/*      $NetBSD: pcons.c,v 1.34 2014/07/25 08:10:35 dholland Exp $      */

/*-
* Copyright (c) 2000 Eduardo E. Horvath
* 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.
* 3. The name of the author may not be used to endorse or promote products
*    derived from this software without specific prior written permission.
*
* 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 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.
*/

/*
* Default console driver.  Uses the PROM or whatever
* driver(s) are appropriate.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pcons.c,v 1.34 2014/07/25 08:10:35 dholland Exp $");

#include "opt_ddb.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/tty.h>
#include <sys/time.h>
#include <sys/syslog.h>
#include <sys/kauth.h>

#include <machine/autoconf.h>
#include <machine/openfirm.h>
#include <machine/cpu.h>
#include <machine/eeprom.h>
#include <machine/psl.h>

#include <dev/cons.h>

#include <sparc64/dev/cons.h>

static int pconsmatch(device_t, cfdata_t, void *);
static void pconsattach(device_t, device_t, void *);

CFATTACH_DECL_NEW(pcons, sizeof(struct pconssoftc),
   pconsmatch, pconsattach, NULL, NULL);

extern struct cfdriver pcons_cd;

dev_type_open(pconsopen);
dev_type_close(pconsclose);
dev_type_read(pconsread);
dev_type_write(pconswrite);
dev_type_ioctl(pconsioctl);
dev_type_tty(pconstty);
dev_type_poll(pconspoll);

const struct cdevsw pcons_cdevsw = {
       .d_open = pconsopen,
       .d_close = pconsclose,
       .d_read = pconsread,
       .d_write = pconswrite,
       .d_ioctl = pconsioctl,
       .d_stop = nostop,
       .d_tty = pconstty,
       .d_poll = pconspoll,
       .d_mmap = nommap,
       .d_kqfilter = ttykqfilter,
       .d_discard = nodiscard,
       .d_flag = D_TTY
};

static struct cnm_state pcons_cnm_state;

static int pconsprobe(void);
extern struct consdev *cn_tab;

static int
pconsmatch(device_t parent, cfdata_t match, void *aux)
{
       struct mainbus_attach_args *ma = aux;
       extern int  prom_cngetc(dev_t);

       /* Only attach if no other console has attached. */
       return ((strcmp("pcons", ma->ma_name) == 0) &&
               (cn_tab->cn_getc == prom_cngetc));

}

static void
pconsattach(device_t parent, device_t self, void *aux)
{
       struct pconssoftc *sc = device_private(self);
       sc->of_dev = self;

       printf("\n");
       if (!pconsprobe())
               return;

       cn_init_magic(&pcons_cnm_state);
       cn_set_magic("+++++");
       callout_init(&sc->sc_poll_ch, 0);
}

static void pconsstart(struct tty *);
static int pconsparam(struct tty *, struct termios *);
static void pcons_poll(void *);

int
pconsopen(dev_t dev, int flag, int mode, struct lwp *l)
{
       struct pconssoftc *sc;
       struct tty *tp;

       sc = device_lookup_private(&pcons_cd, minor(dev));
       if (!sc)
               return ENXIO;
       if (!(tp = sc->of_tty))
               sc->of_tty = tp = tty_alloc();
       tp->t_oproc = pconsstart;
       tp->t_param = pconsparam;
       tp->t_dev = dev;
       cn_tab->cn_dev = dev;
       if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
               return (EBUSY);
       if (!(tp->t_state & TS_ISOPEN)) {
               ttychars(tp);
               tp->t_iflag = TTYDEF_IFLAG;
               tp->t_oflag = TTYDEF_OFLAG;
               tp->t_cflag = TTYDEF_CFLAG;
               tp->t_lflag = TTYDEF_LFLAG;
               tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
               pconsparam(tp, &tp->t_termios);
               ttsetwater(tp);
       }
       tp->t_state |= TS_CARR_ON;

       if (!(sc->of_flags & OFPOLL)) {
               sc->of_flags |= OFPOLL;
               callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
       }

       return (*tp->t_linesw->l_open)(dev, tp);
}

int
pconsclose(dev_t dev, int flag, int mode, struct lwp *l)
{
       struct pconssoftc *sc = device_lookup_private(&pcons_cd,minor(dev));
       struct tty *tp = sc->of_tty;

       callout_stop(&sc->sc_poll_ch);
       sc->of_flags &= ~OFPOLL;
       (*tp->t_linesw->l_close)(tp, flag);
       ttyclose(tp);
       return 0;
}

int
pconsread(dev_t dev, struct uio *uio, int flag)
{
       struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
       struct tty *tp = sc->of_tty;

       return (*tp->t_linesw->l_read)(tp, uio, flag);
}

int
pconswrite(dev_t dev, struct uio *uio, int flag)
{
       struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
       struct tty *tp = sc->of_tty;

       return (*tp->t_linesw->l_write)(tp, uio, flag);
}

int
pconspoll(dev_t dev, int events, struct lwp *l)
{
       struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
       struct tty *tp = sc->of_tty;

       return ((*tp->t_linesw->l_poll)(tp, events, l));
}

int
pconsioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
       struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
       struct tty *tp = sc->of_tty;
       int error;

       if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l)) != EPASSTHROUGH)
               return error;
       return ttioctl(tp, cmd, data, flag, l);
}

struct tty *
pconstty(dev_t dev)
{
       struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));

       return sc->of_tty;
}

static void
pconsstart(struct tty *tp)
{
       struct clist *cl;
       int s, len;
       u_char buf[OFBURSTLEN];

       s = spltty();
       if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
               splx(s);
               return;
       }
       tp->t_state |= TS_BUSY;
       splx(s);
       cl = &tp->t_outq;
       len = q_to_b(cl, buf, OFBURSTLEN);
       prom_write(prom_stdout(), buf, len);
       s = spltty();
       tp->t_state &= ~TS_BUSY;
       if (ttypull(tp)) {
               tp->t_state |= TS_TIMEOUT;
               callout_schedule(&tp->t_rstrt_ch, 1);
       }
       splx(s);
}

static int
pconsparam(struct tty *tp, struct termios *t)
{
       tp->t_ispeed = t->c_ispeed;
       tp->t_ospeed = t->c_ospeed;
       tp->t_cflag = t->c_cflag;
       return 0;
}

static void
pcons_poll(void *aux)
{
       struct pconssoftc *sc = aux;
       struct tty *tp = sc->of_tty;
       char ch;

       while (prom_read(prom_stdin(), &ch, 1) > 0) {
               cn_check_magic(tp->t_dev, ch, pcons_cnm_state);
               if (tp && (tp->t_state & TS_ISOPEN))
                       (*tp->t_linesw->l_rint)(ch, tp);
       }
       callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
}

int
pconsprobe(void)
{

       return (prom_stdin() && prom_stdout());
}

void
pcons_cnpollc(dev_t dev, int on)
{
       struct pconssoftc *sc;

       sc = device_lookup_private(&pcons_cd, minor(dev));
       if (sc == NULL)
               return;

       if (on) {
               if (sc->of_flags & OFPOLL)
                       callout_stop(&sc->sc_poll_ch);
               sc->of_flags &= ~OFPOLL;
       } else {
               /* Resuming kernel. */
               if (!(sc->of_flags & OFPOLL)) {
                       sc->of_flags |= OFPOLL;
                       callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
               }
       }
}

void pcons_dopoll(void);
void
pcons_dopoll(void)
{
               pcons_poll(device_lookup_private(&pcons_cd, 0));
}

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