/*      $NetBSD: lpt_mvme.c,v 1.19 2018/09/03 16:29:32 riastradh Exp $  */

/*-
* Copyright (c) 1999, 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Steve C. Woodford.
*
* 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.
*/

/*
* Copyright (c) 1993, 1994 Charles M. Hannum.
* Copyright (c) 1990 William F. Jolitz, TeleMuse
* 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. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This software is a component of "386BSD" developed by
*      William F. Jolitz, TeleMuse.
* 4. Neither the name of the developer nor the name "386BSD"
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
* AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
* SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
* THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
* NOT MAKE USE OF THIS WORK.
*
* FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
* BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
* REFERENCES SUCH AS THE  "PORTING UNIX TO THE 386" SERIES
* (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
* JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
* LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
* ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
* OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``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 DEVELOPER 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.
*/

/*
* Device Driver for an MVME68K/MVME88K board's parallel printer port
* This driver attaches above the board-specific back-end.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: lpt_mvme.c,v 1.19 2018/09/03 16:29:32 riastradh Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/kernel.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/syslog.h>

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

#include <dev/mvme/lptvar.h>


#define TIMEOUT         hz*16   /* wait up to 16 seconds for a ready */
#define STEP            hz/4

#define LPTPRI          (PZERO+8)
#define LPT_BSIZE       1024

#if !defined(DEBUG) || !defined(notdef)
#define LPRINTF(a)
#else
#define LPRINTF         if (lptdebug) aprint_verbose_dev a
int lptdebug = 1;
#endif

#define LPTUNIT(s)      (minor(s) & 0x0f)
#define LPTFLAGS(s)     (minor(s) & 0xf0)

static void lpt_wakeup(void *arg);
static int pushbytes(struct lpt_softc *);

extern struct cfdriver lpt_cd;

dev_type_open(lptopen);
dev_type_close(lptclose);
dev_type_write(lptwrite);
dev_type_ioctl(lptioctl);

const struct cdevsw lpt_cdevsw = {
       .d_open = lptopen,
       .d_close = lptclose,
       .d_read = noread,
       .d_write = lptwrite,
       .d_ioctl = lptioctl,
       .d_stop = nostop,
       .d_tty = notty,
       .d_poll = nopoll,
       .d_mmap = nommap,
       .d_kqfilter = nokqfilter,
       .d_discard = nodiscard,
       .d_flag = 0
};

void
lpt_attach_subr(struct lpt_softc *sc)
{

       sc->sc_state = 0;
       callout_init(&sc->sc_wakeup_ch, 0);
}

/*
* Reset the printer, then wait until it's selected and not busy.
*/
int
lptopen(dev_t dev, int flag, int mode, struct lwp *l)
{
       u_char flags;
       struct lpt_softc *sc;
       int error;
       int spin;

       flags = LPTFLAGS(dev);

       sc = device_lookup_private(&lpt_cd, LPTUNIT(dev));
       if (!sc)
               return (ENXIO);

#ifdef DIAGNOSTIC
       if (sc->sc_state)
               aprint_verbose_dev(sc->sc_dev, "stat=0x%x not zero\n",
                   sc->sc_state);
#endif

       if (sc->sc_state)
               return (EBUSY);

       sc->sc_state = LPT_INIT;
       sc->sc_flags = flags;
       LPRINTF((sc->sc_dev, "open: flags=0x%x\n", flags));

       if ((flags & LPT_NOPRIME) == 0) {
               /* assert Input Prime for 100 usec to start up printer */
               (sc->sc_funcs->lf_iprime) (sc);
       }

       /* select fast or slow strobe depending on minor device number */
       if (flags & LPT_FAST_STROBE)
               (sc->sc_funcs->lf_speed) (sc, LPT_STROBE_FAST);
       else
               (sc->sc_funcs->lf_speed) (sc, LPT_STROBE_SLOW);

       /* wait till ready (printer running diagnostics) */
       for (spin = 0; (sc->sc_funcs->lf_notrdy) (sc, 1); spin += STEP) {
               if (spin >= TIMEOUT) {
                       sc->sc_state = 0;
                       return (EBUSY);
               }
               /* wait 1/4 second, give up if we get a signal */
               error = tsleep((void *) sc, LPTPRI | PCATCH, "lptopen", STEP);
               if (error != EWOULDBLOCK) {
                       sc->sc_state = 0;
                       return (error);
               }
       }

       sc->sc_inbuf = geteblk(LPT_BSIZE);
       sc->sc_count = 0;
       sc->sc_state = LPT_OPEN;

       if ((sc->sc_flags & LPT_NOINTR) == 0)
               lpt_wakeup(sc);

       (sc->sc_funcs->lf_open) (sc, sc->sc_flags & LPT_NOINTR);

       LPRINTF((sc->sc_dev, "opened\n"));
       return (0);
}

void
lpt_wakeup(void *arg)
{
       struct lpt_softc *sc;
       int s;

       sc = arg;

       s = spltty();
       lpt_intr(sc);
       splx(s);

       callout_reset(&sc->sc_wakeup_ch, STEP, lpt_wakeup, sc);
}

/*
* Close the device, and free the local line buffer.
*/
int
lptclose(dev_t dev, int flag, int mode, struct lwp *l)
{
       struct lpt_softc *sc;

       sc = device_lookup_private(&lpt_cd, LPTUNIT(dev));

       if (sc->sc_count)
               (void) pushbytes(sc);

       if ((sc->sc_flags & LPT_NOINTR) == 0)
               callout_stop(&sc->sc_wakeup_ch);

       (sc->sc_funcs->lf_close) (sc);

       sc->sc_state = 0;
       brelse(sc->sc_inbuf, 0);

       LPRINTF((sc->sc_dev, "%s: closed\n"));
       return (0);
}

int
pushbytes(struct lpt_softc *sc)
{
       int s, error, spin, tic;

       if (sc->sc_flags & LPT_NOINTR) {
               while (sc->sc_count > 0) {
                       spin = 0;
                       while ((sc->sc_funcs->lf_notrdy) (sc, 0)) {
                               if (++spin < sc->sc_spinmax)
                                       continue;
                               tic = 0;
                               /* adapt busy-wait algorithm */
                               sc->sc_spinmax++;
                               while ((sc->sc_funcs->lf_notrdy) (sc, 1)) {
                                       /* exponential backoff */
                                       tic = tic + tic + 1;
                                       if (tic > TIMEOUT)
                                               tic = TIMEOUT;
                                       error = tsleep((void *) sc,
                                           LPTPRI | PCATCH, "lptpsh", tic);
                                       if (error != EWOULDBLOCK)
                                               return (error);
                               }
                               break;
                       }

                       (sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++);
                       sc->sc_count--;

                       /* adapt busy-wait algorithm */
                       if (spin * 2 + 16 < sc->sc_spinmax)
                               sc->sc_spinmax--;
               }
       } else {
               while (sc->sc_count > 0) {
                       /* if the printer is ready for a char, give it one */
                       if ((sc->sc_state & LPT_OBUSY) == 0) {
                               LPRINTF((sc->sc_dev, "write %d\n",
                                       sc->sc_count));
                               s = spltty();
                               (void) lpt_intr(sc);
                               splx(s);
                       }
                       error = tsleep((void *) sc, LPTPRI | PCATCH,
                           "lptwrite2", 0);
                       if (error)
                               return (error);
               }
       }
       return (0);
}

/*
* Copy a line from user space to a local buffer, then call putc to get the
* chars moved to the output queue.
*/
int
lptwrite(dev_t dev, struct uio *uio, int flags)
{
       struct lpt_softc *sc;
       size_t n;
       int error;

       sc = device_lookup_private(&lpt_cd, LPTUNIT(dev));
       error = 0;

       while ((n = uimin(LPT_BSIZE, uio->uio_resid)) != 0) {
               uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio);
               sc->sc_count = n;
               error = pushbytes(sc);
               if (error) {
                       /*
                        * Return accurate residual if interrupted or timed
                        * out.
                        */
                       uio->uio_resid += sc->sc_count;
                       sc->sc_count = 0;
                       return (error);
               }
       }
       return (0);
}

/*
* Handle printer interrupts which occur when the printer is ready to accept
* another char.
*/
int
lpt_intr(struct lpt_softc *sc)
{

       if (sc->sc_count) {
               /* send char */
               (sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++);
               sc->sc_count--;
               sc->sc_state |= LPT_OBUSY;
       } else
               sc->sc_state &= ~LPT_OBUSY;

       if (sc->sc_count == 0) {
               /* none, wake up the top half to get more */
               wakeup((void *) sc);
       }

       return (1);
}

/* ARGSUSED */
int
lptioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{

       return (ENODEV);
}

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