/* m437.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 */ /*  * Support for the SECO M437  *  * SECO M437 is a pc104 format, i82527 controller based card * produced by SECO http://www.seco.it  * This driver uses the Memory Mapped I/O mode, and should be * working with all cards supporting this mode. * * Written by Fabio Parodi  (fabio.parodi@iname.com) * Additional changes by Giampiero Giancipoli (gianci@freemail.it) * * Version 0.1  08 Jun 2001 * */#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 "../include/main.h"#include "../include/m437.h"#include "../include/i82527.h"/* * 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 in basic CAN mode. */#define IO_RANGE 0x100static long base = 0L; /** * m437_request_io: - reserve io memory * @io_addr: The reserved memory starts at @io_addr, wich is the module  * parameter @io. * * The function m437_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.  * %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 in basic CAN mode. * Return Value: The function returns zero on success or %-ENODEV on failure * File: src/m437.c */int m437_request_io(unsigned long io_addr){	if ( !( base = (long) ioremap( io_addr, IO_RANGE ) ) ) {		CANMSG("Unable to access I/O memory at: 0x%lx\n", io_addr);		return -ENODEV;		}	DEBUGMSG("Registered IO-memory: 0x%lx - 0x%lx\n", io_addr, io_addr + IO_RANGE - 1);	return 0;}/** * m437_release_io - free reserved io-memory * @io_addr: Start of the memory range to be released. * * The function m437_release_io() is used to free reserved io-memory. * In case you have reserved more io memory, don't forget to free it here. * IO_RANGE is the io-memory range that gets released, please adjust according * your hardware. Example: #define IO_RANGE 0x100 for i82527 chips or * #define IO_RANGE 0x20 for sja1000 chips in basic CAN mode. * Return Value: The function always returns zero * File: src/m437.c */int m437_release_io(unsigned long io_addr){	unsigned i;	        /* disable IRQ generation */        m437_write_register(iCTL_CCE, iCTL);	/* clear all message objects */	for (i=1; i<=15; i++) {		m437_write_register(				INTPD_RES | 				RXIE_RES | 				TXIE_RES | 				MVAL_RES, 				i*0x10+iMSGCTL0);		m437_write_register(				NEWD_RES | 				MLST_RES | 				CPUU_RES | 				TXRQ_RES | 				RMPD_RES, 				i*0x10+iMSGCTL1);	}		/* power down i82527 */	m437_write_register(iCPU_PWD, iCPU);		/* release I/O memory mapping */	iounmap((void*)base);	return 0;}/** * m437_reset - hardware reset routine * @card: Number of the hardware card. * * The function m437_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. * Return Value: The function returns zero on success or %-ENODEV on failure * File: src/m437.c */int m437_reset(int card){	return 0;}#define RESET_ADDR 0x0#define NR_82527 1#define NR_SJA1000 0/** * m437_init_hw_data - Initialze hardware cards * @card: Number of the hardware card. * * The function m437_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. * Return Value: The function always returns zero * File: src/m437.c */int m437_init_hw_data(int card) {	DEBUGMSG("m437_init_hw_data()\n");	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;	/* The M437 has no programmable IRQ */	return 0;}#define CHIP_TYPE "i82527"/** * m437_init_chip_data - Initialize chips * @card: Number of the hardware card * @chipnr: Number of the CAN chip on the hardware card * * The function m437_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 entry holds the chip clock value in Hz. * The entry @sja_cdr_reg holds hardware specific options for the Clock Divider * register. Options defined in the %sja1000.h file: * %CDR_CLKOUT_MASK, %CDR_CLK_OFF, %CDR_RXINPEN, %CDR_CBP, %CDR_PELICAN * The entry @sja_ocr_reg holds hardware specific options for the Output Control * register. Options defined in the %sja1000.h file: * %OCR_MODE_BIPHASE, %OCR_MODE_TEST, %OCR_MODE_NORMAL, %OCR_MODE_CLOCK, * %OCR_TX0_LH, %OCR_TX1_ZZ. * The entry @int_clk_reg holds hardware specific options for the Clock Out * register. Options defined in the %i82527.h file: * %iCLK_CD0, %iCLK_CD1, %iCLK_CD2, %iCLK_CD3, %iCLK_SL0, %iCLK_SL1. * The entry @int_bus_reg holds hardware specific options for the Bus  * Configuration register. Options defined in the %i82527.h file: * %iBUS_DR0, %iBUS_DR1, %iBUS_DT1, %iBUS_POL, %iBUS_CBY. * The entry @int_cpu_reg holds hardware specific options for the cpu interface * register. Options defined in the %i82527.h file: * %iCPU_CEN, %iCPU_MUX, %iCPU_SLP, %iCPU_PWD, %iCPU_DMC, %iCPU_DSC, %iCPU_RST. * Return Value: The function always returns zero * File: src/m437.c */int m437_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;	candevices_p[card]->chip[chipnr]->int_cpu_reg = iCPU_DSC | iCPU_CEN;	candevices_p[card]->chip[chipnr]->int_clk_reg = 		iCLK_CD0 | iCLK_CD1 | iCLK_CD2 | iCLK_SL0 | iCLK_SL1;	candevices_p[card]->chip[chipnr]->int_bus_reg = iBUS_CBY;	return 0;}/** * m437_init_obj_data - Initialize message buffers * @chipnr: Number of the CAN chip * @objnr: Number of the message buffer * * The function m437_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. * Return Value: The function always returns zero * File: src/m437.c */int m437_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;}/** * m437_program_irq - program interrupts * @card: Number of the hardware card. * * The function m437_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. * Return value: The function returns zero on success or %-ENODEV on failure * File: src/m437.c */int m437_program_irq(int card){	return 0;}/** * m437_write_register - Low level write register routine * @data: data to be written * @address: memory address to write to * * The function m437_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. * Return Value: The function does not return a value * File: src/m437.c */void m437_write_register(unsigned char data, unsigned long address){	writeb(data,base+address);}/** * m437_read_register - Low level read register routine * @address: memory address to read from * * The function m437_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. * Return Value: The function returns the value stored in @address * File: src/m437.c */unsigned m437_read_register(unsigned long address){	return readb(base+address);}/* !!! Don't change this function !!! */int m437_register(struct hwspecops_t *hwspecops){	DEBUGMSG("m437_register()\n");	hwspecops->request_io = m437_request_io;	hwspecops->release_io = m437_release_io;	hwspecops->reset = m437_reset;	hwspecops->init_hw_data = m437_init_hw_data;	hwspecops->init_chip_data = m437_init_chip_data;	hwspecops->init_obj_data = m437_init_obj_data;	hwspecops->write_register = m437_write_register;	hwspecops->read_register = m437_read_register;	hwspecops->program_irq = m437_program_irq;	return 0;}