1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Lantiq / Intel PMAC driver for XRX200 SoCs
4 *
5 * Copyright (C) 2010 Lantiq Deutschland
6 * Copyright (C) 2012 John Crispin <john@phrozen.org>
7 * Copyright (C) 2017 - 2018 Hauke Mehrtens <hauke@hauke-m.de>
8 */
9
10 #include <linux/etherdevice.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/interrupt.h>
14 #include <linux/clk.h>
15 #include <linux/delay.h>
16
17 #include <linux/if_vlan.h>
18
19 #include <linux/of_net.h>
20 #include <linux/of_platform.h>
21
22 #include <xway_dma.h>
23
24 /* DMA */
25 #define XRX200_DMA_DATA_LEN (SZ_64K - 1)
26 #define XRX200_DMA_RX 0
27 #define XRX200_DMA_TX 1
28 #define XRX200_DMA_BURST_LEN 8
29
30 #define XRX200_DMA_PACKET_COMPLETE 0
31 #define XRX200_DMA_PACKET_IN_PROGRESS 1
32
33 /* cpu port mac */
34 #define PMAC_RX_IPG 0x0024
35 #define PMAC_RX_IPG_MASK 0xf
36
37 #define PMAC_HD_CTL 0x0000
38 /* Add Ethernet header to packets from DMA to PMAC */
39 #define PMAC_HD_CTL_ADD BIT(0)
40 /* Add VLAN tag to Packets from DMA to PMAC */
41 #define PMAC_HD_CTL_TAG BIT(1)
42 /* Add CRC to packets from DMA to PMAC */
43 #define PMAC_HD_CTL_AC BIT(2)
44 /* Add status header to packets from PMAC to DMA */
45 #define PMAC_HD_CTL_AS BIT(3)
46 /* Remove CRC from packets from PMAC to DMA */
47 #define PMAC_HD_CTL_RC BIT(4)
48 /* Remove Layer-2 header from packets from PMAC to DMA */
49 #define PMAC_HD_CTL_RL2 BIT(5)
50 /* Status header is present from DMA to PMAC */
51 #define PMAC_HD_CTL_RXSH BIT(6)
52 /* Add special tag from PMAC to switch */
53 #define PMAC_HD_CTL_AST BIT(7)
54 /* Remove specail Tag from PMAC to DMA */
55 #define PMAC_HD_CTL_RST BIT(8)
56 /* Check CRC from DMA to PMAC */
57 #define PMAC_HD_CTL_CCRC BIT(9)
58 /* Enable reaction to Pause frames in the PMAC */
59 #define PMAC_HD_CTL_FC BIT(10)
60
61 struct xrx200_chan {
62 int tx_free;
63
64 struct napi_struct napi;
65 struct ltq_dma_channel dma;
66
67 union {
68 struct sk_buff *skb[LTQ_DESC_NUM];
69 void *rx_buff[LTQ_DESC_NUM];
70 };
71
72 struct sk_buff *skb_head;
73 struct sk_buff *skb_tail;
74
75 struct xrx200_priv *priv;
76 };
77
78 struct xrx200_priv {
79 struct clk *clk;
80
81 struct xrx200_chan chan_tx;
82 struct xrx200_chan chan_rx;
83
84 u16 rx_buf_size;
85 u16 rx_skb_size;
86
87 struct net_device *net_dev;
88 struct device *dev;
89
90 __iomem void *pmac_reg;
91 };
92
xrx200_pmac_r32(struct xrx200_priv * priv,u32 offset)93 static u32 xrx200_pmac_r32(struct xrx200_priv *priv, u32 offset)
94 {
95 return __raw_readl(priv->pmac_reg + offset);
96 }
97
xrx200_pmac_w32(struct xrx200_priv * priv,u32 val,u32 offset)98 static void xrx200_pmac_w32(struct xrx200_priv *priv, u32 val, u32 offset)
99 {
100 __raw_writel(val, priv->pmac_reg + offset);
101 }
102
xrx200_pmac_mask(struct xrx200_priv * priv,u32 clear,u32 set,u32 offset)103 static void xrx200_pmac_mask(struct xrx200_priv *priv, u32 clear, u32 set,
104 u32 offset)
105 {
106 u32 val = xrx200_pmac_r32(priv, offset);
107
108 val &= ~(clear);
109 val |= set;
110 xrx200_pmac_w32(priv, val, offset);
111 }
112
xrx200_max_frame_len(int mtu)113 static int xrx200_max_frame_len(int mtu)
114 {
115 return VLAN_ETH_HLEN + mtu;
116 }
117
xrx200_buffer_size(int mtu)118 static int xrx200_buffer_size(int mtu)
119 {
120 return round_up(xrx200_max_frame_len(mtu), 4 * XRX200_DMA_BURST_LEN);
121 }
122
xrx200_skb_size(u16 buf_size)123 static int xrx200_skb_size(u16 buf_size)
124 {
125 return SKB_DATA_ALIGN(buf_size + NET_SKB_PAD + NET_IP_ALIGN) +
126 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
127 }
128
129 /* drop all the packets from the DMA ring */
xrx200_flush_dma(struct xrx200_chan * ch)130 static void xrx200_flush_dma(struct xrx200_chan *ch)
131 {
132 int i;
133
134 for (i = 0; i < LTQ_DESC_NUM; i++) {
135 struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
136
137 if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) != LTQ_DMA_C)
138 break;
139
140 desc->ctl = LTQ_DMA_OWN | LTQ_DMA_RX_OFFSET(NET_IP_ALIGN) |
141 ch->priv->rx_buf_size;
142 ch->dma.desc++;
143 ch->dma.desc %= LTQ_DESC_NUM;
144 }
145 }
146
xrx200_open(struct net_device * net_dev)147 static int xrx200_open(struct net_device *net_dev)
148 {
149 struct xrx200_priv *priv = netdev_priv(net_dev);
150
151 napi_enable(&priv->chan_tx.napi);
152 ltq_dma_open(&priv->chan_tx.dma);
153 ltq_dma_enable_irq(&priv->chan_tx.dma);
154
155 napi_enable(&priv->chan_rx.napi);
156 ltq_dma_open(&priv->chan_rx.dma);
157 /* The boot loader does not always deactivate the receiving of frames
158 * on the ports and then some packets queue up in the PPE buffers.
159 * They already passed the PMAC so they do not have the tags
160 * configured here. Read the these packets here and drop them.
161 * The HW should have written them into memory after 10us
162 */
163 usleep_range(20, 40);
164 xrx200_flush_dma(&priv->chan_rx);
165 ltq_dma_enable_irq(&priv->chan_rx.dma);
166
167 netif_wake_queue(net_dev);
168
169 return 0;
170 }
171
xrx200_close(struct net_device * net_dev)172 static int xrx200_close(struct net_device *net_dev)
173 {
174 struct xrx200_priv *priv = netdev_priv(net_dev);
175
176 netif_stop_queue(net_dev);
177
178 napi_disable(&priv->chan_rx.napi);
179 ltq_dma_close(&priv->chan_rx.dma);
180
181 napi_disable(&priv->chan_tx.napi);
182 ltq_dma_close(&priv->chan_tx.dma);
183
184 return 0;
185 }
186
xrx200_alloc_buf(struct xrx200_chan * ch,void * (* alloc)(unsigned int size))187 static int xrx200_alloc_buf(struct xrx200_chan *ch, void *(*alloc)(unsigned int size))
188 {
189 void *buf = ch->rx_buff[ch->dma.desc];
190 struct xrx200_priv *priv = ch->priv;
191 dma_addr_t mapping;
192 int ret = 0;
193
194 ch->rx_buff[ch->dma.desc] = alloc(priv->rx_skb_size);
195 if (!ch->rx_buff[ch->dma.desc]) {
196 ch->rx_buff[ch->dma.desc] = buf;
197 ret = -ENOMEM;
198 goto skip;
199 }
200
201 mapping = dma_map_single(priv->dev, ch->rx_buff[ch->dma.desc],
202 priv->rx_buf_size, DMA_FROM_DEVICE);
203 if (unlikely(dma_mapping_error(priv->dev, mapping))) {
204 skb_free_frag(ch->rx_buff[ch->dma.desc]);
205 ch->rx_buff[ch->dma.desc] = buf;
206 ret = -ENOMEM;
207 goto skip;
208 }
209
210 ch->dma.desc_base[ch->dma.desc].addr = mapping + NET_SKB_PAD + NET_IP_ALIGN;
211 /* Make sure the address is written before we give it to HW */
212 wmb();
213 skip:
214 ch->dma.desc_base[ch->dma.desc].ctl =
215 LTQ_DMA_OWN | LTQ_DMA_RX_OFFSET(NET_IP_ALIGN) | priv->rx_buf_size;
216
217 return ret;
218 }
219
xrx200_hw_receive(struct xrx200_chan * ch)220 static int xrx200_hw_receive(struct xrx200_chan *ch)
221 {
222 struct xrx200_priv *priv = ch->priv;
223 struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
224 void *buf = ch->rx_buff[ch->dma.desc];
225 u32 ctl = desc->ctl;
226 int len = (ctl & LTQ_DMA_SIZE_MASK);
227 struct net_device *net_dev = priv->net_dev;
228 struct sk_buff *skb;
229 int ret;
230
231 ret = xrx200_alloc_buf(ch, napi_alloc_frag);
232
233 ch->dma.desc++;
234 ch->dma.desc %= LTQ_DESC_NUM;
235
236 if (ret) {
237 net_dev->stats.rx_dropped++;
238 netdev_err(net_dev, "failed to allocate new rx buffer\n");
239 return ret;
240 }
241
242 skb = build_skb(buf, priv->rx_skb_size);
243 if (!skb) {
244 skb_free_frag(buf);
245 net_dev->stats.rx_dropped++;
246 return -ENOMEM;
247 }
248
249 skb_reserve(skb, NET_SKB_PAD);
250 skb_put(skb, len);
251
252 /* add buffers to skb via skb->frag_list */
253 if (ctl & LTQ_DMA_SOP) {
254 ch->skb_head = skb;
255 ch->skb_tail = skb;
256 skb_reserve(skb, NET_IP_ALIGN);
257 } else if (ch->skb_head) {
258 if (ch->skb_head == ch->skb_tail)
259 skb_shinfo(ch->skb_tail)->frag_list = skb;
260 else
261 ch->skb_tail->next = skb;
262 ch->skb_tail = skb;
263 ch->skb_head->len += skb->len;
264 ch->skb_head->data_len += skb->len;
265 ch->skb_head->truesize += skb->truesize;
266 }
267
268 if (ctl & LTQ_DMA_EOP) {
269 ch->skb_head->protocol = eth_type_trans(ch->skb_head, net_dev);
270 net_dev->stats.rx_packets++;
271 net_dev->stats.rx_bytes += ch->skb_head->len;
272 netif_receive_skb(ch->skb_head);
273 ch->skb_head = NULL;
274 ch->skb_tail = NULL;
275 ret = XRX200_DMA_PACKET_COMPLETE;
276 } else {
277 ret = XRX200_DMA_PACKET_IN_PROGRESS;
278 }
279
280 return ret;
281 }
282
xrx200_poll_rx(struct napi_struct * napi,int budget)283 static int xrx200_poll_rx(struct napi_struct *napi, int budget)
284 {
285 struct xrx200_chan *ch = container_of(napi,
286 struct xrx200_chan, napi);
287 int rx = 0;
288 int ret;
289
290 while (rx < budget) {
291 struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
292
293 if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) == LTQ_DMA_C) {
294 ret = xrx200_hw_receive(ch);
295 if (ret == XRX200_DMA_PACKET_IN_PROGRESS)
296 continue;
297 if (ret != XRX200_DMA_PACKET_COMPLETE)
298 break;
299 rx++;
300 } else {
301 break;
302 }
303 }
304
305 if (rx < budget) {
306 if (napi_complete_done(&ch->napi, rx))
307 ltq_dma_enable_irq(&ch->dma);
308 }
309
310 return rx;
311 }
312
xrx200_tx_housekeeping(struct napi_struct * napi,int budget)313 static int xrx200_tx_housekeeping(struct napi_struct *napi, int budget)
314 {
315 struct xrx200_chan *ch = container_of(napi,
316 struct xrx200_chan, napi);
317 struct net_device *net_dev = ch->priv->net_dev;
318 int pkts = 0;
319 int bytes = 0;
320
321 netif_tx_lock(net_dev);
322 while (pkts < budget) {
323 struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->tx_free];
324
325 if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) == LTQ_DMA_C) {
326 struct sk_buff *skb = ch->skb[ch->tx_free];
327
328 pkts++;
329 bytes += skb->len;
330 ch->skb[ch->tx_free] = NULL;
331 consume_skb(skb);
332 memset(&ch->dma.desc_base[ch->tx_free], 0,
333 sizeof(struct ltq_dma_desc));
334 ch->tx_free++;
335 ch->tx_free %= LTQ_DESC_NUM;
336 } else {
337 break;
338 }
339 }
340
341 net_dev->stats.tx_packets += pkts;
342 net_dev->stats.tx_bytes += bytes;
343 netdev_completed_queue(ch->priv->net_dev, pkts, bytes);
344
345 netif_tx_unlock(net_dev);
346 if (netif_queue_stopped(net_dev))
347 netif_wake_queue(net_dev);
348
349 if (pkts < budget) {
350 if (napi_complete_done(&ch->napi, pkts))
351 ltq_dma_enable_irq(&ch->dma);
352 }
353
354 return pkts;
355 }
356
xrx200_start_xmit(struct sk_buff * skb,struct net_device * net_dev)357 static netdev_tx_t xrx200_start_xmit(struct sk_buff *skb,
358 struct net_device *net_dev)
359 {
360 struct xrx200_priv *priv = netdev_priv(net_dev);
361 struct xrx200_chan *ch = &priv->chan_tx;
362 struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
363 u32 byte_offset;
364 dma_addr_t mapping;
365 int len;
366
367 skb->dev = net_dev;
368 if (skb_put_padto(skb, ETH_ZLEN)) {
369 net_dev->stats.tx_dropped++;
370 return NETDEV_TX_OK;
371 }
372
373 len = skb->len;
374
375 if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) || ch->skb[ch->dma.desc]) {
376 netdev_err(net_dev, "tx ring full\n");
377 netif_stop_queue(net_dev);
378 return NETDEV_TX_BUSY;
379 }
380
381 ch->skb[ch->dma.desc] = skb;
382
383 mapping = dma_map_single(priv->dev, skb->data, len, DMA_TO_DEVICE);
384 if (unlikely(dma_mapping_error(priv->dev, mapping)))
385 goto err_drop;
386
387 /* dma needs to start on a burst length value aligned address */
388 byte_offset = mapping % (XRX200_DMA_BURST_LEN * 4);
389
390 desc->addr = mapping - byte_offset;
391 /* Make sure the address is written before we give it to HW */
392 wmb();
393 desc->ctl = LTQ_DMA_OWN | LTQ_DMA_SOP | LTQ_DMA_EOP |
394 LTQ_DMA_TX_OFFSET(byte_offset) | (len & LTQ_DMA_SIZE_MASK);
395 ch->dma.desc++;
396 ch->dma.desc %= LTQ_DESC_NUM;
397 if (ch->dma.desc == ch->tx_free)
398 netif_stop_queue(net_dev);
399
400 netdev_sent_queue(net_dev, len);
401
402 return NETDEV_TX_OK;
403
404 err_drop:
405 dev_kfree_skb(skb);
406 net_dev->stats.tx_dropped++;
407 net_dev->stats.tx_errors++;
408 return NETDEV_TX_OK;
409 }
410
411 static int
xrx200_change_mtu(struct net_device * net_dev,int new_mtu)412 xrx200_change_mtu(struct net_device *net_dev, int new_mtu)
413 {
414 struct xrx200_priv *priv = netdev_priv(net_dev);
415 struct xrx200_chan *ch_rx = &priv->chan_rx;
416 int old_mtu = net_dev->mtu;
417 bool running = false;
418 void *buff;
419 int curr_desc;
420 int ret = 0;
421
422 net_dev->mtu = new_mtu;
423 priv->rx_buf_size = xrx200_buffer_size(new_mtu);
424 priv->rx_skb_size = xrx200_skb_size(priv->rx_buf_size);
425
426 if (new_mtu <= old_mtu)
427 return ret;
428
429 running = netif_running(net_dev);
430 if (running) {
431 napi_disable(&ch_rx->napi);
432 ltq_dma_close(&ch_rx->dma);
433 }
434
435 xrx200_poll_rx(&ch_rx->napi, LTQ_DESC_NUM);
436 curr_desc = ch_rx->dma.desc;
437
438 for (ch_rx->dma.desc = 0; ch_rx->dma.desc < LTQ_DESC_NUM;
439 ch_rx->dma.desc++) {
440 buff = ch_rx->rx_buff[ch_rx->dma.desc];
441 ret = xrx200_alloc_buf(ch_rx, netdev_alloc_frag);
442 if (ret) {
443 net_dev->mtu = old_mtu;
444 priv->rx_buf_size = xrx200_buffer_size(old_mtu);
445 priv->rx_skb_size = xrx200_skb_size(priv->rx_buf_size);
446 break;
447 }
448 skb_free_frag(buff);
449 }
450
451 ch_rx->dma.desc = curr_desc;
452 if (running) {
453 napi_enable(&ch_rx->napi);
454 ltq_dma_open(&ch_rx->dma);
455 ltq_dma_enable_irq(&ch_rx->dma);
456 }
457
458 return ret;
459 }
460
461 static const struct net_device_ops xrx200_netdev_ops = {
462 .ndo_open = xrx200_open,
463 .ndo_stop = xrx200_close,
464 .ndo_start_xmit = xrx200_start_xmit,
465 .ndo_change_mtu = xrx200_change_mtu,
466 .ndo_set_mac_address = eth_mac_addr,
467 .ndo_validate_addr = eth_validate_addr,
468 };
469
xrx200_dma_irq(int irq,void * ptr)470 static irqreturn_t xrx200_dma_irq(int irq, void *ptr)
471 {
472 struct xrx200_chan *ch = ptr;
473
474 if (napi_schedule_prep(&ch->napi)) {
475 ltq_dma_disable_irq(&ch->dma);
476 __napi_schedule(&ch->napi);
477 }
478
479 ltq_dma_ack_irq(&ch->dma);
480
481 return IRQ_HANDLED;
482 }
483
xrx200_dma_init(struct xrx200_priv * priv)484 static int xrx200_dma_init(struct xrx200_priv *priv)
485 {
486 struct xrx200_chan *ch_rx = &priv->chan_rx;
487 struct xrx200_chan *ch_tx = &priv->chan_tx;
488 int ret = 0;
489 int i;
490
491 ltq_dma_init_port(DMA_PORT_ETOP, XRX200_DMA_BURST_LEN,
492 XRX200_DMA_BURST_LEN);
493
494 ch_rx->dma.nr = XRX200_DMA_RX;
495 ch_rx->dma.dev = priv->dev;
496 ch_rx->priv = priv;
497
498 ltq_dma_alloc_rx(&ch_rx->dma);
499 for (ch_rx->dma.desc = 0; ch_rx->dma.desc < LTQ_DESC_NUM;
500 ch_rx->dma.desc++) {
501 ret = xrx200_alloc_buf(ch_rx, netdev_alloc_frag);
502 if (ret)
503 goto rx_free;
504 }
505 ch_rx->dma.desc = 0;
506 ret = devm_request_irq(priv->dev, ch_rx->dma.irq, xrx200_dma_irq, 0,
507 "xrx200_net_rx", &priv->chan_rx);
508 if (ret) {
509 dev_err(priv->dev, "failed to request RX irq %d\n",
510 ch_rx->dma.irq);
511 goto rx_ring_free;
512 }
513
514 ch_tx->dma.nr = XRX200_DMA_TX;
515 ch_tx->dma.dev = priv->dev;
516 ch_tx->priv = priv;
517
518 ltq_dma_alloc_tx(&ch_tx->dma);
519 ret = devm_request_irq(priv->dev, ch_tx->dma.irq, xrx200_dma_irq, 0,
520 "xrx200_net_tx", &priv->chan_tx);
521 if (ret) {
522 dev_err(priv->dev, "failed to request TX irq %d\n",
523 ch_tx->dma.irq);
524 goto tx_free;
525 }
526
527 return ret;
528
529 tx_free:
530 ltq_dma_free(&ch_tx->dma);
531
532 rx_ring_free:
533 /* free the allocated RX ring */
534 for (i = 0; i < LTQ_DESC_NUM; i++) {
535 if (priv->chan_rx.skb[i])
536 skb_free_frag(priv->chan_rx.rx_buff[i]);
537 }
538
539 rx_free:
540 ltq_dma_free(&ch_rx->dma);
541 return ret;
542 }
543
xrx200_hw_cleanup(struct xrx200_priv * priv)544 static void xrx200_hw_cleanup(struct xrx200_priv *priv)
545 {
546 int i;
547
548 ltq_dma_free(&priv->chan_tx.dma);
549 ltq_dma_free(&priv->chan_rx.dma);
550
551 /* free the allocated RX ring */
552 for (i = 0; i < LTQ_DESC_NUM; i++)
553 skb_free_frag(priv->chan_rx.rx_buff[i]);
554 }
555
xrx200_probe(struct platform_device * pdev)556 static int xrx200_probe(struct platform_device *pdev)
557 {
558 struct device *dev = &pdev->dev;
559 struct device_node *np = dev->of_node;
560 struct xrx200_priv *priv;
561 struct net_device *net_dev;
562 int err;
563
564 /* alloc the network device */
565 net_dev = devm_alloc_etherdev(dev, sizeof(struct xrx200_priv));
566 if (!net_dev)
567 return -ENOMEM;
568
569 priv = netdev_priv(net_dev);
570 priv->net_dev = net_dev;
571 priv->dev = dev;
572
573 net_dev->netdev_ops = &xrx200_netdev_ops;
574 SET_NETDEV_DEV(net_dev, dev);
575 net_dev->min_mtu = ETH_ZLEN;
576 net_dev->max_mtu = XRX200_DMA_DATA_LEN - xrx200_max_frame_len(0);
577 priv->rx_buf_size = xrx200_buffer_size(ETH_DATA_LEN);
578 priv->rx_skb_size = xrx200_skb_size(priv->rx_buf_size);
579
580 /* load the memory ranges */
581 priv->pmac_reg = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
582 if (IS_ERR(priv->pmac_reg))
583 return PTR_ERR(priv->pmac_reg);
584
585 priv->chan_rx.dma.irq = platform_get_irq_byname(pdev, "rx");
586 if (priv->chan_rx.dma.irq < 0)
587 return -ENOENT;
588 priv->chan_tx.dma.irq = platform_get_irq_byname(pdev, "tx");
589 if (priv->chan_tx.dma.irq < 0)
590 return -ENOENT;
591
592 /* get the clock */
593 priv->clk = devm_clk_get(dev, NULL);
594 if (IS_ERR(priv->clk)) {
595 dev_err(dev, "failed to get clock\n");
596 return PTR_ERR(priv->clk);
597 }
598
599 err = of_get_ethdev_address(np, net_dev);
600 if (err)
601 eth_hw_addr_random(net_dev);
602
603 /* bring up the dma engine and IP core */
604 err = xrx200_dma_init(priv);
605 if (err)
606 return err;
607
608 /* enable clock gate */
609 err = clk_prepare_enable(priv->clk);
610 if (err)
611 goto err_uninit_dma;
612
613 /* set IPG to 12 */
614 xrx200_pmac_mask(priv, PMAC_RX_IPG_MASK, 0xb, PMAC_RX_IPG);
615
616 /* enable status header, enable CRC */
617 xrx200_pmac_mask(priv, 0,
618 PMAC_HD_CTL_RST | PMAC_HD_CTL_AST | PMAC_HD_CTL_RXSH |
619 PMAC_HD_CTL_AS | PMAC_HD_CTL_AC | PMAC_HD_CTL_RC,
620 PMAC_HD_CTL);
621
622 /* setup NAPI */
623 netif_napi_add(net_dev, &priv->chan_rx.napi, xrx200_poll_rx);
624 netif_napi_add_tx(net_dev, &priv->chan_tx.napi,
625 xrx200_tx_housekeeping);
626
627 platform_set_drvdata(pdev, priv);
628
629 err = register_netdev(net_dev);
630 if (err)
631 goto err_unprepare_clk;
632
633 return 0;
634
635 err_unprepare_clk:
636 clk_disable_unprepare(priv->clk);
637
638 err_uninit_dma:
639 xrx200_hw_cleanup(priv);
640
641 return err;
642 }
643
xrx200_remove(struct platform_device * pdev)644 static int xrx200_remove(struct platform_device *pdev)
645 {
646 struct xrx200_priv *priv = platform_get_drvdata(pdev);
647 struct net_device *net_dev = priv->net_dev;
648
649 /* free stack related instances */
650 netif_stop_queue(net_dev);
651 netif_napi_del(&priv->chan_tx.napi);
652 netif_napi_del(&priv->chan_rx.napi);
653
654 /* remove the actual device */
655 unregister_netdev(net_dev);
656
657 /* release the clock */
658 clk_disable_unprepare(priv->clk);
659
660 /* shut down hardware */
661 xrx200_hw_cleanup(priv);
662
663 return 0;
664 }
665
666 static const struct of_device_id xrx200_match[] = {
667 { .compatible = "lantiq,xrx200-net" },
668 {},
669 };
670 MODULE_DEVICE_TABLE(of, xrx200_match);
671
672 static struct platform_driver xrx200_driver = {
673 .probe = xrx200_probe,
674 .remove = xrx200_remove,
675 .driver = {
676 .name = "lantiq,xrx200-net",
677 .of_match_table = xrx200_match,
678 },
679 };
680
681 module_platform_driver(xrx200_driver);
682
683 MODULE_AUTHOR("John Crispin <john@phrozen.org>");
684 MODULE_DESCRIPTION("Lantiq SoC XRX200 ethernet");
685 MODULE_LICENSE("GPL");
686