Merge remote branch 'rmk/for-linus' into for-linus

* rmk/for-linus: (1557 commits)
  ARM: 6806/1: irq: introduce entry and exit functions for chained handlers
  ARM: 6781/1: Thumb-2: Work around buggy Thumb-2 short branch relocations in gas
  ARM: 6747/1: P2V: Thumb2 support
  ARM: 6798/1: aout-core: zero thread debug registers in a.out core dump
  ARM: 6796/1: Footbridge: Fix I/O mappings for NOMMU mode
  ARM: 6784/1: errata: no automatic Store Buffer drain on Cortex-A9
  ARM: 6772/1: errata: possible fault MMU translations following an ASID switch
  ARM: 6776/1: mach-ux500: activate fix for errata 753970
  ARM: 6794/1: SPEAr: Append UL to device address macros.
  ARM: 6793/1: SPEAr: Remove unused *_SIZE macros from spear*.h files
  ARM: 6792/1: SPEAr: Replace SIZE macro's with SZ_4K macros
  ARM: 6791/1: SPEAr3xx: Declare device structures after shirq code
  ARM: 6790/1: SPEAr: Clock Framework: Rename usbd clock and align apb_clk entry
  ARM: 6789/1: SPEAr3xx: Rename sdio to sdhci
  ARM: 6788/1: SPEAr: Include mach/hardware.h instead of mach/spear.h
  ARM: 6787/1: SPEAr: Reorder #includes in .h & .c files.
  ARM: 6681/1: SPEAr: add debugfs support to clk API
  ARM: 6703/1: SPEAr: update clk API support
  ARM: 6679/1: SPEAr: make clk API functions more generic
  ARM: 6737/1: SPEAr: formalized timer support
  ...

Conflicts:
	arch/arm/mach-msm/board-msm7x27.c
	arch/arm/mach-msm/board-msm7x30.c
	arch/arm/mach-msm/board-qsd8x50.c
	arch/arm/mach-msm/board-sapphire.c
	arch/arm/mach-msm/include/mach/memory.h

1 files changed, 894 insertions, 0 deletions

diff --git a/drivers/net/can/softing/softing_main.c b/drivers/net/can/softing/softing_main.c
new file mode 100644
index 000000000000..aeea9f9ff6e8
--- /dev/null
+++ b/drivers/net/can/softing/softing_main.c
@@ -0,0 +1,894 @@
+/*
+ * 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 = {
+        .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 __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");