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

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  1 // SPDX-License-Identifier: GPL-2.0
  2 //
  3 // Copyright (c) 2011 Wolfson Microelectronics, plc
  4 // Copyright (c) 2011 Samsung Electronics Co., Ltd.
  5 //              http://www.samsung.com
  6 
  7 #include <linux/kernel.h>
  8 #include <linux/init.h>
  9 #include <linux/cpuidle.h>
 10 #include <linux/io.h>
 11 #include <linux/export.h>
 12 #include <linux/time.h>
 13 
 14 #include <asm/cpuidle.h>
 15 
 16 #include <plat/cpu.h>
 17 #include <mach/map.h>
 18 
 19 #include "regs-sys.h"
 20 #include "regs-syscon-power.h"
 21 
 22 static int s3c64xx_enter_idle(struct cpuidle_device *dev,
 23                               struct cpuidle_driver *drv,
 24                               int index)
 25 {
 26         unsigned long tmp;
 27 
 28         /* Setup PWRCFG to enter idle mode */
 29         tmp = __raw_readl(S3C64XX_PWR_CFG);
 30         tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK;
 31         tmp |= S3C64XX_PWRCFG_CFG_WFI_IDLE;
 32         __raw_writel(tmp, S3C64XX_PWR_CFG);
 33 
 34         cpu_do_idle();
 35 
 36         return index;
 37 }
 38 
 39 static struct cpuidle_driver s3c64xx_cpuidle_driver = {
 40         .name   = "s3c64xx_cpuidle",
 41         .owner  = THIS_MODULE,
 42         .states = {
 43                 {
 44                         .enter            = s3c64xx_enter_idle,
 45                         .exit_latency     = 1,
 46                         .target_residency = 1,
 47                         .name             = "IDLE",
 48                         .desc             = "System active, ARM gated",
 49                 },
 50         },
 51         .state_count = 1,
 52 };
 53 
 54 static int __init s3c64xx_init_cpuidle(void)
 55 {
 56         if (soc_is_s3c64xx())
 57                 return cpuidle_register(&s3c64xx_cpuidle_driver, NULL);
 58         return 0;
 59 }
 60 device_initcall(s3c64xx_init_cpuidle);
 61 

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