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 | |
| parent | fe7bce5ef70105a6546dc9b5c354219b9f6ea991 (diff) | |
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>
| -rw-r--r-- | arch/powerpc/kernel/misc_32.S | 8 | ||||
| -rw-r--r-- | arch/powerpc/kernel/time.c | 28 | ||||
| -rw-r--r-- | include/asm-powerpc/delay.h | 40 |
3 files changed, 30 insertions, 46 deletions
diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S index f6d84a75ed2..624a983a967 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 070b4b458aa..de8479769bb 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) { /* diff --git a/include/asm-powerpc/delay.h b/include/asm-powerpc/delay.h index 1492aa9ab71..54fe1f4f8fd 100644 --- a/include/asm-powerpc/delay.h +++ b/include/asm-powerpc/delay.h @@ -13,43 +13,7 @@ * Anton Blanchard. */ -extern unsigned long tb_ticks_per_usec; - -#ifdef CONFIG_PPC64 -/* define these here to prevent circular dependencies */ -/* these instructions control the thread priority on multi-threaded cpus */ -#define __HMT_low() asm volatile("or 1,1,1") -#define __HMT_medium() asm volatile("or 2,2,2") -#else -#define __HMT_low() -#define __HMT_medium() -#endif - -#define __barrier() asm volatile("" ::: "memory") - -static inline unsigned long __get_tb(void) -{ - unsigned long rval; - - asm volatile("mftb %0" : "=r" (rval)); - return rval; -} - -static inline void __delay(unsigned long loops) -{ - unsigned long start = __get_tb(); - - while((__get_tb() - start) < loops) - __HMT_low(); - __HMT_medium(); - __barrier(); -} - -static inline void udelay(unsigned long usecs) -{ - unsigned long loops = tb_ticks_per_usec * usecs; - - __delay(loops); -} +extern void __delay(unsigned long loops); +extern void udelay(unsigned long usecs); #endif /* _ASM_POWERPC_DELAY_H */ |