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authorMartin Bogomolni <martin@calxeda.com>2011-06-14 01:50:33 +0400
committerArnd Bergmann <arnd@arndb.de>2011-10-31 17:14:04 +0400
commit9680b3d04d27ed90479eb84d2054ddd3deb83d5e (patch)
tree01a4e6e83174fcf3c78df901a8f8aacee7c7285e /arch/arm
parent6738845783e9113feec22f20834d0e956808da3b (diff)
downloadlinux-9680b3d04d27ed90479eb84d2054ddd3deb83d5e.tar.xz
ARM: highbank: Add cpu hotplug support
This adds cpu hotplug for highbank. On highbank, a core is always reset and boots up the same path as a cold boot. Signed-off-by: Martin Bogomolni <martin@calxeda.com> Signed-off-by: Rob Herring <rob.herring@calxeda.com> Reviewed-by: Jamie Iles <jamie@jamieiles.com> Reviewed-by: Shawn Guo <shawn.guo@linaro.org>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/mach-highbank/Makefile1
-rw-r--r--arch/arm/mach-highbank/hotplug.c56
2 files changed, 57 insertions, 0 deletions
diff --git a/arch/arm/mach-highbank/Makefile b/arch/arm/mach-highbank/Makefile
index 89c736ff047f..c45078f820ae 100644
--- a/arch/arm/mach-highbank/Makefile
+++ b/arch/arm/mach-highbank/Makefile
@@ -2,3 +2,4 @@ obj-y := clock.o highbank.o system.o
obj-$(CONFIG_DEBUG_HIGHBANK_UART) += lluart.o
obj-$(CONFIG_SMP) += platsmp.o
obj-$(CONFIG_LOCAL_TIMERS) += localtimer.o
+obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o
diff --git a/arch/arm/mach-highbank/hotplug.c b/arch/arm/mach-highbank/hotplug.c
new file mode 100644
index 000000000000..977cebbea580
--- /dev/null
+++ b/arch/arm/mach-highbank/hotplug.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2011 Calxeda, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/smp.h>
+
+#include <asm/smp_scu.h>
+#include <asm/cacheflush.h>
+
+#include "core.h"
+
+extern void secondary_startup(void);
+
+int platform_cpu_kill(unsigned int cpu)
+{
+ return 1;
+}
+
+/*
+ * platform-specific code to shutdown a CPU
+ *
+ */
+void platform_cpu_die(unsigned int cpu)
+{
+ flush_cache_all();
+
+ highbank_set_cpu_jump(cpu, secondary_startup);
+ scu_power_mode(scu_base_addr, SCU_PM_POWEROFF);
+
+ cpu_do_idle();
+
+ /* We should never return from idle */
+ panic("highbank: cpu %d unexpectedly exit from shutdown\n", cpu);
+}
+
+int platform_cpu_disable(unsigned int cpu)
+{
+ /*
+ * CPU0 should not be shut down via hotplug. cpu_idle can WFI
+ * or a proper shutdown or hibernate should be used.
+ */
+ return cpu == 0 ? -EPERM : 0;
+}