82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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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#include <linux/device.h>
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#include <linux/syscore_ops.h>
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#include <linux/io.h>
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#include <asm/cacheflush.h>
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#include "regs-s3c2443-clock.h"
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#include "cpu.h"
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#include "pm.h"
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#include "s3c2412-power.h"
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#ifdef CONFIG_PM_SLEEP
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extern void s3c2412_sleep_enter(void);
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static int s3c2416_cpu_suspend(unsigned long arg)
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{
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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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pr_info("Failed to suspend the system\n");
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return 1; /* Aborting suspend */
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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(__pa_symbol(s3c_cpu_resume), S3C2412_INFORM1);
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}
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static int s3c2416_pm_add(struct device *dev, struct subsys_interface *sif)
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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 struct subsys_interface s3c2416_pm_interface = {
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.name = "s3c2416_pm",
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.subsys = &s3c2416_subsys,
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.add_dev = s3c2416_pm_add,
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};
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static __init int s3c2416_pm_init(void)
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{
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return subsys_interface_register(&s3c2416_pm_interface);
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}
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arch_initcall(s3c2416_pm_init);
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#endif
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static void s3c2416_pm_resume(void)
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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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}
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struct syscore_ops s3c2416_pm_syscore_ops = {
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.resume = s3c2416_pm_resume,
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};
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