can: add the driver for Analog Devices Blackfin on-chip CAN controllers

Signed-off-by: Barry Song <21cnbao@gmail.com>
Signed-off-by: H.J. Oertel <oe@port.de>
Signed-off-by: Wolfgang Grandegger <wg@grandegger.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 783 insertions, 0 deletions

diff --git a/drivers/net/can/bfin_can.c b/drivers/net/can/bfin_can.c
new file mode 100644
index 000000000000..c7fc1de28173
--- /dev/null
+++ b/drivers/net/can/bfin_can.c
@@ -0,0 +1,783 @@
+/*
+ * Blackfin On-Chip CAN Driver
+ *
+ * Copyright 2004-2009 Analog Devices Inc.
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/bitops.h>
+#include <linux/interrupt.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/platform_device.h>
+
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/error.h>
+
+#include <asm/portmux.h>
+
+#define DRV_NAME "bfin_can"
+#define BFIN_CAN_TIMEOUT 100
+
+/*
+ * transmit and receive channels
+ */
+#define TRANSMIT_CHL            24
+#define RECEIVE_STD_CHL         0
+#define RECEIVE_EXT_CHL         4
+#define RECEIVE_RTR_CHL         8
+#define RECEIVE_EXT_RTR_CHL     12
+#define MAX_CHL_NUMBER          32
+
+/*
+ * bfin can registers layout
+ */
+struct bfin_can_mask_regs {
+        u16 aml;
+        u16 dummy1;
+        u16 amh;
+        u16 dummy2;
+};
+
+struct bfin_can_channel_regs {
+        u16 data[8];
+        u16 dlc;
+        u16 dummy1;
+        u16 tsv;
+        u16 dummy2;
+        u16 id0;
+        u16 dummy3;
+        u16 id1;
+        u16 dummy4;
+};
+
+struct bfin_can_regs {
+        /*
+         * global control and status registers
+         */
+        u16 mc1;           /* offset 0 */
+        u16 dummy1;
+        u16 md1;           /* offset 4 */
+        u16 rsv1[13];
+        u16 mbtif1;        /* offset 0x20 */
+        u16 dummy2;
+        u16 mbrif1;        /* offset 0x24 */
+        u16 dummy3;
+        u16 mbim1;         /* offset 0x28 */
+        u16 rsv2[11];
+        u16 mc2;           /* offset 0x40 */
+        u16 dummy4;
+        u16 md2;           /* offset 0x44 */
+        u16 dummy5;
+        u16 trs2;          /* offset 0x48 */
+        u16 rsv3[11];
+        u16 mbtif2;        /* offset 0x60 */
+        u16 dummy6;
+        u16 mbrif2;        /* offset 0x64 */
+        u16 dummy7;
+        u16 mbim2;         /* offset 0x68 */
+        u16 rsv4[11];
+        u16 clk;           /* offset 0x80 */
+        u16 dummy8;
+        u16 timing;        /* offset 0x84 */
+        u16 rsv5[3];
+        u16 status;        /* offset 0x8c */
+        u16 dummy9;
+        u16 cec;           /* offset 0x90 */
+        u16 dummy10;
+        u16 gis;           /* offset 0x94 */
+        u16 dummy11;
+        u16 gim;           /* offset 0x98 */
+        u16 rsv6[3];
+        u16 ctrl;          /* offset 0xa0 */
+        u16 dummy12;
+        u16 intr;          /* offset 0xa4 */
+        u16 rsv7[7];
+        u16 esr;           /* offset 0xb4 */
+        u16 rsv8[37];
+
+        /*
+         * channel(mailbox) mask and message registers
+         */
+        struct bfin_can_mask_regs msk[MAX_CHL_NUMBER];    /* offset 0x100 */
+        struct bfin_can_channel_regs chl[MAX_CHL_NUMBER]; /* offset 0x200 */
+};
+
+/*
+ * bfin can private data
+ */
+struct bfin_can_priv {
+        struct can_priv can;    /* must be the first member */
+        struct net_device *dev;
+        void __iomem *membase;
+        int rx_irq;
+        int tx_irq;
+        int err_irq;
+        unsigned short *pin_list;
+};
+
+/*
+ * bfin can timing parameters
+ */
+static struct can_bittiming_const bfin_can_bittiming_const = {
+        .name = DRV_NAME,
+        .tseg1_min = 1,
+        .tseg1_max = 16,
+        .tseg2_min = 1,
+        .tseg2_max = 8,
+        .sjw_max = 4,
+        /*
+         * Although the BRP field can be set to any value, it is recommended
+         * that the value be greater than or equal to 4, as restrictions
+         * apply to the bit timing configuration when BRP is less than 4.
+         */
+        .brp_min = 4,
+        .brp_max = 1024,
+        .brp_inc = 1,
+};
+
+static int bfin_can_set_bittiming(struct net_device *dev)
+{
+        struct bfin_can_priv *priv = netdev_priv(dev);
+        struct bfin_can_regs __iomem *reg = priv->membase;
+        struct can_bittiming *bt = &priv->can.bittiming;
+        u16 clk, timing;
+
+        clk = bt->brp - 1;
+        timing = ((bt->sjw - 1) << 8) | (bt->prop_seg + bt->phase_seg1 - 1) |
+                ((bt->phase_seg2 - 1) << 4);
+
+        /*
+         * If the SAM bit is set, the input signal is oversampled three times
+         * at the SCLK rate.
+         */
+        if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
+                timing |= SAM;
+
+        bfin_write16(&reg->clk, clk);
+        bfin_write16(&reg->timing, timing);
+
+        dev_info(dev->dev.parent, "setting CLOCK=0x%04x TIMING=0x%04x\n",
+                        clk, timing);
+
+        return 0;
+}
+
+static void bfin_can_set_reset_mode(struct net_device *dev)
+{
+        struct bfin_can_priv *priv = netdev_priv(dev);
+        struct bfin_can_regs __iomem *reg = priv->membase;
+        int timeout = BFIN_CAN_TIMEOUT;
+        int i;
+
+        /* disable interrupts */
+        bfin_write16(&reg->mbim1, 0);
+        bfin_write16(&reg->mbim2, 0);
+        bfin_write16(&reg->gim, 0);
+
+        /* reset can and enter configuration mode */
+        bfin_write16(&reg->ctrl, SRS | CCR);
+        SSYNC();
+        bfin_write16(&reg->ctrl, CCR);
+        SSYNC();
+        while (!(bfin_read16(&reg->ctrl) & CCA)) {
+                udelay(10);
+                if (--timeout == 0) {
+                        dev_err(dev->dev.parent,
+                                        "fail to enter configuration mode\n");
+                        BUG();
+                }
+        }
+
+        /*
+         * All mailbox configurations are marked as inactive
+         * by writing to CAN Mailbox Configuration Registers 1 and 2
+         * For all bits: 0 - Mailbox disabled, 1 - Mailbox enabled
+         */
+        bfin_write16(&reg->mc1, 0);
+        bfin_write16(&reg->mc2, 0);
+
+        /* Set Mailbox Direction */
+        bfin_write16(&reg->md1, 0xFFFF);   /* mailbox 1-16 are RX */
+        bfin_write16(&reg->md2, 0);   /* mailbox 17-32 are TX */
+
+        /* RECEIVE_STD_CHL */
+        for (i = 0; i < 2; i++) {
+                bfin_write16(&reg->chl[RECEIVE_STD_CHL + i].id0, 0);
+                bfin_write16(&reg->chl[RECEIVE_STD_CHL + i].id1, AME);
+                bfin_write16(&reg->chl[RECEIVE_STD_CHL + i].dlc, 0);
+                bfin_write16(&reg->msk[RECEIVE_STD_CHL + i].amh, 0x1FFF);
+                bfin_write16(&reg->msk[RECEIVE_STD_CHL + i].aml, 0xFFFF);
+        }
+
+        /* RECEIVE_EXT_CHL */
+        for (i = 0; i < 2; i++) {
+                bfin_write16(&reg->chl[RECEIVE_EXT_CHL + i].id0, 0);
+                bfin_write16(&reg->chl[RECEIVE_EXT_CHL + i].id1, AME | IDE);
+                bfin_write16(&reg->chl[RECEIVE_EXT_CHL + i].dlc, 0);
+                bfin_write16(&reg->msk[RECEIVE_EXT_CHL + i].amh, 0x1FFF);
+                bfin_write16(&reg->msk[RECEIVE_EXT_CHL + i].aml, 0xFFFF);
+        }
+
+        bfin_write16(&reg->mc2, BIT(TRANSMIT_CHL - 16));
+        bfin_write16(&reg->mc1, BIT(RECEIVE_STD_CHL) + BIT(RECEIVE_EXT_CHL));
+        SSYNC();
+
+        priv->can.state = CAN_STATE_STOPPED;
+}
+
+static void bfin_can_set_normal_mode(struct net_device *dev)
+{
+        struct bfin_can_priv *priv = netdev_priv(dev);
+        struct bfin_can_regs __iomem *reg = priv->membase;
+        int timeout = BFIN_CAN_TIMEOUT;
+
+        /*
+         * leave configuration mode
+         */
+        bfin_write16(&reg->ctrl, bfin_read16(&reg->ctrl) & ~CCR);
+
+        while (bfin_read16(&reg->status) & CCA) {
+                udelay(10);
+                if (--timeout == 0) {
+                        dev_err(dev->dev.parent,
+                                        "fail to leave configuration mode\n");
+                        BUG();
+                }
+        }
+
+        /*
+         * clear _All_  tx and rx interrupts
+         */
+        bfin_write16(&reg->mbtif1, 0xFFFF);
+        bfin_write16(&reg->mbtif2, 0xFFFF);
+        bfin_write16(&reg->mbrif1, 0xFFFF);
+        bfin_write16(&reg->mbrif2, 0xFFFF);
+
+        /*
+         * clear global interrupt status register
+         */
+        bfin_write16(&reg->gis, 0x7FF); /* overwrites with '1' */
+
+        /*
+         * Initialize Interrupts
+         * - set bits in the mailbox interrupt mask register
+         * - global interrupt mask
+         */
+        bfin_write16(&reg->mbim1, BIT(RECEIVE_STD_CHL) + BIT(RECEIVE_EXT_CHL));
+        bfin_write16(&reg->mbim2, BIT(TRANSMIT_CHL - 16));
+
+        bfin_write16(&reg->gim, EPIM | BOIM | RMLIM);
+        SSYNC();
+}
+
+static void bfin_can_start(struct net_device *dev)
+{
+        struct bfin_can_priv *priv = netdev_priv(dev);
+
+        /* enter reset mode */
+        if (priv->can.state != CAN_STATE_STOPPED)
+                bfin_can_set_reset_mode(dev);
+
+        /* leave reset mode */
+        bfin_can_set_normal_mode(dev);
+}
+
+static int bfin_can_set_mode(struct net_device *dev, enum can_mode mode)
+{
+        switch (mode) {
+        case CAN_MODE_START:
+                bfin_can_start(dev);
+                if (netif_queue_stopped(dev))
+                        netif_wake_queue(dev);
+                break;
+
+        default:
+                return -EOPNOTSUPP;
+        }
+
+        return 0;
+}
+
+static int bfin_can_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+        struct bfin_can_priv *priv = netdev_priv(dev);
+        struct bfin_can_regs __iomem *reg = priv->membase;
+        struct can_frame *cf = (struct can_frame *)skb->data;
+        u8 dlc = cf->can_dlc;
+        canid_t id = cf->can_id;
+        u8 *data = cf->data;
+        u16 val;
+        int i;
+
+        netif_stop_queue(dev);
+
+        /* fill id */
+        if (id & CAN_EFF_FLAG) {
+                bfin_write16(&reg->chl[TRANSMIT_CHL].id0, id);
+                if (id & CAN_RTR_FLAG)
+                        writew(((id & 0x1FFF0000) >> 16) | IDE | AME | RTR,
+                                        &reg->chl[TRANSMIT_CHL].id1);
+                else
+                        writew(((id & 0x1FFF0000) >> 16) | IDE | AME,
+                                        &reg->chl[TRANSMIT_CHL].id1);
+
+        } else {
+                if (id & CAN_RTR_FLAG)
+                        writew((id << 2) | AME | RTR,
+                                &reg->chl[TRANSMIT_CHL].id1);
+                else
+                        bfin_write16(&reg->chl[TRANSMIT_CHL].id1,
+                                        (id << 2) | AME);
+        }
+
+        /* fill payload */
+        for (i = 0; i < 8; i += 2) {
+                val = ((7 - i) < dlc ? (data[7 - i]) : 0) +
+                        ((6 - i) < dlc ? (data[6 - i] << 8) : 0);
+                bfin_write16(&reg->chl[TRANSMIT_CHL].data[i], val);
+        }
+
+        /* fill data length code */
+        bfin_write16(&reg->chl[TRANSMIT_CHL].dlc, dlc);
+
+        dev->trans_start = jiffies;
+
+        can_put_echo_skb(skb, dev, 0);
+
+        /* set transmit request */
+        bfin_write16(&reg->trs2, BIT(TRANSMIT_CHL - 16));
+
+        return 0;
+}
+
+static void bfin_can_rx(struct net_device *dev, u16 isrc)
+{
+        struct bfin_can_priv *priv = netdev_priv(dev);
+        struct net_device_stats *stats = &dev->stats;
+        struct bfin_can_regs __iomem *reg = priv->membase;
+        struct can_frame *cf;
+        struct sk_buff *skb;
+        int obj;
+        int i;
+        u16 val;
+
+        skb = alloc_can_skb(dev, &cf);
+        if (skb == NULL)
+                return;
+
+        /* get id */
+        if (isrc & BIT(RECEIVE_EXT_CHL)) {
+                /* extended frame format (EFF) */
+                cf->can_id = ((bfin_read16(&reg->chl[RECEIVE_EXT_CHL].id1)
+                             & 0x1FFF) << 16)
+                             + bfin_read16(&reg->chl[RECEIVE_EXT_CHL].id0);
+                cf->can_id |= CAN_EFF_FLAG;
+                obj = RECEIVE_EXT_CHL;
+        } else {
+                /* standard frame format (SFF) */
+                cf->can_id = (bfin_read16(&reg->chl[RECEIVE_STD_CHL].id1)
+                             & 0x1ffc) >> 2;
+                obj = RECEIVE_STD_CHL;
+        }
+        if (bfin_read16(&reg->chl[obj].id1) & RTR)
+                cf->can_id |= CAN_RTR_FLAG;
+
+        /* get data length code */
+        cf->can_dlc = bfin_read16(&reg->chl[obj].dlc);
+
+        /* get payload */
+        for (i = 0; i < 8; i += 2) {
+                val = bfin_read16(&reg->chl[obj].data[i]);
+                cf->data[7 - i] = (7 - i) < cf->can_dlc ? val : 0;
+                cf->data[6 - i] = (6 - i) < cf->can_dlc ? (val >> 8) : 0;
+        }
+
+        netif_rx(skb);
+
+        stats->rx_packets++;
+        stats->rx_bytes += cf->can_dlc;
+}
+
+static int bfin_can_err(struct net_device *dev, u16 isrc, u16 status)
+{
+        struct bfin_can_priv *priv = netdev_priv(dev);
+        struct bfin_can_regs __iomem *reg = priv->membase;
+        struct net_device_stats *stats = &dev->stats;
+        struct can_frame *cf;
+        struct sk_buff *skb;
+        enum can_state state = priv->can.state;
+
+        skb = alloc_can_err_skb(dev, &cf);
+        if (skb == NULL)
+                return -ENOMEM;
+
+        if (isrc & RMLIS) {
+                /* data overrun interrupt */
+                dev_dbg(dev->dev.parent, "data overrun interrupt\n");
+                cf->can_id |= CAN_ERR_CRTL;
+                cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
+                stats->rx_over_errors++;
+                stats->rx_errors++;
+        }
+
+        if (isrc & BOIS) {
+                dev_dbg(dev->dev.parent, "bus-off mode interrupt\n");
+                state = CAN_STATE_BUS_OFF;
+                cf->can_id |= CAN_ERR_BUSOFF;
+                can_bus_off(dev);
+        }
+
+        if (isrc & EPIS) {
+                /* error passive interrupt */
+                dev_dbg(dev->dev.parent, "error passive interrupt\n");
+                state = CAN_STATE_ERROR_PASSIVE;
+        }
+
+        if ((isrc & EWTIS) || (isrc & EWRIS)) {
+                dev_dbg(dev->dev.parent,
+                                "Error Warning Transmit/Receive Interrupt\n");
+                state = CAN_STATE_ERROR_WARNING;
+        }
+
+        if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
+                                state == CAN_STATE_ERROR_PASSIVE)) {
+                u16 cec = bfin_read16(&reg->cec);
+                u8 rxerr = cec;
+                u8 txerr = cec >> 8;
+
+                cf->can_id |= CAN_ERR_CRTL;
+                if (state == CAN_STATE_ERROR_WARNING) {
+                        priv->can.can_stats.error_warning++;
+                        cf->data[1] = (txerr > rxerr) ?
+                                CAN_ERR_CRTL_TX_WARNING :
+                                CAN_ERR_CRTL_RX_WARNING;
+                } else {
+                        priv->can.can_stats.error_passive++;
+                        cf->data[1] = (txerr > rxerr) ?
+                                CAN_ERR_CRTL_TX_PASSIVE :
+                                CAN_ERR_CRTL_RX_PASSIVE;
+                }
+        }
+
+        if (status) {
+                priv->can.can_stats.bus_error++;
+
+                cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
+
+                if (status & BEF)
+                        cf->data[2] |= CAN_ERR_PROT_BIT;
+                else if (status & FER)
+                        cf->data[2] |= CAN_ERR_PROT_FORM;
+                else if (status & SER)
+                        cf->data[2] |= CAN_ERR_PROT_STUFF;
+                else
+                        cf->data[2] |= CAN_ERR_PROT_UNSPEC;
+        }
+
+        priv->can.state = state;
+
+        netif_rx(skb);
+
+        stats->rx_packets++;
+        stats->rx_bytes += cf->can_dlc;
+
+        return 0;
+}
+
+irqreturn_t bfin_can_interrupt(int irq, void *dev_id)
+{
+        struct net_device *dev = dev_id;
+        struct bfin_can_priv *priv = netdev_priv(dev);
+        struct bfin_can_regs __iomem *reg = priv->membase;
+        struct net_device_stats *stats = &dev->stats;
+        u16 status, isrc;
+
+        if ((irq == priv->tx_irq) && bfin_read16(&reg->mbtif2)) {
+                /* transmission complete interrupt */
+                bfin_write16(&reg->mbtif2, 0xFFFF);
+                stats->tx_packets++;
+                stats->tx_bytes += bfin_read16(&reg->chl[TRANSMIT_CHL].dlc);
+                can_get_echo_skb(dev, 0);
+                netif_wake_queue(dev);
+        } else if ((irq == priv->rx_irq) && bfin_read16(&reg->mbrif1)) {
+                /* receive interrupt */
+                isrc = bfin_read16(&reg->mbrif1);
+                bfin_write16(&reg->mbrif1, 0xFFFF);
+                bfin_can_rx(dev, isrc);
+        } else if ((irq == priv->err_irq) && bfin_read16(&reg->gis)) {
+                /* error interrupt */
+                isrc = bfin_read16(&reg->gis);
+                status = bfin_read16(&reg->esr);
+                bfin_write16(&reg->gis, 0x7FF);
+                bfin_can_err(dev, isrc, status);
+        } else {
+                return IRQ_NONE;
+        }
+
+        return IRQ_HANDLED;
+}
+
+static int bfin_can_open(struct net_device *dev)
+{
+        struct bfin_can_priv *priv = netdev_priv(dev);
+        int err;
+
+        /* set chip into reset mode */
+        bfin_can_set_reset_mode(dev);
+
+        /* common open */
+        err = open_candev(dev);
+        if (err)
+                goto exit_open;
+
+        /* register interrupt handler */
+        err = request_irq(priv->rx_irq, &bfin_can_interrupt, 0,
+                        "bfin-can-rx", dev);
+        if (err)
+                goto exit_rx_irq;
+        err = request_irq(priv->tx_irq, &bfin_can_interrupt, 0,
+                        "bfin-can-tx", dev);
+        if (err)
+                goto exit_tx_irq;
+        err = request_irq(priv->err_irq, &bfin_can_interrupt, 0,
+                        "bfin-can-err", dev);
+        if (err)
+                goto exit_err_irq;
+
+        bfin_can_start(dev);
+
+        netif_start_queue(dev);
+
+        return 0;
+
+exit_err_irq:
+        free_irq(priv->tx_irq, dev);
+exit_tx_irq:
+        free_irq(priv->rx_irq, dev);
+exit_rx_irq:
+        close_candev(dev);
+exit_open:
+        return err;
+}
+
+static int bfin_can_close(struct net_device *dev)
+{
+        struct bfin_can_priv *priv = netdev_priv(dev);
+
+        netif_stop_queue(dev);
+        bfin_can_set_reset_mode(dev);
+
+        close_candev(dev);
+
+        free_irq(priv->rx_irq, dev);
+        free_irq(priv->tx_irq, dev);
+        free_irq(priv->err_irq, dev);
+
+        return 0;
+}
+
+struct net_device *alloc_bfin_candev(void)
+{
+        struct net_device *dev;
+        struct bfin_can_priv *priv;
+
+        dev = alloc_candev(sizeof(*priv));
+        if (!dev)
+                return NULL;
+
+        priv = netdev_priv(dev);
+
+        priv->dev = dev;
+        priv->can.bittiming_const = &bfin_can_bittiming_const;
+        priv->can.do_set_bittiming = bfin_can_set_bittiming;
+        priv->can.do_set_mode = bfin_can_set_mode;
+
+        return dev;
+}
+
+static const struct net_device_ops bfin_can_netdev_ops = {
+        .ndo_open               = bfin_can_open,
+        .ndo_stop               = bfin_can_close,
+        .ndo_start_xmit         = bfin_can_start_xmit,
+};
+
+static int __devinit bfin_can_probe(struct platform_device *pdev)
+{
+        int err;
+        struct net_device *dev;
+        struct bfin_can_priv *priv;
+        struct resource *res_mem, *rx_irq, *tx_irq, *err_irq;
+        unsigned short *pdata;
+
+        pdata = pdev->dev.platform_data;
+        if (!pdata) {
+                dev_err(&pdev->dev, "No platform data provided!\n");
+                err = -EINVAL;
+                goto exit;
+        }
+
+        res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        rx_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+        tx_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
+        err_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 2);
+        if (!res_mem || !rx_irq || !tx_irq || !err_irq) {
+                err = -EINVAL;
+                goto exit;
+        }
+
+        if (!request_mem_region(res_mem->start, resource_size(res_mem),
+                                dev_name(&pdev->dev))) {
+                err = -EBUSY;
+                goto exit;
+        }
+
+        /* request peripheral pins */
+        err = peripheral_request_list(pdata, dev_name(&pdev->dev));
+        if (err)
+                goto exit_mem_release;
+
+        dev = alloc_bfin_candev();
+        if (!dev) {
+                err = -ENOMEM;
+                goto exit_peri_pin_free;
+        }
+
+        priv = netdev_priv(dev);
+        priv->membase = (void __iomem *)res_mem->start;
+        priv->rx_irq = rx_irq->start;
+        priv->tx_irq = tx_irq->start;
+        priv->err_irq = err_irq->start;
+        priv->pin_list = pdata;
+        priv->can.clock.freq = get_sclk();
+
+        dev_set_drvdata(&pdev->dev, dev);
+        SET_NETDEV_DEV(dev, &pdev->dev);
+
+        dev->flags |= IFF_ECHO; /* we support local echo */
+        dev->netdev_ops = &bfin_can_netdev_ops;
+
+        bfin_can_set_reset_mode(dev);
+
+        err = register_candev(dev);
+        if (err) {
+                dev_err(&pdev->dev, "registering failed (err=%d)\n", err);
+                goto exit_candev_free;
+        }
+
+        dev_info(&pdev->dev,
+                "%s device registered"
+                "(&reg_base=%p, rx_irq=%d, tx_irq=%d, err_irq=%d, sclk=%d)\n",
+                DRV_NAME, (void *)priv->membase, priv->rx_irq,
+                priv->tx_irq, priv->err_irq, priv->can.clock.freq);
+        return 0;
+
+exit_candev_free:
+        free_candev(dev);
+exit_peri_pin_free:
+        peripheral_free_list(pdata);
+exit_mem_release:
+        release_mem_region(res_mem->start, resource_size(res_mem));
+exit:
+        return err;
+}
+
+static int __devexit bfin_can_remove(struct platform_device *pdev)
+{
+        struct net_device *dev = dev_get_drvdata(&pdev->dev);
+        struct bfin_can_priv *priv = netdev_priv(dev);
+        struct resource *res;
+
+        bfin_can_set_reset_mode(dev);
+
+        unregister_candev(dev);
+
+        dev_set_drvdata(&pdev->dev, NULL);
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        release_mem_region(res->start, resource_size(res));
+
+        peripheral_free_list(priv->pin_list);
+
+        free_candev(dev);
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int bfin_can_suspend(struct platform_device *pdev, pm_message_t mesg)
+{
+        struct net_device *dev = dev_get_drvdata(&pdev->dev);
+        struct bfin_can_priv *priv = netdev_priv(dev);
+        struct bfin_can_regs __iomem *reg = priv->membase;
+        int timeout = BFIN_CAN_TIMEOUT;
+
+        if (netif_running(dev)) {
+                /* enter sleep mode */
+                bfin_write16(&reg->ctrl, bfin_read16(&reg->ctrl) | SMR);
+                SSYNC();
+                while (!(bfin_read16(&reg->intr) & SMACK)) {
+                        udelay(10);
+                        if (--timeout == 0) {
+                                dev_err(dev->dev.parent,
+                                                "fail to enter sleep mode\n");
+                                BUG();
+                        }
+                }
+        }
+
+        return 0;
+}
+
+static int bfin_can_resume(struct platform_device *pdev)
+{
+        struct net_device *dev = dev_get_drvdata(&pdev->dev);
+        struct bfin_can_priv *priv = netdev_priv(dev);
+        struct bfin_can_regs __iomem *reg = priv->membase;
+
+        if (netif_running(dev)) {
+                /* leave sleep mode */
+                bfin_write16(&reg->intr, 0);
+                SSYNC();
+        }
+
+        return 0;
+}
+#else
+#define bfin_can_suspend NULL
+#define bfin_can_resume NULL
+#endif  /* CONFIG_PM */
+
+static struct platform_driver bfin_can_driver = {
+        .probe = bfin_can_probe,
+        .remove = __devexit_p(bfin_can_remove),
+        .suspend = bfin_can_suspend,
+        .resume = bfin_can_resume,
+        .driver = {
+                .name = DRV_NAME,
+                .owner = THIS_MODULE,
+        },
+};
+
+static int __init bfin_can_init(void)
+{
+        return platform_driver_register(&bfin_can_driver);
+}
+module_init(bfin_can_init);
+
+static void __exit bfin_can_exit(void)
+{
+        platform_driver_unregister(&bfin_can_driver);
+}
+module_exit(bfin_can_exit);
+
+MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Blackfin on-chip CAN netdevice driver");