/*      $NetBSD: if_ie_sebuf.c,v 1.18 2025/12/16 18:24:47 andvar Exp $  */

/*-
 * Copyright (c) 1996 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Gordon W. Ross.
 *
 * 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.
 */

/*
 * Machine-dependent glue for the Intel Ethernet (ie) driver,
 * as found on the Sun3/E SCSI/Ethernet board.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_ie_sebuf.c,v 1.18 2025/12/16 18:24:47 andvar Exp $");

#include "opt_inet.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_ether.h>

#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/if_inarp.h>
#endif

#include <machine/autoconf.h>
#include <machine/cpu.h>
#include <machine/dvma.h>
#include <machine/idprom.h>
#include <machine/vmparam.h>

#include "i82586.h"
#include "if_iereg.h"
#include "if_ievar.h"
#include "sereg.h"
#include "sevar.h"

static void ie_sebuf_reset(struct ie_softc *);
static void ie_sebuf_attend(struct ie_softc *);
static void ie_sebuf_run(struct ie_softc *);

/*
 * zero/copy functions: OBIO can use the normal functions, but VME
 *    must do only byte or half-word (16 bit) accesses...
 */
static void *wmemcpy(void *, const void *, size_t);
static void *wmemset(void *, int, size_t);


/*
 * New-style autoconfig attachment
 */

static int  ie_sebuf_match(device_t, cfdata_t, void *);
static void ie_sebuf_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(ie_sebuf, sizeof(struct ie_softc),
    ie_sebuf_match, ie_sebuf_attach, NULL, NULL);

static int
ie_sebuf_match(device_t parent, cfdata_t cf, void *args)
{
        struct sebuf_attach_args *aa = args;

        /* Match by name. */
        if (strcmp(aa->name, "ie"))
                return 0;

        /* Anything else to check? */

        return 1;
}

static void
ie_sebuf_attach(device_t parent, device_t self, void *args)
{
        struct ie_softc *sc = device_private(self);
        struct sebuf_attach_args *aa = args;
        volatile struct ie_regs *regs;
        int     off;

        sc->sc_dev = self;
        sc->hard_type = IE_VME3E;
        sc->reset_586 = ie_sebuf_reset;
        sc->chan_attn = ie_sebuf_attend;
        sc->run_586   = ie_sebuf_run;
        sc->sc_memcpy = wmemcpy;
        sc->sc_memset = wmemset;

        /* Control regs mapped by parent. */
        sc->sc_reg = aa->regs;
        regs = (struct ie_regs *)sc->sc_reg;

        /*
         * On this hardware, the i82586 address zero
         * maps to the start of the board, which we
         * happen to know is 128K below (XXX).
         */
        sc->sc_iobase = aa->buf - 0x20000;

        /*
         * There is 128K of memory for the i82586 on
         * the Sun3/E SCSI/Ethernet board, and the
         * "sebuf" driver has mapped it in for us.
         * (Fixed in hardware; NOT configurable!)
         */
        if (aa->blen < SE_IEBUFSIZE)
                panic("ie_sebuf: bad size");
        sc->sc_msize = SE_IEBUFSIZE;
        sc->sc_maddr = aa->buf;

        /* Clear the memory. */
        (sc->sc_memset)(sc->sc_maddr, 0, sc->sc_msize);

        /*
         * XXX:  Unfortunately, the common driver code
         * is not ready to deal with more than 64K of
         * memory, so skip the first 64K.  Too bad.
         * Note: device needs the SCP at the end.
         */
        sc->sc_msize -= 0x10000;
        sc->sc_maddr = (char *)sc->sc_maddr + 0x10000;

        /*
         * Set the System Configuration Pointer (SCP).
         * Its location is system-dependent because the
         * i82586 reads it from a fixed physical address.
         * On this hardware, the i82586 address is just
         * masked down to 17 bits, so the SCP is found
         * at the end of the RAM on the VME board.
         */
        off = IE_SCP_ADDR & 0xFFFF;
        sc->scp = (volatile void *)((char *)sc->sc_maddr + off);

        /*
         * The rest of ram is used for buffers, etc.
         */
        sc->buf_area = sc->sc_maddr;
        sc->buf_area_sz = off;

        /* Install interrupt handler. */
        regs->ie_ivec = aa->ca.ca_intvec;
        isr_add_vectored(ie_intr, sc, aa->ca.ca_intpri, aa->ca.ca_intvec);

        /* Set the ethernet address. */
        idprom_etheraddr(sc->sc_addr);

        /* Do machine-independent parts of attach. */
        ie_attach(sc);

}

/* Whack the "channel attetion" line. */
void
ie_sebuf_attend(struct ie_softc *sc)
{
        volatile struct ie_regs *regs = (struct ie_regs *)sc->sc_reg;

        regs->ie_csr |= IE_CSR_ATTEN;   /* flag! */
        regs->ie_csr &= ~IE_CSR_ATTEN;  /* down. */
}

/*
 * This is called during driver attach.
 * Reset and initialize.
 */
void
ie_sebuf_reset(struct ie_softc *sc)
{
        volatile struct ie_regs *regs = (struct ie_regs *)sc->sc_reg;
        regs->ie_csr = IE_CSR_RESET;
        delay(20);
        regs->ie_csr = (IE_CSR_NOLOOP | IE_CSR_IENAB);
}

/*
 * This is called at the end of ieinit().
 * optional.
 */
void
ie_sebuf_run(struct ie_softc *sc)
{

        /* do it all in reset */
}

/*
 * wmemcpy/wmemset - like memcpy/memset but largest access is 16-bits,
 * and also does byte swaps...
 * XXX - Would be nice to have asm versions in some library...
 */

static void *
wmemset(void *vb, int val, size_t l)
{
        uint8_t *b = vb;
        uint8_t *be = b + l;
        uint16_t *sp;

        if (l == 0)
                return vb;

        /* front, */
        if ((uint32_t)b & 1)
                *b++ = val;

        /* back, */
        if (b != be && ((uint32_t)be & 1) != 0) {
                be--;
                *be = val;
        }

        /* and middle. */
        sp = (uint16_t *)b;
        while (sp != (uint16_t *)be)
                *sp++ = val;

        return vb;
}

static void *
wmemcpy(void *dst, const void *src, size_t l)
{
        const uint8_t *b1e, *b1 = src;
        uint8_t *b2 = dst;
        const uint16_t *sp;
        int bstore = 0;

        if (l == 0)
                return dst;

        /* front, */
        if ((uint32_t)b1 & 1) {
                *b2++ = *b1++;
                l--;
        }

        /* middle, */
        sp = (const uint16_t *)b1;
        b1e = b1 + l;
        if (l & 1)
                b1e--;
        bstore = (uint32_t)b2 & 1;

        while (sp < (const uint16_t *)b1e) {
                if (bstore) {
                        b2[1] = *sp & 0xff;
                        b2[0] = *sp >> 8;
                } else
                        *((uint16_t *)b2) = *sp;
                sp++;
                b2 += 2;
        }

        /* and back. */
        if (l & 1)
                *b2 = *b1e;

        return dst;
}