419 lines
8.1 KiB
C
419 lines
8.1 KiB
C
/*
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* Comtrol SV11 card driver
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*
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* This is a slightly odd Z85230 synchronous driver. All you need to
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* know basically is
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*
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* Its a genuine Z85230
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*
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* It supports DMA using two DMA channels in SYNC mode. The driver doesn't
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* use these facilities
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*
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* The control port is at io+1, the data at io+3 and turning off the DMA
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* is done by writing 0 to io+4
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*
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* The hardware does the bus handling to avoid the need for delays between
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* touching control registers.
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*
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* Port B isnt wired (why - beats me)
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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 <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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static int dma;
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struct sv11_device
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{
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void *if_ptr; /* General purpose pointer (used by SPPP) */
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struct z8530_dev sync;
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struct ppp_device netdev;
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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 hostess_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=__constant_htons(ETH_P_WAN_PPP);
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skb_reset_mac_header(skb);
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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 hostess_open(struct net_device *d)
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{
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struct sv11_device *sv11=d->ml_priv;
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int err = -1;
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/*
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* Link layer up
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*/
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switch(dma)
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{
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case 0:
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err=z8530_sync_open(d, &sv11->sync.chanA);
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break;
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case 1:
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err=z8530_sync_dma_open(d, &sv11->sync.chanA);
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break;
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case 2:
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err=z8530_sync_txdma_open(d, &sv11->sync.chanA);
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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(dma)
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{
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case 0:
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z8530_sync_close(d, &sv11->sync.chanA);
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break;
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case 1:
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z8530_sync_dma_close(d, &sv11->sync.chanA);
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break;
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case 2:
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z8530_sync_txdma_close(d, &sv11->sync.chanA);
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break;
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}
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return err;
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}
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sv11->sync.chanA.rx_function=hostess_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 hostess_close(struct net_device *d)
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{
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struct sv11_device *sv11=d->ml_priv;
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/*
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* Discard new frames
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*/
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sv11->sync.chanA.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(dma)
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{
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case 0:
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z8530_sync_close(d, &sv11->sync.chanA);
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break;
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case 1:
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z8530_sync_dma_close(d, &sv11->sync.chanA);
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break;
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case 2:
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z8530_sync_txdma_close(d, &sv11->sync.chanA);
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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 hostess_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
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{
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/* struct sv11_device *sv11=d->ml_priv;
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z8530_ioctl(d,&sv11->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 *hostess_get_stats(struct net_device *d)
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{
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struct sv11_device *sv11=d->ml_priv;
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if(sv11)
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return z8530_get_stats(&sv11->sync.chanA);
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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 hostess_queue_xmit(struct sk_buff *skb, struct net_device *d)
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{
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struct sv11_device *sv11=d->ml_priv;
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return z8530_queue_xmit(&sv11->sync.chanA, skb);
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}
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static int hostess_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 hostess_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 = hostess_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 void sv11_setup(struct net_device *dev)
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{
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dev->open = hostess_open;
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dev->stop = hostess_close;
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dev->hard_start_xmit = hostess_queue_xmit;
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dev->get_stats = hostess_get_stats;
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dev->do_ioctl = hostess_ioctl;
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dev->neigh_setup = hostess_neigh_setup_dev;
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}
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/*
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* Description block for a Comtrol Hostess SV11 card
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*/
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static struct sv11_device *sv11_init(int iobase, int irq)
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{
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struct z8530_dev *dev;
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struct sv11_device *sv;
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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, "Comtrol SV11"))
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{
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printk(KERN_WARNING "hostess: I/O 0x%X already in use.\n", iobase);
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return NULL;
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}
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sv = kzalloc(sizeof(struct sv11_device), GFP_KERNEL);
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if(!sv)
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goto fail3;
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sv->if_ptr=&sv->netdev;
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sv->netdev.dev = alloc_netdev(0, "hdlc%d", sv11_setup);
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if(!sv->netdev.dev)
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goto fail2;
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dev=&sv->sync;
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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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dev->chanA.ctrlio=iobase+1;
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dev->chanA.dataio=iobase+3;
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dev->chanB.ctrlio=-1;
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dev->chanB.dataio=-1;
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dev->chanA.irqs=&z8530_nop;
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dev->chanB.irqs=&z8530_nop;
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outb(0, iobase+4); /* DMA off */
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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, IRQF_DISABLED, "Hostess SV11", dev)<0)
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{
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printk(KERN_WARNING "hostess: IRQ %d already in use.\n", irq);
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goto fail1;
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}
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dev->irq=irq;
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dev->chanA.private=sv;
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dev->chanA.netdevice=sv->netdev.dev;
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dev->chanA.dev=dev;
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dev->chanB.dev=dev;
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if(dma)
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{
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/*
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* You can have DMA off or 1 and 3 thats the lot
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* on the Comtrol.
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*/
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dev->chanA.txdma=3;
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dev->chanA.rxdma=1;
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outb(0x03|0x08, iobase+4); /* DMA on */
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if(request_dma(dev->chanA.txdma, "Hostess SV/11 (TX)")!=0)
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goto fail;
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if(dma==1)
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{
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if(request_dma(dev->chanA.rxdma, "Hostess SV/11 (RX)")!=0)
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goto dmafail;
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}
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}
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/* Kill our private IRQ line the hostess can end up chattering
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until the configuration is set */
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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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z8530_channel_load(&dev->chanB, z8530_dead_port);
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if(dev->type==Z85C30)
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z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
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else
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z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
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enable_irq(irq);
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/*
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* Now we can take the IRQ
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*/
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if(dev_alloc_name(dev->chanA.netdevice,"hdlc%d")>=0)
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{
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struct net_device *d=dev->chanA.netdevice;
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/*
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* Initialise the PPP components
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*/
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d->ml_priv = sv;
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sppp_attach(&sv->netdev);
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/*
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* Local fields
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*/
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d->base_addr = iobase;
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d->irq = irq;
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if(register_netdev(d))
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{
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printk(KERN_ERR "%s: unable to register device.\n",
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d->name);
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sppp_detach(d);
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goto dmafail2;
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}
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z8530_describe(dev, "I/O", iobase);
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dev->active=1;
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return sv;
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}
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dmafail2:
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if(dma==1)
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free_dma(dev->chanA.rxdma);
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dmafail:
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if(dma)
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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:
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free_netdev(sv->netdev.dev);
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fail2:
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kfree(sv);
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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 sv11_shutdown(struct sv11_device *dev)
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{
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sppp_detach(dev->netdev.dev);
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unregister_netdev(dev->netdev.dev);
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z8530_shutdown(&dev->sync);
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free_irq(dev->sync.irq, dev);
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if(dma)
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{
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if(dma==1)
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free_dma(dev->sync.chanA.rxdma);
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free_dma(dev->sync.chanA.txdma);
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}
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release_region(dev->sync.chanA.ctrlio-1, 8);
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free_netdev(dev->netdev.dev);
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kfree(dev);
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}
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#ifdef MODULE
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static int io=0x200;
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static int irq=9;
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module_param(io, int, 0);
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MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
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module_param(dma, int, 0);
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MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
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module_param(irq, int, 0);
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MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");
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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 Comtrol Hostess SV11");
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static struct sv11_device *sv11_unit;
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int init_module(void)
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{
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printk(KERN_INFO "SV-11 Z85230 Synchronous Driver v 0.03.\n");
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printk(KERN_INFO "(c) Copyright 2001, Red Hat Inc.\n");
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if((sv11_unit=sv11_init(io,irq))==NULL)
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return -ENODEV;
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return 0;
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}
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void cleanup_module(void)
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{
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if(sv11_unit)
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sv11_shutdown(sv11_unit);
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}
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#endif
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