/* ssv.c * Linux CAN-bus device driver. * Written by Arnaud Westenberg email:arnaud@casema.net * This software is released under the GPL-License. * Version 0.6  18 Sept 2000 */ #include <linux/autoconf.h>#if defined (CONFIG_MODVERSIONS) && !defined (MODVERSIONS)#define MODVERSIONS#endif#ifdef MODVERSIONS#include <linux/modversions.h>#endif#include <linux/ioport.h>#include <linux/delay.h>#include <asm/errno.h>#include <asm/io.h>#include <asm/irq.h>#include "../include/main.h"#include "../include/ssv.h"#include "../include/i82527.h"int ssvcan_irq[2]={-1,-1};unsigned long ssvcan_base=0x0;/* IO_RANGE is the io-memory range that gets reserved, please adjust according * your hardware. Example: #define IO_RANGE 0x100 for i82527 chips or * #define IO_RANGE 0x20 for sja1000 chips. */#define IO_RANGE 0x04/* The function template_request_io is used to reserve the io-memory. If your * hardware uses a dedicated memory range as hardware control registers you * will have to add the code to reserve this memory as well. * The reserved memory starts at io_addr, wich is the module parameter io. */int ssv_request_io(unsigned long io_addr){	if (check_region(io_addr,IO_RANGE)) {		CANMSG("Unable to open port: 0x%lx\n",io_addr);		return -ENODEV;	}	else {		request_region(io_addr,IO_RANGE,DEVICE_NAME);		DEBUGMSG("Registered IO-memory: 0x%lx - 0x%lx\n", io_addr, 			 io_addr + IO_RANGE - 1);	}	return 0;}/* The function template_release_io is used to free the previously reserved  * io-memory. In case you reserved more memory, don't forget to free it here. */int ssv_release_io(unsigned long io_addr){	release_region(io_addr,IO_RANGE);	return 0;}/* The function template_reset is used to give a hardware reset. This is rather * hardware specific so I haven't included example code. Don't forget to check * the reset status of the chip before returning. */int ssv_reset(int card){    int i;     DEBUGMSG("Resetting ssv hardware ...\n");    ssv_write_register(1,ssvcan_base+iCPU);    ssv_write_register(0,ssvcan_base+iCPU);    ssv_write_register(1,ssvcan_base+0x100+iCPU);    ssv_write_register(0,ssvcan_base+0x100+iCPU);    for (i = 1; i < 1000; i++)	udelay (1000);    /* Check hardware reset status */     i=0;    while ( (ssv_read_register(ssvcan_base+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");    /* Check hardware reset status */     i=0;    while ( (ssv_read_register(ssvcan_base+0x100+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("Chip1 reset status ok.\n");    return 0;}/* The function template_init_hw_data is used to initialize the hardware * structure containing information about the installed CAN-board. * RESET_ADDR represents the io-address of the hardware reset register. * NR_82527 represents the number of intel 82527 chips on the board. * NR_SJA1000 represents the number of philips sja1000 chips on the board. * The flags entry can currently only be PROGRAMMABLE_IRQ to indicate that * the hardware uses programmable interrupts. */#define RESET_ADDR 0x02#define NR_82527 2#define NR_SJA1000 0int ssv_init_hw_data(int card) {    candevices_p[card]->res_addr=RESET_ADDR;    candevices_p[card]->nr_82527_chips=NR_82527;    candevices_p[card]->nr_sja1000_chips=0;    candevices_p[card]->flags |= PROGRAMMABLE_IRQ;    return 0;}/* The function template_init_chip_data is used to initialize the hardware * structure containing information about the CAN chips. * CHIP_TYPE represents the type of CAN chip. CHIP_TYPE can be "i82527" or * "sja1000". * The chip_base_addr entry represents the start of the 'official' memory map * of the installed chip. It's likely that this is the same as the io_addr * argument supplied at module loading time. * The clock argument holds the chip clock value in Hz. */#define CHIP_TYPE "i82527"int ssv_init_chip_data(int card, int chipnr){    candevices_p[card]->chip[chipnr]->chip_type=CHIP_TYPE;    candevices_p[card]->chip[chipnr]->chip_base_addr=	candevices_p[card]->io_addr+0x100*chipnr;    candevices_p[card]->chip[chipnr]->clock = 16000000;    ssvcan_irq[chipnr]=candevices_p[card]->chip[chipnr]->chip_irq;    ssvcan_base=candevices_p[card]->io_addr;    candevices_p[card]->chip[chipnr]->int_cpu_reg = iCPU_DSC;    candevices_p[card]->chip[chipnr]->int_clk_reg = iCLK_SL1;    candevices_p[card]->chip[chipnr]->int_bus_reg = iBUS_CBY;    return 0;} /* The function template_init_obj_data is used to initialize the hardware * structure containing information about the different message objects on the * CAN chip. In case of the sja1000 there's only one message object but on the * i82527 chip there are 15. * The code below is for a i82527 chip and initializes the object base addresses * The entry obj_base_addr represents the first memory address of the message  * object. In case of the sja1000 obj_base_addr is taken the same as the chips * base address. * Unless the hardware uses a segmented memory map, flags can be set zero. */int ssv_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;}/* The function template_program_irq is used for hardware that uses programmable * interrupts. If your hardware doesn't use programmable interrupts you should * not set the candevices_t->flags entry to PROGRAMMABLE_IRQ and leave this * function unedited. Again this function is hardware specific so there's no * example code. */int ssv_program_irq(int card){    return 0;}/* The function template_write_register is used to write to hardware registers * on the CAN chip. You should only have to edit this function if your hardware * uses some specific write process. */void ssv_write_register(unsigned char data, unsigned long address){    /* address is an absolute address */    /* the ssv card has two registers, the address register at 0x0       and the data register at 0x01 */    /* write the relative address on the eight LSB bits      and the data on the eight MSB bits in one time */    if((address-ssvcan_base)<0x100)	outw(address-ssvcan_base + (256 * data), ssvcan_base);    else	outw(address-ssvcan_base-0x100 + (256 * data), ssvcan_base+0x02);}/* The function template_read_register is used to read from hardware registers * on the CAN chip. You should only have to edit this function if your hardware * uses some specific read process. */unsigned ssv_read_register(unsigned long address){    /* this is the same thing that the function write_register.       We use the two register, we write the address where we        want to read in a first time. In a second time we read the       data */    unsigned char ret;        if((address-ssvcan_base)<0x100)    {	disable_irq(ssvcan_irq[0]);	outb(address-ssvcan_base, ssvcan_base);	ret=inb(ssvcan_base+1);	enable_irq(ssvcan_irq[0]);    }    else    {	disable_irq(ssvcan_irq[1]);	outb(address-ssvcan_base-0x100, ssvcan_base+0x02);	ret=inb(ssvcan_base+1+0x02);	enable_irq(ssvcan_irq[1]);    }    return ret;} /* !!! Don't change this function !!! */int ssv_register(struct hwspecops_t *hwspecops){    hwspecops->request_io = ssv_request_io;    hwspecops->release_io = ssv_release_io;    hwspecops->reset = ssv_reset;    hwspecops->init_hw_data = ssv_init_hw_data;    hwspecops->init_chip_data = ssv_init_chip_data;    hwspecops->init_obj_data = ssv_init_obj_data;    hwspecops->write_register = ssv_write_register;    hwspecops->read_register = ssv_read_register;    hwspecops->program_irq = ssv_program_irq;    return 0;}