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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> | |
13 | #include <linux/sched.h> | |
14 | #include <linux/etherdevice.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <asm/io.h> | |
17 | #include <asm/mips-boards/simint.h> | |
18 | ||
19 | #include "mipsnet.h" /* actual device IO mapping */ | |
20 | ||
21 | #define MIPSNET_VERSION "2005-06-20" | |
22 | ||
23 | #define mipsnet_reg_address(dev, field) (dev->base_addr + field_offset(field)) | |
24 | ||
25 | struct mipsnet_priv { | |
26 | struct net_device_stats stats; | |
27 | }; | |
28 | ||
29 | static struct platform_device *mips_plat_dev; | |
30 | ||
31 | static char mipsnet_string[] = "mipsnet"; | |
32 | ||
33 | /* | |
34 | * Copy data from the MIPSNET rx data port | |
35 | */ | |
36 | static int ioiocpy_frommipsnet(struct net_device *dev, unsigned char *kdata, | |
37 | int len) | |
38 | { | |
39 | uint32_t available_len = inl(mipsnet_reg_address(dev, rxDataCount)); | |
40 | if (available_len < len) | |
41 | return -EFAULT; | |
42 | ||
43 | for (; len > 0; len--, kdata++) { | |
44 | *kdata = inb(mipsnet_reg_address(dev, rxDataBuffer)); | |
45 | } | |
46 | ||
47 | return inl(mipsnet_reg_address(dev, rxDataCount)); | |
48 | } | |
49 | ||
50 | static inline ssize_t mipsnet_put_todevice(struct net_device *dev, | |
51 | struct sk_buff *skb) | |
52 | { | |
53 | int count_to_go = skb->len; | |
54 | char *buf_ptr = skb->data; | |
55 | struct mipsnet_priv *mp = netdev_priv(dev); | |
56 | ||
57 | pr_debug("%s: %s(): telling MIPSNET txDataCount(%d)\n", | |
58 | dev->name, __FUNCTION__, skb->len); | |
59 | ||
60 | outl(skb->len, mipsnet_reg_address(dev, txDataCount)); | |
61 | ||
62 | pr_debug("%s: %s(): sending data to MIPSNET txDataBuffer(%d)\n", | |
63 | dev->name, __FUNCTION__, skb->len); | |
64 | ||
65 | for (; count_to_go; buf_ptr++, count_to_go--) { | |
66 | outb(*buf_ptr, mipsnet_reg_address(dev, txDataBuffer)); | |
67 | } | |
68 | ||
69 | mp->stats.tx_packets++; | |
70 | mp->stats.tx_bytes += skb->len; | |
71 | ||
72 | return skb->len; | |
73 | } | |
74 | ||
75 | static int mipsnet_xmit(struct sk_buff *skb, struct net_device *dev) | |
76 | { | |
77 | pr_debug("%s:%s(): transmitting %d bytes\n", | |
78 | dev->name, __FUNCTION__, skb->len); | |
79 | ||
80 | /* Only one packet at a time. Once TXDONE interrupt is serviced, the | |
81 | * queue will be restarted. | |
82 | */ | |
83 | netif_stop_queue(dev); | |
84 | mipsnet_put_todevice(dev, skb); | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | static inline ssize_t mipsnet_get_fromdev(struct net_device *dev, size_t count) | |
90 | { | |
91 | struct sk_buff *skb; | |
92 | size_t len = count; | |
93 | struct mipsnet_priv *mp = netdev_priv(dev); | |
94 | ||
95 | if (!(skb = alloc_skb(len + 2, GFP_KERNEL))) { | |
96 | mp->stats.rx_dropped++; | |
97 | return -ENOMEM; | |
98 | } | |
99 | ||
100 | skb_reserve(skb, 2); | |
101 | if (ioiocpy_frommipsnet(dev, skb_put(skb, len), len)) | |
102 | return -EFAULT; | |
103 | ||
104 | skb->dev = dev; | |
105 | skb->protocol = eth_type_trans(skb, dev); | |
106 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
107 | ||
108 | pr_debug("%s:%s(): pushing RXed data to kernel\n", | |
109 | dev->name, __FUNCTION__); | |
110 | netif_rx(skb); | |
111 | ||
112 | mp->stats.rx_packets++; | |
113 | mp->stats.rx_bytes += len; | |
114 | ||
115 | return count; | |
116 | } | |
117 | ||
118 | static irqreturn_t | |
119 | mipsnet_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
120 | { | |
121 | struct net_device *dev = dev_id; | |
122 | ||
123 | irqreturn_t retval = IRQ_NONE; | |
124 | uint64_t interruptFlags; | |
125 | ||
126 | if (irq == dev->irq) { | |
127 | pr_debug("%s:%s(): irq %d for device\n", | |
128 | dev->name, __FUNCTION__, irq); | |
129 | ||
130 | retval = IRQ_HANDLED; | |
131 | ||
132 | interruptFlags = | |
133 | inl(mipsnet_reg_address(dev, interruptControl)); | |
134 | pr_debug("%s:%s(): intCtl=0x%016llx\n", dev->name, | |
135 | __FUNCTION__, interruptFlags); | |
136 | ||
137 | if (interruptFlags & MIPSNET_INTCTL_TXDONE) { | |
138 | pr_debug("%s:%s(): got TXDone\n", | |
139 | dev->name, __FUNCTION__); | |
140 | outl(MIPSNET_INTCTL_TXDONE, | |
141 | mipsnet_reg_address(dev, interruptControl)); | |
142 | // only one packet at a time, we are done. | |
143 | netif_wake_queue(dev); | |
144 | } else if (interruptFlags & MIPSNET_INTCTL_RXDONE) { | |
145 | pr_debug("%s:%s(): got RX data\n", | |
146 | dev->name, __FUNCTION__); | |
147 | mipsnet_get_fromdev(dev, | |
148 | inl(mipsnet_reg_address(dev, rxDataCount))); | |
149 | pr_debug("%s:%s(): clearing RX int\n", | |
150 | dev->name, __FUNCTION__); | |
151 | outl(MIPSNET_INTCTL_RXDONE, | |
152 | mipsnet_reg_address(dev, interruptControl)); | |
153 | ||
154 | } else if (interruptFlags & MIPSNET_INTCTL_TESTBIT) { | |
155 | pr_debug("%s:%s(): got test interrupt\n", | |
156 | dev->name, __FUNCTION__); | |
157 | // TESTBIT is cleared on read. | |
158 | // And takes effect after a write with 0 | |
159 | outl(0, mipsnet_reg_address(dev, interruptControl)); | |
160 | } else { | |
161 | pr_debug("%s:%s(): no valid fags 0x%016llx\n", | |
162 | dev->name, __FUNCTION__, interruptFlags); | |
163 | // Maybe shared IRQ, just ignore, no clearing. | |
164 | retval = IRQ_NONE; | |
165 | } | |
166 | ||
167 | } else { | |
168 | printk(KERN_INFO "%s: %s(): irq %d for unknown device\n", | |
169 | dev->name, __FUNCTION__, irq); | |
170 | retval = IRQ_NONE; | |
171 | } | |
172 | return retval; | |
173 | } //mipsnet_interrupt() | |
174 | ||
175 | static int mipsnet_open(struct net_device *dev) | |
176 | { | |
177 | int err; | |
178 | pr_debug("%s: mipsnet_open\n", dev->name); | |
179 | ||
180 | err = request_irq(dev->irq, &mipsnet_interrupt, | |
181 | SA_SHIRQ, dev->name, (void *) dev); | |
182 | ||
183 | if (err) { | |
184 | pr_debug("%s: %s(): can't get irq %d\n", | |
185 | dev->name, __FUNCTION__, dev->irq); | |
186 | release_region(dev->base_addr, MIPSNET_IO_EXTENT); | |
187 | return err; | |
188 | } | |
189 | ||
190 | pr_debug("%s: %s(): got IO region at 0x%04lx and irq %d for dev.\n", | |
191 | dev->name, __FUNCTION__, dev->base_addr, dev->irq); | |
192 | ||
193 | ||
194 | netif_start_queue(dev); | |
195 | ||
196 | // test interrupt handler | |
197 | outl(MIPSNET_INTCTL_TESTBIT, | |
198 | mipsnet_reg_address(dev, interruptControl)); | |
199 | ||
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | static int mipsnet_close(struct net_device *dev) | |
205 | { | |
206 | pr_debug("%s: %s()\n", dev->name, __FUNCTION__); | |
207 | netif_stop_queue(dev); | |
208 | return 0; | |
209 | } | |
210 | ||
211 | static struct net_device_stats *mipsnet_get_stats(struct net_device *dev) | |
212 | { | |
213 | struct mipsnet_priv *mp = netdev_priv(dev); | |
214 | ||
215 | return &mp->stats; | |
216 | } | |
217 | ||
218 | static void mipsnet_set_mclist(struct net_device *dev) | |
219 | { | |
220 | // we don't do anything | |
221 | return; | |
222 | } | |
223 | ||
224 | static int __init mipsnet_probe(struct device *dev) | |
225 | { | |
226 | struct net_device *netdev; | |
227 | int err; | |
228 | ||
229 | netdev = alloc_etherdev(sizeof(struct mipsnet_priv)); | |
230 | if (!netdev) { | |
231 | err = -ENOMEM; | |
232 | goto out; | |
233 | } | |
234 | ||
235 | dev_set_drvdata(dev, netdev); | |
236 | ||
237 | netdev->open = mipsnet_open; | |
238 | netdev->stop = mipsnet_close; | |
239 | netdev->hard_start_xmit = mipsnet_xmit; | |
240 | netdev->get_stats = mipsnet_get_stats; | |
241 | netdev->set_multicast_list = mipsnet_set_mclist; | |
242 | ||
243 | /* | |
244 | * TODO: probe for these or load them from PARAM | |
245 | */ | |
246 | netdev->base_addr = 0x4200; | |
247 | netdev->irq = MIPSCPU_INT_BASE + MIPSCPU_INT_MB0 + | |
248 | inl(mipsnet_reg_address(netdev, interruptInfo)); | |
249 | ||
250 | // Get the io region now, get irq on open() | |
251 | if (!request_region(netdev->base_addr, MIPSNET_IO_EXTENT, "mipsnet")) { | |
252 | pr_debug("%s: %s(): IO region {start: 0x%04lux, len: %d} " | |
253 | "for dev is not availble.\n", netdev->name, | |
254 | __FUNCTION__, netdev->base_addr, MIPSNET_IO_EXTENT); | |
255 | err = -EBUSY; | |
256 | goto out_free_netdev; | |
257 | } | |
258 | ||
259 | /* | |
260 | * Lacking any better mechanism to allocate a MAC address we use a | |
261 | * random one ... | |
262 | */ | |
263 | random_ether_addr(netdev->dev_addr); | |
264 | ||
265 | err = register_netdev(netdev); | |
266 | if (err) { | |
267 | printk(KERN_ERR "MIPSNet: failed to register netdev.\n"); | |
268 | goto out_free_region; | |
269 | } | |
270 | ||
271 | return 0; | |
272 | ||
273 | out_free_region: | |
274 | release_region(netdev->base_addr, MIPSNET_IO_EXTENT); | |
275 | ||
276 | out_free_netdev: | |
277 | free_netdev(netdev); | |
278 | ||
279 | out: | |
280 | return err; | |
281 | } | |
282 | ||
283 | static int __devexit mipsnet_device_remove(struct device *device) | |
284 | { | |
285 | struct net_device *dev = dev_get_drvdata(device); | |
286 | ||
287 | unregister_netdev(dev); | |
288 | release_region(dev->base_addr, MIPSNET_IO_EXTENT); | |
289 | free_netdev(dev); | |
290 | dev_set_drvdata(device, NULL); | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
295 | static struct device_driver mipsnet_driver = { | |
296 | .name = mipsnet_string, | |
297 | .bus = &platform_bus_type, | |
298 | .probe = mipsnet_probe, | |
299 | .remove = __devexit_p(mipsnet_device_remove), | |
300 | }; | |
301 | ||
302 | static void mipsnet_platform_release(struct device *device) | |
303 | { | |
304 | struct platform_device *pldev; | |
305 | ||
306 | /* free device */ | |
307 | pldev = to_platform_device(device); | |
308 | kfree(pldev); | |
309 | } | |
310 | ||
311 | static int __init mipsnet_init_module(void) | |
312 | { | |
313 | struct platform_device *pldev; | |
314 | int err; | |
315 | ||
316 | printk(KERN_INFO "MIPSNet Ethernet driver. Version: %s. " | |
317 | "(c)2005 MIPS Technologies, Inc.\n", MIPSNET_VERSION); | |
318 | ||
319 | if (driver_register(&mipsnet_driver)) { | |
320 | printk(KERN_ERR "Driver registration failed\n"); | |
321 | err = -ENODEV; | |
322 | goto out; | |
323 | } | |
324 | ||
325 | if (!(pldev = kmalloc (sizeof (*pldev), GFP_KERNEL))) { | |
326 | err = -ENOMEM; | |
327 | goto out_unregister_driver; | |
328 | } | |
329 | ||
330 | memset (pldev, 0, sizeof (*pldev)); | |
331 | pldev->name = mipsnet_string; | |
332 | pldev->id = 0; | |
333 | pldev->dev.release = mipsnet_platform_release; | |
334 | ||
335 | if (platform_device_register(pldev)) { | |
336 | err = -ENODEV; | |
337 | goto out_free_pldev; | |
338 | } | |
339 | ||
340 | if (!pldev->dev.driver) { | |
341 | /* | |
342 | * The driver was not bound to this device, there was | |
343 | * no hardware at this address. Unregister it, as the | |
344 | * release fuction will take care of freeing the | |
345 | * allocated structure | |
346 | */ | |
347 | platform_device_unregister (pldev); | |
348 | } | |
349 | ||
350 | mips_plat_dev = pldev; | |
351 | ||
352 | return 0; | |
353 | ||
354 | out_free_pldev: | |
355 | kfree(pldev); | |
356 | ||
357 | out_unregister_driver: | |
358 | driver_unregister(&mipsnet_driver); | |
359 | out: | |
360 | return err; | |
361 | } | |
362 | ||
363 | static void __exit mipsnet_exit_module(void) | |
364 | { | |
365 | pr_debug("MIPSNet Ethernet driver exiting\n"); | |
366 | ||
367 | driver_unregister(&mipsnet_driver); | |
368 | } | |
369 | ||
370 | module_init(mipsnet_init_module); | |
371 | module_exit(mipsnet_exit_module); |