| /* |
| hwmon-vid.c - VID/VRM/VRD voltage conversions |
| |
| 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 |
| (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> |
| |
| /* |
| 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) |
| |
| The 17 specification is in fact Intel Mobile Voltage Positioning - |
| (IMVP-II). You can find more information in the datasheet of Max1718 |
| http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2452 |
| |
| The 13 specification corresponds to the Intel Pentium M series. There |
| doesn't seem to be any named specification for these. The conversion |
| tables are detailed directly in the various Pentium M datasheets: |
| http://www.intel.com/design/intarch/pentiumm/docs_pentiumm.htm |
| */ |
| |
| /* 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, u8 vrm) |
| { |
| int vid; |
| |
| switch(vrm) { |
| |
| case 100: /* VRD 10.0 */ |
| val &= 0x3f; |
| 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 */ |
| val &= 0x1f; |
| return(val == 0x1f ? 0 : 1550 - val * 25); |
| |
| case 91: /* VRM 9.1 */ |
| case 90: /* VRM 9.0 */ |
| val &= 0x1f; |
| return(val == 0x1f ? 0 : |
| 1850 - val * 25); |
| |
| case 85: /* VRM 8.5 */ |
| val &= 0x1f; |
| return((val & 0x10 ? 25 : 0) + |
| ((val & 0x0f) > 0x04 ? 2050 : 1250) - |
| ((val & 0x0f) * 50)); |
| |
| case 84: /* VRM 8.4 */ |
| val &= 0x0f; |
| /* fall through */ |
| case 82: /* VRM 8.2 */ |
| val &= 0x1f; |
| return(val == 0x1f ? 0 : |
| val & 0x10 ? 5100 - (val) * 100 : |
| 2050 - (val) * 50); |
| case 17: /* Intel IMVP-II */ |
| val &= 0x1f; |
| return(val & 0x10 ? 975 - (val & 0xF) * 25 : |
| 1750 - val * 50); |
| case 13: |
| val &= 0x3f; |
| return(1708 - val * 16); |
| default: /* report 0 for unknown */ |
| printk(KERN_INFO "hwmon-vid: requested unknown VRM version\n"); |
| return 0; |
| } |
| } |
| |
| |
| /* |
| 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; |
| u8 eff_model; |
| u8 eff_stepping; |
| u8 vrm_type; |
| }; |
| |
| #define ANY 0xFF |
| |
| #ifdef CONFIG_X86 |
| |
| /* the stepping parameter is highest acceptable stepping for current line */ |
| |
| static struct vrm_model vrm_models[] = { |
| {X86_VENDOR_AMD, 0x6, ANY, ANY, 90}, /* Athlon Duron etc */ |
| {X86_VENDOR_AMD, 0xF, ANY, ANY, 24}, /* Athlon 64, Opteron and above VRM 24 */ |
| {X86_VENDOR_INTEL, 0x6, 0x9, ANY, 13}, /* Pentium M (130 nm) */ |
| {X86_VENDOR_INTEL, 0x6, 0xB, ANY, 85}, /* Tualatin */ |
| {X86_VENDOR_INTEL, 0x6, 0xD, ANY, 13}, /* Pentium M (90 nm) */ |
| {X86_VENDOR_INTEL, 0x6, ANY, ANY, 82}, /* any P6 */ |
| {X86_VENDOR_INTEL, 0x7, ANY, ANY, 0}, /* Itanium */ |
| {X86_VENDOR_INTEL, 0xF, 0x0, ANY, 90}, /* P4 */ |
| {X86_VENDOR_INTEL, 0xF, 0x1, ANY, 90}, /* P4 Willamette */ |
| {X86_VENDOR_INTEL, 0xF, 0x2, ANY, 90}, /* P4 Northwood */ |
| {X86_VENDOR_INTEL, 0xF, ANY, ANY, 100}, /* Prescott and above assume VRD 10 */ |
| {X86_VENDOR_INTEL, 0x10, ANY, ANY, 0}, /* Itanium 2 */ |
| {X86_VENDOR_CENTAUR, 0x6, 0x7, ANY, 85}, /* Eden ESP/Ezra */ |
| {X86_VENDOR_CENTAUR, 0x6, 0x8, 0x7, 85}, /* Ezra T */ |
| {X86_VENDOR_CENTAUR, 0x6, 0x9, 0x7, 85}, /* Nemiah */ |
| {X86_VENDOR_CENTAUR, 0x6, 0x9, ANY, 17}, /* C3-M */ |
| {X86_VENDOR_UNKNOWN, ANY, ANY, ANY, 0} /* stop here */ |
| }; |
| |
| static u8 find_vrm(u8 eff_family, u8 eff_model, u8 eff_stepping, 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)) && |
| (eff_stepping <= vrm_models[i].eff_stepping)) |
| return vrm_models[i].vrm_type; |
| i++; |
| } |
| |
| return 0; |
| } |
| |
| u8 vid_which_vrm(void) |
| { |
| struct cpuinfo_x86 *c = cpu_data; |
| u32 eax; |
| u8 eff_family, eff_model, eff_stepping, 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); |
| eff_stepping = eax & 0xF; |
| 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, eff_stepping, 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 for something completely different for the non-x86 world */ |
| #else |
| u8 vid_which_vrm(void) |
| { |
| printk(KERN_INFO "hwmon-vid: Unknown VRM version of your CPU\n"); |
| return 0; |
| } |
| #endif |
| |
| EXPORT_SYMBOL(vid_from_reg); |
| EXPORT_SYMBOL(vid_which_vrm); |
| |
| MODULE_AUTHOR("Rudolf Marek <r.marek@sh.cvut.cz>"); |
| |
| MODULE_DESCRIPTION("hwmon-vid driver"); |
| MODULE_LICENSE("GPL"); |