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/* $NetBSD: timer_hb.c,v 1.19 2011/11/22 14:31:02 tsutsui Exp $ */
/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: timer_hb.c,v 1.19 2011/11/22 14:31:02 tsutsui Exp $");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/intr.h>
#include <uvm/uvm_extern.h>
#include <machine/cpu.h>
#include <machine/bus.h>
#include <dev/clock_subr.h>
#include <news68k/news68k/isr.h>
#include <news68k/news68k/clockvar.h>
#include <news68k/dev/hbvar.h>
#include "ioconf.h"
/*
* interrupt level for clock
*/
#define TIMER_LEVEL 6
#define TIMER_SIZE 8 /* XXX */
static int timer_hb_match(device_t, cfdata_t, void *);
static void timer_hb_attach(device_t, device_t, void *);
static void timer_hb_initclocks(int, int);
void clock_intr(struct clockframe *);
static inline void leds_intr(void);
extern void _isr_clock(void); /* locore.s */
CFATTACH_DECL_NEW(timer_hb, 0,
timer_hb_match, timer_hb_attach, NULL, NULL);
static volatile uint8_t *ctrl_timer; /* XXX */
extern volatile u_char *ctrl_led; /* XXX */
static int
timer_hb_match(device_t parent, cfdata_t cf, void *aux)
{
struct hb_attach_args *ha = aux;
static int timer_hb_matched;
/* Only one timer, please. */
if (timer_hb_matched)
return 0;
if (strcmp(ha->ha_name, timer_cd.cd_name))
return 0;
if (ha->ha_ipl == -1)
ha->ha_ipl = TIMER_LEVEL;
ha->ha_size = TIMER_SIZE;
timer_hb_matched = 1;
return 1;
}
static void
timer_hb_attach(device_t parent, device_t self, void *aux)
{
struct hb_attach_args *ha = aux;
if (ha->ha_ipl != TIMER_LEVEL)
panic("clock_hb_attach: wrong interrupt level");
ctrl_timer = (uint8_t *)(ha->ha_address); /* XXX needs bus_space */
printf("\n");
timer_config(timer_hb_initclocks);
#if 0 /* XXX this will be done in timer_hb_initclocks() */
isrlink_custom(ha->ha_ipl, (void *)_isr_clock);
#endif
}
/*
* Set up the interval timer (enable clock interrupts).
* Leave stathz 0 since there is no secondary clock available.
* Note that clock interrupts MUST STAY DISABLED until here.
*/
static void
timer_hb_initclocks(int prof, int stat)
{
int s;
s = splhigh();
/* Install isr (in locore.s) that calls clock_intr(). */
isrlink_custom(TIMER_LEVEL, (void *)_isr_clock);
/* enable the clock */
*ctrl_timer = 1;
splx(s);
}
/*
* Clock interrupt handler.
* This is called by the "custom" interrupt handler.
*
* from sun3/sun3x/clock.c -tsutsui
*/
void
clock_intr(struct clockframe *cf)
{
#ifdef LED_IDLE_CHECK
extern char _Idle[]; /* locore.s */
#endif
/* Pulse the clock intr. enable low. */
*ctrl_timer = 0;
*ctrl_timer = 1;
intrcnt[TIMER_LEVEL]++;
/* Entertainment! */
#ifdef LED_IDLE_CHECK
if (cf.cf_pc == (long)_Idle)
#endif
leds_intr();
/* Call common clock interrupt handler. */
hardclock(cf);
curcpu()->ci_data.cpu_nintr++;
}
/* heartbeat LED */
#define LED0 0x01
#define LED1 0x02
static inline void
leds_intr(void)
{
static u_char led_countdown, led_stat;
u_char i;
if (led_countdown) {
led_countdown--;
return;
}
i = led_stat ^ LED0;
*ctrl_led = i;
led_stat = i;
led_countdown = hz;
}
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