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a1702857 TR |
1 | /* |
2 | * linux/drivers/net/ethoc.c | |
3 | * | |
4 | * Copyright (C) 2007-2008 Avionic Design Development GmbH | |
5 | * Copyright (C) 2008-2009 Avionic Design GmbH | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * Written by Thierry Reding <thierry.reding@avionic-design.de> | |
12 | */ | |
13 | ||
14 | #include <linux/etherdevice.h> | |
15 | #include <linux/crc32.h> | |
16 | #include <linux/io.h> | |
17 | #include <linux/mii.h> | |
18 | #include <linux/phy.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <net/ethoc.h> | |
21 | ||
22 | /* register offsets */ | |
23 | #define MODER 0x00 | |
24 | #define INT_SOURCE 0x04 | |
25 | #define INT_MASK 0x08 | |
26 | #define IPGT 0x0c | |
27 | #define IPGR1 0x10 | |
28 | #define IPGR2 0x14 | |
29 | #define PACKETLEN 0x18 | |
30 | #define COLLCONF 0x1c | |
31 | #define TX_BD_NUM 0x20 | |
32 | #define CTRLMODER 0x24 | |
33 | #define MIIMODER 0x28 | |
34 | #define MIICOMMAND 0x2c | |
35 | #define MIIADDRESS 0x30 | |
36 | #define MIITX_DATA 0x34 | |
37 | #define MIIRX_DATA 0x38 | |
38 | #define MIISTATUS 0x3c | |
39 | #define MAC_ADDR0 0x40 | |
40 | #define MAC_ADDR1 0x44 | |
41 | #define ETH_HASH0 0x48 | |
42 | #define ETH_HASH1 0x4c | |
43 | #define ETH_TXCTRL 0x50 | |
44 | ||
45 | /* mode register */ | |
46 | #define MODER_RXEN (1 << 0) /* receive enable */ | |
47 | #define MODER_TXEN (1 << 1) /* transmit enable */ | |
48 | #define MODER_NOPRE (1 << 2) /* no preamble */ | |
49 | #define MODER_BRO (1 << 3) /* broadcast address */ | |
50 | #define MODER_IAM (1 << 4) /* individual address mode */ | |
51 | #define MODER_PRO (1 << 5) /* promiscuous mode */ | |
52 | #define MODER_IFG (1 << 6) /* interframe gap for incoming frames */ | |
53 | #define MODER_LOOP (1 << 7) /* loopback */ | |
54 | #define MODER_NBO (1 << 8) /* no back-off */ | |
55 | #define MODER_EDE (1 << 9) /* excess defer enable */ | |
56 | #define MODER_FULLD (1 << 10) /* full duplex */ | |
57 | #define MODER_RESET (1 << 11) /* FIXME: reset (undocumented) */ | |
58 | #define MODER_DCRC (1 << 12) /* delayed CRC enable */ | |
59 | #define MODER_CRC (1 << 13) /* CRC enable */ | |
60 | #define MODER_HUGE (1 << 14) /* huge packets enable */ | |
61 | #define MODER_PAD (1 << 15) /* padding enabled */ | |
62 | #define MODER_RSM (1 << 16) /* receive small packets */ | |
63 | ||
64 | /* interrupt source and mask registers */ | |
65 | #define INT_MASK_TXF (1 << 0) /* transmit frame */ | |
66 | #define INT_MASK_TXE (1 << 1) /* transmit error */ | |
67 | #define INT_MASK_RXF (1 << 2) /* receive frame */ | |
68 | #define INT_MASK_RXE (1 << 3) /* receive error */ | |
69 | #define INT_MASK_BUSY (1 << 4) | |
70 | #define INT_MASK_TXC (1 << 5) /* transmit control frame */ | |
71 | #define INT_MASK_RXC (1 << 6) /* receive control frame */ | |
72 | ||
73 | #define INT_MASK_TX (INT_MASK_TXF | INT_MASK_TXE) | |
74 | #define INT_MASK_RX (INT_MASK_RXF | INT_MASK_RXE) | |
75 | ||
76 | #define INT_MASK_ALL ( \ | |
77 | INT_MASK_TXF | INT_MASK_TXE | \ | |
78 | INT_MASK_RXF | INT_MASK_RXE | \ | |
79 | INT_MASK_TXC | INT_MASK_RXC | \ | |
80 | INT_MASK_BUSY \ | |
81 | ) | |
82 | ||
83 | /* packet length register */ | |
84 | #define PACKETLEN_MIN(min) (((min) & 0xffff) << 16) | |
85 | #define PACKETLEN_MAX(max) (((max) & 0xffff) << 0) | |
86 | #define PACKETLEN_MIN_MAX(min, max) (PACKETLEN_MIN(min) | \ | |
87 | PACKETLEN_MAX(max)) | |
88 | ||
89 | /* transmit buffer number register */ | |
90 | #define TX_BD_NUM_VAL(x) (((x) <= 0x80) ? (x) : 0x80) | |
91 | ||
92 | /* control module mode register */ | |
93 | #define CTRLMODER_PASSALL (1 << 0) /* pass all receive frames */ | |
94 | #define CTRLMODER_RXFLOW (1 << 1) /* receive control flow */ | |
95 | #define CTRLMODER_TXFLOW (1 << 2) /* transmit control flow */ | |
96 | ||
97 | /* MII mode register */ | |
98 | #define MIIMODER_CLKDIV(x) ((x) & 0xfe) /* needs to be an even number */ | |
99 | #define MIIMODER_NOPRE (1 << 8) /* no preamble */ | |
100 | ||
101 | /* MII command register */ | |
102 | #define MIICOMMAND_SCAN (1 << 0) /* scan status */ | |
103 | #define MIICOMMAND_READ (1 << 1) /* read status */ | |
104 | #define MIICOMMAND_WRITE (1 << 2) /* write control data */ | |
105 | ||
106 | /* MII address register */ | |
107 | #define MIIADDRESS_FIAD(x) (((x) & 0x1f) << 0) | |
108 | #define MIIADDRESS_RGAD(x) (((x) & 0x1f) << 8) | |
109 | #define MIIADDRESS_ADDR(phy, reg) (MIIADDRESS_FIAD(phy) | \ | |
110 | MIIADDRESS_RGAD(reg)) | |
111 | ||
112 | /* MII transmit data register */ | |
113 | #define MIITX_DATA_VAL(x) ((x) & 0xffff) | |
114 | ||
115 | /* MII receive data register */ | |
116 | #define MIIRX_DATA_VAL(x) ((x) & 0xffff) | |
117 | ||
118 | /* MII status register */ | |
119 | #define MIISTATUS_LINKFAIL (1 << 0) | |
120 | #define MIISTATUS_BUSY (1 << 1) | |
121 | #define MIISTATUS_INVALID (1 << 2) | |
122 | ||
123 | /* TX buffer descriptor */ | |
124 | #define TX_BD_CS (1 << 0) /* carrier sense lost */ | |
125 | #define TX_BD_DF (1 << 1) /* defer indication */ | |
126 | #define TX_BD_LC (1 << 2) /* late collision */ | |
127 | #define TX_BD_RL (1 << 3) /* retransmission limit */ | |
128 | #define TX_BD_RETRY_MASK (0x00f0) | |
129 | #define TX_BD_RETRY(x) (((x) & 0x00f0) >> 4) | |
130 | #define TX_BD_UR (1 << 8) /* transmitter underrun */ | |
131 | #define TX_BD_CRC (1 << 11) /* TX CRC enable */ | |
132 | #define TX_BD_PAD (1 << 12) /* pad enable for short packets */ | |
133 | #define TX_BD_WRAP (1 << 13) | |
134 | #define TX_BD_IRQ (1 << 14) /* interrupt request enable */ | |
135 | #define TX_BD_READY (1 << 15) /* TX buffer ready */ | |
136 | #define TX_BD_LEN(x) (((x) & 0xffff) << 16) | |
137 | #define TX_BD_LEN_MASK (0xffff << 16) | |
138 | ||
139 | #define TX_BD_STATS (TX_BD_CS | TX_BD_DF | TX_BD_LC | \ | |
140 | TX_BD_RL | TX_BD_RETRY_MASK | TX_BD_UR) | |
141 | ||
142 | /* RX buffer descriptor */ | |
143 | #define RX_BD_LC (1 << 0) /* late collision */ | |
144 | #define RX_BD_CRC (1 << 1) /* RX CRC error */ | |
145 | #define RX_BD_SF (1 << 2) /* short frame */ | |
146 | #define RX_BD_TL (1 << 3) /* too long */ | |
147 | #define RX_BD_DN (1 << 4) /* dribble nibble */ | |
148 | #define RX_BD_IS (1 << 5) /* invalid symbol */ | |
149 | #define RX_BD_OR (1 << 6) /* receiver overrun */ | |
150 | #define RX_BD_MISS (1 << 7) | |
151 | #define RX_BD_CF (1 << 8) /* control frame */ | |
152 | #define RX_BD_WRAP (1 << 13) | |
153 | #define RX_BD_IRQ (1 << 14) /* interrupt request enable */ | |
154 | #define RX_BD_EMPTY (1 << 15) | |
155 | #define RX_BD_LEN(x) (((x) & 0xffff) << 16) | |
156 | ||
157 | #define RX_BD_STATS (RX_BD_LC | RX_BD_CRC | RX_BD_SF | RX_BD_TL | \ | |
158 | RX_BD_DN | RX_BD_IS | RX_BD_OR | RX_BD_MISS) | |
159 | ||
160 | #define ETHOC_BUFSIZ 1536 | |
161 | #define ETHOC_ZLEN 64 | |
162 | #define ETHOC_BD_BASE 0x400 | |
163 | #define ETHOC_TIMEOUT (HZ / 2) | |
164 | #define ETHOC_MII_TIMEOUT (1 + (HZ / 5)) | |
165 | ||
166 | /** | |
167 | * struct ethoc - driver-private device structure | |
168 | * @iobase: pointer to I/O memory region | |
169 | * @membase: pointer to buffer memory region | |
170 | * @num_tx: number of send buffers | |
171 | * @cur_tx: last send buffer written | |
172 | * @dty_tx: last buffer actually sent | |
173 | * @num_rx: number of receive buffers | |
174 | * @cur_rx: current receive buffer | |
175 | * @netdev: pointer to network device structure | |
176 | * @napi: NAPI structure | |
177 | * @stats: network device statistics | |
178 | * @msg_enable: device state flags | |
179 | * @rx_lock: receive lock | |
180 | * @lock: device lock | |
181 | * @phy: attached PHY | |
182 | * @mdio: MDIO bus for PHY access | |
183 | * @phy_id: address of attached PHY | |
184 | */ | |
185 | struct ethoc { | |
186 | void __iomem *iobase; | |
187 | void __iomem *membase; | |
188 | ||
189 | unsigned int num_tx; | |
190 | unsigned int cur_tx; | |
191 | unsigned int dty_tx; | |
192 | ||
193 | unsigned int num_rx; | |
194 | unsigned int cur_rx; | |
195 | ||
196 | struct net_device *netdev; | |
197 | struct napi_struct napi; | |
198 | struct net_device_stats stats; | |
199 | u32 msg_enable; | |
200 | ||
201 | spinlock_t rx_lock; | |
202 | spinlock_t lock; | |
203 | ||
204 | struct phy_device *phy; | |
205 | struct mii_bus *mdio; | |
206 | s8 phy_id; | |
207 | }; | |
208 | ||
209 | /** | |
210 | * struct ethoc_bd - buffer descriptor | |
211 | * @stat: buffer statistics | |
212 | * @addr: physical memory address | |
213 | */ | |
214 | struct ethoc_bd { | |
215 | u32 stat; | |
216 | u32 addr; | |
217 | }; | |
218 | ||
219 | static u32 ethoc_read(struct ethoc *dev, loff_t offset) | |
220 | { | |
221 | return ioread32(dev->iobase + offset); | |
222 | } | |
223 | ||
224 | static void ethoc_write(struct ethoc *dev, loff_t offset, u32 data) | |
225 | { | |
226 | iowrite32(data, dev->iobase + offset); | |
227 | } | |
228 | ||
229 | static void ethoc_read_bd(struct ethoc *dev, int index, struct ethoc_bd *bd) | |
230 | { | |
231 | loff_t offset = ETHOC_BD_BASE + (index * sizeof(struct ethoc_bd)); | |
232 | bd->stat = ethoc_read(dev, offset + 0); | |
233 | bd->addr = ethoc_read(dev, offset + 4); | |
234 | } | |
235 | ||
236 | static void ethoc_write_bd(struct ethoc *dev, int index, | |
237 | const struct ethoc_bd *bd) | |
238 | { | |
239 | loff_t offset = ETHOC_BD_BASE + (index * sizeof(struct ethoc_bd)); | |
240 | ethoc_write(dev, offset + 0, bd->stat); | |
241 | ethoc_write(dev, offset + 4, bd->addr); | |
242 | } | |
243 | ||
244 | static void ethoc_enable_irq(struct ethoc *dev, u32 mask) | |
245 | { | |
246 | u32 imask = ethoc_read(dev, INT_MASK); | |
247 | imask |= mask; | |
248 | ethoc_write(dev, INT_MASK, imask); | |
249 | } | |
250 | ||
251 | static void ethoc_disable_irq(struct ethoc *dev, u32 mask) | |
252 | { | |
253 | u32 imask = ethoc_read(dev, INT_MASK); | |
254 | imask &= ~mask; | |
255 | ethoc_write(dev, INT_MASK, imask); | |
256 | } | |
257 | ||
258 | static void ethoc_ack_irq(struct ethoc *dev, u32 mask) | |
259 | { | |
260 | ethoc_write(dev, INT_SOURCE, mask); | |
261 | } | |
262 | ||
263 | static void ethoc_enable_rx_and_tx(struct ethoc *dev) | |
264 | { | |
265 | u32 mode = ethoc_read(dev, MODER); | |
266 | mode |= MODER_RXEN | MODER_TXEN; | |
267 | ethoc_write(dev, MODER, mode); | |
268 | } | |
269 | ||
270 | static void ethoc_disable_rx_and_tx(struct ethoc *dev) | |
271 | { | |
272 | u32 mode = ethoc_read(dev, MODER); | |
273 | mode &= ~(MODER_RXEN | MODER_TXEN); | |
274 | ethoc_write(dev, MODER, mode); | |
275 | } | |
276 | ||
277 | static int ethoc_init_ring(struct ethoc *dev) | |
278 | { | |
279 | struct ethoc_bd bd; | |
280 | int i; | |
281 | ||
282 | dev->cur_tx = 0; | |
283 | dev->dty_tx = 0; | |
284 | dev->cur_rx = 0; | |
285 | ||
286 | /* setup transmission buffers */ | |
287 | bd.addr = 0; | |
288 | bd.stat = TX_BD_IRQ | TX_BD_CRC; | |
289 | ||
290 | for (i = 0; i < dev->num_tx; i++) { | |
291 | if (i == dev->num_tx - 1) | |
292 | bd.stat |= TX_BD_WRAP; | |
293 | ||
294 | ethoc_write_bd(dev, i, &bd); | |
295 | bd.addr += ETHOC_BUFSIZ; | |
296 | } | |
297 | ||
298 | bd.addr = dev->num_tx * ETHOC_BUFSIZ; | |
299 | bd.stat = RX_BD_EMPTY | RX_BD_IRQ; | |
300 | ||
301 | for (i = 0; i < dev->num_rx; i++) { | |
302 | if (i == dev->num_rx - 1) | |
303 | bd.stat |= RX_BD_WRAP; | |
304 | ||
305 | ethoc_write_bd(dev, dev->num_tx + i, &bd); | |
306 | bd.addr += ETHOC_BUFSIZ; | |
307 | } | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | static int ethoc_reset(struct ethoc *dev) | |
313 | { | |
314 | u32 mode; | |
315 | ||
316 | /* TODO: reset controller? */ | |
317 | ||
318 | ethoc_disable_rx_and_tx(dev); | |
319 | ||
320 | /* TODO: setup registers */ | |
321 | ||
322 | /* enable FCS generation and automatic padding */ | |
323 | mode = ethoc_read(dev, MODER); | |
324 | mode |= MODER_CRC | MODER_PAD; | |
325 | ethoc_write(dev, MODER, mode); | |
326 | ||
327 | /* set full-duplex mode */ | |
328 | mode = ethoc_read(dev, MODER); | |
329 | mode |= MODER_FULLD; | |
330 | ethoc_write(dev, MODER, mode); | |
331 | ethoc_write(dev, IPGT, 0x15); | |
332 | ||
333 | ethoc_ack_irq(dev, INT_MASK_ALL); | |
334 | ethoc_enable_irq(dev, INT_MASK_ALL); | |
335 | ethoc_enable_rx_and_tx(dev); | |
336 | return 0; | |
337 | } | |
338 | ||
339 | static unsigned int ethoc_update_rx_stats(struct ethoc *dev, | |
340 | struct ethoc_bd *bd) | |
341 | { | |
342 | struct net_device *netdev = dev->netdev; | |
343 | unsigned int ret = 0; | |
344 | ||
345 | if (bd->stat & RX_BD_TL) { | |
346 | dev_err(&netdev->dev, "RX: frame too long\n"); | |
347 | dev->stats.rx_length_errors++; | |
348 | ret++; | |
349 | } | |
350 | ||
351 | if (bd->stat & RX_BD_SF) { | |
352 | dev_err(&netdev->dev, "RX: frame too short\n"); | |
353 | dev->stats.rx_length_errors++; | |
354 | ret++; | |
355 | } | |
356 | ||
357 | if (bd->stat & RX_BD_DN) { | |
358 | dev_err(&netdev->dev, "RX: dribble nibble\n"); | |
359 | dev->stats.rx_frame_errors++; | |
360 | } | |
361 | ||
362 | if (bd->stat & RX_BD_CRC) { | |
363 | dev_err(&netdev->dev, "RX: wrong CRC\n"); | |
364 | dev->stats.rx_crc_errors++; | |
365 | ret++; | |
366 | } | |
367 | ||
368 | if (bd->stat & RX_BD_OR) { | |
369 | dev_err(&netdev->dev, "RX: overrun\n"); | |
370 | dev->stats.rx_over_errors++; | |
371 | ret++; | |
372 | } | |
373 | ||
374 | if (bd->stat & RX_BD_MISS) | |
375 | dev->stats.rx_missed_errors++; | |
376 | ||
377 | if (bd->stat & RX_BD_LC) { | |
378 | dev_err(&netdev->dev, "RX: late collision\n"); | |
379 | dev->stats.collisions++; | |
380 | ret++; | |
381 | } | |
382 | ||
383 | return ret; | |
384 | } | |
385 | ||
386 | static int ethoc_rx(struct net_device *dev, int limit) | |
387 | { | |
388 | struct ethoc *priv = netdev_priv(dev); | |
389 | int count; | |
390 | ||
391 | for (count = 0; count < limit; ++count) { | |
392 | unsigned int entry; | |
393 | struct ethoc_bd bd; | |
394 | ||
395 | entry = priv->num_tx + (priv->cur_rx % priv->num_rx); | |
396 | ethoc_read_bd(priv, entry, &bd); | |
397 | if (bd.stat & RX_BD_EMPTY) | |
398 | break; | |
399 | ||
400 | if (ethoc_update_rx_stats(priv, &bd) == 0) { | |
401 | int size = bd.stat >> 16; | |
402 | struct sk_buff *skb = netdev_alloc_skb(dev, size); | |
403 | if (likely(skb)) { | |
404 | void *src = priv->membase + bd.addr; | |
405 | memcpy_fromio(skb_put(skb, size), src, size); | |
406 | skb->protocol = eth_type_trans(skb, dev); | |
407 | dev->last_rx = jiffies; | |
408 | priv->stats.rx_packets++; | |
409 | priv->stats.rx_bytes += size; | |
410 | netif_receive_skb(skb); | |
411 | } else { | |
412 | if (net_ratelimit()) | |
413 | dev_warn(&dev->dev, "low on memory - " | |
414 | "packet dropped\n"); | |
415 | ||
416 | priv->stats.rx_dropped++; | |
417 | break; | |
418 | } | |
419 | } | |
420 | ||
421 | /* clear the buffer descriptor so it can be reused */ | |
422 | bd.stat &= ~RX_BD_STATS; | |
423 | bd.stat |= RX_BD_EMPTY; | |
424 | ethoc_write_bd(priv, entry, &bd); | |
425 | priv->cur_rx++; | |
426 | } | |
427 | ||
428 | return count; | |
429 | } | |
430 | ||
431 | static int ethoc_update_tx_stats(struct ethoc *dev, struct ethoc_bd *bd) | |
432 | { | |
433 | struct net_device *netdev = dev->netdev; | |
434 | ||
435 | if (bd->stat & TX_BD_LC) { | |
436 | dev_err(&netdev->dev, "TX: late collision\n"); | |
437 | dev->stats.tx_window_errors++; | |
438 | } | |
439 | ||
440 | if (bd->stat & TX_BD_RL) { | |
441 | dev_err(&netdev->dev, "TX: retransmit limit\n"); | |
442 | dev->stats.tx_aborted_errors++; | |
443 | } | |
444 | ||
445 | if (bd->stat & TX_BD_UR) { | |
446 | dev_err(&netdev->dev, "TX: underrun\n"); | |
447 | dev->stats.tx_fifo_errors++; | |
448 | } | |
449 | ||
450 | if (bd->stat & TX_BD_CS) { | |
451 | dev_err(&netdev->dev, "TX: carrier sense lost\n"); | |
452 | dev->stats.tx_carrier_errors++; | |
453 | } | |
454 | ||
455 | if (bd->stat & TX_BD_STATS) | |
456 | dev->stats.tx_errors++; | |
457 | ||
458 | dev->stats.collisions += (bd->stat >> 4) & 0xf; | |
459 | dev->stats.tx_bytes += bd->stat >> 16; | |
460 | dev->stats.tx_packets++; | |
461 | return 0; | |
462 | } | |
463 | ||
464 | static void ethoc_tx(struct net_device *dev) | |
465 | { | |
466 | struct ethoc *priv = netdev_priv(dev); | |
467 | ||
468 | spin_lock(&priv->lock); | |
469 | ||
470 | while (priv->dty_tx != priv->cur_tx) { | |
471 | unsigned int entry = priv->dty_tx % priv->num_tx; | |
472 | struct ethoc_bd bd; | |
473 | ||
474 | ethoc_read_bd(priv, entry, &bd); | |
475 | if (bd.stat & TX_BD_READY) | |
476 | break; | |
477 | ||
478 | entry = (++priv->dty_tx) % priv->num_tx; | |
479 | (void)ethoc_update_tx_stats(priv, &bd); | |
480 | } | |
481 | ||
482 | if ((priv->cur_tx - priv->dty_tx) <= (priv->num_tx / 2)) | |
483 | netif_wake_queue(dev); | |
484 | ||
485 | ethoc_ack_irq(priv, INT_MASK_TX); | |
486 | spin_unlock(&priv->lock); | |
487 | } | |
488 | ||
489 | static irqreturn_t ethoc_interrupt(int irq, void *dev_id) | |
490 | { | |
491 | struct net_device *dev = (struct net_device *)dev_id; | |
492 | struct ethoc *priv = netdev_priv(dev); | |
493 | u32 pending; | |
494 | ||
495 | ethoc_disable_irq(priv, INT_MASK_ALL); | |
496 | pending = ethoc_read(priv, INT_SOURCE); | |
497 | if (unlikely(pending == 0)) { | |
498 | ethoc_enable_irq(priv, INT_MASK_ALL); | |
499 | return IRQ_NONE; | |
500 | } | |
501 | ||
502 | ethoc_ack_irq(priv, INT_MASK_ALL); | |
503 | ||
504 | if (pending & INT_MASK_BUSY) { | |
505 | dev_err(&dev->dev, "packet dropped\n"); | |
506 | priv->stats.rx_dropped++; | |
507 | } | |
508 | ||
509 | if (pending & INT_MASK_RX) { | |
510 | if (napi_schedule_prep(&priv->napi)) | |
511 | __napi_schedule(&priv->napi); | |
512 | } else { | |
513 | ethoc_enable_irq(priv, INT_MASK_RX); | |
514 | } | |
515 | ||
516 | if (pending & INT_MASK_TX) | |
517 | ethoc_tx(dev); | |
518 | ||
519 | ethoc_enable_irq(priv, INT_MASK_ALL & ~INT_MASK_RX); | |
520 | return IRQ_HANDLED; | |
521 | } | |
522 | ||
523 | static int ethoc_get_mac_address(struct net_device *dev, void *addr) | |
524 | { | |
525 | struct ethoc *priv = netdev_priv(dev); | |
526 | u8 *mac = (u8 *)addr; | |
527 | u32 reg; | |
528 | ||
529 | reg = ethoc_read(priv, MAC_ADDR0); | |
530 | mac[2] = (reg >> 24) & 0xff; | |
531 | mac[3] = (reg >> 16) & 0xff; | |
532 | mac[4] = (reg >> 8) & 0xff; | |
533 | mac[5] = (reg >> 0) & 0xff; | |
534 | ||
535 | reg = ethoc_read(priv, MAC_ADDR1); | |
536 | mac[0] = (reg >> 8) & 0xff; | |
537 | mac[1] = (reg >> 0) & 0xff; | |
538 | ||
539 | return 0; | |
540 | } | |
541 | ||
542 | static int ethoc_poll(struct napi_struct *napi, int budget) | |
543 | { | |
544 | struct ethoc *priv = container_of(napi, struct ethoc, napi); | |
545 | int work_done = 0; | |
546 | ||
547 | work_done = ethoc_rx(priv->netdev, budget); | |
548 | if (work_done < budget) { | |
549 | ethoc_enable_irq(priv, INT_MASK_RX); | |
550 | napi_complete(napi); | |
551 | } | |
552 | ||
553 | return work_done; | |
554 | } | |
555 | ||
556 | static int ethoc_mdio_read(struct mii_bus *bus, int phy, int reg) | |
557 | { | |
558 | unsigned long timeout = jiffies + ETHOC_MII_TIMEOUT; | |
559 | struct ethoc *priv = bus->priv; | |
560 | ||
561 | ethoc_write(priv, MIIADDRESS, MIIADDRESS_ADDR(phy, reg)); | |
562 | ethoc_write(priv, MIICOMMAND, MIICOMMAND_READ); | |
563 | ||
564 | while (time_before(jiffies, timeout)) { | |
565 | u32 status = ethoc_read(priv, MIISTATUS); | |
566 | if (!(status & MIISTATUS_BUSY)) { | |
567 | u32 data = ethoc_read(priv, MIIRX_DATA); | |
568 | /* reset MII command register */ | |
569 | ethoc_write(priv, MIICOMMAND, 0); | |
570 | return data; | |
571 | } | |
572 | ||
573 | schedule(); | |
574 | } | |
575 | ||
576 | return -EBUSY; | |
577 | } | |
578 | ||
579 | static int ethoc_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val) | |
580 | { | |
581 | unsigned long timeout = jiffies + ETHOC_MII_TIMEOUT; | |
582 | struct ethoc *priv = bus->priv; | |
583 | ||
584 | ethoc_write(priv, MIIADDRESS, MIIADDRESS_ADDR(phy, reg)); | |
585 | ethoc_write(priv, MIITX_DATA, val); | |
586 | ethoc_write(priv, MIICOMMAND, MIICOMMAND_WRITE); | |
587 | ||
588 | while (time_before(jiffies, timeout)) { | |
589 | u32 stat = ethoc_read(priv, MIISTATUS); | |
590 | if (!(stat & MIISTATUS_BUSY)) | |
591 | return 0; | |
592 | ||
593 | schedule(); | |
594 | } | |
595 | ||
596 | return -EBUSY; | |
597 | } | |
598 | ||
599 | static int ethoc_mdio_reset(struct mii_bus *bus) | |
600 | { | |
601 | return 0; | |
602 | } | |
603 | ||
604 | static void ethoc_mdio_poll(struct net_device *dev) | |
605 | { | |
606 | } | |
607 | ||
608 | static int ethoc_mdio_probe(struct net_device *dev) | |
609 | { | |
610 | struct ethoc *priv = netdev_priv(dev); | |
611 | struct phy_device *phy; | |
612 | int i; | |
613 | ||
614 | for (i = 0; i < PHY_MAX_ADDR; i++) { | |
615 | phy = priv->mdio->phy_map[i]; | |
616 | if (phy) { | |
617 | if (priv->phy_id != -1) { | |
618 | /* attach to specified PHY */ | |
619 | if (priv->phy_id == phy->addr) | |
620 | break; | |
621 | } else { | |
622 | /* autoselect PHY if none was specified */ | |
623 | if (phy->addr != 0) | |
624 | break; | |
625 | } | |
626 | } | |
627 | } | |
628 | ||
629 | if (!phy) { | |
630 | dev_err(&dev->dev, "no PHY found\n"); | |
631 | return -ENXIO; | |
632 | } | |
633 | ||
634 | phy = phy_connect(dev, dev_name(&phy->dev), ðoc_mdio_poll, 0, | |
635 | PHY_INTERFACE_MODE_GMII); | |
636 | if (IS_ERR(phy)) { | |
637 | dev_err(&dev->dev, "could not attach to PHY\n"); | |
638 | return PTR_ERR(phy); | |
639 | } | |
640 | ||
641 | priv->phy = phy; | |
642 | return 0; | |
643 | } | |
644 | ||
645 | static int ethoc_open(struct net_device *dev) | |
646 | { | |
647 | struct ethoc *priv = netdev_priv(dev); | |
648 | unsigned int min_tx = 2; | |
649 | unsigned int num_bd; | |
650 | int ret; | |
651 | ||
652 | ret = request_irq(dev->irq, ethoc_interrupt, IRQF_SHARED, | |
653 | dev->name, dev); | |
654 | if (ret) | |
655 | return ret; | |
656 | ||
657 | /* calculate the number of TX/RX buffers */ | |
658 | num_bd = (dev->mem_end - dev->mem_start + 1) / ETHOC_BUFSIZ; | |
659 | priv->num_tx = min(min_tx, num_bd / 4); | |
660 | priv->num_rx = num_bd - priv->num_tx; | |
661 | ethoc_write(priv, TX_BD_NUM, priv->num_tx); | |
662 | ||
663 | ethoc_init_ring(priv); | |
664 | ethoc_reset(priv); | |
665 | ||
666 | if (netif_queue_stopped(dev)) { | |
667 | dev_dbg(&dev->dev, " resuming queue\n"); | |
668 | netif_wake_queue(dev); | |
669 | } else { | |
670 | dev_dbg(&dev->dev, " starting queue\n"); | |
671 | netif_start_queue(dev); | |
672 | } | |
673 | ||
674 | phy_start(priv->phy); | |
675 | napi_enable(&priv->napi); | |
676 | ||
677 | if (netif_msg_ifup(priv)) { | |
678 | dev_info(&dev->dev, "I/O: %08lx Memory: %08lx-%08lx\n", | |
679 | dev->base_addr, dev->mem_start, dev->mem_end); | |
680 | } | |
681 | ||
682 | return 0; | |
683 | } | |
684 | ||
685 | static int ethoc_stop(struct net_device *dev) | |
686 | { | |
687 | struct ethoc *priv = netdev_priv(dev); | |
688 | ||
689 | napi_disable(&priv->napi); | |
690 | ||
691 | if (priv->phy) | |
692 | phy_stop(priv->phy); | |
693 | ||
694 | ethoc_disable_rx_and_tx(priv); | |
695 | free_irq(dev->irq, dev); | |
696 | ||
697 | if (!netif_queue_stopped(dev)) | |
698 | netif_stop_queue(dev); | |
699 | ||
700 | return 0; | |
701 | } | |
702 | ||
703 | static int ethoc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
704 | { | |
705 | struct ethoc *priv = netdev_priv(dev); | |
706 | struct mii_ioctl_data *mdio = if_mii(ifr); | |
707 | struct phy_device *phy = NULL; | |
708 | ||
709 | if (!netif_running(dev)) | |
710 | return -EINVAL; | |
711 | ||
712 | if (cmd != SIOCGMIIPHY) { | |
713 | if (mdio->phy_id >= PHY_MAX_ADDR) | |
714 | return -ERANGE; | |
715 | ||
716 | phy = priv->mdio->phy_map[mdio->phy_id]; | |
717 | if (!phy) | |
718 | return -ENODEV; | |
719 | } else { | |
720 | phy = priv->phy; | |
721 | } | |
722 | ||
723 | return phy_mii_ioctl(phy, mdio, cmd); | |
724 | } | |
725 | ||
726 | static int ethoc_config(struct net_device *dev, struct ifmap *map) | |
727 | { | |
728 | return -ENOSYS; | |
729 | } | |
730 | ||
731 | static int ethoc_set_mac_address(struct net_device *dev, void *addr) | |
732 | { | |
733 | struct ethoc *priv = netdev_priv(dev); | |
734 | u8 *mac = (u8 *)addr; | |
735 | ||
736 | ethoc_write(priv, MAC_ADDR0, (mac[2] << 24) | (mac[3] << 16) | | |
737 | (mac[4] << 8) | (mac[5] << 0)); | |
738 | ethoc_write(priv, MAC_ADDR1, (mac[0] << 8) | (mac[1] << 0)); | |
739 | ||
740 | return 0; | |
741 | } | |
742 | ||
743 | static void ethoc_set_multicast_list(struct net_device *dev) | |
744 | { | |
745 | struct ethoc *priv = netdev_priv(dev); | |
746 | u32 mode = ethoc_read(priv, MODER); | |
747 | struct dev_mc_list *mc = NULL; | |
748 | u32 hash[2] = { 0, 0 }; | |
749 | ||
750 | /* set loopback mode if requested */ | |
751 | if (dev->flags & IFF_LOOPBACK) | |
752 | mode |= MODER_LOOP; | |
753 | else | |
754 | mode &= ~MODER_LOOP; | |
755 | ||
756 | /* receive broadcast frames if requested */ | |
757 | if (dev->flags & IFF_BROADCAST) | |
758 | mode &= ~MODER_BRO; | |
759 | else | |
760 | mode |= MODER_BRO; | |
761 | ||
762 | /* enable promiscuous mode if requested */ | |
763 | if (dev->flags & IFF_PROMISC) | |
764 | mode |= MODER_PRO; | |
765 | else | |
766 | mode &= ~MODER_PRO; | |
767 | ||
768 | ethoc_write(priv, MODER, mode); | |
769 | ||
770 | /* receive multicast frames */ | |
771 | if (dev->flags & IFF_ALLMULTI) { | |
772 | hash[0] = 0xffffffff; | |
773 | hash[1] = 0xffffffff; | |
774 | } else { | |
775 | for (mc = dev->mc_list; mc; mc = mc->next) { | |
776 | u32 crc = ether_crc(mc->dmi_addrlen, mc->dmi_addr); | |
777 | int bit = (crc >> 26) & 0x3f; | |
778 | hash[bit >> 5] |= 1 << (bit & 0x1f); | |
779 | } | |
780 | } | |
781 | ||
782 | ethoc_write(priv, ETH_HASH0, hash[0]); | |
783 | ethoc_write(priv, ETH_HASH1, hash[1]); | |
784 | } | |
785 | ||
786 | static int ethoc_change_mtu(struct net_device *dev, int new_mtu) | |
787 | { | |
788 | return -ENOSYS; | |
789 | } | |
790 | ||
791 | static void ethoc_tx_timeout(struct net_device *dev) | |
792 | { | |
793 | struct ethoc *priv = netdev_priv(dev); | |
794 | u32 pending = ethoc_read(priv, INT_SOURCE); | |
795 | if (likely(pending)) | |
796 | ethoc_interrupt(dev->irq, dev); | |
797 | } | |
798 | ||
799 | static struct net_device_stats *ethoc_stats(struct net_device *dev) | |
800 | { | |
801 | struct ethoc *priv = netdev_priv(dev); | |
802 | return &priv->stats; | |
803 | } | |
804 | ||
805 | static int ethoc_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
806 | { | |
807 | struct ethoc *priv = netdev_priv(dev); | |
808 | struct ethoc_bd bd; | |
809 | unsigned int entry; | |
810 | void *dest; | |
811 | ||
812 | if (unlikely(skb->len > ETHOC_BUFSIZ)) { | |
813 | priv->stats.tx_errors++; | |
3790c8cd | 814 | goto out; |
a1702857 TR |
815 | } |
816 | ||
817 | entry = priv->cur_tx % priv->num_tx; | |
818 | spin_lock_irq(&priv->lock); | |
819 | priv->cur_tx++; | |
820 | ||
821 | ethoc_read_bd(priv, entry, &bd); | |
822 | if (unlikely(skb->len < ETHOC_ZLEN)) | |
823 | bd.stat |= TX_BD_PAD; | |
824 | else | |
825 | bd.stat &= ~TX_BD_PAD; | |
826 | ||
827 | dest = priv->membase + bd.addr; | |
828 | memcpy_toio(dest, skb->data, skb->len); | |
829 | ||
830 | bd.stat &= ~(TX_BD_STATS | TX_BD_LEN_MASK); | |
831 | bd.stat |= TX_BD_LEN(skb->len); | |
832 | ethoc_write_bd(priv, entry, &bd); | |
833 | ||
834 | bd.stat |= TX_BD_READY; | |
835 | ethoc_write_bd(priv, entry, &bd); | |
836 | ||
837 | if (priv->cur_tx == (priv->dty_tx + priv->num_tx)) { | |
838 | dev_dbg(&dev->dev, "stopping queue\n"); | |
839 | netif_stop_queue(dev); | |
840 | } | |
841 | ||
842 | dev->trans_start = jiffies; | |
a1702857 | 843 | spin_unlock_irq(&priv->lock); |
3790c8cd PM |
844 | out: |
845 | dev_kfree_skb(skb); | |
a1702857 TR |
846 | return NETDEV_TX_OK; |
847 | } | |
848 | ||
849 | static const struct net_device_ops ethoc_netdev_ops = { | |
850 | .ndo_open = ethoc_open, | |
851 | .ndo_stop = ethoc_stop, | |
852 | .ndo_do_ioctl = ethoc_ioctl, | |
853 | .ndo_set_config = ethoc_config, | |
854 | .ndo_set_mac_address = ethoc_set_mac_address, | |
855 | .ndo_set_multicast_list = ethoc_set_multicast_list, | |
856 | .ndo_change_mtu = ethoc_change_mtu, | |
857 | .ndo_tx_timeout = ethoc_tx_timeout, | |
858 | .ndo_get_stats = ethoc_stats, | |
859 | .ndo_start_xmit = ethoc_start_xmit, | |
860 | }; | |
861 | ||
862 | /** | |
863 | * ethoc_probe() - initialize OpenCores ethernet MAC | |
864 | * pdev: platform device | |
865 | */ | |
866 | static int ethoc_probe(struct platform_device *pdev) | |
867 | { | |
868 | struct net_device *netdev = NULL; | |
869 | struct resource *res = NULL; | |
870 | struct resource *mmio = NULL; | |
871 | struct resource *mem = NULL; | |
872 | struct ethoc *priv = NULL; | |
873 | unsigned int phy; | |
874 | int ret = 0; | |
875 | ||
876 | /* allocate networking device */ | |
877 | netdev = alloc_etherdev(sizeof(struct ethoc)); | |
878 | if (!netdev) { | |
879 | dev_err(&pdev->dev, "cannot allocate network device\n"); | |
880 | ret = -ENOMEM; | |
881 | goto out; | |
882 | } | |
883 | ||
884 | SET_NETDEV_DEV(netdev, &pdev->dev); | |
885 | platform_set_drvdata(pdev, netdev); | |
886 | ||
887 | /* obtain I/O memory space */ | |
888 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
889 | if (!res) { | |
890 | dev_err(&pdev->dev, "cannot obtain I/O memory space\n"); | |
891 | ret = -ENXIO; | |
892 | goto free; | |
893 | } | |
894 | ||
895 | mmio = devm_request_mem_region(&pdev->dev, res->start, | |
896 | res->end - res->start + 1, res->name); | |
897 | if (!res) { | |
898 | dev_err(&pdev->dev, "cannot request I/O memory space\n"); | |
899 | ret = -ENXIO; | |
900 | goto free; | |
901 | } | |
902 | ||
903 | netdev->base_addr = mmio->start; | |
904 | ||
905 | /* obtain buffer memory space */ | |
906 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
907 | if (!res) { | |
908 | dev_err(&pdev->dev, "cannot obtain memory space\n"); | |
909 | ret = -ENXIO; | |
910 | goto free; | |
911 | } | |
912 | ||
913 | mem = devm_request_mem_region(&pdev->dev, res->start, | |
914 | res->end - res->start + 1, res->name); | |
915 | if (!mem) { | |
916 | dev_err(&pdev->dev, "cannot request memory space\n"); | |
917 | ret = -ENXIO; | |
918 | goto free; | |
919 | } | |
920 | ||
921 | netdev->mem_start = mem->start; | |
922 | netdev->mem_end = mem->end; | |
923 | ||
924 | /* obtain device IRQ number */ | |
925 | res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
926 | if (!res) { | |
927 | dev_err(&pdev->dev, "cannot obtain IRQ\n"); | |
928 | ret = -ENXIO; | |
929 | goto free; | |
930 | } | |
931 | ||
932 | netdev->irq = res->start; | |
933 | ||
934 | /* setup driver-private data */ | |
935 | priv = netdev_priv(netdev); | |
936 | priv->netdev = netdev; | |
937 | ||
938 | priv->iobase = devm_ioremap_nocache(&pdev->dev, netdev->base_addr, | |
939 | mmio->end - mmio->start + 1); | |
940 | if (!priv->iobase) { | |
941 | dev_err(&pdev->dev, "cannot remap I/O memory space\n"); | |
942 | ret = -ENXIO; | |
943 | goto error; | |
944 | } | |
945 | ||
946 | priv->membase = devm_ioremap_nocache(&pdev->dev, netdev->mem_start, | |
947 | mem->end - mem->start + 1); | |
948 | if (!priv->membase) { | |
949 | dev_err(&pdev->dev, "cannot remap memory space\n"); | |
950 | ret = -ENXIO; | |
951 | goto error; | |
952 | } | |
953 | ||
954 | /* Allow the platform setup code to pass in a MAC address. */ | |
955 | if (pdev->dev.platform_data) { | |
956 | struct ethoc_platform_data *pdata = | |
957 | (struct ethoc_platform_data *)pdev->dev.platform_data; | |
958 | memcpy(netdev->dev_addr, pdata->hwaddr, IFHWADDRLEN); | |
959 | priv->phy_id = pdata->phy_id; | |
960 | } | |
961 | ||
962 | /* Check that the given MAC address is valid. If it isn't, read the | |
963 | * current MAC from the controller. */ | |
964 | if (!is_valid_ether_addr(netdev->dev_addr)) | |
965 | ethoc_get_mac_address(netdev, netdev->dev_addr); | |
966 | ||
967 | /* Check the MAC again for validity, if it still isn't choose and | |
968 | * program a random one. */ | |
969 | if (!is_valid_ether_addr(netdev->dev_addr)) | |
970 | random_ether_addr(netdev->dev_addr); | |
971 | ||
972 | ethoc_set_mac_address(netdev, netdev->dev_addr); | |
973 | ||
974 | /* register MII bus */ | |
975 | priv->mdio = mdiobus_alloc(); | |
976 | if (!priv->mdio) { | |
977 | ret = -ENOMEM; | |
978 | goto free; | |
979 | } | |
980 | ||
981 | priv->mdio->name = "ethoc-mdio"; | |
982 | snprintf(priv->mdio->id, MII_BUS_ID_SIZE, "%s-%d", | |
983 | priv->mdio->name, pdev->id); | |
984 | priv->mdio->read = ethoc_mdio_read; | |
985 | priv->mdio->write = ethoc_mdio_write; | |
986 | priv->mdio->reset = ethoc_mdio_reset; | |
987 | priv->mdio->priv = priv; | |
988 | ||
989 | priv->mdio->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL); | |
990 | if (!priv->mdio->irq) { | |
991 | ret = -ENOMEM; | |
992 | goto free_mdio; | |
993 | } | |
994 | ||
995 | for (phy = 0; phy < PHY_MAX_ADDR; phy++) | |
996 | priv->mdio->irq[phy] = PHY_POLL; | |
997 | ||
998 | ret = mdiobus_register(priv->mdio); | |
999 | if (ret) { | |
1000 | dev_err(&netdev->dev, "failed to register MDIO bus\n"); | |
1001 | goto free_mdio; | |
1002 | } | |
1003 | ||
1004 | ret = ethoc_mdio_probe(netdev); | |
1005 | if (ret) { | |
1006 | dev_err(&netdev->dev, "failed to probe MDIO bus\n"); | |
1007 | goto error; | |
1008 | } | |
1009 | ||
1010 | ether_setup(netdev); | |
1011 | ||
1012 | /* setup the net_device structure */ | |
1013 | netdev->netdev_ops = ðoc_netdev_ops; | |
1014 | netdev->watchdog_timeo = ETHOC_TIMEOUT; | |
1015 | netdev->features |= 0; | |
1016 | ||
1017 | /* setup NAPI */ | |
1018 | memset(&priv->napi, 0, sizeof(priv->napi)); | |
1019 | netif_napi_add(netdev, &priv->napi, ethoc_poll, 64); | |
1020 | ||
1021 | spin_lock_init(&priv->rx_lock); | |
1022 | spin_lock_init(&priv->lock); | |
1023 | ||
1024 | ret = register_netdev(netdev); | |
1025 | if (ret < 0) { | |
1026 | dev_err(&netdev->dev, "failed to register interface\n"); | |
1027 | goto error; | |
1028 | } | |
1029 | ||
1030 | goto out; | |
1031 | ||
1032 | error: | |
1033 | mdiobus_unregister(priv->mdio); | |
1034 | free_mdio: | |
1035 | kfree(priv->mdio->irq); | |
1036 | mdiobus_free(priv->mdio); | |
1037 | free: | |
1038 | free_netdev(netdev); | |
1039 | out: | |
1040 | return ret; | |
1041 | } | |
1042 | ||
1043 | /** | |
1044 | * ethoc_remove() - shutdown OpenCores ethernet MAC | |
1045 | * @pdev: platform device | |
1046 | */ | |
1047 | static int ethoc_remove(struct platform_device *pdev) | |
1048 | { | |
1049 | struct net_device *netdev = platform_get_drvdata(pdev); | |
1050 | struct ethoc *priv = netdev_priv(netdev); | |
1051 | ||
1052 | platform_set_drvdata(pdev, NULL); | |
1053 | ||
1054 | if (netdev) { | |
1055 | phy_disconnect(priv->phy); | |
1056 | priv->phy = NULL; | |
1057 | ||
1058 | if (priv->mdio) { | |
1059 | mdiobus_unregister(priv->mdio); | |
1060 | kfree(priv->mdio->irq); | |
1061 | mdiobus_free(priv->mdio); | |
1062 | } | |
1063 | ||
1064 | unregister_netdev(netdev); | |
1065 | free_netdev(netdev); | |
1066 | } | |
1067 | ||
1068 | return 0; | |
1069 | } | |
1070 | ||
1071 | #ifdef CONFIG_PM | |
1072 | static int ethoc_suspend(struct platform_device *pdev, pm_message_t state) | |
1073 | { | |
1074 | return -ENOSYS; | |
1075 | } | |
1076 | ||
1077 | static int ethoc_resume(struct platform_device *pdev) | |
1078 | { | |
1079 | return -ENOSYS; | |
1080 | } | |
1081 | #else | |
1082 | # define ethoc_suspend NULL | |
1083 | # define ethoc_resume NULL | |
1084 | #endif | |
1085 | ||
1086 | static struct platform_driver ethoc_driver = { | |
1087 | .probe = ethoc_probe, | |
1088 | .remove = ethoc_remove, | |
1089 | .suspend = ethoc_suspend, | |
1090 | .resume = ethoc_resume, | |
1091 | .driver = { | |
1092 | .name = "ethoc", | |
1093 | }, | |
1094 | }; | |
1095 | ||
1096 | static int __init ethoc_init(void) | |
1097 | { | |
1098 | return platform_driver_register(ðoc_driver); | |
1099 | } | |
1100 | ||
1101 | static void __exit ethoc_exit(void) | |
1102 | { | |
1103 | platform_driver_unregister(ðoc_driver); | |
1104 | } | |
1105 | ||
1106 | module_init(ethoc_init); | |
1107 | module_exit(ethoc_exit); | |
1108 | ||
1109 | MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>"); | |
1110 | MODULE_DESCRIPTION("OpenCores Ethernet MAC driver"); | |
1111 | MODULE_LICENSE("GPL v2"); | |
1112 |