]>
Commit | Line | Data |
---|---|---|
9cd7b148 MJ |
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/module.h> | |
20 | #include <asm/natfeat.h> | |
21 | #include <asm/virtconvert.h> | |
22 | ||
23 | enum { | |
24 | GET_VERSION = 0,/* no parameters, return NFAPI_VERSION in d0 */ | |
25 | XIF_INTLEVEL, /* no parameters, return Interrupt Level in d0 */ | |
26 | XIF_IRQ, /* acknowledge interrupt from host */ | |
27 | XIF_START, /* (ethX), called on 'ifup', start receiver thread */ | |
28 | XIF_STOP, /* (ethX), called on 'ifdown', stop the thread */ | |
29 | XIF_READLENGTH, /* (ethX), return size of network data block to read */ | |
30 | XIF_READBLOCK, /* (ethX, buffer, size), read block of network data */ | |
31 | XIF_WRITEBLOCK, /* (ethX, buffer, size), write block of network data */ | |
32 | XIF_GET_MAC, /* (ethX, buffer, size), return MAC HW addr in buffer */ | |
33 | XIF_GET_IPHOST, /* (ethX, buffer, size), return IP address of host */ | |
34 | XIF_GET_IPATARI,/* (ethX, buffer, size), return IP address of atari */ | |
35 | XIF_GET_NETMASK /* (ethX, buffer, size), return IP netmask */ | |
36 | }; | |
37 | ||
38 | #define MAX_UNIT 8 | |
39 | ||
40 | /* These identify the driver base version and may not be removed. */ | |
41 | static const char version[] __devinitdata = | |
42 | KERN_INFO KBUILD_MODNAME ".c:v" DRV_VERSION " " DRV_RELDATE | |
43 | " S.Opichal, M.Jurik, P.Stehlik\n" | |
44 | KERN_INFO " http://aranym.org/\n"; | |
45 | ||
46 | MODULE_AUTHOR("Milan Jurik"); | |
47 | MODULE_DESCRIPTION("Atari NFeth driver"); | |
48 | MODULE_LICENSE("GPL"); | |
49 | /* | |
50 | MODULE_PARM(nfeth_debug, "i"); | |
51 | MODULE_PARM_DESC(nfeth_debug, "nfeth_debug level (1-2)"); | |
52 | */ | |
53 | ||
54 | ||
55 | static long nfEtherID; | |
56 | static int nfEtherIRQ; | |
57 | ||
58 | struct nfeth_private { | |
59 | int ethX; | |
60 | }; | |
61 | ||
62 | static struct net_device *nfeth_dev[MAX_UNIT]; | |
63 | ||
64 | static int nfeth_open(struct net_device *dev) | |
65 | { | |
66 | struct nfeth_private *priv = netdev_priv(dev); | |
67 | int res; | |
68 | ||
69 | res = nf_call(nfEtherID + XIF_START, priv->ethX); | |
70 | netdev_dbg(dev, "%s: %d\n", __func__, res); | |
71 | ||
72 | /* Ready for data */ | |
73 | netif_start_queue(dev); | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
78 | static int nfeth_stop(struct net_device *dev) | |
79 | { | |
80 | struct nfeth_private *priv = netdev_priv(dev); | |
81 | ||
82 | /* No more data */ | |
83 | netif_stop_queue(dev); | |
84 | ||
85 | nf_call(nfEtherID + XIF_STOP, priv->ethX); | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | /* | |
91 | * Read a packet out of the adapter and pass it to the upper layers | |
92 | */ | |
93 | static inline void recv_packet(struct net_device *dev) | |
94 | { | |
95 | struct nfeth_private *priv = netdev_priv(dev); | |
96 | unsigned short pktlen; | |
97 | struct sk_buff *skb; | |
98 | ||
99 | /* read packet length (excluding 32 bit crc) */ | |
100 | pktlen = nf_call(nfEtherID + XIF_READLENGTH, priv->ethX); | |
101 | ||
102 | netdev_dbg(dev, "%s: %u\n", __func__, pktlen); | |
103 | ||
104 | if (!pktlen) { | |
105 | netdev_dbg(dev, "%s: pktlen == 0\n", __func__); | |
106 | dev->stats.rx_errors++; | |
107 | return; | |
108 | } | |
109 | ||
110 | skb = dev_alloc_skb(pktlen + 2); | |
111 | if (!skb) { | |
112 | netdev_dbg(dev, "%s: out of mem (buf_alloc failed)\n", | |
113 | __func__); | |
114 | dev->stats.rx_dropped++; | |
115 | return; | |
116 | } | |
117 | ||
118 | skb->dev = dev; | |
119 | skb_reserve(skb, 2); /* 16 Byte align */ | |
120 | skb_put(skb, pktlen); /* make room */ | |
121 | nf_call(nfEtherID + XIF_READBLOCK, priv->ethX, virt_to_phys(skb->data), | |
122 | pktlen); | |
123 | ||
124 | skb->protocol = eth_type_trans(skb, dev); | |
125 | netif_rx(skb); | |
126 | dev->last_rx = jiffies; | |
127 | dev->stats.rx_packets++; | |
128 | dev->stats.rx_bytes += pktlen; | |
129 | ||
130 | /* and enqueue packet */ | |
131 | return; | |
132 | } | |
133 | ||
134 | static irqreturn_t nfeth_interrupt(int irq, void *dev_id) | |
135 | { | |
136 | int i, m, mask; | |
137 | ||
138 | mask = nf_call(nfEtherID + XIF_IRQ, 0); | |
139 | for (i = 0, m = 1; i < MAX_UNIT; m <<= 1, i++) { | |
140 | if (mask & m && nfeth_dev[i]) { | |
141 | recv_packet(nfeth_dev[i]); | |
142 | nf_call(nfEtherID + XIF_IRQ, m); | |
143 | } | |
144 | } | |
145 | return IRQ_HANDLED; | |
146 | } | |
147 | ||
148 | static int nfeth_xmit(struct sk_buff *skb, struct net_device *dev) | |
149 | { | |
150 | unsigned int len; | |
151 | char *data, shortpkt[ETH_ZLEN]; | |
152 | struct nfeth_private *priv = netdev_priv(dev); | |
153 | ||
154 | data = skb->data; | |
155 | len = skb->len; | |
156 | if (len < ETH_ZLEN) { | |
157 | memset(shortpkt, 0, ETH_ZLEN); | |
158 | memcpy(shortpkt, data, len); | |
159 | data = shortpkt; | |
160 | len = ETH_ZLEN; | |
161 | } | |
162 | ||
163 | netdev_dbg(dev, "%s: send %u bytes\n", __func__, len); | |
164 | nf_call(nfEtherID + XIF_WRITEBLOCK, priv->ethX, virt_to_phys(data), | |
165 | len); | |
166 | ||
167 | dev->stats.tx_packets++; | |
168 | dev->stats.tx_bytes += len; | |
169 | ||
170 | dev_kfree_skb(skb); | |
171 | return 0; | |
172 | } | |
173 | ||
174 | static void nfeth_tx_timeout(struct net_device *dev) | |
175 | { | |
176 | dev->stats.tx_errors++; | |
177 | netif_wake_queue(dev); | |
178 | } | |
179 | ||
180 | static const struct net_device_ops nfeth_netdev_ops = { | |
181 | .ndo_open = nfeth_open, | |
182 | .ndo_stop = nfeth_stop, | |
183 | .ndo_start_xmit = nfeth_xmit, | |
184 | .ndo_tx_timeout = nfeth_tx_timeout, | |
185 | .ndo_validate_addr = eth_validate_addr, | |
186 | .ndo_change_mtu = eth_change_mtu, | |
187 | .ndo_set_mac_address = eth_mac_addr, | |
188 | }; | |
189 | ||
190 | static struct net_device * __init nfeth_probe(int unit) | |
191 | { | |
192 | struct net_device *dev; | |
193 | struct nfeth_private *priv; | |
194 | char mac[ETH_ALEN], host_ip[32], local_ip[32]; | |
195 | int err; | |
196 | ||
197 | if (!nf_call(nfEtherID + XIF_GET_MAC, unit, mac, ETH_ALEN)) | |
198 | return NULL; | |
199 | ||
200 | dev = alloc_etherdev(sizeof(struct nfeth_private)); | |
201 | if (!dev) | |
202 | return NULL; | |
203 | ||
204 | dev->irq = nfEtherIRQ; | |
205 | dev->netdev_ops = &nfeth_netdev_ops; | |
206 | ||
207 | dev->flags |= NETIF_F_NO_CSUM; | |
208 | memcpy(dev->dev_addr, mac, ETH_ALEN); | |
209 | ||
210 | priv = netdev_priv(dev); | |
211 | priv->ethX = unit; | |
212 | ||
213 | err = register_netdev(dev); | |
214 | if (err) { | |
215 | free_netdev(dev); | |
216 | return NULL; | |
217 | } | |
218 | ||
219 | nf_call(nfEtherID + XIF_GET_IPHOST, unit, | |
220 | host_ip, sizeof(host_ip)); | |
221 | nf_call(nfEtherID + XIF_GET_IPATARI, unit, | |
222 | local_ip, sizeof(local_ip)); | |
223 | ||
224 | netdev_info(dev, KBUILD_MODNAME " addr:%s (%s) HWaddr:%pM\n", host_ip, | |
225 | local_ip, mac); | |
226 | ||
227 | return dev; | |
228 | } | |
229 | ||
230 | static int __init nfeth_init(void) | |
231 | { | |
232 | long ver; | |
233 | int error, i; | |
234 | ||
235 | nfEtherID = nf_get_id("ETHERNET"); | |
236 | if (!nfEtherID) | |
237 | return -ENODEV; | |
238 | ||
239 | ver = nf_call(nfEtherID + GET_VERSION); | |
240 | pr_info("API %lu\n", ver); | |
241 | ||
242 | nfEtherIRQ = nf_call(nfEtherID + XIF_INTLEVEL); | |
243 | error = request_irq(nfEtherIRQ, nfeth_interrupt, IRQF_SHARED, | |
244 | "eth emu", nfeth_interrupt); | |
245 | if (error) { | |
246 | pr_err("request for irq %d failed %d", nfEtherIRQ, error); | |
247 | return error; | |
248 | } | |
249 | ||
250 | for (i = 0; i < MAX_UNIT; i++) | |
251 | nfeth_dev[i] = nfeth_probe(i); | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | static void __exit nfeth_cleanup(void) | |
257 | { | |
258 | int i; | |
259 | ||
260 | for (i = 0; i < MAX_UNIT; i++) { | |
261 | if (nfeth_dev[i]) { | |
262 | unregister_netdev(nfeth_dev[0]); | |
263 | free_netdev(nfeth_dev[0]); | |
264 | } | |
265 | } | |
266 | free_irq(nfEtherIRQ, nfeth_interrupt); | |
267 | } | |
268 | ||
269 | module_init(nfeth_init); | |
270 | module_exit(nfeth_cleanup); |