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.
  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
  35 config 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
  51 config 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
  63 config 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
  75 config 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
  86 config 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
  93 config 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
 105 config 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
 116 config 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
 136 config 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
 146 config 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
 160 config 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
 173 config 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
 193 config 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
 204 config 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
 215 config 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
 228 config 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
 240 comment "shared options"
 241
 242 config X86_SPEEDSTEP_LIB
 243         tristate
 244         default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
 245
 246 config 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