/*      $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));
}