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