c71861e65e
Currently the xloops calculation in ndelay() gets set to 0 when calculated with HZ=250, fix up how we do the HZ factoring in order to get this right for differing values. Signed-off-by: kogiidena <kogiidena@eggplant.ddo.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
43 lines
721 B
C
43 lines
721 B
C
/*
|
|
* Precise Delay Loops for SuperH
|
|
*
|
|
* Copyright (C) 1999 Niibe Yutaka & Kaz Kojima
|
|
*/
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/delay.h>
|
|
|
|
void __delay(unsigned long loops)
|
|
{
|
|
__asm__ __volatile__(
|
|
"tst %0, %0\n\t"
|
|
"1:\t"
|
|
"bf/s 1b\n\t"
|
|
" dt %0"
|
|
: "=r" (loops)
|
|
: "0" (loops)
|
|
: "t");
|
|
}
|
|
|
|
inline void __const_udelay(unsigned long xloops)
|
|
{
|
|
__asm__("dmulu.l %0, %2\n\t"
|
|
"sts mach, %0"
|
|
: "=r" (xloops)
|
|
: "0" (xloops),
|
|
"r" (HZ * cpu_data[raw_smp_processor_id()].loops_per_jiffy)
|
|
: "macl", "mach");
|
|
__delay(xloops);
|
|
}
|
|
|
|
void __udelay(unsigned long usecs)
|
|
{
|
|
__const_udelay(usecs * 0x000010c6); /* 2**32 / 1000000 */
|
|
}
|
|
|
|
void __ndelay(unsigned long nsecs)
|
|
{
|
|
__const_udelay(nsecs * 0x00000005);
|
|
}
|
|
|