Commit da16456f authored by Dave Jones's avatar Dave Jones

Merge tetrachloride.(none):/mnt/raid/src/kernel/2.5/bk-linus

into tetrachloride.(none):/mnt/raid/src/kernel/2.5/cpufreq
parents d6266c68 ae981631
......@@ -53,9 +53,12 @@ The following processors for the x86 architecture are supported by cpufreq:
AMD Elan - SC400, SC410
AMD mobile K6-2+
AMD mobile K6-3+
AMD mobile Duron
AMD mobile Athlon
Cyrix Media GXm
Intel mobile PIII [*] and Intel mobile PIII-M on certain chipsets
Intel Pentium 4, Intel Xeon
Intel Pentium M (Centrino)
National Semiconductors Geode GX
Transmeta Crusoe
VIA Cyrix 3 / C3
......@@ -117,7 +120,7 @@ the processor shall run at.
The preferred interface is located in the sysfs filesystem. If you
mounted it at /sys, the cpufreq interface is located in a subdirectory
"cpufreq" within the cpu-device directory
(e.g. /sys/devices/sys/cpu0/cpufreq/ for the first CPU).
(e.g. /sys/class/cpu/cpu0/cpufreq/ for the first CPU).
cpuinfo_min_freq : this file shows the minimum operating
frequency the processor can run at(in kHz)
......
......@@ -11,7 +11,7 @@ config CPU_FREQ
fly. This is a nice method to save battery power on notebooks,
because the lower the clock speed, the less power the CPU consumes.
For more information, take a look at linux/Documentation/cpufreq or
For more information, take a look at linux/Documentation/cpu-freq or
at <http://www.brodo.de/cpufreq/>
If in doubt, say N.
......@@ -38,7 +38,7 @@ config X86_ACPI_CPUFREQ
This driver adds a CPUFreq driver which utilizes the ACPI
Processor Performance States.
For details, take a look at linux/Documentation/cpufreq.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
......@@ -63,7 +63,7 @@ config ELAN_CPUFREQ
parameter: elanfreq=maxspeed (in kHz) or as module
parameter "max_freq".
For details, take a look at linux/Documentation/cpufreq.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
......@@ -74,7 +74,7 @@ config X86_POWERNOW_K6
This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
AMD K6-3+ processors.
For details, take a look at linux/Documentation/cpufreq.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
......@@ -84,7 +84,7 @@ config X86_POWERNOW_K7
help
This adds the CPUFreq driver for mobile AMD K7 mobile processors.
For details, take a look at linux/Documentation/cpufreq.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
......@@ -95,19 +95,30 @@ config X86_GX_SUSPMOD
This add the CPUFreq driver for NatSemi Geode processors which
support suspend modulation.
For details, take a look at linux/Documentation/cpufreq.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
config X86_SPEEDSTEP
config X86_SPEEDSTEP_ICH
tristate "Intel Speedstep"
depends on CPU_FREQ_TABLE
help
This adds the CPUFreq driver for certain mobile Intel Pentium III
(Coppermine), all mobile Intel Pentium III-M (Tulatin) and all
(Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
mobile Intel Pentium 4 P4-Ms.
For details, take a look at linux/Documentation/cpufreq.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
config X86_SPEEDSTEP_CENTRINO
tristate "Intel Enhanced SpeedStep"
depends on CPU_FREQ_TABLE
help
This adds the CPUFreq driver for Enhanced SpeedStep enabled
mobile CPUs. This means Intel Pentium M (Centrino) CPUs.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
......@@ -118,7 +129,7 @@ config X86_P4_CLOCKMOD
This adds the CPUFreq driver for Intel Pentium 4 / XEON
processors.
For details, take a look at linux/Documentation/cpufreq.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
......@@ -129,7 +140,7 @@ config X86_LONGRUN
This adds the CPUFreq driver for Transmeta Crusoe processors which
support LongRun.
For details, take a look at linux/Documentation/cpufreq.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
......@@ -141,7 +152,7 @@ config X86_LONGHAUL
VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
processors.
For details, take a look at linux/Documentation/cpufreq.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
......
obj-$(CONFIG_X86_POWERNOW_K6) += powernow-k6.o
obj-$(CONFIG_X86_POWERNOW_K7) += powernow-k7.o
obj-$(CONFIG_X86_LONGHAUL) += longhaul.o
obj-$(CONFIG_X86_SPEEDSTEP) += speedstep.o
obj-$(CONFIG_X86_P4_CLOCKMOD) += p4-clockmod.o
obj-$(CONFIG_ELAN_CPUFREQ) += elanfreq.o
obj-$(CONFIG_X86_LONGRUN) += longrun.o
obj-$(CONFIG_X86_GX_SUSPMOD) += gx-suspmod.o
obj-$(CONFIG_X86_ACPI_CPUFREQ) += acpi.o
obj-$(CONFIG_X86_SPEEDSTEP_ICH) += speedstep-ich.o
obj-$(CONFIG_X86_SPEEDSTEP_CENTRINO) += speedstep-centrino.o
ifdef CONFIG_X86_ACPI_CPUFREQ
ifdef CONFIG_ACPI_DEBUG
......
......@@ -10,7 +10,6 @@
*
* Errata 5: Processor may fail to execute a FID/VID change in presence of interrupt.
* - We cli/sti on stepping A0 CPUs around the FID/VID transition.
* (ADDENDUM: This seems to be needed on more systems, so we do it unconditionally now).
* Errata 15: Processors with half frequency multipliers may hang upon wakeup from disconnect.
* - We disable half multipliers if ACPI is used on A0 stepping CPUs.
*/
......@@ -260,6 +259,7 @@ static void change_speed (unsigned int index)
/* Now do the magic poking into the MSRs. */
if (have_a0 == 1) /* A0 errata 5 */
__asm__("\tcli\n");
if (freqs.old > freqs.new) {
......@@ -272,6 +272,8 @@ static void change_speed (unsigned int index)
change_FID(vid);
}
if (have_a0 == 1)
__asm__("\tsti\n");
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
......
/*
* cpufreq driver for Enhanced SpeedStep, as found in Intel's Pentium
* M (part of the Centrino chipset).
*
* Despite the "SpeedStep" in the name, this is almost entirely unlike
* traditional SpeedStep.
*
* Modelled on speedstep.c
*
* Copyright (C) 2003 Jeremy Fitzhardinge <jeremy@goop.org>
*
* WARNING WARNING WARNING
*
* This driver manipulates the PERF_CTL MSR, which is only somewhat
* documented. While it seems to work on my laptop, it has not been
* tested anywhere else, and it may not work for you, do strange
* things or simply crash.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <asm/msr.h>
#include <asm/processor.h>
#include <asm/cpufeature.h>
#define PFX "speedstep-centrino: "
#define MAINTAINER "Jeremy Fitzhardinge <jeremy@goop.org>"
#define CENTRINO_DEBUG
#ifdef CENTRINO_DEBUG
#define dprintk(msg...) printk(msg)
#else
#define dprintk(msg...) do { } while(0)
#endif
struct cpu_model
{
const char *model_name;
unsigned max_freq; /* max clock in kHz */
struct cpufreq_frequency_table *op_points; /* clock/voltage pairs */
};
/* Operating points for current CPU */
static const struct cpu_model *centrino_model;
/* Computes the correct form for IA32_PERF_CTL MSR for a particular
frequency/voltage operating point; frequency in MHz, volts in mV.
This is stored as "index" in the structure. */
#define OP(mhz, mv) \
{ \
.frequency = (mhz) * 1000, \
.index = (((mhz)/100) << 8) | ((mv - 700) / 16) \
}
/*
* These voltage tables were derived from the Intel Pentium M
* datasheet, document 25261202.pdf, Table 5. I have verified they
* are consistent with my IBM ThinkPad X31, which has a 1.3GHz Pentium
* M.
*/
/* Ultra Low Voltage Intel Pentium M processor 900MHz */
static struct cpufreq_frequency_table op_900[] =
{
OP(600, 844),
OP(800, 988),
OP(900, 1004),
{ .frequency = CPUFREQ_TABLE_END }
};
/* Low Voltage Intel Pentium M processor 1.10GHz */
static struct cpufreq_frequency_table op_1100[] =
{
OP( 600, 956),
OP( 800, 1020),
OP( 900, 1100),
OP(1000, 1164),
OP(1100, 1180),
{ .frequency = CPUFREQ_TABLE_END }
};
/* Low Voltage Intel Pentium M processor 1.20GHz */
static struct cpufreq_frequency_table op_1200[] =
{
OP( 600, 956),
OP( 800, 1004),
OP( 900, 1020),
OP(1000, 1100),
OP(1100, 1164),
OP(1200, 1180),
{ .frequency = CPUFREQ_TABLE_END }
};
/* Intel Pentium M processor 1.30GHz */
static struct cpufreq_frequency_table op_1300[] =
{
OP( 600, 956),
OP( 800, 1260),
OP(1000, 1292),
OP(1200, 1356),
OP(1300, 1388),
{ .frequency = CPUFREQ_TABLE_END }
};
/* Intel Pentium M processor 1.40GHz */
static struct cpufreq_frequency_table op_1400[] =
{
OP( 600, 956),
OP( 800, 1180),
OP(1000, 1308),
OP(1200, 1436),
OP(1400, 1484),
{ .frequency = CPUFREQ_TABLE_END }
};
/* Intel Pentium M processor 1.50GHz */
static struct cpufreq_frequency_table op_1500[] =
{
OP( 600, 956),
OP( 800, 1116),
OP(1000, 1228),
OP(1200, 1356),
OP(1400, 1452),
OP(1500, 1484),
{ .frequency = CPUFREQ_TABLE_END }
};
/* Intel Pentium M processor 1.60GHz */
static struct cpufreq_frequency_table op_1600[] =
{
OP( 600, 956),
OP( 800, 1036),
OP(1000, 1164),
OP(1200, 1276),
OP(1400, 1420),
OP(1600, 1484),
{ .frequency = CPUFREQ_TABLE_END }
};
/* Intel Pentium M processor 1.70GHz */
static struct cpufreq_frequency_table op_1700[] =
{
OP( 600, 956),
OP( 800, 1004),
OP(1000, 1116),
OP(1200, 1228),
OP(1400, 1308),
OP(1700, 1484),
{ .frequency = CPUFREQ_TABLE_END }
};
#undef OP
#define CPU(max) \
{ "Intel(R) Pentium(R) M processor " #max "MHz", (max)*1000, op_##max }
/* CPU models, their operating frequency range, and freq/voltage
operating points */
static const struct cpu_model models[] =
{
CPU( 900),
CPU(1100),
CPU(1200),
CPU(1300),
CPU(1400),
CPU(1500),
CPU(1600),
CPU(1700),
{ 0, }
};
#undef CPU
/* Extract clock in kHz from PERF_CTL value */
static unsigned extract_clock(unsigned msr)
{
msr = (msr >> 8) & 0xff;
return msr * 100000;
}
/* Return the current CPU frequency in kHz */
static unsigned get_cur_freq(void)
{
unsigned l, h;
rdmsr(MSR_IA32_PERF_STATUS, l, h);
return extract_clock(l);
}
static int centrino_cpu_init(struct cpufreq_policy *policy)
{
unsigned freq;
if (policy->cpu != 0 || centrino_model == NULL)
return -ENODEV;
freq = get_cur_freq();
policy->policy = (freq == centrino_model->max_freq) ?
CPUFREQ_POLICY_PERFORMANCE :
CPUFREQ_POLICY_POWERSAVE;
policy->cpuinfo.transition_latency = 10; /* 10uS transition latency */
policy->cur = freq;
dprintk(KERN_INFO PFX "centrino_cpu_init: policy=%d cur=%dkHz\n",
policy->policy, policy->cur);
return cpufreq_frequency_table_cpuinfo(policy, centrino_model->op_points);
}
/**
* centrino_verify - verifies a new CPUFreq policy
* @freq: new policy
*
* Limit must be within this model's frequency range at least one
* border included.
*/
static int centrino_verify (struct cpufreq_policy *policy)
{
return cpufreq_frequency_table_verify(policy, centrino_model->op_points);
}
/**
* centrino_setpolicy - set a new CPUFreq policy
* @policy: new policy
*
* Sets a new CPUFreq policy.
*/
static int centrino_target (struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
{
unsigned int newstate = 0;
unsigned int msr, oldmsr, h;
struct cpufreq_freqs freqs;
if (centrino_model == NULL)
return -ENODEV;
if (cpufreq_frequency_table_target(policy, centrino_model->op_points, target_freq,
relation, &newstate))
return -EINVAL;
msr = centrino_model->op_points[newstate].index;
rdmsr(MSR_IA32_PERF_CTL, oldmsr, h);
if (msr == (oldmsr & 0xffff))
return 0;
/* Hm, old frequency can either be the last value we put in
PERF_CTL, or whatever it is now. The trouble is that TM2
can change it behind our back, which means we never get to
see the speed change. Reading back the current speed would
tell us something happened, but it may leave the things on
the notifier chain confused; we therefore stick to using
the last programmed speed rather than the current speed for
"old".
TODO: work out how the TCC interrupts work, and try to
catch the CPU changing things under us.
*/
freqs.cpu = 0;
freqs.old = extract_clock(oldmsr);
freqs.new = extract_clock(msr);
dprintk(KERN_INFO PFX "target=%dkHz old=%d new=%d msr=%04x\n",
target_freq, freqs.old, freqs.new, msr);
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
/* all but 16 LSB are "reserved", so treat them with
care */
oldmsr &= ~0xffff;
msr &= 0xffff;
oldmsr |= msr;
wrmsr(MSR_IA32_PERF_CTL, oldmsr, h);
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
return 0;
}
static struct cpufreq_driver centrino_driver = {
.name = "centrino", /* should be speedstep-centrino,
but there's a 16 char limit */
.init = centrino_cpu_init,
.verify = centrino_verify,
.target = centrino_target,
.owner = THIS_MODULE,
};
/**
* centrino_init - initializes the Enhanced SpeedStep CPUFreq driver
*
* Initializes the Enhanced SpeedStep support. Returns -ENODEV on
* unsupported devices, -ENOENT if there's no voltage table for this
* particular CPU model, -EINVAL on problems during initiatization,
* and zero on success.
*
* This is quite picky. Not only does the CPU have to advertise the
* "est" flag in the cpuid capability flags, we look for a specific
* CPU model and stepping, and we need to have the exact model name in
* our voltage tables. That is, be paranoid about not releasing
* someone's valuable magic smoke.
*/
static int __init centrino_init(void)
{
struct cpuinfo_x86 *cpu = cpu_data;
const struct cpu_model *model;
unsigned l, h;
if (!cpu_has(cpu, X86_FEATURE_EST))
return -ENODEV;
/* Only Intel Pentium M stepping 5 for now - add new CPUs as
they appear after making sure they use PERF_CTL in the same
way. */
if (cpu->x86_vendor != X86_VENDOR_INTEL ||
cpu->x86 != 6 ||
cpu->x86_model != 9 ||
cpu->x86_mask != 5) {
printk(KERN_INFO PFX "found unsupported CPU with Enhanced SpeedStep: "
"send /proc/cpuinfo to " MAINTAINER "\n");
return -ENODEV;
}
/* Check to see if Enhanced SpeedStep is enabled, and try to
enable it if not. */
rdmsr(MSR_IA32_MISC_ENABLE, l, h);
if (!(l & (1<<16))) {
l |= (1<<16);
wrmsr(MSR_IA32_MISC_ENABLE, l, h);
/* check to see if it stuck */
rdmsr(MSR_IA32_MISC_ENABLE, l, h);
if (!(l & (1<<16))) {
printk(KERN_INFO PFX "couldn't enable Enhanced SpeedStep\n");
return -ENODEV;
}
}
for(model = models; model->model_name != NULL; model++)
if (strcmp(cpu->x86_model_id, model->model_name) == 0)
break;
if (model->model_name == NULL) {
printk(KERN_INFO PFX "no support for CPU model \"%s\": "
"send /proc/cpuinfo to " MAINTAINER "\n",
cpu->x86_model_id);
return -ENOENT;
}
centrino_model = model;
printk(KERN_INFO PFX "found \"%s\": max frequency: %dkHz\n",
model->model_name, model->max_freq);
return cpufreq_register_driver(&centrino_driver);
}
static void __exit centrino_exit(void)
{
cpufreq_unregister_driver(&centrino_driver);
}
MODULE_AUTHOR ("Jeremy Fitzhardinge <jeremy@goop.org>");
MODULE_DESCRIPTION ("Enhanced SpeedStep driver for Intel Pentium M processors.");
MODULE_LICENSE ("GPL");
module_init(centrino_init);
module_exit(centrino_exit);
......@@ -70,6 +70,7 @@
#define X86_FEATURE_P4 (3*32+ 7) /* P4 */
/* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
#define X86_FEATURE_EST (4*32+ 7) /* Enhanced SpeedStep */
/* VIA/Cyrix/Centaur-defined CPU features, CPUID level 0xC0000001, word 5 */
#define X86_FEATURE_XSTORE (5*32+ 2) /* on-CPU RNG present (xstore insn) */
......
......@@ -77,6 +77,9 @@
#define MSR_P6_EVNTSEL0 0x186
#define MSR_P6_EVNTSEL1 0x187
#define MSR_IA32_PERF_STATUS 0x198
#define MSR_IA32_PERF_CTL 0x199
#define MSR_IA32_THERM_CONTROL 0x19a
#define MSR_IA32_THERM_INTERRUPT 0x19b
#define MSR_IA32_THERM_STATUS 0x19c
......
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