sys/arch/news68k/dev/timer_hb.c

   1 /*      $NetBSD: timer_hb.c,v 1.15 2008/04/28 20:23:30 martin 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 1.15 2008/04/28 20:23:30 martin 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 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         uvmexp.intrs++;
 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