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