Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input

[sfrench/cifs-2.6.git] / arch / arm / mach-imx / hotplug.c

diff --git a/arch/arm/mach-imx/hotplug.c b/arch/arm/mach-imx/hotplug.c
index 89493abd497c61f67e37a8eea984e517431f224a..20ed2d56c1af6a3109ff3ea10843cda25d2a289e 100644 (file)
--- a/arch/arm/mach-imx/hotplug.c
+++ b/arch/arm/mach-imx/hotplug.c
@@ -12,6 +12,7 @@
 
 #include <linux/errno.h>
 #include <asm/cacheflush.h>
+#include <asm/cp15.h>
 #include <mach/common.h>
 
 int platform_cpu_kill(unsigned int cpu)
@@ -19,6 +20,44 @@ int platform_cpu_kill(unsigned int cpu)
        return 1;
 }
 
+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"
+       /*
+        * Turn off coherency
+        */
+       "       mrc     p15, 0, %0, c1, c0, 1\n"
+       "       bic     %0, %0, %3\n"
+       "       mcr     p15, 0, %0, c1, c0, 1\n"
+       "       mrc     p15, 0, %0, c1, c0, 0\n"
+       "       bic     %0, %0, %2\n"
+       "       mcr     p15, 0, %0, c1, c0, 0\n"
+         : "=&r" (v)
+         : "r" (0), "Ir" (CR_C), "Ir" (0x40)
+         : "cc");
+}
+
+static inline void cpu_leave_lowpower(void)
+{
+       unsigned int v;
+
+       asm volatile(
+               "mrc    p15, 0, %0, c1, c0, 0\n"
+       "       orr     %0, %0, %1\n"
+       "       mcr     p15, 0, %0, c1, c0, 0\n"
+       "       mrc     p15, 0, %0, c1, c0, 1\n"
+       "       orr     %0, %0, %2\n"
+       "       mcr     p15, 0, %0, c1, c0, 1\n"
+         : "=&r" (v)
+         : "Ir" (CR_C), "Ir" (0x40)
+         : "cc");
+}
+
 /*
  * platform-specific code to shutdown a CPU
  *
@@ -26,9 +65,10 @@ int platform_cpu_kill(unsigned int cpu)
  */
 void platform_cpu_die(unsigned int cpu)
 {
-       flush_cache_all();
+       cpu_enter_lowpower();
        imx_enable_cpu(cpu, false);
        cpu_do_idle();
+       cpu_leave_lowpower();
 
        /* We should never return from idle */
        panic("cpu %d unexpectedly exit from shutdown\n", cpu);