[PATCH] s390: Increase spinlock retry code performance
[linux/fpc-iii.git] / include / asm-xtensa / timex.h
blobd14a3755a12b96a739f88b5b99303c6b92d700f5
1 /*
2 * include/asm-xtensa/timex.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.
9 */
11 #ifndef _XTENSA_TIMEX_H
12 #define _XTENSA_TIMEX_H
14 #ifdef __KERNEL__
16 #include <asm/processor.h>
17 #include <linux/stringify.h>
19 #if XCHAL_INT_LEVEL(XCHAL_TIMER0_INTERRUPT) == 1
20 # define LINUX_TIMER 0
21 #elif XCHAL_INT_LEVEL(XCHAL_TIMER1_INTERRUPT) == 1
22 # define LINUX_TIMER 1
23 #elif XCHAL_INT_LEVEL(XCHAL_TIMER2_INTERRUPT) == 1
24 # define LINUX_TIMER 2
25 #else
26 # error "Bad timer number for Linux configurations!"
27 #endif
29 #define LINUX_TIMER_INT XCHAL_TIMER_INTERRUPT(LINUX_TIMER)
30 #define LINUX_TIMER_MASK (1L << LINUX_TIMER_INT)
32 #define CLOCK_TICK_RATE 1193180 /* (everyone is using this value) */
33 #define CLOCK_TICK_FACTOR 20 /* Factor of both 10^6 and CLOCK_TICK_RATE */
34 #define FINETUNE ((((((long)LATCH * HZ - CLOCK_TICK_RATE) << SHIFT_HZ) * \
35 (1000000/CLOCK_TICK_FACTOR) / (CLOCK_TICK_RATE/CLOCK_TICK_FACTOR)) \
36 << (SHIFT_SCALE-SHIFT_HZ)) / HZ)
38 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
39 extern unsigned long ccount_per_jiffy;
40 extern unsigned long ccount_nsec;
41 #define CCOUNT_PER_JIFFY ccount_per_jiffy
42 #define CCOUNT_NSEC ccount_nsec
43 #else
44 #define CCOUNT_PER_JIFFY (CONFIG_XTENSA_CPU_CLOCK*(1000000UL/HZ))
45 #define CCOUNT_NSEC (1000000000UL / CONFIG_XTENSA_CPU_CLOCK)
46 #endif
49 typedef unsigned long long cycles_t;
52 * Only used for SMP.
55 extern cycles_t cacheflush_time;
57 #define get_cycles() (0)
61 * Register access.
64 #define WSR_CCOUNT(r) __asm__("wsr %0,"__stringify(CCOUNT) :: "a" (r))
65 #define RSR_CCOUNT(r) __asm__("rsr %0,"__stringify(CCOUNT) : "=a" (r))
66 #define WSR_CCOMPARE(x,r) __asm__("wsr %0,"__stringify(CCOMPARE_0)"+"__stringify(x) :: "a"(r))
67 #define RSR_CCOMPARE(x,r) __asm__("rsr %0,"__stringify(CCOMPARE_0)"+"__stringify(x) : "=a"(r))
69 static inline unsigned long get_ccount (void)
71 unsigned long ccount;
72 RSR_CCOUNT(ccount);
73 return ccount;
76 static inline void set_ccount (unsigned long ccount)
78 WSR_CCOUNT(ccount);
81 static inline unsigned long get_linux_timer (void)
83 unsigned ccompare;
84 RSR_CCOMPARE(LINUX_TIMER, ccompare);
85 return ccompare;
88 static inline void set_linux_timer (unsigned long ccompare)
90 WSR_CCOMPARE(LINUX_TIMER, ccompare);
93 #endif /* __KERNEL__ */
94 #endif /* _XTENSA_TIMEX_H */