/* $NetBSD: atppc_puc.c,v 1.16 2018/12/09 11:14:01 jdolecek Exp $ */

/*-
* Copyright (c) 2004 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jaromir Dolecek.
*
* 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.
*/

#include "opt_atppc.h"

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: atppc_puc.c,v 1.16 2018/12/09 11:14:01 jdolecek Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/syslog.h>
#include <sys/device.h>
#include <sys/proc.h>
#include <sys/termios.h>

#include <sys/bus.h>

#include <dev/pci/pcivar.h>
#include <dev/pci/pucvar.h>

#include <dev/ic/atppcvar.h>

static int      atppc_puc_match(device_t, cfdata_t, void *);
static void     atppc_puc_attach(device_t, device_t, void *);

struct atppc_puc_softc {
       /* Machine independent device data */
       struct atppc_softc sc_atppc;

       bus_dmamap_t sc_dmamap;
};

CFATTACH_DECL_NEW(atppc_puc, sizeof(struct atppc_puc_softc), atppc_puc_match,
   atppc_puc_attach, NULL, NULL);

static int atppc_puc_dma_setup(struct atppc_puc_softc *);
static int atppc_puc_dma_start(struct atppc_softc *, void *, u_int,
       u_int8_t);
static int atppc_puc_dma_finish(struct atppc_softc *);
static int atppc_puc_dma_abort(struct atppc_softc *);
static int atppc_puc_dma_malloc(device_t, void **, bus_addr_t *,
       bus_size_t);
static void atppc_puc_dma_free(device_t, void **, bus_addr_t *,
       bus_size_t);

/*
* atppc_acpi_match: autoconf(9) match routine
*/
static int
atppc_puc_match(device_t parent, cfdata_t match, void *aux)
{
       struct puc_attach_args *aa = aux;

       /*
        * Locators already matched, just check the type.
        */
       if (aa->type != PUC_PORT_TYPE_LPT)
               return (0);

       return (1);
}

static void
atppc_puc_attach(device_t parent, device_t self, void *aux)
{
       struct atppc_softc *sc = device_private(self);
       struct atppc_puc_softc *psc = device_private(self);
       struct puc_attach_args *aa = aux;
       const char *intrstr;
       char intrbuf[PCI_INTRSTR_LEN];

       sc->sc_dev_ok = ATPPC_NOATTACH;

       if (aa->poll) {
               aprint_error(": polling not supported\n");
               return;
       }

       printf(": AT Parallel Port\n");

       /* Attach */
       sc->sc_dev = self;
       sc->sc_iot = aa->t;
       sc->sc_ioh = aa->h;
       sc->sc_dmat = aa->dmat;
       sc->sc_has = 0;

       intrstr = pci_intr_string(aa->pc, aa->intrhandle, intrbuf,
           sizeof(intrbuf));
       sc->sc_ieh = pci_intr_establish_xname(aa->pc, aa->intrhandle, IPL_TTY,
           atppcintr, sc, device_xname(self));
       if (sc->sc_ieh == NULL) {
               aprint_error_dev(sc->sc_dev, "couldn't establish interrupt");
               if (intrstr != NULL)
                       aprint_error(" at %s", intrstr);
               aprint_error("\n");
               return;
       }
       aprint_normal_dev(sc->sc_dev, "interrupting at %s\n", intrstr);
       sc->sc_has |= ATPPC_HAS_INTR;

       /* setup DMA hooks */
       if (atppc_puc_dma_setup(psc) == 0) {
               sc->sc_has |= ATPPC_HAS_DMA;
               sc->sc_dma_start = atppc_puc_dma_start;
               sc->sc_dma_finish = atppc_puc_dma_finish;
               sc->sc_dma_abort = atppc_puc_dma_abort;
               sc->sc_dma_malloc = atppc_puc_dma_malloc;
               sc->sc_dma_free = atppc_puc_dma_free;
       }

       /* Finished attach */
       sc->sc_dev_ok = ATPPC_ATTACHED;

       /* Run soft configuration attach */
       atppc_sc_attach(sc);
}

/* Setup DMA structures */
static int
atppc_puc_dma_setup(struct atppc_puc_softc *psc)
{
       return EOPNOTSUPP;      /* XXX DMA not tested yet */
#if 0
       struct atppc_softc *sc = (struct atppc_softc *)psc;
       int error;

#define BUFSIZE PAGE_SIZE       /* XXX see lptvar.h */
       if ((error = bus_dmamap_create(sc->sc_dmat, BUFSIZE, 1, BUFSIZE, 0,
           BUS_DMA_NOWAIT, &psc->sc_dmamap)))
               return error;

       return (0);
#endif
}

/* Start DMA operation over PCI bus */
static int
atppc_puc_dma_start(struct atppc_softc *sc, void *buf, u_int nbytes,
       u_int8_t mode)
{
       struct atppc_puc_softc *psc = (struct atppc_puc_softc *)sc;

       bus_dmamap_sync(sc->sc_dmat, psc->sc_dmamap, 0, nbytes,
           (mode == ATPPC_DMA_MODE_WRITE) ? BUS_DMASYNC_PREWRITE
                       : BUS_DMASYNC_PREREAD);

       return (0);
}

/* Stop DMA operation over PCI bus */
static int
atppc_puc_dma_finish(struct atppc_softc *sc)
{

       struct atppc_puc_softc *psc = (struct atppc_puc_softc *)sc;

       /*
        * We don't know direction of DMA, so sync both. We can safely
        *  assume the dma map is loaded.
        */
       bus_dmamap_sync(sc->sc_dmat, psc->sc_dmamap, 0,
           psc->sc_dmamap->dm_segs[0].ds_len,
           BUS_DMASYNC_POSTWRITE|BUS_DMASYNC_POSTREAD);

       return (0);
}

/* Abort DMA operation over PCI bus */
int
atppc_puc_dma_abort(struct atppc_softc * lsc)
{

       /* Nothing to do - we do not need to sync, op is aborted */
       return (0);
}

/* Allocate memory for DMA over PCI bus */
int
atppc_puc_dma_malloc(device_t dev, void **buf, bus_addr_t *bus_addr,
       bus_size_t size)
{
       struct atppc_puc_softc *psc = device_private(dev);
       struct atppc_softc *sc = &psc->sc_atppc;
       int error;

       error = bus_dmamap_load(sc->sc_dmat, psc->sc_dmamap, *buf, size,
           NULL /* kernel address */, BUS_DMA_WAITOK|BUS_DMA_STREAMING);
       if (error)
               return (error);

       *bus_addr = psc->sc_dmamap->dm_segs[0].ds_addr;
       return (0);
}

/* Free memory allocated by atppc_isa_dma_malloc() */
void
atppc_puc_dma_free(device_t dev, void **buf, bus_addr_t *bus_addr,
       bus_size_t size)
{
       struct atppc_puc_softc *psc = device_private(dev);
       struct atppc_softc *sc = &psc->sc_atppc;

       return (bus_dmamap_unload(sc->sc_dmat, psc->sc_dmamap));
}

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