xref: /src/sys/arch/hppa/dev/clock.c

/*	$NetBSD: clock.c,v 1.1 2014/02/24 07:23:42 skrll Exp $	*/

/*	$OpenBSD: clock.c,v 1.10 2001/08/31 03:13:42 mickey Exp $	*/

/*
 * Copyright (c) 1998-2003 Michael Shalayeff
 * All rights reserved.
 *
 * 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 AUTHOR ``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 AUTHOR OR HIS RELATIVES 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 MIND, 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: clock.c,v 1.1 2014/02/24 07:23:42 skrll Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/time.h>
#include <sys/timetc.h>

#include <machine/pdc.h>
#include <machine/iomod.h>
#include <machine/psl.h>
#include <machine/intr.h>
#include <machine/reg.h>
#include <machine/cpufunc.h>
#include <machine/autoconf.h>

#include <hppa/hppa/machdep.h>

#if defined(DDB)
#include <machine/db_machdep.h>
#include <ddb/db_sym.h>
#include <ddb/db_extern.h>
#endif

static unsigned get_itimer_count(struct timecounter *);

void
cpu_initclocks(void)
{
	static struct timecounter tc = {
		.tc_get_timecount = get_itimer_count,
		.tc_name = "itimer",
		.tc_counter_mask = ~0,
		.tc_quality = 100,
	};

	extern u_int cpu_hzticks;
	u_int time_inval;

	tc.tc_frequency = cpu_hzticks * hz;

	/* Start the interval timer. */
	mfctl(CR_ITMR, time_inval);
	mtctl(time_inval + cpu_hzticks, CR_ITMR);

	tc_init(&tc);
}

unsigned
get_itimer_count(struct timecounter *tc)
{
	uint32_t val;

	mfctl(CR_ITMR, val);

	return val;
}

int
clock_intr(void *v)
{
	struct clockframe *frame = v;
	extern u_int cpu_hzticks;
	u_int time_inval;

	/* Restart the interval timer. */
	mfctl(CR_ITMR, time_inval);
	mtctl(time_inval + cpu_hzticks, CR_ITMR);

	/* printf ("clock int 0x%x @ 0x%x for %p\n", t,
	   CLKF_PC(frame), curproc); */

	if (!cold)
		hardclock(frame);

#if 0
	ddb_regs = *frame;
	db_show_regs(NULL, 0, 0, NULL);
#endif

	/* printf ("clock out 0x%x\n", t); */

	return 1;
}

void
setstatclockrate(int newhz)
{
	/* nothing we can do */
}