1 #ifndef _ASM_IA64_DELAY_H
2 #define _ASM_IA64_DELAY_H
3 
4 /*
5  * Delay routines using a pre-computed "cycles/usec" value.
6  *
7  * Copyright (C) 1998, 1999 Hewlett-Packard Co
8  *	David Mosberger-Tang <davidm@hpl.hp.com>
9  * Copyright (C) 1999 VA Linux Systems
10  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
11  * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
12  * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
13  */
14 
15 #include <linux/kernel.h>
16 #include <linux/sched.h>
17 #include <linux/compiler.h>
18 
19 #include <asm/intrinsics.h>
20 #include <asm/processor.h>
21 
22 static __inline__ void
ia64_set_itm(unsigned long val)23 ia64_set_itm (unsigned long val)
24 {
25 	ia64_setreg(_IA64_REG_CR_ITM, val);
26 	ia64_srlz_d();
27 }
28 
29 static __inline__ unsigned long
ia64_get_itm(void)30 ia64_get_itm (void)
31 {
32 	unsigned long result;
33 
34 	result = ia64_getreg(_IA64_REG_CR_ITM);
35 	ia64_srlz_d();
36 	return result;
37 }
38 
39 static __inline__ void
ia64_set_itv(unsigned long val)40 ia64_set_itv (unsigned long val)
41 {
42 	ia64_setreg(_IA64_REG_CR_ITV, val);
43 	ia64_srlz_d();
44 }
45 
46 static __inline__ unsigned long
ia64_get_itv(void)47 ia64_get_itv (void)
48 {
49 	return ia64_getreg(_IA64_REG_CR_ITV);
50 }
51 
52 static __inline__ void
ia64_set_itc(unsigned long val)53 ia64_set_itc (unsigned long val)
54 {
55 	ia64_setreg(_IA64_REG_AR_ITC, val);
56 	ia64_srlz_d();
57 }
58 
59 static __inline__ unsigned long
ia64_get_itc(void)60 ia64_get_itc (void)
61 {
62 	unsigned long result;
63 
64 	result = ia64_getreg(_IA64_REG_AR_ITC);
65 	ia64_barrier();
66 #ifdef CONFIG_ITANIUM
67 	while (unlikely((__s32) result == -1)) {
68 		result = ia64_getreg(_IA64_REG_AR_ITC);
69 		ia64_barrier();
70 	}
71 #endif
72 	return result;
73 }
74 
75 extern void ia64_delay_loop (unsigned long loops);
76 
77 static __inline__ void
__delay(unsigned long loops)78 __delay (unsigned long loops)
79 {
80 	if (unlikely(loops < 1))
81 		return;
82 
83 	ia64_delay_loop (loops - 1);
84 }
85 
86 extern void udelay (unsigned long usecs);
87 
88 #endif /* _ASM_IA64_DELAY_H */
89