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ARM: tango: add Suspend-to-RAM support

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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>
This commit is contained in:
Marc Gonzalez 2016-07-07 15:08:14 +02:00 committed by Arnd Bergmann
parent 2e2843f1b7
commit a30eceb7a5
3 changed files with 34 additions and 0 deletions
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1
arch/arm/mach-tango/Makefile
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@ -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

32
arch/arm/mach-tango/pm.c Normal file
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@ -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);

1
arch/arm/mach-tango/smc.h
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@ -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)