On 1/19/10, Jeff Epler <[email protected]> wrote:
> What does linux parport_pc say about ports?
>
> Presumably the "base" and "base_hi" ports all have to be from the set of
> I/O ports named in lspci, so the "base_hi" ports must be the 1000 and
> 1010 addresses if the xxx8 addresses are the "base"s.
# insmod /lib/modules/2.6.30.5-rtai/kernel/drivers/parport/parport_pc.ko
# cat /proc/sys/dev/parport/parport1/base-addr
4120 4112
(these are 0x1018 and 0x1010)
# cat /proc/sys/dev/parport/parport2/base-addr
4104 4096
(these are 0x1008 and 0x1000)
I tried to write 0x80 to 0x1010 and 0x1000 but nothing changed.
I used the attached code to write. The program output:
# ./epp 0x1010
00
write 80
00
# ./epp 0x1000
00
write 80
00
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/io.h>
#define ECR_OFFSET 0x400
#define SPP_MODE 0x00
#define ECP_MODE 0x60
#define EPP_MODE 0x80
int main(int argc, char *argv[]) {
unsigned int base;
unsigned int ecr;
unsigned char reg;
if (argc != 2) {
printf("No base address\n");
exit(1);
}
// get the base address from the commandline
base = strtol(argv[1], NULL, 16);
// Extended Control Register address
//ecr = base + ECR_OFFSET;
ecr = base;
// request to access to the address space
if (iopl(3)) {
perror("iopl");
exit(2);
}
// request to write access to ECR
if (ioperm(ecr, 1, 1)) {
perror("ioperm");
exit(3);
}
// read from ECR
reg = inb_p(ecr);
printf("%02x\n", reg);
// change mode
reg = reg & 0x1F;
reg = reg | EPP_MODE;
printf("write %02x\n", reg);
// write to ECR
outb(reg, ecr);
usleep(100000);
// read from ECR
reg = inb_p(ecr);
printf("%02x\n", reg);
// release to write privilege
if (ioperm(ecr, 1, 0)) {
perror("ioperm1");
exit(4);
}
exit(0);
}
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