313 lines
8.1 KiB
C
313 lines
8.1 KiB
C
/*
|
|
* This file was based upon code in Powertweak Linux (http://powertweak.sf.net)
|
|
* (C) 2000-2003 Dave Jones, Arjan van de Ven, Janne Pänkälä,
|
|
* Dominik Brodowski.
|
|
*
|
|
* Licensed under the terms of the GNU GPL License version 2.
|
|
*
|
|
* BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/cpufreq.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/timex.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <asm/cpu_device_id.h>
|
|
#include <asm/msr.h>
|
|
|
|
#define POWERNOW_IOPORT 0xfff0 /* it doesn't matter where, as long
|
|
as it is unused */
|
|
|
|
static unsigned int busfreq; /* FSB, in 10 kHz */
|
|
static unsigned int max_multiplier;
|
|
|
|
static unsigned int param_busfreq = 0;
|
|
static unsigned int param_max_multiplier = 0;
|
|
|
|
module_param_named(max_multiplier, param_max_multiplier, uint, S_IRUGO);
|
|
MODULE_PARM_DESC(max_multiplier, "Maximum multiplier (allowed values: 20 30 35 40 45 50 55 60)");
|
|
|
|
module_param_named(bus_frequency, param_busfreq, uint, S_IRUGO);
|
|
MODULE_PARM_DESC(bus_frequency, "Bus frequency in kHz");
|
|
|
|
/* Clock ratio multiplied by 10 - see table 27 in AMD#23446 */
|
|
static struct cpufreq_frequency_table clock_ratio[] = {
|
|
{0, 60, /* 110 -> 6.0x */ 0},
|
|
{0, 55, /* 011 -> 5.5x */ 0},
|
|
{0, 50, /* 001 -> 5.0x */ 0},
|
|
{0, 45, /* 000 -> 4.5x */ 0},
|
|
{0, 40, /* 010 -> 4.0x */ 0},
|
|
{0, 35, /* 111 -> 3.5x */ 0},
|
|
{0, 30, /* 101 -> 3.0x */ 0},
|
|
{0, 20, /* 100 -> 2.0x */ 0},
|
|
{0, 0, CPUFREQ_TABLE_END}
|
|
};
|
|
|
|
static const u8 index_to_register[8] = { 6, 3, 1, 0, 2, 7, 5, 4 };
|
|
static const u8 register_to_index[8] = { 3, 2, 4, 1, 7, 6, 0, 5 };
|
|
|
|
static const struct {
|
|
unsigned freq;
|
|
unsigned mult;
|
|
} usual_frequency_table[] = {
|
|
{ 350000, 35 }, // 100 * 3.5
|
|
{ 400000, 40 }, // 100 * 4
|
|
{ 450000, 45 }, // 100 * 4.5
|
|
{ 475000, 50 }, // 95 * 5
|
|
{ 500000, 50 }, // 100 * 5
|
|
{ 506250, 45 }, // 112.5 * 4.5
|
|
{ 533500, 55 }, // 97 * 5.5
|
|
{ 550000, 55 }, // 100 * 5.5
|
|
{ 562500, 50 }, // 112.5 * 5
|
|
{ 570000, 60 }, // 95 * 6
|
|
{ 600000, 60 }, // 100 * 6
|
|
{ 618750, 55 }, // 112.5 * 5.5
|
|
{ 660000, 55 }, // 120 * 5.5
|
|
{ 675000, 60 }, // 112.5 * 6
|
|
{ 720000, 60 }, // 120 * 6
|
|
};
|
|
|
|
#define FREQ_RANGE 3000
|
|
|
|
/**
|
|
* powernow_k6_get_cpu_multiplier - returns the current FSB multiplier
|
|
*
|
|
* Returns the current setting of the frequency multiplier. Core clock
|
|
* speed is frequency of the Front-Side Bus multiplied with this value.
|
|
*/
|
|
static int powernow_k6_get_cpu_multiplier(void)
|
|
{
|
|
unsigned long invalue = 0;
|
|
u32 msrval;
|
|
|
|
local_irq_disable();
|
|
|
|
msrval = POWERNOW_IOPORT + 0x1;
|
|
wrmsr(MSR_K6_EPMR, msrval, 0); /* enable the PowerNow port */
|
|
invalue = inl(POWERNOW_IOPORT + 0x8);
|
|
msrval = POWERNOW_IOPORT + 0x0;
|
|
wrmsr(MSR_K6_EPMR, msrval, 0); /* disable it again */
|
|
|
|
local_irq_enable();
|
|
|
|
return clock_ratio[register_to_index[(invalue >> 5)&7]].driver_data;
|
|
}
|
|
|
|
static void powernow_k6_set_cpu_multiplier(unsigned int best_i)
|
|
{
|
|
unsigned long outvalue, invalue;
|
|
unsigned long msrval;
|
|
unsigned long cr0;
|
|
|
|
/* we now need to transform best_i to the BVC format, see AMD#23446 */
|
|
|
|
/*
|
|
* The processor doesn't respond to inquiry cycles while changing the
|
|
* frequency, so we must disable cache.
|
|
*/
|
|
local_irq_disable();
|
|
cr0 = read_cr0();
|
|
write_cr0(cr0 | X86_CR0_CD);
|
|
wbinvd();
|
|
|
|
outvalue = (1<<12) | (1<<10) | (1<<9) | (index_to_register[best_i]<<5);
|
|
|
|
msrval = POWERNOW_IOPORT + 0x1;
|
|
wrmsr(MSR_K6_EPMR, msrval, 0); /* enable the PowerNow port */
|
|
invalue = inl(POWERNOW_IOPORT + 0x8);
|
|
invalue = invalue & 0x1f;
|
|
outvalue = outvalue | invalue;
|
|
outl(outvalue, (POWERNOW_IOPORT + 0x8));
|
|
msrval = POWERNOW_IOPORT + 0x0;
|
|
wrmsr(MSR_K6_EPMR, msrval, 0); /* disable it again */
|
|
|
|
write_cr0(cr0);
|
|
local_irq_enable();
|
|
}
|
|
|
|
/**
|
|
* powernow_k6_target - set the PowerNow! multiplier
|
|
* @best_i: clock_ratio[best_i] is the target multiplier
|
|
*
|
|
* Tries to change the PowerNow! multiplier
|
|
*/
|
|
static int powernow_k6_target(struct cpufreq_policy *policy,
|
|
unsigned int best_i)
|
|
{
|
|
|
|
if (clock_ratio[best_i].driver_data > max_multiplier) {
|
|
pr_err("invalid target frequency\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
powernow_k6_set_cpu_multiplier(best_i);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int powernow_k6_cpu_init(struct cpufreq_policy *policy)
|
|
{
|
|
struct cpufreq_frequency_table *pos;
|
|
unsigned int i, f;
|
|
unsigned khz;
|
|
|
|
if (policy->cpu != 0)
|
|
return -ENODEV;
|
|
|
|
max_multiplier = 0;
|
|
khz = cpu_khz;
|
|
for (i = 0; i < ARRAY_SIZE(usual_frequency_table); i++) {
|
|
if (khz >= usual_frequency_table[i].freq - FREQ_RANGE &&
|
|
khz <= usual_frequency_table[i].freq + FREQ_RANGE) {
|
|
khz = usual_frequency_table[i].freq;
|
|
max_multiplier = usual_frequency_table[i].mult;
|
|
break;
|
|
}
|
|
}
|
|
if (param_max_multiplier) {
|
|
cpufreq_for_each_entry(pos, clock_ratio)
|
|
if (pos->driver_data == param_max_multiplier) {
|
|
max_multiplier = param_max_multiplier;
|
|
goto have_max_multiplier;
|
|
}
|
|
pr_err("invalid max_multiplier parameter, valid parameters 20, 30, 35, 40, 45, 50, 55, 60\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!max_multiplier) {
|
|
pr_warn("unknown frequency %u, cannot determine current multiplier\n",
|
|
khz);
|
|
pr_warn("use module parameters max_multiplier and bus_frequency\n");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
have_max_multiplier:
|
|
param_max_multiplier = max_multiplier;
|
|
|
|
if (param_busfreq) {
|
|
if (param_busfreq >= 50000 && param_busfreq <= 150000) {
|
|
busfreq = param_busfreq / 10;
|
|
goto have_busfreq;
|
|
}
|
|
pr_err("invalid bus_frequency parameter, allowed range 50000 - 150000 kHz\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
busfreq = khz / max_multiplier;
|
|
have_busfreq:
|
|
param_busfreq = busfreq * 10;
|
|
|
|
/* table init */
|
|
cpufreq_for_each_entry(pos, clock_ratio) {
|
|
f = pos->driver_data;
|
|
if (f > max_multiplier)
|
|
pos->frequency = CPUFREQ_ENTRY_INVALID;
|
|
else
|
|
pos->frequency = busfreq * f;
|
|
}
|
|
|
|
/* cpuinfo and default policy values */
|
|
policy->cpuinfo.transition_latency = 500000;
|
|
policy->freq_table = clock_ratio;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int powernow_k6_cpu_exit(struct cpufreq_policy *policy)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; (clock_ratio[i].frequency != CPUFREQ_TABLE_END); i++) {
|
|
if (clock_ratio[i].driver_data == max_multiplier) {
|
|
struct cpufreq_freqs freqs;
|
|
|
|
freqs.old = policy->cur;
|
|
freqs.new = clock_ratio[i].frequency;
|
|
freqs.flags = 0;
|
|
|
|
cpufreq_freq_transition_begin(policy, &freqs);
|
|
powernow_k6_target(policy, i);
|
|
cpufreq_freq_transition_end(policy, &freqs, 0);
|
|
break;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int powernow_k6_get(unsigned int cpu)
|
|
{
|
|
unsigned int ret;
|
|
ret = (busfreq * powernow_k6_get_cpu_multiplier());
|
|
return ret;
|
|
}
|
|
|
|
static struct cpufreq_driver powernow_k6_driver = {
|
|
.verify = cpufreq_generic_frequency_table_verify,
|
|
.target_index = powernow_k6_target,
|
|
.init = powernow_k6_cpu_init,
|
|
.exit = powernow_k6_cpu_exit,
|
|
.get = powernow_k6_get,
|
|
.name = "powernow-k6",
|
|
.attr = cpufreq_generic_attr,
|
|
};
|
|
|
|
static const struct x86_cpu_id powernow_k6_ids[] = {
|
|
{ X86_VENDOR_AMD, 5, 12 },
|
|
{ X86_VENDOR_AMD, 5, 13 },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(x86cpu, powernow_k6_ids);
|
|
|
|
/**
|
|
* powernow_k6_init - initializes the k6 PowerNow! CPUFreq driver
|
|
*
|
|
* Initializes the K6 PowerNow! support. Returns -ENODEV on unsupported
|
|
* devices, -EINVAL or -ENOMEM on problems during initiatization, and zero
|
|
* on success.
|
|
*/
|
|
static int __init powernow_k6_init(void)
|
|
{
|
|
if (!x86_match_cpu(powernow_k6_ids))
|
|
return -ENODEV;
|
|
|
|
if (!request_region(POWERNOW_IOPORT, 16, "PowerNow!")) {
|
|
pr_info("PowerNow IOPORT region already used\n");
|
|
return -EIO;
|
|
}
|
|
|
|
if (cpufreq_register_driver(&powernow_k6_driver)) {
|
|
release_region(POWERNOW_IOPORT, 16);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* powernow_k6_exit - unregisters AMD K6-2+/3+ PowerNow! support
|
|
*
|
|
* Unregisters AMD K6-2+ / K6-3+ PowerNow! support.
|
|
*/
|
|
static void __exit powernow_k6_exit(void)
|
|
{
|
|
cpufreq_unregister_driver(&powernow_k6_driver);
|
|
release_region(POWERNOW_IOPORT, 16);
|
|
}
|
|
|
|
|
|
MODULE_AUTHOR("Arjan van de Ven, Dave Jones, "
|
|
"Dominik Brodowski <linux@brodo.de>");
|
|
MODULE_DESCRIPTION("PowerNow! driver for AMD K6-2+ / K6-3+ processors.");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(powernow_k6_init);
|
|
module_exit(powernow_k6_exit);
|