diff options
Diffstat (limited to 'arch/arm/mach-imx/hotplug.c')
| -rw-r--r-- | arch/arm/mach-imx/hotplug.c | 29 |
1 files changed, 23 insertions, 6 deletions
diff --git a/arch/arm/mach-imx/hotplug.c b/arch/arm/mach-imx/hotplug.c index b07b778dc9a..b35e99cc5e5 100644 --- a/arch/arm/mach-imx/hotplug.c +++ b/arch/arm/mach-imx/hotplug.c @@ -11,15 +11,16 @@ */ #include <linux/errno.h> -#include <asm/cacheflush.h> +#include <linux/jiffies.h> #include <asm/cp15.h> -#include <mach/common.h> +#include <asm/proc-fns.h> + +#include "common.h" static inline void cpu_enter_lowpower(void) { unsigned int v; - flush_cache_all(); asm volatile( "mcr p15, 0, %1, c7, c5, 0\n" " mcr p15, 0, %1, c7, c10, 4\n" @@ -45,9 +46,25 @@ static inline void cpu_enter_lowpower(void) void imx_cpu_die(unsigned int cpu) { cpu_enter_lowpower(); - imx_enable_cpu(cpu, false); + /* + * We use the cpu jumping argument register to sync with + * imx_cpu_kill() which is running on cpu0 and waiting for + * the register being cleared to kill the cpu. + */ + imx_set_cpu_arg(cpu, ~0); - /* spin here until hardware takes it down */ while (1) - ; + cpu_do_idle(); +} + +int imx_cpu_kill(unsigned int cpu) +{ + unsigned long timeout = jiffies + msecs_to_jiffies(50); + + while (imx_get_cpu_arg(cpu) == 0) + if (time_after(jiffies, timeout)) + return 0; + imx_enable_cpu(cpu, false); + imx_set_cpu_arg(cpu, 0); + return 1; } |