forked from luck/tmp_suning_uos_patched
1ce3c48e6c
As the cpuidle driver code has no more the dependency with the pm code, the 'standby' callback being passed as a parameter to the device's platform data, we can move the cpuidle driver in the drivers/cpuidle directory. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Conflicts: drivers/cpuidle/Kconfig.arm drivers/cpuidle/Makefile
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
|
|
* based on arch/arm/mach-kirkwood/cpuidle.c
|
|
*
|
|
* CPU idle support for AT91 SoC
|
|
*
|
|
* This file is licensed under the terms of the GNU General Public
|
|
* License version 2. This program is licensed "as is" without any
|
|
* warranty of any kind, whether express or implied.
|
|
*
|
|
* The cpu idle uses wait-for-interrupt and RAM self refresh in order
|
|
* to implement two idle states -
|
|
* #1 wait-for-interrupt
|
|
* #2 wait-for-interrupt and RAM self refresh
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/cpuidle.h>
|
|
#include <linux/io.h>
|
|
#include <linux/export.h>
|
|
#include <asm/proc-fns.h>
|
|
#include <asm/cpuidle.h>
|
|
|
|
#define AT91_MAX_STATES 2
|
|
|
|
static void (*at91_standby)(void);
|
|
|
|
/* Actual code that puts the SoC in different idle states */
|
|
static int at91_enter_idle(struct cpuidle_device *dev,
|
|
struct cpuidle_driver *drv,
|
|
int index)
|
|
{
|
|
at91_standby();
|
|
return index;
|
|
}
|
|
|
|
static struct cpuidle_driver at91_idle_driver = {
|
|
.name = "at91_idle",
|
|
.owner = THIS_MODULE,
|
|
.states[0] = ARM_CPUIDLE_WFI_STATE,
|
|
.states[1] = {
|
|
.enter = at91_enter_idle,
|
|
.exit_latency = 10,
|
|
.target_residency = 10000,
|
|
.flags = CPUIDLE_FLAG_TIME_VALID,
|
|
.name = "RAM_SR",
|
|
.desc = "WFI and DDR Self Refresh",
|
|
},
|
|
.state_count = AT91_MAX_STATES,
|
|
};
|
|
|
|
/* Initialize CPU idle by registering the idle states */
|
|
static int at91_cpuidle_probe(struct platform_device *dev)
|
|
{
|
|
at91_standby = (void *)(dev->dev.platform_data);
|
|
|
|
return cpuidle_register(&at91_idle_driver, NULL);
|
|
}
|
|
|
|
static struct platform_driver at91_cpuidle_driver = {
|
|
.driver = {
|
|
.name = "cpuidle-at91",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = at91_cpuidle_probe,
|
|
};
|
|
|
|
module_platform_driver(at91_cpuidle_driver);
|