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ARM: SAMSUNG: Move common save/restore helpers to separate file 

To separate legacy PM code from generic helpers, this patch moves the
generic register save/restore helpers to a new file called pm-common.c
that is compiled always when CONFIG_PM_SLEEP is enabled, to allow
platforms that do not want to use the legacy PM code use the generic
helpers.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
This commit is contained in:
Tomasz Figa 2014-03-18 07:28:10 +09:00 committed by Kukjin Kim
parent 72551f6cf1
commit b27899178c
5 changed files with 102 additions and 81 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm/plat-samsung/Makefile
View File

@ -47,6 +47,7 @@ obj-$(CONFIG_SAMSUNG_DMADEV) += dma-ops.o
# PM support
obj-$(CONFIG_PM_SLEEP) += pm-common.o
obj-$(CONFIG_SAMSUNG_PM) += pm.o
obj-$(CONFIG_SAMSUNG_PM_GPIO) += pm-gpio.o
obj-$(CONFIG_SAMSUNG_PM_CHECK) += pm-check.o

26
arch/arm/plat-samsung/include/plat/pm-common.h
View File

@ -13,6 +13,32 @@
#ifndef __PLAT_SAMSUNG_PM_COMMON_H
#define __PLAT_SAMSUNG_PM_COMMON_H __FILE__
#include <linux/irq.h>
/* sleep save info */
/**
* struct sleep_save - save information for shared peripherals.
* @reg: Pointer to the register to save.
* @val: Holder for the value saved from reg.
*
* This describes a list of registers which is used by the pm core and
* other subsystem to save and restore register values over suspend.
*/
struct sleep_save {
void __iomem *reg;
unsigned long val;
};
#define SAVE_ITEM(x) \
{ .reg = (x) }
/* helper functions to save/restore lists of registers. */
extern void s3c_pm_do_save(struct sleep_save *ptr, int count);
extern void s3c_pm_do_restore(const struct sleep_save *ptr, int count);
extern void s3c_pm_do_restore_core(const struct sleep_save *ptr, int count);
/* PM debug functions */
/**

25
arch/arm/plat-samsung/include/plat/pm.h
View File

@ -15,7 +15,6 @@
* management
*/
#include <linux/irq.h>
#include <plat/pm-common.h>
struct device;
@ -59,30 +58,6 @@ extern unsigned long s3c_pm_flags;
extern int s3c2410_cpu_suspend(unsigned long);
/* sleep save info */
/**
* struct sleep_save - save information for shared peripherals.
* @reg: Pointer to the register to save.
* @val: Holder for the value saved from reg.
*
* This describes a list of registers which is used by the pm core and
* other subsystem to save and restore register values over suspend.
*/
struct sleep_save {
void __iomem *reg;
unsigned long val;
};
#define SAVE_ITEM(x) \
{ .reg = (x) }
/* helper functions to save/restore lists of registers. */
extern void s3c_pm_do_save(struct sleep_save *ptr, int count);
extern void s3c_pm_do_restore(const struct sleep_save *ptr, int count);
extern void s3c_pm_do_restore_core(const struct sleep_save *ptr, int count);
#ifdef CONFIG_SAMSUNG_PM
extern int s3c_irq_wake(struct irq_data *data, unsigned int state);
extern int s3c_irqext_wake(struct irq_data *data, unsigned int state);

75
arch/arm/plat-samsung/pm-common.c Normal file
View File

@ -0,0 +1,75 @@
/*
* Copyright (C) 2013 Samsung Electronics Co., Ltd.
* Tomasz Figa <t.figa@samsung.com>
* Copyright (C) 2008 Openmoko, Inc.
* Copyright (C) 2004-2008 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* Samsung common power management helper functions.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/io.h>
#include <linux/kernel.h>
#include <plat/pm-common.h>
/* helper functions to save and restore register state */
/**
* s3c_pm_do_save() - save a set of registers for restoration on resume.
* @ptr: Pointer to an array of registers.
* @count: Size of the ptr array.
*
* Run through the list of registers given, saving their contents in the
* array for later restoration when we wakeup.
*/
void s3c_pm_do_save(struct sleep_save *ptr, int count)
{
for (; count > 0; count--, ptr++) {
ptr->val = __raw_readl(ptr->reg);
S3C_PMDBG("saved %p value %08lx\n", ptr->reg, ptr->val);
}
}
/**
* s3c_pm_do_restore() - restore register values from the save list.
* @ptr: Pointer to an array of registers.
* @count: Size of the ptr array.
*
* Restore the register values saved from s3c_pm_do_save().
*
* Note, we do not use S3C_PMDBG() in here, as the system may not have
* restore the UARTs state yet
*/
void s3c_pm_do_restore(const struct sleep_save *ptr, int count)
{
for (; count > 0; count--, ptr++) {
pr_debug("restore %p (restore %08lx, was %08x)\n",
ptr->reg, ptr->val, __raw_readl(ptr->reg));
__raw_writel(ptr->val, ptr->reg);
}
}
/**
* s3c_pm_do_restore_core() - early restore register values from save list.
*
* This is similar to s3c_pm_do_restore() except we try and minimise the
* side effects of the function in case registers that hardware might need
* to work has been restored.
*
* WARNING: Do not put any debug in here that may effect memory or use
* peripherals, as things may be changing!
*/
void s3c_pm_do_restore_core(const struct sleep_save *ptr, int count)
{
for (; count > 0; count--, ptr++)
__raw_writel(ptr->val, ptr->reg);
}

56
arch/arm/plat-samsung/pm.c
View File

@ -66,62 +66,6 @@ int s3c_irqext_wake(struct irq_data *data, unsigned int state)
return 0;
}
/* helper functions to save and restore register state */
/**
* s3c_pm_do_save() - save a set of registers for restoration on resume.
* @ptr: Pointer to an array of registers.
* @count: Size of the ptr array.
*
* Run through the list of registers given, saving their contents in the
* array for later restoration when we wakeup.
*/
void s3c_pm_do_save(struct sleep_save *ptr, int count)
{
for (; count > 0; count--, ptr++) {
ptr->val = __raw_readl(ptr->reg);
S3C_PMDBG("saved %p value %08lx\n", ptr->reg, ptr->val);
}
}
/**
* s3c_pm_do_restore() - restore register values from the save list.
* @ptr: Pointer to an array of registers.
* @count: Size of the ptr array.
*
* Restore the register values saved from s3c_pm_do_save().
*
* Note, we do not use S3C_PMDBG() in here, as the system may not have
* restore the UARTs state yet
*/
void s3c_pm_do_restore(const struct sleep_save *ptr, int count)
{
for (; count > 0; count--, ptr++) {
printk(KERN_DEBUG "restore %p (restore %08lx, was %08x)\n",
ptr->reg, ptr->val, __raw_readl(ptr->reg));
__raw_writel(ptr->val, ptr->reg);
}
}
/**
* s3c_pm_do_restore_core() - early restore register values from save list.
*
* This is similar to s3c_pm_do_restore() except we try and minimise the
* side effects of the function in case registers that hardware might need
* to work has been restored.
*
* WARNING: Do not put any debug in here that may effect memory or use
* peripherals, as things may be changing!
*/
void s3c_pm_do_restore_core(const struct sleep_save *ptr, int count)
{
for (; count > 0; count--, ptr++)
__raw_writel(ptr->val, ptr->reg);
}
/* s3c2410_pm_show_resume_irqs
*
* print any IRQs asserted at resume time (ie, we woke from)