linux/drivers/cpufreq/Kconfig.x86
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   1#
   2# x86 CPU Frequency scaling drivers
   3#
   4
   5config 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
  19config 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.
  27
  28          To compile this driver as a module, choose M here: the
  29          module will be called acpi-cpufreq.
  30
  31          For details, take a look at <file:Documentation/cpu-freq/>.
  32
  33          If in doubt, say N.
  34
  35config ELAN_CPUFREQ
  36        tristate "AMD Elan SC400 and SC410"
  37        select CPU_FREQ_TABLE
  38        depends on MELAN
  39        ---help---
  40          This adds the CPUFreq driver for AMD Elan SC400 and SC410
  41          processors.
  42
  43          You need to specify the processor maximum speed as boot
  44          parameter: elanfreq=maxspeed (in kHz) or as module
  45          parameter "max_freq".
  46
  47          For details, take a look at <file:Documentation/cpu-freq/>.
  48
  49          If in doubt, say N.
  50
  51config SC520_CPUFREQ
  52        tristate "AMD Elan SC520"
  53        select CPU_FREQ_TABLE
  54        depends on MELAN
  55        ---help---
  56          This adds the CPUFreq driver for AMD Elan SC520 processor.
  57
  58          For details, take a look at <file:Documentation/cpu-freq/>.
  59
  60          If in doubt, say N.
  61
  62
  63config X86_POWERNOW_K6
  64        tristate "AMD Mobile K6-2/K6-3 PowerNow!"
  65        select CPU_FREQ_TABLE
  66        depends on X86_32
  67        help
  68          This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
  69          AMD K6-3+ processors.
  70
  71          For details, take a look at <file:Documentation/cpu-freq/>.
  72
  73          If in doubt, say N.
  74
  75config X86_POWERNOW_K7
  76        tristate "AMD Mobile Athlon/Duron PowerNow!"
  77        select CPU_FREQ_TABLE
  78        depends on X86_32
  79        help
  80          This adds the CPUFreq driver for mobile AMD K7 mobile processors.
  81
  82          For details, take a look at <file:Documentation/cpu-freq/>.
  83
  84          If in doubt, say N.
  85
  86config X86_POWERNOW_K7_ACPI
  87        bool
  88        depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
  89        depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
  90        depends on X86_32
  91        default y
  92
  93config X86_POWERNOW_K8
  94        tristate "AMD Opteron/Athlon64 PowerNow!"
  95        select CPU_FREQ_TABLE
  96        depends on ACPI && ACPI_PROCESSOR
  97        help
  98          This adds the CPUFreq driver for K8/K10 Opteron/Athlon64 processors.
  99
 100          To compile this driver as a module, choose M here: the
 101          module will be called powernow-k8.
 102
 103          For details, take a look at <file:Documentation/cpu-freq/>.
 104
 105config X86_GX_SUSPMOD
 106        tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
 107        depends on X86_32 && PCI
 108        help
 109         This add the CPUFreq driver for NatSemi Geode processors which
 110         support suspend modulation.
 111
 112         For details, take a look at <file:Documentation/cpu-freq/>.
 113
 114         If in doubt, say N.
 115
 116config X86_SPEEDSTEP_CENTRINO
 117        tristate "Intel Enhanced SpeedStep (deprecated)"
 118        select CPU_FREQ_TABLE
 119        select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
 120        depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
 121        help
 122          This is deprecated and this functionality is now merged into
 123          acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
 124          speedstep_centrino.
 125          This adds the CPUFreq driver for Enhanced SpeedStep enabled
 126          mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
 127          or 64bit enabled Intel Xeons.
 128
 129          To compile this driver as a module, choose M here: the
 130          module will be called speedstep-centrino.
 131
 132          For details, take a look at <file:Documentation/cpu-freq/>.
 133
 134          If in doubt, say N.
 135
 136config X86_SPEEDSTEP_CENTRINO_TABLE
 137        bool "Built-in tables for Banias CPUs"
 138        depends on X86_32 && X86_SPEEDSTEP_CENTRINO
 139        default y
 140        help
 141          Use built-in tables for Banias CPUs if ACPI encoding
 142          is not available.
 143
 144          If in doubt, say N.
 145
 146config X86_SPEEDSTEP_ICH
 147        tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
 148        select CPU_FREQ_TABLE
 149        depends on X86_32
 150        help
 151          This adds the CPUFreq driver for certain mobile Intel Pentium III
 152          (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
 153          mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
 154          ICH3 or ICH4 southbridge.
 155
 156          For details, take a look at <file:Documentation/cpu-freq/>.
 157
 158          If in doubt, say N.
 159
 160config X86_SPEEDSTEP_SMI
 161        tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
 162        select CPU_FREQ_TABLE
 163        depends on X86_32 && EXPERIMENTAL
 164        help
 165          This adds the CPUFreq driver for certain mobile Intel Pentium III
 166          (Coppermine), all mobile Intel Pentium III-M (Tualatin)
 167          on systems which have an Intel 440BX/ZX/MX southbridge.
 168
 169          For details, take a look at <file:Documentation/cpu-freq/>.
 170
 171          If in doubt, say N.
 172
 173config X86_P4_CLOCKMOD
 174        tristate "Intel Pentium 4 clock modulation"
 175        select CPU_FREQ_TABLE
 176        help
 177          This adds the CPUFreq driver for Intel Pentium 4 / XEON
 178          processors.  When enabled it will lower CPU temperature by skipping
 179          clocks.
 180
 181          This driver should be only used in exceptional
 182          circumstances when very low power is needed because it causes severe
 183          slowdowns and noticeable latencies.  Normally Speedstep should be used
 184          instead.
 185
 186          To compile this driver as a module, choose M here: the
 187          module will be called p4-clockmod.
 188
 189          For details, take a look at <file:Documentation/cpu-freq/>.
 190
 191          Unless you are absolutely sure say N.
 192
 193config X86_CPUFREQ_NFORCE2
 194        tristate "nVidia nForce2 FSB changing"
 195        depends on X86_32 && EXPERIMENTAL
 196        help
 197          This adds the CPUFreq driver for FSB changing on nVidia nForce2
 198          platforms.
 199
 200          For details, take a look at <file:Documentation/cpu-freq/>.
 201
 202          If in doubt, say N.
 203
 204config X86_LONGRUN
 205        tristate "Transmeta LongRun"
 206        depends on X86_32
 207        help
 208          This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
 209          which support LongRun.
 210
 211          For details, take a look at <file:Documentation/cpu-freq/>.
 212
 213          If in doubt, say N.
 214
 215config X86_LONGHAUL
 216        tristate "VIA Cyrix III Longhaul"
 217        select CPU_FREQ_TABLE
 218        depends on X86_32 && ACPI_PROCESSOR
 219        help
 220          This adds the CPUFreq driver for VIA Samuel/CyrixIII,
 221          VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
 222          processors.
 223
 224          For details, take a look at <file:Documentation/cpu-freq/>.
 225
 226          If in doubt, say N.
 227
 228config X86_E_POWERSAVER
 229        tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)"
 230        select CPU_FREQ_TABLE
 231        depends on X86_32 && EXPERIMENTAL
 232        help
 233          This adds the CPUFreq driver for VIA C7 processors.  However, this driver
 234          does not have any safeguards to prevent operating the CPU out of spec
 235          and is thus considered dangerous.  Please use the regular ACPI cpufreq
 236          driver, enabled by CONFIG_X86_ACPI_CPUFREQ.
 237
 238          If in doubt, say N.
 239
 240comment "shared options"
 241
 242config X86_SPEEDSTEP_LIB
 243        tristate
 244        default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
 245
 246config X86_SPEEDSTEP_RELAXED_CAP_CHECK
 247        bool "Relaxed speedstep capability checks"
 248        depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
 249        help
 250          Don't perform all checks for a speedstep capable system which would
 251          normally be done. Some ancient or strange systems, though speedstep
 252          capable, don't always indicate that they are speedstep capable. This
 253          option lets the probing code bypass some of those checks if the
 254          parameter "relaxed_check=1" is passed to the module.
 255
 256
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