e69cc92788
Move arch headers from include/asm-frv/ to arch/frv/include/asm/. Signed-off-by: David Howells <dhowells@redhat.com>
51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
/* delay.h: FRV delay code
|
|
*
|
|
* Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef _ASM_DELAY_H
|
|
#define _ASM_DELAY_H
|
|
|
|
#include <asm/param.h>
|
|
#include <asm/timer-regs.h>
|
|
|
|
/*
|
|
* delay loop - runs at __core_clock_speed_HZ / 2 [there are 2 insns in the loop]
|
|
*/
|
|
extern unsigned long __delay_loops_MHz;
|
|
|
|
static inline void __delay(unsigned long loops)
|
|
{
|
|
asm volatile("1: subicc %0,#1,%0,icc0 \n"
|
|
" bnc icc0,#2,1b \n"
|
|
: "=r" (loops)
|
|
: "0" (loops)
|
|
: "icc0"
|
|
);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
static inline void udelay(unsigned long usecs)
|
|
{
|
|
__delay(usecs * __delay_loops_MHz);
|
|
}
|
|
|
|
#define ndelay(n) udelay((n) * 5)
|
|
|
|
#endif /* _ASM_DELAY_H */
|