Commit | Line | Data |
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1da177e4 | 1 | /* |
303760b4 | 2 | hwmon-vid.c - VID/VRM/VRD voltage conversions |
1da177e4 | 3 | |
7188cc66 | 4 | Copyright (c) 2004 Rudolf Marek <r.marek@assembler.cz> |
1da177e4 | 5 | |
d0f28270 JD |
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 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
25 | #include <linux/module.h> |
26 | #include <linux/kernel.h> | |
303760b4 | 27 | #include <linux/hwmon-vid.h> |
1da177e4 | 28 | |
d0f28270 JD |
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 Opteron processors don't follow the Intel specifications. | |
41 | I'm going to "make up" 2.4 as the spec number for the Opterons. | |
42 | No good reason just a mnemonic for the 24x Opteron processor | |
43 | series. | |
44 | ||
45 | Opteron VID encoding is: | |
46 | 00000 = 1.550 V | |
47 | 00001 = 1.525 V | |
48 | . . . . | |
49 | 11110 = 0.800 V | |
50 | 11111 = 0.000 V (off) | |
734a12a3 RM |
51 | |
52 | The 17 specification is in fact Intel Mobile Voltage Positioning - | |
53 | (IMVP-II). You can find more information in the datasheet of Max1718 | |
54 | http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2452 | |
55 | ||
4c537fb2 JD |
56 | The 13 specification corresponds to the Intel Pentium M series. There |
57 | doesn't seem to be any named specification for these. The conversion | |
58 | tables are detailed directly in the various Pentium M datasheets: | |
59 | http://www.intel.com/design/intarch/pentiumm/docs_pentiumm.htm | |
6af586dc RM |
60 | |
61 | The 14 specification corresponds to Intel Core series. There | |
62 | doesn't seem to be any named specification for these. The conversion | |
63 | tables are detailed directly in the various Pentium Core datasheets: | |
64 | http://www.intel.com/design/mobile/datashts/309221.htm | |
65 | ||
66 | The 110 (VRM 11) specification corresponds to Intel Conroe based series. | |
67 | http://www.intel.com/design/processor/applnots/313214.htm | |
d0f28270 JD |
68 | */ |
69 | ||
70 | /* vrm is the VRM/VRD document version multiplied by 10. | |
6af586dc RM |
71 | val is the 4-bit or more VID code. |
72 | Returned value is in mV to avoid floating point in the kernel. | |
73 | Some VID have some bits in uV scale, this is rounded to mV */ | |
734a12a3 | 74 | int vid_from_reg(int val, u8 vrm) |
d0f28270 JD |
75 | { |
76 | int vid; | |
77 | ||
78 | switch(vrm) { | |
79 | ||
d0f28270 | 80 | case 100: /* VRD 10.0 */ |
6af586dc | 81 | /* compute in uV, round to mV */ |
177d165d | 82 | val &= 0x3f; |
d0f28270 JD |
83 | if((val & 0x1f) == 0x1f) |
84 | return 0; | |
85 | if((val & 0x1f) <= 0x09 || val == 0x0a) | |
6af586dc | 86 | vid = 1087500 - (val & 0x1f) * 25000; |
d0f28270 | 87 | else |
6af586dc | 88 | vid = 1862500 - (val & 0x1f) * 25000; |
d0f28270 | 89 | if(val & 0x20) |
6af586dc RM |
90 | vid -= 12500; |
91 | return((vid + 500) / 1000); | |
d0f28270 | 92 | |
6af586dc RM |
93 | case 110: /* Intel Conroe */ |
94 | /* compute in uV, round to mV */ | |
95 | val &= 0xff; | |
9fab2d8b | 96 | if (val < 0x02 || val > 0xb2) |
6af586dc RM |
97 | return 0; |
98 | return((1600000 - (val - 2) * 6250 + 500) / 1000); | |
d0f28270 | 99 | case 24: /* Opteron processor */ |
177d165d | 100 | val &= 0x1f; |
d0f28270 JD |
101 | return(val == 0x1f ? 0 : 1550 - val * 25); |
102 | ||
103 | case 91: /* VRM 9.1 */ | |
104 | case 90: /* VRM 9.0 */ | |
177d165d | 105 | val &= 0x1f; |
d0f28270 JD |
106 | return(val == 0x1f ? 0 : |
107 | 1850 - val * 25); | |
108 | ||
109 | case 85: /* VRM 8.5 */ | |
177d165d | 110 | val &= 0x1f; |
d0f28270 JD |
111 | return((val & 0x10 ? 25 : 0) + |
112 | ((val & 0x0f) > 0x04 ? 2050 : 1250) - | |
113 | ((val & 0x0f) * 50)); | |
114 | ||
115 | case 84: /* VRM 8.4 */ | |
116 | val &= 0x0f; | |
117 | /* fall through */ | |
734a12a3 | 118 | case 82: /* VRM 8.2 */ |
177d165d | 119 | val &= 0x1f; |
d0f28270 JD |
120 | return(val == 0x1f ? 0 : |
121 | val & 0x10 ? 5100 - (val) * 100 : | |
122 | 2050 - (val) * 50); | |
734a12a3 | 123 | case 17: /* Intel IMVP-II */ |
177d165d | 124 | val &= 0x1f; |
734a12a3 RM |
125 | return(val & 0x10 ? 975 - (val & 0xF) * 25 : |
126 | 1750 - val * 50); | |
4c537fb2 | 127 | case 13: |
177d165d RM |
128 | val &= 0x3f; |
129 | return(1708 - val * 16); | |
6af586dc RM |
130 | case 14: /* Intel Core */ |
131 | /* compute in uV, round to mV */ | |
132 | val &= 0x7f; | |
133 | return(val > 0x77 ? 0 : (1500000 - (val * 12500) + 500) / 1000); | |
734a12a3 | 134 | default: /* report 0 for unknown */ |
45f2acc4 JD |
135 | if (vrm) |
136 | printk(KERN_WARNING "hwmon-vid: Requested unsupported " | |
137 | "VRM version (%u)\n", (unsigned int)vrm); | |
734a12a3 | 138 | return 0; |
d0f28270 JD |
139 | } |
140 | } | |
141 | ||
142 | ||
143 | /* | |
144 | After this point is the code to automatically determine which | |
145 | VRM/VRD specification should be used depending on the CPU. | |
146 | */ | |
147 | ||
1da177e4 LT |
148 | struct vrm_model { |
149 | u8 vendor; | |
150 | u8 eff_family; | |
151 | u8 eff_model; | |
734a12a3 RM |
152 | u8 eff_stepping; |
153 | u8 vrm_type; | |
1da177e4 LT |
154 | }; |
155 | ||
156 | #define ANY 0xFF | |
157 | ||
158 | #ifdef CONFIG_X86 | |
159 | ||
734a12a3 RM |
160 | /* the stepping parameter is highest acceptable stepping for current line */ |
161 | ||
1da177e4 | 162 | static struct vrm_model vrm_models[] = { |
734a12a3 RM |
163 | {X86_VENDOR_AMD, 0x6, ANY, ANY, 90}, /* Athlon Duron etc */ |
164 | {X86_VENDOR_AMD, 0xF, ANY, ANY, 24}, /* Athlon 64, Opteron and above VRM 24 */ | |
4c537fb2 | 165 | {X86_VENDOR_INTEL, 0x6, 0x9, ANY, 13}, /* Pentium M (130 nm) */ |
734a12a3 | 166 | {X86_VENDOR_INTEL, 0x6, 0xB, ANY, 85}, /* Tualatin */ |
4c537fb2 | 167 | {X86_VENDOR_INTEL, 0x6, 0xD, ANY, 13}, /* Pentium M (90 nm) */ |
6af586dc RM |
168 | {X86_VENDOR_INTEL, 0x6, 0xE, ANY, 14}, /* Intel Core (65 nm) */ |
169 | {X86_VENDOR_INTEL, 0x6, 0xF, ANY, 110}, /* Intel Conroe */ | |
734a12a3 | 170 | {X86_VENDOR_INTEL, 0x6, ANY, ANY, 82}, /* any P6 */ |
734a12a3 RM |
171 | {X86_VENDOR_INTEL, 0xF, 0x0, ANY, 90}, /* P4 */ |
172 | {X86_VENDOR_INTEL, 0xF, 0x1, ANY, 90}, /* P4 Willamette */ | |
173 | {X86_VENDOR_INTEL, 0xF, 0x2, ANY, 90}, /* P4 Northwood */ | |
174 | {X86_VENDOR_INTEL, 0xF, ANY, ANY, 100}, /* Prescott and above assume VRD 10 */ | |
734a12a3 RM |
175 | {X86_VENDOR_CENTAUR, 0x6, 0x7, ANY, 85}, /* Eden ESP/Ezra */ |
176 | {X86_VENDOR_CENTAUR, 0x6, 0x8, 0x7, 85}, /* Ezra T */ | |
177 | {X86_VENDOR_CENTAUR, 0x6, 0x9, 0x7, 85}, /* Nemiah */ | |
e46751bf RM |
178 | {X86_VENDOR_CENTAUR, 0x6, 0x9, ANY, 17}, /* C3-M, Eden-N */ |
179 | {X86_VENDOR_CENTAUR, 0x6, 0xA, 0x7, 0}, /* No information */ | |
180 | {X86_VENDOR_CENTAUR, 0x6, 0xA, ANY, 13}, /* C7, Esther */ | |
734a12a3 | 181 | {X86_VENDOR_UNKNOWN, ANY, ANY, ANY, 0} /* stop here */ |
da97a5a3 | 182 | }; |
1da177e4 | 183 | |
734a12a3 | 184 | static u8 find_vrm(u8 eff_family, u8 eff_model, u8 eff_stepping, u8 vendor) |
1da177e4 LT |
185 | { |
186 | int i = 0; | |
187 | ||
188 | while (vrm_models[i].vendor!=X86_VENDOR_UNKNOWN) { | |
189 | if (vrm_models[i].vendor==vendor) | |
da97a5a3 JD |
190 | if ((vrm_models[i].eff_family==eff_family) |
191 | && ((vrm_models[i].eff_model==eff_model) || | |
734a12a3 RM |
192 | (vrm_models[i].eff_model==ANY)) && |
193 | (eff_stepping <= vrm_models[i].eff_stepping)) | |
1da177e4 LT |
194 | return vrm_models[i].vrm_type; |
195 | i++; | |
196 | } | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
734a12a3 | 201 | u8 vid_which_vrm(void) |
1da177e4 LT |
202 | { |
203 | struct cpuinfo_x86 *c = cpu_data; | |
204 | u32 eax; | |
734a12a3 | 205 | u8 eff_family, eff_model, eff_stepping, vrm_ret; |
1da177e4 | 206 | |
da97a5a3 JD |
207 | if (c->x86 < 6) /* Any CPU with family lower than 6 */ |
208 | return 0; /* doesn't have VID and/or CPUID */ | |
209 | ||
1da177e4 LT |
210 | eax = cpuid_eax(1); |
211 | eff_family = ((eax & 0x00000F00)>>8); | |
212 | eff_model = ((eax & 0x000000F0)>>4); | |
734a12a3 | 213 | eff_stepping = eax & 0xF; |
1da177e4 LT |
214 | if (eff_family == 0xF) { /* use extended model & family */ |
215 | eff_family += ((eax & 0x00F00000)>>20); | |
216 | eff_model += ((eax & 0x000F0000)>>16)<<4; | |
217 | } | |
734a12a3 | 218 | vrm_ret = find_vrm(eff_family, eff_model, eff_stepping, c->x86_vendor); |
1da177e4 | 219 | if (vrm_ret == 0) |
da97a5a3 JD |
220 | printk(KERN_INFO "hwmon-vid: Unknown VRM version of your " |
221 | "x86 CPU\n"); | |
1da177e4 LT |
222 | return vrm_ret; |
223 | } | |
224 | ||
734a12a3 | 225 | /* and now for something completely different for the non-x86 world */ |
1da177e4 | 226 | #else |
734a12a3 | 227 | u8 vid_which_vrm(void) |
1da177e4 | 228 | { |
303760b4 | 229 | printk(KERN_INFO "hwmon-vid: Unknown VRM version of your CPU\n"); |
1da177e4 LT |
230 | return 0; |
231 | } | |
232 | #endif | |
233 | ||
d0f28270 | 234 | EXPORT_SYMBOL(vid_from_reg); |
303760b4 | 235 | EXPORT_SYMBOL(vid_which_vrm); |
96478ef3 | 236 | |
7188cc66 | 237 | MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>"); |
96478ef3 | 238 | |
303760b4 | 239 | MODULE_DESCRIPTION("hwmon-vid driver"); |
96478ef3 | 240 | MODULE_LICENSE("GPL"); |