Back to home page

OSCL-LXR
 
 

     

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (C) 2008-2010
0004  *
0005  * - Kurt Van Dijck, EIA Electronics
0006  */
0007 
0008 #include <linux/ethtool.h>
0009 #include <linux/module.h>
0010 #include <linux/interrupt.h>
0011 #include <asm/io.h>
0012 
0013 #include "softing.h"
0014 
0015 #define TX_ECHO_SKB_MAX (((TXMAX+1)/2)-1)
0016 
0017 /*
0018  * test is a specific CAN netdev
0019  * is online (ie. up 'n running, not sleeping, not busoff
0020  */
0021 static inline int canif_is_active(struct net_device *netdev)
0022 {
0023     struct can_priv *can = netdev_priv(netdev);
0024 
0025     if (!netif_running(netdev))
0026         return 0;
0027     return (can->state <= CAN_STATE_ERROR_PASSIVE);
0028 }
0029 
0030 /* reset DPRAM */
0031 static inline void softing_set_reset_dpram(struct softing *card)
0032 {
0033     if (card->pdat->generation >= 2) {
0034         spin_lock_bh(&card->spin);
0035         iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) & ~1,
0036                 &card->dpram[DPRAM_V2_RESET]);
0037         spin_unlock_bh(&card->spin);
0038     }
0039 }
0040 
0041 static inline void softing_clr_reset_dpram(struct softing *card)
0042 {
0043     if (card->pdat->generation >= 2) {
0044         spin_lock_bh(&card->spin);
0045         iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) | 1,
0046                 &card->dpram[DPRAM_V2_RESET]);
0047         spin_unlock_bh(&card->spin);
0048     }
0049 }
0050 
0051 /* trigger the tx queue-ing */
0052 static netdev_tx_t softing_netdev_start_xmit(struct sk_buff *skb,
0053         struct net_device *dev)
0054 {
0055     struct softing_priv *priv = netdev_priv(dev);
0056     struct softing *card = priv->card;
0057     int ret;
0058     uint8_t *ptr;
0059     uint8_t fifo_wr, fifo_rd;
0060     struct can_frame *cf = (struct can_frame *)skb->data;
0061     uint8_t buf[DPRAM_TX_SIZE];
0062 
0063     if (can_dropped_invalid_skb(dev, skb))
0064         return NETDEV_TX_OK;
0065 
0066     spin_lock(&card->spin);
0067 
0068     ret = NETDEV_TX_BUSY;
0069     if (!card->fw.up ||
0070             (card->tx.pending >= TXMAX) ||
0071             (priv->tx.pending >= TX_ECHO_SKB_MAX))
0072         goto xmit_done;
0073     fifo_wr = ioread8(&card->dpram[DPRAM_TX_WR]);
0074     fifo_rd = ioread8(&card->dpram[DPRAM_TX_RD]);
0075     if (fifo_wr == fifo_rd)
0076         /* fifo full */
0077         goto xmit_done;
0078     memset(buf, 0, sizeof(buf));
0079     ptr = buf;
0080     *ptr = CMD_TX;
0081     if (cf->can_id & CAN_RTR_FLAG)
0082         *ptr |= CMD_RTR;
0083     if (cf->can_id & CAN_EFF_FLAG)
0084         *ptr |= CMD_XTD;
0085     if (priv->index)
0086         *ptr |= CMD_BUS2;
0087     ++ptr;
0088     *ptr++ = cf->len;
0089     *ptr++ = (cf->can_id >> 0);
0090     *ptr++ = (cf->can_id >> 8);
0091     if (cf->can_id & CAN_EFF_FLAG) {
0092         *ptr++ = (cf->can_id >> 16);
0093         *ptr++ = (cf->can_id >> 24);
0094     } else {
0095         /* increment 1, not 2 as you might think */
0096         ptr += 1;
0097     }
0098     if (!(cf->can_id & CAN_RTR_FLAG))
0099         memcpy(ptr, &cf->data[0], cf->len);
0100     memcpy_toio(&card->dpram[DPRAM_TX + DPRAM_TX_SIZE * fifo_wr],
0101             buf, DPRAM_TX_SIZE);
0102     if (++fifo_wr >= DPRAM_TX_CNT)
0103         fifo_wr = 0;
0104     iowrite8(fifo_wr, &card->dpram[DPRAM_TX_WR]);
0105     card->tx.last_bus = priv->index;
0106     ++card->tx.pending;
0107     ++priv->tx.pending;
0108     can_put_echo_skb(skb, dev, priv->tx.echo_put, 0);
0109     ++priv->tx.echo_put;
0110     if (priv->tx.echo_put >= TX_ECHO_SKB_MAX)
0111         priv->tx.echo_put = 0;
0112     /* can_put_echo_skb() saves the skb, safe to return TX_OK */
0113     ret = NETDEV_TX_OK;
0114 xmit_done:
0115     spin_unlock(&card->spin);
0116     if (card->tx.pending >= TXMAX) {
0117         int j;
0118         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
0119             if (card->net[j])
0120                 netif_stop_queue(card->net[j]);
0121         }
0122     }
0123     if (ret != NETDEV_TX_OK)
0124         netif_stop_queue(dev);
0125 
0126     return ret;
0127 }
0128 
0129 /*
0130  * shortcut for skb delivery
0131  */
0132 int softing_netdev_rx(struct net_device *netdev, const struct can_frame *msg,
0133         ktime_t ktime)
0134 {
0135     struct sk_buff *skb;
0136     struct can_frame *cf;
0137 
0138     skb = alloc_can_skb(netdev, &cf);
0139     if (!skb)
0140         return -ENOMEM;
0141     memcpy(cf, msg, sizeof(*msg));
0142     skb->tstamp = ktime;
0143     return netif_rx(skb);
0144 }
0145 
0146 /*
0147  * softing_handle_1
0148  * pop 1 entry from the DPRAM queue, and process
0149  */
0150 static int softing_handle_1(struct softing *card)
0151 {
0152     struct net_device *netdev;
0153     struct softing_priv *priv;
0154     ktime_t ktime;
0155     struct can_frame msg;
0156     int cnt = 0, lost_msg;
0157     uint8_t fifo_rd, fifo_wr, cmd;
0158     uint8_t *ptr;
0159     uint32_t tmp_u32;
0160     uint8_t buf[DPRAM_RX_SIZE];
0161 
0162     memset(&msg, 0, sizeof(msg));
0163     /* test for lost msgs */
0164     lost_msg = ioread8(&card->dpram[DPRAM_RX_LOST]);
0165     if (lost_msg) {
0166         int j;
0167         /* reset condition */
0168         iowrite8(0, &card->dpram[DPRAM_RX_LOST]);
0169         /* prepare msg */
0170         msg.can_id = CAN_ERR_FLAG | CAN_ERR_CRTL;
0171         msg.len = CAN_ERR_DLC;
0172         msg.data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
0173         /*
0174          * service to all buses, we don't know which it was applicable
0175          * but only service buses that are online
0176          */
0177         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
0178             netdev = card->net[j];
0179             if (!netdev)
0180                 continue;
0181             if (!canif_is_active(netdev))
0182                 /* a dead bus has no overflows */
0183                 continue;
0184             ++netdev->stats.rx_over_errors;
0185             softing_netdev_rx(netdev, &msg, 0);
0186         }
0187         /* prepare for other use */
0188         memset(&msg, 0, sizeof(msg));
0189         ++cnt;
0190     }
0191 
0192     fifo_rd = ioread8(&card->dpram[DPRAM_RX_RD]);
0193     fifo_wr = ioread8(&card->dpram[DPRAM_RX_WR]);
0194 
0195     if (++fifo_rd >= DPRAM_RX_CNT)
0196         fifo_rd = 0;
0197     if (fifo_wr == fifo_rd)
0198         return cnt;
0199 
0200     memcpy_fromio(buf, &card->dpram[DPRAM_RX + DPRAM_RX_SIZE*fifo_rd],
0201             DPRAM_RX_SIZE);
0202     mb();
0203     /* trigger dual port RAM */
0204     iowrite8(fifo_rd, &card->dpram[DPRAM_RX_RD]);
0205 
0206     ptr = buf;
0207     cmd = *ptr++;
0208     if (cmd == 0xff)
0209         /* not quite useful, probably the card has got out */
0210         return 0;
0211     netdev = card->net[0];
0212     if (cmd & CMD_BUS2)
0213         netdev = card->net[1];
0214     priv = netdev_priv(netdev);
0215 
0216     if (cmd & CMD_ERR) {
0217         uint8_t can_state, state;
0218 
0219         state = *ptr++;
0220 
0221         msg.can_id = CAN_ERR_FLAG;
0222         msg.len = CAN_ERR_DLC;
0223 
0224         if (state & SF_MASK_BUSOFF) {
0225             can_state = CAN_STATE_BUS_OFF;
0226             msg.can_id |= CAN_ERR_BUSOFF;
0227             state = STATE_BUSOFF;
0228         } else if (state & SF_MASK_EPASSIVE) {
0229             can_state = CAN_STATE_ERROR_PASSIVE;
0230             msg.can_id |= CAN_ERR_CRTL;
0231             msg.data[1] = CAN_ERR_CRTL_TX_PASSIVE;
0232             state = STATE_EPASSIVE;
0233         } else {
0234             can_state = CAN_STATE_ERROR_ACTIVE;
0235             msg.can_id |= CAN_ERR_CRTL;
0236             state = STATE_EACTIVE;
0237         }
0238         /* update DPRAM */
0239         iowrite8(state, &card->dpram[priv->index ?
0240                 DPRAM_INFO_BUSSTATE2 : DPRAM_INFO_BUSSTATE]);
0241         /* timestamp */
0242         tmp_u32 = le32_to_cpup((void *)ptr);
0243         ktime = softing_raw2ktime(card, tmp_u32);
0244 
0245         ++netdev->stats.rx_errors;
0246         /* update internal status */
0247         if (can_state != priv->can.state) {
0248             priv->can.state = can_state;
0249             if (can_state == CAN_STATE_ERROR_PASSIVE)
0250                 ++priv->can.can_stats.error_passive;
0251             else if (can_state == CAN_STATE_BUS_OFF) {
0252                 /* this calls can_close_cleanup() */
0253                 ++priv->can.can_stats.bus_off;
0254                 can_bus_off(netdev);
0255                 netif_stop_queue(netdev);
0256             }
0257             /* trigger socketcan */
0258             softing_netdev_rx(netdev, &msg, ktime);
0259         }
0260 
0261     } else {
0262         if (cmd & CMD_RTR)
0263             msg.can_id |= CAN_RTR_FLAG;
0264         msg.len = can_cc_dlc2len(*ptr++);
0265         if (cmd & CMD_XTD) {
0266             msg.can_id |= CAN_EFF_FLAG;
0267             msg.can_id |= le32_to_cpup((void *)ptr);
0268             ptr += 4;
0269         } else {
0270             msg.can_id |= le16_to_cpup((void *)ptr);
0271             ptr += 2;
0272         }
0273         /* timestamp */
0274         tmp_u32 = le32_to_cpup((void *)ptr);
0275         ptr += 4;
0276         ktime = softing_raw2ktime(card, tmp_u32);
0277         if (!(msg.can_id & CAN_RTR_FLAG))
0278             memcpy(&msg.data[0], ptr, 8);
0279         /* update socket */
0280         if (cmd & CMD_ACK) {
0281             /* acknowledge, was tx msg */
0282             struct sk_buff *skb;
0283             skb = priv->can.echo_skb[priv->tx.echo_get];
0284             if (skb)
0285                 skb->tstamp = ktime;
0286             ++netdev->stats.tx_packets;
0287             netdev->stats.tx_bytes +=
0288                 can_get_echo_skb(netdev, priv->tx.echo_get,
0289                          NULL);
0290             ++priv->tx.echo_get;
0291             if (priv->tx.echo_get >= TX_ECHO_SKB_MAX)
0292                 priv->tx.echo_get = 0;
0293             if (priv->tx.pending)
0294                 --priv->tx.pending;
0295             if (card->tx.pending)
0296                 --card->tx.pending;
0297         } else {
0298             int ret;
0299 
0300             ret = softing_netdev_rx(netdev, &msg, ktime);
0301             if (ret == NET_RX_SUCCESS) {
0302                 ++netdev->stats.rx_packets;
0303                 if (!(msg.can_id & CAN_RTR_FLAG))
0304                     netdev->stats.rx_bytes += msg.len;
0305             } else {
0306                 ++netdev->stats.rx_dropped;
0307             }
0308         }
0309     }
0310     ++cnt;
0311     return cnt;
0312 }
0313 
0314 /*
0315  * real interrupt handler
0316  */
0317 static irqreturn_t softing_irq_thread(int irq, void *dev_id)
0318 {
0319     struct softing *card = (struct softing *)dev_id;
0320     struct net_device *netdev;
0321     struct softing_priv *priv;
0322     int j, offset, work_done;
0323 
0324     work_done = 0;
0325     spin_lock_bh(&card->spin);
0326     while (softing_handle_1(card) > 0) {
0327         ++card->irq.svc_count;
0328         ++work_done;
0329     }
0330     spin_unlock_bh(&card->spin);
0331     /* resume tx queue's */
0332     offset = card->tx.last_bus;
0333     for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
0334         if (card->tx.pending >= TXMAX)
0335             break;
0336         netdev = card->net[(j + offset + 1) % card->pdat->nbus];
0337         if (!netdev)
0338             continue;
0339         priv = netdev_priv(netdev);
0340         if (!canif_is_active(netdev))
0341             /* it makes no sense to wake dead buses */
0342             continue;
0343         if (priv->tx.pending >= TX_ECHO_SKB_MAX)
0344             continue;
0345         ++work_done;
0346         netif_wake_queue(netdev);
0347     }
0348     return work_done ? IRQ_HANDLED : IRQ_NONE;
0349 }
0350 
0351 /*
0352  * interrupt routines:
0353  * schedule the 'real interrupt handler'
0354  */
0355 static irqreturn_t softing_irq_v2(int irq, void *dev_id)
0356 {
0357     struct softing *card = (struct softing *)dev_id;
0358     uint8_t ir;
0359 
0360     ir = ioread8(&card->dpram[DPRAM_V2_IRQ_TOHOST]);
0361     iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]);
0362     return (1 == ir) ? IRQ_WAKE_THREAD : IRQ_NONE;
0363 }
0364 
0365 static irqreturn_t softing_irq_v1(int irq, void *dev_id)
0366 {
0367     struct softing *card = (struct softing *)dev_id;
0368     uint8_t ir;
0369 
0370     ir = ioread8(&card->dpram[DPRAM_IRQ_TOHOST]);
0371     iowrite8(0, &card->dpram[DPRAM_IRQ_TOHOST]);
0372     return ir ? IRQ_WAKE_THREAD : IRQ_NONE;
0373 }
0374 
0375 /*
0376  * netdev/candev interoperability
0377  */
0378 static int softing_netdev_open(struct net_device *ndev)
0379 {
0380     int ret;
0381 
0382     /* check or determine and set bittime */
0383     ret = open_candev(ndev);
0384     if (ret)
0385         return ret;
0386 
0387     ret = softing_startstop(ndev, 1);
0388     if (ret < 0)
0389         close_candev(ndev);
0390 
0391     return ret;
0392 }
0393 
0394 static int softing_netdev_stop(struct net_device *ndev)
0395 {
0396     netif_stop_queue(ndev);
0397 
0398     /* softing cycle does close_candev() */
0399     return softing_startstop(ndev, 0);
0400 }
0401 
0402 static int softing_candev_set_mode(struct net_device *ndev, enum can_mode mode)
0403 {
0404     int ret;
0405 
0406     switch (mode) {
0407     case CAN_MODE_START:
0408         /* softing_startstop does close_candev() */
0409         ret = softing_startstop(ndev, 1);
0410         return ret;
0411     case CAN_MODE_STOP:
0412     case CAN_MODE_SLEEP:
0413         return -EOPNOTSUPP;
0414     }
0415     return 0;
0416 }
0417 
0418 /*
0419  * Softing device management helpers
0420  */
0421 int softing_enable_irq(struct softing *card, int enable)
0422 {
0423     int ret;
0424 
0425     if (!card->irq.nr) {
0426         return 0;
0427     } else if (card->irq.requested && !enable) {
0428         free_irq(card->irq.nr, card);
0429         card->irq.requested = 0;
0430     } else if (!card->irq.requested && enable) {
0431         ret = request_threaded_irq(card->irq.nr,
0432                 (card->pdat->generation >= 2) ?
0433                     softing_irq_v2 : softing_irq_v1,
0434                 softing_irq_thread, IRQF_SHARED,
0435                 dev_name(&card->pdev->dev), card);
0436         if (ret) {
0437             dev_alert(&card->pdev->dev,
0438                     "request_threaded_irq(%u) failed\n",
0439                     card->irq.nr);
0440             return ret;
0441         }
0442         card->irq.requested = 1;
0443     }
0444     return 0;
0445 }
0446 
0447 static void softing_card_shutdown(struct softing *card)
0448 {
0449     int fw_up = 0;
0450 
0451     if (mutex_lock_interruptible(&card->fw.lock)) {
0452         /* return -ERESTARTSYS */;
0453     }
0454     fw_up = card->fw.up;
0455     card->fw.up = 0;
0456 
0457     if (card->irq.requested && card->irq.nr) {
0458         free_irq(card->irq.nr, card);
0459         card->irq.requested = 0;
0460     }
0461     if (fw_up) {
0462         if (card->pdat->enable_irq)
0463             card->pdat->enable_irq(card->pdev, 0);
0464         softing_set_reset_dpram(card);
0465         if (card->pdat->reset)
0466             card->pdat->reset(card->pdev, 1);
0467     }
0468     mutex_unlock(&card->fw.lock);
0469 }
0470 
0471 static int softing_card_boot(struct softing *card)
0472 {
0473     int ret, j;
0474     static const uint8_t stream[] = {
0475         0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, };
0476     unsigned char back[sizeof(stream)];
0477 
0478     if (mutex_lock_interruptible(&card->fw.lock))
0479         return -ERESTARTSYS;
0480     if (card->fw.up) {
0481         mutex_unlock(&card->fw.lock);
0482         return 0;
0483     }
0484     /* reset board */
0485     if (card->pdat->enable_irq)
0486         card->pdat->enable_irq(card->pdev, 1);
0487     /* boot card */
0488     softing_set_reset_dpram(card);
0489     if (card->pdat->reset)
0490         card->pdat->reset(card->pdev, 1);
0491     for (j = 0; (j + sizeof(stream)) < card->dpram_size;
0492             j += sizeof(stream)) {
0493 
0494         memcpy_toio(&card->dpram[j], stream, sizeof(stream));
0495         /* flush IO cache */
0496         mb();
0497         memcpy_fromio(back, &card->dpram[j], sizeof(stream));
0498 
0499         if (!memcmp(back, stream, sizeof(stream)))
0500             continue;
0501         /* memory is not equal */
0502         dev_alert(&card->pdev->dev, "dpram failed at 0x%04x\n", j);
0503         ret = -EIO;
0504         goto failed;
0505     }
0506     wmb();
0507     /* load boot firmware */
0508     ret = softing_load_fw(card->pdat->boot.fw, card, card->dpram,
0509                 card->dpram_size,
0510                 card->pdat->boot.offs - card->pdat->boot.addr);
0511     if (ret < 0)
0512         goto failed;
0513     /* load loader firmware */
0514     ret = softing_load_fw(card->pdat->load.fw, card, card->dpram,
0515                 card->dpram_size,
0516                 card->pdat->load.offs - card->pdat->load.addr);
0517     if (ret < 0)
0518         goto failed;
0519 
0520     if (card->pdat->reset)
0521         card->pdat->reset(card->pdev, 0);
0522     softing_clr_reset_dpram(card);
0523     ret = softing_bootloader_command(card, 0, "card boot");
0524     if (ret < 0)
0525         goto failed;
0526     ret = softing_load_app_fw(card->pdat->app.fw, card);
0527     if (ret < 0)
0528         goto failed;
0529 
0530     ret = softing_chip_poweron(card);
0531     if (ret < 0)
0532         goto failed;
0533 
0534     card->fw.up = 1;
0535     mutex_unlock(&card->fw.lock);
0536     return 0;
0537 failed:
0538     card->fw.up = 0;
0539     if (card->pdat->enable_irq)
0540         card->pdat->enable_irq(card->pdev, 0);
0541     softing_set_reset_dpram(card);
0542     if (card->pdat->reset)
0543         card->pdat->reset(card->pdev, 1);
0544     mutex_unlock(&card->fw.lock);
0545     return ret;
0546 }
0547 
0548 /*
0549  * netdev sysfs
0550  */
0551 static ssize_t show_chip(struct device *dev, struct device_attribute *attr,
0552         char *buf)
0553 {
0554     struct net_device *ndev = to_net_dev(dev);
0555     struct softing_priv *priv = netdev2softing(ndev);
0556 
0557     return sprintf(buf, "%i\n", priv->chip);
0558 }
0559 
0560 static ssize_t show_output(struct device *dev, struct device_attribute *attr,
0561         char *buf)
0562 {
0563     struct net_device *ndev = to_net_dev(dev);
0564     struct softing_priv *priv = netdev2softing(ndev);
0565 
0566     return sprintf(buf, "0x%02x\n", priv->output);
0567 }
0568 
0569 static ssize_t store_output(struct device *dev, struct device_attribute *attr,
0570         const char *buf, size_t count)
0571 {
0572     struct net_device *ndev = to_net_dev(dev);
0573     struct softing_priv *priv = netdev2softing(ndev);
0574     struct softing *card = priv->card;
0575     unsigned long val;
0576     int ret;
0577 
0578     ret = kstrtoul(buf, 0, &val);
0579     if (ret < 0)
0580         return ret;
0581     val &= 0xFF;
0582 
0583     ret = mutex_lock_interruptible(&card->fw.lock);
0584     if (ret)
0585         return -ERESTARTSYS;
0586     if (netif_running(ndev)) {
0587         mutex_unlock(&card->fw.lock);
0588         return -EBUSY;
0589     }
0590     priv->output = val;
0591     mutex_unlock(&card->fw.lock);
0592     return count;
0593 }
0594 
0595 static const DEVICE_ATTR(chip, 0444, show_chip, NULL);
0596 static const DEVICE_ATTR(output, 0644, show_output, store_output);
0597 
0598 static const struct attribute *const netdev_sysfs_attrs[] = {
0599     &dev_attr_chip.attr,
0600     &dev_attr_output.attr,
0601     NULL,
0602 };
0603 static const struct attribute_group netdev_sysfs_group = {
0604     .name = NULL,
0605     .attrs = (struct attribute **)netdev_sysfs_attrs,
0606 };
0607 
0608 static const struct net_device_ops softing_netdev_ops = {
0609     .ndo_open = softing_netdev_open,
0610     .ndo_stop = softing_netdev_stop,
0611     .ndo_start_xmit = softing_netdev_start_xmit,
0612     .ndo_change_mtu = can_change_mtu,
0613 };
0614 
0615 static const struct ethtool_ops softing_ethtool_ops = {
0616     .get_ts_info = ethtool_op_get_ts_info,
0617 };
0618 
0619 static const struct can_bittiming_const softing_btr_const = {
0620     .name = KBUILD_MODNAME,
0621     .tseg1_min = 1,
0622     .tseg1_max = 16,
0623     .tseg2_min = 1,
0624     .tseg2_max = 8,
0625     .sjw_max = 4, /* overruled */
0626     .brp_min = 1,
0627     .brp_max = 32, /* overruled */
0628     .brp_inc = 1,
0629 };
0630 
0631 
0632 static struct net_device *softing_netdev_create(struct softing *card,
0633                         uint16_t chip_id)
0634 {
0635     struct net_device *netdev;
0636     struct softing_priv *priv;
0637 
0638     netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX);
0639     if (!netdev) {
0640         dev_alert(&card->pdev->dev, "alloc_candev failed\n");
0641         return NULL;
0642     }
0643     priv = netdev_priv(netdev);
0644     priv->netdev = netdev;
0645     priv->card = card;
0646     memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const));
0647     priv->btr_const.brp_max = card->pdat->max_brp;
0648     priv->btr_const.sjw_max = card->pdat->max_sjw;
0649     priv->can.bittiming_const = &priv->btr_const;
0650     priv->can.clock.freq = 8000000;
0651     priv->chip = chip_id;
0652     priv->output = softing_default_output(netdev);
0653     SET_NETDEV_DEV(netdev, &card->pdev->dev);
0654 
0655     netdev->flags |= IFF_ECHO;
0656     netdev->netdev_ops = &softing_netdev_ops;
0657     netdev->ethtool_ops = &softing_ethtool_ops;
0658     priv->can.do_set_mode = softing_candev_set_mode;
0659     priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
0660 
0661     return netdev;
0662 }
0663 
0664 static int softing_netdev_register(struct net_device *netdev)
0665 {
0666     int ret;
0667 
0668     ret = register_candev(netdev);
0669     if (ret) {
0670         dev_alert(&netdev->dev, "register failed\n");
0671         return ret;
0672     }
0673     if (sysfs_create_group(&netdev->dev.kobj, &netdev_sysfs_group) < 0)
0674         netdev_alert(netdev, "sysfs group failed\n");
0675 
0676     return 0;
0677 }
0678 
0679 static void softing_netdev_cleanup(struct net_device *netdev)
0680 {
0681     sysfs_remove_group(&netdev->dev.kobj, &netdev_sysfs_group);
0682     unregister_candev(netdev);
0683     free_candev(netdev);
0684 }
0685 
0686 /*
0687  * sysfs for Platform device
0688  */
0689 #define DEV_ATTR_RO(name, member) \
0690 static ssize_t show_##name(struct device *dev, \
0691         struct device_attribute *attr, char *buf) \
0692 { \
0693     struct softing *card = dev_get_drvdata(dev); \
0694     return sprintf(buf, "%u\n", card->member); \
0695 } \
0696 static DEVICE_ATTR(name, 0444, show_##name, NULL)
0697 
0698 #define DEV_ATTR_RO_STR(name, member) \
0699 static ssize_t show_##name(struct device *dev, \
0700         struct device_attribute *attr, char *buf) \
0701 { \
0702     struct softing *card = dev_get_drvdata(dev); \
0703     return sprintf(buf, "%s\n", card->member); \
0704 } \
0705 static DEVICE_ATTR(name, 0444, show_##name, NULL)
0706 
0707 DEV_ATTR_RO(serial, id.serial);
0708 DEV_ATTR_RO_STR(firmware, pdat->app.fw);
0709 DEV_ATTR_RO(firmware_version, id.fw_version);
0710 DEV_ATTR_RO_STR(hardware, pdat->name);
0711 DEV_ATTR_RO(hardware_version, id.hw_version);
0712 DEV_ATTR_RO(license, id.license);
0713 
0714 static struct attribute *softing_pdev_attrs[] = {
0715     &dev_attr_serial.attr,
0716     &dev_attr_firmware.attr,
0717     &dev_attr_firmware_version.attr,
0718     &dev_attr_hardware.attr,
0719     &dev_attr_hardware_version.attr,
0720     &dev_attr_license.attr,
0721     NULL,
0722 };
0723 
0724 static const struct attribute_group softing_pdev_group = {
0725     .name = NULL,
0726     .attrs = softing_pdev_attrs,
0727 };
0728 
0729 /*
0730  * platform driver
0731  */
0732 static int softing_pdev_remove(struct platform_device *pdev)
0733 {
0734     struct softing *card = platform_get_drvdata(pdev);
0735     int j;
0736 
0737     /* first, disable card*/
0738     softing_card_shutdown(card);
0739 
0740     for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
0741         if (!card->net[j])
0742             continue;
0743         softing_netdev_cleanup(card->net[j]);
0744         card->net[j] = NULL;
0745     }
0746     sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
0747 
0748     iounmap(card->dpram);
0749     kfree(card);
0750     return 0;
0751 }
0752 
0753 static int softing_pdev_probe(struct platform_device *pdev)
0754 {
0755     const struct softing_platform_data *pdat = dev_get_platdata(&pdev->dev);
0756     struct softing *card;
0757     struct net_device *netdev;
0758     struct softing_priv *priv;
0759     struct resource *pres;
0760     int ret;
0761     int j;
0762 
0763     if (!pdat) {
0764         dev_warn(&pdev->dev, "no platform data\n");
0765         return -EINVAL;
0766     }
0767     if (pdat->nbus > ARRAY_SIZE(card->net)) {
0768         dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus);
0769         return -EINVAL;
0770     }
0771 
0772     card = kzalloc(sizeof(*card), GFP_KERNEL);
0773     if (!card)
0774         return -ENOMEM;
0775     card->pdat = pdat;
0776     card->pdev = pdev;
0777     platform_set_drvdata(pdev, card);
0778     mutex_init(&card->fw.lock);
0779     spin_lock_init(&card->spin);
0780 
0781     ret = -EINVAL;
0782     pres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
0783     if (!pres)
0784         goto platform_resource_failed;
0785     card->dpram_phys = pres->start;
0786     card->dpram_size = resource_size(pres);
0787     card->dpram = ioremap(card->dpram_phys, card->dpram_size);
0788     if (!card->dpram) {
0789         dev_alert(&card->pdev->dev, "dpram ioremap failed\n");
0790         goto ioremap_failed;
0791     }
0792 
0793     pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
0794     if (pres)
0795         card->irq.nr = pres->start;
0796 
0797     /* reset card */
0798     ret = softing_card_boot(card);
0799     if (ret < 0) {
0800         dev_alert(&pdev->dev, "failed to boot\n");
0801         goto boot_failed;
0802     }
0803 
0804     /* only now, the chip's are known */
0805     card->id.freq = card->pdat->freq;
0806 
0807     ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group);
0808     if (ret < 0) {
0809         dev_alert(&card->pdev->dev, "sysfs failed\n");
0810         goto sysfs_failed;
0811     }
0812 
0813     for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
0814         card->net[j] = netdev =
0815             softing_netdev_create(card, card->id.chip[j]);
0816         if (!netdev) {
0817             dev_alert(&pdev->dev, "failed to make can[%i]", j);
0818             ret = -ENOMEM;
0819             goto netdev_failed;
0820         }
0821         netdev->dev_id = j;
0822         priv = netdev_priv(card->net[j]);
0823         priv->index = j;
0824         ret = softing_netdev_register(netdev);
0825         if (ret) {
0826             free_candev(netdev);
0827             card->net[j] = NULL;
0828             dev_alert(&card->pdev->dev,
0829                     "failed to register can[%i]\n", j);
0830             goto netdev_failed;
0831         }
0832     }
0833     dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name);
0834     return 0;
0835 
0836 netdev_failed:
0837     for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
0838         if (!card->net[j])
0839             continue;
0840         softing_netdev_cleanup(card->net[j]);
0841     }
0842     sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
0843 sysfs_failed:
0844     softing_card_shutdown(card);
0845 boot_failed:
0846     iounmap(card->dpram);
0847 ioremap_failed:
0848 platform_resource_failed:
0849     kfree(card);
0850     return ret;
0851 }
0852 
0853 static struct platform_driver softing_driver = {
0854     .driver = {
0855         .name = KBUILD_MODNAME,
0856     },
0857     .probe = softing_pdev_probe,
0858     .remove = softing_pdev_remove,
0859 };
0860 
0861 module_platform_driver(softing_driver);
0862 
0863 MODULE_ALIAS("platform:softing");
0864 MODULE_DESCRIPTION("Softing DPRAM CAN driver");
0865 MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>");
0866 MODULE_LICENSE("GPL v2");
[ Source navigation ] [ Diff markup ] [ Identifier search ] [ general search ]

This page was automatically generated by the 2.1.0 LXR engine.

The LXR team
Valid CSS 2.1! Valid HTML 4.01!