1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright Sunplus Technology Co., Ltd.
3  *       All rights reserved.
4  */
5 
6 #include <linux/platform_device.h>
7 #include <linux/nvmem-consumer.h>
8 #include <linux/etherdevice.h>
9 #include <linux/netdevice.h>
10 #include <linux/spinlock.h>
11 #include <linux/of_net.h>
12 #include <linux/reset.h>
13 #include <linux/clk.h>
14 #include <linux/of.h>
15 
16 #include "spl2sw_register.h"
17 #include "spl2sw_define.h"
18 #include "spl2sw_desc.h"
19 #include "spl2sw_mdio.h"
20 #include "spl2sw_phy.h"
21 #include "spl2sw_int.h"
22 #include "spl2sw_mac.h"
23 
24 /* net device operations */
25 static int spl2sw_ethernet_open(struct net_device *ndev)
26 {
27 	struct spl2sw_mac *mac = netdev_priv(ndev);
28 	struct spl2sw_common *comm = mac->comm;
29 	u32 mask;
30 
31 	netdev_dbg(ndev, "Open port = %x\n", mac->lan_port);
32 
33 	comm->enable |= mac->lan_port;
34 
35 	spl2sw_mac_hw_start(comm);
36 
37 	/* Enable TX and RX interrupts */
38 	mask = readl(comm->l2sw_reg_base + L2SW_SW_INT_MASK_0);
39 	mask &= ~(MAC_INT_TX | MAC_INT_RX);
40 	writel(mask, comm->l2sw_reg_base + L2SW_SW_INT_MASK_0);
41 
42 	phy_start(ndev->phydev);
43 
44 	netif_start_queue(ndev);
45 
46 	return 0;
47 }
48 
49 static int spl2sw_ethernet_stop(struct net_device *ndev)
50 {
51 	struct spl2sw_mac *mac = netdev_priv(ndev);
52 	struct spl2sw_common *comm = mac->comm;
53 
54 	netif_stop_queue(ndev);
55 
56 	comm->enable &= ~mac->lan_port;
57 
58 	phy_stop(ndev->phydev);
59 
60 	spl2sw_mac_hw_stop(comm);
61 
62 	return 0;
63 }
64 
65 static netdev_tx_t spl2sw_ethernet_start_xmit(struct sk_buff *skb,
66 					      struct net_device *ndev)
67 {
68 	struct spl2sw_mac *mac = netdev_priv(ndev);
69 	struct spl2sw_common *comm = mac->comm;
70 	struct spl2sw_skb_info *skbinfo;
71 	struct spl2sw_mac_desc *txdesc;
72 	unsigned long flags;
73 	u32 mapping;
74 	u32 tx_pos;
75 	u32 cmd1;
76 	u32 cmd2;
77 
78 	if (unlikely(comm->tx_desc_full == 1)) {
79 		/* No TX descriptors left. Wait for tx interrupt. */
80 		netdev_dbg(ndev, "TX descriptor queue full when xmit!\n");
81 		return NETDEV_TX_BUSY;
82 	}
83 
84 	/* If skb size is shorter than ETH_ZLEN (60), pad it with 0. */
85 	if (unlikely(skb->len < ETH_ZLEN)) {
86 		if (skb_padto(skb, ETH_ZLEN))
87 			return NETDEV_TX_OK;
88 
89 		skb_put(skb, ETH_ZLEN - skb->len);
90 	}
91 
92 	mapping = dma_map_single(&comm->pdev->dev, skb->data,
93 				 skb->len, DMA_TO_DEVICE);
94 	if (dma_mapping_error(&comm->pdev->dev, mapping)) {
95 		ndev->stats.tx_errors++;
96 		dev_kfree_skb(skb);
97 		return NETDEV_TX_OK;
98 	}
99 
100 	spin_lock_irqsave(&comm->tx_lock, flags);
101 
102 	tx_pos = comm->tx_pos;
103 	txdesc = &comm->tx_desc[tx_pos];
104 	skbinfo = &comm->tx_temp_skb_info[tx_pos];
105 	skbinfo->mapping = mapping;
106 	skbinfo->len = skb->len;
107 	skbinfo->skb = skb;
108 
109 	/* Set up a TX descriptor */
110 	cmd1 = TXD_OWN | TXD_SOP | TXD_EOP | (mac->to_vlan << 12) |
111 	       (skb->len & TXD_PKT_LEN);
112 	cmd2 = skb->len & TXD_BUF_LEN1;
113 
114 	if (tx_pos == (TX_DESC_NUM - 1))
115 		cmd2 |= TXD_EOR;
116 
117 	txdesc->addr1 = skbinfo->mapping;
118 	txdesc->cmd2 = cmd2;
119 	wmb();	/* Set TXD_OWN after other fields are effective. */
120 	txdesc->cmd1 = cmd1;
121 
122 	/* Move tx_pos to next position */
123 	tx_pos = ((tx_pos + 1) == TX_DESC_NUM) ? 0 : tx_pos + 1;
124 
125 	if (unlikely(tx_pos == comm->tx_done_pos)) {
126 		netif_stop_queue(ndev);
127 		comm->tx_desc_full = 1;
128 	}
129 	comm->tx_pos = tx_pos;
130 	wmb();		/* make sure settings are effective. */
131 
132 	/* Trigger mac to transmit */
133 	writel(MAC_TRIG_L_SOC0, comm->l2sw_reg_base + L2SW_CPU_TX_TRIG);
134 
135 	spin_unlock_irqrestore(&comm->tx_lock, flags);
136 	return NETDEV_TX_OK;
137 }
138 
139 static void spl2sw_ethernet_set_rx_mode(struct net_device *ndev)
140 {
141 	struct spl2sw_mac *mac = netdev_priv(ndev);
142 
143 	spl2sw_mac_rx_mode_set(mac);
144 }
145 
146 static int spl2sw_ethernet_set_mac_address(struct net_device *ndev, void *addr)
147 {
148 	struct spl2sw_mac *mac = netdev_priv(ndev);
149 	int err;
150 
151 	err = eth_mac_addr(ndev, addr);
152 	if (err)
153 		return err;
154 
155 	/* Delete the old MAC address */
156 	netdev_dbg(ndev, "Old Ethernet (MAC) address = %pM\n", mac->mac_addr);
157 	if (is_valid_ether_addr(mac->mac_addr)) {
158 		err = spl2sw_mac_addr_del(mac);
159 		if (err)
160 			return err;
161 	}
162 
163 	/* Set the MAC address */
164 	ether_addr_copy(mac->mac_addr, ndev->dev_addr);
165 	return spl2sw_mac_addr_add(mac);
166 }
167 
168 static void spl2sw_ethernet_tx_timeout(struct net_device *ndev, unsigned int txqueue)
169 {
170 	struct spl2sw_mac *mac = netdev_priv(ndev);
171 	struct spl2sw_common *comm = mac->comm;
172 	unsigned long flags;
173 	int i;
174 
175 	netdev_err(ndev, "TX timed out!\n");
176 	ndev->stats.tx_errors++;
177 
178 	spin_lock_irqsave(&comm->tx_lock, flags);
179 
180 	for (i = 0; i < MAX_NETDEV_NUM; i++)
181 		if (comm->ndev[i])
182 			netif_stop_queue(comm->ndev[i]);
183 
184 	spl2sw_mac_soft_reset(comm);
185 
186 	/* Accept TX packets again. */
187 	for (i = 0; i < MAX_NETDEV_NUM; i++)
188 		if (comm->ndev[i]) {
189 			netif_trans_update(comm->ndev[i]);
190 			netif_wake_queue(comm->ndev[i]);
191 		}
192 
193 	spin_unlock_irqrestore(&comm->tx_lock, flags);
194 }
195 
196 static const struct net_device_ops netdev_ops = {
197 	.ndo_open = spl2sw_ethernet_open,
198 	.ndo_stop = spl2sw_ethernet_stop,
199 	.ndo_start_xmit = spl2sw_ethernet_start_xmit,
200 	.ndo_set_rx_mode = spl2sw_ethernet_set_rx_mode,
201 	.ndo_set_mac_address = spl2sw_ethernet_set_mac_address,
202 	.ndo_do_ioctl = phy_do_ioctl,
203 	.ndo_tx_timeout = spl2sw_ethernet_tx_timeout,
204 };
205 
206 static void spl2sw_check_mac_vendor_id_and_convert(u8 *mac_addr)
207 {
208 	/* Byte order of MAC address of some samples are reversed.
209 	 * Check vendor id and convert byte order if it is wrong.
210 	 * OUI of Sunplus: fc:4b:bc
211 	 */
212 	if (mac_addr[5] == 0xfc && mac_addr[4] == 0x4b && mac_addr[3] == 0xbc &&
213 	    (mac_addr[0] != 0xfc || mac_addr[1] != 0x4b || mac_addr[2] != 0xbc)) {
214 
215 		swap(mac_addr[0], mac_addr[5]);
216 		swap(mac_addr[1], mac_addr[4]);
217 		swap(mac_addr[2], mac_addr[3]);
218 	}
219 }
220 
221 static int spl2sw_nvmem_get_mac_address(struct device *dev, struct device_node *np,
222 					void *addrbuf)
223 {
224 	struct nvmem_cell *cell;
225 	ssize_t len;
226 	u8 *mac;
227 
228 	/* Get nvmem cell of mac-address from dts. */
229 	cell = of_nvmem_cell_get(np, "mac-address");
230 	if (IS_ERR(cell))
231 		return PTR_ERR(cell);
232 
233 	/* Read mac address from nvmem cell. */
234 	mac = nvmem_cell_read(cell, &len);
235 	nvmem_cell_put(cell);
236 	if (IS_ERR(mac))
237 		return PTR_ERR(mac);
238 
239 	if (len != ETH_ALEN) {
240 		kfree(mac);
241 		dev_info(dev, "Invalid length of mac address in nvmem!\n");
242 		return -EINVAL;
243 	}
244 
245 	/* Byte order of some samples are reversed.
246 	 * Convert byte order here.
247 	 */
248 	spl2sw_check_mac_vendor_id_and_convert(mac);
249 
250 	/* Check if mac address is valid */
251 	if (!is_valid_ether_addr(mac)) {
252 		dev_info(dev, "Invalid mac address in nvmem (%pM)!\n", mac);
253 		kfree(mac);
254 		return -EINVAL;
255 	}
256 
257 	ether_addr_copy(addrbuf, mac);
258 	kfree(mac);
259 	return 0;
260 }
261 
262 static u32 spl2sw_init_netdev(struct platform_device *pdev, u8 *mac_addr,
263 			      struct net_device **r_ndev)
264 {
265 	struct net_device *ndev;
266 	struct spl2sw_mac *mac;
267 	int ret;
268 
269 	/* Allocate the devices, and also allocate spl2sw_mac,
270 	 * we can get it by netdev_priv().
271 	 */
272 	ndev = devm_alloc_etherdev(&pdev->dev, sizeof(*mac));
273 	if (!ndev) {
274 		*r_ndev = NULL;
275 		return -ENOMEM;
276 	}
277 	SET_NETDEV_DEV(ndev, &pdev->dev);
278 	ndev->netdev_ops = &netdev_ops;
279 	mac = netdev_priv(ndev);
280 	mac->ndev = ndev;
281 	ether_addr_copy(mac->mac_addr, mac_addr);
282 
283 	eth_hw_addr_set(ndev, mac_addr);
284 	dev_info(&pdev->dev, "Ethernet (MAC) address = %pM\n", mac_addr);
285 
286 	ret = register_netdev(ndev);
287 	if (ret) {
288 		dev_err(&pdev->dev, "Failed to register net device \"%s\"!\n",
289 			ndev->name);
290 		*r_ndev = NULL;
291 		return ret;
292 	}
293 	netdev_dbg(ndev, "Registered net device \"%s\" successfully.\n", ndev->name);
294 
295 	*r_ndev = ndev;
296 	return 0;
297 }
298 
299 static struct device_node *spl2sw_get_eth_child_node(struct device_node *ether_np, int id)
300 {
301 	struct device_node *port_np;
302 	int port_id;
303 
304 	for_each_child_of_node(ether_np, port_np) {
305 		/* It is not a 'port' node, continue. */
306 		if (strcmp(port_np->name, "port"))
307 			continue;
308 
309 		if (of_property_read_u32(port_np, "reg", &port_id) < 0)
310 			continue;
311 
312 		if (port_id == id)
313 			return port_np;
314 	}
315 
316 	/* Not found! */
317 	return NULL;
318 }
319 
320 static int spl2sw_probe(struct platform_device *pdev)
321 {
322 	struct device_node *eth_ports_np;
323 	struct device_node *port_np;
324 	struct spl2sw_common *comm;
325 	struct device_node *phy_np;
326 	phy_interface_t phy_mode;
327 	struct net_device *ndev;
328 	struct spl2sw_mac *mac;
329 	u8 mac_addr[ETH_ALEN];
330 	int irq, i, ret;
331 
332 	if (platform_get_drvdata(pdev))
333 		return -ENODEV;
334 
335 	/* Allocate memory for 'spl2sw_common' area. */
336 	comm = devm_kzalloc(&pdev->dev, sizeof(*comm), GFP_KERNEL);
337 	if (!comm)
338 		return -ENOMEM;
339 
340 	comm->pdev = pdev;
341 	platform_set_drvdata(pdev, comm);
342 
343 	spin_lock_init(&comm->tx_lock);
344 	spin_lock_init(&comm->mdio_lock);
345 	spin_lock_init(&comm->int_mask_lock);
346 
347 	/* Get memory resource 0 from dts. */
348 	comm->l2sw_reg_base = devm_platform_ioremap_resource(pdev, 0);
349 	if (IS_ERR(comm->l2sw_reg_base))
350 		return PTR_ERR(comm->l2sw_reg_base);
351 
352 	/* Get irq resource from dts. */
353 	ret = platform_get_irq(pdev, 0);
354 	if (ret < 0)
355 		return ret;
356 	irq = ret;
357 
358 	/* Get clock controller. */
359 	comm->clk = devm_clk_get(&pdev->dev, NULL);
360 	if (IS_ERR(comm->clk)) {
361 		dev_err_probe(&pdev->dev, PTR_ERR(comm->clk),
362 			      "Failed to retrieve clock controller!\n");
363 		return PTR_ERR(comm->clk);
364 	}
365 
366 	/* Get reset controller. */
367 	comm->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
368 	if (IS_ERR(comm->rstc)) {
369 		dev_err_probe(&pdev->dev, PTR_ERR(comm->rstc),
370 			      "Failed to retrieve reset controller!\n");
371 		return PTR_ERR(comm->rstc);
372 	}
373 
374 	/* Enable clock. */
375 	ret = clk_prepare_enable(comm->clk);
376 	if (ret)
377 		return ret;
378 	udelay(1);
379 
380 	/* Reset MAC */
381 	reset_control_assert(comm->rstc);
382 	udelay(1);
383 	reset_control_deassert(comm->rstc);
384 	usleep_range(1000, 2000);
385 
386 	/* Request irq. */
387 	ret = devm_request_irq(&pdev->dev, irq, spl2sw_ethernet_interrupt, 0,
388 			       dev_name(&pdev->dev), comm);
389 	if (ret) {
390 		dev_err(&pdev->dev, "Failed to request irq #%d!\n", irq);
391 		goto out_clk_disable;
392 	}
393 
394 	/* Initialize TX and RX descriptors. */
395 	ret = spl2sw_descs_init(comm);
396 	if (ret) {
397 		dev_err(&pdev->dev, "Fail to initialize mac descriptors!\n");
398 		spl2sw_descs_free(comm);
399 		goto out_clk_disable;
400 	}
401 
402 	/* Initialize MAC. */
403 	spl2sw_mac_init(comm);
404 
405 	/* Initialize mdio bus */
406 	ret = spl2sw_mdio_init(comm);
407 	if (ret) {
408 		dev_err(&pdev->dev, "Failed to initialize mdio bus!\n");
409 		goto out_clk_disable;
410 	}
411 
412 	/* Get child node ethernet-ports. */
413 	eth_ports_np = of_get_child_by_name(pdev->dev.of_node, "ethernet-ports");
414 	if (!eth_ports_np) {
415 		dev_err(&pdev->dev, "No ethernet-ports child node found!\n");
416 		ret = -ENODEV;
417 		goto out_free_mdio;
418 	}
419 
420 	for (i = 0; i < MAX_NETDEV_NUM; i++) {
421 		/* Get port@i of node ethernet-ports. */
422 		port_np = spl2sw_get_eth_child_node(eth_ports_np, i);
423 		if (!port_np)
424 			continue;
425 
426 		/* Get phy-mode. */
427 		if (of_get_phy_mode(port_np, &phy_mode)) {
428 			dev_err(&pdev->dev, "Failed to get phy-mode property of port@%d!\n",
429 				i);
430 			continue;
431 		}
432 
433 		/* Get phy-handle. */
434 		phy_np = of_parse_phandle(port_np, "phy-handle", 0);
435 		if (!phy_np) {
436 			dev_err(&pdev->dev, "Failed to get phy-handle property of port@%d!\n",
437 				i);
438 			continue;
439 		}
440 
441 		/* Get mac-address from nvmem. */
442 		ret = spl2sw_nvmem_get_mac_address(&pdev->dev, port_np, mac_addr);
443 		if (ret == -EPROBE_DEFER) {
444 			goto out_unregister_dev;
445 		} else if (ret) {
446 			dev_info(&pdev->dev, "Generate a random mac address!\n");
447 			eth_random_addr(mac_addr);
448 		}
449 
450 		/* Initialize the net device. */
451 		ret = spl2sw_init_netdev(pdev, mac_addr, &ndev);
452 		if (ret)
453 			goto out_unregister_dev;
454 
455 		ndev->irq = irq;
456 		comm->ndev[i] = ndev;
457 		mac = netdev_priv(ndev);
458 		mac->phy_node = phy_np;
459 		mac->phy_mode = phy_mode;
460 		mac->comm = comm;
461 
462 		mac->lan_port = 0x1 << i;	/* forward to port i */
463 		mac->to_vlan = 0x1 << i;	/* vlan group: i     */
464 		mac->vlan_id = i;		/* vlan group: i     */
465 
466 		/* Set MAC address */
467 		ret = spl2sw_mac_addr_add(mac);
468 		if (ret)
469 			goto out_unregister_dev;
470 
471 		spl2sw_mac_rx_mode_set(mac);
472 	}
473 
474 	/* Find first valid net device. */
475 	for (i = 0; i < MAX_NETDEV_NUM; i++) {
476 		if (comm->ndev[i])
477 			break;
478 	}
479 	if (i >= MAX_NETDEV_NUM) {
480 		dev_err(&pdev->dev, "No valid ethernet port!\n");
481 		ret = -ENODEV;
482 		goto out_free_mdio;
483 	}
484 
485 	/* Save first valid net device */
486 	ndev = comm->ndev[i];
487 
488 	ret = spl2sw_phy_connect(comm);
489 	if (ret) {
490 		netdev_err(ndev, "Failed to connect phy!\n");
491 		goto out_unregister_dev;
492 	}
493 
494 	/* Add and enable napi. */
495 	netif_napi_add(ndev, &comm->rx_napi, spl2sw_rx_poll);
496 	napi_enable(&comm->rx_napi);
497 	netif_napi_add_tx(ndev, &comm->tx_napi, spl2sw_tx_poll);
498 	napi_enable(&comm->tx_napi);
499 	return 0;
500 
501 out_unregister_dev:
502 	for (i = 0; i < MAX_NETDEV_NUM; i++)
503 		if (comm->ndev[i])
504 			unregister_netdev(comm->ndev[i]);
505 
506 out_free_mdio:
507 	spl2sw_mdio_remove(comm);
508 
509 out_clk_disable:
510 	clk_disable_unprepare(comm->clk);
511 	return ret;
512 }
513 
514 static int spl2sw_remove(struct platform_device *pdev)
515 {
516 	struct spl2sw_common *comm;
517 	int i;
518 
519 	comm = platform_get_drvdata(pdev);
520 
521 	spl2sw_phy_remove(comm);
522 
523 	/* Unregister and free net device. */
524 	for (i = 0; i < MAX_NETDEV_NUM; i++)
525 		if (comm->ndev[i])
526 			unregister_netdev(comm->ndev[i]);
527 
528 	comm->enable = 0;
529 	spl2sw_mac_hw_stop(comm);
530 	spl2sw_descs_free(comm);
531 
532 	/* Disable and delete napi. */
533 	napi_disable(&comm->rx_napi);
534 	netif_napi_del(&comm->rx_napi);
535 	napi_disable(&comm->tx_napi);
536 	netif_napi_del(&comm->tx_napi);
537 
538 	spl2sw_mdio_remove(comm);
539 
540 	clk_disable_unprepare(comm->clk);
541 
542 	return 0;
543 }
544 
545 static const struct of_device_id spl2sw_of_match[] = {
546 	{.compatible = "sunplus,sp7021-emac"},
547 	{ /* sentinel */ }
548 };
549 
550 MODULE_DEVICE_TABLE(of, spl2sw_of_match);
551 
552 static struct platform_driver spl2sw_driver = {
553 	.probe = spl2sw_probe,
554 	.remove = spl2sw_remove,
555 	.driver = {
556 		.name = "sp7021_emac",
557 		.of_match_table = spl2sw_of_match,
558 	},
559 };
560 
561 module_platform_driver(spl2sw_driver);
562 
563 MODULE_AUTHOR("Wells Lu <wellslutw@gmail.com>");
564 MODULE_DESCRIPTION("Sunplus Dual 10M/100M Ethernet driver");
565 MODULE_LICENSE("GPL");
566