diff options
| author | Magnus Damm <damm@opensource.se> | 2013-09-14 15:46:25 +0200 |
|---|---|---|
| committer | Simon Horman <horms+renesas@verge.net.au> | 2013-09-30 10:56:08 +0200 |
| commit | 916d6121b5947f162979595cc1c0396192a9aa86 (patch) | |
| tree | 52475b4b21d3f709c11b89a6711847615fd3ad12 | |
| parent | ARM: shmobile: Add r8a7790 SMP support using APMU code (diff) | |
| download | linux-916d6121b5947f162979595cc1c0396192a9aa86.tar.xz linux-916d6121b5947f162979595cc1c0396192a9aa86.zip | |
ARM: shmobile: Add CPU notifier based SCU boot vector code
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>
| -rw-r--r-- | arch/arm/mach-shmobile/platsmp-scu.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/arm/mach-shmobile/platsmp-scu.c b/arch/arm/mach-shmobile/platsmp-scu.c index c96f50160be6..49ae8dfc625d 100644 --- a/arch/arm/mach-shmobile/platsmp-scu.c +++ b/arch/arm/mach-shmobile/platsmp-scu.c @@ -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) |