/*      $NetBSD: ms_zs.c,v 1.20 2013/11/07 02:38:07 christos Exp $      */

/*
* Copyright (c) 1992, 1993
*      The Regents of the University of California.  All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Lawrence Berkeley Laboratory.
*
* 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. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
*      @(#)ms.c        8.1 (Berkeley) 6/11/93
*/

/*
* Mouse driver (/dev/mouse)
*/

/*
* Zilog Z8530 Dual UART driver (mouse interface)
*
* This is the "slave" driver that will be attached to
* the "zsc" driver for a Sun mouse.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ms_zs.c,v 1.20 2013/11/07 02:38:07 christos Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/time.h>
#include <sys/select.h>
#include <sys/syslog.h>

#include <machine/vuid_event.h>

#include <dev/ic/z8530reg.h>
#include <machine/z8530var.h>
#include <dev/sun/event_var.h>
#include <dev/sun/msvar.h>

static void ms_zs_rxint(struct zs_chanstate *);
static void ms_zs_stint(struct zs_chanstate *, int);
static void ms_zs_txint(struct zs_chanstate *);
static void ms_zs_softint(struct zs_chanstate *);

struct zsops zsops_ms = {
       ms_zs_rxint,    /* receive char available */
       ms_zs_stint,    /* external/status */
       ms_zs_txint,    /* xmit buffer empty */
       ms_zs_softint,  /* process software interrupt */
};

/* Fall-back baud rate */
#ifdef SUN_MS_BPS
int     ms_zs_bps = SUN_MS_BPS;
#else
int     ms_zs_bps = MS_DEFAULT_BPS;
#endif

static int      ms_zs_match(device_t, cfdata_t, void *);
static void     ms_zs_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(ms_zs, sizeof(struct ms_softc),
   ms_zs_match, ms_zs_attach, NULL, NULL);

/*
* ms_match: how is this zs channel configured?
*/
int
ms_zs_match(device_t parent, cfdata_t cf, void *aux)
{
       struct zsc_attach_args *args = aux;

       if (ms_zs_bps == 0)
               return 0;

       /* Exact match required for keyboard. */
       if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel)
               return 2;

       return 0;
}

void
ms_zs_attach(device_t parent, device_t self, void *aux)

{
       struct zsc_softc *zsc = device_private(parent);
       struct ms_softc *ms = device_private(self);
       struct zsc_attach_args *args = aux;
       struct zs_chanstate *cs;
       int channel;
       int reset, s;
       int bps;

       ms->ms_dev = self;
       channel = args->channel;
       cs = zsc->zsc_cs[channel];
       cs->cs_private = ms;
       cs->cs_ops = &zsops_ms;
       ms->ms_cs = cs;
       /* Allow kernel option SUN_MS_BPS to hard-code baud rate */
#ifndef SUN_MS_BPS
       if ((bps = cs->cs_defspeed) == 0)
#endif
               bps = ms_zs_bps;

       aprint_normal(": baud rate %d\n", bps);

       /* Initialize the speed, etc. */
       s = splzs();
       /* May need reset... */
       reset = (channel == 0) ?
           ZSWR9_A_RESET : ZSWR9_B_RESET;
       zs_write_reg(cs, 9, reset);
       /* These are OK as set by zscc: WR3, WR4, WR5 */
       /* We don't care about status or tx interrupts. */
       cs->cs_preg[1] = ZSWR1_RIE;
       (void)zs_set_speed(cs, bps);
       zs_loadchannelregs(cs);
       splx(s);

       /* Initialize translator. */
       ms->ms_byteno = -1;
}

/****************************************************************
* Interface to the lower layer (zscc)
****************************************************************/

static void
ms_zs_rxint(struct zs_chanstate *cs)
{
       struct ms_softc *ms;
       int put, put_next;
       uint8_t c, rr1;

       ms = cs->cs_private;
       put = ms->ms_rbput;

       /*
        * First read the status, because reading the received char
        * destroys the status of this char.
        */
       rr1 = zs_read_reg(cs, 1);
       c = zs_read_data(cs);

       if (rr1 & (ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) {
               /* Clear the receive error. */
               zs_write_csr(cs, ZSWR0_RESET_ERRORS);
       }

       ms->ms_rbuf[put] = (c << 8) | rr1;
       put_next = (put + 1) & MS_RX_RING_MASK;

       /* Would overrun if increment makes (put==get). */
       if (put_next == ms->ms_rbget) {
               ms->ms_intr_flags |= INTR_RX_OVERRUN;
       } else {
               /* OK, really increment. */
               put = put_next;
       }

       /* Done reading. */
       ms->ms_rbput = put;

       /* Ask for softint() call. */
       cs->cs_softreq = 1;
}

static void
ms_zs_txint(struct zs_chanstate *cs)
{
       struct ms_softc *ms;

       ms = cs->cs_private;
       zs_write_csr(cs, ZSWR0_RESET_TXINT);
       ms->ms_intr_flags |= INTR_TX_EMPTY;
       /* Ask for softint() call. */
       cs->cs_softreq = 1;
}

static void
ms_zs_stint(struct zs_chanstate *cs, int force)
{
       struct ms_softc *ms;
       uint8_t rr0;

       ms = cs->cs_private;

       rr0 = zs_read_csr(cs);
       zs_write_csr(cs, ZSWR0_RESET_STATUS);

       /*
        * We have to accumulate status line changes here.
        * Otherwise, if we get multiple status interrupts
        * before the softint runs, we could fail to notice
        * some status line changes in the softint routine.
        * Fix from Bill Studenmund, October 1996.
        */
       cs->cs_rr0_delta |= (cs->cs_rr0 ^ rr0);
       cs->cs_rr0 = rr0;
       ms->ms_intr_flags |= INTR_ST_CHECK;

       /* Ask for softint() call. */
       cs->cs_softreq = 1;
}

static void
ms_zs_softint(struct zs_chanstate *cs)
{
       struct ms_softc *ms;
       int get, c, s;
       int intr_flags;
       uint16_t ring_data;

       ms = cs->cs_private;

       /* Atomically get and clear flags. */
       s = splzs();
       intr_flags = ms->ms_intr_flags;
       ms->ms_intr_flags = 0;

       /* Now lower to spltty for the rest. */
       (void)spltty();

       /*
        * Copy data from the receive ring to the event layer.
        */
       get = ms->ms_rbget;
       while (get != ms->ms_rbput) {
               ring_data = ms->ms_rbuf[get];
               get = (get + 1) & MS_RX_RING_MASK;

               /* low byte of ring_data is rr1 */
               c = (ring_data >> 8) & 0xff;

               if (ring_data & ZSRR1_DO)
                       intr_flags |= INTR_RX_OVERRUN;
               if (ring_data & (ZSRR1_FE | ZSRR1_PE)) {
                       log(LOG_ERR, "%s: input error (0x%x)\n",
                           device_xname(ms->ms_dev), ring_data);
                       c = -1; /* signal input error */
               }

               /* Pass this up to the "middle" layer. */
               ms_input(ms, c);
       }
       if (intr_flags & INTR_RX_OVERRUN) {
               log(LOG_ERR, "%s: input overrun\n",
                   device_xname(ms->ms_dev));
       }
       ms->ms_rbget = get;

       if (intr_flags & INTR_TX_EMPTY) {
               /*
                * Transmit done.  (Not expected.)
                */
               log(LOG_ERR, "%s: transmit interrupt?\n",
                   device_xname(ms->ms_dev));
       }

       if (intr_flags & INTR_ST_CHECK) {
               /*
                * Status line change.  (Not expected.)
                */
               log(LOG_ERR, "%s: status interrupt?\n",
                   device_xname(ms->ms_dev));
               cs->cs_rr0_delta = 0;
       }

       splx(s);
}

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