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>

diff --git a/arch/arm/mach-tango/Makefile b/arch/arm/mach-tango/Makefile
index f33935e42e77456a20ecccb38bf926aee6d7bc38..204fcd9fe180fc9cc3b9353e739ab0d7cc11deaa 100644 (file)
--- 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 (file)
index 0000000..b05c6d6
--- /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 3d31f984f44ce149ce0fc48e37f939dad64d0ceb..57919539da1baddf94bff2af6a3161d79c18493b 100644 (file)
--- 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)