arch/x86/kernel/cpu/cpufreq/Kconfig

   1 #
   2 # CPU Frequency scaling
   3 #
   4
   5 menu "CPU Frequency scaling"
   6
   7 source "drivers/cpufreq/Kconfig"
   8
   9 if CPU_FREQ
  10
  11 comment "CPUFreq processor drivers"
  12
  13 config 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
  29 config 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
  45 config 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
  57 config 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
  69 config 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
  80 config 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
  87 config X86_POWERNOW_K8
  88         tristate "AMD Opteron/Athlon64 PowerNow!"
  89         select CPU_FREQ_TABLE
  90         depends on ACPI && ACPI_PROCESSOR
  91         help
  92           This adds the CPUFreq driver for K8/K10 Opteron/Athlon64 processors.
  93
  94           To compile this driver as a module, choose M here: the
  95           module will be called powernow-k8.
  96
  97           For details, take a look at <file:Documentation/cpu-freq/>.
  98
  99 config X86_GX_SUSPMOD
 100         tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
 101         depends on X86_32 && PCI
 102         help
 103          This add the CPUFreq driver for NatSemi Geode processors which
 104          support suspend modulation.
 105
 106          For details, take a look at <file:Documentation/cpu-freq/>.
 107
 108          If in doubt, say N.
 109
 110 config X86_SPEEDSTEP_CENTRINO
 111         tristate "Intel Enhanced SpeedStep (deprecated)"
 112         select CPU_FREQ_TABLE
 113         select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
 114         depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
 115         help
 116           This is deprecated and this functionality is now merged into
 117           acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
 118           speedstep_centrino.
 119           This adds the CPUFreq driver for Enhanced SpeedStep enabled
 120           mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
 121           or 64bit enabled Intel Xeons.
 122
 123           To compile this driver as a module, choose M here: the
 124           module will be called speedstep-centrino.
 125
 126           For details, take a look at <file:Documentation/cpu-freq/>.
 127
 128           If in doubt, say N.
 129
 130 config X86_SPEEDSTEP_CENTRINO_TABLE
 131         bool "Built-in tables for Banias CPUs"
 132         depends on X86_32 && X86_SPEEDSTEP_CENTRINO
 133         default y
 134         help
 135           Use built-in tables for Banias CPUs if ACPI encoding
 136           is not available.
 137
 138           If in doubt, say N.
 139
 140 config X86_SPEEDSTEP_ICH
 141         tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
 142         select CPU_FREQ_TABLE
 143         depends on X86_32
 144         help
 145           This adds the CPUFreq driver for certain mobile Intel Pentium III
 146           (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
 147           mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
 148           ICH3 or ICH4 southbridge.
 149
 150           For details, take a look at <file:Documentation/cpu-freq/>.
 151
 152           If in doubt, say N.
 153
 154 config X86_SPEEDSTEP_SMI
 155         tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
 156         select CPU_FREQ_TABLE
 157         depends on X86_32 && EXPERIMENTAL
 158         help
 159           This adds the CPUFreq driver for certain mobile Intel Pentium III
 160           (Coppermine), all mobile Intel Pentium III-M (Tualatin)
 161           on systems which have an Intel 440BX/ZX/MX southbridge.
 162
 163           For details, take a look at <file:Documentation/cpu-freq/>.
 164
 165           If in doubt, say N.
 166
 167 config X86_P4_CLOCKMOD
 168         tristate "Intel Pentium 4 clock modulation"
 169         select CPU_FREQ_TABLE
 170         help
 171           This adds the CPUFreq driver for Intel Pentium 4 / XEON
 172           processors.  When enabled it will lower CPU temperature by skipping
 173           clocks.
 174
 175           This driver should be only used in exceptional
 176           circumstances when very low power is needed because it causes severe
 177           slowdowns and noticeable latencies.  Normally Speedstep should be used
 178           instead.
 179
 180           To compile this driver as a module, choose M here: the
 181           module will be called p4-clockmod.
 182
 183           For details, take a look at <file:Documentation/cpu-freq/>.
 184
 185           Unless you are absolutely sure say N.
 186
 187 config X86_CPUFREQ_NFORCE2
 188         tristate "nVidia nForce2 FSB changing"
 189         depends on X86_32 && EXPERIMENTAL
 190         help
 191           This adds the CPUFreq driver for FSB changing on nVidia nForce2
 192           platforms.
 193
 194           For details, take a look at <file:Documentation/cpu-freq/>.
 195
 196           If in doubt, say N.
 197
 198 config X86_LONGRUN
 199         tristate "Transmeta LongRun"
 200         depends on X86_32
 201         help
 202           This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
 203           which support LongRun.
 204
 205           For details, take a look at <file:Documentation/cpu-freq/>.
 206
 207           If in doubt, say N.
 208
 209 config X86_LONGHAUL
 210         tristate "VIA Cyrix III Longhaul"
 211         select CPU_FREQ_TABLE
 212         depends on X86_32 && ACPI_PROCESSOR
 213         help
 214           This adds the CPUFreq driver for VIA Samuel/CyrixIII,
 215           VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
 216           processors.
 217
 218           For details, take a look at <file:Documentation/cpu-freq/>.
 219
 220           If in doubt, say N.
 221
 222 config X86_E_POWERSAVER
 223         tristate "VIA C7 Enhanced PowerSaver"
 224         select CPU_FREQ_TABLE
 225         depends on X86_32
 226         help
 227           This adds the CPUFreq driver for VIA C7 processors.
 228
 229           If in doubt, say N.
 230
 231 comment "shared options"
 232
 233 config X86_SPEEDSTEP_LIB
 234         tristate
 235         default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
 236
 237 config X86_SPEEDSTEP_RELAXED_CAP_CHECK
 238         bool "Relaxed speedstep capability checks"
 239         depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
 240         help
 241           Don't perform all checks for a speedstep capable system which would
 242           normally be done. Some ancient or strange systems, though speedstep
 243           capable, don't always indicate that they are speedstep capable. This
 244           option lets the probing code bypass some of those checks if the
 245           parameter "relaxed_check=1" is passed to the module.
 246
 247 endif   # CPU_FREQ
 248
 249 endmenu