[net-next-2.6.git] / drivers / net / can / sja1000 / sja1000.c

/*
 * sja1000.c -  Philips SJA1000 network device driver
 *
 * Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
 * 38106 Braunschweig, GERMANY
 *
 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of Volkswagen nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * Alternatively, provided that this notice is retained in full, this
 * software may be distributed under the terms of the GNU General
 * Public License ("GPL") version 2, in which case the provisions of the
 * GPL apply INSTEAD OF those given above.
 *
 * The provided data structures and external interfaces from this code
 * are not restricted to be used by modules with a GPL compatible license.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 * Send feedback to <socketcan-users@lists.berlios.de>
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/delay.h>

#include <linux/can/dev.h>
#include <linux/can/error.h>

#include "sja1000.h"

#define DRV_NAME "sja1000"

MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");

static struct can_bittiming_const sja1000_bittiming_const = {
	.name = DRV_NAME,
	.tseg1_min = 1,
	.tseg1_max = 16,
	.tseg2_min = 1,
	.tseg2_max = 8,
	.sjw_max = 4,
	.brp_min = 1,
	.brp_max = 64,
	.brp_inc = 1,
};

static int sja1000_probe_chip(struct net_device *dev)
{
	struct sja1000_priv *priv = netdev_priv(dev);

	if (priv->reg_base && (priv->read_reg(priv, 0) == 0xFF)) {
		printk(KERN_INFO "%s: probing @0x%lX failed\n",
		       DRV_NAME, dev->base_addr);
		return 0;
	}
	return -1;
}

static void set_reset_mode(struct net_device *dev)
{
	struct sja1000_priv *priv = netdev_priv(dev);
	unsigned char status = priv->read_reg(priv, REG_MOD);
	int i;

	/* disable interrupts */
	priv->write_reg(priv, REG_IER, IRQ_OFF);

	for (i = 0; i < 100; i++) {
		/* check reset bit */
		if (status & MOD_RM) {
			priv->can.state = CAN_STATE_STOPPED;
			return;
		}

		priv->write_reg(priv, REG_MOD, MOD_RM);	/* reset chip */
		udelay(10);
		status = priv->read_reg(priv, REG_MOD);
	}

	dev_err(dev->dev.parent, "setting SJA1000 into reset mode failed!\n");
}

static void set_normal_mode(struct net_device *dev)
{
	struct sja1000_priv *priv = netdev_priv(dev);
	unsigned char status = priv->read_reg(priv, REG_MOD);
	int i;

	for (i = 0; i < 100; i++) {
		/* check reset bit */
		if ((status & MOD_RM) == 0) {
			priv->can.state = CAN_STATE_ERROR_ACTIVE;
			/* enable interrupts */
			if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
				priv->write_reg(priv, REG_IER, IRQ_ALL);
			else
				priv->write_reg(priv, REG_IER,
						IRQ_ALL & ~IRQ_BEI);
			return;
		}

		/* set chip to normal mode */
		priv->write_reg(priv, REG_MOD, 0x00);
		udelay(10);
		status = priv->read_reg(priv, REG_MOD);
	}

	dev_err(dev->dev.parent, "setting SJA1000 into normal mode failed!\n");
}

static void sja1000_start(struct net_device *dev)
{
	struct sja1000_priv *priv = netdev_priv(dev);

	/* leave reset mode */
	if (priv->can.state != CAN_STATE_STOPPED)
		set_reset_mode(dev);

	/* Clear error counters and error code capture */
	priv->write_reg(priv, REG_TXERR, 0x0);
	priv->write_reg(priv, REG_RXERR, 0x0);
	priv->read_reg(priv, REG_ECC);

	/* leave reset mode */
	set_normal_mode(dev);
}

static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
{
	struct sja1000_priv *priv = netdev_priv(dev);

	if (!priv->open_time)
		return -EINVAL;

	switch (mode) {
	case CAN_MODE_START:
		sja1000_start(dev);
		if (netif_queue_stopped(dev))
			netif_wake_queue(dev);
		break;

	default:
		return -EOPNOTSUPP;
	}

	return 0;
}

static int sja1000_set_bittiming(struct net_device *dev)
{
	struct sja1000_priv *priv = netdev_priv(dev);
	struct can_bittiming *bt = &priv->can.bittiming;
	u8 btr0, btr1;

	btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
	btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
		(((bt->phase_seg2 - 1) & 0x7) << 4);
	if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
		btr1 |= 0x80;

	dev_info(dev->dev.parent,
		 "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);

	priv->write_reg(priv, REG_BTR0, btr0);
	priv->write_reg(priv, REG_BTR1, btr1);

	return 0;
}

static int sja1000_get_berr_counter(const struct net_device *dev,
				    struct can_berr_counter *bec)
{
	struct sja1000_priv *priv = netdev_priv(dev);

	bec->txerr = priv->read_reg(priv, REG_TXERR);
	bec->rxerr = priv->read_reg(priv, REG_RXERR);

	return 0;
}

/*
 * initialize SJA1000 chip:
 *   - reset chip
 *   - set output mode
 *   - set baudrate
 *   - enable interrupts
 *   - start operating mode
 */
static void chipset_init(struct net_device *dev)
{
	struct sja1000_priv *priv = netdev_priv(dev);

	/* set clock divider and output control register */
	priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN);

	/* set acceptance filter (accept all) */
	priv->write_reg(priv, REG_ACCC0, 0x00);
	priv->write_reg(priv, REG_ACCC1, 0x00);
	priv->write_reg(priv, REG_ACCC2, 0x00);
	priv->write_reg(priv, REG_ACCC3, 0x00);

	priv->write_reg(priv, REG_ACCM0, 0xFF);
	priv->write_reg(priv, REG_ACCM1, 0xFF);
	priv->write_reg(priv, REG_ACCM2, 0xFF);
	priv->write_reg(priv, REG_ACCM3, 0xFF);

	priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL);
}

/*
 * transmit a CAN message
 * message layout in the sk_buff should be like this:
 * xx xx xx xx	 ff	 ll   00 11 22 33 44 55 66 77
 * [  can-id ] [flags] [len] [can data (up to 8 bytes]
 */
static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
					    struct net_device *dev)
{
	struct sja1000_priv *priv = netdev_priv(dev);
	struct can_frame *cf = (struct can_frame *)skb->data;
	uint8_t fi;
	uint8_t dlc;
	canid_t id;
	uint8_t dreg;
	int i;

	if (can_dropped_invalid_skb(dev, skb))
		return NETDEV_TX_OK;

	netif_stop_queue(dev);

	fi = dlc = cf->can_dlc;
	id = cf->can_id;

	if (id & CAN_RTR_FLAG)
		fi |= FI_RTR;

	if (id & CAN_EFF_FLAG) {
		fi |= FI_FF;
		dreg = EFF_BUF;
		priv->write_reg(priv, REG_FI, fi);
		priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
		priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
		priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
		priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
	} else {
		dreg = SFF_BUF;
		priv->write_reg(priv, REG_FI, fi);
		priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
		priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
	}

	for (i = 0; i < dlc; i++)
		priv->write_reg(priv, dreg++, cf->data[i]);

	can_put_echo_skb(skb, dev, 0);

	priv->write_reg(priv, REG_CMR, CMD_TR);

	return NETDEV_TX_OK;
}

static void sja1000_rx(struct net_device *dev)
{
	struct sja1000_priv *priv = netdev_priv(dev);
	struct net_device_stats *stats = &dev->stats;
	struct can_frame *cf;
	struct sk_buff *skb;
	uint8_t fi;
	uint8_t dreg;
	canid_t id;
	int i;

	/* create zero'ed CAN frame buffer */
	skb = alloc_can_skb(dev, &cf);
	if (skb == NULL)
		return;

	fi = priv->read_reg(priv, REG_FI);

	if (fi & FI_FF) {
		/* extended frame format (EFF) */
		dreg = EFF_BUF;
		id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
		    | (priv->read_reg(priv, REG_ID2) << (5 + 8))
		    | (priv->read_reg(priv, REG_ID3) << 5)
		    | (priv->read_reg(priv, REG_ID4) >> 3);
		id |= CAN_EFF_FLAG;
	} else {
		/* standard frame format (SFF) */
		dreg = SFF_BUF;
		id = (priv->read_reg(priv, REG_ID1) << 3)
		    | (priv->read_reg(priv, REG_ID2) >> 5);
	}

	if (fi & FI_RTR) {
		id |= CAN_RTR_FLAG;
	} else {
		cf->can_dlc = get_can_dlc(fi & 0x0F);
		for (i = 0; i < cf->can_dlc; i++)
			cf->data[i] = priv->read_reg(priv, dreg++);
	}

	cf->can_id = id;

	/* release receive buffer */
	priv->write_reg(priv, REG_CMR, CMD_RRB);

	netif_rx(skb);

	stats->rx_packets++;
	stats->rx_bytes += cf->can_dlc;
}

static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
{
	struct sja1000_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;
	uint8_t ecc, alc;

	skb = alloc_can_err_skb(dev, &cf);
	if (skb == NULL)
		return -ENOMEM;

	if (isrc & IRQ_DOI) {
		/* 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++;
		priv->write_reg(priv, REG_CMR, CMD_CDO);	/* clear bit */
	}

	if (isrc & IRQ_EI) {
		/* error warning interrupt */
		dev_dbg(dev->dev.parent, "error warning interrupt\n");

		if (status & SR_BS) {
			state = CAN_STATE_BUS_OFF;
			cf->can_id |= CAN_ERR_BUSOFF;
			can_bus_off(dev);
		} else if (status & SR_ES) {
			state = CAN_STATE_ERROR_WARNING;
		} else
			state = CAN_STATE_ERROR_ACTIVE;
	}
	if (isrc & IRQ_BEI) {
		/* bus error interrupt */
		priv->can.can_stats.bus_error++;
		stats->rx_errors++;

		ecc = priv->read_reg(priv, REG_ECC);

		cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;

		switch (ecc & ECC_MASK) {
		case ECC_BIT:
			cf->data[2] |= CAN_ERR_PROT_BIT;
			break;
		case ECC_FORM:
			cf->data[2] |= CAN_ERR_PROT_FORM;
			break;
		case ECC_STUFF:
			cf->data[2] |= CAN_ERR_PROT_STUFF;
			break;
		default:
			cf->data[2] |= CAN_ERR_PROT_UNSPEC;
			cf->data[3] = ecc & ECC_SEG;
			break;
		}
		/* Error occured during transmission? */
		if ((ecc & ECC_DIR) == 0)
			cf->data[2] |= CAN_ERR_PROT_TX;
	}
	if (isrc & IRQ_EPI) {
		/* error passive interrupt */
		dev_dbg(dev->dev.parent, "error passive interrupt\n");
		if (status & SR_ES)
			state = CAN_STATE_ERROR_PASSIVE;
		else
			state = CAN_STATE_ERROR_ACTIVE;
	}
	if (isrc & IRQ_ALI) {
		/* arbitration lost interrupt */
		dev_dbg(dev->dev.parent, "arbitration lost interrupt\n");
		alc = priv->read_reg(priv, REG_ALC);
		priv->can.can_stats.arbitration_lost++;
		stats->tx_errors++;
		cf->can_id |= CAN_ERR_LOSTARB;
		cf->data[0] = alc & 0x1f;
	}

	if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
					 state == CAN_STATE_ERROR_PASSIVE)) {
		uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
		uint8_t txerr = priv->read_reg(priv, REG_TXERR);
		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;
		}
		cf->data[6] = txerr;
		cf->data[7] = rxerr;
	}

	priv->can.state = state;

	netif_rx(skb);

	stats->rx_packets++;
	stats->rx_bytes += cf->can_dlc;

	return 0;
}

irqreturn_t sja1000_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = (struct net_device *)dev_id;
	struct sja1000_priv *priv = netdev_priv(dev);
	struct net_device_stats *stats = &dev->stats;
	uint8_t isrc, status;
	int n = 0;

	/* Shared interrupts and IRQ off? */
	if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
		return IRQ_NONE;

	if (priv->pre_irq)
		priv->pre_irq(priv);

	while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
		n++;
		status = priv->read_reg(priv, REG_SR);

		if (isrc & IRQ_WUI)
			dev_warn(dev->dev.parent, "wakeup interrupt\n");

		if (isrc & IRQ_TI) {
			/* transmission complete interrupt */
			stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf;
			stats->tx_packets++;
			can_get_echo_skb(dev, 0);
			netif_wake_queue(dev);
		}
		if (isrc & IRQ_RI) {
			/* receive interrupt */
			while (status & SR_RBS) {
				sja1000_rx(dev);
				status = priv->read_reg(priv, REG_SR);
			}
		}
		if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
			/* error interrupt */
			if (sja1000_err(dev, isrc, status))
				break;
		}
	}

	if (priv->post_irq)
		priv->post_irq(priv);

	if (n >= SJA1000_MAX_IRQ)
		dev_dbg(dev->dev.parent, "%d messages handled in ISR", n);

	return (n) ? IRQ_HANDLED : IRQ_NONE;
}
EXPORT_SYMBOL_GPL(sja1000_interrupt);

static int sja1000_open(struct net_device *dev)
{
	struct sja1000_priv *priv = netdev_priv(dev);
	int err;

	/* set chip into reset mode */
	set_reset_mode(dev);

	/* common open */
	err = open_candev(dev);
	if (err)
		return err;

	/* register interrupt handler, if not done by the device driver */
	if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
		err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
				  dev->name, (void *)dev);
		if (err) {
			close_candev(dev);
			return -EAGAIN;
		}
	}

	/* init and start chi */
	sja1000_start(dev);
	priv->open_time = jiffies;

	netif_start_queue(dev);

	return 0;
}

static int sja1000_close(struct net_device *dev)
{
	struct sja1000_priv *priv = netdev_priv(dev);

	netif_stop_queue(dev);
	set_reset_mode(dev);

	if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
		free_irq(dev->irq, (void *)dev);

	close_candev(dev);

	priv->open_time = 0;

	return 0;
}

struct net_device *alloc_sja1000dev(int sizeof_priv)
{
	struct net_device *dev;
	struct sja1000_priv *priv;

	dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
		SJA1000_ECHO_SKB_MAX);
	if (!dev)
		return NULL;

	priv = netdev_priv(dev);

	priv->dev = dev;
	priv->can.bittiming_const = &sja1000_bittiming_const;
	priv->can.do_set_bittiming = sja1000_set_bittiming;
	priv->can.do_set_mode = sja1000_set_mode;
	priv->can.do_get_berr_counter = sja1000_get_berr_counter;
	priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
		CAN_CTRLMODE_BERR_REPORTING;

	if (sizeof_priv)
		priv->priv = (void *)priv + sizeof(struct sja1000_priv);

	return dev;
}
EXPORT_SYMBOL_GPL(alloc_sja1000dev);

void free_sja1000dev(struct net_device *dev)
{
	free_candev(dev);
}
EXPORT_SYMBOL_GPL(free_sja1000dev);

static const struct net_device_ops sja1000_netdev_ops = {
       .ndo_open               = sja1000_open,
       .ndo_stop               = sja1000_close,
       .ndo_start_xmit         = sja1000_start_xmit,
};

int register_sja1000dev(struct net_device *dev)
{
	if (!sja1000_probe_chip(dev))
		return -ENODEV;

	dev->flags |= IFF_ECHO;	/* we support local echo */
	dev->netdev_ops = &sja1000_netdev_ops;

	set_reset_mode(dev);
	chipset_init(dev);

	return register_candev(dev);
}
EXPORT_SYMBOL_GPL(register_sja1000dev);

void unregister_sja1000dev(struct net_device *dev)
{
	set_reset_mode(dev);
	unregister_candev(dev);
}
EXPORT_SYMBOL_GPL(unregister_sja1000dev);

static __init int sja1000_init(void)
{
	printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);

	return 0;
}

module_init(sja1000_init);

static __exit void sja1000_exit(void)
{
	printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
}

module_exit(sja1000_exit);
Commit	Line	Data
429da1cc WG	1	/*
	2	* sja1000.c - Philips SJA1000 network device driver
	3	*
	4	* Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
	5	* 38106 Braunschweig, GERMANY
	6	*
	7	* Copyright (c) 2002-2007 Volkswagen Group Electronic Research
	8	* All rights reserved.
	9	*
	10	* Redistribution and use in source and binary forms, with or without
	11	* modification, are permitted provided that the following conditions
	12	* are met:
	13	* 1. Redistributions of source code must retain the above copyright
	14	* notice, this list of conditions and the following disclaimer.
	15	* 2. Redistributions in binary form must reproduce the above copyright
	16	* notice, this list of conditions and the following disclaimer in the
	17	* documentation and/or other materials provided with the distribution.
	18	* 3. Neither the name of Volkswagen nor the names of its contributors
	19	* may be used to endorse or promote products derived from this software
	20	* without specific prior written permission.
	21	*
	22	* Alternatively, provided that this notice is retained in full, this
	23	* software may be distributed under the terms of the GNU General
	24	* Public License ("GPL") version 2, in which case the provisions of the
	25	* GPL apply INSTEAD OF those given above.
	26	*
	27	* The provided data structures and external interfaces from this code
	28	* are not restricted to be used by modules with a GPL compatible license.
	29	*
	30	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	31	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	32	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	33	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	34	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	35	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	36	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	37	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	38	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	39	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	40	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
	41	* DAMAGE.
	42	*
	43	* Send feedback to <socketcan-users@lists.berlios.de>
	44	*
	45	*/
	46
	47	#include <linux/module.h>
	48	#include <linux/init.h>
	49	#include <linux/kernel.h>
	50	#include <linux/sched.h>
	51	#include <linux/types.h>
	52	#include <linux/fcntl.h>
	53	#include <linux/interrupt.h>
	54	#include <linux/ptrace.h>
	55	#include <linux/string.h>
	56	#include <linux/errno.h>
	57	#include <linux/netdevice.h>
	58	#include <linux/if_arp.h>
	59	#include <linux/if_ether.h>
	60	#include <linux/skbuff.h>
	61	#include <linux/delay.h>
	62
429da1cc WG	63	#include <linux/can/dev.h>
429da1cc WG	64	#include <linux/can/error.h>
429da1cc WG	65
	66	#include "sja1000.h"
	67
	68	#define DRV_NAME "sja1000"
	69
	70	MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
	71	MODULE_LICENSE("Dual BSD/GPL");
	72	MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
	73
	74	static struct can_bittiming_const sja1000_bittiming_const = {
	75	.name = DRV_NAME,
	76	.tseg1_min = 1,
	77	.tseg1_max = 16,
	78	.tseg2_min = 1,
	79	.tseg2_max = 8,
	80	.sjw_max = 4,
	81	.brp_min = 1,
	82	.brp_max = 64,
	83	.brp_inc = 1,
	84	};
	85
	86	static int sja1000_probe_chip(struct net_device *dev)
	87	{
	88	struct sja1000_priv *priv = netdev_priv(dev);
	89
255a9154	90	if (priv->reg_base && (priv->read_reg(priv, 0) == 0xFF)) {
429da1cc WG	91	printk(KERN_INFO "%s: probing @0x%lX failed\n",
	92	DRV_NAME, dev->base_addr);
	93	return 0;
	94	}
	95	return -1;
	96	}
	97
	98	static void set_reset_mode(struct net_device *dev)
	99	{
	100	struct sja1000_priv *priv = netdev_priv(dev);
255a9154	101	unsigned char status = priv->read_reg(priv, REG_MOD);
429da1cc WG	102	int i;
	103
	104	/* disable interrupts */
255a9154	105	priv->write_reg(priv, REG_IER, IRQ_OFF);
429da1cc WG	106
	107	for (i = 0; i < 100; i++) {
	108	/* check reset bit */
	109	if (status & MOD_RM) {
	110	priv->can.state = CAN_STATE_STOPPED;
	111	return;
	112	}
	113
255a9154	114	priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */
429da1cc	115	udelay(10);
255a9154	116	status = priv->read_reg(priv, REG_MOD);
429da1cc WG	117	}
	118
	119	dev_err(dev->dev.parent, "setting SJA1000 into reset mode failed!\n");
	120	}
	121
	122	static void set_normal_mode(struct net_device *dev)
	123	{
	124	struct sja1000_priv *priv = netdev_priv(dev);
255a9154	125	unsigned char status = priv->read_reg(priv, REG_MOD);
429da1cc WG	126	int i;
	127
	128	for (i = 0; i < 100; i++) {
	129	/* check reset bit */
	130	if ((status & MOD_RM) == 0) {
	131	priv->can.state = CAN_STATE_ERROR_ACTIVE;
52c793f2 WG	132	/* enable interrupts */
	133	if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
	134	priv->write_reg(priv, REG_IER, IRQ_ALL);
	135	else
	136	priv->write_reg(priv, REG_IER,
	137	IRQ_ALL & ~IRQ_BEI);
429da1cc WG	138	return;
	139	}
	140
	141	/* set chip to normal mode */
255a9154	142	priv->write_reg(priv, REG_MOD, 0x00);
429da1cc	143	udelay(10);
255a9154	144	status = priv->read_reg(priv, REG_MOD);
429da1cc WG	145	}
	146
	147	dev_err(dev->dev.parent, "setting SJA1000 into normal mode failed!\n");
	148	}
	149
	150	static void sja1000_start(struct net_device *dev)
	151	{
	152	struct sja1000_priv *priv = netdev_priv(dev);
	153
	154	/* leave reset mode */
	155	if (priv->can.state != CAN_STATE_STOPPED)
	156	set_reset_mode(dev);
	157
	158	/* Clear error counters and error code capture */
255a9154 WG	159	priv->write_reg(priv, REG_TXERR, 0x0);
	160	priv->write_reg(priv, REG_RXERR, 0x0);
	161	priv->read_reg(priv, REG_ECC);
429da1cc WG	162
	163	/* leave reset mode */
	164	set_normal_mode(dev);
	165	}
	166
	167	static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
	168	{
	169	struct sja1000_priv *priv = netdev_priv(dev);
	170
	171	if (!priv->open_time)
	172	return -EINVAL;
	173
	174	switch (mode) {
	175	case CAN_MODE_START:
	176	sja1000_start(dev);
	177	if (netif_queue_stopped(dev))
	178	netif_wake_queue(dev);
	179	break;
	180
	181	default:
	182	return -EOPNOTSUPP;
	183	}
	184
	185	return 0;
	186	}
	187
	188	static int sja1000_set_bittiming(struct net_device *dev)
	189	{
	190	struct sja1000_priv *priv = netdev_priv(dev);
	191	struct can_bittiming *bt = &priv->can.bittiming;
	192	u8 btr0, btr1;
	193
	194	btr0 = ((bt->brp - 1) & 0x3f) \| (((bt->sjw - 1) & 0x3) << 6);
	195	btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) \|
	196	(((bt->phase_seg2 - 1) & 0x7) << 4);
	197	if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
	198	btr1 \|= 0x80;
	199
	200	dev_info(dev->dev.parent,
	201	"setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
	202
255a9154 WG	203	priv->write_reg(priv, REG_BTR0, btr0);
255a9154 WG	204	priv->write_reg(priv, REG_BTR1, btr1);
429da1cc WG	205
	206	return 0;
	207	}
	208
52c793f2 WG	209	static int sja1000_get_berr_counter(const struct net_device *dev,
	210	struct can_berr_counter *bec)
	211	{
	212	struct sja1000_priv *priv = netdev_priv(dev);
	213
	214	bec->txerr = priv->read_reg(priv, REG_TXERR);
	215	bec->rxerr = priv->read_reg(priv, REG_RXERR);
	216
	217	return 0;
	218	}
	219
429da1cc WG	220	/*
	221	* initialize SJA1000 chip:
	222	* - reset chip
	223	* - set output mode
	224	* - set baudrate
	225	* - enable interrupts
	226	* - start operating mode
	227	*/
	228	static void chipset_init(struct net_device *dev)
	229	{
	230	struct sja1000_priv *priv = netdev_priv(dev);
	231
	232	/* set clock divider and output control register */
255a9154	233	priv->write_reg(priv, REG_CDR, priv->cdr \| CDR_PELICAN);
429da1cc WG	234
429da1cc WG	235	/* set acceptance filter (accept all) */
255a9154 WG	236	priv->write_reg(priv, REG_ACCC0, 0x00);
	237	priv->write_reg(priv, REG_ACCC1, 0x00);
	238	priv->write_reg(priv, REG_ACCC2, 0x00);
	239	priv->write_reg(priv, REG_ACCC3, 0x00);
429da1cc	240
255a9154 WG	241	priv->write_reg(priv, REG_ACCM0, 0xFF);
	242	priv->write_reg(priv, REG_ACCM1, 0xFF);
	243	priv->write_reg(priv, REG_ACCM2, 0xFF);
	244	priv->write_reg(priv, REG_ACCM3, 0xFF);
429da1cc	245
255a9154	246	priv->write_reg(priv, REG_OCR, priv->ocr \| OCR_MODE_NORMAL);
429da1cc WG	247	}
	248
	249	/*
	250	* transmit a CAN message
	251	* message layout in the sk_buff should be like this:
	252	* xx xx xx xx ff ll 00 11 22 33 44 55 66 77
	253	* [ can-id ] [flags] [len] [can data (up to 8 bytes]
	254	*/
61357325 SH	255	static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
61357325 SH	256	struct net_device *dev)
429da1cc WG	257	{
429da1cc WG	258	struct sja1000_priv *priv = netdev_priv(dev);
429da1cc WG	259	struct can_frame cf = (struct can_frame )skb->data;
	260	uint8_t fi;
	261	uint8_t dlc;
	262	canid_t id;
	263	uint8_t dreg;
	264	int i;
	265
3ccd4c61 OH	266	if (can_dropped_invalid_skb(dev, skb))
	267	return NETDEV_TX_OK;
	268
429da1cc WG	269	netif_stop_queue(dev);
	270
	271	fi = dlc = cf->can_dlc;
	272	id = cf->can_id;
	273
	274	if (id & CAN_RTR_FLAG)
	275	fi \|= FI_RTR;
	276
	277	if (id & CAN_EFF_FLAG) {
	278	fi \|= FI_FF;
	279	dreg = EFF_BUF;
255a9154 WG	280	priv->write_reg(priv, REG_FI, fi);
	281	priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
	282	priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
	283	priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
	284	priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
429da1cc WG	285	} else {
429da1cc WG	286	dreg = SFF_BUF;
255a9154 WG	287	priv->write_reg(priv, REG_FI, fi);
	288	priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
	289	priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
429da1cc WG	290	}
	291
	292	for (i = 0; i < dlc; i++)
255a9154	293	priv->write_reg(priv, dreg++, cf->data[i]);
429da1cc	294
429da1cc WG	295	can_put_echo_skb(skb, dev, 0);
429da1cc WG	296
255a9154	297	priv->write_reg(priv, REG_CMR, CMD_TR);
429da1cc	298
6ed10654	299	return NETDEV_TX_OK;
429da1cc WG	300	}
	301
	302	static void sja1000_rx(struct net_device *dev)
	303	{
	304	struct sja1000_priv *priv = netdev_priv(dev);
	305	struct net_device_stats *stats = &dev->stats;
	306	struct can_frame *cf;
	307	struct sk_buff *skb;
	308	uint8_t fi;
	309	uint8_t dreg;
	310	canid_t id;
429da1cc WG	311	int i;
429da1cc WG	312
c7cd606f	313	/* create zero'ed CAN frame buffer */
7b6856a0	314	skb = alloc_can_skb(dev, &cf);
429da1cc WG	315	if (skb == NULL)
429da1cc WG	316	return;
429da1cc	317
255a9154	318	fi = priv->read_reg(priv, REG_FI);
429da1cc WG	319
	320	if (fi & FI_FF) {
	321	/* extended frame format (EFF) */
	322	dreg = EFF_BUF;
255a9154 WG	323	id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
	324	\| (priv->read_reg(priv, REG_ID2) << (5 + 8))
	325	\| (priv->read_reg(priv, REG_ID3) << 5)
	326	\| (priv->read_reg(priv, REG_ID4) >> 3);
429da1cc WG	327	id \|= CAN_EFF_FLAG;
	328	} else {
	329	/* standard frame format (SFF) */
	330	dreg = SFF_BUF;
255a9154 WG	331	id = (priv->read_reg(priv, REG_ID1) << 3)
255a9154 WG	332	\| (priv->read_reg(priv, REG_ID2) >> 5);
429da1cc WG	333	}
429da1cc WG	334
c7cd606f	335	if (fi & FI_RTR) {
429da1cc	336	id \|= CAN_RTR_FLAG;
c7cd606f OH	337	} else {
	338	cf->can_dlc = get_can_dlc(fi & 0x0F);
	339	for (i = 0; i < cf->can_dlc; i++)
	340	cf->data[i] = priv->read_reg(priv, dreg++);
	341	}
429da1cc	342
429da1cc	343	cf->can_id = id;
429da1cc WG	344
429da1cc WG	345	/* release receive buffer */
255a9154	346	priv->write_reg(priv, REG_CMR, CMD_RRB);
429da1cc WG	347
	348	netif_rx(skb);
	349
429da1cc	350	stats->rx_packets++;
c7cd606f	351	stats->rx_bytes += cf->can_dlc;
429da1cc WG	352	}
	353
	354	static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
	355	{
	356	struct sja1000_priv *priv = netdev_priv(dev);
	357	struct net_device_stats *stats = &dev->stats;
	358	struct can_frame *cf;
	359	struct sk_buff *skb;
	360	enum can_state state = priv->can.state;
	361	uint8_t ecc, alc;
	362
7b6856a0	363	skb = alloc_can_err_skb(dev, &cf);
429da1cc WG	364	if (skb == NULL)
429da1cc WG	365	return -ENOMEM;
429da1cc WG	366
	367	if (isrc & IRQ_DOI) {
	368	/* data overrun interrupt */
	369	dev_dbg(dev->dev.parent, "data overrun interrupt\n");
	370	cf->can_id \|= CAN_ERR_CRTL;
	371	cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
	372	stats->rx_over_errors++;
	373	stats->rx_errors++;
255a9154	374	priv->write_reg(priv, REG_CMR, CMD_CDO); /* clear bit */
429da1cc WG	375	}
	376
	377	if (isrc & IRQ_EI) {
	378	/* error warning interrupt */
	379	dev_dbg(dev->dev.parent, "error warning interrupt\n");
	380
	381	if (status & SR_BS) {
	382	state = CAN_STATE_BUS_OFF;
	383	cf->can_id \|= CAN_ERR_BUSOFF;
	384	can_bus_off(dev);
	385	} else if (status & SR_ES) {
	386	state = CAN_STATE_ERROR_WARNING;
	387	} else
	388	state = CAN_STATE_ERROR_ACTIVE;
	389	}
	390	if (isrc & IRQ_BEI) {
	391	/* bus error interrupt */
	392	priv->can.can_stats.bus_error++;
	393	stats->rx_errors++;
	394
255a9154	395	ecc = priv->read_reg(priv, REG_ECC);
429da1cc WG	396
	397	cf->can_id \|= CAN_ERR_PROT \| CAN_ERR_BUSERROR;
	398
	399	switch (ecc & ECC_MASK) {
	400	case ECC_BIT:
	401	cf->data[2] \|= CAN_ERR_PROT_BIT;
	402	break;
	403	case ECC_FORM:
	404	cf->data[2] \|= CAN_ERR_PROT_FORM;
	405	break;
	406	case ECC_STUFF:
	407	cf->data[2] \|= CAN_ERR_PROT_STUFF;
	408	break;
	409	default:
	410	cf->data[2] \|= CAN_ERR_PROT_UNSPEC;
	411	cf->data[3] = ecc & ECC_SEG;
	412	break;
	413	}
	414	/* Error occured during transmission? */
	415	if ((ecc & ECC_DIR) == 0)
	416	cf->data[2] \|= CAN_ERR_PROT_TX;
	417	}
	418	if (isrc & IRQ_EPI) {
	419	/* error passive interrupt */
	420	dev_dbg(dev->dev.parent, "error passive interrupt\n");
	421	if (status & SR_ES)
	422	state = CAN_STATE_ERROR_PASSIVE;
	423	else
	424	state = CAN_STATE_ERROR_ACTIVE;
	425	}
	426	if (isrc & IRQ_ALI) {
	427	/* arbitration lost interrupt */
	428	dev_dbg(dev->dev.parent, "arbitration lost interrupt\n");
255a9154	429	alc = priv->read_reg(priv, REG_ALC);
429da1cc	430	priv->can.can_stats.arbitration_lost++;
8935f57e	431	stats->tx_errors++;
429da1cc WG	432	cf->can_id \|= CAN_ERR_LOSTARB;
	433	cf->data[0] = alc & 0x1f;
	434	}
	435
	436	if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING \|\|
	437	state == CAN_STATE_ERROR_PASSIVE)) {
255a9154 WG	438	uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
255a9154 WG	439	uint8_t txerr = priv->read_reg(priv, REG_TXERR);
429da1cc WG	440	cf->can_id \|= CAN_ERR_CRTL;
	441	if (state == CAN_STATE_ERROR_WARNING) {
	442	priv->can.can_stats.error_warning++;
	443	cf->data[1] = (txerr > rxerr) ?
	444	CAN_ERR_CRTL_TX_WARNING :
	445	CAN_ERR_CRTL_RX_WARNING;
	446	} else {
	447	priv->can.can_stats.error_passive++;
	448	cf->data[1] = (txerr > rxerr) ?
	449	CAN_ERR_CRTL_TX_PASSIVE :
	450	CAN_ERR_CRTL_RX_PASSIVE;
	451	}
52c793f2 WG	452	cf->data[6] = txerr;
52c793f2 WG	453	cf->data[7] = rxerr;
429da1cc WG	454	}
	455
	456	priv->can.state = state;
	457
	458	netif_rx(skb);
	459
429da1cc WG	460	stats->rx_packets++;
	461	stats->rx_bytes += cf->can_dlc;
	462
	463	return 0;
	464	}
	465
	466	irqreturn_t sja1000_interrupt(int irq, void *dev_id)
	467	{
	468	struct net_device dev = (struct net_device )dev_id;
	469	struct sja1000_priv *priv = netdev_priv(dev);
	470	struct net_device_stats *stats = &dev->stats;
	471	uint8_t isrc, status;
	472	int n = 0;
	473
	474	/* Shared interrupts and IRQ off? */
255a9154	475	if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
429da1cc WG	476	return IRQ_NONE;
	477
	478	if (priv->pre_irq)
255a9154	479	priv->pre_irq(priv);
429da1cc	480
255a9154	481	while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
429da1cc	482	n++;
255a9154	483	status = priv->read_reg(priv, REG_SR);
429da1cc WG	484
	485	if (isrc & IRQ_WUI)
	486	dev_warn(dev->dev.parent, "wakeup interrupt\n");
	487
	488	if (isrc & IRQ_TI) {
	489	/* transmission complete interrupt */
8935f57e	490	stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf;
429da1cc WG	491	stats->tx_packets++;
	492	can_get_echo_skb(dev, 0);
	493	netif_wake_queue(dev);
	494	}
	495	if (isrc & IRQ_RI) {
	496	/* receive interrupt */
	497	while (status & SR_RBS) {
	498	sja1000_rx(dev);
255a9154	499	status = priv->read_reg(priv, REG_SR);
429da1cc WG	500	}
	501	}
	502	if (isrc & (IRQ_DOI \| IRQ_EI \| IRQ_BEI \| IRQ_EPI \| IRQ_ALI)) {
	503	/* error interrupt */
	504	if (sja1000_err(dev, isrc, status))
	505	break;
	506	}
	507	}
	508
	509	if (priv->post_irq)
255a9154	510	priv->post_irq(priv);
429da1cc WG	511
	512	if (n >= SJA1000_MAX_IRQ)
	513	dev_dbg(dev->dev.parent, "%d messages handled in ISR", n);
	514
	515	return (n) ? IRQ_HANDLED : IRQ_NONE;
	516	}
	517	EXPORT_SYMBOL_GPL(sja1000_interrupt);
	518
	519	static int sja1000_open(struct net_device *dev)
	520	{
	521	struct sja1000_priv *priv = netdev_priv(dev);
	522	int err;
	523
	524	/* set chip into reset mode */
	525	set_reset_mode(dev);
	526
	527	/* common open */
	528	err = open_candev(dev);
	529	if (err)
	530	return err;
	531
	532	/* register interrupt handler, if not done by the device driver */
	533	if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
4c9ba61e	534	err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
429da1cc WG	535	dev->name, (void *)dev);
429da1cc WG	536	if (err) {
429da1cc	537	close_candev(dev);
128ced8f	538	return -EAGAIN;
429da1cc WG	539	}
	540	}
	541
	542	/* init and start chi */
	543	sja1000_start(dev);
	544	priv->open_time = jiffies;
	545
	546	netif_start_queue(dev);
	547
	548	return 0;
	549	}
	550
	551	static int sja1000_close(struct net_device *dev)
	552	{
	553	struct sja1000_priv *priv = netdev_priv(dev);
	554
	555	netif_stop_queue(dev);
	556	set_reset_mode(dev);
	557
	558	if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
	559	free_irq(dev->irq, (void *)dev);
	560
	561	close_candev(dev);
	562
	563	priv->open_time = 0;
	564
	565	return 0;
	566	}
	567
	568	struct net_device *alloc_sja1000dev(int sizeof_priv)
	569	{
	570	struct net_device *dev;
	571	struct sja1000_priv *priv;
	572
a6e4bc53 WG	573	dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
a6e4bc53 WG	574	SJA1000_ECHO_SKB_MAX);
429da1cc WG	575	if (!dev)
	576	return NULL;
	577
	578	priv = netdev_priv(dev);
	579
	580	priv->dev = dev;
	581	priv->can.bittiming_const = &sja1000_bittiming_const;
	582	priv->can.do_set_bittiming = sja1000_set_bittiming;
	583	priv->can.do_set_mode = sja1000_set_mode;
52c793f2 WG	584	priv->can.do_get_berr_counter = sja1000_get_berr_counter;
	585	priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES \|
	586	CAN_CTRLMODE_BERR_REPORTING;
429da1cc WG	587
	588	if (sizeof_priv)
	589	priv->priv = (void *)priv + sizeof(struct sja1000_priv);
	590
	591	return dev;
	592	}
	593	EXPORT_SYMBOL_GPL(alloc_sja1000dev);
	594
	595	void free_sja1000dev(struct net_device *dev)
	596	{
	597	free_candev(dev);
	598	}
	599	EXPORT_SYMBOL_GPL(free_sja1000dev);
	600
	601	static const struct net_device_ops sja1000_netdev_ops = {
	602	.ndo_open = sja1000_open,
	603	.ndo_stop = sja1000_close,
	604	.ndo_start_xmit = sja1000_start_xmit,
	605	};
	606
	607	int register_sja1000dev(struct net_device *dev)
	608	{
	609	if (!sja1000_probe_chip(dev))
	610	return -ENODEV;
	611
	612	dev->flags \|= IFF_ECHO; /* we support local echo */
	613	dev->netdev_ops = &sja1000_netdev_ops;
	614
	615	set_reset_mode(dev);
	616	chipset_init(dev);
	617
	618	return register_candev(dev);
	619	}
	620	EXPORT_SYMBOL_GPL(register_sja1000dev);
	621
	622	void unregister_sja1000dev(struct net_device *dev)
	623	{
	624	set_reset_mode(dev);
	625	unregister_candev(dev);
	626	}
	627	EXPORT_SYMBOL_GPL(unregister_sja1000dev);
	628
	629	static __init int sja1000_init(void)
	630	{
	631	printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
	632
	633	return 0;
	634	}
	635
	636	module_init(sja1000_init);
	637
	638	static __exit void sja1000_exit(void)
	639	{
	640	printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
	641	}
	642
	643	module_exit(sja1000_exit);