diff options
| author | Paul Mackerras <paulus@samba.org> | 2005-11-18 13:44:17 +1100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2005-11-18 14:08:12 +1100 |
| commit | 6defa38b3754c84cd3449447477aed81ea979407 (patch) | |
| tree | b5f40628d6fd9001470aa2f9a8fa3f2ed08862c6 /arch/powerpc | |
| parent | fe7bce5ef70105a6546dc9b5c354219b9f6ea991 (diff) | |
| download | linux-6defa38b3754c84cd3449447477aed81ea979407.tar.bz2 | |
powerpc: Fix delay functions for 601 processors
My earlier merge of delay.h introduced a timebase-based udelay for
32-bit machines but also broke the 601, which doesn't have the
timebase register. This fixes it by using the 601's RTC register on
the 601, and also moves __delay() and udelay() to be out-of-line in
arch/powerpc/kernel/time.c. These functions aren't really performance
critical, after all.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/kernel/misc_32.S | 8 | ||||
| -rw-r--r-- | arch/powerpc/kernel/time.c | 28 |
2 files changed, 28 insertions, 8 deletions
diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S index f6d84a75ed26..624a983a9676 100644 --- a/arch/powerpc/kernel/misc_32.S +++ b/arch/powerpc/kernel/misc_32.S @@ -27,14 +27,6 @@ .text - .align 5 -_GLOBAL(__delay) - cmpwi 0,r3,0 - mtctr r3 - beqlr -1: bdnz 1b - blr - /* * This returns the high 64 bits of the product of two 64-bit numbers. */ diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index 070b4b458aaf..de8479769bb7 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -130,6 +130,34 @@ unsigned long tb_last_stamp; */ DEFINE_PER_CPU(unsigned long, last_jiffy); +void __delay(unsigned long loops) +{ + unsigned long start; + int diff; + + if (__USE_RTC()) { + start = get_rtcl(); + do { + /* the RTCL register wraps at 1000000000 */ + diff = get_rtcl() - start; + if (diff < 0) + diff += 1000000000; + } while (diff < loops); + } else { + start = get_tbl(); + while (get_tbl() - start < loops) + HMT_low(); + HMT_medium(); + } +} +EXPORT_SYMBOL(__delay); + +void udelay(unsigned long usecs) +{ + __delay(tb_ticks_per_usec * usecs); +} +EXPORT_SYMBOL(udelay); + static __inline__ void timer_check_rtc(void) { /* |