/*      $NetBSD: if_le_ledma.c,v 1.39 2025/10/15 01:36:25 thorpej 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_ledma.c,v 1.39 2025/10/15 01:36:25 thorpej 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 <sys/bus.h>
#include <sys/intr.h>
#include <machine/autoconf.h>

#include <dev/sbus/sbusvar.h>

#include <dev/ic/lsi64854reg.h>
#include <dev/ic/lsi64854var.h>

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

#include "ioconf.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_dmamap_t            sc_dmamap;
        bus_space_handle_t      sc_reg;         /* LANCE registers */
        struct  lsi64854_softc  *sc_dma;        /* pointer to my dma */
        u_int                   sc_laddr;       /* LANCE DMA address */
        u_int                   sc_lostcount;
#define LE_LOSTTHRESH   5       /* lost carrior count to switch media */
};

#define MEMSIZE         (16*1024)       /* LANCE memory size */
#define LEDMA_BOUNDARY  (16*1024*1024)  /* must not cross 16MB boundary */

int     lematch_ledma(device_t, cfdata_t, void *);
void    leattach_ledma(device_t, device_t, void *);

/*
 * Media types supported by the Sun4m.
 */
static int lemedia[] = {
        IFM_ETHER | IFM_10_T,
        IFM_ETHER | IFM_10_5,
        IFM_ETHER | IFM_AUTO,
};
#define NLEMEDIA        __arraycount(lemedia)

void    lesetutp(struct lance_softc *);
void    lesetaui(struct lance_softc *);

int     lemediachange(struct lance_softc *);
void    lemediastatus(struct lance_softc *, struct ifmediareq *);

CFATTACH_DECL_NEW(le_ledma, sizeof(struct le_softc),
    lematch_ledma, leattach_ledma, NULL, NULL);

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

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

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);

#if defined(SUN4M)
        /*
         * We need to flush the Sbus->Mbus write buffers. This can most
         * easily be accomplished by reading back the register that we
         * just wrote (thanks to Chris Torek for this solution).
         */
        (void)bus_space_read_2(t, h, LEREG1_RDP);
#endif
}

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);
}

void
lesetutp(struct lance_softc *sc)
{
        struct lsi64854_softc *dma = ((struct le_softc *)sc)->sc_dma;
        uint32_t csr;

        csr = L64854_GCSR(dma);
        csr |= E_TP_AUI;
        L64854_SCSR(dma, csr);
        delay(20000);   /* must not touch le for 20ms */
}

void
lesetaui(struct lance_softc *sc)
{
        struct lsi64854_softc *dma = ((struct le_softc *)sc)->sc_dma;
        uint32_t csr;

        csr = L64854_GCSR(dma);
        csr &= ~E_TP_AUI;
        L64854_SCSR(dma, csr);
        delay(20000);   /* must not touch le for 20ms */
}

int
lemediachange(struct lance_softc *sc)
{
        struct ifmedia *ifm = &sc->sc_media;

        if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
                return EINVAL;

        /*
         * Switch to the selected media.  If autoselect is
         * set, we don't really have to do anything.  We'll
         * switch to the other media when we detect loss of
         * carrier.
         */
        switch (IFM_SUBTYPE(ifm->ifm_media)) {
        case IFM_10_T:
                lesetutp(sc);
                break;

        case IFM_10_5:
                lesetaui(sc);
                break;

        case IFM_AUTO:
                break;

        default:
                return EINVAL;
        }

        return 0;
}

void
lemediastatus(struct lance_softc *sc, struct ifmediareq *ifmr)
{
        struct lsi64854_softc *dma = ((struct le_softc *)sc)->sc_dma;

        /*
         * Notify the world which media we're currently using.
         */
        if (L64854_GCSR(dma) & E_TP_AUI)
                ifmr->ifm_active = IFM_ETHER | IFM_10_T;
        else
                ifmr->ifm_active = IFM_ETHER | IFM_10_5;
}

static void
lehwreset(struct lance_softc *sc)
{
        struct le_softc *lesc = (struct le_softc *)sc;
        struct lsi64854_softc *dma = lesc->sc_dma;
        uint32_t csr;
        u_int aui_bit;

        /*
         * Reset DMA channel.
         */
        csr = L64854_GCSR(dma);
        aui_bit = csr & E_TP_AUI;
        DMA_RESET(dma);

        /* Write bits 24-31 of Lance address */
        bus_space_write_4(dma->sc_bustag, dma->sc_regs, L64854_REG_ENBAR,
                          lesc->sc_laddr & 0xff000000);

        DMA_ENINTR(dma);

        /*
         * Disable E-cache invalidates on chip writes.
         * Retain previous cable selection bit.
         */
        csr = L64854_GCSR(dma);
        csr |= (E_DSBL_WR_INVAL | aui_bit);
        L64854_SCSR(dma, csr);
        delay(20000);   /* must not touch le for 20ms */
}

static void
lehwinit(struct lance_softc *sc)
{

        /*
         * Make sure we're using the currently-enabled media type.
         * XXX Actually, this is probably unnecessary, now.
         */
        switch (IFM_SUBTYPE(sc->sc_media.ifm_cur->ifm_media)) {
        case IFM_10_T:
                lesetutp(sc);
                break;

        case IFM_10_5:
                lesetaui(sc);
                break;
        }
}

static void
lenocarrier(struct lance_softc *sc)
{
        struct le_softc *lesc = (struct le_softc *)sc;

        /* it may take a while for modern switches to set 10baseT media */
        if (lesc->sc_lostcount++ < LE_LOSTTHRESH)
                return;

        lesc->sc_lostcount = 0;

        /*
         * Check if the user has requested a certain cable type, and
         * if so, honor that request.
         */
        printf("%s: lost carrier on ", device_xname(sc->sc_dev));

        if (L64854_GCSR(lesc->sc_dma) & E_TP_AUI) {
                printf("UTP port");
                switch (IFM_SUBTYPE(sc->sc_media.ifm_media)) {
                case IFM_10_5:
                case IFM_AUTO:
                        printf(", switching to AUI port");
                        lesetaui(sc);
                }
        } else {
                printf("AUI port");
                switch (IFM_SUBTYPE(sc->sc_media.ifm_media)) {
                case IFM_10_T:
                case IFM_AUTO:
                        printf(", switching to UTP port");
                        lesetutp(sc);
                }
        }
        printf("\n");
}

int
lematch_ledma(device_t parent, cfdata_t cf, void *aux)
{
        struct sbus_attach_args *sa = aux;

        return (strcmp(cf->cf_name, sa->sa_name) == 0);
}


void
leattach_ledma(device_t parent, device_t self, void *aux)
{
        struct le_softc *lesc = device_private(self);
        struct lance_softc *sc = &lesc->sc_am7990.lsc;
        struct lsi64854_softc *lsi = device_private(parent);
        struct sbus_attach_args *sa = aux;
        bus_dma_tag_t dmatag = sa->sa_dmatag;
        bus_dma_segment_t seg;
        int rseg, error;

        sc->sc_dev = self;
        lesc->sc_bustag = sa->sa_bustag;

        /* Establish link to `ledma' device */
        lesc->sc_dma = lsi;
        lesc->sc_dma->sc_client = lesc;

        /* Map device registers */
        if (sbus_bus_map(sa->sa_bustag,
                         sa->sa_slot,
                         sa->sa_offset,
                         sa->sa_size,
                         0, &lesc->sc_reg) != 0) {
                aprint_error(": cannot map registers\n");
                return;
        }

        /* Allocate buffer memory */
        sc->sc_memsize = MEMSIZE;

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

        /* Allocate DMA buffer */
        if ((error = bus_dmamem_alloc(dmatag, MEMSIZE, 0, LEDMA_BOUNDARY,
            &seg, 1, &rseg, BUS_DMA_NOWAIT)) != 0) {
                aprint_error(": DMA buffer alloc 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 buffer 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 | BUS_DMA_COHERENT)) != 0) {
                aprint_error(": DMA buffer map load error %d\n", error);
                goto bad_unmap;
        }

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

        sc->sc_mediachange = lemediachange;
        sc->sc_mediastatus = lemediastatus;
        sc->sc_supmedia = lemedia;
        sc->sc_nsupmedia = NLEMEDIA;
        sc->sc_defaultmedia = IFM_ETHER | IFM_AUTO;

        if (! ether_getaddr(self, sc->sc_enaddr)) {
                aprint_error(": unable to get MAC address\n");
                goto bad_unmap;
        }

        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 = lehwinit;
        sc->sc_nocarrier = lenocarrier;
        sc->sc_hwreset = lehwreset;

        /* Establish interrupt handler */
        if (sa->sa_nintr != 0)
                (void)bus_intr_establish(sa->sa_bustag, sa->sa_pri, IPL_NET,
                                         am7990_intr, sc);

        am7990_config(&lesc->sc_am7990);

        /* now initialize DMA */
        lehwreset(sc);

        return;

 bad_unmap:
        bus_dmamem_unmap(dmatag, sc->sc_mem, MEMSIZE);
 bad_free:
        bus_dmamem_free(dmatag, &seg, rseg);
 bad_destroy:
        bus_dmamap_destroy(dmatag, lesc->sc_dmamap);
}