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authorMarc Zyngier <marc.zyngier@arm.com>2011-09-08 13:15:22 +0100
committerArnd Bergmann <arnd@arndb.de>2012-09-14 11:14:58 +0200
commita62580e58065dc00430b16ced6e7a00837b8323f (patch)
treed3ec9d533870478e86a2cb5f0fefc937fca7cbfc /arch/arm/mach-shmobile/smp-sh73a0.c
parent5ac21a943e4052ef6743b09b6a06fbb683a3519d (diff)
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ARM: SoC: convert shmobile SMP to SMP operations
Convert shmobile SMP platforms to use struct smp_operations to provide their SMP and CPU hotplug operations. Cc: Paul Mundt <lethal@linux-sh.org> Cc: Magnus Damm <magnus.damm@gmail.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arm/mach-shmobile/smp-sh73a0.c')
-rw-r--r--arch/arm/mach-shmobile/smp-sh73a0.c48
1 files changed, 44 insertions, 4 deletions
diff --git a/arch/arm/mach-shmobile/smp-sh73a0.c b/arch/arm/mach-shmobile/smp-sh73a0.c
index e36c41c4ab40..624f00f70abf 100644
--- a/arch/arm/mach-shmobile/smp-sh73a0.c
+++ b/arch/arm/mach-shmobile/smp-sh73a0.c
@@ -22,8 +22,10 @@
#include <linux/smp.h>
#include <linux/spinlock.h>
#include <linux/io.h>
+#include <linux/delay.h>
#include <mach/common.h>
#include <asm/smp_plat.h>
+#include <mach/sh73a0.h>
#include <asm/smp_scu.h>
#include <asm/smp_twd.h>
#include <asm/hardware/gic.h>
@@ -64,19 +66,19 @@ static void modify_scu_cpu_psr(unsigned long set, unsigned long clr)
__raw_writel(tmp, scu_base + 8);
}
-unsigned int __init sh73a0_get_core_count(void)
+static unsigned int __init sh73a0_get_core_count(void)
{
void __iomem *scu_base = scu_base_addr();
return scu_get_core_count(scu_base);
}
-void __cpuinit sh73a0_secondary_init(unsigned int cpu)
+static void __cpuinit sh73a0_secondary_init(unsigned int cpu)
{
gic_secondary_init(0);
}
-int __cpuinit sh73a0_boot_secondary(unsigned int cpu)
+static int __cpuinit sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
cpu = cpu_logical_map(cpu);
@@ -91,7 +93,7 @@ int __cpuinit sh73a0_boot_secondary(unsigned int cpu)
return 0;
}
-void __init sh73a0_smp_prepare_cpus(void)
+static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
{
int cpu = cpu_logical_map(0);
@@ -104,3 +106,41 @@ void __init sh73a0_smp_prepare_cpus(void)
/* enable cache coherency on CPU0 */
modify_scu_cpu_psr(0, 3 << (cpu * 8));
}
+
+static void __init sh73a0_smp_init_cpus(void)
+{
+ unsigned int ncores = sh73a0_get_core_count();
+
+ shmobile_smp_init_cpus(ncores);
+}
+
+static int __maybe_unused sh73a0_cpu_kill(unsigned int cpu)
+{
+ 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 (shmobile_cpu_is_dead(cpu))
+ return 1;
+
+ mdelay(1);
+ }
+
+ return 0;
+}
+
+
+struct smp_operations sh73a0_smp_ops __initdata = {
+ .smp_init_cpus = sh73a0_smp_init_cpus,
+ .smp_prepare_cpus = sh73a0_smp_prepare_cpus,
+ .smp_secondary_init = sh73a0_secondary_init,
+ .smp_boot_secondary = sh73a0_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+ .cpu_kill = sh73a0_cpu_kill,
+ .cpu_die = shmobile_cpu_die,
+ .cpu_disable = shmobile_cpu_disable,
+#endif
+};