1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
/*
|
|
* include/asm-v850/delay.h -- Delay routines, using a pre-computed
|
|
* "loops_per_second" value
|
|
*
|
|
* Copyright (C) 2001,03 NEC Corporation
|
|
* Copyright (C) 2001,03 Miles Bader <miles@gnu.org>
|
|
* Copyright (C) 1994 Hamish Macdonald
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef __V850_DELAY_H__
|
|
#define __V850_DELAY_H__
|
|
|
|
#include <asm/param.h>
|
|
|
|
extern __inline__ void __delay(unsigned long loops)
|
|
{
|
|
if (loops)
|
|
__asm__ __volatile__ ("1: add -1, %0; bnz 1b"
|
|
: "=r" (loops) : "0" (loops));
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
*/
|
|
|
|
extern unsigned long loops_per_jiffy;
|
|
|
|
extern __inline__ void udelay(unsigned long usecs)
|
|
{
|
|
register unsigned long full_loops, part_loops;
|
|
|
|
full_loops = ((usecs * HZ) / 1000000) * loops_per_jiffy;
|
|
usecs %= (1000000 / HZ);
|
|
part_loops = (usecs * HZ * loops_per_jiffy) / 1000000;
|
|
|
|
__delay(full_loops + part_loops);
|
|
}
|
|
|
|
#endif /* __V850_DELAY_H__ */
|