Adds CPU hotplug support for Berlin SoCs (currently BG2 and BG2Q). The
CPUs are put in WFI after disabling the coherency.
Signed-off-by: Antoine Tenart <antoine.ten...@free-electrons.com>
---
arch/arm/mach-berlin/platsmp.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/arch/arm/mach-berlin/platsmp.c b/arch/arm/mach-berlin/platsmp.c
index 702e7982015a..d9c62057be76 100644
--- a/arch/arm/mach-berlin/platsmp.c
+++ b/arch/arm/mach-berlin/platsmp.c
@@ -14,6 +14,7 @@
#include <linux/of_address.h>
#include <asm/cacheflush.h>
+#include <asm/cp15.h>
#include <asm/smp_plat.h>
#include <asm/smp_scu.h>
@@ -92,8 +93,20 @@ unmap_scu:
iounmap(scu_base);
}
+#ifdef CONFIG_HOTPLUG_CPU
+static void berlin_cpu_die(unsigned int cpu)
+{
+ v7_exit_coherency_flush(louis);
+ while (1)
+ cpu_do_idle();
+}
+#endif
+
static struct smp_operations berlin_smp_ops __initdata = {
.smp_prepare_cpus = berlin_smp_prepare_cpus,
.smp_boot_secondary = berlin_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+ .cpu_die = berlin_cpu_die,
+#endif
};
CPU_METHOD_OF_DECLARE(berlin_smp, "marvell,berlin-smp", &berlin_smp_ops);
--
2.4.0
--
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