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can: Driver for the SJA1000 CAN controller

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This patch adds the generic Socket-CAN driver for the Philips SJA1000
full CAN controller.

Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wolfgang Grandegger 2009-05-15 23:39:30 +00:00 committed by David S. Miller
parent 39549eef35
commit 429da1cc84
5 changed files with 832 additions and 0 deletions
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6
drivers/net/can/Kconfig
View File

@ -35,6 +35,12 @@ config CAN_CALC_BITTIMING
arguments "tq", "prop_seg", "phase_seg1", "phase_seg2" and "sjw".
If unsure, say Y.
config CAN_SJA1000
depends on CAN_DEV
tristate "Philips SJA1000"
---help---
Driver for the SJA1000 CAN controllers from Philips or NXP
config CAN_DEBUG_DEVICES
bool "CAN devices debugging messages"
depends on CAN

2
drivers/net/can/Makefile
View File

@ -7,4 +7,6 @@ obj-$(CONFIG_CAN_VCAN) += vcan.o
obj-$(CONFIG_CAN_DEV) += can-dev.o
can-dev-y := dev.o
obj-$(CONFIG_CAN_SJA1000) += sja1000/
ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG

7
drivers/net/can/sja1000/Makefile Normal file
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@ -0,0 +1,7 @@
#
# Makefile for the SJA1000 CAN controller drivers.
#
obj-$(CONFIG_CAN_SJA1000) += sja1000.o
ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG

637
drivers/net/can/sja1000/sja1000.c Normal file
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@ -0,0 +1,637 @@
/*
* 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.h>
#include <linux/can/dev.h>
#include <linux/can/error.h>
#include <linux/can/dev.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 (dev->base_addr && (priv->read_reg(dev, 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(dev, REG_MOD);
int i;
/* disable interrupts */
priv->write_reg(dev, 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(dev, REG_MOD, MOD_RM); /* reset chip */
udelay(10);
status = priv->read_reg(dev, 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(dev, 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 all interrupts */
priv->write_reg(dev, REG_IER, IRQ_ALL);
return;
}
/* set chip to normal mode */
priv->write_reg(dev, REG_MOD, 0x00);
udelay(10);
status = priv->read_reg(dev, 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(dev, REG_TXERR, 0x0);
priv->write_reg(dev, REG_RXERR, 0x0);
priv->read_reg(dev, 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(dev, REG_BTR0, btr0);
priv->write_reg(dev, REG_BTR1, btr1);
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(dev, REG_CDR, priv->cdr | CDR_PELICAN);
/* set acceptance filter (accept all) */
priv->write_reg(dev, REG_ACCC0, 0x00);
priv->write_reg(dev, REG_ACCC1, 0x00);
priv->write_reg(dev, REG_ACCC2, 0x00);
priv->write_reg(dev, REG_ACCC3, 0x00);
priv->write_reg(dev, REG_ACCM0, 0xFF);
priv->write_reg(dev, REG_ACCM1, 0xFF);
priv->write_reg(dev, REG_ACCM2, 0xFF);
priv->write_reg(dev, REG_ACCM3, 0xFF);
priv->write_reg(dev, 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 int sja1000_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct sja1000_priv *priv = netdev_priv(dev);
struct net_device_stats *stats = &dev->stats;
struct can_frame *cf = (struct can_frame *)skb->data;
uint8_t fi;
uint8_t dlc;
canid_t id;
uint8_t dreg;
int i;
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(dev, REG_FI, fi);
priv->write_reg(dev, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
priv->write_reg(dev, REG_ID2, (id & 0x001fe000) >> (5 + 8));
priv->write_reg(dev, REG_ID3, (id & 0x00001fe0) >> 5);
priv->write_reg(dev, REG_ID4, (id & 0x0000001f) << 3);
} else {
dreg = SFF_BUF;
priv->write_reg(dev, REG_FI, fi);
priv->write_reg(dev, REG_ID1, (id & 0x000007f8) >> 3);
priv->write_reg(dev, REG_ID2, (id & 0x00000007) << 5);
}
for (i = 0; i < dlc; i++)
priv->write_reg(dev, dreg++, cf->data[i]);
stats->tx_bytes += dlc;
dev->trans_start = jiffies;
can_put_echo_skb(skb, dev, 0);
priv->write_reg(dev, REG_CMR, CMD_TR);
return 0;
}
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;
uint8_t dlc;
int i;
skb = dev_alloc_skb(sizeof(struct can_frame));
if (skb == NULL)
return;
skb->dev = dev;
skb->protocol = htons(ETH_P_CAN);
fi = priv->read_reg(dev, REG_FI);
dlc = fi & 0x0F;
if (fi & FI_FF) {
/* extended frame format (EFF) */
dreg = EFF_BUF;
id = (priv->read_reg(dev, REG_ID1) << (5 + 16))
| (priv->read_reg(dev, REG_ID2) << (5 + 8))
| (priv->read_reg(dev, REG_ID3) << 5)
| (priv->read_reg(dev, REG_ID4) >> 3);
id |= CAN_EFF_FLAG;
} else {
/* standard frame format (SFF) */
dreg = SFF_BUF;
id = (priv->read_reg(dev, REG_ID1) << 3)
| (priv->read_reg(dev, REG_ID2) >> 5);
}
if (fi & FI_RTR)
id |= CAN_RTR_FLAG;
cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
memset(cf, 0, sizeof(struct can_frame));
cf->can_id = id;
cf->can_dlc = dlc;
for (i = 0; i < dlc; i++)
cf->data[i] = priv->read_reg(dev, dreg++);
while (i < 8)
cf->data[i++] = 0;
/* release receive buffer */
priv->write_reg(dev, REG_CMR, CMD_RRB);
netif_rx(skb);
dev->last_rx = jiffies;
stats->rx_packets++;
stats->rx_bytes += 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 = dev_alloc_skb(sizeof(struct can_frame));
if (skb == NULL)
return -ENOMEM;
skb->dev = dev;
skb->protocol = htons(ETH_P_CAN);
cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
memset(cf, 0, sizeof(struct can_frame));
cf->can_id = CAN_ERR_FLAG;
cf->can_dlc = CAN_ERR_DLC;
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(dev, 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(dev, 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(dev, REG_ALC);
priv->can.can_stats.arbitration_lost++;
stats->rx_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(dev, REG_RXERR);
uint8_t txerr = priv->read_reg(dev, 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;
}
}
priv->can.state = state;
netif_rx(skb);
dev->last_rx = jiffies;
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(dev, REG_IER) == IRQ_OFF)
return IRQ_NONE;
if (priv->pre_irq)
priv->pre_irq(dev);
while ((isrc = priv->read_reg(dev, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
n++;
status = priv->read_reg(dev, REG_SR);
if (isrc & IRQ_WUI)
dev_warn(dev->dev.parent, "wakeup interrupt\n");
if (isrc & IRQ_TI) {
/* transmission complete interrupt */
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(dev, 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(dev);
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) {
return -EAGAIN;
close_candev(dev);
}
}
/* 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);
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;
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);

180
drivers/net/can/sja1000/sja1000.h Normal file
View File

@ -0,0 +1,180 @@
/*
* sja1000.h - 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>
*
*/
#ifndef SJA1000_DEV_H
#define SJA1000_DEV_H
#include <linux/can/dev.h>
#include <linux/can/platform/sja1000.h>
#define SJA1000_MAX_IRQ 20 /* max. number of interrupts handled in ISR */
/* SJA1000 registers - manual section 6.4 (Pelican Mode) */
#define REG_MOD 0x00
#define REG_CMR 0x01
#define REG_SR 0x02
#define REG_IR 0x03
#define REG_IER 0x04
#define REG_ALC 0x0B
#define REG_ECC 0x0C
#define REG_EWL 0x0D
#define REG_RXERR 0x0E
#define REG_TXERR 0x0F
#define REG_ACCC0 0x10
#define REG_ACCC1 0x11
#define REG_ACCC2 0x12
#define REG_ACCC3 0x13
#define REG_ACCM0 0x14
#define REG_ACCM1 0x15
#define REG_ACCM2 0x16
#define REG_ACCM3 0x17
#define REG_RMC 0x1D
#define REG_RBSA 0x1E
/* Common registers - manual section 6.5 */
#define REG_BTR0 0x06
#define REG_BTR1 0x07
#define REG_OCR 0x08
#define REG_CDR 0x1F
#define REG_FI 0x10
#define SFF_BUF 0x13
#define EFF_BUF 0x15
#define FI_FF 0x80
#define FI_RTR 0x40
#define REG_ID1 0x11
#define REG_ID2 0x12
#define REG_ID3 0x13
#define REG_ID4 0x14
#define CAN_RAM 0x20
/* mode register */
#define MOD_RM 0x01
#define MOD_LOM 0x02
#define MOD_STM 0x04
#define MOD_AFM 0x08
#define MOD_SM 0x10
/* commands */
#define CMD_SRR 0x10
#define CMD_CDO 0x08
#define CMD_RRB 0x04
#define CMD_AT 0x02
#define CMD_TR 0x01
/* interrupt sources */
#define IRQ_BEI 0x80
#define IRQ_ALI 0x40
#define IRQ_EPI 0x20
#define IRQ_WUI 0x10
#define IRQ_DOI 0x08
#define IRQ_EI 0x04
#define IRQ_TI 0x02
#define IRQ_RI 0x01
#define IRQ_ALL 0xFF
#define IRQ_OFF 0x00
/* status register content */
#define SR_BS 0x80
#define SR_ES 0x40
#define SR_TS 0x20
#define SR_RS 0x10
#define SR_TCS 0x08
#define SR_TBS 0x04
#define SR_DOS 0x02
#define SR_RBS 0x01
#define SR_CRIT (SR_BS|SR_ES)
/* ECC register */
#define ECC_SEG 0x1F
#define ECC_DIR 0x20
#define ECC_ERR 6
#define ECC_BIT 0x00
#define ECC_FORM 0x40
#define ECC_STUFF 0x80
#define ECC_MASK 0xc0
/*
* Flags for sja1000priv.flags
*/
#define SJA1000_CUSTOM_IRQ_HANDLER 0x1
/*
* SJA1000 private data structure
*/
struct sja1000_priv {
struct can_priv can; /* must be the first member */
int open_time;
struct sk_buff *echo_skb;
/* the lower-layer is responsible for appropriate locking */
u8 (*read_reg) (const struct net_device *dev, int reg);
void (*write_reg) (const struct net_device *dev, int reg, u8 val);
void (*pre_irq) (const struct net_device *dev);
void (*post_irq) (const struct net_device *dev);
void *priv; /* for board-specific data */
struct net_device *dev;
unsigned long irq_flags; /* for request_irq() */
u16 flags; /* custom mode flags */
u8 ocr; /* output control register */
u8 cdr; /* clock divider register */
};
struct net_device *alloc_sja1000dev(int sizeof_priv);
void free_sja1000dev(struct net_device *dev);
int register_sja1000dev(struct net_device *dev);
void unregister_sja1000dev(struct net_device *dev);
irqreturn_t sja1000_interrupt(int irq, void *dev_id);
#endif /* SJA1000_DEV_H */