hwmon: (coretemp) Improve support of recent Atom CPU models

[pandora-kernel.git] / Documentation / hwmon / coretemp

diff --git a/Documentation/hwmon/coretemp b/Documentation/hwmon/coretemp
index fa8776a..f6aed44 100644 (file)
--- a/Documentation/hwmon/coretemp
+++ b/Documentation/hwmon/coretemp
@@ -6,7 +6,8 @@ Supported chips:
     Prefix: 'coretemp'
     CPUID: family 0x6, models 0xe (Pentium M DC), 0xf (Core 2 DC 65nm),
                               0x16 (Core 2 SC 65nm), 0x17 (Penryn 45nm),
-                              0x1a (Nehalem), 0x1c (Atom), 0x1e (Lynnfield)
+                              0x1a (Nehalem), 0x1c (Atom), 0x1e (Lynnfield),
+                              0x26 (Tunnel Creek Atom), 0x27 (Medfield Atom)
     Datasheet: Intel 64 and IA-32 Architectures Software Developer's Manual
                Volume 3A: System Programming Guide
                http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
@@ -35,13 +36,6 @@ the Out-Of-Spec bit. Following table summarizes the exported sysfs files:
 All Sysfs entries are named with their core_id (represented here by 'X').
 tempX_input     - Core temperature (in millidegrees Celsius).
 tempX_max       - All cooling devices should be turned on (on Core2).
-                  Initialized with IA32_THERM_INTERRUPT. When the CPU
-                  temperature reaches this temperature, an interrupt is
-                  generated and tempX_max_alarm is set.
-tempX_max_hyst   - If the CPU temperature falls below than temperature,
-                  an interrupt is generated and tempX_max_alarm is reset.
-tempX_max_alarm  - Set if the temperature reaches or exceeds tempX_max.
-                  Reset if the temperature drops to or below tempX_max_hyst.
 tempX_crit      - Maximum junction temperature (in millidegrees Celsius).
 tempX_crit_alarm - Set when Out-of-spec bit is set, never clears.
                   Correct CPU operation is no longer guaranteed.
@@ -49,9 +43,10 @@ tempX_label   - Contains string "Core X", where X is processor
                   number. For Package temp, this will be "Physical id Y",
                   where Y is the package number.
 
-The TjMax temperature is set to 85 degrees C if undocumented model specific
-register (UMSR) 0xee has bit 30 set. If not the TjMax is 100 degrees C as
-(sometimes) documented in processor datasheet.
+On CPU models which support it, TjMax is read from a model-specific register.
+On other models, it is set to an arbitrary value based on weak heuristics.
+If these heuristics don't work for you, you can pass the correct TjMax value
+as a module parameter (tjmax).
 
 Appendix A. Known TjMax lists (TBD):
 Some information comes from ark.intel.com
@@ -71,6 +66,9 @@ Process               Processor                                       TjMax(C)
                U3400                                           105
                P4505/P4500                                     90
 
+32nm           Atom Processors
+               Z2460                                           90
+
 45nm           Xeon Processors 5400 Quad-Core
                X5492, X5482, X5472, X5470, X5460, X5450        85
                E5472, E5462, E5450/40/30/20/10/05              85
@@ -91,6 +89,8 @@ Process               Processor                                       TjMax(C)
                N475/470/455/450                                100
                N280/270                                        90
                330/230                                         125
+               E680/660/640/620                                90
+               E680T/660T/640T/620T                            110
 
 45nm           Core2 Processors
                Solo ULV SU3500/3300                            100