1 /* $NetBSD: timer_hb.c,v 1.21 2024/01/15 20:21:50 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: timer_hb.c,v 1.21 2024/01/15 20:21:50 thorpej Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/kernel.h> 37 #include <sys/systm.h> 38 #include <sys/device.h> 39 #include <sys/intr.h> 40 41 #include <uvm/uvm_extern.h> 42 43 #include <machine/cpu.h> 44 #include <machine/bus.h> 45 #include <machine/vectors.h> 46 47 #include <dev/clock_subr.h> 48 49 #include <news68k/news68k/isr.h> 50 #include <news68k/news68k/clockvar.h> 51 52 #include <news68k/dev/hbvar.h> 53 54 #include "ioconf.h" 55 56 /* 57 * interrupt level for clock 58 */ 59 60 #define TIMER_LEVEL 6 61 #define TIMER_SIZE 8 /* XXX */ 62 63 static int timer_hb_match(device_t, cfdata_t, void *); 64 static void timer_hb_attach(device_t, device_t, void *); 65 static void timer_hb_initclocks(int, int); 66 void clock_intr(struct clockframe); 67 68 static inline void leds_intr(void); 69 70 extern void _isr_clock(void); /* locore.s */ 71 72 CFATTACH_DECL_NEW(timer_hb, 0, 73 timer_hb_match, timer_hb_attach, NULL, NULL); 74 75 static volatile uint8_t *ctrl_timer; /* XXX */ 76 77 extern volatile u_char *ctrl_led; /* XXX */ 78 79 static int 80 timer_hb_match(device_t parent, cfdata_t cf, void *aux) 81 { 82 struct hb_attach_args *ha = aux; 83 static int timer_hb_matched; 84 85 /* Only one timer, please. */ 86 if (timer_hb_matched) 87 return 0; 88 89 if (strcmp(ha->ha_name, timer_cd.cd_name)) 90 return 0; 91 92 if (ha->ha_ipl == -1) 93 ha->ha_ipl = TIMER_LEVEL; 94 95 ha->ha_size = TIMER_SIZE; 96 97 timer_hb_matched = 1; 98 99 return 1; 100 } 101 102 static void 103 timer_hb_attach(device_t parent, device_t self, void *aux) 104 { 105 struct hb_attach_args *ha = aux; 106 107 if (ha->ha_ipl != TIMER_LEVEL) 108 panic("clock_hb_attach: wrong interrupt level"); 109 110 ctrl_timer = (uint8_t *)(ha->ha_address); /* XXX needs bus_space */ 111 112 printf("\n"); 113 114 timer_config(timer_hb_initclocks); 115 116 #if 0 /* XXX this will be done in timer_hb_initclocks() */ 117 vec_set_entry(VECI_INTRAV0 + ha->ha_ipl, _isr_clock); 118 #endif 119 } 120 121 /* 122 * Set up the interval timer (enable clock interrupts). 123 * Leave stathz 0 since there is no secondary clock available. 124 * Note that clock interrupts MUST STAY DISABLED until here. 125 */ 126 static void 127 timer_hb_initclocks(int prof, int stat) 128 { 129 int s; 130 131 s = splhigh(); 132 133 /* Install isr (in locore.s) that calls clock_intr(). */ 134 vec_set_entry(VECI_INTRAV0 + TIMER_LEVEL, _isr_clock); 135 136 /* enable the clock */ 137 *ctrl_timer = 1; 138 splx(s); 139 } 140 141 /* 142 * Clock interrupt handler. 143 * This is called by the "custom" interrupt handler. 144 * 145 * from sun3/sun3x/clock.c -tsutsui 146 */ 147 void 148 clock_intr(struct clockframe cf) 149 { 150 #ifdef LED_IDLE_CHECK 151 extern char _Idle[]; /* locore.s */ 152 #endif 153 154 /* Pulse the clock intr. enable low. */ 155 *ctrl_timer = 0; 156 *ctrl_timer = 1; 157 158 m68k_count_intr(TIMER_LEVEL); 159 160 /* Entertainment! */ 161 #ifdef LED_IDLE_CHECK 162 if (cf.cf_pc == (long)_Idle) 163 #endif 164 leds_intr(); 165 166 /* Call common clock interrupt handler. */ 167 hardclock(&cf); 168 } 169 170 /* heartbeat LED */ 171 #define LED0 0x01 172 #define LED1 0x02 173 174 static inline void 175 leds_intr(void) 176 { 177 static u_char led_countdown, led_stat; 178 u_char i; 179 180 if (led_countdown) { 181 led_countdown--; 182 return; 183 } 184 185 i = led_stat ^ LED0; 186 *ctrl_led = i; 187 led_stat = i; 188 led_countdown = hz; 189 } 190 191