120 lines
3.2 KiB
C
120 lines
3.2 KiB
C
/* arch/arm/mach-msm/cpufreq.c
|
|
*
|
|
* MSM architecture cpufreq driver
|
|
*
|
|
* Copyright (C) 2007 Google, Inc.
|
|
* Copyright (c) 2007 QUALCOMM Incorporated
|
|
* Author: Mike A. Chan <mikechan@google.com>
|
|
*
|
|
* This software is licensed under the terms of the GNU General Public
|
|
* License version 2, as published by the Free Software Foundation, and
|
|
* may be copied, distributed, and modified under those terms.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
*/
|
|
|
|
#include <linux/cpufreq.h>
|
|
#include <linux/earlysuspend.h>
|
|
#include <linux/init.h>
|
|
#include "acpuclock.h"
|
|
|
|
#ifdef CONFIG_MSM_CPU_FREQ_SCREEN
|
|
static void msm_early_suspend(struct early_suspend *handler) {
|
|
acpuclk_set_rate(CONFIG_MSM_CPU_FREQ_SCREEN_OFF * 1000, 0);
|
|
}
|
|
|
|
static void msm_late_resume(struct early_suspend *handler) {
|
|
acpuclk_set_rate(CONFIG_MSM_CPU_FREQ_SCREEN_ON * 1000, 0);
|
|
}
|
|
|
|
static struct early_suspend msm_power_suspend = {
|
|
.suspend = msm_early_suspend,
|
|
.resume = msm_late_resume,
|
|
};
|
|
|
|
static int __init clock_late_init(void)
|
|
{
|
|
register_early_suspend(&msm_power_suspend);
|
|
return 0;
|
|
}
|
|
|
|
late_initcall(clock_late_init);
|
|
#else
|
|
|
|
static int msm_cpufreq_target(struct cpufreq_policy *policy,
|
|
unsigned int target_freq,
|
|
unsigned int relation)
|
|
{
|
|
int index;
|
|
struct cpufreq_freqs freqs;
|
|
struct cpufreq_frequency_table *table =
|
|
cpufreq_frequency_get_table(smp_processor_id());
|
|
|
|
if (cpufreq_frequency_table_target(policy, table, target_freq, relation,
|
|
&index)) {
|
|
pr_err("cpufreq: invalid target_freq: %d\n", target_freq);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (policy->cur == table[index].frequency)
|
|
return 0;
|
|
|
|
#ifdef CONFIG_CPU_FREQ_DEBUG
|
|
printk("msm_cpufreq_target %d r %d (%d-%d) selected %d\n", target_freq,
|
|
relation, policy->min, policy->max, table[index].frequency);
|
|
#endif
|
|
freqs.old = policy->cur;
|
|
freqs.new = table[index].frequency;
|
|
freqs.cpu = smp_processor_id();
|
|
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
|
|
acpuclk_set_rate(table[index].frequency * 1000, 0);
|
|
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
|
|
return 0;
|
|
}
|
|
|
|
static int msm_cpufreq_verify(struct cpufreq_policy *policy)
|
|
{
|
|
cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
|
|
policy->cpuinfo.max_freq);
|
|
return 0;
|
|
}
|
|
|
|
static int __init msm_cpufreq_init(struct cpufreq_policy *policy)
|
|
{
|
|
struct cpufreq_frequency_table *table =
|
|
cpufreq_frequency_get_table(smp_processor_id());
|
|
|
|
BUG_ON(cpufreq_frequency_table_cpuinfo(policy, table));
|
|
policy->cur = acpuclk_get_rate();
|
|
policy->cpuinfo.transition_latency =
|
|
acpuclk_get_switch_time() * NSEC_PER_USEC;
|
|
return 0;
|
|
}
|
|
|
|
static struct freq_attr *msm_cpufreq_attr[] = {
|
|
&cpufreq_freq_attr_scaling_available_freqs,
|
|
NULL,
|
|
};
|
|
|
|
static struct cpufreq_driver msm_cpufreq_driver = {
|
|
/* lps calculations are handled here. */
|
|
.flags = CPUFREQ_STICKY | CPUFREQ_CONST_LOOPS,
|
|
.init = msm_cpufreq_init,
|
|
.verify = msm_cpufreq_verify,
|
|
.target = msm_cpufreq_target,
|
|
.name = "msm",
|
|
.attr = msm_cpufreq_attr,
|
|
};
|
|
|
|
static int __init msm_cpufreq_register(void)
|
|
{
|
|
return cpufreq_register_driver(&msm_cpufreq_driver);
|
|
}
|
|
|
|
device_initcall(msm_cpufreq_register);
|
|
#endif
|