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| author | Marc Gonzalez <marc_gonzalez@sigmadesigns.com> | 2016-07-07 16:08:14 +0300 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2016-07-07 17:09:30 +0300 |
| commit | a30eceb7a59daa2d92cca7f2f30b9bd91a8d7111 (patch) | |
| tree | 2d224ac5d12222ccd1c86642340d85c006068c14 /arch/arm/mach-tango | |
| parent | 2e2843f1b7a3c88761596fc5b2ef21b85c05ef55 (diff) | |
| download | linux-a30eceb7a59daa2d92cca7f2f30b9bd91a8d7111.tar.xz | |
ARM: tango: add Suspend-to-RAM support
Ask firmware to put RAM in self-refresh mode and power system down.
echo mem > /sys/power/state
See Documentation/power/states.txt
Signed-off-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arm/mach-tango')
| -rw-r--r-- | arch/arm/mach-tango/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/mach-tango/pm.c | 32 | ||||
| -rw-r--r-- | arch/arm/mach-tango/smc.h | 1 |
3 files changed, 34 insertions, 0 deletions
diff --git a/arch/arm/mach-tango/Makefile b/arch/arm/mach-tango/Makefile index f33935e42e77..204fcd9fe180 100644 --- a/arch/arm/mach-tango/Makefile +++ b/arch/arm/mach-tango/Makefile @@ -3,3 +3,4 @@ AFLAGS_smc.o := -Wa,-march=armv7-a$(plus_sec) obj-y += setup.o smc.o obj-$(CONFIG_SMP) += platsmp.o +obj-$(CONFIG_SUSPEND) += pm.o diff --git a/arch/arm/mach-tango/pm.c b/arch/arm/mach-tango/pm.c new file mode 100644 index 000000000000..b05c6d6f99d0 --- /dev/null +++ b/arch/arm/mach-tango/pm.c @@ -0,0 +1,32 @@ +#include <linux/init.h> +#include <linux/suspend.h> +#include <asm/suspend.h> +#include "smc.h" + +static int tango_pm_powerdown(unsigned long arg) +{ + tango_suspend(virt_to_phys(cpu_resume)); + + return -EIO; /* tango_suspend has failed */ +} + +static int tango_pm_enter(suspend_state_t state) +{ + if (state == PM_SUSPEND_MEM) + return cpu_suspend(0, tango_pm_powerdown); + + return -EINVAL; +} + +static const struct platform_suspend_ops tango_pm_ops = { + .enter = tango_pm_enter, + .valid = suspend_valid_only_mem, +}; + +static int __init tango_pm_init(void) +{ + suspend_set_ops(&tango_pm_ops); + return 0; +} + +late_initcall(tango_pm_init); diff --git a/arch/arm/mach-tango/smc.h b/arch/arm/mach-tango/smc.h index 3d31f984f44c..57919539da1b 100644 --- a/arch/arm/mach-tango/smc.h +++ b/arch/arm/mach-tango/smc.h @@ -3,5 +3,6 @@ extern int tango_smc(unsigned int val, unsigned int service); #define tango_set_l2_control(val) tango_smc(val, 0x102) #define tango_start_aux_core(val) tango_smc(val, 0x104) #define tango_set_aux_boot_addr(val) tango_smc(val, 0x105) +#define tango_suspend(val) tango_smc(val, 0x120) #define tango_aux_core_die(val) tango_smc(val, 0x121) #define tango_aux_core_kill(val) tango_smc(val, 0x122) |