85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
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/* linux/arch/arm/mach-s3c2416/pm.c
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*
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* Copyright (c) 2010 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* S3C2416 - PM support (Based on Ben Dooks' S3C2412 PM support)
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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/sysdev.h>
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#include <linux/io.h>
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#include <asm/cacheflush.h>
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#include <mach/regs-power.h>
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#include <mach/regs-s3c2443-clock.h>
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#include <plat/cpu.h>
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#include <plat/pm.h>
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extern void s3c2412_sleep_enter(void);
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static void s3c2416_cpu_suspend(void)
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{
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flush_cache_all();
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/* enable wakeup sources regardless of battery state */
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__raw_writel(S3C2443_PWRCFG_SLEEP, S3C2443_PWRCFG);
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/* set the mode as sleep, 2BED represents "Go to BED" */
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__raw_writel(0x2BED, S3C2443_PWRMODE);
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s3c2412_sleep_enter();
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}
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static void s3c2416_pm_prepare(void)
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{
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/*
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* write the magic value u-boot uses to check for resume into
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* the INFORM0 register, and ensure INFORM1 is set to the
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* correct address to resume from.
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*/
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__raw_writel(0x2BED, S3C2412_INFORM0);
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__raw_writel(virt_to_phys(s3c_cpu_resume), S3C2412_INFORM1);
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}
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static int s3c2416_pm_add(struct sys_device *sysdev)
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{
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pm_cpu_prep = s3c2416_pm_prepare;
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pm_cpu_sleep = s3c2416_cpu_suspend;
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return 0;
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}
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static int s3c2416_pm_suspend(struct sys_device *dev, pm_message_t state)
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{
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return 0;
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}
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static int s3c2416_pm_resume(struct sys_device *dev)
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{
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/* unset the return-from-sleep amd inform flags */
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__raw_writel(0x0, S3C2443_PWRMODE);
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__raw_writel(0x0, S3C2412_INFORM0);
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__raw_writel(0x0, S3C2412_INFORM1);
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return 0;
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}
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static struct sysdev_driver s3c2416_pm_driver = {
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.add = s3c2416_pm_add,
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.suspend = s3c2416_pm_suspend,
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.resume = s3c2416_pm_resume,
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};
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static __init int s3c2416_pm_init(void)
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{
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return sysdev_driver_register(&s3c2416_sysclass, &s3c2416_pm_driver);
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}
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arch_initcall(s3c2416_pm_init);
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