/*      $NetBSD: if_elmc_mca.c,v 1.33 2022/07/12 02:06:07 thorpej Exp $ */

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

/*
* 3Com 3c523 EtherLink/MC Ethernet card driver (uses i82586 Ethernet chip).
*
* The 3c523-specific hooks were derived from Linux driver (file
* drivers/net/3c523.[ch]).
*
* This driver uses generic i82586 stuff. See also ai(4), ef(4), ix(4).
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_elmc_mca.c,v 1.33 2022/07/12 02:06:07 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/errno.h>
#include <sys/device.h>
#include <sys/protosw.h>
#include <sys/socket.h>

#include <net/if.h>
#include <net/if_types.h>
#include <net/if_media.h>
#include <net/if_ether.h>

#include <sys/bus.h>

#include <dev/ic/i82586reg.h>
#include <dev/ic/i82586var.h>
#include <dev/mca/mcadevs.h>
#include <dev/mca/mcavar.h>

#include <dev/mca/3c523reg.h>

struct elmc_mca_softc {
       struct ie_softc sc_ie;

       bus_space_tag_t sc_regt;        /* space tag for registers */
       bus_space_handle_t sc_regh;     /* space handle for registers */

       void            *sc_ih;         /* interrupt handle */
};

int     elmc_mca_match(device_t, cfdata_t, void *);
void    elmc_mca_attach(device_t, device_t, void *);

static void     elmc_mca_copyin(struct ie_softc *, void *, int, size_t);
static void     elmc_mca_copyout(struct ie_softc *, const void *, int, size_t);
static u_int16_t elmc_mca_read_16(struct ie_softc *, int);
static void     elmc_mca_write_16(struct ie_softc *, int, u_int16_t);
static void     elmc_mca_write_24(struct ie_softc *, int, int);
static void     elmc_mca_attn(struct ie_softc *, int);
static void     elmc_mca_hwreset(struct ie_softc *, int);
static int      elmc_mca_intrhook(struct ie_softc *, int);

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

       switch (ma->ma_id) {
       case MCA_PRODUCT_3C523:
               return 1;
       }

       return 0;
}

void
elmc_mca_attach(device_t parent, device_t self, void *aux)
{
       struct elmc_mca_softc *asc = device_private(self);
       struct ie_softc *sc = &asc->sc_ie;
       struct mca_attach_args *ma = aux;
       int pos2, pos3, i, revision;
       int iobase, irq, pbram_addr;
       bus_space_handle_t ioh, memh;
       u_int8_t myaddr[ETHER_ADDR_LEN];

       pos2 = mca_conf_read(ma->ma_mc, ma->ma_slot, 2);
       pos3 = mca_conf_read(ma->ma_mc, ma->ma_slot, 3);

       /*
        * POS register 2: (adf pos0)
        *
        * 7 6 5 4 3 2 1 0
        *     \ \_/ \_/ \__ enable: 0=adapter disabled, 1=adapter enabled
        *      \  \   \____ I/O Address Range: 00=300-307, 01=1300-1307,
        *       \  \                           10=2300-2307, 11=3300-3307
        *        \  \______ Packet Buffer RAM Address Range:
        *         \            00=0x0c0000-0x0c5fff 01=0x0c8000-0x0cdfff
        *          \           10=0x0d0000-0x0d5fff 11=0x0d8000-0x0ddfff
        *           \______ Transceiver Type: 0=onboard(BNC) 1=ext(DIX)
        *
        * POS register 3: (adf pos1)
        *
        * 7 6 5 4 3 2 1 0
        *          \____/
        *               \__ Interrupt level: 0100=3, 0010=7, 1000=9, 0001=12
        */

       iobase = ELMC_IOADDR_BASE + (0x1000 * ((pos2 & 0x6) >> 1));

       /* get irq */
       switch (pos3 & 0x1f) {
       case 4: irq = 3; break;
       case 2: irq = 7; break;
       case 8: irq = 9; break;
       case 1: irq = 12; break;
       default:
               aprint_error(": cannot determine irq\n");
               return;
       }

       sc->sc_dev = self;
       pbram_addr = ELMC_MADDR_BASE + (((pos2 & 0x18) >> 3) * 0x8000);

       aprint_normal(" slot %d irq %d: 3Com EtherLink/MC Ethernet Adapter "
           "(3C523)\n", ma->ma_slot + 1, irq);

       /* map the pio registers */
       if (bus_space_map(ma->ma_iot, iobase, ELMC_IOADDR_SIZE, 0, &ioh)) {
               aprint_error_dev(self, "unable to map i/o space\n");
               return;
       }

       /*
        * 3c523 has a 24K memory. The first 16K is the shared memory, while
        * the last 8K is for the EtherStart BIOS ROM, which we don't care
        * about. Just use the first 16K.
        */
       if (bus_space_map(ma->ma_memt, pbram_addr, ELMC_MADDR_SIZE, 0, &memh)) {
               aprint_error_dev(self, "unable to map memory space\n");
               if (pbram_addr == 0xc0000) {
                       aprint_error_dev(self,
                           "memory space 0xc0000 may conflict with vga\n");
               }

               bus_space_unmap(ma->ma_iot, ioh, ELMC_IOADDR_SIZE);
               return;
       }

       asc->sc_regt = ma->ma_iot;
       asc->sc_regh = ioh;

       sc->hwinit = NULL;
       sc->intrhook = elmc_mca_intrhook;
       sc->hwreset = elmc_mca_hwreset;
       sc->chan_attn = elmc_mca_attn;

       sc->ie_bus_barrier = NULL;

       sc->memcopyin = elmc_mca_copyin;
       sc->memcopyout = elmc_mca_copyout;
       sc->ie_bus_read16 = elmc_mca_read_16;
       sc->ie_bus_write16 = elmc_mca_write_16;
       sc->ie_bus_write24 = elmc_mca_write_24;

       sc->do_xmitnopchain = 0;

       sc->sc_mediachange = NULL;
       sc->sc_mediastatus = NULL;

       sc->bt = ma->ma_memt;
       sc->bh = memh;

       /* Map i/o space. */
       sc->sc_msize = ELMC_MADDR_SIZE;
       sc->sc_maddr = (void *)memh;
       sc->sc_iobase = (char *)sc->sc_maddr + sc->sc_msize - (1 << 24);

       /* set up pointers to important on-card control structures */
       sc->iscp = 0;
       sc->scb = IE_ISCP_SZ;
       sc->scp = sc->sc_msize + IE_SCP_ADDR - (1 << 24);

       sc->buf_area = sc->scb + IE_SCB_SZ;
       sc->buf_area_sz = sc->sc_msize - IE_ISCP_SZ - IE_SCB_SZ - IE_SCP_SZ;

       /*
        * According to docs, we might need to read the interrupt number and
        * write it back to the IRQ select register, since the POST might not
        * configure the IRQ properly.
        */
       (void) mca_conf_write(ma->ma_mc, ma->ma_slot, 3, pos3 & 0x1f);

       /* reset the card first */
       elmc_mca_hwreset(sc, CARD_RESET);
       delay(1000000 / ( 1<< 5));

       /* zero card memory */
       bus_space_set_region_1(sc->bt, sc->bh, 0, 0, sc->sc_msize);

       /* set card to 16-bit bus mode */
       bus_space_write_1(sc->bt, sc->bh, IE_SCP_BUS_USE((u_long)sc->scp),
                         IE_SYSBUS_16BIT);

       /* set up pointers to key structures */
       elmc_mca_write_24(sc, IE_SCP_ISCP((u_long)sc->scp), (u_long) sc->iscp);
       elmc_mca_write_16(sc, IE_ISCP_SCB((u_long)sc->iscp), (u_long) sc->scb);
       elmc_mca_write_24(sc, IE_ISCP_BASE((u_long)sc->iscp),
           (u_long) sc->iscp);

       /* flush setup of pointers, check if chip answers */
       if (!i82586_proberam(sc)) {
               aprint_error_dev(self, "can't talk to i82586!\n");

               bus_space_unmap(asc->sc_regt, asc->sc_regh, ELMC_IOADDR_SIZE);
               bus_space_unmap(sc->bt, sc->bh, ELMC_MADDR_SIZE);
               return;
       }

       /* revision is stored in the first 4 bits of the revision register */
       revision = (int) bus_space_read_1(asc->sc_regt, asc->sc_regh,
                               ELMC_REVISION) & ELMC_REVISION_MASK;

       /* dump known info */
       aprint_normal("%s: rev %d, i/o %#04x-%#04x, mem %#06x-%#06x, "
           "%sternal xcvr\n",
           device_xname(self), revision,
           iobase, iobase + ELMC_IOADDR_SIZE - 1,
           pbram_addr, pbram_addr + ELMC_MADDR_SIZE - 1,
           (pos2 & 0x20) ? "ex" : "in");

       /*
        * Hardware ethernet address is stored in the first six bytes
        * of the IO space.
        */
       for(i=0; i < MIN(6, ETHER_ADDR_LEN); i++)
               myaddr[i] = bus_space_read_1(asc->sc_regt, asc->sc_regh, i);

       printf("%s:", device_xname(self));
       i82586_attach(sc, "3C523", myaddr, NULL, 0, 0);

       /* establish interrupt handler */
       asc->sc_ih = mca_intr_establish(ma->ma_mc, irq, IPL_NET, i82586_intr,
                       sc);
       if (asc->sc_ih == NULL) {
               aprint_error_dev(self,
                   "couldn't establish interrupt handler\n");
               return;
       }
}

static void
elmc_mca_copyin (struct ie_softc *sc, void *dst, int offset, size_t size)
{
       int dribble;
       u_int8_t* bptr = dst;

       if (offset % 2) {
               *bptr = bus_space_read_1(sc->bt, sc->bh, offset);
               offset++; bptr++; size--;
       }

       dribble = size % 2;
       bus_space_read_region_2(sc->bt, sc->bh, offset, (u_int16_t *) bptr,
                               size >> 1);

       if (dribble) {
               bptr += size - 1;
               offset += size - 1;
               *bptr = bus_space_read_1(sc->bt, sc->bh, offset);
       }
}

static void
elmc_mca_copyout (struct ie_softc *sc, const void *src, int offset,
   size_t size)
{
       int dribble;
       const u_int8_t* bptr = src;

       if (offset % 2) {
               bus_space_write_1(sc->bt, sc->bh, offset, *bptr);
               offset++; bptr++; size--;
       }

       dribble = size % 2;
       bus_space_write_region_2(sc->bt, sc->bh, offset,
           (const u_int16_t *)bptr, size >> 1);
       if (dribble) {
               bptr += size - 1;
               offset += size - 1;
               bus_space_write_1(sc->bt, sc->bh, offset, *bptr);
       }
}

static u_int16_t
elmc_mca_read_16 (struct ie_softc *sc, int offset)
{
       return bus_space_read_2(sc->bt, sc->bh, offset);
}

static void
elmc_mca_write_16 (struct ie_softc *sc, int offset, u_int16_t value)
{
       bus_space_write_2(sc->bt, sc->bh, offset, value);
}

static void
elmc_mca_write_24 (struct ie_softc *sc, int offset, int addr)
{
       bus_space_write_4(sc->bt, sc->bh, offset, addr +
           (u_long) sc->sc_maddr - (u_long) sc->sc_iobase);
}

/*
* Channel attention hook.
*/
static void
elmc_mca_attn(struct ie_softc *sc, int why)
{
       struct elmc_mca_softc* asc = (struct elmc_mca_softc *) sc;
       int intr = 0;

       switch (why) {
       case CHIP_PROBE:
               intr = 0;
               break;
       case CARD_RESET:
               intr = ELMC_CTRL_INT;
               break;
       }

       bus_space_write_1(asc->sc_regt, asc->sc_regh, ELMC_CTRL,
           ELMC_CTRL_RST | ELMC_CTRL_BS3 | ELMC_CTRL_CHA | intr);
       delay(1);       /* should be > 500 ns */
       bus_space_write_1(asc->sc_regt, asc->sc_regh, ELMC_CTRL,
           ELMC_CTRL_RST | ELMC_CTRL_BS3 | intr);
}

/*
* Do full card hardware reset.
*/
static void
elmc_mca_hwreset(struct ie_softc *sc, int why)
{
       struct elmc_mca_softc* asc = (struct elmc_mca_softc *) sc;

       /* toggle the RST bit low then high */
       bus_space_write_1(asc->sc_regt, asc->sc_regh, ELMC_CTRL,
           ELMC_CTRL_BS3 | ELMC_CTRL_LOOP);
       delay(1);       /* should be > 500 ns */
       bus_space_write_1(asc->sc_regt, asc->sc_regh, ELMC_CTRL,
           ELMC_CTRL_BS3 | ELMC_CTRL_LOOP | ELMC_CTRL_RST);

       elmc_mca_attn(sc, why);
}

/*
* Interrupt hook.
*/
static int
elmc_mca_intrhook(struct ie_softc *sc, int why)
{
       switch (why) {
       case INTR_ACK:
               elmc_mca_attn(sc, CHIP_PROBE);
               break;
       default:
               /* do nothing */
               break;
       }

       return (0);
}

CFATTACH_DECL_NEW(elmc_mca, sizeof(struct elmc_mca_softc),
   elmc_mca_match, elmc_mca_attach, NULL, NULL);

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