forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
65 lines
1.6 KiB
65 lines
1.6 KiB
/* |
|
* 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/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, |
|
.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", |
|
}, |
|
.probe = at91_cpuidle_probe, |
|
}; |
|
builtin_platform_driver(at91_cpuidle_driver);
|
|
|