From: Changhwan Youn <[email protected]> The sequence of cpu_enter_lowpower() for Cortex-A15 is different from the sequence for Cortex-A9. This patch implements cpu_enter_lowpower() for EXYNOS5 SoC which has Cortex-A15 cores.
Signed-off-by: Changhwan Youn <[email protected]> Cc: Russell King <[email protected]> Signed-off-by: Kukjin Kim <[email protected]> --- Note, I didn't see common code for fix of hotplug for Cortex-A15. If any regarding patch, please kindly let me know, thanks. arch/arm/mach-exynos/hotplug.c | 39 +++++++++++++++++++++++++++++++++++++-- 1 files changed, 37 insertions(+), 2 deletions(-) diff --git a/arch/arm/mach-exynos/hotplug.c b/arch/arm/mach-exynos/hotplug.c index 9c17a0a..2a444b1 100644 --- a/arch/arm/mach-exynos/hotplug.c +++ b/arch/arm/mach-exynos/hotplug.c @@ -21,9 +21,11 @@ #include <mach/regs-pmu.h> +#include <plat/cpu.h> + extern volatile int pen_release; -static inline void cpu_enter_lowpower(void) +static inline void cpu_enter_lowpower_a9(void) { unsigned int v; @@ -45,6 +47,35 @@ 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_all(); + + 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; @@ -112,7 +143,11 @@ void platform_cpu_die(unsigned int cpu) /* * we're ready for shutdown now, so do it */ - cpu_enter_lowpower(); + if (soc_is_exynos5250()) + cpu_enter_lowpower_a15(); + else + cpu_enter_lowpower_a9(); + platform_do_lowpower(cpu, &spurious); /* -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
