Copyright (c) 2004 Rudolf Marek <r.marek@sh.cvut.cz>
+ Partly imported from i2c-vid.h of the lm_sensors project
+ Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
+ With assistance from Trent Piepho <xyzzy@speakeasy.org>
+
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
#include <linux/kernel.h>
#include <linux/hwmon-vid.h>
+/*
+ Common code for decoding VID pins.
+
+ References:
+
+ For VRM 8.4 to 9.1, "VRM x.y DC-DC Converter Design Guidelines",
+ available at http://developer.intel.com/.
+
+ For VRD 10.0 and up, "VRD x.y Design Guide",
+ available at http://developer.intel.com/.
+
+ AMD Opteron processors don't follow the Intel specifications.
+ I'm going to "make up" 2.4 as the spec number for the Opterons.
+ No good reason just a mnemonic for the 24x Opteron processor
+ series.
+
+ Opteron VID encoding is:
+ 00000 = 1.550 V
+ 00001 = 1.525 V
+ . . . .
+ 11110 = 0.800 V
+ 11111 = 0.000 V (off)
+*/
+
+/* vrm is the VRM/VRD document version multiplied by 10.
+ val is the 4-, 5- or 6-bit VID code.
+ Returned value is in mV to avoid floating point in the kernel. */
+int vid_from_reg(int val, int vrm)
+{
+ int vid;
+
+ switch(vrm) {
+
+ case 0:
+ return 0;
+
+ case 100: /* VRD 10.0 */
+ if((val & 0x1f) == 0x1f)
+ return 0;
+ if((val & 0x1f) <= 0x09 || val == 0x0a)
+ vid = 10875 - (val & 0x1f) * 250;
+ else
+ vid = 18625 - (val & 0x1f) * 250;
+ if(val & 0x20)
+ vid -= 125;
+ vid /= 10; /* only return 3 dec. places for now */
+ return vid;
+
+ case 24: /* Opteron processor */
+ return(val == 0x1f ? 0 : 1550 - val * 25);
+
+ case 91: /* VRM 9.1 */
+ case 90: /* VRM 9.0 */
+ return(val == 0x1f ? 0 :
+ 1850 - val * 25);
+
+ case 85: /* VRM 8.5 */
+ return((val & 0x10 ? 25 : 0) +
+ ((val & 0x0f) > 0x04 ? 2050 : 1250) -
+ ((val & 0x0f) * 50));
+
+ case 84: /* VRM 8.4 */
+ val &= 0x0f;
+ /* fall through */
+ default: /* VRM 8.2 */
+ return(val == 0x1f ? 0 :
+ val & 0x10 ? 5100 - (val) * 100 :
+ 2050 - (val) * 50);
+ }
+}
+
+
+/*
+ After this point is the code to automatically determine which
+ VRM/VRD specification should be used depending on the CPU.
+*/
+
struct vrm_model {
u8 vendor;
u8 eff_family;
{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}, /* 0xB Tualatin */
+ {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, 0x0, 90}, /* P4 */
+ {X86_VENDOR_INTEL, 0xF, 0x1, 90}, /* P4 Willamette */
+ {X86_VENDOR_INTEL, 0xF, 0x2, 90}, /* P4 Northwood */
{X86_VENDOR_INTEL, 0xF, 0x3, 100}, /* P4 Prescott */
- {X86_VENDOR_INTEL, 0xF, ANY, 90}, /* P4 before Prescott */
+ {X86_VENDOR_INTEL, 0xF, 0x4, 100}, /* P4 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)
{
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)))
+ 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++;
}
u8 eff_family, eff_model;
int vrm_ret;
- if (c->x86 < 6) return 0; /* any CPU with familly lower than 6
- dont have VID and/or CPUID */
+ 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);
}
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");
+ printk(KERN_INFO "hwmon-vid: Unknown VRM version of your "
+ "x86 CPU\n");
return vrm_ret;
}
-/* and now for something completely different for Non-x86 world*/
+/* and now something completely different for the non-x86 world */
#else
int vid_which_vrm(void)
{
}
#endif
+EXPORT_SYMBOL(vid_from_reg);
EXPORT_SYMBOL(vid_which_vrm);
MODULE_AUTHOR("Rudolf Marek <r.marek@sh.cvut.cz>");