diff options
| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2011-05-26 11:48:28 +0400 |
|---|---|---|
| committer | Heiko Carstens <heiko.carstens@de.ibm.com> | 2011-05-26 11:48:25 +0400 |
| commit | b396637841fff79e9520514e8dcbe769c20a2ea0 (patch) | |
| tree | b268ca9d099e8e7514ed72e6035c08df0fd9f8e4 /arch/s390 | |
| parent | ac5fa22fd4f27376e4ec41b44279c9992322d7ce (diff) | |
| download | linux-b396637841fff79e9520514e8dcbe769c20a2ea0.tar.xz | |
[S390] delay: implement ndelay
Implement ndelay() on s390 as well.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/delay.h | 8 | ||||
| -rw-r--r-- | arch/s390/lib/delay.c | 15 |
2 files changed, 20 insertions, 3 deletions
diff --git a/arch/s390/include/asm/delay.h b/arch/s390/include/asm/delay.h index 8a096b83f51f..0e3b35f96be1 100644 --- a/arch/s390/include/asm/delay.h +++ b/arch/s390/include/asm/delay.h @@ -14,10 +14,12 @@ #ifndef _S390_DELAY_H #define _S390_DELAY_H -extern void __udelay(unsigned long long usecs); -extern void udelay_simple(unsigned long long usecs); -extern void __delay(unsigned long loops); +void __ndelay(unsigned long long nsecs); +void __udelay(unsigned long long usecs); +void udelay_simple(unsigned long long usecs); +void __delay(unsigned long loops); +#define ndelay(n) __ndelay((unsigned long long) (n)) #define udelay(n) __udelay((unsigned long long) (n)) #define mdelay(n) __udelay((unsigned long long) (n) * 1000) diff --git a/arch/s390/lib/delay.c b/arch/s390/lib/delay.c index 0f53110e1d09..a65229d91c92 100644 --- a/arch/s390/lib/delay.c +++ b/arch/s390/lib/delay.c @@ -12,6 +12,7 @@ #include <linux/module.h> #include <linux/irqflags.h> #include <linux/interrupt.h> +#include <asm/div64.h> void __delay(unsigned long loops) { @@ -116,3 +117,17 @@ void udelay_simple(unsigned long long usecs) while (get_clock() < end) cpu_relax(); } + +void __ndelay(unsigned long long nsecs) +{ + u64 end; + + nsecs <<= 9; + do_div(nsecs, 125); + end = get_clock() + nsecs; + if (nsecs & ~0xfffUL) + __udelay(nsecs >> 12); + while (get_clock() < end) + barrier(); +} +EXPORT_SYMBOL(__ndelay); |