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authorMarc Gonzalez <marc_gonzalez@sigmadesigns.com>2016-07-07 15:08:14 +0200
committerArnd Bergmann <arnd@arndb.de>2016-07-07 16:09:30 +0200
commita30eceb7a59daa2d92cca7f2f30b9bd91a8d7111 (patch)
tree2d224ac5d12222ccd1c86642340d85c006068c14 /arch/arm/mach-tango
parent2e2843f1b7a3c88761596fc5b2ef21b85c05ef55 (diff)
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/Makefile1
-rw-r--r--arch/arm/mach-tango/pm.c32
-rw-r--r--arch/arm/mach-tango/smc.h1
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)