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authorShawn Guo <shawn.guo@linaro.org>2011-09-06 14:59:40 +0800
committerArnd Bergmann <arnd@arndb.de>2011-10-31 14:26:24 +0100
commit69c31b7a6e9cd4654ed0bfc7e70b4d7076a5cdb3 (patch)
tree2f0581360d423e9d472a4c163e91babde57cd167 /arch/arm/mach-imx/hotplug.c
parent9fbbe6890c88aa332efe61d5894108dd8b932530 (diff)
downloadop-kernel-dev-69c31b7a6e9cd4654ed0bfc7e70b4d7076a5cdb3.zip
op-kernel-dev-69c31b7a6e9cd4654ed0bfc7e70b4d7076a5cdb3.tar.gz
arm/imx6q: add smp and cpu hotplug support
It adds smp and cpu hotplug support for imx6q. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Diffstat (limited to 'arch/arm/mach-imx/hotplug.c')
-rw-r--r--arch/arm/mach-imx/hotplug.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/hotplug.c b/arch/arm/mach-imx/hotplug.c
new file mode 100644
index 0000000..89493ab
--- /dev/null
+++ b/arch/arm/mach-imx/hotplug.c
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2011 Freescale Semiconductor, Inc.
+ * Copyright 2011 Linaro Ltd.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/errno.h>
+#include <asm/cacheflush.h>
+#include <mach/common.h>
+
+int platform_cpu_kill(unsigned int cpu)
+{
+ return 1;
+}
+
+/*
+ * platform-specific code to shutdown a CPU
+ *
+ * Called with IRQs disabled
+ */
+void platform_cpu_die(unsigned int cpu)
+{
+ flush_cache_all();
+ imx_enable_cpu(cpu, false);
+ cpu_do_idle();
+
+ /* We should never return from idle */
+ panic("cpu %d unexpectedly exit from shutdown\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;
+}
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