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[SPARC64]: More sensible udelay implementation.

Browse source 
Take a page from the powerpc folks and just calculate the
delay factor directly.

Since frequency scaling chips use a system-tick register,
the value is going to be the same system-wide.

Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
David S. Miller 2007-07-14 02:23:37 -07:00
commit 8b99cfb8cc
10 changed files with 31 additions and 125 deletions
Download patch file Download diff file Expand all files Collapse all files

5
include/asm-sparc64/bugs.h
View file

@ -4,12 +4,7 @@
*/
#include <asm/sstate.h>
extern unsigned long loops_per_jiffy;
static void __init check_bugs(void)
{
#ifndef CONFIG_SMP
cpu_data(0).udelay_val = loops_per_jiffy;
#endif
sstate_running();
}

2
include/asm-sparc64/cpudata.h
View file

@ -19,7 +19,7 @@ typedef struct {
unsigned int __softirq_pending; /* must be 1st, see rtrap.S */
unsigned int __pad0;
unsigned long clock_tick; /* %tick's per second */
unsigned long udelay_val;
unsigned long __pad;
unsigned int __pad1;
unsigned int __pad2;

32
include/asm-sparc64/delay.h
View file

@ -1,37 +1,17 @@
/* delay.h: Linux delay routines on sparc64.
*
* Copyright (C) 1996, 2004 David S. Miller (davem@davemloft.net).
*
* Based heavily upon x86 variant which is:
* Copyright (C) 1993 Linus Torvalds
*
* Delay routines calling functions in arch/sparc64/lib/delay.c
* Copyright (C) 1996, 2004, 2007 David S. Miller (davem@davemloft.net).
*/
#ifndef __SPARC64_DELAY_H
#define __SPARC64_DELAY_H
#include <linux/param.h>
#include <asm/cpudata.h>
#ifndef _SPARC64_DELAY_H
#define _SPARC64_DELAY_H
#ifndef __ASSEMBLY__
extern void __bad_udelay(void);
extern void __bad_ndelay(void);
extern void __udelay(unsigned long usecs);
extern void __ndelay(unsigned long nsecs);
extern void __const_udelay(unsigned long usecs);
extern void __delay(unsigned long loops);
#define udelay(n) (__builtin_constant_p(n) ? \
((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \
__udelay(n))
#define ndelay(n) (__builtin_constant_p(n) ? \
((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \
__ndelay(n))
extern void udelay(unsigned long usecs);
#define mdelay(n) udelay((n) * 1000)
#endif /* !__ASSEMBLY__ */
#endif /* defined(__SPARC64_DELAY_H) */
#endif /* _SPARC64_DELAY_H */