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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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55490050df
Pointers passed to ARAnyM NatFeat calls should be physical addresses, not virtual addresses. This worked before because on Atari, physical and virtual kernel addresses are the same, as long as normal kernel memory is concerned. Correct the few remaining places where virtual addresses were used. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
272 lines
6.3 KiB
C
272 lines
6.3 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->last_rx = jiffies;
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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_change_mtu = eth_change_mtu,
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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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