[linux-2.6-block.git] / drivers / cpufreq / Kconfig.x86

#
# x86 CPU Frequency scaling drivers
#

config X86_INTEL_PSTATE
       bool "Intel P state control"
       depends on X86
       help
          This driver provides a P state for Intel core processors.
	  The driver implements an internal governor and will become
          the scaling driver and governor for Sandy bridge processors.

	  When this driver is enabled it will become the preferred
          scaling driver for Sandy bridge processors.

	  If in doubt, say N.

config X86_PCC_CPUFREQ
	tristate "Processor Clocking Control interface driver"
	depends on ACPI && ACPI_PROCESSOR
	help
	  This driver adds support for the PCC interface.

	  For details, take a look at:
	  <file:Documentation/cpu-freq/pcc-cpufreq.txt>.

	  To compile this driver as a module, choose M here: the
	  module will be called pcc-cpufreq.

	  If in doubt, say N.

config X86_ACPI_CPUFREQ
	tristate "ACPI Processor P-States driver"
	depends on ACPI_PROCESSOR
	help
	  This driver adds a CPUFreq driver which utilizes the ACPI
	  Processor Performance States.
	  This driver also supports Intel Enhanced Speedstep and newer
	  AMD CPUs.

	  To compile this driver as a module, choose M here: the
	  module will be called acpi-cpufreq.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_ACPI_CPUFREQ_CPB
	default y
	bool "Legacy cpb sysfs knob support for AMD CPUs"
	depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD
	help
	  The powernow-k8 driver used to provide a sysfs knob called "cpb"
	  to disable the Core Performance Boosting feature of AMD CPUs. This
	  file has now been superseded by the more generic "boost" entry.

	  By enabling this option the acpi_cpufreq driver provides the old
	  entry in addition to the new boost ones, for compatibility reasons.

config X86_SFI_CPUFREQ
	tristate "SFI Performance-States driver"
	depends on X86_INTEL_MID && SFI
	help
	  This adds a CPUFreq driver for some Silvermont based Intel Atom
	  architectures like Z34xx and Z35xx which enumerate processor
	  performance states through SFI.

	  If in doubt, say N.

config ELAN_CPUFREQ
	tristate "AMD Elan SC400 and SC410"
	depends on MELAN
	---help---
	  This adds the CPUFreq driver for AMD Elan SC400 and SC410
	  processors.

	  You need to specify the processor maximum speed as boot
	  parameter: elanfreq=maxspeed (in kHz) or as module
	  parameter "max_freq".

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config SC520_CPUFREQ
	tristate "AMD Elan SC520"
	depends on MELAN
	---help---
	  This adds the CPUFreq driver for AMD Elan SC520 processor.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.


config X86_POWERNOW_K6
	tristate "AMD Mobile K6-2/K6-3 PowerNow!"
	depends on X86_32
	help
	  This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
	  AMD K6-3+ processors.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_POWERNOW_K7
	tristate "AMD Mobile Athlon/Duron PowerNow!"
	depends on X86_32
	help
	  This adds the CPUFreq driver for mobile AMD K7 mobile processors.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_POWERNOW_K7_ACPI
	bool
	depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
	depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
	depends on X86_32
	default y

config X86_POWERNOW_K8
	tristate "AMD Opteron/Athlon64 PowerNow!"
	depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
	help
	  This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
	  Support for K10 and newer processors is now in acpi-cpufreq.

	  To compile this driver as a module, choose M here: the
	  module will be called powernow-k8.

	  For details, take a look at <file:Documentation/cpu-freq/>.

config X86_AMD_FREQ_SENSITIVITY
	tristate "AMD frequency sensitivity feedback powersave bias"
	depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD
	help
	  This adds AMD-specific powersave bias function to the ondemand
	  governor, which allows it to make more power-conscious frequency
	  change decisions based on feedback from hardware (available on AMD
	  Family 16h and above).

	  Hardware feedback tells software how "sensitive" to frequency changes
	  the CPUs' workloads are. CPU-bound workloads will be more sensitive
	  -- they will perform better as frequency increases. Memory/IO-bound
	  workloads will be less sensitive -- they will not necessarily perform
	  better as frequency increases.

	  If in doubt, say N.

config X86_GX_SUSPMOD
	tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
	depends on X86_32 && PCI
	help
	 This add the CPUFreq driver for NatSemi Geode processors which
	 support suspend modulation.

	 For details, take a look at <file:Documentation/cpu-freq/>.

	 If in doubt, say N.

config X86_SPEEDSTEP_CENTRINO
	tristate "Intel Enhanced SpeedStep (deprecated)"
	select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
	depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
	help
	  This is deprecated and this functionality is now merged into
	  acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
	  speedstep_centrino.
	  This adds the CPUFreq driver for Enhanced SpeedStep enabled
	  mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
	  or 64bit enabled Intel Xeons.

	  To compile this driver as a module, choose M here: the
	  module will be called speedstep-centrino.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_SPEEDSTEP_CENTRINO_TABLE
	bool "Built-in tables for Banias CPUs"
	depends on X86_32 && X86_SPEEDSTEP_CENTRINO
	default y
	help
	  Use built-in tables for Banias CPUs if ACPI encoding
	  is not available.

	  If in doubt, say N.

config X86_SPEEDSTEP_ICH
	tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
	depends on X86_32
	help
	  This adds the CPUFreq driver for certain mobile Intel Pentium III
	  (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
	  mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
	  ICH3 or ICH4 southbridge.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_SPEEDSTEP_SMI
	tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
	depends on X86_32
	help
	  This adds the CPUFreq driver for certain mobile Intel Pentium III
	  (Coppermine), all mobile Intel Pentium III-M (Tualatin)
	  on systems which have an Intel 440BX/ZX/MX southbridge.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_P4_CLOCKMOD
	tristate "Intel Pentium 4 clock modulation"
	help
	  This adds the CPUFreq driver for Intel Pentium 4 / XEON
	  processors.  When enabled it will lower CPU temperature by skipping
	  clocks.

	  This driver should be only used in exceptional
	  circumstances when very low power is needed because it causes severe
	  slowdowns and noticeable latencies.  Normally Speedstep should be used
	  instead.

	  To compile this driver as a module, choose M here: the
	  module will be called p4-clockmod.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  Unless you are absolutely sure say N.

config X86_CPUFREQ_NFORCE2
	tristate "nVidia nForce2 FSB changing"
	depends on X86_32
	help
	  This adds the CPUFreq driver for FSB changing on nVidia nForce2
	  platforms.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_LONGRUN
	tristate "Transmeta LongRun"
	depends on X86_32
	help
	  This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
	  which support LongRun.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_LONGHAUL
	tristate "VIA Cyrix III Longhaul"
	depends on X86_32 && ACPI_PROCESSOR
	help
	  This adds the CPUFreq driver for VIA Samuel/CyrixIII,
	  VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
	  processors.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.
Commit	Line	Data
1da177e4	1	#
bb0a56ec	2	# x86 CPU Frequency scaling drivers
1da177e4 LT	3	#
1da177e4 LT	4
93f0822d	5	config X86_INTEL_PSTATE
da0d9fda	6	bool "Intel P state control"
93f0822d DB	7	depends on X86
	8	help
	9	This driver provides a P state for Intel core processors.
	10	The driver implements an internal governor and will become
	11	the scaling driver and governor for Sandy bridge processors.
	12
735dc249	13	When this driver is enabled it will become the preferred
93f0822d DB	14	scaling driver for Sandy bridge processors.
93f0822d DB	15
93f0822d DB	16	If in doubt, say N.
93f0822d DB	17
0f1d683f NC	18	config X86_PCC_CPUFREQ
	19	tristate "Processor Clocking Control interface driver"
	20	depends on ACPI && ACPI_PROCESSOR
	21	help
	22	This driver adds support for the PCC interface.
	23
	24	For details, take a look at:
	25	<file:Documentation/cpu-freq/pcc-cpufreq.txt>.
	26
	27	To compile this driver as a module, choose M here: the
	28	module will be called pcc-cpufreq.
	29
	30	If in doubt, say N.
	31
1da177e4 LT	32	config X86_ACPI_CPUFREQ
1da177e4 LT	33	tristate "ACPI Processor P-States driver"
1da177e4 LT	34	depends on ACPI_PROCESSOR
	35	help
	36	This driver adds a CPUFreq driver which utilizes the ACPI
	37	Processor Performance States.
3dc9a633 MG	38	This driver also supports Intel Enhanced Speedstep and newer
3dc9a633 MG	39	AMD CPUs.
1da177e4	40
e8ef9522 SR	41	To compile this driver as a module, choose M here: the
	42	module will be called acpi-cpufreq.
	43
1da177e4 LT	44	For details, take a look at <file:Documentation/cpu-freq/>.
	45
	46	If in doubt, say N.
	47
11269ff5 AP	48	config X86_ACPI_CPUFREQ_CPB
	49	default y
	50	bool "Legacy cpb sysfs knob support for AMD CPUs"
	51	depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD
	52	help
	53	The powernow-k8 driver used to provide a sysfs knob called "cpb"
	54	to disable the Core Performance Boosting feature of AMD CPUs. This
735dc249	55	file has now been superseded by the more generic "boost" entry.
11269ff5 AP	56
	57	By enabling this option the acpi_cpufreq driver provides the old
	58	entry in addition to the new boost ones, for compatibility reasons.
	59
e7ddf4b7 SK	60	config X86_SFI_CPUFREQ
	61	tristate "SFI Performance-States driver"
	62	depends on X86_INTEL_MID && SFI
	63	help
	64	This adds a CPUFreq driver for some Silvermont based Intel Atom
	65	architectures like Z34xx and Z35xx which enumerate processor
	66	performance states through SFI.
	67
	68	If in doubt, say N.
	69
1da177e4	70	config ELAN_CPUFREQ
bf6fc9fd	71	tristate "AMD Elan SC400 and SC410"
ce9c99af	72	depends on MELAN
1da177e4 LT	73	---help---
	74	This adds the CPUFreq driver for AMD Elan SC400 and SC410
	75	processors.
	76
	77	You need to specify the processor maximum speed as boot
	78	parameter: elanfreq=maxspeed (in kHz) or as module
	79	parameter "max_freq".
	80
	81	For details, take a look at <file:Documentation/cpu-freq/>.
	82
	83	If in doubt, say N.
	84
bf6fc9fd DJ	85	config SC520_CPUFREQ
bf6fc9fd DJ	86	tristate "AMD Elan SC520"
ce9c99af	87	depends on MELAN
bf6fc9fd DJ	88	---help---
	89	This adds the CPUFreq driver for AMD Elan SC520 processor.
	90
	91	For details, take a look at <file:Documentation/cpu-freq/>.
	92
	93	If in doubt, say N.
	94
	95
1da177e4 LT	96	config X86_POWERNOW_K6
1da177e4 LT	97	tristate "AMD Mobile K6-2/K6-3 PowerNow!"
e8ef9522	98	depends on X86_32
1da177e4 LT	99	help
	100	This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
	101	AMD K6-3+ processors.
	102
	103	For details, take a look at <file:Documentation/cpu-freq/>.
	104
	105	If in doubt, say N.
	106
	107	config X86_POWERNOW_K7
	108	tristate "AMD Mobile Athlon/Duron PowerNow!"
e8ef9522	109	depends on X86_32
1da177e4 LT	110	help
	111	This adds the CPUFreq driver for mobile AMD K7 mobile processors.
	112
	113	For details, take a look at <file:Documentation/cpu-freq/>.
	114
	115	If in doubt, say N.
	116
	117	config X86_POWERNOW_K7_ACPI
	118	bool
	119	depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
	120	depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
e8ef9522	121	depends on X86_32
1da177e4 LT	122	default y
	123
	124	config X86_POWERNOW_K8
	125	tristate "AMD Opteron/Athlon64 PowerNow!"
631e8ac1	126	depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
1da177e4	127	help
034be8fd AP	128	This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
034be8fd AP	129	Support for K10 and newer processors is now in acpi-cpufreq.
1da177e4	130
e8ef9522 SR	131	To compile this driver as a module, choose M here: the
	132	module will be called powernow-k8.
	133
1da177e4 LT	134	For details, take a look at <file:Documentation/cpu-freq/>.
1da177e4 LT	135
9c5320c8 JS	136	config X86_AMD_FREQ_SENSITIVITY
	137	tristate "AMD frequency sensitivity feedback powersave bias"
	138	depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD
	139	help
	140	This adds AMD-specific powersave bias function to the ondemand
	141	governor, which allows it to make more power-conscious frequency
8c88126b	142	change decisions based on feedback from hardware (available on AMD
9c5320c8 JS	143	Family 16h and above).
	144
	145	Hardware feedback tells software how "sensitive" to frequency changes
	146	the CPUs' workloads are. CPU-bound workloads will be more sensitive
	147	-- they will perform better as frequency increases. Memory/IO-bound
	148	workloads will be less sensitive -- they will not necessarily perform
	149	better as frequency increases.
	150
	151	If in doubt, say N.
	152
1da177e4 LT	153	config X86_GX_SUSPMOD
1da177e4 LT	154	tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
e8ef9522	155	depends on X86_32 && PCI
1da177e4 LT	156	help
	157	This add the CPUFreq driver for NatSemi Geode processors which
	158	support suspend modulation.
	159
	160	For details, take a look at <file:Documentation/cpu-freq/>.
	161
	162	If in doubt, say N.
	163
	164	config X86_SPEEDSTEP_CENTRINO
e8ef9522	165	tristate "Intel Enhanced SpeedStep (deprecated)"
e8ef9522 SR	166	select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
e8ef9522 SR	167	depends on X86_32 \|\| (X86_64 && ACPI_PROCESSOR)
1da177e4	168	help
e8ef9522 SR	169	This is deprecated and this functionality is now merged into
	170	acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
	171	speedstep_centrino.
1da177e4	172	This adds the CPUFreq driver for Enhanced SpeedStep enabled
e8ef9522 SR	173	mobile CPUs. This means Intel Pentium M (Centrino) CPUs
	174	or 64bit enabled Intel Xeons.
	175
	176	To compile this driver as a module, choose M here: the
	177	module will be called speedstep-centrino.
388d6c51	178
1da177e4	179	For details, take a look at <file:Documentation/cpu-freq/>.
388d6c51	180
1da177e4 LT	181	If in doubt, say N.
1da177e4 LT	182
1da177e4 LT	183	config X86_SPEEDSTEP_CENTRINO_TABLE
1da177e4 LT	184	bool "Built-in tables for Banias CPUs"
e8ef9522	185	depends on X86_32 && X86_SPEEDSTEP_CENTRINO
1da177e4 LT	186	default y
	187	help
	188	Use built-in tables for Banias CPUs if ACPI encoding
	189	is not available.
	190
	191	If in doubt, say N.
	192
	193	config X86_SPEEDSTEP_ICH
	194	tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
e8ef9522	195	depends on X86_32
1da177e4 LT	196	help
	197	This adds the CPUFreq driver for certain mobile Intel Pentium III
	198	(Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
388d6c51	199	mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
1da177e4 LT	200	ICH3 or ICH4 southbridge.
	201
	202	For details, take a look at <file:Documentation/cpu-freq/>.
	203
	204	If in doubt, say N.
	205
	206	config X86_SPEEDSTEP_SMI
	207	tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
0f194b56	208	depends on X86_32
1da177e4 LT	209	help
1da177e4 LT	210	This adds the CPUFreq driver for certain mobile Intel Pentium III
388d6c51	211	(Coppermine), all mobile Intel Pentium III-M (Tualatin)
1da177e4 LT	212	on systems which have an Intel 440BX/ZX/MX southbridge.
	213
	214	For details, take a look at <file:Documentation/cpu-freq/>.
	215
	216	If in doubt, say N.
	217
	218	config X86_P4_CLOCKMOD
	219	tristate "Intel Pentium 4 clock modulation"
1da177e4 LT	220	help
1da177e4 LT	221	This adds the CPUFreq driver for Intel Pentium 4 / XEON
e8ef9522 SR	222	processors. When enabled it will lower CPU temperature by skipping
	223	clocks.
	224
	225	This driver should be only used in exceptional
	226	circumstances when very low power is needed because it causes severe
	227	slowdowns and noticeable latencies. Normally Speedstep should be used
	228	instead.
	229
	230	To compile this driver as a module, choose M here: the
	231	module will be called p4-clockmod.
1da177e4 LT	232
	233	For details, take a look at <file:Documentation/cpu-freq/>.
	234
e8ef9522	235	Unless you are absolutely sure say N.
1da177e4 LT	236
	237	config X86_CPUFREQ_NFORCE2
	238	tristate "nVidia nForce2 FSB changing"
0f194b56	239	depends on X86_32
1da177e4 LT	240	help
	241	This adds the CPUFreq driver for FSB changing on nVidia nForce2
	242	platforms.
	243
	244	For details, take a look at <file:Documentation/cpu-freq/>.
	245
	246	If in doubt, say N.
	247
	248	config X86_LONGRUN
	249	tristate "Transmeta LongRun"
e8ef9522	250	depends on X86_32
1da177e4 LT	251	help
	252	This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
	253	which support LongRun.
	254
	255	For details, take a look at <file:Documentation/cpu-freq/>.
	256
	257	If in doubt, say N.
	258
	259	config X86_LONGHAUL
	260	tristate "VIA Cyrix III Longhaul"
e8ef9522	261	depends on X86_32 && ACPI_PROCESSOR
1da177e4	262	help
388d6c51 DJ	263	This adds the CPUFreq driver for VIA Samuel/CyrixIII,
388d6c51 DJ	264	VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
1da177e4 LT	265	processors.
	266
	267	For details, take a look at <file:Documentation/cpu-freq/>.
	268
	269	If in doubt, say N.
	270