ARM: EXYNOS: populate suspend and powered_up callbacks for mcpm

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 <chander.kashyap@linaro.org>
Signed-off-by: Chander Kashyap <k.chander@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/arch/arm/mach-exynos/mcpm-exynos.c b/arch/arm/mach-exynos/mcpm-exynos.c
index ace0ed617476..13a210865c6f 100644
--- a/arch/arm/mach-exynos/mcpm-exynos.c
+++ b/arch/arm/mach-exynos/mcpm-exynos.c
@@ -257,10 +257,46 @@ static int exynos_wait_for_powerdown(unsigned int cpu, unsigned int cluster)
         return -ETIMEDOUT; /* timeout */
 }
 
+static 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;
+
+        exynos_power_down();
+
+        /*
+         * Execution reaches here only if cpu did not power down.
+         * Hence roll back the changes done in exynos_power_down function.
+         *
+         * CAUTION: "This function requires the stack data to be visible through
+         * power down and can only be executed on processors like A15 and A7
+         * that hit the cache with the C bit clear in the SCTLR register."
+        */
+        mpidr = read_cpuid_mpidr();
+        cpunr = exynos_pmu_cpunr(mpidr);
+
+        exynos_cpu_power_up(cpunr);
+}
+
 static const struct mcpm_platform_ops exynos_power_ops = {
         .power_up               = exynos_power_up,
         .power_down             = exynos_power_down,
         .wait_for_powerdown     = exynos_wait_for_powerdown,
+        .suspend                = exynos_suspend,
+        .powered_up             = exynos_powered_up,
 };
 
 static void __init exynos_mcpm_usage_count_init(void)