1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Driver for BCM963xx builtin Ethernet mac
4  *
5  * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
6  */
7 #include <linux/init.h>
8 #include <linux/interrupt.h>
9 #include <linux/module.h>
10 #include <linux/clk.h>
11 #include <linux/etherdevice.h>
12 #include <linux/slab.h>
13 #include <linux/delay.h>
14 #include <linux/ethtool.h>
15 #include <linux/crc32.h>
16 #include <linux/err.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/platform_device.h>
19 #include <linux/if_vlan.h>
20 
21 #include <bcm63xx_dev_enet.h>
22 #include "bcm63xx_enet.h"
23 
24 static char bcm_enet_driver_name[] = "bcm63xx_enet";
25 
26 static int copybreak __read_mostly = 128;
27 module_param(copybreak, int, 0);
28 MODULE_PARM_DESC(copybreak, "Receive copy threshold");
29 
30 /* io registers memory shared between all devices */
31 static void __iomem *bcm_enet_shared_base[3];
32 
33 /*
34  * io helpers to access mac registers
35  */
36 static inline u32 enet_readl(struct bcm_enet_priv *priv, u32 off)
37 {
38 	return bcm_readl(priv->base + off);
39 }
40 
41 static inline void enet_writel(struct bcm_enet_priv *priv,
42 			       u32 val, u32 off)
43 {
44 	bcm_writel(val, priv->base + off);
45 }
46 
47 /*
48  * io helpers to access switch registers
49  */
50 static inline u32 enetsw_readl(struct bcm_enet_priv *priv, u32 off)
51 {
52 	return bcm_readl(priv->base + off);
53 }
54 
55 static inline void enetsw_writel(struct bcm_enet_priv *priv,
56 				 u32 val, u32 off)
57 {
58 	bcm_writel(val, priv->base + off);
59 }
60 
61 static inline u16 enetsw_readw(struct bcm_enet_priv *priv, u32 off)
62 {
63 	return bcm_readw(priv->base + off);
64 }
65 
66 static inline void enetsw_writew(struct bcm_enet_priv *priv,
67 				 u16 val, u32 off)
68 {
69 	bcm_writew(val, priv->base + off);
70 }
71 
72 static inline u8 enetsw_readb(struct bcm_enet_priv *priv, u32 off)
73 {
74 	return bcm_readb(priv->base + off);
75 }
76 
77 static inline void enetsw_writeb(struct bcm_enet_priv *priv,
78 				 u8 val, u32 off)
79 {
80 	bcm_writeb(val, priv->base + off);
81 }
82 
83 
84 /* io helpers to access shared registers */
85 static inline u32 enet_dma_readl(struct bcm_enet_priv *priv, u32 off)
86 {
87 	return bcm_readl(bcm_enet_shared_base[0] + off);
88 }
89 
90 static inline void enet_dma_writel(struct bcm_enet_priv *priv,
91 				       u32 val, u32 off)
92 {
93 	bcm_writel(val, bcm_enet_shared_base[0] + off);
94 }
95 
96 static inline u32 enet_dmac_readl(struct bcm_enet_priv *priv, u32 off, int chan)
97 {
98 	return bcm_readl(bcm_enet_shared_base[1] +
99 		bcm63xx_enetdmacreg(off) + chan * priv->dma_chan_width);
100 }
101 
102 static inline void enet_dmac_writel(struct bcm_enet_priv *priv,
103 				       u32 val, u32 off, int chan)
104 {
105 	bcm_writel(val, bcm_enet_shared_base[1] +
106 		bcm63xx_enetdmacreg(off) + chan * priv->dma_chan_width);
107 }
108 
109 static inline u32 enet_dmas_readl(struct bcm_enet_priv *priv, u32 off, int chan)
110 {
111 	return bcm_readl(bcm_enet_shared_base[2] + off + chan * priv->dma_chan_width);
112 }
113 
114 static inline void enet_dmas_writel(struct bcm_enet_priv *priv,
115 				       u32 val, u32 off, int chan)
116 {
117 	bcm_writel(val, bcm_enet_shared_base[2] + off + chan * priv->dma_chan_width);
118 }
119 
120 /*
121  * write given data into mii register and wait for transfer to end
122  * with timeout (average measured transfer time is 25us)
123  */
124 static int do_mdio_op(struct bcm_enet_priv *priv, unsigned int data)
125 {
126 	int limit;
127 
128 	/* make sure mii interrupt status is cleared */
129 	enet_writel(priv, ENET_IR_MII, ENET_IR_REG);
130 
131 	enet_writel(priv, data, ENET_MIIDATA_REG);
132 	wmb();
133 
134 	/* busy wait on mii interrupt bit, with timeout */
135 	limit = 1000;
136 	do {
137 		if (enet_readl(priv, ENET_IR_REG) & ENET_IR_MII)
138 			break;
139 		udelay(1);
140 	} while (limit-- > 0);
141 
142 	return (limit < 0) ? 1 : 0;
143 }
144 
145 /*
146  * MII internal read callback
147  */
148 static int bcm_enet_mdio_read(struct bcm_enet_priv *priv, int mii_id,
149 			      int regnum)
150 {
151 	u32 tmp, val;
152 
153 	tmp = regnum << ENET_MIIDATA_REG_SHIFT;
154 	tmp |= 0x2 << ENET_MIIDATA_TA_SHIFT;
155 	tmp |= mii_id << ENET_MIIDATA_PHYID_SHIFT;
156 	tmp |= ENET_MIIDATA_OP_READ_MASK;
157 
158 	if (do_mdio_op(priv, tmp))
159 		return -1;
160 
161 	val = enet_readl(priv, ENET_MIIDATA_REG);
162 	val &= 0xffff;
163 	return val;
164 }
165 
166 /*
167  * MII internal write callback
168  */
169 static int bcm_enet_mdio_write(struct bcm_enet_priv *priv, int mii_id,
170 			       int regnum, u16 value)
171 {
172 	u32 tmp;
173 
174 	tmp = (value & 0xffff) << ENET_MIIDATA_DATA_SHIFT;
175 	tmp |= 0x2 << ENET_MIIDATA_TA_SHIFT;
176 	tmp |= regnum << ENET_MIIDATA_REG_SHIFT;
177 	tmp |= mii_id << ENET_MIIDATA_PHYID_SHIFT;
178 	tmp |= ENET_MIIDATA_OP_WRITE_MASK;
179 
180 	(void)do_mdio_op(priv, tmp);
181 	return 0;
182 }
183 
184 /*
185  * MII read callback from phylib
186  */
187 static int bcm_enet_mdio_read_phylib(struct mii_bus *bus, int mii_id,
188 				     int regnum)
189 {
190 	return bcm_enet_mdio_read(bus->priv, mii_id, regnum);
191 }
192 
193 /*
194  * MII write callback from phylib
195  */
196 static int bcm_enet_mdio_write_phylib(struct mii_bus *bus, int mii_id,
197 				      int regnum, u16 value)
198 {
199 	return bcm_enet_mdio_write(bus->priv, mii_id, regnum, value);
200 }
201 
202 /*
203  * MII read callback from mii core
204  */
205 static int bcm_enet_mdio_read_mii(struct net_device *dev, int mii_id,
206 				  int regnum)
207 {
208 	return bcm_enet_mdio_read(netdev_priv(dev), mii_id, regnum);
209 }
210 
211 /*
212  * MII write callback from mii core
213  */
214 static void bcm_enet_mdio_write_mii(struct net_device *dev, int mii_id,
215 				    int regnum, int value)
216 {
217 	bcm_enet_mdio_write(netdev_priv(dev), mii_id, regnum, value);
218 }
219 
220 /*
221  * refill rx queue
222  */
223 static int bcm_enet_refill_rx(struct net_device *dev, bool napi_mode)
224 {
225 	struct bcm_enet_priv *priv;
226 
227 	priv = netdev_priv(dev);
228 
229 	while (priv->rx_desc_count < priv->rx_ring_size) {
230 		struct bcm_enet_desc *desc;
231 		int desc_idx;
232 		u32 len_stat;
233 
234 		desc_idx = priv->rx_dirty_desc;
235 		desc = &priv->rx_desc_cpu[desc_idx];
236 
237 		if (!priv->rx_buf[desc_idx]) {
238 			void *buf;
239 
240 			if (likely(napi_mode))
241 				buf = napi_alloc_frag(priv->rx_frag_size);
242 			else
243 				buf = netdev_alloc_frag(priv->rx_frag_size);
244 			if (unlikely(!buf))
245 				break;
246 			priv->rx_buf[desc_idx] = buf;
247 			desc->address = dma_map_single(&priv->pdev->dev,
248 						       buf + priv->rx_buf_offset,
249 						       priv->rx_buf_size,
250 						       DMA_FROM_DEVICE);
251 		}
252 
253 		len_stat = priv->rx_buf_size << DMADESC_LENGTH_SHIFT;
254 		len_stat |= DMADESC_OWNER_MASK;
255 		if (priv->rx_dirty_desc == priv->rx_ring_size - 1) {
256 			len_stat |= (DMADESC_WRAP_MASK >> priv->dma_desc_shift);
257 			priv->rx_dirty_desc = 0;
258 		} else {
259 			priv->rx_dirty_desc++;
260 		}
261 		wmb();
262 		desc->len_stat = len_stat;
263 
264 		priv->rx_desc_count++;
265 
266 		/* tell dma engine we allocated one buffer */
267 		if (priv->dma_has_sram)
268 			enet_dma_writel(priv, 1, ENETDMA_BUFALLOC_REG(priv->rx_chan));
269 		else
270 			enet_dmac_writel(priv, 1, ENETDMAC_BUFALLOC, priv->rx_chan);
271 	}
272 
273 	/* If rx ring is still empty, set a timer to try allocating
274 	 * again at a later time. */
275 	if (priv->rx_desc_count == 0 && netif_running(dev)) {
276 		dev_warn(&priv->pdev->dev, "unable to refill rx ring\n");
277 		priv->rx_timeout.expires = jiffies + HZ;
278 		add_timer(&priv->rx_timeout);
279 	}
280 
281 	return 0;
282 }
283 
284 /*
285  * timer callback to defer refill rx queue in case we're OOM
286  */
287 static void bcm_enet_refill_rx_timer(struct timer_list *t)
288 {
289 	struct bcm_enet_priv *priv = from_timer(priv, t, rx_timeout);
290 	struct net_device *dev = priv->net_dev;
291 
292 	spin_lock(&priv->rx_lock);
293 	bcm_enet_refill_rx(dev, false);
294 	spin_unlock(&priv->rx_lock);
295 }
296 
297 /*
298  * extract packet from rx queue
299  */
300 static int bcm_enet_receive_queue(struct net_device *dev, int budget)
301 {
302 	struct bcm_enet_priv *priv;
303 	struct list_head rx_list;
304 	struct device *kdev;
305 	int processed;
306 
307 	priv = netdev_priv(dev);
308 	INIT_LIST_HEAD(&rx_list);
309 	kdev = &priv->pdev->dev;
310 	processed = 0;
311 
312 	/* don't scan ring further than number of refilled
313 	 * descriptor */
314 	if (budget > priv->rx_desc_count)
315 		budget = priv->rx_desc_count;
316 
317 	do {
318 		struct bcm_enet_desc *desc;
319 		struct sk_buff *skb;
320 		int desc_idx;
321 		u32 len_stat;
322 		unsigned int len;
323 		void *buf;
324 
325 		desc_idx = priv->rx_curr_desc;
326 		desc = &priv->rx_desc_cpu[desc_idx];
327 
328 		/* make sure we actually read the descriptor status at
329 		 * each loop */
330 		rmb();
331 
332 		len_stat = desc->len_stat;
333 
334 		/* break if dma ownership belongs to hw */
335 		if (len_stat & DMADESC_OWNER_MASK)
336 			break;
337 
338 		processed++;
339 		priv->rx_curr_desc++;
340 		if (priv->rx_curr_desc == priv->rx_ring_size)
341 			priv->rx_curr_desc = 0;
342 
343 		/* if the packet does not have start of packet _and_
344 		 * end of packet flag set, then just recycle it */
345 		if ((len_stat & (DMADESC_ESOP_MASK >> priv->dma_desc_shift)) !=
346 			(DMADESC_ESOP_MASK >> priv->dma_desc_shift)) {
347 			dev->stats.rx_dropped++;
348 			continue;
349 		}
350 
351 		/* recycle packet if it's marked as bad */
352 		if (!priv->enet_is_sw &&
353 		    unlikely(len_stat & DMADESC_ERR_MASK)) {
354 			dev->stats.rx_errors++;
355 
356 			if (len_stat & DMADESC_OVSIZE_MASK)
357 				dev->stats.rx_length_errors++;
358 			if (len_stat & DMADESC_CRC_MASK)
359 				dev->stats.rx_crc_errors++;
360 			if (len_stat & DMADESC_UNDER_MASK)
361 				dev->stats.rx_frame_errors++;
362 			if (len_stat & DMADESC_OV_MASK)
363 				dev->stats.rx_fifo_errors++;
364 			continue;
365 		}
366 
367 		/* valid packet */
368 		buf = priv->rx_buf[desc_idx];
369 		len = (len_stat & DMADESC_LENGTH_MASK) >> DMADESC_LENGTH_SHIFT;
370 		/* don't include FCS */
371 		len -= 4;
372 
373 		if (len < copybreak) {
374 			skb = napi_alloc_skb(&priv->napi, len);
375 			if (unlikely(!skb)) {
376 				/* forget packet, just rearm desc */
377 				dev->stats.rx_dropped++;
378 				continue;
379 			}
380 
381 			dma_sync_single_for_cpu(kdev, desc->address,
382 						len, DMA_FROM_DEVICE);
383 			memcpy(skb->data, buf + priv->rx_buf_offset, len);
384 			dma_sync_single_for_device(kdev, desc->address,
385 						   len, DMA_FROM_DEVICE);
386 		} else {
387 			dma_unmap_single(kdev, desc->address,
388 					 priv->rx_buf_size, DMA_FROM_DEVICE);
389 			priv->rx_buf[desc_idx] = NULL;
390 
391 			skb = napi_build_skb(buf, priv->rx_frag_size);
392 			if (unlikely(!skb)) {
393 				skb_free_frag(buf);
394 				dev->stats.rx_dropped++;
395 				continue;
396 			}
397 			skb_reserve(skb, priv->rx_buf_offset);
398 		}
399 
400 		skb_put(skb, len);
401 		skb->protocol = eth_type_trans(skb, dev);
402 		dev->stats.rx_packets++;
403 		dev->stats.rx_bytes += len;
404 		list_add_tail(&skb->list, &rx_list);
405 
406 	} while (processed < budget);
407 
408 	netif_receive_skb_list(&rx_list);
409 	priv->rx_desc_count -= processed;
410 
411 	if (processed || !priv->rx_desc_count) {
412 		bcm_enet_refill_rx(dev, true);
413 
414 		/* kick rx dma */
415 		enet_dmac_writel(priv, priv->dma_chan_en_mask,
416 					 ENETDMAC_CHANCFG, priv->rx_chan);
417 	}
418 
419 	return processed;
420 }
421 
422 
423 /*
424  * try to or force reclaim of transmitted buffers
425  */
426 static int bcm_enet_tx_reclaim(struct net_device *dev, int force, int budget)
427 {
428 	struct bcm_enet_priv *priv;
429 	unsigned int bytes;
430 	int released;
431 
432 	priv = netdev_priv(dev);
433 	bytes = 0;
434 	released = 0;
435 
436 	while (priv->tx_desc_count < priv->tx_ring_size) {
437 		struct bcm_enet_desc *desc;
438 		struct sk_buff *skb;
439 
440 		/* We run in a bh and fight against start_xmit, which
441 		 * is called with bh disabled  */
442 		spin_lock(&priv->tx_lock);
443 
444 		desc = &priv->tx_desc_cpu[priv->tx_dirty_desc];
445 
446 		if (!force && (desc->len_stat & DMADESC_OWNER_MASK)) {
447 			spin_unlock(&priv->tx_lock);
448 			break;
449 		}
450 
451 		/* ensure other field of the descriptor were not read
452 		 * before we checked ownership */
453 		rmb();
454 
455 		skb = priv->tx_skb[priv->tx_dirty_desc];
456 		priv->tx_skb[priv->tx_dirty_desc] = NULL;
457 		dma_unmap_single(&priv->pdev->dev, desc->address, skb->len,
458 				 DMA_TO_DEVICE);
459 
460 		priv->tx_dirty_desc++;
461 		if (priv->tx_dirty_desc == priv->tx_ring_size)
462 			priv->tx_dirty_desc = 0;
463 		priv->tx_desc_count++;
464 
465 		spin_unlock(&priv->tx_lock);
466 
467 		if (desc->len_stat & DMADESC_UNDER_MASK)
468 			dev->stats.tx_errors++;
469 
470 		bytes += skb->len;
471 		napi_consume_skb(skb, budget);
472 		released++;
473 	}
474 
475 	netdev_completed_queue(dev, released, bytes);
476 
477 	if (netif_queue_stopped(dev) && released)
478 		netif_wake_queue(dev);
479 
480 	return released;
481 }
482 
483 /*
484  * poll func, called by network core
485  */
486 static int bcm_enet_poll(struct napi_struct *napi, int budget)
487 {
488 	struct bcm_enet_priv *priv;
489 	struct net_device *dev;
490 	int rx_work_done;
491 
492 	priv = container_of(napi, struct bcm_enet_priv, napi);
493 	dev = priv->net_dev;
494 
495 	/* ack interrupts */
496 	enet_dmac_writel(priv, priv->dma_chan_int_mask,
497 			 ENETDMAC_IR, priv->rx_chan);
498 	enet_dmac_writel(priv, priv->dma_chan_int_mask,
499 			 ENETDMAC_IR, priv->tx_chan);
500 
501 	/* reclaim sent skb */
502 	bcm_enet_tx_reclaim(dev, 0, budget);
503 
504 	spin_lock(&priv->rx_lock);
505 	rx_work_done = bcm_enet_receive_queue(dev, budget);
506 	spin_unlock(&priv->rx_lock);
507 
508 	if (rx_work_done >= budget) {
509 		/* rx queue is not yet empty/clean */
510 		return rx_work_done;
511 	}
512 
513 	/* no more packet in rx/tx queue, remove device from poll
514 	 * queue */
515 	napi_complete_done(napi, rx_work_done);
516 
517 	/* restore rx/tx interrupt */
518 	enet_dmac_writel(priv, priv->dma_chan_int_mask,
519 			 ENETDMAC_IRMASK, priv->rx_chan);
520 	enet_dmac_writel(priv, priv->dma_chan_int_mask,
521 			 ENETDMAC_IRMASK, priv->tx_chan);
522 
523 	return rx_work_done;
524 }
525 
526 /*
527  * mac interrupt handler
528  */
529 static irqreturn_t bcm_enet_isr_mac(int irq, void *dev_id)
530 {
531 	struct net_device *dev;
532 	struct bcm_enet_priv *priv;
533 	u32 stat;
534 
535 	dev = dev_id;
536 	priv = netdev_priv(dev);
537 
538 	stat = enet_readl(priv, ENET_IR_REG);
539 	if (!(stat & ENET_IR_MIB))
540 		return IRQ_NONE;
541 
542 	/* clear & mask interrupt */
543 	enet_writel(priv, ENET_IR_MIB, ENET_IR_REG);
544 	enet_writel(priv, 0, ENET_IRMASK_REG);
545 
546 	/* read mib registers in workqueue */
547 	schedule_work(&priv->mib_update_task);
548 
549 	return IRQ_HANDLED;
550 }
551 
552 /*
553  * rx/tx dma interrupt handler
554  */
555 static irqreturn_t bcm_enet_isr_dma(int irq, void *dev_id)
556 {
557 	struct net_device *dev;
558 	struct bcm_enet_priv *priv;
559 
560 	dev = dev_id;
561 	priv = netdev_priv(dev);
562 
563 	/* mask rx/tx interrupts */
564 	enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->rx_chan);
565 	enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->tx_chan);
566 
567 	napi_schedule(&priv->napi);
568 
569 	return IRQ_HANDLED;
570 }
571 
572 /*
573  * tx request callback
574  */
575 static netdev_tx_t
576 bcm_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
577 {
578 	struct bcm_enet_priv *priv;
579 	struct bcm_enet_desc *desc;
580 	u32 len_stat;
581 	netdev_tx_t ret;
582 
583 	priv = netdev_priv(dev);
584 
585 	/* lock against tx reclaim */
586 	spin_lock(&priv->tx_lock);
587 
588 	/* make sure  the tx hw queue  is not full,  should not happen
589 	 * since we stop queue before it's the case */
590 	if (unlikely(!priv->tx_desc_count)) {
591 		netif_stop_queue(dev);
592 		dev_err(&priv->pdev->dev, "xmit called with no tx desc "
593 			"available?\n");
594 		ret = NETDEV_TX_BUSY;
595 		goto out_unlock;
596 	}
597 
598 	/* pad small packets sent on a switch device */
599 	if (priv->enet_is_sw && skb->len < 64) {
600 		int needed = 64 - skb->len;
601 		char *data;
602 
603 		if (unlikely(skb_tailroom(skb) < needed)) {
604 			struct sk_buff *nskb;
605 
606 			nskb = skb_copy_expand(skb, 0, needed, GFP_ATOMIC);
607 			if (!nskb) {
608 				ret = NETDEV_TX_BUSY;
609 				goto out_unlock;
610 			}
611 			dev_kfree_skb(skb);
612 			skb = nskb;
613 		}
614 		data = skb_put_zero(skb, needed);
615 	}
616 
617 	/* point to the next available desc */
618 	desc = &priv->tx_desc_cpu[priv->tx_curr_desc];
619 	priv->tx_skb[priv->tx_curr_desc] = skb;
620 
621 	/* fill descriptor */
622 	desc->address = dma_map_single(&priv->pdev->dev, skb->data, skb->len,
623 				       DMA_TO_DEVICE);
624 
625 	len_stat = (skb->len << DMADESC_LENGTH_SHIFT) & DMADESC_LENGTH_MASK;
626 	len_stat |= (DMADESC_ESOP_MASK >> priv->dma_desc_shift) |
627 		DMADESC_APPEND_CRC |
628 		DMADESC_OWNER_MASK;
629 
630 	priv->tx_curr_desc++;
631 	if (priv->tx_curr_desc == priv->tx_ring_size) {
632 		priv->tx_curr_desc = 0;
633 		len_stat |= (DMADESC_WRAP_MASK >> priv->dma_desc_shift);
634 	}
635 	priv->tx_desc_count--;
636 
637 	/* dma might be already polling, make sure we update desc
638 	 * fields in correct order */
639 	wmb();
640 	desc->len_stat = len_stat;
641 	wmb();
642 
643 	netdev_sent_queue(dev, skb->len);
644 
645 	/* kick tx dma */
646 	if (!netdev_xmit_more() || !priv->tx_desc_count)
647 		enet_dmac_writel(priv, priv->dma_chan_en_mask,
648 				 ENETDMAC_CHANCFG, priv->tx_chan);
649 
650 	/* stop queue if no more desc available */
651 	if (!priv->tx_desc_count)
652 		netif_stop_queue(dev);
653 
654 	dev->stats.tx_bytes += skb->len;
655 	dev->stats.tx_packets++;
656 	ret = NETDEV_TX_OK;
657 
658 out_unlock:
659 	spin_unlock(&priv->tx_lock);
660 	return ret;
661 }
662 
663 /*
664  * Change the interface's mac address.
665  */
666 static int bcm_enet_set_mac_address(struct net_device *dev, void *p)
667 {
668 	struct bcm_enet_priv *priv;
669 	struct sockaddr *addr = p;
670 	u32 val;
671 
672 	priv = netdev_priv(dev);
673 	eth_hw_addr_set(dev, addr->sa_data);
674 
675 	/* use perfect match register 0 to store my mac address */
676 	val = (dev->dev_addr[2] << 24) | (dev->dev_addr[3] << 16) |
677 		(dev->dev_addr[4] << 8) | dev->dev_addr[5];
678 	enet_writel(priv, val, ENET_PML_REG(0));
679 
680 	val = (dev->dev_addr[0] << 8 | dev->dev_addr[1]);
681 	val |= ENET_PMH_DATAVALID_MASK;
682 	enet_writel(priv, val, ENET_PMH_REG(0));
683 
684 	return 0;
685 }
686 
687 /*
688  * Change rx mode (promiscuous/allmulti) and update multicast list
689  */
690 static void bcm_enet_set_multicast_list(struct net_device *dev)
691 {
692 	struct bcm_enet_priv *priv;
693 	struct netdev_hw_addr *ha;
694 	u32 val;
695 	int i;
696 
697 	priv = netdev_priv(dev);
698 
699 	val = enet_readl(priv, ENET_RXCFG_REG);
700 
701 	if (dev->flags & IFF_PROMISC)
702 		val |= ENET_RXCFG_PROMISC_MASK;
703 	else
704 		val &= ~ENET_RXCFG_PROMISC_MASK;
705 
706 	/* only 3 perfect match registers left, first one is used for
707 	 * own mac address */
708 	if ((dev->flags & IFF_ALLMULTI) || netdev_mc_count(dev) > 3)
709 		val |= ENET_RXCFG_ALLMCAST_MASK;
710 	else
711 		val &= ~ENET_RXCFG_ALLMCAST_MASK;
712 
713 	/* no need to set perfect match registers if we catch all
714 	 * multicast */
715 	if (val & ENET_RXCFG_ALLMCAST_MASK) {
716 		enet_writel(priv, val, ENET_RXCFG_REG);
717 		return;
718 	}
719 
720 	i = 0;
721 	netdev_for_each_mc_addr(ha, dev) {
722 		u8 *dmi_addr;
723 		u32 tmp;
724 
725 		if (i == 3)
726 			break;
727 		/* update perfect match registers */
728 		dmi_addr = ha->addr;
729 		tmp = (dmi_addr[2] << 24) | (dmi_addr[3] << 16) |
730 			(dmi_addr[4] << 8) | dmi_addr[5];
731 		enet_writel(priv, tmp, ENET_PML_REG(i + 1));
732 
733 		tmp = (dmi_addr[0] << 8 | dmi_addr[1]);
734 		tmp |= ENET_PMH_DATAVALID_MASK;
735 		enet_writel(priv, tmp, ENET_PMH_REG(i++ + 1));
736 	}
737 
738 	for (; i < 3; i++) {
739 		enet_writel(priv, 0, ENET_PML_REG(i + 1));
740 		enet_writel(priv, 0, ENET_PMH_REG(i + 1));
741 	}
742 
743 	enet_writel(priv, val, ENET_RXCFG_REG);
744 }
745 
746 /*
747  * set mac duplex parameters
748  */
749 static void bcm_enet_set_duplex(struct bcm_enet_priv *priv, int fullduplex)
750 {
751 	u32 val;
752 
753 	val = enet_readl(priv, ENET_TXCTL_REG);
754 	if (fullduplex)
755 		val |= ENET_TXCTL_FD_MASK;
756 	else
757 		val &= ~ENET_TXCTL_FD_MASK;
758 	enet_writel(priv, val, ENET_TXCTL_REG);
759 }
760 
761 /*
762  * set mac flow control parameters
763  */
764 static void bcm_enet_set_flow(struct bcm_enet_priv *priv, int rx_en, int tx_en)
765 {
766 	u32 val;
767 
768 	/* rx flow control (pause frame handling) */
769 	val = enet_readl(priv, ENET_RXCFG_REG);
770 	if (rx_en)
771 		val |= ENET_RXCFG_ENFLOW_MASK;
772 	else
773 		val &= ~ENET_RXCFG_ENFLOW_MASK;
774 	enet_writel(priv, val, ENET_RXCFG_REG);
775 
776 	if (!priv->dma_has_sram)
777 		return;
778 
779 	/* tx flow control (pause frame generation) */
780 	val = enet_dma_readl(priv, ENETDMA_CFG_REG);
781 	if (tx_en)
782 		val |= ENETDMA_CFG_FLOWCH_MASK(priv->rx_chan);
783 	else
784 		val &= ~ENETDMA_CFG_FLOWCH_MASK(priv->rx_chan);
785 	enet_dma_writel(priv, val, ENETDMA_CFG_REG);
786 }
787 
788 /*
789  * link changed callback (from phylib)
790  */
791 static void bcm_enet_adjust_phy_link(struct net_device *dev)
792 {
793 	struct bcm_enet_priv *priv;
794 	struct phy_device *phydev;
795 	int status_changed;
796 
797 	priv = netdev_priv(dev);
798 	phydev = dev->phydev;
799 	status_changed = 0;
800 
801 	if (priv->old_link != phydev->link) {
802 		status_changed = 1;
803 		priv->old_link = phydev->link;
804 	}
805 
806 	/* reflect duplex change in mac configuration */
807 	if (phydev->link && phydev->duplex != priv->old_duplex) {
808 		bcm_enet_set_duplex(priv,
809 				    (phydev->duplex == DUPLEX_FULL) ? 1 : 0);
810 		status_changed = 1;
811 		priv->old_duplex = phydev->duplex;
812 	}
813 
814 	/* enable flow control if remote advertise it (trust phylib to
815 	 * check that duplex is full */
816 	if (phydev->link && phydev->pause != priv->old_pause) {
817 		int rx_pause_en, tx_pause_en;
818 
819 		if (phydev->pause) {
820 			/* pause was advertised by lpa and us */
821 			rx_pause_en = 1;
822 			tx_pause_en = 1;
823 		} else if (!priv->pause_auto) {
824 			/* pause setting overridden by user */
825 			rx_pause_en = priv->pause_rx;
826 			tx_pause_en = priv->pause_tx;
827 		} else {
828 			rx_pause_en = 0;
829 			tx_pause_en = 0;
830 		}
831 
832 		bcm_enet_set_flow(priv, rx_pause_en, tx_pause_en);
833 		status_changed = 1;
834 		priv->old_pause = phydev->pause;
835 	}
836 
837 	if (status_changed) {
838 		pr_info("%s: link %s", dev->name, phydev->link ?
839 			"UP" : "DOWN");
840 		if (phydev->link)
841 			pr_cont(" - %d/%s - flow control %s", phydev->speed,
842 			       DUPLEX_FULL == phydev->duplex ? "full" : "half",
843 			       phydev->pause == 1 ? "rx&tx" : "off");
844 
845 		pr_cont("\n");
846 	}
847 }
848 
849 /*
850  * link changed callback (if phylib is not used)
851  */
852 static void bcm_enet_adjust_link(struct net_device *dev)
853 {
854 	struct bcm_enet_priv *priv;
855 
856 	priv = netdev_priv(dev);
857 	bcm_enet_set_duplex(priv, priv->force_duplex_full);
858 	bcm_enet_set_flow(priv, priv->pause_rx, priv->pause_tx);
859 	netif_carrier_on(dev);
860 
861 	pr_info("%s: link forced UP - %d/%s - flow control %s/%s\n",
862 		dev->name,
863 		priv->force_speed_100 ? 100 : 10,
864 		priv->force_duplex_full ? "full" : "half",
865 		priv->pause_rx ? "rx" : "off",
866 		priv->pause_tx ? "tx" : "off");
867 }
868 
869 static void bcm_enet_free_rx_buf_ring(struct device *kdev, struct bcm_enet_priv *priv)
870 {
871 	int i;
872 
873 	for (i = 0; i < priv->rx_ring_size; i++) {
874 		struct bcm_enet_desc *desc;
875 
876 		if (!priv->rx_buf[i])
877 			continue;
878 
879 		desc = &priv->rx_desc_cpu[i];
880 		dma_unmap_single(kdev, desc->address, priv->rx_buf_size,
881 				 DMA_FROM_DEVICE);
882 		skb_free_frag(priv->rx_buf[i]);
883 	}
884 	kfree(priv->rx_buf);
885 }
886 
887 /*
888  * open callback, allocate dma rings & buffers and start rx operation
889  */
890 static int bcm_enet_open(struct net_device *dev)
891 {
892 	struct bcm_enet_priv *priv;
893 	struct sockaddr addr;
894 	struct device *kdev;
895 	struct phy_device *phydev;
896 	int i, ret;
897 	unsigned int size;
898 	char phy_id[MII_BUS_ID_SIZE + 3];
899 	void *p;
900 	u32 val;
901 
902 	priv = netdev_priv(dev);
903 	kdev = &priv->pdev->dev;
904 
905 	if (priv->has_phy) {
906 		/* connect to PHY */
907 		snprintf(phy_id, sizeof(phy_id), PHY_ID_FMT,
908 			 priv->mii_bus->id, priv->phy_id);
909 
910 		phydev = phy_connect(dev, phy_id, bcm_enet_adjust_phy_link,
911 				     PHY_INTERFACE_MODE_MII);
912 
913 		if (IS_ERR(phydev)) {
914 			dev_err(kdev, "could not attach to PHY\n");
915 			return PTR_ERR(phydev);
916 		}
917 
918 		/* mask with MAC supported features */
919 		phy_support_sym_pause(phydev);
920 		phy_set_max_speed(phydev, SPEED_100);
921 		phy_set_sym_pause(phydev, priv->pause_rx, priv->pause_rx,
922 				  priv->pause_auto);
923 
924 		phy_attached_info(phydev);
925 
926 		priv->old_link = 0;
927 		priv->old_duplex = -1;
928 		priv->old_pause = -1;
929 	} else {
930 		phydev = NULL;
931 	}
932 
933 	/* mask all interrupts and request them */
934 	enet_writel(priv, 0, ENET_IRMASK_REG);
935 	enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->rx_chan);
936 	enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->tx_chan);
937 
938 	ret = request_irq(dev->irq, bcm_enet_isr_mac, 0, dev->name, dev);
939 	if (ret)
940 		goto out_phy_disconnect;
941 
942 	ret = request_irq(priv->irq_rx, bcm_enet_isr_dma, 0,
943 			  dev->name, dev);
944 	if (ret)
945 		goto out_freeirq;
946 
947 	ret = request_irq(priv->irq_tx, bcm_enet_isr_dma,
948 			  0, dev->name, dev);
949 	if (ret)
950 		goto out_freeirq_rx;
951 
952 	/* initialize perfect match registers */
953 	for (i = 0; i < 4; i++) {
954 		enet_writel(priv, 0, ENET_PML_REG(i));
955 		enet_writel(priv, 0, ENET_PMH_REG(i));
956 	}
957 
958 	/* write device mac address */
959 	memcpy(addr.sa_data, dev->dev_addr, ETH_ALEN);
960 	bcm_enet_set_mac_address(dev, &addr);
961 
962 	/* allocate rx dma ring */
963 	size = priv->rx_ring_size * sizeof(struct bcm_enet_desc);
964 	p = dma_alloc_coherent(kdev, size, &priv->rx_desc_dma, GFP_KERNEL);
965 	if (!p) {
966 		ret = -ENOMEM;
967 		goto out_freeirq_tx;
968 	}
969 
970 	priv->rx_desc_alloc_size = size;
971 	priv->rx_desc_cpu = p;
972 
973 	/* allocate tx dma ring */
974 	size = priv->tx_ring_size * sizeof(struct bcm_enet_desc);
975 	p = dma_alloc_coherent(kdev, size, &priv->tx_desc_dma, GFP_KERNEL);
976 	if (!p) {
977 		ret = -ENOMEM;
978 		goto out_free_rx_ring;
979 	}
980 
981 	priv->tx_desc_alloc_size = size;
982 	priv->tx_desc_cpu = p;
983 
984 	priv->tx_skb = kcalloc(priv->tx_ring_size, sizeof(struct sk_buff *),
985 			       GFP_KERNEL);
986 	if (!priv->tx_skb) {
987 		ret = -ENOMEM;
988 		goto out_free_tx_ring;
989 	}
990 
991 	priv->tx_desc_count = priv->tx_ring_size;
992 	priv->tx_dirty_desc = 0;
993 	priv->tx_curr_desc = 0;
994 	spin_lock_init(&priv->tx_lock);
995 
996 	/* init & fill rx ring with buffers */
997 	priv->rx_buf = kcalloc(priv->rx_ring_size, sizeof(void *),
998 			       GFP_KERNEL);
999 	if (!priv->rx_buf) {
1000 		ret = -ENOMEM;
1001 		goto out_free_tx_skb;
1002 	}
1003 
1004 	priv->rx_desc_count = 0;
1005 	priv->rx_dirty_desc = 0;
1006 	priv->rx_curr_desc = 0;
1007 
1008 	/* initialize flow control buffer allocation */
1009 	if (priv->dma_has_sram)
1010 		enet_dma_writel(priv, ENETDMA_BUFALLOC_FORCE_MASK | 0,
1011 				ENETDMA_BUFALLOC_REG(priv->rx_chan));
1012 	else
1013 		enet_dmac_writel(priv, ENETDMA_BUFALLOC_FORCE_MASK | 0,
1014 				ENETDMAC_BUFALLOC, priv->rx_chan);
1015 
1016 	if (bcm_enet_refill_rx(dev, false)) {
1017 		dev_err(kdev, "cannot allocate rx buffer queue\n");
1018 		ret = -ENOMEM;
1019 		goto out;
1020 	}
1021 
1022 	/* write rx & tx ring addresses */
1023 	if (priv->dma_has_sram) {
1024 		enet_dmas_writel(priv, priv->rx_desc_dma,
1025 				 ENETDMAS_RSTART_REG, priv->rx_chan);
1026 		enet_dmas_writel(priv, priv->tx_desc_dma,
1027 			 ENETDMAS_RSTART_REG, priv->tx_chan);
1028 	} else {
1029 		enet_dmac_writel(priv, priv->rx_desc_dma,
1030 				ENETDMAC_RSTART, priv->rx_chan);
1031 		enet_dmac_writel(priv, priv->tx_desc_dma,
1032 				ENETDMAC_RSTART, priv->tx_chan);
1033 	}
1034 
1035 	/* clear remaining state ram for rx & tx channel */
1036 	if (priv->dma_has_sram) {
1037 		enet_dmas_writel(priv, 0, ENETDMAS_SRAM2_REG, priv->rx_chan);
1038 		enet_dmas_writel(priv, 0, ENETDMAS_SRAM2_REG, priv->tx_chan);
1039 		enet_dmas_writel(priv, 0, ENETDMAS_SRAM3_REG, priv->rx_chan);
1040 		enet_dmas_writel(priv, 0, ENETDMAS_SRAM3_REG, priv->tx_chan);
1041 		enet_dmas_writel(priv, 0, ENETDMAS_SRAM4_REG, priv->rx_chan);
1042 		enet_dmas_writel(priv, 0, ENETDMAS_SRAM4_REG, priv->tx_chan);
1043 	} else {
1044 		enet_dmac_writel(priv, 0, ENETDMAC_FC, priv->rx_chan);
1045 		enet_dmac_writel(priv, 0, ENETDMAC_FC, priv->tx_chan);
1046 	}
1047 
1048 	/* set max rx/tx length */
1049 	enet_writel(priv, priv->hw_mtu, ENET_RXMAXLEN_REG);
1050 	enet_writel(priv, priv->hw_mtu, ENET_TXMAXLEN_REG);
1051 
1052 	/* set dma maximum burst len */
1053 	enet_dmac_writel(priv, priv->dma_maxburst,
1054 			 ENETDMAC_MAXBURST, priv->rx_chan);
1055 	enet_dmac_writel(priv, priv->dma_maxburst,
1056 			 ENETDMAC_MAXBURST, priv->tx_chan);
1057 
1058 	/* set correct transmit fifo watermark */
1059 	enet_writel(priv, BCMENET_TX_FIFO_TRESH, ENET_TXWMARK_REG);
1060 
1061 	/* set flow control low/high threshold to 1/3 / 2/3 */
1062 	if (priv->dma_has_sram) {
1063 		val = priv->rx_ring_size / 3;
1064 		enet_dma_writel(priv, val, ENETDMA_FLOWCL_REG(priv->rx_chan));
1065 		val = (priv->rx_ring_size * 2) / 3;
1066 		enet_dma_writel(priv, val, ENETDMA_FLOWCH_REG(priv->rx_chan));
1067 	} else {
1068 		enet_dmac_writel(priv, 5, ENETDMAC_FC, priv->rx_chan);
1069 		enet_dmac_writel(priv, priv->rx_ring_size, ENETDMAC_LEN, priv->rx_chan);
1070 		enet_dmac_writel(priv, priv->tx_ring_size, ENETDMAC_LEN, priv->tx_chan);
1071 	}
1072 
1073 	/* all set, enable mac and interrupts, start dma engine and
1074 	 * kick rx dma channel */
1075 	wmb();
1076 	val = enet_readl(priv, ENET_CTL_REG);
1077 	val |= ENET_CTL_ENABLE_MASK;
1078 	enet_writel(priv, val, ENET_CTL_REG);
1079 	if (priv->dma_has_sram)
1080 		enet_dma_writel(priv, ENETDMA_CFG_EN_MASK, ENETDMA_CFG_REG);
1081 	enet_dmac_writel(priv, priv->dma_chan_en_mask,
1082 			 ENETDMAC_CHANCFG, priv->rx_chan);
1083 
1084 	/* watch "mib counters about to overflow" interrupt */
1085 	enet_writel(priv, ENET_IR_MIB, ENET_IR_REG);
1086 	enet_writel(priv, ENET_IR_MIB, ENET_IRMASK_REG);
1087 
1088 	/* watch "packet transferred" interrupt in rx and tx */
1089 	enet_dmac_writel(priv, priv->dma_chan_int_mask,
1090 			 ENETDMAC_IR, priv->rx_chan);
1091 	enet_dmac_writel(priv, priv->dma_chan_int_mask,
1092 			 ENETDMAC_IR, priv->tx_chan);
1093 
1094 	/* make sure we enable napi before rx interrupt  */
1095 	napi_enable(&priv->napi);
1096 
1097 	enet_dmac_writel(priv, priv->dma_chan_int_mask,
1098 			 ENETDMAC_IRMASK, priv->rx_chan);
1099 	enet_dmac_writel(priv, priv->dma_chan_int_mask,
1100 			 ENETDMAC_IRMASK, priv->tx_chan);
1101 
1102 	if (phydev)
1103 		phy_start(phydev);
1104 	else
1105 		bcm_enet_adjust_link(dev);
1106 
1107 	netif_start_queue(dev);
1108 	return 0;
1109 
1110 out:
1111 	bcm_enet_free_rx_buf_ring(kdev, priv);
1112 
1113 out_free_tx_skb:
1114 	kfree(priv->tx_skb);
1115 
1116 out_free_tx_ring:
1117 	dma_free_coherent(kdev, priv->tx_desc_alloc_size,
1118 			  priv->tx_desc_cpu, priv->tx_desc_dma);
1119 
1120 out_free_rx_ring:
1121 	dma_free_coherent(kdev, priv->rx_desc_alloc_size,
1122 			  priv->rx_desc_cpu, priv->rx_desc_dma);
1123 
1124 out_freeirq_tx:
1125 	free_irq(priv->irq_tx, dev);
1126 
1127 out_freeirq_rx:
1128 	free_irq(priv->irq_rx, dev);
1129 
1130 out_freeirq:
1131 	free_irq(dev->irq, dev);
1132 
1133 out_phy_disconnect:
1134 	if (phydev)
1135 		phy_disconnect(phydev);
1136 
1137 	return ret;
1138 }
1139 
1140 /*
1141  * disable mac
1142  */
1143 static void bcm_enet_disable_mac(struct bcm_enet_priv *priv)
1144 {
1145 	int limit;
1146 	u32 val;
1147 
1148 	val = enet_readl(priv, ENET_CTL_REG);
1149 	val |= ENET_CTL_DISABLE_MASK;
1150 	enet_writel(priv, val, ENET_CTL_REG);
1151 
1152 	limit = 1000;
1153 	do {
1154 		u32 val;
1155 
1156 		val = enet_readl(priv, ENET_CTL_REG);
1157 		if (!(val & ENET_CTL_DISABLE_MASK))
1158 			break;
1159 		udelay(1);
1160 	} while (limit--);
1161 }
1162 
1163 /*
1164  * disable dma in given channel
1165  */
1166 static void bcm_enet_disable_dma(struct bcm_enet_priv *priv, int chan)
1167 {
1168 	int limit;
1169 
1170 	enet_dmac_writel(priv, 0, ENETDMAC_CHANCFG, chan);
1171 
1172 	limit = 1000;
1173 	do {
1174 		u32 val;
1175 
1176 		val = enet_dmac_readl(priv, ENETDMAC_CHANCFG, chan);
1177 		if (!(val & ENETDMAC_CHANCFG_EN_MASK))
1178 			break;
1179 		udelay(1);
1180 	} while (limit--);
1181 }
1182 
1183 /*
1184  * stop callback
1185  */
1186 static int bcm_enet_stop(struct net_device *dev)
1187 {
1188 	struct bcm_enet_priv *priv;
1189 	struct device *kdev;
1190 
1191 	priv = netdev_priv(dev);
1192 	kdev = &priv->pdev->dev;
1193 
1194 	netif_stop_queue(dev);
1195 	napi_disable(&priv->napi);
1196 	if (priv->has_phy)
1197 		phy_stop(dev->phydev);
1198 	del_timer_sync(&priv->rx_timeout);
1199 
1200 	/* mask all interrupts */
1201 	enet_writel(priv, 0, ENET_IRMASK_REG);
1202 	enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->rx_chan);
1203 	enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->tx_chan);
1204 
1205 	/* make sure no mib update is scheduled */
1206 	cancel_work_sync(&priv->mib_update_task);
1207 
1208 	/* disable dma & mac */
1209 	bcm_enet_disable_dma(priv, priv->tx_chan);
1210 	bcm_enet_disable_dma(priv, priv->rx_chan);
1211 	bcm_enet_disable_mac(priv);
1212 
1213 	/* force reclaim of all tx buffers */
1214 	bcm_enet_tx_reclaim(dev, 1, 0);
1215 
1216 	/* free the rx buffer ring */
1217 	bcm_enet_free_rx_buf_ring(kdev, priv);
1218 
1219 	/* free remaining allocated memory */
1220 	kfree(priv->tx_skb);
1221 	dma_free_coherent(kdev, priv->rx_desc_alloc_size,
1222 			  priv->rx_desc_cpu, priv->rx_desc_dma);
1223 	dma_free_coherent(kdev, priv->tx_desc_alloc_size,
1224 			  priv->tx_desc_cpu, priv->tx_desc_dma);
1225 	free_irq(priv->irq_tx, dev);
1226 	free_irq(priv->irq_rx, dev);
1227 	free_irq(dev->irq, dev);
1228 
1229 	/* release phy */
1230 	if (priv->has_phy)
1231 		phy_disconnect(dev->phydev);
1232 
1233 	/* reset BQL after forced tx reclaim to prevent kernel panic */
1234 	netdev_reset_queue(dev);
1235 
1236 	return 0;
1237 }
1238 
1239 /*
1240  * ethtool callbacks
1241  */
1242 struct bcm_enet_stats {
1243 	char stat_string[ETH_GSTRING_LEN];
1244 	int sizeof_stat;
1245 	int stat_offset;
1246 	int mib_reg;
1247 };
1248 
1249 #define GEN_STAT(m) sizeof(((struct bcm_enet_priv *)0)->m),		\
1250 		     offsetof(struct bcm_enet_priv, m)
1251 #define DEV_STAT(m) sizeof(((struct net_device_stats *)0)->m),		\
1252 		     offsetof(struct net_device_stats, m)
1253 
1254 static const struct bcm_enet_stats bcm_enet_gstrings_stats[] = {
1255 	{ "rx_packets", DEV_STAT(rx_packets), -1 },
1256 	{ "tx_packets",	DEV_STAT(tx_packets), -1 },
1257 	{ "rx_bytes", DEV_STAT(rx_bytes), -1 },
1258 	{ "tx_bytes", DEV_STAT(tx_bytes), -1 },
1259 	{ "rx_errors", DEV_STAT(rx_errors), -1 },
1260 	{ "tx_errors", DEV_STAT(tx_errors), -1 },
1261 	{ "rx_dropped",	DEV_STAT(rx_dropped), -1 },
1262 	{ "tx_dropped",	DEV_STAT(tx_dropped), -1 },
1263 
1264 	{ "rx_good_octets", GEN_STAT(mib.rx_gd_octets), ETH_MIB_RX_GD_OCTETS},
1265 	{ "rx_good_pkts", GEN_STAT(mib.rx_gd_pkts), ETH_MIB_RX_GD_PKTS },
1266 	{ "rx_broadcast", GEN_STAT(mib.rx_brdcast), ETH_MIB_RX_BRDCAST },
1267 	{ "rx_multicast", GEN_STAT(mib.rx_mult), ETH_MIB_RX_MULT },
1268 	{ "rx_64_octets", GEN_STAT(mib.rx_64), ETH_MIB_RX_64 },
1269 	{ "rx_65_127_oct", GEN_STAT(mib.rx_65_127), ETH_MIB_RX_65_127 },
1270 	{ "rx_128_255_oct", GEN_STAT(mib.rx_128_255), ETH_MIB_RX_128_255 },
1271 	{ "rx_256_511_oct", GEN_STAT(mib.rx_256_511), ETH_MIB_RX_256_511 },
1272 	{ "rx_512_1023_oct", GEN_STAT(mib.rx_512_1023), ETH_MIB_RX_512_1023 },
1273 	{ "rx_1024_max_oct", GEN_STAT(mib.rx_1024_max), ETH_MIB_RX_1024_MAX },
1274 	{ "rx_jabber", GEN_STAT(mib.rx_jab), ETH_MIB_RX_JAB },
1275 	{ "rx_oversize", GEN_STAT(mib.rx_ovr), ETH_MIB_RX_OVR },
1276 	{ "rx_fragment", GEN_STAT(mib.rx_frag), ETH_MIB_RX_FRAG },
1277 	{ "rx_dropped",	GEN_STAT(mib.rx_drop), ETH_MIB_RX_DROP },
1278 	{ "rx_crc_align", GEN_STAT(mib.rx_crc_align), ETH_MIB_RX_CRC_ALIGN },
1279 	{ "rx_undersize", GEN_STAT(mib.rx_und), ETH_MIB_RX_UND },
1280 	{ "rx_crc", GEN_STAT(mib.rx_crc), ETH_MIB_RX_CRC },
1281 	{ "rx_align", GEN_STAT(mib.rx_align), ETH_MIB_RX_ALIGN },
1282 	{ "rx_symbol_error", GEN_STAT(mib.rx_sym), ETH_MIB_RX_SYM },
1283 	{ "rx_pause", GEN_STAT(mib.rx_pause), ETH_MIB_RX_PAUSE },
1284 	{ "rx_control", GEN_STAT(mib.rx_cntrl), ETH_MIB_RX_CNTRL },
1285 
1286 	{ "tx_good_octets", GEN_STAT(mib.tx_gd_octets), ETH_MIB_TX_GD_OCTETS },
1287 	{ "tx_good_pkts", GEN_STAT(mib.tx_gd_pkts), ETH_MIB_TX_GD_PKTS },
1288 	{ "tx_broadcast", GEN_STAT(mib.tx_brdcast), ETH_MIB_TX_BRDCAST },
1289 	{ "tx_multicast", GEN_STAT(mib.tx_mult), ETH_MIB_TX_MULT },
1290 	{ "tx_64_oct", GEN_STAT(mib.tx_64), ETH_MIB_TX_64 },
1291 	{ "tx_65_127_oct", GEN_STAT(mib.tx_65_127), ETH_MIB_TX_65_127 },
1292 	{ "tx_128_255_oct", GEN_STAT(mib.tx_128_255), ETH_MIB_TX_128_255 },
1293 	{ "tx_256_511_oct", GEN_STAT(mib.tx_256_511), ETH_MIB_TX_256_511 },
1294 	{ "tx_512_1023_oct", GEN_STAT(mib.tx_512_1023), ETH_MIB_TX_512_1023},
1295 	{ "tx_1024_max_oct", GEN_STAT(mib.tx_1024_max), ETH_MIB_TX_1024_MAX },
1296 	{ "tx_jabber", GEN_STAT(mib.tx_jab), ETH_MIB_TX_JAB },
1297 	{ "tx_oversize", GEN_STAT(mib.tx_ovr), ETH_MIB_TX_OVR },
1298 	{ "tx_fragment", GEN_STAT(mib.tx_frag), ETH_MIB_TX_FRAG },
1299 	{ "tx_underrun", GEN_STAT(mib.tx_underrun), ETH_MIB_TX_UNDERRUN },
1300 	{ "tx_collisions", GEN_STAT(mib.tx_col), ETH_MIB_TX_COL },
1301 	{ "tx_single_collision", GEN_STAT(mib.tx_1_col), ETH_MIB_TX_1_COL },
1302 	{ "tx_multiple_collision", GEN_STAT(mib.tx_m_col), ETH_MIB_TX_M_COL },
1303 	{ "tx_excess_collision", GEN_STAT(mib.tx_ex_col), ETH_MIB_TX_EX_COL },
1304 	{ "tx_late_collision", GEN_STAT(mib.tx_late), ETH_MIB_TX_LATE },
1305 	{ "tx_deferred", GEN_STAT(mib.tx_def), ETH_MIB_TX_DEF },
1306 	{ "tx_carrier_sense", GEN_STAT(mib.tx_crs), ETH_MIB_TX_CRS },
1307 	{ "tx_pause", GEN_STAT(mib.tx_pause), ETH_MIB_TX_PAUSE },
1308 
1309 };
1310 
1311 #define BCM_ENET_STATS_LEN	ARRAY_SIZE(bcm_enet_gstrings_stats)
1312 
1313 static const u32 unused_mib_regs[] = {
1314 	ETH_MIB_TX_ALL_OCTETS,
1315 	ETH_MIB_TX_ALL_PKTS,
1316 	ETH_MIB_RX_ALL_OCTETS,
1317 	ETH_MIB_RX_ALL_PKTS,
1318 };
1319 
1320 
1321 static void bcm_enet_get_drvinfo(struct net_device *netdev,
1322 				 struct ethtool_drvinfo *drvinfo)
1323 {
1324 	strscpy(drvinfo->driver, bcm_enet_driver_name, sizeof(drvinfo->driver));
1325 	strscpy(drvinfo->bus_info, "bcm63xx", sizeof(drvinfo->bus_info));
1326 }
1327 
1328 static int bcm_enet_get_sset_count(struct net_device *netdev,
1329 					int string_set)
1330 {
1331 	switch (string_set) {
1332 	case ETH_SS_STATS:
1333 		return BCM_ENET_STATS_LEN;
1334 	default:
1335 		return -EINVAL;
1336 	}
1337 }
1338 
1339 static void bcm_enet_get_strings(struct net_device *netdev,
1340 				 u32 stringset, u8 *data)
1341 {
1342 	int i;
1343 
1344 	switch (stringset) {
1345 	case ETH_SS_STATS:
1346 		for (i = 0; i < BCM_ENET_STATS_LEN; i++) {
1347 			memcpy(data + i * ETH_GSTRING_LEN,
1348 			       bcm_enet_gstrings_stats[i].stat_string,
1349 			       ETH_GSTRING_LEN);
1350 		}
1351 		break;
1352 	}
1353 }
1354 
1355 static void update_mib_counters(struct bcm_enet_priv *priv)
1356 {
1357 	int i;
1358 
1359 	for (i = 0; i < BCM_ENET_STATS_LEN; i++) {
1360 		const struct bcm_enet_stats *s;
1361 		u32 val;
1362 		char *p;
1363 
1364 		s = &bcm_enet_gstrings_stats[i];
1365 		if (s->mib_reg == -1)
1366 			continue;
1367 
1368 		val = enet_readl(priv, ENET_MIB_REG(s->mib_reg));
1369 		p = (char *)priv + s->stat_offset;
1370 
1371 		if (s->sizeof_stat == sizeof(u64))
1372 			*(u64 *)p += val;
1373 		else
1374 			*(u32 *)p += val;
1375 	}
1376 
1377 	/* also empty unused mib counters to make sure mib counter
1378 	 * overflow interrupt is cleared */
1379 	for (i = 0; i < ARRAY_SIZE(unused_mib_regs); i++)
1380 		(void)enet_readl(priv, ENET_MIB_REG(unused_mib_regs[i]));
1381 }
1382 
1383 static void bcm_enet_update_mib_counters_defer(struct work_struct *t)
1384 {
1385 	struct bcm_enet_priv *priv;
1386 
1387 	priv = container_of(t, struct bcm_enet_priv, mib_update_task);
1388 	mutex_lock(&priv->mib_update_lock);
1389 	update_mib_counters(priv);
1390 	mutex_unlock(&priv->mib_update_lock);
1391 
1392 	/* reenable mib interrupt */
1393 	if (netif_running(priv->net_dev))
1394 		enet_writel(priv, ENET_IR_MIB, ENET_IRMASK_REG);
1395 }
1396 
1397 static void bcm_enet_get_ethtool_stats(struct net_device *netdev,
1398 				       struct ethtool_stats *stats,
1399 				       u64 *data)
1400 {
1401 	struct bcm_enet_priv *priv;
1402 	int i;
1403 
1404 	priv = netdev_priv(netdev);
1405 
1406 	mutex_lock(&priv->mib_update_lock);
1407 	update_mib_counters(priv);
1408 
1409 	for (i = 0; i < BCM_ENET_STATS_LEN; i++) {
1410 		const struct bcm_enet_stats *s;
1411 		char *p;
1412 
1413 		s = &bcm_enet_gstrings_stats[i];
1414 		if (s->mib_reg == -1)
1415 			p = (char *)&netdev->stats;
1416 		else
1417 			p = (char *)priv;
1418 		p += s->stat_offset;
1419 		data[i] = (s->sizeof_stat == sizeof(u64)) ?
1420 			*(u64 *)p : *(u32 *)p;
1421 	}
1422 	mutex_unlock(&priv->mib_update_lock);
1423 }
1424 
1425 static int bcm_enet_nway_reset(struct net_device *dev)
1426 {
1427 	struct bcm_enet_priv *priv;
1428 
1429 	priv = netdev_priv(dev);
1430 	if (priv->has_phy)
1431 		return phy_ethtool_nway_reset(dev);
1432 
1433 	return -EOPNOTSUPP;
1434 }
1435 
1436 static int bcm_enet_get_link_ksettings(struct net_device *dev,
1437 				       struct ethtool_link_ksettings *cmd)
1438 {
1439 	struct bcm_enet_priv *priv;
1440 	u32 supported, advertising;
1441 
1442 	priv = netdev_priv(dev);
1443 
1444 	if (priv->has_phy) {
1445 		if (!dev->phydev)
1446 			return -ENODEV;
1447 
1448 		phy_ethtool_ksettings_get(dev->phydev, cmd);
1449 
1450 		return 0;
1451 	} else {
1452 		cmd->base.autoneg = 0;
1453 		cmd->base.speed = (priv->force_speed_100) ?
1454 			SPEED_100 : SPEED_10;
1455 		cmd->base.duplex = (priv->force_duplex_full) ?
1456 			DUPLEX_FULL : DUPLEX_HALF;
1457 		supported = ADVERTISED_10baseT_Half |
1458 			ADVERTISED_10baseT_Full |
1459 			ADVERTISED_100baseT_Half |
1460 			ADVERTISED_100baseT_Full;
1461 		advertising = 0;
1462 		ethtool_convert_legacy_u32_to_link_mode(
1463 			cmd->link_modes.supported, supported);
1464 		ethtool_convert_legacy_u32_to_link_mode(
1465 			cmd->link_modes.advertising, advertising);
1466 		cmd->base.port = PORT_MII;
1467 	}
1468 	return 0;
1469 }
1470 
1471 static int bcm_enet_set_link_ksettings(struct net_device *dev,
1472 				       const struct ethtool_link_ksettings *cmd)
1473 {
1474 	struct bcm_enet_priv *priv;
1475 
1476 	priv = netdev_priv(dev);
1477 	if (priv->has_phy) {
1478 		if (!dev->phydev)
1479 			return -ENODEV;
1480 		return phy_ethtool_ksettings_set(dev->phydev, cmd);
1481 	} else {
1482 
1483 		if (cmd->base.autoneg ||
1484 		    (cmd->base.speed != SPEED_100 &&
1485 		     cmd->base.speed != SPEED_10) ||
1486 		    cmd->base.port != PORT_MII)
1487 			return -EINVAL;
1488 
1489 		priv->force_speed_100 =
1490 			(cmd->base.speed == SPEED_100) ? 1 : 0;
1491 		priv->force_duplex_full =
1492 			(cmd->base.duplex == DUPLEX_FULL) ? 1 : 0;
1493 
1494 		if (netif_running(dev))
1495 			bcm_enet_adjust_link(dev);
1496 		return 0;
1497 	}
1498 }
1499 
1500 static void
1501 bcm_enet_get_ringparam(struct net_device *dev,
1502 		       struct ethtool_ringparam *ering,
1503 		       struct kernel_ethtool_ringparam *kernel_ering,
1504 		       struct netlink_ext_ack *extack)
1505 {
1506 	struct bcm_enet_priv *priv;
1507 
1508 	priv = netdev_priv(dev);
1509 
1510 	/* rx/tx ring is actually only limited by memory */
1511 	ering->rx_max_pending = 8192;
1512 	ering->tx_max_pending = 8192;
1513 	ering->rx_pending = priv->rx_ring_size;
1514 	ering->tx_pending = priv->tx_ring_size;
1515 }
1516 
1517 static int bcm_enet_set_ringparam(struct net_device *dev,
1518 				  struct ethtool_ringparam *ering,
1519 				  struct kernel_ethtool_ringparam *kernel_ering,
1520 				  struct netlink_ext_ack *extack)
1521 {
1522 	struct bcm_enet_priv *priv;
1523 	int was_running;
1524 
1525 	priv = netdev_priv(dev);
1526 
1527 	was_running = 0;
1528 	if (netif_running(dev)) {
1529 		bcm_enet_stop(dev);
1530 		was_running = 1;
1531 	}
1532 
1533 	priv->rx_ring_size = ering->rx_pending;
1534 	priv->tx_ring_size = ering->tx_pending;
1535 
1536 	if (was_running) {
1537 		int err;
1538 
1539 		err = bcm_enet_open(dev);
1540 		if (err)
1541 			dev_close(dev);
1542 		else
1543 			bcm_enet_set_multicast_list(dev);
1544 	}
1545 	return 0;
1546 }
1547 
1548 static void bcm_enet_get_pauseparam(struct net_device *dev,
1549 				    struct ethtool_pauseparam *ecmd)
1550 {
1551 	struct bcm_enet_priv *priv;
1552 
1553 	priv = netdev_priv(dev);
1554 	ecmd->autoneg = priv->pause_auto;
1555 	ecmd->rx_pause = priv->pause_rx;
1556 	ecmd->tx_pause = priv->pause_tx;
1557 }
1558 
1559 static int bcm_enet_set_pauseparam(struct net_device *dev,
1560 				   struct ethtool_pauseparam *ecmd)
1561 {
1562 	struct bcm_enet_priv *priv;
1563 
1564 	priv = netdev_priv(dev);
1565 
1566 	if (priv->has_phy) {
1567 		if (ecmd->autoneg && (ecmd->rx_pause != ecmd->tx_pause)) {
1568 			/* asymetric pause mode not supported,
1569 			 * actually possible but integrated PHY has RO
1570 			 * asym_pause bit */
1571 			return -EINVAL;
1572 		}
1573 	} else {
1574 		/* no pause autoneg on direct mii connection */
1575 		if (ecmd->autoneg)
1576 			return -EINVAL;
1577 	}
1578 
1579 	priv->pause_auto = ecmd->autoneg;
1580 	priv->pause_rx = ecmd->rx_pause;
1581 	priv->pause_tx = ecmd->tx_pause;
1582 
1583 	return 0;
1584 }
1585 
1586 static const struct ethtool_ops bcm_enet_ethtool_ops = {
1587 	.get_strings		= bcm_enet_get_strings,
1588 	.get_sset_count		= bcm_enet_get_sset_count,
1589 	.get_ethtool_stats      = bcm_enet_get_ethtool_stats,
1590 	.nway_reset		= bcm_enet_nway_reset,
1591 	.get_drvinfo		= bcm_enet_get_drvinfo,
1592 	.get_link		= ethtool_op_get_link,
1593 	.get_ringparam		= bcm_enet_get_ringparam,
1594 	.set_ringparam		= bcm_enet_set_ringparam,
1595 	.get_pauseparam		= bcm_enet_get_pauseparam,
1596 	.set_pauseparam		= bcm_enet_set_pauseparam,
1597 	.get_link_ksettings	= bcm_enet_get_link_ksettings,
1598 	.set_link_ksettings	= bcm_enet_set_link_ksettings,
1599 };
1600 
1601 static int bcm_enet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1602 {
1603 	struct bcm_enet_priv *priv;
1604 
1605 	priv = netdev_priv(dev);
1606 	if (priv->has_phy) {
1607 		if (!dev->phydev)
1608 			return -ENODEV;
1609 		return phy_mii_ioctl(dev->phydev, rq, cmd);
1610 	} else {
1611 		struct mii_if_info mii;
1612 
1613 		mii.dev = dev;
1614 		mii.mdio_read = bcm_enet_mdio_read_mii;
1615 		mii.mdio_write = bcm_enet_mdio_write_mii;
1616 		mii.phy_id = 0;
1617 		mii.phy_id_mask = 0x3f;
1618 		mii.reg_num_mask = 0x1f;
1619 		return generic_mii_ioctl(&mii, if_mii(rq), cmd, NULL);
1620 	}
1621 }
1622 
1623 /*
1624  * adjust mtu, can't be called while device is running
1625  */
1626 static int bcm_enet_change_mtu(struct net_device *dev, int new_mtu)
1627 {
1628 	struct bcm_enet_priv *priv = netdev_priv(dev);
1629 	int actual_mtu = new_mtu;
1630 
1631 	if (netif_running(dev))
1632 		return -EBUSY;
1633 
1634 	/* add ethernet header + vlan tag size */
1635 	actual_mtu += VLAN_ETH_HLEN;
1636 
1637 	/*
1638 	 * setup maximum size before we get overflow mark in
1639 	 * descriptor, note that this will not prevent reception of
1640 	 * big frames, they will be split into multiple buffers
1641 	 * anyway
1642 	 */
1643 	priv->hw_mtu = actual_mtu;
1644 
1645 	/*
1646 	 * align rx buffer size to dma burst len, account FCS since
1647 	 * it's appended
1648 	 */
1649 	priv->rx_buf_size = ALIGN(actual_mtu + ETH_FCS_LEN,
1650 				  priv->dma_maxburst * 4);
1651 
1652 	priv->rx_frag_size = SKB_DATA_ALIGN(priv->rx_buf_offset + priv->rx_buf_size) +
1653 					    SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1654 
1655 	dev->mtu = new_mtu;
1656 	return 0;
1657 }
1658 
1659 /*
1660  * preinit hardware to allow mii operation while device is down
1661  */
1662 static void bcm_enet_hw_preinit(struct bcm_enet_priv *priv)
1663 {
1664 	u32 val;
1665 	int limit;
1666 
1667 	/* make sure mac is disabled */
1668 	bcm_enet_disable_mac(priv);
1669 
1670 	/* soft reset mac */
1671 	val = ENET_CTL_SRESET_MASK;
1672 	enet_writel(priv, val, ENET_CTL_REG);
1673 	wmb();
1674 
1675 	limit = 1000;
1676 	do {
1677 		val = enet_readl(priv, ENET_CTL_REG);
1678 		if (!(val & ENET_CTL_SRESET_MASK))
1679 			break;
1680 		udelay(1);
1681 	} while (limit--);
1682 
1683 	/* select correct mii interface */
1684 	val = enet_readl(priv, ENET_CTL_REG);
1685 	if (priv->use_external_mii)
1686 		val |= ENET_CTL_EPHYSEL_MASK;
1687 	else
1688 		val &= ~ENET_CTL_EPHYSEL_MASK;
1689 	enet_writel(priv, val, ENET_CTL_REG);
1690 
1691 	/* turn on mdc clock */
1692 	enet_writel(priv, (0x1f << ENET_MIISC_MDCFREQDIV_SHIFT) |
1693 		    ENET_MIISC_PREAMBLEEN_MASK, ENET_MIISC_REG);
1694 
1695 	/* set mib counters to self-clear when read */
1696 	val = enet_readl(priv, ENET_MIBCTL_REG);
1697 	val |= ENET_MIBCTL_RDCLEAR_MASK;
1698 	enet_writel(priv, val, ENET_MIBCTL_REG);
1699 }
1700 
1701 static const struct net_device_ops bcm_enet_ops = {
1702 	.ndo_open		= bcm_enet_open,
1703 	.ndo_stop		= bcm_enet_stop,
1704 	.ndo_start_xmit		= bcm_enet_start_xmit,
1705 	.ndo_set_mac_address	= bcm_enet_set_mac_address,
1706 	.ndo_set_rx_mode	= bcm_enet_set_multicast_list,
1707 	.ndo_eth_ioctl		= bcm_enet_ioctl,
1708 	.ndo_change_mtu		= bcm_enet_change_mtu,
1709 };
1710 
1711 /*
1712  * allocate netdevice, request register memory and register device.
1713  */
1714 static int bcm_enet_probe(struct platform_device *pdev)
1715 {
1716 	struct bcm_enet_priv *priv;
1717 	struct net_device *dev;
1718 	struct bcm63xx_enet_platform_data *pd;
1719 	int irq, irq_rx, irq_tx;
1720 	struct mii_bus *bus;
1721 	int i, ret;
1722 
1723 	if (!bcm_enet_shared_base[0])
1724 		return -EPROBE_DEFER;
1725 
1726 	irq = platform_get_irq(pdev, 0);
1727 	irq_rx = platform_get_irq(pdev, 1);
1728 	irq_tx = platform_get_irq(pdev, 2);
1729 	if (irq < 0 || irq_rx < 0 || irq_tx < 0)
1730 		return -ENODEV;
1731 
1732 	dev = alloc_etherdev(sizeof(*priv));
1733 	if (!dev)
1734 		return -ENOMEM;
1735 	priv = netdev_priv(dev);
1736 
1737 	priv->enet_is_sw = false;
1738 	priv->dma_maxburst = BCMENET_DMA_MAXBURST;
1739 	priv->rx_buf_offset = NET_SKB_PAD;
1740 
1741 	ret = bcm_enet_change_mtu(dev, dev->mtu);
1742 	if (ret)
1743 		goto out;
1744 
1745 	priv->base = devm_platform_ioremap_resource(pdev, 0);
1746 	if (IS_ERR(priv->base)) {
1747 		ret = PTR_ERR(priv->base);
1748 		goto out;
1749 	}
1750 
1751 	dev->irq = priv->irq = irq;
1752 	priv->irq_rx = irq_rx;
1753 	priv->irq_tx = irq_tx;
1754 
1755 	priv->mac_clk = devm_clk_get(&pdev->dev, "enet");
1756 	if (IS_ERR(priv->mac_clk)) {
1757 		ret = PTR_ERR(priv->mac_clk);
1758 		goto out;
1759 	}
1760 	ret = clk_prepare_enable(priv->mac_clk);
1761 	if (ret)
1762 		goto out;
1763 
1764 	/* initialize default and fetch platform data */
1765 	priv->rx_ring_size = BCMENET_DEF_RX_DESC;
1766 	priv->tx_ring_size = BCMENET_DEF_TX_DESC;
1767 
1768 	pd = dev_get_platdata(&pdev->dev);
1769 	if (pd) {
1770 		eth_hw_addr_set(dev, pd->mac_addr);
1771 		priv->has_phy = pd->has_phy;
1772 		priv->phy_id = pd->phy_id;
1773 		priv->has_phy_interrupt = pd->has_phy_interrupt;
1774 		priv->phy_interrupt = pd->phy_interrupt;
1775 		priv->use_external_mii = !pd->use_internal_phy;
1776 		priv->pause_auto = pd->pause_auto;
1777 		priv->pause_rx = pd->pause_rx;
1778 		priv->pause_tx = pd->pause_tx;
1779 		priv->force_duplex_full = pd->force_duplex_full;
1780 		priv->force_speed_100 = pd->force_speed_100;
1781 		priv->dma_chan_en_mask = pd->dma_chan_en_mask;
1782 		priv->dma_chan_int_mask = pd->dma_chan_int_mask;
1783 		priv->dma_chan_width = pd->dma_chan_width;
1784 		priv->dma_has_sram = pd->dma_has_sram;
1785 		priv->dma_desc_shift = pd->dma_desc_shift;
1786 		priv->rx_chan = pd->rx_chan;
1787 		priv->tx_chan = pd->tx_chan;
1788 	}
1789 
1790 	if (priv->has_phy && !priv->use_external_mii) {
1791 		/* using internal PHY, enable clock */
1792 		priv->phy_clk = devm_clk_get(&pdev->dev, "ephy");
1793 		if (IS_ERR(priv->phy_clk)) {
1794 			ret = PTR_ERR(priv->phy_clk);
1795 			priv->phy_clk = NULL;
1796 			goto out_disable_clk_mac;
1797 		}
1798 		ret = clk_prepare_enable(priv->phy_clk);
1799 		if (ret)
1800 			goto out_disable_clk_mac;
1801 	}
1802 
1803 	/* do minimal hardware init to be able to probe mii bus */
1804 	bcm_enet_hw_preinit(priv);
1805 
1806 	/* MII bus registration */
1807 	if (priv->has_phy) {
1808 
1809 		priv->mii_bus = mdiobus_alloc();
1810 		if (!priv->mii_bus) {
1811 			ret = -ENOMEM;
1812 			goto out_uninit_hw;
1813 		}
1814 
1815 		bus = priv->mii_bus;
1816 		bus->name = "bcm63xx_enet MII bus";
1817 		bus->parent = &pdev->dev;
1818 		bus->priv = priv;
1819 		bus->read = bcm_enet_mdio_read_phylib;
1820 		bus->write = bcm_enet_mdio_write_phylib;
1821 		sprintf(bus->id, "%s-%d", pdev->name, pdev->id);
1822 
1823 		/* only probe bus where we think the PHY is, because
1824 		 * the mdio read operation return 0 instead of 0xffff
1825 		 * if a slave is not present on hw */
1826 		bus->phy_mask = ~(1 << priv->phy_id);
1827 
1828 		if (priv->has_phy_interrupt)
1829 			bus->irq[priv->phy_id] = priv->phy_interrupt;
1830 
1831 		ret = mdiobus_register(bus);
1832 		if (ret) {
1833 			dev_err(&pdev->dev, "unable to register mdio bus\n");
1834 			goto out_free_mdio;
1835 		}
1836 	} else {
1837 
1838 		/* run platform code to initialize PHY device */
1839 		if (pd && pd->mii_config &&
1840 		    pd->mii_config(dev, 1, bcm_enet_mdio_read_mii,
1841 				   bcm_enet_mdio_write_mii)) {
1842 			dev_err(&pdev->dev, "unable to configure mdio bus\n");
1843 			goto out_uninit_hw;
1844 		}
1845 	}
1846 
1847 	spin_lock_init(&priv->rx_lock);
1848 
1849 	/* init rx timeout (used for oom) */
1850 	timer_setup(&priv->rx_timeout, bcm_enet_refill_rx_timer, 0);
1851 
1852 	/* init the mib update lock&work */
1853 	mutex_init(&priv->mib_update_lock);
1854 	INIT_WORK(&priv->mib_update_task, bcm_enet_update_mib_counters_defer);
1855 
1856 	/* zero mib counters */
1857 	for (i = 0; i < ENET_MIB_REG_COUNT; i++)
1858 		enet_writel(priv, 0, ENET_MIB_REG(i));
1859 
1860 	/* register netdevice */
1861 	dev->netdev_ops = &bcm_enet_ops;
1862 	netif_napi_add_weight(dev, &priv->napi, bcm_enet_poll, 16);
1863 
1864 	dev->ethtool_ops = &bcm_enet_ethtool_ops;
1865 	/* MTU range: 46 - 2028 */
1866 	dev->min_mtu = ETH_ZLEN - ETH_HLEN;
1867 	dev->max_mtu = BCMENET_MAX_MTU - VLAN_ETH_HLEN;
1868 	SET_NETDEV_DEV(dev, &pdev->dev);
1869 
1870 	ret = register_netdev(dev);
1871 	if (ret)
1872 		goto out_unregister_mdio;
1873 
1874 	netif_carrier_off(dev);
1875 	platform_set_drvdata(pdev, dev);
1876 	priv->pdev = pdev;
1877 	priv->net_dev = dev;
1878 
1879 	return 0;
1880 
1881 out_unregister_mdio:
1882 	if (priv->mii_bus)
1883 		mdiobus_unregister(priv->mii_bus);
1884 
1885 out_free_mdio:
1886 	if (priv->mii_bus)
1887 		mdiobus_free(priv->mii_bus);
1888 
1889 out_uninit_hw:
1890 	/* turn off mdc clock */
1891 	enet_writel(priv, 0, ENET_MIISC_REG);
1892 	clk_disable_unprepare(priv->phy_clk);
1893 
1894 out_disable_clk_mac:
1895 	clk_disable_unprepare(priv->mac_clk);
1896 out:
1897 	free_netdev(dev);
1898 	return ret;
1899 }
1900 
1901 
1902 /*
1903  * exit func, stops hardware and unregisters netdevice
1904  */
1905 static int bcm_enet_remove(struct platform_device *pdev)
1906 {
1907 	struct bcm_enet_priv *priv;
1908 	struct net_device *dev;
1909 
1910 	/* stop netdevice */
1911 	dev = platform_get_drvdata(pdev);
1912 	priv = netdev_priv(dev);
1913 	unregister_netdev(dev);
1914 
1915 	/* turn off mdc clock */
1916 	enet_writel(priv, 0, ENET_MIISC_REG);
1917 
1918 	if (priv->has_phy) {
1919 		mdiobus_unregister(priv->mii_bus);
1920 		mdiobus_free(priv->mii_bus);
1921 	} else {
1922 		struct bcm63xx_enet_platform_data *pd;
1923 
1924 		pd = dev_get_platdata(&pdev->dev);
1925 		if (pd && pd->mii_config)
1926 			pd->mii_config(dev, 0, bcm_enet_mdio_read_mii,
1927 				       bcm_enet_mdio_write_mii);
1928 	}
1929 
1930 	/* disable hw block clocks */
1931 	clk_disable_unprepare(priv->phy_clk);
1932 	clk_disable_unprepare(priv->mac_clk);
1933 
1934 	free_netdev(dev);
1935 	return 0;
1936 }
1937 
1938 static struct platform_driver bcm63xx_enet_driver = {
1939 	.probe	= bcm_enet_probe,
1940 	.remove	= bcm_enet_remove,
1941 	.driver	= {
1942 		.name	= "bcm63xx_enet",
1943 	},
1944 };
1945 
1946 /*
1947  * switch mii access callbacks
1948  */
1949 static int bcmenet_sw_mdio_read(struct bcm_enet_priv *priv,
1950 				int ext, int phy_id, int location)
1951 {
1952 	u32 reg;
1953 	int ret;
1954 
1955 	spin_lock_bh(&priv->enetsw_mdio_lock);
1956 	enetsw_writel(priv, 0, ENETSW_MDIOC_REG);
1957 
1958 	reg = ENETSW_MDIOC_RD_MASK |
1959 		(phy_id << ENETSW_MDIOC_PHYID_SHIFT) |
1960 		(location << ENETSW_MDIOC_REG_SHIFT);
1961 
1962 	if (ext)
1963 		reg |= ENETSW_MDIOC_EXT_MASK;
1964 
1965 	enetsw_writel(priv, reg, ENETSW_MDIOC_REG);
1966 	udelay(50);
1967 	ret = enetsw_readw(priv, ENETSW_MDIOD_REG);
1968 	spin_unlock_bh(&priv->enetsw_mdio_lock);
1969 	return ret;
1970 }
1971 
1972 static void bcmenet_sw_mdio_write(struct bcm_enet_priv *priv,
1973 				 int ext, int phy_id, int location,
1974 				 uint16_t data)
1975 {
1976 	u32 reg;
1977 
1978 	spin_lock_bh(&priv->enetsw_mdio_lock);
1979 	enetsw_writel(priv, 0, ENETSW_MDIOC_REG);
1980 
1981 	reg = ENETSW_MDIOC_WR_MASK |
1982 		(phy_id << ENETSW_MDIOC_PHYID_SHIFT) |
1983 		(location << ENETSW_MDIOC_REG_SHIFT);
1984 
1985 	if (ext)
1986 		reg |= ENETSW_MDIOC_EXT_MASK;
1987 
1988 	reg |= data;
1989 
1990 	enetsw_writel(priv, reg, ENETSW_MDIOC_REG);
1991 	udelay(50);
1992 	spin_unlock_bh(&priv->enetsw_mdio_lock);
1993 }
1994 
1995 static inline int bcm_enet_port_is_rgmii(int portid)
1996 {
1997 	return portid >= ENETSW_RGMII_PORT0;
1998 }
1999 
2000 /*
2001  * enet sw PHY polling
2002  */
2003 static void swphy_poll_timer(struct timer_list *t)
2004 {
2005 	struct bcm_enet_priv *priv = from_timer(priv, t, swphy_poll);
2006 	unsigned int i;
2007 
2008 	for (i = 0; i < priv->num_ports; i++) {
2009 		struct bcm63xx_enetsw_port *port;
2010 		int val, j, up, advertise, lpa, speed, duplex, media;
2011 		int external_phy = bcm_enet_port_is_rgmii(i);
2012 		u8 override;
2013 
2014 		port = &priv->used_ports[i];
2015 		if (!port->used)
2016 			continue;
2017 
2018 		if (port->bypass_link)
2019 			continue;
2020 
2021 		/* dummy read to clear */
2022 		for (j = 0; j < 2; j++)
2023 			val = bcmenet_sw_mdio_read(priv, external_phy,
2024 						   port->phy_id, MII_BMSR);
2025 
2026 		if (val == 0xffff)
2027 			continue;
2028 
2029 		up = (val & BMSR_LSTATUS) ? 1 : 0;
2030 		if (!(up ^ priv->sw_port_link[i]))
2031 			continue;
2032 
2033 		priv->sw_port_link[i] = up;
2034 
2035 		/* link changed */
2036 		if (!up) {
2037 			dev_info(&priv->pdev->dev, "link DOWN on %s\n",
2038 				 port->name);
2039 			enetsw_writeb(priv, ENETSW_PORTOV_ENABLE_MASK,
2040 				      ENETSW_PORTOV_REG(i));
2041 			enetsw_writeb(priv, ENETSW_PTCTRL_RXDIS_MASK |
2042 				      ENETSW_PTCTRL_TXDIS_MASK,
2043 				      ENETSW_PTCTRL_REG(i));
2044 			continue;
2045 		}
2046 
2047 		advertise = bcmenet_sw_mdio_read(priv, external_phy,
2048 						 port->phy_id, MII_ADVERTISE);
2049 
2050 		lpa = bcmenet_sw_mdio_read(priv, external_phy, port->phy_id,
2051 					   MII_LPA);
2052 
2053 		/* figure out media and duplex from advertise and LPA values */
2054 		media = mii_nway_result(lpa & advertise);
2055 		duplex = (media & ADVERTISE_FULL) ? 1 : 0;
2056 
2057 		if (media & (ADVERTISE_100FULL | ADVERTISE_100HALF))
2058 			speed = 100;
2059 		else
2060 			speed = 10;
2061 
2062 		if (val & BMSR_ESTATEN) {
2063 			advertise = bcmenet_sw_mdio_read(priv, external_phy,
2064 						port->phy_id, MII_CTRL1000);
2065 
2066 			lpa = bcmenet_sw_mdio_read(priv, external_phy,
2067 						port->phy_id, MII_STAT1000);
2068 
2069 			if (advertise & (ADVERTISE_1000FULL | ADVERTISE_1000HALF)
2070 					&& lpa & (LPA_1000FULL | LPA_1000HALF)) {
2071 				speed = 1000;
2072 				duplex = (lpa & LPA_1000FULL);
2073 			}
2074 		}
2075 
2076 		dev_info(&priv->pdev->dev,
2077 			 "link UP on %s, %dMbps, %s-duplex\n",
2078 			 port->name, speed, duplex ? "full" : "half");
2079 
2080 		override = ENETSW_PORTOV_ENABLE_MASK |
2081 			ENETSW_PORTOV_LINKUP_MASK;
2082 
2083 		if (speed == 1000)
2084 			override |= ENETSW_IMPOV_1000_MASK;
2085 		else if (speed == 100)
2086 			override |= ENETSW_IMPOV_100_MASK;
2087 		if (duplex)
2088 			override |= ENETSW_IMPOV_FDX_MASK;
2089 
2090 		enetsw_writeb(priv, override, ENETSW_PORTOV_REG(i));
2091 		enetsw_writeb(priv, 0, ENETSW_PTCTRL_REG(i));
2092 	}
2093 
2094 	priv->swphy_poll.expires = jiffies + HZ;
2095 	add_timer(&priv->swphy_poll);
2096 }
2097 
2098 /*
2099  * open callback, allocate dma rings & buffers and start rx operation
2100  */
2101 static int bcm_enetsw_open(struct net_device *dev)
2102 {
2103 	struct bcm_enet_priv *priv;
2104 	struct device *kdev;
2105 	int i, ret;
2106 	unsigned int size;
2107 	void *p;
2108 	u32 val;
2109 
2110 	priv = netdev_priv(dev);
2111 	kdev = &priv->pdev->dev;
2112 
2113 	/* mask all interrupts and request them */
2114 	enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->rx_chan);
2115 	enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->tx_chan);
2116 
2117 	ret = request_irq(priv->irq_rx, bcm_enet_isr_dma,
2118 			  0, dev->name, dev);
2119 	if (ret)
2120 		goto out_freeirq;
2121 
2122 	if (priv->irq_tx != -1) {
2123 		ret = request_irq(priv->irq_tx, bcm_enet_isr_dma,
2124 				  0, dev->name, dev);
2125 		if (ret)
2126 			goto out_freeirq_rx;
2127 	}
2128 
2129 	/* allocate rx dma ring */
2130 	size = priv->rx_ring_size * sizeof(struct bcm_enet_desc);
2131 	p = dma_alloc_coherent(kdev, size, &priv->rx_desc_dma, GFP_KERNEL);
2132 	if (!p) {
2133 		dev_err(kdev, "cannot allocate rx ring %u\n", size);
2134 		ret = -ENOMEM;
2135 		goto out_freeirq_tx;
2136 	}
2137 
2138 	priv->rx_desc_alloc_size = size;
2139 	priv->rx_desc_cpu = p;
2140 
2141 	/* allocate tx dma ring */
2142 	size = priv->tx_ring_size * sizeof(struct bcm_enet_desc);
2143 	p = dma_alloc_coherent(kdev, size, &priv->tx_desc_dma, GFP_KERNEL);
2144 	if (!p) {
2145 		dev_err(kdev, "cannot allocate tx ring\n");
2146 		ret = -ENOMEM;
2147 		goto out_free_rx_ring;
2148 	}
2149 
2150 	priv->tx_desc_alloc_size = size;
2151 	priv->tx_desc_cpu = p;
2152 
2153 	priv->tx_skb = kcalloc(priv->tx_ring_size, sizeof(struct sk_buff *),
2154 			       GFP_KERNEL);
2155 	if (!priv->tx_skb) {
2156 		dev_err(kdev, "cannot allocate tx skb queue\n");
2157 		ret = -ENOMEM;
2158 		goto out_free_tx_ring;
2159 	}
2160 
2161 	priv->tx_desc_count = priv->tx_ring_size;
2162 	priv->tx_dirty_desc = 0;
2163 	priv->tx_curr_desc = 0;
2164 	spin_lock_init(&priv->tx_lock);
2165 
2166 	/* init & fill rx ring with buffers */
2167 	priv->rx_buf = kcalloc(priv->rx_ring_size, sizeof(void *),
2168 			       GFP_KERNEL);
2169 	if (!priv->rx_buf) {
2170 		dev_err(kdev, "cannot allocate rx buffer queue\n");
2171 		ret = -ENOMEM;
2172 		goto out_free_tx_skb;
2173 	}
2174 
2175 	priv->rx_desc_count = 0;
2176 	priv->rx_dirty_desc = 0;
2177 	priv->rx_curr_desc = 0;
2178 
2179 	/* disable all ports */
2180 	for (i = 0; i < priv->num_ports; i++) {
2181 		enetsw_writeb(priv, ENETSW_PORTOV_ENABLE_MASK,
2182 			      ENETSW_PORTOV_REG(i));
2183 		enetsw_writeb(priv, ENETSW_PTCTRL_RXDIS_MASK |
2184 			      ENETSW_PTCTRL_TXDIS_MASK,
2185 			      ENETSW_PTCTRL_REG(i));
2186 
2187 		priv->sw_port_link[i] = 0;
2188 	}
2189 
2190 	/* reset mib */
2191 	val = enetsw_readb(priv, ENETSW_GMCR_REG);
2192 	val |= ENETSW_GMCR_RST_MIB_MASK;
2193 	enetsw_writeb(priv, val, ENETSW_GMCR_REG);
2194 	mdelay(1);
2195 	val &= ~ENETSW_GMCR_RST_MIB_MASK;
2196 	enetsw_writeb(priv, val, ENETSW_GMCR_REG);
2197 	mdelay(1);
2198 
2199 	/* force CPU port state */
2200 	val = enetsw_readb(priv, ENETSW_IMPOV_REG);
2201 	val |= ENETSW_IMPOV_FORCE_MASK | ENETSW_IMPOV_LINKUP_MASK;
2202 	enetsw_writeb(priv, val, ENETSW_IMPOV_REG);
2203 
2204 	/* enable switch forward engine */
2205 	val = enetsw_readb(priv, ENETSW_SWMODE_REG);
2206 	val |= ENETSW_SWMODE_FWD_EN_MASK;
2207 	enetsw_writeb(priv, val, ENETSW_SWMODE_REG);
2208 
2209 	/* enable jumbo on all ports */
2210 	enetsw_writel(priv, 0x1ff, ENETSW_JMBCTL_PORT_REG);
2211 	enetsw_writew(priv, 9728, ENETSW_JMBCTL_MAXSIZE_REG);
2212 
2213 	/* initialize flow control buffer allocation */
2214 	enet_dma_writel(priv, ENETDMA_BUFALLOC_FORCE_MASK | 0,
2215 			ENETDMA_BUFALLOC_REG(priv->rx_chan));
2216 
2217 	if (bcm_enet_refill_rx(dev, false)) {
2218 		dev_err(kdev, "cannot allocate rx buffer queue\n");
2219 		ret = -ENOMEM;
2220 		goto out;
2221 	}
2222 
2223 	/* write rx & tx ring addresses */
2224 	enet_dmas_writel(priv, priv->rx_desc_dma,
2225 			 ENETDMAS_RSTART_REG, priv->rx_chan);
2226 	enet_dmas_writel(priv, priv->tx_desc_dma,
2227 			 ENETDMAS_RSTART_REG, priv->tx_chan);
2228 
2229 	/* clear remaining state ram for rx & tx channel */
2230 	enet_dmas_writel(priv, 0, ENETDMAS_SRAM2_REG, priv->rx_chan);
2231 	enet_dmas_writel(priv, 0, ENETDMAS_SRAM2_REG, priv->tx_chan);
2232 	enet_dmas_writel(priv, 0, ENETDMAS_SRAM3_REG, priv->rx_chan);
2233 	enet_dmas_writel(priv, 0, ENETDMAS_SRAM3_REG, priv->tx_chan);
2234 	enet_dmas_writel(priv, 0, ENETDMAS_SRAM4_REG, priv->rx_chan);
2235 	enet_dmas_writel(priv, 0, ENETDMAS_SRAM4_REG, priv->tx_chan);
2236 
2237 	/* set dma maximum burst len */
2238 	enet_dmac_writel(priv, priv->dma_maxburst,
2239 			 ENETDMAC_MAXBURST, priv->rx_chan);
2240 	enet_dmac_writel(priv, priv->dma_maxburst,
2241 			 ENETDMAC_MAXBURST, priv->tx_chan);
2242 
2243 	/* set flow control low/high threshold to 1/3 / 2/3 */
2244 	val = priv->rx_ring_size / 3;
2245 	enet_dma_writel(priv, val, ENETDMA_FLOWCL_REG(priv->rx_chan));
2246 	val = (priv->rx_ring_size * 2) / 3;
2247 	enet_dma_writel(priv, val, ENETDMA_FLOWCH_REG(priv->rx_chan));
2248 
2249 	/* all set, enable mac and interrupts, start dma engine and
2250 	 * kick rx dma channel
2251 	 */
2252 	wmb();
2253 	enet_dma_writel(priv, ENETDMA_CFG_EN_MASK, ENETDMA_CFG_REG);
2254 	enet_dmac_writel(priv, ENETDMAC_CHANCFG_EN_MASK,
2255 			 ENETDMAC_CHANCFG, priv->rx_chan);
2256 
2257 	/* watch "packet transferred" interrupt in rx and tx */
2258 	enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
2259 			 ENETDMAC_IR, priv->rx_chan);
2260 	enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
2261 			 ENETDMAC_IR, priv->tx_chan);
2262 
2263 	/* make sure we enable napi before rx interrupt  */
2264 	napi_enable(&priv->napi);
2265 
2266 	enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
2267 			 ENETDMAC_IRMASK, priv->rx_chan);
2268 	enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
2269 			 ENETDMAC_IRMASK, priv->tx_chan);
2270 
2271 	netif_carrier_on(dev);
2272 	netif_start_queue(dev);
2273 
2274 	/* apply override config for bypass_link ports here. */
2275 	for (i = 0; i < priv->num_ports; i++) {
2276 		struct bcm63xx_enetsw_port *port;
2277 		u8 override;
2278 		port = &priv->used_ports[i];
2279 		if (!port->used)
2280 			continue;
2281 
2282 		if (!port->bypass_link)
2283 			continue;
2284 
2285 		override = ENETSW_PORTOV_ENABLE_MASK |
2286 			ENETSW_PORTOV_LINKUP_MASK;
2287 
2288 		switch (port->force_speed) {
2289 		case 1000:
2290 			override |= ENETSW_IMPOV_1000_MASK;
2291 			break;
2292 		case 100:
2293 			override |= ENETSW_IMPOV_100_MASK;
2294 			break;
2295 		case 10:
2296 			break;
2297 		default:
2298 			pr_warn("invalid forced speed on port %s: assume 10\n",
2299 			       port->name);
2300 			break;
2301 		}
2302 
2303 		if (port->force_duplex_full)
2304 			override |= ENETSW_IMPOV_FDX_MASK;
2305 
2306 
2307 		enetsw_writeb(priv, override, ENETSW_PORTOV_REG(i));
2308 		enetsw_writeb(priv, 0, ENETSW_PTCTRL_REG(i));
2309 	}
2310 
2311 	/* start phy polling timer */
2312 	timer_setup(&priv->swphy_poll, swphy_poll_timer, 0);
2313 	mod_timer(&priv->swphy_poll, jiffies);
2314 	return 0;
2315 
2316 out:
2317 	bcm_enet_free_rx_buf_ring(kdev, priv);
2318 
2319 out_free_tx_skb:
2320 	kfree(priv->tx_skb);
2321 
2322 out_free_tx_ring:
2323 	dma_free_coherent(kdev, priv->tx_desc_alloc_size,
2324 			  priv->tx_desc_cpu, priv->tx_desc_dma);
2325 
2326 out_free_rx_ring:
2327 	dma_free_coherent(kdev, priv->rx_desc_alloc_size,
2328 			  priv->rx_desc_cpu, priv->rx_desc_dma);
2329 
2330 out_freeirq_tx:
2331 	if (priv->irq_tx != -1)
2332 		free_irq(priv->irq_tx, dev);
2333 
2334 out_freeirq_rx:
2335 	free_irq(priv->irq_rx, dev);
2336 
2337 out_freeirq:
2338 	return ret;
2339 }
2340 
2341 /* stop callback */
2342 static int bcm_enetsw_stop(struct net_device *dev)
2343 {
2344 	struct bcm_enet_priv *priv;
2345 	struct device *kdev;
2346 
2347 	priv = netdev_priv(dev);
2348 	kdev = &priv->pdev->dev;
2349 
2350 	del_timer_sync(&priv->swphy_poll);
2351 	netif_stop_queue(dev);
2352 	napi_disable(&priv->napi);
2353 	del_timer_sync(&priv->rx_timeout);
2354 
2355 	/* mask all interrupts */
2356 	enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->rx_chan);
2357 	enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->tx_chan);
2358 
2359 	/* disable dma & mac */
2360 	bcm_enet_disable_dma(priv, priv->tx_chan);
2361 	bcm_enet_disable_dma(priv, priv->rx_chan);
2362 
2363 	/* force reclaim of all tx buffers */
2364 	bcm_enet_tx_reclaim(dev, 1, 0);
2365 
2366 	/* free the rx buffer ring */
2367 	bcm_enet_free_rx_buf_ring(kdev, priv);
2368 
2369 	/* free remaining allocated memory */
2370 	kfree(priv->tx_skb);
2371 	dma_free_coherent(kdev, priv->rx_desc_alloc_size,
2372 			  priv->rx_desc_cpu, priv->rx_desc_dma);
2373 	dma_free_coherent(kdev, priv->tx_desc_alloc_size,
2374 			  priv->tx_desc_cpu, priv->tx_desc_dma);
2375 	if (priv->irq_tx != -1)
2376 		free_irq(priv->irq_tx, dev);
2377 	free_irq(priv->irq_rx, dev);
2378 
2379 	/* reset BQL after forced tx reclaim to prevent kernel panic */
2380 	netdev_reset_queue(dev);
2381 
2382 	return 0;
2383 }
2384 
2385 /* try to sort out phy external status by walking the used_port field
2386  * in the bcm_enet_priv structure. in case the phy address is not
2387  * assigned to any physical port on the switch, assume it is external
2388  * (and yell at the user).
2389  */
2390 static int bcm_enetsw_phy_is_external(struct bcm_enet_priv *priv, int phy_id)
2391 {
2392 	int i;
2393 
2394 	for (i = 0; i < priv->num_ports; ++i) {
2395 		if (!priv->used_ports[i].used)
2396 			continue;
2397 		if (priv->used_ports[i].phy_id == phy_id)
2398 			return bcm_enet_port_is_rgmii(i);
2399 	}
2400 
2401 	printk_once(KERN_WARNING  "bcm63xx_enet: could not find a used port with phy_id %i, assuming phy is external\n",
2402 		    phy_id);
2403 	return 1;
2404 }
2405 
2406 /* can't use bcmenet_sw_mdio_read directly as we need to sort out
2407  * external/internal status of the given phy_id first.
2408  */
2409 static int bcm_enetsw_mii_mdio_read(struct net_device *dev, int phy_id,
2410 				    int location)
2411 {
2412 	struct bcm_enet_priv *priv;
2413 
2414 	priv = netdev_priv(dev);
2415 	return bcmenet_sw_mdio_read(priv,
2416 				    bcm_enetsw_phy_is_external(priv, phy_id),
2417 				    phy_id, location);
2418 }
2419 
2420 /* can't use bcmenet_sw_mdio_write directly as we need to sort out
2421  * external/internal status of the given phy_id first.
2422  */
2423 static void bcm_enetsw_mii_mdio_write(struct net_device *dev, int phy_id,
2424 				      int location,
2425 				      int val)
2426 {
2427 	struct bcm_enet_priv *priv;
2428 
2429 	priv = netdev_priv(dev);
2430 	bcmenet_sw_mdio_write(priv, bcm_enetsw_phy_is_external(priv, phy_id),
2431 			      phy_id, location, val);
2432 }
2433 
2434 static int bcm_enetsw_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
2435 {
2436 	struct mii_if_info mii;
2437 
2438 	mii.dev = dev;
2439 	mii.mdio_read = bcm_enetsw_mii_mdio_read;
2440 	mii.mdio_write = bcm_enetsw_mii_mdio_write;
2441 	mii.phy_id = 0;
2442 	mii.phy_id_mask = 0x3f;
2443 	mii.reg_num_mask = 0x1f;
2444 	return generic_mii_ioctl(&mii, if_mii(rq), cmd, NULL);
2445 
2446 }
2447 
2448 static const struct net_device_ops bcm_enetsw_ops = {
2449 	.ndo_open		= bcm_enetsw_open,
2450 	.ndo_stop		= bcm_enetsw_stop,
2451 	.ndo_start_xmit		= bcm_enet_start_xmit,
2452 	.ndo_change_mtu		= bcm_enet_change_mtu,
2453 	.ndo_eth_ioctl		= bcm_enetsw_ioctl,
2454 };
2455 
2456 
2457 static const struct bcm_enet_stats bcm_enetsw_gstrings_stats[] = {
2458 	{ "rx_packets", DEV_STAT(rx_packets), -1 },
2459 	{ "tx_packets",	DEV_STAT(tx_packets), -1 },
2460 	{ "rx_bytes", DEV_STAT(rx_bytes), -1 },
2461 	{ "tx_bytes", DEV_STAT(tx_bytes), -1 },
2462 	{ "rx_errors", DEV_STAT(rx_errors), -1 },
2463 	{ "tx_errors", DEV_STAT(tx_errors), -1 },
2464 	{ "rx_dropped",	DEV_STAT(rx_dropped), -1 },
2465 	{ "tx_dropped",	DEV_STAT(tx_dropped), -1 },
2466 
2467 	{ "tx_good_octets", GEN_STAT(mib.tx_gd_octets), ETHSW_MIB_RX_GD_OCT },
2468 	{ "tx_unicast", GEN_STAT(mib.tx_unicast), ETHSW_MIB_RX_BRDCAST },
2469 	{ "tx_broadcast", GEN_STAT(mib.tx_brdcast), ETHSW_MIB_RX_BRDCAST },
2470 	{ "tx_multicast", GEN_STAT(mib.tx_mult), ETHSW_MIB_RX_MULT },
2471 	{ "tx_64_octets", GEN_STAT(mib.tx_64), ETHSW_MIB_RX_64 },
2472 	{ "tx_65_127_oct", GEN_STAT(mib.tx_65_127), ETHSW_MIB_RX_65_127 },
2473 	{ "tx_128_255_oct", GEN_STAT(mib.tx_128_255), ETHSW_MIB_RX_128_255 },
2474 	{ "tx_256_511_oct", GEN_STAT(mib.tx_256_511), ETHSW_MIB_RX_256_511 },
2475 	{ "tx_512_1023_oct", GEN_STAT(mib.tx_512_1023), ETHSW_MIB_RX_512_1023},
2476 	{ "tx_1024_1522_oct", GEN_STAT(mib.tx_1024_max),
2477 	  ETHSW_MIB_RX_1024_1522 },
2478 	{ "tx_1523_2047_oct", GEN_STAT(mib.tx_1523_2047),
2479 	  ETHSW_MIB_RX_1523_2047 },
2480 	{ "tx_2048_4095_oct", GEN_STAT(mib.tx_2048_4095),
2481 	  ETHSW_MIB_RX_2048_4095 },
2482 	{ "tx_4096_8191_oct", GEN_STAT(mib.tx_4096_8191),
2483 	  ETHSW_MIB_RX_4096_8191 },
2484 	{ "tx_8192_9728_oct", GEN_STAT(mib.tx_8192_9728),
2485 	  ETHSW_MIB_RX_8192_9728 },
2486 	{ "tx_oversize", GEN_STAT(mib.tx_ovr), ETHSW_MIB_RX_OVR },
2487 	{ "tx_oversize_drop", GEN_STAT(mib.tx_ovr), ETHSW_MIB_RX_OVR_DISC },
2488 	{ "tx_dropped",	GEN_STAT(mib.tx_drop), ETHSW_MIB_RX_DROP },
2489 	{ "tx_undersize", GEN_STAT(mib.tx_underrun), ETHSW_MIB_RX_UND },
2490 	{ "tx_pause", GEN_STAT(mib.tx_pause), ETHSW_MIB_RX_PAUSE },
2491 
2492 	{ "rx_good_octets", GEN_STAT(mib.rx_gd_octets), ETHSW_MIB_TX_ALL_OCT },
2493 	{ "rx_broadcast", GEN_STAT(mib.rx_brdcast), ETHSW_MIB_TX_BRDCAST },
2494 	{ "rx_multicast", GEN_STAT(mib.rx_mult), ETHSW_MIB_TX_MULT },
2495 	{ "rx_unicast", GEN_STAT(mib.rx_unicast), ETHSW_MIB_TX_MULT },
2496 	{ "rx_pause", GEN_STAT(mib.rx_pause), ETHSW_MIB_TX_PAUSE },
2497 	{ "rx_dropped", GEN_STAT(mib.rx_drop), ETHSW_MIB_TX_DROP_PKTS },
2498 
2499 };
2500 
2501 #define BCM_ENETSW_STATS_LEN	\
2502 	(sizeof(bcm_enetsw_gstrings_stats) / sizeof(struct bcm_enet_stats))
2503 
2504 static void bcm_enetsw_get_strings(struct net_device *netdev,
2505 				   u32 stringset, u8 *data)
2506 {
2507 	int i;
2508 
2509 	switch (stringset) {
2510 	case ETH_SS_STATS:
2511 		for (i = 0; i < BCM_ENETSW_STATS_LEN; i++) {
2512 			memcpy(data + i * ETH_GSTRING_LEN,
2513 			       bcm_enetsw_gstrings_stats[i].stat_string,
2514 			       ETH_GSTRING_LEN);
2515 		}
2516 		break;
2517 	}
2518 }
2519 
2520 static int bcm_enetsw_get_sset_count(struct net_device *netdev,
2521 				     int string_set)
2522 {
2523 	switch (string_set) {
2524 	case ETH_SS_STATS:
2525 		return BCM_ENETSW_STATS_LEN;
2526 	default:
2527 		return -EINVAL;
2528 	}
2529 }
2530 
2531 static void bcm_enetsw_get_drvinfo(struct net_device *netdev,
2532 				   struct ethtool_drvinfo *drvinfo)
2533 {
2534 	strncpy(drvinfo->driver, bcm_enet_driver_name, sizeof(drvinfo->driver));
2535 	strncpy(drvinfo->bus_info, "bcm63xx", sizeof(drvinfo->bus_info));
2536 }
2537 
2538 static void bcm_enetsw_get_ethtool_stats(struct net_device *netdev,
2539 					 struct ethtool_stats *stats,
2540 					 u64 *data)
2541 {
2542 	struct bcm_enet_priv *priv;
2543 	int i;
2544 
2545 	priv = netdev_priv(netdev);
2546 
2547 	for (i = 0; i < BCM_ENETSW_STATS_LEN; i++) {
2548 		const struct bcm_enet_stats *s;
2549 		u32 lo, hi;
2550 		char *p;
2551 		int reg;
2552 
2553 		s = &bcm_enetsw_gstrings_stats[i];
2554 
2555 		reg = s->mib_reg;
2556 		if (reg == -1)
2557 			continue;
2558 
2559 		lo = enetsw_readl(priv, ENETSW_MIB_REG(reg));
2560 		p = (char *)priv + s->stat_offset;
2561 
2562 		if (s->sizeof_stat == sizeof(u64)) {
2563 			hi = enetsw_readl(priv, ENETSW_MIB_REG(reg + 1));
2564 			*(u64 *)p = ((u64)hi << 32 | lo);
2565 		} else {
2566 			*(u32 *)p = lo;
2567 		}
2568 	}
2569 
2570 	for (i = 0; i < BCM_ENETSW_STATS_LEN; i++) {
2571 		const struct bcm_enet_stats *s;
2572 		char *p;
2573 
2574 		s = &bcm_enetsw_gstrings_stats[i];
2575 
2576 		if (s->mib_reg == -1)
2577 			p = (char *)&netdev->stats + s->stat_offset;
2578 		else
2579 			p = (char *)priv + s->stat_offset;
2580 
2581 		data[i] = (s->sizeof_stat == sizeof(u64)) ?
2582 			*(u64 *)p : *(u32 *)p;
2583 	}
2584 }
2585 
2586 static void
2587 bcm_enetsw_get_ringparam(struct net_device *dev,
2588 			 struct ethtool_ringparam *ering,
2589 			 struct kernel_ethtool_ringparam *kernel_ering,
2590 			 struct netlink_ext_ack *extack)
2591 {
2592 	struct bcm_enet_priv *priv;
2593 
2594 	priv = netdev_priv(dev);
2595 
2596 	/* rx/tx ring is actually only limited by memory */
2597 	ering->rx_max_pending = 8192;
2598 	ering->tx_max_pending = 8192;
2599 	ering->rx_mini_max_pending = 0;
2600 	ering->rx_jumbo_max_pending = 0;
2601 	ering->rx_pending = priv->rx_ring_size;
2602 	ering->tx_pending = priv->tx_ring_size;
2603 }
2604 
2605 static int
2606 bcm_enetsw_set_ringparam(struct net_device *dev,
2607 			 struct ethtool_ringparam *ering,
2608 			 struct kernel_ethtool_ringparam *kernel_ering,
2609 			 struct netlink_ext_ack *extack)
2610 {
2611 	struct bcm_enet_priv *priv;
2612 	int was_running;
2613 
2614 	priv = netdev_priv(dev);
2615 
2616 	was_running = 0;
2617 	if (netif_running(dev)) {
2618 		bcm_enetsw_stop(dev);
2619 		was_running = 1;
2620 	}
2621 
2622 	priv->rx_ring_size = ering->rx_pending;
2623 	priv->tx_ring_size = ering->tx_pending;
2624 
2625 	if (was_running) {
2626 		int err;
2627 
2628 		err = bcm_enetsw_open(dev);
2629 		if (err)
2630 			dev_close(dev);
2631 	}
2632 	return 0;
2633 }
2634 
2635 static const struct ethtool_ops bcm_enetsw_ethtool_ops = {
2636 	.get_strings		= bcm_enetsw_get_strings,
2637 	.get_sset_count		= bcm_enetsw_get_sset_count,
2638 	.get_ethtool_stats      = bcm_enetsw_get_ethtool_stats,
2639 	.get_drvinfo		= bcm_enetsw_get_drvinfo,
2640 	.get_ringparam		= bcm_enetsw_get_ringparam,
2641 	.set_ringparam		= bcm_enetsw_set_ringparam,
2642 };
2643 
2644 /* allocate netdevice, request register memory and register device. */
2645 static int bcm_enetsw_probe(struct platform_device *pdev)
2646 {
2647 	struct bcm_enet_priv *priv;
2648 	struct net_device *dev;
2649 	struct bcm63xx_enetsw_platform_data *pd;
2650 	struct resource *res_mem;
2651 	int ret, irq_rx, irq_tx;
2652 
2653 	if (!bcm_enet_shared_base[0])
2654 		return -EPROBE_DEFER;
2655 
2656 	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2657 	irq_rx = platform_get_irq(pdev, 0);
2658 	irq_tx = platform_get_irq(pdev, 1);
2659 	if (!res_mem || irq_rx < 0)
2660 		return -ENODEV;
2661 
2662 	dev = alloc_etherdev(sizeof(*priv));
2663 	if (!dev)
2664 		return -ENOMEM;
2665 	priv = netdev_priv(dev);
2666 
2667 	/* initialize default and fetch platform data */
2668 	priv->enet_is_sw = true;
2669 	priv->irq_rx = irq_rx;
2670 	priv->irq_tx = irq_tx;
2671 	priv->rx_ring_size = BCMENET_DEF_RX_DESC;
2672 	priv->tx_ring_size = BCMENET_DEF_TX_DESC;
2673 	priv->dma_maxburst = BCMENETSW_DMA_MAXBURST;
2674 	priv->rx_buf_offset = NET_SKB_PAD + NET_IP_ALIGN;
2675 
2676 	pd = dev_get_platdata(&pdev->dev);
2677 	if (pd) {
2678 		eth_hw_addr_set(dev, pd->mac_addr);
2679 		memcpy(priv->used_ports, pd->used_ports,
2680 		       sizeof(pd->used_ports));
2681 		priv->num_ports = pd->num_ports;
2682 		priv->dma_has_sram = pd->dma_has_sram;
2683 		priv->dma_chan_en_mask = pd->dma_chan_en_mask;
2684 		priv->dma_chan_int_mask = pd->dma_chan_int_mask;
2685 		priv->dma_chan_width = pd->dma_chan_width;
2686 	}
2687 
2688 	ret = bcm_enet_change_mtu(dev, dev->mtu);
2689 	if (ret)
2690 		goto out;
2691 
2692 	priv->base = devm_ioremap_resource(&pdev->dev, res_mem);
2693 	if (IS_ERR(priv->base)) {
2694 		ret = PTR_ERR(priv->base);
2695 		goto out;
2696 	}
2697 
2698 	priv->mac_clk = devm_clk_get(&pdev->dev, "enetsw");
2699 	if (IS_ERR(priv->mac_clk)) {
2700 		ret = PTR_ERR(priv->mac_clk);
2701 		goto out;
2702 	}
2703 	ret = clk_prepare_enable(priv->mac_clk);
2704 	if (ret)
2705 		goto out;
2706 
2707 	priv->rx_chan = 0;
2708 	priv->tx_chan = 1;
2709 	spin_lock_init(&priv->rx_lock);
2710 
2711 	/* init rx timeout (used for oom) */
2712 	timer_setup(&priv->rx_timeout, bcm_enet_refill_rx_timer, 0);
2713 
2714 	/* register netdevice */
2715 	dev->netdev_ops = &bcm_enetsw_ops;
2716 	netif_napi_add_weight(dev, &priv->napi, bcm_enet_poll, 16);
2717 	dev->ethtool_ops = &bcm_enetsw_ethtool_ops;
2718 	SET_NETDEV_DEV(dev, &pdev->dev);
2719 
2720 	spin_lock_init(&priv->enetsw_mdio_lock);
2721 
2722 	ret = register_netdev(dev);
2723 	if (ret)
2724 		goto out_disable_clk;
2725 
2726 	netif_carrier_off(dev);
2727 	platform_set_drvdata(pdev, dev);
2728 	priv->pdev = pdev;
2729 	priv->net_dev = dev;
2730 
2731 	return 0;
2732 
2733 out_disable_clk:
2734 	clk_disable_unprepare(priv->mac_clk);
2735 out:
2736 	free_netdev(dev);
2737 	return ret;
2738 }
2739 
2740 
2741 /* exit func, stops hardware and unregisters netdevice */
2742 static int bcm_enetsw_remove(struct platform_device *pdev)
2743 {
2744 	struct bcm_enet_priv *priv;
2745 	struct net_device *dev;
2746 
2747 	/* stop netdevice */
2748 	dev = platform_get_drvdata(pdev);
2749 	priv = netdev_priv(dev);
2750 	unregister_netdev(dev);
2751 
2752 	clk_disable_unprepare(priv->mac_clk);
2753 
2754 	free_netdev(dev);
2755 	return 0;
2756 }
2757 
2758 static struct platform_driver bcm63xx_enetsw_driver = {
2759 	.probe	= bcm_enetsw_probe,
2760 	.remove	= bcm_enetsw_remove,
2761 	.driver	= {
2762 		.name	= "bcm63xx_enetsw",
2763 	},
2764 };
2765 
2766 /* reserve & remap memory space shared between all macs */
2767 static int bcm_enet_shared_probe(struct platform_device *pdev)
2768 {
2769 	void __iomem *p[3];
2770 	unsigned int i;
2771 
2772 	memset(bcm_enet_shared_base, 0, sizeof(bcm_enet_shared_base));
2773 
2774 	for (i = 0; i < 3; i++) {
2775 		p[i] = devm_platform_ioremap_resource(pdev, i);
2776 		if (IS_ERR(p[i]))
2777 			return PTR_ERR(p[i]);
2778 	}
2779 
2780 	memcpy(bcm_enet_shared_base, p, sizeof(bcm_enet_shared_base));
2781 
2782 	return 0;
2783 }
2784 
2785 /* this "shared" driver is needed because both macs share a single
2786  * address space
2787  */
2788 struct platform_driver bcm63xx_enet_shared_driver = {
2789 	.probe	= bcm_enet_shared_probe,
2790 	.driver	= {
2791 		.name	= "bcm63xx_enet_shared",
2792 	},
2793 };
2794 
2795 static struct platform_driver * const drivers[] = {
2796 	&bcm63xx_enet_shared_driver,
2797 	&bcm63xx_enet_driver,
2798 	&bcm63xx_enetsw_driver,
2799 };
2800 
2801 /* entry point */
2802 static int __init bcm_enet_init(void)
2803 {
2804 	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
2805 }
2806 
2807 static void __exit bcm_enet_exit(void)
2808 {
2809 	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
2810 }
2811 
2812 
2813 module_init(bcm_enet_init);
2814 module_exit(bcm_enet_exit);
2815 
2816 MODULE_DESCRIPTION("BCM63xx internal ethernet mac driver");
2817 MODULE_AUTHOR("Maxime Bizon <mbizon@freebox.fr>");
2818 MODULE_LICENSE("GPL");
2819