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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Frank Myhr15872212008-08-06 22:41:06 +02002 * hwmon-vid.c - VID/VRM/VRD voltage conversions
3 *
4 * Copyright (c) 2004 Rudolf Marek <r.marek@assembler.cz>
5 *
6 * Partly imported from i2c-vid.h of the lm_sensors project
7 * Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
8 * With assistance from Trent Piepho <xyzzy@speakeasy.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/module.h>
26#include <linux/kernel.h>
Jean Delvare303760b2005-07-31 21:52:01 +020027#include <linux/hwmon-vid.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Jean Delvared0f28272005-08-01 22:50:08 +020029/*
Frank Myhr15872212008-08-06 22:41:06 +020030 * Common code for decoding VID pins.
31 *
32 * References:
33 *
34 * For VRM 8.4 to 9.1, "VRM x.y DC-DC Converter Design Guidelines",
35 * available at http://developer.intel.com/.
36 *
37 * For VRD 10.0 and up, "VRD x.y Design Guide",
38 * available at http://developer.intel.com/.
39 *
Jean Delvarecebd7702008-08-15 10:58:05 +020040 * AMD Athlon 64 and AMD Opteron Processors, AMD Publication 26094,
41 * http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/26094.PDF
42 * Table 74. VID Code Voltages
43 * This corresponds to an arbitrary VRM code of 24 in the functions below.
44 * These CPU models (K8 revision <= E) have 5 VID pins. See also:
45 * Revision Guide for AMD Athlon 64 and AMD Opteron Processors, AMD Publication 25759,
46 * http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/25759.pdf
47 *
48 * AMD NPT Family 0Fh Processors, AMD Publication 32559,
Frank Myhr116d0482008-08-06 22:41:06 +020049 * http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/32559.pdf
50 * Table 71. VID Code Voltages
Jean Delvarecebd7702008-08-15 10:58:05 +020051 * This corresponds to an arbitrary VRM code of 25 in the functions below.
52 * These CPU models (K8 revision >= F) have 6 VID pins. See also:
53 * Revision Guide for AMD NPT Family 0Fh Processors, AMD Publication 33610,
54 * http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/33610.pdf
Frank Myhr15872212008-08-06 22:41:06 +020055 *
Frank Myhr15872212008-08-06 22:41:06 +020056 * The 17 specification is in fact Intel Mobile Voltage Positioning -
57 * (IMVP-II). You can find more information in the datasheet of Max1718
58 * http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2452
59 *
60 * The 13 specification corresponds to the Intel Pentium M series. There
61 * doesn't seem to be any named specification for these. The conversion
62 * tables are detailed directly in the various Pentium M datasheets:
63 * http://www.intel.com/design/intarch/pentiumm/docs_pentiumm.htm
64 *
65 * The 14 specification corresponds to Intel Core series. There
66 * doesn't seem to be any named specification for these. The conversion
67 * tables are detailed directly in the various Pentium Core datasheets:
68 * http://www.intel.com/design/mobile/datashts/309221.htm
69 *
70 * The 110 (VRM 11) specification corresponds to Intel Conroe based series.
71 * http://www.intel.com/design/processor/applnots/313214.htm
72 */
Jean Delvared0f28272005-08-01 22:50:08 +020073
Frank Myhr15872212008-08-06 22:41:06 +020074/*
75 * vrm is the VRM/VRD document version multiplied by 10.
76 * val is the 4-bit or more VID code.
77 * Returned value is in mV to avoid floating point in the kernel.
78 * Some VID have some bits in uV scale, this is rounded to mV.
79 */
Rudolf Marek734a12a2005-12-18 16:36:52 +010080int vid_from_reg(int val, u8 vrm)
Jean Delvared0f28272005-08-01 22:50:08 +020081{
82 int vid;
83
84 switch(vrm) {
85
Jean Delvared0f28272005-08-01 22:50:08 +020086 case 100: /* VRD 10.0 */
Rudolf Marek6af586d2006-06-12 22:00:53 +020087 /* compute in uV, round to mV */
Rudolf Marek177d1652006-04-25 14:24:46 +020088 val &= 0x3f;
Jean Delvared0f28272005-08-01 22:50:08 +020089 if((val & 0x1f) == 0x1f)
90 return 0;
91 if((val & 0x1f) <= 0x09 || val == 0x0a)
Rudolf Marek6af586d2006-06-12 22:00:53 +020092 vid = 1087500 - (val & 0x1f) * 25000;
Jean Delvared0f28272005-08-01 22:50:08 +020093 else
Rudolf Marek6af586d2006-06-12 22:00:53 +020094 vid = 1862500 - (val & 0x1f) * 25000;
Jean Delvared0f28272005-08-01 22:50:08 +020095 if(val & 0x20)
Rudolf Marek6af586d2006-06-12 22:00:53 +020096 vid -= 12500;
97 return((vid + 500) / 1000);
Jean Delvared0f28272005-08-01 22:50:08 +020098
Rudolf Marek6af586d2006-06-12 22:00:53 +020099 case 110: /* Intel Conroe */
100 /* compute in uV, round to mV */
101 val &= 0xff;
Jean Delvare9fab2d82007-01-18 22:14:23 +0100102 if (val < 0x02 || val > 0xb2)
Rudolf Marek6af586d2006-06-12 22:00:53 +0200103 return 0;
104 return((1600000 - (val - 2) * 6250 + 500) / 1000);
Frank Myhr116d0482008-08-06 22:41:06 +0200105
Jean Delvarecebd7702008-08-15 10:58:05 +0200106 case 24: /* Athlon64 & Opteron */
107 val &= 0x1f;
108 if (val == 0x1f)
109 return 0;
110 /* fall through */
111 case 25: /* AMD NPT 0Fh */
Frank Myhr116d0482008-08-06 22:41:06 +0200112 val &= 0x3f;
113 return (val < 32) ? 1550 - 25 * val
114 : 775 - (25 * (val - 31)) / 2;
Jean Delvared0f28272005-08-01 22:50:08 +0200115
116 case 91: /* VRM 9.1 */
117 case 90: /* VRM 9.0 */
Rudolf Marek177d1652006-04-25 14:24:46 +0200118 val &= 0x1f;
Jean Delvared0f28272005-08-01 22:50:08 +0200119 return(val == 0x1f ? 0 :
120 1850 - val * 25);
121
122 case 85: /* VRM 8.5 */
Rudolf Marek177d1652006-04-25 14:24:46 +0200123 val &= 0x1f;
Jean Delvared0f28272005-08-01 22:50:08 +0200124 return((val & 0x10 ? 25 : 0) +
125 ((val & 0x0f) > 0x04 ? 2050 : 1250) -
126 ((val & 0x0f) * 50));
127
128 case 84: /* VRM 8.4 */
129 val &= 0x0f;
130 /* fall through */
Rudolf Marek734a12a2005-12-18 16:36:52 +0100131 case 82: /* VRM 8.2 */
Rudolf Marek177d1652006-04-25 14:24:46 +0200132 val &= 0x1f;
Jean Delvared0f28272005-08-01 22:50:08 +0200133 return(val == 0x1f ? 0 :
134 val & 0x10 ? 5100 - (val) * 100 :
135 2050 - (val) * 50);
Rudolf Marek734a12a2005-12-18 16:36:52 +0100136 case 17: /* Intel IMVP-II */
Rudolf Marek177d1652006-04-25 14:24:46 +0200137 val &= 0x1f;
Rudolf Marek734a12a2005-12-18 16:36:52 +0100138 return(val & 0x10 ? 975 - (val & 0xF) * 25 :
139 1750 - val * 50);
Jean Delvare4c537fb2006-02-05 23:21:05 +0100140 case 13:
Rudolf Marek177d1652006-04-25 14:24:46 +0200141 val &= 0x3f;
142 return(1708 - val * 16);
Rudolf Marek6af586d2006-06-12 22:00:53 +0200143 case 14: /* Intel Core */
144 /* compute in uV, round to mV */
145 val &= 0x7f;
146 return(val > 0x77 ? 0 : (1500000 - (val * 12500) + 500) / 1000);
Rudolf Marek734a12a2005-12-18 16:36:52 +0100147 default: /* report 0 for unknown */
Jean Delvare45f2acc2007-05-27 22:17:43 +0200148 if (vrm)
149 printk(KERN_WARNING "hwmon-vid: Requested unsupported "
150 "VRM version (%u)\n", (unsigned int)vrm);
Rudolf Marek734a12a2005-12-18 16:36:52 +0100151 return 0;
Jean Delvared0f28272005-08-01 22:50:08 +0200152 }
153}
154
155
156/*
Frank Myhr15872212008-08-06 22:41:06 +0200157 * After this point is the code to automatically determine which
158 * VRM/VRD specification should be used depending on the CPU.
159 */
Jean Delvared0f28272005-08-01 22:50:08 +0200160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161struct vrm_model {
162 u8 vendor;
163 u8 eff_family;
164 u8 eff_model;
Rudolf Marek734a12a2005-12-18 16:36:52 +0100165 u8 eff_stepping;
166 u8 vrm_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167};
168
169#define ANY 0xFF
170
171#ifdef CONFIG_X86
172
Jean Delvarecebd7702008-08-15 10:58:05 +0200173/*
174 * The stepping parameter is highest acceptable stepping for current line.
175 * The model match must be exact for 4-bit values. For model values 0x10
176 * and above (extended model), all models below the parameter will match.
177 */
Rudolf Marek734a12a2005-12-18 16:36:52 +0100178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179static struct vrm_model vrm_models[] = {
Rudolf Marek734a12a2005-12-18 16:36:52 +0100180 {X86_VENDOR_AMD, 0x6, ANY, ANY, 90}, /* Athlon Duron etc */
Jean Delvarecebd7702008-08-15 10:58:05 +0200181 {X86_VENDOR_AMD, 0xF, 0x3F, ANY, 24}, /* Athlon 64, Opteron */
182 {X86_VENDOR_AMD, 0xF, ANY, ANY, 25}, /* NPT family 0Fh */
Jean Delvare1b871822008-10-26 17:04:39 +0100183 {X86_VENDOR_AMD, 0x10, ANY, ANY, 25}, /* NPT family 10h */
Jean Delvare4c537fb2006-02-05 23:21:05 +0100184 {X86_VENDOR_INTEL, 0x6, 0x9, ANY, 13}, /* Pentium M (130 nm) */
Rudolf Marek734a12a2005-12-18 16:36:52 +0100185 {X86_VENDOR_INTEL, 0x6, 0xB, ANY, 85}, /* Tualatin */
Jean Delvare4c537fb2006-02-05 23:21:05 +0100186 {X86_VENDOR_INTEL, 0x6, 0xD, ANY, 13}, /* Pentium M (90 nm) */
Rudolf Marek6af586d2006-06-12 22:00:53 +0200187 {X86_VENDOR_INTEL, 0x6, 0xE, ANY, 14}, /* Intel Core (65 nm) */
188 {X86_VENDOR_INTEL, 0x6, 0xF, ANY, 110}, /* Intel Conroe */
Rudolf Marek734a12a2005-12-18 16:36:52 +0100189 {X86_VENDOR_INTEL, 0x6, ANY, ANY, 82}, /* any P6 */
Rudolf Marek734a12a2005-12-18 16:36:52 +0100190 {X86_VENDOR_INTEL, 0xF, 0x0, ANY, 90}, /* P4 */
191 {X86_VENDOR_INTEL, 0xF, 0x1, ANY, 90}, /* P4 Willamette */
192 {X86_VENDOR_INTEL, 0xF, 0x2, ANY, 90}, /* P4 Northwood */
193 {X86_VENDOR_INTEL, 0xF, ANY, ANY, 100}, /* Prescott and above assume VRD 10 */
Rudolf Marek734a12a2005-12-18 16:36:52 +0100194 {X86_VENDOR_CENTAUR, 0x6, 0x7, ANY, 85}, /* Eden ESP/Ezra */
195 {X86_VENDOR_CENTAUR, 0x6, 0x8, 0x7, 85}, /* Ezra T */
196 {X86_VENDOR_CENTAUR, 0x6, 0x9, 0x7, 85}, /* Nemiah */
Rudolf Mareke46751b2007-05-08 17:21:59 +0200197 {X86_VENDOR_CENTAUR, 0x6, 0x9, ANY, 17}, /* C3-M, Eden-N */
198 {X86_VENDOR_CENTAUR, 0x6, 0xA, 0x7, 0}, /* No information */
199 {X86_VENDOR_CENTAUR, 0x6, 0xA, ANY, 13}, /* C7, Esther */
Rudolf Marek734a12a2005-12-18 16:36:52 +0100200 {X86_VENDOR_UNKNOWN, ANY, ANY, ANY, 0} /* stop here */
Jean Delvareda97a5a2005-07-31 21:54:28 +0200201};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
Rudolf Marek734a12a2005-12-18 16:36:52 +0100203static u8 find_vrm(u8 eff_family, u8 eff_model, u8 eff_stepping, u8 vendor)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204{
205 int i = 0;
206
207 while (vrm_models[i].vendor!=X86_VENDOR_UNKNOWN) {
208 if (vrm_models[i].vendor==vendor)
Jean Delvareda97a5a2005-07-31 21:54:28 +0200209 if ((vrm_models[i].eff_family==eff_family)
210 && ((vrm_models[i].eff_model==eff_model) ||
Jean Delvarecebd7702008-08-15 10:58:05 +0200211 (vrm_models[i].eff_model >= 0x10 &&
212 eff_model <= vrm_models[i].eff_model) ||
Rudolf Marek734a12a2005-12-18 16:36:52 +0100213 (vrm_models[i].eff_model==ANY)) &&
214 (eff_stepping <= vrm_models[i].eff_stepping))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 return vrm_models[i].vrm_type;
216 i++;
217 }
218
219 return 0;
220}
221
Rudolf Marek734a12a2005-12-18 16:36:52 +0100222u8 vid_which_vrm(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223{
Mike Travis92cb7612007-10-19 20:35:04 +0200224 struct cpuinfo_x86 *c = &cpu_data(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 u32 eax;
Rudolf Marek734a12a2005-12-18 16:36:52 +0100226 u8 eff_family, eff_model, eff_stepping, vrm_ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
Jean Delvareda97a5a2005-07-31 21:54:28 +0200228 if (c->x86 < 6) /* Any CPU with family lower than 6 */
229 return 0; /* doesn't have VID and/or CPUID */
230
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 eax = cpuid_eax(1);
232 eff_family = ((eax & 0x00000F00)>>8);
233 eff_model = ((eax & 0x000000F0)>>4);
Rudolf Marek734a12a2005-12-18 16:36:52 +0100234 eff_stepping = eax & 0xF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 if (eff_family == 0xF) { /* use extended model & family */
236 eff_family += ((eax & 0x00F00000)>>20);
237 eff_model += ((eax & 0x000F0000)>>16)<<4;
238 }
Rudolf Marek734a12a2005-12-18 16:36:52 +0100239 vrm_ret = find_vrm(eff_family, eff_model, eff_stepping, c->x86_vendor);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 if (vrm_ret == 0)
Jean Delvareda97a5a2005-07-31 21:54:28 +0200241 printk(KERN_INFO "hwmon-vid: Unknown VRM version of your "
242 "x86 CPU\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 return vrm_ret;
244}
245
Rudolf Marek734a12a2005-12-18 16:36:52 +0100246/* and now for something completely different for the non-x86 world */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247#else
Rudolf Marek734a12a2005-12-18 16:36:52 +0100248u8 vid_which_vrm(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
Jean Delvare303760b2005-07-31 21:52:01 +0200250 printk(KERN_INFO "hwmon-vid: Unknown VRM version of your CPU\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 return 0;
252}
253#endif
254
Jean Delvared0f28272005-08-01 22:50:08 +0200255EXPORT_SYMBOL(vid_from_reg);
Jean Delvare303760b2005-07-31 21:52:01 +0200256EXPORT_SYMBOL(vid_which_vrm);
Jean Delvare96478ef2005-07-31 21:45:27 +0200257
Jean Delvare7188cc62006-12-12 18:18:30 +0100258MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
Jean Delvare96478ef2005-07-31 21:45:27 +0200259
Jean Delvare303760b2005-07-31 21:52:01 +0200260MODULE_DESCRIPTION("hwmon-vid driver");
Jean Delvare96478ef2005-07-31 21:45:27 +0200261MODULE_LICENSE("GPL");