1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_IA64_DELAY_H
3 #define _ASM_IA64_DELAY_H
4 
5 /*
6  * Delay routines using a pre-computed "cycles/usec" value.
7  *
8  * Copyright (C) 1998, 1999 Hewlett-Packard Co
9  *	David Mosberger-Tang <davidm@hpl.hp.com>
10  * Copyright (C) 1999 VA Linux Systems
11  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
12  * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
13  * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
14  */
15 
16 #include <linux/kernel.h>
17 #include <linux/sched.h>
18 #include <linux/compiler.h>
19 
20 #include <asm/intrinsics.h>
21 #include <asm/processor.h>
22 
23 static __inline__ void
ia64_set_itm(unsigned long val)24 ia64_set_itm (unsigned long val)
25 {
26 	ia64_setreg(_IA64_REG_CR_ITM, val);
27 	ia64_srlz_d();
28 }
29 
30 static __inline__ unsigned long
ia64_get_itm(void)31 ia64_get_itm (void)
32 {
33 	unsigned long result;
34 
35 	result = ia64_getreg(_IA64_REG_CR_ITM);
36 	ia64_srlz_d();
37 	return result;
38 }
39 
40 static __inline__ void
ia64_set_itv(unsigned long val)41 ia64_set_itv (unsigned long val)
42 {
43 	ia64_setreg(_IA64_REG_CR_ITV, val);
44 	ia64_srlz_d();
45 }
46 
47 static __inline__ unsigned long
ia64_get_itv(void)48 ia64_get_itv (void)
49 {
50 	return ia64_getreg(_IA64_REG_CR_ITV);
51 }
52 
53 static __inline__ void
ia64_set_itc(unsigned long val)54 ia64_set_itc (unsigned long val)
55 {
56 	ia64_setreg(_IA64_REG_AR_ITC, val);
57 	ia64_srlz_d();
58 }
59 
60 static __inline__ unsigned long
ia64_get_itc(void)61 ia64_get_itc (void)
62 {
63 	unsigned long result;
64 
65 	result = ia64_getreg(_IA64_REG_AR_ITC);
66 	ia64_barrier();
67 #ifdef CONFIG_ITANIUM
68 	while (unlikely((__s32) result == -1)) {
69 		result = ia64_getreg(_IA64_REG_AR_ITC);
70 		ia64_barrier();
71 	}
72 #endif
73 	return result;
74 }
75 
76 extern void ia64_delay_loop (unsigned long loops);
77 
78 static __inline__ void
__delay(unsigned long loops)79 __delay (unsigned long loops)
80 {
81 	if (unlikely(loops < 1))
82 		return;
83 
84 	ia64_delay_loop (loops - 1);
85 }
86 
87 extern void udelay (unsigned long usecs);
88 
89 #endif /* _ASM_IA64_DELAY_H */
90