Subject: [PATCH] ARM: rockchip: Add cpu hotplug support for RK3XXX SoCs

From: [email-masked] (Romain Perier)
Date: Thu, 17 Jul 2014 17:11:50 +0000

Adds ability to shutdown all CPUs except the first one
(since it might be special for a lot of platforms).
It is now possible to use kexec which requires such a feature.

Signed-off-by: Romain Perier <[email-masked]>
---
 arch/arm/mach-rockchip/platsmp.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/arch/arm/mach-rockchip/platsmp.c b/arch/arm/mach-rockchip/platsmp.c
index 910835d..7c1299a 100644
--- a/arch/arm/mach-rockchip/platsmp.c
+++ b/arch/arm/mach-rockchip/platsmp.c
@@ -21,6 +21,7 @@
 #include <linux/of_address.h>
 
 #include <asm/cacheflush.h>
+#include <asm/cp15.h>
 #include <asm/smp_scu.h>
 #include <asm/smp_plat.h>
 #include <asm/mach/map.h>
@@ -178,8 +179,38 @@ static void __init rockchip_smp_prepare_cpus(unsigned int max_cpus)
 		pmu_set_power_domain(0 + i, false);
 }
 
+#ifdef CONFIG_HOTPLUG_CPU
+static DECLARE_COMPLETION(cpu_died);
+
+static int rockchip_cpu_kill(unsigned int cpu)
+{
+	if (!wait_for_completion_timeout(&cpu_died, msecs_to_jiffies(1000))) {
+		pr_err("CPU%d: didn't die correctly\n", cpu);
+		return 0;
+	}
+	pmu_set_power_domain(0 + cpu, false);
+	return 1;
+}
+
+
+static void rockchip_cpu_die(unsigned int cpu)
+{
+	complete(&cpu_died);
+	flush_cache_louis();
+
+	v7_exit_coherency_flush(louis);
+
+	while(1)
+		cpu_do_idle();
+}
+#endif
+
 static struct smp_operations rockchip_smp_ops __initdata = {
 	.smp_prepare_cpus	= rockchip_smp_prepare_cpus,
 	.smp_boot_secondary	= rockchip_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+	.cpu_kill		= rockchip_cpu_kill,
+	.cpu_die		= rockchip_cpu_die,
+#endif
 };
 CPU_METHOD_OF_DECLARE(rk3066_smp, "rockchip,rk3066-smp", &rockchip_smp_ops);
-- 
1.9.1