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ARM: shmobile: sh73a0: Add CPU sleep suspend

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Add the lighest possible sleep mode on Cortex-A9 cores: CPU sleep. It is
entered by a simple dsb and wfi instruction via cpu_do_idle(). As just
clocks are stopped there is no need to save or restore any state of the
system.

Signed-off-by: Bastian Hecht <hechtb+renesas@gmail.com>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Bastian Hecht 2012-12-05 12:13:06 +00:00 committed by Simon Horman
parent 8a21cdaee8
commit 13baf88bd6
4 changed files with 36 additions and 0 deletions
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1
arch/arm/mach-shmobile/Makefile
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@ -37,6 +37,7 @@ obj-$(CONFIG_ARCH_SHMOBILE) += pm-rmobile.o
obj-$(CONFIG_ARCH_SH7372) += pm-sh7372.o sleep-sh7372.o
obj-$(CONFIG_ARCH_R8A7740) += pm-r8a7740.o
obj-$(CONFIG_ARCH_R8A7779) += pm-r8a7779.o
obj-$(CONFIG_ARCH_SH73A0) += pm-sh73a0.o
# Board objects
obj-$(CONFIG_MACH_AP4EVB) += board-ap4evb.o

2
arch/arm/mach-shmobile/board-kzm9g.c
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@ -772,6 +772,8 @@ static void __init kzm_init(void)
sh73a0_add_standard_devices();
platform_add_devices(kzm_devices, ARRAY_SIZE(kzm_devices));
sh73a0_pm_init();
}
static void kzm9g_restart(char mode, const char *cmd)

1
arch/arm/mach-shmobile/include/mach/common.h
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@ -40,6 +40,7 @@ extern void sh73a0_add_early_devices(void);
extern void sh73a0_add_standard_devices(void);
extern void sh73a0_clock_init(void);
extern void sh73a0_pinmux_init(void);
extern void sh73a0_pm_init(void);
extern struct clk sh73a0_extal1_clk;
extern struct clk sh73a0_extal2_clk;
extern struct clk sh73a0_extcki_clk;

32
arch/arm/mach-shmobile/pm-sh73a0.c Normal file
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@ -0,0 +1,32 @@
/*
* sh73a0 Power management support
*
* Copyright (C) 2012 Bastian Hecht <hechtb+renesas@gmail.com>
*
* 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/suspend.h>
#include <mach/common.h>
#ifdef CONFIG_SUSPEND
static int sh73a0_enter_suspend(suspend_state_t suspend_state)
{
cpu_do_idle();
return 0;
}
static void sh73a0_suspend_init(void)
{
shmobile_suspend_ops.enter = sh73a0_enter_suspend;
}
#else
static void sh73a0_suspend_init(void) {}
#endif
void __init sh73a0_pm_init(void)
{
sh73a0_suspend_init();
}