pip.c

PCM9880是一块PC/104界面的双端口隔离CAN总线通讯卡

/* pip.c
 * Linux CAN-bus device driver.
 * Written by Arnaud Westenberg email:[e-mail]
 * This software is released under the GPL-License.
 * Version 0.7  6 Aug 2001
 */ 

#include <linux/autoconf.h>
#if defined (CONFIG_MODVERSIONS) && !defined (MODVERSIONS)
#define MODVERSIONS
#endif

#if defined (MODVERSIONS)
#include <linux/modversions.h>
#endif

#include <linux/ioport.h>
#include <linux/delay.h>
#include <asm/errno.h>
#include <asm/io.h>

#include "../include/main.h"
#include "../include/pip.h"
#include "../include/i82527.h"

int pip5_request_io(unsigned long io_addr)
{
	if (io_addr != 0x8000) {
		CANMSG("Invalid base io address\n");
		CANMSG("The PIP5 uses a fixed base address of 0x8000,\n");
		CANMSG("please consult your user manual.\n");
		return -ENODEV;
	}
	if (check_region(io_addr,0x100)) {
		CANMSG("Unable to open port: 0x%lx\n",io_addr);
		return -ENODEV;
	}
	else if(check_region(io_addr+0x102,0x01)) {
		CANMSG("Unable to open port: 0x%lx\n",io_addr+0x102);
		return -ENODEV;
	}
	else {
		request_region(io_addr,0x100,DEVICE_NAME);
		DEBUGMSG("Registered IO-memory: 0x%lx - 0x%lx\n", io_addr, io_addr + 0x100 - 1);
		request_region(io_addr+0x102,0x01,DEVICE_NAME);
		DEBUGMSG("Registered IO-memory: 0x%lx\n", io_addr+0x102);
	}
	return 0;
}

int pip6_request_io(unsigned long io_addr)
{
	if ( (io_addr != 0x1000)&&(io_addr != 0x8000)&&(io_addr != 0xe000)) {
		CANMSG("Invalid base io address\n");
		CANMSG("Valid values for the PIP6 are: 0x1000, 0x8000 or 0xe000\n");
		CANMSG("Please consult your user manual.\n");
		return -ENODEV;
	}
	if (check_region(io_addr,0x100)) {
		CANMSG("Unable to open port: 0x%lx\n",io_addr);
		return -ENODEV;
	}
	else if (check_region(0x804, 0x02)) {
		CANMSG("Unable to open port: 0x%x\n", 0x804);
		return -ENODEV;
	}
	else {
		request_region(io_addr,0x100, DEVICE_NAME);
		DEBUGMSG("Registered IO-memory: 0x%lx - 0x%lx\n", io_addr, io_addr + 0x100 -1);
		request_region(0x804,0x02,DEVICE_NAME);
		DEBUGMSG("Registered IO-memory : 0x%x - 0x%x\n",0x804,0x805);
	}
	return 0;
}

int pip5_release_io(unsigned long io_addr)
{
	release_region(io_addr,0x100);
	release_region(io_addr+0x102,0x01);

	return 0;
}

int pip6_release_io(unsigned long io_addr)
{
	release_region(io_addr,0x100);
	release_region(0x804,0x02);

	return 0;
}

int pip_reset(int card)
{
	int i=0, res_value=0;

	DEBUGMSG("Resetting %s hardware ...\n", candevices_p[card]->hwname);
	if (!strcmp(candevices_p[card]->hwname,"pip5"))
		res_value = 0xcf;
	else
		res_value = 0x01;
	while (i < 1000000) {
		i++;
		outb(res_value,candevices_p[card]->res_addr);
	}
	outb(0x0,candevices_p[card]->res_addr);

	/* Check hardware reset status */
	i=0;
	while ( (inb(candevices_p[card]->io_addr+iCPU) & iCPU_RST) && (i<=15)) {
		udelay(20000);
		i++;
	}
	if (i>=15) {
		CANMSG("Reset status timeout!\n");
		CANMSG("Please check your hardware.\n");
		return -ENODEV;
	}
	else
		DEBUGMSG("Chip0 reset status ok.\n");
	

	return 0;
}

int pip_init_hw_data(int card) 
{
	if (!strcmp(candevices_p[card]->hwname,"pip5"))
		candevices_p[card]->res_addr=candevices_p[card]->io_addr+0x102;
	else
		candevices_p[card]->res_addr=0x805;
	candevices_p[card]->nr_82527_chips=1;
	candevices_p[card]->nr_sja1000_chips=0;
	candevices_p[card]->flags |= PROGRAMMABLE_IRQ;

	return 0;
}

int pip_init_chip_data(int card, int chipnr)
{
	candevices_p[card]->chip[chipnr]->chip_type="i82527";
	candevices_p[card]->chip[chipnr]->chip_base_addr=candevices_p[card]->io_addr;
	candevices_p[card]->chip[chipnr]->clock = 16000000;
	if (!strcmp(candevices_p[card]->hwname,"pip5"))
		candevices_p[card]->chip[chipnr]->int_cpu_reg = iCPU_DSC;
	else
		candevices_p[card]->chip[chipnr]->int_cpu_reg = 0x0;
	candevices_p[card]->chip[chipnr]->int_clk_reg = iCLK_SL1;
	candevices_p[card]->chip[chipnr]->int_bus_reg = iBUS_CBY;
	candevices_p[card]->chip[chipnr]->sja_cdr_reg = 0;
	candevices_p[card]->chip[chipnr]->sja_ocr_reg = 0;

	return 0;
}

int pip_init_obj_data(int chipnr, int objnr)
{
	chips_p[chipnr]->msgobj[objnr]->obj_base_addr=chips_p[chipnr]->chip_base_addr+(objnr+1)*0x10;
	chips_p[chipnr]->msgobj[objnr]->flags=0;
	
	return 0;
}

int pip5_program_irq(int card)
{
	outb(0x01, candevices_p[card]->res_addr);
	switch (candevices_p[card]->chip[0]->chip_irq) {
		case  3: { outb(0x03, candevices_p[card]->res_addr); break; }
		case  4: { outb(0x05, candevices_p[card]->res_addr); break; }
		case  5: { outb(0x07, candevices_p[card]->res_addr); break; }
		case 10: { outb(0x09, candevices_p[card]->res_addr); break; }
		case 11: { outb(0x0c, candevices_p[card]->res_addr); break; }
		case 15: { outb(0x0d, candevices_p[card]->res_addr); break; }
		default: {
		CANMSG("Supplied interrupt is not supported by the hardware\n");
		CANMSG("Please consult your user manual.\n");
		return -ENODEV;
		}
	}
	outb(0x00, candevices_p[card]->res_addr);

	return 0;
}

int pip6_program_irq(int card)
{
	unsigned char can_int = 0, can_addr = 0;

	can_int = candevices_p[card]->chip[0]->chip_irq;
	if ((can_int != 3) && (can_int != 4) && (can_int != 5) && (can_int != 6)
		&& (can_int != 7) && (can_int != 9) && (can_int != 10) && 
		(can_int != 11) && (can_int != 12) && (can_int != 14) && 
		(can_int != 15)) {
		CANMSG("Invalid interrupt number\n");
		CANMSG("Valid interrupt numbers for the PIP6: 3,4,5,6,7,9,10,11,12,14 or 15\n");
		CANMSG("Please consult your user manual.\n");
		return -ENODEV;
	}
	switch (candevices_p[card]->io_addr) {
		case 0x1000: { can_addr = 0x01; break; }
		case 0x8000: { can_addr = 0x02; break; }
		case 0xe000: { can_addr = 0x03; break; }
		default: {
		CANMSG("Supplied io address is not valid, please check your manual\n");
		return -ENODEV;
		}
	}
	outb( (can_int<<4)|can_addr, 0x804);

	return 0;
}

void pip_write_register(unsigned char data, unsigned long address)
{
	outb(data,address);
}

unsigned pip_read_register(unsigned long address)
{
	return inb(address);
}

/* !!! Don't change these functions !!! */
int pip5_register(struct hwspecops_t *hwspecops)
{
	hwspecops->request_io = pip5_request_io;
	hwspecops->release_io = pip5_release_io;
	hwspecops->reset = pip_reset;
	hwspecops->init_hw_data = pip_init_hw_data;
	hwspecops->init_chip_data = pip_init_chip_data;
	hwspecops->init_obj_data = pip_init_obj_data;
	hwspecops->write_register = pip_write_register;
	hwspecops->read_register = pip_read_register;
	hwspecops->program_irq = pip5_program_irq;
	return 0;
}

int pip6_register(struct hwspecops_t *hwspecops)
{
	hwspecops->request_io = pip6_request_io;
	hwspecops->release_io = pip6_release_io;
	hwspecops->reset = pip_reset;
	hwspecops->init_hw_data = pip_init_hw_data;
	hwspecops->init_chip_data = pip_init_chip_data;
	hwspecops->init_obj_data = pip_init_obj_data;
	hwspecops->write_register = pip_write_register;
	hwspecops->read_register = pip_read_register;
	hwspecops->program_irq = pip6_program_irq;
	return 0;
}