-/* pc-i03.c
- * Linux CAN-bus device driver.
- * Written by Arnaud Westenberg email:arnaud@wnadoo.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 "../include/main.h"
-#include "../include/pc-i03.h"
-#include "../include/sja1000.h"
-
-/* Basic hardware io address. This is also stored in the hardware structure but
- * we need it global, else we have to change many internal functions.
- * pc-i03_base_addr is initialized in pc-i03_init_chip_data().
- */
-unsigned int pci03_base_addr;
-
-/*
- * 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 0x200 // The pc-i03 uses an additional 0x100 bytes reset space
-
-/**
- * pci03_request_io: - reserve io memory
- * @io_addr: The reserved memory starts at @io_addr, wich is the module
- * parameter @io.
- *
- * The function pci03_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/pc-i03.c
- */
-int pci03_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;
-}
-
-/**
- * pci03_release_io - free reserved io-memory
- * @io_addr: Start of the memory range to be released.
- *
- * The function pci03_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/pc-i03.c
- */
-int pci03_release_io(unsigned long io_addr)
-{
- release_region(io_addr,IO_RANGE);
-
- return 0;
-}
-
-/**
- * pci03_reset - hardware reset routine
- * @card: Number of the hardware card.
- *
- * The function pci03_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/pc-i03.c
- */
-int pci03_reset(int card)
-{
- int i=0;
-
- DEBUGMSG("Resetting pc-i03 hardware ...\n");
- pci03_write_register(0x01,pci03_base_addr +
- 0x100); // Write arbitrary data to reset mem
- udelay(20000);
-
- pci03_write_register(0x00, pci03_base_addr + SJACR);
-
- /* Check hardware reset status */
- i=0;
- while ( (pci03_read_register(pci03_base_addr + SJACR) & CR_RR)
- && (i<=15) ) {
- udelay(20000);
- i++;
- }
- if (i>=15) {
- CANMSG("Reset status timeout!\n");
- CANMSG("Please check your hardware.\n");
- return -ENODEV;
- }
- else
- DEBUGMSG("Chip[0] reset status ok.\n");
-
- return 0;
-}
-
-#define RESET_ADDR 0x100
-#define NR_82527 0
-#define NR_SJA1000 1
-
-/**
- * pci03_init_hw_data - Initialze hardware cards
- * @card: Number of the hardware card.
- *
- * The function pci03_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/pc-i03.c
- */
-int pci03_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=NR_SJA1000;
- candevices_p[card]->flags |= ~PROGRAMMABLE_IRQ;
-
- return 0;
-}
-
-#define CHIP_TYPE "sja1000"
-/**
- * pci03_init_chip_data - Initialize chips
- * @card: Number of the hardware card
- * @chipnr: Number of the CAN chip on the hardware card
- *
- * The function pci03_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.
- * Return Value: The function always returns zero
- * File: src/pc-i03.c
- */
-int pci03_init_chip_data(int card, int chipnr)
-{
- pci03_base_addr = candevices_p[card]->io_addr;
- 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]->sja_cdr_reg = CDR_CBP | CDR_CLK_OFF;
- candevices_p[card]->chip[chipnr]->sja_ocr_reg = OCR_MODE_NORMAL |
- OCR_TX0_HL | OCR_TX1_LZ;
-
- return 0;
-}
-
-/**
- * pci03_init_obj_data - Initialize message buffers
- * @chipnr: Number of the CAN chip
- * @objnr: Number of the message buffer
- *
- * The function pci03_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/pc-i03.c
- */
-int pci03_init_obj_data(int chipnr, int objnr)
-{
- chips_p[chipnr]->msgobj[objnr]->obj_base_addr=chips_p[chipnr]->chip_base_addr;
- chips_p[chipnr]->msgobj[objnr]->flags=0;
-
- return 0;
-}
-
-/**
- * pci03_program_irq - program interrupts
- * @card: Number of the hardware card.
- *
- * The function pci03_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/pc-i03.c
- */
-int pci03_program_irq(int card)
-{
- return 0;
-}
-
-/**
- * pci03_write_register - Low level write register routine
- * @data: data to be written
- * @address: memory address to write to
- *
- * The function pci03_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/pc-i03.c
- */
-void pci03_write_register(unsigned char data, unsigned long address)
-{
- unsigned int *pci03_base_ptr;
- unsigned short address_to_write;
-
- /* The read/write functions are called by an extra abstract function.
- * This extra function adds the basic io address of the card to the
- * memory address we want to write to, so we substract the basic io
- * address again to obtain the offset into the hardware's memory map.
- */
- address_to_write = address - pci03_base_addr; // Offset
- pci03_base_ptr = (unsigned int *)(pci03_base_addr * 0x100001);
- (*(pci03_base_ptr+address_to_write)) = data;
-}
-
-/**
- * pci03_read_register - Low level read register routine
- * @address: memory address to read from
- *
- * The function pci03_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/pc-i03.c
- */
-unsigned pci03_read_register(unsigned long address)
-{
- unsigned int *pci03_base_ptr;
- unsigned short address_to_read;
-
- /* The read/write functions are called by an extra abstract function.
- * This extra function adds the basic io address of the card to the
- * memory address we want to write to, so we substract the basic io
- * address again to obtain the offset into the hardware's memory map.
- */
- address_to_read = address - pci03_base_addr;
- pci03_base_ptr = (unsigned int *)(pci03_base_addr * 0x100001);
- return (*(pci03_base_ptr+address_to_read));
-}
-
-int pci03_register(struct hwspecops_t *hwspecops)
-{
- hwspecops->request_io = pci03_request_io;
- hwspecops->release_io = pci03_release_io;
- hwspecops->reset = pci03_reset;
- hwspecops->init_hw_data = pci03_init_hw_data;
- hwspecops->init_chip_data = pci03_init_chip_data;
- hwspecops->init_obj_data = pci03_init_obj_data;
- hwspecops->write_register = pci03_write_register;
- hwspecops->read_register = pci03_read_register;
- hwspecops->program_irq = pci03_program_irq;
- return 0;
-}
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