1 /* $Id: delay.h,v 1.12.2.1 2002/02/02 02:11:52 kanoj Exp $
2 * delay.h: Linux delay routines on the V9.
3 *
4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu).
5 */
6
7 #ifndef __SPARC64_DELAY_H
8 #define __SPARC64_DELAY_H
9
10 #include <linux/config.h>
11 #include <linux/param.h>
12
13 #ifndef __ASSEMBLY__
14
15 #ifdef CONFIG_SMP
16 #include <asm/smp.h>
17 #else
18 extern unsigned long loops_per_jiffy;
19 #endif
20
__delay(unsigned long loops)21 extern __inline__ void __delay(unsigned long loops)
22 {
23 __asm__ __volatile__(
24 " b,pt %%xcc, 1f\n"
25 " cmp %0, 0\n"
26 " .align 32\n"
27 "1:\n"
28 " bne,pt %%xcc, 1b\n"
29 " subcc %0, 1, %0\n"
30 : "=&r" (loops)
31 : "0" (loops)
32 : "cc");
33 }
34
__udelay(unsigned long usecs,unsigned long lps)35 extern __inline__ void __udelay(unsigned long usecs, unsigned long lps)
36 {
37 usecs *= 0x00000000000010c6UL; /* 2**32 / 1000000 */
38
39 __asm__ __volatile__(
40 " mulx %1, %2, %0\n"
41 " srlx %0, 32, %0\n"
42 : "=r" (usecs)
43 : "r" (usecs), "r" (lps));
44
45 __delay(usecs * HZ);
46 }
47
__ndelay(unsigned long usecs,unsigned long lps)48 extern __inline__ void __ndelay(unsigned long usecs, unsigned long lps)
49 {
50 usecs *= 0x0000000000000005UL; /* 2**32 / 10000 */
51
52 __asm__ __volatile__(
53 " mulx %1, %2, %0\n"
54 " srlx %0, 32, %0\n"
55 : "=r" (usecs)
56 : "r" (usecs), "r" (lps));
57
58 __delay(usecs * HZ);
59 }
60
61 #ifdef CONFIG_SMP
62 #define __udelay_val cpu_data[smp_processor_id()].udelay_val
63 #else
64 #define __udelay_val loops_per_jiffy
65 #endif
66
67 #define udelay(usecs) __udelay((usecs),__udelay_val)
68 #define ndelay(usecs) __ndelay((usecs),__udelay_val)
69
70 #endif /* !__ASSEMBLY__ */
71
72 #endif /* defined(__SPARC64_DELAY_H) */
73