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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>
185 lines
4.7 KiB
C
185 lines
4.7 KiB
C
/* arch/arm/plat-samsung/include/plat/pm.h
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*
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* Copyright (c) 2004 Simtec Electronics
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* http://armlinux.simtec.co.uk/
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* Written by Ben Dooks, <ben@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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/* s3c_pm_init
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*
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* called from board at initialisation time to setup the power
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* management
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*/
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#include <linux/irq.h>
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struct sys_device;
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#ifdef CONFIG_PM
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extern __init int s3c_pm_init(void);
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#else
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static inline int s3c_pm_init(void)
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{
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return 0;
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}
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#endif
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/* configuration for the IRQ mask over sleep */
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extern unsigned long s3c_irqwake_intmask;
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extern unsigned long s3c_irqwake_eintmask;
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/* IRQ masks for IRQs allowed to go to sleep (see irq.c) */
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extern unsigned long s3c_irqwake_intallow;
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extern unsigned long s3c_irqwake_eintallow;
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/* per-cpu sleep functions */
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extern void (*pm_cpu_prep)(void);
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extern int (*pm_cpu_sleep)(unsigned long);
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/* Flags for PM Control */
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extern unsigned long s3c_pm_flags;
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extern unsigned char pm_uart_udivslot; /* true to save UART UDIVSLOT */
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/* from sleep.S */
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extern void s3c_cpu_resume(void);
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extern int s3c2410_cpu_suspend(unsigned long);
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/* sleep save info */
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/**
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* struct sleep_save - save information for shared peripherals.
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* @reg: Pointer to the register to save.
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* @val: Holder for the value saved from reg.
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*
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* This describes a list of registers which is used by the pm core and
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* other subsystem to save and restore register values over suspend.
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*/
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struct sleep_save {
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void __iomem *reg;
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unsigned long val;
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};
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#define SAVE_ITEM(x) \
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{ .reg = (x) }
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/**
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* struct pm_uart_save - save block for core UART
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* @ulcon: Save value for S3C2410_ULCON
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* @ucon: Save value for S3C2410_UCON
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* @ufcon: Save value for S3C2410_UFCON
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* @umcon: Save value for S3C2410_UMCON
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* @ubrdiv: Save value for S3C2410_UBRDIV
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*
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* Save block for UART registers to be held over sleep and restored if they
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* are needed (say by debug).
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*/
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struct pm_uart_save {
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u32 ulcon;
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u32 ucon;
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u32 ufcon;
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u32 umcon;
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u32 ubrdiv;
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u32 udivslot;
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};
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/* helper functions to save/restore lists of registers. */
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extern void s3c_pm_do_save(struct sleep_save *ptr, int count);
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extern void s3c_pm_do_restore(struct sleep_save *ptr, int count);
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extern void s3c_pm_do_restore_core(struct sleep_save *ptr, int count);
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#ifdef CONFIG_PM
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extern int s3c_irqext_wake(struct irq_data *data, unsigned int state);
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extern int s3c24xx_irq_suspend(void);
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extern void s3c24xx_irq_resume(void);
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#else
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#define s3c_irqext_wake NULL
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#define s3c24xx_irq_suspend NULL
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#define s3c24xx_irq_resume NULL
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#endif
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extern struct syscore_ops s3c24xx_irq_syscore_ops;
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/* PM debug functions */
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#ifdef CONFIG_SAMSUNG_PM_DEBUG
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/**
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* s3c_pm_dbg() - low level debug function for use in suspend/resume.
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* @msg: The message to print.
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*
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* This function is used mainly to debug the resume process before the system
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* can rely on printk/console output. It uses the low-level debugging output
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* routine printascii() to do its work.
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*/
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extern void s3c_pm_dbg(const char *msg, ...);
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#define S3C_PMDBG(fmt...) s3c_pm_dbg(fmt)
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#else
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#define S3C_PMDBG(fmt...) printk(KERN_DEBUG fmt)
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#endif
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#ifdef CONFIG_S3C_PM_DEBUG_LED_SMDK
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/**
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* s3c_pm_debug_smdkled() - Debug PM suspend/resume via SMDK Board LEDs
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* @set: set bits for the state of the LEDs
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* @clear: clear bits for the state of the LEDs.
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*/
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extern void s3c_pm_debug_smdkled(u32 set, u32 clear);
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#else
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static inline void s3c_pm_debug_smdkled(u32 set, u32 clear) { }
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#endif /* CONFIG_S3C_PM_DEBUG_LED_SMDK */
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/* suspend memory checking */
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#ifdef CONFIG_SAMSUNG_PM_CHECK
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extern void s3c_pm_check_prepare(void);
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extern void s3c_pm_check_restore(void);
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extern void s3c_pm_check_cleanup(void);
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extern void s3c_pm_check_store(void);
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#else
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#define s3c_pm_check_prepare() do { } while(0)
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#define s3c_pm_check_restore() do { } while(0)
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#define s3c_pm_check_cleanup() do { } while(0)
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#define s3c_pm_check_store() do { } while(0)
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#endif
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/**
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* s3c_pm_configure_extint() - ensure pins are correctly set for IRQ
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*
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* Setup all the necessary GPIO pins for waking the system on external
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* interrupt.
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*/
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extern void s3c_pm_configure_extint(void);
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/**
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* s3c_pm_restore_gpios() - restore the state of the gpios after sleep.
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*
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* Restore the state of the GPIO pins after sleep, which may involve ensuring
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* that we do not glitch the state of the pins from that the bootloader's
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* resume code has done.
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*/
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extern void s3c_pm_restore_gpios(void);
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/**
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* s3c_pm_save_gpios() - save the state of the GPIOs for restoring after sleep.
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*
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* Save the GPIO states for resotration on resume. See s3c_pm_restore_gpios().
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*/
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extern void s3c_pm_save_gpios(void);
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extern void s3c_pm_save_core(void);
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extern void s3c_pm_restore_core(void);
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