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OpenCloudOS-Kernel/drivers/net/can/softing/softing_main.c

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/*
* Copyright (C) 2008-2010
*
* - Kurt Van Dijck, EIA Electronics
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the version 2 of the GNU General Public License
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#include "softing.h"
#define TX_ECHO_SKB_MAX (((TXMAX+1)/2)-1)
/*
* test is a specific CAN netdev
* is online (ie. up 'n running, not sleeping, not busoff
*/
static inline int canif_is_active(struct net_device *netdev)
{
struct can_priv *can = netdev_priv(netdev);
if (!netif_running(netdev))
return 0;
return (can->state <= CAN_STATE_ERROR_PASSIVE);
}
/* reset DPRAM */
static inline void softing_set_reset_dpram(struct softing *card)
{
if (card->pdat->generation >= 2) {
spin_lock_bh(&card->spin);
iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) & ~1,
&card->dpram[DPRAM_V2_RESET]);
spin_unlock_bh(&card->spin);
}
}
static inline void softing_clr_reset_dpram(struct softing *card)
{
if (card->pdat->generation >= 2) {
spin_lock_bh(&card->spin);
iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) | 1,
&card->dpram[DPRAM_V2_RESET]);
spin_unlock_bh(&card->spin);
}
}
/* trigger the tx queue-ing */
static netdev_tx_t softing_netdev_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct softing_priv *priv = netdev_priv(dev);
struct softing *card = priv->card;
int ret;
uint8_t *ptr;
uint8_t fifo_wr, fifo_rd;
struct can_frame *cf = (struct can_frame *)skb->data;
uint8_t buf[DPRAM_TX_SIZE];
if (can_dropped_invalid_skb(dev, skb))
return NETDEV_TX_OK;
spin_lock(&card->spin);
ret = NETDEV_TX_BUSY;
if (!card->fw.up ||
(card->tx.pending >= TXMAX) ||
(priv->tx.pending >= TX_ECHO_SKB_MAX))
goto xmit_done;
fifo_wr = ioread8(&card->dpram[DPRAM_TX_WR]);
fifo_rd = ioread8(&card->dpram[DPRAM_TX_RD]);
if (fifo_wr == fifo_rd)
/* fifo full */
goto xmit_done;
memset(buf, 0, sizeof(buf));
ptr = buf;
*ptr = CMD_TX;
if (cf->can_id & CAN_RTR_FLAG)
*ptr |= CMD_RTR;
if (cf->can_id & CAN_EFF_FLAG)
*ptr |= CMD_XTD;
if (priv->index)
*ptr |= CMD_BUS2;
++ptr;
*ptr++ = cf->can_dlc;
*ptr++ = (cf->can_id >> 0);
*ptr++ = (cf->can_id >> 8);
if (cf->can_id & CAN_EFF_FLAG) {
*ptr++ = (cf->can_id >> 16);
*ptr++ = (cf->can_id >> 24);
} else {
/* increment 1, not 2 as you might think */
ptr += 1;
}
if (!(cf->can_id & CAN_RTR_FLAG))
memcpy(ptr, &cf->data[0], cf->can_dlc);
memcpy_toio(&card->dpram[DPRAM_TX + DPRAM_TX_SIZE * fifo_wr],
buf, DPRAM_TX_SIZE);
if (++fifo_wr >= DPRAM_TX_CNT)
fifo_wr = 0;
iowrite8(fifo_wr, &card->dpram[DPRAM_TX_WR]);
card->tx.last_bus = priv->index;
++card->tx.pending;
++priv->tx.pending;
can_put_echo_skb(skb, dev, priv->tx.echo_put);
++priv->tx.echo_put;
if (priv->tx.echo_put >= TX_ECHO_SKB_MAX)
priv->tx.echo_put = 0;
/* can_put_echo_skb() saves the skb, safe to return TX_OK */
ret = NETDEV_TX_OK;
xmit_done:
spin_unlock(&card->spin);
if (card->tx.pending >= TXMAX) {
int j;
for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
if (card->net[j])
netif_stop_queue(card->net[j]);
}
}
if (ret != NETDEV_TX_OK)
netif_stop_queue(dev);
return ret;
}
/*
* shortcut for skb delivery
*/
int softing_netdev_rx(struct net_device *netdev, const struct can_frame *msg,
ktime_t ktime)
{
struct sk_buff *skb;
struct can_frame *cf;
skb = alloc_can_skb(netdev, &cf);
if (!skb)
return -ENOMEM;
memcpy(cf, msg, sizeof(*msg));
skb->tstamp = ktime;
return netif_rx(skb);
}
/*
* softing_handle_1
* pop 1 entry from the DPRAM queue, and process
*/
static int softing_handle_1(struct softing *card)
{
struct net_device *netdev;
struct softing_priv *priv;
ktime_t ktime;
struct can_frame msg;
int cnt = 0, lost_msg;
uint8_t fifo_rd, fifo_wr, cmd;
uint8_t *ptr;
uint32_t tmp_u32;
uint8_t buf[DPRAM_RX_SIZE];
memset(&msg, 0, sizeof(msg));
/* test for lost msgs */
lost_msg = ioread8(&card->dpram[DPRAM_RX_LOST]);
if (lost_msg) {
int j;
/* reset condition */
iowrite8(0, &card->dpram[DPRAM_RX_LOST]);
/* prepare msg */
msg.can_id = CAN_ERR_FLAG | CAN_ERR_CRTL;
msg.can_dlc = CAN_ERR_DLC;
msg.data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
/*
* service to all busses, we don't know which it was applicable
* but only service busses that are online
*/
for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
netdev = card->net[j];
if (!netdev)
continue;
if (!canif_is_active(netdev))
/* a dead bus has no overflows */
continue;
++netdev->stats.rx_over_errors;
softing_netdev_rx(netdev, &msg, ktime_set(0, 0));
}
/* prepare for other use */
memset(&msg, 0, sizeof(msg));
++cnt;
}
fifo_rd = ioread8(&card->dpram[DPRAM_RX_RD]);
fifo_wr = ioread8(&card->dpram[DPRAM_RX_WR]);
if (++fifo_rd >= DPRAM_RX_CNT)
fifo_rd = 0;
if (fifo_wr == fifo_rd)
return cnt;
memcpy_fromio(buf, &card->dpram[DPRAM_RX + DPRAM_RX_SIZE*fifo_rd],
DPRAM_RX_SIZE);
mb();
/* trigger dual port RAM */
iowrite8(fifo_rd, &card->dpram[DPRAM_RX_RD]);
ptr = buf;
cmd = *ptr++;
if (cmd == 0xff)
/* not quite useful, probably the card has got out */
return 0;
netdev = card->net[0];
if (cmd & CMD_BUS2)
netdev = card->net[1];
priv = netdev_priv(netdev);
if (cmd & CMD_ERR) {
uint8_t can_state, state;
state = *ptr++;
msg.can_id = CAN_ERR_FLAG;
msg.can_dlc = CAN_ERR_DLC;
if (state & SF_MASK_BUSOFF) {
can_state = CAN_STATE_BUS_OFF;
msg.can_id |= CAN_ERR_BUSOFF;
state = STATE_BUSOFF;
} else if (state & SF_MASK_EPASSIVE) {
can_state = CAN_STATE_ERROR_PASSIVE;
msg.can_id |= CAN_ERR_CRTL;
msg.data[1] = CAN_ERR_CRTL_TX_PASSIVE;
state = STATE_EPASSIVE;
} else {
can_state = CAN_STATE_ERROR_ACTIVE;
msg.can_id |= CAN_ERR_CRTL;
state = STATE_EACTIVE;
}
/* update DPRAM */
iowrite8(state, &card->dpram[priv->index ?
DPRAM_INFO_BUSSTATE2 : DPRAM_INFO_BUSSTATE]);
/* timestamp */
tmp_u32 = le32_to_cpup((void *)ptr);
ptr += 4;
ktime = softing_raw2ktime(card, tmp_u32);
++netdev->stats.rx_errors;
/* update internal status */
if (can_state != priv->can.state) {
priv->can.state = can_state;
if (can_state == CAN_STATE_ERROR_PASSIVE)
++priv->can.can_stats.error_passive;
else if (can_state == CAN_STATE_BUS_OFF) {
/* this calls can_close_cleanup() */
can_bus_off(netdev);
netif_stop_queue(netdev);
}
/* trigger socketcan */
softing_netdev_rx(netdev, &msg, ktime);
}
} else {
if (cmd & CMD_RTR)
msg.can_id |= CAN_RTR_FLAG;
msg.can_dlc = get_can_dlc(*ptr++);
if (cmd & CMD_XTD) {
msg.can_id |= CAN_EFF_FLAG;
msg.can_id |= le32_to_cpup((void *)ptr);
ptr += 4;
} else {
msg.can_id |= le16_to_cpup((void *)ptr);
ptr += 2;
}
/* timestamp */
tmp_u32 = le32_to_cpup((void *)ptr);
ptr += 4;
ktime = softing_raw2ktime(card, tmp_u32);
if (!(msg.can_id & CAN_RTR_FLAG))
memcpy(&msg.data[0], ptr, 8);
ptr += 8;
/* update socket */
if (cmd & CMD_ACK) {
/* acknowledge, was tx msg */
struct sk_buff *skb;
skb = priv->can.echo_skb[priv->tx.echo_get];
if (skb)
skb->tstamp = ktime;
can_get_echo_skb(netdev, priv->tx.echo_get);
++priv->tx.echo_get;
if (priv->tx.echo_get >= TX_ECHO_SKB_MAX)
priv->tx.echo_get = 0;
if (priv->tx.pending)
--priv->tx.pending;
if (card->tx.pending)
--card->tx.pending;
++netdev->stats.tx_packets;
if (!(msg.can_id & CAN_RTR_FLAG))
netdev->stats.tx_bytes += msg.can_dlc;
} else {
int ret;
ret = softing_netdev_rx(netdev, &msg, ktime);
if (ret == NET_RX_SUCCESS) {
++netdev->stats.rx_packets;
if (!(msg.can_id & CAN_RTR_FLAG))
netdev->stats.rx_bytes += msg.can_dlc;
} else {
++netdev->stats.rx_dropped;
}
}
}
++cnt;
return cnt;
}
/*
* real interrupt handler
*/
static irqreturn_t softing_irq_thread(int irq, void *dev_id)
{
struct softing *card = (struct softing *)dev_id;
struct net_device *netdev;
struct softing_priv *priv;
int j, offset, work_done;
work_done = 0;
spin_lock_bh(&card->spin);
while (softing_handle_1(card) > 0) {
++card->irq.svc_count;
++work_done;
}
spin_unlock_bh(&card->spin);
/* resume tx queue's */
offset = card->tx.last_bus;
for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
if (card->tx.pending >= TXMAX)
break;
netdev = card->net[(j + offset + 1) % card->pdat->nbus];
if (!netdev)
continue;
priv = netdev_priv(netdev);
if (!canif_is_active(netdev))
/* it makes no sense to wake dead busses */
continue;
if (priv->tx.pending >= TX_ECHO_SKB_MAX)
continue;
++work_done;
netif_wake_queue(netdev);
}
return work_done ? IRQ_HANDLED : IRQ_NONE;
}
/*
* interrupt routines:
* schedule the 'real interrupt handler'
*/
static irqreturn_t softing_irq_v2(int irq, void *dev_id)
{
struct softing *card = (struct softing *)dev_id;
uint8_t ir;
ir = ioread8(&card->dpram[DPRAM_V2_IRQ_TOHOST]);
iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]);
return (1 == ir) ? IRQ_WAKE_THREAD : IRQ_NONE;
}
static irqreturn_t softing_irq_v1(int irq, void *dev_id)
{
struct softing *card = (struct softing *)dev_id;
uint8_t ir;
ir = ioread8(&card->dpram[DPRAM_IRQ_TOHOST]);
iowrite8(0, &card->dpram[DPRAM_IRQ_TOHOST]);
return ir ? IRQ_WAKE_THREAD : IRQ_NONE;
}
/*
* netdev/candev inter-operability
*/
static int softing_netdev_open(struct net_device *ndev)
{
int ret;
/* check or determine and set bittime */
ret = open_candev(ndev);
if (!ret)
ret = softing_startstop(ndev, 1);
return ret;
}
static int softing_netdev_stop(struct net_device *ndev)
{
int ret;
netif_stop_queue(ndev);
/* softing cycle does close_candev() */
ret = softing_startstop(ndev, 0);
return ret;
}
static int softing_candev_set_mode(struct net_device *ndev, enum can_mode mode)
{
int ret;
switch (mode) {
case CAN_MODE_START:
/* softing_startstop does close_candev() */
ret = softing_startstop(ndev, 1);
return ret;
case CAN_MODE_STOP:
case CAN_MODE_SLEEP:
return -EOPNOTSUPP;
}
return 0;
}
/*
* Softing device management helpers
*/
int softing_enable_irq(struct softing *card, int enable)
{
int ret;
if (!card->irq.nr) {
return 0;
} else if (card->irq.requested && !enable) {
free_irq(card->irq.nr, card);
card->irq.requested = 0;
} else if (!card->irq.requested && enable) {
ret = request_threaded_irq(card->irq.nr,
(card->pdat->generation >= 2) ?
softing_irq_v2 : softing_irq_v1,
softing_irq_thread, IRQF_SHARED,
dev_name(&card->pdev->dev), card);
if (ret) {
dev_alert(&card->pdev->dev,
"request_threaded_irq(%u) failed\n",
card->irq.nr);
return ret;
}
card->irq.requested = 1;
}
return 0;
}
static void softing_card_shutdown(struct softing *card)
{
int fw_up = 0;
if (mutex_lock_interruptible(&card->fw.lock))
/* return -ERESTARTSYS */;
fw_up = card->fw.up;
card->fw.up = 0;
if (card->irq.requested && card->irq.nr) {
free_irq(card->irq.nr, card);
card->irq.requested = 0;
}
if (fw_up) {
if (card->pdat->enable_irq)
card->pdat->enable_irq(card->pdev, 0);
softing_set_reset_dpram(card);
if (card->pdat->reset)
card->pdat->reset(card->pdev, 1);
}
mutex_unlock(&card->fw.lock);
}
static int softing_card_boot(struct softing *card)
{
int ret, j;
static const uint8_t stream[] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, };
unsigned char back[sizeof(stream)];
if (mutex_lock_interruptible(&card->fw.lock))
return -ERESTARTSYS;
if (card->fw.up) {
mutex_unlock(&card->fw.lock);
return 0;
}
/* reset board */
if (card->pdat->enable_irq)
card->pdat->enable_irq(card->pdev, 1);
/* boot card */
softing_set_reset_dpram(card);
if (card->pdat->reset)
card->pdat->reset(card->pdev, 1);
for (j = 0; (j + sizeof(stream)) < card->dpram_size;
j += sizeof(stream)) {
memcpy_toio(&card->dpram[j], stream, sizeof(stream));
/* flush IO cache */
mb();
memcpy_fromio(back, &card->dpram[j], sizeof(stream));
if (!memcmp(back, stream, sizeof(stream)))
continue;
/* memory is not equal */
dev_alert(&card->pdev->dev, "dpram failed at 0x%04x\n", j);
ret = -EIO;
goto failed;
}
wmb();
/* load boot firmware */
ret = softing_load_fw(card->pdat->boot.fw, card, card->dpram,
card->dpram_size,
card->pdat->boot.offs - card->pdat->boot.addr);
if (ret < 0)
goto failed;
/* load loader firmware */
ret = softing_load_fw(card->pdat->load.fw, card, card->dpram,
card->dpram_size,
card->pdat->load.offs - card->pdat->load.addr);
if (ret < 0)
goto failed;
if (card->pdat->reset)
card->pdat->reset(card->pdev, 0);
softing_clr_reset_dpram(card);
ret = softing_bootloader_command(card, 0, "card boot");
if (ret < 0)
goto failed;
ret = softing_load_app_fw(card->pdat->app.fw, card);
if (ret < 0)
goto failed;
ret = softing_chip_poweron(card);
if (ret < 0)
goto failed;
card->fw.up = 1;
mutex_unlock(&card->fw.lock);
return 0;
failed:
card->fw.up = 0;
if (card->pdat->enable_irq)
card->pdat->enable_irq(card->pdev, 0);
softing_set_reset_dpram(card);
if (card->pdat->reset)
card->pdat->reset(card->pdev, 1);
mutex_unlock(&card->fw.lock);
return ret;
}
/*
* netdev sysfs
*/
static ssize_t show_channel(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct net_device *ndev = to_net_dev(dev);
struct softing_priv *priv = netdev2softing(ndev);
return sprintf(buf, "%i\n", priv->index);
}
static ssize_t show_chip(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct net_device *ndev = to_net_dev(dev);
struct softing_priv *priv = netdev2softing(ndev);
return sprintf(buf, "%i\n", priv->chip);
}
static ssize_t show_output(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct net_device *ndev = to_net_dev(dev);
struct softing_priv *priv = netdev2softing(ndev);
return sprintf(buf, "0x%02x\n", priv->output);
}
static ssize_t store_output(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct net_device *ndev = to_net_dev(dev);
struct softing_priv *priv = netdev2softing(ndev);
struct softing *card = priv->card;
unsigned long val;
int ret;
ret = kstrtoul(buf, 0, &val);
if (ret < 0)
return ret;
val &= 0xFF;
ret = mutex_lock_interruptible(&card->fw.lock);
if (ret)
return -ERESTARTSYS;
if (netif_running(ndev)) {
mutex_unlock(&card->fw.lock);
return -EBUSY;
}
priv->output = val;
mutex_unlock(&card->fw.lock);
return count;
}
static const DEVICE_ATTR(channel, S_IRUGO, show_channel, NULL);
static const DEVICE_ATTR(chip, S_IRUGO, show_chip, NULL);
static const DEVICE_ATTR(output, S_IRUGO | S_IWUSR, show_output, store_output);
static const struct attribute *const netdev_sysfs_attrs[] = {
&dev_attr_channel.attr,
&dev_attr_chip.attr,
&dev_attr_output.attr,
NULL,
};
static const struct attribute_group netdev_sysfs_group = {
.name = NULL,
.attrs = (struct attribute **)netdev_sysfs_attrs,
};
static const struct net_device_ops softing_netdev_ops = {
.ndo_open = softing_netdev_open,
.ndo_stop = softing_netdev_stop,
.ndo_start_xmit = softing_netdev_start_xmit,
.ndo_change_mtu = can_change_mtu,
};
static const struct can_bittiming_const softing_btr_const = {
.name = "softing",
.tseg1_min = 1,
.tseg1_max = 16,
.tseg2_min = 1,
.tseg2_max = 8,
.sjw_max = 4, /* overruled */
.brp_min = 1,
.brp_max = 32, /* overruled */
.brp_inc = 1,
};
static struct net_device *softing_netdev_create(struct softing *card,
uint16_t chip_id)
{
struct net_device *netdev;
struct softing_priv *priv;
netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX);
if (!netdev) {
dev_alert(&card->pdev->dev, "alloc_candev failed\n");
return NULL;
}
priv = netdev_priv(netdev);
priv->netdev = netdev;
priv->card = card;
memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const));
priv->btr_const.brp_max = card->pdat->max_brp;
priv->btr_const.sjw_max = card->pdat->max_sjw;
priv->can.bittiming_const = &priv->btr_const;
priv->can.clock.freq = 8000000;
priv->chip = chip_id;
priv->output = softing_default_output(netdev);
SET_NETDEV_DEV(netdev, &card->pdev->dev);
netdev->flags |= IFF_ECHO;
netdev->netdev_ops = &softing_netdev_ops;
priv->can.do_set_mode = softing_candev_set_mode;
priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
return netdev;
}
static int softing_netdev_register(struct net_device *netdev)
{
int ret;
netdev->sysfs_groups[0] = &netdev_sysfs_group;
ret = register_candev(netdev);
if (ret) {
dev_alert(&netdev->dev, "register failed\n");
return ret;
}
return 0;
}
static void softing_netdev_cleanup(struct net_device *netdev)
{
unregister_candev(netdev);
free_candev(netdev);
}
/*
* sysfs for Platform device
*/
#define DEV_ATTR_RO(name, member) \
static ssize_t show_##name(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct softing *card = platform_get_drvdata(to_platform_device(dev)); \
return sprintf(buf, "%u\n", card->member); \
} \
static DEVICE_ATTR(name, 0444, show_##name, NULL)
#define DEV_ATTR_RO_STR(name, member) \
static ssize_t show_##name(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct softing *card = platform_get_drvdata(to_platform_device(dev)); \
return sprintf(buf, "%s\n", card->member); \
} \
static DEVICE_ATTR(name, 0444, show_##name, NULL)
DEV_ATTR_RO(serial, id.serial);
DEV_ATTR_RO_STR(firmware, pdat->app.fw);
DEV_ATTR_RO(firmware_version, id.fw_version);
DEV_ATTR_RO_STR(hardware, pdat->name);
DEV_ATTR_RO(hardware_version, id.hw_version);
DEV_ATTR_RO(license, id.license);
DEV_ATTR_RO(frequency, id.freq);
DEV_ATTR_RO(txpending, tx.pending);
static struct attribute *softing_pdev_attrs[] = {
&dev_attr_serial.attr,
&dev_attr_firmware.attr,
&dev_attr_firmware_version.attr,
&dev_attr_hardware.attr,
&dev_attr_hardware_version.attr,
&dev_attr_license.attr,
&dev_attr_frequency.attr,
&dev_attr_txpending.attr,
NULL,
};
static const struct attribute_group softing_pdev_group = {
.name = NULL,
.attrs = softing_pdev_attrs,
};
/*
* platform driver
*/
static int softing_pdev_remove(struct platform_device *pdev)
{
struct softing *card = platform_get_drvdata(pdev);
int j;
/* first, disable card*/
softing_card_shutdown(card);
for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
if (!card->net[j])
continue;
softing_netdev_cleanup(card->net[j]);
card->net[j] = NULL;
}
sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
iounmap(card->dpram);
kfree(card);
return 0;
}
static int softing_pdev_probe(struct platform_device *pdev)
{
const struct softing_platform_data *pdat = dev_get_platdata(&pdev->dev);
struct softing *card;
struct net_device *netdev;
struct softing_priv *priv;
struct resource *pres;
int ret;
int j;
if (!pdat) {
dev_warn(&pdev->dev, "no platform data\n");
return -EINVAL;
}
if (pdat->nbus > ARRAY_SIZE(card->net)) {
dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus);
return -EINVAL;
}
card = kzalloc(sizeof(*card), GFP_KERNEL);
if (!card)
return -ENOMEM;
card->pdat = pdat;
card->pdev = pdev;
platform_set_drvdata(pdev, card);
mutex_init(&card->fw.lock);
spin_lock_init(&card->spin);
ret = -EINVAL;
pres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!pres)
goto platform_resource_failed;
card->dpram_phys = pres->start;
card->dpram_size = resource_size(pres);
card->dpram = ioremap_nocache(card->dpram_phys, card->dpram_size);
if (!card->dpram) {
dev_alert(&card->pdev->dev, "dpram ioremap failed\n");
goto ioremap_failed;
}
pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (pres)
card->irq.nr = pres->start;
/* reset card */
ret = softing_card_boot(card);
if (ret < 0) {
dev_alert(&pdev->dev, "failed to boot\n");
goto boot_failed;
}
/* only now, the chip's are known */
card->id.freq = card->pdat->freq;
ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group);
if (ret < 0) {
dev_alert(&card->pdev->dev, "sysfs failed\n");
goto sysfs_failed;
}
for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
card->net[j] = netdev =
softing_netdev_create(card, card->id.chip[j]);
if (!netdev) {
dev_alert(&pdev->dev, "failed to make can[%i]", j);
ret = -ENOMEM;
goto netdev_failed;
}
netdev->dev_id = j;
priv = netdev_priv(card->net[j]);
priv->index = j;
ret = softing_netdev_register(netdev);
if (ret) {
free_candev(netdev);
card->net[j] = NULL;
dev_alert(&card->pdev->dev,
"failed to register can[%i]\n", j);
goto netdev_failed;
}
}
dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name);
return 0;
netdev_failed:
for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
if (!card->net[j])
continue;
softing_netdev_cleanup(card->net[j]);
}
sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
sysfs_failed:
softing_card_shutdown(card);
boot_failed:
iounmap(card->dpram);
ioremap_failed:
platform_resource_failed:
kfree(card);
return ret;
}
static struct platform_driver softing_driver = {
.driver = {
.name = "softing",
.owner = THIS_MODULE,
},
.probe = softing_pdev_probe,
.remove = softing_pdev_remove,
};
module_platform_driver(softing_driver);
MODULE_ALIAS("platform:softing");
MODULE_DESCRIPTION("Softing DPRAM CAN driver");
MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>");
MODULE_LICENSE("GPL v2");
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