/*      $NetBSD: fdc_jazzio.c,v 1.15 2011/07/01 19:25:41 dyoung Exp $   */
/*      $OpenBSD: fd.c,v 1.6 1998/10/03 21:18:57 millert Exp $  */
/*      NetBSD: fd.c,v 1.78 1995/07/04 07:23:09 mycroft Exp     */

/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* 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) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Don Ahn.
*
* 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.
*
*      @(#)fd.c        7.4 (Berkeley) 5/25/91
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: fdc_jazzio.c,v 1.15 2011/07/01 19:25:41 dyoung Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/device.h>

#include <machine/autoconf.h>
#include <sys/bus.h>

#include <arc/jazz/jazzdmatlbreg.h>
#include <arc/jazz/fdreg.h>
#include <arc/jazz/fdcvar.h>
#include <arc/jazz/jazziovar.h>
#include <arc/jazz/dma.h>

/* controller driver configuration */
static int fdc_jazzio_probe(device_t, cfdata_t, void *);
static void fdc_jazzio_attach(device_t, device_t, void *);

/* MD DMA hook functions */
static void fdc_jazzio_dma_start(struct fdc_softc *, void *, size_t, int);
static void fdc_jazzio_dma_abort(struct fdc_softc *);
static void fdc_jazzio_dma_done(struct fdc_softc *);

/* software state, per controller */
struct fdc_jazzio_softc {
       struct fdc_softc sc_fdc;        /* base fdc device */

       bus_space_handle_t sc_baseioh;  /* base I/O handle */
       bus_space_handle_t sc_dmaioh;   /* DMA I/O handle */

       bus_dma_tag_t sc_dmat;          /* bus_dma tag */
       bus_dmamap_t sc_dmamap;         /* bus_dma map */
       int sc_datain;                  /* data direction */
};

CFATTACH_DECL_NEW(fdc_jazzio, sizeof(struct fdc_jazzio_softc),
   fdc_jazzio_probe, fdc_jazzio_attach, NULL, NULL);

#define FDC_NPORT 6
#define FDC_OFFSET 2 /* Should we use bus_space_subregion() or not? */

static int
fdc_jazzio_probe(device_t parent, cfdata_t cf, void *aux)
{
       struct jazzio_attach_args *ja = aux;
       bus_space_tag_t iot;
       bus_space_handle_t base_ioh, ioh;
       int rv;

       if (strcmp(ja->ja_name, "I82077") != 0)
               return 0;

       iot = ja->ja_bust;
       rv = 0;

       /* Map the I/O space. */
       if (bus_space_map(iot, ja->ja_addr,
           FDC_OFFSET + FDC_NPORT, 0, &base_ioh))
               return 0;

       if (bus_space_subregion(iot, base_ioh, FDC_OFFSET, FDC_NPORT, &ioh))
               goto out;

       /* reset */
       bus_space_write_1(iot, ioh, FDOUT, 0);
       delay(100);
       bus_space_write_1(iot, ioh, FDOUT, FDO_FRST);

       /* see if it can handle a command */
       if (out_fdc(iot, ioh, NE7CMD_SPECIFY) < 0)
               goto out;
       out_fdc(iot, ioh, 0xdf); /* XXX */
       out_fdc(iot, ioh, 2); /* XXX */

       rv = 1;

out:
       bus_space_unmap(iot, base_ioh, FDC_OFFSET + FDC_NPORT);
       return rv;
}

static void
fdc_jazzio_attach(device_t parent, device_t self, void *aux)
{
       struct fdc_jazzio_softc *jsc = device_private(self);
       struct fdc_softc *fdc = &jsc->sc_fdc;
       struct jazzio_attach_args *ja = aux;

       fdc->sc_dev = self;
       fdc->sc_iot = ja->ja_bust;

       fdc->sc_maxiosize = MAXPHYS;
       fdc->sc_dma_start = fdc_jazzio_dma_start;
       fdc->sc_dma_abort = fdc_jazzio_dma_abort;
       fdc->sc_dma_done = fdc_jazzio_dma_done;

       jsc->sc_dmat = ja->ja_dmat;

       if (bus_space_map(fdc->sc_iot, ja->ja_addr,
           FDC_OFFSET + FDC_NPORT, 0, &jsc->sc_baseioh)) {
               aprint_error(": unable to map I/O space\n");
               return;
       }

       if (bus_space_subregion(fdc->sc_iot, jsc->sc_baseioh,
           FDC_OFFSET, FDC_NPORT, &fdc->sc_ioh)) {
               aprint_error(": unable to subregion I/O space\n");
               goto out_unmap1;
       }

       if (bus_space_map(fdc->sc_iot, jazzio_conf->jc_fdcdmareg,
           R4030_DMA_RANGE, 0, &jsc->sc_dmaioh)) {
               aprint_error(": unable to map DMA I/O space\n");
               goto out_unmap1;
       }

       if (bus_dmamap_create(jsc->sc_dmat, MAXPHYS, 1, MAXPHYS, 0,
           BUS_DMA_ALLOCNOW|BUS_DMA_NOWAIT, &jsc->sc_dmamap)) {
               aprint_error(": unable to create DMA map\n");
               goto out_unmap2;
       }

       aprint_normal("\n");

       jazzio_intr_establish(ja->ja_intr, fdcintr, fdc);

       fdcattach(fdc);
       return;

out_unmap2:
       bus_space_unmap(fdc->sc_iot, jsc->sc_dmaioh, R4030_DMA_RANGE);
out_unmap1:
       bus_space_unmap(fdc->sc_iot, jsc->sc_baseioh, FDC_OFFSET + FDC_NPORT);
}

static void
fdc_jazzio_dma_start(struct fdc_softc *fdc, void *addr, size_t size,
   int datain)
{
       struct fdc_jazzio_softc *jsc = (struct fdc_jazzio_softc *)fdc;

       /* halt DMA */
       bus_space_write_4(fdc->sc_iot, jsc->sc_dmaioh, R4030_DMA_ENAB, 0);
       bus_space_write_4(fdc->sc_iot, jsc->sc_dmaioh, R4030_DMA_MODE, 0);

       jsc->sc_datain = datain;

       bus_dmamap_load(jsc->sc_dmat, jsc->sc_dmamap, addr, size, NULL,
           BUS_DMA_NOWAIT | BUS_DMA_STREAMING |
           (datain ? BUS_DMA_READ : BUS_DMA_WRITE));
       bus_dmamap_sync(jsc->sc_dmat, jsc->sc_dmamap,
           0, jsc->sc_dmamap->dm_mapsize,
           datain ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);

       /* load new transfer parameters */
       bus_space_write_4(fdc->sc_iot, jsc->sc_dmaioh,
           R4030_DMA_ADDR, jsc->sc_dmamap->dm_segs[0].ds_addr);
       bus_space_write_4(fdc->sc_iot, jsc->sc_dmaioh,
           R4030_DMA_COUNT, jsc->sc_dmamap->dm_segs[0].ds_len);
       bus_space_write_4(fdc->sc_iot, jsc->sc_dmaioh,
           R4030_DMA_MODE, R4030_DMA_MODE_160NS | R4030_DMA_MODE_8);

       /* start DMA */
       bus_space_write_4(fdc->sc_iot, jsc->sc_dmaioh,
           R4030_DMA_ENAB, R4030_DMA_ENAB_RUN |
           (datain ? R4030_DMA_ENAB_READ : R4030_DMA_ENAB_WRITE));
}

static void
fdc_jazzio_dma_abort(struct fdc_softc *fdc)
{
       struct fdc_jazzio_softc *jsc = (struct fdc_jazzio_softc *)fdc;

       /* halt DMA */
       bus_space_write_4(fdc->sc_iot, jsc->sc_dmaioh, R4030_DMA_ENAB, 0);
       bus_space_write_4(fdc->sc_iot, jsc->sc_dmaioh, R4030_DMA_MODE, 0);
}

static void
fdc_jazzio_dma_done(struct fdc_softc *fdc)
{
       struct fdc_jazzio_softc *jsc = (struct fdc_jazzio_softc *)fdc;

       /* halt DMA */
       bus_space_write_4(fdc->sc_iot, jsc->sc_dmaioh, R4030_DMA_COUNT, 0);
       bus_space_write_4(fdc->sc_iot, jsc->sc_dmaioh, R4030_DMA_ENAB, 0);
       bus_space_write_4(fdc->sc_iot, jsc->sc_dmaioh, R4030_DMA_MODE, 0);

       bus_dmamap_sync(jsc->sc_dmat, jsc->sc_dmamap,
           0, jsc->sc_dmamap->dm_mapsize,
           jsc->sc_datain ? BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
       bus_dmamap_unload(jsc->sc_dmat, jsc->sc_dmamap);
}

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