diff options
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/delay.h | 1 | ||||
| -rw-r--r-- | arch/s390/lib/delay.c | 13 |
2 files changed, 14 insertions, 0 deletions
diff --git a/arch/s390/include/asm/delay.h b/arch/s390/include/asm/delay.h index 7835731..a356c95 100644 --- a/arch/s390/include/asm/delay.h +++ b/arch/s390/include/asm/delay.h @@ -15,6 +15,7 @@ #define _S390_DELAY_H extern void __udelay(unsigned long usecs); +extern void udelay_simple(unsigned long usecs); extern void __delay(unsigned long loops); #define udelay(n) __udelay(n) diff --git a/arch/s390/lib/delay.c b/arch/s390/lib/delay.c index 0953cee..6ccb9fa 100644 --- a/arch/s390/lib/delay.c +++ b/arch/s390/lib/delay.c @@ -92,3 +92,16 @@ out: local_irq_restore(flags); preempt_enable(); } + +/* + * Simple udelay variant. To be used on startup and reboot + * when the interrupt handler isn't working. + */ +void udelay_simple(unsigned long usecs) +{ + u64 end; + + end = get_clock() + ((u64) usecs << 12); + while (get_clock() < end) + cpu_relax(); +} |