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Blackfin: sanitize manual control of IPEND[4]
[linux-2.6/linux-2.6-openrd.git] / drivers / net / ethoc.c
blobb7311bc00258569e210949fcf2c17ceaaa62b46b
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 priv->stats.rx_packets++;
408 priv->stats.rx_bytes += size;
409 netif_receive_skb(skb);
410 } else {
411 if (net_ratelimit())
412 dev_warn(&dev->dev, "low on memory - "
413 "packet dropped\n");
414
415 priv->stats.rx_dropped++;
416 break;
417 }
418 }
419
420 /* clear the buffer descriptor so it can be reused */
421 bd.stat &= ~RX_BD_STATS;
422 bd.stat |= RX_BD_EMPTY;
423 ethoc_write_bd(priv, entry, &bd);
424 priv->cur_rx++;
425 }
426
427 return count;
428 }
429
430 static int ethoc_update_tx_stats(struct ethoc *dev, struct ethoc_bd *bd)
431 {
432 struct net_device *netdev = dev->netdev;
433
434 if (bd->stat & TX_BD_LC) {
435 dev_err(&netdev->dev, "TX: late collision\n");
436 dev->stats.tx_window_errors++;
437 }
438
439 if (bd->stat & TX_BD_RL) {
440 dev_err(&netdev->dev, "TX: retransmit limit\n");
441 dev->stats.tx_aborted_errors++;
442 }
443
444 if (bd->stat & TX_BD_UR) {
445 dev_err(&netdev->dev, "TX: underrun\n");
446 dev->stats.tx_fifo_errors++;
447 }
448
449 if (bd->stat & TX_BD_CS) {
450 dev_err(&netdev->dev, "TX: carrier sense lost\n");
451 dev->stats.tx_carrier_errors++;
452 }
453
454 if (bd->stat & TX_BD_STATS)
455 dev->stats.tx_errors++;
456
457 dev->stats.collisions += (bd->stat >> 4) & 0xf;
458 dev->stats.tx_bytes += bd->stat >> 16;
459 dev->stats.tx_packets++;
460 return 0;
461 }
462
463 static void ethoc_tx(struct net_device *dev)
464 {
465 struct ethoc *priv = netdev_priv(dev);
466
467 spin_lock(&priv->lock);
468
469 while (priv->dty_tx != priv->cur_tx) {
470 unsigned int entry = priv->dty_tx % priv->num_tx;
471 struct ethoc_bd bd;
472
473 ethoc_read_bd(priv, entry, &bd);
474 if (bd.stat & TX_BD_READY)
475 break;
476
477 entry = (++priv->dty_tx) % priv->num_tx;
478 (void)ethoc_update_tx_stats(priv, &bd);
479 }
480
481 if ((priv->cur_tx - priv->dty_tx) <= (priv->num_tx / 2))
482 netif_wake_queue(dev);
483
484 ethoc_ack_irq(priv, INT_MASK_TX);
485 spin_unlock(&priv->lock);
486 }
487
488 static irqreturn_t ethoc_interrupt(int irq, void *dev_id)
489 {
490 struct net_device *dev = (struct net_device *)dev_id;
491 struct ethoc *priv = netdev_priv(dev);
492 u32 pending;
493
494 ethoc_disable_irq(priv, INT_MASK_ALL);
495 pending = ethoc_read(priv, INT_SOURCE);
496 if (unlikely(pending == 0)) {
497 ethoc_enable_irq(priv, INT_MASK_ALL);
498 return IRQ_NONE;
499 }
500
501 ethoc_ack_irq(priv, INT_MASK_ALL);
502
503 if (pending & INT_MASK_BUSY) {
504 dev_err(&dev->dev, "packet dropped\n");
505 priv->stats.rx_dropped++;
506 }
507
508 if (pending & INT_MASK_RX) {
509 if (napi_schedule_prep(&priv->napi))
510 __napi_schedule(&priv->napi);
511 } else {
512 ethoc_enable_irq(priv, INT_MASK_RX);
513 }
514
515 if (pending & INT_MASK_TX)
516 ethoc_tx(dev);
517
518 ethoc_enable_irq(priv, INT_MASK_ALL & ~INT_MASK_RX);
519 return IRQ_HANDLED;
520 }
521
522 static int ethoc_get_mac_address(struct net_device *dev, void *addr)
523 {
524 struct ethoc *priv = netdev_priv(dev);
525 u8 *mac = (u8 *)addr;
526 u32 reg;
527
528 reg = ethoc_read(priv, MAC_ADDR0);
529 mac[2] = (reg >> 24) & 0xff;
530 mac[3] = (reg >> 16) & 0xff;
531 mac[4] = (reg >> 8) & 0xff;
532 mac[5] = (reg >> 0) & 0xff;
533
534 reg = ethoc_read(priv, MAC_ADDR1);
535 mac[0] = (reg >> 8) & 0xff;
536 mac[1] = (reg >> 0) & 0xff;
537
538 return 0;
539 }
540
541 static int ethoc_poll(struct napi_struct *napi, int budget)
542 {
543 struct ethoc *priv = container_of(napi, struct ethoc, napi);
544 int work_done = 0;
545
546 work_done = ethoc_rx(priv->netdev, budget);
547 if (work_done < budget) {
548 ethoc_enable_irq(priv, INT_MASK_RX);
549 napi_complete(napi);
550 }
551
552 return work_done;
553 }
554
555 static int ethoc_mdio_read(struct mii_bus *bus, int phy, int reg)
556 {
557 unsigned long timeout = jiffies + ETHOC_MII_TIMEOUT;
558 struct ethoc *priv = bus->priv;
559
560 ethoc_write(priv, MIIADDRESS, MIIADDRESS_ADDR(phy, reg));
561 ethoc_write(priv, MIICOMMAND, MIICOMMAND_READ);
562
563 while (time_before(jiffies, timeout)) {
564 u32 status = ethoc_read(priv, MIISTATUS);
565 if (!(status & MIISTATUS_BUSY)) {
566 u32 data = ethoc_read(priv, MIIRX_DATA);
567 /* reset MII command register */
568 ethoc_write(priv, MIICOMMAND, 0);
569 return data;
570 }
571
572 schedule();
573 }
574
575 return -EBUSY;
576 }
577
578 static int ethoc_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
579 {
580 unsigned long timeout = jiffies + ETHOC_MII_TIMEOUT;
581 struct ethoc *priv = bus->priv;
582
583 ethoc_write(priv, MIIADDRESS, MIIADDRESS_ADDR(phy, reg));
584 ethoc_write(priv, MIITX_DATA, val);
585 ethoc_write(priv, MIICOMMAND, MIICOMMAND_WRITE);
586
587 while (time_before(jiffies, timeout)) {
588 u32 stat = ethoc_read(priv, MIISTATUS);
589 if (!(stat & MIISTATUS_BUSY))
590 return 0;
591
592 schedule();
593 }
594
595 return -EBUSY;
596 }
597
598 static int ethoc_mdio_reset(struct mii_bus *bus)
599 {
600 return 0;
601 }
602
603 static void ethoc_mdio_poll(struct net_device *dev)
604 {
605 }
606
607 static int ethoc_mdio_probe(struct net_device *dev)
608 {
609 struct ethoc *priv = netdev_priv(dev);
610 struct phy_device *phy;
611 int i;
612
613 for (i = 0; i < PHY_MAX_ADDR; i++) {
614 phy = priv->mdio->phy_map[i];
615 if (phy) {
616 if (priv->phy_id != -1) {
617 /* attach to specified PHY */
618 if (priv->phy_id == phy->addr)
619 break;
620 } else {
621 /* autoselect PHY if none was specified */
622 if (phy->addr != 0)
623 break;
624 }
625 }
626 }
627
628 if (!phy) {
629 dev_err(&dev->dev, "no PHY found\n");
630 return -ENXIO;
631 }
632
633 phy = phy_connect(dev, dev_name(&phy->dev), &ethoc_mdio_poll, 0,
634 PHY_INTERFACE_MODE_GMII);
635 if (IS_ERR(phy)) {
636 dev_err(&dev->dev, "could not attach to PHY\n");
637 return PTR_ERR(phy);
638 }
639
640 priv->phy = phy;
641 return 0;
642 }
643
644 static int ethoc_open(struct net_device *dev)
645 {
646 struct ethoc *priv = netdev_priv(dev);
647 unsigned int min_tx = 2;
648 unsigned int num_bd;
649 int ret;
650
651 ret = request_irq(dev->irq, ethoc_interrupt, IRQF_SHARED,
652 dev->name, dev);
653 if (ret)
654 return ret;
655
656 /* calculate the number of TX/RX buffers */
657 num_bd = (dev->mem_end - dev->mem_start + 1) / ETHOC_BUFSIZ;
658 priv->num_tx = min(min_tx, num_bd / 4);
659 priv->num_rx = num_bd - priv->num_tx;
660 ethoc_write(priv, TX_BD_NUM, priv->num_tx);
661
662 ethoc_init_ring(priv);
663 ethoc_reset(priv);
664
665 if (netif_queue_stopped(dev)) {
666 dev_dbg(&dev->dev, " resuming queue\n");
667 netif_wake_queue(dev);
668 } else {
669 dev_dbg(&dev->dev, " starting queue\n");
670 netif_start_queue(dev);
671 }
672
673 phy_start(priv->phy);
674 napi_enable(&priv->napi);
675
676 if (netif_msg_ifup(priv)) {
677 dev_info(&dev->dev, "I/O: %08lx Memory: %08lx-%08lx\n",
678 dev->base_addr, dev->mem_start, dev->mem_end);
679 }
680
681 return 0;
682 }
683
684 static int ethoc_stop(struct net_device *dev)
685 {
686 struct ethoc *priv = netdev_priv(dev);
687
688 napi_disable(&priv->napi);
689
690 if (priv->phy)
691 phy_stop(priv->phy);
692
693 ethoc_disable_rx_and_tx(priv);
694 free_irq(dev->irq, dev);
695
696 if (!netif_queue_stopped(dev))
697 netif_stop_queue(dev);
698
699 return 0;
700 }
701
702 static int ethoc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
703 {
704 struct ethoc *priv = netdev_priv(dev);
705 struct mii_ioctl_data *mdio = if_mii(ifr);
706 struct phy_device *phy = NULL;
707
708 if (!netif_running(dev))
709 return -EINVAL;
710
711 if (cmd != SIOCGMIIPHY) {
712 if (mdio->phy_id >= PHY_MAX_ADDR)
713 return -ERANGE;
714
715 phy = priv->mdio->phy_map[mdio->phy_id];
716 if (!phy)
717 return -ENODEV;
718 } else {
719 phy = priv->phy;
720 }
721
722 return phy_mii_ioctl(phy, mdio, cmd);
723 }
724
725 static int ethoc_config(struct net_device *dev, struct ifmap *map)
726 {
727 return -ENOSYS;
728 }
729
730 static int ethoc_set_mac_address(struct net_device *dev, void *addr)
731 {
732 struct ethoc *priv = netdev_priv(dev);
733 u8 *mac = (u8 *)addr;
734
735 ethoc_write(priv, MAC_ADDR0, (mac[2] << 24) | (mac[3] << 16) |
736 (mac[4] << 8) | (mac[5] << 0));
737 ethoc_write(priv, MAC_ADDR1, (mac[0] << 8) | (mac[1] << 0));
738
739 return 0;
740 }
741
742 static void ethoc_set_multicast_list(struct net_device *dev)
743 {
744 struct ethoc *priv = netdev_priv(dev);
745 u32 mode = ethoc_read(priv, MODER);
746 struct dev_mc_list *mc = NULL;
747 u32 hash[2] = { 0, 0 };
748
749 /* set loopback mode if requested */
750 if (dev->flags & IFF_LOOPBACK)
751 mode |= MODER_LOOP;
752 else
753 mode &= ~MODER_LOOP;
754
755 /* receive broadcast frames if requested */
756 if (dev->flags & IFF_BROADCAST)
757 mode &= ~MODER_BRO;
758 else
759 mode |= MODER_BRO;
760
761 /* enable promiscuous mode if requested */
762 if (dev->flags & IFF_PROMISC)
763 mode |= MODER_PRO;
764 else
765 mode &= ~MODER_PRO;
766
767 ethoc_write(priv, MODER, mode);
768
769 /* receive multicast frames */
770 if (dev->flags & IFF_ALLMULTI) {
771 hash[0] = 0xffffffff;
772 hash[1] = 0xffffffff;
773 } else {
774 for (mc = dev->mc_list; mc; mc = mc->next) {
775 u32 crc = ether_crc(mc->dmi_addrlen, mc->dmi_addr);
776 int bit = (crc >> 26) & 0x3f;
777 hash[bit >> 5] |= 1 << (bit & 0x1f);
778 }
779 }
780
781 ethoc_write(priv, ETH_HASH0, hash[0]);
782 ethoc_write(priv, ETH_HASH1, hash[1]);
783 }
784
785 static int ethoc_change_mtu(struct net_device *dev, int new_mtu)
786 {
787 return -ENOSYS;
788 }
789
790 static void ethoc_tx_timeout(struct net_device *dev)
791 {
792 struct ethoc *priv = netdev_priv(dev);
793 u32 pending = ethoc_read(priv, INT_SOURCE);
794 if (likely(pending))
795 ethoc_interrupt(dev->irq, dev);
796 }
797
798 static struct net_device_stats *ethoc_stats(struct net_device *dev)
799 {
800 struct ethoc *priv = netdev_priv(dev);
801 return &priv->stats;
802 }
803
804 static netdev_tx_t ethoc_start_xmit(struct sk_buff *skb, struct net_device *dev)
805 {
806 struct ethoc *priv = netdev_priv(dev);
807 struct ethoc_bd bd;
808 unsigned int entry;
809 void *dest;
810
811 if (unlikely(skb->len > ETHOC_BUFSIZ)) {
812 priv->stats.tx_errors++;
813 goto out;
814 }
815
816 entry = priv->cur_tx % priv->num_tx;
817 spin_lock_irq(&priv->lock);
818 priv->cur_tx++;
819
820 ethoc_read_bd(priv, entry, &bd);
821 if (unlikely(skb->len < ETHOC_ZLEN))
822 bd.stat |= TX_BD_PAD;
823 else
824 bd.stat &= ~TX_BD_PAD;
825
826 dest = priv->membase + bd.addr;
827 memcpy_toio(dest, skb->data, skb->len);
828
829 bd.stat &= ~(TX_BD_STATS | TX_BD_LEN_MASK);
830 bd.stat |= TX_BD_LEN(skb->len);
831 ethoc_write_bd(priv, entry, &bd);
832
833 bd.stat |= TX_BD_READY;
834 ethoc_write_bd(priv, entry, &bd);
835
836 if (priv->cur_tx == (priv->dty_tx + priv->num_tx)) {
837 dev_dbg(&dev->dev, "stopping queue\n");
838 netif_stop_queue(dev);
839 }
840
841 dev->trans_start = jiffies;
842 spin_unlock_irq(&priv->lock);
843 out:
844 dev_kfree_skb(skb);
845 return NETDEV_TX_OK;
846 }
847
848 static const struct net_device_ops ethoc_netdev_ops = {
849 .ndo_open = ethoc_open,
850 .ndo_stop = ethoc_stop,
851 .ndo_do_ioctl = ethoc_ioctl,
852 .ndo_set_config = ethoc_config,
853 .ndo_set_mac_address = ethoc_set_mac_address,
854 .ndo_set_multicast_list = ethoc_set_multicast_list,
855 .ndo_change_mtu = ethoc_change_mtu,
856 .ndo_tx_timeout = ethoc_tx_timeout,
857 .ndo_get_stats = ethoc_stats,
858 .ndo_start_xmit = ethoc_start_xmit,
859 };
860
861 /**
862 * ethoc_probe() - initialize OpenCores ethernet MAC
863 * pdev: platform device
864 */
865 static int ethoc_probe(struct platform_device *pdev)
866 {
867 struct net_device *netdev = NULL;
868 struct resource *res = NULL;
869 struct resource *mmio = NULL;
870 struct resource *mem = NULL;
871 struct ethoc *priv = NULL;
872 unsigned int phy;
873 int ret = 0;
874
875 /* allocate networking device */
876 netdev = alloc_etherdev(sizeof(struct ethoc));
877 if (!netdev) {
878 dev_err(&pdev->dev, "cannot allocate network device\n");
879 ret = -ENOMEM;
880 goto out;
881 }
882
883 SET_NETDEV_DEV(netdev, &pdev->dev);
884 platform_set_drvdata(pdev, netdev);
885
886 /* obtain I/O memory space */
887 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
888 if (!res) {
889 dev_err(&pdev->dev, "cannot obtain I/O memory space\n");
890 ret = -ENXIO;
891 goto free;
892 }
893
894 mmio = devm_request_mem_region(&pdev->dev, res->start,
895 res->end - res->start + 1, res->name);
896 if (!mmio) {
897 dev_err(&pdev->dev, "cannot request I/O memory space\n");
898 ret = -ENXIO;
899 goto free;
900 }
901
902 netdev->base_addr = mmio->start;
903
904 /* obtain buffer memory space */
905 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
906 if (!res) {
907 dev_err(&pdev->dev, "cannot obtain memory space\n");
908 ret = -ENXIO;
909 goto free;
910 }
911
912 mem = devm_request_mem_region(&pdev->dev, res->start,
913 res->end - res->start + 1, res->name);
914 if (!mem) {
915 dev_err(&pdev->dev, "cannot request memory space\n");
916 ret = -ENXIO;
917 goto free;
918 }
919
920 netdev->mem_start = mem->start;
921 netdev->mem_end = mem->end;
922
923 /* obtain device IRQ number */
924 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
925 if (!res) {
926 dev_err(&pdev->dev, "cannot obtain IRQ\n");
927 ret = -ENXIO;
928 goto free;
929 }
930
931 netdev->irq = res->start;
932
933 /* setup driver-private data */
934 priv = netdev_priv(netdev);
935 priv->netdev = netdev;
936
937 priv->iobase = devm_ioremap_nocache(&pdev->dev, netdev->base_addr,
938 mmio->end - mmio->start + 1);
939 if (!priv->iobase) {
940 dev_err(&pdev->dev, "cannot remap I/O memory space\n");
941 ret = -ENXIO;
942 goto error;
943 }
944
945 priv->membase = devm_ioremap_nocache(&pdev->dev, netdev->mem_start,
946 mem->end - mem->start + 1);
947 if (!priv->membase) {
948 dev_err(&pdev->dev, "cannot remap memory space\n");
949 ret = -ENXIO;
950 goto error;
951 }
952
953 /* Allow the platform setup code to pass in a MAC address. */
954 if (pdev->dev.platform_data) {
955 struct ethoc_platform_data *pdata =
956 (struct ethoc_platform_data *)pdev->dev.platform_data;
957 memcpy(netdev->dev_addr, pdata->hwaddr, IFHWADDRLEN);
958 priv->phy_id = pdata->phy_id;
959 }
960
961 /* Check that the given MAC address is valid. If it isn't, read the
962 * current MAC from the controller. */
963 if (!is_valid_ether_addr(netdev->dev_addr))
964 ethoc_get_mac_address(netdev, netdev->dev_addr);
965
966 /* Check the MAC again for validity, if it still isn't choose and
967 * program a random one. */
968 if (!is_valid_ether_addr(netdev->dev_addr))
969 random_ether_addr(netdev->dev_addr);
970
971 ethoc_set_mac_address(netdev, netdev->dev_addr);
972
973 /* register MII bus */
974 priv->mdio = mdiobus_alloc();
975 if (!priv->mdio) {
976 ret = -ENOMEM;
977 goto free;
978 }
979
980 priv->mdio->name = "ethoc-mdio";
981 snprintf(priv->mdio->id, MII_BUS_ID_SIZE, "%s-%d",
982 priv->mdio->name, pdev->id);
983 priv->mdio->read = ethoc_mdio_read;
984 priv->mdio->write = ethoc_mdio_write;
985 priv->mdio->reset = ethoc_mdio_reset;
986 priv->mdio->priv = priv;
987
988 priv->mdio->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
989 if (!priv->mdio->irq) {
990 ret = -ENOMEM;
991 goto free_mdio;
992 }
993
994 for (phy = 0; phy < PHY_MAX_ADDR; phy++)
995 priv->mdio->irq[phy] = PHY_POLL;
996
997 ret = mdiobus_register(priv->mdio);
998 if (ret) {
999 dev_err(&netdev->dev, "failed to register MDIO bus\n");
1000 goto free_mdio;
1001 }
1002
1003 ret = ethoc_mdio_probe(netdev);
1004 if (ret) {
1005 dev_err(&netdev->dev, "failed to probe MDIO bus\n");
1006 goto error;
1007 }
1008
1009 ether_setup(netdev);
1010
1011 /* setup the net_device structure */
1012 netdev->netdev_ops = &ethoc_netdev_ops;
1013 netdev->watchdog_timeo = ETHOC_TIMEOUT;
1014 netdev->features |= 0;
1015
1016 /* setup NAPI */
1017 memset(&priv->napi, 0, sizeof(priv->napi));
1018 netif_napi_add(netdev, &priv->napi, ethoc_poll, 64);
1019
1020 spin_lock_init(&priv->rx_lock);
1021 spin_lock_init(&priv->lock);
1022
1023 ret = register_netdev(netdev);
1024 if (ret < 0) {
1025 dev_err(&netdev->dev, "failed to register interface\n");
1026 goto error;
1027 }
1028
1029 goto out;
1030
1031 error:
1032 mdiobus_unregister(priv->mdio);
1033 free_mdio:
1034 kfree(priv->mdio->irq);
1035 mdiobus_free(priv->mdio);
1036 free:
1037 free_netdev(netdev);
1038 out:
1039 return ret;
1040 }
1041
1042 /**
1043 * ethoc_remove() - shutdown OpenCores ethernet MAC
1044 * @pdev: platform device
1045 */
1046 static int ethoc_remove(struct platform_device *pdev)
1047 {
1048 struct net_device *netdev = platform_get_drvdata(pdev);
1049 struct ethoc *priv = netdev_priv(netdev);
1050
1051 platform_set_drvdata(pdev, NULL);
1052
1053 if (netdev) {
1054 phy_disconnect(priv->phy);
1055 priv->phy = NULL;
1056
1057 if (priv->mdio) {
1058 mdiobus_unregister(priv->mdio);
1059 kfree(priv->mdio->irq);
1060 mdiobus_free(priv->mdio);
1061 }
1062
1063 unregister_netdev(netdev);
1064 free_netdev(netdev);
1065 }
1066
1067 return 0;
1068 }
1069
1070 #ifdef CONFIG_PM
1071 static int ethoc_suspend(struct platform_device *pdev, pm_message_t state)
1072 {
1073 return -ENOSYS;
1074 }
1075
1076 static int ethoc_resume(struct platform_device *pdev)
1077 {
1078 return -ENOSYS;
1079 }
1080 #else
1081 # define ethoc_suspend NULL
1082 # define ethoc_resume NULL
1083 #endif
1084
1085 static struct platform_driver ethoc_driver = {
1086 .probe = ethoc_probe,
1087 .remove = ethoc_remove,
1088 .suspend = ethoc_suspend,
1089 .resume = ethoc_resume,
1090 .driver = {
1091 .name = "ethoc",
1092 },
1093 };
1094
1095 static int __init ethoc_init(void)
1096 {
1097 return platform_driver_register(&ethoc_driver);
1098 }
1099
1100 static void __exit ethoc_exit(void)
1101 {
1102 platform_driver_unregister(&ethoc_driver);
1103 }
1104
1105 module_init(ethoc_init);
1106 module_exit(ethoc_exit);
1107
1108 MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
1109 MODULE_DESCRIPTION("OpenCores Ethernet MAC driver");
1110 MODULE_LICENSE("GPL v2");
1111
linux 2.6 git repository for openrd