can: add driver for Softing card
This patch adds a driver for the platform:softing device.
This will create (up to) 2 CAN network devices from 1
platform:softing device
Signed-off-by: Kurt Van Dijck <kurt.van.dijck@eia.be>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/can/softing/softing_main.c b/drivers/net/can/softing/softing_main.c
new file mode 100644
index 0000000..5157e15
--- /dev/null
+++ b/drivers/net/can/softing/softing_main.c
@@ -0,0 +1,893 @@
+/*
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.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 usefull, 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 __devinit 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 = strict_strtoul(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,
+};
+
+static const struct can_bittiming_const softing_btr_const = {
+ .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 __devinit 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 __devinit 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 __devexit 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 __devinit int softing_pdev_probe(struct platform_device *pdev)
+{
+ const struct softing_platform_data *pdat = pdev->dev.platform_data;
+ 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 = pres->end - pres->start + 1;
+ 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;
+ }
+
+ ret = -ENOMEM;
+ 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);
+ goto netdev_failed;
+ }
+ 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 = __devexit_p(softing_pdev_remove),
+};
+
+MODULE_ALIAS("platform:softing");
+
+static int __init softing_start(void)
+{
+ return platform_driver_register(&softing_driver);
+}
+
+static void __exit softing_stop(void)
+{
+ platform_driver_unregister(&softing_driver);
+}
+
+module_init(softing_start);
+module_exit(softing_stop);
+
+MODULE_DESCRIPTION("Softing DPRAM CAN driver");
+MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>");
+MODULE_LICENSE("GPL v2");