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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / net / macb.c
blob489c7c3b90d9090994e87e2a401246e9caacfa25
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/dma-mapping.h>
21 #include <linux/platform_device.h>
22 #include <linux/phy.h>
23
24 #include <asm/arch/board.h>
25 #include <asm/arch/cpu.h>
26
27 #include "macb.h"
28
29 #define RX_BUFFER_SIZE 128
30 #define RX_RING_SIZE 512
31 #define RX_RING_BYTES (sizeof(struct dma_desc) * RX_RING_SIZE)
32
33 /* Make the IP header word-aligned (the ethernet header is 14 bytes) */
34 #define RX_OFFSET 2
35
36 #define TX_RING_SIZE 128
37 #define DEF_TX_RING_PENDING (TX_RING_SIZE - 1)
38 #define TX_RING_BYTES (sizeof(struct dma_desc) * TX_RING_SIZE)
39
40 #define TX_RING_GAP(bp) \
41 (TX_RING_SIZE - (bp)->tx_pending)
42 #define TX_BUFFS_AVAIL(bp) \
43 (((bp)->tx_tail <= (bp)->tx_head) ? \
44 (bp)->tx_tail + (bp)->tx_pending - (bp)->tx_head : \
45 (bp)->tx_tail - (bp)->tx_head - TX_RING_GAP(bp))
46 #define NEXT_TX(n) (((n) + 1) & (TX_RING_SIZE - 1))
47
48 #define NEXT_RX(n) (((n) + 1) & (RX_RING_SIZE - 1))
49
50 /* minimum number of free TX descriptors before waking up TX process */
51 #define MACB_TX_WAKEUP_THRESH (TX_RING_SIZE / 4)
52
53 #define MACB_RX_INT_FLAGS (MACB_BIT(RCOMP) | MACB_BIT(RXUBR) \
54 | MACB_BIT(ISR_ROVR))
55
56 static void __macb_set_hwaddr(struct macb *bp)
57 {
58 u32 bottom;
59 u16 top;
60
61 bottom = cpu_to_le32(*((u32 *)bp->dev->dev_addr));
62 macb_writel(bp, SA1B, bottom);
63 top = cpu_to_le16(*((u16 *)(bp->dev->dev_addr + 4)));
64 macb_writel(bp, SA1T, top);
65 }
66
67 static void __init macb_get_hwaddr(struct macb *bp)
68 {
69 u32 bottom;
70 u16 top;
71 u8 addr[6];
72
73 bottom = macb_readl(bp, SA1B);
74 top = macb_readl(bp, SA1T);
75
76 addr[0] = bottom & 0xff;
77 addr[1] = (bottom >> 8) & 0xff;
78 addr[2] = (bottom >> 16) & 0xff;
79 addr[3] = (bottom >> 24) & 0xff;
80 addr[4] = top & 0xff;
81 addr[5] = (top >> 8) & 0xff;
82
83 if (is_valid_ether_addr(addr))
84 memcpy(bp->dev->dev_addr, addr, sizeof(addr));
85 }
86
87 static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
88 {
89 struct macb *bp = bus->priv;
90 int value;
91
92 macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
93 | MACB_BF(RW, MACB_MAN_READ)
94 | MACB_BF(PHYA, mii_id)
95 | MACB_BF(REGA, regnum)
96 | MACB_BF(CODE, MACB_MAN_CODE)));
97
98 /* wait for end of transfer */
99 while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
100 cpu_relax();
101
102 value = MACB_BFEXT(DATA, macb_readl(bp, MAN));
103
104 return value;
105 }
106
107 static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
108 u16 value)
109 {
110 struct macb *bp = bus->priv;
111
112 macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
113 | MACB_BF(RW, MACB_MAN_WRITE)
114 | MACB_BF(PHYA, mii_id)
115 | MACB_BF(REGA, regnum)
116 | MACB_BF(CODE, MACB_MAN_CODE)
117 | MACB_BF(DATA, value)));
118
119 /* wait for end of transfer */
120 while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
121 cpu_relax();
122
123 return 0;
124 }
125
126 static int macb_mdio_reset(struct mii_bus *bus)
127 {
128 return 0;
129 }
130
131 static void macb_handle_link_change(struct net_device *dev)
132 {
133 struct macb *bp = netdev_priv(dev);
134 struct phy_device *phydev = bp->phy_dev;
135 unsigned long flags;
136
137 int status_change = 0;
138
139 spin_lock_irqsave(&bp->lock, flags);
140
141 if (phydev->link) {
142 if ((bp->speed != phydev->speed) ||
143 (bp->duplex != phydev->duplex)) {
144 u32 reg;
145
146 reg = macb_readl(bp, NCFGR);
147 reg &= ~(MACB_BIT(SPD) | MACB_BIT(FD));
148
149 if (phydev->duplex)
150 reg |= MACB_BIT(FD);
151 if (phydev->speed == SPEED_100)
152 reg |= MACB_BIT(SPD);
153
154 macb_writel(bp, NCFGR, reg);
155
156 bp->speed = phydev->speed;
157 bp->duplex = phydev->duplex;
158 status_change = 1;
159 }
160 }
161
162 if (phydev->link != bp->link) {
163 if (phydev->link)
164 netif_schedule(dev);
165 else {
166 bp->speed = 0;
167 bp->duplex = -1;
168 }
169 bp->link = phydev->link;
170
171 status_change = 1;
172 }
173
174 spin_unlock_irqrestore(&bp->lock, flags);
175
176 if (status_change) {
177 if (phydev->link)
178 printk(KERN_INFO "%s: link up (%d/%s)\n",
179 dev->name, phydev->speed,
180 DUPLEX_FULL == phydev->duplex ? "Full":"Half");
181 else
182 printk(KERN_INFO "%s: link down\n", dev->name);
183 }
184 }
185
186 /* based on au1000_eth. c*/
187 static int macb_mii_probe(struct net_device *dev)
188 {
189 struct macb *bp = netdev_priv(dev);
190 struct phy_device *phydev = NULL;
191 struct eth_platform_data *pdata;
192 int phy_addr;
193
194 /* find the first phy */
195 for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
196 if (bp->mii_bus.phy_map[phy_addr]) {
197 phydev = bp->mii_bus.phy_map[phy_addr];
198 break;
199 }
200 }
201
202 if (!phydev) {
203 printk (KERN_ERR "%s: no PHY found\n", dev->name);
204 return -1;
205 }
206
207 pdata = bp->pdev->dev.platform_data;
208 /* TODO : add pin_irq */
209
210 /* attach the mac to the phy */
211 if (pdata && pdata->is_rmii) {
212 phydev = phy_connect(dev, phydev->dev.bus_id,
213 &macb_handle_link_change, 0, PHY_INTERFACE_MODE_RMII);
214 } else {
215 phydev = phy_connect(dev, phydev->dev.bus_id,
216 &macb_handle_link_change, 0, PHY_INTERFACE_MODE_MII);
217 }
218
219 if (IS_ERR(phydev)) {
220 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
221 return PTR_ERR(phydev);
222 }
223
224 /* mask with MAC supported features */
225 phydev->supported &= PHY_BASIC_FEATURES;
226
227 phydev->advertising = phydev->supported;
228
229 bp->link = 0;
230 bp->speed = 0;
231 bp->duplex = -1;
232 bp->phy_dev = phydev;
233
234 return 0;
235 }
236
237 static int macb_mii_init(struct macb *bp)
238 {
239 struct eth_platform_data *pdata;
240 int err = -ENXIO, i;
241
242 /* Enable managment port */
243 macb_writel(bp, NCR, MACB_BIT(MPE));
244
245 bp->mii_bus.name = "MACB_mii_bus";
246 bp->mii_bus.read = &macb_mdio_read;
247 bp->mii_bus.write = &macb_mdio_write;
248 bp->mii_bus.reset = &macb_mdio_reset;
249 bp->mii_bus.id = bp->pdev->id;
250 bp->mii_bus.priv = bp;
251 bp->mii_bus.dev = &bp->dev->dev;
252 pdata = bp->pdev->dev.platform_data;
253
254 if (pdata)
255 bp->mii_bus.phy_mask = pdata->phy_mask;
256
257 bp->mii_bus.irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
258 if (!bp->mii_bus.irq) {
259 err = -ENOMEM;
260 goto err_out;
261 }
262
263 for (i = 0; i < PHY_MAX_ADDR; i++)
264 bp->mii_bus.irq[i] = PHY_POLL;
265
266 platform_set_drvdata(bp->dev, &bp->mii_bus);
267
268 if (mdiobus_register(&bp->mii_bus))
269 goto err_out_free_mdio_irq;
270
271 if (macb_mii_probe(bp->dev) != 0) {
272 goto err_out_unregister_bus;
273 }
274
275 return 0;
276
277 err_out_unregister_bus:
278 mdiobus_unregister(&bp->mii_bus);
279 err_out_free_mdio_irq:
280 kfree(bp->mii_bus.irq);
281 err_out:
282 return err;
283 }
284
285 static 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
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 dev_dbg(&bp->pdev->dev, "macb_tx status = %02lx\n",
307 (unsigned long)status);
308
309 if (status & MACB_BIT(UND)) {
310 int i;
311 printk(KERN_ERR "%s: TX underrun, resetting buffers\n",
312 bp->dev->name);
313
314 head = bp->tx_head;
315
316 /*Mark all the buffer as used to avoid sending a lost buffer*/
317 for (i = 0; i < TX_RING_SIZE; i++)
318 bp->tx_ring[i].ctrl = MACB_BIT(TX_USED);
319
320 /* free transmit buffer in upper layer*/
321 for (tail = bp->tx_tail; tail != head; tail = NEXT_TX(tail)) {
322 struct ring_info *rp = &bp->tx_skb[tail];
323 struct sk_buff *skb = rp->skb;
324
325 BUG_ON(skb == NULL);
326
327 rmb();
328
329 dma_unmap_single(&bp->pdev->dev, rp->mapping, skb->len,
330 DMA_TO_DEVICE);
331 rp->skb = NULL;
332 dev_kfree_skb_irq(skb);
333 }
334
335 bp->tx_head = bp->tx_tail = 0;
336 }
337
338 if (!(status & MACB_BIT(COMP)))
339 /*
340 * This may happen when a buffer becomes complete
341 * between reading the ISR and scanning the
342 * descriptors. Nothing to worry about.
343 */
344 return;
345
346 head = bp->tx_head;
347 for (tail = bp->tx_tail; tail != head; tail = NEXT_TX(tail)) {
348 struct ring_info *rp = &bp->tx_skb[tail];
349 struct sk_buff *skb = rp->skb;
350 u32 bufstat;
351
352 BUG_ON(skb == NULL);
353
354 rmb();
355 bufstat = bp->tx_ring[tail].ctrl;
356
357 if (!(bufstat & MACB_BIT(TX_USED)))
358 break;
359
360 dev_dbg(&bp->pdev->dev, "skb %u (data %p) TX complete\n",
361 tail, skb->data);
362 dma_unmap_single(&bp->pdev->dev, rp->mapping, skb->len,
363 DMA_TO_DEVICE);
364 bp->stats.tx_packets++;
365 bp->stats.tx_bytes += skb->len;
366 rp->skb = NULL;
367 dev_kfree_skb_irq(skb);
368 }
369
370 bp->tx_tail = tail;
371 if (netif_queue_stopped(bp->dev) &&
372 TX_BUFFS_AVAIL(bp) > MACB_TX_WAKEUP_THRESH)
373 netif_wake_queue(bp->dev);
374 }
375
376 static int macb_rx_frame(struct macb *bp, unsigned int first_frag,
377 unsigned int last_frag)
378 {
379 unsigned int len;
380 unsigned int frag;
381 unsigned int offset = 0;
382 struct sk_buff *skb;
383
384 len = MACB_BFEXT(RX_FRMLEN, bp->rx_ring[last_frag].ctrl);
385
386 dev_dbg(&bp->pdev->dev, "macb_rx_frame frags %u - %u (len %u)\n",
387 first_frag, last_frag, len);
388
389 skb = dev_alloc_skb(len + RX_OFFSET);
390 if (!skb) {
391 bp->stats.rx_dropped++;
392 for (frag = first_frag; ; frag = NEXT_RX(frag)) {
393 bp->rx_ring[frag].addr &= ~MACB_BIT(RX_USED);
394 if (frag == last_frag)
395 break;
396 }
397 wmb();
398 return 1;
399 }
400
401 skb_reserve(skb, RX_OFFSET);
402 skb->ip_summed = CHECKSUM_NONE;
403 skb_put(skb, len);
404
405 for (frag = first_frag; ; frag = NEXT_RX(frag)) {
406 unsigned int frag_len = RX_BUFFER_SIZE;
407
408 if (offset + frag_len > len) {
409 BUG_ON(frag != last_frag);
410 frag_len = len - offset;
411 }
412 skb_copy_to_linear_data_offset(skb, offset,
413 (bp->rx_buffers +
414 (RX_BUFFER_SIZE * frag)),
415 frag_len);
416 offset += RX_BUFFER_SIZE;
417 bp->rx_ring[frag].addr &= ~MACB_BIT(RX_USED);
418 wmb();
419
420 if (frag == last_frag)
421 break;
422 }
423
424 skb->protocol = eth_type_trans(skb, bp->dev);
425
426 bp->stats.rx_packets++;
427 bp->stats.rx_bytes += len;
428 bp->dev->last_rx = jiffies;
429 dev_dbg(&bp->pdev->dev, "received skb of length %u, csum: %08x\n",
430 skb->len, skb->csum);
431 netif_receive_skb(skb);
432
433 return 0;
434 }
435
436 /* Mark DMA descriptors from begin up to and not including end as unused */
437 static void discard_partial_frame(struct macb *bp, unsigned int begin,
438 unsigned int end)
439 {
440 unsigned int frag;
441
442 for (frag = begin; frag != end; frag = NEXT_RX(frag))
443 bp->rx_ring[frag].addr &= ~MACB_BIT(RX_USED);
444 wmb();
445
446 /*
447 * When this happens, the hardware stats registers for
448 * whatever caused this is updated, so we don't have to record
449 * anything.
450 */
451 }
452
453 static int macb_rx(struct macb *bp, int budget)
454 {
455 int received = 0;
456 unsigned int tail = bp->rx_tail;
457 int first_frag = -1;
458
459 for (; budget > 0; tail = NEXT_RX(tail)) {
460 u32 addr, ctrl;
461
462 rmb();
463 addr = bp->rx_ring[tail].addr;
464 ctrl = bp->rx_ring[tail].ctrl;
465
466 if (!(addr & MACB_BIT(RX_USED)))
467 break;
468
469 if (ctrl & MACB_BIT(RX_SOF)) {
470 if (first_frag != -1)
471 discard_partial_frame(bp, first_frag, tail);
472 first_frag = tail;
473 }
474
475 if (ctrl & MACB_BIT(RX_EOF)) {
476 int dropped;
477 BUG_ON(first_frag == -1);
478
479 dropped = macb_rx_frame(bp, first_frag, tail);
480 first_frag = -1;
481 if (!dropped) {
482 received++;
483 budget--;
484 }
485 }
486 }
487
488 if (first_frag != -1)
489 bp->rx_tail = first_frag;
490 else
491 bp->rx_tail = tail;
492
493 return received;
494 }
495
496 static int macb_poll(struct napi_struct *napi, int budget)
497 {
498 struct macb *bp = container_of(napi, struct macb, napi);
499 struct net_device *dev = bp->dev;
500 int work_done;
501 u32 status;
502
503 status = macb_readl(bp, RSR);
504 macb_writel(bp, RSR, status);
505
506 work_done = 0;
507 if (!status) {
508 /*
509 * This may happen if an interrupt was pending before
510 * this function was called last time, and no packets
511 * have been received since.
512 */
513 netif_rx_complete(dev, napi);
514 goto out;
515 }
516
517 dev_dbg(&bp->pdev->dev, "poll: status = %08lx, budget = %d\n",
518 (unsigned long)status, budget);
519
520 if (!(status & MACB_BIT(REC))) {
521 dev_warn(&bp->pdev->dev,
522 "No RX buffers complete, status = %02lx\n",
523 (unsigned long)status);
524 netif_rx_complete(dev, napi);
525 goto out;
526 }
527
528 work_done = macb_rx(bp, budget);
529 if (work_done < budget)
530 netif_rx_complete(dev, napi);
531
532 /*
533 * We've done what we can to clean the buffers. Make sure we
534 * get notified when new packets arrive.
535 */
536 out:
537 macb_writel(bp, IER, MACB_RX_INT_FLAGS);
538
539 /* TODO: Handle errors */
540
541 return work_done;
542 }
543
544 static irqreturn_t macb_interrupt(int irq, void *dev_id)
545 {
546 struct net_device *dev = dev_id;
547 struct macb *bp = netdev_priv(dev);
548 u32 status;
549
550 status = macb_readl(bp, ISR);
551
552 if (unlikely(!status))
553 return IRQ_NONE;
554
555 spin_lock(&bp->lock);
556
557 while (status) {
558 /* close possible race with dev_close */
559 if (unlikely(!netif_running(dev))) {
560 macb_writel(bp, IDR, ~0UL);
561 break;
562 }
563
564 if (status & MACB_RX_INT_FLAGS) {
565 if (netif_rx_schedule_prep(dev, &bp->napi)) {
566 /*
567 * There's no point taking any more interrupts
568 * until we have processed the buffers
569 */
570 macb_writel(bp, IDR, MACB_RX_INT_FLAGS);
571 dev_dbg(&bp->pdev->dev,
572 "scheduling RX softirq\n");
573 __netif_rx_schedule(dev, &bp->napi);
574 }
575 }
576
577 if (status & (MACB_BIT(TCOMP) | MACB_BIT(ISR_TUND)))
578 macb_tx(bp);
579
580 /*
581 * Link change detection isn't possible with RMII, so we'll
582 * add that if/when we get our hands on a full-blown MII PHY.
583 */
584
585 if (status & MACB_BIT(HRESP)) {
586 /*
587 * TODO: Reset the hardware, and maybe move the printk
588 * to a lower-priority context as well (work queue?)
589 */
590 printk(KERN_ERR "%s: DMA bus error: HRESP not OK\n",
591 dev->name);
592 }
593
594 status = macb_readl(bp, ISR);
595 }
596
597 spin_unlock(&bp->lock);
598
599 return IRQ_HANDLED;
600 }
601
602 static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
603 {
604 struct macb *bp = netdev_priv(dev);
605 dma_addr_t mapping;
606 unsigned int len, entry;
607 u32 ctrl;
608
609 #ifdef DEBUG
610 int i;
611 dev_dbg(&bp->pdev->dev,
612 "start_xmit: len %u head %p data %p tail %p end %p\n",
613 skb->len, skb->head, skb->data,
614 skb_tail_pointer(skb), skb_end_pointer(skb));
615 dev_dbg(&bp->pdev->dev,
616 "data:");
617 for (i = 0; i < 16; i++)
618 printk(" %02x", (unsigned int)skb->data[i]);
619 printk("\n");
620 #endif
621
622 len = skb->len;
623 spin_lock_irq(&bp->lock);
624
625 /* This is a hard error, log it. */
626 if (TX_BUFFS_AVAIL(bp) < 1) {
627 netif_stop_queue(dev);
628 spin_unlock_irq(&bp->lock);
629 dev_err(&bp->pdev->dev,
630 "BUG! Tx Ring full when queue awake!\n");
631 dev_dbg(&bp->pdev->dev, "tx_head = %u, tx_tail = %u\n",
632 bp->tx_head, bp->tx_tail);
633 return 1;
634 }
635
636 entry = bp->tx_head;
637 dev_dbg(&bp->pdev->dev, "Allocated ring entry %u\n", entry);
638 mapping = dma_map_single(&bp->pdev->dev, skb->data,
639 len, DMA_TO_DEVICE);
640 bp->tx_skb[entry].skb = skb;
641 bp->tx_skb[entry].mapping = mapping;
642 dev_dbg(&bp->pdev->dev, "Mapped skb data %p to DMA addr %08lx\n",
643 skb->data, (unsigned long)mapping);
644
645 ctrl = MACB_BF(TX_FRMLEN, len);
646 ctrl |= MACB_BIT(TX_LAST);
647 if (entry == (TX_RING_SIZE - 1))
648 ctrl |= MACB_BIT(TX_WRAP);
649
650 bp->tx_ring[entry].addr = mapping;
651 bp->tx_ring[entry].ctrl = ctrl;
652 wmb();
653
654 entry = NEXT_TX(entry);
655 bp->tx_head = entry;
656
657 macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
658
659 if (TX_BUFFS_AVAIL(bp) < 1)
660 netif_stop_queue(dev);
661
662 spin_unlock_irq(&bp->lock);
663
664 dev->trans_start = jiffies;
665
666 return 0;
667 }
668
669 static void macb_free_consistent(struct macb *bp)
670 {
671 if (bp->tx_skb) {
672 kfree(bp->tx_skb);
673 bp->tx_skb = NULL;
674 }
675 if (bp->rx_ring) {
676 dma_free_coherent(&bp->pdev->dev, RX_RING_BYTES,
677 bp->rx_ring, bp->rx_ring_dma);
678 bp->rx_ring = NULL;
679 }
680 if (bp->tx_ring) {
681 dma_free_coherent(&bp->pdev->dev, TX_RING_BYTES,
682 bp->tx_ring, bp->tx_ring_dma);
683 bp->tx_ring = NULL;
684 }
685 if (bp->rx_buffers) {
686 dma_free_coherent(&bp->pdev->dev,
687 RX_RING_SIZE * RX_BUFFER_SIZE,
688 bp->rx_buffers, bp->rx_buffers_dma);
689 bp->rx_buffers = NULL;
690 }
691 }
692
693 static int macb_alloc_consistent(struct macb *bp)
694 {
695 int size;
696
697 size = TX_RING_SIZE * sizeof(struct ring_info);
698 bp->tx_skb = kmalloc(size, GFP_KERNEL);
699 if (!bp->tx_skb)
700 goto out_err;
701
702 size = RX_RING_BYTES;
703 bp->rx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
704 &bp->rx_ring_dma, GFP_KERNEL);
705 if (!bp->rx_ring)
706 goto out_err;
707 dev_dbg(&bp->pdev->dev,
708 "Allocated RX ring of %d bytes at %08lx (mapped %p)\n",
709 size, (unsigned long)bp->rx_ring_dma, bp->rx_ring);
710
711 size = TX_RING_BYTES;
712 bp->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
713 &bp->tx_ring_dma, GFP_KERNEL);
714 if (!bp->tx_ring)
715 goto out_err;
716 dev_dbg(&bp->pdev->dev,
717 "Allocated TX ring of %d bytes at %08lx (mapped %p)\n",
718 size, (unsigned long)bp->tx_ring_dma, bp->tx_ring);
719
720 size = RX_RING_SIZE * RX_BUFFER_SIZE;
721 bp->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size,
722 &bp->rx_buffers_dma, GFP_KERNEL);
723 if (!bp->rx_buffers)
724 goto out_err;
725 dev_dbg(&bp->pdev->dev,
726 "Allocated RX buffers of %d bytes at %08lx (mapped %p)\n",
727 size, (unsigned long)bp->rx_buffers_dma, bp->rx_buffers);
728
729 return 0;
730
731 out_err:
732 macb_free_consistent(bp);
733 return -ENOMEM;
734 }
735
736 static void macb_init_rings(struct macb *bp)
737 {
738 int i;
739 dma_addr_t addr;
740
741 addr = bp->rx_buffers_dma;
742 for (i = 0; i < RX_RING_SIZE; i++) {
743 bp->rx_ring[i].addr = addr;
744 bp->rx_ring[i].ctrl = 0;
745 addr += RX_BUFFER_SIZE;
746 }
747 bp->rx_ring[RX_RING_SIZE - 1].addr |= MACB_BIT(RX_WRAP);
748
749 for (i = 0; i < TX_RING_SIZE; i++) {
750 bp->tx_ring[i].addr = 0;
751 bp->tx_ring[i].ctrl = MACB_BIT(TX_USED);
752 }
753 bp->tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP);
754
755 bp->rx_tail = bp->tx_head = bp->tx_tail = 0;
756 }
757
758 static void macb_reset_hw(struct macb *bp)
759 {
760 /* Make sure we have the write buffer for ourselves */
761 wmb();
762
763 /*
764 * Disable RX and TX (XXX: Should we halt the transmission
765 * more gracefully?)
766 */
767 macb_writel(bp, NCR, 0);
768
769 /* Clear the stats registers (XXX: Update stats first?) */
770 macb_writel(bp, NCR, MACB_BIT(CLRSTAT));
771
772 /* Clear all status flags */
773 macb_writel(bp, TSR, ~0UL);
774 macb_writel(bp, RSR, ~0UL);
775
776 /* Disable all interrupts */
777 macb_writel(bp, IDR, ~0UL);
778 macb_readl(bp, ISR);
779 }
780
781 static void macb_init_hw(struct macb *bp)
782 {
783 u32 config;
784
785 macb_reset_hw(bp);
786 __macb_set_hwaddr(bp);
787
788 config = macb_readl(bp, NCFGR) & MACB_BF(CLK, -1L);
789 config |= MACB_BIT(PAE); /* PAuse Enable */
790 config |= MACB_BIT(DRFCS); /* Discard Rx FCS */
791 if (bp->dev->flags & IFF_PROMISC)
792 config |= MACB_BIT(CAF); /* Copy All Frames */
793 if (!(bp->dev->flags & IFF_BROADCAST))
794 config |= MACB_BIT(NBC); /* No BroadCast */
795 macb_writel(bp, NCFGR, config);
796
797 /* Initialize TX and RX buffers */
798 macb_writel(bp, RBQP, bp->rx_ring_dma);
799 macb_writel(bp, TBQP, bp->tx_ring_dma);
800
801 /* Enable TX and RX */
802 macb_writel(bp, NCR, MACB_BIT(RE) | MACB_BIT(TE) | MACB_BIT(MPE));
803
804 /* Enable interrupts */
805 macb_writel(bp, IER, (MACB_BIT(RCOMP)
806 | MACB_BIT(RXUBR)
807 | MACB_BIT(ISR_TUND)
808 | MACB_BIT(ISR_RLE)
809 | MACB_BIT(TXERR)
810 | MACB_BIT(TCOMP)
811 | MACB_BIT(ISR_ROVR)
812 | MACB_BIT(HRESP)));
813
814 }
815
816 /*
817 * The hash address register is 64 bits long and takes up two
818 * locations in the memory map. The least significant bits are stored
819 * in EMAC_HSL and the most significant bits in EMAC_HSH.
820 *
821 * The unicast hash enable and the multicast hash enable bits in the
822 * network configuration register enable the reception of hash matched
823 * frames. The destination address is reduced to a 6 bit index into
824 * the 64 bit hash register using the following hash function. The
825 * hash function is an exclusive or of every sixth bit of the
826 * destination address.
827 *
828 * hi[5] = da[5] ^ da[11] ^ da[17] ^ da[23] ^ da[29] ^ da[35] ^ da[41] ^ da[47]
829 * hi[4] = da[4] ^ da[10] ^ da[16] ^ da[22] ^ da[28] ^ da[34] ^ da[40] ^ da[46]
830 * hi[3] = da[3] ^ da[09] ^ da[15] ^ da[21] ^ da[27] ^ da[33] ^ da[39] ^ da[45]
831 * hi[2] = da[2] ^ da[08] ^ da[14] ^ da[20] ^ da[26] ^ da[32] ^ da[38] ^ da[44]
832 * hi[1] = da[1] ^ da[07] ^ da[13] ^ da[19] ^ da[25] ^ da[31] ^ da[37] ^ da[43]
833 * hi[0] = da[0] ^ da[06] ^ da[12] ^ da[18] ^ da[24] ^ da[30] ^ da[36] ^ da[42]
834 *
835 * da[0] represents the least significant bit of the first byte
836 * received, that is, the multicast/unicast indicator, and da[47]
837 * represents the most significant bit of the last byte received. If
838 * the hash index, hi[n], points to a bit that is set in the hash
839 * register then the frame will be matched according to whether the
840 * frame is multicast or unicast. A multicast match will be signalled
841 * if the multicast hash enable bit is set, da[0] is 1 and the hash
842 * index points to a bit set in the hash register. A unicast match
843 * will be signalled if the unicast hash enable bit is set, da[0] is 0
844 * and the hash index points to a bit set in the hash register. To
845 * receive all multicast frames, the hash register should be set with
846 * all ones and the multicast hash enable bit should be set in the
847 * network configuration register.
848 */
849
850 static inline int hash_bit_value(int bitnr, __u8 *addr)
851 {
852 if (addr[bitnr / 8] & (1 << (bitnr % 8)))
853 return 1;
854 return 0;
855 }
856
857 /*
858 * Return the hash index value for the specified address.
859 */
860 static int hash_get_index(__u8 *addr)
861 {
862 int i, j, bitval;
863 int hash_index = 0;
864
865 for (j = 0; j < 6; j++) {
866 for (i = 0, bitval = 0; i < 8; i++)
867 bitval ^= hash_bit_value(i*6 + j, addr);
868
869 hash_index |= (bitval << j);
870 }
871
872 return hash_index;
873 }
874
875 /*
876 * Add multicast addresses to the internal multicast-hash table.
877 */
878 static void macb_sethashtable(struct net_device *dev)
879 {
880 struct dev_mc_list *curr;
881 unsigned long mc_filter[2];
882 unsigned int i, bitnr;
883 struct macb *bp = netdev_priv(dev);
884
885 mc_filter[0] = mc_filter[1] = 0;
886
887 curr = dev->mc_list;
888 for (i = 0; i < dev->mc_count; i++, curr = curr->next) {
889 if (!curr) break; /* unexpected end of list */
890
891 bitnr = hash_get_index(curr->dmi_addr);
892 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
893 }
894
895 macb_writel(bp, HRB, mc_filter[0]);
896 macb_writel(bp, HRT, mc_filter[1]);
897 }
898
899 /*
900 * Enable/Disable promiscuous and multicast modes.
901 */
902 static void macb_set_rx_mode(struct net_device *dev)
903 {
904 unsigned long cfg;
905 struct macb *bp = netdev_priv(dev);
906
907 cfg = macb_readl(bp, NCFGR);
908
909 if (dev->flags & IFF_PROMISC)
910 /* Enable promiscuous mode */
911 cfg |= MACB_BIT(CAF);
912 else if (dev->flags & (~IFF_PROMISC))
913 /* Disable promiscuous mode */
914 cfg &= ~MACB_BIT(CAF);
915
916 if (dev->flags & IFF_ALLMULTI) {
917 /* Enable all multicast mode */
918 macb_writel(bp, HRB, -1);
919 macb_writel(bp, HRT, -1);
920 cfg |= MACB_BIT(NCFGR_MTI);
921 } else if (dev->mc_count > 0) {
922 /* Enable specific multicasts */
923 macb_sethashtable(dev);
924 cfg |= MACB_BIT(NCFGR_MTI);
925 } else if (dev->flags & (~IFF_ALLMULTI)) {
926 /* Disable all multicast mode */
927 macb_writel(bp, HRB, 0);
928 macb_writel(bp, HRT, 0);
929 cfg &= ~MACB_BIT(NCFGR_MTI);
930 }
931
932 macb_writel(bp, NCFGR, cfg);
933 }
934
935 static int macb_open(struct net_device *dev)
936 {
937 struct macb *bp = netdev_priv(dev);
938 int err;
939
940 dev_dbg(&bp->pdev->dev, "open\n");
941
942 /* if the phy is not yet register, retry later*/
943 if (!bp->phy_dev)
944 return -EAGAIN;
945
946 if (!is_valid_ether_addr(dev->dev_addr))
947 return -EADDRNOTAVAIL;
948
949 err = macb_alloc_consistent(bp);
950 if (err) {
951 printk(KERN_ERR
952 "%s: Unable to allocate DMA memory (error %d)\n",
953 dev->name, err);
954 return err;
955 }
956
957 napi_enable(&bp->napi);
958
959 macb_init_rings(bp);
960 macb_init_hw(bp);
961
962 /* schedule a link state check */
963 phy_start(bp->phy_dev);
964
965 netif_start_queue(dev);
966
967 return 0;
968 }
969
970 static int macb_close(struct net_device *dev)
971 {
972 struct macb *bp = netdev_priv(dev);
973 unsigned long flags;
974
975 netif_stop_queue(dev);
976 napi_disable(&bp->napi);
977
978 if (bp->phy_dev)
979 phy_stop(bp->phy_dev);
980
981 spin_lock_irqsave(&bp->lock, flags);
982 macb_reset_hw(bp);
983 netif_carrier_off(dev);
984 spin_unlock_irqrestore(&bp->lock, flags);
985
986 macb_free_consistent(bp);
987
988 return 0;
989 }
990
991 static struct net_device_stats *macb_get_stats(struct net_device *dev)
992 {
993 struct macb *bp = netdev_priv(dev);
994 struct net_device_stats *nstat = &bp->stats;
995 struct macb_stats *hwstat = &bp->hw_stats;
996
997 /* read stats from hardware */
998 macb_update_stats(bp);
999
1000 /* Convert HW stats into netdevice stats */
1001 nstat->rx_errors = (hwstat->rx_fcs_errors +
1002 hwstat->rx_align_errors +
1003 hwstat->rx_resource_errors +
1004 hwstat->rx_overruns +
1005 hwstat->rx_oversize_pkts +
1006 hwstat->rx_jabbers +
1007 hwstat->rx_undersize_pkts +
1008 hwstat->sqe_test_errors +
1009 hwstat->rx_length_mismatch);
1010 nstat->tx_errors = (hwstat->tx_late_cols +
1011 hwstat->tx_excessive_cols +
1012 hwstat->tx_underruns +
1013 hwstat->tx_carrier_errors);
1014 nstat->collisions = (hwstat->tx_single_cols +
1015 hwstat->tx_multiple_cols +
1016 hwstat->tx_excessive_cols);
1017 nstat->rx_length_errors = (hwstat->rx_oversize_pkts +
1018 hwstat->rx_jabbers +
1019 hwstat->rx_undersize_pkts +
1020 hwstat->rx_length_mismatch);
1021 nstat->rx_over_errors = hwstat->rx_resource_errors;
1022 nstat->rx_crc_errors = hwstat->rx_fcs_errors;
1023 nstat->rx_frame_errors = hwstat->rx_align_errors;
1024 nstat->rx_fifo_errors = hwstat->rx_overruns;
1025 /* XXX: What does "missed" mean? */
1026 nstat->tx_aborted_errors = hwstat->tx_excessive_cols;
1027 nstat->tx_carrier_errors = hwstat->tx_carrier_errors;
1028 nstat->tx_fifo_errors = hwstat->tx_underruns;
1029 /* Don't know about heartbeat or window errors... */
1030
1031 return nstat;
1032 }
1033
1034 static int macb_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1035 {
1036 struct macb *bp = netdev_priv(dev);
1037 struct phy_device *phydev = bp->phy_dev;
1038
1039 if (!phydev)
1040 return -ENODEV;
1041
1042 return phy_ethtool_gset(phydev, cmd);
1043 }
1044
1045 static int macb_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1046 {
1047 struct macb *bp = netdev_priv(dev);
1048 struct phy_device *phydev = bp->phy_dev;
1049
1050 if (!phydev)
1051 return -ENODEV;
1052
1053 return phy_ethtool_sset(phydev, cmd);
1054 }
1055
1056 static void macb_get_drvinfo(struct net_device *dev,
1057 struct ethtool_drvinfo *info)
1058 {
1059 struct macb *bp = netdev_priv(dev);
1060
1061 strcpy(info->driver, bp->pdev->dev.driver->name);
1062 strcpy(info->version, "$Revision: 1.14 $");
1063 strcpy(info->bus_info, bp->pdev->dev.bus_id);
1064 }
1065
1066 static struct ethtool_ops macb_ethtool_ops = {
1067 .get_settings = macb_get_settings,
1068 .set_settings = macb_set_settings,
1069 .get_drvinfo = macb_get_drvinfo,
1070 .get_link = ethtool_op_get_link,
1071 };
1072
1073 static int macb_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1074 {
1075 struct macb *bp = netdev_priv(dev);
1076 struct phy_device *phydev = bp->phy_dev;
1077
1078 if (!netif_running(dev))
1079 return -EINVAL;
1080
1081 if (!phydev)
1082 return -ENODEV;
1083
1084 return phy_mii_ioctl(phydev, if_mii(rq), cmd);
1085 }
1086
1087 static int __init macb_probe(struct platform_device *pdev)
1088 {
1089 struct eth_platform_data *pdata;
1090 struct resource *regs;
1091 struct net_device *dev;
1092 struct macb *bp;
1093 struct phy_device *phydev;
1094 unsigned long pclk_hz;
1095 u32 config;
1096 int err = -ENXIO;
1097 DECLARE_MAC_BUF(mac);
1098
1099 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1100 if (!regs) {
1101 dev_err(&pdev->dev, "no mmio resource defined\n");
1102 goto err_out;
1103 }
1104
1105 err = -ENOMEM;
1106 dev = alloc_etherdev(sizeof(*bp));
1107 if (!dev) {
1108 dev_err(&pdev->dev, "etherdev alloc failed, aborting.\n");
1109 goto err_out;
1110 }
1111
1112 SET_NETDEV_DEV(dev, &pdev->dev);
1113
1114 /* TODO: Actually, we have some interesting features... */
1115 dev->features |= 0;
1116
1117 bp = netdev_priv(dev);
1118 bp->pdev = pdev;
1119 bp->dev = dev;
1120
1121 spin_lock_init(&bp->lock);
1122
1123 #if defined(CONFIG_ARCH_AT91)
1124 bp->pclk = clk_get(&pdev->dev, "macb_clk");
1125 if (IS_ERR(bp->pclk)) {
1126 dev_err(&pdev->dev, "failed to get macb_clk\n");
1127 goto err_out_free_dev;
1128 }
1129 clk_enable(bp->pclk);
1130 #else
1131 bp->pclk = clk_get(&pdev->dev, "pclk");
1132 if (IS_ERR(bp->pclk)) {
1133 dev_err(&pdev->dev, "failed to get pclk\n");
1134 goto err_out_free_dev;
1135 }
1136 bp->hclk = clk_get(&pdev->dev, "hclk");
1137 if (IS_ERR(bp->hclk)) {
1138 dev_err(&pdev->dev, "failed to get hclk\n");
1139 goto err_out_put_pclk;
1140 }
1141
1142 clk_enable(bp->pclk);
1143 clk_enable(bp->hclk);
1144 #endif
1145
1146 bp->regs = ioremap(regs->start, regs->end - regs->start + 1);
1147 if (!bp->regs) {
1148 dev_err(&pdev->dev, "failed to map registers, aborting.\n");
1149 err = -ENOMEM;
1150 goto err_out_disable_clocks;
1151 }
1152
1153 dev->irq = platform_get_irq(pdev, 0);
1154 err = request_irq(dev->irq, macb_interrupt, IRQF_SAMPLE_RANDOM,
1155 dev->name, dev);
1156 if (err) {
1157 printk(KERN_ERR
1158 "%s: Unable to request IRQ %d (error %d)\n",
1159 dev->name, dev->irq, err);
1160 goto err_out_iounmap;
1161 }
1162
1163 dev->open = macb_open;
1164 dev->stop = macb_close;
1165 dev->hard_start_xmit = macb_start_xmit;
1166 dev->get_stats = macb_get_stats;
1167 dev->set_multicast_list = macb_set_rx_mode;
1168 dev->do_ioctl = macb_ioctl;
1169 netif_napi_add(dev, &bp->napi, macb_poll, 64);
1170 dev->ethtool_ops = &macb_ethtool_ops;
1171
1172 dev->base_addr = regs->start;
1173
1174 /* Set MII management clock divider */
1175 pclk_hz = clk_get_rate(bp->pclk);
1176 if (pclk_hz <= 20000000)
1177 config = MACB_BF(CLK, MACB_CLK_DIV8);
1178 else if (pclk_hz <= 40000000)
1179 config = MACB_BF(CLK, MACB_CLK_DIV16);
1180 else if (pclk_hz <= 80000000)
1181 config = MACB_BF(CLK, MACB_CLK_DIV32);
1182 else
1183 config = MACB_BF(CLK, MACB_CLK_DIV64);
1184 macb_writel(bp, NCFGR, config);
1185
1186 macb_get_hwaddr(bp);
1187 pdata = pdev->dev.platform_data;
1188
1189 if (pdata && pdata->is_rmii)
1190 #if defined(CONFIG_ARCH_AT91)
1191 macb_writel(bp, USRIO, (MACB_BIT(RMII) | MACB_BIT(CLKEN)) );
1192 #else
1193 macb_writel(bp, USRIO, 0);
1194 #endif
1195 else
1196 #if defined(CONFIG_ARCH_AT91)
1197 macb_writel(bp, USRIO, MACB_BIT(CLKEN));
1198 #else
1199 macb_writel(bp, USRIO, MACB_BIT(MII));
1200 #endif
1201
1202 bp->tx_pending = DEF_TX_RING_PENDING;
1203
1204 err = register_netdev(dev);
1205 if (err) {
1206 dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
1207 goto err_out_free_irq;
1208 }
1209
1210 if (macb_mii_init(bp) != 0) {
1211 goto err_out_unregister_netdev;
1212 }
1213
1214 platform_set_drvdata(pdev, dev);
1215
1216 printk(KERN_INFO "%s: Atmel MACB at 0x%08lx irq %d "
1217 "(%s)\n",
1218 dev->name, dev->base_addr, dev->irq,
1219 print_mac(mac, dev->dev_addr));
1220
1221 phydev = bp->phy_dev;
1222 printk(KERN_INFO "%s: attached PHY driver [%s] "
1223 "(mii_bus:phy_addr=%s, irq=%d)\n",
1224 dev->name, phydev->drv->name, phydev->dev.bus_id, phydev->irq);
1225
1226 return 0;
1227
1228 err_out_unregister_netdev:
1229 unregister_netdev(dev);
1230 err_out_free_irq:
1231 free_irq(dev->irq, dev);
1232 err_out_iounmap:
1233 iounmap(bp->regs);
1234 err_out_disable_clocks:
1235 #ifndef CONFIG_ARCH_AT91
1236 clk_disable(bp->hclk);
1237 clk_put(bp->hclk);
1238 #endif
1239 clk_disable(bp->pclk);
1240 #ifndef CONFIG_ARCH_AT91
1241 err_out_put_pclk:
1242 #endif
1243 clk_put(bp->pclk);
1244 err_out_free_dev:
1245 free_netdev(dev);
1246 err_out:
1247 platform_set_drvdata(pdev, NULL);
1248 return err;
1249 }
1250
1251 static int __exit macb_remove(struct platform_device *pdev)
1252 {
1253 struct net_device *dev;
1254 struct macb *bp;
1255
1256 dev = platform_get_drvdata(pdev);
1257
1258 if (dev) {
1259 bp = netdev_priv(dev);
1260 if (bp->phy_dev)
1261 phy_disconnect(bp->phy_dev);
1262 mdiobus_unregister(&bp->mii_bus);
1263 kfree(bp->mii_bus.irq);
1264 unregister_netdev(dev);
1265 free_irq(dev->irq, dev);
1266 iounmap(bp->regs);
1267 #ifndef CONFIG_ARCH_AT91
1268 clk_disable(bp->hclk);
1269 clk_put(bp->hclk);
1270 #endif
1271 clk_disable(bp->pclk);
1272 clk_put(bp->pclk);
1273 free_netdev(dev);
1274 platform_set_drvdata(pdev, NULL);
1275 }
1276
1277 return 0;
1278 }
1279
1280 static struct platform_driver macb_driver = {
1281 .remove = __exit_p(macb_remove),
1282 .driver = {
1283 .name = "macb",
1284 },
1285 };
1286
1287 static int __init macb_init(void)
1288 {
1289 return platform_driver_probe(&macb_driver, macb_probe);
1290 }
1291
1292 static void __exit macb_exit(void)
1293 {
1294 platform_driver_unregister(&macb_driver);
1295 }
1296
1297 module_init(macb_init);
1298 module_exit(macb_exit);
1299
1300 MODULE_LICENSE("GPL");
1301 MODULE_DESCRIPTION("Atmel MACB Ethernet driver");
1302 MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
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