timer_hb.c revision 1.3
1 /* $NetBSD: timer_hb.c,v 1.3 2002/10/02 04:40:08 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1996 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 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/param.h> 40 #include <sys/kernel.h> 41 #include <sys/systm.h> 42 #include <sys/device.h> 43 44 #include <uvm/uvm_extern.h> 45 46 #include <machine/cpu.h> 47 #include <machine/bus.h> 48 49 #include <dev/clock_subr.h> 50 51 #include <news68k/news68k/isr.h> 52 #include <news68k/news68k/clockvar.h> 53 54 #include <news68k/dev/hbvar.h> 55 56 /* 57 * interrupt level for clock 58 */ 59 60 #define TIMER_LEVEL 6 61 #define TIMER_SIZE 8 /* XXX */ 62 63 int timer_hb_match(struct device *, struct cfdata *, void *); 64 void timer_hb_attach(struct device *, struct device *, void *); 65 void timer_hb_initclocks(int, int); 66 void clock_intr(struct clockframe *); 67 68 static __inline void leds_intr __P((void)); 69 70 extern void _isr_clock __P((void)); /* locore.s */ 71 72 CFATTACH_DECL(timer_hb, sizeof(struct device), 73 timer_hb_match, timer_hb_attach, NULL, NULL); 74 75 static volatile u_int8_t *ctrl_timer; /* XXX */ 76 77 extern volatile u_char *ctrl_led; /* XXX */ 78 extern struct cfdriver timer_cd; 79 80 int 81 timer_hb_match(parent, cf, aux) 82 struct device *parent; 83 struct cfdata *cf; 84 void *aux; 85 { 86 struct hb_attach_args *ha = aux; 87 static int timer_hb_matched; 88 89 /* Only one timer, please. */ 90 if (timer_hb_matched) 91 return (0); 92 93 if (strcmp(ha->ha_name, timer_cd.cd_name)) 94 return (0); 95 96 if (ha->ha_ipl == -1) 97 ha->ha_ipl = TIMER_LEVEL; 98 99 ha->ha_size = TIMER_SIZE; 100 101 timer_hb_matched = 1; 102 103 return 1; 104 } 105 106 void 107 timer_hb_attach(parent, self, aux) 108 struct device *parent, *self; 109 void *aux; 110 { 111 struct hb_attach_args *ha = aux; 112 113 if (ha->ha_ipl != TIMER_LEVEL) 114 panic("clock_hb_attach: wrong interrupt level"); 115 116 ctrl_timer = (u_int8_t *)IIOV(ha->ha_address); /* XXX needs bus_space */ 117 118 printf("\n"); 119 120 timer_config(timer_hb_initclocks); 121 122 #if 0 /* XXX this will be done in timer_hb_initclocks() */ 123 isrlink_custom(ha->ha_ipl, (void *)_isr_clock); 124 #endif 125 } 126 127 /* 128 * Set up the interval timer (enable clock interrupts). 129 * Leave stathz 0 since there is no secondary clock available. 130 * Note that clock interrupts MUST STAY DISABLED until here. 131 */ 132 void 133 timer_hb_initclocks(tick, statint) 134 int tick, statint; 135 { 136 int s; 137 138 s = splhigh(); 139 140 /* Install isr (in locore.s) that calls clock_intr(). */ 141 isrlink_custom(TIMER_LEVEL, (void *)_isr_clock); 142 143 /* enable the clock */ 144 *ctrl_timer = 1; 145 splx(s); 146 } 147 148 /* 149 * Clock interrupt handler. 150 * This is is called by the "custom" interrupt handler. 151 * 152 * from sun3/sun3x/clock.c -tsutsui 153 */ 154 void 155 clock_intr(cf) 156 struct clockframe *cf; 157 { 158 #ifdef LED_IDLE_CHECK 159 extern char _Idle[]; /* locore.s */ 160 #endif 161 162 /* Pulse the clock intr. enable low. */ 163 *ctrl_timer = 0; 164 *ctrl_timer = 1; 165 intrcnt[TIMER_LEVEL]++; 166 167 /* Entertainment! */ 168 #ifdef LED_IDLE_CHECK 169 if (cf.cf_pc == (long)_Idle) 170 #endif 171 leds_intr(); 172 173 /* Call common clock interrupt handler. */ 174 hardclock(cf); 175 uvmexp.intrs++; 176 } 177 178 /* heartbeat LED */ 179 #define LED0 0x01 180 #define LED1 0x02 181 182 static __inline void 183 leds_intr() 184 { 185 static u_char led_countdown, led_stat; 186 u_char i; 187 188 if (led_countdown) { 189 led_countdown--; 190 return; 191 } 192 193 i = led_stat ^ LED0; 194 *ctrl_led = i; 195 led_stat = i; 196 led_countdown = hz; 197 } 198 199
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