/*      $NetBSD: netif_news.c,v 1.9 2014/09/21 16:35:44 christos Exp $  */

/*
 * Copyright (c) 1995 Gordon W. Ross
 * All rights reserved.
 *
 * 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 AUTHOR ``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 AUTHOR 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.
 */

/*
 * The Sun PROM has a fairly general set of network drivers,
 * so it is easiest to just replace the netif module with
 * this adaptation to the PROM network interface.
 */

#include <sys/param.h>
#include <sys/socket.h>

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

#include <netinet/in.h>
#include <netinet/in_systm.h>

#include <lib/libsa/stand.h>
#include <lib/libsa/net.h>
#include <lib/libkern/libkern.h>

#include <machine/apcall.h>
#include <promdev.h>

#include "netif_news.h"

#ifdef NETIF_DEBUG
int netif_debug;
#endif

static struct iodesc sdesc;

struct iodesc *
socktodesc(int sock)
{
        if (sock != 0) {
                return NULL;
        }
        return &sdesc;
}

int
netif_news_open(struct romdev *pd)
{
        struct iodesc *io;

        /* find a free socket */
        io = &sdesc;
        if (io->io_netif) {
#ifdef  DEBUG
                printf("netif_open: device busy\n");
#endif
                errno = ENFILE;
                return -1;
        }
        memset(io, 0, sizeof(*io));

        io->io_netif = pd;

        /* Put our ethernet address in io->myea */
        prom_getether(pd, io->myea);

        return 0;
}

void
netif_news_close(int fd)
{
        struct iodesc *io;

        io = &sdesc;
        io->io_netif = NULL;
}

/*
 * Send a packet.  The ether header is already there.
 * Return the length sent (or -1 on error).
 */
ssize_t
netif_put(struct iodesc *desc, void *pkt, size_t len)
{
        struct romdev *pd;
        ssize_t rv;
        size_t sendlen;

        pd = (struct romdev *)desc->io_netif;

#ifdef NETIF_DEBUG
        if (netif_debug) {
                struct ether_header *eh;

                printf("netif_put: desc=0x%x pkt=0x%x len=%d\n",
                           desc, pkt, len);
                eh = pkt;
                printf("dst: %s ", ether_sprintf(eh->ether_dhost));
                printf("src: %s ", ether_sprintf(eh->ether_shost));
                printf("type: 0x%x\n", eh->ether_type & 0xFFFF);
        }
#endif

        sendlen = len;
        if (sendlen < 60) {
                sendlen = 60;
#ifdef NETIF_DEBUG
                printf("netif_put: length padded to %d\n", sendlen);
#endif
        }

        rv = apcall_write(pd->fd, pkt, sendlen);

#ifdef NETIF_DEBUG
        if (netif_debug)
                printf("netif_put: xmit returned %d\n", rv);
#endif

        return rv;
}

/*
 * Receive a packet, including the ether header.
 * Return the total length received (or -1 on error).
 */
ssize_t
netif_get(struct iodesc *desc, void *pkt, size_t maxlen, saseconds_t timo)
{
        struct romdev *pd;
        satime_t tick0;
        ssize_t len;

        pd = (struct romdev *)desc->io_netif;

#ifdef NETIF_DEBUG
        if (netif_debug)
                printf("netif_get: pkt=0x%x, maxlen=%d, tmo=%d\n",
                           pkt, maxlen, timo);
#endif

        tick0 = getsecs();

        do {
                len = apcall_read(pd->fd, pkt, maxlen);
        } while ((len == 0) && ((getsecs() - tick0) < timo));

#ifdef NETIF_DEBUG
        if (netif_debug)
                printf("netif_get: received len=%d\n", len);
#endif

        if (len < 12)
                return -1;

#ifdef NETIF_DEBUG
        if (netif_debug) {
                struct ether_header *eh = pkt;

                printf("dst: %s ", ether_sprintf(eh->ether_dhost));
                printf("src: %s ", ether_sprintf(eh->ether_shost));
                printf("type: 0x%x\n", eh->ether_type & 0xFFFF);
        }
#endif

        return len;
}

int
prom_getether(struct romdev *pd, u_char *ea)
{

        if (apcall_ioctl(pd->fd, APIOCGIFHWADDR, ea))
                return -1;

#ifdef BOOT_DEBUG
        printf("hardware address %s\n", ether_sprintf(ea));
#endif

        return 0;
}

satime_t
getsecs(void)
{
        u_int t[2];

        apcall_gettimeofday(t);         /* time = t[0](s) + t[1](ns) */
        return t[0];
}