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Linux/drivers/cpuidle/cpuidle-at91.c

  1 /*
  2  * based on arch/arm/mach-kirkwood/cpuidle.c
  3  *
  4  * CPU idle support for AT91 SoC
  5  *
  6  * This file is licensed under the terms of the GNU General Public
  7  * License version 2.  This program is licensed "as is" without any
  8  * warranty of any kind, whether express or implied.
  9  *
 10  * The cpu idle uses wait-for-interrupt and RAM self refresh in order
 11  * to implement two idle states -
 12  * #1 wait-for-interrupt
 13  * #2 wait-for-interrupt and RAM self refresh
 14  */
 15 
 16 #include <linux/kernel.h>
 17 #include <linux/init.h>
 18 #include <linux/platform_device.h>
 19 #include <linux/cpuidle.h>
 20 #include <linux/io.h>
 21 #include <linux/export.h>
 22 #include <asm/proc-fns.h>
 23 #include <asm/cpuidle.h>
 24 
 25 #define AT91_MAX_STATES 2
 26 
 27 static void (*at91_standby)(void);
 28 
 29 /* Actual code that puts the SoC in different idle states */
 30 static int at91_enter_idle(struct cpuidle_device *dev,
 31                         struct cpuidle_driver *drv,
 32                                int index)
 33 {
 34         at91_standby();
 35         return index;
 36 }
 37 
 38 static struct cpuidle_driver at91_idle_driver = {
 39         .name                   = "at91_idle",
 40         .owner                  = THIS_MODULE,
 41         .states[0]              = ARM_CPUIDLE_WFI_STATE,
 42         .states[1]              = {
 43                 .enter                  = at91_enter_idle,
 44                 .exit_latency           = 10,
 45                 .target_residency       = 10000,
 46                 .name                   = "RAM_SR",
 47                 .desc                   = "WFI and DDR Self Refresh",
 48         },
 49         .state_count = AT91_MAX_STATES,
 50 };
 51 
 52 /* Initialize CPU idle by registering the idle states */
 53 static int at91_cpuidle_probe(struct platform_device *dev)
 54 {
 55         at91_standby = (void *)(dev->dev.platform_data);
 56         
 57         return cpuidle_register(&at91_idle_driver, NULL);
 58 }
 59 
 60 static struct platform_driver at91_cpuidle_driver = {
 61         .driver = {
 62                 .name = "cpuidle-at91",
 63         },
 64         .probe = at91_cpuidle_probe,
 65 };
 66 
 67 module_platform_driver(at91_cpuidle_driver);
 68 

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