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Commit 91926815 authored by Dave Jones's avatar Dave Jones Committed by Dave Jones
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[CPUFREQ] speedstep cleanups. 

From Dominik Brodowski.

- separate functions which might be useful for speedstep-piix4,
  speedstep-via or speedstep-bios into a new speedstep-lib.c.
- clean up speedstep-ich as it will only be used for ICH-based chipsets
  in future.   
- remove now-obsolete speedstep_coppermine parameter
parent 1dd75dde
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Showing with 406 additions and 464 deletions
Documentation/cpu-freq/user-guide.txt
View file @ 91926815
......@@ -56,19 +56,15 @@ 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 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
various processors on some ACPI 2.0-compatible systems [**]
various processors on some ACPI 2.0-compatible systems [*]
[*] only certain Intel mobile PIII processors are supported. If you
know that you own a speedstep-capable processor, pass the option
"speedstep_coppermine=1" to the module speedstep.o
[**] Only if "ACPI Processor Performance States" are available
[*] Only if "ACPI Processor Performance States" are available
to the ACPI<->BIOS interface.
......
arch/i386/kernel/cpu/cpufreq/Kconfig
View file @ 91926815
......@@ -123,6 +123,11 @@ config X86_SPEEDSTEP_CENTRINO
If in doubt, say N.
config X86_SPEEDSTEP_LIB
tristate
depends on X86_SPEEDSTEP_ICH
default X86_SPEEDSTEP_ICH
config X86_P4_CLOCKMOD
tristate "Intel Pentium 4 clock modulation"
depends on CPU_FREQ_TABLE
......
arch/i386/kernel/cpu/cpufreq/Makefile
View file @ 91926815
......@@ -8,6 +8,7 @@ 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
obj-$(CONFIG_X86_SPEEDSTEP_LIB) += speedstep-lib.o
ifdef CONFIG_X86_ACPI_CPUFREQ
ifdef CONFIG_ACPI_DEBUG
......
arch/i386/kernel/cpu/cpufreq/speedstep-ich.c
View file @ 91926815
/*
* $Id: speedstep.c,v 1.70 2003/02/22 10:23:46 db Exp $
*
* (C) 2001 Dave Jones, Arjan van de ven.
* (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
*
......@@ -27,46 +25,32 @@
#include <linux/pci.h>
#include <linux/slab.h>
#include <asm/msr.h>
#include "speedstep-lib.h"
/* speedstep_chipset:
* It is necessary to know which chipset is used. As accesses to
* this device occur at various places in this module, we need a
* static struct pci_dev * pointing to that device.
*/
static unsigned int speedstep_chipset;
static struct pci_dev *speedstep_chipset_dev;
#define SPEEDSTEP_CHIPSET_ICH2M 0x00000002
#define SPEEDSTEP_CHIPSET_ICH3M 0x00000003
#define SPEEDSTEP_CHIPSET_ICH4M 0x00000004
/* speedstep_processor
*/
static unsigned int speedstep_processor = 0;
static int speedstep_coppermine = 0;
#define SPEEDSTEP_PROCESSOR_PIII_C 0x00000001 /* Coppermine core */
#define SPEEDSTEP_PROCESSOR_PIII_T 0x00000002 /* Tualatin core */
#define SPEEDSTEP_PROCESSOR_P4M 0x00000003 /* P4-M with 100 MHz FSB */
/* speedstep_[low,high]_freq
/*
* There are only two frequency states for each processor. Values
* are in kHz for the time being.
*/
#define SPEEDSTEP_HIGH 0x00000000
#define SPEEDSTEP_LOW 0x00000001
static struct cpufreq_frequency_table speedstep_freqs[] = {
{SPEEDSTEP_HIGH, 0},
{SPEEDSTEP_LOW, 0},
{0, CPUFREQ_TABLE_END},
};
#define speedstep_low_freq speedstep_freqs[SPEEDSTEP_LOW].frequency
#define speedstep_high_freq speedstep_freqs[SPEEDSTEP_HIGH].frequency
/* DEBUG
* Define it if you want verbose debug output, e.g. for bug reporting
......@@ -80,93 +64,30 @@ static struct cpufreq_frequency_table speedstep_freqs[] = {
#endif
/*********************************************************************
* LOW LEVEL CHIPSET INTERFACE *
*********************************************************************/
/**
* speedstep_get_state - read the current SpeedStep state
* @state: Speedstep state (SPEEDSTEP_LOW or SPEEDSTEP_HIGH)
*
* Tries to read the SpeedStep state. Returns -EIO when there has been
* trouble to read the status or write to the control register, -EINVAL
* on an unsupported chipset, and zero on success.
*/
static int speedstep_get_state (unsigned int *state)
{
unsigned long flags;
u32 pmbase;
u8 value;
if (!speedstep_chipset_dev || !state)
return -EINVAL;
switch (speedstep_chipset) {
case SPEEDSTEP_CHIPSET_ICH2M:
case SPEEDSTEP_CHIPSET_ICH3M:
case SPEEDSTEP_CHIPSET_ICH4M:
/* get PMBASE */
pci_read_config_dword(speedstep_chipset_dev, 0x40, &pmbase);
if (!(pmbase & 0x01))
return -EIO;
pmbase &= 0xFFFFFFFE;
if (!pmbase)
return -EIO;
/* read state */
local_irq_save(flags);
value = inb(pmbase + 0x50);
local_irq_restore(flags);
dprintk(KERN_DEBUG "cpufreq: read at pmbase 0x%x + 0x50 returned 0x%x\n", pmbase, value);
*state = value & 0x01;
return 0;
}
printk (KERN_ERR "cpufreq: setting CPU frequency on this chipset unsupported.\n");
return -EINVAL;
}
/**
* speedstep_set_state - set the SpeedStep state
* @state: new processor frequency state (SPEEDSTEP_LOW or SPEEDSTEP_HIGH)
*
* Tries to change the SpeedStep state.
*/
static void speedstep_set_state (unsigned int state, int notify)
static void speedstep_set_state (unsigned int state, unsigned int notify)
{
u32 pmbase;
u8 pm2_blk;
u8 value;
unsigned long flags;
unsigned int oldstate;
struct cpufreq_freqs freqs;
if (!speedstep_chipset_dev || (state > 0x1))
return;
if (speedstep_get_state(&oldstate))
return;
if (oldstate == state)
return;
freqs.old = (oldstate == SPEEDSTEP_HIGH) ? speedstep_high_freq : speedstep_low_freq;
freqs.new = (state == SPEEDSTEP_HIGH) ? speedstep_high_freq : speedstep_low_freq;
freqs.old = speedstep_get_processor_frequency(speedstep_processor);
freqs.new = speedstep_freqs[SPEEDSTEP_LOW].frequency;
freqs.cpu = 0; /* speedstep.c is UP only driver */
if (notify)
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
switch (speedstep_chipset) {
case SPEEDSTEP_CHIPSET_ICH2M:
case SPEEDSTEP_CHIPSET_ICH3M:
case SPEEDSTEP_CHIPSET_ICH4M:
/* get PMBASE */
pci_read_config_dword(speedstep_chipset_dev, 0x40, &pmbase);
if (!(pmbase & 0x01))
......@@ -220,10 +141,6 @@ static void speedstep_set_state (unsigned int state, int notify)
} else {
printk (KERN_ERR "cpufreq: change failed - I/O error\n");
}
break;
default:
printk (KERN_ERR "cpufreq: setting CPU frequency on this chipset unsupported.\n");
}
if (notify)
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
......@@ -240,16 +157,11 @@ static void speedstep_set_state (unsigned int state, int notify)
*/
static int speedstep_activate (void)
{
u16 value = 0;
if (!speedstep_chipset_dev)
return -EINVAL;
switch (speedstep_chipset) {
case SPEEDSTEP_CHIPSET_ICH2M:
case SPEEDSTEP_CHIPSET_ICH3M:
case SPEEDSTEP_CHIPSET_ICH4M:
{
u16 value = 0;
pci_read_config_word(speedstep_chipset_dev,
0x00A0, &value);
if (!(value & 0x08)) {
......@@ -260,11 +172,6 @@ static int speedstep_activate (void)
}
return 0;
}
}
printk (KERN_ERR "cpufreq: SpeedStep (TM) on this chipset unsupported.\n");
return -EINVAL;
}
......@@ -284,7 +191,7 @@ static unsigned int speedstep_detect_chipset (void)
PCI_ANY_ID,
NULL);
if (speedstep_chipset_dev)
return SPEEDSTEP_CHIPSET_ICH4M;
return 4; /* 4-M */
speedstep_chipset_dev = pci_find_subsys(PCI_VENDOR_ID_INTEL,
PCI_DEVICE_ID_INTEL_82801CA_12,
......@@ -292,7 +199,7 @@ static unsigned int speedstep_detect_chipset (void)
PCI_ANY_ID,
NULL);
if (speedstep_chipset_dev)
return SPEEDSTEP_CHIPSET_ICH3M;
return 3; /* 3-M */
speedstep_chipset_dev = pci_find_subsys(PCI_VENDOR_ID_INTEL,
......@@ -315,7 +222,7 @@ static unsigned int speedstep_detect_chipset (void)
NULL);
if (!hostbridge)
return SPEEDSTEP_CHIPSET_ICH2M;
return 2; /* 2-M */
pci_read_config_byte(hostbridge, PCI_REVISION_ID, &rev);
if (rev < 5) {
......@@ -324,270 +231,13 @@ static unsigned int speedstep_detect_chipset (void)
return 0;
}
return SPEEDSTEP_CHIPSET_ICH2M;
return 2; /* 2-M */
}
return 0;
}
/*********************************************************************
* LOW LEVEL PROCESSOR INTERFACE *
*********************************************************************/
/**
* pentium3_get_frequency - get the core frequencies for PIIIs
*
* Returns the core frequency of a Pentium III processor (in kHz)
*/
static unsigned int pentium3_get_frequency (void)
{
/* See table 14 of p3_ds.pdf and table 22 of 29834003.pdf */
struct {
unsigned int ratio; /* Frequency Multiplier (x10) */
u8 bitmap; /* power on configuration bits
[27, 25:22] (in MSR 0x2a) */
} msr_decode_mult [] = {
{ 30, 0x01 },
{ 35, 0x05 },
{ 40, 0x02 },
{ 45, 0x06 },
{ 50, 0x00 },
{ 55, 0x04 },
{ 60, 0x0b },
{ 65, 0x0f },
{ 70, 0x09 },
{ 75, 0x0d },
{ 80, 0x0a },
{ 85, 0x26 },
{ 90, 0x20 },
{ 100, 0x2b },
{ 0, 0xff } /* error or unknown value */
};
/* PIII(-M) FSB settings: see table b1-b of 24547206.pdf */
struct {
unsigned int value; /* Front Side Bus speed in MHz */
u8 bitmap; /* power on configuration bits [18: 19]
(in MSR 0x2a) */
} msr_decode_fsb [] = {
{ 66, 0x0 },
{ 100, 0x2 },
{ 133, 0x1 },
{ 0, 0xff}
};
u32 msr_lo, msr_tmp;
int i = 0, j = 0;
struct cpuinfo_x86 *c = cpu_data;
/* read MSR 0x2a - we only need the low 32 bits */
rdmsr(MSR_IA32_EBL_CR_POWERON, msr_lo, msr_tmp);
dprintk(KERN_DEBUG "cpufreq: P3 - MSR_IA32_EBL_CR_POWERON: 0x%x 0x%x\n", msr_lo, msr_tmp);
msr_tmp = msr_lo;
/* decode the FSB */
msr_tmp &= 0x00c0000;
msr_tmp >>= 18;
while (msr_tmp != msr_decode_fsb[i].bitmap) {
if (msr_decode_fsb[i].bitmap == 0xff)
return -EINVAL;
i++;
}
/* decode the multiplier */
if ((c->x86_model == 0x08) && (c->x86_mask == 0x01))
/* different on early Coppermine PIII */
msr_lo &= 0x03c00000;
else
msr_lo &= 0x0bc00000;
msr_lo >>= 22;
while (msr_lo != msr_decode_mult[j].bitmap) {
if (msr_decode_mult[j].bitmap == 0xff)
return -EINVAL;
j++;
}
return (msr_decode_mult[j].ratio * msr_decode_fsb[i].value * 100);
}
/**
* pentium4_get_frequency - get the core frequency for P4-Ms
*
* Should return the core frequency (in kHz) for P4-Ms.
*/
static unsigned int pentium4_get_frequency(void)
{
u32 msr_lo, msr_hi;
rdmsr(0x2c, msr_lo, msr_hi);
dprintk(KERN_DEBUG "cpufreq: P4 - MSR_EBC_FREQUENCY_ID: 0x%x 0x%x\n", msr_lo, msr_hi);
/* First 12 bits seem to change a lot (0x511, 0x410 and 0x30f seen
* yet). Next 12 bits always seem to be 0x300. If this is not true
* on this CPU, complain. Last 8 bits are frequency (in 100MHz).
*/
if (msr_hi || ((msr_lo & 0x00FFF000) != 0x300000)) {
printk(KERN_DEBUG "cpufreq: P4 - MSR_EBC_FREQUENCY_ID: 0x%x 0x%x\n", msr_lo, msr_hi);
printk(KERN_INFO "cpufreq: problem in initialization. Please contact Dominik Brodowski\n");
printk(KERN_INFO "cpufreq: <linux@brodo.de> and attach this dmesg. Thanks in advance\n");
return 0;
}
msr_lo >>= 24;
return (msr_lo * 100000);
}
/**
* speedstep_detect_processor - detect Intel SpeedStep-capable processors.
*
* Returns the SPEEDSTEP_PROCESSOR_-number for the detected processor,
* or zero on failure.
*/
static unsigned int speedstep_detect_processor (void)
{
struct cpuinfo_x86 *c = cpu_data;
u32 ebx;
if ((c->x86_vendor != X86_VENDOR_INTEL) ||
((c->x86 != 6) && (c->x86 != 0xF)))
return 0;
if (c->x86 == 0xF) {
/* Intel Pentium 4 Mobile P4-M */
if (c->x86_model != 2)
return 0;
if ((c->x86_mask != 4) && (c->x86_mask != 7))
return 0;
ebx = cpuid_ebx(0x00000001);
ebx &= 0x000000FF;
if ((ebx != 0x0e) && (ebx != 0x0f))
return 0;
return SPEEDSTEP_PROCESSOR_P4M;
}
switch (c->x86_model) {
case 0x0B: /* Intel PIII [Tualatin] */
/* cpuid_ebx(1) is 0x04 for desktop PIII,
0x06 for mobile PIII-M */
ebx = cpuid_ebx(0x00000001);
ebx &= 0x000000FF;
if (ebx != 0x06)
return 0;
/* So far all PIII-M processors support SpeedStep. See
* Intel's 24540633.pdf of August 2002
*/
return SPEEDSTEP_PROCESSOR_PIII_T;
case 0x08: /* Intel PIII [Coppermine] */
{
u32 msr_lo, msr_hi;
/* all mobile PIII Coppermines have FSB 100 MHz
* ==> sort out a few desktop PIIIs. */
rdmsr(MSR_IA32_EBL_CR_POWERON, msr_lo, msr_hi);
dprintk(KERN_DEBUG "cpufreq: Coppermine: MSR_IA32_EBL_Cr_POWERON is 0x%x, 0x%x\n", msr_lo, msr_hi);
msr_lo &= 0x00c0000;
if (msr_lo != 0x0080000)
return 0;
if (speedstep_coppermine)
return SPEEDSTEP_PROCESSOR_PIII_C;
/*
* If the processor is a mobile version,
* platform ID has bit 50 set
* it has SpeedStep technology if either
* bit 56 or 57 is set
*/
rdmsr(MSR_IA32_PLATFORM_ID, msr_lo, msr_hi);
dprintk(KERN_DEBUG "cpufreq: Coppermine: MSR_IA32_PLATFORM ID is 0x%x, 0x%x\n", msr_lo, msr_hi);
if ((msr_hi & (1<<18)) && (msr_hi & (3<<24)))
return SPEEDSTEP_PROCESSOR_PIII_C;
printk(KERN_INFO "cpufreq: in case this is a SpeedStep-capable Intel Pentium III Coppermine\n");
printk(KERN_INFO "cpufreq: processor, please pass the boot option or module parameter\n");
printk(KERN_INFO "cpufreq: `speedstep_coppermine=1` to the kernel. Thanks!\n");
return 0;
}
default:
return 0;
}
}
/*********************************************************************
* HIGH LEVEL FUNCTIONS *
*********************************************************************/
/**
* speedstep_detect_speeds - detects low and high CPU frequencies.
*
* Detects the low and high CPU frequencies in kHz. Returns 0 on
* success or -EINVAL / -EIO on problems.
*/
static int speedstep_detect_speeds (void)
{
unsigned long flags;
unsigned int state;
int i, result;
/* Disable irqs for entire detection process */
local_irq_save(flags);
for (i=0; i<2; i++) {
/* read the current state */
result = speedstep_get_state(&state);
if (result) {
local_irq_restore(flags);
return result;
}
/* save the correct value, and switch to other */
if (state == SPEEDSTEP_LOW) {
switch (speedstep_processor) {
case SPEEDSTEP_PROCESSOR_PIII_C:
case SPEEDSTEP_PROCESSOR_PIII_T:
speedstep_low_freq = pentium3_get_frequency();
break;
case SPEEDSTEP_PROCESSOR_P4M:
speedstep_low_freq = pentium4_get_frequency();
}
speedstep_set_state(SPEEDSTEP_HIGH, 0);
} else {
switch (speedstep_processor) {
case SPEEDSTEP_PROCESSOR_PIII_C:
case SPEEDSTEP_PROCESSOR_PIII_T:
speedstep_high_freq = pentium3_get_frequency();
break;
case SPEEDSTEP_PROCESSOR_P4M:
speedstep_high_freq = pentium4_get_frequency();
}
speedstep_set_state(SPEEDSTEP_LOW, 0);
}
}
local_irq_restore(flags);
if (!speedstep_low_freq || !speedstep_high_freq ||
(speedstep_low_freq == speedstep_high_freq))
return -EIO;
return 0;
}
/**
* speedstep_setpolicy - set a new CPUFreq policy
* @policy: new policy
......@@ -632,22 +282,24 @@ static int speedstep_cpu_init(struct cpufreq_policy *policy)
return -ENODEV;
/* detect low and high frequency */
result = speedstep_detect_speeds();
result = speedstep_get_freqs(speedstep_processor,
&speedstep_freqs[SPEEDSTEP_LOW].frequency,
&speedstep_freqs[SPEEDSTEP_HIGH].frequency,
&speedstep_set_state);
if (result)
return result;
/* get current speed setting */
result = speedstep_get_state(&speed);
if (result)
return result;
speed = speedstep_get_processor_frequency(speedstep_processor);
if (!speed)
return -EIO;
speed = (speed == SPEEDSTEP_LOW) ? speedstep_low_freq : speedstep_high_freq;
dprintk(KERN_INFO "cpufreq: currently at %s speed setting - %i MHz\n",
(speed == speedstep_low_freq) ? "low" : "high",
(speed / 1000));
/* cpuinfo and default policy values */
policy->policy = (speed == speedstep_low_freq) ?
policy->policy = (speed == speedstep_freqs[SPEEDSTEP_LOW].frequency) ?
CPUFREQ_POLICY_POWERSAVE : CPUFREQ_POLICY_PERFORMANCE;
policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
policy->cur = speed;
......@@ -656,26 +308,6 @@ static int speedstep_cpu_init(struct cpufreq_policy *policy)
}
#ifndef MODULE
/**
* speedstep_setup speedstep command line parameter parsing
*
* speedstep command line parameter. Use:
* speedstep_coppermine=1
* if the CPU in your notebook is a SpeedStep-capable Intel
* Pentium III Coppermine. These processors cannot be detected
* automatically, as Intel continues to consider the detection
* algorithm as proprietary material.
*/
static int __init speedstep_setup(char *str)
{
speedstep_coppermine = simple_strtoul(str, &str, 0);
return 1;
}
__setup("speedstep_coppermine=", speedstep_setup);
#endif
static struct cpufreq_driver speedstep_driver = {
.name = "speedstep",
.verify = speedstep_verify,
......@@ -694,20 +326,17 @@ static struct cpufreq_driver speedstep_driver = {
*/
static int __init speedstep_init(void)
{
/* detect chipset */
speedstep_chipset = speedstep_detect_chipset();
/* detect chipset */
if (speedstep_chipset)
/* detect processor */
speedstep_processor = speedstep_detect_processor();
if (!speedstep_processor)
return -ENODEV;
if ((!speedstep_chipset) || (!speedstep_processor)) {
printk(KERN_INFO "cpufreq: Intel(R) SpeedStep(TM) for this %s not (yet) available.\n", speedstep_chipset ? "processor" : "chipset");
/* detect chipset */
if (!speedstep_detect_chipset()) {
printk(KERN_INFO "cpufreq: Intel(R) SpeedStep(TM) for this chipset not (yet) available.\n");
return -ENODEV;
}
dprintk(KERN_INFO "cpufreq: Intel(R) SpeedStep(TM) support $Revision: 1.70 $\n");
/* activate speedstep support */
if (speedstep_activate())
return -EINVAL;
......@@ -727,10 +356,8 @@ static void __exit speedstep_exit(void)
}
MODULE_PARM (speedstep_coppermine, "i");
MODULE_AUTHOR ("Dave Jones <davej@suse.de>, Dominik Brodowski <linux@brodo.de>");
MODULE_DESCRIPTION ("Speedstep driver for Intel mobile processors.");
MODULE_DESCRIPTION ("Speedstep driver for Intel mobile processors on chipsets with ICH-M southbridges.");
MODULE_LICENSE ("GPL");
module_init(speedstep_init);
......
arch/i386/kernel/cpu/cpufreq/speedstep-lib.c 0 → 100644
View file @ 91926815
/*
* (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
*
* Licensed under the terms of the GNU GPL License version 2.
*
* Library for common functions for Intel SpeedStep v.1 and v.2 support
*
* BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <asm/msr.h>
#include "speedstep-lib.h"
/* DEBUG
* Define it if you want verbose debug output, e.g. for bug reporting
*/
//#define SPEEDSTEP_DEBUG
#ifdef SPEEDSTEP_DEBUG
#define dprintk(msg...) printk(msg)
#else
#define dprintk(msg...) do { } while(0)
#endif
/*********************************************************************
* GET PROCESSOR CORE SPEED IN KHZ *
*********************************************************************/
static unsigned int pentium3_get_frequency (unsigned int processor)
{
/* See table 14 of p3_ds.pdf and table 22 of 29834003.pdf */
struct {
unsigned int ratio; /* Frequency Multiplier (x10) */
u8 bitmap; /* power on configuration bits
[27, 25:22] (in MSR 0x2a) */
} msr_decode_mult [] = {
{ 30, 0x01 },
{ 35, 0x05 },
{ 40, 0x02 },
{ 45, 0x06 },
{ 50, 0x00 },
{ 55, 0x04 },
{ 60, 0x0b },
{ 65, 0x0f },
{ 70, 0x09 },
{ 75, 0x0d },
{ 80, 0x0a },
{ 85, 0x26 },
{ 90, 0x20 },
{ 100, 0x2b },
{ 0, 0xff } /* error or unknown value */
};
/* PIII(-M) FSB settings: see table b1-b of 24547206.pdf */
struct {
unsigned int value; /* Front Side Bus speed in MHz */
u8 bitmap; /* power on configuration bits [18: 19]
(in MSR 0x2a) */
} msr_decode_fsb [] = {
{ 66, 0x0 },
{ 100, 0x2 },
{ 133, 0x1 },
{ 0, 0xff}
};
u32 msr_lo, msr_tmp;
int i = 0, j = 0;
/* read MSR 0x2a - we only need the low 32 bits */
rdmsr(MSR_IA32_EBL_CR_POWERON, msr_lo, msr_tmp);
dprintk(KERN_DEBUG "speedstep-lib: P3 - MSR_IA32_EBL_CR_POWERON: 0x%x 0x%x\n", msr_lo, msr_tmp);
msr_tmp = msr_lo;
/* decode the FSB */
msr_tmp &= 0x00c0000;
msr_tmp >>= 18;
while (msr_tmp != msr_decode_fsb[i].bitmap) {
if (msr_decode_fsb[i].bitmap == 0xff)
return 0;
i++;
}
/* decode the multiplier */
if (processor == SPEEDSTEP_PROCESSOR_PIII_C_EARLY)
msr_lo &= 0x03c00000;
else
msr_lo &= 0x0bc00000;
msr_lo >>= 22;
while (msr_lo != msr_decode_mult[j].bitmap) {
if (msr_decode_mult[j].bitmap == 0xff)
return 0;
j++;
}
return (msr_decode_mult[j].ratio * msr_decode_fsb[i].value * 100);
}
static unsigned int pentium4_get_frequency(void)
{
u32 msr_lo, msr_hi;
rdmsr(0x2c, msr_lo, msr_hi);
dprintk(KERN_DEBUG "speedstep-lib: P4 - MSR_EBC_FREQUENCY_ID: 0x%x 0x%x\n", msr_lo, msr_hi);
msr_lo >>= 24;
return (msr_lo * 100000);
}
unsigned int speedstep_get_processor_frequency(unsigned int processor)
{
switch (processor) {
case SPEEDSTEP_PROCESSOR_P4M:
return pentium4_get_frequency();
case SPEEDSTEP_PROCESSOR_PIII_T:
case SPEEDSTEP_PROCESSOR_PIII_C:
case SPEEDSTEP_PROCESSOR_PIII_C_EARLY:
return pentium3_get_frequency(processor);
default:
return 0;
};
return 0;
}
EXPORT_SYMBOL_GPL(speedstep_get_processor_frequency);
/*********************************************************************
* DETECT SPEEDSTEP-CAPABLE PROCESSOR *
*********************************************************************/
unsigned int speedstep_detect_processor (void)
{
struct cpuinfo_x86 *c = cpu_data;
u32 ebx, msr_lo, msr_hi;
if ((c->x86_vendor != X86_VENDOR_INTEL) ||
((c->x86 != 6) && (c->x86 != 0xF)))
return 0;
if (c->x86 == 0xF) {
/* Intel Pentium 4 Mobile P4-M */
if (c->x86_model != 2)
return 0;
if ((c->x86_mask != 4) && (c->x86_mask != 7))
return 0;
ebx = cpuid_ebx(0x00000001);
ebx &= 0x000000FF;
if ((ebx != 0x0e) && (ebx != 0x0f))
return 0;
return SPEEDSTEP_PROCESSOR_P4M;
}
switch (c->x86_model) {
case 0x0B: /* Intel PIII [Tualatin] */
/* cpuid_ebx(1) is 0x04 for desktop PIII,
0x06 for mobile PIII-M */
ebx = cpuid_ebx(0x00000001);
ebx &= 0x000000FF;
if (ebx != 0x06)
return 0;
/* So far all PIII-M processors support SpeedStep. See
* Intel's 24540640.pdf of June 2003
*/
return SPEEDSTEP_PROCESSOR_PIII_T;
case 0x08: /* Intel PIII [Coppermine] */
/* all mobile PIII Coppermines have FSB 100 MHz
* ==> sort out a few desktop PIIIs. */
rdmsr(MSR_IA32_EBL_CR_POWERON, msr_lo, msr_hi);
dprintk(KERN_DEBUG "cpufreq: Coppermine: MSR_IA32_EBL_CR_POWERON is 0x%x, 0x%x\n", msr_lo, msr_hi);
msr_lo &= 0x00c0000;
if (msr_lo != 0x0080000)
return 0;
/*
* If the processor is a mobile version,
* platform ID has bit 50 set
* it has SpeedStep technology if either
* bit 56 or 57 is set
*/
rdmsr(MSR_IA32_PLATFORM_ID, msr_lo, msr_hi);
dprintk(KERN_DEBUG "cpufreq: Coppermine: MSR_IA32_PLATFORM ID is 0x%x, 0x%x\n", msr_lo, msr_hi);
if ((msr_hi & (1<<18)) && (msr_hi & (3<<24))) {
if (c->x86_mask == 0x01)
return SPEEDSTEP_PROCESSOR_PIII_C_EARLY;
else
return SPEEDSTEP_PROCESSOR_PIII_C;
}
default:
return 0;
}
}
EXPORT_SYMBOL_GPL(speedstep_detect_processor);
/*********************************************************************
* DETECT SPEEDSTEP SPEEDS *
*********************************************************************/
unsigned int speedstep_get_freqs(unsigned int processor,
unsigned int *low_speed,
unsigned int *high_speed,
void (*set_state) (unsigned int state,
unsigned int notify)
)
{
unsigned int prev_speed;
unsigned int ret = 0;
unsigned long flags;
if ((!processor) || (!low_speed) || (!high_speed) || (!set_state))
return EINVAL;
/* get current speed */
prev_speed = speedstep_get_processor_frequency(processor);
if (!prev_speed)
return EIO;
local_irq_save(flags);
/* switch to low state */
set_state(SPEEDSTEP_LOW, 0);
*low_speed = speedstep_get_processor_frequency(processor);
if (!*low_speed) {
ret = EIO;
goto out;
}
/* switch to high state */
set_state(SPEEDSTEP_HIGH, 0);
*high_speed = speedstep_get_processor_frequency(processor);
if (!*high_speed) {
ret = EIO;
goto out;
}
if (*low_speed == *high_speed) {
ret = ENODEV;
goto out;
}
/* switch to previous state, if necessary */
if (*high_speed != prev_speed)
set_state(SPEEDSTEP_LOW, 0);
out:
local_irq_restore(flags);
return (ret);
}
EXPORT_SYMBOL_GPL(speedstep_get_freqs);
MODULE_AUTHOR ("Dominik Brodowski <linux@brodo.de>");
MODULE_DESCRIPTION ("Library for Intel SpeedStep 1 or 2 cpufreq drivers.");
MODULE_LICENSE ("GPL");
arch/i386/kernel/cpu/cpufreq/speedstep-lib.h 0 → 100644
View file @ 91926815
/*
* (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
*
* Licensed under the terms of the GNU GPL License version 2.
*
* Library for common functions for Intel SpeedStep v.1 and v.2 support
*
* BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
*/
/* processors */
#define SPEEDSTEP_PROCESSOR_PIII_C_EARLY 0x00000001 /* Coppermine core */
#define SPEEDSTEP_PROCESSOR_PIII_C 0x00000002 /* Coppermine core */
#define SPEEDSTEP_PROCESSOR_PIII_T 0x00000003 /* Tualatin core */
#define SPEEDSTEP_PROCESSOR_P4M 0x00000004 /* P4-M with 100 MHz FSB */
/* speedstep states -- only two of them */
#define SPEEDSTEP_HIGH 0x00000000
#define SPEEDSTEP_LOW 0x00000001
/* detect a speedstep-capable processor */
extern unsigned int speedstep_detect_processor (void);
/* detect the current speed (in khz) of the processor */
extern unsigned int speedstep_get_processor_frequency(unsigned int processor);
/* detect the low and high speeds of the processor. The callback
* set_state"'s first argument is either SPEEDSTEP_HIGH or
* SPEEDSTEP_LOW; the second argument is zero so that no
* cpufreq_notify_transition calls are initiated.
*/
extern unsigned int speedstep_get_freqs(unsigned int processor,
unsigned int *low_speed,
unsigned int *high_speed,
void (*set_state) (unsigned int state, unsigned int notify));
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