Commit | Line | Data |
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1da177e4 | 1 | /* |
303760b4 | 2 | hwmon-vid.c - VID/VRM/VRD voltage conversions |
1da177e4 LT |
3 | |
4 | Copyright (c) 2004 Rudolf Marek <r.marek@sh.cvut.cz> | |
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 | ||
25 | #include <linux/config.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/kernel.h> | |
303760b4 | 28 | #include <linux/hwmon-vid.h> |
1da177e4 | 29 | |
d0f28270 JD |
30 | /* |
31 | Common code for decoding VID pins. | |
32 | ||
33 | References: | |
34 | ||
35 | For VRM 8.4 to 9.1, "VRM x.y DC-DC Converter Design Guidelines", | |
36 | available at http://developer.intel.com/. | |
37 | ||
38 | For VRD 10.0 and up, "VRD x.y Design Guide", | |
39 | available at http://developer.intel.com/. | |
40 | ||
41 | AMD Opteron processors don't follow the Intel specifications. | |
42 | I'm going to "make up" 2.4 as the spec number for the Opterons. | |
43 | No good reason just a mnemonic for the 24x Opteron processor | |
44 | series. | |
45 | ||
46 | Opteron VID encoding is: | |
47 | 00000 = 1.550 V | |
48 | 00001 = 1.525 V | |
49 | . . . . | |
50 | 11110 = 0.800 V | |
51 | 11111 = 0.000 V (off) | |
734a12a3 RM |
52 | |
53 | The 17 specification is in fact Intel Mobile Voltage Positioning - | |
54 | (IMVP-II). You can find more information in the datasheet of Max1718 | |
55 | http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2452 | |
56 | ||
d0f28270 JD |
57 | */ |
58 | ||
59 | /* vrm is the VRM/VRD document version multiplied by 10. | |
60 | val is the 4-, 5- or 6-bit VID code. | |
61 | Returned value is in mV to avoid floating point in the kernel. */ | |
734a12a3 | 62 | int vid_from_reg(int val, u8 vrm) |
d0f28270 JD |
63 | { |
64 | int vid; | |
65 | ||
66 | switch(vrm) { | |
67 | ||
d0f28270 JD |
68 | case 100: /* VRD 10.0 */ |
69 | if((val & 0x1f) == 0x1f) | |
70 | return 0; | |
71 | if((val & 0x1f) <= 0x09 || val == 0x0a) | |
72 | vid = 10875 - (val & 0x1f) * 250; | |
73 | else | |
74 | vid = 18625 - (val & 0x1f) * 250; | |
75 | if(val & 0x20) | |
76 | vid -= 125; | |
77 | vid /= 10; /* only return 3 dec. places for now */ | |
78 | return vid; | |
79 | ||
80 | case 24: /* Opteron processor */ | |
81 | return(val == 0x1f ? 0 : 1550 - val * 25); | |
82 | ||
83 | case 91: /* VRM 9.1 */ | |
84 | case 90: /* VRM 9.0 */ | |
85 | return(val == 0x1f ? 0 : | |
86 | 1850 - val * 25); | |
87 | ||
88 | case 85: /* VRM 8.5 */ | |
89 | return((val & 0x10 ? 25 : 0) + | |
90 | ((val & 0x0f) > 0x04 ? 2050 : 1250) - | |
91 | ((val & 0x0f) * 50)); | |
92 | ||
93 | case 84: /* VRM 8.4 */ | |
94 | val &= 0x0f; | |
95 | /* fall through */ | |
734a12a3 | 96 | case 82: /* VRM 8.2 */ |
d0f28270 JD |
97 | return(val == 0x1f ? 0 : |
98 | val & 0x10 ? 5100 - (val) * 100 : | |
99 | 2050 - (val) * 50); | |
734a12a3 RM |
100 | case 17: /* Intel IMVP-II */ |
101 | return(val & 0x10 ? 975 - (val & 0xF) * 25 : | |
102 | 1750 - val * 50); | |
103 | default: /* report 0 for unknown */ | |
104 | printk(KERN_INFO "hwmon-vid: requested unknown VRM version\n"); | |
105 | return 0; | |
d0f28270 JD |
106 | } |
107 | } | |
108 | ||
109 | ||
110 | /* | |
111 | After this point is the code to automatically determine which | |
112 | VRM/VRD specification should be used depending on the CPU. | |
113 | */ | |
114 | ||
1da177e4 LT |
115 | struct vrm_model { |
116 | u8 vendor; | |
117 | u8 eff_family; | |
118 | u8 eff_model; | |
734a12a3 RM |
119 | u8 eff_stepping; |
120 | u8 vrm_type; | |
1da177e4 LT |
121 | }; |
122 | ||
123 | #define ANY 0xFF | |
124 | ||
125 | #ifdef CONFIG_X86 | |
126 | ||
734a12a3 RM |
127 | /* the stepping parameter is highest acceptable stepping for current line */ |
128 | ||
1da177e4 | 129 | static struct vrm_model vrm_models[] = { |
734a12a3 RM |
130 | {X86_VENDOR_AMD, 0x6, ANY, ANY, 90}, /* Athlon Duron etc */ |
131 | {X86_VENDOR_AMD, 0xF, ANY, ANY, 24}, /* Athlon 64, Opteron and above VRM 24 */ | |
132 | {X86_VENDOR_INTEL, 0x6, 0x9, ANY, 85}, /* 0.13um too */ | |
133 | {X86_VENDOR_INTEL, 0x6, 0xB, ANY, 85}, /* Tualatin */ | |
134 | {X86_VENDOR_INTEL, 0x6, ANY, ANY, 82}, /* any P6 */ | |
135 | {X86_VENDOR_INTEL, 0x7, ANY, ANY, 0}, /* Itanium */ | |
136 | {X86_VENDOR_INTEL, 0xF, 0x0, ANY, 90}, /* P4 */ | |
137 | {X86_VENDOR_INTEL, 0xF, 0x1, ANY, 90}, /* P4 Willamette */ | |
138 | {X86_VENDOR_INTEL, 0xF, 0x2, ANY, 90}, /* P4 Northwood */ | |
139 | {X86_VENDOR_INTEL, 0xF, ANY, ANY, 100}, /* Prescott and above assume VRD 10 */ | |
140 | {X86_VENDOR_INTEL, 0x10, ANY, ANY, 0}, /* Itanium 2 */ | |
141 | {X86_VENDOR_CENTAUR, 0x6, 0x7, ANY, 85}, /* Eden ESP/Ezra */ | |
142 | {X86_VENDOR_CENTAUR, 0x6, 0x8, 0x7, 85}, /* Ezra T */ | |
143 | {X86_VENDOR_CENTAUR, 0x6, 0x9, 0x7, 85}, /* Nemiah */ | |
144 | {X86_VENDOR_CENTAUR, 0x6, 0x9, ANY, 17}, /* C3-M */ | |
145 | {X86_VENDOR_UNKNOWN, ANY, ANY, ANY, 0} /* stop here */ | |
da97a5a3 | 146 | }; |
1da177e4 | 147 | |
734a12a3 | 148 | static u8 find_vrm(u8 eff_family, u8 eff_model, u8 eff_stepping, u8 vendor) |
1da177e4 LT |
149 | { |
150 | int i = 0; | |
151 | ||
152 | while (vrm_models[i].vendor!=X86_VENDOR_UNKNOWN) { | |
153 | if (vrm_models[i].vendor==vendor) | |
da97a5a3 JD |
154 | if ((vrm_models[i].eff_family==eff_family) |
155 | && ((vrm_models[i].eff_model==eff_model) || | |
734a12a3 RM |
156 | (vrm_models[i].eff_model==ANY)) && |
157 | (eff_stepping <= vrm_models[i].eff_stepping)) | |
1da177e4 LT |
158 | return vrm_models[i].vrm_type; |
159 | i++; | |
160 | } | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
734a12a3 | 165 | u8 vid_which_vrm(void) |
1da177e4 LT |
166 | { |
167 | struct cpuinfo_x86 *c = cpu_data; | |
168 | u32 eax; | |
734a12a3 | 169 | u8 eff_family, eff_model, eff_stepping, vrm_ret; |
1da177e4 | 170 | |
da97a5a3 JD |
171 | if (c->x86 < 6) /* Any CPU with family lower than 6 */ |
172 | return 0; /* doesn't have VID and/or CPUID */ | |
173 | ||
1da177e4 LT |
174 | eax = cpuid_eax(1); |
175 | eff_family = ((eax & 0x00000F00)>>8); | |
176 | eff_model = ((eax & 0x000000F0)>>4); | |
734a12a3 | 177 | eff_stepping = eax & 0xF; |
1da177e4 LT |
178 | if (eff_family == 0xF) { /* use extended model & family */ |
179 | eff_family += ((eax & 0x00F00000)>>20); | |
180 | eff_model += ((eax & 0x000F0000)>>16)<<4; | |
181 | } | |
734a12a3 | 182 | vrm_ret = find_vrm(eff_family, eff_model, eff_stepping, c->x86_vendor); |
1da177e4 | 183 | if (vrm_ret == 0) |
da97a5a3 JD |
184 | printk(KERN_INFO "hwmon-vid: Unknown VRM version of your " |
185 | "x86 CPU\n"); | |
1da177e4 LT |
186 | return vrm_ret; |
187 | } | |
188 | ||
734a12a3 | 189 | /* and now for something completely different for the non-x86 world */ |
1da177e4 | 190 | #else |
734a12a3 | 191 | u8 vid_which_vrm(void) |
1da177e4 | 192 | { |
303760b4 | 193 | printk(KERN_INFO "hwmon-vid: Unknown VRM version of your CPU\n"); |
1da177e4 LT |
194 | return 0; |
195 | } | |
196 | #endif | |
197 | ||
d0f28270 | 198 | EXPORT_SYMBOL(vid_from_reg); |
303760b4 | 199 | EXPORT_SYMBOL(vid_which_vrm); |
96478ef3 JD |
200 | |
201 | MODULE_AUTHOR("Rudolf Marek <r.marek@sh.cvut.cz>"); | |
202 | ||
303760b4 | 203 | MODULE_DESCRIPTION("hwmon-vid driver"); |
96478ef3 | 204 | MODULE_LICENSE("GPL"); |