From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- arch/blackfin/include/asm/delay.h | 51 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 arch/blackfin/include/asm/delay.h (limited to 'arch/blackfin/include/asm/delay.h') diff --git a/arch/blackfin/include/asm/delay.h b/arch/blackfin/include/asm/delay.h new file mode 100644 index 000000000..171d8deb0 --- /dev/null +++ b/arch/blackfin/include/asm/delay.h @@ -0,0 +1,51 @@ +/* + * delay.h - delay functions + * + * Copyright (c) 2004-2007 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#ifndef __ASM_DELAY_H__ +#define __ASM_DELAY_H__ + +#include + +static inline void __delay(unsigned long loops) +{ +__asm__ __volatile__ ( + "LSETUP(1f, 1f) LC0 = %0;" + "1: NOP;" + : + : "a" (loops) + : "LT0", "LB0", "LC0" + ); +} + +#include /* needed for HZ */ + +/* + * close approximation borrowed from m68knommu to avoid 64-bit math + */ + +#define HZSCALE (268435456 / (1000000/HZ)) + +static inline unsigned long __to_delay(unsigned long scale) +{ + extern unsigned long loops_per_jiffy; + return (((scale * HZSCALE) >> 11) * (loops_per_jiffy >> 11)) >> 6; +} + +static inline void udelay(unsigned long usecs) +{ + __delay(__to_delay(usecs)); +} + +static inline void ndelay(unsigned long nsecs) +{ + __delay(__to_delay(1) * nsecs / 1000); +} + +#define ndelay ndelay + +#endif -- cgit v1.2.3-54-g00ecf