[deliverable/linux.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 <linux/can/led.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, SJA1000_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;

	can_led_event(dev, CAN_LED_EVENT_RX);
}

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, SJA1000_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);
			can_led_event(dev, CAN_LED_EVENT_TX);
		}
		if (isrc & IRQ_RI) {
			/* receive interrupt */
			while (status & SR_RBS) {
				sja1000_rx(dev);
				status = priv->read_reg(priv, SJA1000_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);

	can_led_event(dev, CAN_LED_EVENT_OPEN);

	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);

	can_led_event(dev, CAN_LED_EVENT_STOP);

	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)
{
	int ret;

	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);

	ret =  register_candev(dev);

	if (!ret)
		devm_can_led_init(dev);

	return ret;
}
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>
a04282f5	63	#include <linux/can/led.h>
429da1cc WG	64
	65	#include "sja1000.h"
	66
	67	#define DRV_NAME "sja1000"
	68
	69	MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
	70	MODULE_LICENSE("Dual BSD/GPL");
	71	MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
	72
194b9a4c	73	static const struct can_bittiming_const sja1000_bittiming_const = {
429da1cc WG	74	.name = DRV_NAME,
	75	.tseg1_min = 1,
	76	.tseg1_max = 16,
	77	.tseg2_min = 1,
	78	.tseg2_max = 8,
	79	.sjw_max = 4,
	80	.brp_min = 1,
	81	.brp_max = 64,
	82	.brp_inc = 1,
	83	};
	84
57c8a456 OH	85	static void sja1000_write_cmdreg(struct sja1000_priv *priv, u8 val)
	86	{
	87	unsigned long flags;
	88
	89	/*
	90	* The command register needs some locking and time to settle
	91	* the write_reg() operation - especially on SMP systems.
	92	*/
	93	spin_lock_irqsave(&priv->cmdreg_lock, flags);
	94	priv->write_reg(priv, REG_CMR, val);
f901b6bc	95	priv->read_reg(priv, SJA1000_REG_SR);
57c8a456 OH	96	spin_unlock_irqrestore(&priv->cmdreg_lock, flags);
	97	}
	98
a7762b10 OH	99	static int sja1000_is_absent(struct sja1000_priv *priv)
	100	{
	101	return (priv->read_reg(priv, REG_MOD) == 0xFF);
	102	}
	103
429da1cc WG	104	static int sja1000_probe_chip(struct net_device *dev)
	105	{
	106	struct sja1000_priv *priv = netdev_priv(dev);
	107
a7762b10	108	if (priv->reg_base && sja1000_is_absent(priv)) {
429da1cc WG	109	printk(KERN_INFO "%s: probing @0x%lX failed\n",
	110	DRV_NAME, dev->base_addr);
	111	return 0;
	112	}
	113	return -1;
	114	}
	115
	116	static void set_reset_mode(struct net_device *dev)
	117	{
	118	struct sja1000_priv *priv = netdev_priv(dev);
255a9154	119	unsigned char status = priv->read_reg(priv, REG_MOD);
429da1cc WG	120	int i;
	121
	122	/* disable interrupts */
255a9154	123	priv->write_reg(priv, REG_IER, IRQ_OFF);
429da1cc WG	124
	125	for (i = 0; i < 100; i++) {
	126	/* check reset bit */
	127	if (status & MOD_RM) {
	128	priv->can.state = CAN_STATE_STOPPED;
	129	return;
	130	}
	131
255a9154	132	priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */
429da1cc	133	udelay(10);
255a9154	134	status = priv->read_reg(priv, REG_MOD);
429da1cc WG	135	}
429da1cc WG	136
aabdfd6a	137	netdev_err(dev, "setting SJA1000 into reset mode failed!\n");
429da1cc WG	138	}
	139
	140	static void set_normal_mode(struct net_device *dev)
	141	{
	142	struct sja1000_priv *priv = netdev_priv(dev);
255a9154	143	unsigned char status = priv->read_reg(priv, REG_MOD);
429da1cc WG	144	int i;
	145
	146	for (i = 0; i < 100; i++) {
	147	/* check reset bit */
	148	if ((status & MOD_RM) == 0) {
	149	priv->can.state = CAN_STATE_ERROR_ACTIVE;
52c793f2 WG	150	/* enable interrupts */
	151	if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
	152	priv->write_reg(priv, REG_IER, IRQ_ALL);
	153	else
	154	priv->write_reg(priv, REG_IER,
	155	IRQ_ALL & ~IRQ_BEI);
429da1cc WG	156	return;
	157	}
	158
	159	/* set chip to normal mode */
7146b2d9 AL	160	if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
	161	priv->write_reg(priv, REG_MOD, MOD_LOM);
	162	else
	163	priv->write_reg(priv, REG_MOD, 0x00);
	164
429da1cc	165	udelay(10);
7146b2d9	166
255a9154	167	status = priv->read_reg(priv, REG_MOD);
429da1cc WG	168	}
429da1cc WG	169
aabdfd6a	170	netdev_err(dev, "setting SJA1000 into normal mode failed!\n");
429da1cc WG	171	}
	172
	173	static void sja1000_start(struct net_device *dev)
	174	{
	175	struct sja1000_priv *priv = netdev_priv(dev);
	176
	177	/* leave reset mode */
	178	if (priv->can.state != CAN_STATE_STOPPED)
	179	set_reset_mode(dev);
	180
	181	/* Clear error counters and error code capture */
255a9154 WG	182	priv->write_reg(priv, REG_TXERR, 0x0);
	183	priv->write_reg(priv, REG_RXERR, 0x0);
	184	priv->read_reg(priv, REG_ECC);
429da1cc WG	185
	186	/* leave reset mode */
	187	set_normal_mode(dev);
	188	}
	189
	190	static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
	191	{
429da1cc WG	192	switch (mode) {
	193	case CAN_MODE_START:
	194	sja1000_start(dev);
	195	if (netif_queue_stopped(dev))
	196	netif_wake_queue(dev);
	197	break;
	198
	199	default:
	200	return -EOPNOTSUPP;
	201	}
	202
	203	return 0;
	204	}
	205
	206	static int sja1000_set_bittiming(struct net_device *dev)
	207	{
	208	struct sja1000_priv *priv = netdev_priv(dev);
	209	struct can_bittiming *bt = &priv->can.bittiming;
	210	u8 btr0, btr1;
	211
	212	btr0 = ((bt->brp - 1) & 0x3f) \| (((bt->sjw - 1) & 0x3) << 6);
	213	btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) \|
	214	(((bt->phase_seg2 - 1) & 0x7) << 4);
	215	if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
	216	btr1 \|= 0x80;
	217
aabdfd6a	218	netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
429da1cc	219
255a9154 WG	220	priv->write_reg(priv, REG_BTR0, btr0);
255a9154 WG	221	priv->write_reg(priv, REG_BTR1, btr1);
429da1cc WG	222
	223	return 0;
	224	}
	225
52c793f2 WG	226	static int sja1000_get_berr_counter(const struct net_device *dev,
	227	struct can_berr_counter *bec)
	228	{
	229	struct sja1000_priv *priv = netdev_priv(dev);
	230
	231	bec->txerr = priv->read_reg(priv, REG_TXERR);
	232	bec->rxerr = priv->read_reg(priv, REG_RXERR);
	233
	234	return 0;
	235	}
	236
429da1cc WG	237	/*
	238	* initialize SJA1000 chip:
	239	* - reset chip
	240	* - set output mode
	241	* - set baudrate
	242	* - enable interrupts
	243	* - start operating mode
	244	*/
	245	static void chipset_init(struct net_device *dev)
	246	{
	247	struct sja1000_priv *priv = netdev_priv(dev);
	248
	249	/* set clock divider and output control register */
255a9154	250	priv->write_reg(priv, REG_CDR, priv->cdr \| CDR_PELICAN);
429da1cc WG	251
429da1cc WG	252	/* set acceptance filter (accept all) */
255a9154 WG	253	priv->write_reg(priv, REG_ACCC0, 0x00);
	254	priv->write_reg(priv, REG_ACCC1, 0x00);
	255	priv->write_reg(priv, REG_ACCC2, 0x00);
	256	priv->write_reg(priv, REG_ACCC3, 0x00);
429da1cc	257
255a9154 WG	258	priv->write_reg(priv, REG_ACCM0, 0xFF);
	259	priv->write_reg(priv, REG_ACCM1, 0xFF);
	260	priv->write_reg(priv, REG_ACCM2, 0xFF);
	261	priv->write_reg(priv, REG_ACCM3, 0xFF);
429da1cc	262
255a9154	263	priv->write_reg(priv, REG_OCR, priv->ocr \| OCR_MODE_NORMAL);
429da1cc WG	264	}
	265
	266	/*
	267	* transmit a CAN message
	268	* message layout in the sk_buff should be like this:
	269	* xx xx xx xx ff ll 00 11 22 33 44 55 66 77
	270	* [ can-id ] [flags] [len] [can data (up to 8 bytes]
	271	*/
61357325 SH	272	static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
61357325 SH	273	struct net_device *dev)
429da1cc WG	274	{
429da1cc WG	275	struct sja1000_priv *priv = netdev_priv(dev);
429da1cc WG	276	struct can_frame cf = (struct can_frame )skb->data;
	277	uint8_t fi;
	278	uint8_t dlc;
	279	canid_t id;
	280	uint8_t dreg;
	281	int i;
	282
3ccd4c61 OH	283	if (can_dropped_invalid_skb(dev, skb))
	284	return NETDEV_TX_OK;
	285
429da1cc WG	286	netif_stop_queue(dev);
	287
	288	fi = dlc = cf->can_dlc;
	289	id = cf->can_id;
	290
	291	if (id & CAN_RTR_FLAG)
	292	fi \|= FI_RTR;
	293
	294	if (id & CAN_EFF_FLAG) {
	295	fi \|= FI_FF;
	296	dreg = EFF_BUF;
255a9154 WG	297	priv->write_reg(priv, REG_FI, fi);
	298	priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
	299	priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
	300	priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
	301	priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
429da1cc WG	302	} else {
429da1cc WG	303	dreg = SFF_BUF;
255a9154 WG	304	priv->write_reg(priv, REG_FI, fi);
	305	priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
	306	priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
429da1cc WG	307	}
	308
	309	for (i = 0; i < dlc; i++)
255a9154	310	priv->write_reg(priv, dreg++, cf->data[i]);
429da1cc	311
429da1cc WG	312	can_put_echo_skb(skb, dev, 0);
429da1cc WG	313
7146b2d9 AL	314	if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
	315	sja1000_write_cmdreg(priv, CMD_TR \| CMD_AT);
	316	else
	317	sja1000_write_cmdreg(priv, CMD_TR);
429da1cc	318
6ed10654	319	return NETDEV_TX_OK;
429da1cc WG	320	}
	321
	322	static void sja1000_rx(struct net_device *dev)
	323	{
	324	struct sja1000_priv *priv = netdev_priv(dev);
	325	struct net_device_stats *stats = &dev->stats;
	326	struct can_frame *cf;
	327	struct sk_buff *skb;
	328	uint8_t fi;
	329	uint8_t dreg;
	330	canid_t id;
429da1cc WG	331	int i;
429da1cc WG	332
c7cd606f	333	/* create zero'ed CAN frame buffer */
7b6856a0	334	skb = alloc_can_skb(dev, &cf);
429da1cc WG	335	if (skb == NULL)
429da1cc WG	336	return;
429da1cc	337
255a9154	338	fi = priv->read_reg(priv, REG_FI);
429da1cc WG	339
	340	if (fi & FI_FF) {
	341	/* extended frame format (EFF) */
	342	dreg = EFF_BUF;
255a9154 WG	343	id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
	344	\| (priv->read_reg(priv, REG_ID2) << (5 + 8))
	345	\| (priv->read_reg(priv, REG_ID3) << 5)
	346	\| (priv->read_reg(priv, REG_ID4) >> 3);
429da1cc WG	347	id \|= CAN_EFF_FLAG;
	348	} else {
	349	/* standard frame format (SFF) */
	350	dreg = SFF_BUF;
255a9154 WG	351	id = (priv->read_reg(priv, REG_ID1) << 3)
255a9154 WG	352	\| (priv->read_reg(priv, REG_ID2) >> 5);
429da1cc WG	353	}
429da1cc WG	354
87e9af6c	355	cf->can_dlc = get_can_dlc(fi & 0x0F);
c7cd606f	356	if (fi & FI_RTR) {
429da1cc	357	id \|= CAN_RTR_FLAG;
c7cd606f	358	} else {
c7cd606f OH	359	for (i = 0; i < cf->can_dlc; i++)
	360	cf->data[i] = priv->read_reg(priv, dreg++);
	361	}
429da1cc	362
429da1cc	363	cf->can_id = id;
429da1cc WG	364
429da1cc WG	365	/* release receive buffer */
57c8a456	366	sja1000_write_cmdreg(priv, CMD_RRB);
429da1cc WG	367
	368	netif_rx(skb);
	369
429da1cc	370	stats->rx_packets++;
c7cd606f	371	stats->rx_bytes += cf->can_dlc;
a04282f5 FB	372
a04282f5 FB	373	can_led_event(dev, CAN_LED_EVENT_RX);
429da1cc WG	374	}
	375
	376	static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
	377	{
	378	struct sja1000_priv *priv = netdev_priv(dev);
	379	struct net_device_stats *stats = &dev->stats;
	380	struct can_frame *cf;
	381	struct sk_buff *skb;
	382	enum can_state state = priv->can.state;
	383	uint8_t ecc, alc;
	384
7b6856a0	385	skb = alloc_can_err_skb(dev, &cf);
429da1cc WG	386	if (skb == NULL)
429da1cc WG	387	return -ENOMEM;
429da1cc WG	388
	389	if (isrc & IRQ_DOI) {
	390	/* data overrun interrupt */
aabdfd6a	391	netdev_dbg(dev, "data overrun interrupt\n");
429da1cc WG	392	cf->can_id \|= CAN_ERR_CRTL;
	393	cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
	394	stats->rx_over_errors++;
	395	stats->rx_errors++;
57c8a456	396	sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */
429da1cc WG	397	}
	398
	399	if (isrc & IRQ_EI) {
	400	/* error warning interrupt */
aabdfd6a	401	netdev_dbg(dev, "error warning interrupt\n");
429da1cc WG	402
	403	if (status & SR_BS) {
	404	state = CAN_STATE_BUS_OFF;
	405	cf->can_id \|= CAN_ERR_BUSOFF;
	406	can_bus_off(dev);
	407	} else if (status & SR_ES) {
	408	state = CAN_STATE_ERROR_WARNING;
	409	} else
	410	state = CAN_STATE_ERROR_ACTIVE;
	411	}
	412	if (isrc & IRQ_BEI) {
	413	/* bus error interrupt */
	414	priv->can.can_stats.bus_error++;
	415	stats->rx_errors++;
	416
255a9154	417	ecc = priv->read_reg(priv, REG_ECC);
429da1cc WG	418
	419	cf->can_id \|= CAN_ERR_PROT \| CAN_ERR_BUSERROR;
	420
	421	switch (ecc & ECC_MASK) {
	422	case ECC_BIT:
	423	cf->data[2] \|= CAN_ERR_PROT_BIT;
	424	break;
	425	case ECC_FORM:
	426	cf->data[2] \|= CAN_ERR_PROT_FORM;
	427	break;
	428	case ECC_STUFF:
	429	cf->data[2] \|= CAN_ERR_PROT_STUFF;
	430	break;
	431	default:
	432	cf->data[2] \|= CAN_ERR_PROT_UNSPEC;
	433	cf->data[3] = ecc & ECC_SEG;
	434	break;
	435	}
25985edc	436	/* Error occurred during transmission? */
429da1cc WG	437	if ((ecc & ECC_DIR) == 0)
	438	cf->data[2] \|= CAN_ERR_PROT_TX;
	439	}
	440	if (isrc & IRQ_EPI) {
	441	/* error passive interrupt */
aabdfd6a	442	netdev_dbg(dev, "error passive interrupt\n");
429da1cc WG	443	if (status & SR_ES)
	444	state = CAN_STATE_ERROR_PASSIVE;
	445	else
	446	state = CAN_STATE_ERROR_ACTIVE;
	447	}
	448	if (isrc & IRQ_ALI) {
	449	/* arbitration lost interrupt */
aabdfd6a	450	netdev_dbg(dev, "arbitration lost interrupt\n");
255a9154	451	alc = priv->read_reg(priv, REG_ALC);
429da1cc	452	priv->can.can_stats.arbitration_lost++;
8935f57e	453	stats->tx_errors++;
429da1cc WG	454	cf->can_id \|= CAN_ERR_LOSTARB;
	455	cf->data[0] = alc & 0x1f;
	456	}
	457
	458	if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING \|\|
	459	state == CAN_STATE_ERROR_PASSIVE)) {
255a9154 WG	460	uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
255a9154 WG	461	uint8_t txerr = priv->read_reg(priv, REG_TXERR);
429da1cc WG	462	cf->can_id \|= CAN_ERR_CRTL;
	463	if (state == CAN_STATE_ERROR_WARNING) {
	464	priv->can.can_stats.error_warning++;
	465	cf->data[1] = (txerr > rxerr) ?
	466	CAN_ERR_CRTL_TX_WARNING :
	467	CAN_ERR_CRTL_RX_WARNING;
	468	} else {
	469	priv->can.can_stats.error_passive++;
	470	cf->data[1] = (txerr > rxerr) ?
	471	CAN_ERR_CRTL_TX_PASSIVE :
	472	CAN_ERR_CRTL_RX_PASSIVE;
	473	}
52c793f2 WG	474	cf->data[6] = txerr;
52c793f2 WG	475	cf->data[7] = rxerr;
429da1cc WG	476	}
	477
	478	priv->can.state = state;
	479
	480	netif_rx(skb);
	481
429da1cc WG	482	stats->rx_packets++;
	483	stats->rx_bytes += cf->can_dlc;
	484
	485	return 0;
	486	}
	487
	488	irqreturn_t sja1000_interrupt(int irq, void *dev_id)
	489	{
	490	struct net_device dev = (struct net_device )dev_id;
	491	struct sja1000_priv *priv = netdev_priv(dev);
	492	struct net_device_stats *stats = &dev->stats;
	493	uint8_t isrc, status;
	494	int n = 0;
	495
	496	/* Shared interrupts and IRQ off? */
255a9154	497	if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
429da1cc WG	498	return IRQ_NONE;
	499
	500	if (priv->pre_irq)
255a9154	501	priv->pre_irq(priv);
429da1cc	502
255a9154	503	while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
429da1cc	504	n++;
f901b6bc	505	status = priv->read_reg(priv, SJA1000_REG_SR);
a7762b10 OH	506	/* check for absent controller due to hw unplug */
	507	if (status == 0xFF && sja1000_is_absent(priv))
	508	return IRQ_NONE;
429da1cc WG	509
429da1cc WG	510	if (isrc & IRQ_WUI)
aabdfd6a	511	netdev_warn(dev, "wakeup interrupt\n");
429da1cc WG	512
429da1cc WG	513	if (isrc & IRQ_TI) {
7146b2d9 AL	514	/* transmission buffer released */
	515	if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT &&
	516	!(status & SR_TCS)) {
	517	stats->tx_errors++;
	518	can_free_echo_skb(dev, 0);
	519	} else {
	520	/* transmission complete */
	521	stats->tx_bytes +=
	522	priv->read_reg(priv, REG_FI) & 0xf;
	523	stats->tx_packets++;
	524	can_get_echo_skb(dev, 0);
	525	}
429da1cc	526	netif_wake_queue(dev);
a04282f5	527	can_led_event(dev, CAN_LED_EVENT_TX);
429da1cc WG	528	}
	529	if (isrc & IRQ_RI) {
	530	/* receive interrupt */
	531	while (status & SR_RBS) {
	532	sja1000_rx(dev);
f901b6bc	533	status = priv->read_reg(priv, SJA1000_REG_SR);
a7762b10 OH	534	/* check for absent controller */
	535	if (status == 0xFF && sja1000_is_absent(priv))
	536	return IRQ_NONE;
429da1cc WG	537	}
	538	}
	539	if (isrc & (IRQ_DOI \| IRQ_EI \| IRQ_BEI \| IRQ_EPI \| IRQ_ALI)) {
	540	/* error interrupt */
	541	if (sja1000_err(dev, isrc, status))
	542	break;
	543	}
	544	}
	545
	546	if (priv->post_irq)
255a9154	547	priv->post_irq(priv);
429da1cc WG	548
429da1cc WG	549	if (n >= SJA1000_MAX_IRQ)
aabdfd6a	550	netdev_dbg(dev, "%d messages handled in ISR", n);
429da1cc WG	551
	552	return (n) ? IRQ_HANDLED : IRQ_NONE;
	553	}
	554	EXPORT_SYMBOL_GPL(sja1000_interrupt);
	555
	556	static int sja1000_open(struct net_device *dev)
	557	{
	558	struct sja1000_priv *priv = netdev_priv(dev);
	559	int err;
	560
	561	/* set chip into reset mode */
	562	set_reset_mode(dev);
	563
	564	/* common open */
	565	err = open_candev(dev);
	566	if (err)
	567	return err;
	568
	569	/* register interrupt handler, if not done by the device driver */
	570	if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
4c9ba61e	571	err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
429da1cc WG	572	dev->name, (void *)dev);
429da1cc WG	573	if (err) {
429da1cc	574	close_candev(dev);
128ced8f	575	return -EAGAIN;
429da1cc WG	576	}
	577	}
	578
	579	/* init and start chi */
	580	sja1000_start(dev);
429da1cc	581
a04282f5 FB	582	can_led_event(dev, CAN_LED_EVENT_OPEN);
a04282f5 FB	583
429da1cc WG	584	netif_start_queue(dev);
	585
	586	return 0;
	587	}
	588
	589	static int sja1000_close(struct net_device *dev)
	590	{
	591	struct sja1000_priv *priv = netdev_priv(dev);
	592
	593	netif_stop_queue(dev);
	594	set_reset_mode(dev);
	595
	596	if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
	597	free_irq(dev->irq, (void *)dev);
	598
	599	close_candev(dev);
	600
a04282f5 FB	601	can_led_event(dev, CAN_LED_EVENT_STOP);
a04282f5 FB	602
429da1cc WG	603	return 0;
	604	}
	605
	606	struct net_device *alloc_sja1000dev(int sizeof_priv)
	607	{
	608	struct net_device *dev;
	609	struct sja1000_priv *priv;
	610
a6e4bc53 WG	611	dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
a6e4bc53 WG	612	SJA1000_ECHO_SKB_MAX);
429da1cc WG	613	if (!dev)
	614	return NULL;
	615
	616	priv = netdev_priv(dev);
	617
	618	priv->dev = dev;
	619	priv->can.bittiming_const = &sja1000_bittiming_const;
	620	priv->can.do_set_bittiming = sja1000_set_bittiming;
	621	priv->can.do_set_mode = sja1000_set_mode;
52c793f2 WG	622	priv->can.do_get_berr_counter = sja1000_get_berr_counter;
52c793f2 WG	623	priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES \|
7146b2d9 AL	624	CAN_CTRLMODE_BERR_REPORTING \| CAN_CTRLMODE_LISTENONLY \|
7146b2d9 AL	625	CAN_CTRLMODE_ONE_SHOT;
429da1cc	626
1f01bfd2 OH	627	spin_lock_init(&priv->cmdreg_lock);
1f01bfd2 OH	628
429da1cc WG	629	if (sizeof_priv)
	630	priv->priv = (void *)priv + sizeof(struct sja1000_priv);
	631
	632	return dev;
	633	}
	634	EXPORT_SYMBOL_GPL(alloc_sja1000dev);
	635
	636	void free_sja1000dev(struct net_device *dev)
	637	{
	638	free_candev(dev);
	639	}
	640	EXPORT_SYMBOL_GPL(free_sja1000dev);
	641
	642	static const struct net_device_ops sja1000_netdev_ops = {
	643	.ndo_open = sja1000_open,
	644	.ndo_stop = sja1000_close,
	645	.ndo_start_xmit = sja1000_start_xmit,
	646	};
	647
	648	int register_sja1000dev(struct net_device *dev)
	649	{
a04282f5 FB	650	int ret;
a04282f5 FB	651
429da1cc WG	652	if (!sja1000_probe_chip(dev))
	653	return -ENODEV;
	654
	655	dev->flags \|= IFF_ECHO; /* we support local echo */
	656	dev->netdev_ops = &sja1000_netdev_ops;
	657
	658	set_reset_mode(dev);
	659	chipset_init(dev);
	660
a04282f5 FB	661	ret = register_candev(dev);
	662
	663	if (!ret)
	664	devm_can_led_init(dev);
	665
	666	return ret;
429da1cc WG	667	}
	668	EXPORT_SYMBOL_GPL(register_sja1000dev);
	669
	670	void unregister_sja1000dev(struct net_device *dev)
	671	{
	672	set_reset_mode(dev);
	673	unregister_candev(dev);
	674	}
	675	EXPORT_SYMBOL_GPL(unregister_sja1000dev);
	676
	677	static __init int sja1000_init(void)
	678	{
	679	printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
	680
	681	return 0;
	682	}
	683
	684	module_init(sja1000_init);
	685
	686	static __exit void sja1000_exit(void)
	687	{
	688	printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
	689	}
	690
	691	module_exit(sja1000_exit);