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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / net / ethernet / ethoc.c
blob60f0e788cc256c9887361f28c078b3c20ce64a3a
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/dma-mapping.h>
15 #include <linux/etherdevice.h>
16 #include <linux/crc32.h>
17 #include <linux/interrupt.h>
18 #include <linux/io.h>
19 #include <linux/mii.h>
20 #include <linux/phy.h>
21 #include <linux/platform_device.h>
22 #include <linux/sched.h>
23 #include <linux/slab.h>
24 #include <linux/of.h>
25 #include <linux/module.h>
26 #include <net/ethoc.h>
27
28 static int buffer_size = 0x8000; /* 32 KBytes */
29 module_param(buffer_size, int, 0);
30 MODULE_PARM_DESC(buffer_size, "DMA buffer allocation size");
31
32 /* register offsets */
33 #define MODER 0x00
34 #define INT_SOURCE 0x04
35 #define INT_MASK 0x08
36 #define IPGT 0x0c
37 #define IPGR1 0x10
38 #define IPGR2 0x14
39 #define PACKETLEN 0x18
40 #define COLLCONF 0x1c
41 #define TX_BD_NUM 0x20
42 #define CTRLMODER 0x24
43 #define MIIMODER 0x28
44 #define MIICOMMAND 0x2c
45 #define MIIADDRESS 0x30
46 #define MIITX_DATA 0x34
47 #define MIIRX_DATA 0x38
48 #define MIISTATUS 0x3c
49 #define MAC_ADDR0 0x40
50 #define MAC_ADDR1 0x44
51 #define ETH_HASH0 0x48
52 #define ETH_HASH1 0x4c
53 #define ETH_TXCTRL 0x50
54
55 /* mode register */
56 #define MODER_RXEN (1 << 0) /* receive enable */
57 #define MODER_TXEN (1 << 1) /* transmit enable */
58 #define MODER_NOPRE (1 << 2) /* no preamble */
59 #define MODER_BRO (1 << 3) /* broadcast address */
60 #define MODER_IAM (1 << 4) /* individual address mode */
61 #define MODER_PRO (1 << 5) /* promiscuous mode */
62 #define MODER_IFG (1 << 6) /* interframe gap for incoming frames */
63 #define MODER_LOOP (1 << 7) /* loopback */
64 #define MODER_NBO (1 << 8) /* no back-off */
65 #define MODER_EDE (1 << 9) /* excess defer enable */
66 #define MODER_FULLD (1 << 10) /* full duplex */
67 #define MODER_RESET (1 << 11) /* FIXME: reset (undocumented) */
68 #define MODER_DCRC (1 << 12) /* delayed CRC enable */
69 #define MODER_CRC (1 << 13) /* CRC enable */
70 #define MODER_HUGE (1 << 14) /* huge packets enable */
71 #define MODER_PAD (1 << 15) /* padding enabled */
72 #define MODER_RSM (1 << 16) /* receive small packets */
73
74 /* interrupt source and mask registers */
75 #define INT_MASK_TXF (1 << 0) /* transmit frame */
76 #define INT_MASK_TXE (1 << 1) /* transmit error */
77 #define INT_MASK_RXF (1 << 2) /* receive frame */
78 #define INT_MASK_RXE (1 << 3) /* receive error */
79 #define INT_MASK_BUSY (1 << 4)
80 #define INT_MASK_TXC (1 << 5) /* transmit control frame */
81 #define INT_MASK_RXC (1 << 6) /* receive control frame */
82
83 #define INT_MASK_TX (INT_MASK_TXF | INT_MASK_TXE)
84 #define INT_MASK_RX (INT_MASK_RXF | INT_MASK_RXE)
85
86 #define INT_MASK_ALL ( \
87 INT_MASK_TXF | INT_MASK_TXE | \
88 INT_MASK_RXF | INT_MASK_RXE | \
89 INT_MASK_TXC | INT_MASK_RXC | \
90 INT_MASK_BUSY \
91 )
92
93 /* packet length register */
94 #define PACKETLEN_MIN(min) (((min) & 0xffff) << 16)
95 #define PACKETLEN_MAX(max) (((max) & 0xffff) << 0)
96 #define PACKETLEN_MIN_MAX(min, max) (PACKETLEN_MIN(min) | \
97 PACKETLEN_MAX(max))
98
99 /* transmit buffer number register */
100 #define TX_BD_NUM_VAL(x) (((x) <= 0x80) ? (x) : 0x80)
101
102 /* control module mode register */
103 #define CTRLMODER_PASSALL (1 << 0) /* pass all receive frames */
104 #define CTRLMODER_RXFLOW (1 << 1) /* receive control flow */
105 #define CTRLMODER_TXFLOW (1 << 2) /* transmit control flow */
106
107 /* MII mode register */
108 #define MIIMODER_CLKDIV(x) ((x) & 0xfe) /* needs to be an even number */
109 #define MIIMODER_NOPRE (1 << 8) /* no preamble */
110
111 /* MII command register */
112 #define MIICOMMAND_SCAN (1 << 0) /* scan status */
113 #define MIICOMMAND_READ (1 << 1) /* read status */
114 #define MIICOMMAND_WRITE (1 << 2) /* write control data */
115
116 /* MII address register */
117 #define MIIADDRESS_FIAD(x) (((x) & 0x1f) << 0)
118 #define MIIADDRESS_RGAD(x) (((x) & 0x1f) << 8)
119 #define MIIADDRESS_ADDR(phy, reg) (MIIADDRESS_FIAD(phy) | \
120 MIIADDRESS_RGAD(reg))
121
122 /* MII transmit data register */
123 #define MIITX_DATA_VAL(x) ((x) & 0xffff)
124
125 /* MII receive data register */
126 #define MIIRX_DATA_VAL(x) ((x) & 0xffff)
127
128 /* MII status register */
129 #define MIISTATUS_LINKFAIL (1 << 0)
130 #define MIISTATUS_BUSY (1 << 1)
131 #define MIISTATUS_INVALID (1 << 2)
132
133 /* TX buffer descriptor */
134 #define TX_BD_CS (1 << 0) /* carrier sense lost */
135 #define TX_BD_DF (1 << 1) /* defer indication */
136 #define TX_BD_LC (1 << 2) /* late collision */
137 #define TX_BD_RL (1 << 3) /* retransmission limit */
138 #define TX_BD_RETRY_MASK (0x00f0)
139 #define TX_BD_RETRY(x) (((x) & 0x00f0) >> 4)
140 #define TX_BD_UR (1 << 8) /* transmitter underrun */
141 #define TX_BD_CRC (1 << 11) /* TX CRC enable */
142 #define TX_BD_PAD (1 << 12) /* pad enable for short packets */
143 #define TX_BD_WRAP (1 << 13)
144 #define TX_BD_IRQ (1 << 14) /* interrupt request enable */
145 #define TX_BD_READY (1 << 15) /* TX buffer ready */
146 #define TX_BD_LEN(x) (((x) & 0xffff) << 16)
147 #define TX_BD_LEN_MASK (0xffff << 16)
148
149 #define TX_BD_STATS (TX_BD_CS | TX_BD_DF | TX_BD_LC | \
150 TX_BD_RL | TX_BD_RETRY_MASK | TX_BD_UR)
151
152 /* RX buffer descriptor */
153 #define RX_BD_LC (1 << 0) /* late collision */
154 #define RX_BD_CRC (1 << 1) /* RX CRC error */
155 #define RX_BD_SF (1 << 2) /* short frame */
156 #define RX_BD_TL (1 << 3) /* too long */
157 #define RX_BD_DN (1 << 4) /* dribble nibble */
158 #define RX_BD_IS (1 << 5) /* invalid symbol */
159 #define RX_BD_OR (1 << 6) /* receiver overrun */
160 #define RX_BD_MISS (1 << 7)
161 #define RX_BD_CF (1 << 8) /* control frame */
162 #define RX_BD_WRAP (1 << 13)
163 #define RX_BD_IRQ (1 << 14) /* interrupt request enable */
164 #define RX_BD_EMPTY (1 << 15)
165 #define RX_BD_LEN(x) (((x) & 0xffff) << 16)
166
167 #define RX_BD_STATS (RX_BD_LC | RX_BD_CRC | RX_BD_SF | RX_BD_TL | \
168 RX_BD_DN | RX_BD_IS | RX_BD_OR | RX_BD_MISS)
169
170 #define ETHOC_BUFSIZ 1536
171 #define ETHOC_ZLEN 64
172 #define ETHOC_BD_BASE 0x400
173 #define ETHOC_TIMEOUT (HZ / 2)
174 #define ETHOC_MII_TIMEOUT (1 + (HZ / 5))
175
176 /**
177 * struct ethoc - driver-private device structure
178 * @iobase: pointer to I/O memory region
179 * @membase: pointer to buffer memory region
180 * @dma_alloc: dma allocated buffer size
181 * @io_region_size: I/O memory region size
182 * @num_tx: number of send buffers
183 * @cur_tx: last send buffer written
184 * @dty_tx: last buffer actually sent
185 * @num_rx: number of receive buffers
186 * @cur_rx: current receive buffer
187 * @vma: pointer to array of virtual memory addresses for buffers
188 * @netdev: pointer to network device structure
189 * @napi: NAPI structure
190 * @msg_enable: device state flags
191 * @lock: device lock
192 * @phy: attached PHY
193 * @mdio: MDIO bus for PHY access
194 * @phy_id: address of attached PHY
195 */
196 struct ethoc {
197 void __iomem *iobase;
198 void __iomem *membase;
199 int dma_alloc;
200 resource_size_t io_region_size;
201
202 unsigned int num_tx;
203 unsigned int cur_tx;
204 unsigned int dty_tx;
205
206 unsigned int num_rx;
207 unsigned int cur_rx;
208
209 void** vma;
210
211 struct net_device *netdev;
212 struct napi_struct napi;
213 u32 msg_enable;
214
215 spinlock_t lock;
216
217 struct phy_device *phy;
218 struct mii_bus *mdio;
219 s8 phy_id;
220 };
221
222 /**
223 * struct ethoc_bd - buffer descriptor
224 * @stat: buffer statistics
225 * @addr: physical memory address
226 */
227 struct ethoc_bd {
228 u32 stat;
229 u32 addr;
230 };
231
232 static inline u32 ethoc_read(struct ethoc *dev, loff_t offset)
233 {
234 return ioread32(dev->iobase + offset);
235 }
236
237 static inline void ethoc_write(struct ethoc *dev, loff_t offset, u32 data)
238 {
239 iowrite32(data, dev->iobase + offset);
240 }
241
242 static inline void ethoc_read_bd(struct ethoc *dev, int index,
243 struct ethoc_bd *bd)
244 {
245 loff_t offset = ETHOC_BD_BASE + (index * sizeof(struct ethoc_bd));
246 bd->stat = ethoc_read(dev, offset + 0);
247 bd->addr = ethoc_read(dev, offset + 4);
248 }
249
250 static inline void ethoc_write_bd(struct ethoc *dev, int index,
251 const struct ethoc_bd *bd)
252 {
253 loff_t offset = ETHOC_BD_BASE + (index * sizeof(struct ethoc_bd));
254 ethoc_write(dev, offset + 0, bd->stat);
255 ethoc_write(dev, offset + 4, bd->addr);
256 }
257
258 static inline void ethoc_enable_irq(struct ethoc *dev, u32 mask)
259 {
260 u32 imask = ethoc_read(dev, INT_MASK);
261 imask |= mask;
262 ethoc_write(dev, INT_MASK, imask);
263 }
264
265 static inline void ethoc_disable_irq(struct ethoc *dev, u32 mask)
266 {
267 u32 imask = ethoc_read(dev, INT_MASK);
268 imask &= ~mask;
269 ethoc_write(dev, INT_MASK, imask);
270 }
271
272 static inline void ethoc_ack_irq(struct ethoc *dev, u32 mask)
273 {
274 ethoc_write(dev, INT_SOURCE, mask);
275 }
276
277 static inline void ethoc_enable_rx_and_tx(struct ethoc *dev)
278 {
279 u32 mode = ethoc_read(dev, MODER);
280 mode |= MODER_RXEN | MODER_TXEN;
281 ethoc_write(dev, MODER, mode);
282 }
283
284 static inline void ethoc_disable_rx_and_tx(struct ethoc *dev)
285 {
286 u32 mode = ethoc_read(dev, MODER);
287 mode &= ~(MODER_RXEN | MODER_TXEN);
288 ethoc_write(dev, MODER, mode);
289 }
290
291 static int ethoc_init_ring(struct ethoc *dev, unsigned long mem_start)
292 {
293 struct ethoc_bd bd;
294 int i;
295 void* vma;
296
297 dev->cur_tx = 0;
298 dev->dty_tx = 0;
299 dev->cur_rx = 0;
300
301 ethoc_write(dev, TX_BD_NUM, dev->num_tx);
302
303 /* setup transmission buffers */
304 bd.addr = mem_start;
305 bd.stat = TX_BD_IRQ | TX_BD_CRC;
306 vma = dev->membase;
307
308 for (i = 0; i < dev->num_tx; i++) {
309 if (i == dev->num_tx - 1)
310 bd.stat |= TX_BD_WRAP;
311
312 ethoc_write_bd(dev, i, &bd);
313 bd.addr += ETHOC_BUFSIZ;
314
315 dev->vma[i] = vma;
316 vma += ETHOC_BUFSIZ;
317 }
318
319 bd.stat = RX_BD_EMPTY | RX_BD_IRQ;
320
321 for (i = 0; i < dev->num_rx; i++) {
322 if (i == dev->num_rx - 1)
323 bd.stat |= RX_BD_WRAP;
324
325 ethoc_write_bd(dev, dev->num_tx + i, &bd);
326 bd.addr += ETHOC_BUFSIZ;
327
328 dev->vma[dev->num_tx + i] = vma;
329 vma += ETHOC_BUFSIZ;
330 }
331
332 return 0;
333 }
334
335 static int ethoc_reset(struct ethoc *dev)
336 {
337 u32 mode;
338
339 /* TODO: reset controller? */
340
341 ethoc_disable_rx_and_tx(dev);
342
343 /* TODO: setup registers */
344
345 /* enable FCS generation and automatic padding */
346 mode = ethoc_read(dev, MODER);
347 mode |= MODER_CRC | MODER_PAD;
348 ethoc_write(dev, MODER, mode);
349
350 /* set full-duplex mode */
351 mode = ethoc_read(dev, MODER);
352 mode |= MODER_FULLD;
353 ethoc_write(dev, MODER, mode);
354 ethoc_write(dev, IPGT, 0x15);
355
356 ethoc_ack_irq(dev, INT_MASK_ALL);
357 ethoc_enable_irq(dev, INT_MASK_ALL);
358 ethoc_enable_rx_and_tx(dev);
359 return 0;
360 }
361
362 static unsigned int ethoc_update_rx_stats(struct ethoc *dev,
363 struct ethoc_bd *bd)
364 {
365 struct net_device *netdev = dev->netdev;
366 unsigned int ret = 0;
367
368 if (bd->stat & RX_BD_TL) {
369 dev_err(&netdev->dev, "RX: frame too long\n");
370 netdev->stats.rx_length_errors++;
371 ret++;
372 }
373
374 if (bd->stat & RX_BD_SF) {
375 dev_err(&netdev->dev, "RX: frame too short\n");
376 netdev->stats.rx_length_errors++;
377 ret++;
378 }
379
380 if (bd->stat & RX_BD_DN) {
381 dev_err(&netdev->dev, "RX: dribble nibble\n");
382 netdev->stats.rx_frame_errors++;
383 }
384
385 if (bd->stat & RX_BD_CRC) {
386 dev_err(&netdev->dev, "RX: wrong CRC\n");
387 netdev->stats.rx_crc_errors++;
388 ret++;
389 }
390
391 if (bd->stat & RX_BD_OR) {
392 dev_err(&netdev->dev, "RX: overrun\n");
393 netdev->stats.rx_over_errors++;
394 ret++;
395 }
396
397 if (bd->stat & RX_BD_MISS)
398 netdev->stats.rx_missed_errors++;
399
400 if (bd->stat & RX_BD_LC) {
401 dev_err(&netdev->dev, "RX: late collision\n");
402 netdev->stats.collisions++;
403 ret++;
404 }
405
406 return ret;
407 }
408
409 static int ethoc_rx(struct net_device *dev, int limit)
410 {
411 struct ethoc *priv = netdev_priv(dev);
412 int count;
413
414 for (count = 0; count < limit; ++count) {
415 unsigned int entry;
416 struct ethoc_bd bd;
417
418 entry = priv->num_tx + priv->cur_rx;
419 ethoc_read_bd(priv, entry, &bd);
420 if (bd.stat & RX_BD_EMPTY) {
421 ethoc_ack_irq(priv, INT_MASK_RX);
422 /* If packet (interrupt) came in between checking
423 * BD_EMTPY and clearing the interrupt source, then we
424 * risk missing the packet as the RX interrupt won't
425 * trigger right away when we reenable it; hence, check
426 * BD_EMTPY here again to make sure there isn't such a
427 * packet waiting for us...
428 */
429 ethoc_read_bd(priv, entry, &bd);
430 if (bd.stat & RX_BD_EMPTY)
431 break;
432 }
433
434 if (ethoc_update_rx_stats(priv, &bd) == 0) {
435 int size = bd.stat >> 16;
436 struct sk_buff *skb;
437
438 size -= 4; /* strip the CRC */
439 skb = netdev_alloc_skb_ip_align(dev, size);
440
441 if (likely(skb)) {
442 void *src = priv->vma[entry];
443 memcpy_fromio(skb_put(skb, size), src, size);
444 skb->protocol = eth_type_trans(skb, dev);
445 dev->stats.rx_packets++;
446 dev->stats.rx_bytes += size;
447 netif_receive_skb(skb);
448 } else {
449 if (net_ratelimit())
450 dev_warn(&dev->dev, "low on memory - "
451 "packet dropped\n");
452
453 dev->stats.rx_dropped++;
454 break;
455 }
456 }
457
458 /* clear the buffer descriptor so it can be reused */
459 bd.stat &= ~RX_BD_STATS;
460 bd.stat |= RX_BD_EMPTY;
461 ethoc_write_bd(priv, entry, &bd);
462 if (++priv->cur_rx == priv->num_rx)
463 priv->cur_rx = 0;
464 }
465
466 return count;
467 }
468
469 static void ethoc_update_tx_stats(struct ethoc *dev, struct ethoc_bd *bd)
470 {
471 struct net_device *netdev = dev->netdev;
472
473 if (bd->stat & TX_BD_LC) {
474 dev_err(&netdev->dev, "TX: late collision\n");
475 netdev->stats.tx_window_errors++;
476 }
477
478 if (bd->stat & TX_BD_RL) {
479 dev_err(&netdev->dev, "TX: retransmit limit\n");
480 netdev->stats.tx_aborted_errors++;
481 }
482
483 if (bd->stat & TX_BD_UR) {
484 dev_err(&netdev->dev, "TX: underrun\n");
485 netdev->stats.tx_fifo_errors++;
486 }
487
488 if (bd->stat & TX_BD_CS) {
489 dev_err(&netdev->dev, "TX: carrier sense lost\n");
490 netdev->stats.tx_carrier_errors++;
491 }
492
493 if (bd->stat & TX_BD_STATS)
494 netdev->stats.tx_errors++;
495
496 netdev->stats.collisions += (bd->stat >> 4) & 0xf;
497 netdev->stats.tx_bytes += bd->stat >> 16;
498 netdev->stats.tx_packets++;
499 }
500
501 static int ethoc_tx(struct net_device *dev, int limit)
502 {
503 struct ethoc *priv = netdev_priv(dev);
504 int count;
505 struct ethoc_bd bd;
506
507 for (count = 0; count < limit; ++count) {
508 unsigned int entry;
509
510 entry = priv->dty_tx & (priv->num_tx-1);
511
512 ethoc_read_bd(priv, entry, &bd);
513
514 if (bd.stat & TX_BD_READY || (priv->dty_tx == priv->cur_tx)) {
515 ethoc_ack_irq(priv, INT_MASK_TX);
516 /* If interrupt came in between reading in the BD
517 * and clearing the interrupt source, then we risk
518 * missing the event as the TX interrupt won't trigger
519 * right away when we reenable it; hence, check
520 * BD_EMPTY here again to make sure there isn't such an
521 * event pending...
522 */
523 ethoc_read_bd(priv, entry, &bd);
524 if (bd.stat & TX_BD_READY ||
525 (priv->dty_tx == priv->cur_tx))
526 break;
527 }
528
529 ethoc_update_tx_stats(priv, &bd);
530 priv->dty_tx++;
531 }
532
533 if ((priv->cur_tx - priv->dty_tx) <= (priv->num_tx / 2))
534 netif_wake_queue(dev);
535
536 return count;
537 }
538
539 static irqreturn_t ethoc_interrupt(int irq, void *dev_id)
540 {
541 struct net_device *dev = dev_id;
542 struct ethoc *priv = netdev_priv(dev);
543 u32 pending;
544 u32 mask;
545
546 /* Figure out what triggered the interrupt...
547 * The tricky bit here is that the interrupt source bits get
548 * set in INT_SOURCE for an event regardless of whether that
549 * event is masked or not. Thus, in order to figure out what
550 * triggered the interrupt, we need to remove the sources
551 * for all events that are currently masked. This behaviour
552 * is not particularly well documented but reasonable...
553 */
554 mask = ethoc_read(priv, INT_MASK);
555 pending = ethoc_read(priv, INT_SOURCE);
556 pending &= mask;
557
558 if (unlikely(pending == 0)) {
559 return IRQ_NONE;
560 }
561
562 ethoc_ack_irq(priv, pending);
563
564 /* We always handle the dropped packet interrupt */
565 if (pending & INT_MASK_BUSY) {
566 dev_err(&dev->dev, "packet dropped\n");
567 dev->stats.rx_dropped++;
568 }
569
570 /* Handle receive/transmit event by switching to polling */
571 if (pending & (INT_MASK_TX | INT_MASK_RX)) {
572 ethoc_disable_irq(priv, INT_MASK_TX | INT_MASK_RX);
573 napi_schedule(&priv->napi);
574 }
575
576 return IRQ_HANDLED;
577 }
578
579 static int ethoc_get_mac_address(struct net_device *dev, void *addr)
580 {
581 struct ethoc *priv = netdev_priv(dev);
582 u8 *mac = (u8 *)addr;
583 u32 reg;
584
585 reg = ethoc_read(priv, MAC_ADDR0);
586 mac[2] = (reg >> 24) & 0xff;
587 mac[3] = (reg >> 16) & 0xff;
588 mac[4] = (reg >> 8) & 0xff;
589 mac[5] = (reg >> 0) & 0xff;
590
591 reg = ethoc_read(priv, MAC_ADDR1);
592 mac[0] = (reg >> 8) & 0xff;
593 mac[1] = (reg >> 0) & 0xff;
594
595 return 0;
596 }
597
598 static int ethoc_poll(struct napi_struct *napi, int budget)
599 {
600 struct ethoc *priv = container_of(napi, struct ethoc, napi);
601 int rx_work_done = 0;
602 int tx_work_done = 0;
603
604 rx_work_done = ethoc_rx(priv->netdev, budget);
605 tx_work_done = ethoc_tx(priv->netdev, budget);
606
607 if (rx_work_done < budget && tx_work_done < budget) {
608 napi_complete(napi);
609 ethoc_enable_irq(priv, INT_MASK_TX | INT_MASK_RX);
610 }
611
612 return rx_work_done;
613 }
614
615 static int ethoc_mdio_read(struct mii_bus *bus, int phy, int reg)
616 {
617 struct ethoc *priv = bus->priv;
618 int i;
619
620 ethoc_write(priv, MIIADDRESS, MIIADDRESS_ADDR(phy, reg));
621 ethoc_write(priv, MIICOMMAND, MIICOMMAND_READ);
622
623 for (i=0; i < 5; i++) {
624 u32 status = ethoc_read(priv, MIISTATUS);
625 if (!(status & MIISTATUS_BUSY)) {
626 u32 data = ethoc_read(priv, MIIRX_DATA);
627 /* reset MII command register */
628 ethoc_write(priv, MIICOMMAND, 0);
629 return data;
630 }
631 usleep_range(100,200);
632 }
633
634 return -EBUSY;
635 }
636
637 static int ethoc_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
638 {
639 struct ethoc *priv = bus->priv;
640 int i;
641
642 ethoc_write(priv, MIIADDRESS, MIIADDRESS_ADDR(phy, reg));
643 ethoc_write(priv, MIITX_DATA, val);
644 ethoc_write(priv, MIICOMMAND, MIICOMMAND_WRITE);
645
646 for (i=0; i < 5; i++) {
647 u32 stat = ethoc_read(priv, MIISTATUS);
648 if (!(stat & MIISTATUS_BUSY)) {
649 /* reset MII command register */
650 ethoc_write(priv, MIICOMMAND, 0);
651 return 0;
652 }
653 usleep_range(100,200);
654 }
655
656 return -EBUSY;
657 }
658
659 static int ethoc_mdio_reset(struct mii_bus *bus)
660 {
661 return 0;
662 }
663
664 static void ethoc_mdio_poll(struct net_device *dev)
665 {
666 }
667
668 static int __devinit ethoc_mdio_probe(struct net_device *dev)
669 {
670 struct ethoc *priv = netdev_priv(dev);
671 struct phy_device *phy;
672 int err;
673
674 if (priv->phy_id != -1) {
675 phy = priv->mdio->phy_map[priv->phy_id];
676 } else {
677 phy = phy_find_first(priv->mdio);
678 }
679
680 if (!phy) {
681 dev_err(&dev->dev, "no PHY found\n");
682 return -ENXIO;
683 }
684
685 err = phy_connect_direct(dev, phy, ethoc_mdio_poll, 0,
686 PHY_INTERFACE_MODE_GMII);
687 if (err) {
688 dev_err(&dev->dev, "could not attach to PHY\n");
689 return err;
690 }
691
692 priv->phy = phy;
693 return 0;
694 }
695
696 static int ethoc_open(struct net_device *dev)
697 {
698 struct ethoc *priv = netdev_priv(dev);
699 int ret;
700
701 ret = request_irq(dev->irq, ethoc_interrupt, IRQF_SHARED,
702 dev->name, dev);
703 if (ret)
704 return ret;
705
706 ethoc_init_ring(priv, dev->mem_start);
707 ethoc_reset(priv);
708
709 if (netif_queue_stopped(dev)) {
710 dev_dbg(&dev->dev, " resuming queue\n");
711 netif_wake_queue(dev);
712 } else {
713 dev_dbg(&dev->dev, " starting queue\n");
714 netif_start_queue(dev);
715 }
716
717 phy_start(priv->phy);
718 napi_enable(&priv->napi);
719
720 if (netif_msg_ifup(priv)) {
721 dev_info(&dev->dev, "I/O: %08lx Memory: %08lx-%08lx\n",
722 dev->base_addr, dev->mem_start, dev->mem_end);
723 }
724
725 return 0;
726 }
727
728 static int ethoc_stop(struct net_device *dev)
729 {
730 struct ethoc *priv = netdev_priv(dev);
731
732 napi_disable(&priv->napi);
733
734 if (priv->phy)
735 phy_stop(priv->phy);
736
737 ethoc_disable_rx_and_tx(priv);
738 free_irq(dev->irq, dev);
739
740 if (!netif_queue_stopped(dev))
741 netif_stop_queue(dev);
742
743 return 0;
744 }
745
746 static int ethoc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
747 {
748 struct ethoc *priv = netdev_priv(dev);
749 struct mii_ioctl_data *mdio = if_mii(ifr);
750 struct phy_device *phy = NULL;
751
752 if (!netif_running(dev))
753 return -EINVAL;
754
755 if (cmd != SIOCGMIIPHY) {
756 if (mdio->phy_id >= PHY_MAX_ADDR)
757 return -ERANGE;
758
759 phy = priv->mdio->phy_map[mdio->phy_id];
760 if (!phy)
761 return -ENODEV;
762 } else {
763 phy = priv->phy;
764 }
765
766 return phy_mii_ioctl(phy, ifr, cmd);
767 }
768
769 static int ethoc_config(struct net_device *dev, struct ifmap *map)
770 {
771 return -ENOSYS;
772 }
773
774 static int ethoc_set_mac_address(struct net_device *dev, void *addr)
775 {
776 struct ethoc *priv = netdev_priv(dev);
777 u8 *mac = (u8 *)addr;
778
779 ethoc_write(priv, MAC_ADDR0, (mac[2] << 24) | (mac[3] << 16) |
780 (mac[4] << 8) | (mac[5] << 0));
781 ethoc_write(priv, MAC_ADDR1, (mac[0] << 8) | (mac[1] << 0));
782
783 return 0;
784 }
785
786 static void ethoc_set_multicast_list(struct net_device *dev)
787 {
788 struct ethoc *priv = netdev_priv(dev);
789 u32 mode = ethoc_read(priv, MODER);
790 struct netdev_hw_addr *ha;
791 u32 hash[2] = { 0, 0 };
792
793 /* set loopback mode if requested */
794 if (dev->flags & IFF_LOOPBACK)
795 mode |= MODER_LOOP;
796 else
797 mode &= ~MODER_LOOP;
798
799 /* receive broadcast frames if requested */
800 if (dev->flags & IFF_BROADCAST)
801 mode &= ~MODER_BRO;
802 else
803 mode |= MODER_BRO;
804
805 /* enable promiscuous mode if requested */
806 if (dev->flags & IFF_PROMISC)
807 mode |= MODER_PRO;
808 else
809 mode &= ~MODER_PRO;
810
811 ethoc_write(priv, MODER, mode);
812
813 /* receive multicast frames */
814 if (dev->flags & IFF_ALLMULTI) {
815 hash[0] = 0xffffffff;
816 hash[1] = 0xffffffff;
817 } else {
818 netdev_for_each_mc_addr(ha, dev) {
819 u32 crc = ether_crc(ETH_ALEN, ha->addr);
820 int bit = (crc >> 26) & 0x3f;
821 hash[bit >> 5] |= 1 << (bit & 0x1f);
822 }
823 }
824
825 ethoc_write(priv, ETH_HASH0, hash[0]);
826 ethoc_write(priv, ETH_HASH1, hash[1]);
827 }
828
829 static int ethoc_change_mtu(struct net_device *dev, int new_mtu)
830 {
831 return -ENOSYS;
832 }
833
834 static void ethoc_tx_timeout(struct net_device *dev)
835 {
836 struct ethoc *priv = netdev_priv(dev);
837 u32 pending = ethoc_read(priv, INT_SOURCE);
838 if (likely(pending))
839 ethoc_interrupt(dev->irq, dev);
840 }
841
842 static netdev_tx_t ethoc_start_xmit(struct sk_buff *skb, struct net_device *dev)
843 {
844 struct ethoc *priv = netdev_priv(dev);
845 struct ethoc_bd bd;
846 unsigned int entry;
847 void *dest;
848
849 if (unlikely(skb->len > ETHOC_BUFSIZ)) {
850 dev->stats.tx_errors++;
851 goto out;
852 }
853
854 entry = priv->cur_tx % priv->num_tx;
855 spin_lock_irq(&priv->lock);
856 priv->cur_tx++;
857
858 ethoc_read_bd(priv, entry, &bd);
859 if (unlikely(skb->len < ETHOC_ZLEN))
860 bd.stat |= TX_BD_PAD;
861 else
862 bd.stat &= ~TX_BD_PAD;
863
864 dest = priv->vma[entry];
865 memcpy_toio(dest, skb->data, skb->len);
866
867 bd.stat &= ~(TX_BD_STATS | TX_BD_LEN_MASK);
868 bd.stat |= TX_BD_LEN(skb->len);
869 ethoc_write_bd(priv, entry, &bd);
870
871 bd.stat |= TX_BD_READY;
872 ethoc_write_bd(priv, entry, &bd);
873
874 if (priv->cur_tx == (priv->dty_tx + priv->num_tx)) {
875 dev_dbg(&dev->dev, "stopping queue\n");
876 netif_stop_queue(dev);
877 }
878
879 spin_unlock_irq(&priv->lock);
880 skb_tx_timestamp(skb);
881 out:
882 dev_kfree_skb(skb);
883 return NETDEV_TX_OK;
884 }
885
886 static const struct net_device_ops ethoc_netdev_ops = {
887 .ndo_open = ethoc_open,
888 .ndo_stop = ethoc_stop,
889 .ndo_do_ioctl = ethoc_ioctl,
890 .ndo_set_config = ethoc_config,
891 .ndo_set_mac_address = ethoc_set_mac_address,
892 .ndo_set_rx_mode = ethoc_set_multicast_list,
893 .ndo_change_mtu = ethoc_change_mtu,
894 .ndo_tx_timeout = ethoc_tx_timeout,
895 .ndo_start_xmit = ethoc_start_xmit,
896 };
897
898 /**
899 * ethoc_probe() - initialize OpenCores ethernet MAC
900 * pdev: platform device
901 */
902 static int __devinit ethoc_probe(struct platform_device *pdev)
903 {
904 struct net_device *netdev = NULL;
905 struct resource *res = NULL;
906 struct resource *mmio = NULL;
907 struct resource *mem = NULL;
908 struct ethoc *priv = NULL;
909 unsigned int phy;
910 int num_bd;
911 int ret = 0;
912
913 /* allocate networking device */
914 netdev = alloc_etherdev(sizeof(struct ethoc));
915 if (!netdev) {
916 dev_err(&pdev->dev, "cannot allocate network device\n");
917 ret = -ENOMEM;
918 goto out;
919 }
920
921 SET_NETDEV_DEV(netdev, &pdev->dev);
922 platform_set_drvdata(pdev, netdev);
923
924 /* obtain I/O memory space */
925 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
926 if (!res) {
927 dev_err(&pdev->dev, "cannot obtain I/O memory space\n");
928 ret = -ENXIO;
929 goto free;
930 }
931
932 mmio = devm_request_mem_region(&pdev->dev, res->start,
933 resource_size(res), res->name);
934 if (!mmio) {
935 dev_err(&pdev->dev, "cannot request I/O memory space\n");
936 ret = -ENXIO;
937 goto free;
938 }
939
940 netdev->base_addr = mmio->start;
941
942 /* obtain buffer memory space */
943 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
944 if (res) {
945 mem = devm_request_mem_region(&pdev->dev, res->start,
946 resource_size(res), res->name);
947 if (!mem) {
948 dev_err(&pdev->dev, "cannot request memory space\n");
949 ret = -ENXIO;
950 goto free;
951 }
952
953 netdev->mem_start = mem->start;
954 netdev->mem_end = mem->end;
955 }
956
957
958 /* obtain device IRQ number */
959 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
960 if (!res) {
961 dev_err(&pdev->dev, "cannot obtain IRQ\n");
962 ret = -ENXIO;
963 goto free;
964 }
965
966 netdev->irq = res->start;
967
968 /* setup driver-private data */
969 priv = netdev_priv(netdev);
970 priv->netdev = netdev;
971 priv->dma_alloc = 0;
972 priv->io_region_size = resource_size(mmio);
973
974 priv->iobase = devm_ioremap_nocache(&pdev->dev, netdev->base_addr,
975 resource_size(mmio));
976 if (!priv->iobase) {
977 dev_err(&pdev->dev, "cannot remap I/O memory space\n");
978 ret = -ENXIO;
979 goto error;
980 }
981
982 if (netdev->mem_end) {
983 priv->membase = devm_ioremap_nocache(&pdev->dev,
984 netdev->mem_start, resource_size(mem));
985 if (!priv->membase) {
986 dev_err(&pdev->dev, "cannot remap memory space\n");
987 ret = -ENXIO;
988 goto error;
989 }
990 } else {
991 /* Allocate buffer memory */
992 priv->membase = dmam_alloc_coherent(&pdev->dev,
993 buffer_size, (void *)&netdev->mem_start,
994 GFP_KERNEL);
995 if (!priv->membase) {
996 dev_err(&pdev->dev, "cannot allocate %dB buffer\n",
997 buffer_size);
998 ret = -ENOMEM;
999 goto error;
1000 }
1001 netdev->mem_end = netdev->mem_start + buffer_size;
1002 priv->dma_alloc = buffer_size;
1003 }
1004
1005 /* calculate the number of TX/RX buffers, maximum 128 supported */
1006 num_bd = min_t(unsigned int,
1007 128, (netdev->mem_end - netdev->mem_start + 1) / ETHOC_BUFSIZ);
1008 if (num_bd < 4) {
1009 ret = -ENODEV;
1010 goto error;
1011 }
1012 /* num_tx must be a power of two */
1013 priv->num_tx = rounddown_pow_of_two(num_bd >> 1);
1014 priv->num_rx = num_bd - priv->num_tx;
1015
1016 dev_dbg(&pdev->dev, "ethoc: num_tx: %d num_rx: %d\n",
1017 priv->num_tx, priv->num_rx);
1018
1019 priv->vma = devm_kzalloc(&pdev->dev, num_bd*sizeof(void*), GFP_KERNEL);
1020 if (!priv->vma) {
1021 ret = -ENOMEM;
1022 goto error;
1023 }
1024
1025 /* Allow the platform setup code to pass in a MAC address. */
1026 if (pdev->dev.platform_data) {
1027 struct ethoc_platform_data *pdata = pdev->dev.platform_data;
1028 memcpy(netdev->dev_addr, pdata->hwaddr, IFHWADDRLEN);
1029 priv->phy_id = pdata->phy_id;
1030 } else {
1031 priv->phy_id = -1;
1032
1033 #ifdef CONFIG_OF
1034 {
1035 const uint8_t* mac;
1036
1037 mac = of_get_property(pdev->dev.of_node,
1038 "local-mac-address",
1039 NULL);
1040 if (mac)
1041 memcpy(netdev->dev_addr, mac, IFHWADDRLEN);
1042 }
1043 #endif
1044 }
1045
1046 /* Check that the given MAC address is valid. If it isn't, read the
1047 * current MAC from the controller. */
1048 if (!is_valid_ether_addr(netdev->dev_addr))
1049 ethoc_get_mac_address(netdev, netdev->dev_addr);
1050
1051 /* Check the MAC again for validity, if it still isn't choose and
1052 * program a random one. */
1053 if (!is_valid_ether_addr(netdev->dev_addr))
1054 random_ether_addr(netdev->dev_addr);
1055
1056 ethoc_set_mac_address(netdev, netdev->dev_addr);
1057
1058 /* register MII bus */
1059 priv->mdio = mdiobus_alloc();
1060 if (!priv->mdio) {
1061 ret = -ENOMEM;
1062 goto free;
1063 }
1064
1065 priv->mdio->name = "ethoc-mdio";
1066 snprintf(priv->mdio->id, MII_BUS_ID_SIZE, "%s-%d",
1067 priv->mdio->name, pdev->id);
1068 priv->mdio->read = ethoc_mdio_read;
1069 priv->mdio->write = ethoc_mdio_write;
1070 priv->mdio->reset = ethoc_mdio_reset;
1071 priv->mdio->priv = priv;
1072
1073 priv->mdio->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
1074 if (!priv->mdio->irq) {
1075 ret = -ENOMEM;
1076 goto free_mdio;
1077 }
1078
1079 for (phy = 0; phy < PHY_MAX_ADDR; phy++)
1080 priv->mdio->irq[phy] = PHY_POLL;
1081
1082 ret = mdiobus_register(priv->mdio);
1083 if (ret) {
1084 dev_err(&netdev->dev, "failed to register MDIO bus\n");
1085 goto free_mdio;
1086 }
1087
1088 ret = ethoc_mdio_probe(netdev);
1089 if (ret) {
1090 dev_err(&netdev->dev, "failed to probe MDIO bus\n");
1091 goto error;
1092 }
1093
1094 ether_setup(netdev);
1095
1096 /* setup the net_device structure */
1097 netdev->netdev_ops = &ethoc_netdev_ops;
1098 netdev->watchdog_timeo = ETHOC_TIMEOUT;
1099 netdev->features |= 0;
1100
1101 /* setup NAPI */
1102 netif_napi_add(netdev, &priv->napi, ethoc_poll, 64);
1103
1104 spin_lock_init(&priv->lock);
1105
1106 ret = register_netdev(netdev);
1107 if (ret < 0) {
1108 dev_err(&netdev->dev, "failed to register interface\n");
1109 goto error2;
1110 }
1111
1112 goto out;
1113
1114 error2:
1115 netif_napi_del(&priv->napi);
1116 error:
1117 mdiobus_unregister(priv->mdio);
1118 free_mdio:
1119 kfree(priv->mdio->irq);
1120 mdiobus_free(priv->mdio);
1121 free:
1122 free_netdev(netdev);
1123 out:
1124 return ret;
1125 }
1126
1127 /**
1128 * ethoc_remove() - shutdown OpenCores ethernet MAC
1129 * @pdev: platform device
1130 */
1131 static int __devexit ethoc_remove(struct platform_device *pdev)
1132 {
1133 struct net_device *netdev = platform_get_drvdata(pdev);
1134 struct ethoc *priv = netdev_priv(netdev);
1135
1136 platform_set_drvdata(pdev, NULL);
1137
1138 if (netdev) {
1139 netif_napi_del(&priv->napi);
1140 phy_disconnect(priv->phy);
1141 priv->phy = NULL;
1142
1143 if (priv->mdio) {
1144 mdiobus_unregister(priv->mdio);
1145 kfree(priv->mdio->irq);
1146 mdiobus_free(priv->mdio);
1147 }
1148 unregister_netdev(netdev);
1149 free_netdev(netdev);
1150 }
1151
1152 return 0;
1153 }
1154
1155 #ifdef CONFIG_PM
1156 static int ethoc_suspend(struct platform_device *pdev, pm_message_t state)
1157 {
1158 return -ENOSYS;
1159 }
1160
1161 static int ethoc_resume(struct platform_device *pdev)
1162 {
1163 return -ENOSYS;
1164 }
1165 #else
1166 # define ethoc_suspend NULL
1167 # define ethoc_resume NULL
1168 #endif
1169
1170 static struct of_device_id ethoc_match[] = {
1171 { .compatible = "opencores,ethoc", },
1172 {},
1173 };
1174 MODULE_DEVICE_TABLE(of, ethoc_match);
1175
1176 static struct platform_driver ethoc_driver = {
1177 .probe = ethoc_probe,
1178 .remove = __devexit_p(ethoc_remove),
1179 .suspend = ethoc_suspend,
1180 .resume = ethoc_resume,
1181 .driver = {
1182 .name = "ethoc",
1183 .owner = THIS_MODULE,
1184 .of_match_table = ethoc_match,
1185 },
1186 };
1187
1188 module_platform_driver(ethoc_driver);
1189
1190 MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
1191 MODULE_DESCRIPTION("OpenCores Ethernet MAC driver");
1192 MODULE_LICENSE("GPL v2");
1193