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authorLorenzo Pieralisi <lorenzo.pieralisi@arm.com>2014-07-17 13:30:07 +0400
committerCatalin Marinas <catalin.marinas@arm.com>2014-09-12 13:48:55 +0400
commitd64f84f696463c58e1908510e45b0f5d450f737a (patch)
tree6a401e81c34556e447117a8450b3fe86947f12f5 /arch/arm64/include/asm/cpuidle.h
parent714f59925595b9c2ea9c22b107b340d38e3b3bc9 (diff)
downloadlinux-d64f84f696463c58e1908510e45b0f5d450f737a.tar.xz
arm64: kernel: introduce cpu_init_idle CPU operation
The CPUidle subsystem on ARM64 machines requires the idle states implementation back-end to initialize idle states parameter upon boot. This patch adds a hook in the CPU operations structure that should be initialized by the CPU operations back-end in order to provide a function that initializes cpu idle states. This patch also adds the infrastructure to arm64 kernel required to export the CPU operations based initialization interface, so that drivers (ie CPUidle) can use it when they are initialized at probe time. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/cpuidle.h')
-rw-r--r--arch/arm64/include/asm/cpuidle.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cpuidle.h b/arch/arm64/include/asm/cpuidle.h
new file mode 100644
index 000000000000..b52a9932e2b1
--- /dev/null
+++ b/arch/arm64/include/asm/cpuidle.h
@@ -0,0 +1,13 @@
+#ifndef __ASM_CPUIDLE_H
+#define __ASM_CPUIDLE_H
+
+#ifdef CONFIG_CPU_IDLE
+extern int cpu_init_idle(unsigned int cpu);
+#else
+static inline int cpu_init_idle(unsigned int cpu)
+{
+ return -EOPNOTSUPP;
+}
+#endif
+
+#endif