linux/drivers/net/can/softing/softing_main.c
<<
>>
Prefs
   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 */
  31static 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 */
  41static 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
  51static 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 */
  62static 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;
 124xmit_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 */
 142int 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 */
 160static 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                                ++priv->can.can_stats.bus_off;
 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 */
 329static 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 */
 367static 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
 377static 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 */
 390static 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
 401static 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
 412static 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 */
 431int 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
 457static 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
 480static 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;
 546failed:
 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 */
 560static ssize_t show_chip(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->chip);
 567}
 568
 569static ssize_t show_output(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, "0x%02x\n", priv->output);
 576}
 577
 578static ssize_t store_output(struct device *dev, struct device_attribute *attr,
 579                const char *buf, size_t count)
 580{
 581        struct net_device *ndev = to_net_dev(dev);
 582        struct softing_priv *priv = netdev2softing(ndev);
 583        struct softing *card = priv->card;
 584        unsigned long val;
 585        int ret;
 586
 587        ret = kstrtoul(buf, 0, &val);
 588        if (ret < 0)
 589                return ret;
 590        val &= 0xFF;
 591
 592        ret = mutex_lock_interruptible(&card->fw.lock);
 593        if (ret)
 594                return -ERESTARTSYS;
 595        if (netif_running(ndev)) {
 596                mutex_unlock(&card->fw.lock);
 597                return -EBUSY;
 598        }
 599        priv->output = val;
 600        mutex_unlock(&card->fw.lock);
 601        return count;
 602}
 603
 604static const DEVICE_ATTR(chip, S_IRUGO, show_chip, NULL);
 605static const DEVICE_ATTR(output, S_IRUGO | S_IWUSR, show_output, store_output);
 606
 607static const struct attribute *const netdev_sysfs_attrs[] = {
 608        &dev_attr_chip.attr,
 609        &dev_attr_output.attr,
 610        NULL,
 611};
 612static const struct attribute_group netdev_sysfs_group = {
 613        .name = NULL,
 614        .attrs = (struct attribute **)netdev_sysfs_attrs,
 615};
 616
 617static const struct net_device_ops softing_netdev_ops = {
 618        .ndo_open = softing_netdev_open,
 619        .ndo_stop = softing_netdev_stop,
 620        .ndo_start_xmit = softing_netdev_start_xmit,
 621        .ndo_change_mtu = can_change_mtu,
 622};
 623
 624static const struct can_bittiming_const softing_btr_const = {
 625        .name = "softing",
 626        .tseg1_min = 1,
 627        .tseg1_max = 16,
 628        .tseg2_min = 1,
 629        .tseg2_max = 8,
 630        .sjw_max = 4, /* overruled */
 631        .brp_min = 1,
 632        .brp_max = 32, /* overruled */
 633        .brp_inc = 1,
 634};
 635
 636
 637static struct net_device *softing_netdev_create(struct softing *card,
 638                                                uint16_t chip_id)
 639{
 640        struct net_device *netdev;
 641        struct softing_priv *priv;
 642
 643        netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX);
 644        if (!netdev) {
 645                dev_alert(&card->pdev->dev, "alloc_candev failed\n");
 646                return NULL;
 647        }
 648        priv = netdev_priv(netdev);
 649        priv->netdev = netdev;
 650        priv->card = card;
 651        memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const));
 652        priv->btr_const.brp_max = card->pdat->max_brp;
 653        priv->btr_const.sjw_max = card->pdat->max_sjw;
 654        priv->can.bittiming_const = &priv->btr_const;
 655        priv->can.clock.freq = 8000000;
 656        priv->chip = chip_id;
 657        priv->output = softing_default_output(netdev);
 658        SET_NETDEV_DEV(netdev, &card->pdev->dev);
 659
 660        netdev->flags |= IFF_ECHO;
 661        netdev->netdev_ops = &softing_netdev_ops;
 662        priv->can.do_set_mode = softing_candev_set_mode;
 663        priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
 664
 665        return netdev;
 666}
 667
 668static int softing_netdev_register(struct net_device *netdev)
 669{
 670        int ret;
 671
 672        ret = register_candev(netdev);
 673        if (ret) {
 674                dev_alert(&netdev->dev, "register failed\n");
 675                return ret;
 676        }
 677        if (sysfs_create_group(&netdev->dev.kobj, &netdev_sysfs_group) < 0)
 678                netdev_alert(netdev, "sysfs group failed\n");
 679
 680        return 0;
 681}
 682
 683static void softing_netdev_cleanup(struct net_device *netdev)
 684{
 685        sysfs_remove_group(&netdev->dev.kobj, &netdev_sysfs_group);
 686        unregister_candev(netdev);
 687        free_candev(netdev);
 688}
 689
 690/*
 691 * sysfs for Platform device
 692 */
 693#define DEV_ATTR_RO(name, member) \
 694static ssize_t show_##name(struct device *dev, \
 695                struct device_attribute *attr, char *buf) \
 696{ \
 697        struct softing *card = platform_get_drvdata(to_platform_device(dev)); \
 698        return sprintf(buf, "%u\n", card->member); \
 699} \
 700static DEVICE_ATTR(name, 0444, show_##name, NULL)
 701
 702#define DEV_ATTR_RO_STR(name, member) \
 703static ssize_t show_##name(struct device *dev, \
 704                struct device_attribute *attr, char *buf) \
 705{ \
 706        struct softing *card = platform_get_drvdata(to_platform_device(dev)); \
 707        return sprintf(buf, "%s\n", card->member); \
 708} \
 709static DEVICE_ATTR(name, 0444, show_##name, NULL)
 710
 711DEV_ATTR_RO(serial, id.serial);
 712DEV_ATTR_RO_STR(firmware, pdat->app.fw);
 713DEV_ATTR_RO(firmware_version, id.fw_version);
 714DEV_ATTR_RO_STR(hardware, pdat->name);
 715DEV_ATTR_RO(hardware_version, id.hw_version);
 716DEV_ATTR_RO(license, id.license);
 717
 718static struct attribute *softing_pdev_attrs[] = {
 719        &dev_attr_serial.attr,
 720        &dev_attr_firmware.attr,
 721        &dev_attr_firmware_version.attr,
 722        &dev_attr_hardware.attr,
 723        &dev_attr_hardware_version.attr,
 724        &dev_attr_license.attr,
 725        NULL,
 726};
 727
 728static const struct attribute_group softing_pdev_group = {
 729        .name = NULL,
 730        .attrs = softing_pdev_attrs,
 731};
 732
 733/*
 734 * platform driver
 735 */
 736static int softing_pdev_remove(struct platform_device *pdev)
 737{
 738        struct softing *card = platform_get_drvdata(pdev);
 739        int j;
 740
 741        /* first, disable card*/
 742        softing_card_shutdown(card);
 743
 744        for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 745                if (!card->net[j])
 746                        continue;
 747                softing_netdev_cleanup(card->net[j]);
 748                card->net[j] = NULL;
 749        }
 750        sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
 751
 752        iounmap(card->dpram);
 753        kfree(card);
 754        return 0;
 755}
 756
 757static int softing_pdev_probe(struct platform_device *pdev)
 758{
 759        const struct softing_platform_data *pdat = dev_get_platdata(&pdev->dev);
 760        struct softing *card;
 761        struct net_device *netdev;
 762        struct softing_priv *priv;
 763        struct resource *pres;
 764        int ret;
 765        int j;
 766
 767        if (!pdat) {
 768                dev_warn(&pdev->dev, "no platform data\n");
 769                return -EINVAL;
 770        }
 771        if (pdat->nbus > ARRAY_SIZE(card->net)) {
 772                dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus);
 773                return -EINVAL;
 774        }
 775
 776        card = kzalloc(sizeof(*card), GFP_KERNEL);
 777        if (!card)
 778                return -ENOMEM;
 779        card->pdat = pdat;
 780        card->pdev = pdev;
 781        platform_set_drvdata(pdev, card);
 782        mutex_init(&card->fw.lock);
 783        spin_lock_init(&card->spin);
 784
 785        ret = -EINVAL;
 786        pres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 787        if (!pres)
 788                goto platform_resource_failed;
 789        card->dpram_phys = pres->start;
 790        card->dpram_size = resource_size(pres);
 791        card->dpram = ioremap_nocache(card->dpram_phys, card->dpram_size);
 792        if (!card->dpram) {
 793                dev_alert(&card->pdev->dev, "dpram ioremap failed\n");
 794                goto ioremap_failed;
 795        }
 796
 797        pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 798        if (pres)
 799                card->irq.nr = pres->start;
 800
 801        /* reset card */
 802        ret = softing_card_boot(card);
 803        if (ret < 0) {
 804                dev_alert(&pdev->dev, "failed to boot\n");
 805                goto boot_failed;
 806        }
 807
 808        /* only now, the chip's are known */
 809        card->id.freq = card->pdat->freq;
 810
 811        ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group);
 812        if (ret < 0) {
 813                dev_alert(&card->pdev->dev, "sysfs failed\n");
 814                goto sysfs_failed;
 815        }
 816
 817        for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 818                card->net[j] = netdev =
 819                        softing_netdev_create(card, card->id.chip[j]);
 820                if (!netdev) {
 821                        dev_alert(&pdev->dev, "failed to make can[%i]", j);
 822                        ret = -ENOMEM;
 823                        goto netdev_failed;
 824                }
 825                netdev->dev_id = j;
 826                priv = netdev_priv(card->net[j]);
 827                priv->index = j;
 828                ret = softing_netdev_register(netdev);
 829                if (ret) {
 830                        free_candev(netdev);
 831                        card->net[j] = NULL;
 832                        dev_alert(&card->pdev->dev,
 833                                        "failed to register can[%i]\n", j);
 834                        goto netdev_failed;
 835                }
 836        }
 837        dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name);
 838        return 0;
 839
 840netdev_failed:
 841        for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 842                if (!card->net[j])
 843                        continue;
 844                softing_netdev_cleanup(card->net[j]);
 845        }
 846        sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
 847sysfs_failed:
 848        softing_card_shutdown(card);
 849boot_failed:
 850        iounmap(card->dpram);
 851ioremap_failed:
 852platform_resource_failed:
 853        kfree(card);
 854        return ret;
 855}
 856
 857static struct platform_driver softing_driver = {
 858        .driver = {
 859                .name = "softing",
 860        },
 861        .probe = softing_pdev_probe,
 862        .remove = softing_pdev_remove,
 863};
 864
 865module_platform_driver(softing_driver);
 866
 867MODULE_ALIAS("platform:softing");
 868MODULE_DESCRIPTION("Softing DPRAM CAN driver");
 869MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>");
 870MODULE_LICENSE("GPL v2");
 871
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.