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-rw-r--r--include/asm-blackfin/delay.h66
1 files changed, 42 insertions, 24 deletions
diff --git a/include/asm-blackfin/delay.h b/include/asm-blackfin/delay.h
index 52e7a10d7ff8..473a8113277f 100644
--- a/include/asm-blackfin/delay.h
+++ b/include/asm-blackfin/delay.h
@@ -1,29 +1,47 @@
1#ifndef _BLACKFIN_DELAY_H
2#define _BLACKFIN_DELAY_H
3
4static inline void __delay(unsigned long loops)
5{
6
7/* FIXME: Currently the assembler doesn't recognize Loop Register Clobbers,
8 uncomment this as soon those are implemented */
9/* 1/*
10 __asm__ __volatile__ ( "\t LSETUP (1f,1f) LC0= %0\n\t" 2 * delay.h - delay functions
11 "1:\t NOP;\n\t" 3 *
12 : :"a" (loops) 4 * Copyright (c) 2004-2007 Analog Devices Inc.
13 : "LT0","LB0","LC0"); 5 *
6 * Licensed under the GPL-2 or later.
7 */
8
9#ifndef __ASM_DELAY_H__
10#define __ASM_DELAY_H__
14 11
15*/ 12#include <asm/mach/anomaly.h>
16 13
17 __asm__ __volatile__("[--SP] = LC0;\n\t" 14static inline void __delay(unsigned long loops)
18 "[--SP] = LT0;\n\t" 15{
19 "[--SP] = LB0;\n\t" 16 if (ANOMALY_05000312) {
20 "LSETUP (1f,1f) LC0 = %0;\n\t" 17 /* Interrupted loads to loop registers -> bad */
21 "1:\t NOP;\n\t" 18 unsigned long tmp;
22 "LB0 = [SP++];\n\t" 19 __asm__ __volatile__(
23 "LT0 = [SP++];\n\t" 20 "[--SP] = LC0;"
24 "LC0 = [SP++];\n" 21 "[--SP] = LT0;"
25 : 22 "[--SP] = LB0;"
26 :"a" (loops)); 23 "LSETUP (1f,1f) LC0 = %1;"
24 "1: NOP;"
25 /* We take advantage of the fact that LC0 is 0 at
26 * the end of the loop. Otherwise we'd need some
27 * NOPs after the CLI here.
28 */
29 "CLI %0;"
30 "LB0 = [SP++];"
31 "LT0 = [SP++];"
32 "LC0 = [SP++];"
33 "STI %0;"
34 : "=d" (tmp)
35 : "a" (loops)
36 );
37 } else
38 __asm__ __volatile__ (
39 "LSETUP(1f, 1f) LC0 = %0;"
40 "1: NOP;"
41 :
42 : "a" (loops)
43 : "LT0", "LB0", "LC0"
44 );
27} 45}
28 46
29#include <linux/param.h> /* needed for HZ */ 47#include <linux/param.h> /* needed for HZ */
@@ -41,4 +59,4 @@ static inline void udelay(unsigned long usecs)
41 __delay(usecs * loops_per_jiffy / (1000000 / HZ)); 59 __delay(usecs * loops_per_jiffy / (1000000 / HZ));
42} 60}
43 61
44#endif /* defined(_BLACKFIN_DELAY_H) */ 62#endif