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29cb3cd208
There are SoCs where attempting to enter a low power state is ignored, and the CPU continues executing instructions with all state preserved. It is over-complex at that point to disable the MMU just to call the resume path. Instead, allow the suspend finisher to return error codes to abort suspend in this circumstance, where the cpu_suspend internals will then unwind the saved state on the stack. Also omit the tlb flush as no changes to the page tables will have happened. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
122 lines
2.6 KiB
C
122 lines
2.6 KiB
C
/* linux/arch/arm/mach-s3c2412/pm.c
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*
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* Copyright (c) 2006 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* http://armlinux.simtec.co.uk/.
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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/types.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/timer.h>
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#include <linux/init.h>
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#include <linux/sysdev.h>
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#include <linux/syscore_ops.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <mach/hardware.h>
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#include <asm/cacheflush.h>
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#include <asm/irq.h>
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#include <mach/regs-power.h>
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#include <mach/regs-gpioj.h>
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#include <mach/regs-gpio.h>
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#include <mach/regs-dsc.h>
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#include <plat/cpu.h>
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#include <plat/pm.h>
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#include <plat/s3c2412.h>
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extern void s3c2412_sleep_enter(void);
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static int s3c2412_cpu_suspend(unsigned long arg)
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{
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unsigned long tmp;
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/* set our standby method to sleep */
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tmp = __raw_readl(S3C2412_PWRCFG);
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tmp |= S3C2412_PWRCFG_STANDBYWFI_SLEEP;
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__raw_writel(tmp, S3C2412_PWRCFG);
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s3c2412_sleep_enter();
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panic("sleep resumed to originator?");
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}
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static void s3c2412_pm_prepare(void)
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{
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}
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static int s3c2412_pm_add(struct sys_device *sysdev)
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{
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pm_cpu_prep = s3c2412_pm_prepare;
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pm_cpu_sleep = s3c2412_cpu_suspend;
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return 0;
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}
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static struct sleep_save s3c2412_sleep[] = {
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SAVE_ITEM(S3C2412_DSC0),
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SAVE_ITEM(S3C2412_DSC1),
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SAVE_ITEM(S3C2413_GPJDAT),
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SAVE_ITEM(S3C2413_GPJCON),
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SAVE_ITEM(S3C2413_GPJUP),
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/* save the PWRCFG to get back to original sleep method */
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SAVE_ITEM(S3C2412_PWRCFG),
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/* save the sleep configuration anyway, just in case these
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* get damaged during wakeup */
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SAVE_ITEM(S3C2412_GPBSLPCON),
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SAVE_ITEM(S3C2412_GPCSLPCON),
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SAVE_ITEM(S3C2412_GPDSLPCON),
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SAVE_ITEM(S3C2412_GPFSLPCON),
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SAVE_ITEM(S3C2412_GPGSLPCON),
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SAVE_ITEM(S3C2412_GPHSLPCON),
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SAVE_ITEM(S3C2413_GPJSLPCON),
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};
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static struct sysdev_driver s3c2412_pm_driver = {
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.add = s3c2412_pm_add,
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};
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static __init int s3c2412_pm_init(void)
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{
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return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_pm_driver);
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}
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arch_initcall(s3c2412_pm_init);
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static int s3c2412_pm_suspend(void)
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{
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s3c_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
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return 0;
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}
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static void s3c2412_pm_resume(void)
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{
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unsigned long tmp;
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tmp = __raw_readl(S3C2412_PWRCFG);
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tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
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tmp |= S3C2412_PWRCFG_STANDBYWFI_IDLE;
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__raw_writel(tmp, S3C2412_PWRCFG);
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s3c_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
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}
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struct syscore_ops s3c2412_pm_syscore_ops = {
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.suspend = s3c2412_pm_suspend,
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.resume = s3c2412_pm_resume,
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};
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