timer_hb.c revision 1.6
1 /* $NetBSD: timer_hb.c,v 1.6 2003/07/15 02:59:26 lukem 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/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: timer_hb.c,v 1.6 2003/07/15 02:59:26 lukem Exp $"); 41 42 #include <sys/param.h> 43 #include <sys/kernel.h> 44 #include <sys/systm.h> 45 #include <sys/device.h> 46 47 #include <uvm/uvm_extern.h> 48 49 #include <machine/cpu.h> 50 #include <machine/bus.h> 51 52 #include <dev/clock_subr.h> 53 54 #include <news68k/news68k/isr.h> 55 #include <news68k/news68k/clockvar.h> 56 57 #include <news68k/dev/hbvar.h> 58 59 /* 60 * interrupt level for clock 61 */ 62 63 #define TIMER_LEVEL 6 64 #define TIMER_SIZE 8 /* XXX */ 65 66 int timer_hb_match(struct device *, struct cfdata *, void *); 67 void timer_hb_attach(struct device *, struct device *, void *); 68 void timer_hb_initclocks(int, int); 69 void clock_intr(struct clockframe *); 70 71 static __inline void leds_intr(void); 72 73 extern void _isr_clock(void); /* locore.s */ 74 75 CFATTACH_DECL(timer_hb, sizeof(struct device), 76 timer_hb_match, timer_hb_attach, NULL, NULL); 77 78 static volatile u_int8_t *ctrl_timer; /* XXX */ 79 80 extern volatile u_char *ctrl_led; /* XXX */ 81 extern struct cfdriver timer_cd; 82 83 int 84 timer_hb_match(parent, cf, aux) 85 struct device *parent; 86 struct cfdata *cf; 87 void *aux; 88 { 89 struct hb_attach_args *ha = aux; 90 static int timer_hb_matched; 91 92 /* Only one timer, please. */ 93 if (timer_hb_matched) 94 return (0); 95 96 if (strcmp(ha->ha_name, timer_cd.cd_name)) 97 return (0); 98 99 if (ha->ha_ipl == -1) 100 ha->ha_ipl = TIMER_LEVEL; 101 102 ha->ha_size = TIMER_SIZE; 103 104 timer_hb_matched = 1; 105 106 return 1; 107 } 108 109 void 110 timer_hb_attach(parent, self, aux) 111 struct device *parent, *self; 112 void *aux; 113 { 114 struct hb_attach_args *ha = aux; 115 116 if (ha->ha_ipl != TIMER_LEVEL) 117 panic("clock_hb_attach: wrong interrupt level"); 118 119 ctrl_timer = (u_int8_t *)IIOV(ha->ha_address); /* XXX needs bus_space */ 120 121 printf("\n"); 122 123 timer_config(timer_hb_initclocks); 124 125 #if 0 /* XXX this will be done in timer_hb_initclocks() */ 126 isrlink_custom(ha->ha_ipl, (void *)_isr_clock); 127 #endif 128 } 129 130 /* 131 * Set up the interval timer (enable clock interrupts). 132 * Leave stathz 0 since there is no secondary clock available. 133 * Note that clock interrupts MUST STAY DISABLED until here. 134 */ 135 void 136 timer_hb_initclocks(tick, statint) 137 int tick, statint; 138 { 139 int s; 140 141 s = splhigh(); 142 143 /* Install isr (in locore.s) that calls clock_intr(). */ 144 isrlink_custom(TIMER_LEVEL, (void *)_isr_clock); 145 146 /* enable the clock */ 147 *ctrl_timer = 1; 148 splx(s); 149 } 150 151 /* 152 * Clock interrupt handler. 153 * This is is called by the "custom" interrupt handler. 154 * 155 * from sun3/sun3x/clock.c -tsutsui 156 */ 157 void 158 clock_intr(cf) 159 struct clockframe *cf; 160 { 161 #ifdef LED_IDLE_CHECK 162 extern char _Idle[]; /* locore.s */ 163 #endif 164 165 /* Pulse the clock intr. enable low. */ 166 *ctrl_timer = 0; 167 *ctrl_timer = 1; 168 intrcnt[TIMER_LEVEL]++; 169 170 /* Entertainment! */ 171 #ifdef LED_IDLE_CHECK 172 if (cf.cf_pc == (long)_Idle) 173 #endif 174 leds_intr(); 175 176 /* Call common clock interrupt handler. */ 177 hardclock(cf); 178 uvmexp.intrs++; 179 } 180 181 /* heartbeat LED */ 182 #define LED0 0x01 183 #define LED1 0x02 184 185 static __inline void 186 leds_intr() 187 { 188 static u_char led_countdown, led_stat; 189 u_char i; 190 191 if (led_countdown) { 192 led_countdown--; 193 return; 194 } 195 196 i = led_stat ^ LED0; 197 *ctrl_led = i; 198 led_stat = i; 199 led_countdown = hz; 200 } 201 202
Indexes created Tue Sep 23 02:09:52 GMT 2025