332349518f
Check if the sleep command returns due to a pending interrupt in the standby unit. If this happens, try and ack the IRQ before re-trying the resume. It is currently unclear whether the resume can be backed out of at this stage as this could cause a problem with level based interrupts. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
116 lines
2.6 KiB
C
116 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/platform_device.h>
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#include <asm/hardware.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/arch/regs-power.h>
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#include <asm/arch/regs-gpioj.h>
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#include <asm/arch/regs-gpio.h>
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#include <asm/arch/regs-dsc.h>
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#include <asm/plat-s3c24xx/cpu.h>
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#include <asm/plat-s3c24xx/pm.h>
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#include <asm/plat-s3c24xx/s3c2412.h>
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extern void s3c2412_sleep_enter(void);
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static void s3c2412_cpu_suspend(void)
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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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}
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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 int s3c2412_pm_suspend(struct sys_device *dev, pm_message_t state)
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{
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s3c2410_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
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return 0;
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}
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static int s3c2412_pm_resume(struct sys_device *dev)
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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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s3c2410_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
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return 0;
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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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.suspend = s3c2412_pm_suspend,
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.resume = s3c2412_pm_resume,
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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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