/*      $NetBSD: if_le_ledma.c,v 1.38 2022/09/25 18:03:04 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 1.38 2022/09/25 18:03:04 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;

       prom_getether(sa->sa_node, 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;
       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);
}

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