softing_main.c revision a81ab36bf52d0ca3a32251a923be1dbced726141
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 */ 31static 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 */ 41static 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 51static 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 */ 62static 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; 124xmit_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 */ 142int 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 */ 160static 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 can_bus_off(netdev); 265 netif_stop_queue(netdev); 266 } 267 /* trigger socketcan */ 268 softing_netdev_rx(netdev, &msg, ktime); 269 } 270 271 } else { 272 if (cmd & CMD_RTR) 273 msg.can_id |= CAN_RTR_FLAG; 274 msg.can_dlc = get_can_dlc(*ptr++); 275 if (cmd & CMD_XTD) { 276 msg.can_id |= CAN_EFF_FLAG; 277 msg.can_id |= le32_to_cpup((void *)ptr); 278 ptr += 4; 279 } else { 280 msg.can_id |= le16_to_cpup((void *)ptr); 281 ptr += 2; 282 } 283 /* timestamp */ 284 tmp_u32 = le32_to_cpup((void *)ptr); 285 ptr += 4; 286 ktime = softing_raw2ktime(card, tmp_u32); 287 if (!(msg.can_id & CAN_RTR_FLAG)) 288 memcpy(&msg.data[0], ptr, 8); 289 ptr += 8; 290 /* update socket */ 291 if (cmd & CMD_ACK) { 292 /* acknowledge, was tx msg */ 293 struct sk_buff *skb; 294 skb = priv->can.echo_skb[priv->tx.echo_get]; 295 if (skb) 296 skb->tstamp = ktime; 297 can_get_echo_skb(netdev, priv->tx.echo_get); 298 ++priv->tx.echo_get; 299 if (priv->tx.echo_get >= TX_ECHO_SKB_MAX) 300 priv->tx.echo_get = 0; 301 if (priv->tx.pending) 302 --priv->tx.pending; 303 if (card->tx.pending) 304 --card->tx.pending; 305 ++netdev->stats.tx_packets; 306 if (!(msg.can_id & CAN_RTR_FLAG)) 307 netdev->stats.tx_bytes += msg.can_dlc; 308 } else { 309 int ret; 310 311 ret = softing_netdev_rx(netdev, &msg, ktime); 312 if (ret == NET_RX_SUCCESS) { 313 ++netdev->stats.rx_packets; 314 if (!(msg.can_id & CAN_RTR_FLAG)) 315 netdev->stats.rx_bytes += msg.can_dlc; 316 } else { 317 ++netdev->stats.rx_dropped; 318 } 319 } 320 } 321 ++cnt; 322 return cnt; 323} 324 325/* 326 * real interrupt handler 327 */ 328static irqreturn_t softing_irq_thread(int irq, void *dev_id) 329{ 330 struct softing *card = (struct softing *)dev_id; 331 struct net_device *netdev; 332 struct softing_priv *priv; 333 int j, offset, work_done; 334 335 work_done = 0; 336 spin_lock_bh(&card->spin); 337 while (softing_handle_1(card) > 0) { 338 ++card->irq.svc_count; 339 ++work_done; 340 } 341 spin_unlock_bh(&card->spin); 342 /* resume tx queue's */ 343 offset = card->tx.last_bus; 344 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 345 if (card->tx.pending >= TXMAX) 346 break; 347 netdev = card->net[(j + offset + 1) % card->pdat->nbus]; 348 if (!netdev) 349 continue; 350 priv = netdev_priv(netdev); 351 if (!canif_is_active(netdev)) 352 /* it makes no sense to wake dead busses */ 353 continue; 354 if (priv->tx.pending >= TX_ECHO_SKB_MAX) 355 continue; 356 ++work_done; 357 netif_wake_queue(netdev); 358 } 359 return work_done ? IRQ_HANDLED : IRQ_NONE; 360} 361 362/* 363 * interrupt routines: 364 * schedule the 'real interrupt handler' 365 */ 366static irqreturn_t softing_irq_v2(int irq, void *dev_id) 367{ 368 struct softing *card = (struct softing *)dev_id; 369 uint8_t ir; 370 371 ir = ioread8(&card->dpram[DPRAM_V2_IRQ_TOHOST]); 372 iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]); 373 return (1 == ir) ? IRQ_WAKE_THREAD : IRQ_NONE; 374} 375 376static irqreturn_t softing_irq_v1(int irq, void *dev_id) 377{ 378 struct softing *card = (struct softing *)dev_id; 379 uint8_t ir; 380 381 ir = ioread8(&card->dpram[DPRAM_IRQ_TOHOST]); 382 iowrite8(0, &card->dpram[DPRAM_IRQ_TOHOST]); 383 return ir ? IRQ_WAKE_THREAD : IRQ_NONE; 384} 385 386/* 387 * netdev/candev inter-operability 388 */ 389static int softing_netdev_open(struct net_device *ndev) 390{ 391 int ret; 392 393 /* check or determine and set bittime */ 394 ret = open_candev(ndev); 395 if (!ret) 396 ret = softing_startstop(ndev, 1); 397 return ret; 398} 399 400static int softing_netdev_stop(struct net_device *ndev) 401{ 402 int ret; 403 404 netif_stop_queue(ndev); 405 406 /* softing cycle does close_candev() */ 407 ret = softing_startstop(ndev, 0); 408 return ret; 409} 410 411static int softing_candev_set_mode(struct net_device *ndev, enum can_mode mode) 412{ 413 int ret; 414 415 switch (mode) { 416 case CAN_MODE_START: 417 /* softing_startstop does close_candev() */ 418 ret = softing_startstop(ndev, 1); 419 return ret; 420 case CAN_MODE_STOP: 421 case CAN_MODE_SLEEP: 422 return -EOPNOTSUPP; 423 } 424 return 0; 425} 426 427/* 428 * Softing device management helpers 429 */ 430int softing_enable_irq(struct softing *card, int enable) 431{ 432 int ret; 433 434 if (!card->irq.nr) { 435 return 0; 436 } else if (card->irq.requested && !enable) { 437 free_irq(card->irq.nr, card); 438 card->irq.requested = 0; 439 } else if (!card->irq.requested && enable) { 440 ret = request_threaded_irq(card->irq.nr, 441 (card->pdat->generation >= 2) ? 442 softing_irq_v2 : softing_irq_v1, 443 softing_irq_thread, IRQF_SHARED, 444 dev_name(&card->pdev->dev), card); 445 if (ret) { 446 dev_alert(&card->pdev->dev, 447 "request_threaded_irq(%u) failed\n", 448 card->irq.nr); 449 return ret; 450 } 451 card->irq.requested = 1; 452 } 453 return 0; 454} 455 456static void softing_card_shutdown(struct softing *card) 457{ 458 int fw_up = 0; 459 460 if (mutex_lock_interruptible(&card->fw.lock)) 461 /* return -ERESTARTSYS */; 462 fw_up = card->fw.up; 463 card->fw.up = 0; 464 465 if (card->irq.requested && card->irq.nr) { 466 free_irq(card->irq.nr, card); 467 card->irq.requested = 0; 468 } 469 if (fw_up) { 470 if (card->pdat->enable_irq) 471 card->pdat->enable_irq(card->pdev, 0); 472 softing_set_reset_dpram(card); 473 if (card->pdat->reset) 474 card->pdat->reset(card->pdev, 1); 475 } 476 mutex_unlock(&card->fw.lock); 477} 478 479static int softing_card_boot(struct softing *card) 480{ 481 int ret, j; 482 static const uint8_t stream[] = { 483 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, }; 484 unsigned char back[sizeof(stream)]; 485 486 if (mutex_lock_interruptible(&card->fw.lock)) 487 return -ERESTARTSYS; 488 if (card->fw.up) { 489 mutex_unlock(&card->fw.lock); 490 return 0; 491 } 492 /* reset board */ 493 if (card->pdat->enable_irq) 494 card->pdat->enable_irq(card->pdev, 1); 495 /* boot card */ 496 softing_set_reset_dpram(card); 497 if (card->pdat->reset) 498 card->pdat->reset(card->pdev, 1); 499 for (j = 0; (j + sizeof(stream)) < card->dpram_size; 500 j += sizeof(stream)) { 501 502 memcpy_toio(&card->dpram[j], stream, sizeof(stream)); 503 /* flush IO cache */ 504 mb(); 505 memcpy_fromio(back, &card->dpram[j], sizeof(stream)); 506 507 if (!memcmp(back, stream, sizeof(stream))) 508 continue; 509 /* memory is not equal */ 510 dev_alert(&card->pdev->dev, "dpram failed at 0x%04x\n", j); 511 ret = -EIO; 512 goto failed; 513 } 514 wmb(); 515 /* load boot firmware */ 516 ret = softing_load_fw(card->pdat->boot.fw, card, card->dpram, 517 card->dpram_size, 518 card->pdat->boot.offs - card->pdat->boot.addr); 519 if (ret < 0) 520 goto failed; 521 /* load loader firmware */ 522 ret = softing_load_fw(card->pdat->load.fw, card, card->dpram, 523 card->dpram_size, 524 card->pdat->load.offs - card->pdat->load.addr); 525 if (ret < 0) 526 goto failed; 527 528 if (card->pdat->reset) 529 card->pdat->reset(card->pdev, 0); 530 softing_clr_reset_dpram(card); 531 ret = softing_bootloader_command(card, 0, "card boot"); 532 if (ret < 0) 533 goto failed; 534 ret = softing_load_app_fw(card->pdat->app.fw, card); 535 if (ret < 0) 536 goto failed; 537 538 ret = softing_chip_poweron(card); 539 if (ret < 0) 540 goto failed; 541 542 card->fw.up = 1; 543 mutex_unlock(&card->fw.lock); 544 return 0; 545failed: 546 card->fw.up = 0; 547 if (card->pdat->enable_irq) 548 card->pdat->enable_irq(card->pdev, 0); 549 softing_set_reset_dpram(card); 550 if (card->pdat->reset) 551 card->pdat->reset(card->pdev, 1); 552 mutex_unlock(&card->fw.lock); 553 return ret; 554} 555 556/* 557 * netdev sysfs 558 */ 559static ssize_t show_channel(struct device *dev, struct device_attribute *attr, 560 char *buf) 561{ 562 struct net_device *ndev = to_net_dev(dev); 563 struct softing_priv *priv = netdev2softing(ndev); 564 565 return sprintf(buf, "%i\n", priv->index); 566} 567 568static ssize_t show_chip(struct device *dev, struct device_attribute *attr, 569 char *buf) 570{ 571 struct net_device *ndev = to_net_dev(dev); 572 struct softing_priv *priv = netdev2softing(ndev); 573 574 return sprintf(buf, "%i\n", priv->chip); 575} 576 577static ssize_t show_output(struct device *dev, struct device_attribute *attr, 578 char *buf) 579{ 580 struct net_device *ndev = to_net_dev(dev); 581 struct softing_priv *priv = netdev2softing(ndev); 582 583 return sprintf(buf, "0x%02x\n", priv->output); 584} 585 586static ssize_t store_output(struct device *dev, struct device_attribute *attr, 587 const char *buf, size_t count) 588{ 589 struct net_device *ndev = to_net_dev(dev); 590 struct softing_priv *priv = netdev2softing(ndev); 591 struct softing *card = priv->card; 592 unsigned long val; 593 int ret; 594 595 ret = kstrtoul(buf, 0, &val); 596 if (ret < 0) 597 return ret; 598 val &= 0xFF; 599 600 ret = mutex_lock_interruptible(&card->fw.lock); 601 if (ret) 602 return -ERESTARTSYS; 603 if (netif_running(ndev)) { 604 mutex_unlock(&card->fw.lock); 605 return -EBUSY; 606 } 607 priv->output = val; 608 mutex_unlock(&card->fw.lock); 609 return count; 610} 611 612static const DEVICE_ATTR(channel, S_IRUGO, show_channel, NULL); 613static const DEVICE_ATTR(chip, S_IRUGO, show_chip, NULL); 614static const DEVICE_ATTR(output, S_IRUGO | S_IWUSR, show_output, store_output); 615 616static const struct attribute *const netdev_sysfs_attrs[] = { 617 &dev_attr_channel.attr, 618 &dev_attr_chip.attr, 619 &dev_attr_output.attr, 620 NULL, 621}; 622static const struct attribute_group netdev_sysfs_group = { 623 .name = NULL, 624 .attrs = (struct attribute **)netdev_sysfs_attrs, 625}; 626 627static const struct net_device_ops softing_netdev_ops = { 628 .ndo_open = softing_netdev_open, 629 .ndo_stop = softing_netdev_stop, 630 .ndo_start_xmit = softing_netdev_start_xmit, 631}; 632 633static const struct can_bittiming_const softing_btr_const = { 634 .name = "softing", 635 .tseg1_min = 1, 636 .tseg1_max = 16, 637 .tseg2_min = 1, 638 .tseg2_max = 8, 639 .sjw_max = 4, /* overruled */ 640 .brp_min = 1, 641 .brp_max = 32, /* overruled */ 642 .brp_inc = 1, 643}; 644 645 646static struct net_device *softing_netdev_create(struct softing *card, 647 uint16_t chip_id) 648{ 649 struct net_device *netdev; 650 struct softing_priv *priv; 651 652 netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX); 653 if (!netdev) { 654 dev_alert(&card->pdev->dev, "alloc_candev failed\n"); 655 return NULL; 656 } 657 priv = netdev_priv(netdev); 658 priv->netdev = netdev; 659 priv->card = card; 660 memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const)); 661 priv->btr_const.brp_max = card->pdat->max_brp; 662 priv->btr_const.sjw_max = card->pdat->max_sjw; 663 priv->can.bittiming_const = &priv->btr_const; 664 priv->can.clock.freq = 8000000; 665 priv->chip = chip_id; 666 priv->output = softing_default_output(netdev); 667 SET_NETDEV_DEV(netdev, &card->pdev->dev); 668 669 netdev->flags |= IFF_ECHO; 670 netdev->netdev_ops = &softing_netdev_ops; 671 priv->can.do_set_mode = softing_candev_set_mode; 672 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; 673 674 return netdev; 675} 676 677static int softing_netdev_register(struct net_device *netdev) 678{ 679 int ret; 680 681 netdev->sysfs_groups[0] = &netdev_sysfs_group; 682 ret = register_candev(netdev); 683 if (ret) { 684 dev_alert(&netdev->dev, "register failed\n"); 685 return ret; 686 } 687 return 0; 688} 689 690static void softing_netdev_cleanup(struct net_device *netdev) 691{ 692 unregister_candev(netdev); 693 free_candev(netdev); 694} 695 696/* 697 * sysfs for Platform device 698 */ 699#define DEV_ATTR_RO(name, member) \ 700static ssize_t show_##name(struct device *dev, \ 701 struct device_attribute *attr, char *buf) \ 702{ \ 703 struct softing *card = platform_get_drvdata(to_platform_device(dev)); \ 704 return sprintf(buf, "%u\n", card->member); \ 705} \ 706static DEVICE_ATTR(name, 0444, show_##name, NULL) 707 708#define DEV_ATTR_RO_STR(name, member) \ 709static ssize_t show_##name(struct device *dev, \ 710 struct device_attribute *attr, char *buf) \ 711{ \ 712 struct softing *card = platform_get_drvdata(to_platform_device(dev)); \ 713 return sprintf(buf, "%s\n", card->member); \ 714} \ 715static DEVICE_ATTR(name, 0444, show_##name, NULL) 716 717DEV_ATTR_RO(serial, id.serial); 718DEV_ATTR_RO_STR(firmware, pdat->app.fw); 719DEV_ATTR_RO(firmware_version, id.fw_version); 720DEV_ATTR_RO_STR(hardware, pdat->name); 721DEV_ATTR_RO(hardware_version, id.hw_version); 722DEV_ATTR_RO(license, id.license); 723DEV_ATTR_RO(frequency, id.freq); 724DEV_ATTR_RO(txpending, tx.pending); 725 726static struct attribute *softing_pdev_attrs[] = { 727 &dev_attr_serial.attr, 728 &dev_attr_firmware.attr, 729 &dev_attr_firmware_version.attr, 730 &dev_attr_hardware.attr, 731 &dev_attr_hardware_version.attr, 732 &dev_attr_license.attr, 733 &dev_attr_frequency.attr, 734 &dev_attr_txpending.attr, 735 NULL, 736}; 737 738static const struct attribute_group softing_pdev_group = { 739 .name = NULL, 740 .attrs = softing_pdev_attrs, 741}; 742 743/* 744 * platform driver 745 */ 746static int softing_pdev_remove(struct platform_device *pdev) 747{ 748 struct softing *card = platform_get_drvdata(pdev); 749 int j; 750 751 /* first, disable card*/ 752 softing_card_shutdown(card); 753 754 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 755 if (!card->net[j]) 756 continue; 757 softing_netdev_cleanup(card->net[j]); 758 card->net[j] = NULL; 759 } 760 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group); 761 762 iounmap(card->dpram); 763 kfree(card); 764 return 0; 765} 766 767static int softing_pdev_probe(struct platform_device *pdev) 768{ 769 const struct softing_platform_data *pdat = dev_get_platdata(&pdev->dev); 770 struct softing *card; 771 struct net_device *netdev; 772 struct softing_priv *priv; 773 struct resource *pres; 774 int ret; 775 int j; 776 777 if (!pdat) { 778 dev_warn(&pdev->dev, "no platform data\n"); 779 return -EINVAL; 780 } 781 if (pdat->nbus > ARRAY_SIZE(card->net)) { 782 dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus); 783 return -EINVAL; 784 } 785 786 card = kzalloc(sizeof(*card), GFP_KERNEL); 787 if (!card) 788 return -ENOMEM; 789 card->pdat = pdat; 790 card->pdev = pdev; 791 platform_set_drvdata(pdev, card); 792 mutex_init(&card->fw.lock); 793 spin_lock_init(&card->spin); 794 795 ret = -EINVAL; 796 pres = platform_get_resource(pdev, IORESOURCE_MEM, 0); 797 if (!pres) 798 goto platform_resource_failed; 799 card->dpram_phys = pres->start; 800 card->dpram_size = resource_size(pres); 801 card->dpram = ioremap_nocache(card->dpram_phys, card->dpram_size); 802 if (!card->dpram) { 803 dev_alert(&card->pdev->dev, "dpram ioremap failed\n"); 804 goto ioremap_failed; 805 } 806 807 pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 808 if (pres) 809 card->irq.nr = pres->start; 810 811 /* reset card */ 812 ret = softing_card_boot(card); 813 if (ret < 0) { 814 dev_alert(&pdev->dev, "failed to boot\n"); 815 goto boot_failed; 816 } 817 818 /* only now, the chip's are known */ 819 card->id.freq = card->pdat->freq; 820 821 ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group); 822 if (ret < 0) { 823 dev_alert(&card->pdev->dev, "sysfs failed\n"); 824 goto sysfs_failed; 825 } 826 827 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 828 card->net[j] = netdev = 829 softing_netdev_create(card, card->id.chip[j]); 830 if (!netdev) { 831 dev_alert(&pdev->dev, "failed to make can[%i]", j); 832 ret = -ENOMEM; 833 goto netdev_failed; 834 } 835 priv = netdev_priv(card->net[j]); 836 priv->index = j; 837 ret = softing_netdev_register(netdev); 838 if (ret) { 839 free_candev(netdev); 840 card->net[j] = NULL; 841 dev_alert(&card->pdev->dev, 842 "failed to register can[%i]\n", j); 843 goto netdev_failed; 844 } 845 } 846 dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name); 847 return 0; 848 849netdev_failed: 850 for (j = 0; j < ARRAY_SIZE(card->net); ++j) { 851 if (!card->net[j]) 852 continue; 853 softing_netdev_cleanup(card->net[j]); 854 } 855 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group); 856sysfs_failed: 857 softing_card_shutdown(card); 858boot_failed: 859 iounmap(card->dpram); 860ioremap_failed: 861platform_resource_failed: 862 kfree(card); 863 return ret; 864} 865 866static struct platform_driver softing_driver = { 867 .driver = { 868 .name = "softing", 869 .owner = THIS_MODULE, 870 }, 871 .probe = softing_pdev_probe, 872 .remove = softing_pdev_remove, 873}; 874 875module_platform_driver(softing_driver); 876 877MODULE_ALIAS("platform:softing"); 878MODULE_DESCRIPTION("Softing DPRAM CAN driver"); 879MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>"); 880MODULE_LICENSE("GPL v2"); 881