diff options
Diffstat (limited to 'arch/arm/include/asm/delay.h')
| -rw-r--r-- | arch/arm/include/asm/delay.h | 32 |
1 files changed, 25 insertions, 7 deletions
diff --git a/arch/arm/include/asm/delay.h b/arch/arm/include/asm/delay.h index b2deda181549..dc6145120de3 100644 --- a/arch/arm/include/asm/delay.h +++ b/arch/arm/include/asm/delay.h @@ -6,9 +6,22 @@ #ifndef __ASM_ARM_DELAY_H #define __ASM_ARM_DELAY_H +#include <asm/memory.h> #include <asm/param.h> /* HZ */ -extern void __delay(int loops); +#define MAX_UDELAY_MS 2 +#define UDELAY_MULT ((UL(2199023) * HZ) >> 11) +#define UDELAY_SHIFT 30 + +#ifndef __ASSEMBLY__ + +extern struct arm_delay_ops { + void (*delay)(unsigned long); + void (*const_udelay)(unsigned long); + void (*udelay)(unsigned long); +} arm_delay_ops; + +#define __delay(n) arm_delay_ops.delay(n) /* * This function intentionally does not exist; if you see references to @@ -23,22 +36,27 @@ extern void __bad_udelay(void); * division by multiplication: you don't have to worry about * loss of precision. * - * Use only for very small delays ( < 1 msec). Should probably use a + * Use only for very small delays ( < 2 msec). Should probably use a * lookup table, really, as the multiplications take much too long with * short delays. This is a "reasonable" implementation, though (and the * first constant multiplications gets optimized away if the delay is * a constant) */ -extern void __udelay(unsigned long usecs); -extern void __const_udelay(unsigned long); - -#define MAX_UDELAY_MS 2 +#define __udelay(n) arm_delay_ops.udelay(n) +#define __const_udelay(n) arm_delay_ops.const_udelay(n) #define udelay(n) \ (__builtin_constant_p(n) ? \ ((n) > (MAX_UDELAY_MS * 1000) ? __bad_udelay() : \ - __const_udelay((n) * ((2199023U*HZ)>>11))) : \ + __const_udelay((n) * UDELAY_MULT)) : \ __udelay(n)) +/* Loop-based definitions for assembly code. */ +extern void __loop_delay(unsigned long loops); +extern void __loop_udelay(unsigned long usecs); +extern void __loop_const_udelay(unsigned long); + +#endif /* __ASSEMBLY__ */ + #endif /* defined(_ARM_DELAY_H) */ |