2009-05-15 23:39:30 +00:00
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/*
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* sja1000.c - Philips SJA1000 network device driver
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*
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* Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
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* 38106 Braunschweig, GERMANY
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*
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* Copyright (c) 2002-2007 Volkswagen Group Electronic Research
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Volkswagen nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* Alternatively, provided that this notice is retained in full, this
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* software may be distributed under the terms of the GNU General
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* Public License ("GPL") version 2, in which case the provisions of the
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* GPL apply INSTEAD OF those given above.
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*
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* The provided data structures and external interfaces from this code
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* are not restricted to be used by modules with a GPL compatible license.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* Send feedback to <socketcan-users@lists.berlios.de>
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/interrupt.h>
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#include <linux/ptrace.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/if_ether.h>
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#include <linux/skbuff.h>
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#include <linux/delay.h>
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#include <linux/can.h>
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#include <linux/can/dev.h>
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#include <linux/can/error.h>
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#include "sja1000.h"
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#define DRV_NAME "sja1000"
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MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
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static struct can_bittiming_const sja1000_bittiming_const = {
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.name = DRV_NAME,
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.tseg1_min = 1,
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.tseg1_max = 16,
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.tseg2_min = 1,
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.tseg2_max = 8,
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.sjw_max = 4,
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.brp_min = 1,
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.brp_max = 64,
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.brp_inc = 1,
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};
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static int sja1000_probe_chip(struct net_device *dev)
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{
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struct sja1000_priv *priv = netdev_priv(dev);
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2009-05-30 07:55:49 +00:00
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if (priv->reg_base && (priv->read_reg(priv, 0) == 0xFF)) {
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2009-05-15 23:39:30 +00:00
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printk(KERN_INFO "%s: probing @0x%lX failed\n",
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DRV_NAME, dev->base_addr);
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return 0;
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}
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return -1;
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}
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static void set_reset_mode(struct net_device *dev)
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{
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struct sja1000_priv *priv = netdev_priv(dev);
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2009-05-30 07:55:49 +00:00
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unsigned char status = priv->read_reg(priv, REG_MOD);
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2009-05-15 23:39:30 +00:00
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int i;
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/* disable interrupts */
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2009-05-30 07:55:49 +00:00
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priv->write_reg(priv, REG_IER, IRQ_OFF);
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2009-05-15 23:39:30 +00:00
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for (i = 0; i < 100; i++) {
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/* check reset bit */
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if (status & MOD_RM) {
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priv->can.state = CAN_STATE_STOPPED;
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return;
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}
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2009-05-30 07:55:49 +00:00
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priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */
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2009-05-15 23:39:30 +00:00
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udelay(10);
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2009-05-30 07:55:49 +00:00
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status = priv->read_reg(priv, REG_MOD);
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2009-05-15 23:39:30 +00:00
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}
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dev_err(dev->dev.parent, "setting SJA1000 into reset mode failed!\n");
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}
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static void set_normal_mode(struct net_device *dev)
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{
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struct sja1000_priv *priv = netdev_priv(dev);
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2009-05-30 07:55:49 +00:00
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unsigned char status = priv->read_reg(priv, REG_MOD);
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2009-05-15 23:39:30 +00:00
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int i;
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for (i = 0; i < 100; i++) {
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/* check reset bit */
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if ((status & MOD_RM) == 0) {
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priv->can.state = CAN_STATE_ERROR_ACTIVE;
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/* enable all interrupts */
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2009-05-30 07:55:49 +00:00
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priv->write_reg(priv, REG_IER, IRQ_ALL);
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2009-05-15 23:39:30 +00:00
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return;
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}
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/* set chip to normal mode */
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2009-05-30 07:55:49 +00:00
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priv->write_reg(priv, REG_MOD, 0x00);
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2009-05-15 23:39:30 +00:00
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udelay(10);
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2009-05-30 07:55:49 +00:00
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status = priv->read_reg(priv, REG_MOD);
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2009-05-15 23:39:30 +00:00
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}
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dev_err(dev->dev.parent, "setting SJA1000 into normal mode failed!\n");
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}
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static void sja1000_start(struct net_device *dev)
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{
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struct sja1000_priv *priv = netdev_priv(dev);
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/* leave reset mode */
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if (priv->can.state != CAN_STATE_STOPPED)
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set_reset_mode(dev);
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/* Clear error counters and error code capture */
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2009-05-30 07:55:49 +00:00
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priv->write_reg(priv, REG_TXERR, 0x0);
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priv->write_reg(priv, REG_RXERR, 0x0);
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priv->read_reg(priv, REG_ECC);
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2009-05-15 23:39:30 +00:00
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/* leave reset mode */
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set_normal_mode(dev);
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}
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static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
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{
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struct sja1000_priv *priv = netdev_priv(dev);
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if (!priv->open_time)
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return -EINVAL;
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switch (mode) {
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case CAN_MODE_START:
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sja1000_start(dev);
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if (netif_queue_stopped(dev))
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netif_wake_queue(dev);
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break;
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default:
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static int sja1000_set_bittiming(struct net_device *dev)
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{
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struct sja1000_priv *priv = netdev_priv(dev);
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struct can_bittiming *bt = &priv->can.bittiming;
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u8 btr0, btr1;
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btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
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btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
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(((bt->phase_seg2 - 1) & 0x7) << 4);
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if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
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btr1 |= 0x80;
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dev_info(dev->dev.parent,
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"setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
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2009-05-30 07:55:49 +00:00
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priv->write_reg(priv, REG_BTR0, btr0);
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priv->write_reg(priv, REG_BTR1, btr1);
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2009-05-15 23:39:30 +00:00
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return 0;
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}
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/*
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* initialize SJA1000 chip:
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* - reset chip
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* - set output mode
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* - set baudrate
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* - enable interrupts
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* - start operating mode
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*/
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static void chipset_init(struct net_device *dev)
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{
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struct sja1000_priv *priv = netdev_priv(dev);
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/* set clock divider and output control register */
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2009-05-30 07:55:49 +00:00
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priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN);
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2009-05-15 23:39:30 +00:00
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/* set acceptance filter (accept all) */
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2009-05-30 07:55:49 +00:00
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priv->write_reg(priv, REG_ACCC0, 0x00);
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priv->write_reg(priv, REG_ACCC1, 0x00);
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priv->write_reg(priv, REG_ACCC2, 0x00);
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priv->write_reg(priv, REG_ACCC3, 0x00);
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2009-05-15 23:39:30 +00:00
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2009-05-30 07:55:49 +00:00
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priv->write_reg(priv, REG_ACCM0, 0xFF);
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priv->write_reg(priv, REG_ACCM1, 0xFF);
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priv->write_reg(priv, REG_ACCM2, 0xFF);
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priv->write_reg(priv, REG_ACCM3, 0xFF);
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2009-05-15 23:39:30 +00:00
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2009-05-30 07:55:49 +00:00
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priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL);
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2009-05-15 23:39:30 +00:00
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}
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/*
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* transmit a CAN message
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* message layout in the sk_buff should be like this:
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* xx xx xx xx ff ll 00 11 22 33 44 55 66 77
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* [ can-id ] [flags] [len] [can data (up to 8 bytes]
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*/
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2009-08-31 19:50:58 +00:00
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static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
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struct net_device *dev)
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2009-05-15 23:39:30 +00:00
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{
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struct sja1000_priv *priv = netdev_priv(dev);
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struct can_frame *cf = (struct can_frame *)skb->data;
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uint8_t fi;
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uint8_t dlc;
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canid_t id;
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uint8_t dreg;
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int i;
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netif_stop_queue(dev);
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fi = dlc = cf->can_dlc;
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id = cf->can_id;
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if (id & CAN_RTR_FLAG)
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fi |= FI_RTR;
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if (id & CAN_EFF_FLAG) {
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fi |= FI_FF;
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dreg = EFF_BUF;
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2009-05-30 07:55:49 +00:00
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priv->write_reg(priv, REG_FI, fi);
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priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
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priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
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priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
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priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
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2009-05-15 23:39:30 +00:00
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} else {
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dreg = SFF_BUF;
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2009-05-30 07:55:49 +00:00
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priv->write_reg(priv, REG_FI, fi);
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priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
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priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
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2009-05-15 23:39:30 +00:00
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}
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for (i = 0; i < dlc; i++)
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2009-05-30 07:55:49 +00:00
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priv->write_reg(priv, dreg++, cf->data[i]);
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2009-05-15 23:39:30 +00:00
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dev->trans_start = jiffies;
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can_put_echo_skb(skb, dev, 0);
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2009-05-30 07:55:49 +00:00
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priv->write_reg(priv, REG_CMR, CMD_TR);
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2009-05-15 23:39:30 +00:00
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2009-06-23 06:03:08 +00:00
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return NETDEV_TX_OK;
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2009-05-15 23:39:30 +00:00
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}
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static void sja1000_rx(struct net_device *dev)
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{
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struct sja1000_priv *priv = netdev_priv(dev);
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struct net_device_stats *stats = &dev->stats;
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struct can_frame *cf;
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struct sk_buff *skb;
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uint8_t fi;
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uint8_t dreg;
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canid_t id;
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uint8_t dlc;
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int i;
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skb = dev_alloc_skb(sizeof(struct can_frame));
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if (skb == NULL)
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return;
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skb->dev = dev;
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skb->protocol = htons(ETH_P_CAN);
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2009-05-30 07:55:49 +00:00
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fi = priv->read_reg(priv, REG_FI);
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2009-05-15 23:39:30 +00:00
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dlc = fi & 0x0F;
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if (fi & FI_FF) {
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/* extended frame format (EFF) */
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dreg = EFF_BUF;
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2009-05-30 07:55:49 +00:00
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id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
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| (priv->read_reg(priv, REG_ID2) << (5 + 8))
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| (priv->read_reg(priv, REG_ID3) << 5)
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| (priv->read_reg(priv, REG_ID4) >> 3);
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2009-05-15 23:39:30 +00:00
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id |= CAN_EFF_FLAG;
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} else {
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/* standard frame format (SFF) */
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dreg = SFF_BUF;
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2009-05-30 07:55:49 +00:00
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id = (priv->read_reg(priv, REG_ID1) << 3)
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| (priv->read_reg(priv, REG_ID2) >> 5);
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2009-05-15 23:39:30 +00:00
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}
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if (fi & FI_RTR)
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id |= CAN_RTR_FLAG;
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cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
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memset(cf, 0, sizeof(struct can_frame));
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|
|
cf->can_id = id;
|
|
|
|
cf->can_dlc = dlc;
|
|
|
|
for (i = 0; i < dlc; i++)
|
2009-05-30 07:55:49 +00:00
|
|
|
cf->data[i] = priv->read_reg(priv, dreg++);
|
2009-05-15 23:39:30 +00:00
|
|
|
|
|
|
|
while (i < 8)
|
|
|
|
cf->data[i++] = 0;
|
|
|
|
|
|
|
|
/* release receive buffer */
|
2009-05-30 07:55:49 +00:00
|
|
|
priv->write_reg(priv, REG_CMR, CMD_RRB);
|
2009-05-15 23:39:30 +00:00
|
|
|
|
|
|
|
netif_rx(skb);
|
|
|
|
|
|
|
|
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++;
|
2009-05-30 07:55:49 +00:00
|
|
|
priv->write_reg(priv, REG_CMR, CMD_CDO); /* clear bit */
|
2009-05-15 23:39:30 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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++;
|
|
|
|
|
2009-05-30 07:55:49 +00:00
|
|
|
ecc = priv->read_reg(priv, REG_ECC);
|
2009-05-15 23:39:30 +00:00
|
|
|
|
|
|
|
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");
|
2009-05-30 07:55:49 +00:00
|
|
|
alc = priv->read_reg(priv, REG_ALC);
|
2009-05-15 23:39:30 +00:00
|
|
|
priv->can.can_stats.arbitration_lost++;
|
2009-09-01 05:29:41 +00:00
|
|
|
stats->tx_errors++;
|
2009-05-15 23:39:30 +00:00
|
|
|
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)) {
|
2009-05-30 07:55:49 +00:00
|
|
|
uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
|
|
|
|
uint8_t txerr = priv->read_reg(priv, REG_TXERR);
|
2009-05-15 23:39:30 +00:00
|
|
|
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);
|
|
|
|
|
|
|
|
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? */
|
2009-05-30 07:55:49 +00:00
|
|
|
if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
|
2009-05-15 23:39:30 +00:00
|
|
|
return IRQ_NONE;
|
|
|
|
|
|
|
|
if (priv->pre_irq)
|
2009-05-30 07:55:49 +00:00
|
|
|
priv->pre_irq(priv);
|
2009-05-15 23:39:30 +00:00
|
|
|
|
2009-05-30 07:55:49 +00:00
|
|
|
while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
|
2009-05-15 23:39:30 +00:00
|
|
|
n++;
|
2009-05-30 07:55:49 +00:00
|
|
|
status = priv->read_reg(priv, REG_SR);
|
2009-05-15 23:39:30 +00:00
|
|
|
|
|
|
|
if (isrc & IRQ_WUI)
|
|
|
|
dev_warn(dev->dev.parent, "wakeup interrupt\n");
|
|
|
|
|
|
|
|
if (isrc & IRQ_TI) {
|
|
|
|
/* transmission complete interrupt */
|
2009-09-01 05:29:41 +00:00
|
|
|
stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf;
|
2009-05-15 23:39:30 +00:00
|
|
|
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);
|
2009-05-30 07:55:49 +00:00
|
|
|
status = priv->read_reg(priv, REG_SR);
|
2009-05-15 23:39:30 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
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)
|
2009-05-30 07:55:49 +00:00
|
|
|
priv->post_irq(priv);
|
2009-05-15 23:39:30 +00:00
|
|
|
|
|
|
|
if (n >= SJA1000_MAX_IRQ)
|
|
|
|
dev_dbg(dev->dev.parent, "%d messages handled in ISR", n);
|
|
|
|
|
|
|
|
return (n) ? IRQ_HANDLED : IRQ_NONE;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(sja1000_interrupt);
|
|
|
|
|
|
|
|
static int sja1000_open(struct net_device *dev)
|
|
|
|
{
|
|
|
|
struct sja1000_priv *priv = netdev_priv(dev);
|
|
|
|
int err;
|
|
|
|
|
|
|
|
/* set chip into reset mode */
|
|
|
|
set_reset_mode(dev);
|
|
|
|
|
|
|
|
/* common open */
|
|
|
|
err = open_candev(dev);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
/* register interrupt handler, if not done by the device driver */
|
|
|
|
if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
|
|
|
|
err = request_irq(dev->irq, &sja1000_interrupt, priv->irq_flags,
|
|
|
|
dev->name, (void *)dev);
|
|
|
|
if (err) {
|
|
|
|
close_candev(dev);
|
2009-05-30 07:55:48 +00:00
|
|
|
return -EAGAIN;
|
2009-05-15 23:39:30 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* 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);
|