Commit 3f669609 authored by Dave Jones's avatar Dave Jones

[CPUFREQ] Add powernow-k7 driver for AMD mobile Athlon/Duron CPUs.

parent 7f939798
......@@ -1005,6 +1005,16 @@ config X86_POWERNOW_K6
If in doubt, say N.
config X86_POWERNOW_K7
tristate "AMD Mobile Athlon/Duron PowerNow!"
depends on CPU_FREQ
help
This adds the CPUFreq driver for mobile AMD K7 mobile processors.
For details, take a look at linux/Documentation/cpufreq.
If in doubt, say N.
config ELAN_CPUFREQ
tristate "AMD Elan"
depends on CPU_FREQ && MELAN
......
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
......
/*
* $Id: powernow-k7.c,v 1.31 2003/02/12 21:16:35 davej Exp $
*
* (C) 2003 Dave Jones <davej@suse.de>
*
* 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/kernel.h>
#include <linux/module.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 "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;
};
/* 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, 10, 105,
30, 190, 40, 200, 130, 135, 140, 210,
150, 225, 160, 165, 170, 180, -1, -1,
};
static struct cpufreq_driver powernow_driver;
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;
#ifndef rdmsrl
#define rdmsrl(msr,val) do {unsigned long l__,h__; \
rdmsr (msr, l__, h__); \
val = l__; \
val |= ((u64)h__<<32); \
} while(0);
#endif
#ifndef wrmsrl
static void wrmsrl (u32 msr, u64 val)
{
u32 lo, hi;
lo = (u32) val;
hi = val >> 32;
wrmsr (msr, lo, hi);
}
#endif
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) {
printk (KERN_INFO PFX "AMD processor not detected.\n");
return 0;
}
if (c->x86 !=6) {
printk (KERN_INFO PFX "This module only works with AMD K7 CPUs\n");
return 0;
}
printk (KERN_INFO PFX "AMD K7 CPU detected.\n");
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;
}
/* Get maximum capabilities */
maxei = cpuid_eax (0x80000000);
if (maxei < 0x80000007) { /* Any powernow info ? */
printk (KERN_INFO PFX "No powernow capabilities detected\n");
return 0;
}
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)
{
int j;
u8 fid, vid;
unsigned int speed;
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] * 100;
powernow_table[j].index = fid; /* lower 8 bits */
speed = fsb * (fid_codes[fid]/10);
if ((fid_codes[fid] % 10)==5) {
speed += fsb/2;
#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);
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.%dV)\n", vid, mobile_vid_table[vid]/1000,
mobile_vid_table[vid]%1000);
}
dprintk ("\n");
powernow_table[number_scales].frequency = CPUFREQ_TABLE_END;
powernow_table[number_scales].index = 0;
return 0;
}
static void change_speed (unsigned int index)
{
u8 fid, vid;
struct cpufreq_freqs freqs;
union msr_fidvidstatus fidvidstatus;
union msr_fidvidctl fidvidctl;
/* 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);
freqs.old = fsb * fid_codes[fidvidstatus.bits.CFID] * 100;
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 */
__asm__("\tcli\n");
rdmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val);
fidvidctl.bits.SGTC = latency; /* Stop grant timeout counter */
fidvidctl.bits.FID = fid;
fidvidctl.bits.VID = vid;
/* Note, we could set these lazily. Ie, only do voltage transition
if its changed since last time (Some speeds have the same voltage) */
fidvidctl.bits.FIDC = 1;
fidvidctl.bits.VIDC = 1;
wrmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val);
if (have_a0 == 1)
__asm__("\tsti\n");
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
}
int powernow_decode_bios (int maxfid, int startvid)
{
struct psb_s *psb;
struct pst_s *pst;
struct cpuinfo_x86 *c = cpu_data;
unsigned int i, j;
unsigned char *p;
unsigned int etuple;
unsigned int ret;
etuple = cpuid_eax(0x80000001);
etuple &= 0xf00;
etuple |= (c->x86_model<<4)|(c->x86_mask);
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;
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) && (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);
fsb = pst->fsbspeed;
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;
}
}
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);
}
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);
result = powernow_decode_bios(fidvidstatus.bits.MFID, fidvidstatus.bits.SVID);
if (result)
return result;
printk (KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz.\n",
minimum_speed, maximum_speed);
policy->policy = CPUFREQ_POLICY_PERFORMANCE;
policy->cpuinfo.transition_latency = latency;
#ifdef CONFIG_CPU_FREQ_24_API
powernow_driver.cpu_cur_freq[policy->cpu] = maximum_speed;
#endif
return cpufreq_frequency_table_cpuinfo(policy, powernow_table);
}
static int __init powernow_init (void)
{
if (check_powernow()==0)
return -ENODEV;
return cpufreq_register_driver(&powernow_driver);
}
static void __exit powernow_exit (void)
{
cpufreq_unregister_driver(&powernow_driver);
if (powernow_table)
kfree(powernow_table);
}
static struct cpufreq_driver powernow_driver = {
.verify = powernow_verify,
.target = powernow_target,
.init = powernow_cpu_init,
.name = "powernow-k7",
};
MODULE_AUTHOR ("Dave Jones <davej@suse.de>");
MODULE_DESCRIPTION ("Powernow driver for AMD K7 processors.");
MODULE_LICENSE ("GPL");
module_init(powernow_init);
module_exit(powernow_exit);
/*
* $Id: powernow-k7.h,v 1.2 2003/02/10 18:26:01 davej Exp $
* (C) 2003 Dave Jones.
*
* Licensed under the terms of the GNU GPL License version 2.
*
* AMD-specific information
*
*/
#ifndef MSR_K7_FID_VID_CTL
#define MSR_K7_FID_VID_CTL 0xc0010041
#endif
#ifndef MSR_K7_FID_VID_STATUS
#define MSR_K7_FID_VID_STATUS 0xc0010042
#endif
union msr_fidvidctl {
struct {
unsigned FID:5, // 4:0
reserved1:3, // 7:5
VID:5, // 12:8
reserved2:3, // 15:13
FIDC:1, // 16
VIDC:1, // 17
reserved3:2, // 19:18
FIDCHGRATIO:1, // 20
reserved4:11, // 31-21
SGTC:20, // 32:51
reserved5:12; // 63:52
} bits;
unsigned long long val;
};
union msr_fidvidstatus {
struct {
unsigned CFID:5, // 4:0
reserved1:3, // 7:5
SFID:5, // 12:8
reserved2:3, // 15:13
MFID:5, // 20:16
reserved3:11, // 31:21
CVID:5, // 36:32
reserved4:3, // 39:37
SVID:5, // 44:40
reserved5:3, // 47:45
MVID:5, // 52:48
reserved6:11; // 63:53
} bits;
unsigned long long val;
};
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