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| author | Olof Johansson <olof@lixom.net> | 2012-11-30 21:12:33 +0400 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2012-11-30 21:12:33 +0400 |
| commit | 5c1af2a7011bf719807de360cb64c2f610269a38 (patch) | |
| tree | fc4e6657d30c6eb48367c40e50c6b7428f96aaea /arch/arm/mach-exynos/hotplug.c | |
| parent | ef7848683f4de4903376638b69e6b4ac729b3ead (diff) | |
| parent | 573e5bbe653d01dc0f27e2d97754db9246b501c8 (diff) | |
| download | linux-5c1af2a7011bf719807de360cb64c2f610269a38.tar.xz | |
Merge branch 'next/pm-samsung' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into next/pm
From Kukjin Kim:
* 'next/pm-samsung' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung:
ARM: EXYNOS: Add flush_cache_all in suspend finisher
ARM: EXYNOS: Remove scu_enable from cpuidle
ARM: EXYNOS: Fix soft reboot hang after suspend/resume
ARM: EXYNOS: Add support for rtc wakeup
ARM: EXYNOS: fix the hotplug for Cortex-A15
+ Linux 3.7-rc6
Diffstat (limited to 'arch/arm/mach-exynos/hotplug.c')
| -rw-r--r-- | arch/arm/mach-exynos/hotplug.c | 45 |
1 files changed, 42 insertions, 3 deletions
diff --git a/arch/arm/mach-exynos/hotplug.c b/arch/arm/mach-exynos/hotplug.c index f4d7dd20cdac..c3f825b27947 100644 --- a/arch/arm/mach-exynos/hotplug.c +++ b/arch/arm/mach-exynos/hotplug.c @@ -20,10 +20,11 @@ #include <asm/smp_plat.h> #include <mach/regs-pmu.h> +#include <plat/cpu.h> #include "common.h" -static inline void cpu_enter_lowpower(void) +static inline void cpu_enter_lowpower_a9(void) { unsigned int v; @@ -45,6 +46,35 @@ static inline void cpu_enter_lowpower(void) : "cc"); } +static inline void cpu_enter_lowpower_a15(void) +{ + unsigned int v; + + asm volatile( + " mrc p15, 0, %0, c1, c0, 0\n" + " bic %0, %0, %1\n" + " mcr p15, 0, %0, c1, c0, 0\n" + : "=&r" (v) + : "Ir" (CR_C) + : "cc"); + + flush_cache_louis(); + + asm volatile( + /* + * Turn off coherency + */ + " mrc p15, 0, %0, c1, c0, 1\n" + " bic %0, %0, %1\n" + " mcr p15, 0, %0, c1, c0, 1\n" + : "=&r" (v) + : "Ir" (0x40) + : "cc"); + + isb(); + dsb(); +} + static inline void cpu_leave_lowpower(void) { unsigned int v; @@ -103,11 +133,20 @@ static inline void platform_do_lowpower(unsigned int cpu, int *spurious) void __ref exynos_cpu_die(unsigned int cpu) { int spurious = 0; + int primary_part = 0; /* - * we're ready for shutdown now, so do it + * we're ready for shutdown now, so do it. + * Exynos4 is A9 based while Exynos5 is A15; check the CPU part + * number by reading the Main ID register and then perform the + * appropriate sequence for entering low power. */ - cpu_enter_lowpower(); + asm("mrc p15, 0, %0, c0, c0, 0" : "=r"(primary_part) : : "cc"); + if ((primary_part & 0xfff0) == 0xc0f0) + cpu_enter_lowpower_a15(); + else + cpu_enter_lowpower_a9(); + platform_do_lowpower(cpu, &spurious); /* |