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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> | |
d052d1be | 16 | #include <linux/platform_device.h> |
dcbf8477 RB |
17 | #include <asm/io.h> |
18 | #include <asm/mips-boards/simint.h> | |
19 | ||
20 | #include "mipsnet.h" /* actual device IO mapping */ | |
21 | ||
22 | #define MIPSNET_VERSION "2005-06-20" | |
23 | ||
24 | #define mipsnet_reg_address(dev, field) (dev->base_addr + field_offset(field)) | |
25 | ||
26 | struct mipsnet_priv { | |
27 | struct net_device_stats stats; | |
28 | }; | |
29 | ||
30 | static struct platform_device *mips_plat_dev; | |
31 | ||
32 | static char mipsnet_string[] = "mipsnet"; | |
33 | ||
34 | /* | |
35 | * Copy data from the MIPSNET rx data port | |
36 | */ | |
37 | static int ioiocpy_frommipsnet(struct net_device *dev, unsigned char *kdata, | |
38 | int len) | |
39 | { | |
40 | uint32_t available_len = inl(mipsnet_reg_address(dev, rxDataCount)); | |
41 | if (available_len < len) | |
42 | return -EFAULT; | |
43 | ||
44 | for (; len > 0; len--, kdata++) { | |
45 | *kdata = inb(mipsnet_reg_address(dev, rxDataBuffer)); | |
46 | } | |
47 | ||
48 | return inl(mipsnet_reg_address(dev, rxDataCount)); | |
49 | } | |
50 | ||
51 | static inline ssize_t mipsnet_put_todevice(struct net_device *dev, | |
52 | struct sk_buff *skb) | |
53 | { | |
54 | int count_to_go = skb->len; | |
55 | char *buf_ptr = skb->data; | |
56 | struct mipsnet_priv *mp = netdev_priv(dev); | |
57 | ||
58 | pr_debug("%s: %s(): telling MIPSNET txDataCount(%d)\n", | |
59 | dev->name, __FUNCTION__, skb->len); | |
60 | ||
61 | outl(skb->len, mipsnet_reg_address(dev, txDataCount)); | |
62 | ||
63 | pr_debug("%s: %s(): sending data to MIPSNET txDataBuffer(%d)\n", | |
64 | dev->name, __FUNCTION__, skb->len); | |
65 | ||
66 | for (; count_to_go; buf_ptr++, count_to_go--) { | |
67 | outb(*buf_ptr, mipsnet_reg_address(dev, txDataBuffer)); | |
68 | } | |
69 | ||
70 | mp->stats.tx_packets++; | |
71 | mp->stats.tx_bytes += skb->len; | |
72 | ||
73 | return skb->len; | |
74 | } | |
75 | ||
76 | static int mipsnet_xmit(struct sk_buff *skb, struct net_device *dev) | |
77 | { | |
78 | pr_debug("%s:%s(): transmitting %d bytes\n", | |
79 | dev->name, __FUNCTION__, skb->len); | |
80 | ||
81 | /* Only one packet at a time. Once TXDONE interrupt is serviced, the | |
82 | * queue will be restarted. | |
83 | */ | |
84 | netif_stop_queue(dev); | |
85 | mipsnet_put_todevice(dev, skb); | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | static inline ssize_t mipsnet_get_fromdev(struct net_device *dev, size_t count) | |
91 | { | |
92 | struct sk_buff *skb; | |
93 | size_t len = count; | |
94 | struct mipsnet_priv *mp = netdev_priv(dev); | |
95 | ||
96 | if (!(skb = alloc_skb(len + 2, GFP_KERNEL))) { | |
97 | mp->stats.rx_dropped++; | |
98 | return -ENOMEM; | |
99 | } | |
100 | ||
101 | skb_reserve(skb, 2); | |
102 | if (ioiocpy_frommipsnet(dev, skb_put(skb, len), len)) | |
103 | return -EFAULT; | |
104 | ||
105 | skb->dev = dev; | |
106 | skb->protocol = eth_type_trans(skb, dev); | |
107 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
108 | ||
109 | pr_debug("%s:%s(): pushing RXed data to kernel\n", | |
110 | dev->name, __FUNCTION__); | |
111 | netif_rx(skb); | |
112 | ||
113 | mp->stats.rx_packets++; | |
114 | mp->stats.rx_bytes += len; | |
115 | ||
116 | return count; | |
117 | } | |
118 | ||
119 | static irqreturn_t | |
120 | mipsnet_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
121 | { | |
122 | struct net_device *dev = dev_id; | |
123 | ||
124 | irqreturn_t retval = IRQ_NONE; | |
125 | uint64_t interruptFlags; | |
126 | ||
127 | if (irq == dev->irq) { | |
128 | pr_debug("%s:%s(): irq %d for device\n", | |
129 | dev->name, __FUNCTION__, irq); | |
130 | ||
131 | retval = IRQ_HANDLED; | |
132 | ||
133 | interruptFlags = | |
134 | inl(mipsnet_reg_address(dev, interruptControl)); | |
135 | pr_debug("%s:%s(): intCtl=0x%016llx\n", dev->name, | |
136 | __FUNCTION__, interruptFlags); | |
137 | ||
138 | if (interruptFlags & MIPSNET_INTCTL_TXDONE) { | |
139 | pr_debug("%s:%s(): got TXDone\n", | |
140 | dev->name, __FUNCTION__); | |
141 | outl(MIPSNET_INTCTL_TXDONE, | |
142 | mipsnet_reg_address(dev, interruptControl)); | |
143 | // only one packet at a time, we are done. | |
144 | netif_wake_queue(dev); | |
145 | } else if (interruptFlags & MIPSNET_INTCTL_RXDONE) { | |
146 | pr_debug("%s:%s(): got RX data\n", | |
147 | dev->name, __FUNCTION__); | |
148 | mipsnet_get_fromdev(dev, | |
149 | inl(mipsnet_reg_address(dev, rxDataCount))); | |
150 | pr_debug("%s:%s(): clearing RX int\n", | |
151 | dev->name, __FUNCTION__); | |
152 | outl(MIPSNET_INTCTL_RXDONE, | |
153 | mipsnet_reg_address(dev, interruptControl)); | |
154 | ||
155 | } else if (interruptFlags & MIPSNET_INTCTL_TESTBIT) { | |
156 | pr_debug("%s:%s(): got test interrupt\n", | |
157 | dev->name, __FUNCTION__); | |
158 | // TESTBIT is cleared on read. | |
159 | // And takes effect after a write with 0 | |
160 | outl(0, mipsnet_reg_address(dev, interruptControl)); | |
161 | } else { | |
162 | pr_debug("%s:%s(): no valid fags 0x%016llx\n", | |
163 | dev->name, __FUNCTION__, interruptFlags); | |
164 | // Maybe shared IRQ, just ignore, no clearing. | |
165 | retval = IRQ_NONE; | |
166 | } | |
167 | ||
168 | } else { | |
169 | printk(KERN_INFO "%s: %s(): irq %d for unknown device\n", | |
170 | dev->name, __FUNCTION__, irq); | |
171 | retval = IRQ_NONE; | |
172 | } | |
173 | return retval; | |
174 | } //mipsnet_interrupt() | |
175 | ||
176 | static int mipsnet_open(struct net_device *dev) | |
177 | { | |
178 | int err; | |
179 | pr_debug("%s: mipsnet_open\n", dev->name); | |
180 | ||
181 | err = request_irq(dev->irq, &mipsnet_interrupt, | |
1fb9df5d | 182 | IRQF_SHARED, dev->name, (void *) dev); |
dcbf8477 RB |
183 | |
184 | if (err) { | |
185 | pr_debug("%s: %s(): can't get irq %d\n", | |
186 | dev->name, __FUNCTION__, dev->irq); | |
187 | release_region(dev->base_addr, MIPSNET_IO_EXTENT); | |
188 | return err; | |
189 | } | |
190 | ||
191 | pr_debug("%s: %s(): got IO region at 0x%04lx and irq %d for dev.\n", | |
192 | dev->name, __FUNCTION__, dev->base_addr, dev->irq); | |
193 | ||
194 | ||
195 | netif_start_queue(dev); | |
196 | ||
197 | // test interrupt handler | |
198 | outl(MIPSNET_INTCTL_TESTBIT, | |
199 | mipsnet_reg_address(dev, interruptControl)); | |
200 | ||
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | static int mipsnet_close(struct net_device *dev) | |
206 | { | |
207 | pr_debug("%s: %s()\n", dev->name, __FUNCTION__); | |
208 | netif_stop_queue(dev); | |
209 | return 0; | |
210 | } | |
211 | ||
212 | static struct net_device_stats *mipsnet_get_stats(struct net_device *dev) | |
213 | { | |
214 | struct mipsnet_priv *mp = netdev_priv(dev); | |
215 | ||
216 | return &mp->stats; | |
217 | } | |
218 | ||
219 | static void mipsnet_set_mclist(struct net_device *dev) | |
220 | { | |
221 | // we don't do anything | |
222 | return; | |
223 | } | |
224 | ||
225 | static int __init mipsnet_probe(struct device *dev) | |
226 | { | |
227 | struct net_device *netdev; | |
228 | int err; | |
229 | ||
230 | netdev = alloc_etherdev(sizeof(struct mipsnet_priv)); | |
231 | if (!netdev) { | |
232 | err = -ENOMEM; | |
233 | goto out; | |
234 | } | |
235 | ||
236 | dev_set_drvdata(dev, netdev); | |
237 | ||
238 | netdev->open = mipsnet_open; | |
239 | netdev->stop = mipsnet_close; | |
240 | netdev->hard_start_xmit = mipsnet_xmit; | |
241 | netdev->get_stats = mipsnet_get_stats; | |
242 | netdev->set_multicast_list = mipsnet_set_mclist; | |
243 | ||
244 | /* | |
245 | * TODO: probe for these or load them from PARAM | |
246 | */ | |
247 | netdev->base_addr = 0x4200; | |
248 | netdev->irq = MIPSCPU_INT_BASE + MIPSCPU_INT_MB0 + | |
249 | inl(mipsnet_reg_address(netdev, interruptInfo)); | |
250 | ||
251 | // Get the io region now, get irq on open() | |
252 | if (!request_region(netdev->base_addr, MIPSNET_IO_EXTENT, "mipsnet")) { | |
253 | pr_debug("%s: %s(): IO region {start: 0x%04lux, len: %d} " | |
254 | "for dev is not availble.\n", netdev->name, | |
255 | __FUNCTION__, netdev->base_addr, MIPSNET_IO_EXTENT); | |
256 | err = -EBUSY; | |
257 | goto out_free_netdev; | |
258 | } | |
259 | ||
260 | /* | |
261 | * Lacking any better mechanism to allocate a MAC address we use a | |
262 | * random one ... | |
263 | */ | |
264 | random_ether_addr(netdev->dev_addr); | |
265 | ||
266 | err = register_netdev(netdev); | |
267 | if (err) { | |
268 | printk(KERN_ERR "MIPSNet: failed to register netdev.\n"); | |
269 | goto out_free_region; | |
270 | } | |
271 | ||
272 | return 0; | |
273 | ||
274 | out_free_region: | |
275 | release_region(netdev->base_addr, MIPSNET_IO_EXTENT); | |
276 | ||
277 | out_free_netdev: | |
278 | free_netdev(netdev); | |
279 | ||
280 | out: | |
281 | return err; | |
282 | } | |
283 | ||
284 | static int __devexit mipsnet_device_remove(struct device *device) | |
285 | { | |
286 | struct net_device *dev = dev_get_drvdata(device); | |
287 | ||
288 | unregister_netdev(dev); | |
289 | release_region(dev->base_addr, MIPSNET_IO_EXTENT); | |
290 | free_netdev(dev); | |
291 | dev_set_drvdata(device, NULL); | |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
296 | static struct device_driver mipsnet_driver = { | |
297 | .name = mipsnet_string, | |
298 | .bus = &platform_bus_type, | |
299 | .probe = mipsnet_probe, | |
300 | .remove = __devexit_p(mipsnet_device_remove), | |
301 | }; | |
302 | ||
303 | static void mipsnet_platform_release(struct device *device) | |
304 | { | |
305 | struct platform_device *pldev; | |
306 | ||
307 | /* free device */ | |
308 | pldev = to_platform_device(device); | |
309 | kfree(pldev); | |
310 | } | |
311 | ||
312 | static int __init mipsnet_init_module(void) | |
313 | { | |
314 | struct platform_device *pldev; | |
315 | int err; | |
316 | ||
317 | printk(KERN_INFO "MIPSNet Ethernet driver. Version: %s. " | |
318 | "(c)2005 MIPS Technologies, Inc.\n", MIPSNET_VERSION); | |
319 | ||
320 | if (driver_register(&mipsnet_driver)) { | |
321 | printk(KERN_ERR "Driver registration failed\n"); | |
322 | err = -ENODEV; | |
323 | goto out; | |
324 | } | |
325 | ||
326 | if (!(pldev = kmalloc (sizeof (*pldev), GFP_KERNEL))) { | |
327 | err = -ENOMEM; | |
328 | goto out_unregister_driver; | |
329 | } | |
330 | ||
331 | memset (pldev, 0, sizeof (*pldev)); | |
332 | pldev->name = mipsnet_string; | |
333 | pldev->id = 0; | |
334 | pldev->dev.release = mipsnet_platform_release; | |
335 | ||
336 | if (platform_device_register(pldev)) { | |
337 | err = -ENODEV; | |
338 | goto out_free_pldev; | |
339 | } | |
340 | ||
341 | if (!pldev->dev.driver) { | |
342 | /* | |
343 | * The driver was not bound to this device, there was | |
344 | * no hardware at this address. Unregister it, as the | |
345 | * release fuction will take care of freeing the | |
346 | * allocated structure | |
347 | */ | |
348 | platform_device_unregister (pldev); | |
349 | } | |
350 | ||
351 | mips_plat_dev = pldev; | |
352 | ||
353 | return 0; | |
354 | ||
355 | out_free_pldev: | |
356 | kfree(pldev); | |
357 | ||
358 | out_unregister_driver: | |
359 | driver_unregister(&mipsnet_driver); | |
360 | out: | |
361 | return err; | |
362 | } | |
363 | ||
364 | static void __exit mipsnet_exit_module(void) | |
365 | { | |
366 | pr_debug("MIPSNet Ethernet driver exiting\n"); | |
367 | ||
368 | driver_unregister(&mipsnet_driver); | |
369 | } | |
370 | ||
371 | module_init(mipsnet_init_module); | |
372 | module_exit(mipsnet_exit_module); |