drivers/net/can/softing/softing_main.c

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