drivers/cpufreq/Kconfig.x86

   1 #
   2 # x86 CPU Frequency scaling drivers
   3 #
   4
   5 config X86_PCC_CPUFREQ
   6         tristate "Processor Clocking Control interface driver"
   7         depends on ACPI && ACPI_PROCESSOR
   8         help
   9           This driver adds support for the PCC interface.
  10
  11           For details, take a look at:
  12           <file:Documentation/cpu-freq/pcc-cpufreq.txt>.
  13
  14           To compile this driver as a module, choose M here: the
  15           module will be called pcc-cpufreq.
  16
  17           If in doubt, say N.
  18
  19 config X86_ACPI_CPUFREQ
  20         tristate "ACPI Processor P-States driver"
  21         select CPU_FREQ_TABLE
  22         depends on ACPI_PROCESSOR
  23         help
  24           This driver adds a CPUFreq driver which utilizes the ACPI
  25           Processor Performance States.
  26           This driver also supports Intel Enhanced Speedstep and newer
  27           AMD CPUs.
  28
  29           To compile this driver as a module, choose M here: the
  30           module will be called acpi-cpufreq.
  31
  32           For details, take a look at <file:Documentation/cpu-freq/>.
  33
  34           If in doubt, say N.
  35
  36 config X86_ACPI_CPUFREQ_CPB
  37         default y
  38         bool "Legacy cpb sysfs knob support for AMD CPUs"
  39         depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD
  40         help
  41           The powernow-k8 driver used to provide a sysfs knob called "cpb"
  42           to disable the Core Performance Boosting feature of AMD CPUs. This
  43           file has now been superseeded by the more generic "boost" entry.
  44
  45           By enabling this option the acpi_cpufreq driver provides the old
  46           entry in addition to the new boost ones, for compatibility reasons.
  47
  48 config ELAN_CPUFREQ
  49         tristate "AMD Elan SC400 and SC410"
  50         select CPU_FREQ_TABLE
  51         depends on MELAN
  52         ---help---
  53           This adds the CPUFreq driver for AMD Elan SC400 and SC410
  54           processors.
  55
  56           You need to specify the processor maximum speed as boot
  57           parameter: elanfreq=maxspeed (in kHz) or as module
  58           parameter "max_freq".
  59
  60           For details, take a look at <file:Documentation/cpu-freq/>.
  61
  62           If in doubt, say N.
  63
  64 config SC520_CPUFREQ
  65         tristate "AMD Elan SC520"
  66         select CPU_FREQ_TABLE
  67         depends on MELAN
  68         ---help---
  69           This adds the CPUFreq driver for AMD Elan SC520 processor.
  70
  71           For details, take a look at <file:Documentation/cpu-freq/>.
  72
  73           If in doubt, say N.
  74
  75
  76 config X86_POWERNOW_K6
  77         tristate "AMD Mobile K6-2/K6-3 PowerNow!"
  78         select CPU_FREQ_TABLE
  79         depends on X86_32
  80         help
  81           This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
  82           AMD K6-3+ processors.
  83
  84           For details, take a look at <file:Documentation/cpu-freq/>.
  85
  86           If in doubt, say N.
  87
  88 config X86_POWERNOW_K7
  89         tristate "AMD Mobile Athlon/Duron PowerNow!"
  90         select CPU_FREQ_TABLE
  91         depends on X86_32
  92         help
  93           This adds the CPUFreq driver for mobile AMD K7 mobile processors.
  94
  95           For details, take a look at <file:Documentation/cpu-freq/>.
  96
  97           If in doubt, say N.
  98
  99 config X86_POWERNOW_K7_ACPI
 100         bool
 101         depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
 102         depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
 103         depends on X86_32
 104         default y
 105
 106 config X86_POWERNOW_K8
 107         tristate "AMD Opteron/Athlon64 PowerNow!"
 108         select CPU_FREQ_TABLE
 109         depends on ACPI && ACPI_PROCESSOR
 110         help
 111           This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
 112           Support for K10 and newer processors is now in acpi-cpufreq.
 113
 114           To compile this driver as a module, choose M here: the
 115           module will be called powernow-k8.
 116
 117           For details, take a look at <file:Documentation/cpu-freq/>.
 118
 119 config X86_GX_SUSPMOD
 120         tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
 121         depends on X86_32 && PCI
 122         help
 123          This add the CPUFreq driver for NatSemi Geode processors which
 124          support suspend modulation.
 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
 131         tristate "Intel Enhanced SpeedStep (deprecated)"
 132         select CPU_FREQ_TABLE
 133         select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
 134         depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
 135         help
 136           This is deprecated and this functionality is now merged into
 137           acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
 138           speedstep_centrino.
 139           This adds the CPUFreq driver for Enhanced SpeedStep enabled
 140           mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
 141           or 64bit enabled Intel Xeons.
 142
 143           To compile this driver as a module, choose M here: the
 144           module will be called speedstep-centrino.
 145
 146           For details, take a look at <file:Documentation/cpu-freq/>.
 147
 148           If in doubt, say N.
 149
 150 config X86_SPEEDSTEP_CENTRINO_TABLE
 151         bool "Built-in tables for Banias CPUs"
 152         depends on X86_32 && X86_SPEEDSTEP_CENTRINO
 153         default y
 154         help
 155           Use built-in tables for Banias CPUs if ACPI encoding
 156           is not available.
 157
 158           If in doubt, say N.
 159
 160 config X86_SPEEDSTEP_ICH
 161         tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
 162         select CPU_FREQ_TABLE
 163         depends on X86_32
 164         help
 165           This adds the CPUFreq driver for certain mobile Intel Pentium III
 166           (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
 167           mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
 168           ICH3 or ICH4 southbridge.
 169
 170           For details, take a look at <file:Documentation/cpu-freq/>.
 171
 172           If in doubt, say N.
 173
 174 config X86_SPEEDSTEP_SMI
 175         tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
 176         select CPU_FREQ_TABLE
 177         depends on X86_32 && EXPERIMENTAL
 178         help
 179           This adds the CPUFreq driver for certain mobile Intel Pentium III
 180           (Coppermine), all mobile Intel Pentium III-M (Tualatin)
 181           on systems which have an Intel 440BX/ZX/MX southbridge.
 182
 183           For details, take a look at <file:Documentation/cpu-freq/>.
 184
 185           If in doubt, say N.
 186
 187 config X86_P4_CLOCKMOD
 188         tristate "Intel Pentium 4 clock modulation"
 189         select CPU_FREQ_TABLE
 190         help
 191           This adds the CPUFreq driver for Intel Pentium 4 / XEON
 192           processors.  When enabled it will lower CPU temperature by skipping
 193           clocks.
 194
 195           This driver should be only used in exceptional
 196           circumstances when very low power is needed because it causes severe
 197           slowdowns and noticeable latencies.  Normally Speedstep should be used
 198           instead.
 199
 200           To compile this driver as a module, choose M here: the
 201           module will be called p4-clockmod.
 202
 203           For details, take a look at <file:Documentation/cpu-freq/>.
 204
 205           Unless you are absolutely sure say N.
 206
 207 config X86_CPUFREQ_NFORCE2
 208         tristate "nVidia nForce2 FSB changing"
 209         depends on X86_32 && EXPERIMENTAL
 210         help
 211           This adds the CPUFreq driver for FSB changing on nVidia nForce2
 212           platforms.
 213
 214           For details, take a look at <file:Documentation/cpu-freq/>.
 215
 216           If in doubt, say N.
 217
 218 config X86_LONGRUN
 219         tristate "Transmeta LongRun"
 220         depends on X86_32
 221         help
 222           This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
 223           which support LongRun.
 224
 225           For details, take a look at <file:Documentation/cpu-freq/>.
 226
 227           If in doubt, say N.
 228
 229 config X86_LONGHAUL
 230         tristate "VIA Cyrix III Longhaul"
 231         select CPU_FREQ_TABLE
 232         depends on X86_32 && ACPI_PROCESSOR
 233         help
 234           This adds the CPUFreq driver for VIA Samuel/CyrixIII,
 235           VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
 236           processors.
 237
 238           For details, take a look at <file:Documentation/cpu-freq/>.
 239
 240           If in doubt, say N.
 241
 242 config X86_E_POWERSAVER
 243         tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)"
 244         select CPU_FREQ_TABLE
 245         depends on X86_32 && EXPERIMENTAL
 246         help
 247           This adds the CPUFreq driver for VIA C7 processors.  However, this driver
 248           does not have any safeguards to prevent operating the CPU out of spec
 249           and is thus considered dangerous.  Please use the regular ACPI cpufreq
 250           driver, enabled by CONFIG_X86_ACPI_CPUFREQ.
 251
 252           If in doubt, say N.
 253
 254 comment "shared options"
 255
 256 config X86_SPEEDSTEP_LIB
 257         tristate
 258         default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
 259
 260 config X86_SPEEDSTEP_RELAXED_CAP_CHECK
 261         bool "Relaxed speedstep capability checks"
 262         depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
 263         help
 264           Don't perform all checks for a speedstep capable system which would
 265           normally be done. Some ancient or strange systems, though speedstep
 266           capable, don't always indicate that they are speedstep capable. This
 267           option lets the probing code bypass some of those checks if the
 268           parameter "relaxed_check=1" is passed to the module.
 269