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, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <linux/interrupt.h>
  23 #include <asm/io.h>
  24
  25 #include "softing.h"
  26
  27 #define TX_ECHO_SKB_MAX (((TXMAX+1)/2)-1)
  28
  29 /*
  30  * test is a specific CAN netdev
  31  * is online (ie. up 'n running, not sleeping, not busoff
  32  */
  33 static inline int canif_is_active(struct net_device *netdev)
  34 {
  35         struct can_priv *can = netdev_priv(netdev);
  36
  37         if (!netif_running(netdev))
  38                 return 0;
  39         return (can->state <= CAN_STATE_ERROR_PASSIVE);
  40 }
  41
  42 /* reset DPRAM */
  43 static inline void softing_set_reset_dpram(struct softing *card)
  44 {
  45         if (card->pdat->generation >= 2) {
  46                 spin_lock_bh(&card->spin);
  47                 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) & ~1,
  48                                 &card->dpram[DPRAM_V2_RESET]);
  49                 spin_unlock_bh(&card->spin);
  50         }
  51 }
  52
  53 static inline void softing_clr_reset_dpram(struct softing *card)
  54 {
  55         if (card->pdat->generation >= 2) {
  56                 spin_lock_bh(&card->spin);
  57                 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) | 1,
  58                                 &card->dpram[DPRAM_V2_RESET]);
  59                 spin_unlock_bh(&card->spin);
  60         }
  61 }
  62
  63 /* trigger the tx queue-ing */
  64 static netdev_tx_t softing_netdev_start_xmit(struct sk_buff *skb,
  65                 struct net_device *dev)
  66 {
  67         struct softing_priv *priv = netdev_priv(dev);
  68         struct softing *card = priv->card;
  69         int ret;
  70         uint8_t *ptr;
  71         uint8_t fifo_wr, fifo_rd;
  72         struct can_frame *cf = (struct can_frame *)skb->data;
  73         uint8_t buf[DPRAM_TX_SIZE];
  74
  75         if (can_dropped_invalid_skb(dev, skb))
  76                 return NETDEV_TX_OK;
  77
  78         spin_lock(&card->spin);
  79
  80         ret = NETDEV_TX_BUSY;
  81         if (!card->fw.up ||
  82                         (card->tx.pending >= TXMAX) ||
  83                         (priv->tx.pending >= TX_ECHO_SKB_MAX))
  84                 goto xmit_done;
  85         fifo_wr = ioread8(&card->dpram[DPRAM_TX_WR]);
  86         fifo_rd = ioread8(&card->dpram[DPRAM_TX_RD]);
  87         if (fifo_wr == fifo_rd)
  88                 /* fifo full */
  89                 goto xmit_done;
  90         memset(buf, 0, sizeof(buf));
  91         ptr = buf;
  92         *ptr = CMD_TX;
  93         if (cf->can_id & CAN_RTR_FLAG)
  94                 *ptr |= CMD_RTR;
  95         if (cf->can_id & CAN_EFF_FLAG)
  96                 *ptr |= CMD_XTD;
  97         if (priv->index)
  98                 *ptr |= CMD_BUS2;
  99         ++ptr;
 100         *ptr++ = cf->can_dlc;
 101         *ptr++ = (cf->can_id >> 0);
 102         *ptr++ = (cf->can_id >> 8);
 103         if (cf->can_id & CAN_EFF_FLAG) {
 104                 *ptr++ = (cf->can_id >> 16);
 105                 *ptr++ = (cf->can_id >> 24);
 106         } else {
 107                 /* increment 1, not 2 as you might think */
 108                 ptr += 1;
 109         }
 110         if (!(cf->can_id & CAN_RTR_FLAG))
 111                 memcpy(ptr, &cf->data[0], cf->can_dlc);
 112         memcpy_toio(&card->dpram[DPRAM_TX + DPRAM_TX_SIZE * fifo_wr],
 113                         buf, DPRAM_TX_SIZE);
 114         if (++fifo_wr >= DPRAM_TX_CNT)
 115                 fifo_wr = 0;
 116         iowrite8(fifo_wr, &card->dpram[DPRAM_TX_WR]);
 117         card->tx.last_bus = priv->index;
 118         ++card->tx.pending;
 119         ++priv->tx.pending;
 120         can_put_echo_skb(skb, dev, priv->tx.echo_put);
 121         ++priv->tx.echo_put;
 122         if (priv->tx.echo_put >= TX_ECHO_SKB_MAX)
 123                 priv->tx.echo_put = 0;
 124         /* can_put_echo_skb() saves the skb, safe to return TX_OK */
 125         ret = NETDEV_TX_OK;
 126 xmit_done:
 127         spin_unlock(&card->spin);
 128         if (card->tx.pending >= TXMAX) {
 129                 int j;
 130                 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 131                         if (card->net[j])
 132                                 netif_stop_queue(card->net[j]);
 133                 }
 134         }
 135         if (ret != NETDEV_TX_OK)
 136                 netif_stop_queue(dev);
 137
 138         return ret;
 139 }
 140
 141 /*
 142  * shortcut for skb delivery
 143  */
 144 int softing_netdev_rx(struct net_device *netdev, const struct can_frame *msg,
 145                 ktime_t ktime)
 146 {
 147         struct sk_buff *skb;
 148         struct can_frame *cf;
 149
 150         skb = alloc_can_skb(netdev, &cf);
 151         if (!skb)
 152                 return -ENOMEM;
 153         memcpy(cf, msg, sizeof(*msg));
 154         skb->tstamp = ktime;
 155         return netif_rx(skb);
 156 }
 157
 158 /*
 159  * softing_handle_1
 160  * pop 1 entry from the DPRAM queue, and process
 161  */
 162 static int softing_handle_1(struct softing *card)
 163 {
 164         struct net_device *netdev;
 165         struct softing_priv *priv;
 166         ktime_t ktime;
 167         struct can_frame msg;
 168         int cnt = 0, lost_msg;
 169         uint8_t fifo_rd, fifo_wr, cmd;
 170         uint8_t *ptr;
 171         uint32_t tmp_u32;
 172         uint8_t buf[DPRAM_RX_SIZE];
 173
 174         memset(&msg, 0, sizeof(msg));
 175         /* test for lost msgs */
 176         lost_msg = ioread8(&card->dpram[DPRAM_RX_LOST]);
 177         if (lost_msg) {
 178                 int j;
 179                 /* reset condition */
 180                 iowrite8(0, &card->dpram[DPRAM_RX_LOST]);
 181                 /* prepare msg */
 182                 msg.can_id = CAN_ERR_FLAG | CAN_ERR_CRTL;
 183                 msg.can_dlc = CAN_ERR_DLC;
 184                 msg.data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 185                 /*
 186                  * service to all busses, we don't know which it was applicable
 187                  * but only service busses that are online
 188                  */
 189                 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 190                         netdev = card->net[j];
 191                         if (!netdev)
 192                                 continue;
 193                         if (!canif_is_active(netdev))
 194                                 /* a dead bus has no overflows */
 195                                 continue;
 196                         ++netdev->stats.rx_over_errors;
 197                         softing_netdev_rx(netdev, &msg, ktime_set(0, 0));
 198                 }
 199                 /* prepare for other use */
 200                 memset(&msg, 0, sizeof(msg));
 201                 ++cnt;
 202         }
 203
 204         fifo_rd = ioread8(&card->dpram[DPRAM_RX_RD]);
 205         fifo_wr = ioread8(&card->dpram[DPRAM_RX_WR]);
 206
 207         if (++fifo_rd >= DPRAM_RX_CNT)
 208                 fifo_rd = 0;
 209         if (fifo_wr == fifo_rd)
 210                 return cnt;
 211
 212         memcpy_fromio(buf, &card->dpram[DPRAM_RX + DPRAM_RX_SIZE*fifo_rd],
 213                         DPRAM_RX_SIZE);
 214         mb();
 215         /* trigger dual port RAM */
 216         iowrite8(fifo_rd, &card->dpram[DPRAM_RX_RD]);
 217
 218         ptr = buf;
 219         cmd = *ptr++;
 220         if (cmd == 0xff)
 221                 /* not quite useful, probably the card has got out */
 222                 return 0;
 223         netdev = card->net[0];
 224         if (cmd & CMD_BUS2)
 225                 netdev = card->net[1];
 226         priv = netdev_priv(netdev);
 227
 228         if (cmd & CMD_ERR) {
 229                 uint8_t can_state, state;
 230
 231                 state = *ptr++;
 232
 233                 msg.can_id = CAN_ERR_FLAG;
 234                 msg.can_dlc = CAN_ERR_DLC;
 235
 236                 if (state & SF_MASK_BUSOFF) {
 237                         can_state = CAN_STATE_BUS_OFF;
 238                         msg.can_id |= CAN_ERR_BUSOFF;
 239                         state = STATE_BUSOFF;
 240                 } else if (state & SF_MASK_EPASSIVE) {
 241                         can_state = CAN_STATE_ERROR_PASSIVE;
 242                         msg.can_id |= CAN_ERR_CRTL;
 243                         msg.data[1] = CAN_ERR_CRTL_TX_PASSIVE;
 244                         state = STATE_EPASSIVE;
 245                 } else {
 246                         can_state = CAN_STATE_ERROR_ACTIVE;
 247                         msg.can_id |= CAN_ERR_CRTL;
 248                         state = STATE_EACTIVE;
 249                 }
 250                 /* update DPRAM */
 251                 iowrite8(state, &card->dpram[priv->index ?
 252                                 DPRAM_INFO_BUSSTATE2 : DPRAM_INFO_BUSSTATE]);
 253                 /* timestamp */
 254                 tmp_u32 = le32_to_cpup((void *)ptr);
 255                 ptr += 4;
 256                 ktime = softing_raw2ktime(card, tmp_u32);
 257
 258                 ++netdev->stats.rx_errors;
 259                 /* update internal status */
 260                 if (can_state != priv->can.state) {
 261                         priv->can.state = can_state;
 262                         if (can_state == CAN_STATE_ERROR_PASSIVE)
 263                                 ++priv->can.can_stats.error_passive;
 264                         else if (can_state == CAN_STATE_BUS_OFF) {
 265                                 /* this calls can_close_cleanup() */
 266                                 can_bus_off(netdev);
 267                                 netif_stop_queue(netdev);
 268                         }
 269                         /* trigger socketcan */
 270                         softing_netdev_rx(netdev, &msg, ktime);
 271                 }
 272
 273         } else {
 274                 if (cmd & CMD_RTR)
 275                         msg.can_id |= CAN_RTR_FLAG;
 276                 msg.can_dlc = get_can_dlc(*ptr++);
 277                 if (cmd & CMD_XTD) {
 278                         msg.can_id |= CAN_EFF_FLAG;
 279                         msg.can_id |= le32_to_cpup((void *)ptr);
 280                         ptr += 4;
 281                 } else {
 282                         msg.can_id |= le16_to_cpup((void *)ptr);
 283                         ptr += 2;
 284                 }
 285                 /* timestamp */
 286                 tmp_u32 = le32_to_cpup((void *)ptr);
 287                 ptr += 4;
 288                 ktime = softing_raw2ktime(card, tmp_u32);
 289                 if (!(msg.can_id & CAN_RTR_FLAG))
 290                         memcpy(&msg.data[0], ptr, 8);
 291                 ptr += 8;
 292                 /* update socket */
 293                 if (cmd & CMD_ACK) {
 294                         /* acknowledge, was tx msg */
 295                         struct sk_buff *skb;
 296                         skb = priv->can.echo_skb[priv->tx.echo_get];
 297                         if (skb)
 298                                 skb->tstamp = ktime;
 299                         can_get_echo_skb(netdev, priv->tx.echo_get);
 300                         ++priv->tx.echo_get;
 301                         if (priv->tx.echo_get >= TX_ECHO_SKB_MAX)
 302                                 priv->tx.echo_get = 0;
 303                         if (priv->tx.pending)
 304                                 --priv->tx.pending;
 305                         if (card->tx.pending)
 306                                 --card->tx.pending;
 307                         ++netdev->stats.tx_packets;
 308                         if (!(msg.can_id & CAN_RTR_FLAG))
 309                                 netdev->stats.tx_bytes += msg.can_dlc;
 310                 } else {
 311                         int ret;
 312
 313                         ret = softing_netdev_rx(netdev, &msg, ktime);
 314                         if (ret == NET_RX_SUCCESS) {
 315                                 ++netdev->stats.rx_packets;
 316                                 if (!(msg.can_id & CAN_RTR_FLAG))
 317                                         netdev->stats.rx_bytes += msg.can_dlc;
 318                         } else {
 319                                 ++netdev->stats.rx_dropped;
 320                         }
 321                 }
 322         }
 323         ++cnt;
 324         return cnt;
 325 }
 326
 327 /*
 328  * real interrupt handler
 329  */
 330 static irqreturn_t softing_irq_thread(int irq, void *dev_id)
 331 {
 332         struct softing *card = (struct softing *)dev_id;
 333         struct net_device *netdev;
 334         struct softing_priv *priv;
 335         int j, offset, work_done;
 336
 337         work_done = 0;
 338         spin_lock_bh(&card->spin);
 339         while (softing_handle_1(card) > 0) {
 340                 ++card->irq.svc_count;
 341                 ++work_done;
 342         }
 343         spin_unlock_bh(&card->spin);
 344         /* resume tx queue's */
 345         offset = card->tx.last_bus;
 346         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 347                 if (card->tx.pending >= TXMAX)
 348                         break;
 349                 netdev = card->net[(j + offset + 1) % card->pdat->nbus];
 350                 if (!netdev)
 351                         continue;
 352                 priv = netdev_priv(netdev);
 353                 if (!canif_is_active(netdev))
 354                         /* it makes no sense to wake dead busses */
 355                         continue;
 356                 if (priv->tx.pending >= TX_ECHO_SKB_MAX)
 357                         continue;
 358                 ++work_done;
 359                 netif_wake_queue(netdev);
 360         }
 361         return work_done ? IRQ_HANDLED : IRQ_NONE;
 362 }
 363
 364 /*
 365  * interrupt routines:
 366  * schedule the 'real interrupt handler'
 367  */
 368 static irqreturn_t softing_irq_v2(int irq, void *dev_id)
 369 {
 370         struct softing *card = (struct softing *)dev_id;
 371         uint8_t ir;
 372
 373         ir = ioread8(&card->dpram[DPRAM_V2_IRQ_TOHOST]);
 374         iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]);
 375         return (1 == ir) ? IRQ_WAKE_THREAD : IRQ_NONE;
 376 }
 377
 378 static irqreturn_t softing_irq_v1(int irq, void *dev_id)
 379 {
 380         struct softing *card = (struct softing *)dev_id;
 381         uint8_t ir;
 382
 383         ir = ioread8(&card->dpram[DPRAM_IRQ_TOHOST]);
 384         iowrite8(0, &card->dpram[DPRAM_IRQ_TOHOST]);
 385         return ir ? IRQ_WAKE_THREAD : IRQ_NONE;
 386 }
 387
 388 /*
 389  * netdev/candev inter-operability
 390  */
 391 static int softing_netdev_open(struct net_device *ndev)
 392 {
 393         int ret;
 394
 395         /* check or determine and set bittime */
 396         ret = open_candev(ndev);
 397         if (!ret)
 398                 ret = softing_startstop(ndev, 1);
 399         return ret;
 400 }
 401
 402 static int softing_netdev_stop(struct net_device *ndev)
 403 {
 404         int ret;
 405
 406         netif_stop_queue(ndev);
 407
 408         /* softing cycle does close_candev() */
 409         ret = softing_startstop(ndev, 0);
 410         return ret;
 411 }
 412
 413 static int softing_candev_set_mode(struct net_device *ndev, enum can_mode mode)
 414 {
 415         int ret;
 416
 417         switch (mode) {
 418         case CAN_MODE_START:
 419                 /* softing_startstop does close_candev() */
 420                 ret = softing_startstop(ndev, 1);
 421                 return ret;
 422         case CAN_MODE_STOP:
 423         case CAN_MODE_SLEEP:
 424                 return -EOPNOTSUPP;
 425         }
 426         return 0;
 427 }
 428
 429 /*
 430  * Softing device management helpers
 431  */
 432 int softing_enable_irq(struct softing *card, int enable)
 433 {
 434         int ret;
 435
 436         if (!card->irq.nr) {
 437                 return 0;
 438         } else if (card->irq.requested && !enable) {
 439                 free_irq(card->irq.nr, card);
 440                 card->irq.requested = 0;
 441         } else if (!card->irq.requested && enable) {
 442                 ret = request_threaded_irq(card->irq.nr,
 443                                 (card->pdat->generation >= 2) ?
 444                                         softing_irq_v2 : softing_irq_v1,
 445                                 softing_irq_thread, IRQF_SHARED,
 446                                 dev_name(&card->pdev->dev), card);
 447                 if (ret) {
 448                         dev_alert(&card->pdev->dev,
 449                                         "request_threaded_irq(%u) failed\n",
 450                                         card->irq.nr);
 451                         return ret;
 452                 }
 453                 card->irq.requested = 1;
 454         }
 455         return 0;
 456 }
 457
 458 static void softing_card_shutdown(struct softing *card)
 459 {
 460         int fw_up = 0;
 461
 462         if (mutex_lock_interruptible(&card->fw.lock))
 463                 /* return -ERESTARTSYS */;
 464         fw_up = card->fw.up;
 465         card->fw.up = 0;
 466
 467         if (card->irq.requested && card->irq.nr) {
 468                 free_irq(card->irq.nr, card);
 469                 card->irq.requested = 0;
 470         }
 471         if (fw_up) {
 472                 if (card->pdat->enable_irq)
 473                         card->pdat->enable_irq(card->pdev, 0);
 474                 softing_set_reset_dpram(card);
 475                 if (card->pdat->reset)
 476                         card->pdat->reset(card->pdev, 1);
 477         }
 478         mutex_unlock(&card->fw.lock);
 479 }
 480
 481 static int softing_card_boot(struct softing *card)
 482 {
 483         int ret, j;
 484         static const uint8_t stream[] = {
 485                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, };
 486         unsigned char back[sizeof(stream)];
 487
 488         if (mutex_lock_interruptible(&card->fw.lock))
 489                 return -ERESTARTSYS;
 490         if (card->fw.up) {
 491                 mutex_unlock(&card->fw.lock);
 492                 return 0;
 493         }
 494         /* reset board */
 495         if (card->pdat->enable_irq)
 496                 card->pdat->enable_irq(card->pdev, 1);
 497         /* boot card */
 498         softing_set_reset_dpram(card);
 499         if (card->pdat->reset)
 500                 card->pdat->reset(card->pdev, 1);
 501         for (j = 0; (j + sizeof(stream)) < card->dpram_size;
 502                         j += sizeof(stream)) {
 503
 504                 memcpy_toio(&card->dpram[j], stream, sizeof(stream));
 505                 /* flush IO cache */
 506                 mb();
 507                 memcpy_fromio(back, &card->dpram[j], sizeof(stream));
 508
 509                 if (!memcmp(back, stream, sizeof(stream)))
 510                         continue;
 511                 /* memory is not equal */
 512                 dev_alert(&card->pdev->dev, "dpram failed at 0x%04x\n", j);
 513                 ret = -EIO;
 514                 goto failed;
 515         }
 516         wmb();
 517         /* load boot firmware */
 518         ret = softing_load_fw(card->pdat->boot.fw, card, card->dpram,
 519                                 card->dpram_size,
 520                                 card->pdat->boot.offs - card->pdat->boot.addr);
 521         if (ret < 0)
 522                 goto failed;
 523         /* load loader firmware */
 524         ret = softing_load_fw(card->pdat->load.fw, card, card->dpram,
 525                                 card->dpram_size,
 526                                 card->pdat->load.offs - card->pdat->load.addr);
 527         if (ret < 0)
 528                 goto failed;
 529
 530         if (card->pdat->reset)
 531                 card->pdat->reset(card->pdev, 0);
 532         softing_clr_reset_dpram(card);
 533         ret = softing_bootloader_command(card, 0, "card boot");
 534         if (ret < 0)
 535                 goto failed;
 536         ret = softing_load_app_fw(card->pdat->app.fw, card);
 537         if (ret < 0)
 538                 goto failed;
 539
 540         ret = softing_chip_poweron(card);
 541         if (ret < 0)
 542                 goto failed;
 543
 544         card->fw.up = 1;
 545         mutex_unlock(&card->fw.lock);
 546         return 0;
 547 failed:
 548         card->fw.up = 0;
 549         if (card->pdat->enable_irq)
 550                 card->pdat->enable_irq(card->pdev, 0);
 551         softing_set_reset_dpram(card);
 552         if (card->pdat->reset)
 553                 card->pdat->reset(card->pdev, 1);
 554         mutex_unlock(&card->fw.lock);
 555         return ret;
 556 }
 557
 558 /*
 559  * netdev sysfs
 560  */
 561 static ssize_t show_channel(struct device *dev, struct device_attribute *attr,
 562                 char *buf)
 563 {
 564         struct net_device *ndev = to_net_dev(dev);
 565         struct softing_priv *priv = netdev2softing(ndev);
 566
 567         return sprintf(buf, "%i\n", priv->index);
 568 }
 569
 570 static ssize_t show_chip(struct device *dev, struct device_attribute *attr,
 571                 char *buf)
 572 {
 573         struct net_device *ndev = to_net_dev(dev);
 574         struct softing_priv *priv = netdev2softing(ndev);
 575
 576         return sprintf(buf, "%i\n", priv->chip);
 577 }
 578
 579 static ssize_t show_output(struct device *dev, struct device_attribute *attr,
 580                 char *buf)
 581 {
 582         struct net_device *ndev = to_net_dev(dev);
 583         struct softing_priv *priv = netdev2softing(ndev);
 584
 585         return sprintf(buf, "0x%02x\n", priv->output);
 586 }
 587
 588 static ssize_t store_output(struct device *dev, struct device_attribute *attr,
 589                 const char *buf, size_t count)
 590 {
 591         struct net_device *ndev = to_net_dev(dev);
 592         struct softing_priv *priv = netdev2softing(ndev);
 593         struct softing *card = priv->card;
 594         unsigned long val;
 595         int ret;
 596
 597         ret = kstrtoul(buf, 0, &val);
 598         if (ret < 0)
 599                 return ret;
 600         val &= 0xFF;
 601
 602         ret = mutex_lock_interruptible(&card->fw.lock);
 603         if (ret)
 604                 return -ERESTARTSYS;
 605         if (netif_running(ndev)) {
 606                 mutex_unlock(&card->fw.lock);
 607                 return -EBUSY;
 608         }
 609         priv->output = val;
 610         mutex_unlock(&card->fw.lock);
 611         return count;
 612 }
 613
 614 static const DEVICE_ATTR(channel, S_IRUGO, show_channel, NULL);
 615 static const DEVICE_ATTR(chip, S_IRUGO, show_chip, NULL);
 616 static const DEVICE_ATTR(output, S_IRUGO | S_IWUSR, show_output, store_output);
 617
 618 static const struct attribute *const netdev_sysfs_attrs[] = {
 619         &dev_attr_channel.attr,
 620         &dev_attr_chip.attr,
 621         &dev_attr_output.attr,
 622         NULL,
 623 };
 624 static const struct attribute_group netdev_sysfs_group = {
 625         .name = NULL,
 626         .attrs = (struct attribute **)netdev_sysfs_attrs,
 627 };
 628
 629 static const struct net_device_ops softing_netdev_ops = {
 630         .ndo_open = softing_netdev_open,
 631         .ndo_stop = softing_netdev_stop,
 632         .ndo_start_xmit = softing_netdev_start_xmit,
 633 };
 634
 635 static const struct can_bittiming_const softing_btr_const = {
 636         .name = "softing",
 637         .tseg1_min = 1,
 638         .tseg1_max = 16,
 639         .tseg2_min = 1,
 640         .tseg2_max = 8,
 641         .sjw_max = 4, /* overruled */
 642         .brp_min = 1,
 643         .brp_max = 32, /* overruled */
 644         .brp_inc = 1,
 645 };
 646
 647
 648 static struct net_device *softing_netdev_create(struct softing *card,
 649                                                 uint16_t chip_id)
 650 {
 651         struct net_device *netdev;
 652         struct softing_priv *priv;
 653
 654         netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX);
 655         if (!netdev) {
 656                 dev_alert(&card->pdev->dev, "alloc_candev failed\n");
 657                 return NULL;
 658         }
 659         priv = netdev_priv(netdev);
 660         priv->netdev = netdev;
 661         priv->card = card;
 662         memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const));
 663         priv->btr_const.brp_max = card->pdat->max_brp;
 664         priv->btr_const.sjw_max = card->pdat->max_sjw;
 665         priv->can.bittiming_const = &priv->btr_const;
 666         priv->can.clock.freq = 8000000;
 667         priv->chip = chip_id;
 668         priv->output = softing_default_output(netdev);
 669         SET_NETDEV_DEV(netdev, &card->pdev->dev);
 670
 671         netdev->flags |= IFF_ECHO;
 672         netdev->netdev_ops = &softing_netdev_ops;
 673         priv->can.do_set_mode = softing_candev_set_mode;
 674         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
 675
 676         return netdev;
 677 }
 678
 679 static int softing_netdev_register(struct net_device *netdev)
 680 {
 681         int ret;
 682
 683         netdev->sysfs_groups[0] = &netdev_sysfs_group;
 684         ret = register_candev(netdev);
 685         if (ret) {
 686                 dev_alert(&netdev->dev, "register failed\n");
 687                 return ret;
 688         }
 689         return 0;
 690 }
 691
 692 static void softing_netdev_cleanup(struct net_device *netdev)
 693 {
 694         unregister_candev(netdev);
 695         free_candev(netdev);
 696 }
 697
 698 /*
 699  * sysfs for Platform device
 700  */
 701 #define DEV_ATTR_RO(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, "%u\n", card->member); \
 707 } \
 708 static DEVICE_ATTR(name, 0444, show_##name, NULL)
 709
 710 #define DEV_ATTR_RO_STR(name, member) \
 711 static ssize_t show_##name(struct device *dev, \
 712                 struct device_attribute *attr, char *buf) \
 713 { \
 714         struct softing *card = platform_get_drvdata(to_platform_device(dev)); \
 715         return sprintf(buf, "%s\n", card->member); \
 716 } \
 717 static DEVICE_ATTR(name, 0444, show_##name, NULL)
 718
 719 DEV_ATTR_RO(serial, id.serial);
 720 DEV_ATTR_RO_STR(firmware, pdat->app.fw);
 721 DEV_ATTR_RO(firmware_version, id.fw_version);
 722 DEV_ATTR_RO_STR(hardware, pdat->name);
 723 DEV_ATTR_RO(hardware_version, id.hw_version);
 724 DEV_ATTR_RO(license, id.license);
 725 DEV_ATTR_RO(frequency, id.freq);
 726 DEV_ATTR_RO(txpending, tx.pending);
 727
 728 static struct attribute *softing_pdev_attrs[] = {
 729         &dev_attr_serial.attr,
 730         &dev_attr_firmware.attr,
 731         &dev_attr_firmware_version.attr,
 732         &dev_attr_hardware.attr,
 733         &dev_attr_hardware_version.attr,
 734         &dev_attr_license.attr,
 735         &dev_attr_frequency.attr,
 736         &dev_attr_txpending.attr,
 737         NULL,
 738 };
 739
 740 static const struct attribute_group softing_pdev_group = {
 741         .name = NULL,
 742         .attrs = softing_pdev_attrs,
 743 };
 744
 745 /*
 746  * platform driver
 747  */
 748 static int softing_pdev_remove(struct platform_device *pdev)
 749 {
 750         struct softing *card = platform_get_drvdata(pdev);
 751         int j;
 752
 753         /* first, disable card*/
 754         softing_card_shutdown(card);
 755
 756         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 757                 if (!card->net[j])
 758                         continue;
 759                 softing_netdev_cleanup(card->net[j]);
 760                 card->net[j] = NULL;
 761         }
 762         sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
 763
 764         iounmap(card->dpram);
 765         kfree(card);
 766         return 0;
 767 }
 768
 769 static int softing_pdev_probe(struct platform_device *pdev)
 770 {
 771         const struct softing_platform_data *pdat = pdev->dev.platform_data;
 772         struct softing *card;
 773         struct net_device *netdev;
 774         struct softing_priv *priv;
 775         struct resource *pres;
 776         int ret;
 777         int j;
 778
 779         if (!pdat) {
 780                 dev_warn(&pdev->dev, "no platform data\n");
 781                 return -EINVAL;
 782         }
 783         if (pdat->nbus > ARRAY_SIZE(card->net)) {
 784                 dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus);
 785                 return -EINVAL;
 786         }
 787
 788         card = kzalloc(sizeof(*card), GFP_KERNEL);
 789         if (!card)
 790                 return -ENOMEM;
 791         card->pdat = pdat;
 792         card->pdev = pdev;
 793         platform_set_drvdata(pdev, card);
 794         mutex_init(&card->fw.lock);
 795         spin_lock_init(&card->spin);
 796
 797         ret = -EINVAL;
 798         pres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 799         if (!pres)
 800                 goto platform_resource_failed;
 801         card->dpram_phys = pres->start;
 802         card->dpram_size = resource_size(pres);
 803         card->dpram = ioremap_nocache(card->dpram_phys, card->dpram_size);
 804         if (!card->dpram) {
 805                 dev_alert(&card->pdev->dev, "dpram ioremap failed\n");
 806                 goto ioremap_failed;
 807         }
 808
 809         pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 810         if (pres)
 811                 card->irq.nr = pres->start;
 812
 813         /* reset card */
 814         ret = softing_card_boot(card);
 815         if (ret < 0) {
 816                 dev_alert(&pdev->dev, "failed to boot\n");
 817                 goto boot_failed;
 818         }
 819
 820         /* only now, the chip's are known */
 821         card->id.freq = card->pdat->freq;
 822
 823         ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group);
 824         if (ret < 0) {
 825                 dev_alert(&card->pdev->dev, "sysfs failed\n");
 826                 goto sysfs_failed;
 827         }
 828
 829         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 830                 card->net[j] = netdev =
 831                         softing_netdev_create(card, card->id.chip[j]);
 832                 if (!netdev) {
 833                         dev_alert(&pdev->dev, "failed to make can[%i]", j);
 834                         ret = -ENOMEM;
 835                         goto netdev_failed;
 836                 }
 837                 priv = netdev_priv(card->net[j]);
 838                 priv->index = j;
 839                 ret = softing_netdev_register(netdev);
 840                 if (ret) {
 841                         free_candev(netdev);
 842                         card->net[j] = NULL;
 843                         dev_alert(&card->pdev->dev,
 844                                         "failed to register can[%i]\n", j);
 845                         goto netdev_failed;
 846                 }
 847         }
 848         dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name);
 849         return 0;
 850
 851 netdev_failed:
 852         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 853                 if (!card->net[j])
 854                         continue;
 855                 softing_netdev_cleanup(card->net[j]);
 856         }
 857         sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
 858 sysfs_failed:
 859         softing_card_shutdown(card);
 860 boot_failed:
 861         iounmap(card->dpram);
 862 ioremap_failed:
 863 platform_resource_failed:
 864         kfree(card);
 865         return ret;
 866 }
 867
 868 static struct platform_driver softing_driver = {
 869         .driver = {
 870                 .name = "softing",
 871                 .owner = THIS_MODULE,
 872         },
 873         .probe = softing_pdev_probe,
 874         .remove = softing_pdev_remove,
 875 };
 876
 877 module_platform_driver(softing_driver);
 878
 879 MODULE_ALIAS("platform:softing");
 880 MODULE_DESCRIPTION("Softing DPRAM CAN driver");
 881 MODULE_AUTHOR("Kurt Van Dijck <[email protected]>");
 882 MODULE_LICENSE("GPL v2");