/*      $NetBSD: if_le_mca.c,v 1.21 2019/04/09 04:04:04 msaitoh Exp $   */

/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jaromir Dolecek.
*
* 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.
*/

/*
* Driver for SKNET Personal and MC2+ cards, which are AMD Lance 7990 based
* cards made by Syskonnect, former Schneider & Koch Datensysteme GmbH.
*
* Syskonnect was very helpful and provided docs for these cards promptly.
* I wish all vendors would be like that!
* I'd like to thank to Alfred Arnold, author of the Linux driver, for
* giving me contact to The Right Syskonnect person, too :-)
*
* Sources:
* SKNET MC+ Technical Manual, version 1.1, July 21 1993
* SKNET personal Technisches Manual, version 1.2, April 14 1988
* SKNET junior Technisches Manual, version 1.0, July 14 1987
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_le_mca.c,v 1.21 2019/04/09 04:04:04 msaitoh 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/ic/lancereg.h>
#include <dev/ic/lancevar.h>
#include <dev/ic/am7990reg.h>
#include <dev/ic/am7990var.h>

#include <dev/mca/mcareg.h>
#include <dev/mca/mcavar.h>
#include <dev/mca/mcadevs.h>

#include <dev/mca/if_lereg.h>

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

       void    *sc_ih;
       bus_space_tag_t sc_memt;
       bus_space_handle_t sc_memh;
};

static int      le_mca_match(device_t, cfdata_t, void *);
static void     le_mca_attach(device_t, device_t, void *);

static void     le_mca_wrcsr(struct lance_softc *, uint16_t, uint16_t);
static uint16_t le_mca_rdcsr(struct lance_softc *, uint16_t);
static void     le_mca_hwreset(struct lance_softc *);
static int      le_mca_intredge(void *);

static void     le_mca_copytobuf(struct lance_softc *, void *, int, int);
static void     le_mca_copyfrombuf(struct lance_softc *, void *, int, int);
static void     le_mca_zerobuf(struct lance_softc *, int, int);

static inline void le_mca_wrreg(struct le_mca_softc *, int, int);
#define le_mca_set_RAP(sc, reg_number) \
               le_mca_wrreg(sc, reg_number, RAP | REGWRITE)

CFATTACH_DECL_NEW(le_mca, sizeof(struct le_mca_softc),
   le_mca_match, le_mca_attach, NULL, NULL);

/* SKNET MC+ POS mapping */
static const uint8_t sknet_mcp_irq[] = {
       3, 5, 10, 11
};
static const int sknet_mcp_media[] = {
       IFM_ETHER | IFM_10_2,
       IFM_ETHER | IFM_10_T,
       IFM_ETHER | IFM_10_5,
       0
};

int
le_mca_match(device_t parent, cfdata_t cf, void *aux)
{
       struct mca_attach_args *ma = aux;

       switch(ma->ma_id) {
       case MCA_PRODUCT_SKNETPER:
       case MCA_PRODUCT_SKNETG:
               return 1;
       }

       return 0;
}

void
le_mca_attach(device_t parent, device_t self, void *aux)
{
       struct le_mca_softc *lesc = device_private(self);
       struct lance_softc *sc = &lesc->sc_am7990.lsc;
       struct mca_attach_args *ma = aux;
       int i, pos2, pos3, pos4, irq, membase;
       const int *supmedia = NULL;
       const char *typestr;

       sc->sc_dev = self;

       /*
        * SKNET Personal:
        *
        * POS register 2: (adf pos0)
        *
        * 7 6 5 4 3 2 1 0
        *       | \___/ \__ enable: 0=adapter disabled, 1=adapter enabled
        *        \    \____ Memory: 0xC0000-0xC3FFF + XX*0x4000
        *         \________ IRQ: 0=10 1=11
        *
        *
        * SKNET MC+:
        * POS register 2: (adf pos0)
        *
        * 7 6 5 4 3 2 1 0
        *       \___/ \ \__ enable: 0=adapter disabled, 1=adapter enabled
        *           \  \___ BootEPROM disable
        *            \_____ BootEPROM start address: 0xC0000 + XX*0x4000
        *
        * POS register 3: (adf pos1)
        *
        * 7 6 5 4 3 2 1 0
        * 0 0 1 1 \_____/
        *               \__ RAM: 0xC0000 + XX*0x4000
        *
        * POS register 4: (adf pos2)
        *
        * 7 6 5 4 3 2 1 0
        * \_/     \_/ \_/
        *   \       \   \__ Need to be reset to 0 0 after boot
        *    \       \_____ IRQ: 00=3 01=5 10=10 11=11
        *     \____________ Medium: 00=BNC 01=UTP 10=AUI 11=not allowed
        */

       switch (ma->ma_id) {
       case MCA_PRODUCT_SKNETPER:
               typestr = "Personal MC2";

               pos2 = mca_conf_read(ma->ma_mc, ma->ma_slot, 2);
               irq = (pos2 & (1<<4)) ? 11 : 10;
               membase = 0xc0000 + ((pos2 & 0x0e) >> 1) * 0x4000;
               break;
       case MCA_PRODUCT_SKNETG:
               typestr = "MC2+";

               /*
                * SKNET MC+ needs the driver to clear 0, 1 bits of pos4
                * and explicitly set the enable bit. Somebody at Syskonnect
                * was obviously misguided when the card was designed ...
                */
               pos3 = mca_conf_read(ma->ma_mc, ma->ma_slot, 3);
               pos4 = mca_conf_read(ma->ma_mc, ma->ma_slot, 4);
               if ((pos4 & 0x03) != 0) {
                       /* clear the bits 0, 1 */
                       mca_conf_write(ma->ma_mc, ma->ma_slot, 4,
                               pos4 & ~0x03);
               }

               pos2 = mca_conf_read(ma->ma_mc, ma->ma_slot, 2);
               if ((pos2 & 0x01) == 0) {
                       /* enable the card */
                       mca_conf_write(ma->ma_mc, ma->ma_slot, 2, pos2 | 0x01);
               }

               /* get irq and memory base */
               irq = sknet_mcp_irq[(pos4 & 0x0c) >> 2];
               membase = 0xc0000 + ((pos3 & 0x0f) * 0x4000);

               /* Get configured media type */
               supmedia = &sknet_mcp_media[(pos4 & 0xc0) >> 6];
               break;
       default:
               aprint_error(": unknown product %d\n", ma->ma_id);
               return;
       }

       lesc->sc_memt = ma->ma_memt;

       if (bus_space_map(lesc->sc_memt, membase, LE_MCA_MEMSIZE,
               0, &lesc->sc_memh)) {
               aprint_error(": can't map memory\n");
               return;
       }

       aprint_normal(" slot %d irq %d: SKNET %s Ethernet\n",
               ma->ma_slot + 1, irq, typestr);

       /*
        * Extract the physical MAC address from the ROM.
        */
       for (i = 0; i < ETHER_ADDR_LEN; i++)
               sc->sc_enaddr[i] = bus_space_read_1(lesc->sc_memt,
                               lesc->sc_memh, LE_PROMOFF + i * 2);

       sc->sc_conf3 = LE_C3_ACON;
       sc->sc_addr = 0;
       sc->sc_memsize = LE_MCA_RAMSIZE;

       sc->sc_copytodesc = le_mca_copytobuf;
       sc->sc_copyfromdesc = le_mca_copyfrombuf;
       sc->sc_copytobuf = le_mca_copytobuf;
       sc->sc_copyfrombuf = le_mca_copyfrombuf;
       sc->sc_zerobuf = le_mca_zerobuf;

       sc->sc_rdcsr = le_mca_rdcsr;
       sc->sc_wrcsr = le_mca_wrcsr;
       sc->sc_hwinit = NULL;

       sc->sc_hwreset = le_mca_hwreset;

       /*
        * This is merely cosmetic since it's not possible to switch
        * the media anyway, even for MC2+.
        */
       if (supmedia != NULL) {
               sc->sc_supmedia = supmedia;
               sc->sc_nsupmedia = 1;
               sc->sc_defaultmedia = *supmedia;
       }

       lesc->sc_ih = mca_intr_establish(ma->ma_mc, irq, IPL_NET,
                       le_mca_intredge, sc);
       if (lesc->sc_ih == NULL) {
               aprint_error_dev(self,
                   "couldn't establish interrupt handler\n");
               return;
       }

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

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

       /*
        * We could check the IRQ bit of LE_PORT, but it seems to be unset
        * at this time anyway.
        */

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

/*
* Push a value to LANCE controller.
*/
static inline void
le_mca_wrreg(struct le_mca_softc *sc, int val, int type)
{

       /*
        * This follows steps in SKNET Personal/MC2+ docs:
        * 1. write reg. number to LANCE register
        * 2. write value RESET | type to port
        * 3. flag REGDO
        * 4. wait until REGREQ is cleared
        */
       if ((type & REGREAD) == 0)
               bus_space_write_2(sc->sc_memt, sc->sc_memh, LE_LANCEREG, val);
       bus_space_write_1(sc->sc_memt, sc->sc_memh, LE_PORT,
               RESET | type);
       bus_space_write_1(sc->sc_memt, sc->sc_memh, LE_REGIO,
               REGDO);
       /* Delay here doesn't seem to be necessary */
       /* delay(1);  */
       while (bus_space_read_1(sc->sc_memt, sc->sc_memh, LE_PORT) & REGREQ)
               ;
}

static void
le_mca_wrcsr(struct lance_softc *sc, uint16_t port, uint16_t val)
{
       struct le_mca_softc *lsc = (struct le_mca_softc *)sc;

       le_mca_set_RAP(lsc, port);
       le_mca_wrreg(lsc, val, RDATA | REGWRITE);
}

static uint16_t
le_mca_rdcsr(struct lance_softc *sc, uint16_t port)
{
       struct le_mca_softc *lsc = (struct le_mca_softc *)sc;

       le_mca_set_RAP(lsc, port);
       le_mca_wrreg(lsc, 0, RDATA | REGREAD);

       return (bus_space_read_2(lsc->sc_memt, lsc->sc_memh, LE_LANCEREG));
}

static void
le_mca_hwreset(struct lance_softc *sc)
{
       struct le_mca_softc *lsc = (struct le_mca_softc *)sc;

       bus_space_write_1(lsc->sc_memt, lsc->sc_memh, LE_PORT, 0);
       delay(5);       /* Delay >= 5 microseconds */
       bus_space_write_1(lsc->sc_memt, lsc->sc_memh, LE_PORT, RESET);
}

static void
le_mca_copytobuf(struct lance_softc *sc, void *from, int boff, int len)
{
       struct le_mca_softc *lsc = (struct le_mca_softc *)sc;

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

static void
le_mca_copyfrombuf(struct lance_softc *sc, void *to, int boff, int len)
{
       struct le_mca_softc *lsc = (struct le_mca_softc *)sc;

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

static void
le_mca_zerobuf(struct lance_softc *sc, int boff, int len)
{
       struct le_mca_softc *lsc = (struct le_mca_softc *)sc;

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

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