-#ifndef __ASM_ARM_DELAY_H
-#define __ASM_ARM_DELAY_H
-
/*
- * Copyright (C) 1995 Russell King
+ * Copyright (C) 1995-2004 Russell King
*
* Delay routines, using a pre-computed "loops_per_second" value.
*/
+#ifndef __ASM_ARM_DELAY_H
+#define __ASM_ARM_DELAY_H
extern void __delay(int loops);
+/*
+ * This function intentionally does not exist; if you see references to
+ * it, it means that you're calling udelay() with an out of range value.
+ *
+ * With currently imposed limits, this means that we support a max delay
+ * of 2000us and 671 bogomips
+ */
+extern void __bad_udelay(void);
+
/*
* division by multiplication: you don't have to worry about
* loss of precision.
* first constant multiplications gets optimized away if the delay is
* a constant)
*/
-extern void udelay(unsigned long usecs);
+extern void __udelay(unsigned long usecs);
+extern void __const_udelay(unsigned long);
-static inline unsigned long muldiv(unsigned long a, unsigned long b, unsigned long c)
-{
- return a * b / c;
-}
+#define MAX_UDELAY_MS 2
-
+#define udelay(n) \
+ (__builtin_constant_p(n) ? \
+ ((n) > (MAX_UDELAY_MS * 1000) ? __bad_udelay() : \
+ __const_udelay((n) * 0x68dbul)) : \
+ __udelay(n))
#endif /* defined(_ARM_DELAY_H) */