/*      $NetBSD: lpt.c,v 1.82 2018/09/03 16:29:31 riastradh Exp $       */

/*
* 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 AT style parallel printer port
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: lpt.c,v 1.82 2018/09/03 16:29:31 riastradh Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/malloc.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/intr.h>

#include <sys/bus.h>

#include <dev/ic/lptreg.h>
#include <dev/ic/lptvar.h>

#include "ioconf.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

#define LPTDEBUG

#ifndef LPTDEBUG
#define LPRINTF(a)
#else
#define LPRINTF(a)      if (lptdebug) printf a
int lptdebug = 0;
#endif

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 = D_OTHER
};

#define LPTUNIT(s)      (minor(s) & 0x1f)
#define LPTFLAGS(s)     (minor(s) & 0xe0)

static void     lptsoftintr(void *);

void
lpt_attach_subr(struct lpt_softc *sc)
{
       bus_space_tag_t iot;
       bus_space_handle_t ioh;

       sc->sc_state = 0;

       iot = sc->sc_iot;
       ioh = sc->sc_ioh;

       bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT);

       callout_init(&sc->sc_wakeup_ch, 0);
       sc->sc_sih = softint_establish(SOFTINT_SERIAL, lptsoftintr, sc);

       sc->sc_dev_ok = 1;
}

int
lpt_detach_subr(device_t self, int flags)
{
       struct lpt_softc *sc = device_private(self);

       sc->sc_dev_ok = 0;
       softint_disestablish(sc->sc_sih);
       callout_destroy(&sc->sc_wakeup_ch);
       return 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 = LPTFLAGS(dev);
       struct lpt_softc *sc;
       bus_space_tag_t iot;
       bus_space_handle_t ioh;
       u_char control;
       int error;
       int spin;

       sc = device_lookup_private(&lpt_cd, LPTUNIT(dev));
       if (!sc || !sc->sc_dev_ok)
               return ENXIO;

#if 0   /* XXX what to do? */
       if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0)
               return ENXIO;
#endif

#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(("%s: open: flags=0x%x\n", device_xname(sc->sc_dev),
           (unsigned)flags));
       iot = sc->sc_iot;
       ioh = sc->sc_ioh;

       if ((flags & LPT_NOPRIME) == 0) {
               /* assert INIT for 100 usec to start up printer */
               bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT);
               delay(100);
       }

       control = LPC_SELECT | LPC_NINIT;
       bus_space_write_1(iot, ioh, lpt_control, control);

       /* wait till ready (printer running diagnostics) */
       for (spin = 0; NOT_READY_ERR(); 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;
               }
       }

       if ((flags & LPT_NOINTR) == 0)
               control |= LPC_IENABLE;
       if (flags & LPT_AUTOLF)
               control |= LPC_AUTOLF;
       sc->sc_control = control;
       bus_space_write_1(iot, ioh, lpt_control, control);

       sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK);
       sc->sc_count = 0;
       sc->sc_state = LPT_OPEN;

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

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

int
lptnotready(u_char status, struct lpt_softc *sc)
{
       u_char new;

       status = (status ^ LPS_INVERT) & LPS_MASK;
       new = status & ~sc->sc_laststatus;
       sc->sc_laststatus = status;

       if (sc->sc_state & LPT_OPEN) {
               if (new & LPS_SELECT)
                       log(LOG_NOTICE,
                           "%s: offline\n", device_xname(sc->sc_dev));
               else if (new & LPS_NOPAPER)
                       log(LOG_NOTICE,
                           "%s: out of paper\n", device_xname(sc->sc_dev));
               else if (new & LPS_NERR)
                       log(LOG_NOTICE,
                           "%s: output error\n", device_xname(sc->sc_dev));
       }

       return status;
}

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

       s = splvm();
       lptintr(sc);
       splx(s);

       callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, 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 =
           device_lookup_private(&lpt_cd, LPTUNIT(dev));
       bus_space_tag_t iot = sc->sc_iot;
       bus_space_handle_t ioh = sc->sc_ioh;

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

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

       bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT);
       sc->sc_state = 0;
       bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT);
       free(sc->sc_inbuf, M_DEVBUF);

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

int
lptpushbytes(struct lpt_softc *sc)
{
       bus_space_tag_t iot = sc->sc_iot;
       bus_space_handle_t ioh = sc->sc_ioh;
       int error;

       if (sc->sc_flags & LPT_NOINTR) {
               int spin, tic;
               u_char control = sc->sc_control;

               while (sc->sc_count > 0) {
                       spin = 0;
                       while (NOT_READY()) {
                               if (++spin < sc->sc_spinmax)
                                       continue;
                               tic = 0;
                               /* adapt busy-wait algorithm */
                               sc->sc_spinmax++;
                               while (NOT_READY_ERR()) {
                                       /* 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;
                       }

                       bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++);
                       DELAY(1);
                       bus_space_write_1(iot, ioh, lpt_control,
                           control | LPC_STROBE);
                       DELAY(1);
                       sc->sc_count--;
                       bus_space_write_1(iot, ioh, lpt_control, control);
                       DELAY(1);

                       /* adapt busy-wait algorithm */
                       if (spin*2 + 16 < sc->sc_spinmax)
                               sc->sc_spinmax--;
               }
       } else {
               int s;

               while (sc->sc_count > 0) {
                       /* if the printer is ready for a char, give it one */
                       if ((sc->sc_state & LPT_OBUSY) == 0) {
                               LPRINTF(("%s: write %lu\n",
                                   device_xname(sc->sc_dev),
                                   (u_long)sc->sc_count));
                               s = splvm();
                               (void) lptintr(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 =
           device_lookup_private(&lpt_cd, LPTUNIT(dev));
       size_t n;
       int error = 0;

       while ((n = uimin(LPT_BSIZE, uio->uio_resid)) != 0) {
               uiomove(sc->sc_cp = sc->sc_inbuf, n, uio);
               sc->sc_count = n;
               error = lptpushbytes(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
lptintr(void *arg)
{
       struct lpt_softc *sc = arg;
       bus_space_tag_t iot = sc->sc_iot;
       bus_space_handle_t ioh = sc->sc_ioh;

#if 0
       if ((sc->sc_state & LPT_OPEN) == 0)
               return 0;
#endif

       /* is printer online and ready for output */
       if (NOT_READY() && NOT_READY_ERR())
               return 0;

       if (sc->sc_count) {
               u_char control = sc->sc_control;
               /* send char */
               bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++);
               DELAY(1);
               bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE);
               DELAY(1);
               sc->sc_count--;
               bus_space_write_1(iot, ioh, lpt_control, control);
               DELAY(1);
               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 */
               softint_schedule(sc->sc_sih);
       }

       return 1;
}

static void
lptsoftintr(void *cookie)
{

       wakeup(cookie);
}

int
lptioctl(dev_t dev, u_long cmd, void *data,
   int flag, struct lwp *l)
{
       return ENODEV;
}

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