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ARM: mach-shmobile: Suspend-to-RAM support 

This patch adds a simple Suspend-to-RAM implementation
for SH-Mobile ARM. The struct shmobile_suspend_ops are
kept global to allow cpu-specific code to override
the callbacks if needed.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2011-04-29 02:23:28 +09:00 committed by Paul Mundt
parent cac6f98dfc
commit c3dada1894
3 changed files with 51 additions and 0 deletions
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3
arch/arm/mach-shmobile/Makefile
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@ -30,6 +30,9 @@ obj-$(CONFIG_ARCH_SH7377) += entry-intc.o
obj-$(CONFIG_ARCH_SH7372) += entry-intc.o
obj-$(CONFIG_ARCH_SH73A0) += entry-gic.o
# PM objects
obj-$(CONFIG_SUSPEND) += suspend.o
# Board objects
obj-$(CONFIG_MACH_G3EVM) += board-g3evm.o
obj-$(CONFIG_MACH_G4EVM) += board-g4evm.o

1
arch/arm/mach-shmobile/include/mach/common.h
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@ -8,6 +8,7 @@ struct clk;
extern int clk_init(void);
extern void shmobile_handle_irq_intc(struct pt_regs *);
extern void shmobile_handle_irq_gic(struct pt_regs *);
extern struct platform_suspend_ops shmobile_suspend_ops;
extern void sh7367_init_irq(void);
extern void sh7367_add_early_devices(void);

47
arch/arm/mach-shmobile/suspend.c Normal file
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@ -0,0 +1,47 @@
/*
* Suspend-to-RAM support code for SH-Mobile ARM
*
* Copyright (C) 2011 Magnus Damm
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/pm.h>
#include <linux/suspend.h>
#include <linux/module.h>
#include <linux/err.h>
#include <asm/system.h>
#include <asm/io.h>
static int shmobile_suspend_default_enter(suspend_state_t suspend_state)
{
cpu_do_idle();
return 0;
}
static int shmobile_suspend_begin(suspend_state_t state)
{
disable_hlt();
return 0;
}
static void shmobile_suspend_end(void)
{
enable_hlt();
}
struct platform_suspend_ops shmobile_suspend_ops = {
.begin = shmobile_suspend_begin,
.end = shmobile_suspend_end,
.enter = shmobile_suspend_default_enter,
.valid = suspend_valid_only_mem,
};
static int __init shmobile_suspend_init(void)
{
suspend_set_ops(&shmobile_suspend_ops);
return 0;
}
late_initcall(shmobile_suspend_init);