| /* |
| * include/asm-xtensa/delay.h |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 2001 - 2005 Tensilica Inc. |
| * |
| */ |
| |
| #ifndef _XTENSA_DELAY_H |
| #define _XTENSA_DELAY_H |
| |
| #include <asm/timex.h> |
| #include <asm/param.h> |
| |
| extern unsigned long loops_per_jiffy; |
| |
| static inline void __delay(unsigned long loops) |
| { |
| /* 2 cycles per loop. */ |
| __asm__ __volatile__ ("1: addi %0, %0, -2; bgeui %0, 2, 1b" |
| : "=r" (loops) : "0" (loops)); |
| } |
| |
| /* For SMP/NUMA systems, change boot_cpu_data to something like |
| * local_cpu_data->... where local_cpu_data points to the current |
| * cpu. */ |
| |
| static __inline__ void udelay (unsigned long usecs) |
| { |
| unsigned long start = get_ccount(); |
| unsigned long cycles = usecs * (loops_per_jiffy / (1000000UL / HZ)); |
| |
| /* Note: all variables are unsigned (can wrap around)! */ |
| while (((unsigned long)get_ccount()) - start < cycles) |
| ; |
| } |
| |
| #endif |
