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Linux 2.6.20.7
[linux/fpc-iii.git] / drivers / net / macb.c
blob25b559b5d5ede142390236a0145a327b9bc9df1c
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/netdevice.h>
19 #include <linux/etherdevice.h>
20 #include <linux/mii.h>
21 #include <linux/mutex.h>
22 #include <linux/dma-mapping.h>
23 #include <linux/ethtool.h>
24 #include <linux/platform_device.h>
25
26 #include <asm/arch/board.h>
27
28 #include "macb.h"
29
30 #define to_net_dev(class) container_of(class, struct net_device, class_dev)
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
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_writel(bp, SA1B, bottom);
66 top = cpu_to_le16(*((u16 *)(bp->dev->dev_addr + 4)));
67 macb_writel(bp, SA1T, top);
68 }
69
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_readl(bp, SA1B);
77 top = macb_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 }
89
90 static void macb_enable_mdio(struct macb *bp)
91 {
92 unsigned long flags;
93 u32 reg;
94
95 spin_lock_irqsave(&bp->lock, flags);
96 reg = macb_readl(bp, NCR);
97 reg |= MACB_BIT(MPE);
98 macb_writel(bp, NCR, reg);
99 macb_writel(bp, IER, MACB_BIT(MFD));
100 spin_unlock_irqrestore(&bp->lock, flags);
101 }
102
103 static void macb_disable_mdio(struct macb *bp)
104 {
105 unsigned long flags;
106 u32 reg;
107
108 spin_lock_irqsave(&bp->lock, flags);
109 reg = macb_readl(bp, NCR);
110 reg &= ~MACB_BIT(MPE);
111 macb_writel(bp, NCR, reg);
112 macb_writel(bp, IDR, MACB_BIT(MFD));
113 spin_unlock_irqrestore(&bp->lock, flags);
114 }
115
116 static int macb_mdio_read(struct net_device *dev, int phy_id, int location)
117 {
118 struct macb *bp = netdev_priv(dev);
119 int value;
120
121 mutex_lock(&bp->mdio_mutex);
122
123 macb_enable_mdio(bp);
124 macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
125 | MACB_BF(RW, MACB_MAN_READ)
126 | MACB_BF(PHYA, phy_id)
127 | MACB_BF(REGA, location)
128 | MACB_BF(CODE, MACB_MAN_CODE)));
129
130 wait_for_completion(&bp->mdio_complete);
131
132 value = MACB_BFEXT(DATA, macb_readl(bp, MAN));
133 macb_disable_mdio(bp);
134 mutex_unlock(&bp->mdio_mutex);
135
136 return value;
137 }
138
139 static void macb_mdio_write(struct net_device *dev, int phy_id,
140 int location, int val)
141 {
142 struct macb *bp = netdev_priv(dev);
143
144 dev_dbg(&bp->pdev->dev, "mdio_write %02x:%02x <- %04x\n",
145 phy_id, location, val);
146
147 mutex_lock(&bp->mdio_mutex);
148 macb_enable_mdio(bp);
149
150 macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
151 | MACB_BF(RW, MACB_MAN_WRITE)
152 | MACB_BF(PHYA, phy_id)
153 | MACB_BF(REGA, location)
154 | MACB_BF(CODE, MACB_MAN_CODE)
155 | MACB_BF(DATA, val)));
156
157 wait_for_completion(&bp->mdio_complete);
158
159 macb_disable_mdio(bp);
160 mutex_unlock(&bp->mdio_mutex);
161 }
162
163 static int macb_phy_probe(struct macb *bp)
164 {
165 int phy_address;
166 u16 phyid1, phyid2;
167
168 for (phy_address = 0; phy_address < 32; phy_address++) {
169 phyid1 = macb_mdio_read(bp->dev, phy_address, MII_PHYSID1);
170 phyid2 = macb_mdio_read(bp->dev, phy_address, MII_PHYSID2);
171
172 if (phyid1 != 0xffff && phyid1 != 0x0000
173 && phyid2 != 0xffff && phyid2 != 0x0000)
174 break;
175 }
176
177 if (phy_address == 32)
178 return -ENODEV;
179
180 dev_info(&bp->pdev->dev,
181 "detected PHY at address %d (ID %04x:%04x)\n",
182 phy_address, phyid1, phyid2);
183
184 bp->mii.phy_id = phy_address;
185 return 0;
186 }
187
188 static void macb_set_media(struct macb *bp, int media)
189 {
190 u32 reg;
191
192 spin_lock_irq(&bp->lock);
193 reg = macb_readl(bp, NCFGR);
194 reg &= ~(MACB_BIT(SPD) | MACB_BIT(FD));
195 if (media & (ADVERTISE_100HALF | ADVERTISE_100FULL))
196 reg |= MACB_BIT(SPD);
197 if (media & ADVERTISE_FULL)
198 reg |= MACB_BIT(FD);
199 macb_writel(bp, NCFGR, reg);
200 spin_unlock_irq(&bp->lock);
201 }
202
203 static void macb_check_media(struct macb *bp, int ok_to_print, int init_media)
204 {
205 struct mii_if_info *mii = &bp->mii;
206 unsigned int old_carrier, new_carrier;
207 int advertise, lpa, media, duplex;
208
209 /* if forced media, go no further */
210 if (mii->force_media)
211 return;
212
213 /* check current and old link status */
214 old_carrier = netif_carrier_ok(mii->dev) ? 1 : 0;
215 new_carrier = (unsigned int) mii_link_ok(mii);
216
217 /* if carrier state did not change, assume nothing else did */
218 if (!init_media && old_carrier == new_carrier)
219 return;
220
221 /* no carrier, nothing much to do */
222 if (!new_carrier) {
223 netif_carrier_off(mii->dev);
224 printk(KERN_INFO "%s: link down\n", mii->dev->name);
225 return;
226 }
227
228 /*
229 * we have carrier, see who's on the other end
230 */
231 netif_carrier_on(mii->dev);
232
233 /* get MII advertise and LPA values */
234 if (!init_media && mii->advertising) {
235 advertise = mii->advertising;
236 } else {
237 advertise = mii->mdio_read(mii->dev, mii->phy_id, MII_ADVERTISE);
238 mii->advertising = advertise;
239 }
240 lpa = mii->mdio_read(mii->dev, mii->phy_id, MII_LPA);
241
242 /* figure out media and duplex from advertise and LPA values */
243 media = mii_nway_result(lpa & advertise);
244 duplex = (media & ADVERTISE_FULL) ? 1 : 0;
245
246 if (ok_to_print)
247 printk(KERN_INFO "%s: link up, %sMbps, %s-duplex, lpa 0x%04X\n",
248 mii->dev->name,
249 media & (ADVERTISE_100FULL | ADVERTISE_100HALF) ? "100" : "10",
250 duplex ? "full" : "half", lpa);
251
252 mii->full_duplex = duplex;
253
254 /* Let the MAC know about the new link state */
255 macb_set_media(bp, media);
256 }
257
258 static void macb_update_stats(struct macb *bp)
259 {
260 u32 __iomem *reg = bp->regs + MACB_PFR;
261 u32 *p = &bp->hw_stats.rx_pause_frames;
262 u32 *end = &bp->hw_stats.tx_pause_frames + 1;
263
264 WARN_ON((unsigned long)(end - p - 1) != (MACB_TPF - MACB_PFR) / 4);
265
266 for(; p < end; p++, reg++)
267 *p += __raw_readl(reg);
268 }
269
270 static void macb_periodic_task(struct work_struct *work)
271 {
272 struct macb *bp = container_of(work, struct macb, periodic_task.work);
273
274 macb_update_stats(bp);
275 macb_check_media(bp, 1, 0);
276
277 schedule_delayed_work(&bp->periodic_task, HZ);
278 }
279
280 static void macb_tx(struct macb *bp)
281 {
282 unsigned int tail;
283 unsigned int head;
284 u32 status;
285
286 status = macb_readl(bp, TSR);
287 macb_writel(bp, TSR, status);
288
289 dev_dbg(&bp->pdev->dev, "macb_tx status = %02lx\n",
290 (unsigned long)status);
291
292 if (status & MACB_BIT(UND)) {
293 printk(KERN_ERR "%s: TX underrun, resetting buffers\n",
294 bp->dev->name);
295 bp->tx_head = bp->tx_tail = 0;
296 }
297
298 if (!(status & MACB_BIT(COMP)))
299 /*
300 * This may happen when a buffer becomes complete
301 * between reading the ISR and scanning the
302 * descriptors. Nothing to worry about.
303 */
304 return;
305
306 head = bp->tx_head;
307 for (tail = bp->tx_tail; tail != head; tail = NEXT_TX(tail)) {
308 struct ring_info *rp = &bp->tx_skb[tail];
309 struct sk_buff *skb = rp->skb;
310 u32 bufstat;
311
312 BUG_ON(skb == NULL);
313
314 rmb();
315 bufstat = bp->tx_ring[tail].ctrl;
316
317 if (!(bufstat & MACB_BIT(TX_USED)))
318 break;
319
320 dev_dbg(&bp->pdev->dev, "skb %u (data %p) TX complete\n",
321 tail, skb->data);
322 dma_unmap_single(&bp->pdev->dev, rp->mapping, skb->len,
323 DMA_TO_DEVICE);
324 bp->stats.tx_packets++;
325 bp->stats.tx_bytes += skb->len;
326 rp->skb = NULL;
327 dev_kfree_skb_irq(skb);
328 }
329
330 bp->tx_tail = tail;
331 if (netif_queue_stopped(bp->dev) &&
332 TX_BUFFS_AVAIL(bp) > MACB_TX_WAKEUP_THRESH)
333 netif_wake_queue(bp->dev);
334 }
335
336 static int macb_rx_frame(struct macb *bp, unsigned int first_frag,
337 unsigned int last_frag)
338 {
339 unsigned int len;
340 unsigned int frag;
341 unsigned int offset = 0;
342 struct sk_buff *skb;
343
344 len = MACB_BFEXT(RX_FRMLEN, bp->rx_ring[last_frag].ctrl);
345
346 dev_dbg(&bp->pdev->dev, "macb_rx_frame frags %u - %u (len %u)\n",
347 first_frag, last_frag, len);
348
349 skb = dev_alloc_skb(len + RX_OFFSET);
350 if (!skb) {
351 bp->stats.rx_dropped++;
352 for (frag = first_frag; ; frag = NEXT_RX(frag)) {
353 bp->rx_ring[frag].addr &= ~MACB_BIT(RX_USED);
354 if (frag == last_frag)
355 break;
356 }
357 wmb();
358 return 1;
359 }
360
361 skb_reserve(skb, RX_OFFSET);
362 skb->dev = bp->dev;
363 skb->ip_summed = CHECKSUM_NONE;
364 skb_put(skb, len);
365
366 for (frag = first_frag; ; frag = NEXT_RX(frag)) {
367 unsigned int frag_len = RX_BUFFER_SIZE;
368
369 if (offset + frag_len > len) {
370 BUG_ON(frag != last_frag);
371 frag_len = len - offset;
372 }
373 memcpy(skb->data + offset,
374 bp->rx_buffers + (RX_BUFFER_SIZE * frag),
375 frag_len);
376 offset += RX_BUFFER_SIZE;
377 bp->rx_ring[frag].addr &= ~MACB_BIT(RX_USED);
378 wmb();
379
380 if (frag == last_frag)
381 break;
382 }
383
384 skb->protocol = eth_type_trans(skb, bp->dev);
385
386 bp->stats.rx_packets++;
387 bp->stats.rx_bytes += len;
388 bp->dev->last_rx = jiffies;
389 dev_dbg(&bp->pdev->dev, "received skb of length %u, csum: %08x\n",
390 skb->len, skb->csum);
391 netif_receive_skb(skb);
392
393 return 0;
394 }
395
396 /* Mark DMA descriptors from begin up to and not including end as unused */
397 static void discard_partial_frame(struct macb *bp, unsigned int begin,
398 unsigned int end)
399 {
400 unsigned int frag;
401
402 for (frag = begin; frag != end; frag = NEXT_RX(frag))
403 bp->rx_ring[frag].addr &= ~MACB_BIT(RX_USED);
404 wmb();
405
406 /*
407 * When this happens, the hardware stats registers for
408 * whatever caused this is updated, so we don't have to record
409 * anything.
410 */
411 }
412
413 static int macb_rx(struct macb *bp, int budget)
414 {
415 int received = 0;
416 unsigned int tail = bp->rx_tail;
417 int first_frag = -1;
418
419 for (; budget > 0; tail = NEXT_RX(tail)) {
420 u32 addr, ctrl;
421
422 rmb();
423 addr = bp->rx_ring[tail].addr;
424 ctrl = bp->rx_ring[tail].ctrl;
425
426 if (!(addr & MACB_BIT(RX_USED)))
427 break;
428
429 if (ctrl & MACB_BIT(RX_SOF)) {
430 if (first_frag != -1)
431 discard_partial_frame(bp, first_frag, tail);
432 first_frag = tail;
433 }
434
435 if (ctrl & MACB_BIT(RX_EOF)) {
436 int dropped;
437 BUG_ON(first_frag == -1);
438
439 dropped = macb_rx_frame(bp, first_frag, tail);
440 first_frag = -1;
441 if (!dropped) {
442 received++;
443 budget--;
444 }
445 }
446 }
447
448 if (first_frag != -1)
449 bp->rx_tail = first_frag;
450 else
451 bp->rx_tail = tail;
452
453 return received;
454 }
455
456 static int macb_poll(struct net_device *dev, int *budget)
457 {
458 struct macb *bp = netdev_priv(dev);
459 int orig_budget, work_done, retval = 0;
460 u32 status;
461
462 status = macb_readl(bp, RSR);
463 macb_writel(bp, RSR, status);
464
465 if (!status) {
466 /*
467 * This may happen if an interrupt was pending before
468 * this function was called last time, and no packets
469 * have been received since.
470 */
471 netif_rx_complete(dev);
472 goto out;
473 }
474
475 dev_dbg(&bp->pdev->dev, "poll: status = %08lx, budget = %d\n",
476 (unsigned long)status, *budget);
477
478 if (!(status & MACB_BIT(REC))) {
479 dev_warn(&bp->pdev->dev,
480 "No RX buffers complete, status = %02lx\n",
481 (unsigned long)status);
482 netif_rx_complete(dev);
483 goto out;
484 }
485
486 orig_budget = *budget;
487 if (orig_budget > dev->quota)
488 orig_budget = dev->quota;
489
490 work_done = macb_rx(bp, orig_budget);
491 if (work_done < orig_budget) {
492 netif_rx_complete(dev);
493 retval = 0;
494 } else {
495 retval = 1;
496 }
497
498 /*
499 * We've done what we can to clean the buffers. Make sure we
500 * get notified when new packets arrive.
501 */
502 out:
503 macb_writel(bp, IER, MACB_RX_INT_FLAGS);
504
505 /* TODO: Handle errors */
506
507 return retval;
508 }
509
510 static irqreturn_t macb_interrupt(int irq, void *dev_id)
511 {
512 struct net_device *dev = dev_id;
513 struct macb *bp = netdev_priv(dev);
514 u32 status;
515
516 status = macb_readl(bp, ISR);
517
518 if (unlikely(!status))
519 return IRQ_NONE;
520
521 spin_lock(&bp->lock);
522
523 while (status) {
524 if (status & MACB_BIT(MFD))
525 complete(&bp->mdio_complete);
526
527 /* close possible race with dev_close */
528 if (unlikely(!netif_running(dev))) {
529 macb_writel(bp, IDR, ~0UL);
530 break;
531 }
532
533 if (status & MACB_RX_INT_FLAGS) {
534 if (netif_rx_schedule_prep(dev)) {
535 /*
536 * There's no point taking any more interrupts
537 * until we have processed the buffers
538 */
539 macb_writel(bp, IDR, MACB_RX_INT_FLAGS);
540 dev_dbg(&bp->pdev->dev, "scheduling RX softirq\n");
541 __netif_rx_schedule(dev);
542 }
543 }
544
545 if (status & (MACB_BIT(TCOMP) | MACB_BIT(ISR_TUND)))
546 macb_tx(bp);
547
548 /*
549 * Link change detection isn't possible with RMII, so we'll
550 * add that if/when we get our hands on a full-blown MII PHY.
551 */
552
553 if (status & MACB_BIT(HRESP)) {
554 /*
555 * TODO: Reset the hardware, and maybe move the printk
556 * to a lower-priority context as well (work queue?)
557 */
558 printk(KERN_ERR "%s: DMA bus error: HRESP not OK\n",
559 dev->name);
560 }
561
562 status = macb_readl(bp, ISR);
563 }
564
565 spin_unlock(&bp->lock);
566
567 return IRQ_HANDLED;
568 }
569
570 static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
571 {
572 struct macb *bp = netdev_priv(dev);
573 dma_addr_t mapping;
574 unsigned int len, entry;
575 u32 ctrl;
576
577 #ifdef DEBUG
578 int i;
579 dev_dbg(&bp->pdev->dev,
580 "start_xmit: len %u head %p data %p tail %p end %p\n",
581 skb->len, skb->head, skb->data, skb->tail, skb->end);
582 dev_dbg(&bp->pdev->dev,
583 "data:");
584 for (i = 0; i < 16; i++)
585 printk(" %02x", (unsigned int)skb->data[i]);
586 printk("\n");
587 #endif
588
589 len = skb->len;
590 spin_lock_irq(&bp->lock);
591
592 /* This is a hard error, log it. */
593 if (TX_BUFFS_AVAIL(bp) < 1) {
594 netif_stop_queue(dev);
595 spin_unlock_irq(&bp->lock);
596 dev_err(&bp->pdev->dev,
597 "BUG! Tx Ring full when queue awake!\n");
598 dev_dbg(&bp->pdev->dev, "tx_head = %u, tx_tail = %u\n",
599 bp->tx_head, bp->tx_tail);
600 return 1;
601 }
602
603 entry = bp->tx_head;
604 dev_dbg(&bp->pdev->dev, "Allocated ring entry %u\n", entry);
605 mapping = dma_map_single(&bp->pdev->dev, skb->data,
606 len, DMA_TO_DEVICE);
607 bp->tx_skb[entry].skb = skb;
608 bp->tx_skb[entry].mapping = mapping;
609 dev_dbg(&bp->pdev->dev, "Mapped skb data %p to DMA addr %08lx\n",
610 skb->data, (unsigned long)mapping);
611
612 ctrl = MACB_BF(TX_FRMLEN, len);
613 ctrl |= MACB_BIT(TX_LAST);
614 if (entry == (TX_RING_SIZE - 1))
615 ctrl |= MACB_BIT(TX_WRAP);
616
617 bp->tx_ring[entry].addr = mapping;
618 bp->tx_ring[entry].ctrl = ctrl;
619 wmb();
620
621 entry = NEXT_TX(entry);
622 bp->tx_head = entry;
623
624 macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
625
626 if (TX_BUFFS_AVAIL(bp) < 1)
627 netif_stop_queue(dev);
628
629 spin_unlock_irq(&bp->lock);
630
631 dev->trans_start = jiffies;
632
633 return 0;
634 }
635
636 static void macb_free_consistent(struct macb *bp)
637 {
638 if (bp->tx_skb) {
639 kfree(bp->tx_skb);
640 bp->tx_skb = NULL;
641 }
642 if (bp->rx_ring) {
643 dma_free_coherent(&bp->pdev->dev, RX_RING_BYTES,
644 bp->rx_ring, bp->rx_ring_dma);
645 bp->rx_ring = NULL;
646 }
647 if (bp->tx_ring) {
648 dma_free_coherent(&bp->pdev->dev, TX_RING_BYTES,
649 bp->tx_ring, bp->tx_ring_dma);
650 bp->tx_ring = NULL;
651 }
652 if (bp->rx_buffers) {
653 dma_free_coherent(&bp->pdev->dev,
654 RX_RING_SIZE * RX_BUFFER_SIZE,
655 bp->rx_buffers, bp->rx_buffers_dma);
656 bp->rx_buffers = NULL;
657 }
658 }
659
660 static int macb_alloc_consistent(struct macb *bp)
661 {
662 int size;
663
664 size = TX_RING_SIZE * sizeof(struct ring_info);
665 bp->tx_skb = kmalloc(size, GFP_KERNEL);
666 if (!bp->tx_skb)
667 goto out_err;
668
669 size = RX_RING_BYTES;
670 bp->rx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
671 &bp->rx_ring_dma, GFP_KERNEL);
672 if (!bp->rx_ring)
673 goto out_err;
674 dev_dbg(&bp->pdev->dev,
675 "Allocated RX ring of %d bytes at %08lx (mapped %p)\n",
676 size, (unsigned long)bp->rx_ring_dma, bp->rx_ring);
677
678 size = TX_RING_BYTES;
679 bp->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
680 &bp->tx_ring_dma, GFP_KERNEL);
681 if (!bp->tx_ring)
682 goto out_err;
683 dev_dbg(&bp->pdev->dev,
684 "Allocated TX ring of %d bytes at %08lx (mapped %p)\n",
685 size, (unsigned long)bp->tx_ring_dma, bp->tx_ring);
686
687 size = RX_RING_SIZE * RX_BUFFER_SIZE;
688 bp->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size,
689 &bp->rx_buffers_dma, GFP_KERNEL);
690 if (!bp->rx_buffers)
691 goto out_err;
692 dev_dbg(&bp->pdev->dev,
693 "Allocated RX buffers of %d bytes at %08lx (mapped %p)\n",
694 size, (unsigned long)bp->rx_buffers_dma, bp->rx_buffers);
695
696 return 0;
697
698 out_err:
699 macb_free_consistent(bp);
700 return -ENOMEM;
701 }
702
703 static void macb_init_rings(struct macb *bp)
704 {
705 int i;
706 dma_addr_t addr;
707
708 addr = bp->rx_buffers_dma;
709 for (i = 0; i < RX_RING_SIZE; i++) {
710 bp->rx_ring[i].addr = addr;
711 bp->rx_ring[i].ctrl = 0;
712 addr += RX_BUFFER_SIZE;
713 }
714 bp->rx_ring[RX_RING_SIZE - 1].addr |= MACB_BIT(RX_WRAP);
715
716 for (i = 0; i < TX_RING_SIZE; i++) {
717 bp->tx_ring[i].addr = 0;
718 bp->tx_ring[i].ctrl = MACB_BIT(TX_USED);
719 }
720 bp->tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP);
721
722 bp->rx_tail = bp->tx_head = bp->tx_tail = 0;
723 }
724
725 static void macb_reset_hw(struct macb *bp)
726 {
727 /* Make sure we have the write buffer for ourselves */
728 wmb();
729
730 /*
731 * Disable RX and TX (XXX: Should we halt the transmission
732 * more gracefully?)
733 */
734 macb_writel(bp, NCR, 0);
735
736 /* Clear the stats registers (XXX: Update stats first?) */
737 macb_writel(bp, NCR, MACB_BIT(CLRSTAT));
738
739 /* Clear all status flags */
740 macb_writel(bp, TSR, ~0UL);
741 macb_writel(bp, RSR, ~0UL);
742
743 /* Disable all interrupts */
744 macb_writel(bp, IDR, ~0UL);
745 macb_readl(bp, ISR);
746 }
747
748 static void macb_init_hw(struct macb *bp)
749 {
750 u32 config;
751
752 macb_reset_hw(bp);
753 __macb_set_hwaddr(bp);
754
755 config = macb_readl(bp, NCFGR) & MACB_BF(CLK, -1L);
756 config |= MACB_BIT(PAE); /* PAuse Enable */
757 config |= MACB_BIT(DRFCS); /* Discard Rx FCS */
758 if (bp->dev->flags & IFF_PROMISC)
759 config |= MACB_BIT(CAF); /* Copy All Frames */
760 if (!(bp->dev->flags & IFF_BROADCAST))
761 config |= MACB_BIT(NBC); /* No BroadCast */
762 macb_writel(bp, NCFGR, config);
763
764 /* Initialize TX and RX buffers */
765 macb_writel(bp, RBQP, bp->rx_ring_dma);
766 macb_writel(bp, TBQP, bp->tx_ring_dma);
767
768 /* Enable TX and RX */
769 macb_writel(bp, NCR, MACB_BIT(RE) | MACB_BIT(TE));
770
771 /* Enable interrupts */
772 macb_writel(bp, IER, (MACB_BIT(RCOMP)
773 | MACB_BIT(RXUBR)
774 | MACB_BIT(ISR_TUND)
775 | MACB_BIT(ISR_RLE)
776 | MACB_BIT(TXERR)
777 | MACB_BIT(TCOMP)
778 | MACB_BIT(ISR_ROVR)
779 | MACB_BIT(HRESP)));
780 }
781
782 static void macb_init_phy(struct net_device *dev)
783 {
784 struct macb *bp = netdev_priv(dev);
785
786 /* Set some reasonable default settings */
787 macb_mdio_write(dev, bp->mii.phy_id, MII_ADVERTISE,
788 ADVERTISE_CSMA | ADVERTISE_ALL);
789 macb_mdio_write(dev, bp->mii.phy_id, MII_BMCR,
790 (BMCR_SPEED100 | BMCR_ANENABLE
791 | BMCR_ANRESTART | BMCR_FULLDPLX));
792 }
793
794 static int macb_open(struct net_device *dev)
795 {
796 struct macb *bp = netdev_priv(dev);
797 int err;
798
799 dev_dbg(&bp->pdev->dev, "open\n");
800
801 if (!is_valid_ether_addr(dev->dev_addr))
802 return -EADDRNOTAVAIL;
803
804 err = macb_alloc_consistent(bp);
805 if (err) {
806 printk(KERN_ERR
807 "%s: Unable to allocate DMA memory (error %d)\n",
808 dev->name, err);
809 return err;
810 }
811
812 macb_init_rings(bp);
813 macb_init_hw(bp);
814 macb_init_phy(dev);
815
816 macb_check_media(bp, 1, 1);
817 netif_start_queue(dev);
818
819 schedule_delayed_work(&bp->periodic_task, HZ);
820
821 return 0;
822 }
823
824 static int macb_close(struct net_device *dev)
825 {
826 struct macb *bp = netdev_priv(dev);
827 unsigned long flags;
828
829 cancel_rearming_delayed_work(&bp->periodic_task);
830
831 netif_stop_queue(dev);
832
833 spin_lock_irqsave(&bp->lock, flags);
834 macb_reset_hw(bp);
835 netif_carrier_off(dev);
836 spin_unlock_irqrestore(&bp->lock, flags);
837
838 macb_free_consistent(bp);
839
840 return 0;
841 }
842
843 static struct net_device_stats *macb_get_stats(struct net_device *dev)
844 {
845 struct macb *bp = netdev_priv(dev);
846 struct net_device_stats *nstat = &bp->stats;
847 struct macb_stats *hwstat = &bp->hw_stats;
848
849 /* Convert HW stats into netdevice stats */
850 nstat->rx_errors = (hwstat->rx_fcs_errors +
851 hwstat->rx_align_errors +
852 hwstat->rx_resource_errors +
853 hwstat->rx_overruns +
854 hwstat->rx_oversize_pkts +
855 hwstat->rx_jabbers +
856 hwstat->rx_undersize_pkts +
857 hwstat->sqe_test_errors +
858 hwstat->rx_length_mismatch);
859 nstat->tx_errors = (hwstat->tx_late_cols +
860 hwstat->tx_excessive_cols +
861 hwstat->tx_underruns +
862 hwstat->tx_carrier_errors);
863 nstat->collisions = (hwstat->tx_single_cols +
864 hwstat->tx_multiple_cols +
865 hwstat->tx_excessive_cols);
866 nstat->rx_length_errors = (hwstat->rx_oversize_pkts +
867 hwstat->rx_jabbers +
868 hwstat->rx_undersize_pkts +
869 hwstat->rx_length_mismatch);
870 nstat->rx_over_errors = hwstat->rx_resource_errors;
871 nstat->rx_crc_errors = hwstat->rx_fcs_errors;
872 nstat->rx_frame_errors = hwstat->rx_align_errors;
873 nstat->rx_fifo_errors = hwstat->rx_overruns;
874 /* XXX: What does "missed" mean? */
875 nstat->tx_aborted_errors = hwstat->tx_excessive_cols;
876 nstat->tx_carrier_errors = hwstat->tx_carrier_errors;
877 nstat->tx_fifo_errors = hwstat->tx_underruns;
878 /* Don't know about heartbeat or window errors... */
879
880 return nstat;
881 }
882
883 static int macb_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
884 {
885 struct macb *bp = netdev_priv(dev);
886 int ret;
887 unsigned long flags;
888
889 spin_lock_irqsave(&bp->lock, flags);
890 ret = mii_ethtool_gset(&bp->mii, cmd);
891 spin_unlock_irqrestore(&bp->lock, flags);
892
893 return ret;
894 }
895
896 static int macb_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
897 {
898 struct macb *bp = netdev_priv(dev);
899 int ret;
900 unsigned long flags;
901
902 spin_lock_irqsave(&bp->lock, flags);
903 ret = mii_ethtool_sset(&bp->mii, cmd);
904 spin_unlock_irqrestore(&bp->lock, flags);
905
906 return ret;
907 }
908
909 static void macb_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
910 {
911 struct macb *bp = netdev_priv(dev);
912
913 strcpy(info->driver, bp->pdev->dev.driver->name);
914 strcpy(info->version, "$Revision: 1.14 $");
915 strcpy(info->bus_info, bp->pdev->dev.bus_id);
916 }
917
918 static int macb_nway_reset(struct net_device *dev)
919 {
920 struct macb *bp = netdev_priv(dev);
921 return mii_nway_restart(&bp->mii);
922 }
923
924 static struct ethtool_ops macb_ethtool_ops = {
925 .get_settings = macb_get_settings,
926 .set_settings = macb_set_settings,
927 .get_drvinfo = macb_get_drvinfo,
928 .nway_reset = macb_nway_reset,
929 .get_link = ethtool_op_get_link,
930 };
931
932 static int macb_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
933 {
934 struct macb *bp = netdev_priv(dev);
935 int ret;
936 unsigned long flags;
937
938 if (!netif_running(dev))
939 return -EINVAL;
940
941 spin_lock_irqsave(&bp->lock, flags);
942 ret = generic_mii_ioctl(&bp->mii, if_mii(rq), cmd, NULL);
943 spin_unlock_irqrestore(&bp->lock, flags);
944
945 return ret;
946 }
947
948 static ssize_t macb_mii_show(const struct class_device *cd, char *buf,
949 unsigned long addr)
950 {
951 struct net_device *dev = to_net_dev(cd);
952 struct macb *bp = netdev_priv(dev);
953 ssize_t ret = -EINVAL;
954
955 if (netif_running(dev)) {
956 int value;
957 value = macb_mdio_read(dev, bp->mii.phy_id, addr);
958 ret = sprintf(buf, "0x%04x\n", (uint16_t)value);
959 }
960
961 return ret;
962 }
963
964 #define MII_ENTRY(name, addr) \
965 static ssize_t show_##name(struct class_device *cd, char *buf) \
966 { \
967 return macb_mii_show(cd, buf, addr); \
968 } \
969 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
970
971 MII_ENTRY(bmcr, MII_BMCR);
972 MII_ENTRY(bmsr, MII_BMSR);
973 MII_ENTRY(physid1, MII_PHYSID1);
974 MII_ENTRY(physid2, MII_PHYSID2);
975 MII_ENTRY(advertise, MII_ADVERTISE);
976 MII_ENTRY(lpa, MII_LPA);
977 MII_ENTRY(expansion, MII_EXPANSION);
978
979 static struct attribute *macb_mii_attrs[] = {
980 &class_device_attr_bmcr.attr,
981 &class_device_attr_bmsr.attr,
982 &class_device_attr_physid1.attr,
983 &class_device_attr_physid2.attr,
984 &class_device_attr_advertise.attr,
985 &class_device_attr_lpa.attr,
986 &class_device_attr_expansion.attr,
987 NULL,
988 };
989
990 static struct attribute_group macb_mii_group = {
991 .name = "mii",
992 .attrs = macb_mii_attrs,
993 };
994
995 static void macb_unregister_sysfs(struct net_device *net)
996 {
997 struct class_device *class_dev = &net->class_dev;
998
999 sysfs_remove_group(&class_dev->kobj, &macb_mii_group);
1000 }
1001
1002 static int macb_register_sysfs(struct net_device *net)
1003 {
1004 struct class_device *class_dev = &net->class_dev;
1005 int ret;
1006
1007 ret = sysfs_create_group(&class_dev->kobj, &macb_mii_group);
1008 if (ret)
1009 printk(KERN_WARNING
1010 "%s: sysfs mii attribute registration failed: %d\n",
1011 net->name, ret);
1012 return ret;
1013 }
1014 static int __devinit macb_probe(struct platform_device *pdev)
1015 {
1016 struct eth_platform_data *pdata;
1017 struct resource *regs;
1018 struct net_device *dev;
1019 struct macb *bp;
1020 unsigned long pclk_hz;
1021 u32 config;
1022 int err = -ENXIO;
1023
1024 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1025 if (!regs) {
1026 dev_err(&pdev->dev, "no mmio resource defined\n");
1027 goto err_out;
1028 }
1029
1030 err = -ENOMEM;
1031 dev = alloc_etherdev(sizeof(*bp));
1032 if (!dev) {
1033 dev_err(&pdev->dev, "etherdev alloc failed, aborting.\n");
1034 goto err_out;
1035 }
1036
1037 SET_MODULE_OWNER(dev);
1038 SET_NETDEV_DEV(dev, &pdev->dev);
1039
1040 /* TODO: Actually, we have some interesting features... */
1041 dev->features |= 0;
1042
1043 bp = netdev_priv(dev);
1044 bp->pdev = pdev;
1045 bp->dev = dev;
1046
1047 spin_lock_init(&bp->lock);
1048
1049 bp->pclk = clk_get(&pdev->dev, "pclk");
1050 if (IS_ERR(bp->pclk)) {
1051 dev_err(&pdev->dev, "failed to get pclk\n");
1052 goto err_out_free_dev;
1053 }
1054 bp->hclk = clk_get(&pdev->dev, "hclk");
1055 if (IS_ERR(bp->hclk)) {
1056 dev_err(&pdev->dev, "failed to get hclk\n");
1057 goto err_out_put_pclk;
1058 }
1059
1060 clk_enable(bp->pclk);
1061 clk_enable(bp->hclk);
1062
1063 bp->regs = ioremap(regs->start, regs->end - regs->start + 1);
1064 if (!bp->regs) {
1065 dev_err(&pdev->dev, "failed to map registers, aborting.\n");
1066 err = -ENOMEM;
1067 goto err_out_disable_clocks;
1068 }
1069
1070 dev->irq = platform_get_irq(pdev, 0);
1071 err = request_irq(dev->irq, macb_interrupt, SA_SAMPLE_RANDOM,
1072 dev->name, dev);
1073 if (err) {
1074 printk(KERN_ERR
1075 "%s: Unable to request IRQ %d (error %d)\n",
1076 dev->name, dev->irq, err);
1077 goto err_out_iounmap;
1078 }
1079
1080 dev->open = macb_open;
1081 dev->stop = macb_close;
1082 dev->hard_start_xmit = macb_start_xmit;
1083 dev->get_stats = macb_get_stats;
1084 dev->do_ioctl = macb_ioctl;
1085 dev->poll = macb_poll;
1086 dev->weight = 64;
1087 dev->ethtool_ops = &macb_ethtool_ops;
1088
1089 dev->base_addr = regs->start;
1090
1091 INIT_DELAYED_WORK(&bp->periodic_task, macb_periodic_task);
1092 mutex_init(&bp->mdio_mutex);
1093 init_completion(&bp->mdio_complete);
1094
1095 /* Set MII management clock divider */
1096 pclk_hz = clk_get_rate(bp->pclk);
1097 if (pclk_hz <= 20000000)
1098 config = MACB_BF(CLK, MACB_CLK_DIV8);
1099 else if (pclk_hz <= 40000000)
1100 config = MACB_BF(CLK, MACB_CLK_DIV16);
1101 else if (pclk_hz <= 80000000)
1102 config = MACB_BF(CLK, MACB_CLK_DIV32);
1103 else
1104 config = MACB_BF(CLK, MACB_CLK_DIV64);
1105 macb_writel(bp, NCFGR, config);
1106
1107 bp->mii.dev = dev;
1108 bp->mii.mdio_read = macb_mdio_read;
1109 bp->mii.mdio_write = macb_mdio_write;
1110 bp->mii.phy_id_mask = 0x1f;
1111 bp->mii.reg_num_mask = 0x1f;
1112
1113 macb_get_hwaddr(bp);
1114 err = macb_phy_probe(bp);
1115 if (err) {
1116 dev_err(&pdev->dev, "Failed to detect PHY, aborting.\n");
1117 goto err_out_free_irq;
1118 }
1119
1120 pdata = pdev->dev.platform_data;
1121 if (pdata && pdata->is_rmii)
1122 macb_writel(bp, USRIO, 0);
1123 else
1124 macb_writel(bp, USRIO, MACB_BIT(MII));
1125
1126 bp->tx_pending = DEF_TX_RING_PENDING;
1127
1128 err = register_netdev(dev);
1129 if (err) {
1130 dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
1131 goto err_out_free_irq;
1132 }
1133
1134 platform_set_drvdata(pdev, dev);
1135
1136 macb_register_sysfs(dev);
1137
1138 printk(KERN_INFO "%s: Atmel MACB at 0x%08lx irq %d "
1139 "(%02x:%02x:%02x:%02x:%02x:%02x)\n",
1140 dev->name, dev->base_addr, dev->irq,
1141 dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
1142 dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
1143
1144 return 0;
1145
1146 err_out_free_irq:
1147 free_irq(dev->irq, dev);
1148 err_out_iounmap:
1149 iounmap(bp->regs);
1150 err_out_disable_clocks:
1151 clk_disable(bp->hclk);
1152 clk_disable(bp->pclk);
1153 clk_put(bp->hclk);
1154 err_out_put_pclk:
1155 clk_put(bp->pclk);
1156 err_out_free_dev:
1157 free_netdev(dev);
1158 err_out:
1159 platform_set_drvdata(pdev, NULL);
1160 return err;
1161 }
1162
1163 static int __devexit macb_remove(struct platform_device *pdev)
1164 {
1165 struct net_device *dev;
1166 struct macb *bp;
1167
1168 dev = platform_get_drvdata(pdev);
1169
1170 if (dev) {
1171 bp = netdev_priv(dev);
1172 macb_unregister_sysfs(dev);
1173 unregister_netdev(dev);
1174 free_irq(dev->irq, dev);
1175 iounmap(bp->regs);
1176 clk_disable(bp->hclk);
1177 clk_disable(bp->pclk);
1178 clk_put(bp->hclk);
1179 clk_put(bp->pclk);
1180 free_netdev(dev);
1181 platform_set_drvdata(pdev, NULL);
1182 }
1183
1184 return 0;
1185 }
1186
1187 static struct platform_driver macb_driver = {
1188 .probe = macb_probe,
1189 .remove = __devexit_p(macb_remove),
1190 .driver = {
1191 .name = "macb",
1192 },
1193 };
1194
1195 static int __init macb_init(void)
1196 {
1197 return platform_driver_register(&macb_driver);
1198 }
1199
1200 static void __exit macb_exit(void)
1201 {
1202 platform_driver_unregister(&macb_driver);
1203 }
1204
1205 module_init(macb_init);
1206 module_exit(macb_exit);
1207
1208 MODULE_LICENSE("GPL");
1209 MODULE_DESCRIPTION("Atmel MACB Ethernet driver");
1210 MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
Linux with added FPC-III support