1 /*
2 * atari_nfeth.c - ARAnyM ethernet card driver for GNU/Linux
3 *
4 * Copyright (c) 2005 Milan Jurik, Petr Stehlik of ARAnyM dev team
5 *
6 * Based on ARAnyM driver for FreeMiNT written by Standa Opichal
7 *
8 * This software may be used and distributed according to the terms of
9 * the GNU General Public License (GPL), incorporated herein by reference.
10 */
11
12 #define DRV_VERSION "0.3"
13 #define DRV_RELDATE "10/12/2005"
14
15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16
17 #include <linux/netdevice.h>
18 #include <linux/etherdevice.h>
19 #include <linux/interrupt.h>
20 #include <linux/module.h>
21 #include <asm/natfeat.h>
22 #include <asm/virtconvert.h>
23
24 enum {
25 GET_VERSION = 0,/* no parameters, return NFAPI_VERSION in d0 */
26 XIF_INTLEVEL, /* no parameters, return Interrupt Level in d0 */
27 XIF_IRQ, /* acknowledge interrupt from host */
28 XIF_START, /* (ethX), called on 'ifup', start receiver thread */
29 XIF_STOP, /* (ethX), called on 'ifdown', stop the thread */
30 XIF_READLENGTH, /* (ethX), return size of network data block to read */
31 XIF_READBLOCK, /* (ethX, buffer, size), read block of network data */
32 XIF_WRITEBLOCK, /* (ethX, buffer, size), write block of network data */
33 XIF_GET_MAC, /* (ethX, buffer, size), return MAC HW addr in buffer */
34 XIF_GET_IPHOST, /* (ethX, buffer, size), return IP address of host */
35 XIF_GET_IPATARI,/* (ethX, buffer, size), return IP address of atari */
36 XIF_GET_NETMASK /* (ethX, buffer, size), return IP netmask */
37 };
38
39 #define MAX_UNIT 8
40
41 /* These identify the driver base version and may not be removed. */
42 static const char version[] =
43 KERN_INFO KBUILD_MODNAME ".c:v" DRV_VERSION " " DRV_RELDATE
44 " S.Opichal, M.Jurik, P.Stehlik\n"
45 KERN_INFO " http://aranym.org/\n";
46
47 MODULE_AUTHOR("Milan Jurik");
48 MODULE_DESCRIPTION("Atari NFeth driver");
49 MODULE_LICENSE("GPL");
50 /*
51 MODULE_PARM(nfeth_debug, "i");
52 MODULE_PARM_DESC(nfeth_debug, "nfeth_debug level (1-2)");
53 */
54
55
56 static long nfEtherID;
57 static int nfEtherIRQ;
58
59 struct nfeth_private {
60 int ethX;
61 };
62
63 static struct net_device *nfeth_dev[MAX_UNIT];
64
nfeth_open(struct net_device * dev)65 static int nfeth_open(struct net_device *dev)
66 {
67 struct nfeth_private *priv = netdev_priv(dev);
68 int res;
69
70 res = nf_call(nfEtherID + XIF_START, priv->ethX);
71 netdev_dbg(dev, "%s: %d\n", __func__, res);
72
73 /* Ready for data */
74 netif_start_queue(dev);
75
76 return 0;
77 }
78
nfeth_stop(struct net_device * dev)79 static int nfeth_stop(struct net_device *dev)
80 {
81 struct nfeth_private *priv = netdev_priv(dev);
82
83 /* No more data */
84 netif_stop_queue(dev);
85
86 nf_call(nfEtherID + XIF_STOP, priv->ethX);
87
88 return 0;
89 }
90
91 /*
92 * Read a packet out of the adapter and pass it to the upper layers
93 */
recv_packet(struct net_device * dev)94 static inline void recv_packet(struct net_device *dev)
95 {
96 struct nfeth_private *priv = netdev_priv(dev);
97 unsigned short pktlen;
98 struct sk_buff *skb;
99
100 /* read packet length (excluding 32 bit crc) */
101 pktlen = nf_call(nfEtherID + XIF_READLENGTH, priv->ethX);
102
103 netdev_dbg(dev, "%s: %u\n", __func__, pktlen);
104
105 if (!pktlen) {
106 netdev_dbg(dev, "%s: pktlen == 0\n", __func__);
107 dev->stats.rx_errors++;
108 return;
109 }
110
111 skb = dev_alloc_skb(pktlen + 2);
112 if (!skb) {
113 netdev_dbg(dev, "%s: out of mem (buf_alloc failed)\n",
114 __func__);
115 dev->stats.rx_dropped++;
116 return;
117 }
118
119 skb->dev = dev;
120 skb_reserve(skb, 2); /* 16 Byte align */
121 skb_put(skb, pktlen); /* make room */
122 nf_call(nfEtherID + XIF_READBLOCK, priv->ethX, virt_to_phys(skb->data),
123 pktlen);
124
125 skb->protocol = eth_type_trans(skb, dev);
126 netif_rx(skb);
127 dev->last_rx = jiffies;
128 dev->stats.rx_packets++;
129 dev->stats.rx_bytes += pktlen;
130
131 /* and enqueue packet */
132 return;
133 }
134
nfeth_interrupt(int irq,void * dev_id)135 static irqreturn_t nfeth_interrupt(int irq, void *dev_id)
136 {
137 int i, m, mask;
138
139 mask = nf_call(nfEtherID + XIF_IRQ, 0);
140 for (i = 0, m = 1; i < MAX_UNIT; m <<= 1, i++) {
141 if (mask & m && nfeth_dev[i]) {
142 recv_packet(nfeth_dev[i]);
143 nf_call(nfEtherID + XIF_IRQ, m);
144 }
145 }
146 return IRQ_HANDLED;
147 }
148
nfeth_xmit(struct sk_buff * skb,struct net_device * dev)149 static int nfeth_xmit(struct sk_buff *skb, struct net_device *dev)
150 {
151 unsigned int len;
152 char *data, shortpkt[ETH_ZLEN];
153 struct nfeth_private *priv = netdev_priv(dev);
154
155 data = skb->data;
156 len = skb->len;
157 if (len < ETH_ZLEN) {
158 memset(shortpkt, 0, ETH_ZLEN);
159 memcpy(shortpkt, data, len);
160 data = shortpkt;
161 len = ETH_ZLEN;
162 }
163
164 netdev_dbg(dev, "%s: send %u bytes\n", __func__, len);
165 nf_call(nfEtherID + XIF_WRITEBLOCK, priv->ethX, virt_to_phys(data),
166 len);
167
168 dev->stats.tx_packets++;
169 dev->stats.tx_bytes += len;
170
171 dev_kfree_skb(skb);
172 return 0;
173 }
174
nfeth_tx_timeout(struct net_device * dev)175 static void nfeth_tx_timeout(struct net_device *dev)
176 {
177 dev->stats.tx_errors++;
178 netif_wake_queue(dev);
179 }
180
181 static const struct net_device_ops nfeth_netdev_ops = {
182 .ndo_open = nfeth_open,
183 .ndo_stop = nfeth_stop,
184 .ndo_start_xmit = nfeth_xmit,
185 .ndo_tx_timeout = nfeth_tx_timeout,
186 .ndo_validate_addr = eth_validate_addr,
187 .ndo_change_mtu = eth_change_mtu,
188 .ndo_set_mac_address = eth_mac_addr,
189 };
190
nfeth_probe(int unit)191 static struct net_device * __init nfeth_probe(int unit)
192 {
193 struct net_device *dev;
194 struct nfeth_private *priv;
195 char mac[ETH_ALEN], host_ip[32], local_ip[32];
196 int err;
197
198 if (!nf_call(nfEtherID + XIF_GET_MAC, unit, virt_to_phys(mac),
199 ETH_ALEN))
200 return NULL;
201
202 dev = alloc_etherdev(sizeof(struct nfeth_private));
203 if (!dev)
204 return NULL;
205
206 dev->irq = nfEtherIRQ;
207 dev->netdev_ops = &nfeth_netdev_ops;
208
209 memcpy(dev->dev_addr, mac, ETH_ALEN);
210
211 priv = netdev_priv(dev);
212 priv->ethX = unit;
213
214 err = register_netdev(dev);
215 if (err) {
216 free_netdev(dev);
217 return NULL;
218 }
219
220 nf_call(nfEtherID + XIF_GET_IPHOST, unit,
221 virt_to_phys(host_ip), sizeof(host_ip));
222 nf_call(nfEtherID + XIF_GET_IPATARI, unit,
223 virt_to_phys(local_ip), sizeof(local_ip));
224
225 netdev_info(dev, KBUILD_MODNAME " addr:%s (%s) HWaddr:%pM\n", host_ip,
226 local_ip, mac);
227
228 return dev;
229 }
230
nfeth_init(void)231 static int __init nfeth_init(void)
232 {
233 long ver;
234 int error, i;
235
236 nfEtherID = nf_get_id("ETHERNET");
237 if (!nfEtherID)
238 return -ENODEV;
239
240 ver = nf_call(nfEtherID + GET_VERSION);
241 pr_info("API %lu\n", ver);
242
243 nfEtherIRQ = nf_call(nfEtherID + XIF_INTLEVEL);
244 error = request_irq(nfEtherIRQ, nfeth_interrupt, IRQF_SHARED,
245 "eth emu", nfeth_interrupt);
246 if (error) {
247 pr_err("request for irq %d failed %d", nfEtherIRQ, error);
248 return error;
249 }
250
251 for (i = 0; i < MAX_UNIT; i++)
252 nfeth_dev[i] = nfeth_probe(i);
253
254 return 0;
255 }
256
nfeth_cleanup(void)257 static void __exit nfeth_cleanup(void)
258 {
259 int i;
260
261 for (i = 0; i < MAX_UNIT; i++) {
262 if (nfeth_dev[i]) {
263 unregister_netdev(nfeth_dev[i]);
264 free_netdev(nfeth_dev[i]);
265 }
266 }
267 free_irq(nfEtherIRQ, nfeth_interrupt);
268 }
269
270 module_init(nfeth_init);
271 module_exit(nfeth_cleanup);
272