1 files changed, 41 insertions, 0 deletions

diff --git a/arch/arm/mach-prima2/hotplug.c b/arch/arm/mach-prima2/hotplug.c
new file mode 100644
index 000000000000..97c1ee586442
--- /dev/null
+++ b/arch/arm/mach-prima2/hotplug.c
@@ -0,0 +1,41 @@
+/*
+ * CPU hotplug support for CSR Marco dual-core SMP SoCs
+ *
+ * Copyright (c) 2012 Cambridge Silicon Radio Limited, a CSR plc group company.
+ *
+ * Licensed under GPLv2 or later.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/smp.h>
+
+#include <asm/cacheflush.h>
+#include <asm/smp_plat.h>
+
+static inline void platform_do_lowpower(unsigned int cpu)
+{
+        flush_cache_all();
+
+        /* we put the platform to just WFI */
+        for (;;) {
+                __asm__ __volatile__("dsb\n\t" "wfi\n\t"
+                        : : : "memory");
+                if (pen_release == cpu_logical_map(cpu)) {
+                        /*
+                         * OK, proper wakeup, we're done
+                         */
+                        break;
+                }
+        }
+}
+
+/*
+ * platform-specific code to shutdown a CPU
+ *
+ * Called with IRQs disabled
+ */
+void sirfsoc_cpu_die(unsigned int cpu)
+{
+        platform_do_lowpower(cpu);
+}