1 files changed, 51 insertions, 0 deletions
diff --git a/kernel/arch/blackfin/include/asm/delay.h b/kernel/arch/blackfin/include/asm/delay.h
new file mode 100644
index 000000000..171d8deb0
--- /dev/null
+++ b/kernel/arch/blackfin/include/asm/delay.h
@@ -0,0 +1,51 @@
+/*
+ * delay.h - delay functions
+ *
+ * Copyright (c) 2004-2007 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __ASM_DELAY_H__
+#define __ASM_DELAY_H__
+
+#include <mach/anomaly.h>
+
+static inline void __delay(unsigned long loops)
+{
+__asm__ __volatile__ (
+			"LSETUP(1f, 1f) LC0 = %0;"
+			"1: NOP;"
+			:
+			: "a" (loops)
+			: "LT0", "LB0", "LC0"
+		);
+}
+
+#include <linux/param.h>	/* needed for HZ */
+
+/*
+ * close approximation borrowed from m68knommu to avoid 64-bit math
+ */
+
+#define	HZSCALE		(268435456 / (1000000/HZ))
+
+static inline unsigned long __to_delay(unsigned long scale)
+{
+	extern unsigned long loops_per_jiffy;
+	return (((scale * HZSCALE) >> 11) * (loops_per_jiffy >> 11)) >> 6;
+}
+
+static inline void udelay(unsigned long usecs)
+{
+	__delay(__to_delay(usecs));
+}
+
+static inline void ndelay(unsigned long nsecs)
+{
+	__delay(__to_delay(1) * nsecs / 1000);
+}
+
+#define ndelay ndelay
+
+#endif