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/*
* acpi_reset.c: Reboot your LinuxBIOS system with ACPI software watchdo
*
*
* Copyright 2000 Silicon Integrated System Corporation
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
* Reference:
* 1. SiS 630 Specification
*
* $Id$
*/
#include <errno.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/io.h>
#include <unistd.h>
#include <stdio.h>
unsigned short acpi_base;
void
waitsmbus()
{
unsigned short port = acpi_base;
unsigned char val;
//printf("waitsmb ..\n");
for (val = inb(port); (val & 8) == 0; val = inb(port))
;
//printf("past first test\n");
}
void
setsmbus(unsigned char index, unsigned char value)
{
unsigned short port = acpi_base + index;
//printf("setsmbus: index 0x%02x, value 0x%02x\n",
// index, value);
outb(value, port);
}
unsigned char
getsmbus(unsigned char index)
{
unsigned short port = acpi_base + index;
unsigned char value;
value = inb(port);
//printf("getsmbus: index 0x%02x, value 0x%02x\n",
// index, value);
return value;
}
unsigned char
read_spd(unsigned char slot, unsigned char index)
{
unsigned char value;
setsmbus(0x03, 0x20);
setsmbus(0x04, 0xA1 + (slot << 1));
setsmbus(0x05, index);
setsmbus(0x03, 0x12);
waitsmbus();
value = getsmbus(0x08);
setsmbus(0x00, 0xFF);
return value;
}
main()
{
unsigned char b;
unsigned short w;
/* get io privilege access PCI configuration space */
if (iopl(3) != 0) {
perror("Can not set io priviliage");
exit(1);
}
/* Enable ACPI by set B7 on Reg 0x40, LPC */
outl(0x80000840, 0x0cf8);
b = inb(0x0cfc) | 0x80;
outb(b, 0xcfc);
/* get the ACPI base address for register 0x74,0x75 of LPC */
outl(0x80000874, 0x0cf8);
w = inw(0x0cfc);
acpi_base = w + 0x80;
printf("Number of bytes used by module manufacturer 0x%02x\n",
read_spd(0x00, 0x00));
printf("Memory Type 0x%02x\n",
read_spd(0x00, 0x02));
printf("Number of Row Address bits 0x%02x\n",
read_spd(0x00, 0x03));
printf("Number of Column Address bits 0x%02x\n",
read_spd(0x00, 0x04));
printf("Number of Sides 0x%02x\n",
read_spd(0x00, 0x05));
printf("Number of Banks 0x%02x\n",
read_spd(0x00, 0x11));
}
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