[mirror_ubuntu-artful-kernel.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.
 *
 */

#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 const 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 void sja1000_write_cmdreg(struct sja1000_priv *priv, u8 val)
{
	unsigned long flags;

	/*
	 * The command register needs some locking and time to settle
	 * the write_reg() operation - especially on SMP systems.
	 */
	spin_lock_irqsave(&priv->cmdreg_lock, flags);
	priv->write_reg(priv, REG_CMR, val);
	priv->read_reg(priv, REG_SR);
	spin_unlock_irqrestore(&priv->cmdreg_lock, flags);
}

static int sja1000_is_absent(struct sja1000_priv *priv)
{
	return (priv->read_reg(priv, REG_MOD) == 0xFF);
}

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

	if (priv->reg_base && sja1000_is_absent(priv)) {
		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);
	}

	netdev_err(dev, "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 */
		if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
			priv->write_reg(priv, REG_MOD, MOD_LOM);
		else
			priv->write_reg(priv, REG_MOD, 0x00);

		udelay(10);

		status = priv->read_reg(priv, REG_MOD);
	}

	netdev_err(dev, "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)
{
	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;

	netdev_info(dev, "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);

	if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
		sja1000_write_cmdreg(priv, CMD_TR | CMD_AT);
	else
		sja1000_write_cmdreg(priv, 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);
	}

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

	cf->can_id = id;

	/* release receive buffer */
	sja1000_write_cmdreg(priv, 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 */
		netdev_dbg(dev, "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++;
		sja1000_write_cmdreg(priv, CMD_CDO);	/* clear bit */
	}

	if (isrc & IRQ_EI) {
		/* error warning interrupt */
		netdev_dbg(dev, "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 occurred during transmission? */
		if ((ecc & ECC_DIR) == 0)
			cf->data[2] |= CAN_ERR_PROT_TX;
	}
	if (isrc & IRQ_EPI) {
		/* error passive interrupt */
		netdev_dbg(dev, "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 */
		netdev_dbg(dev, "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);
		/* check for absent controller due to hw unplug */
		if (status == 0xFF && sja1000_is_absent(priv))
			return IRQ_NONE;

		if (isrc & IRQ_WUI)
			netdev_warn(dev, "wakeup interrupt\n");

		if (isrc & IRQ_TI) {
			/* transmission buffer released */
			if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT &&
			    !(status & SR_TCS)) {
				stats->tx_errors++;
				can_free_echo_skb(dev, 0);
			} else {
				/* transmission complete */
				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);
				/* check for absent controller */
				if (status == 0xFF && sja1000_is_absent(priv))
					return IRQ_NONE;
			}
		}
		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)
		netdev_dbg(dev, "%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);

	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);

	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 | CAN_CTRLMODE_LISTENONLY |
		CAN_CTRLMODE_ONE_SHOT;

	spin_lock_init(&priv->cmdreg_lock);

	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	*
429da1cc WG	43	*/
	44
	45	#include <linux/module.h>
	46	#include <linux/init.h>
	47	#include <linux/kernel.h>
	48	#include <linux/sched.h>
	49	#include <linux/types.h>
	50	#include <linux/fcntl.h>
	51	#include <linux/interrupt.h>
	52	#include <linux/ptrace.h>
	53	#include <linux/string.h>
	54	#include <linux/errno.h>
	55	#include <linux/netdevice.h>
	56	#include <linux/if_arp.h>
	57	#include <linux/if_ether.h>
	58	#include <linux/skbuff.h>
	59	#include <linux/delay.h>
	60
429da1cc WG	61	#include <linux/can/dev.h>
429da1cc WG	62	#include <linux/can/error.h>
429da1cc WG	63
	64	#include "sja1000.h"
	65
	66	#define DRV_NAME "sja1000"
	67
	68	MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
	69	MODULE_LICENSE("Dual BSD/GPL");
	70	MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
	71
194b9a4c	72	static const struct can_bittiming_const sja1000_bittiming_const = {
429da1cc WG	73	.name = DRV_NAME,
	74	.tseg1_min = 1,
	75	.tseg1_max = 16,
	76	.tseg2_min = 1,
	77	.tseg2_max = 8,
	78	.sjw_max = 4,
	79	.brp_min = 1,
	80	.brp_max = 64,
	81	.brp_inc = 1,
	82	};
	83
57c8a456 OH	84	static void sja1000_write_cmdreg(struct sja1000_priv *priv, u8 val)
	85	{
	86	unsigned long flags;
	87
	88	/*
	89	* The command register needs some locking and time to settle
	90	* the write_reg() operation - especially on SMP systems.
	91	*/
	92	spin_lock_irqsave(&priv->cmdreg_lock, flags);
	93	priv->write_reg(priv, REG_CMR, val);
	94	priv->read_reg(priv, REG_SR);
	95	spin_unlock_irqrestore(&priv->cmdreg_lock, flags);
	96	}
	97
a7762b10 OH	98	static int sja1000_is_absent(struct sja1000_priv *priv)
	99	{
	100	return (priv->read_reg(priv, REG_MOD) == 0xFF);
	101	}
	102
429da1cc WG	103	static int sja1000_probe_chip(struct net_device *dev)
	104	{
	105	struct sja1000_priv *priv = netdev_priv(dev);
	106
a7762b10	107	if (priv->reg_base && sja1000_is_absent(priv)) {
429da1cc WG	108	printk(KERN_INFO "%s: probing @0x%lX failed\n",
	109	DRV_NAME, dev->base_addr);
	110	return 0;
	111	}
	112	return -1;
	113	}
	114
	115	static void set_reset_mode(struct net_device *dev)
	116	{
	117	struct sja1000_priv *priv = netdev_priv(dev);
255a9154	118	unsigned char status = priv->read_reg(priv, REG_MOD);
429da1cc WG	119	int i;
	120
	121	/* disable interrupts */
255a9154	122	priv->write_reg(priv, REG_IER, IRQ_OFF);
429da1cc WG	123
	124	for (i = 0; i < 100; i++) {
	125	/* check reset bit */
	126	if (status & MOD_RM) {
	127	priv->can.state = CAN_STATE_STOPPED;
	128	return;
	129	}
	130
255a9154	131	priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */
429da1cc	132	udelay(10);
255a9154	133	status = priv->read_reg(priv, REG_MOD);
429da1cc WG	134	}
429da1cc WG	135
aabdfd6a	136	netdev_err(dev, "setting SJA1000 into reset mode failed!\n");
429da1cc WG	137	}
	138
	139	static void set_normal_mode(struct net_device *dev)
	140	{
	141	struct sja1000_priv *priv = netdev_priv(dev);
255a9154	142	unsigned char status = priv->read_reg(priv, REG_MOD);
429da1cc WG	143	int i;
	144
	145	for (i = 0; i < 100; i++) {
	146	/* check reset bit */
	147	if ((status & MOD_RM) == 0) {
	148	priv->can.state = CAN_STATE_ERROR_ACTIVE;
52c793f2 WG	149	/* enable interrupts */
	150	if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
	151	priv->write_reg(priv, REG_IER, IRQ_ALL);
	152	else
	153	priv->write_reg(priv, REG_IER,
	154	IRQ_ALL & ~IRQ_BEI);
429da1cc WG	155	return;
	156	}
	157
	158	/* set chip to normal mode */
7146b2d9 AL	159	if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
	160	priv->write_reg(priv, REG_MOD, MOD_LOM);
	161	else
	162	priv->write_reg(priv, REG_MOD, 0x00);
	163
429da1cc	164	udelay(10);
7146b2d9	165
255a9154	166	status = priv->read_reg(priv, REG_MOD);
429da1cc WG	167	}
429da1cc WG	168
aabdfd6a	169	netdev_err(dev, "setting SJA1000 into normal mode failed!\n");
429da1cc WG	170	}
	171
	172	static void sja1000_start(struct net_device *dev)
	173	{
	174	struct sja1000_priv *priv = netdev_priv(dev);
	175
	176	/* leave reset mode */
	177	if (priv->can.state != CAN_STATE_STOPPED)
	178	set_reset_mode(dev);
	179
	180	/* Clear error counters and error code capture */
255a9154 WG	181	priv->write_reg(priv, REG_TXERR, 0x0);
	182	priv->write_reg(priv, REG_RXERR, 0x0);
	183	priv->read_reg(priv, REG_ECC);
429da1cc WG	184
	185	/* leave reset mode */
	186	set_normal_mode(dev);
	187	}
	188
	189	static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
	190	{
429da1cc WG	191	switch (mode) {
	192	case CAN_MODE_START:
	193	sja1000_start(dev);
	194	if (netif_queue_stopped(dev))
	195	netif_wake_queue(dev);
	196	break;
	197
	198	default:
	199	return -EOPNOTSUPP;
	200	}
	201
	202	return 0;
	203	}
	204
	205	static int sja1000_set_bittiming(struct net_device *dev)
	206	{
	207	struct sja1000_priv *priv = netdev_priv(dev);
	208	struct can_bittiming *bt = &priv->can.bittiming;
	209	u8 btr0, btr1;
	210
	211	btr0 = ((bt->brp - 1) & 0x3f) \| (((bt->sjw - 1) & 0x3) << 6);
	212	btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) \|
	213	(((bt->phase_seg2 - 1) & 0x7) << 4);
	214	if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
	215	btr1 \|= 0x80;
	216
aabdfd6a	217	netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
429da1cc	218
255a9154 WG	219	priv->write_reg(priv, REG_BTR0, btr0);
255a9154 WG	220	priv->write_reg(priv, REG_BTR1, btr1);
429da1cc WG	221
	222	return 0;
	223	}
	224
52c793f2 WG	225	static int sja1000_get_berr_counter(const struct net_device *dev,
	226	struct can_berr_counter *bec)
	227	{
	228	struct sja1000_priv *priv = netdev_priv(dev);
	229
	230	bec->txerr = priv->read_reg(priv, REG_TXERR);
	231	bec->rxerr = priv->read_reg(priv, REG_RXERR);
	232
	233	return 0;
	234	}
	235
429da1cc WG	236	/*
	237	* initialize SJA1000 chip:
	238	* - reset chip
	239	* - set output mode
	240	* - set baudrate
	241	* - enable interrupts
	242	* - start operating mode
	243	*/
	244	static void chipset_init(struct net_device *dev)
	245	{
	246	struct sja1000_priv *priv = netdev_priv(dev);
	247
	248	/* set clock divider and output control register */
255a9154	249	priv->write_reg(priv, REG_CDR, priv->cdr \| CDR_PELICAN);
429da1cc WG	250
429da1cc WG	251	/* set acceptance filter (accept all) */
255a9154 WG	252	priv->write_reg(priv, REG_ACCC0, 0x00);
	253	priv->write_reg(priv, REG_ACCC1, 0x00);
	254	priv->write_reg(priv, REG_ACCC2, 0x00);
	255	priv->write_reg(priv, REG_ACCC3, 0x00);
429da1cc	256
255a9154 WG	257	priv->write_reg(priv, REG_ACCM0, 0xFF);
	258	priv->write_reg(priv, REG_ACCM1, 0xFF);
	259	priv->write_reg(priv, REG_ACCM2, 0xFF);
	260	priv->write_reg(priv, REG_ACCM3, 0xFF);
429da1cc	261
255a9154	262	priv->write_reg(priv, REG_OCR, priv->ocr \| OCR_MODE_NORMAL);
429da1cc WG	263	}
	264
	265	/*
	266	* transmit a CAN message
	267	* message layout in the sk_buff should be like this:
	268	* xx xx xx xx ff ll 00 11 22 33 44 55 66 77
	269	* [ can-id ] [flags] [len] [can data (up to 8 bytes]
	270	*/
61357325 SH	271	static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
61357325 SH	272	struct net_device *dev)
429da1cc WG	273	{
429da1cc WG	274	struct sja1000_priv *priv = netdev_priv(dev);
429da1cc WG	275	struct can_frame cf = (struct can_frame )skb->data;
	276	uint8_t fi;
	277	uint8_t dlc;
	278	canid_t id;
	279	uint8_t dreg;
	280	int i;
	281
3ccd4c61 OH	282	if (can_dropped_invalid_skb(dev, skb))
	283	return NETDEV_TX_OK;
	284
429da1cc WG	285	netif_stop_queue(dev);
	286
	287	fi = dlc = cf->can_dlc;
	288	id = cf->can_id;
	289
	290	if (id & CAN_RTR_FLAG)
	291	fi \|= FI_RTR;
	292
	293	if (id & CAN_EFF_FLAG) {
	294	fi \|= FI_FF;
	295	dreg = EFF_BUF;
255a9154 WG	296	priv->write_reg(priv, REG_FI, fi);
	297	priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
	298	priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
	299	priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
	300	priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
429da1cc WG	301	} else {
429da1cc WG	302	dreg = SFF_BUF;
255a9154 WG	303	priv->write_reg(priv, REG_FI, fi);
	304	priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
	305	priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
429da1cc WG	306	}
	307
	308	for (i = 0; i < dlc; i++)
255a9154	309	priv->write_reg(priv, dreg++, cf->data[i]);
429da1cc	310
429da1cc WG	311	can_put_echo_skb(skb, dev, 0);
429da1cc WG	312
7146b2d9 AL	313	if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
	314	sja1000_write_cmdreg(priv, CMD_TR \| CMD_AT);
	315	else
	316	sja1000_write_cmdreg(priv, CMD_TR);
429da1cc	317
6ed10654	318	return NETDEV_TX_OK;
429da1cc WG	319	}
	320
	321	static void sja1000_rx(struct net_device *dev)
	322	{
	323	struct sja1000_priv *priv = netdev_priv(dev);
	324	struct net_device_stats *stats = &dev->stats;
	325	struct can_frame *cf;
	326	struct sk_buff *skb;
	327	uint8_t fi;
	328	uint8_t dreg;
	329	canid_t id;
429da1cc WG	330	int i;
429da1cc WG	331
c7cd606f	332	/* create zero'ed CAN frame buffer */
7b6856a0	333	skb = alloc_can_skb(dev, &cf);
429da1cc WG	334	if (skb == NULL)
429da1cc WG	335	return;
429da1cc	336
255a9154	337	fi = priv->read_reg(priv, REG_FI);
429da1cc WG	338
	339	if (fi & FI_FF) {
	340	/* extended frame format (EFF) */
	341	dreg = EFF_BUF;
255a9154 WG	342	id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
	343	\| (priv->read_reg(priv, REG_ID2) << (5 + 8))
	344	\| (priv->read_reg(priv, REG_ID3) << 5)
	345	\| (priv->read_reg(priv, REG_ID4) >> 3);
429da1cc WG	346	id \|= CAN_EFF_FLAG;
	347	} else {
	348	/* standard frame format (SFF) */
	349	dreg = SFF_BUF;
255a9154 WG	350	id = (priv->read_reg(priv, REG_ID1) << 3)
255a9154 WG	351	\| (priv->read_reg(priv, REG_ID2) >> 5);
429da1cc WG	352	}
429da1cc WG	353
87e9af6c	354	cf->can_dlc = get_can_dlc(fi & 0x0F);
c7cd606f	355	if (fi & FI_RTR) {
429da1cc	356	id \|= CAN_RTR_FLAG;
c7cd606f	357	} else {
c7cd606f OH	358	for (i = 0; i < cf->can_dlc; i++)
	359	cf->data[i] = priv->read_reg(priv, dreg++);
	360	}
429da1cc	361
429da1cc	362	cf->can_id = id;
429da1cc WG	363
429da1cc WG	364	/* release receive buffer */
57c8a456	365	sja1000_write_cmdreg(priv, CMD_RRB);
429da1cc WG	366
	367	netif_rx(skb);
	368
429da1cc	369	stats->rx_packets++;
c7cd606f	370	stats->rx_bytes += cf->can_dlc;
429da1cc WG	371	}
	372
	373	static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
	374	{
	375	struct sja1000_priv *priv = netdev_priv(dev);
	376	struct net_device_stats *stats = &dev->stats;
	377	struct can_frame *cf;
	378	struct sk_buff *skb;
	379	enum can_state state = priv->can.state;
	380	uint8_t ecc, alc;
	381
7b6856a0	382	skb = alloc_can_err_skb(dev, &cf);
429da1cc WG	383	if (skb == NULL)
429da1cc WG	384	return -ENOMEM;
429da1cc WG	385
	386	if (isrc & IRQ_DOI) {
	387	/* data overrun interrupt */
aabdfd6a	388	netdev_dbg(dev, "data overrun interrupt\n");
429da1cc WG	389	cf->can_id \|= CAN_ERR_CRTL;
	390	cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
	391	stats->rx_over_errors++;
	392	stats->rx_errors++;
57c8a456	393	sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */
429da1cc WG	394	}
	395
	396	if (isrc & IRQ_EI) {
	397	/* error warning interrupt */
aabdfd6a	398	netdev_dbg(dev, "error warning interrupt\n");
429da1cc WG	399
	400	if (status & SR_BS) {
	401	state = CAN_STATE_BUS_OFF;
	402	cf->can_id \|= CAN_ERR_BUSOFF;
	403	can_bus_off(dev);
	404	} else if (status & SR_ES) {
	405	state = CAN_STATE_ERROR_WARNING;
	406	} else
	407	state = CAN_STATE_ERROR_ACTIVE;
	408	}
	409	if (isrc & IRQ_BEI) {
	410	/* bus error interrupt */
	411	priv->can.can_stats.bus_error++;
	412	stats->rx_errors++;
	413
255a9154	414	ecc = priv->read_reg(priv, REG_ECC);
429da1cc WG	415
	416	cf->can_id \|= CAN_ERR_PROT \| CAN_ERR_BUSERROR;
	417
	418	switch (ecc & ECC_MASK) {
	419	case ECC_BIT:
	420	cf->data[2] \|= CAN_ERR_PROT_BIT;
	421	break;
	422	case ECC_FORM:
	423	cf->data[2] \|= CAN_ERR_PROT_FORM;
	424	break;
	425	case ECC_STUFF:
	426	cf->data[2] \|= CAN_ERR_PROT_STUFF;
	427	break;
	428	default:
	429	cf->data[2] \|= CAN_ERR_PROT_UNSPEC;
	430	cf->data[3] = ecc & ECC_SEG;
	431	break;
	432	}
25985edc	433	/* Error occurred during transmission? */
429da1cc WG	434	if ((ecc & ECC_DIR) == 0)
	435	cf->data[2] \|= CAN_ERR_PROT_TX;
	436	}
	437	if (isrc & IRQ_EPI) {
	438	/* error passive interrupt */
aabdfd6a	439	netdev_dbg(dev, "error passive interrupt\n");
429da1cc WG	440	if (status & SR_ES)
	441	state = CAN_STATE_ERROR_PASSIVE;
	442	else
	443	state = CAN_STATE_ERROR_ACTIVE;
	444	}
	445	if (isrc & IRQ_ALI) {
	446	/* arbitration lost interrupt */
aabdfd6a	447	netdev_dbg(dev, "arbitration lost interrupt\n");
255a9154	448	alc = priv->read_reg(priv, REG_ALC);
429da1cc	449	priv->can.can_stats.arbitration_lost++;
8935f57e	450	stats->tx_errors++;
429da1cc WG	451	cf->can_id \|= CAN_ERR_LOSTARB;
	452	cf->data[0] = alc & 0x1f;
	453	}
	454
	455	if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING \|\|
	456	state == CAN_STATE_ERROR_PASSIVE)) {
255a9154 WG	457	uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
255a9154 WG	458	uint8_t txerr = priv->read_reg(priv, REG_TXERR);
429da1cc WG	459	cf->can_id \|= CAN_ERR_CRTL;
	460	if (state == CAN_STATE_ERROR_WARNING) {
	461	priv->can.can_stats.error_warning++;
	462	cf->data[1] = (txerr > rxerr) ?
	463	CAN_ERR_CRTL_TX_WARNING :
	464	CAN_ERR_CRTL_RX_WARNING;
	465	} else {
	466	priv->can.can_stats.error_passive++;
	467	cf->data[1] = (txerr > rxerr) ?
	468	CAN_ERR_CRTL_TX_PASSIVE :
	469	CAN_ERR_CRTL_RX_PASSIVE;
	470	}
52c793f2 WG	471	cf->data[6] = txerr;
52c793f2 WG	472	cf->data[7] = rxerr;
429da1cc WG	473	}
	474
	475	priv->can.state = state;
	476
	477	netif_rx(skb);
	478
429da1cc WG	479	stats->rx_packets++;
	480	stats->rx_bytes += cf->can_dlc;
	481
	482	return 0;
	483	}
	484
	485	irqreturn_t sja1000_interrupt(int irq, void *dev_id)
	486	{
	487	struct net_device dev = (struct net_device )dev_id;
	488	struct sja1000_priv *priv = netdev_priv(dev);
	489	struct net_device_stats *stats = &dev->stats;
	490	uint8_t isrc, status;
	491	int n = 0;
	492
	493	/* Shared interrupts and IRQ off? */
255a9154	494	if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
429da1cc WG	495	return IRQ_NONE;
	496
	497	if (priv->pre_irq)
255a9154	498	priv->pre_irq(priv);
429da1cc	499
255a9154	500	while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
429da1cc	501	n++;
255a9154	502	status = priv->read_reg(priv, REG_SR);
a7762b10 OH	503	/* check for absent controller due to hw unplug */
	504	if (status == 0xFF && sja1000_is_absent(priv))
	505	return IRQ_NONE;
429da1cc WG	506
429da1cc WG	507	if (isrc & IRQ_WUI)
aabdfd6a	508	netdev_warn(dev, "wakeup interrupt\n");
429da1cc WG	509
429da1cc WG	510	if (isrc & IRQ_TI) {
7146b2d9 AL	511	/* transmission buffer released */
	512	if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT &&
	513	!(status & SR_TCS)) {
	514	stats->tx_errors++;
	515	can_free_echo_skb(dev, 0);
	516	} else {
	517	/* transmission complete */
	518	stats->tx_bytes +=
	519	priv->read_reg(priv, REG_FI) & 0xf;
	520	stats->tx_packets++;
	521	can_get_echo_skb(dev, 0);
	522	}
429da1cc WG	523	netif_wake_queue(dev);
	524	}
	525	if (isrc & IRQ_RI) {
	526	/* receive interrupt */
	527	while (status & SR_RBS) {
	528	sja1000_rx(dev);
255a9154	529	status = priv->read_reg(priv, REG_SR);
a7762b10 OH	530	/* check for absent controller */
	531	if (status == 0xFF && sja1000_is_absent(priv))
	532	return IRQ_NONE;
429da1cc WG	533	}
	534	}
	535	if (isrc & (IRQ_DOI \| IRQ_EI \| IRQ_BEI \| IRQ_EPI \| IRQ_ALI)) {
	536	/* error interrupt */
	537	if (sja1000_err(dev, isrc, status))
	538	break;
	539	}
	540	}
	541
	542	if (priv->post_irq)
255a9154	543	priv->post_irq(priv);
429da1cc WG	544
429da1cc WG	545	if (n >= SJA1000_MAX_IRQ)
aabdfd6a	546	netdev_dbg(dev, "%d messages handled in ISR", n);
429da1cc WG	547
	548	return (n) ? IRQ_HANDLED : IRQ_NONE;
	549	}
	550	EXPORT_SYMBOL_GPL(sja1000_interrupt);
	551
	552	static int sja1000_open(struct net_device *dev)
	553	{
	554	struct sja1000_priv *priv = netdev_priv(dev);
	555	int err;
	556
	557	/* set chip into reset mode */
	558	set_reset_mode(dev);
	559
	560	/* common open */
	561	err = open_candev(dev);
	562	if (err)
	563	return err;
	564
	565	/* register interrupt handler, if not done by the device driver */
	566	if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
4c9ba61e	567	err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
429da1cc WG	568	dev->name, (void *)dev);
429da1cc WG	569	if (err) {
429da1cc	570	close_candev(dev);
128ced8f	571	return -EAGAIN;
429da1cc WG	572	}
	573	}
	574
	575	/* init and start chi */
	576	sja1000_start(dev);
429da1cc WG	577
	578	netif_start_queue(dev);
	579
	580	return 0;
	581	}
	582
	583	static int sja1000_close(struct net_device *dev)
	584	{
	585	struct sja1000_priv *priv = netdev_priv(dev);
	586
	587	netif_stop_queue(dev);
	588	set_reset_mode(dev);
	589
	590	if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
	591	free_irq(dev->irq, (void *)dev);
	592
	593	close_candev(dev);
	594
429da1cc WG	595	return 0;
	596	}
	597
	598	struct net_device *alloc_sja1000dev(int sizeof_priv)
	599	{
	600	struct net_device *dev;
	601	struct sja1000_priv *priv;
	602
a6e4bc53 WG	603	dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
a6e4bc53 WG	604	SJA1000_ECHO_SKB_MAX);
429da1cc WG	605	if (!dev)
	606	return NULL;
	607
	608	priv = netdev_priv(dev);
	609
	610	priv->dev = dev;
	611	priv->can.bittiming_const = &sja1000_bittiming_const;
	612	priv->can.do_set_bittiming = sja1000_set_bittiming;
	613	priv->can.do_set_mode = sja1000_set_mode;
52c793f2 WG	614	priv->can.do_get_berr_counter = sja1000_get_berr_counter;
52c793f2 WG	615	priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES \|
7146b2d9 AL	616	CAN_CTRLMODE_BERR_REPORTING \| CAN_CTRLMODE_LISTENONLY \|
7146b2d9 AL	617	CAN_CTRLMODE_ONE_SHOT;
429da1cc	618
1f01bfd2 OH	619	spin_lock_init(&priv->cmdreg_lock);
1f01bfd2 OH	620
429da1cc WG	621	if (sizeof_priv)
	622	priv->priv = (void *)priv + sizeof(struct sja1000_priv);
	623
	624	return dev;
	625	}
	626	EXPORT_SYMBOL_GPL(alloc_sja1000dev);
	627
	628	void free_sja1000dev(struct net_device *dev)
	629	{
	630	free_candev(dev);
	631	}
	632	EXPORT_SYMBOL_GPL(free_sja1000dev);
	633
	634	static const struct net_device_ops sja1000_netdev_ops = {
	635	.ndo_open = sja1000_open,
	636	.ndo_stop = sja1000_close,
	637	.ndo_start_xmit = sja1000_start_xmit,
	638	};
	639
	640	int register_sja1000dev(struct net_device *dev)
	641	{
	642	if (!sja1000_probe_chip(dev))
	643	return -ENODEV;
	644
	645	dev->flags \|= IFF_ECHO; /* we support local echo */
	646	dev->netdev_ops = &sja1000_netdev_ops;
	647
	648	set_reset_mode(dev);
	649	chipset_init(dev);
	650
	651	return register_candev(dev);
	652	}
	653	EXPORT_SYMBOL_GPL(register_sja1000dev);
	654
	655	void unregister_sja1000dev(struct net_device *dev)
	656	{
	657	set_reset_mode(dev);
	658	unregister_candev(dev);
	659	}
	660	EXPORT_SYMBOL_GPL(unregister_sja1000dev);
	661
	662	static __init int sja1000_init(void)
	663	{
	664	printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
	665
	666	return 0;
	667	}
	668
	669	module_init(sja1000_init);
	670
	671	static __exit void sja1000_exit(void)
	672	{
	673	printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
	674	}
	675
	676	module_exit(sja1000_exit);