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1 | /* | |
2 | * 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 | */ | |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/hwmon-vid.h> | |
28 | ||
29 | /* | |
30 | * 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 | * | |
40 | * 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, | |
49 | * http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/32559.pdf | |
50 | * Table 71. VID Code Voltages | |
51 | * 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 | |
55 | * | |
56 | * 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 | */ | |
73 | ||
74 | /* | |
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 | */ | |
80 | int vid_from_reg(int val, u8 vrm) | |
81 | { | |
82 | int vid; | |
83 | ||
84 | switch(vrm) { | |
85 | ||
86 | case 100: /* VRD 10.0 */ | |
87 | /* compute in uV, round to mV */ | |
88 | val &= 0x3f; | |
89 | if((val & 0x1f) == 0x1f) | |
90 | return 0; | |
91 | if((val & 0x1f) <= 0x09 || val == 0x0a) | |
92 | vid = 1087500 - (val & 0x1f) * 25000; | |
93 | else | |
94 | vid = 1862500 - (val & 0x1f) * 25000; | |
95 | if(val & 0x20) | |
96 | vid -= 12500; | |
97 | return((vid + 500) / 1000); | |
98 | ||
99 | case 110: /* Intel Conroe */ | |
100 | /* compute in uV, round to mV */ | |
101 | val &= 0xff; | |
102 | if (val < 0x02 || val > 0xb2) | |
103 | return 0; | |
104 | return((1600000 - (val - 2) * 6250 + 500) / 1000); | |
105 | ||
106 | case 24: /* Athlon64 & Opteron */ | |
107 | val &= 0x1f; | |
108 | if (val == 0x1f) | |
109 | return 0; | |
110 | /* fall through */ | |
111 | case 25: /* AMD NPT 0Fh */ | |
112 | val &= 0x3f; | |
113 | return (val < 32) ? 1550 - 25 * val | |
114 | : 775 - (25 * (val - 31)) / 2; | |
115 | ||
116 | case 91: /* VRM 9.1 */ | |
117 | case 90: /* VRM 9.0 */ | |
118 | val &= 0x1f; | |
119 | return(val == 0x1f ? 0 : | |
120 | 1850 - val * 25); | |
121 | ||
122 | case 85: /* VRM 8.5 */ | |
123 | val &= 0x1f; | |
124 | 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 */ | |
131 | case 82: /* VRM 8.2 */ | |
132 | val &= 0x1f; | |
133 | return(val == 0x1f ? 0 : | |
134 | val & 0x10 ? 5100 - (val) * 100 : | |
135 | 2050 - (val) * 50); | |
136 | case 17: /* Intel IMVP-II */ | |
137 | val &= 0x1f; | |
138 | return(val & 0x10 ? 975 - (val & 0xF) * 25 : | |
139 | 1750 - val * 50); | |
140 | case 13: | |
141 | val &= 0x3f; | |
142 | return(1708 - val * 16); | |
143 | case 14: /* Intel Core */ | |
144 | /* compute in uV, round to mV */ | |
145 | val &= 0x7f; | |
146 | return(val > 0x77 ? 0 : (1500000 - (val * 12500) + 500) / 1000); | |
147 | default: /* report 0 for unknown */ | |
148 | if (vrm) | |
149 | printk(KERN_WARNING "hwmon-vid: Requested unsupported " | |
150 | "VRM version (%u)\n", (unsigned int)vrm); | |
151 | return 0; | |
152 | } | |
153 | } | |
154 | ||
155 | ||
156 | /* | |
157 | * After this point is the code to automatically determine which | |
158 | * VRM/VRD specification should be used depending on the CPU. | |
159 | */ | |
160 | ||
161 | struct vrm_model { | |
162 | u8 vendor; | |
163 | u8 eff_family; | |
164 | u8 eff_model; | |
165 | u8 eff_stepping; | |
166 | u8 vrm_type; | |
167 | }; | |
168 | ||
169 | #define ANY 0xFF | |
170 | ||
171 | #ifdef CONFIG_X86 | |
172 | ||
173 | /* | |
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 | */ | |
178 | ||
179 | static struct vrm_model vrm_models[] = { | |
180 | {X86_VENDOR_AMD, 0x6, ANY, ANY, 90}, /* Athlon Duron etc */ | |
181 | {X86_VENDOR_AMD, 0xF, 0x3F, ANY, 24}, /* Athlon 64, Opteron */ | |
182 | {X86_VENDOR_AMD, 0xF, ANY, ANY, 25}, /* NPT family 0Fh */ | |
183 | {X86_VENDOR_AMD, 0x10, ANY, ANY, 25}, /* NPT family 10h */ | |
184 | {X86_VENDOR_INTEL, 0x6, 0x9, ANY, 13}, /* Pentium M (130 nm) */ | |
185 | {X86_VENDOR_INTEL, 0x6, 0xB, ANY, 85}, /* Tualatin */ | |
186 | {X86_VENDOR_INTEL, 0x6, 0xD, ANY, 13}, /* Pentium M (90 nm) */ | |
187 | {X86_VENDOR_INTEL, 0x6, 0xE, ANY, 14}, /* Intel Core (65 nm) */ | |
188 | {X86_VENDOR_INTEL, 0x6, 0xF, ANY, 110}, /* Intel Conroe */ | |
189 | {X86_VENDOR_INTEL, 0x6, ANY, ANY, 82}, /* any P6 */ | |
190 | {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 */ | |
194 | {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 */ | |
197 | {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 */ | |
200 | {X86_VENDOR_UNKNOWN, ANY, ANY, ANY, 0} /* stop here */ | |
201 | }; | |
202 | ||
203 | static u8 find_vrm(u8 eff_family, u8 eff_model, u8 eff_stepping, u8 vendor) | |
204 | { | |
205 | int i = 0; | |
206 | ||
207 | while (vrm_models[i].vendor!=X86_VENDOR_UNKNOWN) { | |
208 | if (vrm_models[i].vendor==vendor) | |
209 | if ((vrm_models[i].eff_family==eff_family) | |
210 | && ((vrm_models[i].eff_model==eff_model) || | |
211 | (vrm_models[i].eff_model >= 0x10 && | |
212 | eff_model <= vrm_models[i].eff_model) || | |
213 | (vrm_models[i].eff_model==ANY)) && | |
214 | (eff_stepping <= vrm_models[i].eff_stepping)) | |
215 | return vrm_models[i].vrm_type; | |
216 | i++; | |
217 | } | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | u8 vid_which_vrm(void) | |
223 | { | |
224 | struct cpuinfo_x86 *c = &cpu_data(0); | |
225 | u32 eax; | |
226 | u8 eff_family, eff_model, eff_stepping, vrm_ret; | |
227 | ||
228 | if (c->x86 < 6) /* Any CPU with family lower than 6 */ | |
229 | return 0; /* doesn't have VID and/or CPUID */ | |
230 | ||
231 | eax = cpuid_eax(1); | |
232 | eff_family = ((eax & 0x00000F00)>>8); | |
233 | eff_model = ((eax & 0x000000F0)>>4); | |
234 | eff_stepping = eax & 0xF; | |
235 | if (eff_family == 0xF) { /* use extended model & family */ | |
236 | eff_family += ((eax & 0x00F00000)>>20); | |
237 | eff_model += ((eax & 0x000F0000)>>16)<<4; | |
238 | } | |
239 | vrm_ret = find_vrm(eff_family, eff_model, eff_stepping, c->x86_vendor); | |
240 | if (vrm_ret == 0) | |
241 | printk(KERN_INFO "hwmon-vid: Unknown VRM version of your " | |
242 | "x86 CPU\n"); | |
243 | return vrm_ret; | |
244 | } | |
245 | ||
246 | /* and now for something completely different for the non-x86 world */ | |
247 | #else | |
248 | u8 vid_which_vrm(void) | |
249 | { | |
250 | printk(KERN_INFO "hwmon-vid: Unknown VRM version of your CPU\n"); | |
251 | return 0; | |
252 | } | |
253 | #endif | |
254 | ||
255 | EXPORT_SYMBOL(vid_from_reg); | |
256 | EXPORT_SYMBOL(vid_which_vrm); | |
257 | ||
258 | MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>"); | |
259 | ||
260 | MODULE_DESCRIPTION("hwmon-vid driver"); | |
261 | MODULE_LICENSE("GPL"); |