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