| /* |
| * 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/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[] __devinitdata = |
| 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"); |
| /* |
| MODULE_PARM(nfeth_debug, "i"); |
| MODULE_PARM_DESC(nfeth_debug, "nfeth_debug level (1-2)"); |
| */ |
| |
| |
| 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->last_rx = jiffies; |
| 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) |
| { |
| 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_change_mtu = eth_change_mtu, |
| .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, 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; |
| |
| dev->flags |= NETIF_F_NO_CSUM; |
| 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, |
| host_ip, sizeof(host_ip)); |
| nf_call(nfEtherID + XIF_GET_IPATARI, unit, |
| 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[0]); |
| free_netdev(nfeth_dev[0]); |
| } |
| } |
| free_irq(nfEtherIRQ, nfeth_interrupt); |
| } |
| |
| module_init(nfeth_init); |
| module_exit(nfeth_cleanup); |