| * delay.h - delay functions |
| * Copyright (c) 2004-2007 Analog Devices Inc. |
| * Licensed under the GPL-2 or later. |
| #include <asm/mach/anomaly.h> |
| static inline void __delay(unsigned long loops) |
| /* Interrupted loads to loop registers -> bad */ |
| "LSETUP (1f,1f) LC0 = %1;" |
| /* We take advantage of the fact that LC0 is 0 at |
| * the end of the loop. Otherwise we'd need some |
| * NOPs after the CLI here. |
| "LSETUP(1f, 1f) LC0 = %0;" |
| #include <linux/param.h> /* needed for HZ */ |
| * Use only for very small delays ( < 1 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 |
| static inline void udelay(unsigned long usecs) |
| extern unsigned long loops_per_jiffy; |
| __delay(usecs * loops_per_jiffy / (1000000 / HZ)); |