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dcbf8477 RB |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | */ | |
6 | ||
7 | #define DEBUG | |
8 | ||
9 | #include <linux/init.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/netdevice.h> | |
dcbf8477 | 13 | #include <linux/etherdevice.h> |
d052d1be | 14 | #include <linux/platform_device.h> |
dcbf8477 RB |
15 | #include <asm/io.h> |
16 | #include <asm/mips-boards/simint.h> | |
17 | ||
18 | #include "mipsnet.h" /* actual device IO mapping */ | |
19 | ||
20 | #define MIPSNET_VERSION "2005-06-20" | |
21 | ||
22 | #define mipsnet_reg_address(dev, field) (dev->base_addr + field_offset(field)) | |
23 | ||
dcbf8477 RB |
24 | static char mipsnet_string[] = "mipsnet"; |
25 | ||
26 | /* | |
27 | * Copy data from the MIPSNET rx data port | |
28 | */ | |
29 | static int ioiocpy_frommipsnet(struct net_device *dev, unsigned char *kdata, | |
30 | int len) | |
31 | { | |
32 | uint32_t available_len = inl(mipsnet_reg_address(dev, rxDataCount)); | |
33 | if (available_len < len) | |
34 | return -EFAULT; | |
35 | ||
36 | for (; len > 0; len--, kdata++) { | |
37 | *kdata = inb(mipsnet_reg_address(dev, rxDataBuffer)); | |
38 | } | |
39 | ||
40 | return inl(mipsnet_reg_address(dev, rxDataCount)); | |
41 | } | |
42 | ||
43 | static inline ssize_t mipsnet_put_todevice(struct net_device *dev, | |
44 | struct sk_buff *skb) | |
45 | { | |
46 | int count_to_go = skb->len; | |
47 | char *buf_ptr = skb->data; | |
dcbf8477 RB |
48 | |
49 | pr_debug("%s: %s(): telling MIPSNET txDataCount(%d)\n", | |
50 | dev->name, __FUNCTION__, skb->len); | |
51 | ||
52 | outl(skb->len, mipsnet_reg_address(dev, txDataCount)); | |
53 | ||
54 | pr_debug("%s: %s(): sending data to MIPSNET txDataBuffer(%d)\n", | |
55 | dev->name, __FUNCTION__, skb->len); | |
56 | ||
57 | for (; count_to_go; buf_ptr++, count_to_go--) { | |
58 | outb(*buf_ptr, mipsnet_reg_address(dev, txDataBuffer)); | |
59 | } | |
60 | ||
09f75cd7 JG |
61 | dev->stats.tx_packets++; |
62 | dev->stats.tx_bytes += skb->len; | |
dcbf8477 RB |
63 | |
64 | return skb->len; | |
65 | } | |
66 | ||
67 | static int mipsnet_xmit(struct sk_buff *skb, struct net_device *dev) | |
68 | { | |
69 | pr_debug("%s:%s(): transmitting %d bytes\n", | |
70 | dev->name, __FUNCTION__, skb->len); | |
71 | ||
72 | /* Only one packet at a time. Once TXDONE interrupt is serviced, the | |
73 | * queue will be restarted. | |
74 | */ | |
75 | netif_stop_queue(dev); | |
76 | mipsnet_put_todevice(dev, skb); | |
77 | ||
78 | return 0; | |
79 | } | |
80 | ||
81 | static inline ssize_t mipsnet_get_fromdev(struct net_device *dev, size_t count) | |
82 | { | |
83 | struct sk_buff *skb; | |
84 | size_t len = count; | |
dcbf8477 RB |
85 | |
86 | if (!(skb = alloc_skb(len + 2, GFP_KERNEL))) { | |
09f75cd7 | 87 | dev->stats.rx_dropped++; |
dcbf8477 RB |
88 | return -ENOMEM; |
89 | } | |
90 | ||
91 | skb_reserve(skb, 2); | |
92 | if (ioiocpy_frommipsnet(dev, skb_put(skb, len), len)) | |
93 | return -EFAULT; | |
94 | ||
dcbf8477 RB |
95 | skb->protocol = eth_type_trans(skb, dev); |
96 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
97 | ||
98 | pr_debug("%s:%s(): pushing RXed data to kernel\n", | |
99 | dev->name, __FUNCTION__); | |
100 | netif_rx(skb); | |
101 | ||
09f75cd7 JG |
102 | dev->stats.rx_packets++; |
103 | dev->stats.rx_bytes += len; | |
dcbf8477 RB |
104 | |
105 | return count; | |
106 | } | |
107 | ||
7d12e780 | 108 | static irqreturn_t mipsnet_interrupt(int irq, void *dev_id) |
dcbf8477 RB |
109 | { |
110 | struct net_device *dev = dev_id; | |
111 | ||
112 | irqreturn_t retval = IRQ_NONE; | |
113 | uint64_t interruptFlags; | |
114 | ||
115 | if (irq == dev->irq) { | |
116 | pr_debug("%s:%s(): irq %d for device\n", | |
117 | dev->name, __FUNCTION__, irq); | |
118 | ||
119 | retval = IRQ_HANDLED; | |
120 | ||
121 | interruptFlags = | |
122 | inl(mipsnet_reg_address(dev, interruptControl)); | |
123 | pr_debug("%s:%s(): intCtl=0x%016llx\n", dev->name, | |
124 | __FUNCTION__, interruptFlags); | |
125 | ||
126 | if (interruptFlags & MIPSNET_INTCTL_TXDONE) { | |
127 | pr_debug("%s:%s(): got TXDone\n", | |
128 | dev->name, __FUNCTION__); | |
129 | outl(MIPSNET_INTCTL_TXDONE, | |
130 | mipsnet_reg_address(dev, interruptControl)); | |
131 | // only one packet at a time, we are done. | |
132 | netif_wake_queue(dev); | |
133 | } else if (interruptFlags & MIPSNET_INTCTL_RXDONE) { | |
134 | pr_debug("%s:%s(): got RX data\n", | |
135 | dev->name, __FUNCTION__); | |
136 | mipsnet_get_fromdev(dev, | |
137 | inl(mipsnet_reg_address(dev, rxDataCount))); | |
138 | pr_debug("%s:%s(): clearing RX int\n", | |
139 | dev->name, __FUNCTION__); | |
140 | outl(MIPSNET_INTCTL_RXDONE, | |
141 | mipsnet_reg_address(dev, interruptControl)); | |
142 | ||
143 | } else if (interruptFlags & MIPSNET_INTCTL_TESTBIT) { | |
144 | pr_debug("%s:%s(): got test interrupt\n", | |
145 | dev->name, __FUNCTION__); | |
146 | // TESTBIT is cleared on read. | |
147 | // And takes effect after a write with 0 | |
148 | outl(0, mipsnet_reg_address(dev, interruptControl)); | |
149 | } else { | |
150 | pr_debug("%s:%s(): no valid fags 0x%016llx\n", | |
151 | dev->name, __FUNCTION__, interruptFlags); | |
152 | // Maybe shared IRQ, just ignore, no clearing. | |
153 | retval = IRQ_NONE; | |
154 | } | |
155 | ||
156 | } else { | |
157 | printk(KERN_INFO "%s: %s(): irq %d for unknown device\n", | |
158 | dev->name, __FUNCTION__, irq); | |
159 | retval = IRQ_NONE; | |
160 | } | |
161 | return retval; | |
162 | } //mipsnet_interrupt() | |
163 | ||
164 | static int mipsnet_open(struct net_device *dev) | |
165 | { | |
166 | int err; | |
167 | pr_debug("%s: mipsnet_open\n", dev->name); | |
168 | ||
169 | err = request_irq(dev->irq, &mipsnet_interrupt, | |
1fb9df5d | 170 | IRQF_SHARED, dev->name, (void *) dev); |
dcbf8477 RB |
171 | |
172 | if (err) { | |
173 | pr_debug("%s: %s(): can't get irq %d\n", | |
174 | dev->name, __FUNCTION__, dev->irq); | |
175 | release_region(dev->base_addr, MIPSNET_IO_EXTENT); | |
176 | return err; | |
177 | } | |
178 | ||
179 | pr_debug("%s: %s(): got IO region at 0x%04lx and irq %d for dev.\n", | |
180 | dev->name, __FUNCTION__, dev->base_addr, dev->irq); | |
181 | ||
182 | ||
183 | netif_start_queue(dev); | |
184 | ||
185 | // test interrupt handler | |
186 | outl(MIPSNET_INTCTL_TESTBIT, | |
187 | mipsnet_reg_address(dev, interruptControl)); | |
188 | ||
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
193 | static int mipsnet_close(struct net_device *dev) | |
194 | { | |
195 | pr_debug("%s: %s()\n", dev->name, __FUNCTION__); | |
196 | netif_stop_queue(dev); | |
197 | return 0; | |
198 | } | |
199 | ||
dcbf8477 RB |
200 | static void mipsnet_set_mclist(struct net_device *dev) |
201 | { | |
202 | // we don't do anything | |
203 | return; | |
204 | } | |
205 | ||
206 | static int __init mipsnet_probe(struct device *dev) | |
207 | { | |
208 | struct net_device *netdev; | |
209 | int err; | |
210 | ||
09f75cd7 | 211 | netdev = alloc_etherdev(0); |
dcbf8477 RB |
212 | if (!netdev) { |
213 | err = -ENOMEM; | |
214 | goto out; | |
215 | } | |
216 | ||
217 | dev_set_drvdata(dev, netdev); | |
218 | ||
219 | netdev->open = mipsnet_open; | |
220 | netdev->stop = mipsnet_close; | |
221 | netdev->hard_start_xmit = mipsnet_xmit; | |
dcbf8477 RB |
222 | netdev->set_multicast_list = mipsnet_set_mclist; |
223 | ||
224 | /* | |
225 | * TODO: probe for these or load them from PARAM | |
226 | */ | |
227 | netdev->base_addr = 0x4200; | |
3b1d4ed5 | 228 | netdev->irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_MB0 + |
dcbf8477 RB |
229 | inl(mipsnet_reg_address(netdev, interruptInfo)); |
230 | ||
231 | // Get the io region now, get irq on open() | |
232 | if (!request_region(netdev->base_addr, MIPSNET_IO_EXTENT, "mipsnet")) { | |
233 | pr_debug("%s: %s(): IO region {start: 0x%04lux, len: %d} " | |
234 | "for dev is not availble.\n", netdev->name, | |
235 | __FUNCTION__, netdev->base_addr, MIPSNET_IO_EXTENT); | |
236 | err = -EBUSY; | |
237 | goto out_free_netdev; | |
238 | } | |
239 | ||
240 | /* | |
241 | * Lacking any better mechanism to allocate a MAC address we use a | |
242 | * random one ... | |
243 | */ | |
244 | random_ether_addr(netdev->dev_addr); | |
245 | ||
246 | err = register_netdev(netdev); | |
247 | if (err) { | |
248 | printk(KERN_ERR "MIPSNet: failed to register netdev.\n"); | |
249 | goto out_free_region; | |
250 | } | |
251 | ||
252 | return 0; | |
253 | ||
254 | out_free_region: | |
255 | release_region(netdev->base_addr, MIPSNET_IO_EXTENT); | |
256 | ||
257 | out_free_netdev: | |
258 | free_netdev(netdev); | |
259 | ||
260 | out: | |
261 | return err; | |
262 | } | |
263 | ||
264 | static int __devexit mipsnet_device_remove(struct device *device) | |
265 | { | |
266 | struct net_device *dev = dev_get_drvdata(device); | |
267 | ||
268 | unregister_netdev(dev); | |
269 | release_region(dev->base_addr, MIPSNET_IO_EXTENT); | |
270 | free_netdev(dev); | |
271 | dev_set_drvdata(device, NULL); | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static struct device_driver mipsnet_driver = { | |
277 | .name = mipsnet_string, | |
278 | .bus = &platform_bus_type, | |
279 | .probe = mipsnet_probe, | |
280 | .remove = __devexit_p(mipsnet_device_remove), | |
281 | }; | |
282 | ||
dcbf8477 RB |
283 | static int __init mipsnet_init_module(void) |
284 | { | |
dcbf8477 RB |
285 | int err; |
286 | ||
287 | printk(KERN_INFO "MIPSNet Ethernet driver. Version: %s. " | |
288 | "(c)2005 MIPS Technologies, Inc.\n", MIPSNET_VERSION); | |
289 | ||
1e2b980f RB |
290 | err = driver_register(&mipsnet_driver); |
291 | if (err) | |
dcbf8477 | 292 | printk(KERN_ERR "Driver registration failed\n"); |
dcbf8477 | 293 | |
dcbf8477 RB |
294 | return err; |
295 | } | |
296 | ||
297 | static void __exit mipsnet_exit_module(void) | |
298 | { | |
299 | pr_debug("MIPSNet Ethernet driver exiting\n"); | |
300 | ||
301 | driver_unregister(&mipsnet_driver); | |
302 | } | |
303 | ||
304 | module_init(mipsnet_init_module); | |
305 | module_exit(mipsnet_exit_module); |