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| author |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2009-10-06 10:34:05 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2009-10-06 10:35:08 +0200 |
| commit | 0cd6a403e8f86bb24975e4c16ce640a063475515 (patch) | |
| tree | c1231230d8407da6149502fbfc9f5152049ef0e1 /arch | |
| parent | [S390] Fix enabled udelay for short delays. (diff) | |
| download | linux-dev-0cd6a403e8f86bb24975e4c16ce640a063475515.tar.xz linux-dev-0cd6a403e8f86bb24975e4c16ce640a063475515.zip | |
[S390] Provide arch specific mdelay implementation.
Use an own implementation instead of the common code udelay loop.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/s390/include/asm/delay.h | 7 | ||||
| -rw-r--r-- | arch/s390/lib/delay.c | 14 |
2 files changed, 11 insertions, 10 deletions
diff --git a/arch/s390/include/asm/delay.h b/arch/s390/include/asm/delay.h index a356c958e260..8a096b83f51f 100644 --- a/arch/s390/include/asm/delay.h +++ b/arch/s390/include/asm/delay.h @@ -14,10 +14,11 @@ #ifndef _S390_DELAY_H #define _S390_DELAY_H -extern void __udelay(unsigned long usecs); -extern void udelay_simple(unsigned long usecs); +extern void __udelay(unsigned long long usecs); +extern void udelay_simple(unsigned long long usecs); extern void __delay(unsigned long loops); -#define udelay(n) __udelay(n) +#define udelay(n) __udelay((unsigned long long) (n)) +#define mdelay(n) __udelay((unsigned long long) (n) * 1000) #endif /* defined(_S390_DELAY_H) */ diff --git a/arch/s390/lib/delay.c b/arch/s390/lib/delay.c index 2c3094342789..752b362bf651 100644 --- a/arch/s390/lib/delay.c +++ b/arch/s390/lib/delay.c @@ -25,13 +25,13 @@ void __delay(unsigned long loops) asm volatile("0: brct %0,0b" : : "d" ((loops/2) + 1)); } -static void __udelay_disabled(unsigned long usecs) +static void __udelay_disabled(unsigned long long usecs) { unsigned long mask, cr0, cr0_saved; u64 clock_saved; clock_saved = local_tick_disable(); - set_clock_comparator(get_clock() + ((u64) usecs << 12)); + set_clock_comparator(get_clock() + (usecs << 12)); __ctl_store(cr0_saved, 0, 0); cr0 = (cr0_saved & 0xffff00e0) | 0x00000800; __ctl_load(cr0 , 0, 0); @@ -46,14 +46,14 @@ static void __udelay_disabled(unsigned long usecs) set_clock_comparator(S390_lowcore.clock_comparator); } -static void __udelay_enabled(unsigned long usecs) +static void __udelay_enabled(unsigned long long usecs) { unsigned long mask; u64 clock_saved; u64 end; mask = psw_kernel_bits | PSW_MASK_WAIT | PSW_MASK_EXT | PSW_MASK_IO; - end = get_clock() + ((u64) usecs << 12); + end = get_clock() + (usecs << 12); do { clock_saved = 0; if (end < S390_lowcore.clock_comparator) { @@ -72,7 +72,7 @@ static void __udelay_enabled(unsigned long usecs) /* * Waits for 'usecs' microseconds using the TOD clock comparator. */ -void __udelay(unsigned long usecs) +void __udelay(unsigned long long usecs) { unsigned long flags; @@ -106,11 +106,11 @@ EXPORT_SYMBOL(__udelay); * Simple udelay variant. To be used on startup and reboot * when the interrupt handler isn't working. */ -void udelay_simple(unsigned long usecs) +void udelay_simple(unsigned long long usecs) { u64 end; - end = get_clock() + ((u64) usecs << 12); + end = get_clock() + (usecs << 12); while (get_clock() < end) cpu_relax(); } |