drivers/net/can/softing/softing_main.c

   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  */
  31 static 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 */
  41 static 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
  51 static 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 */
  62 static 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;
 124 xmit_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  */
 142 int 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  */
 160 static 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  */
 328 static 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  */
 366 static 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
 376 static 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  */
 389 static 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
 400 static 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
 411 static 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  */
 430 int 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
 456 static 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
 479 static 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;
 545 failed:
 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  */
 559 static ssize_t show_chip(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->chip);
 566 }
 567
 568 static ssize_t show_output(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, "0x%02x\n", priv->output);
 575 }
 576
 577 static ssize_t store_output(struct device *dev, struct device_attribute *attr,
 578                 const char *buf, size_t count)
 579 {
 580         struct net_device *ndev = to_net_dev(dev);
 581         struct softing_priv *priv = netdev2softing(ndev);
 582         struct softing *card = priv->card;
 583         unsigned long val;
 584         int ret;
 585
 586         ret = kstrtoul(buf, 0, &val);
 587         if (ret < 0)
 588                 return ret;
 589         val &= 0xFF;
 590
 591         ret = mutex_lock_interruptible(&card->fw.lock);
 592         if (ret)
 593                 return -ERESTARTSYS;
 594         if (netif_running(ndev)) {
 595                 mutex_unlock(&card->fw.lock);
 596                 return -EBUSY;
 597         }
 598         priv->output = val;
 599         mutex_unlock(&card->fw.lock);
 600         return count;
 601 }
 602
 603 static const DEVICE_ATTR(chip, S_IRUGO, show_chip, NULL);
 604 static const DEVICE_ATTR(output, S_IRUGO | S_IWUSR, show_output, store_output);
 605
 606 static const struct attribute *const netdev_sysfs_attrs[] = {
 607         &dev_attr_chip.attr,
 608         &dev_attr_output.attr,
 609         NULL,
 610 };
 611 static const struct attribute_group netdev_sysfs_group = {
 612         .name = NULL,
 613         .attrs = (struct attribute **)netdev_sysfs_attrs,
 614 };
 615
 616 static const struct net_device_ops softing_netdev_ops = {
 617         .ndo_open = softing_netdev_open,
 618         .ndo_stop = softing_netdev_stop,
 619         .ndo_start_xmit = softing_netdev_start_xmit,
 620         .ndo_change_mtu = can_change_mtu,
 621 };
 622
 623 static const struct can_bittiming_const softing_btr_const = {
 624         .name = "softing",
 625         .tseg1_min = 1,
 626         .tseg1_max = 16,
 627         .tseg2_min = 1,
 628         .tseg2_max = 8,
 629         .sjw_max = 4, /* overruled */
 630         .brp_min = 1,
 631         .brp_max = 32, /* overruled */
 632         .brp_inc = 1,
 633 };
 634
 635
 636 static struct net_device *softing_netdev_create(struct softing *card,
 637                                                 uint16_t chip_id)
 638 {
 639         struct net_device *netdev;
 640         struct softing_priv *priv;
 641
 642         netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX);
 643         if (!netdev) {
 644                 dev_alert(&card->pdev->dev, "alloc_candev failed\n");
 645                 return NULL;
 646         }
 647         priv = netdev_priv(netdev);
 648         priv->netdev = netdev;
 649         priv->card = card;
 650         memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const));
 651         priv->btr_const.brp_max = card->pdat->max_brp;
 652         priv->btr_const.sjw_max = card->pdat->max_sjw;
 653         priv->can.bittiming_const = &priv->btr_const;
 654         priv->can.clock.freq = 8000000;
 655         priv->chip = chip_id;
 656         priv->output = softing_default_output(netdev);
 657         SET_NETDEV_DEV(netdev, &card->pdev->dev);
 658
 659         netdev->flags |= IFF_ECHO;
 660         netdev->netdev_ops = &softing_netdev_ops;
 661         priv->can.do_set_mode = softing_candev_set_mode;
 662         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
 663
 664         return netdev;
 665 }
 666
 667 static int softing_netdev_register(struct net_device *netdev)
 668 {
 669         int ret;
 670
 671         ret = register_candev(netdev);
 672         if (ret) {
 673                 dev_alert(&netdev->dev, "register failed\n");
 674                 return ret;
 675         }
 676         if (sysfs_create_group(&netdev->dev.kobj, &netdev_sysfs_group) < 0)
 677                 netdev_alert(netdev, "sysfs group failed\n");
 678
 679         return 0;
 680 }
 681
 682 static void softing_netdev_cleanup(struct net_device *netdev)
 683 {
 684         sysfs_remove_group(&netdev->dev.kobj, &netdev_sysfs_group);
 685         unregister_candev(netdev);
 686         free_candev(netdev);
 687 }
 688
 689 /*
 690  * sysfs for Platform device
 691  */
 692 #define DEV_ATTR_RO(name, member) \
 693 static ssize_t show_##name(struct device *dev, \
 694                 struct device_attribute *attr, char *buf) \
 695 { \
 696         struct softing *card = platform_get_drvdata(to_platform_device(dev)); \
 697         return sprintf(buf, "%u\n", card->member); \
 698 } \
 699 static DEVICE_ATTR(name, 0444, show_##name, NULL)
 700
 701 #define DEV_ATTR_RO_STR(name, member) \
 702 static ssize_t show_##name(struct device *dev, \
 703                 struct device_attribute *attr, char *buf) \
 704 { \
 705         struct softing *card = platform_get_drvdata(to_platform_device(dev)); \
 706         return sprintf(buf, "%s\n", card->member); \
 707 } \
 708 static DEVICE_ATTR(name, 0444, show_##name, NULL)
 709
 710 DEV_ATTR_RO(serial, id.serial);
 711 DEV_ATTR_RO_STR(firmware, pdat->app.fw);
 712 DEV_ATTR_RO(firmware_version, id.fw_version);
 713 DEV_ATTR_RO_STR(hardware, pdat->name);
 714 DEV_ATTR_RO(hardware_version, id.hw_version);
 715 DEV_ATTR_RO(license, id.license);
 716
 717 static struct attribute *softing_pdev_attrs[] = {
 718         &dev_attr_serial.attr,
 719         &dev_attr_firmware.attr,
 720         &dev_attr_firmware_version.attr,
 721         &dev_attr_hardware.attr,
 722         &dev_attr_hardware_version.attr,
 723         &dev_attr_license.attr,
 724         NULL,
 725 };
 726
 727 static const struct attribute_group softing_pdev_group = {
 728         .name = NULL,
 729         .attrs = softing_pdev_attrs,
 730 };
 731
 732 /*
 733  * platform driver
 734  */
 735 static int softing_pdev_remove(struct platform_device *pdev)
 736 {
 737         struct softing *card = platform_get_drvdata(pdev);
 738         int j;
 739
 740         /* first, disable card*/
 741         softing_card_shutdown(card);
 742
 743         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 744                 if (!card->net[j])
 745                         continue;
 746                 softing_netdev_cleanup(card->net[j]);
 747                 card->net[j] = NULL;
 748         }
 749         sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
 750
 751         iounmap(card->dpram);
 752         kfree(card);
 753         return 0;
 754 }
 755
 756 static int softing_pdev_probe(struct platform_device *pdev)
 757 {
 758         const struct softing_platform_data *pdat = dev_get_platdata(&pdev->dev);
 759         struct softing *card;
 760         struct net_device *netdev;
 761         struct softing_priv *priv;
 762         struct resource *pres;
 763         int ret;
 764         int j;
 765
 766         if (!pdat) {
 767                 dev_warn(&pdev->dev, "no platform data\n");
 768                 return -EINVAL;
 769         }
 770         if (pdat->nbus > ARRAY_SIZE(card->net)) {
 771                 dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus);
 772                 return -EINVAL;
 773         }
 774
 775         card = kzalloc(sizeof(*card), GFP_KERNEL);
 776         if (!card)
 777                 return -ENOMEM;
 778         card->pdat = pdat;
 779         card->pdev = pdev;
 780         platform_set_drvdata(pdev, card);
 781         mutex_init(&card->fw.lock);
 782         spin_lock_init(&card->spin);
 783
 784         ret = -EINVAL;
 785         pres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 786         if (!pres)
 787                 goto platform_resource_failed;
 788         card->dpram_phys = pres->start;
 789         card->dpram_size = resource_size(pres);
 790         card->dpram = ioremap_nocache(card->dpram_phys, card->dpram_size);
 791         if (!card->dpram) {
 792                 dev_alert(&card->pdev->dev, "dpram ioremap failed\n");
 793                 goto ioremap_failed;
 794         }
 795
 796         pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 797         if (pres)
 798                 card->irq.nr = pres->start;
 799
 800         /* reset card */
 801         ret = softing_card_boot(card);
 802         if (ret < 0) {
 803                 dev_alert(&pdev->dev, "failed to boot\n");
 804                 goto boot_failed;
 805         }
 806
 807         /* only now, the chip's are known */
 808         card->id.freq = card->pdat->freq;
 809
 810         ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group);
 811         if (ret < 0) {
 812                 dev_alert(&card->pdev->dev, "sysfs failed\n");
 813                 goto sysfs_failed;
 814         }
 815
 816         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 817                 card->net[j] = netdev =
 818                         softing_netdev_create(card, card->id.chip[j]);
 819                 if (!netdev) {
 820                         dev_alert(&pdev->dev, "failed to make can[%i]", j);
 821                         ret = -ENOMEM;
 822                         goto netdev_failed;
 823                 }
 824                 netdev->dev_id = j;
 825                 priv = netdev_priv(card->net[j]);
 826                 priv->index = j;
 827                 ret = softing_netdev_register(netdev);
 828                 if (ret) {
 829                         free_candev(netdev);
 830                         card->net[j] = NULL;
 831                         dev_alert(&card->pdev->dev,
 832                                         "failed to register can[%i]\n", j);
 833                         goto netdev_failed;
 834                 }
 835         }
 836         dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name);
 837         return 0;
 838
 839 netdev_failed:
 840         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 841                 if (!card->net[j])
 842                         continue;
 843                 softing_netdev_cleanup(card->net[j]);
 844         }
 845         sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
 846 sysfs_failed:
 847         softing_card_shutdown(card);
 848 boot_failed:
 849         iounmap(card->dpram);
 850 ioremap_failed:
 851 platform_resource_failed:
 852         kfree(card);
 853         return ret;
 854 }
 855
 856 static struct platform_driver softing_driver = {
 857         .driver = {
 858                 .name = "softing",
 859         },
 860         .probe = softing_pdev_probe,
 861         .remove = softing_pdev_remove,
 862 };
 863
 864 module_platform_driver(softing_driver);
 865
 866 MODULE_ALIAS("platform:softing");
 867 MODULE_DESCRIPTION("Softing DPRAM CAN driver");
 868 MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>");
 869 MODULE_LICENSE("GPL v2");