cpufreq/linux/arch/i386/kernel/cpufreq speedstep-smi.c, NONE, 1.1 Kconfig, 1.8, 1.9
Update of /mnt/src/cvsroot/cpufreq/linux/arch/i386/kernel/cpufreq In directory flint:/tmp/cvs-serv21659/linux/arch/i386/kernel/cpufreq
Modified Files:
Kconfig
Added Files:
speedstep-smi.c
Log Message:
* add speedstep-smi driver (Hiroshi Miura)
* clean up speedstep-smi driver (Dominik Brodowski)
- fixes a couple of warnings
- to run as a module, we need to export ist_info. Also, only show the IST_INFO line in dmesg if speedstep_smi is enabled.
- Use a new ->resume callback in the cpufreq core.
- let's call this driver "speedstep-smi" in cpufreq_driver also
- if the smi_get_freqs call fails, fall back to the "let's try it out and see what frequency we are at" mechanism. Needed on my notebook (at least).
* update driver/cpufreq/cpufreq.c
--- NEW FILE speedstep-smi.c ---
/*
* Intel SpeedStep SMI driver.
*
* (C) 2003 Hiroshi Miura <[email protected]>
*
* Licensed under the terms of the GNU GPL License version 2. *
*/
/*********************************************************************
* SPEEDSTEP - DEFINITIONS *
*********************************************************************/
#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/ist.h>
#include "speedstep-lib.h"
/* speedstep system management interface port/command.
*
* These parameters are got from IST-SMI BIOS call.
* If user gives it, these are used.
*
*/
static int smi_port = 0;
static int smi_cmd = 0;
#define SPEEDSTEP_HIGH 0x00000000
#define SPEEDSTEP_LOW 0x00000001
/*
* There are only two frequency states for each processor. Values
* are in kHz for the time being.
*/
static struct cpufreq_frequency_table speedstep_freqs[] = {
{SPEEDSTEP_HIGH, 0},
{SPEEDSTEP_LOW, 0},
{0, CPUFREQ_TABLE_END},
};#define GET_SPEEDSTEP_OWNER 0
#define GET_SPEEDSTEP_STATE 1
#define SET_SPEEDSTEP_STATE 2
#define GET_SPEEDSTEP_FREQS 4
/* 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
/**
* speedstep_smi_ownership
*/
static int speedstep_smi_ownership (void)
{
u32 command, result, magic;
u32 function = GET_SPEEDSTEP_OWNER;
unsigned char magic_data[] = "Copyright (c) 1999 Intel Corporation";
command = (ist_info.signature & 0xffffff00) | (smi_cmd & 0xff);
magic = virt_to_phys(magic_data);
__asm__ __volatile__(
"out %%al, (%%dx)\n"
: "=D" (result)
: "a" (command), "b" (function), "c" (0), "d" (smi_port), "D" (0), "S" (magic)
);
return result;
}/**
* speedstep_smi_get_freqs - get SpeedStep preferred & current freq. *
*/
static int speedstep_smi_get_freqs (unsigned int *low, unsigned int *high)
{
u32 command, result, edi, high_mhz, low_mhz;
u32 state=0;
u32 function = GET_SPEEDSTEP_FREQS;
command = (ist_info.signature & 0xffffff00) | (smi_cmd & 0xff);
__asm__ __volatile__("movl $0, %%edi\n"
"out %%al, (%%dx)\n"
: "=a" (result), "=b" (high_mhz), "=c" (low_mhz), "=d" (state), "=D" (edi)
: "a" (command), "b" (function), "c" (state), "d" (smi_port), "S" (0)
);
*high = high_mhz * 1000;
*low = low_mhz * 1000;
return result;
} /**
* speedstep_get_state - set the SpeedStep state
* @state: processor frequency state (SPEEDSTEP_LOW or SPEEDSTEP_HIGH) *
*/
static int speedstep_get_state (void)
{
u32 function=GET_SPEEDSTEP_STATE;
u32 result, state, edi, command;
command = (ist_info.signature & 0xffffff00) | (smi_cmd & 0xff);
__asm__ __volatile__("movl $0, %%edi\n"
"out %%al, (%%dx)\n"
: "=a" (result), "=b" (state), "=D" (edi)
: "a" (command), "b" (function), "c" (0), "d" (smi_port), "S" (0)
);
return state;
}/**
* speedstep_set_state - set the SpeedStep state
* @state: new processor frequency state (SPEEDSTEP_LOW or SPEEDSTEP_HIGH) *
*/
static void speedstep_set_state (unsigned int state, unsigned int notify)
{
unsigned int old_state, result, command, new_state;
unsigned long flags;
struct cpufreq_freqs freqs;
unsigned int function=SET_SPEEDSTEP_STATE;
if (state > 0x1)
return;
old_state = speedstep_get_state();
freqs.old = speedstep_freqs[old_state].frequency;
freqs.new = speedstep_freqs[state].frequency;
freqs.cpu = 0; /* speedstep.c is UP only driver */
if (old_state == state)
return;
if (notify)
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
/* Disable IRQs */
local_irq_save(flags);
command = (ist_info.signature & 0xffffff00) | (smi_cmd & 0xff);
__asm__ __volatile__(
"movl $0, %%edi\n"
"out %%al, (%%dx)\n"
: "=b" (new_state), "=D" (result)
: "a" (command), "b" (function), "c" (state), "d" (smi_port), "S" (0)
);
/* enable IRQs */
local_irq_restore(flags);
if (new_state == state) {
dprintk(KERN_INFO "cpufreq: change to %u MHz succeded\n", (freqs.new / 1000));
} else {
printk(KERN_ERR "cpufreq: change failed\n");
}
if (notify)
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
return;
}/**
* speedstep_target - set a new CPUFreq policy
* @policy: new policy
* @target_freq: new freq
* @relation:
*
* Sets a new CPUFreq policy/freq.
*/
static int speedstep_target (struct cpufreq_policy *policy,
unsigned int target_freq, unsigned int relation)
{
unsigned int newstate = 0;
if (cpufreq_frequency_table_target(policy, &speedstep_freqs[0], target_freq, relation, &newstate))
return -EINVAL;
speedstep_set_state(newstate, 1);
return 0;
}/**
* speedstep_verify - verifies a new CPUFreq policy
* @freq: new policy
*
* Limit must be within speedstep_low_freq and speedstep_high_freq, with
* at least one border included.
*/
static int speedstep_verify (struct cpufreq_policy *policy)
{
return cpufreq_frequency_table_verify(policy, &speedstep_freqs[0]);
}static int speedstep_cpu_init(struct cpufreq_policy *policy)
{
int result;
unsigned int speed,state;
/* capability check */
if (policy->cpu != 0)
return -ENODEV;
result = speedstep_smi_ownership();
if (result)
dprintk(KERN_INFO "cpufreq: fails an aquiring ownership of a SMI interface.\n");
/* detect low and high frequency */
result = speedstep_smi_get_freqs(&speedstep_freqs[SPEEDSTEP_LOW].frequency,
&speedstep_freqs[SPEEDSTEP_HIGH].frequency);
if (result) {
/* fall back to speedstep_lib.c dection mechanism: try both states out */
unsigned int speedstep_processor = speedstep_detect_processor();
dprintk(KERN_INFO "speedstep-smi: could not detect low and high frequencies by SMI call.\n");
if (!speedstep_processor)
return -ENODEV;
result = (int) speedstep_get_freqs(speedstep_processor,
&speedstep_freqs[SPEEDSTEP_LOW].frequency,
&speedstep_freqs[SPEEDSTEP_HIGH].frequency,
&speedstep_set_state);
if (result) {
dprintk(KERN_INFO "speedstep-smi: could not detect two different speeds -- aborting.\n");
return result;
} else
dprintk(KERN_INFO "speedstep-smi: workaround worked.\n");
}
/* get current speed setting */
state = speedstep_get_state();
speed = speedstep_freqs[state].frequency;
dprintk(KERN_INFO "cpufreq: currently at %s speed setting - %i MHz\n",
(speed == speedstep_freqs[SPEEDSTEP_LOW].frequency) ? "low" : "high",
(speed / 1000));
/* cpuinfo and default policy values */
/* TBD: clean up when the new core is commited. */
policy->policy = (speed == speedstep_freqs[SPEEDSTEP_LOW].frequency) ?
CPUFREQ_POLICY_POWERSAVE : CPUFREQ_POLICY_PERFORMANCE;
policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
policy->cur = speed;
return cpufreq_frequency_table_cpuinfo(policy, &speedstep_freqs[0]);
}static int speedstep_resume(struct cpufreq_policy *policy)
{
int result = speedstep_smi_ownership();
if (result)
dprintk(KERN_INFO "cpufreq: fails an aquiring ownership of a SMI interface.\n");
return result;
}static struct cpufreq_driver speedstep_driver = {
.name = "speedstep-smi",
.verify = speedstep_verify,
.target = speedstep_target,
.init = speedstep_cpu_init,
.resume = speedstep_resume,
.owner = THIS_MODULE,
};
/**
* speedstep_init - initializes the SpeedStep CPUFreq driver *
* Initializes the SpeedStep support. Returns -ENODEV on unsupported
* BIOS, -EINVAL on problems during initiatization, and zero on
* success.
*/
static int __init speedstep_init(void)
{
/* Error if no IST-SMI BIOS or no PARM
sig= 'ISGE' aka 'Intel Speedstep Gate E' */
/* Don't understand: 0x47534943 is GSIC, meaning
* Geyserville System Interface Control perhaps. */
dprintk(KERN_INFO "speedstep-smi: IST_SMI: signature:0x%.8lx, command:0x%.8lx, event:0x%.8lx, perf_level:0x%.8lx\n",
ist_info.signature, ist_info.command, ist_info.event,ist_info.perf_level);
if ((ist_info.signature != 0x47534943) && (
(smi_port == 0) || (smi_cmd == 0)))
return -ENODEV;
/* setup smi_port from MODLULE_PARM or BIOS */
if ((smi_port > 0xff) || (smi_port < 0)) {
return -EINVAL;
} else if (smi_port == 0) {
smi_port = ist_info.command & 0xff;
}
if ((smi_cmd > 0xff) || (smi_cmd < 0)) {
return -EINVAL;
} else if (smi_cmd == 0) {
smi_cmd = (ist_info.command >> 16) & 0xff;
}
return cpufreq_register_driver(&speedstep_driver);
}/**
* speedstep_exit - unregisters SpeedStep support
*
* Unregisters SpeedStep support.
*/
static void __exit speedstep_exit(void)
{
cpufreq_unregister_driver(&speedstep_driver);
}MODULE_PARM (smi_port, "i");MODULE_PARM (smi_cmd, "i");
MODULE_AUTHOR ("Hiroshi Miura");MODULE_DESCRIPTION ("Speedstep driver for IST applet SMI interface."); MODULE_LICENSE ("GPL");
module_init(speedstep_init);module_exit(speedstep_exit);
Index: Kconfig
===================================================================
RCS file: /mnt/src/cvsroot/cpufreq/linux/arch/i386/kernel/cpufreq/Kconfig,v retrieving revision 1.8
retrieving revision 1.9
Kconfig +14 -2
@@ -125,6 +125,18 @@ If in doubt, say N. +config X86_SPEEDSTEP_SMI + tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)" + depends on CPU_FREQ + help + This adds the CPUFreq driver for certain mobile Intel Pentium III + (Coppermine), all mobile Intel Pentium III-M (Tualatin) + on systems which have an Intel 440BX/ZX/MX southbridge. + + 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
@@ -138,8 +150,8 @@ config X86_SPEEDSTEP_LIB tristate - depends on X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_PIIX4 - default X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_PIIX4 + depends on (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_PIIX4 || X86_SPEEDSTEP_SMI) + default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_PIIX4 || X86_SPEEDSTEP_SMI) config X86_P4_CLOCKMOD tristate "Intel Pentium 4 clock modulation"