mirror of
https://github.com/torvalds/linux.git
synced 2024-11-01 09:41:44 +00:00
adc97d6a73
We don't need to set .owner = THIS_MODULE any more in cpufreq drivers as this field isn't used any more by the cpufreq core. This patch removes it and updates all dependent drivers accordingly. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
/*
|
|
* Copyright (C) 2004-2007 Atmel Corporation
|
|
*
|
|
* Based on MIPS implementation arch/mips/kernel/time.c
|
|
* Copyright 2001 MontaVista Software Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
/*#define DEBUG*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
#include <linux/cpufreq.h>
|
|
#include <linux/io.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/err.h>
|
|
#include <linux/export.h>
|
|
|
|
static struct clk *cpuclk;
|
|
|
|
static int at32_verify_speed(struct cpufreq_policy *policy)
|
|
{
|
|
if (policy->cpu != 0)
|
|
return -EINVAL;
|
|
|
|
cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
|
|
policy->cpuinfo.max_freq);
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int at32_get_speed(unsigned int cpu)
|
|
{
|
|
/* No SMP support */
|
|
if (cpu)
|
|
return 0;
|
|
return (unsigned int)((clk_get_rate(cpuclk) + 500) / 1000);
|
|
}
|
|
|
|
static unsigned int ref_freq;
|
|
static unsigned long loops_per_jiffy_ref;
|
|
|
|
static int at32_set_target(struct cpufreq_policy *policy,
|
|
unsigned int target_freq,
|
|
unsigned int relation)
|
|
{
|
|
struct cpufreq_freqs freqs;
|
|
long freq;
|
|
|
|
/* Convert target_freq from kHz to Hz */
|
|
freq = clk_round_rate(cpuclk, target_freq * 1000);
|
|
|
|
/* Check if policy->min <= new_freq <= policy->max */
|
|
if(freq < (policy->min * 1000) || freq > (policy->max * 1000))
|
|
return -EINVAL;
|
|
|
|
pr_debug("cpufreq: requested frequency %u Hz\n", target_freq * 1000);
|
|
|
|
freqs.old = at32_get_speed(0);
|
|
freqs.new = (freq + 500) / 1000;
|
|
freqs.flags = 0;
|
|
|
|
if (!ref_freq) {
|
|
ref_freq = freqs.old;
|
|
loops_per_jiffy_ref = boot_cpu_data.loops_per_jiffy;
|
|
}
|
|
|
|
cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
|
|
if (freqs.old < freqs.new)
|
|
boot_cpu_data.loops_per_jiffy = cpufreq_scale(
|
|
loops_per_jiffy_ref, ref_freq, freqs.new);
|
|
clk_set_rate(cpuclk, freq);
|
|
if (freqs.new < freqs.old)
|
|
boot_cpu_data.loops_per_jiffy = cpufreq_scale(
|
|
loops_per_jiffy_ref, ref_freq, freqs.new);
|
|
cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
|
|
|
|
pr_debug("cpufreq: set frequency %lu Hz\n", freq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init at32_cpufreq_driver_init(struct cpufreq_policy *policy)
|
|
{
|
|
if (policy->cpu != 0)
|
|
return -EINVAL;
|
|
|
|
cpuclk = clk_get(NULL, "cpu");
|
|
if (IS_ERR(cpuclk)) {
|
|
pr_debug("cpufreq: could not get CPU clk\n");
|
|
return PTR_ERR(cpuclk);
|
|
}
|
|
|
|
policy->cpuinfo.min_freq = (clk_round_rate(cpuclk, 1) + 500) / 1000;
|
|
policy->cpuinfo.max_freq = (clk_round_rate(cpuclk, ~0UL) + 500) / 1000;
|
|
policy->cpuinfo.transition_latency = 0;
|
|
policy->cur = at32_get_speed(0);
|
|
policy->min = policy->cpuinfo.min_freq;
|
|
policy->max = policy->cpuinfo.max_freq;
|
|
|
|
printk("cpufreq: AT32AP CPU frequency driver\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct cpufreq_driver at32_driver = {
|
|
.name = "at32ap",
|
|
.init = at32_cpufreq_driver_init,
|
|
.verify = at32_verify_speed,
|
|
.target = at32_set_target,
|
|
.get = at32_get_speed,
|
|
.flags = CPUFREQ_STICKY,
|
|
};
|
|
|
|
static int __init at32_cpufreq_init(void)
|
|
{
|
|
return cpufreq_register_driver(&at32_driver);
|
|
}
|
|
late_initcall(at32_cpufreq_init);
|