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linux-sg2042/drivers/net/wan/hostess_sv11.c

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/*
* Comtrol SV11 card driver
*
* This is a slightly odd Z85230 synchronous driver. All you need to
* know basically is
*
* Its a genuine Z85230
*
* It supports DMA using two DMA channels in SYNC mode. The driver doesn't
* use these facilities
*
* The control port is at io+1, the data at io+3 and turning off the DMA
* is done by writing 0 to io+4
*
* The hardware does the bus handling to avoid the need for delays between
* touching control registers.
*
* Port B isnt wired (why - beats me)
*/
#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 <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"
static int dma;
struct sv11_device
{
void *if_ptr; /* General purpose pointer (used by SPPP) */
struct z8530_dev sync;
struct ppp_device netdev;
};
/*
* Network driver support routines
*/
/*
* Frame receive. Simple for our card as we do sync ppp and there
* is no funny garbage involved
*/
static void hostess_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=__constant_htons(ETH_P_WAN_PPP);
skb_reset_mac_header(skb);
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 hostess_open(struct net_device *d)
{
struct sv11_device *sv11=d->priv;
int err = -1;
/*
* Link layer up
*/
switch(dma)
{
case 0:
err=z8530_sync_open(d, &sv11->sync.chanA);
break;
case 1:
err=z8530_sync_dma_open(d, &sv11->sync.chanA);
break;
case 2:
err=z8530_sync_txdma_open(d, &sv11->sync.chanA);
break;
}
if(err)
return err;
/*
* Begin PPP
*/
err=sppp_open(d);
if(err)
{
switch(dma)
{
case 0:
z8530_sync_close(d, &sv11->sync.chanA);
break;
case 1:
z8530_sync_dma_close(d, &sv11->sync.chanA);
break;
case 2:
z8530_sync_txdma_close(d, &sv11->sync.chanA);
break;
}
return err;
}
sv11->sync.chanA.rx_function=hostess_input;
/*
* Go go go
*/
netif_start_queue(d);
return 0;
}
static int hostess_close(struct net_device *d)
{
struct sv11_device *sv11=d->priv;
/*
* Discard new frames
*/
sv11->sync.chanA.rx_function=z8530_null_rx;
/*
* PPP off
*/
sppp_close(d);
/*
* Link layer down
*/
netif_stop_queue(d);
switch(dma)
{
case 0:
z8530_sync_close(d, &sv11->sync.chanA);
break;
case 1:
z8530_sync_dma_close(d, &sv11->sync.chanA);
break;
case 2:
z8530_sync_txdma_close(d, &sv11->sync.chanA);
break;
}
return 0;
}
static int hostess_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
{
/* struct sv11_device *sv11=d->priv;
z8530_ioctl(d,&sv11->sync.chanA,ifr,cmd) */
return sppp_do_ioctl(d, ifr,cmd);
}
static struct net_device_stats *hostess_get_stats(struct net_device *d)
{
struct sv11_device *sv11=d->priv;
if(sv11)
return z8530_get_stats(&sv11->sync.chanA);
else
return NULL;
}
/*
* Passed PPP frames, fire them downwind.
*/
static int hostess_queue_xmit(struct sk_buff *skb, struct net_device *d)
{
struct sv11_device *sv11=d->priv;
return z8530_queue_xmit(&sv11->sync.chanA, skb);
}
static int hostess_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 hostess_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
{
if (p->tbl->family == AF_INET) {
p->neigh_setup = hostess_neigh_setup;
p->ucast_probes = 0;
p->mcast_probes = 0;
}
return 0;
}
static void sv11_setup(struct net_device *dev)
{
dev->open = hostess_open;
dev->stop = hostess_close;
dev->hard_start_xmit = hostess_queue_xmit;
dev->get_stats = hostess_get_stats;
dev->do_ioctl = hostess_ioctl;
dev->neigh_setup = hostess_neigh_setup_dev;
}
/*
* Description block for a Comtrol Hostess SV11 card
*/
static struct sv11_device *sv11_init(int iobase, int irq)
{
struct z8530_dev *dev;
struct sv11_device *sv;
/*
* Get the needed I/O space
*/
if(!request_region(iobase, 8, "Comtrol SV11"))
{
printk(KERN_WARNING "hostess: I/O 0x%X already in use.\n", iobase);
return NULL;
}
sv = kmalloc(sizeof(struct sv11_device), GFP_KERNEL);
if(!sv)
goto fail3;
memset(sv, 0, sizeof(*sv));
sv->if_ptr=&sv->netdev;
sv->netdev.dev = alloc_netdev(0, "hdlc%d", sv11_setup);
if(!sv->netdev.dev)
goto fail2;
SET_MODULE_OWNER(sv->netdev.dev);
dev=&sv->sync;
/*
* Stuff in the I/O addressing
*/
dev->active = 0;
dev->chanA.ctrlio=iobase+1;
dev->chanA.dataio=iobase+3;
dev->chanB.ctrlio=-1;
dev->chanB.dataio=-1;
dev->chanA.irqs=&z8530_nop;
dev->chanB.irqs=&z8530_nop;
outb(0, iobase+4); /* DMA off */
/* We want a fast IRQ for this device. Actually we'd like an even faster
IRQ ;) - This is one driver RtLinux is made for */
if(request_irq(irq, &z8530_interrupt, IRQF_DISABLED, "Hostess SV11", dev)<0)
{
printk(KERN_WARNING "hostess: IRQ %d already in use.\n", irq);
goto fail1;
}
dev->irq=irq;
dev->chanA.private=sv;
dev->chanA.netdevice=sv->netdev.dev;
dev->chanA.dev=dev;
dev->chanB.dev=dev;
if(dma)
{
/*
* You can have DMA off or 1 and 3 thats the lot
* on the Comtrol.
*/
dev->chanA.txdma=3;
dev->chanA.rxdma=1;
outb(0x03|0x08, iobase+4); /* DMA on */
if(request_dma(dev->chanA.txdma, "Hostess SV/11 (TX)")!=0)
goto fail;
if(dma==1)
{
if(request_dma(dev->chanA.rxdma, "Hostess SV/11 (RX)")!=0)
goto dmafail;
}
}
/* Kill our private IRQ line the hostess can end up chattering
until the configuration is set */
disable_irq(irq);
/*
* Begin normal initialise
*/
if(z8530_init(dev)!=0)
{
printk(KERN_ERR "Z8530 series device not found.\n");
enable_irq(irq);
goto dmafail2;
}
z8530_channel_load(&dev->chanB, z8530_dead_port);
if(dev->type==Z85C30)
z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
else
z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
enable_irq(irq);
/*
* Now we can take the IRQ
*/
if(dev_alloc_name(dev->chanA.netdevice,"hdlc%d")>=0)
{
struct net_device *d=dev->chanA.netdevice;
/*
* Initialise the PPP components
*/
sppp_attach(&sv->netdev);
/*
* Local fields
*/
d->base_addr = iobase;
d->irq = irq;
d->priv = sv;
if(register_netdev(d))
{
printk(KERN_ERR "%s: unable to register device.\n",
d->name);
sppp_detach(d);
goto dmafail2;
}
z8530_describe(dev, "I/O", iobase);
dev->active=1;
return sv;
}
dmafail2:
if(dma==1)
free_dma(dev->chanA.rxdma);
dmafail:
if(dma)
free_dma(dev->chanA.txdma);
fail:
free_irq(irq, dev);
fail1:
free_netdev(sv->netdev.dev);
fail2:
kfree(sv);
fail3:
release_region(iobase,8);
return NULL;
}
static void sv11_shutdown(struct sv11_device *dev)
{
sppp_detach(dev->netdev.dev);
unregister_netdev(dev->netdev.dev);
z8530_shutdown(&dev->sync);
free_irq(dev->sync.irq, dev);
if(dma)
{
if(dma==1)
free_dma(dev->sync.chanA.rxdma);
free_dma(dev->sync.chanA.txdma);
}
release_region(dev->sync.chanA.ctrlio-1, 8);
free_netdev(dev->netdev.dev);
kfree(dev);
}
#ifdef MODULE
static int io=0x200;
static int irq=9;
module_param(io, int, 0);
MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
module_param(dma, int, 0);
MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
module_param(irq, int, 0);
MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");
MODULE_AUTHOR("Alan Cox");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");
static struct sv11_device *sv11_unit;
int init_module(void)
{
printk(KERN_INFO "SV-11 Z85230 Synchronous Driver v 0.03.\n");
printk(KERN_INFO "(c) Copyright 2001, Red Hat Inc.\n");
if((sv11_unit=sv11_init(io,irq))==NULL)
return -ENODEV;
return 0;
}
void cleanup_module(void)
{
if(sv11_unit)
sv11_shutdown(sv11_unit);
}
#endif
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