/* * This file is subject to the terms and conditions of the GNU General Public * License.  See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1994 by Waldorf Electronics * Copyright (C) 1995 - 2000, 01, 03 by Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. */#ifndef _ASM_DELAY_H#define _ASM_DELAY_H #include <linux/param.h>#include <linux/smp.h>#include <asm/compiler.h> static inline void __delay(unsigned long loops){	if (sizeof(long) == 4)		__asm__ __volatile__ (		"	.set	noreorder				\n"		"	.align	3					\n"		"1:	bnez	%0, 1b					\n"		"	subu	%0, 1					\n"		"	.set	reorder					\n"		: "=r" (loops)		: "0" (loops));	else if (sizeof(long) == 8)		__asm__ __volatile__ (		"	.set	noreorder				\n"		"	.align	3					\n"		"1:	bnez	%0, 1b					\n"		"	dsubu	%0, 1					\n"		"	.set	reorder					\n"		: "=r" (loops)		: "0" (loops));}  /* * Division by multiplication: you don't have to worry about * loss of precision. * * Use only for very small delays ( < 1 msec).  Should probably use a * lookup table, really, as the multiplications take much too long with * short delays.  This is a "reasonable" implementation, though (and the * first constant multiplications gets optimized away if the delay is * a constant) */ static inline void __udelay(unsigned long usecs, unsigned long lpj){	unsigned long lo; 	/*	 * The rates of 128 is rounded wrongly by the catchall case	 * for 64-bit.  Excessive precission?  Probably ...	 */#if defined(CONFIG_64BIT) && (HZ == 128)	usecs *= 0x0008637bd05af6c7UL;		/* 2**64 / (1000000 / HZ) */#elif defined(CONFIG_64BIT)	usecs *= (0x8000000000000000UL / (500000 / HZ));#else /* 32-bit junk follows here */	usecs *= (unsigned long) (((0x8000000000000000ULL / (500000 / HZ)) +	                           0x80000000ULL) >> 32);#endif 	if (sizeof(long) == 4)		__asm__("multu\t%2, %3"		: "=h" (usecs), "=l" (lo)		: "r" (usecs), "r" (lpj)		: GCC_REG_ACCUM);	else if (sizeof(long) == 8)		__asm__("dmultu\t%2, %3"		: "=h" (usecs), "=l" (lo)		: "r" (usecs), "r" (lpj)		: GCC_REG_ACCUM); 	__delay(usecs);} #define __udelay_val cpu_data[raw_smp_processor_id()].udelay_val #define udelay(usecs) __udelay((usecs),__udelay_val) /* make sure "usecs *= ..." in udelay do not overflow. */#if HZ >= 1000#define MAX_UDELAY_MS	1#elif HZ <= 200#define MAX_UDELAY_MS	5#else#define MAX_UDELAY_MS	(1000 / HZ)#endif #endif /* _ASM_DELAY_H */