timer_hb.c revision 1.13
1 /* $NetBSD: timer_hb.c,v 1.13 2008/01/28 17:07:19 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 1.13 2008/01/28 17:07:19 tsutsui Exp $"); 41 42 #include <sys/param.h> 43 #include <sys/kernel.h> 44 #include <sys/systm.h> 45 #include <sys/device.h> 46 #include <sys/intr.h> 47 48 #include <uvm/uvm_extern.h> 49 50 #include <machine/cpu.h> 51 #include <machine/bus.h> 52 53 #include <dev/clock_subr.h> 54 55 #include <news68k/news68k/isr.h> 56 #include <news68k/news68k/clockvar.h> 57 58 #include <news68k/dev/hbvar.h> 59 60 #include "ioconf.h" 61 62 /* 63 * interrupt level for clock 64 */ 65 66 #define TIMER_LEVEL 6 67 #define TIMER_SIZE 8 /* XXX */ 68 69 static int timer_hb_match(struct device *, struct cfdata *, void *); 70 static void timer_hb_attach(struct device *, struct device *, void *); 71 static void timer_hb_initclocks(int, int); 72 void clock_intr(struct clockframe *); 73 74 static inline void leds_intr(void); 75 76 extern void _isr_clock(void); /* locore.s */ 77 78 CFATTACH_DECL(timer_hb, sizeof(struct device), 79 timer_hb_match, timer_hb_attach, NULL, NULL); 80 81 static volatile uint8_t *ctrl_timer; /* XXX */ 82 83 extern volatile u_char *ctrl_led; /* XXX */ 84 85 static int 86 timer_hb_match(struct device *parent, struct cfdata *cf, void *aux) 87 { 88 struct hb_attach_args *ha = aux; 89 static int timer_hb_matched; 90 91 /* Only one timer, please. */ 92 if (timer_hb_matched) 93 return 0; 94 95 if (strcmp(ha->ha_name, timer_cd.cd_name)) 96 return 0; 97 98 if (ha->ha_ipl == -1) 99 ha->ha_ipl = TIMER_LEVEL; 100 101 ha->ha_size = TIMER_SIZE; 102 103 timer_hb_matched = 1; 104 105 return 1; 106 } 107 108 static void 109 timer_hb_attach(struct device *parent, struct device *self, 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 = (uint8_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 static void 133 timer_hb_initclocks(int prof, int stat) 134 { 135 int s; 136 137 s = splhigh(); 138 139 /* Install isr (in locore.s) that calls clock_intr(). */ 140 isrlink_custom(TIMER_LEVEL, (void *)_isr_clock); 141 142 /* enable the clock */ 143 *ctrl_timer = 1; 144 splx(s); 145 } 146 147 /* 148 * Clock interrupt handler. 149 * This is is called by the "custom" interrupt handler. 150 * 151 * from sun3/sun3x/clock.c -tsutsui 152 */ 153 void 154 clock_intr(struct clockframe *cf) 155 { 156 #ifdef LED_IDLE_CHECK 157 extern char _Idle[]; /* locore.s */ 158 #endif 159 160 idepth++; 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 idepth--; 178 } 179 180 /* heartbeat LED */ 181 #define LED0 0x01 182 #define LED1 0x02 183 184 static inline void 185 leds_intr(void) 186 { 187 static u_char led_countdown, led_stat; 188 u_char i; 189 190 if (led_countdown) { 191 led_countdown--; 192 return; 193 } 194 195 i = led_stat ^ LED0; 196 *ctrl_led = i; 197 led_stat = i; 198 led_countdown = hz; 199 } 200 201
Indexes created Wed Sep 24 05:09:52 GMT 2025