/*      $NetBSD: if_le_obio.c,v 1.29 2022/05/29 10:45:05 rin Exp $      */

/*-
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum; Jason R. Thorpe of the Numerical Aerospace
* Simulation Facility, NASA Ames Research Center; Paul Kranenburg.
*
* 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_le_obio.c,v 1.29 2022/05/29 10:45:05 rin Exp $");

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

#include <uvm/uvm_extern.h>

#include <net/if.h>
#include <net/if_ether.h>
#include <net/if_media.h>

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

#include <dev/ic/lancereg.h>
#include <dev/ic/lancevar.h>
#include <dev/ic/am7990reg.h>
#include <dev/ic/am7990var.h>

/*
* LANCE registers.
*/
#define LEREG1_RDP      0       /* Register Data port */
#define LEREG1_RAP      2       /* Register Address port */

struct  le_softc {
       struct  am7990_softc    sc_am7990;      /* glue to MI code */
       bus_space_tag_t         sc_bustag;
       bus_dma_tag_t           sc_dmatag;
       bus_dmamap_t            sc_dmamap;
       bus_space_handle_t      sc_reg;         /* LANCE registers */
};

#define MEMSIZE 0x4000          /* LANCE memory size */

/*
* Media types supported.
*/
static int lemedia[] = {
       IFM_ETHER | IFM_10_T,
};
#define NLEMEDIA        __arraycount(lemedia)

static int      lematch_obio(device_t, cfdata_t, void *);
static void     leattach_obio(device_t, device_t, void *);

CFATTACH_DECL_NEW(le_obio, sizeof(struct le_softc),
   lematch_obio, leattach_obio, NULL, NULL);


static void lewrcsr(struct lance_softc *, uint16_t, uint16_t);
static uint16_t lerdcsr(struct lance_softc *, uint16_t);

static void
lewrcsr(struct lance_softc *sc, uint16_t port, uint16_t val)
{
       struct le_softc *lesc = (struct le_softc *)sc;
       bus_space_tag_t t = lesc->sc_bustag;
       bus_space_handle_t h = lesc->sc_reg;

       bus_space_write_2(t, h, LEREG1_RAP, port);
       bus_space_write_2(t, h, LEREG1_RDP, val);
}

static uint16_t
lerdcsr(struct lance_softc *sc, uint16_t port)
{
       struct le_softc *lesc = (struct le_softc *)sc;
       bus_space_tag_t t = lesc->sc_bustag;
       bus_space_handle_t h = lesc->sc_reg;

       bus_space_write_2(t, h, LEREG1_RAP, port);
       return bus_space_read_2(t, h, LEREG1_RDP);
}

static int
lematch_obio(device_t parent, cfdata_t cf, void *aux)
{
       union obio_attach_args *uoba = aux;
       struct obio4_attach_args *oba;

       if (uoba->uoba_isobio4 == 0)
               return 0;

       oba = &uoba->uoba_oba4;
       return bus_space_probe(oba->oba_bustag, oba->oba_paddr,
                               2,      /* probe size */
                               0,      /* offset */
                               0,      /* flags */
                               NULL, NULL);
}

static void
leattach_obio(device_t parent, device_t self, void *aux)
{
       union obio_attach_args *uoba = aux;
       struct obio4_attach_args *oba = &uoba->uoba_oba4;
       struct le_softc *lesc = device_private(self);
       struct lance_softc *sc = &lesc->sc_am7990.lsc;
       bus_dma_segment_t seg;
       bus_dma_tag_t dmatag;
       int rseg;
       int error;

       sc->sc_dev = self;
       lesc->sc_bustag = oba->oba_bustag;
       lesc->sc_dmatag = dmatag = oba->oba_dmatag;

       if (bus_space_map(oba->oba_bustag, oba->oba_paddr,
           2 * sizeof(uint16_t), 0, &lesc->sc_reg) != 0) {
               aprint_error(": cannot map registers\n");
               return;
       }

       /* Get a DMA handle */
       if ((error = bus_dmamap_create(dmatag, MEMSIZE, 1, MEMSIZE, 0,
           BUS_DMA_NOWAIT|BUS_DMA_24BIT, &lesc->sc_dmamap)) != 0) {
               aprint_error(": DMA map create error %d\n", error);
               goto bad_bsunmap;
       }

       /* Allocate DMA buffer */
       if ((error = bus_dmamem_alloc(dmatag, MEMSIZE, PAGE_SIZE, 0,
           &seg, 1, &rseg, BUS_DMA_NOWAIT | BUS_DMA_24BIT)) != 0) {
               aprint_error(": DMA memory allocation error %d\n", error);
               goto bad_destroy;
       }
       /* Map DMA buffer into kernel space */
       if ((error = bus_dmamem_map(dmatag, &seg, rseg, MEMSIZE,
           (void **)&sc->sc_mem, BUS_DMA_NOWAIT|BUS_DMA_COHERENT)) != 0) {
               aprint_error(": DMA memory map error %d\n", error);
               goto bad_free;
       }
       /* Load DMA buffer */
       if ((error = bus_dmamap_load(dmatag, lesc->sc_dmamap,
           sc->sc_mem, MEMSIZE, NULL, BUS_DMA_NOWAIT)) != 0) {
               aprint_error(": DMA buffer map load error %d\n", error);
               goto bad_unmap;
       }

       sc->sc_addr = lesc->sc_dmamap->dm_segs[0].ds_addr & 0xffffff;
       sc->sc_memsize = MEMSIZE;
       sc->sc_conf3 = LE_C3_BSWP | LE_C3_ACON | LE_C3_BCON;

       sc->sc_supmedia = lemedia;
       sc->sc_nsupmedia = NLEMEDIA;
       sc->sc_defaultmedia = lemedia[0];

       prom_getether(0, sc->sc_enaddr);

       sc->sc_copytodesc = lance_copytobuf_contig;
       sc->sc_copyfromdesc = lance_copyfrombuf_contig;
       sc->sc_copytobuf = lance_copytobuf_contig;
       sc->sc_copyfrombuf = lance_copyfrombuf_contig;
       sc->sc_zerobuf = lance_zerobuf_contig;

       sc->sc_rdcsr = lerdcsr;
       sc->sc_wrcsr = lewrcsr;

       am7990_config(&lesc->sc_am7990);

       /* Install interrupt */
       (void)bus_intr_establish(lesc->sc_bustag, oba->oba_pri, IPL_NET,
           am7990_intr, sc);

       return;

bad_unmap:
       bus_dmamem_unmap(dmatag, (void *)sc->sc_mem, MEMSIZE);
bad_free:
       bus_dmamem_free(lesc->sc_dmatag, &seg, rseg);
bad_destroy:
       bus_dmamap_destroy(dmatag, lesc->sc_dmamap);
bad_bsunmap:
       bus_space_unmap(oba->oba_bustag, lesc->sc_reg, 2 * sizeof(uint16_t));
}

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