/* $NetBSD: pps_ppbus.c,v 1.16 2014/07/25 08:10:38 dholland Exp $ */

/* $NetBSD: pps_ppbus.c,v 1.16 2014/07/25 08:10:38 dholland Exp $ */

/*
* ported to timecounters by Frank Kardel 2006
*
* Copyright (c) 2004
* Matthias Drochner. 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 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 AUTHOR 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: pps_ppbus.c,v 1.16 2014/07/25 08:10:38 dholland Exp $");

#include "opt_ntp.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/proc.h>
#include <sys/ioctl.h>
#include <sys/timepps.h>

#include <dev/ppbus/ppbus_base.h>
#include <dev/ppbus/ppbus_device.h>
#include <dev/ppbus/ppbus_io.h>
#include <dev/ppbus/ppbus_var.h>

struct pps_softc {
struct ppbus_device_softc pps_dev;
device_t ppbus;
int busy;
struct pps_state pps_state; /* pps state */
};

static int pps_probe(device_t, cfdata_t, void *);
static void pps_attach(device_t, device_t, void *);
CFATTACH_DECL_NEW(pps, sizeof(struct pps_softc), pps_probe, pps_attach,
NULL, NULL);
extern struct cfdriver pps_cd;

static dev_type_open(ppsopen);
static dev_type_close(ppsclose);
static dev_type_ioctl(ppsioctl);
const struct cdevsw pps_cdevsw = {
.d_open = ppsopen,
.d_close = ppsclose,
.d_read = noread,
.d_write = nowrite,
.d_ioctl = ppsioctl,
.d_stop = nostop,
.d_tty = notty,
.d_poll = nopoll,
.d_mmap = nommap,
.d_kqfilter = nokqfilter,
.d_discard = nodiscard,
.d_flag = D_OTHER
};

static void ppsintr(void *arg);

static int
pps_probe(device_t parent, cfdata_t match, void *aux)
{
struct ppbus_attach_args *args = aux;

/* we need an interrupt */
if (!(args->capabilities & PPBUS_HAS_INTR))
return 0;

return 1;
}

static void
pps_attach(device_t parent, device_t self, void *aux)
{
struct pps_softc *sc = device_private(self);

sc->ppbus = parent;
sc->pps_dev.sc_dev = self;

printf("\n");
}

static int
ppsopen(dev_t dev, int flags, int fmt, struct lwp *l)
{
struct pps_softc *sc;
int res, weg = 0;

sc = device_lookup_private(&pps_cd, minor(dev));
if (!sc)
return (ENXIO);

if (sc->busy)
return (0);

if (ppbus_request_bus(sc->ppbus, sc->pps_dev.sc_dev,
PPBUS_WAIT|PPBUS_INTR, 0))
return (EINTR);

ppbus_write_ivar(sc->ppbus, PPBUS_IVAR_IEEE, &weg);

/* attach the interrupt handler */
/* XXX priority should be set here */
res = ppbus_add_handler(sc->ppbus, ppsintr, sc);
if (res) {
ppbus_release_bus(sc->ppbus, sc->pps_dev.sc_dev,
PPBUS_WAIT, 0);
return (res);
}

ppbus_set_mode(sc->ppbus, PPBUS_PS2, 0);
ppbus_wctr(sc->ppbus, IRQENABLE | PCD | nINIT | SELECTIN);

mutex_spin_enter(&timecounter_lock);
memset((void *)&sc->pps_state, 0, sizeof(sc->pps_state));
sc->pps_state.ppscap = PPS_CAPTUREASSERT;
pps_init(&sc->pps_state);
mutex_spin_exit(&timecounter_lock);

sc->busy = 1;

return (0);
}

static int
ppsclose(dev_t dev, int flags, int fmt, struct lwp *l)
{
struct pps_softc *sc = device_lookup_private(&pps_cd, minor(dev));
device_t ppbus = sc->ppbus;

sc->busy = 0;
mutex_spin_enter(&timecounter_lock);
sc->pps_state.ppsparam.mode = 0;
mutex_spin_exit(&timecounter_lock);

ppbus_wdtr(ppbus, 0);
ppbus_wctr(ppbus, 0);

ppbus_remove_handler(ppbus, ppsintr);
ppbus_set_mode(ppbus, PPBUS_COMPATIBLE, 0);
ppbus_release_bus(ppbus, sc->pps_dev.sc_dev, PPBUS_WAIT, 0);
return (0);
}

static void
ppsintr(void *arg)
{
struct pps_softc *sc = arg;
device_t ppbus = sc->ppbus;

mutex_spin_enter(&timecounter_lock);
pps_capture(&sc->pps_state);
if (!(ppbus_rstr(ppbus) & nACK)) {
mutex_spin_exit(&timecounter_lock);
return;
}
if (sc->pps_state.ppsparam.mode & PPS_ECHOASSERT)
ppbus_wctr(ppbus, IRQENABLE | AUTOFEED);
pps_event(&sc->pps_state, PPS_CAPTUREASSERT);
if (sc->pps_state.ppsparam.mode & PPS_ECHOASSERT)
ppbus_wctr(ppbus, IRQENABLE);
mutex_spin_exit(&timecounter_lock);
}

static int
ppsioctl(dev_t dev, u_long cmd, void *data, int flags, struct lwp *l)
{
struct pps_softc *sc = device_lookup_private(&pps_cd, minor(dev));
int error = 0;

switch (cmd) {
case PPS_IOC_CREATE:
case PPS_IOC_DESTROY:
case PPS_IOC_GETPARAMS:
case PPS_IOC_SETPARAMS:
case PPS_IOC_GETCAP:
case PPS_IOC_FETCH:
#ifdef PPS_SYNC
case PPS_IOC_KCBIND:
#endif
mutex_spin_enter(&timecounter_lock);
error = pps_ioctl(cmd, data, &sc->pps_state);
mutex_spin_exit(&timecounter_lock);
break;

default:
error = EPASSTHROUGH;
break;
}
return (error);
}