Thread (41 messages) 41 messages, 6 authors, 2014-05-14
STALE4418d

[Patch v3 5/5] mcpm: exynos: populate suspend and powered_up callbacks

From: Chander Kashyap <hidden>
Date: 2014-05-05 08:28:25
Also in: linux-pm, linux-samsung-soc, lkml
Subsystem: arm port, the rest · Maintainers: Russell King, Linus Torvalds

In order to support cpuidle through mcpm, suspend and powered-up
callbacks are required in mcpm platform code.
Hence populate the same callbacks.

Signed-off-by: Chander Kashyap <redacted>
Signed-off-by: Chander Kashyap <redacted>
---
Changes in v3:
	1. Removed coherance enablement after suspend failure.
	2. Use generic function to poweron cpu.
changes in v2:
	1. Fixed typo: enynos_pmu_cpunr to exynos_pmu_cpunr
 arch/arm/mach-exynos/mcpm-exynos.c |   34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
diff --git a/arch/arm/mach-exynos/mcpm-exynos.c b/arch/arm/mach-exynos/mcpm-exynos.c
index d0f7461..6d4a907 100644
--- a/arch/arm/mach-exynos/mcpm-exynos.c
+++ b/arch/arm/mach-exynos/mcpm-exynos.c
@@ -256,10 +256,44 @@ static int exynos_power_down_finish(unsigned int cpu, unsigned int cluster)
 	return -ETIMEDOUT; /* timeout */
 }
 
+void exynos_powered_up(void)
+{
+	unsigned int mpidr, cpu, cluster;
+
+	mpidr = read_cpuid_mpidr();
+	cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+	cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+
+	arch_spin_lock(&exynos_mcpm_lock);
+	if (cpu_use_count[cpu][cluster] == 0)
+		cpu_use_count[cpu][cluster] = 1;
+	arch_spin_unlock(&exynos_mcpm_lock);
+}
+
+static void exynos_suspend(u64 residency)
+{
+	unsigned int mpidr, cpunr;
+
+	mpidr = read_cpuid_mpidr();
+	cpunr = exynos_pmu_cpunr(mpidr);
+
+	__raw_writel(virt_to_phys(mcpm_entry_point), ns_sram_base_addr + 0x1c);
+
+	exynos_power_down();
+
+	/*
+	 * Execution reaches here only if cpu did not power down.
+	 * Hence roll back the changes done in exynos_power_down function.
+	*/
+	exynos_cpu_powerup(cpunr);
+}
+
 static const struct mcpm_platform_ops exynos_power_ops = {
 	.power_up		= exynos_power_up,
 	.power_down		= exynos_power_down,
 	.power_down_finish	= exynos_power_down_finish,
+	.suspend		= exynos_suspend,
+	.powered_up		= exynos_powered_up,
 };
 
 static void __init exynos_mcpm_usage_count_init(void)
-- 
1.7.9.5
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