/*      $NetBSD: if_le.c,v 1.43 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.c,v 1.43 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>

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

#include <dev/sbus/sbusvar.h>
#include <dev/sbus/lebuffervar.h>       /*XXX*/

#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_dma_tag_t           sc_dmatag;
       bus_dmamap_t            sc_dmamap;
       bus_space_handle_t      sc_reg;
};

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

int     lematch_sbus(device_t, cfdata_t, void *);
void    leattach_sbus(device_t, device_t, void *);

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

CFATTACH_DECL_NEW(le_sbus, sizeof(struct le_softc),
   lematch_sbus, leattach_sbus, 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
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));
}


int
lematch_sbus(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_sbus(device_t parent, device_t self, void *aux)
{
       struct le_softc *lesc = device_private(self);
       struct lance_softc *sc = &lesc->sc_am7990.lsc;
       struct sbus_attach_args *sa = aux;
       bus_dma_tag_t dmatag;
       cfdriver_t lebufcd;

       sc->sc_dev = self;
       lesc->sc_bustag = sa->sa_bustag;
       lesc->sc_dmatag = dmatag = sa->sa_dmatag;

       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;
       }

       /*
        * Look for an "unallocated" lebuffer and pair it with
        * this `le' device on the assumption that we're on
        * a pre-historic ROM that doesn't establish le<=>lebuffer
        * parent-child relationships.
        */
       lebufcd = config_cfdriver_lookup("lebuffer");
       if (lebufcd != NULL) {
               int unit;

               /* Check all possible lebuffer units */
               for (unit = 0; unit < lebufcd->cd_ndevs; unit++) {
                       device_t lebufdev;
                       struct lebuf_softc *lebufsc;

                       /* Check if unit is valid */
                       lebufdev = device_lookup(lebufcd, unit);
                       if (lebufdev == NULL)
                               continue;

                       /* Check if we have a common sbus parent */
                       if (parent != device_parent(lebufdev))
                               continue;
                       lebufsc = device_private(lebufdev);

                       /*
                        * Check if this lebuffer unit is attached
                        * but unused by its child, if_le_lebuffer.
                        * XXX: this won't work if lebuffer is configured
                        *      but not le at lebuffer?
                        */
                       if (lebufsc->sc_buffer == 0 || lebufsc->attached != 0)
                               continue;

                       /* Assume this lebuffer is my pair */
                       sc->sc_mem = lebufsc->sc_buffer;
                       sc->sc_memsize = lebufsc->sc_bufsiz;

                       /* Lance view is offset by buffer location */
                       sc->sc_addr = 0;

                       /* Denote it */
                       aprint_normal(" (%s)", device_xname(lebufdev));
                       lebufsc->attached = 1;

                       /* That old black magic... */
                       sc->sc_conf3 = prom_getpropint(sa->sa_node,
                           "busmaster-regval",
                           LE_C3_BSWP | LE_C3_ACON | LE_C3_BCON);
                       break;
               }
       }

       if (sc->sc_mem == 0) {
               bus_dma_segment_t seg;
               int rseg, error;

#ifndef BUS_DMA_24BIT
/* XXX - This flag is not defined on all archs */
#define BUS_DMA_24BIT   0
#endif
               /* 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);
                       return;
               }

               /* Allocate DMA buffer */
               if ((error = bus_dmamem_alloc(dmatag, MEMSIZE, 0, 0,
                   &seg, 1, &rseg, BUS_DMA_NOWAIT | BUS_DMA_24BIT)) != 0) {
                       aprint_error(": DMA buffer allocation error %d\n",
                           error);
                       bus_dmamap_destroy(dmatag, lesc->sc_dmamap);
                       return;
               }

               /* 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);
                       bus_dmamem_free(lesc->sc_dmatag, &seg, rseg);
                       bus_dmamap_destroy(dmatag, lesc->sc_dmamap);
                       return;
               }

               /* 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);
                       bus_dmamem_unmap(dmatag, sc->sc_mem, MEMSIZE);
                       bus_dmamem_free(lesc->sc_dmatag, &seg, rseg);
                       bus_dmamap_destroy(dmatag, lesc->sc_dmamap);
                       return;
               }

               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;
       }

       prom_getether(sa->sa_node, sc->sc_enaddr);

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

       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);

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

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