Pileus Git - ~andy/linux/blob - 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/init.h>
  21 #include <linux/interrupt.h>
  22 #include <asm/io.h>
  23
  24 #include "softing.h"
  25
  26 #define TX_ECHO_SKB_MAX (((TXMAX+1)/2)-1)
  27
  28 /*
  29  * test is a specific CAN netdev
  30  * is online (ie. up 'n running, not sleeping, not busoff
  31  */
  32 static inline int canif_is_active(struct net_device *netdev)
  33 {
  34         struct can_priv *can = netdev_priv(netdev);
  35
  36         if (!netif_running(netdev))
  37                 return 0;
  38         return (can->state <= CAN_STATE_ERROR_PASSIVE);
  39 }
  40
  41 /* reset DPRAM */
  42 static inline void softing_set_reset_dpram(struct softing *card)
  43 {
  44         if (card->pdat->generation >= 2) {
  45                 spin_lock_bh(&card->spin);
  46                 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) & ~1,
  47                                 &card->dpram[DPRAM_V2_RESET]);
  48                 spin_unlock_bh(&card->spin);
  49         }
  50 }
  51
  52 static inline void softing_clr_reset_dpram(struct softing *card)
  53 {
  54         if (card->pdat->generation >= 2) {
  55                 spin_lock_bh(&card->spin);
  56                 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) | 1,
  57                                 &card->dpram[DPRAM_V2_RESET]);
  58                 spin_unlock_bh(&card->spin);
  59         }
  60 }
  61
  62 /* trigger the tx queue-ing */
  63 static netdev_tx_t softing_netdev_start_xmit(struct sk_buff *skb,
  64                 struct net_device *dev)
  65 {
  66         struct softing_priv *priv = netdev_priv(dev);
  67         struct softing *card = priv->card;
  68         int ret;
  69         uint8_t *ptr;
  70         uint8_t fifo_wr, fifo_rd;
  71         struct can_frame *cf = (struct can_frame *)skb->data;
  72         uint8_t buf[DPRAM_TX_SIZE];
  73
  74         if (can_dropped_invalid_skb(dev, skb))
  75                 return NETDEV_TX_OK;
  76
  77         spin_lock(&card->spin);
  78
  79         ret = NETDEV_TX_BUSY;
  80         if (!card->fw.up ||
  81                         (card->tx.pending >= TXMAX) ||
  82                         (priv->tx.pending >= TX_ECHO_SKB_MAX))
  83                 goto xmit_done;
  84         fifo_wr = ioread8(&card->dpram[DPRAM_TX_WR]);
  85         fifo_rd = ioread8(&card->dpram[DPRAM_TX_RD]);
  86         if (fifo_wr == fifo_rd)
  87                 /* fifo full */
  88                 goto xmit_done;
  89         memset(buf, 0, sizeof(buf));
  90         ptr = buf;
  91         *ptr = CMD_TX;
  92         if (cf->can_id & CAN_RTR_FLAG)
  93                 *ptr |= CMD_RTR;
  94         if (cf->can_id & CAN_EFF_FLAG)
  95                 *ptr |= CMD_XTD;
  96         if (priv->index)
  97                 *ptr |= CMD_BUS2;
  98         ++ptr;
  99         *ptr++ = cf->can_dlc;
 100         *ptr++ = (cf->can_id >> 0);
 101         *ptr++ = (cf->can_id >> 8);
 102         if (cf->can_id & CAN_EFF_FLAG) {
 103                 *ptr++ = (cf->can_id >> 16);
 104                 *ptr++ = (cf->can_id >> 24);
 105         } else {
 106                 /* increment 1, not 2 as you might think */
 107                 ptr += 1;
 108         }
 109         if (!(cf->can_id & CAN_RTR_FLAG))
 110                 memcpy(ptr, &cf->data[0], cf->can_dlc);
 111         memcpy_toio(&card->dpram[DPRAM_TX + DPRAM_TX_SIZE * fifo_wr],
 112                         buf, DPRAM_TX_SIZE);
 113         if (++fifo_wr >= DPRAM_TX_CNT)
 114                 fifo_wr = 0;
 115         iowrite8(fifo_wr, &card->dpram[DPRAM_TX_WR]);
 116         card->tx.last_bus = priv->index;
 117         ++card->tx.pending;
 118         ++priv->tx.pending;
 119         can_put_echo_skb(skb, dev, priv->tx.echo_put);
 120         ++priv->tx.echo_put;
 121         if (priv->tx.echo_put >= TX_ECHO_SKB_MAX)
 122                 priv->tx.echo_put = 0;
 123         /* can_put_echo_skb() saves the skb, safe to return TX_OK */
 124         ret = NETDEV_TX_OK;
 125 xmit_done:
 126         spin_unlock(&card->spin);
 127         if (card->tx.pending >= TXMAX) {
 128                 int j;
 129                 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 130                         if (card->net[j])
 131                                 netif_stop_queue(card->net[j]);
 132                 }
 133         }
 134         if (ret != NETDEV_TX_OK)
 135                 netif_stop_queue(dev);
 136
 137         return ret;
 138 }
 139
 140 /*
 141  * shortcut for skb delivery
 142  */
 143 int softing_netdev_rx(struct net_device *netdev, const struct can_frame *msg,
 144                 ktime_t ktime)
 145 {
 146         struct sk_buff *skb;
 147         struct can_frame *cf;
 148
 149         skb = alloc_can_skb(netdev, &cf);
 150         if (!skb)
 151                 return -ENOMEM;
 152         memcpy(cf, msg, sizeof(*msg));
 153         skb->tstamp = ktime;
 154         return netif_rx(skb);
 155 }
 156
 157 /*
 158  * softing_handle_1
 159  * pop 1 entry from the DPRAM queue, and process
 160  */
 161 static int softing_handle_1(struct softing *card)
 162 {
 163         struct net_device *netdev;
 164         struct softing_priv *priv;
 165         ktime_t ktime;
 166         struct can_frame msg;
 167         int cnt = 0, lost_msg;
 168         uint8_t fifo_rd, fifo_wr, cmd;
 169         uint8_t *ptr;
 170         uint32_t tmp_u32;
 171         uint8_t buf[DPRAM_RX_SIZE];
 172
 173         memset(&msg, 0, sizeof(msg));
 174         /* test for lost msgs */
 175         lost_msg = ioread8(&card->dpram[DPRAM_RX_LOST]);
 176         if (lost_msg) {
 177                 int j;
 178                 /* reset condition */
 179                 iowrite8(0, &card->dpram[DPRAM_RX_LOST]);
 180                 /* prepare msg */
 181                 msg.can_id = CAN_ERR_FLAG | CAN_ERR_CRTL;
 182                 msg.can_dlc = CAN_ERR_DLC;
 183                 msg.data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 184                 /*
 185                  * service to all busses, we don't know which it was applicable
 186                  * but only service busses that are online
 187                  */
 188                 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 189                         netdev = card->net[j];
 190                         if (!netdev)
 191                                 continue;
 192                         if (!canif_is_active(netdev))
 193                                 /* a dead bus has no overflows */
 194                                 continue;
 195                         ++netdev->stats.rx_over_errors;
 196                         softing_netdev_rx(netdev, &msg, ktime_set(0, 0));
 197                 }
 198                 /* prepare for other use */
 199                 memset(&msg, 0, sizeof(msg));
 200                 ++cnt;
 201         }
 202
 203         fifo_rd = ioread8(&card->dpram[DPRAM_RX_RD]);
 204         fifo_wr = ioread8(&card->dpram[DPRAM_RX_WR]);
 205
 206         if (++fifo_rd >= DPRAM_RX_CNT)
 207                 fifo_rd = 0;
 208         if (fifo_wr == fifo_rd)
 209                 return cnt;
 210
 211         memcpy_fromio(buf, &card->dpram[DPRAM_RX + DPRAM_RX_SIZE*fifo_rd],
 212                         DPRAM_RX_SIZE);
 213         mb();
 214         /* trigger dual port RAM */
 215         iowrite8(fifo_rd, &card->dpram[DPRAM_RX_RD]);
 216
 217         ptr = buf;
 218         cmd = *ptr++;
 219         if (cmd == 0xff)
 220                 /* not quite useful, probably the card has got out */
 221                 return 0;
 222         netdev = card->net[0];
 223         if (cmd & CMD_BUS2)
 224                 netdev = card->net[1];
 225         priv = netdev_priv(netdev);
 226
 227         if (cmd & CMD_ERR) {
 228                 uint8_t can_state, state;
 229
 230                 state = *ptr++;
 231
 232                 msg.can_id = CAN_ERR_FLAG;
 233                 msg.can_dlc = CAN_ERR_DLC;
 234
 235                 if (state & SF_MASK_BUSOFF) {
 236                         can_state = CAN_STATE_BUS_OFF;
 237                         msg.can_id |= CAN_ERR_BUSOFF;
 238                         state = STATE_BUSOFF;
 239                 } else if (state & SF_MASK_EPASSIVE) {
 240                         can_state = CAN_STATE_ERROR_PASSIVE;
 241                         msg.can_id |= CAN_ERR_CRTL;
 242                         msg.data[1] = CAN_ERR_CRTL_TX_PASSIVE;
 243                         state = STATE_EPASSIVE;
 244                 } else {
 245                         can_state = CAN_STATE_ERROR_ACTIVE;
 246                         msg.can_id |= CAN_ERR_CRTL;
 247                         state = STATE_EACTIVE;
 248                 }
 249                 /* update DPRAM */
 250                 iowrite8(state, &card->dpram[priv->index ?
 251                                 DPRAM_INFO_BUSSTATE2 : DPRAM_INFO_BUSSTATE]);
 252                 /* timestamp */
 253                 tmp_u32 = le32_to_cpup((void *)ptr);
 254                 ptr += 4;
 255                 ktime = softing_raw2ktime(card, tmp_u32);
 256
 257                 ++netdev->stats.rx_errors;
 258                 /* update internal status */
 259                 if (can_state != priv->can.state) {
 260                         priv->can.state = can_state;
 261                         if (can_state == CAN_STATE_ERROR_PASSIVE)
 262                                 ++priv->can.can_stats.error_passive;
 263                         else if (can_state == CAN_STATE_BUS_OFF) {
 264                                 /* this calls can_close_cleanup() */
 265                                 can_bus_off(netdev);
 266                                 netif_stop_queue(netdev);
 267                         }
 268                         /* trigger socketcan */
 269                         softing_netdev_rx(netdev, &msg, ktime);
 270                 }
 271
 272         } else {
 273                 if (cmd & CMD_RTR)
 274                         msg.can_id |= CAN_RTR_FLAG;
 275                 msg.can_dlc = get_can_dlc(*ptr++);
 276                 if (cmd & CMD_XTD) {
 277                         msg.can_id |= CAN_EFF_FLAG;
 278                         msg.can_id |= le32_to_cpup((void *)ptr);
 279                         ptr += 4;
 280                 } else {
 281                         msg.can_id |= le16_to_cpup((void *)ptr);
 282                         ptr += 2;
 283                 }
 284                 /* timestamp */
 285                 tmp_u32 = le32_to_cpup((void *)ptr);
 286                 ptr += 4;
 287                 ktime = softing_raw2ktime(card, tmp_u32);
 288                 if (!(msg.can_id & CAN_RTR_FLAG))
 289                         memcpy(&msg.data[0], ptr, 8);
 290                 ptr += 8;
 291                 /* update socket */
 292                 if (cmd & CMD_ACK) {
 293                         /* acknowledge, was tx msg */
 294                         struct sk_buff *skb;
 295                         skb = priv->can.echo_skb[priv->tx.echo_get];
 296                         if (skb)
 297                                 skb->tstamp = ktime;
 298                         can_get_echo_skb(netdev, priv->tx.echo_get);
 299                         ++priv->tx.echo_get;
 300                         if (priv->tx.echo_get >= TX_ECHO_SKB_MAX)
 301                                 priv->tx.echo_get = 0;
 302                         if (priv->tx.pending)
 303                                 --priv->tx.pending;
 304                         if (card->tx.pending)
 305                                 --card->tx.pending;
 306                         ++netdev->stats.tx_packets;
 307                         if (!(msg.can_id & CAN_RTR_FLAG))
 308                                 netdev->stats.tx_bytes += msg.can_dlc;
 309                 } else {
 310                         int ret;
 311
 312                         ret = softing_netdev_rx(netdev, &msg, ktime);
 313                         if (ret == NET_RX_SUCCESS) {
 314                                 ++netdev->stats.rx_packets;
 315                                 if (!(msg.can_id & CAN_RTR_FLAG))
 316                                         netdev->stats.rx_bytes += msg.can_dlc;
 317                         } else {
 318                                 ++netdev->stats.rx_dropped;
 319                         }
 320                 }
 321         }
 322         ++cnt;
 323         return cnt;
 324 }
 325
 326 /*
 327  * real interrupt handler
 328  */
 329 static irqreturn_t softing_irq_thread(int irq, void *dev_id)
 330 {
 331         struct softing *card = (struct softing *)dev_id;
 332         struct net_device *netdev;
 333         struct softing_priv *priv;
 334         int j, offset, work_done;
 335
 336         work_done = 0;
 337         spin_lock_bh(&card->spin);
 338         while (softing_handle_1(card) > 0) {
 339                 ++card->irq.svc_count;
 340                 ++work_done;
 341         }
 342         spin_unlock_bh(&card->spin);
 343         /* resume tx queue's */
 344         offset = card->tx.last_bus;
 345         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 346                 if (card->tx.pending >= TXMAX)
 347                         break;
 348                 netdev = card->net[(j + offset + 1) % card->pdat->nbus];
 349                 if (!netdev)
 350                         continue;
 351                 priv = netdev_priv(netdev);
 352                 if (!canif_is_active(netdev))
 353                         /* it makes no sense to wake dead busses */
 354                         continue;
 355                 if (priv->tx.pending >= TX_ECHO_SKB_MAX)
 356                         continue;
 357                 ++work_done;
 358                 netif_wake_queue(netdev);
 359         }
 360         return work_done ? IRQ_HANDLED : IRQ_NONE;
 361 }
 362
 363 /*
 364  * interrupt routines:
 365  * schedule the 'real interrupt handler'
 366  */
 367 static irqreturn_t softing_irq_v2(int irq, void *dev_id)
 368 {
 369         struct softing *card = (struct softing *)dev_id;
 370         uint8_t ir;
 371
 372         ir = ioread8(&card->dpram[DPRAM_V2_IRQ_TOHOST]);
 373         iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]);
 374         return (1 == ir) ? IRQ_WAKE_THREAD : IRQ_NONE;
 375 }
 376
 377 static irqreturn_t softing_irq_v1(int irq, void *dev_id)
 378 {
 379         struct softing *card = (struct softing *)dev_id;
 380         uint8_t ir;
 381
 382         ir = ioread8(&card->dpram[DPRAM_IRQ_TOHOST]);
 383         iowrite8(0, &card->dpram[DPRAM_IRQ_TOHOST]);
 384         return ir ? IRQ_WAKE_THREAD : IRQ_NONE;
 385 }
 386
 387 /*
 388  * netdev/candev inter-operability
 389  */
 390 static int softing_netdev_open(struct net_device *ndev)
 391 {
 392         int ret;
 393
 394         /* check or determine and set bittime */
 395         ret = open_candev(ndev);
 396         if (!ret)
 397                 ret = softing_startstop(ndev, 1);
 398         return ret;
 399 }
 400
 401 static int softing_netdev_stop(struct net_device *ndev)
 402 {
 403         int ret;
 404
 405         netif_stop_queue(ndev);
 406
 407         /* softing cycle does close_candev() */
 408         ret = softing_startstop(ndev, 0);
 409         return ret;
 410 }
 411
 412 static int softing_candev_set_mode(struct net_device *ndev, enum can_mode mode)
 413 {
 414         int ret;
 415
 416         switch (mode) {
 417         case CAN_MODE_START:
 418                 /* softing_startstop does close_candev() */
 419                 ret = softing_startstop(ndev, 1);
 420                 return ret;
 421         case CAN_MODE_STOP:
 422         case CAN_MODE_SLEEP:
 423                 return -EOPNOTSUPP;
 424         }
 425         return 0;
 426 }
 427
 428 /*
 429  * Softing device management helpers
 430  */
 431 int softing_enable_irq(struct softing *card, int enable)
 432 {
 433         int ret;
 434
 435         if (!card->irq.nr) {
 436                 return 0;
 437         } else if (card->irq.requested && !enable) {
 438                 free_irq(card->irq.nr, card);
 439                 card->irq.requested = 0;
 440         } else if (!card->irq.requested && enable) {
 441                 ret = request_threaded_irq(card->irq.nr,
 442                                 (card->pdat->generation >= 2) ?
 443                                         softing_irq_v2 : softing_irq_v1,
 444                                 softing_irq_thread, IRQF_SHARED,
 445                                 dev_name(&card->pdev->dev), card);
 446                 if (ret) {
 447                         dev_alert(&card->pdev->dev,
 448                                         "request_threaded_irq(%u) failed\n",
 449                                         card->irq.nr);
 450                         return ret;
 451                 }
 452                 card->irq.requested = 1;
 453         }
 454         return 0;
 455 }
 456
 457 static void softing_card_shutdown(struct softing *card)
 458 {
 459         int fw_up = 0;
 460
 461         if (mutex_lock_interruptible(&card->fw.lock))
 462                 /* return -ERESTARTSYS */;
 463         fw_up = card->fw.up;
 464         card->fw.up = 0;
 465
 466         if (card->irq.requested && card->irq.nr) {
 467                 free_irq(card->irq.nr, card);
 468                 card->irq.requested = 0;
 469         }
 470         if (fw_up) {
 471                 if (card->pdat->enable_irq)
 472                         card->pdat->enable_irq(card->pdev, 0);
 473                 softing_set_reset_dpram(card);
 474                 if (card->pdat->reset)
 475                         card->pdat->reset(card->pdev, 1);
 476         }
 477         mutex_unlock(&card->fw.lock);
 478 }
 479
 480 static int softing_card_boot(struct softing *card)
 481 {
 482         int ret, j;
 483         static const uint8_t stream[] = {
 484                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, };
 485         unsigned char back[sizeof(stream)];
 486
 487         if (mutex_lock_interruptible(&card->fw.lock))
 488                 return -ERESTARTSYS;
 489         if (card->fw.up) {
 490                 mutex_unlock(&card->fw.lock);
 491                 return 0;
 492         }
 493         /* reset board */
 494         if (card->pdat->enable_irq)
 495                 card->pdat->enable_irq(card->pdev, 1);
 496         /* boot card */
 497         softing_set_reset_dpram(card);
 498         if (card->pdat->reset)
 499                 card->pdat->reset(card->pdev, 1);
 500         for (j = 0; (j + sizeof(stream)) < card->dpram_size;
 501                         j += sizeof(stream)) {
 502
 503                 memcpy_toio(&card->dpram[j], stream, sizeof(stream));
 504                 /* flush IO cache */
 505                 mb();
 506                 memcpy_fromio(back, &card->dpram[j], sizeof(stream));
 507
 508                 if (!memcmp(back, stream, sizeof(stream)))
 509                         continue;
 510                 /* memory is not equal */
 511                 dev_alert(&card->pdev->dev, "dpram failed at 0x%04x\n", j);
 512                 ret = -EIO;
 513                 goto failed;
 514         }
 515         wmb();
 516         /* load boot firmware */
 517         ret = softing_load_fw(card->pdat->boot.fw, card, card->dpram,
 518                                 card->dpram_size,
 519                                 card->pdat->boot.offs - card->pdat->boot.addr);
 520         if (ret < 0)
 521                 goto failed;
 522         /* load loader firmware */
 523         ret = softing_load_fw(card->pdat->load.fw, card, card->dpram,
 524                                 card->dpram_size,
 525                                 card->pdat->load.offs - card->pdat->load.addr);
 526         if (ret < 0)
 527                 goto failed;
 528
 529         if (card->pdat->reset)
 530                 card->pdat->reset(card->pdev, 0);
 531         softing_clr_reset_dpram(card);
 532         ret = softing_bootloader_command(card, 0, "card boot");
 533         if (ret < 0)
 534                 goto failed;
 535         ret = softing_load_app_fw(card->pdat->app.fw, card);
 536         if (ret < 0)
 537                 goto failed;
 538
 539         ret = softing_chip_poweron(card);
 540         if (ret < 0)
 541                 goto failed;
 542
 543         card->fw.up = 1;
 544         mutex_unlock(&card->fw.lock);
 545         return 0;
 546 failed:
 547         card->fw.up = 0;
 548         if (card->pdat->enable_irq)
 549                 card->pdat->enable_irq(card->pdev, 0);
 550         softing_set_reset_dpram(card);
 551         if (card->pdat->reset)
 552                 card->pdat->reset(card->pdev, 1);
 553         mutex_unlock(&card->fw.lock);
 554         return ret;
 555 }
 556
 557 /*
 558  * netdev sysfs
 559  */
 560 static ssize_t show_channel(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, "%i\n", priv->index);
 567 }
 568
 569 static ssize_t show_chip(struct device *dev, struct device_attribute *attr,
 570                 char *buf)
 571 {
 572         struct net_device *ndev = to_net_dev(dev);
 573         struct softing_priv *priv = netdev2softing(ndev);
 574
 575         return sprintf(buf, "%i\n", priv->chip);
 576 }
 577
 578 static ssize_t show_output(struct device *dev, struct device_attribute *attr,
 579                 char *buf)
 580 {
 581         struct net_device *ndev = to_net_dev(dev);
 582         struct softing_priv *priv = netdev2softing(ndev);
 583
 584         return sprintf(buf, "0x%02x\n", priv->output);
 585 }
 586
 587 static ssize_t store_output(struct device *dev, struct device_attribute *attr,
 588                 const char *buf, size_t count)
 589 {
 590         struct net_device *ndev = to_net_dev(dev);
 591         struct softing_priv *priv = netdev2softing(ndev);
 592         struct softing *card = priv->card;
 593         unsigned long val;
 594         int ret;
 595
 596         ret = kstrtoul(buf, 0, &val);
 597         if (ret < 0)
 598                 return ret;
 599         val &= 0xFF;
 600
 601         ret = mutex_lock_interruptible(&card->fw.lock);
 602         if (ret)
 603                 return -ERESTARTSYS;
 604         if (netif_running(ndev)) {
 605                 mutex_unlock(&card->fw.lock);
 606                 return -EBUSY;
 607         }
 608         priv->output = val;
 609         mutex_unlock(&card->fw.lock);
 610         return count;
 611 }
 612
 613 static const DEVICE_ATTR(channel, S_IRUGO, show_channel, NULL);
 614 static const DEVICE_ATTR(chip, S_IRUGO, show_chip, NULL);
 615 static const DEVICE_ATTR(output, S_IRUGO | S_IWUSR, show_output, store_output);
 616
 617 static const struct attribute *const netdev_sysfs_attrs[] = {
 618         &dev_attr_channel.attr,
 619         &dev_attr_chip.attr,
 620         &dev_attr_output.attr,
 621         NULL,
 622 };
 623 static const struct attribute_group netdev_sysfs_group = {
 624         .name = NULL,
 625         .attrs = (struct attribute **)netdev_sysfs_attrs,
 626 };
 627
 628 static const struct net_device_ops softing_netdev_ops = {
 629         .ndo_open = softing_netdev_open,
 630         .ndo_stop = softing_netdev_stop,
 631         .ndo_start_xmit = softing_netdev_start_xmit,
 632 };
 633
 634 static const struct can_bittiming_const softing_btr_const = {
 635         .name = "softing",
 636         .tseg1_min = 1,
 637         .tseg1_max = 16,
 638         .tseg2_min = 1,
 639         .tseg2_max = 8,
 640         .sjw_max = 4, /* overruled */
 641         .brp_min = 1,
 642         .brp_max = 32, /* overruled */
 643         .brp_inc = 1,
 644 };
 645
 646
 647 static struct net_device *softing_netdev_create(struct softing *card,
 648                                                 uint16_t chip_id)
 649 {
 650         struct net_device *netdev;
 651         struct softing_priv *priv;
 652
 653         netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX);
 654         if (!netdev) {
 655                 dev_alert(&card->pdev->dev, "alloc_candev failed\n");
 656                 return NULL;
 657         }
 658         priv = netdev_priv(netdev);
 659         priv->netdev = netdev;
 660         priv->card = card;
 661         memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const));
 662         priv->btr_const.brp_max = card->pdat->max_brp;
 663         priv->btr_const.sjw_max = card->pdat->max_sjw;
 664         priv->can.bittiming_const = &priv->btr_const;
 665         priv->can.clock.freq = 8000000;
 666         priv->chip = chip_id;
 667         priv->output = softing_default_output(netdev);
 668         SET_NETDEV_DEV(netdev, &card->pdev->dev);
 669
 670         netdev->flags |= IFF_ECHO;
 671         netdev->netdev_ops = &softing_netdev_ops;
 672         priv->can.do_set_mode = softing_candev_set_mode;
 673         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
 674
 675         return netdev;
 676 }
 677
 678 static int softing_netdev_register(struct net_device *netdev)
 679 {
 680         int ret;
 681
 682         netdev->sysfs_groups[0] = &netdev_sysfs_group;
 683         ret = register_candev(netdev);
 684         if (ret) {
 685                 dev_alert(&netdev->dev, "register failed\n");
 686                 return ret;
 687         }
 688         return 0;
 689 }
 690
 691 static void softing_netdev_cleanup(struct net_device *netdev)
 692 {
 693         unregister_candev(netdev);
 694         free_candev(netdev);
 695 }
 696
 697 /*
 698  * sysfs for Platform device
 699  */
 700 #define DEV_ATTR_RO(name, member) \
 701 static ssize_t show_##name(struct device *dev, \
 702                 struct device_attribute *attr, char *buf) \
 703 { \
 704         struct softing *card = platform_get_drvdata(to_platform_device(dev)); \
 705         return sprintf(buf, "%u\n", card->member); \
 706 } \
 707 static DEVICE_ATTR(name, 0444, show_##name, NULL)
 708
 709 #define DEV_ATTR_RO_STR(name, member) \
 710 static ssize_t show_##name(struct device *dev, \
 711                 struct device_attribute *attr, char *buf) \
 712 { \
 713         struct softing *card = platform_get_drvdata(to_platform_device(dev)); \
 714         return sprintf(buf, "%s\n", card->member); \
 715 } \
 716 static DEVICE_ATTR(name, 0444, show_##name, NULL)
 717
 718 DEV_ATTR_RO(serial, id.serial);
 719 DEV_ATTR_RO_STR(firmware, pdat->app.fw);
 720 DEV_ATTR_RO(firmware_version, id.fw_version);
 721 DEV_ATTR_RO_STR(hardware, pdat->name);
 722 DEV_ATTR_RO(hardware_version, id.hw_version);
 723 DEV_ATTR_RO(license, id.license);
 724 DEV_ATTR_RO(frequency, id.freq);
 725 DEV_ATTR_RO(txpending, tx.pending);
 726
 727 static struct attribute *softing_pdev_attrs[] = {
 728         &dev_attr_serial.attr,
 729         &dev_attr_firmware.attr,
 730         &dev_attr_firmware_version.attr,
 731         &dev_attr_hardware.attr,
 732         &dev_attr_hardware_version.attr,
 733         &dev_attr_license.attr,
 734         &dev_attr_frequency.attr,
 735         &dev_attr_txpending.attr,
 736         NULL,
 737 };
 738
 739 static const struct attribute_group softing_pdev_group = {
 740         .name = NULL,
 741         .attrs = softing_pdev_attrs,
 742 };
 743
 744 /*
 745  * platform driver
 746  */
 747 static int softing_pdev_remove(struct platform_device *pdev)
 748 {
 749         struct softing *card = platform_get_drvdata(pdev);
 750         int j;
 751
 752         /* first, disable card*/
 753         softing_card_shutdown(card);
 754
 755         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 756                 if (!card->net[j])
 757                         continue;
 758                 softing_netdev_cleanup(card->net[j]);
 759                 card->net[j] = NULL;
 760         }
 761         sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
 762
 763         iounmap(card->dpram);
 764         kfree(card);
 765         return 0;
 766 }
 767
 768 static int softing_pdev_probe(struct platform_device *pdev)
 769 {
 770         const struct softing_platform_data *pdat = dev_get_platdata(&pdev->dev);
 771         struct softing *card;
 772         struct net_device *netdev;
 773         struct softing_priv *priv;
 774         struct resource *pres;
 775         int ret;
 776         int j;
 777
 778         if (!pdat) {
 779                 dev_warn(&pdev->dev, "no platform data\n");
 780                 return -EINVAL;
 781         }
 782         if (pdat->nbus > ARRAY_SIZE(card->net)) {
 783                 dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus);
 784                 return -EINVAL;
 785         }
 786
 787         card = kzalloc(sizeof(*card), GFP_KERNEL);
 788         if (!card)
 789                 return -ENOMEM;
 790         card->pdat = pdat;
 791         card->pdev = pdev;
 792         platform_set_drvdata(pdev, card);
 793         mutex_init(&card->fw.lock);
 794         spin_lock_init(&card->spin);
 795
 796         ret = -EINVAL;
 797         pres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 798         if (!pres)
 799                 goto platform_resource_failed;
 800         card->dpram_phys = pres->start;
 801         card->dpram_size = resource_size(pres);
 802         card->dpram = ioremap_nocache(card->dpram_phys, card->dpram_size);
 803         if (!card->dpram) {
 804                 dev_alert(&card->pdev->dev, "dpram ioremap failed\n");
 805                 goto ioremap_failed;
 806         }
 807
 808         pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 809         if (pres)
 810                 card->irq.nr = pres->start;
 811
 812         /* reset card */
 813         ret = softing_card_boot(card);
 814         if (ret < 0) {
 815                 dev_alert(&pdev->dev, "failed to boot\n");
 816                 goto boot_failed;
 817         }
 818
 819         /* only now, the chip's are known */
 820         card->id.freq = card->pdat->freq;
 821
 822         ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group);
 823         if (ret < 0) {
 824                 dev_alert(&card->pdev->dev, "sysfs failed\n");
 825                 goto sysfs_failed;
 826         }
 827
 828         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 829                 card->net[j] = netdev =
 830                         softing_netdev_create(card, card->id.chip[j]);
 831                 if (!netdev) {
 832                         dev_alert(&pdev->dev, "failed to make can[%i]", j);
 833                         ret = -ENOMEM;
 834                         goto netdev_failed;
 835                 }
 836                 priv = netdev_priv(card->net[j]);
 837                 priv->index = j;
 838                 ret = softing_netdev_register(netdev);
 839                 if (ret) {
 840                         free_candev(netdev);
 841                         card->net[j] = NULL;
 842                         dev_alert(&card->pdev->dev,
 843                                         "failed to register can[%i]\n", j);
 844                         goto netdev_failed;
 845                 }
 846         }
 847         dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name);
 848         return 0;
 849
 850 netdev_failed:
 851         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 852                 if (!card->net[j])
 853                         continue;
 854                 softing_netdev_cleanup(card->net[j]);
 855         }
 856         sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
 857 sysfs_failed:
 858         softing_card_shutdown(card);
 859 boot_failed:
 860         iounmap(card->dpram);
 861 ioremap_failed:
 862 platform_resource_failed:
 863         kfree(card);
 864         return ret;
 865 }
 866
 867 static struct platform_driver softing_driver = {
 868         .driver = {
 869                 .name = "softing",
 870                 .owner = THIS_MODULE,
 871         },
 872         .probe = softing_pdev_probe,
 873         .remove = softing_pdev_remove,
 874 };
 875
 876 module_platform_driver(softing_driver);
 877
 878 MODULE_ALIAS("platform:softing");
 879 MODULE_DESCRIPTION("Softing DPRAM CAN driver");
 880 MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>");
 881 MODULE_LICENSE("GPL v2");