Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm / kernel / arch_timer.c

diff --git a/kernel/arch/arm/kernel/arch_timer.c b/kernel/arch/arm/kernel/arch_timer.c
new file mode 100644 (file)
index 0000000..1791f12
--- /dev/null
+++ b/kernel/arch/arm/kernel/arch_timer.c
@@ -0,0 +1,44 @@
+/*
+ *  linux/arch/arm/kernel/arch_timer.c
+ *
+ *  Copyright (C) 2011 ARM Ltd.
+ *  All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+
+#include <asm/delay.h>
+
+#include <clocksource/arm_arch_timer.h>
+
+static unsigned long arch_timer_read_counter_long(void)
+{
+       return arch_timer_read_counter();
+}
+
+static struct delay_timer arch_delay_timer;
+
+static void __init arch_timer_delay_timer_register(void)
+{
+       /* Use the architected timer for the delay loop. */
+       arch_delay_timer.read_current_timer = arch_timer_read_counter_long;
+       arch_delay_timer.freq = arch_timer_get_rate();
+       register_current_timer_delay(&arch_delay_timer);
+}
+
+int __init arch_timer_arch_init(void)
+{
+        u32 arch_timer_rate = arch_timer_get_rate();
+
+       if (arch_timer_rate == 0)
+               return -ENXIO;
+
+       arch_timer_delay_timer_register();
+
+       return 0;
+}