1 /* $NetBSD: timer_hb.c,v 1.18 2010/12/20 00:25:40 matt 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 1.18 2010/12/20 00:25:40 matt 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 46 #include <dev/clock_subr.h> 47 48 #include <news68k/news68k/isr.h> 49 #include <news68k/news68k/clockvar.h> 50 51 #include <news68k/dev/hbvar.h> 52 53 #include "ioconf.h" 54 55 /* 56 * interrupt level for clock 57 */ 58 59 #define TIMER_LEVEL 6 60 #define TIMER_SIZE 8 /* XXX */ 61 62 static int timer_hb_match(device_t, cfdata_t, void *); 63 static void timer_hb_attach(device_t, device_t, void *); 64 static void timer_hb_initclocks(int, int); 65 void clock_intr(struct clockframe *); 66 67 static inline void leds_intr(void); 68 69 extern void _isr_clock(void); /* locore.s */ 70 71 CFATTACH_DECL_NEW(timer_hb, 0, 72 timer_hb_match, timer_hb_attach, NULL, NULL); 73 74 static volatile uint8_t *ctrl_timer; /* XXX */ 75 76 extern volatile u_char *ctrl_led; /* XXX */ 77 78 static int 79 timer_hb_match(device_t parent, cfdata_t cf, void *aux) 80 { 81 struct hb_attach_args *ha = aux; 82 static int timer_hb_matched; 83 84 /* Only one timer, please. */ 85 if (timer_hb_matched) 86 return 0; 87 88 if (strcmp(ha->ha_name, timer_cd.cd_name)) 89 return 0; 90 91 if (ha->ha_ipl == -1) 92 ha->ha_ipl = TIMER_LEVEL; 93 94 ha->ha_size = TIMER_SIZE; 95 96 timer_hb_matched = 1; 97 98 return 1; 99 } 100 101 static void 102 timer_hb_attach(device_t parent, device_t self, void *aux) 103 { 104 struct hb_attach_args *ha = aux; 105 106 if (ha->ha_ipl != TIMER_LEVEL) 107 panic("clock_hb_attach: wrong interrupt level"); 108 109 ctrl_timer = (uint8_t *)IIOV(ha->ha_address); /* XXX needs bus_space */ 110 111 printf("\n"); 112 113 timer_config(timer_hb_initclocks); 114 115 #if 0 /* XXX this will be done in timer_hb_initclocks() */ 116 isrlink_custom(ha->ha_ipl, (void *)_isr_clock); 117 #endif 118 } 119 120 /* 121 * Set up the interval timer (enable clock interrupts). 122 * Leave stathz 0 since there is no secondary clock available. 123 * Note that clock interrupts MUST STAY DISABLED until here. 124 */ 125 static void 126 timer_hb_initclocks(int prof, int stat) 127 { 128 int s; 129 130 s = splhigh(); 131 132 /* Install isr (in locore.s) that calls clock_intr(). */ 133 isrlink_custom(TIMER_LEVEL, (void *)_isr_clock); 134 135 /* enable the clock */ 136 *ctrl_timer = 1; 137 splx(s); 138 } 139 140 /* 141 * Clock interrupt handler. 142 * This is called by the "custom" interrupt handler. 143 * 144 * from sun3/sun3x/clock.c -tsutsui 145 */ 146 void 147 clock_intr(struct clockframe *cf) 148 { 149 #ifdef LED_IDLE_CHECK 150 extern char _Idle[]; /* locore.s */ 151 #endif 152 153 /* Pulse the clock intr. enable low. */ 154 *ctrl_timer = 0; 155 *ctrl_timer = 1; 156 intrcnt[TIMER_LEVEL]++; 157 158 /* Entertainment! */ 159 #ifdef LED_IDLE_CHECK 160 if (cf.cf_pc == (long)_Idle) 161 #endif 162 leds_intr(); 163 164 /* Call common clock interrupt handler. */ 165 hardclock(cf); 166 curcpu()->ci_data.cpu_nintr++; 167 } 168 169 /* heartbeat LED */ 170 #define LED0 0x01 171 #define LED1 0x02 172 173 static inline void 174 leds_intr(void) 175 { 176 static u_char led_countdown, led_stat; 177 u_char i; 178 179 if (led_countdown) { 180 led_countdown--; 181 return; 182 } 183 184 i = led_stat ^ LED0; 185 *ctrl_led = i; 186 led_stat = i; 187 led_countdown = hz; 188 } 189 190