zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/arch/arm/mach-omap2/omap-hotplug.c b/ap/os/linux/linux-3.4.x/arch/arm/mach-omap2/omap-hotplug.c
new file mode 100644
index 0000000..56c345b
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/arch/arm/mach-omap2/omap-hotplug.c
@@ -0,0 +1,72 @@
+/*
+ * OMAP4 SMP cpu-hotplug support
+ *
+ * Copyright (C) 2010 Texas Instruments, Inc.
+ * Author:
+ * Santosh Shilimkar <santosh.shilimkar@ti.com>
+ *
+ * Platform file needed for the OMAP4 SMP. This file is based on arm
+ * realview smp platform.
+ * Copyright (c) 2002 ARM Limited.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/smp.h>
+
+#include <asm/cacheflush.h>
+
+#include "common.h"
+
+#include "powerdomain.h"
+
+int platform_cpu_kill(unsigned int cpu)
+{
+ return 1;
+}
+
+/*
+ * platform-specific code to shutdown a CPU
+ * Called with IRQs disabled
+ */
+void __ref platform_cpu_die(unsigned int cpu)
+{
+ unsigned int this_cpu;
+
+ flush_cache_all();
+ dsb();
+
+ /*
+ * we're ready for shutdown now, so do it
+ */
+ if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0)
+ pr_err("Secure clear status failed\n");
+
+ for (;;) {
+ /*
+ * Enter into low power state
+ */
+ omap4_hotplug_cpu(cpu, PWRDM_POWER_OFF);
+ this_cpu = smp_processor_id();
+ if (omap_read_auxcoreboot0() == this_cpu) {
+ /*
+ * OK, proper wakeup, we're done
+ */
+ break;
+ }
+ pr_debug("CPU%u: spurious wakeup call\n", cpu);
+ }
+}
+
+int platform_cpu_disable(unsigned int cpu)
+{
+ /*
+ * we don't allow CPU 0 to be shutdown (it is still too special
+ * e.g. clock tick interrupts)
+ */
+ return cpu == 0 ? -EPERM : 0;
+}