/* nsi.c * Linux CAN-bus device driver. * Written by Arnaud Westenberg email:arnaud@wanadoo.nl * 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 <asm/irq.h>#include "../include/main.h"#include "../include/nsi.h"#include "../include/i82527.h"int nsican_irq=-1;unsigned long nsican_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 nsi_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 nsi_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 nsi_reset(int card){    int i;     DEBUGMSG("Resetting nsi hardware ...\n");    /* we don't use template_write_register because we don't use the two first       register of the card but the third in order to make a hard reset */    outb (1, nsican_base + candevices_p[card]->res_addr);    outb (0, nsican_base + candevices_p[card]->res_addr);    for (i = 1; i < 1000; i++)	udelay (1000);            /* Check hardware reset status */     i=0;    while ( (nsi_read_register(nsican_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");    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 1#define NR_SJA1000 0int nsi_init_hw_data(int card)      {	candevices_p[card]->res_addr=RESET_ADDR;	candevices_p[card]->nr_82527_chips=1;	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 nsi_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;	candevices_p[card]->chip[chipnr]->clock = 16000000;	nsican_irq=candevices_p[card]->chip[chipnr]->chip_irq;	        nsican_base=candevices_p[card]->chip[chipnr]->chip_base_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 nsi_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 nsi_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 nsi_write_register(unsigned char data, unsigned long address){    /* address is an absolute address */    /* the nsi 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 */    outw(address-nsican_base + (256 * data), nsican_base); }/* 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 nsi_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;        disable_irq(nsican_irq);     outb(address-nsican_base, nsican_base);    ret=inb(nsican_base+1);    enable_irq(nsican_irq);     return ret;} /* !!! Don't change this function !!! */int nsi_register(struct hwspecops_t *hwspecops){	hwspecops->request_io = nsi_request_io;	hwspecops->release_io = nsi_release_io;	hwspecops->reset = nsi_reset;	hwspecops->init_hw_data = nsi_init_hw_data;	hwspecops->init_chip_data = nsi_init_chip_data;	hwspecops->init_obj_data = nsi_init_obj_data;	hwspecops->write_register = nsi_write_register;	hwspecops->read_register = nsi_read_register;	hwspecops->program_irq = nsi_program_irq;	return 0;}