/*      $NetBSD: depca.c,v 1.19 2021/08/07 16:19:12 thorpej Exp $       */

/*-
 * Copyright (c) 1997, 1998, 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Charles M. Hannum and by Jason R. Thorpe of the Numerical Aerospace
 * Simulation Facility, NASA Ames Research Center.
 *
 * 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.
 */

/*-
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell and Rick Macklem.
 *
 * 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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *      @(#)if_le.c     8.2 (Berkeley) 11/16/93
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: depca.c,v 1.19 2021/08/07 16:19:12 thorpej Exp $");

#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/cpu.h>
#include <sys/intr.h>
#include <sys/bus.h>

#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>

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

struct le_depca_softc {
        struct am7990_softc sc_am7990;  /* glue to MI code */

        void *sc_ih;
};

int     le_depca_match(device_t, cfdata_t, void *);
void    le_depca_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(le_depca, sizeof(struct le_depca_softc),
    le_depca_match, le_depca_attach, NULL, NULL);

void    depca_copytobuf(struct lance_softc *, void *, int, int);
void    depca_copyfrombuf(struct lance_softc *, void *, int, int);
void    depca_zerobuf(struct lance_softc *, int, int);

struct depca_attach_args {
        const char *da_name;
};

int     depca_print(void *, const char *);

void
depca_attach(struct depca_softc *sc)
{
        struct depca_attach_args da;

        da.da_name = "le";

        (void)config_found(sc->sc_dev, &da, depca_print, CFARGS_NONE);
}

int
depca_print(void *aux, const char *pnp)
{
        struct depca_attach_args *da = aux;

        if (pnp)
                aprint_normal("%s at %s", da->da_name, pnp);

        return (UNCONF);
}

void
depca_wrcsr(struct lance_softc *sc, uint16_t port, uint16_t val)
{
        struct depca_softc *dsc = device_private(device_parent(sc->sc_dev));

        bus_space_write_2(dsc->sc_iot, dsc->sc_ioh, DEPCA_RAP, port);
        bus_space_write_2(dsc->sc_iot, dsc->sc_ioh, DEPCA_RDP, val);
}

uint16_t
depca_rdcsr(struct lance_softc *sc, uint16_t port)
{
        struct depca_softc *dsc = device_private(device_parent(sc->sc_dev));

        bus_space_write_2(dsc->sc_iot, dsc->sc_ioh, DEPCA_RAP, port);
        return (bus_space_read_2(dsc->sc_iot, dsc->sc_ioh, DEPCA_RDP));
}

int
depca_readprom(bus_space_tag_t iot, bus_space_handle_t ioh, uint8_t *laddr)
{
        int port, i;

        /*
         * Extract the physical MAC address from the ROM.
         *
         * The address PROM is 32 bytes wide, and we access it through
         * a single I/O port.  On each read, it rotates to the next
         * position.  We find the ethernet address by looking for a
         * particular sequence of bytes (0xff, 0x00, 0x55, 0xaa, 0xff,
         * 0x00, 0x55, 0xaa), and then reading the next 8 bytes (the
         * ethernet address and a checksum).
         *
         * It appears that the PROM can be at one of two locations, so
         * we just try both.
         */
        port = DEPCA_ADP;
        for (i = 0; i < 32; i++)
                if (bus_space_read_1(iot, ioh, port) == 0xff &&
                    bus_space_read_1(iot, ioh, port) == 0x00 &&
                    bus_space_read_1(iot, ioh, port) == 0x55 &&
                    bus_space_read_1(iot, ioh, port) == 0xaa &&
                    bus_space_read_1(iot, ioh, port) == 0xff &&
                    bus_space_read_1(iot, ioh, port) == 0x00 &&
                    bus_space_read_1(iot, ioh, port) == 0x55 &&
                    bus_space_read_1(iot, ioh, port) == 0xaa)
                        goto found;
        port = DEPCA_ADP + 1;
        for (i = 0; i < 32; i++)
                if (bus_space_read_1(iot, ioh, port) == 0xff &&
                    bus_space_read_1(iot, ioh, port) == 0x00 &&
                    bus_space_read_1(iot, ioh, port) == 0x55 &&
                    bus_space_read_1(iot, ioh, port) == 0xaa &&
                    bus_space_read_1(iot, ioh, port) == 0xff &&
                    bus_space_read_1(iot, ioh, port) == 0x00 &&
                    bus_space_read_1(iot, ioh, port) == 0x55 &&
                    bus_space_read_1(iot, ioh, port) == 0xaa)
                        goto found;
        aprint_error("depca: address not found\n");
        return (-1);

found:

        if (laddr) {
                for (i = 0; i < 6; i++)
                        laddr[i] = bus_space_read_1(iot, ioh, port);
        }

#if 0
        sum =
            (laddr[0] <<  2) +
            (laddr[1] << 10) +
            (laddr[2] <<  1) +
            (laddr[3] <<  9) +
            (laddr[4] <<  0) +
            (laddr[5] <<  8);
        sum = (sum & 0xffff) + (sum >> 16);
        sum = (sum & 0xffff) + (sum >> 16);

        rom_sum = bus_space_read_1(iot, ioh, port);
        rom_sum |= bus_space_read_1(iot, ioh, port) << 8;

        if (sum != rom_sum) {
                aprint_error("depca: checksum mismatch; "
                    "calculated %04x != read %04x", sum, rom_sum);
                return (-1);
        }
#endif

        return (0);
}

int
le_depca_match(device_t parent, cfdata_t cf, void *aux)
{
        struct depca_attach_args *da = aux;

        return (strcmp(da->da_name, cf->cf_name) == 0);
}

void
le_depca_attach(device_t parent, device_t self, void *aux)
{
        struct depca_softc *dsc = device_private(parent);
        struct le_depca_softc *lesc = device_private(self);
        struct lance_softc *sc = &lesc->sc_am7990.lsc;
        uint8_t val;
        int i;

        sc->sc_dev = self;
        aprint_error("\n");

        /* I/O and memory spaces already mapped. */

        if (depca_readprom(dsc->sc_iot, dsc->sc_ioh, sc->sc_enaddr)) {
                aprint_error_dev(self, "can't read PROM\n");
                return;
        }

        bus_space_write_2(dsc->sc_iot, dsc->sc_ioh, DEPCA_CSR,
            DEPCA_CSR_DUM | DEPCA_CSR_IEN | DEPCA_CSR_SHE |
            (dsc->sc_memsize == 32*1024 ? DEPCA_CSR_LOW32K : 0));

        val = 0xff;
        for (;;) {
                uint8_t cv;

                bus_space_set_region_1(dsc->sc_memt, dsc->sc_memh, 0, val,
                    dsc->sc_memsize);
                for (i = 0; i < dsc->sc_memsize; i++) {
                        cv = bus_space_read_1(dsc->sc_memt, dsc->sc_memh, i);
                        if (cv != val) {
                                aprint_error_dev(self,
                                    "failed to clear memory at %d "
                                    "(0x%02x != 0x%02x)\n",
                                    i, cv, val);
                                return;
                        }
                }
                if (val == 0x00)
                        break;
                val -= 0x55;
        }

        sc->sc_conf3 = LE_C3_ACON;
        sc->sc_mem = 0;                 /* Not used. */
        sc->sc_addr = 0;
        sc->sc_memsize = dsc->sc_memsize;

        sc->sc_copytodesc = depca_copytobuf;
        sc->sc_copyfromdesc = depca_copyfrombuf;
        sc->sc_copytobuf = depca_copytobuf;
        sc->sc_copyfrombuf = depca_copyfrombuf;
        sc->sc_zerobuf = depca_zerobuf;

        sc->sc_rdcsr = depca_rdcsr;
        sc->sc_wrcsr = depca_wrcsr;
        sc->sc_hwinit = NULL;

        aprint_error("%s", device_xname(self));
        am7990_config(&lesc->sc_am7990);

        lesc->sc_ih = (*dsc->sc_intr_establish)(dsc, sc);
}

/*
 * Controller interrupt.
 */
int
depca_intredge(void *arg)
{

        if (am7990_intr(arg) == 0)
                return (0);
        for (;;)
                if (am7990_intr(arg) == 0)
                        return (1);
}

/*
 * DEPCA shared memory access functions.
 */

void
depca_copytobuf(struct lance_softc *sc, void *from, int boff, int len)
{
        struct depca_softc *dsc = device_private(device_parent(sc->sc_dev));

        bus_space_write_region_1(dsc->sc_memt, dsc->sc_memh, boff,
            from, len);
}

void
depca_copyfrombuf(struct lance_softc *sc, void *to, int boff, int len)
{
        struct depca_softc *dsc = device_private(device_parent(sc->sc_dev));

        bus_space_read_region_1(dsc->sc_memt, dsc->sc_memh, boff,
            to, len);
}

void
depca_zerobuf(struct lance_softc *sc, int boff, int len)
{
        struct depca_softc *dsc = device_private(device_parent(sc->sc_dev));

        bus_space_set_region_1(dsc->sc_memt, dsc->sc_memh, boff,
            0x00, len);
}