From: marc_gonzalez@sigmadesigns•com (Marc Gonzalez)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v3] ARM: tango: add Suspend-to-RAM support
Date: Thu, 7 Jul 2016 15:08:14 +0200 [thread overview]
Message-ID: <577E543E.80401@sigmadesigns.com> (raw)
In-Reply-To: <577A25F8.80702@sigmadesigns.com>
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>
---
v3 is identical to v2 minus the RFC tag
Olof, if still possible, please merge for v4.8
---
arch/arm/mach-tango/Makefile | 1 +
arch/arm/mach-tango/pm.c | 32 ++++++++++++++++++++++++++++++++
arch/arm/mach-tango/smc.h | 1 +
3 files changed, 34 insertions(+)
create mode 100644 arch/arm/mach-tango/pm.c
diff --git a/arch/arm/mach-tango/Makefile b/arch/arm/mach-tango/Makefile
index 7ca753aa9fb6..822b7ca803c6 100644
--- a/arch/arm/mach-tango/Makefile
+++ b/arch/arm/mach-tango/Makefile
@@ -3,3 +3,4 @@ AFLAGS_smc.o := -Wa,-march=armv7-a$(plus_sec)
obj-y += setup.o smc.o xenv.o
obj-$(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)
--
2.9.0
next prev parent reply other threads:[~2016-07-07 13:08 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-29 13:58 [RFC PATCH v1] ARM: tango: add Suspend-to-RAM support Marc Gonzalez
2016-06-29 17:48 ` Sudeep Holla
2016-06-30 8:44 ` [RFC PATCH v2] " Marc Gonzalez
2016-07-04 9:01 ` Marc Gonzalez
2016-07-07 13:08 ` Marc Gonzalez [this message]
2016-07-07 14:01 ` [PATCH v3] " Arnd Bergmann
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