Merge branch 'rmobile/core' into rmobile/marzen
diff --git a/arch/arm/mach-shmobile/headsmp.S b/arch/arm/mach-shmobile/headsmp.S
index 26079d9..6ac015c 100644
--- a/arch/arm/mach-shmobile/headsmp.S
+++ b/arch/arm/mach-shmobile/headsmp.S
@@ -14,7 +14,7 @@
#include <linux/init.h>
#include <asm/memory.h>
- __INIT
+ __CPUINIT
/*
* Reset vector for secondary CPUs.
diff --git a/arch/arm/mach-shmobile/hotplug.c b/arch/arm/mach-shmobile/hotplug.c
index 238a0d9..828d22f 100644
--- a/arch/arm/mach-shmobile/hotplug.c
+++ b/arch/arm/mach-shmobile/hotplug.c
@@ -12,14 +12,43 @@
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/smp.h>
+#include <linux/cpumask.h>
+#include <linux/delay.h>
+#include <mach/common.h>
+#include <asm/cacheflush.h>
+
+static cpumask_t dead_cpus;
int platform_cpu_kill(unsigned int cpu)
{
- return 1;
+ int k;
+
+ /* this function is running on another CPU than the offline target,
+ * here we need wait for shutdown code in platform_cpu_die() to
+ * finish before asking SoC-specific code to power off the CPU core.
+ */
+ for (k = 0; k < 1000; k++) {
+ if (cpumask_test_cpu(cpu, &dead_cpus))
+ return shmobile_platform_cpu_kill(cpu);
+
+ mdelay(1);
+ }
+
+ return 0;
}
void platform_cpu_die(unsigned int cpu)
{
+ /* hardware shutdown code running on the CPU that is being offlined */
+ flush_cache_all();
+ dsb();
+
+ /* notify platform_cpu_kill() that hardware shutdown is finished */
+ cpumask_set_cpu(cpu, &dead_cpus);
+
+ /* wait for SoC code in platform_cpu_kill() to shut off CPU core
+ * power. CPU bring up starts from the reset vector.
+ */
while (1) {
/*
* here's the WFI
@@ -33,6 +62,7 @@
int platform_cpu_disable(unsigned int cpu)
{
+ cpumask_clear_cpu(cpu, &dead_cpus);
/*
* we don't allow CPU 0 to be shutdown (it is still too special
* e.g. clock tick interrupts)
diff --git a/arch/arm/mach-shmobile/include/mach/common.h b/arch/arm/mach-shmobile/include/mach/common.h
index 65e954b..304ac31 100644
--- a/arch/arm/mach-shmobile/include/mach/common.h
+++ b/arch/arm/mach-shmobile/include/mach/common.h
@@ -4,6 +4,7 @@
extern struct sys_timer shmobile_timer;
extern void shmobile_setup_console(void);
extern void shmobile_secondary_vector(void);
+extern int shmobile_platform_cpu_kill(unsigned int cpu);
struct clk;
extern int clk_init(void);
extern void shmobile_handle_irq_intc(struct pt_regs *);
diff --git a/arch/arm/mach-shmobile/platsmp.c b/arch/arm/mach-shmobile/platsmp.c
index c49a833..3f3325d 100644
--- a/arch/arm/mach-shmobile/platsmp.c
+++ b/arch/arm/mach-shmobile/platsmp.c
@@ -37,6 +37,11 @@
sh73a0_smp_prepare_cpus();
}
+int shmobile_platform_cpu_kill(unsigned int cpu)
+{
+ return 1;
+}
+
void __cpuinit platform_secondary_init(unsigned int cpu)
{
trace_hardirqs_off();