/*      $NetBSD: netif_of.c,v 1.9 2011/07/30 04:18:38 jakllsch Exp $    */

/*
* Copyright (C) 1995 Wolfgang Solfrank.
* Copyright (C) 1995 TooLs GmbH.
* 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.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
*    derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
*/

/*
* Open Firmware does most of the job for interfacing to the hardware,
* so it is easiest to just replace the netif module with
* this adaptation to the PROM network interface.
*
* Note: this is based in part on sys/arch/sparc/stand/netif_sun.c
*/

#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/libsa/netif.h>

#include <machine/promlib.h>

#include "ofdev.h"

static struct netif netif_of;

struct iodesc sockets[SOPEN_MAX];

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

int
netif_open(void *machdep_hint)
{
       struct of_dev *op = machdep_hint;
       struct iodesc *io;

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

       netif_of.nif_devdata = op;
       io->io_netif = &netif_of;

       /* Put our ethernet address in io->myea */
       _prom_getprop(prom_instance_to_package(op->handle),
                  "mac-address", io->myea, sizeof io->myea);

#ifdef  NETIF_DEBUG
       printf("OK\n");
#endif
       return 0;
}

int
netif_close(int fd)
{
       struct iodesc *io;
       struct netif *ni;

#ifdef  NETIF_DEBUG
       printf("netif_close(%x)...", fd);
#endif
       if (fd != 0) {
#ifdef  NETIF_DEBUG
               printf("EBADF\n");
#endif
               errno = EBADF;
               return -1;
       }

       io = &sockets[fd];
       ni = io->io_netif;
       if (ni != NULL) {
               ni->nif_devdata = NULL;
               io->io_netif = NULL;
       }
#ifdef  NETIF_DEBUG
       printf("OK\n");
#endif
       return 0;
}

/*
* 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 of_dev *op;
       ssize_t rv;
       size_t sendlen;

       op = ((struct netif *)desc->io_netif)->nif_devdata;

#ifdef  NETIF_DEBUG
       {
               struct ether_header *eh;

               printf("netif_put: desc=%p pkt=%p len=%zu\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 %zu\n", sendlen);
#endif
       }

       rv = prom_write(op->handle, pkt, sendlen);

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

       if (rv > len)
               rv = len;

       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 of_dev *op;
       int tick0, tmo_ms;
       int len;

       op = ((struct netif *)desc->io_netif)->nif_devdata;

#ifdef  NETIF_DEBUG
       printf("netif_get: pkt=%p, maxlen=%zu, tmo=%d\n",
              pkt, maxlen, timo);
#endif

       tmo_ms = timo * 1000;
       tick0 = prom_ticks();

       do {
               len = prom_read(op->handle, pkt, maxlen);
       } while ((len == -2 || len == 0) &&
                (prom_ticks() - tick0 < tmo_ms));

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

       if (len < 12)
               return -1;

#ifdef  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;
}

/*
* Shouldn't really be here, but is used solely for networking, so...
*/
satime_t
getsecs(void)
{

       return prom_ticks() / 1000;
}