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Commit bbb84619 authored by Barry Song's avatar Barry Song Committed by David S. Miller
Browse files

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



Signed-off-by: default avatarBarry Song <21cnbao@gmail.com>
Signed-off-by: default avatarH.J. Oertel <oe@port.de>
Signed-off-by: default avatarWolfgang Grandegger <wg@grandegger.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c20a66f4

drivers/net/can/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -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"

drivers/net/can/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/net/can/bfin_can.c

0 → 100644
+783 −0
Original line number Diff line number Diff line 
/*

 * 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");