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 */
15
16 /*
17 * Please refer to Documentation/mips/time.README.
18 */
19
20 #ifndef _ASM_TIME_H
21 #define _ASM_TIME_H
22
23 #include <linux/ptrace.h> /* for struct pt_regs */
24 #include <linux/linkage.h> /* for asmlinkage */
25 #include <linux/rtc.h> /* for struct rtc_time */
26
27 /*
28 * RTC ops. By default, they point to no-RTC functions.
29 * rtc_get_time - mktime(year, mon, day, hour, min, sec) in seconds.
30 * rtc_set_time - reverse the above translation and set time to RTC.
31 * rtc_set_mmss - similar to rtc_set_time, but only min and sec need
32 * to be set. Used by RTC sync-up.
33 */
34 extern unsigned long (*rtc_get_time)(void);
35 extern int (*rtc_set_time)(unsigned long);
36 extern int (*rtc_set_mmss)(unsigned long);
37
38 /*
39 * Timer interrupt ack function.
40 * May be NULL if the interrupt is self-recoverable.
41 */
42 extern void (*mips_timer_ack)(void);
43
44 /*
45 * High precision timer functions.
46 * If mips_hpt_read is NULL, an R4k-compatible timer setup is attempted.
47 */
48 extern unsigned int (*mips_hpt_read)(void);
49 extern void (*mips_hpt_init)(unsigned int);
50
51 /*
52 * to_tm() converts system time back to (year, mon, day, hour, min, sec).
53 * It is intended to help implement rtc_set_time() functions.
54 * Copied from PPC implementation.
55 */
56 extern void to_tm(unsigned long tim, struct rtc_time *tm);
57
58 /*
59 * do_gettimeoffset(). By default, this func pointer points to
60 * do_null_gettimeoffset(), which leads to the same resolution as HZ.
61 * Higher resolution versions are available, which give ~1us resolution.
62 */
63 extern unsigned long (*do_gettimeoffset)(void);
64
65 /*
66 * high-level timer interrupt routines.
67 */
68 extern void timer_interrupt(int irq, void *dev_id, struct pt_regs *regs);
69
70 /*
71 * the corresponding low-level timer interrupt routine.
72 */
73 extern asmlinkage void ll_timer_interrupt(int irq, struct pt_regs *regs);
74
75 /*
76 * profiling and process accouting is done separately in local_timer_interrupt
77 */
78 extern void local_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs);
79 extern asmlinkage void ll_local_timer_interrupt(int irq, struct pt_regs *regs);
80
81 /*
82 * board specific routines required by time_init().
83 * board_time_init is defaulted to NULL and can remain so.
84 * board_timer_setup must be setup properly in machine setup routine.
85 */
86 struct irqaction;
87 extern void (*board_time_init)(void);
88 extern void (*board_timer_setup)(struct irqaction *irq);
89
90 /*
91 * mips_counter_frequency - must be set if you intend to use
92 * counter as timer interrupt source or use fixed_rate_gettimeoffset.
93 */
94 extern unsigned int mips_counter_frequency;
95
96 #endif /* _ASM_TIME_H */
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