diff options
Diffstat (limited to 'arch/m68k/emu/nfeth.c')
| -rw-r--r-- | arch/m68k/emu/nfeth.c | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/arch/m68k/emu/nfeth.c b/arch/m68k/emu/nfeth.c new file mode 100644 index 000000000..1a5d1e8eb --- /dev/null +++ b/arch/m68k/emu/nfeth.c @@ -0,0 +1,265 @@ +/* + * 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; + + eth_hw_addr_set(dev, mac); + + 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); |