/*      $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];
}