98 lines
1.9 KiB
C
98 lines
1.9 KiB
C
|
#ifndef _ASM_IA64_DELAY_H
|
||
|
|
#define _ASM_IA64_DELAY_H
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Delay routines using a pre-computed "cycles/usec" value.
|
||
|
|
*
|
||
|
|
* Copyright (C) 1998, 1999 Hewlett-Packard Co
|
||
|
|
* David Mosberger-Tang <davidm@hpl.hp.com>
|
||
|
|
* Copyright (C) 1999 VA Linux Systems
|
||
|
|
* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
|
||
|
|
* Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
|
||
|
|
* Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/config.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/sched.h>
|
||
|
|
#include <linux/compiler.h>
|
||
|
|
|
||
|
|
#include <asm/intrinsics.h>
|
||
|
|
#include <asm/processor.h>
|
||
|
|
|
||
|
|
static __inline__ void
|
||
|
|
ia64_set_itm (unsigned long val)
|
||
|
|
{
|
||
|
|
ia64_setreg(_IA64_REG_CR_ITM, val);
|
||
|
|
ia64_srlz_d();
|
||
|
|
}
|
||
|
|
|
||
|
|
static __inline__ unsigned long
|
||
|
|
ia64_get_itm (void)
|
||
|
|
{
|
||
|
|
unsigned long result;
|
||
|
|
|
||
|
|
result = ia64_getreg(_IA64_REG_CR_ITM);
|
||
|
|
ia64_srlz_d();
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
static __inline__ void
|
||
|
|
ia64_set_itv (unsigned long val)
|
||
|
|
{
|
||
|
|
ia64_setreg(_IA64_REG_CR_ITV, val);
|
||
|
|
ia64_srlz_d();
|
||
|
|
}
|
||
|
|
|
||
|
|
static __inline__ unsigned long
|
||
|
|
ia64_get_itv (void)
|
||
|
|
{
|
||
|
|
return ia64_getreg(_IA64_REG_CR_ITV);
|
||
|
|
}
|
||
|
|
|
||
|
|
static __inline__ void
|
||
|
|
ia64_set_itc (unsigned long val)
|
||
|
|
{
|
||
|
|
ia64_setreg(_IA64_REG_AR_ITC, val);
|
||
|
|
ia64_srlz_d();
|
||
|
|
}
|
||
|
|
|
||
|
|
static __inline__ unsigned long
|
||
|
|
ia64_get_itc (void)
|
||
|
|
{
|
||
|
|
unsigned long result;
|
||
|
|
|
||
|
|
result = ia64_getreg(_IA64_REG_AR_ITC);
|
||
|
|
ia64_barrier();
|
||
|
|
#ifdef CONFIG_ITANIUM
|
||
|
|
while (unlikely((__s32) result == -1)) {
|
||
|
|
result = ia64_getreg(_IA64_REG_AR_ITC);
|
||
|
|
ia64_barrier();
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
extern void ia64_delay_loop (unsigned long loops);
|
||
|
|
|
||
|
|
static __inline__ void
|
||
|
|
__delay (unsigned long loops)
|
||
|
|
{
|
||
|
|
if (unlikely(loops < 1))
|
||
|
|
return;
|
||
|
|
|
||
|
|
ia64_delay_loop (loops - 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
static __inline__ void
|
||
|
|
udelay (unsigned long usecs)
|
||
|
|
{
|
||
|
|
unsigned long start = ia64_get_itc();
|
||
|
|
unsigned long cycles = usecs*local_cpu_data->cyc_per_usec;
|
||
|
|
|
||
|
|
while (ia64_get_itc() - start < cycles)
|
||
|
|
cpu_relax();
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* _ASM_IA64_DELAY_H */
|