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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> | |
ac752277 | 19 | #include <linux/interrupt.h> |
9cd7b148 MJ |
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. */ | |
b881bc46 | 42 | static const char version[] = |
9cd7b148 MJ |
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"); | |
9cd7b148 MJ |
50 | |
51 | ||
52 | static long nfEtherID; | |
53 | static int nfEtherIRQ; | |
54 | ||
55 | struct nfeth_private { | |
56 | int ethX; | |
57 | }; | |
58 | ||
59 | static struct net_device *nfeth_dev[MAX_UNIT]; | |
60 | ||
61 | static int nfeth_open(struct net_device *dev) | |
62 | { | |
63 | struct nfeth_private *priv = netdev_priv(dev); | |
64 | int res; | |
65 | ||
66 | res = nf_call(nfEtherID + XIF_START, priv->ethX); | |
67 | netdev_dbg(dev, "%s: %d\n", __func__, res); | |
68 | ||
69 | /* Ready for data */ | |
70 | netif_start_queue(dev); | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | static int nfeth_stop(struct net_device *dev) | |
76 | { | |
77 | struct nfeth_private *priv = netdev_priv(dev); | |
78 | ||
79 | /* No more data */ | |
80 | netif_stop_queue(dev); | |
81 | ||
82 | nf_call(nfEtherID + XIF_STOP, priv->ethX); | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
87 | /* | |
88 | * Read a packet out of the adapter and pass it to the upper layers | |
89 | */ | |
90 | static inline void recv_packet(struct net_device *dev) | |
91 | { | |
92 | struct nfeth_private *priv = netdev_priv(dev); | |
93 | unsigned short pktlen; | |
94 | struct sk_buff *skb; | |
95 | ||
96 | /* read packet length (excluding 32 bit crc) */ | |
97 | pktlen = nf_call(nfEtherID + XIF_READLENGTH, priv->ethX); | |
98 | ||
99 | netdev_dbg(dev, "%s: %u\n", __func__, pktlen); | |
100 | ||
101 | if (!pktlen) { | |
102 | netdev_dbg(dev, "%s: pktlen == 0\n", __func__); | |
103 | dev->stats.rx_errors++; | |
104 | return; | |
105 | } | |
106 | ||
107 | skb = dev_alloc_skb(pktlen + 2); | |
108 | if (!skb) { | |
109 | netdev_dbg(dev, "%s: out of mem (buf_alloc failed)\n", | |
110 | __func__); | |
111 | dev->stats.rx_dropped++; | |
112 | return; | |
113 | } | |
114 | ||
115 | skb->dev = dev; | |
116 | skb_reserve(skb, 2); /* 16 Byte align */ | |
117 | skb_put(skb, pktlen); /* make room */ | |
118 | nf_call(nfEtherID + XIF_READBLOCK, priv->ethX, virt_to_phys(skb->data), | |
119 | pktlen); | |
120 | ||
121 | skb->protocol = eth_type_trans(skb, dev); | |
122 | netif_rx(skb); | |
9cd7b148 MJ |
123 | dev->stats.rx_packets++; |
124 | dev->stats.rx_bytes += pktlen; | |
125 | ||
126 | /* and enqueue packet */ | |
127 | return; | |
128 | } | |
129 | ||
130 | static irqreturn_t nfeth_interrupt(int irq, void *dev_id) | |
131 | { | |
132 | int i, m, mask; | |
133 | ||
134 | mask = nf_call(nfEtherID + XIF_IRQ, 0); | |
135 | for (i = 0, m = 1; i < MAX_UNIT; m <<= 1, i++) { | |
136 | if (mask & m && nfeth_dev[i]) { | |
137 | recv_packet(nfeth_dev[i]); | |
138 | nf_call(nfEtherID + XIF_IRQ, m); | |
139 | } | |
140 | } | |
141 | return IRQ_HANDLED; | |
142 | } | |
143 | ||
144 | static int nfeth_xmit(struct sk_buff *skb, struct net_device *dev) | |
145 | { | |
146 | unsigned int len; | |
147 | char *data, shortpkt[ETH_ZLEN]; | |
148 | struct nfeth_private *priv = netdev_priv(dev); | |
149 | ||
150 | data = skb->data; | |
151 | len = skb->len; | |
152 | if (len < ETH_ZLEN) { | |
153 | memset(shortpkt, 0, ETH_ZLEN); | |
154 | memcpy(shortpkt, data, len); | |
155 | data = shortpkt; | |
156 | len = ETH_ZLEN; | |
157 | } | |
158 | ||
159 | netdev_dbg(dev, "%s: send %u bytes\n", __func__, len); | |
160 | nf_call(nfEtherID + XIF_WRITEBLOCK, priv->ethX, virt_to_phys(data), | |
161 | len); | |
162 | ||
163 | dev->stats.tx_packets++; | |
164 | dev->stats.tx_bytes += len; | |
165 | ||
166 | dev_kfree_skb(skb); | |
167 | return 0; | |
168 | } | |
169 | ||
0290bd29 | 170 | static void nfeth_tx_timeout(struct net_device *dev, unsigned int txqueue) |
9cd7b148 MJ |
171 | { |
172 | dev->stats.tx_errors++; | |
173 | netif_wake_queue(dev); | |
174 | } | |
175 | ||
176 | static const struct net_device_ops nfeth_netdev_ops = { | |
177 | .ndo_open = nfeth_open, | |
178 | .ndo_stop = nfeth_stop, | |
179 | .ndo_start_xmit = nfeth_xmit, | |
180 | .ndo_tx_timeout = nfeth_tx_timeout, | |
181 | .ndo_validate_addr = eth_validate_addr, | |
9cd7b148 MJ |
182 | .ndo_set_mac_address = eth_mac_addr, |
183 | }; | |
184 | ||
185 | static struct net_device * __init nfeth_probe(int unit) | |
186 | { | |
187 | struct net_device *dev; | |
188 | struct nfeth_private *priv; | |
189 | char mac[ETH_ALEN], host_ip[32], local_ip[32]; | |
190 | int err; | |
191 | ||
55490050 GU |
192 | if (!nf_call(nfEtherID + XIF_GET_MAC, unit, virt_to_phys(mac), |
193 | ETH_ALEN)) | |
9cd7b148 MJ |
194 | return NULL; |
195 | ||
196 | dev = alloc_etherdev(sizeof(struct nfeth_private)); | |
197 | if (!dev) | |
198 | return NULL; | |
199 | ||
200 | dev->irq = nfEtherIRQ; | |
201 | dev->netdev_ops = &nfeth_netdev_ops; | |
202 | ||
9cd7b148 MJ |
203 | memcpy(dev->dev_addr, mac, ETH_ALEN); |
204 | ||
205 | priv = netdev_priv(dev); | |
206 | priv->ethX = unit; | |
207 | ||
208 | err = register_netdev(dev); | |
209 | if (err) { | |
210 | free_netdev(dev); | |
211 | return NULL; | |
212 | } | |
213 | ||
214 | nf_call(nfEtherID + XIF_GET_IPHOST, unit, | |
55490050 | 215 | virt_to_phys(host_ip), sizeof(host_ip)); |
9cd7b148 | 216 | nf_call(nfEtherID + XIF_GET_IPATARI, unit, |
55490050 | 217 | virt_to_phys(local_ip), sizeof(local_ip)); |
9cd7b148 MJ |
218 | |
219 | netdev_info(dev, KBUILD_MODNAME " addr:%s (%s) HWaddr:%pM\n", host_ip, | |
220 | local_ip, mac); | |
221 | ||
222 | return dev; | |
223 | } | |
224 | ||
225 | static int __init nfeth_init(void) | |
226 | { | |
227 | long ver; | |
228 | int error, i; | |
229 | ||
230 | nfEtherID = nf_get_id("ETHERNET"); | |
231 | if (!nfEtherID) | |
232 | return -ENODEV; | |
233 | ||
234 | ver = nf_call(nfEtherID + GET_VERSION); | |
235 | pr_info("API %lu\n", ver); | |
236 | ||
237 | nfEtherIRQ = nf_call(nfEtherID + XIF_INTLEVEL); | |
238 | error = request_irq(nfEtherIRQ, nfeth_interrupt, IRQF_SHARED, | |
239 | "eth emu", nfeth_interrupt); | |
240 | if (error) { | |
241 | pr_err("request for irq %d failed %d", nfEtherIRQ, error); | |
242 | return error; | |
243 | } | |
244 | ||
245 | for (i = 0; i < MAX_UNIT; i++) | |
246 | nfeth_dev[i] = nfeth_probe(i); | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
251 | static void __exit nfeth_cleanup(void) | |
252 | { | |
253 | int i; | |
254 | ||
255 | for (i = 0; i < MAX_UNIT; i++) { | |
256 | if (nfeth_dev[i]) { | |
761608f5 PS |
257 | unregister_netdev(nfeth_dev[i]); |
258 | free_netdev(nfeth_dev[i]); | |
9cd7b148 MJ |
259 | } |
260 | } | |
261 | free_irq(nfEtherIRQ, nfeth_interrupt); | |
262 | } | |
263 | ||
264 | module_init(nfeth_init); | |
265 | module_exit(nfeth_cleanup); |