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92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
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/* linux/arch/arm/mach-s3c64xx/cpuidle.c
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*
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* Copyright (c) 2011 Wolfson Microelectronics, plc
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* Copyright (c) 2011 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/cpuidle.h>
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#include <linux/io.h>
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#include <linux/export.h>
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#include <linux/time.h>
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#include <asm/proc-fns.h>
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#include <mach/map.h>
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#include <mach/regs-sys.h>
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#include <mach/regs-syscon-power.h>
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static int s3c64xx_enter_idle(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index)
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{
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struct timeval before, after;
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unsigned long tmp;
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int idle_time;
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local_irq_disable();
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do_gettimeofday(&before);
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/* Setup PWRCFG to enter idle mode */
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tmp = __raw_readl(S3C64XX_PWR_CFG);
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tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK;
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tmp |= S3C64XX_PWRCFG_CFG_WFI_IDLE;
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__raw_writel(tmp, S3C64XX_PWR_CFG);
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cpu_do_idle();
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do_gettimeofday(&after);
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local_irq_enable();
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idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC +
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(after.tv_usec - before.tv_usec);
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dev->last_residency = idle_time;
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return index;
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}
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static struct cpuidle_state s3c64xx_cpuidle_set[] = {
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[0] = {
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.enter = s3c64xx_enter_idle,
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.exit_latency = 1,
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.target_residency = 100000,
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.flags = CPUIDLE_FLAG_TIME_VALID,
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.name = "IDLE",
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.desc = "System active, ARM gated",
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},
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};
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static struct cpuidle_driver s3c64xx_cpuidle_driver = {
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.name = "s3c64xx_cpuidle",
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.owner = THIS_MODULE,
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.state_count = ARRAY_SIZE(s3c64xx_cpuidle_set),
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};
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static struct cpuidle_device s3c64xx_cpuidle_device = {
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.state_count = ARRAY_SIZE(s3c64xx_cpuidle_set),
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};
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static int __init s3c64xx_init_cpuidle(void)
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{
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int ret;
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memcpy(s3c64xx_cpuidle_driver.states, s3c64xx_cpuidle_set,
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sizeof(s3c64xx_cpuidle_set));
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cpuidle_register_driver(&s3c64xx_cpuidle_driver);
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ret = cpuidle_register_device(&s3c64xx_cpuidle_device);
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if (ret) {
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pr_err("Failed to register cpuidle device: %d\n", ret);
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return ret;
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}
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return 0;
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}
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device_initcall(s3c64xx_init_cpuidle);
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