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 - 2008 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#define _INTLEVEL(x) XCHAL_INT ## x ## _LEVEL
20#define INTLEVEL(x) _INTLEVEL(x)
21
22#if XCHAL_NUM_TIMERS > 0 && \
23 INTLEVEL(XCHAL_TIMER0_INTERRUPT) <= XCHAL_EXCM_LEVEL
24# define LINUX_TIMER 0
25# define LINUX_TIMER_INT XCHAL_TIMER0_INTERRUPT
26#elif XCHAL_NUM_TIMERS > 1 && \
27 INTLEVEL(XCHAL_TIMER1_INTERRUPT) <= XCHAL_EXCM_LEVEL
28# define LINUX_TIMER 1
29# define LINUX_TIMER_INT XCHAL_TIMER1_INTERRUPT
30#elif XCHAL_NUM_TIMERS > 2 && \
31 INTLEVEL(XCHAL_TIMER2_INTERRUPT) <= XCHAL_EXCM_LEVEL
32# define LINUX_TIMER 2
33# define LINUX_TIMER_INT XCHAL_TIMER2_INTERRUPT
34#else
35# error "Bad timer number for Linux configurations!"
36#endif
37
38#ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
39extern unsigned long ccount_freq;
40#define CCOUNT_PER_JIFFY (ccount_freq / HZ)
41#else
42#define CCOUNT_PER_JIFFY (CONFIG_XTENSA_CPU_CLOCK*(1000000UL/HZ))
43#endif
44
45
46typedef unsigned long long cycles_t;
47
48/*
49 * Only used for SMP.
50 */
51
52extern cycles_t cacheflush_time;
53
54#define get_cycles() (0)
55
56
57/*
58 * Register access.
59 */
60
61#define WSR_CCOUNT(r) asm volatile ("wsr %0, ccount" :: "a" (r))
62#define RSR_CCOUNT(r) asm volatile ("rsr %0, ccount" : "=a" (r))
63#define WSR_CCOMPARE(x,r) asm volatile ("wsr %0,"__stringify(SREG_CCOMPARE)"+"__stringify(x) :: "a"(r))
64#define RSR_CCOMPARE(x,r) asm volatile ("rsr %0,"__stringify(SREG_CCOMPARE)"+"__stringify(x) : "=a"(r))
65
66static inline unsigned long get_ccount (void)
67{
68 unsigned long ccount;
69 RSR_CCOUNT(ccount);
70 return ccount;
71}
72
73static inline void set_ccount (unsigned long ccount)
74{
75 WSR_CCOUNT(ccount);
76}
77
78static inline unsigned long get_linux_timer (void)
79{
80 unsigned ccompare;
81 RSR_CCOMPARE(LINUX_TIMER, ccompare);
82 return ccompare;
83}
84
85static inline void set_linux_timer (unsigned long ccompare)
86{
87 WSR_CCOMPARE(LINUX_TIMER, ccompare);
88}
89
90#endif /* __KERNEL__ */
91#endif /* _XTENSA_TIMEX_H */