1 /*
2 * Cadence MACB/GEM Ethernet Controller driver
3 *
4 * Copyright (C) 2004-2006 Atmel Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12 #include <linux/clk.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/netdevice.h>
21 #include <linux/etherdevice.h>
22 #include <linux/dma-mapping.h>
23 #include <linux/platform_data/macb.h>
24 #include <linux/platform_device.h>
25 #include <linux/phy.h>
26 #include <linux/of.h>
27 #include <linux/of_device.h>
28 #include <linux/of_net.h>
29
30 #include "macb.h"
31
32 #define RX_BUFFER_SIZE 128
33 #define RX_RING_SIZE 512
34 #define RX_RING_BYTES (sizeof(struct dma_desc) * RX_RING_SIZE)
35
36 /* Make the IP header word-aligned (the ethernet header is 14 bytes) */
37 #define RX_OFFSET 2
38
39 #define TX_RING_SIZE 128
40 #define DEF_TX_RING_PENDING (TX_RING_SIZE - 1)
41 #define TX_RING_BYTES (sizeof(struct dma_desc) * TX_RING_SIZE)
42
43 #define TX_RING_GAP(bp) \
44 (TX_RING_SIZE - (bp)->tx_pending)
45 #define TX_BUFFS_AVAIL(bp) \
46 (((bp)->tx_tail <= (bp)->tx_head) ? \
47 (bp)->tx_tail + (bp)->tx_pending - (bp)->tx_head : \
48 (bp)->tx_tail - (bp)->tx_head - TX_RING_GAP(bp))
49 #define NEXT_TX(n) (((n) + 1) & (TX_RING_SIZE - 1))
50
51 #define NEXT_RX(n) (((n) + 1) & (RX_RING_SIZE - 1))
52
53 /* minimum number of free TX descriptors before waking up TX process */
54 #define MACB_TX_WAKEUP_THRESH (TX_RING_SIZE / 4)
55
56 #define MACB_RX_INT_FLAGS (MACB_BIT(RCOMP) | MACB_BIT(RXUBR) \
57 | MACB_BIT(ISR_ROVR))
58
__macb_set_hwaddr(struct macb * bp)59 static void __macb_set_hwaddr(struct macb *bp)
60 {
61 u32 bottom;
62 u16 top;
63
64 bottom = cpu_to_le32(*((u32 *)bp->dev->dev_addr));
65 macb_or_gem_writel(bp, SA1B, bottom);
66 top = cpu_to_le16(*((u16 *)(bp->dev->dev_addr + 4)));
67 macb_or_gem_writel(bp, SA1T, top);
68 }
69
macb_get_hwaddr(struct macb * bp)70 static void __init macb_get_hwaddr(struct macb *bp)
71 {
72 u32 bottom;
73 u16 top;
74 u8 addr[6];
75
76 bottom = macb_or_gem_readl(bp, SA1B);
77 top = macb_or_gem_readl(bp, SA1T);
78
79 addr[0] = bottom & 0xff;
80 addr[1] = (bottom >> 8) & 0xff;
81 addr[2] = (bottom >> 16) & 0xff;
82 addr[3] = (bottom >> 24) & 0xff;
83 addr[4] = top & 0xff;
84 addr[5] = (top >> 8) & 0xff;
85
86 if (is_valid_ether_addr(addr)) {
87 memcpy(bp->dev->dev_addr, addr, sizeof(addr));
88 } else {
89 netdev_info(bp->dev, "invalid hw address, using random\n");
90 random_ether_addr(bp->dev->dev_addr);
91 }
92 }
93
macb_mdio_read(struct mii_bus * bus,int mii_id,int regnum)94 static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
95 {
96 struct macb *bp = bus->priv;
97 int value;
98
99 macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
100 | MACB_BF(RW, MACB_MAN_READ)
101 | MACB_BF(PHYA, mii_id)
102 | MACB_BF(REGA, regnum)
103 | MACB_BF(CODE, MACB_MAN_CODE)));
104
105 /* wait for end of transfer */
106 while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
107 cpu_relax();
108
109 value = MACB_BFEXT(DATA, macb_readl(bp, MAN));
110
111 return value;
112 }
113
macb_mdio_write(struct mii_bus * bus,int mii_id,int regnum,u16 value)114 static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
115 u16 value)
116 {
117 struct macb *bp = bus->priv;
118
119 macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
120 | MACB_BF(RW, MACB_MAN_WRITE)
121 | MACB_BF(PHYA, mii_id)
122 | MACB_BF(REGA, regnum)
123 | MACB_BF(CODE, MACB_MAN_CODE)
124 | MACB_BF(DATA, value)));
125
126 /* wait for end of transfer */
127 while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
128 cpu_relax();
129
130 return 0;
131 }
132
macb_mdio_reset(struct mii_bus * bus)133 static int macb_mdio_reset(struct mii_bus *bus)
134 {
135 return 0;
136 }
137
macb_handle_link_change(struct net_device * dev)138 static void macb_handle_link_change(struct net_device *dev)
139 {
140 struct macb *bp = netdev_priv(dev);
141 struct phy_device *phydev = bp->phy_dev;
142 unsigned long flags;
143
144 int status_change = 0;
145
146 spin_lock_irqsave(&bp->lock, flags);
147
148 if (phydev->link) {
149 if ((bp->speed != phydev->speed) ||
150 (bp->duplex != phydev->duplex)) {
151 u32 reg;
152
153 reg = macb_readl(bp, NCFGR);
154 reg &= ~(MACB_BIT(SPD) | MACB_BIT(FD));
155
156 if (phydev->duplex)
157 reg |= MACB_BIT(FD);
158 if (phydev->speed == SPEED_100)
159 reg |= MACB_BIT(SPD);
160
161 macb_writel(bp, NCFGR, reg);
162
163 bp->speed = phydev->speed;
164 bp->duplex = phydev->duplex;
165 status_change = 1;
166 }
167 }
168
169 if (phydev->link != bp->link) {
170 if (!phydev->link) {
171 bp->speed = 0;
172 bp->duplex = -1;
173 }
174 bp->link = phydev->link;
175
176 status_change = 1;
177 }
178
179 spin_unlock_irqrestore(&bp->lock, flags);
180
181 if (status_change) {
182 if (phydev->link)
183 netdev_info(dev, "link up (%d/%s)\n",
184 phydev->speed,
185 phydev->duplex == DUPLEX_FULL ?
186 "Full" : "Half");
187 else
188 netdev_info(dev, "link down\n");
189 }
190 }
191
192 /* based on au1000_eth. c*/
macb_mii_probe(struct net_device * dev)193 static int macb_mii_probe(struct net_device *dev)
194 {
195 struct macb *bp = netdev_priv(dev);
196 struct phy_device *phydev;
197 int ret;
198
199 phydev = phy_find_first(bp->mii_bus);
200 if (!phydev) {
201 netdev_err(dev, "no PHY found\n");
202 return -1;
203 }
204
205 /* TODO : add pin_irq */
206
207 /* attach the mac to the phy */
208 ret = phy_connect_direct(dev, phydev, &macb_handle_link_change, 0,
209 bp->phy_interface);
210 if (ret) {
211 netdev_err(dev, "Could not attach to PHY\n");
212 return ret;
213 }
214
215 /* mask with MAC supported features */
216 phydev->supported &= PHY_BASIC_FEATURES;
217
218 phydev->advertising = phydev->supported;
219
220 bp->link = 0;
221 bp->speed = 0;
222 bp->duplex = -1;
223 bp->phy_dev = phydev;
224
225 return 0;
226 }
227
macb_mii_init(struct macb * bp)228 static int macb_mii_init(struct macb *bp)
229 {
230 struct macb_platform_data *pdata;
231 int err = -ENXIO, i;
232
233 /* Enable management port */
234 macb_writel(bp, NCR, MACB_BIT(MPE));
235
236 bp->mii_bus = mdiobus_alloc();
237 if (bp->mii_bus == NULL) {
238 err = -ENOMEM;
239 goto err_out;
240 }
241
242 bp->mii_bus->name = "MACB_mii_bus";
243 bp->mii_bus->read = &macb_mdio_read;
244 bp->mii_bus->write = &macb_mdio_write;
245 bp->mii_bus->reset = &macb_mdio_reset;
246 snprintf(bp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
247 bp->pdev->name, bp->pdev->id);
248 bp->mii_bus->priv = bp;
249 bp->mii_bus->parent = &bp->dev->dev;
250 pdata = bp->pdev->dev.platform_data;
251
252 if (pdata)
253 bp->mii_bus->phy_mask = pdata->phy_mask;
254
255 bp->mii_bus->irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
256 if (!bp->mii_bus->irq) {
257 err = -ENOMEM;
258 goto err_out_free_mdiobus;
259 }
260
261 for (i = 0; i < PHY_MAX_ADDR; i++)
262 bp->mii_bus->irq[i] = PHY_POLL;
263
264 dev_set_drvdata(&bp->dev->dev, bp->mii_bus);
265
266 if (mdiobus_register(bp->mii_bus))
267 goto err_out_free_mdio_irq;
268
269 if (macb_mii_probe(bp->dev) != 0) {
270 goto err_out_unregister_bus;
271 }
272
273 return 0;
274
275 err_out_unregister_bus:
276 mdiobus_unregister(bp->mii_bus);
277 err_out_free_mdio_irq:
278 kfree(bp->mii_bus->irq);
279 err_out_free_mdiobus:
280 mdiobus_free(bp->mii_bus);
281 err_out:
282 return err;
283 }
284
macb_update_stats(struct macb * bp)285 static void macb_update_stats(struct macb *bp)
286 {
287 u32 __iomem *reg = bp->regs + MACB_PFR;
288 u32 *p = &bp->hw_stats.macb.rx_pause_frames;
289 u32 *end = &bp->hw_stats.macb.tx_pause_frames + 1;
290
291 WARN_ON((unsigned long)(end - p - 1) != (MACB_TPF - MACB_PFR) / 4);
292
293 for(; p < end; p++, reg++)
294 *p += __raw_readl(reg);
295 }
296
macb_tx(struct macb * bp)297 static void macb_tx(struct macb *bp)
298 {
299 unsigned int tail;
300 unsigned int head;
301 u32 status;
302
303 status = macb_readl(bp, TSR);
304 macb_writel(bp, TSR, status);
305
306 netdev_dbg(bp->dev, "macb_tx status = %02lx\n", (unsigned long)status);
307
308 if (status & (MACB_BIT(UND) | MACB_BIT(TSR_RLE))) {
309 int i;
310 netdev_err(bp->dev, "TX %s, resetting buffers\n",
311 status & MACB_BIT(UND) ?
312 "underrun" : "retry limit exceeded");
313
314 /* Transfer ongoing, disable transmitter, to avoid confusion */
315 if (status & MACB_BIT(TGO))
316 macb_writel(bp, NCR, macb_readl(bp, NCR) & ~MACB_BIT(TE));
317
318 head = bp->tx_head;
319
320 /*Mark all the buffer as used to avoid sending a lost buffer*/
321 for (i = 0; i < TX_RING_SIZE; i++)
322 bp->tx_ring[i].ctrl = MACB_BIT(TX_USED);
323
324 /* Add wrap bit */
325 bp->tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP);
326
327 /* free transmit buffer in upper layer*/
328 for (tail = bp->tx_tail; tail != head; tail = NEXT_TX(tail)) {
329 struct ring_info *rp = &bp->tx_skb[tail];
330 struct sk_buff *skb = rp->skb;
331
332 BUG_ON(skb == NULL);
333
334 rmb();
335
336 dma_unmap_single(&bp->pdev->dev, rp->mapping, skb->len,
337 DMA_TO_DEVICE);
338 rp->skb = NULL;
339 dev_kfree_skb_irq(skb);
340 }
341
342 bp->tx_head = bp->tx_tail = 0;
343
344 /* Enable the transmitter again */
345 if (status & MACB_BIT(TGO))
346 macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TE));
347 }
348
349 if (!(status & MACB_BIT(COMP)))
350 /*
351 * This may happen when a buffer becomes complete
352 * between reading the ISR and scanning the
353 * descriptors. Nothing to worry about.
354 */
355 return;
356
357 head = bp->tx_head;
358 for (tail = bp->tx_tail; tail != head; tail = NEXT_TX(tail)) {
359 struct ring_info *rp = &bp->tx_skb[tail];
360 struct sk_buff *skb = rp->skb;
361 u32 bufstat;
362
363 BUG_ON(skb == NULL);
364
365 rmb();
366 bufstat = bp->tx_ring[tail].ctrl;
367
368 if (!(bufstat & MACB_BIT(TX_USED)))
369 break;
370
371 netdev_dbg(bp->dev, "skb %u (data %p) TX complete\n",
372 tail, skb->data);
373 dma_unmap_single(&bp->pdev->dev, rp->mapping, skb->len,
374 DMA_TO_DEVICE);
375 bp->stats.tx_packets++;
376 bp->stats.tx_bytes += skb->len;
377 rp->skb = NULL;
378 dev_kfree_skb_irq(skb);
379 }
380
381 bp->tx_tail = tail;
382 if (netif_queue_stopped(bp->dev) &&
383 TX_BUFFS_AVAIL(bp) > MACB_TX_WAKEUP_THRESH)
384 netif_wake_queue(bp->dev);
385 }
386
macb_rx_frame(struct macb * bp,unsigned int first_frag,unsigned int last_frag)387 static int macb_rx_frame(struct macb *bp, unsigned int first_frag,
388 unsigned int last_frag)
389 {
390 unsigned int len;
391 unsigned int frag;
392 unsigned int offset = 0;
393 struct sk_buff *skb;
394
395 len = MACB_BFEXT(RX_FRMLEN, bp->rx_ring[last_frag].ctrl);
396
397 netdev_dbg(bp->dev, "macb_rx_frame frags %u - %u (len %u)\n",
398 first_frag, last_frag, len);
399
400 skb = dev_alloc_skb(len + RX_OFFSET);
401 if (!skb) {
402 bp->stats.rx_dropped++;
403 for (frag = first_frag; ; frag = NEXT_RX(frag)) {
404 bp->rx_ring[frag].addr &= ~MACB_BIT(RX_USED);
405 if (frag == last_frag)
406 break;
407 }
408 wmb();
409 return 1;
410 }
411
412 skb_reserve(skb, RX_OFFSET);
413 skb_checksum_none_assert(skb);
414 skb_put(skb, len);
415
416 for (frag = first_frag; ; frag = NEXT_RX(frag)) {
417 unsigned int frag_len = RX_BUFFER_SIZE;
418
419 if (offset + frag_len > len) {
420 BUG_ON(frag != last_frag);
421 frag_len = len - offset;
422 }
423 skb_copy_to_linear_data_offset(skb, offset,
424 (bp->rx_buffers +
425 (RX_BUFFER_SIZE * frag)),
426 frag_len);
427 offset += RX_BUFFER_SIZE;
428 bp->rx_ring[frag].addr &= ~MACB_BIT(RX_USED);
429 wmb();
430
431 if (frag == last_frag)
432 break;
433 }
434
435 skb->protocol = eth_type_trans(skb, bp->dev);
436
437 bp->stats.rx_packets++;
438 bp->stats.rx_bytes += len;
439 netdev_dbg(bp->dev, "received skb of length %u, csum: %08x\n",
440 skb->len, skb->csum);
441 netif_receive_skb(skb);
442
443 return 0;
444 }
445
446 /* Mark DMA descriptors from begin up to and not including end as unused */
discard_partial_frame(struct macb * bp,unsigned int begin,unsigned int end)447 static void discard_partial_frame(struct macb *bp, unsigned int begin,
448 unsigned int end)
449 {
450 unsigned int frag;
451
452 for (frag = begin; frag != end; frag = NEXT_RX(frag))
453 bp->rx_ring[frag].addr &= ~MACB_BIT(RX_USED);
454 wmb();
455
456 /*
457 * When this happens, the hardware stats registers for
458 * whatever caused this is updated, so we don't have to record
459 * anything.
460 */
461 }
462
macb_rx(struct macb * bp,int budget)463 static int macb_rx(struct macb *bp, int budget)
464 {
465 int received = 0;
466 unsigned int tail = bp->rx_tail;
467 int first_frag = -1;
468
469 for (; budget > 0; tail = NEXT_RX(tail)) {
470 u32 addr, ctrl;
471
472 rmb();
473 addr = bp->rx_ring[tail].addr;
474 ctrl = bp->rx_ring[tail].ctrl;
475
476 if (!(addr & MACB_BIT(RX_USED)))
477 break;
478
479 if (ctrl & MACB_BIT(RX_SOF)) {
480 if (first_frag != -1)
481 discard_partial_frame(bp, first_frag, tail);
482 first_frag = tail;
483 }
484
485 if (ctrl & MACB_BIT(RX_EOF)) {
486 int dropped;
487 BUG_ON(first_frag == -1);
488
489 dropped = macb_rx_frame(bp, first_frag, tail);
490 first_frag = -1;
491 if (!dropped) {
492 received++;
493 budget--;
494 }
495 }
496 }
497
498 if (first_frag != -1)
499 bp->rx_tail = first_frag;
500 else
501 bp->rx_tail = tail;
502
503 return received;
504 }
505
macb_poll(struct napi_struct * napi,int budget)506 static int macb_poll(struct napi_struct *napi, int budget)
507 {
508 struct macb *bp = container_of(napi, struct macb, napi);
509 int work_done;
510 u32 status;
511
512 status = macb_readl(bp, RSR);
513 macb_writel(bp, RSR, status);
514
515 work_done = 0;
516
517 netdev_dbg(bp->dev, "poll: status = %08lx, budget = %d\n",
518 (unsigned long)status, budget);
519
520 work_done = macb_rx(bp, budget);
521 if (work_done < budget) {
522 napi_complete(napi);
523
524 /*
525 * We've done what we can to clean the buffers. Make sure we
526 * get notified when new packets arrive.
527 */
528 macb_writel(bp, IER, MACB_RX_INT_FLAGS);
529 }
530
531 /* TODO: Handle errors */
532
533 return work_done;
534 }
535
macb_interrupt(int irq,void * dev_id)536 static irqreturn_t macb_interrupt(int irq, void *dev_id)
537 {
538 struct net_device *dev = dev_id;
539 struct macb *bp = netdev_priv(dev);
540 u32 status;
541
542 status = macb_readl(bp, ISR);
543
544 if (unlikely(!status))
545 return IRQ_NONE;
546
547 spin_lock(&bp->lock);
548
549 while (status) {
550 /* close possible race with dev_close */
551 if (unlikely(!netif_running(dev))) {
552 macb_writel(bp, IDR, ~0UL);
553 break;
554 }
555
556 if (status & MACB_RX_INT_FLAGS) {
557 /*
558 * There's no point taking any more interrupts
559 * until we have processed the buffers. The
560 * scheduling call may fail if the poll routine
561 * is already scheduled, so disable interrupts
562 * now.
563 */
564 macb_writel(bp, IDR, MACB_RX_INT_FLAGS);
565
566 if (napi_schedule_prep(&bp->napi)) {
567 netdev_dbg(bp->dev, "scheduling RX softirq\n");
568 __napi_schedule(&bp->napi);
569 }
570 }
571
572 if (status & (MACB_BIT(TCOMP) | MACB_BIT(ISR_TUND) |
573 MACB_BIT(ISR_RLE)))
574 macb_tx(bp);
575
576 /*
577 * Link change detection isn't possible with RMII, so we'll
578 * add that if/when we get our hands on a full-blown MII PHY.
579 */
580
581 if (status & MACB_BIT(ISR_ROVR)) {
582 /* We missed at least one packet */
583 if (macb_is_gem(bp))
584 bp->hw_stats.gem.rx_overruns++;
585 else
586 bp->hw_stats.macb.rx_overruns++;
587 }
588
589 if (status & MACB_BIT(HRESP)) {
590 /*
591 * TODO: Reset the hardware, and maybe move the
592 * netdev_err to a lower-priority context as well
593 * (work queue?)
594 */
595 netdev_err(dev, "DMA bus error: HRESP not OK\n");
596 }
597
598 status = macb_readl(bp, ISR);
599 }
600
601 spin_unlock(&bp->lock);
602
603 return IRQ_HANDLED;
604 }
605
606 #ifdef CONFIG_NET_POLL_CONTROLLER
607 /*
608 * Polling receive - used by netconsole and other diagnostic tools
609 * to allow network i/o with interrupts disabled.
610 */
macb_poll_controller(struct net_device * dev)611 static void macb_poll_controller(struct net_device *dev)
612 {
613 unsigned long flags;
614
615 local_irq_save(flags);
616 macb_interrupt(dev->irq, dev);
617 local_irq_restore(flags);
618 }
619 #endif
620
macb_start_xmit(struct sk_buff * skb,struct net_device * dev)621 static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
622 {
623 struct macb *bp = netdev_priv(dev);
624 dma_addr_t mapping;
625 unsigned int len, entry;
626 u32 ctrl;
627 unsigned long flags;
628
629 #ifdef DEBUG
630 netdev_dbg(bp->dev,
631 "start_xmit: len %u head %p data %p tail %p end %p\n",
632 skb->len, skb->head, skb->data,
633 skb_tail_pointer(skb), skb_end_pointer(skb));
634 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_OFFSET, 16, 1,
635 skb->data, 16, true);
636 #endif
637
638 len = skb->len;
639 spin_lock_irqsave(&bp->lock, flags);
640
641 /* This is a hard error, log it. */
642 if (TX_BUFFS_AVAIL(bp) < 1) {
643 netif_stop_queue(dev);
644 spin_unlock_irqrestore(&bp->lock, flags);
645 netdev_err(bp->dev, "BUG! Tx Ring full when queue awake!\n");
646 netdev_dbg(bp->dev, "tx_head = %u, tx_tail = %u\n",
647 bp->tx_head, bp->tx_tail);
648 return NETDEV_TX_BUSY;
649 }
650
651 entry = bp->tx_head;
652 netdev_dbg(bp->dev, "Allocated ring entry %u\n", entry);
653 mapping = dma_map_single(&bp->pdev->dev, skb->data,
654 len, DMA_TO_DEVICE);
655 bp->tx_skb[entry].skb = skb;
656 bp->tx_skb[entry].mapping = mapping;
657 netdev_dbg(bp->dev, "Mapped skb data %p to DMA addr %08lx\n",
658 skb->data, (unsigned long)mapping);
659
660 ctrl = MACB_BF(TX_FRMLEN, len);
661 ctrl |= MACB_BIT(TX_LAST);
662 if (entry == (TX_RING_SIZE - 1))
663 ctrl |= MACB_BIT(TX_WRAP);
664
665 bp->tx_ring[entry].addr = mapping;
666 bp->tx_ring[entry].ctrl = ctrl;
667 wmb();
668
669 entry = NEXT_TX(entry);
670 bp->tx_head = entry;
671
672 skb_tx_timestamp(skb);
673
674 macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
675
676 if (TX_BUFFS_AVAIL(bp) < 1)
677 netif_stop_queue(dev);
678
679 spin_unlock_irqrestore(&bp->lock, flags);
680
681 return NETDEV_TX_OK;
682 }
683
macb_free_consistent(struct macb * bp)684 static void macb_free_consistent(struct macb *bp)
685 {
686 if (bp->tx_skb) {
687 kfree(bp->tx_skb);
688 bp->tx_skb = NULL;
689 }
690 if (bp->rx_ring) {
691 dma_free_coherent(&bp->pdev->dev, RX_RING_BYTES,
692 bp->rx_ring, bp->rx_ring_dma);
693 bp->rx_ring = NULL;
694 }
695 if (bp->tx_ring) {
696 dma_free_coherent(&bp->pdev->dev, TX_RING_BYTES,
697 bp->tx_ring, bp->tx_ring_dma);
698 bp->tx_ring = NULL;
699 }
700 if (bp->rx_buffers) {
701 dma_free_coherent(&bp->pdev->dev,
702 RX_RING_SIZE * RX_BUFFER_SIZE,
703 bp->rx_buffers, bp->rx_buffers_dma);
704 bp->rx_buffers = NULL;
705 }
706 }
707
macb_alloc_consistent(struct macb * bp)708 static int macb_alloc_consistent(struct macb *bp)
709 {
710 int size;
711
712 size = TX_RING_SIZE * sizeof(struct ring_info);
713 bp->tx_skb = kmalloc(size, GFP_KERNEL);
714 if (!bp->tx_skb)
715 goto out_err;
716
717 size = RX_RING_BYTES;
718 bp->rx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
719 &bp->rx_ring_dma, GFP_KERNEL);
720 if (!bp->rx_ring)
721 goto out_err;
722 netdev_dbg(bp->dev,
723 "Allocated RX ring of %d bytes at %08lx (mapped %p)\n",
724 size, (unsigned long)bp->rx_ring_dma, bp->rx_ring);
725
726 size = TX_RING_BYTES;
727 bp->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
728 &bp->tx_ring_dma, GFP_KERNEL);
729 if (!bp->tx_ring)
730 goto out_err;
731 netdev_dbg(bp->dev,
732 "Allocated TX ring of %d bytes at %08lx (mapped %p)\n",
733 size, (unsigned long)bp->tx_ring_dma, bp->tx_ring);
734
735 size = RX_RING_SIZE * RX_BUFFER_SIZE;
736 bp->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size,
737 &bp->rx_buffers_dma, GFP_KERNEL);
738 if (!bp->rx_buffers)
739 goto out_err;
740 netdev_dbg(bp->dev,
741 "Allocated RX buffers of %d bytes at %08lx (mapped %p)\n",
742 size, (unsigned long)bp->rx_buffers_dma, bp->rx_buffers);
743
744 return 0;
745
746 out_err:
747 macb_free_consistent(bp);
748 return -ENOMEM;
749 }
750
macb_init_rings(struct macb * bp)751 static void macb_init_rings(struct macb *bp)
752 {
753 int i;
754 dma_addr_t addr;
755
756 addr = bp->rx_buffers_dma;
757 for (i = 0; i < RX_RING_SIZE; i++) {
758 bp->rx_ring[i].addr = addr;
759 bp->rx_ring[i].ctrl = 0;
760 addr += RX_BUFFER_SIZE;
761 }
762 bp->rx_ring[RX_RING_SIZE - 1].addr |= MACB_BIT(RX_WRAP);
763
764 for (i = 0; i < TX_RING_SIZE; i++) {
765 bp->tx_ring[i].addr = 0;
766 bp->tx_ring[i].ctrl = MACB_BIT(TX_USED);
767 }
768 bp->tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP);
769
770 bp->rx_tail = bp->tx_head = bp->tx_tail = 0;
771 }
772
macb_reset_hw(struct macb * bp)773 static void macb_reset_hw(struct macb *bp)
774 {
775 /* Make sure we have the write buffer for ourselves */
776 wmb();
777
778 /*
779 * Disable RX and TX (XXX: Should we halt the transmission
780 * more gracefully?)
781 */
782 macb_writel(bp, NCR, 0);
783
784 /* Clear the stats registers (XXX: Update stats first?) */
785 macb_writel(bp, NCR, MACB_BIT(CLRSTAT));
786
787 /* Clear all status flags */
788 macb_writel(bp, TSR, ~0UL);
789 macb_writel(bp, RSR, ~0UL);
790
791 /* Disable all interrupts */
792 macb_writel(bp, IDR, ~0UL);
793 macb_readl(bp, ISR);
794 }
795
gem_mdc_clk_div(struct macb * bp)796 static u32 gem_mdc_clk_div(struct macb *bp)
797 {
798 u32 config;
799 unsigned long pclk_hz = clk_get_rate(bp->pclk);
800
801 if (pclk_hz <= 20000000)
802 config = GEM_BF(CLK, GEM_CLK_DIV8);
803 else if (pclk_hz <= 40000000)
804 config = GEM_BF(CLK, GEM_CLK_DIV16);
805 else if (pclk_hz <= 80000000)
806 config = GEM_BF(CLK, GEM_CLK_DIV32);
807 else if (pclk_hz <= 120000000)
808 config = GEM_BF(CLK, GEM_CLK_DIV48);
809 else if (pclk_hz <= 160000000)
810 config = GEM_BF(CLK, GEM_CLK_DIV64);
811 else
812 config = GEM_BF(CLK, GEM_CLK_DIV96);
813
814 return config;
815 }
816
macb_mdc_clk_div(struct macb * bp)817 static u32 macb_mdc_clk_div(struct macb *bp)
818 {
819 u32 config;
820 unsigned long pclk_hz;
821
822 if (macb_is_gem(bp))
823 return gem_mdc_clk_div(bp);
824
825 pclk_hz = clk_get_rate(bp->pclk);
826 if (pclk_hz <= 20000000)
827 config = MACB_BF(CLK, MACB_CLK_DIV8);
828 else if (pclk_hz <= 40000000)
829 config = MACB_BF(CLK, MACB_CLK_DIV16);
830 else if (pclk_hz <= 80000000)
831 config = MACB_BF(CLK, MACB_CLK_DIV32);
832 else
833 config = MACB_BF(CLK, MACB_CLK_DIV64);
834
835 return config;
836 }
837
838 /*
839 * Get the DMA bus width field of the network configuration register that we
840 * should program. We find the width from decoding the design configuration
841 * register to find the maximum supported data bus width.
842 */
macb_dbw(struct macb * bp)843 static u32 macb_dbw(struct macb *bp)
844 {
845 if (!macb_is_gem(bp))
846 return 0;
847
848 switch (GEM_BFEXT(DBWDEF, gem_readl(bp, DCFG1))) {
849 case 4:
850 return GEM_BF(DBW, GEM_DBW128);
851 case 2:
852 return GEM_BF(DBW, GEM_DBW64);
853 case 1:
854 default:
855 return GEM_BF(DBW, GEM_DBW32);
856 }
857 }
858
859 /*
860 * Configure the receive DMA engine to use the correct receive buffer size.
861 * This is a configurable parameter for GEM.
862 */
macb_configure_dma(struct macb * bp)863 static void macb_configure_dma(struct macb *bp)
864 {
865 u32 dmacfg;
866
867 if (macb_is_gem(bp)) {
868 dmacfg = gem_readl(bp, DMACFG) & ~GEM_BF(RXBS, -1L);
869 dmacfg |= GEM_BF(RXBS, RX_BUFFER_SIZE / 64);
870 gem_writel(bp, DMACFG, dmacfg);
871 }
872 }
873
macb_init_hw(struct macb * bp)874 static void macb_init_hw(struct macb *bp)
875 {
876 u32 config;
877
878 macb_reset_hw(bp);
879 __macb_set_hwaddr(bp);
880
881 config = macb_mdc_clk_div(bp);
882 config |= MACB_BIT(PAE); /* PAuse Enable */
883 config |= MACB_BIT(DRFCS); /* Discard Rx FCS */
884 config |= MACB_BIT(BIG); /* Receive oversized frames */
885 if (bp->dev->flags & IFF_PROMISC)
886 config |= MACB_BIT(CAF); /* Copy All Frames */
887 if (!(bp->dev->flags & IFF_BROADCAST))
888 config |= MACB_BIT(NBC); /* No BroadCast */
889 config |= macb_dbw(bp);
890 macb_writel(bp, NCFGR, config);
891
892 macb_configure_dma(bp);
893
894 /* Initialize TX and RX buffers */
895 macb_writel(bp, RBQP, bp->rx_ring_dma);
896 macb_writel(bp, TBQP, bp->tx_ring_dma);
897
898 /* Enable TX and RX */
899 macb_writel(bp, NCR, MACB_BIT(RE) | MACB_BIT(TE) | MACB_BIT(MPE));
900
901 /* Enable interrupts */
902 macb_writel(bp, IER, (MACB_BIT(RCOMP)
903 | MACB_BIT(RXUBR)
904 | MACB_BIT(ISR_TUND)
905 | MACB_BIT(ISR_RLE)
906 | MACB_BIT(TXERR)
907 | MACB_BIT(TCOMP)
908 | MACB_BIT(ISR_ROVR)
909 | MACB_BIT(HRESP)));
910
911 }
912
913 /*
914 * The hash address register is 64 bits long and takes up two
915 * locations in the memory map. The least significant bits are stored
916 * in EMAC_HSL and the most significant bits in EMAC_HSH.
917 *
918 * The unicast hash enable and the multicast hash enable bits in the
919 * network configuration register enable the reception of hash matched
920 * frames. The destination address is reduced to a 6 bit index into
921 * the 64 bit hash register using the following hash function. The
922 * hash function is an exclusive or of every sixth bit of the
923 * destination address.
924 *
925 * hi[5] = da[5] ^ da[11] ^ da[17] ^ da[23] ^ da[29] ^ da[35] ^ da[41] ^ da[47]
926 * hi[4] = da[4] ^ da[10] ^ da[16] ^ da[22] ^ da[28] ^ da[34] ^ da[40] ^ da[46]
927 * hi[3] = da[3] ^ da[09] ^ da[15] ^ da[21] ^ da[27] ^ da[33] ^ da[39] ^ da[45]
928 * hi[2] = da[2] ^ da[08] ^ da[14] ^ da[20] ^ da[26] ^ da[32] ^ da[38] ^ da[44]
929 * hi[1] = da[1] ^ da[07] ^ da[13] ^ da[19] ^ da[25] ^ da[31] ^ da[37] ^ da[43]
930 * hi[0] = da[0] ^ da[06] ^ da[12] ^ da[18] ^ da[24] ^ da[30] ^ da[36] ^ da[42]
931 *
932 * da[0] represents the least significant bit of the first byte
933 * received, that is, the multicast/unicast indicator, and da[47]
934 * represents the most significant bit of the last byte received. If
935 * the hash index, hi[n], points to a bit that is set in the hash
936 * register then the frame will be matched according to whether the
937 * frame is multicast or unicast. A multicast match will be signalled
938 * if the multicast hash enable bit is set, da[0] is 1 and the hash
939 * index points to a bit set in the hash register. A unicast match
940 * will be signalled if the unicast hash enable bit is set, da[0] is 0
941 * and the hash index points to a bit set in the hash register. To
942 * receive all multicast frames, the hash register should be set with
943 * all ones and the multicast hash enable bit should be set in the
944 * network configuration register.
945 */
946
hash_bit_value(int bitnr,__u8 * addr)947 static inline int hash_bit_value(int bitnr, __u8 *addr)
948 {
949 if (addr[bitnr / 8] & (1 << (bitnr % 8)))
950 return 1;
951 return 0;
952 }
953
954 /*
955 * Return the hash index value for the specified address.
956 */
hash_get_index(__u8 * addr)957 static int hash_get_index(__u8 *addr)
958 {
959 int i, j, bitval;
960 int hash_index = 0;
961
962 for (j = 0; j < 6; j++) {
963 for (i = 0, bitval = 0; i < 8; i++)
964 bitval ^= hash_bit_value(i*6 + j, addr);
965
966 hash_index |= (bitval << j);
967 }
968
969 return hash_index;
970 }
971
972 /*
973 * Add multicast addresses to the internal multicast-hash table.
974 */
macb_sethashtable(struct net_device * dev)975 static void macb_sethashtable(struct net_device *dev)
976 {
977 struct netdev_hw_addr *ha;
978 unsigned long mc_filter[2];
979 unsigned int bitnr;
980 struct macb *bp = netdev_priv(dev);
981
982 mc_filter[0] = mc_filter[1] = 0;
983
984 netdev_for_each_mc_addr(ha, dev) {
985 bitnr = hash_get_index(ha->addr);
986 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
987 }
988
989 macb_or_gem_writel(bp, HRB, mc_filter[0]);
990 macb_or_gem_writel(bp, HRT, mc_filter[1]);
991 }
992
993 /*
994 * Enable/Disable promiscuous and multicast modes.
995 */
macb_set_rx_mode(struct net_device * dev)996 static void macb_set_rx_mode(struct net_device *dev)
997 {
998 unsigned long cfg;
999 struct macb *bp = netdev_priv(dev);
1000
1001 cfg = macb_readl(bp, NCFGR);
1002
1003 if (dev->flags & IFF_PROMISC)
1004 /* Enable promiscuous mode */
1005 cfg |= MACB_BIT(CAF);
1006 else if (dev->flags & (~IFF_PROMISC))
1007 /* Disable promiscuous mode */
1008 cfg &= ~MACB_BIT(CAF);
1009
1010 if (dev->flags & IFF_ALLMULTI) {
1011 /* Enable all multicast mode */
1012 macb_or_gem_writel(bp, HRB, -1);
1013 macb_or_gem_writel(bp, HRT, -1);
1014 cfg |= MACB_BIT(NCFGR_MTI);
1015 } else if (!netdev_mc_empty(dev)) {
1016 /* Enable specific multicasts */
1017 macb_sethashtable(dev);
1018 cfg |= MACB_BIT(NCFGR_MTI);
1019 } else if (dev->flags & (~IFF_ALLMULTI)) {
1020 /* Disable all multicast mode */
1021 macb_or_gem_writel(bp, HRB, 0);
1022 macb_or_gem_writel(bp, HRT, 0);
1023 cfg &= ~MACB_BIT(NCFGR_MTI);
1024 }
1025
1026 macb_writel(bp, NCFGR, cfg);
1027 }
1028
macb_open(struct net_device * dev)1029 static int macb_open(struct net_device *dev)
1030 {
1031 struct macb *bp = netdev_priv(dev);
1032 int err;
1033
1034 netdev_dbg(bp->dev, "open\n");
1035
1036 /* if the phy is not yet register, retry later*/
1037 if (!bp->phy_dev)
1038 return -EAGAIN;
1039
1040 if (!is_valid_ether_addr(dev->dev_addr))
1041 return -EADDRNOTAVAIL;
1042
1043 err = macb_alloc_consistent(bp);
1044 if (err) {
1045 netdev_err(dev, "Unable to allocate DMA memory (error %d)\n",
1046 err);
1047 return err;
1048 }
1049
1050 napi_enable(&bp->napi);
1051
1052 macb_init_rings(bp);
1053 macb_init_hw(bp);
1054
1055 /* schedule a link state check */
1056 phy_start(bp->phy_dev);
1057
1058 netif_start_queue(dev);
1059
1060 return 0;
1061 }
1062
macb_close(struct net_device * dev)1063 static int macb_close(struct net_device *dev)
1064 {
1065 struct macb *bp = netdev_priv(dev);
1066 unsigned long flags;
1067
1068 netif_stop_queue(dev);
1069 napi_disable(&bp->napi);
1070
1071 if (bp->phy_dev)
1072 phy_stop(bp->phy_dev);
1073
1074 spin_lock_irqsave(&bp->lock, flags);
1075 macb_reset_hw(bp);
1076 netif_carrier_off(dev);
1077 spin_unlock_irqrestore(&bp->lock, flags);
1078
1079 macb_free_consistent(bp);
1080
1081 return 0;
1082 }
1083
gem_update_stats(struct macb * bp)1084 static void gem_update_stats(struct macb *bp)
1085 {
1086 u32 __iomem *reg = bp->regs + GEM_OTX;
1087 u32 *p = &bp->hw_stats.gem.tx_octets_31_0;
1088 u32 *end = &bp->hw_stats.gem.rx_udp_checksum_errors + 1;
1089
1090 for (; p < end; p++, reg++)
1091 *p += __raw_readl(reg);
1092 }
1093
gem_get_stats(struct macb * bp)1094 static struct net_device_stats *gem_get_stats(struct macb *bp)
1095 {
1096 struct gem_stats *hwstat = &bp->hw_stats.gem;
1097 struct net_device_stats *nstat = &bp->stats;
1098
1099 gem_update_stats(bp);
1100
1101 nstat->rx_errors = (hwstat->rx_frame_check_sequence_errors +
1102 hwstat->rx_alignment_errors +
1103 hwstat->rx_resource_errors +
1104 hwstat->rx_overruns +
1105 hwstat->rx_oversize_frames +
1106 hwstat->rx_jabbers +
1107 hwstat->rx_undersized_frames +
1108 hwstat->rx_length_field_frame_errors);
1109 nstat->tx_errors = (hwstat->tx_late_collisions +
1110 hwstat->tx_excessive_collisions +
1111 hwstat->tx_underrun +
1112 hwstat->tx_carrier_sense_errors);
1113 nstat->multicast = hwstat->rx_multicast_frames;
1114 nstat->collisions = (hwstat->tx_single_collision_frames +
1115 hwstat->tx_multiple_collision_frames +
1116 hwstat->tx_excessive_collisions);
1117 nstat->rx_length_errors = (hwstat->rx_oversize_frames +
1118 hwstat->rx_jabbers +
1119 hwstat->rx_undersized_frames +
1120 hwstat->rx_length_field_frame_errors);
1121 nstat->rx_over_errors = hwstat->rx_resource_errors;
1122 nstat->rx_crc_errors = hwstat->rx_frame_check_sequence_errors;
1123 nstat->rx_frame_errors = hwstat->rx_alignment_errors;
1124 nstat->rx_fifo_errors = hwstat->rx_overruns;
1125 nstat->tx_aborted_errors = hwstat->tx_excessive_collisions;
1126 nstat->tx_carrier_errors = hwstat->tx_carrier_sense_errors;
1127 nstat->tx_fifo_errors = hwstat->tx_underrun;
1128
1129 return nstat;
1130 }
1131
macb_get_stats(struct net_device * dev)1132 static struct net_device_stats *macb_get_stats(struct net_device *dev)
1133 {
1134 struct macb *bp = netdev_priv(dev);
1135 struct net_device_stats *nstat = &bp->stats;
1136 struct macb_stats *hwstat = &bp->hw_stats.macb;
1137
1138 if (macb_is_gem(bp))
1139 return gem_get_stats(bp);
1140
1141 /* read stats from hardware */
1142 macb_update_stats(bp);
1143
1144 /* Convert HW stats into netdevice stats */
1145 nstat->rx_errors = (hwstat->rx_fcs_errors +
1146 hwstat->rx_align_errors +
1147 hwstat->rx_resource_errors +
1148 hwstat->rx_overruns +
1149 hwstat->rx_oversize_pkts +
1150 hwstat->rx_jabbers +
1151 hwstat->rx_undersize_pkts +
1152 hwstat->sqe_test_errors +
1153 hwstat->rx_length_mismatch);
1154 nstat->tx_errors = (hwstat->tx_late_cols +
1155 hwstat->tx_excessive_cols +
1156 hwstat->tx_underruns +
1157 hwstat->tx_carrier_errors);
1158 nstat->collisions = (hwstat->tx_single_cols +
1159 hwstat->tx_multiple_cols +
1160 hwstat->tx_excessive_cols);
1161 nstat->rx_length_errors = (hwstat->rx_oversize_pkts +
1162 hwstat->rx_jabbers +
1163 hwstat->rx_undersize_pkts +
1164 hwstat->rx_length_mismatch);
1165 nstat->rx_over_errors = hwstat->rx_resource_errors +
1166 hwstat->rx_overruns;
1167 nstat->rx_crc_errors = hwstat->rx_fcs_errors;
1168 nstat->rx_frame_errors = hwstat->rx_align_errors;
1169 nstat->rx_fifo_errors = hwstat->rx_overruns;
1170 /* XXX: What does "missed" mean? */
1171 nstat->tx_aborted_errors = hwstat->tx_excessive_cols;
1172 nstat->tx_carrier_errors = hwstat->tx_carrier_errors;
1173 nstat->tx_fifo_errors = hwstat->tx_underruns;
1174 /* Don't know about heartbeat or window errors... */
1175
1176 return nstat;
1177 }
1178
macb_get_settings(struct net_device * dev,struct ethtool_cmd * cmd)1179 static int macb_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1180 {
1181 struct macb *bp = netdev_priv(dev);
1182 struct phy_device *phydev = bp->phy_dev;
1183
1184 if (!phydev)
1185 return -ENODEV;
1186
1187 return phy_ethtool_gset(phydev, cmd);
1188 }
1189
macb_set_settings(struct net_device * dev,struct ethtool_cmd * cmd)1190 static int macb_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1191 {
1192 struct macb *bp = netdev_priv(dev);
1193 struct phy_device *phydev = bp->phy_dev;
1194
1195 if (!phydev)
1196 return -ENODEV;
1197
1198 return phy_ethtool_sset(phydev, cmd);
1199 }
1200
macb_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)1201 static void macb_get_drvinfo(struct net_device *dev,
1202 struct ethtool_drvinfo *info)
1203 {
1204 struct macb *bp = netdev_priv(dev);
1205
1206 strcpy(info->driver, bp->pdev->dev.driver->name);
1207 strcpy(info->version, "$Revision: 1.14 $");
1208 strcpy(info->bus_info, dev_name(&bp->pdev->dev));
1209 }
1210
1211 static const struct ethtool_ops macb_ethtool_ops = {
1212 .get_settings = macb_get_settings,
1213 .set_settings = macb_set_settings,
1214 .get_drvinfo = macb_get_drvinfo,
1215 .get_link = ethtool_op_get_link,
1216 };
1217
macb_ioctl(struct net_device * dev,struct ifreq * rq,int cmd)1218 static int macb_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1219 {
1220 struct macb *bp = netdev_priv(dev);
1221 struct phy_device *phydev = bp->phy_dev;
1222
1223 if (!netif_running(dev))
1224 return -EINVAL;
1225
1226 if (!phydev)
1227 return -ENODEV;
1228
1229 return phy_mii_ioctl(phydev, rq, cmd);
1230 }
1231
1232 static const struct net_device_ops macb_netdev_ops = {
1233 .ndo_open = macb_open,
1234 .ndo_stop = macb_close,
1235 .ndo_start_xmit = macb_start_xmit,
1236 .ndo_set_rx_mode = macb_set_rx_mode,
1237 .ndo_get_stats = macb_get_stats,
1238 .ndo_do_ioctl = macb_ioctl,
1239 .ndo_validate_addr = eth_validate_addr,
1240 .ndo_change_mtu = eth_change_mtu,
1241 .ndo_set_mac_address = eth_mac_addr,
1242 #ifdef CONFIG_NET_POLL_CONTROLLER
1243 .ndo_poll_controller = macb_poll_controller,
1244 #endif
1245 };
1246
1247 #if defined(CONFIG_OF)
1248 static const struct of_device_id macb_dt_ids[] = {
1249 { .compatible = "cdns,at32ap7000-macb" },
1250 { .compatible = "cdns,at91sam9260-macb" },
1251 { .compatible = "cdns,macb" },
1252 { .compatible = "cdns,pc302-gem" },
1253 { .compatible = "cdns,gem" },
1254 { /* sentinel */ }
1255 };
1256
1257 MODULE_DEVICE_TABLE(of, macb_dt_ids);
1258
macb_get_phy_mode_dt(struct platform_device * pdev)1259 static int __devinit macb_get_phy_mode_dt(struct platform_device *pdev)
1260 {
1261 struct device_node *np = pdev->dev.of_node;
1262
1263 if (np)
1264 return of_get_phy_mode(np);
1265
1266 return -ENODEV;
1267 }
1268
macb_get_hwaddr_dt(struct macb * bp)1269 static int __devinit macb_get_hwaddr_dt(struct macb *bp)
1270 {
1271 struct device_node *np = bp->pdev->dev.of_node;
1272 if (np) {
1273 const char *mac = of_get_mac_address(np);
1274 if (mac) {
1275 memcpy(bp->dev->dev_addr, mac, ETH_ALEN);
1276 return 0;
1277 }
1278 }
1279
1280 return -ENODEV;
1281 }
1282 #else
macb_get_phy_mode_dt(struct platform_device * pdev)1283 static int __devinit macb_get_phy_mode_dt(struct platform_device *pdev)
1284 {
1285 return -ENODEV;
1286 }
macb_get_hwaddr_dt(struct macb * bp)1287 static int __devinit macb_get_hwaddr_dt(struct macb *bp)
1288 {
1289 return -ENODEV;
1290 }
1291 #endif
1292
macb_probe(struct platform_device * pdev)1293 static int __init macb_probe(struct platform_device *pdev)
1294 {
1295 struct macb_platform_data *pdata;
1296 struct resource *regs;
1297 struct net_device *dev;
1298 struct macb *bp;
1299 struct phy_device *phydev;
1300 u32 config;
1301 int err = -ENXIO;
1302
1303 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1304 if (!regs) {
1305 dev_err(&pdev->dev, "no mmio resource defined\n");
1306 goto err_out;
1307 }
1308
1309 err = -ENOMEM;
1310 dev = alloc_etherdev(sizeof(*bp));
1311 if (!dev) {
1312 dev_err(&pdev->dev, "etherdev alloc failed, aborting.\n");
1313 goto err_out;
1314 }
1315
1316 SET_NETDEV_DEV(dev, &pdev->dev);
1317
1318 /* TODO: Actually, we have some interesting features... */
1319 dev->features |= 0;
1320
1321 bp = netdev_priv(dev);
1322 bp->pdev = pdev;
1323 bp->dev = dev;
1324
1325 spin_lock_init(&bp->lock);
1326
1327 bp->pclk = clk_get(&pdev->dev, "pclk");
1328 if (IS_ERR(bp->pclk)) {
1329 dev_err(&pdev->dev, "failed to get macb_clk\n");
1330 goto err_out_free_dev;
1331 }
1332 clk_enable(bp->pclk);
1333
1334 bp->hclk = clk_get(&pdev->dev, "hclk");
1335 if (IS_ERR(bp->hclk)) {
1336 dev_err(&pdev->dev, "failed to get hclk\n");
1337 goto err_out_put_pclk;
1338 }
1339 clk_enable(bp->hclk);
1340
1341 bp->regs = ioremap(regs->start, resource_size(regs));
1342 if (!bp->regs) {
1343 dev_err(&pdev->dev, "failed to map registers, aborting.\n");
1344 err = -ENOMEM;
1345 goto err_out_disable_clocks;
1346 }
1347
1348 dev->irq = platform_get_irq(pdev, 0);
1349 err = request_irq(dev->irq, macb_interrupt, 0, dev->name, dev);
1350 if (err) {
1351 dev_err(&pdev->dev, "Unable to request IRQ %d (error %d)\n",
1352 dev->irq, err);
1353 goto err_out_iounmap;
1354 }
1355
1356 dev->netdev_ops = &macb_netdev_ops;
1357 netif_napi_add(dev, &bp->napi, macb_poll, 64);
1358 dev->ethtool_ops = &macb_ethtool_ops;
1359
1360 dev->base_addr = regs->start;
1361
1362 /* Set MII management clock divider */
1363 config = macb_mdc_clk_div(bp);
1364 config |= macb_dbw(bp);
1365 macb_writel(bp, NCFGR, config);
1366
1367 err = macb_get_hwaddr_dt(bp);
1368 if (err < 0)
1369 macb_get_hwaddr(bp);
1370
1371 err = macb_get_phy_mode_dt(pdev);
1372 if (err < 0) {
1373 pdata = pdev->dev.platform_data;
1374 if (pdata && pdata->is_rmii)
1375 bp->phy_interface = PHY_INTERFACE_MODE_RMII;
1376 else
1377 bp->phy_interface = PHY_INTERFACE_MODE_MII;
1378 } else {
1379 bp->phy_interface = err;
1380 }
1381
1382 if (bp->phy_interface == PHY_INTERFACE_MODE_RMII)
1383 #if defined(CONFIG_ARCH_AT91)
1384 macb_or_gem_writel(bp, USRIO, (MACB_BIT(RMII) |
1385 MACB_BIT(CLKEN)));
1386 #else
1387 macb_or_gem_writel(bp, USRIO, 0);
1388 #endif
1389 else
1390 #if defined(CONFIG_ARCH_AT91)
1391 macb_or_gem_writel(bp, USRIO, MACB_BIT(CLKEN));
1392 #else
1393 macb_or_gem_writel(bp, USRIO, MACB_BIT(MII));
1394 #endif
1395
1396 bp->tx_pending = DEF_TX_RING_PENDING;
1397
1398 err = register_netdev(dev);
1399 if (err) {
1400 dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
1401 goto err_out_free_irq;
1402 }
1403
1404 if (macb_mii_init(bp) != 0) {
1405 goto err_out_unregister_netdev;
1406 }
1407
1408 platform_set_drvdata(pdev, dev);
1409
1410 netdev_info(dev, "Cadence %s at 0x%08lx irq %d (%pM)\n",
1411 macb_is_gem(bp) ? "GEM" : "MACB", dev->base_addr,
1412 dev->irq, dev->dev_addr);
1413
1414 phydev = bp->phy_dev;
1415 netdev_info(dev, "attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%d)\n",
1416 phydev->drv->name, dev_name(&phydev->dev), phydev->irq);
1417
1418 return 0;
1419
1420 err_out_unregister_netdev:
1421 unregister_netdev(dev);
1422 err_out_free_irq:
1423 free_irq(dev->irq, dev);
1424 err_out_iounmap:
1425 iounmap(bp->regs);
1426 err_out_disable_clocks:
1427 clk_disable(bp->hclk);
1428 clk_put(bp->hclk);
1429 clk_disable(bp->pclk);
1430 err_out_put_pclk:
1431 clk_put(bp->pclk);
1432 err_out_free_dev:
1433 free_netdev(dev);
1434 err_out:
1435 platform_set_drvdata(pdev, NULL);
1436 return err;
1437 }
1438
macb_remove(struct platform_device * pdev)1439 static int __exit macb_remove(struct platform_device *pdev)
1440 {
1441 struct net_device *dev;
1442 struct macb *bp;
1443
1444 dev = platform_get_drvdata(pdev);
1445
1446 if (dev) {
1447 bp = netdev_priv(dev);
1448 if (bp->phy_dev)
1449 phy_disconnect(bp->phy_dev);
1450 mdiobus_unregister(bp->mii_bus);
1451 kfree(bp->mii_bus->irq);
1452 mdiobus_free(bp->mii_bus);
1453 unregister_netdev(dev);
1454 free_irq(dev->irq, dev);
1455 iounmap(bp->regs);
1456 clk_disable(bp->hclk);
1457 clk_put(bp->hclk);
1458 clk_disable(bp->pclk);
1459 clk_put(bp->pclk);
1460 free_netdev(dev);
1461 platform_set_drvdata(pdev, NULL);
1462 }
1463
1464 return 0;
1465 }
1466
1467 #ifdef CONFIG_PM
macb_suspend(struct platform_device * pdev,pm_message_t state)1468 static int macb_suspend(struct platform_device *pdev, pm_message_t state)
1469 {
1470 struct net_device *netdev = platform_get_drvdata(pdev);
1471 struct macb *bp = netdev_priv(netdev);
1472
1473 netif_device_detach(netdev);
1474
1475 clk_disable(bp->hclk);
1476 clk_disable(bp->pclk);
1477
1478 return 0;
1479 }
1480
macb_resume(struct platform_device * pdev)1481 static int macb_resume(struct platform_device *pdev)
1482 {
1483 struct net_device *netdev = platform_get_drvdata(pdev);
1484 struct macb *bp = netdev_priv(netdev);
1485
1486 clk_enable(bp->pclk);
1487 clk_enable(bp->hclk);
1488
1489 netif_device_attach(netdev);
1490
1491 return 0;
1492 }
1493 #else
1494 #define macb_suspend NULL
1495 #define macb_resume NULL
1496 #endif
1497
1498 static struct platform_driver macb_driver = {
1499 .remove = __exit_p(macb_remove),
1500 .suspend = macb_suspend,
1501 .resume = macb_resume,
1502 .driver = {
1503 .name = "macb",
1504 .owner = THIS_MODULE,
1505 .of_match_table = of_match_ptr(macb_dt_ids),
1506 },
1507 };
1508
macb_init(void)1509 static int __init macb_init(void)
1510 {
1511 return platform_driver_probe(&macb_driver, macb_probe);
1512 }
1513
macb_exit(void)1514 static void __exit macb_exit(void)
1515 {
1516 platform_driver_unregister(&macb_driver);
1517 }
1518
1519 module_init(macb_init);
1520 module_exit(macb_exit);
1521
1522 MODULE_LICENSE("GPL");
1523 MODULE_DESCRIPTION("Cadence MACB/GEM Ethernet driver");
1524 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
1525 MODULE_ALIAS("platform:macb");
1526