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Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
[linux-2.6/mini2440.git] / drivers / net / ethoc.c
blob91a9b1a3376407a91c26998a59ede7ea55154fdf
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), &ethoc_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++;
814 return -EMSGSIZE;
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;
843 dev_kfree_skb(skb);
844
845 spin_unlock_irq(&priv->lock);
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 = &ethoc_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(&ethoc_driver);
1099 }
1100
1101 static void __exit ethoc_exit(void)
1102 {
1103 platform_driver_unregister(&ethoc_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
Support for the Chinese Samsung S3C2440 based development boards