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/*
* io.c - linear register access CAN hardware abstraction layer
*
* Inspired by the OCAN driver http://ar.linux.it/software/#ocan
*
* 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/netdevice.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include "hal.h"
/* init the HAL - call at driver module init */
int hal_init(void) { return 0; }
/* exit the HAL - call at driver module exit */
int hal_exit(void) { return 0; }
/* get name of this CAN HAL */
char *hal_name(void) { return "io"; }
/* fill arrays base[] and irq[] with HAL specific defaults */
void hal_use_defaults(void)
{
extern unsigned long base[];
extern unsigned int irq[];
base[0] = 0x2C0UL;
irq[0] = 10;
base[1] = 0x320UL;
irq[1] = 5;
}
/* request controller register access space */
int hal_request_region(int dev_num,
unsigned int num_regs,
char *drv_name)
{
extern unsigned long base[];
extern unsigned long rbase[];
/* set for device base_addr */
rbase[dev_num] = base[dev_num];
/* creating the region for IO is pretty easy */
return (request_region(base[dev_num], num_regs, drv_name))? 1 : 0;
}
/* release controller register access space */
void hal_release_region(int dev_num,
unsigned int num_regs)
{
extern unsigned long base[];
release_region(base[dev_num], num_regs);
}
/* enable non controller hardware (e.g. irq routing, etc.) */
int hw_attach(int dev_num) { return 0; }
/* disable non controller hardware (e.g. irq routing, etc.) */
int hw_detach(int dev_num) { return 0; }
/* reset controller hardware (with specific non controller hardware) */
int hw_reset_dev(int dev_num) { return 0; }
/* read from controller register */
u8 hw_readreg(unsigned long base, int reg) {
return inb(base + reg);
}
/* write to controller register */
void hw_writereg(unsigned long base, int reg, u8 val) {
outb(val, base + reg);
}
/* hardware specific work to do at start of irq handler */
void hw_preirq(struct net_device *dev) { return; }
/* hardware specific work to do at end of irq handler */
void hw_postirq(struct net_device *dev) { return; }
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