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Chris Zankel9a8fd552005-06-23 22:01:26 -07001/*
2 * include/asm-xtensa/timex.h
3 *
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.
7 *
8 * Copyright (C) 2001 - 2005 Tensilica Inc.
9 */
10
11#ifndef _XTENSA_TIMEX_H
12#define _XTENSA_TIMEX_H
13
14#ifdef __KERNEL__
15
16#include <asm/processor.h>
17#include <linux/stringify.h>
18
Chris Zankel173d66812006-12-10 02:18:48 -080019#define _INTLEVEL(x) XCHAL_INT ## x ## _LEVEL
20#define INTLEVEL(x) _INTLEVEL(x)
21
22#if INTLEVEL(XCHAL_TIMER0_INTERRUPT) == 1
Chris Zankel9a8fd552005-06-23 22:01:26 -070023# define LINUX_TIMER 0
Chris Zankel173d66812006-12-10 02:18:48 -080024# define LINUX_TIMER_INT XCHAL_TIMER0_INTERRUPT
25#elif INTLEVEL(XCHAL_TIMER1_INTERRUPT) == 1
Chris Zankel9a8fd552005-06-23 22:01:26 -070026# define LINUX_TIMER 1
Chris Zankel173d66812006-12-10 02:18:48 -080027# define LINUX_TIMER_INT XCHAL_TIMER1_INTERRUPT
28#elif INTLEVEL(XCHAL_TIMER2_INTERRUPT) == 1
Chris Zankel9a8fd552005-06-23 22:01:26 -070029# define LINUX_TIMER 2
Chris Zankel173d66812006-12-10 02:18:48 -080030# define LINUX_TIMER_INT XCHAL_TIMER2_INTERRUPT
Chris Zankel9a8fd552005-06-23 22:01:26 -070031#else
32# error "Bad timer number for Linux configurations!"
33#endif
34
Chris Zankel9a8fd552005-06-23 22:01:26 -070035#define LINUX_TIMER_MASK (1L << LINUX_TIMER_INT)
36
37#define CLOCK_TICK_RATE 1193180 /* (everyone is using this value) */
38#define CLOCK_TICK_FACTOR 20 /* Factor of both 10^6 and CLOCK_TICK_RATE */
Chris Zankel9a8fd552005-06-23 22:01:26 -070039
40#ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
41extern unsigned long ccount_per_jiffy;
42extern unsigned long ccount_nsec;
43#define CCOUNT_PER_JIFFY ccount_per_jiffy
Chris Zankel2b8aea72007-08-05 10:26:30 -070044#define NSEC_PER_CCOUNT ccount_nsec
Chris Zankel9a8fd552005-06-23 22:01:26 -070045#else
46#define CCOUNT_PER_JIFFY (CONFIG_XTENSA_CPU_CLOCK*(1000000UL/HZ))
Chris Zankel2b8aea72007-08-05 10:26:30 -070047#define NSEC_PER_CCOUNT (1000UL / CONFIG_XTENSA_CPU_CLOCK)
Chris Zankel9a8fd552005-06-23 22:01:26 -070048#endif
49
50
51typedef unsigned long long cycles_t;
52
53/*
54 * Only used for SMP.
55 */
56
57extern cycles_t cacheflush_time;
58
59#define get_cycles() (0)
60
61
62/*
63 * Register access.
64 */
65
Chris Zankelde6b0342007-12-19 10:21:50 -080066#define WSR_CCOUNT(r) asm volatile ("wsr %0,"__stringify(CCOUNT) :: "a" (r))
67#define RSR_CCOUNT(r) asm volatile ("rsr %0,"__stringify(CCOUNT) : "=a" (r))
68#define WSR_CCOMPARE(x,r) asm volatile ("wsr %0,"__stringify(CCOMPARE)"+"__stringify(x) :: "a"(r))
69#define RSR_CCOMPARE(x,r) asm volatile ("rsr %0,"__stringify(CCOMPARE)"+"__stringify(x) : "=a"(r))
Chris Zankel9a8fd552005-06-23 22:01:26 -070070
71static inline unsigned long get_ccount (void)
72{
73 unsigned long ccount;
74 RSR_CCOUNT(ccount);
75 return ccount;
76}
77
78static inline void set_ccount (unsigned long ccount)
79{
80 WSR_CCOUNT(ccount);
81}
82
83static inline unsigned long get_linux_timer (void)
84{
85 unsigned ccompare;
86 RSR_CCOMPARE(LINUX_TIMER, ccompare);
87 return ccompare;
88}
89
90static inline void set_linux_timer (unsigned long ccompare)
91{
92 WSR_CCOMPARE(LINUX_TIMER, ccompare);
93}
94
95#endif /* __KERNEL__ */
96#endif /* _XTENSA_TIMEX_H */