timer_hb.c revision 1.10
1 /* $NetBSD: timer_hb.c,v 1.10 2005/06/02 15:24:04 tsutsui 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 1.10 2005/06/02 15:24:04 tsutsui 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 #include "ioconf.h" 60 61 /* 62 * interrupt level for clock 63 */ 64 65 #define TIMER_LEVEL 6 66 #define TIMER_SIZE 8 /* XXX */ 67 68 static int timer_hb_match(struct device *, struct cfdata *, void *); 69 static void timer_hb_attach(struct device *, struct device *, void *); 70 static void timer_hb_initclocks(int, int); 71 void clock_intr(struct clockframe *); 72 73 static __inline void leds_intr(void); 74 75 extern void _isr_clock(void); /* locore.s */ 76 77 CFATTACH_DECL(timer_hb, sizeof(struct device), 78 timer_hb_match, timer_hb_attach, NULL, NULL); 79 80 static volatile uint8_t *ctrl_timer; /* XXX */ 81 82 extern volatile u_char *ctrl_led; /* XXX */ 83 84 static int 85 timer_hb_match(struct device *parent, struct cfdata *cf, void *aux) 86 { 87 struct hb_attach_args *ha = aux; 88 static int timer_hb_matched; 89 90 /* Only one timer, please. */ 91 if (timer_hb_matched) 92 return 0; 93 94 if (strcmp(ha->ha_name, timer_cd.cd_name)) 95 return 0; 96 97 if (ha->ha_ipl == -1) 98 ha->ha_ipl = TIMER_LEVEL; 99 100 ha->ha_size = TIMER_SIZE; 101 102 timer_hb_matched = 1; 103 104 return 1; 105 } 106 107 static void 108 timer_hb_attach(struct device *parent, struct device *self, void *aux) 109 { 110 struct hb_attach_args *ha = aux; 111 112 if (ha->ha_ipl != TIMER_LEVEL) 113 panic("clock_hb_attach: wrong interrupt level"); 114 115 ctrl_timer = (uint8_t *)IIOV(ha->ha_address); /* XXX needs bus_space */ 116 117 printf("\n"); 118 119 timer_config(timer_hb_initclocks); 120 121 #if 0 /* XXX this will be done in timer_hb_initclocks() */ 122 isrlink_custom(ha->ha_ipl, (void *)_isr_clock); 123 #endif 124 } 125 126 /* 127 * Set up the interval timer (enable clock interrupts). 128 * Leave stathz 0 since there is no secondary clock available. 129 * Note that clock interrupts MUST STAY DISABLED until here. 130 */ 131 static void 132 timer_hb_initclocks(int prof, int stat) 133 { 134 int s; 135 136 s = splhigh(); 137 138 /* Install isr (in locore.s) that calls clock_intr(). */ 139 isrlink_custom(TIMER_LEVEL, (void *)_isr_clock); 140 141 /* enable the clock */ 142 *ctrl_timer = 1; 143 splx(s); 144 } 145 146 /* 147 * Clock interrupt handler. 148 * This is is called by the "custom" interrupt handler. 149 * 150 * from sun3/sun3x/clock.c -tsutsui 151 */ 152 void 153 clock_intr(struct clockframe *cf) 154 { 155 #ifdef LED_IDLE_CHECK 156 extern char _Idle[]; /* locore.s */ 157 #endif 158 159 /* Pulse the clock intr. enable low. */ 160 *ctrl_timer = 0; 161 *ctrl_timer = 1; 162 intrcnt[TIMER_LEVEL]++; 163 164 /* Entertainment! */ 165 #ifdef LED_IDLE_CHECK 166 if (cf.cf_pc == (long)_Idle) 167 #endif 168 leds_intr(); 169 170 /* Call common clock interrupt handler. */ 171 hardclock(cf); 172 uvmexp.intrs++; 173 } 174 175 /* heartbeat LED */ 176 #define LED0 0x01 177 #define LED1 0x02 178 179 static __inline void 180 leds_intr(void) 181 { 182 static u_char led_countdown, led_stat; 183 u_char i; 184 185 if (led_countdown) { 186 led_countdown--; 187 return; 188 } 189 190 i = led_stat ^ LED0; 191 *ctrl_led = i; 192 led_stat = i; 193 led_countdown = hz; 194 } 195 196
Indexes created Tue Sep 23 23:09:58 GMT 2025