Naively enable some performance counters.HEADpandaboard-litmus

1 files changed, 14 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/board-omap4panda.c b/arch/arm/mach-omap2/board-omap4panda.c
index ecb59588e47..b37d395407a 100644
--- a/arch/arm/mach-omap2/board-omap4panda.c
+++ b/arch/arm/mach-omap2/board-omap4panda.c
@@ -737,6 +737,19 @@ static int omap_panda_netdev_event(struct notifier_block *this,
         return NOTIFY_DONE;
 }
 
+#ifdef CONFIG_HW_PERF_EVENTS
+#define enable_perf_counters() do { } while (0)
+#else
+static void __init enable_perf_counters(void)
+{
+        /* enable user-mode access to the performance counter */
+        asm volatile("mcr p15, 0, %0, c9, c14, 0" : : "r" (1));
+
+        /* disable counter overflow interrupts (just in case) */
+        asm volatile("mcr p15, 0, %0, c9, c14, 2" : : "r" (0x8000000f));
+}
+#endif
+
 static struct notifier_block omap_panda_netdev_notifier = {
         .notifier_call = omap_panda_netdev_event,
         .priority = 1,
@@ -765,6 +778,7 @@ static void __init omap4_panda_init(void)
         omap4_ehci_init();
         usb_musb_init(&musb_board_data);
         omap4_panda_display_init();
+        enable_perf_counters();
 }
 
 static void __init omap4_panda_map_io(void)