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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"); | |
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 | ||
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 | ||
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 | */ | |
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
55490050 GU |
198 | if (!nf_call(nfEtherID + XIF_GET_MAC, unit, virt_to_phys(mac), |
199 | ETH_ALEN)) | |
9cd7b148 MJ |
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 | ||
9cd7b148 MJ |
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, | |
55490050 | 221 | virt_to_phys(host_ip), sizeof(host_ip)); |
9cd7b148 | 222 | nf_call(nfEtherID + XIF_GET_IPATARI, unit, |
55490050 | 223 | virt_to_phys(local_ip), sizeof(local_ip)); |
9cd7b148 MJ |
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 | ||
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 | ||
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[0]); | |
264 | free_netdev(nfeth_dev[0]); | |
265 | } | |
266 | } | |
267 | free_irq(nfEtherIRQ, nfeth_interrupt); | |
268 | } | |
269 | ||
270 | module_init(nfeth_init); | |
271 | module_exit(nfeth_cleanup); |