/*
hwmon-vid.c - VID/VRM/VRD voltage conversions
Copyright (c) 2004 Rudolf Marek <r.marek@sh.cvut.cz>
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.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/hwmon-vid.h>
struct vrm_model {
u8 vendor;
u8 eff_family;
u8 eff_model;
int vrm_type;
};
#define ANY 0xFF
#ifdef CONFIG_X86
static struct vrm_model vrm_models[] = {
{X86_VENDOR_AMD, 0x6, ANY, 90}, /* Athlon Duron etc */
{X86_VENDOR_AMD, 0xF, ANY, 24}, /* Athlon 64, Opteron */
{X86_VENDOR_INTEL, 0x6, 0x9, 85}, /* 0.13um too */
{X86_VENDOR_INTEL, 0x6, 0xB, 85}, /* Tualatin */
{X86_VENDOR_INTEL, 0x6, ANY, 82}, /* any P6 */
{X86_VENDOR_INTEL, 0x7, ANY, 0}, /* Itanium */
{X86_VENDOR_INTEL, 0xF, 0x3, 100}, /* P4 Prescott */
{X86_VENDOR_INTEL, 0xF, ANY, 90}, /* P4 before Prescott */
{X86_VENDOR_INTEL, 0x10,ANY, 0}, /* Itanium 2 */
{X86_VENDOR_UNKNOWN, ANY, ANY, 0} /* stop here */
};
static int find_vrm(u8 eff_family, u8 eff_model, u8 vendor)
{
int i = 0;
while (vrm_models[i].vendor!=X86_VENDOR_UNKNOWN) {
if (vrm_models[i].vendor==vendor)
if ((vrm_models[i].eff_family==eff_family)
&& ((vrm_models[i].eff_model==eff_model) ||
(vrm_models[i].eff_model==ANY)))
return vrm_models[i].vrm_type;
i++;
}
return 0;
}
int vid_which_vrm(void)
{
struct cpuinfo_x86 *c = cpu_data;
u32 eax;
u8 eff_family, eff_model;
int vrm_ret;
if (c->x86 < 6) /* Any CPU with family lower than 6 */
return 0; /* doesn't have VID and/or CPUID */
eax = cpuid_eax(1);
eff_family = ((eax & 0x00000F00)>>8);
eff_model = ((eax & 0x000000F0)>>4);
if (eff_family == 0xF) { /* use extended model & family */
eff_family += ((eax & 0x00F00000)>>20);
eff_model += ((eax & 0x000F0000)>>16)<<4;
}
vrm_ret = find_vrm(eff_family,eff_model,c->x86_vendor);
if (vrm_ret == 0)
printk(KERN_INFO "hwmon-vid: Unknown VRM version of your "
"x86 CPU\n");
return vrm_ret;
}
/* and now something completely different for the non-x86 world */
#else
int vid_which_vrm(void)
{
printk(KERN_INFO "hwmon-vid: Unknown VRM version of your CPU\n");
return 0;
}
#endif
EXPORT_SYMBOL(vid_which_vrm);
MODULE_AUTHOR("Rudolf Marek <r.marek@sh.cvut.cz>");
MODULE_DESCRIPTION("hwmon-vid driver");
MODULE_LICENSE("GPL");
