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ARM: shmobile: Add CPU notifier based SCU boot vector code

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Add CPU notifiers for the shared mach-shmobile SCU code
to allow removal of the shared SCU boot_secondary code.

Regarding notifiers, at CPU_UP_PREPARE time the SMP boot
vector is initialized so secondary CPU cores can boot.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Magnus Damm 2013-09-14 22:46:25 +09:00 • committed by Simon Horman
parent ad09cb8381
commit 916d6121b5
1 changed files with 24 additions and 0 deletions
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24
arch/arm/mach-shmobile/platsmp-scu.c
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@ -7,6 +7,7 @@
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/cpu.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/io.h>
@ -16,6 +17,26 @@
#include <asm/smp_scu.h>
#include <mach/common.h>
static int shmobile_smp_scu_notifier_call(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
unsigned int cpu = (long)hcpu;
switch (action) {
case CPU_UP_PREPARE:
/* For this particular CPU register SCU SMP boot vector */
shmobile_smp_hook(cpu, virt_to_phys(shmobile_boot_scu),
(unsigned long)shmobile_scu_base);
break;
};
return NOTIFY_OK;
}
static struct notifier_block shmobile_smp_scu_notifier = {
.notifier_call = shmobile_smp_scu_notifier_call,
};
void __init shmobile_smp_scu_prepare_cpus(unsigned int max_cpus)
{
/* install boot code shared by all CPUs */
@ -25,6 +46,9 @@ void __init shmobile_smp_scu_prepare_cpus(unsigned int max_cpus)
/* enable SCU and cache coherency on booting CPU */
scu_enable(shmobile_scu_base);
scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL);
/* Use CPU notifier for reset vector control */
register_cpu_notifier(&shmobile_smp_scu_notifier);
}
int shmobile_smp_scu_boot_secondary(unsigned int cpu, struct task_struct *idle)