* Copyright (c) 2010, 2011 The NetBSD Foundation, Inc.

/* $NetBSD: ds1553rtc.c,v 1.2 2011/01/18 01:10:25 matt Exp $ */
/*-
* Copyright (c) 2010, 2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Raytheon BBN Technologies Corp and Defense Advanced Research Projects
* Agency and which was developed by Matt Thomas of 3am Software Foundry.
*
* This material is based upon work supported by the Defense Advanced Research
* Projects Agency and Space and Naval Warfare Systems Center, Pacific, under
* Contract No. N66001-09-C-2073.
* Approved for Public Release, Distribution Unlimited
*
* 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 "locators.h"

#include <sys/cdefs.h>

__KERNEL_RCSID(0, "$NetBSD: ds1553rtc.c,v 1.2 2011/01/18 01:10:25 matt Exp $");

#include <sys/param.h>
#include <sys/cpu.h>
#include <sys/device.h>
#include <sys/tty.h>

#include "ioconf.h"

#include <sys/intr.h>
#include <sys/bus.h>

#include <dev/clock_subr.h>
#include <dev/ic/mk48txxvar.h>

#include <powerpc/booke/cpuvar.h>

static int ds1553rtc_match(device_t, cfdata_t, void *);
static void ds1553rtc_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(ds1553rtc, sizeof(struct mk48txx_softc),
ds1553rtc_match, ds1553rtc_attach, NULL, NULL);

static int
ds1553rtc_match(device_t parent, cfdata_t cf, void *aux)
{
struct generic_attach_args * const ga = aux;
bus_space_handle_t bsh;
int error;
int rv;
uint8_t saved_data, new_data;
bus_size_t size = ga->ga_size;

if (ga->ga_addr == OBIOCF_ADDR_DEFAULT)
return 0;
if (size == OBIOCF_SIZE_DEFAULT)
size = 8192;

/*
* If this is NVRAM+RTC, make sure we can modify the NVRAM.
*/
error = bus_space_map(ga->ga_bst, ga->ga_addr, size, 0, &bsh);
if (error)
return 0;

bus_size_t target = size - 17;
saved_data = bus_space_read_1(ga->ga_bst, bsh, target);
bus_space_write_1(ga->ga_bst, bsh, target, ~saved_data);
new_data = bus_space_read_1(ga->ga_bst, bsh, target);
rv = (new_data == (uint8_t) ~saved_data);
bus_space_write_1(ga->ga_bst, bsh, target, saved_data);

bus_space_unmap(ga->ga_bst, bsh, size);

return rv;
}

static void
ds1553rtc_attach(device_t parent, device_t self, void *aux)
{
struct mk48txx_softc * const sc = device_private(self);
struct generic_attach_args * const ga = aux;
int error;
bus_size_t size = ga->ga_size;

if (size == OBIOCF_SIZE_DEFAULT)
size = 8192;

sc->sc_dev = self;
sc->sc_bst = ga->ga_bst;
sc->sc_model = "ds1553";
sc->sc_flag = MK48TXX_HAVE_CENT_REG;
error = bus_space_map(sc->sc_bst, ga->ga_addr, size, 0, &sc->sc_bsh);
if (error) {
aprint_error(": failed to map registers: %d\n", error);
return;
}

mk48txx_attach(sc);
aprint_normal("\n");
}