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authorAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
committerAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
commitb4b6116a13633898cf868f2f103c96a90c4c20f8 (patch)
tree93d1b7e2cfcdf473d8d4ff3ad141fa864f8491f6 /arch/arm/mach-highbank/hotplug.c
parentedd4be777c953e5faafc80d091d3084b4343f5d3 (diff)
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fedora kernel: d9aad82f3319f3cfd1aebc01234254ef0c37ad84v3.3.2-1
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/arm/mach-highbank/hotplug.c')
-rw-r--r--arch/arm/mach-highbank/hotplug.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/arch/arm/mach-highbank/hotplug.c b/arch/arm/mach-highbank/hotplug.c
new file mode 100644
index 00000000000..977cebbea58
--- /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;
+}