[PATCH v2 2/2] arm: kernel: implement cpuidle_ops with psci backend

[Jisheng Zhang]

This patch implements cpuidle_ops using psci. After this patch, we can
use cpuidle-arm.c with psci backend for both arm and arm64.

Signed-off-by: Jisheng Zhang <jszhang at marvell.com>
---
 arch/arm/kernel/Makefile       |  1 +
 arch/arm/kernel/psci_cpuidle.c | 29 +++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 arch/arm/kernel/psci_cpuidle.c

diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 3b995f5..96383d8 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -91,6 +91,7 @@ obj-$(CONFIG_ARM_VIRT_EXT)	+= hyp-stub.o
 ifeq ($(CONFIG_ARM_PSCI),y)
 obj-y				+= psci-call.o
 obj-$(CONFIG_SMP)		+= psci_smp.o
+obj-$(CONFIG_CPU_IDLE)		+= psci_cpuidle.o
 endif
 
 extra-y := $(head-y) vmlinux.lds
diff --git a/arch/arm/kernel/psci_cpuidle.c b/arch/arm/kernel/psci_cpuidle.c
new file mode 100644
index 0000000..ae85d97
--- /dev/null
+++ b/arch/arm/kernel/psci_cpuidle.c
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2015 Marvell Technology Group Ltd.
+ * Author: Jisheng Zhang <jszhang at marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/cpuidle.h>
+#include <linux/psci.h>
+
+#include <asm/cpuidle.h>
+
+static int psci_cpuidle_suspend(int cpu, unsigned long arg)
+{
+	return cpu_psci_cpu_suspend(arg);
+}
+
+static int psci_cpuidle_init(struct device_node *node, int cpu)
+{
+	return cpu_psci_cpu_init_idle(cpu);
+}
+
+static struct cpuidle_ops psci_cpuidle_ops __initdata = {
+	.suspend = psci_cpuidle_suspend,
+	.init = psci_cpuidle_init,
+};
+CPUIDLE_METHOD_OF_DECLARE(psci_cpuidle, "psci", &psci_cpuidle_ops);
-- 
2.1.4