x86: unify include/asm/delay_32/64.h

Same file, except for whitespace, comment formatting and the extra
function prototype usc_tsc_delay() in _32.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

include/asm-x86/delay.h

@@ -1,5 +1,31 @@
-#ifdef CONFIG_X86_32
-# include "delay_32.h"
-#else
-# include "delay_64.h"
-#endif
+#ifndef _ASM_X86_DELAY_H
+#define _ASM_X86_DELAY_H
+
+/*
+ * Copyright (C) 1993 Linus Torvalds
+ *
+ * Delay routines calling functions in arch/x86/lib/delay.c
+ */
+
+/* Undefined functions to get compile-time errors */
+extern void __bad_udelay(void);
+extern void __bad_ndelay(void);
+
+extern void __udelay(unsigned long usecs);
+extern void __ndelay(unsigned long nsecs);
+extern void __const_udelay(unsigned long usecs);
+extern void __delay(unsigned long loops);
+
+/* 0x10c7 is 2**32 / 1000000 (rounded up) */
+#define udelay(n) (__builtin_constant_p(n) ? \
+	((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \
+	__udelay(n))
+
+/* 0x5 is 2**32 / 1000000000 (rounded up) */
+#define ndelay(n) (__builtin_constant_p(n) ? \
+	((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \
+	__ndelay(n))
+
+void use_tsc_delay(void);
+
+#endif /* _ASM_X86_DELAY_H */