* Copyright (c) 2006 Itronix Inc.

/* $NetBSD: aurtc.c,v 1.14 2012/01/03 07:36:02 kiyohara Exp $ */

/*-
* Copyright (c) 2006 Itronix Inc.
* All rights reserved.
*
* Written by Garrett D'Amore for Itronix Inc.
*
* 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.
* 3. The name of Itronix Inc. may not be used to endorse
* or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``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 ITRONIX INC. 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.
*/

/*
* Copyright 2002 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Simon Burge for Wasabi Systems, Inc.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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: aurtc.c,v 1.14 2012/01/03 07:36:02 kiyohara Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/device.h>
#include <sys/proc.h>

#include <dev/clock_subr.h>

#include <sys/bus.h>

#include <mips/alchemy/include/aureg.h>
#include <mips/alchemy/include/auvar.h>
#include <mips/alchemy/include/aubusvar.h>

#define REGVAL(x) (*(volatile uint32_t *)(MIPS_PHYS_TO_KSEG1(PC_BASE + (x))))
#define GETREG(x) (REGVAL(x))
#define PUTREG(x,v) (REGVAL(x) = (v))

struct aurtc_softc {
device_t sc_dev;
struct todr_chip_handle sc_tch;
void *sc_shutdownhook;
};

static int aurtc_match(device_t, struct cfdata *, void *);
static void aurtc_attach(device_t, device_t, void *);
static int aurtc_gettime(todr_chip_handle_t, struct timeval *);
static int aurtc_settime(todr_chip_handle_t, struct timeval *);
static void aurtc_shutdown(void *);

CFATTACH_DECL_NEW(aurtc, sizeof (struct aurtc_softc),
aurtc_match, aurtc_attach, NULL, NULL);

int
aurtc_match(device_t parent, struct cfdata *match, void *aux)
{
struct aubus_attach_args *aa = aux;

if (strcmp(aa->aa_name, match->cf_name) == 0)
return (1);

return (0);
}

void
aurtc_attach(device_t parent, device_t self, void *aux)
{
struct aurtc_softc *sc = device_private(self);

printf(": Au1X00 programmable clock\n");

sc->sc_dev = self;
sc->sc_tch.cookie = sc;
sc->sc_tch.bus_cookie = NULL;
sc->sc_tch.todr_gettime = aurtc_gettime;
sc->sc_tch.todr_settime = aurtc_settime;
sc->sc_tch.todr_setwen = NULL;

sc->sc_shutdownhook = shutdownhook_establish(aurtc_shutdown, NULL);

todr_attach(&sc->sc_tch);
}

/*
* Note that our RTC only has second resolution.
*/

int
aurtc_gettime(todr_chip_handle_t tch, struct timeval *tv)
{
int s;

s = splclock();
tv->tv_sec = GETREG(PC_COUNTER_READ_0);
splx(s);
return 0;
}

int
aurtc_settime(todr_chip_handle_t tch, struct timeval *tvp)
{
int s;
struct timeval tv;

s = splclock();
tv = *tvp;
splx(s);

/* wait for the clock register to be idle */
while (GETREG(PC_COUNTER_CONTROL) & CC_C0S) {
continue;
}

PUTREG(PC_COUNTER_WRITE0, tv.tv_sec);

/*
* It could take a second or two for the clock change to take effect.
* We don't want to make settimeofday() take that long, so we don't
* wait here, but instead wait in flush. This can have a bad effect
* for settimeofday() calls with a short window between them.
*/
return 0;
}

void
aurtc_shutdown(void *arg)
{

/* wait for the clock register to be idle */
while (GETREG(PC_COUNTER_CONTROL) & CC_C0S) {
continue;
}
}