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1#
2# CPU Frequency scaling
3#
4
5menu "CPU Frequency scaling"
6
7source "drivers/cpufreq/Kconfig"
8
9if CPU_FREQ
10
11comment "CPUFreq processor drivers"
12
13config X86_ACPI_CPUFREQ
14	tristate "ACPI Processor P-States driver"
15	select CPU_FREQ_TABLE
16	depends on ACPI_PROCESSOR
17	help
18	  This driver adds a CPUFreq driver which utilizes the ACPI
19	  Processor Performance States.
20	  This driver also supports Intel Enhanced Speedstep.
21
22	  To compile this driver as a module, choose M here: the
23	  module will be called acpi-cpufreq.
24
25	  For details, take a look at <file:Documentation/cpu-freq/>.
26
27	  If in doubt, say N.
28
29config ELAN_CPUFREQ
30	tristate "AMD Elan SC400 and SC410"
31	select CPU_FREQ_TABLE
32	depends on X86_ELAN
33	---help---
34	  This adds the CPUFreq driver for AMD Elan SC400 and SC410
35	  processors.
36
37	  You need to specify the processor maximum speed as boot
38	  parameter: elanfreq=maxspeed (in kHz) or as module
39	  parameter "max_freq".
40
41	  For details, take a look at <file:Documentation/cpu-freq/>.
42
43	  If in doubt, say N.
44
45config SC520_CPUFREQ
46	tristate "AMD Elan SC520"
47	select CPU_FREQ_TABLE
48	depends on X86_ELAN
49	---help---
50	  This adds the CPUFreq driver for AMD Elan SC520 processor.
51
52	  For details, take a look at <file:Documentation/cpu-freq/>.
53
54	  If in doubt, say N.
55
56
57config X86_POWERNOW_K6
58	tristate "AMD Mobile K6-2/K6-3 PowerNow!"
59	select CPU_FREQ_TABLE
60	depends on X86_32
61	help
62	  This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
63	  AMD K6-3+ processors.
64
65	  For details, take a look at <file:Documentation/cpu-freq/>.
66
67	  If in doubt, say N.
68
69config X86_POWERNOW_K7
70	tristate "AMD Mobile Athlon/Duron PowerNow!"
71	select CPU_FREQ_TABLE
72	depends on X86_32
73	help
74	  This adds the CPUFreq driver for mobile AMD K7 mobile processors.
75
76	  For details, take a look at <file:Documentation/cpu-freq/>.
77
78	  If in doubt, say N.
79
80config X86_POWERNOW_K7_ACPI
81	bool
82	depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
83	depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
84	depends on X86_32
85	default y
86
87config X86_POWERNOW_K8
88	tristate "AMD Opteron/Athlon64 PowerNow!"
89	select CPU_FREQ_TABLE
90	help
91	  This adds the CPUFreq driver for mobile AMD Opteron/Athlon64 processors.
92
93	  To compile this driver as a module, choose M here: the
94	  module will be called powernow-k8.
95
96	  For details, take a look at <file:Documentation/cpu-freq/>.
97
98	  If in doubt, say N.
99
100config X86_POWERNOW_K8_ACPI
101	bool
102	prompt "ACPI Support" if X86_32
103	depends on ACPI && X86_POWERNOW_K8 && ACPI_PROCESSOR
104	depends on !(X86_POWERNOW_K8 = y && ACPI_PROCESSOR = m)
105	default y
106	help
107	  This provides access to the K8s Processor Performance States via ACPI.
108	  This driver is probably required for CPUFreq to work with multi-socket and
109	  SMP systems.  It is not required on at least some single-socket yet
110	  multi-core systems, even if SMP is enabled.
111
112	  It is safe to say Y here.
113
114config X86_GX_SUSPMOD
115	tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
116	depends on X86_32 && PCI
117	help
118	 This add the CPUFreq driver for NatSemi Geode processors which
119	 support suspend modulation.
120
121	 For details, take a look at <file:Documentation/cpu-freq/>.
122
123	 If in doubt, say N.
124
125config X86_SPEEDSTEP_CENTRINO
126	tristate "Intel Enhanced SpeedStep (deprecated)"
127	select CPU_FREQ_TABLE
128	select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
129	depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
130	help
131	  This is deprecated and this functionality is now merged into
132	  acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
133	  speedstep_centrino.
134	  This adds the CPUFreq driver for Enhanced SpeedStep enabled
135	  mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
136	  or 64bit enabled Intel Xeons.
137
138	  To compile this driver as a module, choose M here: the
139	  module will be called speedstep-centrino.
140
141	  For details, take a look at <file:Documentation/cpu-freq/>.
142
143	  If in doubt, say N.
144
145config X86_SPEEDSTEP_CENTRINO_TABLE
146	bool "Built-in tables for Banias CPUs"
147	depends on X86_32 && X86_SPEEDSTEP_CENTRINO
148	default y
149	help
150	  Use built-in tables for Banias CPUs if ACPI encoding
151	  is not available.
152
153	  If in doubt, say N.
154
155config X86_SPEEDSTEP_ICH
156	tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
157	select CPU_FREQ_TABLE
158	depends on X86_32
159	help
160	  This adds the CPUFreq driver for certain mobile Intel Pentium III
161	  (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
162	  mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
163	  ICH3 or ICH4 southbridge.
164
165	  For details, take a look at <file:Documentation/cpu-freq/>.
166
167	  If in doubt, say N.
168
169config X86_SPEEDSTEP_SMI
170	tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
171	select CPU_FREQ_TABLE
172	depends on X86_32 && EXPERIMENTAL
173	help
174	  This adds the CPUFreq driver for certain mobile Intel Pentium III
175	  (Coppermine), all mobile Intel Pentium III-M (Tualatin)
176	  on systems which have an Intel 440BX/ZX/MX southbridge.
177
178	  For details, take a look at <file:Documentation/cpu-freq/>.
179
180	  If in doubt, say N.
181
182config X86_P4_CLOCKMOD
183	tristate "Intel Pentium 4 clock modulation"
184	select CPU_FREQ_TABLE
185	help
186	  This adds the CPUFreq driver for Intel Pentium 4 / XEON
187	  processors.  When enabled it will lower CPU temperature by skipping
188	  clocks.
189
190	  This driver should be only used in exceptional
191	  circumstances when very low power is needed because it causes severe
192	  slowdowns and noticeable latencies.  Normally Speedstep should be used
193	  instead.
194
195	  To compile this driver as a module, choose M here: the
196	  module will be called p4-clockmod.
197
198	  For details, take a look at <file:Documentation/cpu-freq/>.
199
200	  Unless you are absolutely sure say N.
201
202config X86_CPUFREQ_NFORCE2
203	tristate "nVidia nForce2 FSB changing"
204	depends on X86_32 && EXPERIMENTAL
205	help
206	  This adds the CPUFreq driver for FSB changing on nVidia nForce2
207	  platforms.
208
209	  For details, take a look at <file:Documentation/cpu-freq/>.
210
211	  If in doubt, say N.
212
213config X86_LONGRUN
214	tristate "Transmeta LongRun"
215	depends on X86_32
216	help
217	  This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
218	  which support LongRun.
219
220	  For details, take a look at <file:Documentation/cpu-freq/>.
221
222	  If in doubt, say N.
223
224config X86_LONGHAUL
225	tristate "VIA Cyrix III Longhaul"
226	select CPU_FREQ_TABLE
227	depends on X86_32 && ACPI_PROCESSOR
228	help
229	  This adds the CPUFreq driver for VIA Samuel/CyrixIII,
230	  VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
231	  processors.
232
233	  For details, take a look at <file:Documentation/cpu-freq/>.
234
235	  If in doubt, say N.
236
237config X86_E_POWERSAVER
238	tristate "VIA C7 Enhanced PowerSaver"
239	select CPU_FREQ_TABLE
240	depends on X86_32
241	help
242	  This adds the CPUFreq driver for VIA C7 processors.
243
244	  If in doubt, say N.
245
246comment "shared options"
247
248config X86_SPEEDSTEP_LIB
249	tristate
250	default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
251
252config X86_SPEEDSTEP_RELAXED_CAP_CHECK
253	bool "Relaxed speedstep capability checks"
254	depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
255	help
256	  Don't perform all checks for a speedstep capable system which would
257	  normally be done. Some ancient or strange systems, though speedstep
258	  capable, don't always indicate that they are speedstep capable. This
259	  option lets the probing code bypass some of those checks if the
260	  parameter "relaxed_check=1" is passed to the module.
261
262endif	# CPU_FREQ
263
264endmenu
265