tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
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
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
28
29#define LINUX_TIMER_INT XCHAL_TIMER_INTERRUPT(LINUX_TIMER)
30#define LINUX_TIMER_MASK (1L << LINUX_TIMER_INT)
31
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)
37
38#ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
39extern unsigned long ccount_per_jiffy;
40extern 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
47
48
49typedef unsigned long long cycles_t;
50
51/*
52 * Only used for SMP.
53 */
54
55extern cycles_t cacheflush_time;
56
57#define get_cycles() (0)
58
59
60/*
61 * Register access.
62 */
63
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))
68
69static inline unsigned long get_ccount (void)
70{
71 unsigned long ccount;
72 RSR_CCOUNT(ccount);
73 return ccount;
74}
75
76static inline void set_ccount (unsigned long ccount)
77{
78 WSR_CCOUNT(ccount);
79}
80
81static inline unsigned long get_linux_timer (void)
82{
83 unsigned ccompare;
84 RSR_CCOMPARE(LINUX_TIMER, ccompare);
85 return ccompare;
86}
87
88static inline void set_linux_timer (unsigned long ccompare)
89{
90 WSR_CCOMPARE(LINUX_TIMER, ccompare);
91}
92
93#endif /* __KERNEL__ */
94#endif /* _XTENSA_TIMEX_H */