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git.proxmox.com Git - mirror_ubuntu-artful-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@sh.cvut.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/config.h>
26 #include <linux/module.h>
27 #include <linux/kernel.h>
28 #include <linux/hwmon-vid.h>
31 Common code for decoding VID pins.
35 For VRM 8.4 to 9.1, "VRM x.y DC-DC Converter Design Guidelines",
36 available at http://developer.intel.com/.
38 For VRD 10.0 and up, "VRD x.y Design Guide",
39 available at http://developer.intel.com/.
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
46 Opteron VID encoding is:
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
57 The 13 specification corresponds to the Intel Pentium M series. There
58 doesn't seem to be any named specification for these. The conversion
59 tables are detailed directly in the various Pentium M datasheets:
60 http://www.intel.com/design/intarch/pentiumm/docs_pentiumm.htm
62 The 14 specification corresponds to Intel Core series. There
63 doesn't seem to be any named specification for these. The conversion
64 tables are detailed directly in the various Pentium Core datasheets:
65 http://www.intel.com/design/mobile/datashts/309221.htm
67 The 110 (VRM 11) specification corresponds to Intel Conroe based series.
68 http://www.intel.com/design/processor/applnots/313214.htm
71 /* vrm is the VRM/VRD document version multiplied by 10.
72 val is the 4-bit or more VID code.
73 Returned value is in mV to avoid floating point in the kernel.
74 Some VID have some bits in uV scale, this is rounded to mV */
75 int vid_from_reg(int val
, u8 vrm
)
81 case 100: /* VRD 10.0 */
82 /* compute in uV, round to mV */
84 if((val
& 0x1f) == 0x1f)
86 if((val
& 0x1f) <= 0x09 || val
== 0x0a)
87 vid
= 1087500 - (val
& 0x1f) * 25000;
89 vid
= 1862500 - (val
& 0x1f) * 25000;
92 return((vid
+ 500) / 1000);
94 case 110: /* Intel Conroe */
95 /* compute in uV, round to mV */
97 if(((val
& 0x7e) == 0xfe) || (!(val
& 0x7e)))
99 return((1600000 - (val
- 2) * 6250 + 500) / 1000);
100 case 24: /* Opteron processor */
102 return(val
== 0x1f ? 0 : 1550 - val
* 25);
104 case 91: /* VRM 9.1 */
105 case 90: /* VRM 9.0 */
107 return(val
== 0x1f ? 0 :
110 case 85: /* VRM 8.5 */
112 return((val
& 0x10 ? 25 : 0) +
113 ((val
& 0x0f) > 0x04 ? 2050 : 1250) -
114 ((val
& 0x0f) * 50));
116 case 84: /* VRM 8.4 */
119 case 82: /* VRM 8.2 */
121 return(val
== 0x1f ? 0 :
122 val
& 0x10 ? 5100 - (val
) * 100 :
124 case 17: /* Intel IMVP-II */
126 return(val
& 0x10 ? 975 - (val
& 0xF) * 25 :
130 return(1708 - val
* 16);
131 case 14: /* Intel Core */
132 /* compute in uV, round to mV */
134 return(val
> 0x77 ? 0 : (1500000 - (val
* 12500) + 500) / 1000);
135 default: /* report 0 for unknown */
136 printk(KERN_INFO
"hwmon-vid: requested unknown VRM version\n");
143 After this point is the code to automatically determine which
144 VRM/VRD specification should be used depending on the CPU.
159 /* the stepping parameter is highest acceptable stepping for current line */
161 static struct vrm_model vrm_models
[] = {
162 {X86_VENDOR_AMD
, 0x6, ANY
, ANY
, 90}, /* Athlon Duron etc */
163 {X86_VENDOR_AMD
, 0xF, ANY
, ANY
, 24}, /* Athlon 64, Opteron and above VRM 24 */
164 {X86_VENDOR_INTEL
, 0x6, 0x9, ANY
, 13}, /* Pentium M (130 nm) */
165 {X86_VENDOR_INTEL
, 0x6, 0xB, ANY
, 85}, /* Tualatin */
166 {X86_VENDOR_INTEL
, 0x6, 0xD, ANY
, 13}, /* Pentium M (90 nm) */
167 {X86_VENDOR_INTEL
, 0x6, 0xE, ANY
, 14}, /* Intel Core (65 nm) */
168 {X86_VENDOR_INTEL
, 0x6, 0xF, ANY
, 110}, /* Intel Conroe */
169 {X86_VENDOR_INTEL
, 0x6, ANY
, ANY
, 82}, /* any P6 */
170 {X86_VENDOR_INTEL
, 0x7, ANY
, ANY
, 0}, /* Itanium */
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 */
175 {X86_VENDOR_INTEL
, 0x10, ANY
, ANY
, 0}, /* Itanium 2 */
176 {X86_VENDOR_CENTAUR
, 0x6, 0x7, ANY
, 85}, /* Eden ESP/Ezra */
177 {X86_VENDOR_CENTAUR
, 0x6, 0x8, 0x7, 85}, /* Ezra T */
178 {X86_VENDOR_CENTAUR
, 0x6, 0x9, 0x7, 85}, /* Nemiah */
179 {X86_VENDOR_CENTAUR
, 0x6, 0x9, ANY
, 17}, /* C3-M */
180 {X86_VENDOR_UNKNOWN
, ANY
, ANY
, ANY
, 0} /* stop here */
183 static u8
find_vrm(u8 eff_family
, u8 eff_model
, u8 eff_stepping
, u8 vendor
)
187 while (vrm_models
[i
].vendor
!=X86_VENDOR_UNKNOWN
) {
188 if (vrm_models
[i
].vendor
==vendor
)
189 if ((vrm_models
[i
].eff_family
==eff_family
)
190 && ((vrm_models
[i
].eff_model
==eff_model
) ||
191 (vrm_models
[i
].eff_model
==ANY
)) &&
192 (eff_stepping
<= vrm_models
[i
].eff_stepping
))
193 return vrm_models
[i
].vrm_type
;
200 u8
vid_which_vrm(void)
202 struct cpuinfo_x86
*c
= cpu_data
;
204 u8 eff_family
, eff_model
, eff_stepping
, vrm_ret
;
206 if (c
->x86
< 6) /* Any CPU with family lower than 6 */
207 return 0; /* doesn't have VID and/or CPUID */
210 eff_family
= ((eax
& 0x00000F00)>>8);
211 eff_model
= ((eax
& 0x000000F0)>>4);
212 eff_stepping
= eax
& 0xF;
213 if (eff_family
== 0xF) { /* use extended model & family */
214 eff_family
+= ((eax
& 0x00F00000)>>20);
215 eff_model
+= ((eax
& 0x000F0000)>>16)<<4;
217 vrm_ret
= find_vrm(eff_family
, eff_model
, eff_stepping
, c
->x86_vendor
);
219 printk(KERN_INFO
"hwmon-vid: Unknown VRM version of your "
224 /* and now for something completely different for the non-x86 world */
226 u8
vid_which_vrm(void)
228 printk(KERN_INFO
"hwmon-vid: Unknown VRM version of your CPU\n");
233 EXPORT_SYMBOL(vid_from_reg
);
234 EXPORT_SYMBOL(vid_which_vrm
);
236 MODULE_AUTHOR("Rudolf Marek <r.marek@sh.cvut.cz>");
238 MODULE_DESCRIPTION("hwmon-vid driver");
239 MODULE_LICENSE("GPL");