Date:	Thu, 10 Dec 2009 15:27:52 +0800
From:	Barry Song <21cnbao@...il.com>
To:	wg@...ndegger.com, davem@...emloft.net
CC:	socketcan-core@...ts.berlios.de,
	uclinux-dist-devel@...ckfin.uclinux.org, netdev@...r.kernel.org,
	Barry Song <21cnbao@...il.com>, "H.J. Oertel" <oe@...t.de>
Subject: [PATCH v3] add the driver for Analog Devices Blackfin on-chip CAN controllers

Signed-off-by: Barry Song <21cnbao@...il.com>
Signed-off-by: H.J. Oertel <oe@...t.de>
---
 -v3: use structures to describe the layout of registers

 drivers/net/can/Kconfig    |    9 +
 drivers/net/can/Makefile   |    1 +
 drivers/net/can/bfin_can.c |  836 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 846 insertions(+), 0 deletions(-)
 create mode 100644 drivers/net/can/bfin_can.c

diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
index bb803fa..8c485aa 100644
--- a/drivers/net/can/Kconfig
+++ b/drivers/net/can/Kconfig
@@ -54,6 +54,15 @@ config CAN_MCP251X
 	---help---
 	  Driver for the Microchip MCP251x SPI CAN controllers.
 
+config CAN_BFIN
+	depends on CAN_DEV && (BF534 || BF536 || BF537 || BF538 || BF539 || BF54x)
+	tristate "Analog Devices Blackfin on-chip CAN"
+	---help---
+	  Driver for the Analog Devices Blackfin on-chip CAN controllers
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called bfin_can.
+
 source "drivers/net/can/mscan/Kconfig"
 
 source "drivers/net/can/sja1000/Kconfig"
diff --git a/drivers/net/can/Makefile b/drivers/net/can/Makefile
index 56899fe..7a702f2 100644
--- a/drivers/net/can/Makefile
+++ b/drivers/net/can/Makefile
@@ -14,5 +14,6 @@ obj-$(CONFIG_CAN_MSCAN)		+= mscan/
 obj-$(CONFIG_CAN_AT91)		+= at91_can.o
 obj-$(CONFIG_CAN_TI_HECC)	+= ti_hecc.o
 obj-$(CONFIG_CAN_MCP251X)	+= mcp251x.o
+obj-$(CONFIG_CAN_BFIN)		+= bfin_can.o
 
 ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
diff --git a/drivers/net/can/bfin_can.c b/drivers/net/can/bfin_can.c
new file mode 100644
index 0000000..b94169d
--- /dev/null
+++ b/drivers/net/can/bfin_can.c
@@ -0,0 +1,836 @@
+/*
+ * 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/types.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,
+};
+
+/*
+ * inline functions to read/write ID, data length and payload of CAN frame
+ */
+static inline void bfin_can_write_oid(struct bfin_can_priv *priv, int channel, canid_t id)
+{
+	struct bfin_can_regs *reg = priv->membase;
+
+	writew((id << 2) + AME, &reg->chl[channel].id1);
+}
+
+static inline void bfin_can_write_oid_rtr(struct bfin_can_priv *priv, int channel, canid_t id)
+{
+	struct bfin_can_regs *reg = priv->membase;
+
+	writew((id << 2) + AME + RTR, &reg->chl[channel].id1);
+}
+
+static inline canid_t bfin_can_read_oid(struct bfin_can_priv *priv, int channel)
+{
+	struct bfin_can_regs *reg = priv->membase;
+
+	return (readw(&reg->chl[channel].id1) & 0x1ffc) >> 2;
+}
+
+static inline void bfin_can_write_xoid(struct bfin_can_priv *priv, int channel, canid_t id)
+{
+	struct bfin_can_regs *reg = priv->membase;
+
+	writew(id, &reg->chl[channel].id0);
+	writew(((id & 0x1FFF0000) >> 16) + IDE + AME, &reg->chl[channel].id1);
+}
+
+static inline void bfin_can_write_xoid_rtr(struct bfin_can_priv *priv, int channel, canid_t id)
+{
+	struct bfin_can_regs *reg = priv->membase;
+
+	writew(id, &reg->chl[channel].id0);
+	writew(((id & 0x1FFF0000) >> 16) + IDE + AME + RTR, &reg->chl[channel].id1);
+}
+
+static inline canid_t bfin_can_read_xoid(struct bfin_can_priv *priv, int channel)
+{
+	struct bfin_can_regs *reg = priv->membase;
+
+	return ((readw(&reg->chl[channel].id1) & 0x1FFF) << 16) + readw(&reg->chl[channel].id0);
+}
+
+static inline void bfin_can_write_dlc(struct bfin_can_priv *priv, int channel, u8 dlc)
+{
+	struct bfin_can_regs *reg = priv->membase;
+
+	writew(dlc, &reg->chl[channel].dlc);
+}
+
+static inline u8 bfin_can_read_dlc(struct bfin_can_priv *priv, int channel)
+{
+	struct bfin_can_regs *reg = priv->membase;
+
+	return readw(&reg->chl[channel].dlc);
+}
+
+static inline void bfin_can_write_data(struct bfin_can_priv *priv, int channel, u8 *data, u8 dlc)
+{
+	struct bfin_can_regs *reg = priv->membase;
+	int i;
+	u16 val;
+
+	for (i = 0; i < 8; i += 2) {
+		val = ((7 - i) < dlc ? (data[7 - i]) : 0) +
+			((6 - i) < dlc ? (data[6 - i] << 8) : 0);
+		writew(val, &reg->chl[channel].data[i]);
+	}
+}
+
+static inline void bfin_can_read_data(struct bfin_can_priv *priv, int channel, u8 *data, u8 dlc)
+{
+	struct bfin_can_regs *reg = priv->membase;
+	int i;
+	u16 val;
+
+	for (i = 0; i < 8; i += 2) {
+		val = readw(&reg->chl[channel].data[i]);
+		data[7 - i] = (7 - i) < dlc ? val : 0;
+		data[6 - i] = (6 - i) < dlc ? (val >> 8) : 0;
+	}
+}
+
+static int bfin_can_set_bittiming(struct net_device *dev)
+{
+	struct bfin_can_priv *priv = netdev_priv(dev);
+	struct bfin_can_regs *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;
+
+	writew(clk, &reg->clk);
+	writew(timing, &reg->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 *reg = priv->membase;
+	int timeout = BFIN_CAN_TIMEOUT;
+	int i;
+
+	/* disable interrupts */
+	writew(0, &reg->mbim1);
+	writew(0, &reg->mbim2);
+	writew(0, &reg->gim);
+
+	/* reset can and enter configuration mode */
+	writew(SRS | CCR, &reg->ctrl);
+	SSYNC();
+	writew(CCR, &reg->ctrl);
+	SSYNC();
+	while (!(readw(&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
+	 */
+	writew(0, &reg->mc1);
+	writew(0, &reg->mc2);
+
+	/* Set Mailbox Direction */
+	writew(0xFFFF, &reg->md1);   /* mailbox 1-16 are RX */
+	writew(0, &reg->md2);   /* mailbox 17-32 are TX */
+
+	/* RECEIVE_STD_CHL */
+	for (i = 0; i < 2; i++) {
+		writew(0, &reg->chl[RECEIVE_STD_CHL + i].id0);
+		writew(AME, &reg->chl[RECEIVE_STD_CHL + i].id1);
+		writew(0, &reg->chl[RECEIVE_STD_CHL + i].dlc);
+		writew(0x1FFF, &reg->msk[RECEIVE_STD_CHL + i].amh);
+		writew(0xFFFF, &reg->msk[RECEIVE_STD_CHL + i].aml);
+	}
+
+	/* RECEIVE_EXT_CHL */
+	for (i = 0; i < 2; i++) {
+		writew(0, &reg->chl[RECEIVE_EXT_CHL + i].id0);
+		writew(AME | IDE, &reg->chl[RECEIVE_EXT_CHL + i].id1);
+		writew(0, &reg->chl[RECEIVE_EXT_CHL + i].dlc);
+		writew(0x1FFF, &reg->msk[RECEIVE_EXT_CHL + i].amh);
+		writew(0xFFFF, &reg->msk[RECEIVE_EXT_CHL + i].aml);
+	}
+
+	writew(BIT(TRANSMIT_CHL - 16), &reg->mc2);
+	writew(BIT(RECEIVE_STD_CHL) + BIT(RECEIVE_EXT_CHL), &reg->mc1);
+	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 *reg = priv->membase;
+	int timeout = BFIN_CAN_TIMEOUT;
+
+	/*
+	 * leave configuration mode
+	 */
+	writew(readw(&reg->ctrl) & ~CCR, &reg->ctrl);
+
+	while (readw(&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
+	 */
+	writew(0xFFFF, &reg->mbtif1);
+	writew(0xFFFF, &reg->mbtif2);
+	writew(0xFFFF, &reg->mbrif1);
+	writew(0xFFFF, &reg->mbrif2);
+
+	/*
+	 * clear global interrupt status register
+	 */
+	writew(0x7FF, &reg->gis); /* overwrites with '1' */
+
+	/*
+	 * Initialize Interrupts
+	 * - set bits in the mailbox interrupt mask register
+	 * - global interrupt mask
+	 */
+	writew(BIT(RECEIVE_STD_CHL) + BIT(RECEIVE_EXT_CHL), &reg->mbim1);
+	writew(BIT(TRANSMIT_CHL - 16), &reg->mbim2);
+
+	writew(EPIM | BOIM | RMLIM, &reg->gim);
+	SSYNC();
+}
+
+static void bfin_can_start(struct net_device *dev)
+{
+	struct bfin_can_priv *priv = netdev_priv(dev);
+
+	/* leave 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 *reg = priv->membase;
+	struct can_frame *cf = (struct can_frame *)skb->data;
+	u8 dlc;
+	canid_t id;
+
+	netif_stop_queue(dev);
+
+	dlc = cf->can_dlc;
+	id = cf->can_id;
+
+	/* fill id and data length code */
+	if (id & CAN_EFF_FLAG) {
+		if (id & CAN_RTR_FLAG)
+			bfin_can_write_xoid_rtr(priv, TRANSMIT_CHL, id);
+		else
+			bfin_can_write_xoid(priv, TRANSMIT_CHL, id);
+	} else {
+		if (id & CAN_RTR_FLAG)
+			bfin_can_write_oid_rtr(priv, TRANSMIT_CHL, id);
+		else
+			bfin_can_write_oid(priv, TRANSMIT_CHL, id);
+	}
+
+	bfin_can_write_data(priv, TRANSMIT_CHL, cf->data, dlc);
+
+	bfin_can_write_dlc(priv, TRANSMIT_CHL, dlc);
+
+	dev->trans_start = jiffies;
+
+	can_put_echo_skb(skb, dev, 0);
+
+	/* set transmit request */
+	writew(BIT(TRANSMIT_CHL - 16), &reg->trs2);
+	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 *reg = priv->membase;
+	struct can_frame *cf;
+	struct sk_buff *skb;
+	canid_t id;
+	u8 dlc;
+	int obj;
+
+	skb = alloc_can_skb(dev, &cf);
+	if (skb == NULL)
+		return;
+
+	/* get id and data length code */
+	if (isrc & BIT(RECEIVE_EXT_CHL)) {
+		/* extended frame format (EFF) */
+		id = bfin_can_read_xoid(priv, RECEIVE_EXT_CHL);
+		id |= CAN_EFF_FLAG;
+		obj = RECEIVE_EXT_CHL;
+	} else {
+		/* standard frame format (SFF) */
+		id = bfin_can_read_oid(priv, RECEIVE_STD_CHL);
+		obj = RECEIVE_STD_CHL;
+	}
+	if (readw(&reg->chl[obj].id1) & RTR)
+		id |= CAN_RTR_FLAG;
+	dlc = bfin_can_read_dlc(priv, obj);
+
+	cf->can_id = id;
+	cf->can_dlc = dlc;
+
+	bfin_can_read_data(priv, obj, cf->data, dlc);
+
+	netif_rx(skb);
+
+	stats->rx_packets++;
+	stats->rx_bytes += 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 *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 = readw(&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 *reg = priv->membase;
+	struct net_device_stats *stats = &dev->stats;
+	u16 status, isrc;
+
+	if ((irq == priv->tx_irq) && readw(&reg->mbtif2)) {
+		/* transmission complete interrupt */
+		writew(0xFFFF, &reg->mbtif2);
+		stats->tx_packets++;
+		stats->tx_bytes += bfin_can_read_dlc(priv, TRANSMIT_CHL);
+		can_get_echo_skb(dev, 0);
+		netif_wake_queue(dev);
+	} else if ((irq == priv->rx_irq) && readw(&reg->mbrif1)) {
+		/* receive interrupt */
+		isrc = readw(&reg->mbrif1);
+		writew(0xFFFF, &reg->mbrif1);
+		bfin_can_rx(dev, isrc);
+	} else if ((irq == priv->err_irq) && readw(&reg->gis)) {
+		/* error interrupt */
+		isrc = readw(&reg->gis);
+		status = readw(&reg->esr);
+		writew(0x7FF, &reg->gis);
+		bfin_can_err(dev, isrc, status);
+	} else
+		return IRQ_NONE;
+
+	return IRQ_HANDLED;
+}
+
+static int bfin_can_open(struct net_device *dev)
+{
+	int err;
+
+	/* set chip into reset mode */
+	bfin_can_set_reset_mode(dev);
+
+	/* common open */
+	err = open_candev(dev);
+	if (err)
+		return err;
+
+	/* init and start chi */
+	bfin_can_start(dev);
+
+	netif_start_queue(dev);
+
+	return 0;
+}
+
+static int bfin_can_close(struct net_device *dev)
+{
+	netif_stop_queue(dev);
+	bfin_can_set_reset_mode(dev);
+
+	close_candev(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;
+	}
+
+	/* register interrupt handler */
+	err = request_irq(rx_irq->start, &bfin_can_interrupt, 0,
+			"bfin-can-rx", (void *)dev);
+	if (err)
+		goto exit_candev_free;
+	err = request_irq(tx_irq->start, &bfin_can_interrupt, 0,
+			"bfin-can-tx", (void *)dev);
+	if (err)
+		goto exit_rx_irq_free;
+	err = request_irq(err_irq->start, &bfin_can_interrupt, 0,
+			"bfin-can-err", (void *)dev);
+	if (err)
+		goto exit_tx_irq_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_err_irq_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_err_irq_free:
+	free_irq(err_irq->start, dev);
+exit_tx_irq_free:
+	free_irq(tx_irq->start, dev);
+exit_rx_irq_free:
+	free_irq(rx_irq->start, dev);
+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));
+
+	free_irq(priv->rx_irq, dev);
+	free_irq(priv->tx_irq, dev);
+	free_irq(priv->err_irq, dev);
+	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 *reg = priv->membase;
+	int timeout = BFIN_CAN_TIMEOUT;
+
+	if (netif_running(dev)) {
+		/* enter sleep mode */
+		writew(readw(&reg->ctrl) | SMR, &reg->ctrl);
+		SSYNC();
+		while (!(readw(&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 *reg = priv->membase;
+
+	if (netif_running(dev)) {
+		/* leave sleep mode */
+		writew(0, &reg->intr);
+		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@...il.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Blackfin on-chip CAN netdevice driver");
-- 
1.5.6.3

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