fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-xtensa / delay.h
blobe1d8c9e010c1df976624ce71ea0449d6c8f47ae4
1 /*
2 * include/asm-xtensa/delay.h
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
8 * Copyright (C) 2001 - 2005 Tensilica Inc.
12 #ifndef _XTENSA_DELAY_H
13 #define _XTENSA_DELAY_H
15 #include <asm/processor.h>
16 #include <asm/param.h>
18 extern unsigned long loops_per_jiffy;
20 static inline void __delay(unsigned long loops)
22 /* 2 cycles per loop. */
23 __asm__ __volatile__ ("1: addi %0, %0, -2; bgeui %0, 2, 1b"
24 : "=r" (loops) : "0" (loops));
27 static __inline__ u32 xtensa_get_ccount(void)
29 u32 ccount;
30 asm volatile ("rsr %0, 234; # CCOUNT\n" : "=r" (ccount));
31 return ccount;
34 /* For SMP/NUMA systems, change boot_cpu_data to something like
35 * local_cpu_data->... where local_cpu_data points to the current
36 * cpu. */
38 static __inline__ void udelay (unsigned long usecs)
40 unsigned long start = xtensa_get_ccount();
41 unsigned long cycles = usecs * (loops_per_jiffy / (1000000UL / HZ));
43 /* Note: all variables are unsigned (can wrap around)! */
44 while (((unsigned long)xtensa_get_ccount()) - start < cycles)
48 #endif