Message-ID: <1260353277-30902-1-git-send-email-21cnbao@gmail.com>
Date:	Wed, 9 Dec 2009 18:07:57 +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 v2] 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>
---
	-v2: cleanup according to Wolfgang Grandegger's feedback
	1.delete some unnecessary debug print
	2.delete ndo_tx_timeout entry as it is not needed in can 
	3.use alloc_can_skb, alloc_can_err_skb instead of netdev_alloc_skb
	4.add timeout while polling can status
	5.rename BFIN_CAN_READ/WRITE_MSG to bfin_can_read/write_data
	6.use kernel BIT instead of bit shift
	7.use void __iomem * for CAN memory base memory instead of u32
	8.delete "dev->last_rx = jiffies" since it is not needed now
	9.delete redundant "echo_skb" member in bfin can private data
	10.follow can convention to use "_" instead of "-" for file names

 drivers/net/can/Kconfig    |    9 +
 drivers/net/can/Makefile   |    1 +
 drivers/net/can/bfin_can.c |  786 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 796 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..36a9f8c
--- /dev/null
+++ b/drivers/net/can/bfin_can.c
@@ -0,0 +1,786 @@
+/*
+ * 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
+
+/*
+ * registers offset
+ */
+#define OFFSET_MB_MASK              0x100
+#define OFFSET_MASK_AML             0x0
+#define OFFSET_MASK_AMH             0x4
+#define OFFSET_MB_OBJ               0x200
+#define OFFSET_OBJ_DATA             0x0
+#define OFFSET_OBJ_DLC              0x10
+#define OFFSET_OBJ_ID0              0x18
+#define OFFSET_OBJ_ID1              0x1C
+#define OFFSET_CLOCK                0x80
+#define OFFSET_TIMING               0x84
+#define OFFSET_STATUS               0x8C
+#define OFFSET_CEC                  0x90
+#define OFFSET_GIS                  0x94
+#define OFFSET_GIM                  0x98
+#define OFFSET_CONTROL              0xA0
+#define OFFSET_INTR                 0xA4
+#define OFFSET_ESR                  0xB4
+#define OFFSET_MBIM1                0x28
+#define OFFSET_MBIM2                0x68
+#define OFFSET_MC1                  0x0
+#define OFFSET_MC2                  0x40
+#define OFFSET_MD1                  0x4
+#define OFFSET_MD2                  0x44
+#define OFFSET_TRS2                 0x48
+#define OFFSET_MBTIF1               0x20
+#define OFFSET_MBTIF2               0x60
+#define OFFSET_MBRIF1               0x24
+#define OFFSET_MBRIF2               0x64
+
+/*
+ * 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
+
+/*
+ * 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;
+};
+
+/*
+ * read/write CAN registers and messages
+ */
+#define can_membase(priv)  \
+	((priv)->membase)
+#define can_channel_membase(priv, channel) \
+	((priv)->membase + OFFSET_MB_OBJ + ((channel) << 5))
+#define can_mask_membase(priv, channel)  \
+	((priv)->membase + OFFSET_MB_MASK + ((channel) << 3))
+
+#define CAN_WRITE_REG(val, addr) \
+	writew((val), (addr))
+
+#define CAN_READ_REG(addr) \
+	readw((addr))
+
+#define CAN_WRITE_CTRL(priv, off, val) \
+	CAN_WRITE_REG(val, can_membase((priv)) + (off))
+
+#define CAN_READ_CTRL(priv, off) \
+	CAN_READ_REG(can_membase((priv)) + (off))
+
+#define CAN_WRITE_AML(priv, channel, aml) \
+	(CAN_WRITE_REG((aml), can_mask_membase(priv, channel) + OFFSET_MASK_AML))
+
+#define CAN_WRITE_AMH(priv, channel, amh) \
+	(CAN_WRITE_REG((amh), can_mask_membase(priv, channel) + OFFSET_MASK_AMH))
+
+#define CAN_WRITE_DLC(priv, channel, length) \
+	(CAN_WRITE_REG((length), can_channel_membase(priv, channel) + OFFSET_OBJ_DLC))
+
+#define CAN_READ_DLC(priv, channel) \
+	(CAN_READ_REG(can_channel_membase((priv), (channel)) + OFFSET_OBJ_DLC))
+
+#define CAN_READ_OID(priv, channel) \
+	((CAN_READ_REG(can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID1) & 0x1ffc) >> 2)
+
+#define CAN_READ_XOID(priv, channel) \
+	(((CAN_READ_REG(can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID1) & 0x1fff) << 16) \
+	 + ((CAN_READ_REG(can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID0))))
+
+#define CAN_READ_ID1(priv, channel) \
+	(CAN_READ_REG(can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID1))
+
+#define CAN_WRITE_ID0(priv, channel, val) \
+	CAN_WRITE_REG((val), can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID0)
+
+#define CAN_WRITE_OID(priv, channel, id) \
+	CAN_WRITE_REG(((id) << 2) | AME, can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID1)
+
+#define CAN_WRITE_XOID(priv, channel, id)  \
+	do { \
+		CAN_WRITE_REG((id), can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID0); \
+		CAN_WRITE_REG((((id) & 0x1FFF0000) >> 16) + IDE + AME, \
+				can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID1); \
+	} while (0)
+
+#define CAN_WRITE_OID_RTR(priv, channel, id) \
+	CAN_WRITE_REG(((id) << 2) | RTR | AME, can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID1)
+
+#define CAN_WRITE_XOID_RTR(priv, channel, id)  \
+	do { \
+		CAN_WRITE_REG((id), can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID0); \
+		CAN_WRITE_REG((((id) & 0x1FFF0000) >> 16) + IDE + RTR + AME, \
+				can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID1); \
+	} while (0)
+
+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 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;
+
+	CAN_WRITE_CTRL(priv, OFFSET_CLOCK, clk);
+	CAN_WRITE_CTRL(priv, OFFSET_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);
+	int i;
+	int timeout = BFIN_CAN_TIMEOUT;
+
+	/* disable interrupts */
+	CAN_WRITE_CTRL(priv, OFFSET_MBIM1, 0);
+	CAN_WRITE_CTRL(priv, OFFSET_MBIM2, 0);
+	CAN_WRITE_CTRL(priv, OFFSET_GIM, 0);
+
+	/* reset can and enter configuration mode */
+	CAN_WRITE_CTRL(priv, OFFSET_CONTROL, SRS | CCR);
+	SSYNC();
+	CAN_WRITE_CTRL(priv, OFFSET_CONTROL, CCR);
+	SSYNC();
+	while (!(CAN_READ_CTRL(priv, OFFSET_CONTROL) & 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
+	 */
+	CAN_WRITE_CTRL(priv, OFFSET_MC1, 0);
+	CAN_WRITE_CTRL(priv, OFFSET_MC2, 0);
+
+	/* Set Mailbox Direction */
+	CAN_WRITE_CTRL(priv, OFFSET_MD1, 0xFFFF);  /* mailbox 1-16 are RX */
+	CAN_WRITE_CTRL(priv, OFFSET_MD2, 0);       /* mailbox 17-32 are TX */
+
+	/* RECEIVE_STD_CHL */
+	for (i = 0; i < 2; i++) {
+		CAN_WRITE_OID(priv, RECEIVE_STD_CHL + i, 0);
+		CAN_WRITE_ID0(priv, RECEIVE_STD_CHL, 0);
+		CAN_WRITE_DLC(priv, RECEIVE_STD_CHL + i, 0);
+		CAN_WRITE_AMH(priv, RECEIVE_STD_CHL + i, 0x1FFF);
+		CAN_WRITE_AML(priv, RECEIVE_STD_CHL + i, 0xFFFF);
+	}
+
+	/* RECEIVE_EXT_CHL */
+	for (i = 0; i < 2; i++) {
+		CAN_WRITE_XOID(priv, RECEIVE_EXT_CHL + i, 0);
+		CAN_WRITE_DLC(priv, RECEIVE_EXT_CHL + i, 0);
+		CAN_WRITE_AMH(priv, RECEIVE_EXT_CHL + i, 0x1FFF);
+		CAN_WRITE_AML(priv, RECEIVE_EXT_CHL + i, 0xFFFF);
+	}
+
+	CAN_WRITE_CTRL(priv, OFFSET_MC2, BIT(TRANSMIT_CHL - 16));
+	CAN_WRITE_CTRL(priv, OFFSET_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);
+	int timeout = BFIN_CAN_TIMEOUT;
+
+	/*
+	 * leave configuration mode
+	 */
+	CAN_WRITE_CTRL(priv, OFFSET_CONTROL, CAN_READ_CTRL(priv, OFFSET_CONTROL) & ~CCR);
+
+	while (CAN_READ_CTRL(priv, OFFSET_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
+	 */
+	CAN_WRITE_CTRL(priv, OFFSET_MBTIF1, 0xFFFF);
+	CAN_WRITE_CTRL(priv, OFFSET_MBTIF2, 0xFFFF);
+	CAN_WRITE_CTRL(priv, OFFSET_MBRIF1, 0xFFFF);
+	CAN_WRITE_CTRL(priv, OFFSET_MBRIF2, 0xFFFF);
+
+	/*
+	 * clear global interrupt status register
+	 */
+	CAN_WRITE_CTRL(priv, OFFSET_GIS, 0x7FF); /* overwrites with '1' */
+
+	/*
+	 * Initialize Interrupts
+	 * - set bits in the mailbox interrupt mask register
+	 * - global interrupt mask
+	 */
+	CAN_WRITE_CTRL(priv, OFFSET_MBIM1, BIT(RECEIVE_STD_CHL) + BIT(RECEIVE_EXT_CHL));
+	CAN_WRITE_CTRL(priv, OFFSET_MBIM2, BIT(TRANSMIT_CHL - 16));
+
+	CAN_WRITE_CTRL(priv, OFFSET_GIM, EPIM | BOIM | RMLIM);
+	SSYNC();
+}
+
+static inline void bfin_can_write_data(struct bfin_can_priv *priv, int channel, u8 *data, int dlc)
+{
+	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);
+		CAN_WRITE_REG(val, can_channel_membase((priv), (channel)) + OFFSET_OBJ_DATA + (i << 1));
+	}
+}
+
+static inline void bfin_can_read_data(struct bfin_can_priv *priv, int channel, u8 *data, int dlc)
+{
+	int i;
+	u16 val;
+
+	for (i = 0; i < 8; i += 2) {
+		val = CAN_READ_REG(can_channel_membase((priv), (channel)) + OFFSET_OBJ_DATA + (i << 1));
+		data[7 - i] = (7 - i) < dlc ? val : 0;
+		data[6 - i] = (6 - i) < dlc ? (val >> 8) : 0;
+	}
+}
+
+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 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)
+			CAN_WRITE_XOID_RTR(priv, TRANSMIT_CHL, id);
+		else
+			CAN_WRITE_XOID(priv, TRANSMIT_CHL, id);
+	} else {
+		if (id & CAN_RTR_FLAG)
+			CAN_WRITE_OID_RTR(priv, TRANSMIT_CHL, id);
+		else
+			CAN_WRITE_OID(priv, TRANSMIT_CHL, id);
+	}
+
+	bfin_can_write_data(priv, TRANSMIT_CHL, cf->data, dlc);
+
+	CAN_WRITE_DLC(priv, TRANSMIT_CHL, dlc);
+
+	dev->trans_start = jiffies;
+
+	can_put_echo_skb(skb, dev, 0);
+
+	/* set transmit request */
+	CAN_WRITE_CTRL(priv, OFFSET_TRS2, BIT(TRANSMIT_CHL - 16));
+	return 0;
+}
+
+static void bfin_can_rx(struct net_device *dev, uint16_t isrc)
+{
+	struct bfin_can_priv *priv = netdev_priv(dev);
+	struct net_device_stats *stats = &dev->stats;
+	struct can_frame *cf;
+	struct sk_buff *skb;
+	canid_t id;
+	uint8_t 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 = CAN_READ_XOID(priv, RECEIVE_EXT_CHL);
+		id |= CAN_EFF_FLAG;
+		obj = RECEIVE_EXT_CHL;
+	} else {
+		/* standard frame format (SFF) */
+		id = CAN_READ_OID(priv, RECEIVE_STD_CHL);
+		obj = RECEIVE_STD_CHL;
+	}
+	if (CAN_READ_ID1(priv, obj) & RTR)
+		id |= CAN_RTR_FLAG;
+	dlc = 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, uint16_t isrc, uint16_t status)
+{
+	struct bfin_can_priv *priv = netdev_priv(dev);
+	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)) {
+		uint16_t cec = CAN_READ_CTRL(priv, OFFSET_CEC);
+		uint8_t rxerr = cec;
+		uint8_t 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 net_device_stats *stats = &dev->stats;
+	uint16_t status, isrc;
+
+	if ((irq == priv->tx_irq) && CAN_READ_CTRL(priv, OFFSET_MBTIF2)) {
+		/* transmission complete interrupt */
+		CAN_WRITE_CTRL(priv, OFFSET_MBTIF2, 0xFFFF);
+		stats->tx_packets++;
+		stats->tx_bytes += CAN_READ_DLC(priv, TRANSMIT_CHL);
+		can_get_echo_skb(dev, 0);
+		netif_wake_queue(dev);
+	} else if ((irq == priv->rx_irq) && CAN_READ_CTRL(priv, OFFSET_MBRIF1)) {
+		/* receive interrupt */
+		isrc = CAN_READ_CTRL(priv, OFFSET_MBRIF1);
+		CAN_WRITE_CTRL(priv, OFFSET_MBRIF1, 0xFFFF);
+		bfin_can_rx(dev, isrc);
+	} else if ((irq == priv->err_irq) && CAN_READ_CTRL(priv, OFFSET_GIS)) {
+		/* error interrupt */
+		isrc = CAN_READ_CTRL(priv, OFFSET_GIS);
+		status = CAN_READ_CTRL(priv, OFFSET_ESR);
+		CAN_WRITE_CTRL(priv, OFFSET_GIS, 0x7FF);
+		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);
+	int timeout = BFIN_CAN_TIMEOUT;
+
+	if (netif_running(dev)) {
+		/* enter sleep mode */
+		CAN_WRITE_CTRL(priv, OFFSET_CONTROL,
+			CAN_READ_CTRL(priv, OFFSET_CONTROL) | SMR);
+		SSYNC();
+		while (!(CAN_READ_CTRL(priv, OFFSET_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);
+
+	if (netif_running(dev)) {
+		/* leave sleep mode */
+		CAN_WRITE_CTRL(priv, OFFSET_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@...il.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Blackfin on-chip CAN netdevice driver");
+
-- 
1.5.6.3

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