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1/*
2 * Copyright (C) 2001, 2002, MontaVista Software Inc.
3 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
4 * Copyright (c) 2003 Maciej W. Rozycki
5 *
6 * include/asm-mips/time.h
7 * header file for the new style time.c file and time services.
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 * Please refer to Documentation/mips/time.README.
15 */
16#ifndef _ASM_TIME_H
17#define _ASM_TIME_H
18
19#include <linux/interrupt.h>
20#include <linux/linkage.h>
21#include <linux/ptrace.h>
22#include <linux/rtc.h>
23#include <linux/spinlock.h>
24
25extern spinlock_t rtc_lock;
26
27/*
28 * RTC ops. By default, they point to no-RTC functions.
29 * rtc_mips_get_time - mktime(year, mon, day, hour, min, sec) in seconds.
30 * rtc_mips_set_time - reverse the above translation and set time to RTC.
31 * rtc_mips_set_mmss - similar to rtc_set_time, but only min and sec need
32 * to be set. Used by RTC sync-up.
33 */
34extern unsigned long (*rtc_mips_get_time)(void);
35extern int (*rtc_mips_set_time)(unsigned long);
36extern int (*rtc_mips_set_mmss)(unsigned long);
37
38/*
39 * Timer interrupt functions.
40 * mips_timer_state is needed for high precision timer calibration.
41 * mips_timer_ack may be NULL if the interrupt is self-recoverable.
42 */
43extern int (*mips_timer_state)(void);
44extern void (*mips_timer_ack)(void);
45
46/*
47 * High precision timer functions.
48 * If mips_hpt_read is NULL, an R4k-compatible timer setup is attempted.
49 */
50extern unsigned int (*mips_hpt_read)(void);
51extern void (*mips_hpt_init)(unsigned int);
52
53/*
54 * to_tm() converts system time back to (year, mon, day, hour, min, sec).
55 * It is intended to help implement rtc_set_time() functions.
56 * Copied from PPC implementation.
57 */
58extern void to_tm(unsigned long tim, struct rtc_time *tm);
59
60/*
61 * do_gettimeoffset(). By default, this func pointer points to
62 * do_null_gettimeoffset(), which leads to the same resolution as HZ.
63 * Higher resolution versions are available, which give ~1us resolution.
64 */
65extern unsigned long (*do_gettimeoffset)(void);
66
67/*
68 * high-level timer interrupt routines.
69 */
70extern irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs);
71
72/*
73 * the corresponding low-level timer interrupt routine.
74 */
75extern asmlinkage void ll_timer_interrupt(int irq, struct pt_regs *regs);
76
77/*
78 * profiling and process accouting is done separately in local_timer_interrupt
79 */
80extern void local_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs);
81extern asmlinkage void ll_local_timer_interrupt(int irq, struct pt_regs *regs);
82
83/*
84 * board specific routines required by time_init().
85 * board_time_init is defaulted to NULL and can remain so.
86 * plat_timer_setup must be setup properly in machine setup routine.
87 */
88struct irqaction;
89extern void (*board_time_init)(void);
90extern void plat_timer_setup(struct irqaction *irq);
91
92/*
93 * mips_hpt_frequency - must be set if you intend to use an R4k-compatible
94 * counter as a timer interrupt source; otherwise it can be set up
95 * automagically with an aid of mips_timer_state.
96 */
97extern unsigned int mips_hpt_frequency;
98
99#endif /* _ASM_TIME_H */