/*      $NetBSD: if_ie_vme.c,v 1.24 2024/12/20 23:52:00 tsutsui 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_ie_vme.c,v 1.24 2024/12/20 23:52:00 tsutsui 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"

static void ie_vmereset(struct ie_softc *);
static void ie_vmeattend(struct ie_softc *);
static void ie_vmerun(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_vme_match(device_t, cfdata_t, void *);
static void ie_vme_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(ie_vme, sizeof(struct ie_softc),
   ie_vme_match, ie_vme_attach, NULL, NULL);

static int
ie_vme_match(device_t parent, cfdata_t cf, void *args)
{
       struct confargs *ca = args;

       /* No default VME address. */
       if (ca->ca_paddr == -1)
               return 0;

       /* Make sure something is there... */
       if (bus_peek(ca->ca_bustype, ca->ca_paddr, 2) == -1)
               return 0;

       /* Default interrupt priority. */
       if (ca->ca_intpri == -1)
               ca->ca_intpri = 3;

       return 1;
}

/*
* *note*: we don't detect the difference between a VME3E and
* a multibus/vme card.   if you want to use a 3E you'll have
* to fix this.
*/
void
ie_vme_attach(device_t parent, device_t self, void *args)
{
       struct ie_softc *sc = device_private(self);
       struct confargs *ca = args;
       volatile struct ievme *iev;
       u_long  rampaddr;
       int     lcv, off;

       sc->sc_dev = self;
       sc->hard_type = IE_VME;
       sc->reset_586 = ie_vmereset;
       sc->chan_attn = ie_vmeattend;
       sc->run_586 = ie_vmerun;
       sc->sc_memcpy = wmemcpy;
       sc->sc_memset = wmemset;

       /*
        * There is 64K of memory on the VME board.
        * (determined by hardware - NOT configurable!)
        */
       sc->sc_msize = 0x10000; /* MEMSIZE 64K */

       /* Map in the board control regs. */
       sc->sc_reg = bus_mapin(ca->ca_bustype, ca->ca_paddr,
                                                  sizeof(struct ievme));
       iev = (volatile struct ievme *) sc->sc_reg;

       /*
        * Find and map in the board memory.
        */
       /* top 12 bits */
       rampaddr = ca->ca_paddr & 0xfff00000;
       /* 4 more */
       rampaddr |= ((iev->status & IEVME_HADDR) << 16);
       sc->sc_maddr = bus_mapin(ca->ca_bustype, rampaddr, sc->sc_msize);

       /*
        * On this hardware, the i82586 address is just
        * masked to 16 bits, so sc_iobase == sc_maddr
        */
       sc->sc_iobase = sc->sc_maddr;

       /*
        * Set up on-board mapping registers for linear map.
        */
       iev->pectrl |= IEVME_PARACK; /* clear to start */
       for (lcv = 0; lcv < IEVME_MAPSZ; lcv++)
               iev->pgmap[lcv] = IEVME_SBORDR | IEVME_OBMEM | lcv;
       (sc->sc_memset)(sc->sc_maddr, 0, sc->sc_msize);

       /*
        * 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 16 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;

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

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

       /* Install interrupt handler. */
       isr_add_vectored(ie_intr, sc, ca->ca_intpri, ca->ca_intvec);
}


/*
* MULTIBUS/VME support
*/

void
ie_vmeattend(struct ie_softc *sc)
{
       volatile struct ievme *iev = (struct ievme *)sc->sc_reg;

       iev->status |= IEVME_ATTEN;     /* flag! */
       iev->status &= ~IEVME_ATTEN;    /* down. */
}

void
ie_vmereset(struct ie_softc *sc)
{
       volatile struct ievme *iev = (struct ievme *)sc->sc_reg;

       iev->status = IEVME_RESET;
       delay(20);
       iev->status = (IEVME_ONAIR | IEVME_IENAB | IEVME_PEINT);
}

void
ie_vmerun(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;
}