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 */
spl2sw_ethernet_open(struct net_device * ndev)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
spl2sw_ethernet_stop(struct net_device * ndev)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
spl2sw_ethernet_start_xmit(struct sk_buff * skb,struct net_device * ndev)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
spl2sw_ethernet_set_rx_mode(struct net_device * ndev)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
spl2sw_ethernet_set_mac_address(struct net_device * ndev,void * addr)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
spl2sw_ethernet_tx_timeout(struct net_device * ndev,unsigned int txqueue)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
spl2sw_check_mac_vendor_id_and_convert(u8 * mac_addr)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
spl2sw_nvmem_get_mac_address(struct device * dev,struct device_node * np,void * addrbuf)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
spl2sw_init_netdev(struct platform_device * pdev,u8 * mac_addr,struct net_device ** r_ndev)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
spl2sw_get_eth_child_node(struct device_node * ether_np,int id)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
spl2sw_probe(struct platform_device * pdev)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
spl2sw_remove(struct platform_device * pdev)514 static void 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
543 static const struct of_device_id spl2sw_of_match[] = {
544 {.compatible = "sunplus,sp7021-emac"},
545 { /* sentinel */ }
546 };
547
548 MODULE_DEVICE_TABLE(of, spl2sw_of_match);
549
550 static struct platform_driver spl2sw_driver = {
551 .probe = spl2sw_probe,
552 .remove_new = spl2sw_remove,
553 .driver = {
554 .name = "sp7021_emac",
555 .of_match_table = spl2sw_of_match,
556 },
557 };
558
559 module_platform_driver(spl2sw_driver);
560
561 MODULE_AUTHOR("Wells Lu <wellslutw@gmail.com>");
562 MODULE_DESCRIPTION("Sunplus Dual 10M/100M Ethernet driver");
563 MODULE_LICENSE("GPL");
564