/* * include/asm-xtensa/delay.h * * 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) 2001 - 2005 Tensilica Inc. * */ #ifndef _XTENSA_DELAY_H#define _XTENSA_DELAY_H #include <asm/timex.h>#include <asm/param.h> extern unsigned long loops_per_jiffy; static inline void __delay(unsigned long loops){	if (__builtin_constant_p(loops) && loops < 2)		__asm__ __volatile__ ("nop");	else if (loops >= 2)		/* 2 cycles per loop. */		__asm__ __volatile__ ("1: addi %0, %0, -2; bgeui %0, 2, 1b"				: "+r" (loops));} /* Undefined function to get compile-time error */void __bad_udelay(void);void __bad_ndelay(void); #define __MAX_UDELAY 30000#define __MAX_NDELAY 30000 static inline void __udelay(unsigned long usecs){	unsigned long start = get_ccount();	unsigned long cycles = (usecs * (ccount_freq >> 15)) >> 5; 	/* Note: all variables are unsigned (can wrap around)! */	while (((unsigned long)get_ccount()) - start < cycles)		cpu_relax();} static inline void udelay(unsigned long usec){	if (__builtin_constant_p(usec) && usec >= __MAX_UDELAY)		__bad_udelay();	else		__udelay(usec);} static inline void __ndelay(unsigned long nsec){	/*	 * Inner shift makes sure multiplication doesn't overflow	 * for legitimate nsec values	 */	unsigned long cycles = (nsec * (ccount_freq >> 15)) >> 15;	__delay(cycles);} #define ndelay(n) ndelay(n) static inline void ndelay(unsigned long nsec){	if (__builtin_constant_p(nsec) && nsec >= __MAX_NDELAY)		__bad_ndelay();	else		__ndelay(nsec);} #endif