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1/*
2 * Copyright (C) 2015 Mans Rullgard <mans@mansr.com>
3 *
4 * Mostly rewritten, based on driver from Sigma Designs. Original
5 * copyright notice below.
6 *
7 *
8 * Driver for tangox SMP864x/SMP865x/SMP867x/SMP868x builtin Ethernet Mac.
9 *
10 * Copyright (C) 2005 Maxime Bizon <mbizon@freebox.fr>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 */
22
23#include <linux/module.h>
24#include <linux/etherdevice.h>
25#include <linux/delay.h>
26#include <linux/ethtool.h>
27#include <linux/interrupt.h>
28#include <linux/platform_device.h>
29#include <linux/of_device.h>
30#include <linux/of_mdio.h>
31#include <linux/of_net.h>
32#include <linux/dma-mapping.h>
33#include <linux/phy.h>
34#include <linux/cache.h>
35#include <linux/jiffies.h>
36#include <linux/io.h>
37#include <linux/iopoll.h>
38#include <asm/barrier.h>
39
40#include "nb8800.h"
41
42static void nb8800_tx_done(struct net_device *dev);
43static int nb8800_dma_stop(struct net_device *dev);
44
45static inline u8 nb8800_readb(struct nb8800_priv *priv, int reg)
46{
47 return readb_relaxed(priv->base + reg);
48}
49
50static inline u32 nb8800_readl(struct nb8800_priv *priv, int reg)
51{
52 return readl_relaxed(priv->base + reg);
53}
54
55static inline void nb8800_writeb(struct nb8800_priv *priv, int reg, u8 val)
56{
57 writeb_relaxed(val, priv->base + reg);
58}
59
60static inline void nb8800_writew(struct nb8800_priv *priv, int reg, u16 val)
61{
62 writew_relaxed(val, priv->base + reg);
63}
64
65static inline void nb8800_writel(struct nb8800_priv *priv, int reg, u32 val)
66{
67 writel_relaxed(val, priv->base + reg);
68}
69
70static inline void nb8800_maskb(struct nb8800_priv *priv, int reg,
71 u32 mask, u32 val)
72{
73 u32 old = nb8800_readb(priv, reg);
74 u32 new = (old & ~mask) | (val & mask);
75
76 if (new != old)
77 nb8800_writeb(priv, reg, new);
78}
79
80static inline void nb8800_maskl(struct nb8800_priv *priv, int reg,
81 u32 mask, u32 val)
82{
83 u32 old = nb8800_readl(priv, reg);
84 u32 new = (old & ~mask) | (val & mask);
85
86 if (new != old)
87 nb8800_writel(priv, reg, new);
88}
89
90static inline void nb8800_modb(struct nb8800_priv *priv, int reg, u8 bits,
91 bool set)
92{
93 nb8800_maskb(priv, reg, bits, set ? bits : 0);
94}
95
96static inline void nb8800_setb(struct nb8800_priv *priv, int reg, u8 bits)
97{
98 nb8800_maskb(priv, reg, bits, bits);
99}
100
101static inline void nb8800_clearb(struct nb8800_priv *priv, int reg, u8 bits)
102{
103 nb8800_maskb(priv, reg, bits, 0);
104}
105
106static inline void nb8800_modl(struct nb8800_priv *priv, int reg, u32 bits,
107 bool set)
108{
109 nb8800_maskl(priv, reg, bits, set ? bits : 0);
110}
111
112static inline void nb8800_setl(struct nb8800_priv *priv, int reg, u32 bits)
113{
114 nb8800_maskl(priv, reg, bits, bits);
115}
116
117static inline void nb8800_clearl(struct nb8800_priv *priv, int reg, u32 bits)
118{
119 nb8800_maskl(priv, reg, bits, 0);
120}
121
122static int nb8800_mdio_wait(struct mii_bus *bus)
123{
124 struct nb8800_priv *priv = bus->priv;
125 u32 val;
126
127 return readl_poll_timeout_atomic(priv->base + NB8800_MDIO_CMD,
128 val, !(val & MDIO_CMD_GO), 1, 1000);
129}
130
131static int nb8800_mdio_cmd(struct mii_bus *bus, u32 cmd)
132{
133 struct nb8800_priv *priv = bus->priv;
134 int err;
135
136 err = nb8800_mdio_wait(bus);
137 if (err)
138 return err;
139
140 nb8800_writel(priv, NB8800_MDIO_CMD, cmd);
141 udelay(10);
142 nb8800_writel(priv, NB8800_MDIO_CMD, cmd | MDIO_CMD_GO);
143
144 return nb8800_mdio_wait(bus);
145}
146
147static int nb8800_mdio_read(struct mii_bus *bus, int phy_id, int reg)
148{
149 struct nb8800_priv *priv = bus->priv;
150 u32 val;
151 int err;
152
153 err = nb8800_mdio_cmd(bus, MDIO_CMD_ADDR(phy_id) | MDIO_CMD_REG(reg));
154 if (err)
155 return err;
156
157 val = nb8800_readl(priv, NB8800_MDIO_STS);
158 if (val & MDIO_STS_ERR)
159 return 0xffff;
160
161 return val & 0xffff;
162}
163
164static int nb8800_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 val)
165{
166 u32 cmd = MDIO_CMD_ADDR(phy_id) | MDIO_CMD_REG(reg) |
167 MDIO_CMD_DATA(val) | MDIO_CMD_WR;
168
169 return nb8800_mdio_cmd(bus, cmd);
170}
171
172static void nb8800_mac_tx(struct net_device *dev, bool enable)
173{
174 struct nb8800_priv *priv = netdev_priv(dev);
175
176 while (nb8800_readl(priv, NB8800_TXC_CR) & TCR_EN)
177 cpu_relax();
178
179 nb8800_modb(priv, NB8800_TX_CTL1, TX_EN, enable);
180}
181
182static void nb8800_mac_rx(struct net_device *dev, bool enable)
183{
184 nb8800_modb(netdev_priv(dev), NB8800_RX_CTL, RX_EN, enable);
185}
186
187static void nb8800_mac_af(struct net_device *dev, bool enable)
188{
189 nb8800_modb(netdev_priv(dev), NB8800_RX_CTL, RX_AF_EN, enable);
190}
191
192static void nb8800_start_rx(struct net_device *dev)
193{
194 nb8800_setl(netdev_priv(dev), NB8800_RXC_CR, RCR_EN);
195}
196
197static int nb8800_alloc_rx(struct net_device *dev, unsigned int i, bool napi)
198{
199 struct nb8800_priv *priv = netdev_priv(dev);
200 struct nb8800_rx_desc *rxd = &priv->rx_descs[i];
201 struct nb8800_rx_buf *rxb = &priv->rx_bufs[i];
202 int size = L1_CACHE_ALIGN(RX_BUF_SIZE);
203 dma_addr_t dma_addr;
204 struct page *page;
205 unsigned long offset;
206 void *data;
207
208 data = napi ? napi_alloc_frag(size) : netdev_alloc_frag(size);
209 if (!data)
210 return -ENOMEM;
211
212 page = virt_to_head_page(data);
213 offset = data - page_address(page);
214
215 dma_addr = dma_map_page(&dev->dev, page, offset, RX_BUF_SIZE,
216 DMA_FROM_DEVICE);
217
218 if (dma_mapping_error(&dev->dev, dma_addr)) {
219 skb_free_frag(data);
220 return -ENOMEM;
221 }
222
223 rxb->page = page;
224 rxb->offset = offset;
225 rxd->desc.s_addr = dma_addr;
226
227 return 0;
228}
229
230static void nb8800_receive(struct net_device *dev, unsigned int i,
231 unsigned int len)
232{
233 struct nb8800_priv *priv = netdev_priv(dev);
234 struct nb8800_rx_desc *rxd = &priv->rx_descs[i];
235 struct page *page = priv->rx_bufs[i].page;
236 int offset = priv->rx_bufs[i].offset;
237 void *data = page_address(page) + offset;
238 dma_addr_t dma = rxd->desc.s_addr;
239 struct sk_buff *skb;
240 unsigned int size;
241 int err;
242
243 size = len <= RX_COPYBREAK ? len : RX_COPYHDR;
244
245 skb = napi_alloc_skb(&priv->napi, size);
246 if (!skb) {
247 netdev_err(dev, "rx skb allocation failed\n");
248 dev->stats.rx_dropped++;
249 return;
250 }
251
252 if (len <= RX_COPYBREAK) {
253 dma_sync_single_for_cpu(&dev->dev, dma, len, DMA_FROM_DEVICE);
254 skb_put_data(skb, data, len);
255 dma_sync_single_for_device(&dev->dev, dma, len,
256 DMA_FROM_DEVICE);
257 } else {
258 err = nb8800_alloc_rx(dev, i, true);
259 if (err) {
260 netdev_err(dev, "rx buffer allocation failed\n");
261 dev->stats.rx_dropped++;
262 dev_kfree_skb(skb);
263 return;
264 }
265
266 dma_unmap_page(&dev->dev, dma, RX_BUF_SIZE, DMA_FROM_DEVICE);
267 skb_put_data(skb, data, RX_COPYHDR);
268 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
269 offset + RX_COPYHDR, len - RX_COPYHDR,
270 RX_BUF_SIZE);
271 }
272
273 skb->protocol = eth_type_trans(skb, dev);
274 napi_gro_receive(&priv->napi, skb);
275}
276
277static void nb8800_rx_error(struct net_device *dev, u32 report)
278{
279 if (report & RX_LENGTH_ERR)
280 dev->stats.rx_length_errors++;
281
282 if (report & RX_FCS_ERR)
283 dev->stats.rx_crc_errors++;
284
285 if (report & RX_FIFO_OVERRUN)
286 dev->stats.rx_fifo_errors++;
287
288 if (report & RX_ALIGNMENT_ERROR)
289 dev->stats.rx_frame_errors++;
290
291 dev->stats.rx_errors++;
292}
293
294static int nb8800_poll(struct napi_struct *napi, int budget)
295{
296 struct net_device *dev = napi->dev;
297 struct nb8800_priv *priv = netdev_priv(dev);
298 struct nb8800_rx_desc *rxd;
299 unsigned int last = priv->rx_eoc;
300 unsigned int next;
301 int work = 0;
302
303 nb8800_tx_done(dev);
304
305again:
306 do {
307 struct nb8800_rx_buf *rxb;
308 unsigned int len;
309
310 next = (last + 1) % RX_DESC_COUNT;
311
312 rxb = &priv->rx_bufs[next];
313 rxd = &priv->rx_descs[next];
314
315 if (!rxd->report)
316 break;
317
318 len = RX_BYTES_TRANSFERRED(rxd->report);
319
320 if (IS_RX_ERROR(rxd->report))
321 nb8800_rx_error(dev, rxd->report);
322 else
323 nb8800_receive(dev, next, len);
324
325 dev->stats.rx_packets++;
326 dev->stats.rx_bytes += len;
327
328 if (rxd->report & RX_MULTICAST_PKT)
329 dev->stats.multicast++;
330
331 rxd->report = 0;
332 last = next;
333 work++;
334 } while (work < budget);
335
336 if (work) {
337 priv->rx_descs[last].desc.config |= DESC_EOC;
338 wmb(); /* ensure new EOC is written before clearing old */
339 priv->rx_descs[priv->rx_eoc].desc.config &= ~DESC_EOC;
340 priv->rx_eoc = last;
341 nb8800_start_rx(dev);
342 }
343
344 if (work < budget) {
345 nb8800_writel(priv, NB8800_RX_ITR, priv->rx_itr_irq);
346
347 /* If a packet arrived after we last checked but
348 * before writing RX_ITR, the interrupt will be
349 * delayed, so we retrieve it now.
350 */
351 if (priv->rx_descs[next].report)
352 goto again;
353
354 napi_complete_done(napi, work);
355 }
356
357 return work;
358}
359
360static void __nb8800_tx_dma_start(struct net_device *dev)
361{
362 struct nb8800_priv *priv = netdev_priv(dev);
363 struct nb8800_tx_buf *txb;
364 u32 txc_cr;
365
366 txb = &priv->tx_bufs[priv->tx_queue];
367 if (!txb->ready)
368 return;
369
370 txc_cr = nb8800_readl(priv, NB8800_TXC_CR);
371 if (txc_cr & TCR_EN)
372 return;
373
374 nb8800_writel(priv, NB8800_TX_DESC_ADDR, txb->dma_desc);
375 wmb(); /* ensure desc addr is written before starting DMA */
376 nb8800_writel(priv, NB8800_TXC_CR, txc_cr | TCR_EN);
377
378 priv->tx_queue = (priv->tx_queue + txb->chain_len) % TX_DESC_COUNT;
379}
380
381static void nb8800_tx_dma_start(struct net_device *dev)
382{
383 struct nb8800_priv *priv = netdev_priv(dev);
384
385 spin_lock_irq(&priv->tx_lock);
386 __nb8800_tx_dma_start(dev);
387 spin_unlock_irq(&priv->tx_lock);
388}
389
390static void nb8800_tx_dma_start_irq(struct net_device *dev)
391{
392 struct nb8800_priv *priv = netdev_priv(dev);
393
394 spin_lock(&priv->tx_lock);
395 __nb8800_tx_dma_start(dev);
396 spin_unlock(&priv->tx_lock);
397}
398
399static int nb8800_xmit(struct sk_buff *skb, struct net_device *dev)
400{
401 struct nb8800_priv *priv = netdev_priv(dev);
402 struct nb8800_tx_desc *txd;
403 struct nb8800_tx_buf *txb;
404 struct nb8800_dma_desc *desc;
405 dma_addr_t dma_addr;
406 unsigned int dma_len;
407 unsigned int align;
408 unsigned int next;
409
410 if (atomic_read(&priv->tx_free) <= NB8800_DESC_LOW) {
411 netif_stop_queue(dev);
412 return NETDEV_TX_BUSY;
413 }
414
415 align = (8 - (uintptr_t)skb->data) & 7;
416
417 dma_len = skb->len - align;
418 dma_addr = dma_map_single(&dev->dev, skb->data + align,
419 dma_len, DMA_TO_DEVICE);
420
421 if (dma_mapping_error(&dev->dev, dma_addr)) {
422 netdev_err(dev, "tx dma mapping error\n");
423 kfree_skb(skb);
424 dev->stats.tx_dropped++;
425 return NETDEV_TX_OK;
426 }
427
428 if (atomic_dec_return(&priv->tx_free) <= NB8800_DESC_LOW) {
429 netif_stop_queue(dev);
430 skb->xmit_more = 0;
431 }
432
433 next = priv->tx_next;
434 txb = &priv->tx_bufs[next];
435 txd = &priv->tx_descs[next];
436 desc = &txd->desc[0];
437
438 next = (next + 1) % TX_DESC_COUNT;
439
440 if (align) {
441 memcpy(txd->buf, skb->data, align);
442
443 desc->s_addr =
444 txb->dma_desc + offsetof(struct nb8800_tx_desc, buf);
445 desc->n_addr = txb->dma_desc + sizeof(txd->desc[0]);
446 desc->config = DESC_BTS(2) | DESC_DS | align;
447
448 desc++;
449 }
450
451 desc->s_addr = dma_addr;
452 desc->n_addr = priv->tx_bufs[next].dma_desc;
453 desc->config = DESC_BTS(2) | DESC_DS | DESC_EOF | dma_len;
454
455 if (!skb->xmit_more)
456 desc->config |= DESC_EOC;
457
458 txb->skb = skb;
459 txb->dma_addr = dma_addr;
460 txb->dma_len = dma_len;
461
462 if (!priv->tx_chain) {
463 txb->chain_len = 1;
464 priv->tx_chain = txb;
465 } else {
466 priv->tx_chain->chain_len++;
467 }
468
469 netdev_sent_queue(dev, skb->len);
470
471 priv->tx_next = next;
472
473 if (!skb->xmit_more) {
474 smp_wmb();
475 priv->tx_chain->ready = true;
476 priv->tx_chain = NULL;
477 nb8800_tx_dma_start(dev);
478 }
479
480 return NETDEV_TX_OK;
481}
482
483static void nb8800_tx_error(struct net_device *dev, u32 report)
484{
485 if (report & TX_LATE_COLLISION)
486 dev->stats.collisions++;
487
488 if (report & TX_PACKET_DROPPED)
489 dev->stats.tx_dropped++;
490
491 if (report & TX_FIFO_UNDERRUN)
492 dev->stats.tx_fifo_errors++;
493
494 dev->stats.tx_errors++;
495}
496
497static void nb8800_tx_done(struct net_device *dev)
498{
499 struct nb8800_priv *priv = netdev_priv(dev);
500 unsigned int limit = priv->tx_next;
501 unsigned int done = priv->tx_done;
502 unsigned int packets = 0;
503 unsigned int len = 0;
504
505 while (done != limit) {
506 struct nb8800_tx_desc *txd = &priv->tx_descs[done];
507 struct nb8800_tx_buf *txb = &priv->tx_bufs[done];
508 struct sk_buff *skb;
509
510 if (!txd->report)
511 break;
512
513 skb = txb->skb;
514 len += skb->len;
515
516 dma_unmap_single(&dev->dev, txb->dma_addr, txb->dma_len,
517 DMA_TO_DEVICE);
518
519 if (IS_TX_ERROR(txd->report)) {
520 nb8800_tx_error(dev, txd->report);
521 kfree_skb(skb);
522 } else {
523 consume_skb(skb);
524 }
525
526 dev->stats.tx_packets++;
527 dev->stats.tx_bytes += TX_BYTES_TRANSFERRED(txd->report);
528 dev->stats.collisions += TX_EARLY_COLLISIONS(txd->report);
529
530 txb->skb = NULL;
531 txb->ready = false;
532 txd->report = 0;
533
534 done = (done + 1) % TX_DESC_COUNT;
535 packets++;
536 }
537
538 if (packets) {
539 smp_mb__before_atomic();
540 atomic_add(packets, &priv->tx_free);
541 netdev_completed_queue(dev, packets, len);
542 netif_wake_queue(dev);
543 priv->tx_done = done;
544 }
545}
546
547static irqreturn_t nb8800_irq(int irq, void *dev_id)
548{
549 struct net_device *dev = dev_id;
550 struct nb8800_priv *priv = netdev_priv(dev);
551 irqreturn_t ret = IRQ_NONE;
552 u32 val;
553
554 /* tx interrupt */
555 val = nb8800_readl(priv, NB8800_TXC_SR);
556 if (val) {
557 nb8800_writel(priv, NB8800_TXC_SR, val);
558
559 if (val & TSR_DI)
560 nb8800_tx_dma_start_irq(dev);
561
562 if (val & TSR_TI)
563 napi_schedule_irqoff(&priv->napi);
564
565 if (unlikely(val & TSR_DE))
566 netdev_err(dev, "TX DMA error\n");
567
568 /* should never happen with automatic status retrieval */
569 if (unlikely(val & TSR_TO))
570 netdev_err(dev, "TX Status FIFO overflow\n");
571
572 ret = IRQ_HANDLED;
573 }
574
575 /* rx interrupt */
576 val = nb8800_readl(priv, NB8800_RXC_SR);
577 if (val) {
578 nb8800_writel(priv, NB8800_RXC_SR, val);
579
580 if (likely(val & (RSR_RI | RSR_DI))) {
581 nb8800_writel(priv, NB8800_RX_ITR, priv->rx_itr_poll);
582 napi_schedule_irqoff(&priv->napi);
583 }
584
585 if (unlikely(val & RSR_DE))
586 netdev_err(dev, "RX DMA error\n");
587
588 /* should never happen with automatic status retrieval */
589 if (unlikely(val & RSR_RO))
590 netdev_err(dev, "RX Status FIFO overflow\n");
591
592 ret = IRQ_HANDLED;
593 }
594
595 return ret;
596}
597
598static void nb8800_mac_config(struct net_device *dev)
599{
600 struct nb8800_priv *priv = netdev_priv(dev);
601 bool gigabit = priv->speed == SPEED_1000;
602 u32 mac_mode_mask = RGMII_MODE | HALF_DUPLEX | GMAC_MODE;
603 u32 mac_mode = 0;
604 u32 slot_time;
605 u32 phy_clk;
606 u32 ict;
607
608 if (!priv->duplex)
609 mac_mode |= HALF_DUPLEX;
610
611 if (gigabit) {
612 if (phy_interface_is_rgmii(dev->phydev))
613 mac_mode |= RGMII_MODE;
614
615 mac_mode |= GMAC_MODE;
616 phy_clk = 125000000;
617
618 /* Should be 512 but register is only 8 bits */
619 slot_time = 255;
620 } else {
621 phy_clk = 25000000;
622 slot_time = 128;
623 }
624
625 ict = DIV_ROUND_UP(phy_clk, clk_get_rate(priv->clk));
626
627 nb8800_writeb(priv, NB8800_IC_THRESHOLD, ict);
628 nb8800_writeb(priv, NB8800_SLOT_TIME, slot_time);
629 nb8800_maskb(priv, NB8800_MAC_MODE, mac_mode_mask, mac_mode);
630}
631
632static void nb8800_pause_config(struct net_device *dev)
633{
634 struct nb8800_priv *priv = netdev_priv(dev);
635 struct phy_device *phydev = dev->phydev;
636 u32 rxcr;
637
638 if (priv->pause_aneg) {
639 if (!phydev || !phydev->link)
640 return;
641
642 priv->pause_rx = phydev->pause;
643 priv->pause_tx = phydev->pause ^ phydev->asym_pause;
644 }
645
646 nb8800_modb(priv, NB8800_RX_CTL, RX_PAUSE_EN, priv->pause_rx);
647
648 rxcr = nb8800_readl(priv, NB8800_RXC_CR);
649 if (!!(rxcr & RCR_FL) == priv->pause_tx)
650 return;
651
652 if (netif_running(dev)) {
653 napi_disable(&priv->napi);
654 netif_tx_lock_bh(dev);
655 nb8800_dma_stop(dev);
656 nb8800_modl(priv, NB8800_RXC_CR, RCR_FL, priv->pause_tx);
657 nb8800_start_rx(dev);
658 netif_tx_unlock_bh(dev);
659 napi_enable(&priv->napi);
660 } else {
661 nb8800_modl(priv, NB8800_RXC_CR, RCR_FL, priv->pause_tx);
662 }
663}
664
665static void nb8800_link_reconfigure(struct net_device *dev)
666{
667 struct nb8800_priv *priv = netdev_priv(dev);
668 struct phy_device *phydev = dev->phydev;
669 int change = 0;
670
671 if (phydev->link) {
672 if (phydev->speed != priv->speed) {
673 priv->speed = phydev->speed;
674 change = 1;
675 }
676
677 if (phydev->duplex != priv->duplex) {
678 priv->duplex = phydev->duplex;
679 change = 1;
680 }
681
682 if (change)
683 nb8800_mac_config(dev);
684
685 nb8800_pause_config(dev);
686 }
687
688 if (phydev->link != priv->link) {
689 priv->link = phydev->link;
690 change = 1;
691 }
692
693 if (change)
694 phy_print_status(phydev);
695}
696
697static void nb8800_update_mac_addr(struct net_device *dev)
698{
699 struct nb8800_priv *priv = netdev_priv(dev);
700 int i;
701
702 for (i = 0; i < ETH_ALEN; i++)
703 nb8800_writeb(priv, NB8800_SRC_ADDR(i), dev->dev_addr[i]);
704
705 for (i = 0; i < ETH_ALEN; i++)
706 nb8800_writeb(priv, NB8800_UC_ADDR(i), dev->dev_addr[i]);
707}
708
709static int nb8800_set_mac_address(struct net_device *dev, void *addr)
710{
711 struct sockaddr *sock = addr;
712
713 if (netif_running(dev))
714 return -EBUSY;
715
716 ether_addr_copy(dev->dev_addr, sock->sa_data);
717 nb8800_update_mac_addr(dev);
718
719 return 0;
720}
721
722static void nb8800_mc_init(struct net_device *dev, int val)
723{
724 struct nb8800_priv *priv = netdev_priv(dev);
725
726 nb8800_writeb(priv, NB8800_MC_INIT, val);
727 readb_poll_timeout_atomic(priv->base + NB8800_MC_INIT, val, !val,
728 1, 1000);
729}
730
731static void nb8800_set_rx_mode(struct net_device *dev)
732{
733 struct nb8800_priv *priv = netdev_priv(dev);
734 struct netdev_hw_addr *ha;
735 int i;
736
737 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
738 nb8800_mac_af(dev, false);
739 return;
740 }
741
742 nb8800_mac_af(dev, true);
743 nb8800_mc_init(dev, 0);
744
745 netdev_for_each_mc_addr(ha, dev) {
746 for (i = 0; i < ETH_ALEN; i++)
747 nb8800_writeb(priv, NB8800_MC_ADDR(i), ha->addr[i]);
748
749 nb8800_mc_init(dev, 0xff);
750 }
751}
752
753#define RX_DESC_SIZE (RX_DESC_COUNT * sizeof(struct nb8800_rx_desc))
754#define TX_DESC_SIZE (TX_DESC_COUNT * sizeof(struct nb8800_tx_desc))
755
756static void nb8800_dma_free(struct net_device *dev)
757{
758 struct nb8800_priv *priv = netdev_priv(dev);
759 unsigned int i;
760
761 if (priv->rx_bufs) {
762 for (i = 0; i < RX_DESC_COUNT; i++)
763 if (priv->rx_bufs[i].page)
764 put_page(priv->rx_bufs[i].page);
765
766 kfree(priv->rx_bufs);
767 priv->rx_bufs = NULL;
768 }
769
770 if (priv->tx_bufs) {
771 for (i = 0; i < TX_DESC_COUNT; i++)
772 kfree_skb(priv->tx_bufs[i].skb);
773
774 kfree(priv->tx_bufs);
775 priv->tx_bufs = NULL;
776 }
777
778 if (priv->rx_descs) {
779 dma_free_coherent(dev->dev.parent, RX_DESC_SIZE, priv->rx_descs,
780 priv->rx_desc_dma);
781 priv->rx_descs = NULL;
782 }
783
784 if (priv->tx_descs) {
785 dma_free_coherent(dev->dev.parent, TX_DESC_SIZE, priv->tx_descs,
786 priv->tx_desc_dma);
787 priv->tx_descs = NULL;
788 }
789}
790
791static void nb8800_dma_reset(struct net_device *dev)
792{
793 struct nb8800_priv *priv = netdev_priv(dev);
794 struct nb8800_rx_desc *rxd;
795 struct nb8800_tx_desc *txd;
796 unsigned int i;
797
798 for (i = 0; i < RX_DESC_COUNT; i++) {
799 dma_addr_t rx_dma = priv->rx_desc_dma + i * sizeof(*rxd);
800
801 rxd = &priv->rx_descs[i];
802 rxd->desc.n_addr = rx_dma + sizeof(*rxd);
803 rxd->desc.r_addr =
804 rx_dma + offsetof(struct nb8800_rx_desc, report);
805 rxd->desc.config = priv->rx_dma_config;
806 rxd->report = 0;
807 }
808
809 rxd->desc.n_addr = priv->rx_desc_dma;
810 rxd->desc.config |= DESC_EOC;
811
812 priv->rx_eoc = RX_DESC_COUNT - 1;
813
814 for (i = 0; i < TX_DESC_COUNT; i++) {
815 struct nb8800_tx_buf *txb = &priv->tx_bufs[i];
816 dma_addr_t r_dma = txb->dma_desc +
817 offsetof(struct nb8800_tx_desc, report);
818
819 txd = &priv->tx_descs[i];
820 txd->desc[0].r_addr = r_dma;
821 txd->desc[1].r_addr = r_dma;
822 txd->report = 0;
823 }
824
825 priv->tx_next = 0;
826 priv->tx_queue = 0;
827 priv->tx_done = 0;
828 atomic_set(&priv->tx_free, TX_DESC_COUNT);
829
830 nb8800_writel(priv, NB8800_RX_DESC_ADDR, priv->rx_desc_dma);
831
832 wmb(); /* ensure all setup is written before starting */
833}
834
835static int nb8800_dma_init(struct net_device *dev)
836{
837 struct nb8800_priv *priv = netdev_priv(dev);
838 unsigned int n_rx = RX_DESC_COUNT;
839 unsigned int n_tx = TX_DESC_COUNT;
840 unsigned int i;
841 int err;
842
843 priv->rx_descs = dma_alloc_coherent(dev->dev.parent, RX_DESC_SIZE,
844 &priv->rx_desc_dma, GFP_KERNEL);
845 if (!priv->rx_descs)
846 goto err_out;
847
848 priv->rx_bufs = kcalloc(n_rx, sizeof(*priv->rx_bufs), GFP_KERNEL);
849 if (!priv->rx_bufs)
850 goto err_out;
851
852 for (i = 0; i < n_rx; i++) {
853 err = nb8800_alloc_rx(dev, i, false);
854 if (err)
855 goto err_out;
856 }
857
858 priv->tx_descs = dma_alloc_coherent(dev->dev.parent, TX_DESC_SIZE,
859 &priv->tx_desc_dma, GFP_KERNEL);
860 if (!priv->tx_descs)
861 goto err_out;
862
863 priv->tx_bufs = kcalloc(n_tx, sizeof(*priv->tx_bufs), GFP_KERNEL);
864 if (!priv->tx_bufs)
865 goto err_out;
866
867 for (i = 0; i < n_tx; i++)
868 priv->tx_bufs[i].dma_desc =
869 priv->tx_desc_dma + i * sizeof(struct nb8800_tx_desc);
870
871 nb8800_dma_reset(dev);
872
873 return 0;
874
875err_out:
876 nb8800_dma_free(dev);
877
878 return -ENOMEM;
879}
880
881static int nb8800_dma_stop(struct net_device *dev)
882{
883 struct nb8800_priv *priv = netdev_priv(dev);
884 struct nb8800_tx_buf *txb = &priv->tx_bufs[0];
885 struct nb8800_tx_desc *txd = &priv->tx_descs[0];
886 int retry = 5;
887 u32 txcr;
888 u32 rxcr;
889 int err;
890 unsigned int i;
891
892 /* wait for tx to finish */
893 err = readl_poll_timeout_atomic(priv->base + NB8800_TXC_CR, txcr,
894 !(txcr & TCR_EN) &&
895 priv->tx_done == priv->tx_next,
896 1000, 1000000);
897 if (err)
898 return err;
899
900 /* The rx DMA only stops if it reaches the end of chain.
901 * To make this happen, we set the EOC flag on all rx
902 * descriptors, put the device in loopback mode, and send
903 * a few dummy frames. The interrupt handler will ignore
904 * these since NAPI is disabled and no real frames are in
905 * the tx queue.
906 */
907
908 for (i = 0; i < RX_DESC_COUNT; i++)
909 priv->rx_descs[i].desc.config |= DESC_EOC;
910
911 txd->desc[0].s_addr =
912 txb->dma_desc + offsetof(struct nb8800_tx_desc, buf);
913 txd->desc[0].config = DESC_BTS(2) | DESC_DS | DESC_EOF | DESC_EOC | 8;
914 memset(txd->buf, 0, sizeof(txd->buf));
915
916 nb8800_mac_af(dev, false);
917 nb8800_setb(priv, NB8800_MAC_MODE, LOOPBACK_EN);
918
919 do {
920 nb8800_writel(priv, NB8800_TX_DESC_ADDR, txb->dma_desc);
921 wmb();
922 nb8800_writel(priv, NB8800_TXC_CR, txcr | TCR_EN);
923
924 err = readl_poll_timeout_atomic(priv->base + NB8800_RXC_CR,
925 rxcr, !(rxcr & RCR_EN),
926 1000, 100000);
927 } while (err && --retry);
928
929 nb8800_mac_af(dev, true);
930 nb8800_clearb(priv, NB8800_MAC_MODE, LOOPBACK_EN);
931 nb8800_dma_reset(dev);
932
933 return retry ? 0 : -ETIMEDOUT;
934}
935
936static void nb8800_pause_adv(struct net_device *dev)
937{
938 struct nb8800_priv *priv = netdev_priv(dev);
939 struct phy_device *phydev = dev->phydev;
940 u32 adv = 0;
941
942 if (!phydev)
943 return;
944
945 if (priv->pause_rx)
946 adv |= ADVERTISED_Pause | ADVERTISED_Asym_Pause;
947 if (priv->pause_tx)
948 adv ^= ADVERTISED_Asym_Pause;
949
950 phydev->supported |= adv;
951 phydev->advertising |= adv;
952}
953
954static int nb8800_open(struct net_device *dev)
955{
956 struct nb8800_priv *priv = netdev_priv(dev);
957 struct phy_device *phydev;
958 int err;
959
960 /* clear any pending interrupts */
961 nb8800_writel(priv, NB8800_RXC_SR, 0xf);
962 nb8800_writel(priv, NB8800_TXC_SR, 0xf);
963
964 err = nb8800_dma_init(dev);
965 if (err)
966 return err;
967
968 err = request_irq(dev->irq, nb8800_irq, 0, dev_name(&dev->dev), dev);
969 if (err)
970 goto err_free_dma;
971
972 nb8800_mac_rx(dev, true);
973 nb8800_mac_tx(dev, true);
974
975 phydev = of_phy_connect(dev, priv->phy_node,
976 nb8800_link_reconfigure, 0,
977 priv->phy_mode);
978 if (!phydev) {
979 err = -ENODEV;
980 goto err_free_irq;
981 }
982
983 nb8800_pause_adv(dev);
984
985 netdev_reset_queue(dev);
986 napi_enable(&priv->napi);
987 netif_start_queue(dev);
988
989 nb8800_start_rx(dev);
990 phy_start(phydev);
991
992 return 0;
993
994err_free_irq:
995 free_irq(dev->irq, dev);
996err_free_dma:
997 nb8800_dma_free(dev);
998
999 return err;
1000}
1001
1002static int nb8800_stop(struct net_device *dev)
1003{
1004 struct nb8800_priv *priv = netdev_priv(dev);
1005 struct phy_device *phydev = dev->phydev;
1006
1007 phy_stop(phydev);
1008
1009 netif_stop_queue(dev);
1010 napi_disable(&priv->napi);
1011
1012 nb8800_dma_stop(dev);
1013 nb8800_mac_rx(dev, false);
1014 nb8800_mac_tx(dev, false);
1015
1016 phy_disconnect(phydev);
1017
1018 free_irq(dev->irq, dev);
1019
1020 nb8800_dma_free(dev);
1021
1022 return 0;
1023}
1024
1025static int nb8800_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1026{
1027 return phy_mii_ioctl(dev->phydev, rq, cmd);
1028}
1029
1030static const struct net_device_ops nb8800_netdev_ops = {
1031 .ndo_open = nb8800_open,
1032 .ndo_stop = nb8800_stop,
1033 .ndo_start_xmit = nb8800_xmit,
1034 .ndo_set_mac_address = nb8800_set_mac_address,
1035 .ndo_set_rx_mode = nb8800_set_rx_mode,
1036 .ndo_do_ioctl = nb8800_ioctl,
1037 .ndo_validate_addr = eth_validate_addr,
1038};
1039
1040static void nb8800_get_pauseparam(struct net_device *dev,
1041 struct ethtool_pauseparam *pp)
1042{
1043 struct nb8800_priv *priv = netdev_priv(dev);
1044
1045 pp->autoneg = priv->pause_aneg;
1046 pp->rx_pause = priv->pause_rx;
1047 pp->tx_pause = priv->pause_tx;
1048}
1049
1050static int nb8800_set_pauseparam(struct net_device *dev,
1051 struct ethtool_pauseparam *pp)
1052{
1053 struct nb8800_priv *priv = netdev_priv(dev);
1054 struct phy_device *phydev = dev->phydev;
1055
1056 priv->pause_aneg = pp->autoneg;
1057 priv->pause_rx = pp->rx_pause;
1058 priv->pause_tx = pp->tx_pause;
1059
1060 nb8800_pause_adv(dev);
1061
1062 if (!priv->pause_aneg)
1063 nb8800_pause_config(dev);
1064 else if (phydev)
1065 phy_start_aneg(phydev);
1066
1067 return 0;
1068}
1069
1070static const char nb8800_stats_names[][ETH_GSTRING_LEN] = {
1071 "rx_bytes_ok",
1072 "rx_frames_ok",
1073 "rx_undersize_frames",
1074 "rx_fragment_frames",
1075 "rx_64_byte_frames",
1076 "rx_127_byte_frames",
1077 "rx_255_byte_frames",
1078 "rx_511_byte_frames",
1079 "rx_1023_byte_frames",
1080 "rx_max_size_frames",
1081 "rx_oversize_frames",
1082 "rx_bad_fcs_frames",
1083 "rx_broadcast_frames",
1084 "rx_multicast_frames",
1085 "rx_control_frames",
1086 "rx_pause_frames",
1087 "rx_unsup_control_frames",
1088 "rx_align_error_frames",
1089 "rx_overrun_frames",
1090 "rx_jabber_frames",
1091 "rx_bytes",
1092 "rx_frames",
1093
1094 "tx_bytes_ok",
1095 "tx_frames_ok",
1096 "tx_64_byte_frames",
1097 "tx_127_byte_frames",
1098 "tx_255_byte_frames",
1099 "tx_511_byte_frames",
1100 "tx_1023_byte_frames",
1101 "tx_max_size_frames",
1102 "tx_oversize_frames",
1103 "tx_broadcast_frames",
1104 "tx_multicast_frames",
1105 "tx_control_frames",
1106 "tx_pause_frames",
1107 "tx_underrun_frames",
1108 "tx_single_collision_frames",
1109 "tx_multi_collision_frames",
1110 "tx_deferred_collision_frames",
1111 "tx_late_collision_frames",
1112 "tx_excessive_collision_frames",
1113 "tx_bytes",
1114 "tx_frames",
1115 "tx_collisions",
1116};
1117
1118#define NB8800_NUM_STATS ARRAY_SIZE(nb8800_stats_names)
1119
1120static int nb8800_get_sset_count(struct net_device *dev, int sset)
1121{
1122 if (sset == ETH_SS_STATS)
1123 return NB8800_NUM_STATS;
1124
1125 return -EOPNOTSUPP;
1126}
1127
1128static void nb8800_get_strings(struct net_device *dev, u32 sset, u8 *buf)
1129{
1130 if (sset == ETH_SS_STATS)
1131 memcpy(buf, &nb8800_stats_names, sizeof(nb8800_stats_names));
1132}
1133
1134static u32 nb8800_read_stat(struct net_device *dev, int index)
1135{
1136 struct nb8800_priv *priv = netdev_priv(dev);
1137
1138 nb8800_writeb(priv, NB8800_STAT_INDEX, index);
1139
1140 return nb8800_readl(priv, NB8800_STAT_DATA);
1141}
1142
1143static void nb8800_get_ethtool_stats(struct net_device *dev,
1144 struct ethtool_stats *estats, u64 *st)
1145{
1146 unsigned int i;
1147 u32 rx, tx;
1148
1149 for (i = 0; i < NB8800_NUM_STATS / 2; i++) {
1150 rx = nb8800_read_stat(dev, i);
1151 tx = nb8800_read_stat(dev, i | 0x80);
1152 st[i] = rx;
1153 st[i + NB8800_NUM_STATS / 2] = tx;
1154 }
1155}
1156
1157static const struct ethtool_ops nb8800_ethtool_ops = {
1158 .nway_reset = phy_ethtool_nway_reset,
1159 .get_link = ethtool_op_get_link,
1160 .get_pauseparam = nb8800_get_pauseparam,
1161 .set_pauseparam = nb8800_set_pauseparam,
1162 .get_sset_count = nb8800_get_sset_count,
1163 .get_strings = nb8800_get_strings,
1164 .get_ethtool_stats = nb8800_get_ethtool_stats,
1165 .get_link_ksettings = phy_ethtool_get_link_ksettings,
1166 .set_link_ksettings = phy_ethtool_set_link_ksettings,
1167};
1168
1169static int nb8800_hw_init(struct net_device *dev)
1170{
1171 struct nb8800_priv *priv = netdev_priv(dev);
1172 u32 val;
1173
1174 val = TX_RETRY_EN | TX_PAD_EN | TX_APPEND_FCS;
1175 nb8800_writeb(priv, NB8800_TX_CTL1, val);
1176
1177 /* Collision retry count */
1178 nb8800_writeb(priv, NB8800_TX_CTL2, 5);
1179
1180 val = RX_PAD_STRIP | RX_AF_EN;
1181 nb8800_writeb(priv, NB8800_RX_CTL, val);
1182
1183 /* Chosen by fair dice roll */
1184 nb8800_writeb(priv, NB8800_RANDOM_SEED, 4);
1185
1186 /* TX cycles per deferral period */
1187 nb8800_writeb(priv, NB8800_TX_SDP, 12);
1188
1189 /* The following three threshold values have been
1190 * experimentally determined for good results.
1191 */
1192
1193 /* RX/TX FIFO threshold for partial empty (64-bit entries) */
1194 nb8800_writeb(priv, NB8800_PE_THRESHOLD, 0);
1195
1196 /* RX/TX FIFO threshold for partial full (64-bit entries) */
1197 nb8800_writeb(priv, NB8800_PF_THRESHOLD, 255);
1198
1199 /* Buffer size for transmit (64-bit entries) */
1200 nb8800_writeb(priv, NB8800_TX_BUFSIZE, 64);
1201
1202 /* Configure tx DMA */
1203
1204 val = nb8800_readl(priv, NB8800_TXC_CR);
1205 val &= TCR_LE; /* keep endian setting */
1206 val |= TCR_DM; /* DMA descriptor mode */
1207 val |= TCR_RS; /* automatically store tx status */
1208 val |= TCR_DIE; /* interrupt on DMA chain completion */
1209 val |= TCR_TFI(7); /* interrupt after 7 frames transmitted */
1210 val |= TCR_BTS(2); /* 32-byte bus transaction size */
1211 nb8800_writel(priv, NB8800_TXC_CR, val);
1212
1213 /* TX complete interrupt after 10 ms or 7 frames (see above) */
1214 val = clk_get_rate(priv->clk) / 100;
1215 nb8800_writel(priv, NB8800_TX_ITR, val);
1216
1217 /* Configure rx DMA */
1218
1219 val = nb8800_readl(priv, NB8800_RXC_CR);
1220 val &= RCR_LE; /* keep endian setting */
1221 val |= RCR_DM; /* DMA descriptor mode */
1222 val |= RCR_RS; /* automatically store rx status */
1223 val |= RCR_DIE; /* interrupt at end of DMA chain */
1224 val |= RCR_RFI(7); /* interrupt after 7 frames received */
1225 val |= RCR_BTS(2); /* 32-byte bus transaction size */
1226 nb8800_writel(priv, NB8800_RXC_CR, val);
1227
1228 /* The rx interrupt can fire before the DMA has completed
1229 * unless a small delay is added. 50 us is hopefully enough.
1230 */
1231 priv->rx_itr_irq = clk_get_rate(priv->clk) / 20000;
1232
1233 /* In NAPI poll mode we want to disable interrupts, but the
1234 * hardware does not permit this. Delay 10 ms instead.
1235 */
1236 priv->rx_itr_poll = clk_get_rate(priv->clk) / 100;
1237
1238 nb8800_writel(priv, NB8800_RX_ITR, priv->rx_itr_irq);
1239
1240 priv->rx_dma_config = RX_BUF_SIZE | DESC_BTS(2) | DESC_DS | DESC_EOF;
1241
1242 /* Flow control settings */
1243
1244 /* Pause time of 0.1 ms */
1245 val = 100000 / 512;
1246 nb8800_writeb(priv, NB8800_PQ1, val >> 8);
1247 nb8800_writeb(priv, NB8800_PQ2, val & 0xff);
1248
1249 /* Auto-negotiate by default */
1250 priv->pause_aneg = true;
1251 priv->pause_rx = true;
1252 priv->pause_tx = true;
1253
1254 nb8800_mc_init(dev, 0);
1255
1256 return 0;
1257}
1258
1259static int nb8800_tangox_init(struct net_device *dev)
1260{
1261 struct nb8800_priv *priv = netdev_priv(dev);
1262 u32 pad_mode = PAD_MODE_MII;
1263
1264 switch (priv->phy_mode) {
1265 case PHY_INTERFACE_MODE_MII:
1266 case PHY_INTERFACE_MODE_GMII:
1267 pad_mode = PAD_MODE_MII;
1268 break;
1269
1270 case PHY_INTERFACE_MODE_RGMII:
1271 case PHY_INTERFACE_MODE_RGMII_ID:
1272 case PHY_INTERFACE_MODE_RGMII_RXID:
1273 case PHY_INTERFACE_MODE_RGMII_TXID:
1274 pad_mode = PAD_MODE_RGMII;
1275 break;
1276
1277 default:
1278 dev_err(dev->dev.parent, "unsupported phy mode %s\n",
1279 phy_modes(priv->phy_mode));
1280 return -EINVAL;
1281 }
1282
1283 nb8800_writeb(priv, NB8800_TANGOX_PAD_MODE, pad_mode);
1284
1285 return 0;
1286}
1287
1288static int nb8800_tangox_reset(struct net_device *dev)
1289{
1290 struct nb8800_priv *priv = netdev_priv(dev);
1291 int clk_div;
1292
1293 nb8800_writeb(priv, NB8800_TANGOX_RESET, 0);
1294 usleep_range(1000, 10000);
1295 nb8800_writeb(priv, NB8800_TANGOX_RESET, 1);
1296
1297 wmb(); /* ensure reset is cleared before proceeding */
1298
1299 clk_div = DIV_ROUND_UP(clk_get_rate(priv->clk), 2 * MAX_MDC_CLOCK);
1300 nb8800_writew(priv, NB8800_TANGOX_MDIO_CLKDIV, clk_div);
1301
1302 return 0;
1303}
1304
1305static const struct nb8800_ops nb8800_tangox_ops = {
1306 .init = nb8800_tangox_init,
1307 .reset = nb8800_tangox_reset,
1308};
1309
1310static int nb8800_tango4_init(struct net_device *dev)
1311{
1312 struct nb8800_priv *priv = netdev_priv(dev);
1313 int err;
1314
1315 err = nb8800_tangox_init(dev);
1316 if (err)
1317 return err;
1318
1319 /* On tango4 interrupt on DMA completion per frame works and gives
1320 * better performance despite generating more rx interrupts.
1321 */
1322
1323 /* Disable unnecessary interrupt on rx completion */
1324 nb8800_clearl(priv, NB8800_RXC_CR, RCR_RFI(7));
1325
1326 /* Request interrupt on descriptor DMA completion */
1327 priv->rx_dma_config |= DESC_ID;
1328
1329 return 0;
1330}
1331
1332static const struct nb8800_ops nb8800_tango4_ops = {
1333 .init = nb8800_tango4_init,
1334 .reset = nb8800_tangox_reset,
1335};
1336
1337static const struct of_device_id nb8800_dt_ids[] = {
1338 {
1339 .compatible = "aurora,nb8800",
1340 },
1341 {
1342 .compatible = "sigma,smp8642-ethernet",
1343 .data = &nb8800_tangox_ops,
1344 },
1345 {
1346 .compatible = "sigma,smp8734-ethernet",
1347 .data = &nb8800_tango4_ops,
1348 },
1349 { }
1350};
1351MODULE_DEVICE_TABLE(of, nb8800_dt_ids);
1352
1353static int nb8800_probe(struct platform_device *pdev)
1354{
1355 const struct of_device_id *match;
1356 const struct nb8800_ops *ops = NULL;
1357 struct nb8800_priv *priv;
1358 struct resource *res;
1359 struct net_device *dev;
1360 struct mii_bus *bus;
1361 const unsigned char *mac;
1362 void __iomem *base;
1363 int irq;
1364 int ret;
1365
1366 match = of_match_device(nb8800_dt_ids, &pdev->dev);
1367 if (match)
1368 ops = match->data;
1369
1370 irq = platform_get_irq(pdev, 0);
1371 if (irq <= 0) {
1372 dev_err(&pdev->dev, "No IRQ\n");
1373 return -EINVAL;
1374 }
1375
1376 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1377 base = devm_ioremap_resource(&pdev->dev, res);
1378 if (IS_ERR(base))
1379 return PTR_ERR(base);
1380
1381 dev_dbg(&pdev->dev, "AU-NB8800 Ethernet at %pa\n", &res->start);
1382
1383 dev = alloc_etherdev(sizeof(*priv));
1384 if (!dev)
1385 return -ENOMEM;
1386
1387 platform_set_drvdata(pdev, dev);
1388 SET_NETDEV_DEV(dev, &pdev->dev);
1389
1390 priv = netdev_priv(dev);
1391 priv->base = base;
1392
1393 priv->phy_mode = of_get_phy_mode(pdev->dev.of_node);
1394 if (priv->phy_mode < 0)
1395 priv->phy_mode = PHY_INTERFACE_MODE_RGMII;
1396
1397 priv->clk = devm_clk_get(&pdev->dev, NULL);
1398 if (IS_ERR(priv->clk)) {
1399 dev_err(&pdev->dev, "failed to get clock\n");
1400 ret = PTR_ERR(priv->clk);
1401 goto err_free_dev;
1402 }
1403
1404 ret = clk_prepare_enable(priv->clk);
1405 if (ret)
1406 goto err_free_dev;
1407
1408 spin_lock_init(&priv->tx_lock);
1409
1410 if (ops && ops->reset) {
1411 ret = ops->reset(dev);
1412 if (ret)
1413 goto err_disable_clk;
1414 }
1415
1416 bus = devm_mdiobus_alloc(&pdev->dev);
1417 if (!bus) {
1418 ret = -ENOMEM;
1419 goto err_disable_clk;
1420 }
1421
1422 bus->name = "nb8800-mii";
1423 bus->read = nb8800_mdio_read;
1424 bus->write = nb8800_mdio_write;
1425 bus->parent = &pdev->dev;
1426 snprintf(bus->id, MII_BUS_ID_SIZE, "%lx.nb8800-mii",
1427 (unsigned long)res->start);
1428 bus->priv = priv;
1429
1430 ret = of_mdiobus_register(bus, pdev->dev.of_node);
1431 if (ret) {
1432 dev_err(&pdev->dev, "failed to register MII bus\n");
1433 goto err_disable_clk;
1434 }
1435
1436 if (of_phy_is_fixed_link(pdev->dev.of_node)) {
1437 ret = of_phy_register_fixed_link(pdev->dev.of_node);
1438 if (ret < 0) {
1439 dev_err(&pdev->dev, "bad fixed-link spec\n");
1440 goto err_free_bus;
1441 }
1442 priv->phy_node = of_node_get(pdev->dev.of_node);
1443 }
1444
1445 if (!priv->phy_node)
1446 priv->phy_node = of_parse_phandle(pdev->dev.of_node,
1447 "phy-handle", 0);
1448
1449 if (!priv->phy_node) {
1450 dev_err(&pdev->dev, "no PHY specified\n");
1451 ret = -ENODEV;
1452 goto err_free_bus;
1453 }
1454
1455 priv->mii_bus = bus;
1456
1457 ret = nb8800_hw_init(dev);
1458 if (ret)
1459 goto err_deregister_fixed_link;
1460
1461 if (ops && ops->init) {
1462 ret = ops->init(dev);
1463 if (ret)
1464 goto err_deregister_fixed_link;
1465 }
1466
1467 dev->netdev_ops = &nb8800_netdev_ops;
1468 dev->ethtool_ops = &nb8800_ethtool_ops;
1469 dev->flags |= IFF_MULTICAST;
1470 dev->irq = irq;
1471
1472 mac = of_get_mac_address(pdev->dev.of_node);
1473 if (mac)
1474 ether_addr_copy(dev->dev_addr, mac);
1475
1476 if (!is_valid_ether_addr(dev->dev_addr))
1477 eth_hw_addr_random(dev);
1478
1479 nb8800_update_mac_addr(dev);
1480
1481 netif_carrier_off(dev);
1482
1483 ret = register_netdev(dev);
1484 if (ret) {
1485 netdev_err(dev, "failed to register netdev\n");
1486 goto err_free_dma;
1487 }
1488
1489 netif_napi_add(dev, &priv->napi, nb8800_poll, NAPI_POLL_WEIGHT);
1490
1491 netdev_info(dev, "MAC address %pM\n", dev->dev_addr);
1492
1493 return 0;
1494
1495err_free_dma:
1496 nb8800_dma_free(dev);
1497err_deregister_fixed_link:
1498 if (of_phy_is_fixed_link(pdev->dev.of_node))
1499 of_phy_deregister_fixed_link(pdev->dev.of_node);
1500err_free_bus:
1501 of_node_put(priv->phy_node);
1502 mdiobus_unregister(bus);
1503err_disable_clk:
1504 clk_disable_unprepare(priv->clk);
1505err_free_dev:
1506 free_netdev(dev);
1507
1508 return ret;
1509}
1510
1511static int nb8800_remove(struct platform_device *pdev)
1512{
1513 struct net_device *ndev = platform_get_drvdata(pdev);
1514 struct nb8800_priv *priv = netdev_priv(ndev);
1515
1516 unregister_netdev(ndev);
1517 if (of_phy_is_fixed_link(pdev->dev.of_node))
1518 of_phy_deregister_fixed_link(pdev->dev.of_node);
1519 of_node_put(priv->phy_node);
1520
1521 mdiobus_unregister(priv->mii_bus);
1522
1523 clk_disable_unprepare(priv->clk);
1524
1525 nb8800_dma_free(ndev);
1526 free_netdev(ndev);
1527
1528 return 0;
1529}
1530
1531static struct platform_driver nb8800_driver = {
1532 .driver = {
1533 .name = "nb8800",
1534 .of_match_table = nb8800_dt_ids,
1535 },
1536 .probe = nb8800_probe,
1537 .remove = nb8800_remove,
1538};
1539
1540module_platform_driver(nb8800_driver);
1541
1542MODULE_DESCRIPTION("Aurora AU-NB8800 Ethernet driver");
1543MODULE_AUTHOR("Mans Rullgard <mans@mansr.com>");
1544MODULE_LICENSE("GPL");