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_PCC_CPUFREQ
14	tristate "Processor Clocking Control interface driver"
15	depends on ACPI && ACPI_PROCESSOR
16	help
17	  This driver adds support for the PCC interface.
18
19	  For details, take a look at:
20	  <file:Documentation/cpu-freq/pcc-cpufreq.txt>.
21
22	  To compile this driver as a module, choose M here: the
23	  module will be called pcc-cpufreq.
24
25	  If in doubt, say N.
26
27config X86_ACPI_CPUFREQ
28	tristate "ACPI Processor P-States driver"
29	select CPU_FREQ_TABLE
30	depends on ACPI_PROCESSOR
31	help
32	  This driver adds a CPUFreq driver which utilizes the ACPI
33	  Processor Performance States.
34	  This driver also supports Intel Enhanced Speedstep.
35
36	  To compile this driver as a module, choose M here: the
37	  module will be called acpi-cpufreq.
38
39	  For details, take a look at <file:Documentation/cpu-freq/>.
40
41	  If in doubt, say N.
42
43config ELAN_CPUFREQ
44	tristate "AMD Elan SC400 and SC410"
45	select CPU_FREQ_TABLE
46	depends on X86_ELAN
47	---help---
48	  This adds the CPUFreq driver for AMD Elan SC400 and SC410
49	  processors.
50
51	  You need to specify the processor maximum speed as boot
52	  parameter: elanfreq=maxspeed (in kHz) or as module
53	  parameter "max_freq".
54
55	  For details, take a look at <file:Documentation/cpu-freq/>.
56
57	  If in doubt, say N.
58
59config SC520_CPUFREQ
60	tristate "AMD Elan SC520"
61	select CPU_FREQ_TABLE
62	depends on X86_ELAN
63	---help---
64	  This adds the CPUFreq driver for AMD Elan SC520 processor.
65
66	  For details, take a look at <file:Documentation/cpu-freq/>.
67
68	  If in doubt, say N.
69
70
71config X86_POWERNOW_K6
72	tristate "AMD Mobile K6-2/K6-3 PowerNow!"
73	select CPU_FREQ_TABLE
74	depends on X86_32
75	help
76	  This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
77	  AMD K6-3+ processors.
78
79	  For details, take a look at <file:Documentation/cpu-freq/>.
80
81	  If in doubt, say N.
82
83config X86_POWERNOW_K7
84	tristate "AMD Mobile Athlon/Duron PowerNow!"
85	select CPU_FREQ_TABLE
86	depends on X86_32
87	help
88	  This adds the CPUFreq driver for mobile AMD K7 mobile processors.
89
90	  For details, take a look at <file:Documentation/cpu-freq/>.
91
92	  If in doubt, say N.
93
94config X86_POWERNOW_K7_ACPI
95	bool
96	depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
97	depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
98	depends on X86_32
99	default y
100
101config X86_POWERNOW_K8
102	tristate "AMD Opteron/Athlon64 PowerNow!"
103	select CPU_FREQ_TABLE
104	depends on ACPI && ACPI_PROCESSOR
105	help
106	  This adds the CPUFreq driver for K8/K10 Opteron/Athlon64 processors.
107
108	  To compile this driver as a module, choose M here: the
109	  module will be called powernow-k8.
110
111	  For details, take a look at <file:Documentation/cpu-freq/>.
112
113config X86_GX_SUSPMOD
114	tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
115	depends on X86_32 && PCI
116	help
117	 This add the CPUFreq driver for NatSemi Geode processors which
118	 support suspend modulation.
119
120	 For details, take a look at <file:Documentation/cpu-freq/>.
121
122	 If in doubt, say N.
123
124config X86_SPEEDSTEP_CENTRINO
125	tristate "Intel Enhanced SpeedStep (deprecated)"
126	select CPU_FREQ_TABLE
127	select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
128	depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
129	help
130	  This is deprecated and this functionality is now merged into
131	  acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
132	  speedstep_centrino.
133	  This adds the CPUFreq driver for Enhanced SpeedStep enabled
134	  mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
135	  or 64bit enabled Intel Xeons.
136
137	  To compile this driver as a module, choose M here: the
138	  module will be called speedstep-centrino.
139
140	  For details, take a look at <file:Documentation/cpu-freq/>.
141
142	  If in doubt, say N.
143
144config X86_SPEEDSTEP_CENTRINO_TABLE
145	bool "Built-in tables for Banias CPUs"
146	depends on X86_32 && X86_SPEEDSTEP_CENTRINO
147	default y
148	help
149	  Use built-in tables for Banias CPUs if ACPI encoding
150	  is not available.
151
152	  If in doubt, say N.
153
154config X86_SPEEDSTEP_ICH
155	tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
156	select CPU_FREQ_TABLE
157	depends on X86_32
158	help
159	  This adds the CPUFreq driver for certain mobile Intel Pentium III
160	  (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
161	  mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
162	  ICH3 or ICH4 southbridge.
163
164	  For details, take a look at <file:Documentation/cpu-freq/>.
165
166	  If in doubt, say N.
167
168config X86_SPEEDSTEP_SMI
169	tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
170	select CPU_FREQ_TABLE
171	depends on X86_32 && EXPERIMENTAL
172	help
173	  This adds the CPUFreq driver for certain mobile Intel Pentium III
174	  (Coppermine), all mobile Intel Pentium III-M (Tualatin)
175	  on systems which have an Intel 440BX/ZX/MX southbridge.
176
177	  For details, take a look at <file:Documentation/cpu-freq/>.
178
179	  If in doubt, say N.
180
181config X86_P4_CLOCKMOD
182	tristate "Intel Pentium 4 clock modulation"
183	select CPU_FREQ_TABLE
184	help
185	  This adds the CPUFreq driver for Intel Pentium 4 / XEON
186	  processors.  When enabled it will lower CPU temperature by skipping
187	  clocks.
188
189	  This driver should be only used in exceptional
190	  circumstances when very low power is needed because it causes severe
191	  slowdowns and noticeable latencies.  Normally Speedstep should be used
192	  instead.
193
194	  To compile this driver as a module, choose M here: the
195	  module will be called p4-clockmod.
196
197	  For details, take a look at <file:Documentation/cpu-freq/>.
198
199	  Unless you are absolutely sure say N.
200
201config X86_CPUFREQ_NFORCE2
202	tristate "nVidia nForce2 FSB changing"
203	depends on X86_32 && EXPERIMENTAL
204	help
205	  This adds the CPUFreq driver for FSB changing on nVidia nForce2
206	  platforms.
207
208	  For details, take a look at <file:Documentation/cpu-freq/>.
209
210	  If in doubt, say N.
211
212config X86_LONGRUN
213	tristate "Transmeta LongRun"
214	depends on X86_32
215	help
216	  This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
217	  which support LongRun.
218
219	  For details, take a look at <file:Documentation/cpu-freq/>.
220
221	  If in doubt, say N.
222
223config X86_LONGHAUL
224	tristate "VIA Cyrix III Longhaul"
225	select CPU_FREQ_TABLE
226	depends on X86_32 && ACPI_PROCESSOR
227	help
228	  This adds the CPUFreq driver for VIA Samuel/CyrixIII,
229	  VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
230	  processors.
231
232	  For details, take a look at <file:Documentation/cpu-freq/>.
233
234	  If in doubt, say N.
235
236config X86_E_POWERSAVER
237	tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)"
238	select CPU_FREQ_TABLE
239	depends on X86_32 && EXPERIMENTAL
240	help
241	  This adds the CPUFreq driver for VIA C7 processors.  However, this driver
242	  does not have any safeguards to prevent operating the CPU out of spec
243	  and is thus considered dangerous.  Please use the regular ACPI cpufreq
244	  driver, enabled by CONFIG_X86_ACPI_CPUFREQ.
245
246	  If in doubt, say N.
247
248comment "shared options"
249
250config X86_SPEEDSTEP_LIB
251	tristate
252	default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
253
254config X86_SPEEDSTEP_RELAXED_CAP_CHECK
255	bool "Relaxed speedstep capability checks"
256	depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
257	help
258	  Don't perform all checks for a speedstep capable system which would
259	  normally be done. Some ancient or strange systems, though speedstep
260	  capable, don't always indicate that they are speedstep capable. This
261	  option lets the probing code bypass some of those checks if the
262	  parameter "relaxed_check=1" is passed to the module.
263
264endif	# CPU_FREQ
265
266endmenu
267