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timer.c revision 1.4 
      1 /*	$NetBSD: timer.c,v 1.4 2007/12/03 15:34:07 ad Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by UCHIYAMA Yasushi.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 __KERNEL_RCSID(0, "$NetBSD: timer.c,v 1.4 2007/12/03 15:34:07 ad Exp $");
     41 
     42 #include "debug_playstation2.h"
     43 
     44 #include <sys/param.h>
     45 #include <sys/systm.h>
     46 
     47 #include <playstation2/playstation2/interrupt.h>
     48 
     49 #include <playstation2/ee/eevar.h>
     50 #include <playstation2/ee/intcvar.h>
     51 #include <playstation2/ee/timervar.h>
     52 #include <playstation2/ee/timerreg.h>
     53 
     54 
     55 #ifdef DEBUG
     56 #define STATIC
     57 #else
     58 #define STATIC static
     59 #endif
     60 
     61 STATIC int timer0_intr(void *);
     62 
     63 /*
     64  * EE timer usage
     65  *	0 ... 100 Hz clock interrupt.
     66  *      1 ... one shot interrupt for software interrupt for IPL_SOFT
     67  *	2 ... for IPL_SOFTCLOCK
     68  *	3 ... for IPL_SOFTNET, IPL_SOFTSERIAL
     69  */
     70 
     71 void
     72 timer_init()
     73 {
     74 
     75 	_reg_write_4(T0_MODE_REG, (T_MODE_EQUF | T_MODE_OVFF));
     76 	_reg_write_4(T1_MODE_REG, (T_MODE_EQUF | T_MODE_OVFF));
     77 	_reg_write_4(T2_MODE_REG, (T_MODE_EQUF | T_MODE_OVFF));
     78 	_reg_write_4(T3_MODE_REG, (T_MODE_EQUF | T_MODE_OVFF));
     79 }
     80 
     81 void
     82 timer_clock_init()
     83 {
     84 	/* clock interrupt (296.912MHz / 2 / 256) * 5760 = 100Hz */
     85 	intc_intr_establish(I_CH9_TIMER0, IPL_CLOCK, timer0_intr, 0);
     86 	_reg_write_4(T0_COUNT_REG, 0);
     87 	_reg_write_4(T0_COMP_REG, 5760);
     88 	_reg_write_4(T0_MODE_REG, T_MODE_CLKS_BUSCLK256 | T_MODE_ZRET |
     89 	    T_MODE_CUE | T_MODE_CMPE);
     90 }
     91 
     92 void
     93 timer_one_shot(int timer)
     94 {
     95 	KDASSERT(LEGAL_TIMER(timer) && timer != 0);
     96 
     97 	_reg_write_4(T_COUNT_REG(timer), 0);
     98 	_reg_write_4(T_COMP_REG(timer), 1);
     99 	_reg_write_4(T_MODE_REG(timer), T_MODE_CUE | T_MODE_CMPE);
    100 }
    101 
    102 /*
    103  * interrupt handler for clock interrupt (100Hz)
    104  */
    105 int
    106 timer0_intr(void *arg)
    107 {
    108 
    109 	_reg_write_4(T0_MODE_REG, _reg_read_4(T0_MODE_REG) | T_MODE_EQUF);
    110 
    111 	_playstation2_evcnt.clock.ev_count++;
    112 
    113 	hardclock(&playstation2_clockframe);
    114 
    115 	return (1);
    116 }
    117 
    118 /* one shot timer interrupt for software interrupt */
    119 int
    120 timer1_intr(void *arg)
    121 {
    122 
    123 	_reg_write_4(T1_MODE_REG, T_MODE_EQUF | T_MODE_OVFF);
    124 
    125 #ifdef __HAVE_FAST_SOFTINTS
    126 	softintr_dispatch(0); /* IPL_SOFT */
    127 #endif
    128 
    129 	return (1);
    130 }
    131 
    132 int
    133 timer2_intr(void *arg)
    134 {
    135 
    136 	_reg_write_4(T2_MODE_REG, T_MODE_EQUF | T_MODE_OVFF);
    137 
    138 #ifdef __HAVE_FAST_SOFTINTS
    139 	softintr_dispatch(1); /* IPL_SOFTCLOCK */
    140 #endif
    141 	return (1);
    142 }
    143 
    144 int
    145 timer3_intr(void *arg)
    146 {
    147 
    148 	_reg_write_4(T3_MODE_REG, T_MODE_EQUF | T_MODE_OVFF);
    149 
    150 #ifdef __HAVE_FAST_SOFTINTS
    151 	softintr_dispatch(3); /* IPL_SOFTSERIAL */
    152 	softintr_dispatch(2); /* IPL_SOFTNET */
    153 #endif
    154 
    155 	return (1);
    156 }
    157