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Editing: delay.h
Close
/* * include/asm-microblaze/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) 2008 Michal Simek * Copyright (C) 2007 John Williams * Copyright (C) 2006 Atmark Techno, Inc. */ #ifndef _ASM_MICROBLAZE_DELAY_H #define _ASM_MICROBLAZE_DELAY_H #include <linux/param.h> static inline void __delay(unsigned long loops) { asm volatile ("# __delay \n\t" \ "1: addi %0, %0, -1\t\n" \ "bneid %0, 1b \t\n" \ "nop \t\n" : "=r" (loops) : "0" (loops)); } /* * Note that 19 * 226 == 4294 ==~ 2^32 / 10^6, so * loops = (4294 * usecs * loops_per_jiffy * HZ) / 2^32. * * The mul instruction gives us loops = (a * b) / 2^32. * We choose a = usecs * 19 * HZ and b = loops_per_jiffy * 226 * because this lets us support a wide range of HZ and * loops_per_jiffy values without either a or b overflowing 2^32. * Thus we need usecs * HZ <= (2^32 - 1) / 19 = 226050910 and * loops_per_jiffy <= (2^32 - 1) / 226 = 19004280 * (which corresponds to ~3800 bogomips at HZ = 100). * -- paulus */ #define __MAX_UDELAY (226050910UL/HZ) /* maximum udelay argument */ #define __MAX_NDELAY (4294967295UL/HZ) /* maximum ndelay argument */ extern unsigned long loops_per_jiffy; static inline void __udelay(unsigned int x) { unsigned long long tmp = (unsigned long long)x * (unsigned long long)loops_per_jiffy \ * 226LL; unsigned loops = tmp >> 32; /* __asm__("mulxuu %0,%1,%2" : "=r" (loops) : "r" (x), "r" (loops_per_jiffy * 226)); */ __delay(loops); } extern void __bad_udelay(void); /* deliberately undefined */ extern void __bad_ndelay(void); /* deliberately undefined */ #define udelay(n) \ ({ \ if (__builtin_constant_p(n)) { \ if ((n) / __MAX_UDELAY >= 1) \ __bad_udelay(); \ else \ __udelay((n) * (19 * HZ)); \ } else { \ __udelay((n) * (19 * HZ)); \ } \ }) #define ndelay(n) \ ({ \ if (__builtin_constant_p(n)) { \ if ((n) / __MAX_NDELAY >= 1) \ __bad_ndelay(); \ else \ __udelay((n) * HZ); \ } else { \ __udelay((n) * HZ); \ } \ }) #define muldiv(a, b, c) (((a)*(b))/(c)) #endif /* _ASM_MICROBLAZE_DELAY_H */