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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) | |
52 | */ | |
53 | ||
54 | /* vrm is the VRM/VRD document version multiplied by 10. | |
55 | val is the 4-, 5- or 6-bit VID code. | |
56 | Returned value is in mV to avoid floating point in the kernel. */ | |
57 | int vid_from_reg(int val, int vrm) | |
58 | { | |
59 | int vid; | |
60 | ||
61 | switch(vrm) { | |
62 | ||
63 | case 0: | |
64 | return 0; | |
65 | ||
66 | case 100: /* VRD 10.0 */ | |
67 | if((val & 0x1f) == 0x1f) | |
68 | return 0; | |
69 | if((val & 0x1f) <= 0x09 || val == 0x0a) | |
70 | vid = 10875 - (val & 0x1f) * 250; | |
71 | else | |
72 | vid = 18625 - (val & 0x1f) * 250; | |
73 | if(val & 0x20) | |
74 | vid -= 125; | |
75 | vid /= 10; /* only return 3 dec. places for now */ | |
76 | return vid; | |
77 | ||
78 | case 24: /* Opteron processor */ | |
79 | return(val == 0x1f ? 0 : 1550 - val * 25); | |
80 | ||
81 | case 91: /* VRM 9.1 */ | |
82 | case 90: /* VRM 9.0 */ | |
83 | return(val == 0x1f ? 0 : | |
84 | 1850 - val * 25); | |
85 | ||
86 | case 85: /* VRM 8.5 */ | |
87 | return((val & 0x10 ? 25 : 0) + | |
88 | ((val & 0x0f) > 0x04 ? 2050 : 1250) - | |
89 | ((val & 0x0f) * 50)); | |
90 | ||
91 | case 84: /* VRM 8.4 */ | |
92 | val &= 0x0f; | |
93 | /* fall through */ | |
94 | default: /* VRM 8.2 */ | |
95 | return(val == 0x1f ? 0 : | |
96 | val & 0x10 ? 5100 - (val) * 100 : | |
97 | 2050 - (val) * 50); | |
98 | } | |
99 | } | |
100 | ||
101 | ||
102 | /* | |
103 | After this point is the code to automatically determine which | |
104 | VRM/VRD specification should be used depending on the CPU. | |
105 | */ | |
106 | ||
1da177e4 LT |
107 | struct vrm_model { |
108 | u8 vendor; | |
109 | u8 eff_family; | |
110 | u8 eff_model; | |
111 | int vrm_type; | |
112 | }; | |
113 | ||
114 | #define ANY 0xFF | |
115 | ||
116 | #ifdef CONFIG_X86 | |
117 | ||
118 | static struct vrm_model vrm_models[] = { | |
119 | {X86_VENDOR_AMD, 0x6, ANY, 90}, /* Athlon Duron etc */ | |
120 | {X86_VENDOR_AMD, 0xF, ANY, 24}, /* Athlon 64, Opteron */ | |
121 | {X86_VENDOR_INTEL, 0x6, 0x9, 85}, /* 0.13um too */ | |
da97a5a3 | 122 | {X86_VENDOR_INTEL, 0x6, 0xB, 85}, /* Tualatin */ |
1da177e4 LT |
123 | {X86_VENDOR_INTEL, 0x6, ANY, 82}, /* any P6 */ |
124 | {X86_VENDOR_INTEL, 0x7, ANY, 0}, /* Itanium */ | |
3b6c0634 RM |
125 | {X86_VENDOR_INTEL, 0xF, 0x0, 90}, /* P4 */ |
126 | {X86_VENDOR_INTEL, 0xF, 0x1, 90}, /* P4 Willamette */ | |
127 | {X86_VENDOR_INTEL, 0xF, 0x2, 90}, /* P4 Northwood */ | |
1da177e4 | 128 | {X86_VENDOR_INTEL, 0xF, 0x3, 100}, /* P4 Prescott */ |
3b6c0634 | 129 | {X86_VENDOR_INTEL, 0xF, 0x4, 100}, /* P4 Prescott */ |
1da177e4 LT |
130 | {X86_VENDOR_INTEL, 0x10,ANY, 0}, /* Itanium 2 */ |
131 | {X86_VENDOR_UNKNOWN, ANY, ANY, 0} /* stop here */ | |
da97a5a3 | 132 | }; |
1da177e4 LT |
133 | |
134 | static int find_vrm(u8 eff_family, u8 eff_model, u8 vendor) | |
135 | { | |
136 | int i = 0; | |
137 | ||
138 | while (vrm_models[i].vendor!=X86_VENDOR_UNKNOWN) { | |
139 | if (vrm_models[i].vendor==vendor) | |
da97a5a3 JD |
140 | if ((vrm_models[i].eff_family==eff_family) |
141 | && ((vrm_models[i].eff_model==eff_model) || | |
142 | (vrm_models[i].eff_model==ANY))) | |
1da177e4 LT |
143 | return vrm_models[i].vrm_type; |
144 | i++; | |
145 | } | |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
303760b4 | 150 | int vid_which_vrm(void) |
1da177e4 LT |
151 | { |
152 | struct cpuinfo_x86 *c = cpu_data; | |
153 | u32 eax; | |
154 | u8 eff_family, eff_model; | |
155 | int vrm_ret; | |
156 | ||
da97a5a3 JD |
157 | if (c->x86 < 6) /* Any CPU with family lower than 6 */ |
158 | return 0; /* doesn't have VID and/or CPUID */ | |
159 | ||
1da177e4 LT |
160 | eax = cpuid_eax(1); |
161 | eff_family = ((eax & 0x00000F00)>>8); | |
162 | eff_model = ((eax & 0x000000F0)>>4); | |
163 | if (eff_family == 0xF) { /* use extended model & family */ | |
164 | eff_family += ((eax & 0x00F00000)>>20); | |
165 | eff_model += ((eax & 0x000F0000)>>16)<<4; | |
166 | } | |
167 | vrm_ret = find_vrm(eff_family,eff_model,c->x86_vendor); | |
168 | if (vrm_ret == 0) | |
da97a5a3 JD |
169 | printk(KERN_INFO "hwmon-vid: Unknown VRM version of your " |
170 | "x86 CPU\n"); | |
1da177e4 LT |
171 | return vrm_ret; |
172 | } | |
173 | ||
da97a5a3 | 174 | /* and now something completely different for the non-x86 world */ |
1da177e4 | 175 | #else |
303760b4 | 176 | int vid_which_vrm(void) |
1da177e4 | 177 | { |
303760b4 | 178 | printk(KERN_INFO "hwmon-vid: Unknown VRM version of your CPU\n"); |
1da177e4 LT |
179 | return 0; |
180 | } | |
181 | #endif | |
182 | ||
d0f28270 | 183 | EXPORT_SYMBOL(vid_from_reg); |
303760b4 | 184 | EXPORT_SYMBOL(vid_which_vrm); |
96478ef3 JD |
185 | |
186 | MODULE_AUTHOR("Rudolf Marek <r.marek@sh.cvut.cz>"); | |
187 | ||
303760b4 | 188 | MODULE_DESCRIPTION("hwmon-vid driver"); |
96478ef3 | 189 | MODULE_LICENSE("GPL"); |