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 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 */ 43 extern int (*mips_timer_state)(void); 44 extern 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 */ 50 extern unsigned int (*mips_hpt_read)(void); 51 extern 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 */ 58 extern 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 */ 65 extern unsigned long (*do_gettimeoffset)(void); 66 67 /* 68 * high-level timer interrupt routines. 69 */ 70 extern void timer_interrupt(int irq, void *dev_id, struct pt_regs *regs); 71 72 /* 73 * the corresponding low-level timer interrupt routine. 74 */ 75 extern 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 */ 80 extern void local_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs); 81 extern 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 * board_timer_setup must be setup properly in machine setup routine. 87 */ 88 struct irqaction; 89 extern void (*board_time_init)(void); 90 extern void (*board_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 */ 97 extern unsigned int mips_hpt_frequency; 98 99 #endif /* _ASM_TIME_H */ 100