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         help
  91           This adds the CPUFreq driver for mobile AMD Opteron/Athlon64 processors.
  92
  93           To compile this driver as a module, choose M here: the
  94           module will be called powernow-k8.
  95
  96           For details, take a look at <file:Documentation/cpu-freq/>.
  97
  98           If in doubt, say N.
  99
 100 config X86_POWERNOW_K8_ACPI
 101         bool
 102         prompt "ACPI Support" if X86_32
 103         depends on ACPI && X86_POWERNOW_K8 && ACPI_PROCESSOR
 104         depends on !(X86_POWERNOW_K8 = y && ACPI_PROCESSOR = m)
 105         default y
 106         help
 107           This provides access to the K8s Processor Performance States via ACPI.
 108           This driver is probably required for CPUFreq to work with multi-socket and
 109           SMP systems.  It is not required on at least some single-socket yet
 110           multi-core systems, even if SMP is enabled.
 111
 112           It is safe to say Y here.
 113
 114 config X86_GX_SUSPMOD
 115         tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
 116         depends on X86_32 && PCI
 117         help
 118          This add the CPUFreq driver for NatSemi Geode processors which
 119          support suspend modulation.
 120
 121          For details, take a look at <file:Documentation/cpu-freq/>.
 122
 123          If in doubt, say N.
 124
 125 config X86_SPEEDSTEP_CENTRINO
 126         tristate "Intel Enhanced SpeedStep (deprecated)"
 127         select CPU_FREQ_TABLE
 128         select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
 129         depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
 130         help
 131           This is deprecated and this functionality is now merged into
 132           acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
 133           speedstep_centrino.
 134           This adds the CPUFreq driver for Enhanced SpeedStep enabled
 135           mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
 136           or 64bit enabled Intel Xeons.
 137
 138           To compile this driver as a module, choose M here: the
 139           module will be called speedstep-centrino.
 140
 141           For details, take a look at <file:Documentation/cpu-freq/>.
 142
 143           If in doubt, say N.
 144
 145 config X86_SPEEDSTEP_CENTRINO_TABLE
 146         bool "Built-in tables for Banias CPUs"
 147         depends on X86_32 && X86_SPEEDSTEP_CENTRINO
 148         default y
 149         help
 150           Use built-in tables for Banias CPUs if ACPI encoding
 151           is not available.
 152
 153           If in doubt, say N.
 154
 155 config X86_SPEEDSTEP_ICH
 156         tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
 157         select CPU_FREQ_TABLE
 158         depends on X86_32
 159         help
 160           This adds the CPUFreq driver for certain mobile Intel Pentium III
 161           (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
 162           mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
 163           ICH3 or ICH4 southbridge.
 164
 165           For details, take a look at <file:Documentation/cpu-freq/>.
 166
 167           If in doubt, say N.
 168
 169 config X86_SPEEDSTEP_SMI
 170         tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
 171         select CPU_FREQ_TABLE
 172         depends on X86_32 && EXPERIMENTAL
 173         help
 174           This adds the CPUFreq driver for certain mobile Intel Pentium III
 175           (Coppermine), all mobile Intel Pentium III-M (Tualatin)
 176           on systems which have an Intel 440BX/ZX/MX southbridge.
 177
 178           For details, take a look at <file:Documentation/cpu-freq/>.
 179
 180           If in doubt, say N.
 181
 182 config X86_P4_CLOCKMOD
 183         tristate "Intel Pentium 4 clock modulation"
 184         select CPU_FREQ_TABLE
 185         help
 186           This adds the CPUFreq driver for Intel Pentium 4 / XEON
 187           processors.  When enabled it will lower CPU temperature by skipping
 188           clocks.
 189
 190           This driver should be only used in exceptional
 191           circumstances when very low power is needed because it causes severe
 192           slowdowns and noticeable latencies.  Normally Speedstep should be used
 193           instead.
 194
 195           To compile this driver as a module, choose M here: the
 196           module will be called p4-clockmod.
 197
 198           For details, take a look at <file:Documentation/cpu-freq/>.
 199
 200           Unless you are absolutely sure say N.
 201
 202 config X86_CPUFREQ_NFORCE2
 203         tristate "nVidia nForce2 FSB changing"
 204         depends on X86_32 && EXPERIMENTAL
 205         help
 206           This adds the CPUFreq driver for FSB changing on nVidia nForce2
 207           platforms.
 208
 209           For details, take a look at <file:Documentation/cpu-freq/>.
 210
 211           If in doubt, say N.
 212
 213 config X86_LONGRUN
 214         tristate "Transmeta LongRun"
 215         depends on X86_32
 216         help
 217           This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
 218           which support LongRun.
 219
 220           For details, take a look at <file:Documentation/cpu-freq/>.
 221
 222           If in doubt, say N.
 223
 224 config X86_LONGHAUL
 225         tristate "VIA Cyrix III Longhaul"
 226         select CPU_FREQ_TABLE
 227         depends on X86_32 && ACPI_PROCESSOR
 228         help
 229           This adds the CPUFreq driver for VIA Samuel/CyrixIII,
 230           VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
 231           processors.
 232
 233           For details, take a look at <file:Documentation/cpu-freq/>.
 234
 235           If in doubt, say N.
 236
 237 config X86_E_POWERSAVER
 238         tristate "VIA C7 Enhanced PowerSaver"
 239         select CPU_FREQ_TABLE
 240         depends on X86_32
 241         help
 242           This adds the CPUFreq driver for VIA C7 processors.
 243
 244           If in doubt, say N.
 245
 246 comment "shared options"
 247
 248 config X86_ACPI_CPUFREQ_PROC_INTF
 249         bool "/proc/acpi/processor/../performance interface (deprecated)"
 250         depends on PROC_FS
 251         depends on X86_ACPI_CPUFREQ || X86_POWERNOW_K7_ACPI || X86_POWERNOW_K8_ACPI
 252         help
 253           This enables the deprecated /proc/acpi/processor/../performance
 254           interface. While it is helpful for debugging, the generic,
 255           cross-architecture cpufreq interfaces should be used.
 256
 257           If in doubt, say N.
 258
 259 config X86_SPEEDSTEP_LIB
 260         tristate
 261         default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
 262
 263 config X86_SPEEDSTEP_RELAXED_CAP_CHECK
 264         bool "Relaxed speedstep capability checks"
 265         depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
 266         help
 267           Don't perform all checks for a speedstep capable system which would
 268           normally be done. Some ancient or strange systems, though speedstep
 269           capable, don't always indicate that they are speedstep capable. This
 270           option lets the probing code bypass some of those checks if the
 271           parameter "relaxed_check=1" is passed to the module.
 272
 273 endif   # CPU_FREQ
 274
 275 endmenu