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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 RB |
13 | #include <linux/etherdevice.h> |
14 | #include <linux/netdevice.h> | |
d052d1be | 15 | #include <linux/platform_device.h> |
dcbf8477 RB |
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 | ||
dcbf8477 RB |
104 | skb->protocol = eth_type_trans(skb, dev); |
105 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
106 | ||
107 | pr_debug("%s:%s(): pushing RXed data to kernel\n", | |
108 | dev->name, __FUNCTION__); | |
109 | netif_rx(skb); | |
110 | ||
111 | mp->stats.rx_packets++; | |
112 | mp->stats.rx_bytes += len; | |
113 | ||
114 | return count; | |
115 | } | |
116 | ||
7d12e780 | 117 | static irqreturn_t mipsnet_interrupt(int irq, void *dev_id) |
dcbf8477 RB |
118 | { |
119 | struct net_device *dev = dev_id; | |
120 | ||
121 | irqreturn_t retval = IRQ_NONE; | |
122 | uint64_t interruptFlags; | |
123 | ||
124 | if (irq == dev->irq) { | |
125 | pr_debug("%s:%s(): irq %d for device\n", | |
126 | dev->name, __FUNCTION__, irq); | |
127 | ||
128 | retval = IRQ_HANDLED; | |
129 | ||
130 | interruptFlags = | |
131 | inl(mipsnet_reg_address(dev, interruptControl)); | |
132 | pr_debug("%s:%s(): intCtl=0x%016llx\n", dev->name, | |
133 | __FUNCTION__, interruptFlags); | |
134 | ||
135 | if (interruptFlags & MIPSNET_INTCTL_TXDONE) { | |
136 | pr_debug("%s:%s(): got TXDone\n", | |
137 | dev->name, __FUNCTION__); | |
138 | outl(MIPSNET_INTCTL_TXDONE, | |
139 | mipsnet_reg_address(dev, interruptControl)); | |
140 | // only one packet at a time, we are done. | |
141 | netif_wake_queue(dev); | |
142 | } else if (interruptFlags & MIPSNET_INTCTL_RXDONE) { | |
143 | pr_debug("%s:%s(): got RX data\n", | |
144 | dev->name, __FUNCTION__); | |
145 | mipsnet_get_fromdev(dev, | |
146 | inl(mipsnet_reg_address(dev, rxDataCount))); | |
147 | pr_debug("%s:%s(): clearing RX int\n", | |
148 | dev->name, __FUNCTION__); | |
149 | outl(MIPSNET_INTCTL_RXDONE, | |
150 | mipsnet_reg_address(dev, interruptControl)); | |
151 | ||
152 | } else if (interruptFlags & MIPSNET_INTCTL_TESTBIT) { | |
153 | pr_debug("%s:%s(): got test interrupt\n", | |
154 | dev->name, __FUNCTION__); | |
155 | // TESTBIT is cleared on read. | |
156 | // And takes effect after a write with 0 | |
157 | outl(0, mipsnet_reg_address(dev, interruptControl)); | |
158 | } else { | |
159 | pr_debug("%s:%s(): no valid fags 0x%016llx\n", | |
160 | dev->name, __FUNCTION__, interruptFlags); | |
161 | // Maybe shared IRQ, just ignore, no clearing. | |
162 | retval = IRQ_NONE; | |
163 | } | |
164 | ||
165 | } else { | |
166 | printk(KERN_INFO "%s: %s(): irq %d for unknown device\n", | |
167 | dev->name, __FUNCTION__, irq); | |
168 | retval = IRQ_NONE; | |
169 | } | |
170 | return retval; | |
171 | } //mipsnet_interrupt() | |
172 | ||
173 | static int mipsnet_open(struct net_device *dev) | |
174 | { | |
175 | int err; | |
176 | pr_debug("%s: mipsnet_open\n", dev->name); | |
177 | ||
178 | err = request_irq(dev->irq, &mipsnet_interrupt, | |
1fb9df5d | 179 | IRQF_SHARED, dev->name, (void *) dev); |
dcbf8477 RB |
180 | |
181 | if (err) { | |
182 | pr_debug("%s: %s(): can't get irq %d\n", | |
183 | dev->name, __FUNCTION__, dev->irq); | |
184 | release_region(dev->base_addr, MIPSNET_IO_EXTENT); | |
185 | return err; | |
186 | } | |
187 | ||
188 | pr_debug("%s: %s(): got IO region at 0x%04lx and irq %d for dev.\n", | |
189 | dev->name, __FUNCTION__, dev->base_addr, dev->irq); | |
190 | ||
191 | ||
192 | netif_start_queue(dev); | |
193 | ||
194 | // test interrupt handler | |
195 | outl(MIPSNET_INTCTL_TESTBIT, | |
196 | mipsnet_reg_address(dev, interruptControl)); | |
197 | ||
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | static int mipsnet_close(struct net_device *dev) | |
203 | { | |
204 | pr_debug("%s: %s()\n", dev->name, __FUNCTION__); | |
205 | netif_stop_queue(dev); | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static struct net_device_stats *mipsnet_get_stats(struct net_device *dev) | |
210 | { | |
211 | struct mipsnet_priv *mp = netdev_priv(dev); | |
212 | ||
213 | return &mp->stats; | |
214 | } | |
215 | ||
216 | static void mipsnet_set_mclist(struct net_device *dev) | |
217 | { | |
218 | // we don't do anything | |
219 | return; | |
220 | } | |
221 | ||
222 | static int __init mipsnet_probe(struct device *dev) | |
223 | { | |
224 | struct net_device *netdev; | |
225 | int err; | |
226 | ||
227 | netdev = alloc_etherdev(sizeof(struct mipsnet_priv)); | |
228 | if (!netdev) { | |
229 | err = -ENOMEM; | |
230 | goto out; | |
231 | } | |
232 | ||
233 | dev_set_drvdata(dev, netdev); | |
234 | ||
235 | netdev->open = mipsnet_open; | |
236 | netdev->stop = mipsnet_close; | |
237 | netdev->hard_start_xmit = mipsnet_xmit; | |
238 | netdev->get_stats = mipsnet_get_stats; | |
239 | netdev->set_multicast_list = mipsnet_set_mclist; | |
240 | ||
241 | /* | |
242 | * TODO: probe for these or load them from PARAM | |
243 | */ | |
244 | netdev->base_addr = 0x4200; | |
245 | netdev->irq = MIPSCPU_INT_BASE + MIPSCPU_INT_MB0 + | |
246 | inl(mipsnet_reg_address(netdev, interruptInfo)); | |
247 | ||
248 | // Get the io region now, get irq on open() | |
249 | if (!request_region(netdev->base_addr, MIPSNET_IO_EXTENT, "mipsnet")) { | |
250 | pr_debug("%s: %s(): IO region {start: 0x%04lux, len: %d} " | |
251 | "for dev is not availble.\n", netdev->name, | |
252 | __FUNCTION__, netdev->base_addr, MIPSNET_IO_EXTENT); | |
253 | err = -EBUSY; | |
254 | goto out_free_netdev; | |
255 | } | |
256 | ||
257 | /* | |
258 | * Lacking any better mechanism to allocate a MAC address we use a | |
259 | * random one ... | |
260 | */ | |
261 | random_ether_addr(netdev->dev_addr); | |
262 | ||
263 | err = register_netdev(netdev); | |
264 | if (err) { | |
265 | printk(KERN_ERR "MIPSNet: failed to register netdev.\n"); | |
266 | goto out_free_region; | |
267 | } | |
268 | ||
269 | return 0; | |
270 | ||
271 | out_free_region: | |
272 | release_region(netdev->base_addr, MIPSNET_IO_EXTENT); | |
273 | ||
274 | out_free_netdev: | |
275 | free_netdev(netdev); | |
276 | ||
277 | out: | |
278 | return err; | |
279 | } | |
280 | ||
281 | static int __devexit mipsnet_device_remove(struct device *device) | |
282 | { | |
283 | struct net_device *dev = dev_get_drvdata(device); | |
284 | ||
285 | unregister_netdev(dev); | |
286 | release_region(dev->base_addr, MIPSNET_IO_EXTENT); | |
287 | free_netdev(dev); | |
288 | dev_set_drvdata(device, NULL); | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
293 | static struct device_driver mipsnet_driver = { | |
294 | .name = mipsnet_string, | |
295 | .bus = &platform_bus_type, | |
296 | .probe = mipsnet_probe, | |
297 | .remove = __devexit_p(mipsnet_device_remove), | |
298 | }; | |
299 | ||
300 | static void mipsnet_platform_release(struct device *device) | |
301 | { | |
302 | struct platform_device *pldev; | |
303 | ||
304 | /* free device */ | |
305 | pldev = to_platform_device(device); | |
306 | kfree(pldev); | |
307 | } | |
308 | ||
309 | static int __init mipsnet_init_module(void) | |
310 | { | |
311 | struct platform_device *pldev; | |
312 | int err; | |
313 | ||
314 | printk(KERN_INFO "MIPSNet Ethernet driver. Version: %s. " | |
315 | "(c)2005 MIPS Technologies, Inc.\n", MIPSNET_VERSION); | |
316 | ||
317 | if (driver_register(&mipsnet_driver)) { | |
318 | printk(KERN_ERR "Driver registration failed\n"); | |
319 | err = -ENODEV; | |
320 | goto out; | |
321 | } | |
322 | ||
323 | if (!(pldev = kmalloc (sizeof (*pldev), GFP_KERNEL))) { | |
324 | err = -ENOMEM; | |
325 | goto out_unregister_driver; | |
326 | } | |
327 | ||
328 | memset (pldev, 0, sizeof (*pldev)); | |
329 | pldev->name = mipsnet_string; | |
330 | pldev->id = 0; | |
331 | pldev->dev.release = mipsnet_platform_release; | |
332 | ||
333 | if (platform_device_register(pldev)) { | |
334 | err = -ENODEV; | |
335 | goto out_free_pldev; | |
336 | } | |
337 | ||
338 | if (!pldev->dev.driver) { | |
339 | /* | |
340 | * The driver was not bound to this device, there was | |
341 | * no hardware at this address. Unregister it, as the | |
342 | * release fuction will take care of freeing the | |
343 | * allocated structure | |
344 | */ | |
345 | platform_device_unregister (pldev); | |
346 | } | |
347 | ||
348 | mips_plat_dev = pldev; | |
349 | ||
350 | return 0; | |
351 | ||
352 | out_free_pldev: | |
353 | kfree(pldev); | |
354 | ||
355 | out_unregister_driver: | |
356 | driver_unregister(&mipsnet_driver); | |
357 | out: | |
358 | return err; | |
359 | } | |
360 | ||
361 | static void __exit mipsnet_exit_module(void) | |
362 | { | |
363 | pr_debug("MIPSNet Ethernet driver exiting\n"); | |
364 | ||
365 | driver_unregister(&mipsnet_driver); | |
366 | } | |
367 | ||
368 | module_init(mipsnet_init_module); | |
369 | module_exit(mipsnet_exit_module); |