timer_hb.c revision 1.7
1 /* $NetBSD: timer_hb.c,v 1.7 2004/09/04 11:28:32 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 1.7 2004/09/04 11:28:32 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 int timer_hb_match(struct device *, struct cfdata *, void *); 69 void timer_hb_attach(struct device *, struct device *, void *); 70 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 u_int8_t *ctrl_timer; /* XXX */ 81 82 extern volatile u_char *ctrl_led; /* XXX */ 83 84 int 85 timer_hb_match(parent, cf, aux) 86 struct device *parent; 87 struct cfdata *cf; 88 void *aux; 89 { 90 struct hb_attach_args *ha = aux; 91 static int timer_hb_matched; 92 93 /* Only one timer, please. */ 94 if (timer_hb_matched) 95 return (0); 96 97 if (strcmp(ha->ha_name, timer_cd.cd_name)) 98 return (0); 99 100 if (ha->ha_ipl == -1) 101 ha->ha_ipl = TIMER_LEVEL; 102 103 ha->ha_size = TIMER_SIZE; 104 105 timer_hb_matched = 1; 106 107 return 1; 108 } 109 110 void 111 timer_hb_attach(parent, self, aux) 112 struct device *parent, *self; 113 void *aux; 114 { 115 struct hb_attach_args *ha = aux; 116 117 if (ha->ha_ipl != TIMER_LEVEL) 118 panic("clock_hb_attach: wrong interrupt level"); 119 120 ctrl_timer = (u_int8_t *)IIOV(ha->ha_address); /* XXX needs bus_space */ 121 122 printf("\n"); 123 124 timer_config(timer_hb_initclocks); 125 126 #if 0 /* XXX this will be done in timer_hb_initclocks() */ 127 isrlink_custom(ha->ha_ipl, (void *)_isr_clock); 128 #endif 129 } 130 131 /* 132 * Set up the interval timer (enable clock interrupts). 133 * Leave stathz 0 since there is no secondary clock available. 134 * Note that clock interrupts MUST STAY DISABLED until here. 135 */ 136 void 137 timer_hb_initclocks(tick, statint) 138 int tick, statint; 139 { 140 int s; 141 142 s = splhigh(); 143 144 /* Install isr (in locore.s) that calls clock_intr(). */ 145 isrlink_custom(TIMER_LEVEL, (void *)_isr_clock); 146 147 /* enable the clock */ 148 *ctrl_timer = 1; 149 splx(s); 150 } 151 152 /* 153 * Clock interrupt handler. 154 * This is is called by the "custom" interrupt handler. 155 * 156 * from sun3/sun3x/clock.c -tsutsui 157 */ 158 void 159 clock_intr(cf) 160 struct clockframe *cf; 161 { 162 #ifdef LED_IDLE_CHECK 163 extern char _Idle[]; /* locore.s */ 164 #endif 165 166 /* Pulse the clock intr. enable low. */ 167 *ctrl_timer = 0; 168 *ctrl_timer = 1; 169 intrcnt[TIMER_LEVEL]++; 170 171 /* Entertainment! */ 172 #ifdef LED_IDLE_CHECK 173 if (cf.cf_pc == (long)_Idle) 174 #endif 175 leds_intr(); 176 177 /* Call common clock interrupt handler. */ 178 hardclock(cf); 179 uvmexp.intrs++; 180 } 181 182 /* heartbeat LED */ 183 #define LED0 0x01 184 #define LED1 0x02 185 186 static __inline void 187 leds_intr() 188 { 189 static u_char led_countdown, led_stat; 190 u_char i; 191 192 if (led_countdown) { 193 led_countdown--; 194 return; 195 } 196 197 i = led_stat ^ LED0; 198 *ctrl_led = i; 199 led_stat = i; 200 led_countdown = hz; 201 } 202 203
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