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/*
* atari_nfeth.c - ARAnyM ethernet card driver for GNU/Linux
*
* Copyright (c) 2005 Milan Jurik, Petr Stehlik of ARAnyM dev team
*
* Based on ARAnyM driver for FreeMiNT written by Standa Opichal
*
* This software may be used and distributed according to the terms of
* the GNU General Public License (GPL), incorporated herein by reference.
*/
#define DRV_VERSION "0.3"
#define DRV_RELDATE "10/12/2005"
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <asm/natfeat.h>
#include <asm/virtconvert.h>
enum {
GET_VERSION = 0,/* no parameters, return NFAPI_VERSION in d0 */
XIF_INTLEVEL, /* no parameters, return Interrupt Level in d0 */
XIF_IRQ, /* acknowledge interrupt from host */
XIF_START, /* (ethX), called on 'ifup', start receiver thread */
XIF_STOP, /* (ethX), called on 'ifdown', stop the thread */
XIF_READLENGTH, /* (ethX), return size of network data block to read */
XIF_READBLOCK, /* (ethX, buffer, size), read block of network data */
XIF_WRITEBLOCK, /* (ethX, buffer, size), write block of network data */
XIF_GET_MAC, /* (ethX, buffer, size), return MAC HW addr in buffer */
XIF_GET_IPHOST, /* (ethX, buffer, size), return IP address of host */
XIF_GET_IPATARI,/* (ethX, buffer, size), return IP address of atari */
XIF_GET_NETMASK /* (ethX, buffer, size), return IP netmask */
};
#define MAX_UNIT 8
/* These identify the driver base version and may not be removed. */
static const char version[] =
KERN_INFO KBUILD_MODNAME ".c:v" DRV_VERSION " " DRV_RELDATE
" S.Opichal, M.Jurik, P.Stehlik\n"
KERN_INFO " http://aranym.org/\n";
MODULE_AUTHOR("Milan Jurik");
MODULE_DESCRIPTION("Atari NFeth driver");
MODULE_LICENSE("GPL");
static long nfEtherID;
static int nfEtherIRQ;
struct nfeth_private {
int ethX;
};
static struct net_device *nfeth_dev[MAX_UNIT];
static int nfeth_open(struct net_device *dev)
{
struct nfeth_private *priv = netdev_priv(dev);
int res;
res = nf_call(nfEtherID + XIF_START, priv->ethX);
netdev_dbg(dev, "%s: %d\n", __func__, res);
/* Ready for data */
netif_start_queue(dev);
return 0;
}
static int nfeth_stop(struct net_device *dev)
{
struct nfeth_private *priv = netdev_priv(dev);
/* No more data */
netif_stop_queue(dev);
nf_call(nfEtherID + XIF_STOP, priv->ethX);
return 0;
}
/*
* Read a packet out of the adapter and pass it to the upper layers
*/
static inline void recv_packet(struct net_device *dev)
{
struct nfeth_private *priv = netdev_priv(dev);
unsigned short pktlen;
struct sk_buff *skb;
/* read packet length (excluding 32 bit crc) */
pktlen = nf_call(nfEtherID + XIF_READLENGTH, priv->ethX);
netdev_dbg(dev, "%s: %u\n", __func__, pktlen);
if (!pktlen) {
netdev_dbg(dev, "%s: pktlen == 0\n", __func__);
dev->stats.rx_errors++;
return;
}
skb = dev_alloc_skb(pktlen + 2);
if (!skb) {
netdev_dbg(dev, "%s: out of mem (buf_alloc failed)\n",
__func__);
dev->stats.rx_dropped++;
return;
}
skb->dev = dev;
skb_reserve(skb, 2); /* 16 Byte align */
skb_put(skb, pktlen); /* make room */
nf_call(nfEtherID + XIF_READBLOCK, priv->ethX, virt_to_phys(skb->data),
pktlen);
skb->protocol = eth_type_trans(skb, dev);
netif_rx(skb);
dev->stats.rx_packets++;
dev->stats.rx_bytes += pktlen;
/* and enqueue packet */
return;
}
static irqreturn_t nfeth_interrupt(int irq, void *dev_id)
{
int i, m, mask;
mask = nf_call(nfEtherID + XIF_IRQ, 0);
for (i = 0, m = 1; i < MAX_UNIT; m <<= 1, i++) {
if (mask & m && nfeth_dev[i]) {
recv_packet(nfeth_dev[i]);
nf_call(nfEtherID + XIF_IRQ, m);
}
}
return IRQ_HANDLED;
}
static int nfeth_xmit(struct sk_buff *skb, struct net_device *dev)
{
unsigned int len;
char *data, shortpkt[ETH_ZLEN];
struct nfeth_private *priv = netdev_priv(dev);
data = skb->data;
len = skb->len;
if (len < ETH_ZLEN) {
memset(shortpkt, 0, ETH_ZLEN);
memcpy(shortpkt, data, len);
data = shortpkt;
len = ETH_ZLEN;
}
netdev_dbg(dev, "%s: send %u bytes\n", __func__, len);
nf_call(nfEtherID + XIF_WRITEBLOCK, priv->ethX, virt_to_phys(data),
len);
dev->stats.tx_packets++;
dev->stats.tx_bytes += len;
dev_kfree_skb(skb);
return 0;
}
static void nfeth_tx_timeout(struct net_device *dev, unsigned int txqueue)
{
dev->stats.tx_errors++;
netif_wake_queue(dev);
}
static const struct net_device_ops nfeth_netdev_ops = {
.ndo_open = nfeth_open,
.ndo_stop = nfeth_stop,
.ndo_start_xmit = nfeth_xmit,
.ndo_tx_timeout = nfeth_tx_timeout,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = eth_mac_addr,
};
static struct net_device * __init nfeth_probe(int unit)
{
struct net_device *dev;
struct nfeth_private *priv;
char mac[ETH_ALEN], host_ip[32], local_ip[32];
int err;
if (!nf_call(nfEtherID + XIF_GET_MAC, unit, virt_to_phys(mac),
ETH_ALEN))
return NULL;
dev = alloc_etherdev(sizeof(struct nfeth_private));
if (!dev)
return NULL;
dev->irq = nfEtherIRQ;
dev->netdev_ops = &nfeth_netdev_ops;
memcpy(dev->dev_addr, mac, ETH_ALEN);
priv = netdev_priv(dev);
priv->ethX = unit;
err = register_netdev(dev);
if (err) {
free_netdev(dev);
return NULL;
}
nf_call(nfEtherID + XIF_GET_IPHOST, unit,
virt_to_phys(host_ip), sizeof(host_ip));
nf_call(nfEtherID + XIF_GET_IPATARI, unit,
virt_to_phys(local_ip), sizeof(local_ip));
netdev_info(dev, KBUILD_MODNAME " addr:%s (%s) HWaddr:%pM\n", host_ip,
local_ip, mac);
return dev;
}
static int __init nfeth_init(void)
{
long ver;
int error, i;
nfEtherID = nf_get_id("ETHERNET");
if (!nfEtherID)
return -ENODEV;
ver = nf_call(nfEtherID + GET_VERSION);
pr_info("API %lu\n", ver);
nfEtherIRQ = nf_call(nfEtherID + XIF_INTLEVEL);
error = request_irq(nfEtherIRQ, nfeth_interrupt, IRQF_SHARED,
"eth emu", nfeth_interrupt);
if (error) {
pr_err("request for irq %d failed %d", nfEtherIRQ, error);
return error;
}
for (i = 0; i < MAX_UNIT; i++)
nfeth_dev[i] = nfeth_probe(i);
return 0;
}
static void __exit nfeth_cleanup(void)
{
int i;
for (i = 0; i < MAX_UNIT; i++) {
if (nfeth_dev[i]) {
unregister_netdev(nfeth_dev[i]);
free_netdev(nfeth_dev[i]);
}
}
free_irq(nfEtherIRQ, nfeth_interrupt);
}
module_init(nfeth_init);
module_exit(nfeth_cleanup);
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