev)) 340 /* it makes no sense to wake dead buses */ 341 continue; 342 if (priv->tx.pending >= TX_ECHO_SKB_MAX) 343 continue; 344 ++work_done; 345 netif_wake_queue(netdev); 346 } 347 return work_done ? IRQ_HANDLED : IRQ_NONE; 348 } 349 350 /* 351 * interrupt routines: 352 * schedule the 'real interrupt handler' 353 */ 354 static irqreturn_t softing_irq_v2(int irq, void *dev_id) 355 { 356 struct softing *card = (struct softing *)dev_id; 357 uint8_t ir; 358 359 ir = ioread8(&card->dpram[DPRAM_V2_IRQ_TOHOST]); 360 iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]); 361 return (1 == ir) ? IRQ_WAKE_THREAD : IRQ_NONE; 362 } 363 364 static irqreturn_t softing_irq_v1(int irq, void *dev_id) 365 { 366 struct softing *card = (struct softing *)dev_id; 367 uint8_t ir; 368 369 ir = ioread8(&card->dpram[DPRAM_IRQ_TOHOST]); 370 iowrite8(0, &card->dpram[DPRAM_IRQ_TOHOST]); 371 return ir ? IRQ_WAKE_THREAD : IRQ_NONE; 372 } 373 374 /* 375 * netdev/candev interoperability 376 */ 377 static int softing_netdev_open(struct net_device *ndev) 378 { 379 int ret; 380 381 /* check or determine and set bittime */ 382 ret = open_candev(ndev); 383 if (ret) 384 return ret; 385 386 ret = softing_startstop(ndev, 1); 387 if (ret < 0) 388 close_candev(ndev); 389 390 return ret; 391 } 392 393 static int softing_netdev_stop(struct net_device *ndev) 394 { 395 int ret; 396 397 netif_stop_queue(ndev); 398 399 /* softing cycle does close_candev() */ 400 ret = softing_startstop(ndev, 0); 401 return ret; 402 } 403 404 static int softing_candev_set_mode(struct net_device *ndev, enum can_mode mode) 405 { 406 int ret; 407 408 switch (mode) { 409 case CAN_MODE_START: 410 /* softing_startstop does close_candev() */ 411 ret = softing_startstop(ndev, 1); 412 return ret; 413 case CAN_MODE_STOP: 414 case CAN_MODE_SLEEP: 415 return -EOPNOTSUPP; 416 } 417 return 0; 418 } 419 420 /* 421 * Softing device management helpers 422 */ 423 int softing_enable_irq(struct softing *card, int enable) 424 { 425 int ret; 426 427 if (!card->irq.nr) { 428 return 0; 429 } else if (card->irq.requested && !enable) { 430 free_irq(card->irq.nr, card); 431 card->irq.requested = 0; 432 } else if (!card->irq.requested && enable) { 433 ret = request_threaded_irq(card->irq.nr, 434 (card->pdat->generation >= 2) ? 435 softing_irq_v2 : softing_irq_v1, 436 softing_irq_thread, IRQF_SHARED, 437 dev_name(&card->pdev->dev), card); 438 if (ret) { 439 dev_alert(&card->pdev->dev, 440 "request_threaded_irq(%u) failed\n", 441 card->irq.nr); 442 return ret; 443 } 444 card->irq.requested = 1; 445 } 446 return 0; 447 } 448 449 static void softing_card_shutdown(struct softing *card) 450 { 451 int fw_up = 0; 452 453 if (mutex_lock_interruptible(&card->fw.lock)) { 454 /* return -ERESTARTSYS */; 455 } 456 fw_up = card->fw.up; 457 card->fw.up = 0; 458 459 if (card->irq.requested && card->irq.nr) { 460 free_irq(card->irq.nr, card); 461 card->irq.requested = 0; 462 } 463 if (fw_up) { 464 if (card->pdat->enable_irq) 465 card->pdat->enable_irq(card->pdev, 0); 466 softing_set_reset_dpram(card); 467 if (card->pdat->reset) 468 card->pdat->reset(card->pdev, 1); 469 } 470 mutex_unlock(&card->fw.lock); 471 } 472 473 static int softing_card_boot(struct softing *card) 474 { 475 int ret, j; 476 static const uint8_t stream[] = { 477 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, }; 478 unsigned char back[sizeof(stream)]; 479 480 if (mutex_lock_interruptible(&card->fw.lock)) 481 return -ERESTARTSYS; 482 if (card->fw.up) { 483 mutex_unlock(&card->fw.lock); 484 return 0; 485 } 486 /* reset board */ 487 if (card->pdat->enable_irq) 488 card->pdat->enable_irq(card->pdev, 1); 489 /* boot card */ 490 softing_set_reset_dpram(card); 491 if (card->pdat->reset) 492 card->pdat->reset(card->pdev, 1); 493 for (j = 0; (j + sizeof(stream)) < card->dpram_size; 494 j += sizeof(stream)) { 495 496 memcpy_toio(&card->dpram[j], stream, sizeof(stream)); 497 /* flush IO cache */ 498 mb(); 499 memcpy_fromio(back, &card->dpram[j], sizeof(stream)); 500 501 if (!memcmp(back, stream, sizeof(stream))) 502 continue; 503 /* memory is not equal */ 504 dev_alert(&card->pdev->dev, "dpram failed at 0x%04x\n", j); 505 ret = -EIO; 506 goto failed; 507 } 508 wmb(); 509 /* load boot firmware */ 510 ret = softing_load_fw(card->pdat->boot.fw, card, card->dpram, 511 card->dpram_size, 512 card->pdat->boot.offs - card->pdat->boot.addr); 513 if (ret < 0) 514 goto failed; 515 /* load loader firmware */ 516 ret = softing_load_fw(card->pdat->load.fw, card, card->dpram, 517 card->dpram_size, 518 card->pdat->load.offs - card->pdat->load.addr); 519 if (ret < 0) 520 goto failed; 521 522 if (card->pdat->reset) 523 card->pdat->reset(card->pdev, 0); 524 softing_clr_reset_dpram(card); 525 ret = softing_bootloader_command(card, 0, "card boot"); 526 if (ret < 0) 527 goto failed; 528 ret = softing_load_app_fw(card->pdat->app.fw, card); 529 if (ret < 0) 530 goto failed; 531 532 ret = softing_chip_poweron(card); 533 if (ret < 0) 534 goto failed; 535 536 card->fw.up = 1; 537 mutex_unlock(&card->fw.lock); 538 return 0; 539 failed: 540 card->fw.up = 0; 541 if (card->pdat->enable_irq) 542 card->pdat->enable_irq(card->pdev, 0); 543 softing_set_reset_dpram(card); 544 if (card->pdat->reset) 545 card->pdat->reset(card->pdev, 1); 546 mutex_unlock(&card->fw.lock); 547 return ret; 548 } 549 550 /* 551 * netdev sysfs 552 */ 553 static ssize_t show_chip(struct device *dev, struct device_attribute *attr, 554 char *buf) 555 { 556 struct net_device *ndev = to_net_dev(dev); 557 struct softing_priv *priv = netdev2softing(ndev); 558 559 return sprintf(buf, "%i\n", priv->chip); 560 } 561 562 static ssize_t show_output(struct device *dev, struct device_attribute *attr, 563 char *buf) 564 { 565 struct net_device *ndev = to_net_dev(dev); 566 struct softing_priv *priv = netdev2softing(ndev); 567 568 return sprintf(buf, "0x%02x\n", priv->output); 569 } 570 571 static ssize_t store_output(struct device *dev, struct device_attribute *attr, 572 const char *buf, size_t count) 573 { 574 struct net_device *ndev = to_net_dev(dev); 575 struct softing_priv *priv = netdev2softing(ndev); 576 struct softing *card = priv->card; 577 unsigned long val; 578 int ret; 579 580 ret = kstrtoul(buf, 0, &val); 581 if (ret < 0) 582 return ret; 583 val &= 0xFF; 584 585 ret = mutex_lock_interruptible(&card->fw.lock); 586 if (ret) 587 return -ERESTARTSYS; 588 if (netif_running(ndev)) { 589 mutex_unlock(&card->fw.lock); 590 return -EBUSY; 591 } 592 priv->output = val; 593 mutex_unlock(&card->fw.lock); 594 return count; 595 } 596 597 static const DEVICE_ATTR(chip, 0444, show_chip, NULL); 598 static const DEVICE_ATTR(output, 0644, show_output, store_output); 599 600 static const struct attribute *const netdev_sysfs_attrs[] = { 601 &dev_attr_chip.attr, 602 &dev_attr_output.attr, 603 NULL, 604 }; 605 static const struct attribute_group netdev_sysfs_group = { 606 .name = NULL, 607 .attrs = (struct attribute **)netdev_sysfs_attrs, 608 }; 609 610 static const struct net_device_ops softing_netdev_ops = { 611 .ndo_open = softing_netdev_open, 612 .ndo_stop = softing_netdev_stop, 613 .ndo_start_xmit = softing_netdev_start_xmit, 614 .ndo_change_mtu = can_change_mtu, 615 }; 616 617 static const struct can_bittiming_const softing_btr_const = { 618 .name = "softing", 619 .tseg1_min = 1, 620 .tseg1_max = 16, 621 .tseg2_min = 1, 622 .tseg2_max = 8, 623 .sjw_max = 4, /* overruled */ 624 .brp_min = 1, 625 .brp_max = 32, /* overruled */ 626 .brp_inc = 1, 627 }; 628 629 630 static struct net_device *softing_netdev_create(struct softing *card, 631 uint16_t chip_id) 632 { 633 struct net_device *netdev; 634 struct softing_priv *priv; 635 636 netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX); 637 if (!netdev) { 638 dev_alert(&card->pdev->dev, "alloc_candev failed\n"); 639 return NULL; 640 } 641 priv = netdev_priv(netdev); 642 priv->netdev = netdev; 643 priv->card = card; 644 memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const)); 645 priv->btr_const.brp_max = card->pdat->max_brp; 646 priv->btr_const.sjw_max = card->pdat->max_sjw; 647 priv->can.bittiming_const = &priv->btr_const; 648 priv->can.clock.freq = 8000000; 649 priv->chip = chip_id; 650 priv->output = softing_default_output(netdev); 651 SET_NETDEV_DEV(netdev, &card->pdev->dev); 652 653 netdev->flags |= IFF_ECHO; 654 netdev->netdev_ops = &softing_netdev_ops; 655 priv->can.do_set_mode = softing_candev_set_mode; 656 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; 657 658 return netdev; 659 } 660 661 static int softing_netdev_register(struct net_device *netdev) 662 { 663 int ret; 664 665 ret = register_candev(netdev); 666 if (ret) { 667 dev_alert(&netdev->dev, "register failed\n"); 668 return ret; 669 } 670 if (sysfs_create_group(&netdev->dev.kobj, &netdev_sysfs_group) < 0) 671 netdev_alert(netdev, "sysfs group failed\n"); 672 673 return 0; 674 } 675 676 static void softing_netdev_cleanup(struct net_device *netdev) 677 { 678 sysfs_remove_group(&netdev->dev.kobj, &netdev_sysfs_group); 679 unregister_candev(netdev); 680 free_candev(netdev); 681 } 682 683 /* 684 * sysfs for Platform device 685 */ 686 #define DEV_ATTR_RO(name, member) \ 687 static ssize_t show_##name(struct device *dev, \ 688 struct device_attribute *attr, char *buf) \ 689 { \ 690 struct softing *card = dev_get_drvdata(dev); \ 691 return sprintf(buf, "%u\n", card->member); \ 692 } \ 693 static DEVICE_ATTR(name, 0444, show_##name, NULL) 694 695 #define DEV_ATTR_RO_STR(name, member) \ 696 static ssize_t show_##name(struct device *dev, \ 697 struct device_attribute *attr, char *buf) \ 698 { \ 699 struct softing *card = dev_get_drvdata(dev); \ 700 return sprintf(buf, "%s\n", card->member); \ 701 } \ 702 static DEVICE_ATTR(name, 0444, show_##name, NULL) 703 704 DEV_ATTR_RO(serial, id.serial); 705 DEV_ATTR_RO_STR(firmware, pdat->app.fw); 706 DEV_ATTR_RO(firmware_version, id.fw_version); 707 DEV_ATTR_RO_STR(hardware, pdat->name); 708 DEV_ATTR_RO(hardware_version, id.hw_version); 709 DEV_ATTR_RO(license, id.license); 710 711 static struct attribute *softing_pdev_attrs[] = { 712 &dev_attr_serial.attr, 713 &dev_attr_firmware.attr, 714 &dev_attr_firmware_version.attr, 715 &dev_attr_hardware.attr, 716 &dev_attr_hardware_version.attr, 717 &dev_attr_license.attr, 718 NULL, 719 }; 720 721 static const struct attribute_group softing_pdev_group = { 722 .name = NULL, 723 .attrs = softing_pdev_attrs, 724 }; 725 726 /* 727 * platform driver 728 */ 729 static int softing_pdev_remove(struct platform_device *pdev) 730 { 731 struct softing *card = platform_get_drvdata(pdev); 732 int j; 733 734 /* first, disable card*/ 735 softing_card_shutdown(card); 736 737 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 738 if (!card->net[j]) 739 continue; 740 softing_netdev_cleanup(card->net[j]); 741 card->net[j] = NULL; 742 } 743 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group); 744 745 iounmap(card->dpram); 746 kfree(card); 747 return 0; 748 } 749 750 static int softing_pdev_probe(struct platform_device *pdev) 751 { 752 const struct softing_platform_data *pdat = dev_get_platdata(&pdev->dev); 753 struct softing *card; 754 struct net_device *netdev; 755 struct softing_priv *priv; 756 struct resource *pres; 757 int ret; 758 int j; 759 760 if (!pdat) { 761 dev_warn(&pdev->dev, "no platform data\n"); 762 return -EINVAL; 763 } 764 if (pdat->nbus > ARRAY_SIZE(card->net)) { 765 dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus); 766 return -EINVAL; 767 } 768 769 card = kzalloc(sizeof(*card), GFP_KERNEL); 770 if (!card) 771 return -ENOMEM; 772 card->pdat = pdat; 773 card->pdev = pdev; 774 platform_set_drvdata(pdev, card); 775 mutex_init(&card->fw.lock); 776 spin_lock_init(&card->spin); 777 778 ret = -EINVAL; 779 pres = platform_get_resource(pdev, IORESOURCE_MEM, 0); 780 if (!pres) 781 goto platform_resource_failed; 782 card->dpram_phys = pres->start; 783 card->dpram_size = resource_size(pres); 784 card->dpram = ioremap(card->dpram_phys, card->dpram_size); 785 if (!card->dpram) { 786 dev_alert(&card->pdev->dev, "dpram ioremap failed\n"); 787 goto ioremap_failed; 788 } 789 790 pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 791 if (pres) 792 card->irq.nr = pres->start; 793 794 /* reset card */ 795 ret = softing_card_boot(card); 796 if (ret < 0) { 797 dev_alert(&pdev->dev, "failed to boot\n"); 798 goto boot_failed; 799 } 800 801 /* only now, the chip's are known */ 802 card->id.freq = card->pdat->freq; 803 804 ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group); 805 if (ret < 0) { 806 dev_alert(&card->pdev->dev, "sysfs failed\n"); 807 goto sysfs_failed; 808 } 809 810 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 811 card->net[j] = netdev = 812 softing_netdev_create(card, card->id.chip[j]); 813 if (!netdev) { 814 dev_alert(&pdev->dev, "failed to make can[%i]", j); 815 ret = -ENOMEM; 816 goto netdev_failed; 817 } 818 netdev->dev_id = j; 819 priv = netdev_priv(card->net[j]); 820 priv->index = j; 821 ret = softing_netdev_register(netdev); 822 if (ret) { 823 free_candev(netdev); 824 card->net[j] = NULL; 825 dev_alert(&card->pdev->dev, 826 "failed to register can[%i]\n", j); 827 goto netdev_failed; 828 } 829 } 830 dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name); 831 return 0; 832 833 netdev_failed: 834 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 835 if (!card->net[j]) 836 continue; 837 softing_netdev_cleanup(card->net[j]); 838 } 839 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group); 840 sysfs_failed: 841 softing_card_shutdown(card); 842 boot_failed: 843 iounmap(card->dpram); 844 ioremap_failed: 845 platform_resource_failed: 846 kfree(card); 847 return ret; 848 } 849 850 static struct platform_driver softing_driver = { 851 .driver = { 852 .name = "softing", 853 }, 854 .probe = softing_pdev_probe, 855 .remove = softing_pdev_remove, 856 }; 857 858 module_platform_driver(softing_driver); 859 860 MODULE_ALIAS("platform:softing"); 861 MODULE_DESCRIPTION("Softing DPRAM CAN driver"); 862 MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>"); 863 MODULE_LICENSE("GPL v2"); 864