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Linux/arch/arm/mach-s3c64xx/cpuidle.c

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  1 /* linux/arch/arm/mach-s3c64xx/cpuidle.c
  2  *
  3  * Copyright (c) 2011 Wolfson Microelectronics, plc
  4  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
  5  *              http://www.samsung.com
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License version 2 as
  9  * published by the Free Software Foundation.
 10 */
 11 
 12 #include <linux/kernel.h>
 13 #include <linux/init.h>
 14 #include <linux/cpuidle.h>
 15 #include <linux/io.h>
 16 #include <linux/export.h>
 17 #include <linux/time.h>
 18 
 19 #include <asm/proc-fns.h>
 20 
 21 #include <mach/map.h>
 22 
 23 #include <mach/regs-sys.h>
 24 #include <mach/regs-syscon-power.h>
 25 
 26 static int s3c64xx_enter_idle(struct cpuidle_device *dev,
 27                               struct cpuidle_driver *drv,
 28                               int index)
 29 {
 30         unsigned long tmp;
 31 
 32         /* Setup PWRCFG to enter idle mode */
 33         tmp = __raw_readl(S3C64XX_PWR_CFG);
 34         tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK;
 35         tmp |= S3C64XX_PWRCFG_CFG_WFI_IDLE;
 36         __raw_writel(tmp, S3C64XX_PWR_CFG);
 37 
 38         cpu_do_idle();
 39 
 40         return index;
 41 }
 42 
 43 static DEFINE_PER_CPU(struct cpuidle_device, s3c64xx_cpuidle_device);
 44 
 45 static struct cpuidle_driver s3c64xx_cpuidle_driver = {
 46         .name   = "s3c64xx_cpuidle",
 47         .owner  = THIS_MODULE,
 48         .en_core_tk_irqen = 1,
 49         .states = {
 50                 {
 51                         .enter            = s3c64xx_enter_idle,
 52                         .exit_latency     = 1,
 53                         .target_residency = 1,
 54                         .flags            = CPUIDLE_FLAG_TIME_VALID,
 55                         .name             = "IDLE",
 56                         .desc             = "System active, ARM gated",
 57                 },
 58         },
 59         .state_count = 1,
 60 };
 61 
 62 static int __init s3c64xx_init_cpuidle(void)
 63 {
 64         int ret;
 65 
 66         cpuidle_register_driver(&s3c64xx_cpuidle_driver);
 67 
 68         ret = cpuidle_register_device(&s3c64xx_cpuidle_device);
 69         if (ret) {
 70                 pr_err("Failed to register cpuidle device: %d\n", ret);
 71                 return ret;
 72         }
 73 
 74         return 0;
 75 }
 76 device_initcall(s3c64xx_init_cpuidle);
 77 

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