98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
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/* linux/arch/arm/plat-s3c/pm.c
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*
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* Copyright 2008 Openmoko, Inc.
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* Copyright 2004,2006,2008 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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* http://armlinux.simtec.co.uk/
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*
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* S3C common power management (suspend to ram) 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/init.h>
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#include <linux/suspend.h>
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#include <linux/errno.h>
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#include <linux/io.h>
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#include <plat/pm.h>
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/* for external use */
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unsigned long s3c_pm_flags;
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#ifdef CONFIG_S3C2410_PM_DEBUG
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extern void printascii(const char *);
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void s3c_pm_dbg(const char *fmt, ...)
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{
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va_list va;
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char buff[256];
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va_start(va, fmt);
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vsprintf(buff, fmt, va);
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va_end(va);
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printascii(buff);
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}
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#endif /* CONFIG_S3C2410_PM_DEBUG */
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/* helper functions to save and restore register state */
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/**
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* s3c_pm_do_save() - save a set of registers for restoration on resume.
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* @ptr: Pointer to an array of registers.
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* @count: Size of the ptr array.
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*
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* Run through the list of registers given, saving their contents in the
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* array for later restoration when we wakeup.
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*/
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void s3c_pm_do_save(struct sleep_save *ptr, int count)
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{
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for (; count > 0; count--, ptr++) {
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ptr->val = __raw_readl(ptr->reg);
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S3C_PMDBG("saved %p value %08lx\n", ptr->reg, ptr->val);
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}
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}
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/**
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* s3c_pm_do_restore() - restore register values from the save list.
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* @ptr: Pointer to an array of registers.
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* @count: Size of the ptr array.
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*
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* Restore the register values saved from s3c_pm_do_save().
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*
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* Note, we do not use S3C_PMDBG() in here, as the system may not have
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* restore the UARTs state yet
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*/
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void s3c_pm_do_restore(struct sleep_save *ptr, int count)
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{
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for (; count > 0; count--, ptr++) {
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printk(KERN_DEBUG "restore %p (restore %08lx, was %08x)\n",
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ptr->reg, ptr->val, __raw_readl(ptr->reg));
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__raw_writel(ptr->val, ptr->reg);
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}
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}
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/**
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* s3c_pm_do_restore_core() - early restore register values from save list.
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*
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* This is similar to s3c_pm_do_restore() except we try and minimise the
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* side effects of the function in case registers that hardware might need
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* to work has been restored.
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*
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* WARNING: Do not put any debug in here that may effect memory or use
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* peripherals, as things may be changing!
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*/
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void s3c_pm_do_restore_core(struct sleep_save *ptr, int count)
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{
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for (; count > 0; count--, ptr++)
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__raw_writel(ptr->val, ptr->reg);
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}
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