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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - drivers/hwmon/hwmon-vid.c
2 * hwmon-vid.c - VID/VRM/VRD voltage conversions
4 * Copyright (c) 2004 Rudolf Marek <r.marek@assembler.cz>
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>
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.
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.
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.
25 #include <linux/module.h>
26 #include <linux/kernel.h>
27 #include <linux/hwmon-vid.h>
30 * Common code for decoding VID pins.
34 * For VRM 8.4 to 9.1, "VRM x.y DC-DC Converter Design Guidelines",
35 * available at http://developer.intel.com/.
37 * For VRD 10.0 and up, "VRD x.y Design Guide",
38 * available at http://developer.intel.com/.
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
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
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
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
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
70 * The 110 (VRM 11) specification corresponds to Intel Conroe based series.
71 * http://www.intel.com/design/processor/applnots/313214.htm
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.
80 int vid_from_reg(int val
, u8 vrm
)
86 case 100: /* VRD 10.0 */
87 /* compute in uV, round to mV */
89 if((val
& 0x1f) == 0x1f)
91 if((val
& 0x1f) <= 0x09 || val
== 0x0a)
92 vid
= 1087500 - (val
& 0x1f) * 25000;
94 vid
= 1862500 - (val
& 0x1f) * 25000;
97 return((vid
+ 500) / 1000);
99 case 110: /* Intel Conroe */
100 /* compute in uV, round to mV */
102 if (val
< 0x02 || val
> 0xb2)
104 return((1600000 - (val
- 2) * 6250 + 500) / 1000);
106 case 24: /* Athlon64 & Opteron */
111 case 25: /* AMD NPT 0Fh */
113 return (val
< 32) ? 1550 - 25 * val
114 : 775 - (25 * (val
- 31)) / 2;
116 case 91: /* VRM 9.1 */
117 case 90: /* VRM 9.0 */
119 return(val
== 0x1f ? 0 :
122 case 85: /* VRM 8.5 */
124 return((val
& 0x10 ? 25 : 0) +
125 ((val
& 0x0f) > 0x04 ? 2050 : 1250) -
126 ((val
& 0x0f) * 50));
128 case 84: /* VRM 8.4 */
131 case 82: /* VRM 8.2 */
133 return(val
== 0x1f ? 0 :
134 val
& 0x10 ? 5100 - (val
) * 100 :
136 case 17: /* Intel IMVP-II */
138 return(val
& 0x10 ? 975 - (val
& 0xF) * 25 :
142 return(1708 - val
* 16);
143 case 14: /* Intel Core */
144 /* compute in uV, round to mV */
146 return(val
> 0x77 ? 0 : (1500000 - (val
* 12500) + 500) / 1000);
147 default: /* report 0 for unknown */
149 printk(KERN_WARNING
"hwmon-vid: Requested unsupported "
150 "VRM version (%u)\n", (unsigned int)vrm
);
157 * After this point is the code to automatically determine which
158 * VRM/VRD specification should be used depending on the CPU.
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.
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 */
203 static u8
find_vrm(u8 eff_family
, u8 eff_model
, u8 eff_stepping
, u8 vendor
)
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
;
222 u8
vid_which_vrm(void)
224 struct cpuinfo_x86
*c
= &cpu_data(0);
226 u8 eff_family
, eff_model
, eff_stepping
, vrm_ret
;
228 if (c
->x86
< 6) /* Any CPU with family lower than 6 */
229 return 0; /* doesn't have VID and/or CPUID */
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;
239 vrm_ret
= find_vrm(eff_family
, eff_model
, eff_stepping
, c
->x86_vendor
);
241 printk(KERN_INFO
"hwmon-vid: Unknown VRM version of your "
246 /* and now for something completely different for the non-x86 world */
248 u8
vid_which_vrm(void)
250 printk(KERN_INFO
"hwmon-vid: Unknown VRM version of your CPU\n");
255 EXPORT_SYMBOL(vid_from_reg
);
256 EXPORT_SYMBOL(vid_which_vrm
);
258 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
260 MODULE_DESCRIPTION("hwmon-vid driver");
261 MODULE_LICENSE("GPL");