104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/*
|
|
* Copyright (C) STMicroelectronics 2009
|
|
* Copyright (C) ST-Ericsson SA 2010-2012
|
|
*
|
|
* License Terms: GNU General Public License v2
|
|
* Author: Sundar Iyer <sundar.iyer@stericsson.com>
|
|
* Author: Martin Persson <martin.persson@stericsson.com>
|
|
* Author: Jonas Aaberg <jonas.aberg@stericsson.com>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/cpufreq.h>
|
|
#include <linux/cpu_cooling.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/clk.h>
|
|
|
|
static struct cpufreq_frequency_table *freq_table;
|
|
static struct clk *armss_clk;
|
|
static struct thermal_cooling_device *cdev;
|
|
|
|
static int dbx500_cpufreq_target(struct cpufreq_policy *policy,
|
|
unsigned int index)
|
|
{
|
|
/* update armss clk frequency */
|
|
return clk_set_rate(armss_clk, freq_table[index].frequency * 1000);
|
|
}
|
|
|
|
static int dbx500_cpufreq_init(struct cpufreq_policy *policy)
|
|
{
|
|
policy->clk = armss_clk;
|
|
return cpufreq_generic_init(policy, freq_table, 20 * 1000);
|
|
}
|
|
|
|
static int dbx500_cpufreq_exit(struct cpufreq_policy *policy)
|
|
{
|
|
if (!IS_ERR(cdev))
|
|
cpufreq_cooling_unregister(cdev);
|
|
return 0;
|
|
}
|
|
|
|
static void dbx500_cpufreq_ready(struct cpufreq_policy *policy)
|
|
{
|
|
cdev = cpufreq_cooling_register(policy);
|
|
if (IS_ERR(cdev))
|
|
pr_err("Failed to register cooling device %ld\n", PTR_ERR(cdev));
|
|
else
|
|
pr_info("Cooling device registered: %s\n", cdev->type);
|
|
}
|
|
|
|
static struct cpufreq_driver dbx500_cpufreq_driver = {
|
|
.flags = CPUFREQ_STICKY | CPUFREQ_CONST_LOOPS |
|
|
CPUFREQ_NEED_INITIAL_FREQ_CHECK,
|
|
.verify = cpufreq_generic_frequency_table_verify,
|
|
.target_index = dbx500_cpufreq_target,
|
|
.get = cpufreq_generic_get,
|
|
.init = dbx500_cpufreq_init,
|
|
.exit = dbx500_cpufreq_exit,
|
|
.ready = dbx500_cpufreq_ready,
|
|
.name = "DBX500",
|
|
.attr = cpufreq_generic_attr,
|
|
};
|
|
|
|
static int dbx500_cpufreq_probe(struct platform_device *pdev)
|
|
{
|
|
struct cpufreq_frequency_table *pos;
|
|
|
|
freq_table = dev_get_platdata(&pdev->dev);
|
|
if (!freq_table) {
|
|
pr_err("dbx500-cpufreq: Failed to fetch cpufreq table\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
armss_clk = clk_get(&pdev->dev, "armss");
|
|
if (IS_ERR(armss_clk)) {
|
|
pr_err("dbx500-cpufreq: Failed to get armss clk\n");
|
|
return PTR_ERR(armss_clk);
|
|
}
|
|
|
|
pr_info("dbx500-cpufreq: Available frequencies:\n");
|
|
cpufreq_for_each_entry(pos, freq_table)
|
|
pr_info(" %d Mhz\n", pos->frequency / 1000);
|
|
|
|
return cpufreq_register_driver(&dbx500_cpufreq_driver);
|
|
}
|
|
|
|
static struct platform_driver dbx500_cpufreq_plat_driver = {
|
|
.driver = {
|
|
.name = "cpufreq-ux500",
|
|
},
|
|
.probe = dbx500_cpufreq_probe,
|
|
};
|
|
|
|
static int __init dbx500_cpufreq_register(void)
|
|
{
|
|
return platform_driver_register(&dbx500_cpufreq_plat_driver);
|
|
}
|
|
device_initcall(dbx500_cpufreq_register);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("cpufreq driver for DBX500");
|