471 lines
8.9 KiB
C
471 lines
8.9 KiB
C
/*
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* Sealevel Systems 4021 driver.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* (c) Copyright 1999, 2001 Alan Cox
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* (c) Copyright 2001 Red Hat Inc.
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <net/arp.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#include <asm/dma.h>
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#include <asm/byteorder.h>
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#include <net/syncppp.h>
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#include "z85230.h"
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struct slvl_device
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{
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void *if_ptr; /* General purpose pointer (used by SPPP) */
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struct z8530_channel *chan;
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struct ppp_device pppdev;
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int channel;
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};
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struct slvl_board
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{
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struct slvl_device *dev[2];
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struct z8530_dev board;
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int iobase;
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};
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/*
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* Network driver support routines
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*/
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/*
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* Frame receive. Simple for our card as we do sync ppp and there
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* is no funny garbage involved
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*/
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static void sealevel_input(struct z8530_channel *c, struct sk_buff *skb)
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{
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/* Drop the CRC - it's not a good idea to try and negotiate it ;) */
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skb_trim(skb, skb->len-2);
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skb->protocol=htons(ETH_P_WAN_PPP);
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skb->mac.raw=skb->data;
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skb->dev=c->netdevice;
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/*
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* Send it to the PPP layer. We don't have time to process
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* it right now.
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*/
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netif_rx(skb);
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c->netdevice->last_rx = jiffies;
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}
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/*
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* We've been placed in the UP state
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*/
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static int sealevel_open(struct net_device *d)
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{
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struct slvl_device *slvl=d->priv;
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int err = -1;
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int unit = slvl->channel;
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/*
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* Link layer up.
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*/
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switch(unit)
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{
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case 0:
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err=z8530_sync_dma_open(d, slvl->chan);
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break;
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case 1:
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err=z8530_sync_open(d, slvl->chan);
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break;
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}
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if(err)
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return err;
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/*
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* Begin PPP
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*/
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err=sppp_open(d);
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if(err)
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{
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switch(unit)
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{
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case 0:
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z8530_sync_dma_close(d, slvl->chan);
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break;
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case 1:
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z8530_sync_close(d, slvl->chan);
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break;
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}
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return err;
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}
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slvl->chan->rx_function=sealevel_input;
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/*
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* Go go go
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*/
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netif_start_queue(d);
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return 0;
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}
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static int sealevel_close(struct net_device *d)
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{
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struct slvl_device *slvl=d->priv;
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int unit = slvl->channel;
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/*
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* Discard new frames
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*/
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slvl->chan->rx_function=z8530_null_rx;
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/*
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* PPP off
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*/
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sppp_close(d);
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/*
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* Link layer down
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*/
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netif_stop_queue(d);
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switch(unit)
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{
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case 0:
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z8530_sync_dma_close(d, slvl->chan);
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break;
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case 1:
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z8530_sync_close(d, slvl->chan);
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break;
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}
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return 0;
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}
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static int sealevel_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
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{
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/* struct slvl_device *slvl=d->priv;
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z8530_ioctl(d,&slvl->sync.chanA,ifr,cmd) */
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return sppp_do_ioctl(d, ifr,cmd);
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}
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static struct net_device_stats *sealevel_get_stats(struct net_device *d)
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{
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struct slvl_device *slvl=d->priv;
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if(slvl)
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return z8530_get_stats(slvl->chan);
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else
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return NULL;
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}
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/*
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* Passed PPP frames, fire them downwind.
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*/
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static int sealevel_queue_xmit(struct sk_buff *skb, struct net_device *d)
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{
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struct slvl_device *slvl=d->priv;
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return z8530_queue_xmit(slvl->chan, skb);
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}
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static int sealevel_neigh_setup(struct neighbour *n)
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{
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if (n->nud_state == NUD_NONE) {
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n->ops = &arp_broken_ops;
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n->output = n->ops->output;
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}
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return 0;
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}
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static int sealevel_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
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{
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if (p->tbl->family == AF_INET) {
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p->neigh_setup = sealevel_neigh_setup;
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p->ucast_probes = 0;
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p->mcast_probes = 0;
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}
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return 0;
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}
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static int sealevel_attach(struct net_device *dev)
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{
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struct slvl_device *sv = dev->priv;
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sppp_attach(&sv->pppdev);
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return 0;
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}
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static void sealevel_detach(struct net_device *dev)
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{
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sppp_detach(dev);
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}
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static void slvl_setup(struct net_device *d)
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{
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d->open = sealevel_open;
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d->stop = sealevel_close;
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d->init = sealevel_attach;
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d->uninit = sealevel_detach;
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d->hard_start_xmit = sealevel_queue_xmit;
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d->get_stats = sealevel_get_stats;
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d->set_multicast_list = NULL;
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d->do_ioctl = sealevel_ioctl;
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d->neigh_setup = sealevel_neigh_setup_dev;
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d->set_mac_address = NULL;
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}
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static inline struct slvl_device *slvl_alloc(int iobase, int irq)
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{
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struct net_device *d;
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struct slvl_device *sv;
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d = alloc_netdev(sizeof(struct slvl_device), "hdlc%d",
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slvl_setup);
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if (!d)
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return NULL;
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sv = d->priv;
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sv->if_ptr = &sv->pppdev;
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sv->pppdev.dev = d;
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d->base_addr = iobase;
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d->irq = irq;
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return sv;
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}
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/*
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* Allocate and setup Sealevel board.
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*/
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static __init struct slvl_board *slvl_init(int iobase, int irq,
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int txdma, int rxdma, int slow)
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{
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struct z8530_dev *dev;
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struct slvl_board *b;
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/*
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* Get the needed I/O space
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*/
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if(!request_region(iobase, 8, "Sealevel 4021"))
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{
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printk(KERN_WARNING "sealevel: I/O 0x%X already in use.\n", iobase);
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return NULL;
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}
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b = kmalloc(sizeof(struct slvl_board), GFP_KERNEL);
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if(!b)
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goto fail3;
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memset(b, 0, sizeof(*b));
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if (!(b->dev[0]= slvl_alloc(iobase, irq)))
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goto fail2;
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b->dev[0]->chan = &b->board.chanA;
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b->dev[0]->channel = 0;
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if (!(b->dev[1] = slvl_alloc(iobase, irq)))
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goto fail1_0;
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b->dev[1]->chan = &b->board.chanB;
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b->dev[1]->channel = 1;
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dev = &b->board;
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/*
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* Stuff in the I/O addressing
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*/
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dev->active = 0;
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b->iobase = iobase;
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/*
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* Select 8530 delays for the old board
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*/
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if(slow)
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iobase |= Z8530_PORT_SLEEP;
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dev->chanA.ctrlio=iobase+1;
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dev->chanA.dataio=iobase;
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dev->chanB.ctrlio=iobase+3;
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dev->chanB.dataio=iobase+2;
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dev->chanA.irqs=&z8530_nop;
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dev->chanB.irqs=&z8530_nop;
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/*
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* Assert DTR enable DMA
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*/
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outb(3|(1<<7), b->iobase+4);
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/* We want a fast IRQ for this device. Actually we'd like an even faster
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IRQ ;) - This is one driver RtLinux is made for */
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if(request_irq(irq, &z8530_interrupt, SA_INTERRUPT, "SeaLevel", dev)<0)
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{
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printk(KERN_WARNING "sealevel: IRQ %d already in use.\n", irq);
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goto fail1_1;
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}
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dev->irq=irq;
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dev->chanA.private=&b->dev[0];
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dev->chanB.private=&b->dev[1];
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dev->chanA.netdevice=b->dev[0]->pppdev.dev;
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dev->chanB.netdevice=b->dev[1]->pppdev.dev;
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dev->chanA.dev=dev;
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dev->chanB.dev=dev;
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dev->chanA.txdma=3;
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dev->chanA.rxdma=1;
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if(request_dma(dev->chanA.txdma, "SeaLevel (TX)")!=0)
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goto fail;
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if(request_dma(dev->chanA.rxdma, "SeaLevel (RX)")!=0)
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goto dmafail;
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disable_irq(irq);
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/*
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* Begin normal initialise
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*/
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if(z8530_init(dev)!=0)
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{
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printk(KERN_ERR "Z8530 series device not found.\n");
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enable_irq(irq);
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goto dmafail2;
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}
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if(dev->type==Z85C30)
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{
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z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
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z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream);
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}
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else
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{
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z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
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z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream_85230);
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}
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/*
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* Now we can take the IRQ
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*/
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enable_irq(irq);
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if (register_netdev(b->dev[0]->pppdev.dev))
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goto dmafail2;
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if (register_netdev(b->dev[1]->pppdev.dev))
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goto fail_unit;
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z8530_describe(dev, "I/O", iobase);
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dev->active=1;
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return b;
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fail_unit:
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unregister_netdev(b->dev[0]->pppdev.dev);
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dmafail2:
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free_dma(dev->chanA.rxdma);
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dmafail:
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free_dma(dev->chanA.txdma);
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fail:
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free_irq(irq, dev);
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fail1_1:
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free_netdev(b->dev[1]->pppdev.dev);
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fail1_0:
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free_netdev(b->dev[0]->pppdev.dev);
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fail2:
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kfree(b);
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fail3:
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release_region(iobase,8);
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return NULL;
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}
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static void __exit slvl_shutdown(struct slvl_board *b)
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{
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int u;
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z8530_shutdown(&b->board);
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for(u=0; u<2; u++)
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{
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struct net_device *d = b->dev[u]->pppdev.dev;
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unregister_netdev(d);
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free_netdev(d);
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}
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free_irq(b->board.irq, &b->board);
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free_dma(b->board.chanA.rxdma);
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free_dma(b->board.chanA.txdma);
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/* DMA off on the card, drop DTR */
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outb(0, b->iobase);
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release_region(b->iobase, 8);
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kfree(b);
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}
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static int io=0x238;
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static int txdma=1;
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static int rxdma=3;
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static int irq=5;
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static int slow=0;
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module_param(io, int, 0);
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MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
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module_param(txdma, int, 0);
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MODULE_PARM_DESC(txdma, "Transmit DMA channel");
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module_param(rxdma, int, 0);
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MODULE_PARM_DESC(rxdma, "Receive DMA channel");
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module_param(irq, int, 0);
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MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card");
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module_param(slow, bool, 0);
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MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");
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MODULE_AUTHOR("Alan Cox");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Modular driver for the SeaLevel 4021");
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static struct slvl_board *slvl_unit;
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static int __init slvl_init_module(void)
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{
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#ifdef MODULE
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printk(KERN_INFO "SeaLevel Z85230 Synchronous Driver v 0.02.\n");
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printk(KERN_INFO "(c) Copyright 1998, Building Number Three Ltd.\n");
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#endif
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slvl_unit = slvl_init(io, irq, txdma, rxdma, slow);
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return slvl_unit ? 0 : -ENODEV;
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}
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static void __exit slvl_cleanup_module(void)
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{
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if(slvl_unit)
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slvl_shutdown(slvl_unit);
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}
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module_init(slvl_init_module);
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module_exit(slvl_cleanup_module);
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