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/*
isaset.c - isaset, a user-space program to write ISA registers
Copyright (C) 2000 Frodo Looijaard <frodol@dds.nl>, and
Mark D. Studebaker <mdsxyz123@yahoo.com>
Copyright (C) 2004-2011 Jean Delvare <jdelvare@suse.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301 USA.
*/
/*
Typical usage:
isaset 0x295 0x296 0x10 0x12 Write 0x12 to address 0x10 using address/data registers
isaset -f 0x5010 0x12 Write 0x12 to location 0x5010
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "util.h"
/* To keep glibc2 happy */
#if defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ >= 0
#include <sys/io.h>
#else
#include <asm/io.h>
#endif
#ifdef __powerpc__
unsigned long isa_io_base = 0; /* XXX for now */
#endif /* __powerpc__ */
static void help(void)
{
fprintf(stderr,
"Syntax for I2C-like access:\n"
" isaset [OPTIONS] ADDRREG DATAREG ADDRESS VALUE [MASK]\n"
"Syntax for flat address space:\n"
" isaset -f [OPTIONS] ADDRESS VALUE [MASK]\n"
"Options:\n"
" -f Enable flat address space mode\n"
" -y Assume affirmative answer to all questions\n"
" -W Write a word (16-bit) value\n"
" -L Write a long (32-bit) value\n");
}
int main(int argc, char *argv[])
{
int addrreg, datareg = 0, addr = 0;
unsigned long value, vmask = 0, maxval = 0xff, res;
int flags = 0;
int flat = 0, yes = 0, width = 1;
char *end;
/* handle (optional) flags first */
while (1+flags < argc && argv[1+flags][0] == '-') {
switch (argv[1+flags][1]) {
case 'f': flat = 1; break;
case 'y': yes = 1; break;
case 'W': width = 2; maxval = 0xffff; break;
case 'L': width = 4; maxval = 0xffffffff; break;
default:
fprintf(stderr, "Warning: Unsupported flag "
"\"-%c\"!\n", argv[1+flags][1]);
help();
exit(1);
}
flags++;
}
/* verify that the argument count is correct */
if ((!flat && (argc < 1+flags+4 || argc > 1+flags+5))
|| (flat && (argc < 1+flags+2 || argc > 1+flags+3))) {
help();
exit(1);
}
addrreg = strtol(argv[1+flags], &end, 0);
if (*end) {
fprintf(stderr, "Error: Invalid address!\n");
help();
exit(1);
}
if (addrreg < 0 || addrreg > (flat?0xffff:0x3fff)) {
fprintf(stderr,
"Error: Address out of range (0x0000-0x%04x)!\n",
flat?0xffff:0x3fff);
help();
exit(1);
}
if (!flat) {
datareg = strtol(argv[1+flags+1], &end, 0);
if (*end) {
fprintf(stderr, "Error: Invalid data register!\n");
help();
exit(1);
}
if (datareg < 0 || datareg > 0x3fff) {
fprintf(stderr, "Error: Data register out of range "
"(0x0000-0x3fff)!\n");
help();
exit(1);
}
addr = strtol(argv[1+flags+2], &end, 0);
if (*end) {
fprintf(stderr, "Error: Invalid address!\n");
help();
exit(1);
}
if (addr < 0 || addr > 0xff) {
fprintf(stderr, "Error: Address out of range "
"(0x00-0xff)!\n");
help();
exit(1);
}
}
/* rest is the same for both modes so we cheat on flags */
if (!flat)
flags += 2;
value = strtoul(argv[flags+2], &end, 0);
if (*end) {
fprintf(stderr, "Error: Invalid value!\n");
help();
exit(1);
}
if (value > maxval) {
fprintf(stderr, "Error: Value out of range "
"(0x%0*u-%0*lu)!\n", width * 2, 0, width * 2, maxval);
help();
exit(1);
}
if (flags+3 < argc) {
vmask = strtoul(argv[flags+3], &end, 0);
if (*end) {
fprintf(stderr, "Error: Invalid mask!\n");
help();
exit(1);
}
if (vmask > maxval) {
fprintf(stderr, "Error: Mask out of range "
"(0x%0*u-%0*lu)!\n", width * 2, 0,
width * 2, maxval);
help();
exit(1);
}
}
if (geteuid()) {
fprintf(stderr, "Error: Can only be run as root "
"(or make it suid root)\n");
exit(1);
}
if (!yes) {
fprintf(stderr, "WARNING! Running this program can cause "
"system crashes, data loss and worse!\n");
if (flat)
fprintf(stderr,
"I will write value 0x%0*lx%s to address "
"0x%x.\n", width * 2, value,
vmask ? " (masked)" : "", addrreg);
else
fprintf(stderr,
"I will write value 0x%0*lx%s to address "
"0x%02x of chip with address register 0x%x\n"
"and data register 0x%x.\n", width * 2,
value, vmask ? " (masked)" : "", addr,
addrreg, datareg);
fprintf(stderr, "Continue? [Y/n] ");
fflush(stderr);
if (!user_ack(1)) {
fprintf(stderr, "Aborting on user request.\n");
exit(0);
}
}
#ifndef __powerpc__
if (!flat && datareg < 0x400 && addrreg < 0x400) {
if (ioperm(datareg, 1, 1)) {
fprintf(stderr, "Error: Could not ioperm() data "
"register!\n");
exit(1);
}
if (ioperm(addrreg, 1, 1)) {
fprintf(stderr, "Error: Could not ioperm() address "
"register!\n");
exit(1);
}
} else {
if (iopl(3)) {
fprintf(stderr, "Error: Could not do iopl(3)!\n");
exit(1);
}
}
#endif
if (vmask) {
unsigned long oldvalue;
if (flat) {
oldvalue = inx(addrreg, width);
} else {
outb(addr, addrreg);
oldvalue = inx(datareg, width);
}
value = (value & vmask) | (oldvalue & ~vmask);
if (!yes) {
fprintf(stderr, "Old value 0x%0*lx, write mask "
"0x%0*lx: Will write 0x%0*lx to %s "
"0x%02x\n", width * 2, oldvalue,
width * 2, vmask, width * 2, value,
flat ? "address" : "register",
flat ? addrreg : addr);
fprintf(stderr, "Continue? [Y/n] ");
fflush(stderr);
if (!user_ack(1)) {
fprintf(stderr, "Aborting on user request.\n");
exit(0);
}
}
}
/* do the real thing */
if (flat) {
/* write */
outx(value, addrreg, width);
/* readback */
res = inx(addrreg, width);
} else {
/* write */
outb(addr, addrreg);
outx(value, datareg, width);
/* readback */
res = inx(datareg, width);
}
if (res != value) {
fprintf(stderr, "Data mismatch, wrote 0x%0*lx, "
"read 0x%0*lx back.\n", width * 2, value,
width * 2, res);
}
exit(0);
}
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