/*
 *	Sealevel Systems 4021 driver.
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 *
 *	(c) Copyright 1999, 2001 Alan Cox
 *	(c) Copyright 2001 Red Hat Inc.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <net/arp.h>

#include <asm/irq.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/byteorder.h>
#include <net/syncppp.h>
#include "z85230.h"


struct slvl_device
{
	void *if_ptr;	/* General purpose pointer (used by SPPP) */
	struct z8530_channel *chan;
	struct ppp_device pppdev;
	int channel;
};


struct slvl_board
{
	struct slvl_device *dev[2];
	struct z8530_dev board;
	int iobase;
};

/*
 *	Network driver support routines
 */

/*
 *	Frame receive. Simple for our card as we do sync ppp and there
 *	is no funny garbage involved
 */
 
static void sealevel_input(struct z8530_channel *c, struct sk_buff *skb)
{
	/* Drop the CRC - it's not a good idea to try and negotiate it ;) */
	skb_trim(skb, skb->len-2);
	skb->protocol=htons(ETH_P_WAN_PPP);
	skb->mac.raw=skb->data;
	skb->dev=c->netdevice;
	/*
	 *	Send it to the PPP layer. We don't have time to process
	 *	it right now.
	 */
	netif_rx(skb);
	c->netdevice->last_rx = jiffies;
}
 
/*
 *	We've been placed in the UP state
 */ 
 
static int sealevel_open(struct net_device *d)
{
	struct slvl_device *slvl=d->priv;
	int err = -1;
	int unit = slvl->channel;
	
	/*
	 *	Link layer up. 
	 */

	switch(unit)
	{
		case 0:
			err=z8530_sync_dma_open(d, slvl->chan);
			break;
		case 1:
			err=z8530_sync_open(d, slvl->chan);
			break;
	}
	
	if(err)
		return err;
	/*
	 *	Begin PPP
	 */
	err=sppp_open(d);
	if(err)
	{
		switch(unit)
		{
			case 0:
				z8530_sync_dma_close(d, slvl->chan);
				break;
			case 1:
				z8530_sync_close(d, slvl->chan);
				break;
		}				
		return err;
	}
	
	slvl->chan->rx_function=sealevel_input;
	
	/*
	 *	Go go go
	 */
	netif_start_queue(d);
	return 0;
}

static int sealevel_close(struct net_device *d)
{
	struct slvl_device *slvl=d->priv;
	int unit = slvl->channel;
	
	/*
	 *	Discard new frames
	 */
	
	slvl->chan->rx_function=z8530_null_rx;
		
	/*
	 *	PPP off
	 */
	sppp_close(d);
	/*
	 *	Link layer down
	 */

	netif_stop_queue(d);
		
	switch(unit)
	{
		case 0:
			z8530_sync_dma_close(d, slvl->chan);
			break;
		case 1:
			z8530_sync_close(d, slvl->chan);
			break;
	}
	return 0;
}

static int sealevel_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
{
	/* struct slvl_device *slvl=d->priv;
	   z8530_ioctl(d,&slvl->sync.chanA,ifr,cmd) */
	return sppp_do_ioctl(d, ifr,cmd);
}

static struct net_device_stats *sealevel_get_stats(struct net_device *d)
{
	struct slvl_device *slvl=d->priv;
	if(slvl)
		return z8530_get_stats(slvl->chan);
	else
		return NULL;
}

/*
 *	Passed PPP frames, fire them downwind.
 */
 
static int sealevel_queue_xmit(struct sk_buff *skb, struct net_device *d)
{
	struct slvl_device *slvl=d->priv;
	return z8530_queue_xmit(slvl->chan, skb);
}

static int sealevel_neigh_setup(struct neighbour *n)
{
	if (n->nud_state == NUD_NONE) {
		n->ops = &arp_broken_ops;
		n->output = n->ops->output;
	}
	return 0;
}

static int sealevel_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
{
	if (p->tbl->family == AF_INET) {
		p->neigh_setup = sealevel_neigh_setup;
		p->ucast_probes = 0;
		p->mcast_probes = 0;
	}
	return 0;
}

static int sealevel_attach(struct net_device *dev)
{
	struct slvl_device *sv = dev->priv;
	sppp_attach(&sv->pppdev);
	return 0;
}

static void sealevel_detach(struct net_device *dev)
{
	sppp_detach(dev);
}
		
static void slvl_setup(struct net_device *d)
{
	d->open = sealevel_open;
	d->stop = sealevel_close;
	d->init = sealevel_attach;
	d->uninit = sealevel_detach;