1 /* MOXA ART Ethernet (RTL8201CP) driver.
2  *
3  * Copyright (C) 2013 Jonas Jensen
4  *
5  * Jonas Jensen <jonas.jensen@gmail.com>
6  *
7  * Based on code from
8  * Moxa Technology Co., Ltd. <www.moxa.com>
9  *
10  * This file is licensed under the terms of the GNU General Public
11  * License version 2.  This program is licensed "as is" without any
12  * warranty of any kind, whether express or implied.
13  */
14 
15 #include <linux/module.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <linux/skbuff.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/ethtool.h>
21 #include <linux/platform_device.h>
22 #include <linux/interrupt.h>
23 #include <linux/irq.h>
24 #include <linux/of_address.h>
25 #include <linux/of_irq.h>
26 #include <linux/crc32.h>
27 #include <linux/crc32c.h>
28 #include <linux/circ_buf.h>
29 
30 #include "moxart_ether.h"
31 
moxart_desc_write(u32 data,__le32 * desc)32 static inline void moxart_desc_write(u32 data, __le32 *desc)
33 {
34 	*desc = cpu_to_le32(data);
35 }
36 
moxart_desc_read(__le32 * desc)37 static inline u32 moxart_desc_read(__le32 *desc)
38 {
39 	return le32_to_cpu(*desc);
40 }
41 
moxart_emac_write(struct net_device * ndev,unsigned int reg,unsigned long value)42 static inline void moxart_emac_write(struct net_device *ndev,
43 				     unsigned int reg, unsigned long value)
44 {
45 	struct moxart_mac_priv_t *priv = netdev_priv(ndev);
46 
47 	writel(value, priv->base + reg);
48 }
49 
moxart_update_mac_address(struct net_device * ndev)50 static void moxart_update_mac_address(struct net_device *ndev)
51 {
52 	moxart_emac_write(ndev, REG_MAC_MS_ADDRESS,
53 			  ((ndev->dev_addr[0] << 8) | (ndev->dev_addr[1])));
54 	moxart_emac_write(ndev, REG_MAC_MS_ADDRESS + 4,
55 			  ((ndev->dev_addr[2] << 24) |
56 			   (ndev->dev_addr[3] << 16) |
57 			   (ndev->dev_addr[4] << 8) |
58 			   (ndev->dev_addr[5])));
59 }
60 
moxart_set_mac_address(struct net_device * ndev,void * addr)61 static int moxart_set_mac_address(struct net_device *ndev, void *addr)
62 {
63 	struct sockaddr *address = addr;
64 
65 	eth_hw_addr_set(ndev, address->sa_data);
66 	moxart_update_mac_address(ndev);
67 
68 	return 0;
69 }
70 
moxart_mac_free_memory(struct net_device * ndev)71 static void moxart_mac_free_memory(struct net_device *ndev)
72 {
73 	struct moxart_mac_priv_t *priv = netdev_priv(ndev);
74 
75 	if (priv->tx_desc_base)
76 		dma_free_coherent(&priv->pdev->dev,
77 				  TX_REG_DESC_SIZE * TX_DESC_NUM,
78 				  priv->tx_desc_base, priv->tx_base);
79 
80 	if (priv->rx_desc_base)
81 		dma_free_coherent(&priv->pdev->dev,
82 				  RX_REG_DESC_SIZE * RX_DESC_NUM,
83 				  priv->rx_desc_base, priv->rx_base);
84 
85 	kfree(priv->tx_buf_base);
86 	kfree(priv->rx_buf_base);
87 }
88 
moxart_mac_reset(struct net_device * ndev)89 static void moxart_mac_reset(struct net_device *ndev)
90 {
91 	struct moxart_mac_priv_t *priv = netdev_priv(ndev);
92 
93 	writel(SW_RST, priv->base + REG_MAC_CTRL);
94 	while (readl(priv->base + REG_MAC_CTRL) & SW_RST)
95 		mdelay(10);
96 
97 	writel(0, priv->base + REG_INTERRUPT_MASK);
98 
99 	priv->reg_maccr = RX_BROADPKT | FULLDUP | CRC_APD | RX_FTL;
100 }
101 
moxart_mac_enable(struct net_device * ndev)102 static void moxart_mac_enable(struct net_device *ndev)
103 {
104 	struct moxart_mac_priv_t *priv = netdev_priv(ndev);
105 
106 	writel(0x00001010, priv->base + REG_INT_TIMER_CTRL);
107 	writel(0x00000001, priv->base + REG_APOLL_TIMER_CTRL);
108 	writel(0x00000390, priv->base + REG_DMA_BLEN_CTRL);
109 
110 	priv->reg_imr |= (RPKT_FINISH_M | XPKT_FINISH_M);
111 	writel(priv->reg_imr, priv->base + REG_INTERRUPT_MASK);
112 
113 	priv->reg_maccr |= (RCV_EN | XMT_EN | RDMA_EN | XDMA_EN);
114 	writel(priv->reg_maccr, priv->base + REG_MAC_CTRL);
115 }
116 
moxart_mac_setup_desc_ring(struct net_device * ndev)117 static void moxart_mac_setup_desc_ring(struct net_device *ndev)
118 {
119 	struct moxart_mac_priv_t *priv = netdev_priv(ndev);
120 	void *desc;
121 	int i;
122 
123 	for (i = 0; i < TX_DESC_NUM; i++) {
124 		desc = priv->tx_desc_base + i * TX_REG_DESC_SIZE;
125 		memset(desc, 0, TX_REG_DESC_SIZE);
126 
127 		priv->tx_buf[i] = priv->tx_buf_base + priv->tx_buf_size * i;
128 	}
129 	moxart_desc_write(TX_DESC1_END, desc + TX_REG_OFFSET_DESC1);
130 
131 	priv->tx_head = 0;
132 	priv->tx_tail = 0;
133 
134 	for (i = 0; i < RX_DESC_NUM; i++) {
135 		desc = priv->rx_desc_base + i * RX_REG_DESC_SIZE;
136 		memset(desc, 0, RX_REG_DESC_SIZE);
137 		moxart_desc_write(RX_DESC0_DMA_OWN, desc + RX_REG_OFFSET_DESC0);
138 		moxart_desc_write(RX_BUF_SIZE & RX_DESC1_BUF_SIZE_MASK,
139 		       desc + RX_REG_OFFSET_DESC1);
140 
141 		priv->rx_buf[i] = priv->rx_buf_base + priv->rx_buf_size * i;
142 		priv->rx_mapping[i] = dma_map_single(&priv->pdev->dev,
143 						     priv->rx_buf[i],
144 						     priv->rx_buf_size,
145 						     DMA_FROM_DEVICE);
146 		if (dma_mapping_error(&priv->pdev->dev, priv->rx_mapping[i]))
147 			netdev_err(ndev, "DMA mapping error\n");
148 
149 		moxart_desc_write(priv->rx_mapping[i],
150 		       desc + RX_REG_OFFSET_DESC2 + RX_DESC2_ADDRESS_PHYS);
151 		moxart_desc_write((uintptr_t)priv->rx_buf[i],
152 		       desc + RX_REG_OFFSET_DESC2 + RX_DESC2_ADDRESS_VIRT);
153 	}
154 	moxart_desc_write(RX_DESC1_END, desc + RX_REG_OFFSET_DESC1);
155 
156 	priv->rx_head = 0;
157 
158 	/* reset the MAC controller TX/RX descriptor base address */
159 	writel(priv->tx_base, priv->base + REG_TXR_BASE_ADDRESS);
160 	writel(priv->rx_base, priv->base + REG_RXR_BASE_ADDRESS);
161 }
162 
moxart_mac_open(struct net_device * ndev)163 static int moxart_mac_open(struct net_device *ndev)
164 {
165 	struct moxart_mac_priv_t *priv = netdev_priv(ndev);
166 
167 	napi_enable(&priv->napi);
168 
169 	moxart_mac_reset(ndev);
170 	moxart_update_mac_address(ndev);
171 	moxart_mac_setup_desc_ring(ndev);
172 	moxart_mac_enable(ndev);
173 	netif_start_queue(ndev);
174 
175 	netdev_dbg(ndev, "%s: IMR=0x%x, MACCR=0x%x\n",
176 		   __func__, readl(priv->base + REG_INTERRUPT_MASK),
177 		   readl(priv->base + REG_MAC_CTRL));
178 
179 	return 0;
180 }
181 
moxart_mac_stop(struct net_device * ndev)182 static int moxart_mac_stop(struct net_device *ndev)
183 {
184 	struct moxart_mac_priv_t *priv = netdev_priv(ndev);
185 	int i;
186 
187 	napi_disable(&priv->napi);
188 
189 	netif_stop_queue(ndev);
190 
191 	/* disable all interrupts */
192 	writel(0, priv->base + REG_INTERRUPT_MASK);
193 
194 	/* disable all functions */
195 	writel(0, priv->base + REG_MAC_CTRL);
196 
197 	/* unmap areas mapped in moxart_mac_setup_desc_ring() */
198 	for (i = 0; i < RX_DESC_NUM; i++)
199 		dma_unmap_single(&priv->pdev->dev, priv->rx_mapping[i],
200 				 priv->rx_buf_size, DMA_FROM_DEVICE);
201 
202 	return 0;
203 }
204 
moxart_rx_poll(struct napi_struct * napi,int budget)205 static int moxart_rx_poll(struct napi_struct *napi, int budget)
206 {
207 	struct moxart_mac_priv_t *priv = container_of(napi,
208 						      struct moxart_mac_priv_t,
209 						      napi);
210 	struct net_device *ndev = priv->ndev;
211 	struct sk_buff *skb;
212 	void *desc;
213 	unsigned int desc0, len;
214 	int rx_head = priv->rx_head;
215 	int rx = 0;
216 
217 	while (rx < budget) {
218 		desc = priv->rx_desc_base + (RX_REG_DESC_SIZE * rx_head);
219 		desc0 = moxart_desc_read(desc + RX_REG_OFFSET_DESC0);
220 		rmb(); /* ensure desc0 is up to date */
221 
222 		if (desc0 & RX_DESC0_DMA_OWN)
223 			break;
224 
225 		if (desc0 & (RX_DESC0_ERR | RX_DESC0_CRC_ERR | RX_DESC0_FTL |
226 			     RX_DESC0_RUNT | RX_DESC0_ODD_NB)) {
227 			net_dbg_ratelimited("packet error\n");
228 			ndev->stats.rx_dropped++;
229 			ndev->stats.rx_errors++;
230 			goto rx_next;
231 		}
232 
233 		len = desc0 & RX_DESC0_FRAME_LEN_MASK;
234 
235 		if (len > RX_BUF_SIZE)
236 			len = RX_BUF_SIZE;
237 
238 		dma_sync_single_for_cpu(&priv->pdev->dev,
239 					priv->rx_mapping[rx_head],
240 					priv->rx_buf_size, DMA_FROM_DEVICE);
241 		skb = netdev_alloc_skb_ip_align(ndev, len);
242 
243 		if (unlikely(!skb)) {
244 			net_dbg_ratelimited("netdev_alloc_skb_ip_align failed\n");
245 			ndev->stats.rx_dropped++;
246 			ndev->stats.rx_errors++;
247 			goto rx_next;
248 		}
249 
250 		memcpy(skb->data, priv->rx_buf[rx_head], len);
251 		skb_put(skb, len);
252 		skb->protocol = eth_type_trans(skb, ndev);
253 		napi_gro_receive(&priv->napi, skb);
254 		rx++;
255 
256 		ndev->stats.rx_packets++;
257 		ndev->stats.rx_bytes += len;
258 		if (desc0 & RX_DESC0_MULTICAST)
259 			ndev->stats.multicast++;
260 
261 rx_next:
262 		wmb(); /* prevent setting ownership back too early */
263 		moxart_desc_write(RX_DESC0_DMA_OWN, desc + RX_REG_OFFSET_DESC0);
264 
265 		rx_head = RX_NEXT(rx_head);
266 		priv->rx_head = rx_head;
267 	}
268 
269 	if (rx < budget)
270 		napi_complete_done(napi, rx);
271 
272 	priv->reg_imr |= RPKT_FINISH_M;
273 	writel(priv->reg_imr, priv->base + REG_INTERRUPT_MASK);
274 
275 	return rx;
276 }
277 
moxart_tx_queue_space(struct net_device * ndev)278 static int moxart_tx_queue_space(struct net_device *ndev)
279 {
280 	struct moxart_mac_priv_t *priv = netdev_priv(ndev);
281 
282 	return CIRC_SPACE(priv->tx_head, priv->tx_tail, TX_DESC_NUM);
283 }
284 
moxart_tx_finished(struct net_device * ndev)285 static void moxart_tx_finished(struct net_device *ndev)
286 {
287 	struct moxart_mac_priv_t *priv = netdev_priv(ndev);
288 	unsigned int tx_head = priv->tx_head;
289 	unsigned int tx_tail = priv->tx_tail;
290 
291 	while (tx_tail != tx_head) {
292 		dma_unmap_single(&priv->pdev->dev, priv->tx_mapping[tx_tail],
293 				 priv->tx_len[tx_tail], DMA_TO_DEVICE);
294 
295 		ndev->stats.tx_packets++;
296 		ndev->stats.tx_bytes += priv->tx_skb[tx_tail]->len;
297 
298 		dev_consume_skb_irq(priv->tx_skb[tx_tail]);
299 		priv->tx_skb[tx_tail] = NULL;
300 
301 		tx_tail = TX_NEXT(tx_tail);
302 	}
303 	priv->tx_tail = tx_tail;
304 	if (netif_queue_stopped(ndev) &&
305 	    moxart_tx_queue_space(ndev) >= TX_WAKE_THRESHOLD)
306 		netif_wake_queue(ndev);
307 }
308 
moxart_mac_interrupt(int irq,void * dev_id)309 static irqreturn_t moxart_mac_interrupt(int irq, void *dev_id)
310 {
311 	struct net_device *ndev = (struct net_device *)dev_id;
312 	struct moxart_mac_priv_t *priv = netdev_priv(ndev);
313 	unsigned int ists = readl(priv->base + REG_INTERRUPT_STATUS);
314 
315 	if (ists & XPKT_OK_INT_STS)
316 		moxart_tx_finished(ndev);
317 
318 	if (ists & RPKT_FINISH) {
319 		if (napi_schedule_prep(&priv->napi)) {
320 			priv->reg_imr &= ~RPKT_FINISH_M;
321 			writel(priv->reg_imr, priv->base + REG_INTERRUPT_MASK);
322 			__napi_schedule(&priv->napi);
323 		}
324 	}
325 
326 	return IRQ_HANDLED;
327 }
328 
moxart_mac_start_xmit(struct sk_buff * skb,struct net_device * ndev)329 static netdev_tx_t moxart_mac_start_xmit(struct sk_buff *skb,
330 					 struct net_device *ndev)
331 {
332 	struct moxart_mac_priv_t *priv = netdev_priv(ndev);
333 	void *desc;
334 	unsigned int len;
335 	unsigned int tx_head;
336 	u32 txdes1;
337 	netdev_tx_t ret = NETDEV_TX_BUSY;
338 
339 	spin_lock_irq(&priv->txlock);
340 
341 	tx_head = priv->tx_head;
342 	desc = priv->tx_desc_base + (TX_REG_DESC_SIZE * tx_head);
343 
344 	if (moxart_tx_queue_space(ndev) == 1)
345 		netif_stop_queue(ndev);
346 
347 	if (moxart_desc_read(desc + TX_REG_OFFSET_DESC0) & TX_DESC0_DMA_OWN) {
348 		net_dbg_ratelimited("no TX space for packet\n");
349 		ndev->stats.tx_dropped++;
350 		goto out_unlock;
351 	}
352 	rmb(); /* ensure data is only read that had TX_DESC0_DMA_OWN cleared */
353 
354 	len = skb->len > TX_BUF_SIZE ? TX_BUF_SIZE : skb->len;
355 
356 	priv->tx_mapping[tx_head] = dma_map_single(&priv->pdev->dev, skb->data,
357 						   len, DMA_TO_DEVICE);
358 	if (dma_mapping_error(&priv->pdev->dev, priv->tx_mapping[tx_head])) {
359 		netdev_err(ndev, "DMA mapping error\n");
360 		goto out_unlock;
361 	}
362 
363 	priv->tx_len[tx_head] = len;
364 	priv->tx_skb[tx_head] = skb;
365 
366 	moxart_desc_write(priv->tx_mapping[tx_head],
367 	       desc + TX_REG_OFFSET_DESC2 + TX_DESC2_ADDRESS_PHYS);
368 	moxart_desc_write((uintptr_t)skb->data,
369 	       desc + TX_REG_OFFSET_DESC2 + TX_DESC2_ADDRESS_VIRT);
370 
371 	if (skb->len < ETH_ZLEN) {
372 		memset(&skb->data[skb->len],
373 		       0, ETH_ZLEN - skb->len);
374 		len = ETH_ZLEN;
375 	}
376 
377 	dma_sync_single_for_device(&priv->pdev->dev, priv->tx_mapping[tx_head],
378 				   priv->tx_buf_size, DMA_TO_DEVICE);
379 
380 	txdes1 = TX_DESC1_LTS | TX_DESC1_FTS | (len & TX_DESC1_BUF_SIZE_MASK);
381 	if (tx_head == TX_DESC_NUM_MASK)
382 		txdes1 |= TX_DESC1_END;
383 	moxart_desc_write(txdes1, desc + TX_REG_OFFSET_DESC1);
384 	wmb(); /* flush descriptor before transferring ownership */
385 	moxart_desc_write(TX_DESC0_DMA_OWN, desc + TX_REG_OFFSET_DESC0);
386 
387 	/* start to send packet */
388 	writel(0xffffffff, priv->base + REG_TX_POLL_DEMAND);
389 
390 	priv->tx_head = TX_NEXT(tx_head);
391 
392 	netif_trans_update(ndev);
393 	ret = NETDEV_TX_OK;
394 out_unlock:
395 	spin_unlock_irq(&priv->txlock);
396 
397 	return ret;
398 }
399 
moxart_mac_setmulticast(struct net_device * ndev)400 static void moxart_mac_setmulticast(struct net_device *ndev)
401 {
402 	struct moxart_mac_priv_t *priv = netdev_priv(ndev);
403 	struct netdev_hw_addr *ha;
404 	int crc_val;
405 
406 	netdev_for_each_mc_addr(ha, ndev) {
407 		crc_val = crc32_le(~0, ha->addr, ETH_ALEN);
408 		crc_val = (crc_val >> 26) & 0x3f;
409 		if (crc_val >= 32) {
410 			writel(readl(priv->base + REG_MCAST_HASH_TABLE1) |
411 			       (1UL << (crc_val - 32)),
412 			       priv->base + REG_MCAST_HASH_TABLE1);
413 		} else {
414 			writel(readl(priv->base + REG_MCAST_HASH_TABLE0) |
415 			       (1UL << crc_val),
416 			       priv->base + REG_MCAST_HASH_TABLE0);
417 		}
418 	}
419 }
420 
moxart_mac_set_rx_mode(struct net_device * ndev)421 static void moxart_mac_set_rx_mode(struct net_device *ndev)
422 {
423 	struct moxart_mac_priv_t *priv = netdev_priv(ndev);
424 
425 	spin_lock_irq(&priv->txlock);
426 
427 	(ndev->flags & IFF_PROMISC) ? (priv->reg_maccr |= RCV_ALL) :
428 				      (priv->reg_maccr &= ~RCV_ALL);
429 
430 	(ndev->flags & IFF_ALLMULTI) ? (priv->reg_maccr |= RX_MULTIPKT) :
431 				       (priv->reg_maccr &= ~RX_MULTIPKT);
432 
433 	if ((ndev->flags & IFF_MULTICAST) && netdev_mc_count(ndev)) {
434 		priv->reg_maccr |= HT_MULTI_EN;
435 		moxart_mac_setmulticast(ndev);
436 	} else {
437 		priv->reg_maccr &= ~HT_MULTI_EN;
438 	}
439 
440 	writel(priv->reg_maccr, priv->base + REG_MAC_CTRL);
441 
442 	spin_unlock_irq(&priv->txlock);
443 }
444 
445 static const struct net_device_ops moxart_netdev_ops = {
446 	.ndo_open		= moxart_mac_open,
447 	.ndo_stop		= moxart_mac_stop,
448 	.ndo_start_xmit		= moxart_mac_start_xmit,
449 	.ndo_set_rx_mode	= moxart_mac_set_rx_mode,
450 	.ndo_set_mac_address	= moxart_set_mac_address,
451 	.ndo_validate_addr	= eth_validate_addr,
452 };
453 
moxart_mac_probe(struct platform_device * pdev)454 static int moxart_mac_probe(struct platform_device *pdev)
455 {
456 	struct device *p_dev = &pdev->dev;
457 	struct device_node *node = p_dev->of_node;
458 	struct net_device *ndev;
459 	struct moxart_mac_priv_t *priv;
460 	struct resource *res;
461 	unsigned int irq;
462 	int ret;
463 
464 	ndev = alloc_etherdev(sizeof(struct moxart_mac_priv_t));
465 	if (!ndev)
466 		return -ENOMEM;
467 
468 	irq = irq_of_parse_and_map(node, 0);
469 	if (irq <= 0) {
470 		netdev_err(ndev, "irq_of_parse_and_map failed\n");
471 		ret = -EINVAL;
472 		goto irq_map_fail;
473 	}
474 
475 	priv = netdev_priv(ndev);
476 	priv->ndev = ndev;
477 	priv->pdev = pdev;
478 
479 	priv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
480 	if (IS_ERR(priv->base)) {
481 		ret = PTR_ERR(priv->base);
482 		goto init_fail;
483 	}
484 	ndev->base_addr = res->start;
485 
486 	ret = platform_get_ethdev_address(p_dev, ndev);
487 	if (ret == -EPROBE_DEFER)
488 		goto init_fail;
489 	if (ret)
490 		eth_hw_addr_random(ndev);
491 	moxart_update_mac_address(ndev);
492 
493 	spin_lock_init(&priv->txlock);
494 
495 	priv->tx_buf_size = TX_BUF_SIZE;
496 	priv->rx_buf_size = RX_BUF_SIZE;
497 
498 	priv->tx_desc_base = dma_alloc_coherent(p_dev, TX_REG_DESC_SIZE *
499 						TX_DESC_NUM, &priv->tx_base,
500 						GFP_DMA | GFP_KERNEL);
501 	if (!priv->tx_desc_base) {
502 		ret = -ENOMEM;
503 		goto init_fail;
504 	}
505 
506 	priv->rx_desc_base = dma_alloc_coherent(p_dev, RX_REG_DESC_SIZE *
507 						RX_DESC_NUM, &priv->rx_base,
508 						GFP_DMA | GFP_KERNEL);
509 	if (!priv->rx_desc_base) {
510 		ret = -ENOMEM;
511 		goto init_fail;
512 	}
513 
514 	priv->tx_buf_base = kmalloc_array(priv->tx_buf_size, TX_DESC_NUM,
515 					  GFP_KERNEL);
516 	if (!priv->tx_buf_base) {
517 		ret = -ENOMEM;
518 		goto init_fail;
519 	}
520 
521 	priv->rx_buf_base = kmalloc_array(priv->rx_buf_size, RX_DESC_NUM,
522 					  GFP_KERNEL);
523 	if (!priv->rx_buf_base) {
524 		ret = -ENOMEM;
525 		goto init_fail;
526 	}
527 
528 	platform_set_drvdata(pdev, ndev);
529 
530 	ret = devm_request_irq(p_dev, irq, moxart_mac_interrupt, 0,
531 			       pdev->name, ndev);
532 	if (ret) {
533 		netdev_err(ndev, "devm_request_irq failed\n");
534 		goto init_fail;
535 	}
536 
537 	ndev->netdev_ops = &moxart_netdev_ops;
538 	netif_napi_add_weight(ndev, &priv->napi, moxart_rx_poll, RX_DESC_NUM);
539 	ndev->priv_flags |= IFF_UNICAST_FLT;
540 	ndev->irq = irq;
541 
542 	SET_NETDEV_DEV(ndev, &pdev->dev);
543 
544 	ret = register_netdev(ndev);
545 	if (ret)
546 		goto init_fail;
547 
548 	netdev_dbg(ndev, "%s: IRQ=%d address=%pM\n",
549 		   __func__, ndev->irq, ndev->dev_addr);
550 
551 	return 0;
552 
553 init_fail:
554 	netdev_err(ndev, "init failed\n");
555 	moxart_mac_free_memory(ndev);
556 irq_map_fail:
557 	free_netdev(ndev);
558 	return ret;
559 }
560 
moxart_remove(struct platform_device * pdev)561 static int moxart_remove(struct platform_device *pdev)
562 {
563 	struct net_device *ndev = platform_get_drvdata(pdev);
564 
565 	unregister_netdev(ndev);
566 	devm_free_irq(&pdev->dev, ndev->irq, ndev);
567 	moxart_mac_free_memory(ndev);
568 	free_netdev(ndev);
569 
570 	return 0;
571 }
572 
573 static const struct of_device_id moxart_mac_match[] = {
574 	{ .compatible = "moxa,moxart-mac" },
575 	{ }
576 };
577 MODULE_DEVICE_TABLE(of, moxart_mac_match);
578 
579 static struct platform_driver moxart_mac_driver = {
580 	.probe	= moxart_mac_probe,
581 	.remove	= moxart_remove,
582 	.driver	= {
583 		.name		= "moxart-ethernet",
584 		.of_match_table	= moxart_mac_match,
585 	},
586 };
587 module_platform_driver(moxart_mac_driver);
588 
589 MODULE_DESCRIPTION("MOXART RTL8201CP Ethernet driver");
590 MODULE_LICENSE("GPL v2");
591 MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");
592