Mailinglist Archive: opensuse-mobile-de (438 mails)
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Re: [suse-laptop] lüfterlärm mindern
- From: Lukas Schrangl <schrangl@xxxxxxx>
- Date: Wed, 2 Jun 2004 20:41:41 +0200
- Message-id: <200406022041.42034.schrangl@xxxxxxx>
Hallo!
cd /usr/src/linux
make cloneconfig
make bzImage modules modules_install
cp arch/i386/boot/bzImage /boot/vmlinuz-xxxx
wobei du statt xxxx deine Kernelversion einsetzen (also z. B.
2.6.4-54.5-athlon), schau einfach nach, wie es in /boot heißt.
Ich bin draufgekommen, ich war etwas voreilig, gestern hab ich mal den 2.6.6
inspiziert, da bin ich draufgekommen, dass der von selbst die ACPI- Tabellen
inspiziert, wenn er keine BIOS Tabellen findet. Solltest mal die
powernow-k7.c vom 2.6.6er nehmen - sollte funktionieren, aber dafür musst du
noch in den Kernel das ACPI- Prozessormodul einbauen (nicht als Modul!).
Das geht in dem du (als root):
cd /usr/src/linux
make cloneconfig
make xconfig
---------------------
nun erscheint ein Fenster, dort musst du in der rechten Spalte bei
Powermanagment auf ACPI klicken und dann auf der linken Seite so oft auf das
Kästchen neben Prozessor klicken, bis dort ein Häkchen ist.
Dann das Ganze speichern und beenden, dann
----------------------
make bzImage modules modules_install
cp arch/i386/boot/bzImage /boot/vmlinuz-xxxx
Grüße, Lukas
Am Dienstag, 1. Juni 2004 15:05 schrieb Jonas Zehnder:
/*
* AMD K7 Powernow driver.
* (C) 2003 Dave Jones <davej@xxxxxxxxxxxxxxxxx> on behalf of SuSE Labs.
* (C) 2003-2004 Dave Jones <davej@xxxxxxxxxx>
*
* Licensed under the terms of the GNU GPL License version 2.
* Based upon datasheets & sample CPUs kindly provided by AMD.
*
* BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
*
* 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.
* 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.
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <asm/msr.h>
#include <asm/timex.h>
#include <asm/io.h>
#include <asm/system.h>
#ifdef CONFIG_ACPI_PROCESSOR
#include <linux/acpi.h>
#include <acpi/processor.h>
#endif
#include "powernow-k7.h"
#define DEBUG
#ifdef DEBUG
#define dprintk(msg...) printk(msg)
#else
#define dprintk(msg...) do { } while(0)
#endif
#define PFX "powernow: "
struct psb_s {
u8 signature[10];
u8 tableversion;
u8 flags;
u16 settlingtime;
u8 reserved1;
u8 numpst;
};
struct pst_s {
u32 cpuid;
u8 fsbspeed;
u8 maxfid;
u8 startvid;
u8 numpstates;
};
#ifdef CONFIG_ACPI_PROCESSOR
union powernow_acpi_control_t {
struct {
unsigned long fid:5,
vid:5,
sgtc:20,
res1:2;
} bits;
unsigned long val;
};
#endif
/* divide by 1000 to get VID. */
static int mobile_vid_table[32] = {
2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650,
1600, 1550, 1500, 1450, 1400, 1350, 1300, 0,
1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100,
1075, 1050, 1024, 1000, 975, 950, 925, 0,
};
/* divide by 10 to get FID. */
static int fid_codes[32] = {
110, 115, 120, 125, 50, 55, 60, 65,
70, 75, 80, 85, 90, 95, 100, 105,
30, 190, 40, 200, 130, 135, 140, 210,
150, 225, 160, 165, 170, 180, -1, -1,
};
/* This parameter is used in order to force ACPI instead of legacy method for
* configuration purpose.
*/
static int powernow_acpi_force;
static struct cpufreq_frequency_table *powernow_table;
static unsigned int can_scale_bus;
static unsigned int can_scale_vid;
static unsigned int minimum_speed=-1;
static unsigned int maximum_speed;
static unsigned int number_scales;
static unsigned int fsb;
static unsigned int latency;
static char have_a0;
static int check_fsb(unsigned int fsbspeed)
{
int delta;
unsigned int f = fsb / 1000;
delta = (fsbspeed > f) ? fsbspeed - f : f - fsbspeed;
return (delta < 5);
}
static int check_powernow(void)
{
struct cpuinfo_x86 *c = cpu_data;
unsigned int maxei, eax, ebx, ecx, edx;
if ((c->x86_vendor != X86_VENDOR_AMD) || (c->x86 !=6)) {
#ifdef MODULE
printk (KERN_INFO PFX "This module only works with AMD K7
CPUs\n");
#endif
return 0;
}
/* Get maximum capabilities */
maxei = cpuid_eax (0x80000000);
if (maxei < 0x80000007) { /* Any powernow info ? */
#ifdef MODULE
printk (KERN_INFO PFX "No powernow capabilities detected\n");
#endif
return 0;
}
if ((c->x86_model == 6) && (c->x86_mask == 0)) {
printk (KERN_INFO PFX "K7 660[A0] core detected, enabling
errata workarounds\n");
have_a0 = 1;
}
cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
printk (KERN_INFO PFX "PowerNOW! Technology present. Can scale: ");
if (edx & 1 << 1) {
printk ("frequency");
can_scale_bus=1;
}
if ((edx & (1 << 1 | 1 << 2)) == 0x6)
printk (" and ");
if (edx & 1 << 2) {
printk ("voltage");
can_scale_vid=1;
}
if (!(edx & (1 << 1 | 1 << 2))) {
printk ("nothing.\n");
return 0;
}
printk (".\n");
return 1;
}
static int get_ranges (unsigned char *pst)
{
unsigned int j;
unsigned int speed;
u8 fid, vid;
powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table) *
(number_scales + 1)), GFP_KERNEL);
if (!powernow_table)
return -ENOMEM;
memset(powernow_table, 0, (sizeof(struct cpufreq_frequency_table) *
(number_scales + 1)));
for (j=0 ; j < number_scales; j++) {
fid = *pst++;
powernow_table[j].frequency = (fsb * fid_codes[fid]) / 10;
powernow_table[j].index = fid; /* lower 8 bits */
speed = powernow_table[j].frequency;
if ((fid_codes[fid] % 10)==5) {
#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
if (have_a0 == 1)
powernow_table[j].frequency =
CPUFREQ_ENTRY_INVALID;
#endif
}
dprintk (KERN_INFO PFX " FID: 0x%x (%d.%dx [%dMHz])\t", fid,
fid_codes[fid] / 10, fid_codes[fid] % 10, speed/1000);
if (speed < minimum_speed)
minimum_speed = speed;
if (speed > maximum_speed)
maximum_speed = speed;
vid = *pst++;
powernow_table[j].index |= (vid << 8); /* upper 8 bits */
dprintk ("VID: 0x%x (%d.%03dV)\n", vid,
mobile_vid_table[vid]/1000,
mobile_vid_table[vid]%1000);
}
powernow_table[number_scales].frequency = CPUFREQ_TABLE_END;
powernow_table[number_scales].index = 0;
return 0;
}
static void change_FID(int fid)
{
union msr_fidvidctl fidvidctl;
rdmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val);
if (fidvidctl.bits.FID != fid) {
fidvidctl.bits.SGTC = latency;
fidvidctl.bits.FID = fid;
fidvidctl.bits.VIDC = 0;
fidvidctl.bits.FIDC = 1;
wrmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val);
}
}
static void change_VID(int vid)
{
union msr_fidvidctl fidvidctl;
rdmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val);
if (fidvidctl.bits.VID != vid) {
fidvidctl.bits.SGTC = latency;
fidvidctl.bits.VID = vid;
fidvidctl.bits.FIDC = 0;
fidvidctl.bits.VIDC = 1;
wrmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val);
}
}
static void change_speed (unsigned int index)
{
u8 fid, vid;
struct cpufreq_freqs freqs;
union msr_fidvidstatus fidvidstatus;
int cfid;
/* fid are the lower 8 bits of the index we stored into
* the cpufreq frequency table in powernow_decode_bios,
* vid are the upper 8 bits.
*/
fid = powernow_table[index].index & 0xFF;
vid = (powernow_table[index].index & 0xFF00) >> 8;
freqs.cpu = 0;
rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val);
cfid = fidvidstatus.bits.CFID;
freqs.old = fsb * fid_codes[cfid] / 10;
freqs.new = powernow_table[index].frequency;
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
/* Now do the magic poking into the MSRs. */
if (have_a0 == 1) /* A0 errata 5 */
local_irq_disable();
if (freqs.old > freqs.new) {
/* Going down, so change FID first */
change_FID(fid);
change_VID(vid);
} else {
/* Going up, so change VID first */
change_VID(vid);
change_FID(fid);
}
if (have_a0 == 1)
local_irq_enable();
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
}
#ifdef CONFIG_ACPI_PROCESSOR
struct acpi_processor_performance *acpi_processor_perf;
static int powernow_acpi_init(void)
{
int i;
int retval = 0;
union powernow_acpi_control_t pc;
if (acpi_processor_perf != NULL && powernow_table != NULL) {
retval = -EINVAL;
goto err0;
}
acpi_processor_perf = kmalloc(sizeof(struct acpi_processor_performance),
GFP_KERNEL);
if (!acpi_processor_perf) {
retval = -ENOMEM;
goto err0;
}
memset(acpi_processor_perf, 0, sizeof(struct
acpi_processor_performance));
if (acpi_processor_register_performance(acpi_processor_perf, 0)) {
retval = -EIO;
goto err1;
}
if (acpi_processor_perf->control_register.space_id !=
ACPI_ADR_SPACE_FIXED_HARDWARE) {
retval = -ENODEV;
goto err2;
}
if (acpi_processor_perf->status_register.space_id !=
ACPI_ADR_SPACE_FIXED_HARDWARE) {
retval = -ENODEV;
goto err2;
}
number_scales = acpi_processor_perf->state_count;
if (number_scales < 2) {
retval = -ENODEV;
goto err2;
}
powernow_table = kmalloc((number_scales + 1) * (sizeof(struct
cpufreq_frequency_table)), GFP_KERNEL);
if (!powernow_table) {
retval = -ENOMEM;
goto err2;
}
memset(powernow_table, 0, ((number_scales + 1) * sizeof(struct
cpufreq_frequency_table)));
pc.val = (unsigned long) acpi_processor_perf->states[0].control;
for (i = 0; i < number_scales; i++) {
u8 fid, vid;
unsigned int speed;
pc.val = (unsigned long) acpi_processor_perf->states[i].control;
dprintk (KERN_INFO PFX "acpi: P%d: %d MHz %d mW %d uS control
%08x SGTC %d\n",
i,
(u32) acpi_processor_perf->states[i].core_frequency,
(u32) acpi_processor_perf->states[i].power,
(u32)
acpi_processor_perf->states[i].transition_latency,
(u32) acpi_processor_perf->states[i].control,
pc.bits.sgtc);
vid = pc.bits.vid;
fid = pc.bits.fid;
powernow_table[i].frequency = fsb * fid_codes[fid] / 10;
powernow_table[i].index = fid; /* lower 8 bits */
powernow_table[i].index |= (vid << 8); /* upper 8 bits */
speed = powernow_table[i].frequency;
if ((fid_codes[fid] % 10)==5) {
if (have_a0 == 1)
powernow_table[i].frequency =
CPUFREQ_ENTRY_INVALID;
}
dprintk (KERN_INFO PFX " FID: 0x%x (%d.%dx [%dMHz])\t", fid,
fid_codes[fid] / 10, fid_codes[fid] % 10, speed/1000);
dprintk ("VID: 0x%x (%d.%03dV)\n", vid,
mobile_vid_table[vid]/1000,
mobile_vid_table[vid]%1000);
if (latency < pc.bits.sgtc)
latency = pc.bits.sgtc;
if (speed < minimum_speed)
minimum_speed = speed;
if (speed > maximum_speed)
maximum_speed = speed;
}
powernow_table[i].frequency = CPUFREQ_TABLE_END;
powernow_table[i].index = 0;
return 0;
err2:
acpi_processor_unregister_performance(acpi_processor_perf, 0);
err1:
kfree(acpi_processor_perf);
err0:
printk(KERN_WARNING PFX "ACPI perflib can not be used in this
platform\n");
acpi_processor_perf = NULL;
return retval;
}
#else
static int powernow_acpi_init(void)
{
printk(KERN_INFO PFX "no support for ACPI processor found."
" Please recompile your kernel with ACPI processor\n");
return -EINVAL;
}
#endif
static int powernow_decode_bios (int maxfid, int startvid)
{
struct psb_s *psb;
struct pst_s *pst;
unsigned int i, j;
unsigned char *p;
unsigned int etuple;
unsigned int ret;
etuple = cpuid_eax(0x80000001);
for (i=0xC0000; i < 0xffff0 ; i+=16) {
p = phys_to_virt(i);
if (memcmp(p, "AMDK7PNOW!", 10) == 0){
dprintk (KERN_INFO PFX "Found PSB header at %p\n", p);
psb = (struct psb_s *) p;
dprintk (KERN_INFO PFX "Table version: 0x%x\n",
psb->tableversion);
if (psb->tableversion != 0x12) {
printk (KERN_INFO PFX "Sorry, only v1.2 tables
supported right now\n");
return -ENODEV;
}
dprintk (KERN_INFO PFX "Flags: 0x%x (", psb->flags);
if ((psb->flags & 1)==0) {
dprintk ("Mobile");
} else {
dprintk ("Desktop");
}
dprintk (" voltage regulator)\n");
latency = psb->settlingtime;
if (latency < 100) {
printk (KERN_INFO PFX "BIOS set settling time
to %d microseconds."
"Should be at least 100.
Correcting.\n", latency);
latency = 100;
}
dprintk (KERN_INFO PFX "Settling Time: %d
microseconds.\n", psb->settlingtime);
dprintk (KERN_INFO PFX "Has %d PST tables. (Only
dumping ones relevant to this CPU).\n", psb->numpst);
p += sizeof (struct psb_s);
pst = (struct pst_s *) p;
for (i = 0 ; i <psb->numpst; i++) {
pst = (struct pst_s *) p;
number_scales = pst->numpstates;
if ((etuple == pst->cpuid) &&
check_fsb(pst->fsbspeed) &&
(maxfid==pst->maxfid) &&
(startvid==pst->startvid))
{
dprintk (KERN_INFO PFX "PST:%d
(@%p)\n", i, pst);
dprintk (KERN_INFO PFX " cpuid:
0x%x\t", pst->cpuid);
dprintk ("fsb: %d\t", pst->fsbspeed);
dprintk ("maxFID: 0x%x\t", pst->maxfid);
dprintk ("startvid: 0x%x\n",
pst->startvid);
ret = get_ranges ((char *) pst + sizeof
(struct pst_s));
return ret;
} else {
p = (char *) pst + sizeof (struct
pst_s);
for (j=0 ; j < number_scales; j++)
p+=2;
}
}
printk (KERN_INFO PFX "No PST tables match this cpuid
(0x%x)\n", etuple);
printk (KERN_INFO PFX "This is indicative of a broken
BIOS.\n");
return -EINVAL;
}
p++;
}
return -ENODEV;
}
static int powernow_target (struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
{
unsigned int newstate;
if (cpufreq_frequency_table_target(policy, powernow_table, target_freq,
relation, &newstate))
return -EINVAL;
change_speed(newstate);
return 0;
}
static int powernow_verify (struct cpufreq_policy *policy)
{
return cpufreq_frequency_table_verify(policy, powernow_table);
}
/*
* We use the fact that the bus frequency is somehow
* a multiple of 100000/3 khz, then we compute sgtc according
* to this multiple.
* That way, we match more how AMD thinks all of that work.
* We will then get the same kind of behaviour already tested under
* the "well-known" other OS.
*/
static int __init fixup_sgtc(void)
{
unsigned int sgtc;
unsigned int m;
m = fsb / 3333;
if ((m % 10) >= 5)
m += 5;
m /= 10;
sgtc = 100 * m * latency;
sgtc = sgtc / 3;
if (sgtc > 0xfffff) {
printk(KERN_WARNING PFX "SGTC too large %d\n", sgtc);
sgtc = 0xfffff;
}
return sgtc;
}
static int __init powernow_cpu_init (struct cpufreq_policy *policy)
{
union msr_fidvidstatus fidvidstatus;
int result;
if (policy->cpu != 0)
return -ENODEV;
rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val);
/* A K7 with powernow technology is set to max frequency by BIOS */
fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID];
if (!fsb) {
printk(KERN_WARNING PFX "can not determine bus frequency\n");
return -EINVAL;
}
dprintk(KERN_INFO PFX "FSB: %3d.%03d MHz\n", fsb/1000, fsb%1000);
if ((dmi_broken & BROKEN_CPUFREQ) || powernow_acpi_force) {
printk (KERN_INFO PFX "PSB/PST known to be broken. Trying ACPI
instead\n");
result = powernow_acpi_init();
} else {
result = powernow_decode_bios(fidvidstatus.bits.MFID,
fidvidstatus.bits.SVID);
if (result) {
printk (KERN_INFO PFX "Trying ACPI perflib\n");
maximum_speed = 0;
minimum_speed = -1;
latency = 0;
result = powernow_acpi_init();
if (result) {
printk (KERN_INFO PFX "ACPI and legacy methods
failed\n");
printk (KERN_INFO PFX "See
http://www.codemonkey.org.uk/projects/cpufreq/powernow-k7.shtml\n";);
}
} else {
/* SGTC use the bus clock as timer */
latency = fixup_sgtc();
printk(KERN_INFO PFX "SGTC: %d\n", latency);
}
}
if (result)
return result;
printk (KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz.\n",
minimum_speed/1000, maximum_speed/1000);
policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
policy->cpuinfo.transition_latency = 20 * latency / fsb;
policy->cur = maximum_speed;
cpufreq_frequency_table_get_attr(powernow_table, policy->cpu);
return cpufreq_frequency_table_cpuinfo(policy, powernow_table);
}
static int powernow_cpu_exit (struct cpufreq_policy *policy) {
cpufreq_frequency_table_put_attr(policy->cpu);
return 0;
}
static struct freq_attr* powernow_table_attr[] = {
&cpufreq_freq_attr_scaling_available_freqs,
NULL,
};
static struct cpufreq_driver powernow_driver = {
.verify = powernow_verify,
.target = powernow_target,
.init = powernow_cpu_init,
.exit = powernow_cpu_exit,
.name = "powernow-k7",
.owner = THIS_MODULE,
.attr = powernow_table_attr,
};
static int __init powernow_init (void)
{
if (check_powernow()==0)
return -ENODEV;
return cpufreq_register_driver(&powernow_driver);
}
static void __exit powernow_exit (void)
{
#ifdef CONFIG_ACPI_PROCESSOR
if (acpi_processor_perf) {
acpi_processor_unregister_performance(acpi_processor_perf, 0);
kfree(acpi_processor_perf);
}
#endif
cpufreq_unregister_driver(&powernow_driver);
if (powernow_table)
kfree(powernow_table);
}
module_param(powernow_acpi_force, int, 0444);
MODULE_PARM_DESC(acpi_force, "Force ACPI to be used");
MODULE_AUTHOR ("Dave Jones <davej@xxxxxxxxxxxxxxxxx>");
MODULE_DESCRIPTION ("Powernow driver for AMD K7 processors.");
MODULE_LICENSE ("GPL");
late_initcall(powernow_init);
module_exit(powernow_exit);
cd /usr/src/linux
make cloneconfig
make bzImage modules modules_install
cp arch/i386/boot/bzImage /boot/vmlinuz-xxxx
wobei du statt xxxx deine Kernelversion einsetzen (also z. B.
2.6.4-54.5-athlon), schau einfach nach, wie es in /boot heißt.
Ich bin draufgekommen, ich war etwas voreilig, gestern hab ich mal den 2.6.6
inspiziert, da bin ich draufgekommen, dass der von selbst die ACPI- Tabellen
inspiziert, wenn er keine BIOS Tabellen findet. Solltest mal die
powernow-k7.c vom 2.6.6er nehmen - sollte funktionieren, aber dafür musst du
noch in den Kernel das ACPI- Prozessormodul einbauen (nicht als Modul!).
Das geht in dem du (als root):
cd /usr/src/linux
make cloneconfig
make xconfig
---------------------
nun erscheint ein Fenster, dort musst du in der rechten Spalte bei
Powermanagment auf ACPI klicken und dann auf der linken Seite so oft auf das
Kästchen neben Prozessor klicken, bis dort ein Häkchen ist.
Dann das Ganze speichern und beenden, dann
----------------------
make bzImage modules modules_install
cp arch/i386/boot/bzImage /boot/vmlinuz-xxxx
Grüße, Lukas
Am Dienstag, 1. Juni 2004 15:05 schrieb Jonas Zehnder:
die /usr/src/linux/arch/i386/kernel/cpu/cpufreq/powernow-k7.c (ich nehme
mal an, die Kernel- Sources sind in /usr/src/linux installiert) durch die
powernow-k7.c, die ich dir schicke ersetzen, dann Kernel kompilieren und
reboot. Sollte funktionieren (nur für den 2.6er Kernel!)
Hallo,
vielen dank! Ich habe noch nie einen Kernel selbst kompiliert, darum
ein paar Fragen: ich muß den Kernel, hoffe ich, nicht komplett neu
konfigurieren sondern nach dem Austausch der Datei gehe ich nach
/usr/src/linux und führe aus: "make dep clean bzImage" Muß ich dann noch
make modules ausführen?
Dann
cp /boot/vmlinuz /boot/vmlinuz.old
cp arch/i386/boot/bzImage /boot/vmlinuz
Dann noch (wenn Module auch) make modules_intall.
Muß ich dann noch unter /lib/modules/ <alter kernel> powernow-k7 löschen
oder werden die alten Module automatisch überschrieben?
oder liege ich damit völlig falsch?
danke für die super Hilfe und bis dann!
jonas
/*
* AMD K7 Powernow driver.
* (C) 2003 Dave Jones <davej@xxxxxxxxxxxxxxxxx> on behalf of SuSE Labs.
* (C) 2003-2004 Dave Jones <davej@xxxxxxxxxx>
*
* Licensed under the terms of the GNU GPL License version 2.
* Based upon datasheets & sample CPUs kindly provided by AMD.
*
* BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
*
* 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.
* 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.
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <asm/msr.h>
#include <asm/timex.h>
#include <asm/io.h>
#include <asm/system.h>
#ifdef CONFIG_ACPI_PROCESSOR
#include <linux/acpi.h>
#include <acpi/processor.h>
#endif
#include "powernow-k7.h"
#define DEBUG
#ifdef DEBUG
#define dprintk(msg...) printk(msg)
#else
#define dprintk(msg...) do { } while(0)
#endif
#define PFX "powernow: "
struct psb_s {
u8 signature[10];
u8 tableversion;
u8 flags;
u16 settlingtime;
u8 reserved1;
u8 numpst;
};
struct pst_s {
u32 cpuid;
u8 fsbspeed;
u8 maxfid;
u8 startvid;
u8 numpstates;
};
#ifdef CONFIG_ACPI_PROCESSOR
union powernow_acpi_control_t {
struct {
unsigned long fid:5,
vid:5,
sgtc:20,
res1:2;
} bits;
unsigned long val;
};
#endif
/* divide by 1000 to get VID. */
static int mobile_vid_table[32] = {
2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650,
1600, 1550, 1500, 1450, 1400, 1350, 1300, 0,
1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100,
1075, 1050, 1024, 1000, 975, 950, 925, 0,
};
/* divide by 10 to get FID. */
static int fid_codes[32] = {
110, 115, 120, 125, 50, 55, 60, 65,
70, 75, 80, 85, 90, 95, 100, 105,
30, 190, 40, 200, 130, 135, 140, 210,
150, 225, 160, 165, 170, 180, -1, -1,
};
/* This parameter is used in order to force ACPI instead of legacy method for
* configuration purpose.
*/
static int powernow_acpi_force;
static struct cpufreq_frequency_table *powernow_table;
static unsigned int can_scale_bus;
static unsigned int can_scale_vid;
static unsigned int minimum_speed=-1;
static unsigned int maximum_speed;
static unsigned int number_scales;
static unsigned int fsb;
static unsigned int latency;
static char have_a0;
static int check_fsb(unsigned int fsbspeed)
{
int delta;
unsigned int f = fsb / 1000;
delta = (fsbspeed > f) ? fsbspeed - f : f - fsbspeed;
return (delta < 5);
}
static int check_powernow(void)
{
struct cpuinfo_x86 *c = cpu_data;
unsigned int maxei, eax, ebx, ecx, edx;
if ((c->x86_vendor != X86_VENDOR_AMD) || (c->x86 !=6)) {
#ifdef MODULE
printk (KERN_INFO PFX "This module only works with AMD K7
CPUs\n");
#endif
return 0;
}
/* Get maximum capabilities */
maxei = cpuid_eax (0x80000000);
if (maxei < 0x80000007) { /* Any powernow info ? */
#ifdef MODULE
printk (KERN_INFO PFX "No powernow capabilities detected\n");
#endif
return 0;
}
if ((c->x86_model == 6) && (c->x86_mask == 0)) {
printk (KERN_INFO PFX "K7 660[A0] core detected, enabling
errata workarounds\n");
have_a0 = 1;
}
cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
printk (KERN_INFO PFX "PowerNOW! Technology present. Can scale: ");
if (edx & 1 << 1) {
printk ("frequency");
can_scale_bus=1;
}
if ((edx & (1 << 1 | 1 << 2)) == 0x6)
printk (" and ");
if (edx & 1 << 2) {
printk ("voltage");
can_scale_vid=1;
}
if (!(edx & (1 << 1 | 1 << 2))) {
printk ("nothing.\n");
return 0;
}
printk (".\n");
return 1;
}
static int get_ranges (unsigned char *pst)
{
unsigned int j;
unsigned int speed;
u8 fid, vid;
powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table) *
(number_scales + 1)), GFP_KERNEL);
if (!powernow_table)
return -ENOMEM;
memset(powernow_table, 0, (sizeof(struct cpufreq_frequency_table) *
(number_scales + 1)));
for (j=0 ; j < number_scales; j++) {
fid = *pst++;
powernow_table[j].frequency = (fsb * fid_codes[fid]) / 10;
powernow_table[j].index = fid; /* lower 8 bits */
speed = powernow_table[j].frequency;
if ((fid_codes[fid] % 10)==5) {
#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
if (have_a0 == 1)
powernow_table[j].frequency =
CPUFREQ_ENTRY_INVALID;
#endif
}
dprintk (KERN_INFO PFX " FID: 0x%x (%d.%dx [%dMHz])\t", fid,
fid_codes[fid] / 10, fid_codes[fid] % 10, speed/1000);
if (speed < minimum_speed)
minimum_speed = speed;
if (speed > maximum_speed)
maximum_speed = speed;
vid = *pst++;
powernow_table[j].index |= (vid << 8); /* upper 8 bits */
dprintk ("VID: 0x%x (%d.%03dV)\n", vid,
mobile_vid_table[vid]/1000,
mobile_vid_table[vid]%1000);
}
powernow_table[number_scales].frequency = CPUFREQ_TABLE_END;
powernow_table[number_scales].index = 0;
return 0;
}
static void change_FID(int fid)
{
union msr_fidvidctl fidvidctl;
rdmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val);
if (fidvidctl.bits.FID != fid) {
fidvidctl.bits.SGTC = latency;
fidvidctl.bits.FID = fid;
fidvidctl.bits.VIDC = 0;
fidvidctl.bits.FIDC = 1;
wrmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val);
}
}
static void change_VID(int vid)
{
union msr_fidvidctl fidvidctl;
rdmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val);
if (fidvidctl.bits.VID != vid) {
fidvidctl.bits.SGTC = latency;
fidvidctl.bits.VID = vid;
fidvidctl.bits.FIDC = 0;
fidvidctl.bits.VIDC = 1;
wrmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val);
}
}
static void change_speed (unsigned int index)
{
u8 fid, vid;
struct cpufreq_freqs freqs;
union msr_fidvidstatus fidvidstatus;
int cfid;
/* fid are the lower 8 bits of the index we stored into
* the cpufreq frequency table in powernow_decode_bios,
* vid are the upper 8 bits.
*/
fid = powernow_table[index].index & 0xFF;
vid = (powernow_table[index].index & 0xFF00) >> 8;
freqs.cpu = 0;
rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val);
cfid = fidvidstatus.bits.CFID;
freqs.old = fsb * fid_codes[cfid] / 10;
freqs.new = powernow_table[index].frequency;
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
/* Now do the magic poking into the MSRs. */
if (have_a0 == 1) /* A0 errata 5 */
local_irq_disable();
if (freqs.old > freqs.new) {
/* Going down, so change FID first */
change_FID(fid);
change_VID(vid);
} else {
/* Going up, so change VID first */
change_VID(vid);
change_FID(fid);
}
if (have_a0 == 1)
local_irq_enable();
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
}
#ifdef CONFIG_ACPI_PROCESSOR
struct acpi_processor_performance *acpi_processor_perf;
static int powernow_acpi_init(void)
{
int i;
int retval = 0;
union powernow_acpi_control_t pc;
if (acpi_processor_perf != NULL && powernow_table != NULL) {
retval = -EINVAL;
goto err0;
}
acpi_processor_perf = kmalloc(sizeof(struct acpi_processor_performance),
GFP_KERNEL);
if (!acpi_processor_perf) {
retval = -ENOMEM;
goto err0;
}
memset(acpi_processor_perf, 0, sizeof(struct
acpi_processor_performance));
if (acpi_processor_register_performance(acpi_processor_perf, 0)) {
retval = -EIO;
goto err1;
}
if (acpi_processor_perf->control_register.space_id !=
ACPI_ADR_SPACE_FIXED_HARDWARE) {
retval = -ENODEV;
goto err2;
}
if (acpi_processor_perf->status_register.space_id !=
ACPI_ADR_SPACE_FIXED_HARDWARE) {
retval = -ENODEV;
goto err2;
}
number_scales = acpi_processor_perf->state_count;
if (number_scales < 2) {
retval = -ENODEV;
goto err2;
}
powernow_table = kmalloc((number_scales + 1) * (sizeof(struct
cpufreq_frequency_table)), GFP_KERNEL);
if (!powernow_table) {
retval = -ENOMEM;
goto err2;
}
memset(powernow_table, 0, ((number_scales + 1) * sizeof(struct
cpufreq_frequency_table)));
pc.val = (unsigned long) acpi_processor_perf->states[0].control;
for (i = 0; i < number_scales; i++) {
u8 fid, vid;
unsigned int speed;
pc.val = (unsigned long) acpi_processor_perf->states[i].control;
dprintk (KERN_INFO PFX "acpi: P%d: %d MHz %d mW %d uS control
%08x SGTC %d\n",
i,
(u32) acpi_processor_perf->states[i].core_frequency,
(u32) acpi_processor_perf->states[i].power,
(u32)
acpi_processor_perf->states[i].transition_latency,
(u32) acpi_processor_perf->states[i].control,
pc.bits.sgtc);
vid = pc.bits.vid;
fid = pc.bits.fid;
powernow_table[i].frequency = fsb * fid_codes[fid] / 10;
powernow_table[i].index = fid; /* lower 8 bits */
powernow_table[i].index |= (vid << 8); /* upper 8 bits */
speed = powernow_table[i].frequency;
if ((fid_codes[fid] % 10)==5) {
if (have_a0 == 1)
powernow_table[i].frequency =
CPUFREQ_ENTRY_INVALID;
}
dprintk (KERN_INFO PFX " FID: 0x%x (%d.%dx [%dMHz])\t", fid,
fid_codes[fid] / 10, fid_codes[fid] % 10, speed/1000);
dprintk ("VID: 0x%x (%d.%03dV)\n", vid,
mobile_vid_table[vid]/1000,
mobile_vid_table[vid]%1000);
if (latency < pc.bits.sgtc)
latency = pc.bits.sgtc;
if (speed < minimum_speed)
minimum_speed = speed;
if (speed > maximum_speed)
maximum_speed = speed;
}
powernow_table[i].frequency = CPUFREQ_TABLE_END;
powernow_table[i].index = 0;
return 0;
err2:
acpi_processor_unregister_performance(acpi_processor_perf, 0);
err1:
kfree(acpi_processor_perf);
err0:
printk(KERN_WARNING PFX "ACPI perflib can not be used in this
platform\n");
acpi_processor_perf = NULL;
return retval;
}
#else
static int powernow_acpi_init(void)
{
printk(KERN_INFO PFX "no support for ACPI processor found."
" Please recompile your kernel with ACPI processor\n");
return -EINVAL;
}
#endif
static int powernow_decode_bios (int maxfid, int startvid)
{
struct psb_s *psb;
struct pst_s *pst;
unsigned int i, j;
unsigned char *p;
unsigned int etuple;
unsigned int ret;
etuple = cpuid_eax(0x80000001);
for (i=0xC0000; i < 0xffff0 ; i+=16) {
p = phys_to_virt(i);
if (memcmp(p, "AMDK7PNOW!", 10) == 0){
dprintk (KERN_INFO PFX "Found PSB header at %p\n", p);
psb = (struct psb_s *) p;
dprintk (KERN_INFO PFX "Table version: 0x%x\n",
psb->tableversion);
if (psb->tableversion != 0x12) {
printk (KERN_INFO PFX "Sorry, only v1.2 tables
supported right now\n");
return -ENODEV;
}
dprintk (KERN_INFO PFX "Flags: 0x%x (", psb->flags);
if ((psb->flags & 1)==0) {
dprintk ("Mobile");
} else {
dprintk ("Desktop");
}
dprintk (" voltage regulator)\n");
latency = psb->settlingtime;
if (latency < 100) {
printk (KERN_INFO PFX "BIOS set settling time
to %d microseconds."
"Should be at least 100.
Correcting.\n", latency);
latency = 100;
}
dprintk (KERN_INFO PFX "Settling Time: %d
microseconds.\n", psb->settlingtime);
dprintk (KERN_INFO PFX "Has %d PST tables. (Only
dumping ones relevant to this CPU).\n", psb->numpst);
p += sizeof (struct psb_s);
pst = (struct pst_s *) p;
for (i = 0 ; i <psb->numpst; i++) {
pst = (struct pst_s *) p;
number_scales = pst->numpstates;
if ((etuple == pst->cpuid) &&
check_fsb(pst->fsbspeed) &&
(maxfid==pst->maxfid) &&
(startvid==pst->startvid))
{
dprintk (KERN_INFO PFX "PST:%d
(@%p)\n", i, pst);
dprintk (KERN_INFO PFX " cpuid:
0x%x\t", pst->cpuid);
dprintk ("fsb: %d\t", pst->fsbspeed);
dprintk ("maxFID: 0x%x\t", pst->maxfid);
dprintk ("startvid: 0x%x\n",
pst->startvid);
ret = get_ranges ((char *) pst + sizeof
(struct pst_s));
return ret;
} else {
p = (char *) pst + sizeof (struct
pst_s);
for (j=0 ; j < number_scales; j++)
p+=2;
}
}
printk (KERN_INFO PFX "No PST tables match this cpuid
(0x%x)\n", etuple);
printk (KERN_INFO PFX "This is indicative of a broken
BIOS.\n");
return -EINVAL;
}
p++;
}
return -ENODEV;
}
static int powernow_target (struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
{
unsigned int newstate;
if (cpufreq_frequency_table_target(policy, powernow_table, target_freq,
relation, &newstate))
return -EINVAL;
change_speed(newstate);
return 0;
}
static int powernow_verify (struct cpufreq_policy *policy)
{
return cpufreq_frequency_table_verify(policy, powernow_table);
}
/*
* We use the fact that the bus frequency is somehow
* a multiple of 100000/3 khz, then we compute sgtc according
* to this multiple.
* That way, we match more how AMD thinks all of that work.
* We will then get the same kind of behaviour already tested under
* the "well-known" other OS.
*/
static int __init fixup_sgtc(void)
{
unsigned int sgtc;
unsigned int m;
m = fsb / 3333;
if ((m % 10) >= 5)
m += 5;
m /= 10;
sgtc = 100 * m * latency;
sgtc = sgtc / 3;
if (sgtc > 0xfffff) {
printk(KERN_WARNING PFX "SGTC too large %d\n", sgtc);
sgtc = 0xfffff;
}
return sgtc;
}
static int __init powernow_cpu_init (struct cpufreq_policy *policy)
{
union msr_fidvidstatus fidvidstatus;
int result;
if (policy->cpu != 0)
return -ENODEV;
rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val);
/* A K7 with powernow technology is set to max frequency by BIOS */
fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID];
if (!fsb) {
printk(KERN_WARNING PFX "can not determine bus frequency\n");
return -EINVAL;
}
dprintk(KERN_INFO PFX "FSB: %3d.%03d MHz\n", fsb/1000, fsb%1000);
if ((dmi_broken & BROKEN_CPUFREQ) || powernow_acpi_force) {
printk (KERN_INFO PFX "PSB/PST known to be broken. Trying ACPI
instead\n");
result = powernow_acpi_init();
} else {
result = powernow_decode_bios(fidvidstatus.bits.MFID,
fidvidstatus.bits.SVID);
if (result) {
printk (KERN_INFO PFX "Trying ACPI perflib\n");
maximum_speed = 0;
minimum_speed = -1;
latency = 0;
result = powernow_acpi_init();
if (result) {
printk (KERN_INFO PFX "ACPI and legacy methods
failed\n");
printk (KERN_INFO PFX "See
http://www.codemonkey.org.uk/projects/cpufreq/powernow-k7.shtml\n";);
}
} else {
/* SGTC use the bus clock as timer */
latency = fixup_sgtc();
printk(KERN_INFO PFX "SGTC: %d\n", latency);
}
}
if (result)
return result;
printk (KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz.\n",
minimum_speed/1000, maximum_speed/1000);
policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
policy->cpuinfo.transition_latency = 20 * latency / fsb;
policy->cur = maximum_speed;
cpufreq_frequency_table_get_attr(powernow_table, policy->cpu);
return cpufreq_frequency_table_cpuinfo(policy, powernow_table);
}
static int powernow_cpu_exit (struct cpufreq_policy *policy) {
cpufreq_frequency_table_put_attr(policy->cpu);
return 0;
}
static struct freq_attr* powernow_table_attr[] = {
&cpufreq_freq_attr_scaling_available_freqs,
NULL,
};
static struct cpufreq_driver powernow_driver = {
.verify = powernow_verify,
.target = powernow_target,
.init = powernow_cpu_init,
.exit = powernow_cpu_exit,
.name = "powernow-k7",
.owner = THIS_MODULE,
.attr = powernow_table_attr,
};
static int __init powernow_init (void)
{
if (check_powernow()==0)
return -ENODEV;
return cpufreq_register_driver(&powernow_driver);
}
static void __exit powernow_exit (void)
{
#ifdef CONFIG_ACPI_PROCESSOR
if (acpi_processor_perf) {
acpi_processor_unregister_performance(acpi_processor_perf, 0);
kfree(acpi_processor_perf);
}
#endif
cpufreq_unregister_driver(&powernow_driver);
if (powernow_table)
kfree(powernow_table);
}
module_param(powernow_acpi_force, int, 0444);
MODULE_PARM_DESC(acpi_force, "Force ACPI to be used");
MODULE_AUTHOR ("Dave Jones <davej@xxxxxxxxxxxxxxxxx>");
MODULE_DESCRIPTION ("Powernow driver for AMD K7 processors.");
MODULE_LICENSE ("GPL");
late_initcall(powernow_init);
module_exit(powernow_exit);
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