d4019f0a92
Most of the drivers do following in their ->target_index() routines: struct cpufreq_freqs freqs; freqs.old = old freq... freqs.new = new freq... cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE); /* Change rate here */ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE); This is replicated over all cpufreq drivers today and there doesn't exists a good enough reason why this shouldn't be moved to cpufreq core instead. There are few special cases though, like exynos5440, which doesn't do everything on the call to ->target_index() routine and call some kind of bottom halves for doing this work, work/tasklet/etc.. They may continue doing notification from their own code as flag: CPUFREQ_ASYNC_NOTIFICATION is already set for them. All drivers are also modified in this patch to avoid breaking 'git bisect', as double notification would happen otherwise. Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Russell King <linux@arm.linux.org.uk> Acked-by: Stephen Warren <swarren@nvidia.com> Tested-by: Andrew Lunn <andrew@lunn.ch> Tested-by: Nicolas Pitre <nicolas.pitre@linaro.org> Reviewed-by: Lan Tianyu <tianyu.lan@intel.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
101 lines
2.6 KiB
C
101 lines
2.6 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/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 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 unsigned int dbx500_cpufreq_getspeed(unsigned int cpu)
|
|
{
|
|
int i = 0;
|
|
unsigned long freq = clk_get_rate(armss_clk) / 1000;
|
|
|
|
/* The value is rounded to closest frequency in the defined table. */
|
|
while (freq_table[i + 1].frequency != CPUFREQ_TABLE_END) {
|
|
if (freq < freq_table[i].frequency +
|
|
(freq_table[i + 1].frequency - freq_table[i].frequency) / 2)
|
|
return freq_table[i].frequency;
|
|
i++;
|
|
}
|
|
|
|
return freq_table[i].frequency;
|
|
}
|
|
|
|
static int dbx500_cpufreq_init(struct cpufreq_policy *policy)
|
|
{
|
|
return cpufreq_generic_init(policy, freq_table, 20 * 1000);
|
|
}
|
|
|
|
static struct cpufreq_driver dbx500_cpufreq_driver = {
|
|
.flags = CPUFREQ_STICKY | CPUFREQ_CONST_LOOPS,
|
|
.verify = cpufreq_generic_frequency_table_verify,
|
|
.target_index = dbx500_cpufreq_target,
|
|
.get = dbx500_cpufreq_getspeed,
|
|
.init = dbx500_cpufreq_init,
|
|
.name = "DBX500",
|
|
.attr = cpufreq_generic_attr,
|
|
};
|
|
|
|
static int dbx500_cpufreq_probe(struct platform_device *pdev)
|
|
{
|
|
int i = 0;
|
|
|
|
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");
|
|
while (freq_table[i].frequency != CPUFREQ_TABLE_END) {
|
|
pr_info(" %d Mhz\n", freq_table[i].frequency/1000);
|
|
i++;
|
|
}
|
|
|
|
return cpufreq_register_driver(&dbx500_cpufreq_driver);
|
|
}
|
|
|
|
static struct platform_driver dbx500_cpufreq_plat_driver = {
|
|
.driver = {
|
|
.name = "cpufreq-ux500",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.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");
|