[PATCH 45/74] SPEAr : SEV Send event to secondary CPUs
From: Viresh KUMAR <hidden>
Date: 2010-08-30 10:39:09
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
From: Vipin Kumar <redacted> The secondary CPUs have been put in a WFE(Wait for Event) state. Using SEV instruction sends an event to all CPUs. Signed-off-by: Vipin Kumar <redacted> Signed-off-by: shiraz hashim <redacted> Signed-off-by: Viresh Kumar <redacted> --- arch/arm/mach-spear13xx/include/mach/smp.h | 6 ++++++ arch/arm/mach-spear13xx/platsmp.c | 5 +++++ 2 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-spear13xx/include/mach/smp.h b/arch/arm/mach-spear13xx/include/mach/smp.h
index 6e028a1..e2e55fc 100644
--- a/arch/arm/mach-spear13xx/include/mach/smp.h
+++ b/arch/arm/mach-spear13xx/include/mach/smp.h@@ -24,6 +24,12 @@ cpunum &= 0x0F; \ }) +/* + * set_event() is used to wake up secondary core from wfe using sev. Booting + * code puts the second core into wfe(standby). + */ +#define set_event() __asm__ __volatile__ ("sev" : : : "memory") + /* We use IRQ1 as the IPI */ static inline void smp_cross_call(const struct cpumask *mask) {
diff --git a/arch/arm/mach-spear13xx/platsmp.c b/arch/arm/mach-spear13xx/platsmp.c
index 8b75d1b..73fbcdb 100644
--- a/arch/arm/mach-spear13xx/platsmp.c
+++ b/arch/arm/mach-spear13xx/platsmp.c@@ -133,6 +133,11 @@ static void __init poke_milo(void) __io_address(SPEAR13XX_SYS_LOCATION)); mb(); + + /* + * Send a 'sev' to wake the secondary core from WFE. + */ + set_event(); } /*
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1.7.2.2