/*      $NetBSD: if_le.c,v 1.15 2025/04/26 04:07:05 tsutsui Exp $       */

/*-
 * Copyright (c) 1996, 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Adam Glass, Gordon W. Ross and Wayne Knowles
 *
 * 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.c,v 1.15 2025/04/26 04:07:05 tsutsui Exp $");

#include "opt_inet.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/syslog.h>
#include <sys/socket.h>
#include <sys/device.h>

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

#ifdef INET
#include <netinet/in.h>
#include <netinet/if_inarp.h>
#endif

#include <machine/cpu.h>
#include <machine/mainboard.h>
#include <machine/autoconf.h>
#include <machine/bus.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      2       /* Offset to LANCE data register */
#define LEREG1_RAP      6       /* Offset to LANCE address register */

/*
 * Ethernet software status per interface.
 * The real stuff is in dev/ic/am7990var.h
 */
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_space_handle_t      sc_reg;         /* LANCE registers */
        bus_dmamap_t            sc_dmamap;
        struct evcnt            sc_intrcnt;     /* Interrupt event counter */
};

static int      le_match(device_t, cfdata_t, void *);
static void     le_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(le, sizeof(struct le_softc),
    le_match, le_attach, NULL, NULL);

#if defined(_KERNEL_OPT)
#include "opt_ddb.h"
#endif

#ifdef DDB
#define integrate
#define hide
#else
#define integrate       static inline
#define hide            static
#endif

int le_intr(void *);

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

hide void
lewrcsr(struct lance_softc *sc, uint16_t port, uint16_t val)
{
        struct le_softc *lesc = (struct le_softc *)sc;

        bus_space_write_2(lesc->sc_bustag, lesc->sc_reg, LEREG1_RAP, port);
        bus_space_write_2(lesc->sc_bustag, lesc->sc_reg, LEREG1_RDP, val);
}

hide uint16_t
lerdcsr(struct lance_softc *sc, uint16_t port)
{
        struct le_softc *lesc = (struct le_softc *)sc;

        bus_space_write_2(lesc->sc_bustag, lesc->sc_reg, LEREG1_RAP, port);
        return (bus_space_read_2(lesc->sc_bustag, lesc->sc_reg, LEREG1_RDP));
} 

int
le_match(device_t parent, cfdata_t cf, void *aux)
{
        struct confargs *ca = aux;

        if (strcmp(ca->ca_name, "le"))
                return 0;

        if (badaddr((void *)ca->ca_addr, 1))
                return 0;

        return 1;
}

#define LE_MEMSIZE      (32*1024)

void
le_attach(device_t parent, device_t self, void *aux)
{
        struct le_softc *lesc = device_private(self);
        struct lance_softc *sc = &lesc->sc_am7990.lsc;
        struct confargs *ca = aux;

        bus_dma_tag_t dmat;
        bus_dma_segment_t seg;
        int nseg;
        uint8_t *id;
        int i;
        void *kvaddr;

        sc->sc_dev = self;
        id = (uint8_t *)ETHER_ID;
        lesc->sc_bustag = ca->ca_bustag;
        dmat = lesc->sc_dmatag = ca->ca_dmatag;

        if (bus_space_map(ca->ca_bustag, ca->ca_addr,
                          8,    /* size */
                          BUS_SPACE_MAP_LINEAR,
                          &lesc->sc_reg) != 0) {
                aprint_error(": cannot map registers\n");
                return;
        }

        /*
         * Allocate a physically contiguous DMA area for the chip.
         */
        if (bus_dmamem_alloc(dmat, LE_MEMSIZE, 0, 0, &seg, 1,
                             &nseg, BUS_DMA_NOWAIT)) {
                aprint_error(": can't allocate DMA area\n");
                goto bad_bsunmap;
        }
        /* Map pages into kernel memory */
        if (bus_dmamem_map(dmat, &seg, nseg, LE_MEMSIZE,
            &kvaddr, BUS_DMA_NOWAIT|BUS_DMA_COHERENT)) {
                aprint_error(": can't map DMA area\n");
                goto bad_free;
        }
        /* Build DMA map so we can get physical address */
        if (bus_dmamap_create(dmat, LE_MEMSIZE, 1, LE_MEMSIZE,
                              0, BUS_DMA_NOWAIT, &lesc->sc_dmamap)) {
                aprint_error(": can't create DMA map\n");
                goto bad_unmap;
        }
        if (bus_dmamap_load(dmat, lesc->sc_dmamap, kvaddr, LE_MEMSIZE,
                            NULL, BUS_DMA_NOWAIT)) {
                aprint_error(": can't load DMA map\n");
                goto bad_destroy;
        }

        sc->sc_memsize = LE_MEMSIZE;    /* 32K Buffer space*/
        sc->sc_mem  = (void *)MIPS_PHYS_TO_KSEG1(kvaddr);
        sc->sc_addr = lesc->sc_dmamap->dm_segs[0].ds_addr;

        sc->sc_conf3 = LE_C3_BSWP;

        /* Copy Ethernet hardware address from NVRAM */
        for (i = 0; i < ETHER_ADDR_LEN; i++)
                sc->sc_enaddr[i] = id[i * 4 + 3];       /* XXX */

        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;
        sc->sc_hwinit = NULL;

        evcnt_attach_dynamic(&lesc->sc_intrcnt, EVCNT_TYPE_INTR, NULL,
                             device_xname(self), "intr");
        bus_intr_establish(lesc->sc_bustag, SYS_INTR_ETHER, 0, 0,
                           le_intr, lesc);

        am7990_config(&lesc->sc_am7990);
        return;

 bad_destroy:
        bus_dmamap_destroy(dmat, lesc->sc_dmamap);
 bad_unmap:
        bus_dmamem_unmap(dmat, kvaddr, LE_MEMSIZE);
 bad_free:
        bus_dmamem_free(dmat, &seg, nseg);
 bad_bsunmap:
        bus_space_unmap(ca->ca_bustag, lesc->sc_reg, 8);
}

int
le_intr(void *arg)
{
        struct le_softc *lesc = arg;

        lesc->sc_intrcnt.ev_count++;
        return am7990_intr(&lesc->sc_am7990);
}