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/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 <[email protected]>");
 863 MODULE_LICENSE("GPL v2");