Hi!
Even though my problem isn't concerning realtime yet, i hope that you will be able to
help out.
I have that some of you have maked some programs accessing IO, and thats where my
problem is right now.
I am trying to make a realtime device driver ARCNET. The project is in its early
stages and i just start out with trying to make a device driver then later on, make it
realtime.
But it is givin me some problems when i try to write/read to the ISA-netcard.
The ISA-card is at adress 0x300 (the card is I/O mapped).
The ISA-card have some internal RAM.
My problem is like this : i write something to the internal RAM via a data-register,
then i write "something" else to the data-register, the i read from the internal RAM
(same adress as i wrote to earlier) (this read should put data into the
data-register), but i only read the "something" that i temporary wrote to the
data-register before.
I can easily register my ISA-card to port 0x300.
I have put the source code at the buttom of this email.
Does somebody have any idea to help me out ?
Thanks in advance
Michael
//source-code starts here
#ifndef __KERNEL__
# define __KERNEL__
#endif
#ifndef MODULE
# define MODULE
#endif
#include <linux/module.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/errno.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <asm/io.h>
#define ADRESS 0x300
/* Define adress for most used regsters*/
#define STATUS 0
#define INTMASK 0
#define COMMAND 1
#define DIAG 1
#define ADR_PTR_H 2
#define ADR_PTR_L 3
#define DATA 4
#define SUBADR 5
#define CONFIG 6
#define REG7 7
#define READ 0x80 //NO DMA
#define WRITE 0x0 //NO DMA
/*funktion til at initialisere isa-kortet*/
void init_card(void){
int value;
void *io_base;
io_base = ioremap(ADRESS,8);
writeb(1,io_base+SUBADR); //prepare to write NODEID
writeb(241,io_base+REG7); //NODEID=241
writeb(0x7,io_base+DATA); //put 0x7 into data-register
writeb(WRITE,io_base+ADR_PTR_H); //prepare to write
writeb(0x11,io_base+ADR_PTR_L); //write to odd adr
writeb(0xff,io_base+DATA); // put something else into data-register than
what was written
writeb(READ,io_base+ADR_PTR_H); //prepare to read
writeb(0x11,io_base+ADR_PTR_L); //read at adr=0x11
value=readb(io_base+DATA);
printk("First READ gives : %X \n",value);
iounmap(io_base);
}
int init_module(void){
int errno;
char *nam="test driver";
request_region(ADRESS,8,nam);
init_card();
return 0;
}
void cleanup_module(void){
release_region(ADRESS,8);
}
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