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1/*
2 * This program is free software; you can redistribute it and/or modify it
3 * under the terms of the GNU General Public License version 2 as published
4 * by the Free Software Foundation.
5 *
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9 * GNU General Public License for more details.
10 *
11 * You should have received a copy of the GNU General Public License
12 * along with this program; if not, see <http://www.gnu.org/licenses/>.
13 *
14 * Copyright (C) 2011 John Crispin <blogic@openwrt.org>
15 */
16
17#include <linux/kernel.h>
18#include <linux/slab.h>
19#include <linux/errno.h>
20#include <linux/types.h>
21#include <linux/interrupt.h>
22#include <linux/uaccess.h>
23#include <linux/in.h>
24#include <linux/netdevice.h>
25#include <linux/etherdevice.h>
26#include <linux/phy.h>
27#include <linux/ip.h>
28#include <linux/tcp.h>
29#include <linux/skbuff.h>
30#include <linux/mm.h>
31#include <linux/platform_device.h>
32#include <linux/ethtool.h>
33#include <linux/init.h>
34#include <linux/delay.h>
35#include <linux/io.h>
36#include <linux/dma-mapping.h>
37#include <linux/module.h>
38
39#include <asm/checksum.h>
40
41#include <lantiq_soc.h>
42#include <xway_dma.h>
43#include <lantiq_platform.h>
44
45#define LTQ_ETOP_MDIO 0x11804
46#define MDIO_REQUEST 0x80000000
47#define MDIO_READ 0x40000000
48#define MDIO_ADDR_MASK 0x1f
49#define MDIO_ADDR_OFFSET 0x15
50#define MDIO_REG_MASK 0x1f
51#define MDIO_REG_OFFSET 0x10
52#define MDIO_VAL_MASK 0xffff
53
54#define PPE32_CGEN 0x800
55#define LQ_PPE32_ENET_MAC_CFG 0x1840
56
57#define LTQ_ETOP_ENETS0 0x11850
58#define LTQ_ETOP_MAC_DA0 0x1186C
59#define LTQ_ETOP_MAC_DA1 0x11870
60#define LTQ_ETOP_CFG 0x16020
61#define LTQ_ETOP_IGPLEN 0x16080
62
63#define MAX_DMA_CHAN 0x8
64#define MAX_DMA_CRC_LEN 0x4
65#define MAX_DMA_DATA_LEN 0x600
66
67#define ETOP_FTCU BIT(28)
68#define ETOP_MII_MASK 0xf
69#define ETOP_MII_NORMAL 0xd
70#define ETOP_MII_REVERSE 0xe
71#define ETOP_PLEN_UNDER 0x40
72#define ETOP_CGEN 0x800
73
74/* use 2 static channels for TX/RX */
75#define LTQ_ETOP_TX_CHANNEL 1
76#define LTQ_ETOP_RX_CHANNEL 6
77#define IS_TX(x) (x == LTQ_ETOP_TX_CHANNEL)
78#define IS_RX(x) (x == LTQ_ETOP_RX_CHANNEL)
79
80#define ltq_etop_r32(x) ltq_r32(ltq_etop_membase + (x))
81#define ltq_etop_w32(x, y) ltq_w32(x, ltq_etop_membase + (y))
82#define ltq_etop_w32_mask(x, y, z) \
83 ltq_w32_mask(x, y, ltq_etop_membase + (z))
84
85#define DRV_VERSION "1.0"
86
87static void __iomem *ltq_etop_membase;
88
89struct ltq_etop_chan {
90 int idx;
91 int tx_free;
92 struct net_device *netdev;
93 struct napi_struct napi;
94 struct ltq_dma_channel dma;
95 struct sk_buff *skb[LTQ_DESC_NUM];
96};
97
98struct ltq_etop_priv {
99 struct net_device *netdev;
100 struct platform_device *pdev;
101 struct ltq_eth_data *pldata;
102 struct resource *res;
103
104 struct mii_bus *mii_bus;
105
106 struct ltq_etop_chan ch[MAX_DMA_CHAN];
107 int tx_free[MAX_DMA_CHAN >> 1];
108
109 spinlock_t lock;
110};
111
112static int
113ltq_etop_alloc_skb(struct ltq_etop_chan *ch)
114{
115 ch->skb[ch->dma.desc] = netdev_alloc_skb(ch->netdev, MAX_DMA_DATA_LEN);
116 if (!ch->skb[ch->dma.desc])
117 return -ENOMEM;
118 ch->dma.desc_base[ch->dma.desc].addr = dma_map_single(NULL,
119 ch->skb[ch->dma.desc]->data, MAX_DMA_DATA_LEN,
120 DMA_FROM_DEVICE);
121 ch->dma.desc_base[ch->dma.desc].addr =
122 CPHYSADDR(ch->skb[ch->dma.desc]->data);
123 ch->dma.desc_base[ch->dma.desc].ctl =
124 LTQ_DMA_OWN | LTQ_DMA_RX_OFFSET(NET_IP_ALIGN) |
125 MAX_DMA_DATA_LEN;
126 skb_reserve(ch->skb[ch->dma.desc], NET_IP_ALIGN);
127 return 0;
128}
129
130static void
131ltq_etop_hw_receive(struct ltq_etop_chan *ch)
132{
133 struct ltq_etop_priv *priv = netdev_priv(ch->netdev);
134 struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
135 struct sk_buff *skb = ch->skb[ch->dma.desc];
136 int len = (desc->ctl & LTQ_DMA_SIZE_MASK) - MAX_DMA_CRC_LEN;
137 unsigned long flags;
138
139 spin_lock_irqsave(&priv->lock, flags);
140 if (ltq_etop_alloc_skb(ch)) {
141 netdev_err(ch->netdev,
142 "failed to allocate new rx buffer, stopping DMA\n");
143 ltq_dma_close(&ch->dma);
144 }
145 ch->dma.desc++;
146 ch->dma.desc %= LTQ_DESC_NUM;
147 spin_unlock_irqrestore(&priv->lock, flags);
148
149 skb_put(skb, len);
150 skb->protocol = eth_type_trans(skb, ch->netdev);
151 netif_receive_skb(skb);
152}
153
154static int
155ltq_etop_poll_rx(struct napi_struct *napi, int budget)
156{
157 struct ltq_etop_chan *ch = container_of(napi,
158 struct ltq_etop_chan, napi);
159 int work_done = 0;
160
161 while (work_done < budget) {
162 struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
163
164 if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) != LTQ_DMA_C)
165 break;
166 ltq_etop_hw_receive(ch);
167 work_done++;
168 }
169 if (work_done < budget) {
170 napi_complete_done(&ch->napi, work_done);
171 ltq_dma_ack_irq(&ch->dma);
172 }
173 return work_done;
174}
175
176static int
177ltq_etop_poll_tx(struct napi_struct *napi, int budget)
178{
179 struct ltq_etop_chan *ch =
180 container_of(napi, struct ltq_etop_chan, napi);
181 struct ltq_etop_priv *priv = netdev_priv(ch->netdev);
182 struct netdev_queue *txq =
183 netdev_get_tx_queue(ch->netdev, ch->idx >> 1);
184 unsigned long flags;
185
186 spin_lock_irqsave(&priv->lock, flags);
187 while ((ch->dma.desc_base[ch->tx_free].ctl &
188 (LTQ_DMA_OWN | LTQ_DMA_C)) == LTQ_DMA_C) {
189 dev_kfree_skb_any(ch->skb[ch->tx_free]);
190 ch->skb[ch->tx_free] = NULL;
191 memset(&ch->dma.desc_base[ch->tx_free], 0,
192 sizeof(struct ltq_dma_desc));
193 ch->tx_free++;
194 ch->tx_free %= LTQ_DESC_NUM;
195 }
196 spin_unlock_irqrestore(&priv->lock, flags);
197
198 if (netif_tx_queue_stopped(txq))
199 netif_tx_start_queue(txq);
200 napi_complete(&ch->napi);
201 ltq_dma_ack_irq(&ch->dma);
202 return 1;
203}
204
205static irqreturn_t
206ltq_etop_dma_irq(int irq, void *_priv)
207{
208 struct ltq_etop_priv *priv = _priv;
209 int ch = irq - LTQ_DMA_CH0_INT;
210
211 napi_schedule(&priv->ch[ch].napi);
212 return IRQ_HANDLED;
213}
214
215static void
216ltq_etop_free_channel(struct net_device *dev, struct ltq_etop_chan *ch)
217{
218 struct ltq_etop_priv *priv = netdev_priv(dev);
219
220 ltq_dma_free(&ch->dma);
221 if (ch->dma.irq)
222 free_irq(ch->dma.irq, priv);
223 if (IS_RX(ch->idx)) {
224 int desc;
225 for (desc = 0; desc < LTQ_DESC_NUM; desc++)
226 dev_kfree_skb_any(ch->skb[ch->dma.desc]);
227 }
228}
229
230static void
231ltq_etop_hw_exit(struct net_device *dev)
232{
233 struct ltq_etop_priv *priv = netdev_priv(dev);
234 int i;
235
236 ltq_pmu_disable(PMU_PPE);
237 for (i = 0; i < MAX_DMA_CHAN; i++)
238 if (IS_TX(i) || IS_RX(i))
239 ltq_etop_free_channel(dev, &priv->ch[i]);
240}
241
242static int
243ltq_etop_hw_init(struct net_device *dev)
244{
245 struct ltq_etop_priv *priv = netdev_priv(dev);
246 int i;
247
248 ltq_pmu_enable(PMU_PPE);
249
250 switch (priv->pldata->mii_mode) {
251 case PHY_INTERFACE_MODE_RMII:
252 ltq_etop_w32_mask(ETOP_MII_MASK,
253 ETOP_MII_REVERSE, LTQ_ETOP_CFG);
254 break;
255
256 case PHY_INTERFACE_MODE_MII:
257 ltq_etop_w32_mask(ETOP_MII_MASK,
258 ETOP_MII_NORMAL, LTQ_ETOP_CFG);
259 break;
260
261 default:
262 netdev_err(dev, "unknown mii mode %d\n",
263 priv->pldata->mii_mode);
264 return -ENOTSUPP;
265 }
266
267 /* enable crc generation */
268 ltq_etop_w32(PPE32_CGEN, LQ_PPE32_ENET_MAC_CFG);
269
270 ltq_dma_init_port(DMA_PORT_ETOP);
271
272 for (i = 0; i < MAX_DMA_CHAN; i++) {
273 int irq = LTQ_DMA_CH0_INT + i;
274 struct ltq_etop_chan *ch = &priv->ch[i];
275
276 ch->idx = ch->dma.nr = i;
277
278 if (IS_TX(i)) {
279 ltq_dma_alloc_tx(&ch->dma);
280 request_irq(irq, ltq_etop_dma_irq, 0, "etop_tx", priv);
281 } else if (IS_RX(i)) {
282 ltq_dma_alloc_rx(&ch->dma);
283 for (ch->dma.desc = 0; ch->dma.desc < LTQ_DESC_NUM;
284 ch->dma.desc++)
285 if (ltq_etop_alloc_skb(ch))
286 return -ENOMEM;
287 ch->dma.desc = 0;
288 request_irq(irq, ltq_etop_dma_irq, 0, "etop_rx", priv);
289 }
290 ch->dma.irq = irq;
291 }
292 return 0;
293}
294
295static void
296ltq_etop_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
297{
298 strlcpy(info->driver, "Lantiq ETOP", sizeof(info->driver));
299 strlcpy(info->bus_info, "internal", sizeof(info->bus_info));
300 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
301}
302
303static const struct ethtool_ops ltq_etop_ethtool_ops = {
304 .get_drvinfo = ltq_etop_get_drvinfo,
305 .nway_reset = phy_ethtool_nway_reset,
306 .get_link_ksettings = phy_ethtool_get_link_ksettings,
307 .set_link_ksettings = phy_ethtool_set_link_ksettings,
308};
309
310static int
311ltq_etop_mdio_wr(struct mii_bus *bus, int phy_addr, int phy_reg, u16 phy_data)
312{
313 u32 val = MDIO_REQUEST |
314 ((phy_addr & MDIO_ADDR_MASK) << MDIO_ADDR_OFFSET) |
315 ((phy_reg & MDIO_REG_MASK) << MDIO_REG_OFFSET) |
316 phy_data;
317
318 while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
319 ;
320 ltq_etop_w32(val, LTQ_ETOP_MDIO);
321 return 0;
322}
323
324static int
325ltq_etop_mdio_rd(struct mii_bus *bus, int phy_addr, int phy_reg)
326{
327 u32 val = MDIO_REQUEST | MDIO_READ |
328 ((phy_addr & MDIO_ADDR_MASK) << MDIO_ADDR_OFFSET) |
329 ((phy_reg & MDIO_REG_MASK) << MDIO_REG_OFFSET);
330
331 while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
332 ;
333 ltq_etop_w32(val, LTQ_ETOP_MDIO);
334 while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
335 ;
336 val = ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_VAL_MASK;
337 return val;
338}
339
340static void
341ltq_etop_mdio_link(struct net_device *dev)
342{
343 /* nothing to do */
344}
345
346static int
347ltq_etop_mdio_probe(struct net_device *dev)
348{
349 struct ltq_etop_priv *priv = netdev_priv(dev);
350 struct phy_device *phydev;
351
352 phydev = phy_find_first(priv->mii_bus);
353
354 if (!phydev) {
355 netdev_err(dev, "no PHY found\n");
356 return -ENODEV;
357 }
358
359 phydev = phy_connect(dev, phydev_name(phydev),
360 <q_etop_mdio_link, priv->pldata->mii_mode);
361
362 if (IS_ERR(phydev)) {
363 netdev_err(dev, "Could not attach to PHY\n");
364 return PTR_ERR(phydev);
365 }
366
367 phydev->supported &= (SUPPORTED_10baseT_Half
368 | SUPPORTED_10baseT_Full
369 | SUPPORTED_100baseT_Half
370 | SUPPORTED_100baseT_Full
371 | SUPPORTED_Autoneg
372 | SUPPORTED_MII
373 | SUPPORTED_TP);
374
375 phydev->advertising = phydev->supported;
376 phy_attached_info(phydev);
377
378 return 0;
379}
380
381static int
382ltq_etop_mdio_init(struct net_device *dev)
383{
384 struct ltq_etop_priv *priv = netdev_priv(dev);
385 int err;
386
387 priv->mii_bus = mdiobus_alloc();
388 if (!priv->mii_bus) {
389 netdev_err(dev, "failed to allocate mii bus\n");
390 err = -ENOMEM;
391 goto err_out;
392 }
393
394 priv->mii_bus->priv = dev;
395 priv->mii_bus->read = ltq_etop_mdio_rd;
396 priv->mii_bus->write = ltq_etop_mdio_wr;
397 priv->mii_bus->name = "ltq_mii";
398 snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
399 priv->pdev->name, priv->pdev->id);
400 if (mdiobus_register(priv->mii_bus)) {
401 err = -ENXIO;
402 goto err_out_free_mdiobus;
403 }
404
405 if (ltq_etop_mdio_probe(dev)) {
406 err = -ENXIO;
407 goto err_out_unregister_bus;
408 }
409 return 0;
410
411err_out_unregister_bus:
412 mdiobus_unregister(priv->mii_bus);
413err_out_free_mdiobus:
414 mdiobus_free(priv->mii_bus);
415err_out:
416 return err;
417}
418
419static void
420ltq_etop_mdio_cleanup(struct net_device *dev)
421{
422 struct ltq_etop_priv *priv = netdev_priv(dev);
423
424 phy_disconnect(dev->phydev);
425 mdiobus_unregister(priv->mii_bus);
426 mdiobus_free(priv->mii_bus);
427}
428
429static int
430ltq_etop_open(struct net_device *dev)
431{
432 struct ltq_etop_priv *priv = netdev_priv(dev);
433 int i;
434
435 for (i = 0; i < MAX_DMA_CHAN; i++) {
436 struct ltq_etop_chan *ch = &priv->ch[i];
437
438 if (!IS_TX(i) && (!IS_RX(i)))
439 continue;
440 ltq_dma_open(&ch->dma);
441 napi_enable(&ch->napi);
442 }
443 phy_start(dev->phydev);
444 netif_tx_start_all_queues(dev);
445 return 0;
446}
447
448static int
449ltq_etop_stop(struct net_device *dev)
450{
451 struct ltq_etop_priv *priv = netdev_priv(dev);
452 int i;
453
454 netif_tx_stop_all_queues(dev);
455 phy_stop(dev->phydev);
456 for (i = 0; i < MAX_DMA_CHAN; i++) {
457 struct ltq_etop_chan *ch = &priv->ch[i];
458
459 if (!IS_RX(i) && !IS_TX(i))
460 continue;
461 napi_disable(&ch->napi);
462 ltq_dma_close(&ch->dma);
463 }
464 return 0;
465}
466
467static int
468ltq_etop_tx(struct sk_buff *skb, struct net_device *dev)
469{
470 int queue = skb_get_queue_mapping(skb);
471 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue);
472 struct ltq_etop_priv *priv = netdev_priv(dev);
473 struct ltq_etop_chan *ch = &priv->ch[(queue << 1) | 1];
474 struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
475 int len;
476 unsigned long flags;
477 u32 byte_offset;
478
479 len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
480
481 if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) || ch->skb[ch->dma.desc]) {
482 dev_kfree_skb_any(skb);
483 netdev_err(dev, "tx ring full\n");
484 netif_tx_stop_queue(txq);
485 return NETDEV_TX_BUSY;
486 }
487
488 /* dma needs to start on a 16 byte aligned address */
489 byte_offset = CPHYSADDR(skb->data) % 16;
490 ch->skb[ch->dma.desc] = skb;
491
492 netif_trans_update(dev);
493
494 spin_lock_irqsave(&priv->lock, flags);
495 desc->addr = ((unsigned int) dma_map_single(NULL, skb->data, len,
496 DMA_TO_DEVICE)) - byte_offset;
497 wmb();
498 desc->ctl = LTQ_DMA_OWN | LTQ_DMA_SOP | LTQ_DMA_EOP |
499 LTQ_DMA_TX_OFFSET(byte_offset) | (len & LTQ_DMA_SIZE_MASK);
500 ch->dma.desc++;
501 ch->dma.desc %= LTQ_DESC_NUM;
502 spin_unlock_irqrestore(&priv->lock, flags);
503
504 if (ch->dma.desc_base[ch->dma.desc].ctl & LTQ_DMA_OWN)
505 netif_tx_stop_queue(txq);
506
507 return NETDEV_TX_OK;
508}
509
510static int
511ltq_etop_change_mtu(struct net_device *dev, int new_mtu)
512{
513 struct ltq_etop_priv *priv = netdev_priv(dev);
514 unsigned long flags;
515
516 dev->mtu = new_mtu;
517
518 spin_lock_irqsave(&priv->lock, flags);
519 ltq_etop_w32((ETOP_PLEN_UNDER << 16) | new_mtu, LTQ_ETOP_IGPLEN);
520 spin_unlock_irqrestore(&priv->lock, flags);
521
522 return 0;
523}
524
525static int
526ltq_etop_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
527{
528 /* TODO: mii-toll reports "No MII transceiver present!." ?!*/
529 return phy_mii_ioctl(dev->phydev, rq, cmd);
530}
531
532static int
533ltq_etop_set_mac_address(struct net_device *dev, void *p)
534{
535 int ret = eth_mac_addr(dev, p);
536
537 if (!ret) {
538 struct ltq_etop_priv *priv = netdev_priv(dev);
539 unsigned long flags;
540
541 /* store the mac for the unicast filter */
542 spin_lock_irqsave(&priv->lock, flags);
543 ltq_etop_w32(*((u32 *)dev->dev_addr), LTQ_ETOP_MAC_DA0);
544 ltq_etop_w32(*((u16 *)&dev->dev_addr[4]) << 16,
545 LTQ_ETOP_MAC_DA1);
546 spin_unlock_irqrestore(&priv->lock, flags);
547 }
548 return ret;
549}
550
551static void
552ltq_etop_set_multicast_list(struct net_device *dev)
553{
554 struct ltq_etop_priv *priv = netdev_priv(dev);
555 unsigned long flags;
556
557 /* ensure that the unicast filter is not enabled in promiscious mode */
558 spin_lock_irqsave(&priv->lock, flags);
559 if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI))
560 ltq_etop_w32_mask(ETOP_FTCU, 0, LTQ_ETOP_ENETS0);
561 else
562 ltq_etop_w32_mask(0, ETOP_FTCU, LTQ_ETOP_ENETS0);
563 spin_unlock_irqrestore(&priv->lock, flags);
564}
565
566static u16
567ltq_etop_select_queue(struct net_device *dev, struct sk_buff *skb,
568 void *accel_priv, select_queue_fallback_t fallback)
569{
570 /* we are currently only using the first queue */
571 return 0;
572}
573
574static int
575ltq_etop_init(struct net_device *dev)
576{
577 struct ltq_etop_priv *priv = netdev_priv(dev);
578 struct sockaddr mac;
579 int err;
580 bool random_mac = false;
581
582 dev->watchdog_timeo = 10 * HZ;
583 err = ltq_etop_hw_init(dev);
584 if (err)
585 goto err_hw;
586 ltq_etop_change_mtu(dev, 1500);
587
588 memcpy(&mac, &priv->pldata->mac, sizeof(struct sockaddr));
589 if (!is_valid_ether_addr(mac.sa_data)) {
590 pr_warn("etop: invalid MAC, using random\n");
591 eth_random_addr(mac.sa_data);
592 random_mac = true;
593 }
594
595 err = ltq_etop_set_mac_address(dev, &mac);
596 if (err)
597 goto err_netdev;
598
599 /* Set addr_assign_type here, ltq_etop_set_mac_address would reset it. */
600 if (random_mac)
601 dev->addr_assign_type = NET_ADDR_RANDOM;
602
603 ltq_etop_set_multicast_list(dev);
604 err = ltq_etop_mdio_init(dev);
605 if (err)
606 goto err_netdev;
607 return 0;
608
609err_netdev:
610 unregister_netdev(dev);
611 free_netdev(dev);
612err_hw:
613 ltq_etop_hw_exit(dev);
614 return err;
615}
616
617static void
618ltq_etop_tx_timeout(struct net_device *dev)
619{
620 int err;
621
622 ltq_etop_hw_exit(dev);
623 err = ltq_etop_hw_init(dev);
624 if (err)
625 goto err_hw;
626 netif_trans_update(dev);
627 netif_wake_queue(dev);
628 return;
629
630err_hw:
631 ltq_etop_hw_exit(dev);
632 netdev_err(dev, "failed to restart etop after TX timeout\n");
633}
634
635static const struct net_device_ops ltq_eth_netdev_ops = {
636 .ndo_open = ltq_etop_open,
637 .ndo_stop = ltq_etop_stop,
638 .ndo_start_xmit = ltq_etop_tx,
639 .ndo_change_mtu = ltq_etop_change_mtu,
640 .ndo_do_ioctl = ltq_etop_ioctl,
641 .ndo_set_mac_address = ltq_etop_set_mac_address,
642 .ndo_validate_addr = eth_validate_addr,
643 .ndo_set_rx_mode = ltq_etop_set_multicast_list,
644 .ndo_select_queue = ltq_etop_select_queue,
645 .ndo_init = ltq_etop_init,
646 .ndo_tx_timeout = ltq_etop_tx_timeout,
647};
648
649static int __init
650ltq_etop_probe(struct platform_device *pdev)
651{
652 struct net_device *dev;
653 struct ltq_etop_priv *priv;
654 struct resource *res;
655 int err;
656 int i;
657
658 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
659 if (!res) {
660 dev_err(&pdev->dev, "failed to get etop resource\n");
661 err = -ENOENT;
662 goto err_out;
663 }
664
665 res = devm_request_mem_region(&pdev->dev, res->start,
666 resource_size(res), dev_name(&pdev->dev));
667 if (!res) {
668 dev_err(&pdev->dev, "failed to request etop resource\n");
669 err = -EBUSY;
670 goto err_out;
671 }
672
673 ltq_etop_membase = devm_ioremap_nocache(&pdev->dev,
674 res->start, resource_size(res));
675 if (!ltq_etop_membase) {
676 dev_err(&pdev->dev, "failed to remap etop engine %d\n",
677 pdev->id);
678 err = -ENOMEM;
679 goto err_out;
680 }
681
682 dev = alloc_etherdev_mq(sizeof(struct ltq_etop_priv), 4);
683 if (!dev) {
684 err = -ENOMEM;
685 goto err_out;
686 }
687 strcpy(dev->name, "eth%d");
688 dev->netdev_ops = <q_eth_netdev_ops;
689 dev->ethtool_ops = <q_etop_ethtool_ops;
690 priv = netdev_priv(dev);
691 priv->res = res;
692 priv->pdev = pdev;
693 priv->pldata = dev_get_platdata(&pdev->dev);
694 priv->netdev = dev;
695 spin_lock_init(&priv->lock);
696 SET_NETDEV_DEV(dev, &pdev->dev);
697
698 for (i = 0; i < MAX_DMA_CHAN; i++) {
699 if (IS_TX(i))
700 netif_napi_add(dev, &priv->ch[i].napi,
701 ltq_etop_poll_tx, 8);
702 else if (IS_RX(i))
703 netif_napi_add(dev, &priv->ch[i].napi,
704 ltq_etop_poll_rx, 32);
705 priv->ch[i].netdev = dev;
706 }
707
708 err = register_netdev(dev);
709 if (err)
710 goto err_free;
711
712 platform_set_drvdata(pdev, dev);
713 return 0;
714
715err_free:
716 free_netdev(dev);
717err_out:
718 return err;
719}
720
721static int
722ltq_etop_remove(struct platform_device *pdev)
723{
724 struct net_device *dev = platform_get_drvdata(pdev);
725
726 if (dev) {
727 netif_tx_stop_all_queues(dev);
728 ltq_etop_hw_exit(dev);
729 ltq_etop_mdio_cleanup(dev);
730 unregister_netdev(dev);
731 }
732 return 0;
733}
734
735static struct platform_driver ltq_mii_driver = {
736 .remove = ltq_etop_remove,
737 .driver = {
738 .name = "ltq_etop",
739 },
740};
741
742int __init
743init_ltq_etop(void)
744{
745 int ret = platform_driver_probe(<q_mii_driver, ltq_etop_probe);
746
747 if (ret)
748 pr_err("ltq_etop: Error registering platform driver!");
749 return ret;
750}
751
752static void __exit
753exit_ltq_etop(void)
754{
755 platform_driver_unregister(<q_mii_driver);
756}
757
758module_init(init_ltq_etop);
759module_exit(exit_ltq_etop);
760
761MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
762MODULE_DESCRIPTION("Lantiq SoC ETOP");
763MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *
4 * Copyright (C) 2011 John Crispin <blogic@openwrt.org>
5 */
6
7#include <linux/kernel.h>
8#include <linux/slab.h>
9#include <linux/errno.h>
10#include <linux/types.h>
11#include <linux/interrupt.h>
12#include <linux/uaccess.h>
13#include <linux/in.h>
14#include <linux/netdevice.h>
15#include <linux/etherdevice.h>
16#include <linux/phy.h>
17#include <linux/ip.h>
18#include <linux/tcp.h>
19#include <linux/skbuff.h>
20#include <linux/mm.h>
21#include <linux/platform_device.h>
22#include <linux/ethtool.h>
23#include <linux/init.h>
24#include <linux/delay.h>
25#include <linux/io.h>
26#include <linux/dma-mapping.h>
27#include <linux/module.h>
28#include <linux/property.h>
29
30#include <asm/checksum.h>
31
32#include <lantiq_soc.h>
33#include <xway_dma.h>
34#include <lantiq_platform.h>
35
36#define LTQ_ETOP_MDIO 0x11804
37#define MDIO_REQUEST 0x80000000
38#define MDIO_READ 0x40000000
39#define MDIO_ADDR_MASK 0x1f
40#define MDIO_ADDR_OFFSET 0x15
41#define MDIO_REG_MASK 0x1f
42#define MDIO_REG_OFFSET 0x10
43#define MDIO_VAL_MASK 0xffff
44
45#define PPE32_CGEN 0x800
46#define LQ_PPE32_ENET_MAC_CFG 0x1840
47
48#define LTQ_ETOP_ENETS0 0x11850
49#define LTQ_ETOP_MAC_DA0 0x1186C
50#define LTQ_ETOP_MAC_DA1 0x11870
51#define LTQ_ETOP_CFG 0x16020
52#define LTQ_ETOP_IGPLEN 0x16080
53
54#define MAX_DMA_CHAN 0x8
55#define MAX_DMA_CRC_LEN 0x4
56#define MAX_DMA_DATA_LEN 0x600
57
58#define ETOP_FTCU BIT(28)
59#define ETOP_MII_MASK 0xf
60#define ETOP_MII_NORMAL 0xd
61#define ETOP_MII_REVERSE 0xe
62#define ETOP_PLEN_UNDER 0x40
63#define ETOP_CGEN 0x800
64
65/* use 2 static channels for TX/RX */
66#define LTQ_ETOP_TX_CHANNEL 1
67#define LTQ_ETOP_RX_CHANNEL 6
68#define IS_TX(x) ((x) == LTQ_ETOP_TX_CHANNEL)
69#define IS_RX(x) ((x) == LTQ_ETOP_RX_CHANNEL)
70
71#define ltq_etop_r32(x) ltq_r32(ltq_etop_membase + (x))
72#define ltq_etop_w32(x, y) ltq_w32(x, ltq_etop_membase + (y))
73#define ltq_etop_w32_mask(x, y, z) \
74 ltq_w32_mask(x, y, ltq_etop_membase + (z))
75
76#define DRV_VERSION "1.0"
77
78static void __iomem *ltq_etop_membase;
79
80struct ltq_etop_chan {
81 int idx;
82 int tx_free;
83 struct net_device *netdev;
84 struct napi_struct napi;
85 struct ltq_dma_channel dma;
86 struct sk_buff *skb[LTQ_DESC_NUM];
87};
88
89struct ltq_etop_priv {
90 struct net_device *netdev;
91 struct platform_device *pdev;
92 struct ltq_eth_data *pldata;
93 struct resource *res;
94
95 struct mii_bus *mii_bus;
96
97 struct ltq_etop_chan ch[MAX_DMA_CHAN];
98 int tx_free[MAX_DMA_CHAN >> 1];
99
100 int tx_burst_len;
101 int rx_burst_len;
102
103 spinlock_t lock;
104};
105
106static int
107ltq_etop_alloc_skb(struct ltq_etop_chan *ch)
108{
109 struct ltq_etop_priv *priv = netdev_priv(ch->netdev);
110
111 ch->skb[ch->dma.desc] = netdev_alloc_skb(ch->netdev, MAX_DMA_DATA_LEN);
112 if (!ch->skb[ch->dma.desc])
113 return -ENOMEM;
114 ch->dma.desc_base[ch->dma.desc].addr =
115 dma_map_single(&priv->pdev->dev, ch->skb[ch->dma.desc]->data,
116 MAX_DMA_DATA_LEN, DMA_FROM_DEVICE);
117 ch->dma.desc_base[ch->dma.desc].addr =
118 CPHYSADDR(ch->skb[ch->dma.desc]->data);
119 ch->dma.desc_base[ch->dma.desc].ctl =
120 LTQ_DMA_OWN | LTQ_DMA_RX_OFFSET(NET_IP_ALIGN) |
121 MAX_DMA_DATA_LEN;
122 skb_reserve(ch->skb[ch->dma.desc], NET_IP_ALIGN);
123 return 0;
124}
125
126static void
127ltq_etop_hw_receive(struct ltq_etop_chan *ch)
128{
129 struct ltq_etop_priv *priv = netdev_priv(ch->netdev);
130 struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
131 struct sk_buff *skb = ch->skb[ch->dma.desc];
132 int len = (desc->ctl & LTQ_DMA_SIZE_MASK) - MAX_DMA_CRC_LEN;
133 unsigned long flags;
134
135 spin_lock_irqsave(&priv->lock, flags);
136 if (ltq_etop_alloc_skb(ch)) {
137 netdev_err(ch->netdev,
138 "failed to allocate new rx buffer, stopping DMA\n");
139 ltq_dma_close(&ch->dma);
140 }
141 ch->dma.desc++;
142 ch->dma.desc %= LTQ_DESC_NUM;
143 spin_unlock_irqrestore(&priv->lock, flags);
144
145 skb_put(skb, len);
146 skb->protocol = eth_type_trans(skb, ch->netdev);
147 netif_receive_skb(skb);
148}
149
150static int
151ltq_etop_poll_rx(struct napi_struct *napi, int budget)
152{
153 struct ltq_etop_chan *ch = container_of(napi,
154 struct ltq_etop_chan, napi);
155 int work_done = 0;
156
157 while (work_done < budget) {
158 struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
159
160 if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) != LTQ_DMA_C)
161 break;
162 ltq_etop_hw_receive(ch);
163 work_done++;
164 }
165 if (work_done < budget) {
166 napi_complete_done(&ch->napi, work_done);
167 ltq_dma_ack_irq(&ch->dma);
168 }
169 return work_done;
170}
171
172static int
173ltq_etop_poll_tx(struct napi_struct *napi, int budget)
174{
175 struct ltq_etop_chan *ch =
176 container_of(napi, struct ltq_etop_chan, napi);
177 struct ltq_etop_priv *priv = netdev_priv(ch->netdev);
178 struct netdev_queue *txq =
179 netdev_get_tx_queue(ch->netdev, ch->idx >> 1);
180 unsigned long flags;
181
182 spin_lock_irqsave(&priv->lock, flags);
183 while ((ch->dma.desc_base[ch->tx_free].ctl &
184 (LTQ_DMA_OWN | LTQ_DMA_C)) == LTQ_DMA_C) {
185 dev_kfree_skb_any(ch->skb[ch->tx_free]);
186 ch->skb[ch->tx_free] = NULL;
187 memset(&ch->dma.desc_base[ch->tx_free], 0,
188 sizeof(struct ltq_dma_desc));
189 ch->tx_free++;
190 ch->tx_free %= LTQ_DESC_NUM;
191 }
192 spin_unlock_irqrestore(&priv->lock, flags);
193
194 if (netif_tx_queue_stopped(txq))
195 netif_tx_start_queue(txq);
196 napi_complete(&ch->napi);
197 ltq_dma_ack_irq(&ch->dma);
198 return 1;
199}
200
201static irqreturn_t
202ltq_etop_dma_irq(int irq, void *_priv)
203{
204 struct ltq_etop_priv *priv = _priv;
205 int ch = irq - LTQ_DMA_CH0_INT;
206
207 napi_schedule(&priv->ch[ch].napi);
208 return IRQ_HANDLED;
209}
210
211static void
212ltq_etop_free_channel(struct net_device *dev, struct ltq_etop_chan *ch)
213{
214 struct ltq_etop_priv *priv = netdev_priv(dev);
215
216 ltq_dma_free(&ch->dma);
217 if (ch->dma.irq)
218 free_irq(ch->dma.irq, priv);
219 if (IS_RX(ch->idx)) {
220 int desc;
221
222 for (desc = 0; desc < LTQ_DESC_NUM; desc++)
223 dev_kfree_skb_any(ch->skb[ch->dma.desc]);
224 }
225}
226
227static void
228ltq_etop_hw_exit(struct net_device *dev)
229{
230 struct ltq_etop_priv *priv = netdev_priv(dev);
231 int i;
232
233 ltq_pmu_disable(PMU_PPE);
234 for (i = 0; i < MAX_DMA_CHAN; i++)
235 if (IS_TX(i) || IS_RX(i))
236 ltq_etop_free_channel(dev, &priv->ch[i]);
237}
238
239static int
240ltq_etop_hw_init(struct net_device *dev)
241{
242 struct ltq_etop_priv *priv = netdev_priv(dev);
243 int i;
244 int err;
245
246 ltq_pmu_enable(PMU_PPE);
247
248 switch (priv->pldata->mii_mode) {
249 case PHY_INTERFACE_MODE_RMII:
250 ltq_etop_w32_mask(ETOP_MII_MASK, ETOP_MII_REVERSE,
251 LTQ_ETOP_CFG);
252 break;
253
254 case PHY_INTERFACE_MODE_MII:
255 ltq_etop_w32_mask(ETOP_MII_MASK, ETOP_MII_NORMAL,
256 LTQ_ETOP_CFG);
257 break;
258
259 default:
260 netdev_err(dev, "unknown mii mode %d\n",
261 priv->pldata->mii_mode);
262 return -ENOTSUPP;
263 }
264
265 /* enable crc generation */
266 ltq_etop_w32(PPE32_CGEN, LQ_PPE32_ENET_MAC_CFG);
267
268 ltq_dma_init_port(DMA_PORT_ETOP, priv->tx_burst_len, priv->rx_burst_len);
269
270 for (i = 0; i < MAX_DMA_CHAN; i++) {
271 int irq = LTQ_DMA_CH0_INT + i;
272 struct ltq_etop_chan *ch = &priv->ch[i];
273
274 ch->dma.nr = i;
275 ch->idx = ch->dma.nr;
276 ch->dma.dev = &priv->pdev->dev;
277
278 if (IS_TX(i)) {
279 ltq_dma_alloc_tx(&ch->dma);
280 err = request_irq(irq, ltq_etop_dma_irq, 0, "etop_tx", priv);
281 if (err) {
282 netdev_err(dev,
283 "Unable to get Tx DMA IRQ %d\n",
284 irq);
285 return err;
286 }
287 } else if (IS_RX(i)) {
288 ltq_dma_alloc_rx(&ch->dma);
289 for (ch->dma.desc = 0; ch->dma.desc < LTQ_DESC_NUM;
290 ch->dma.desc++)
291 if (ltq_etop_alloc_skb(ch))
292 return -ENOMEM;
293 ch->dma.desc = 0;
294 err = request_irq(irq, ltq_etop_dma_irq, 0, "etop_rx", priv);
295 if (err) {
296 netdev_err(dev,
297 "Unable to get Rx DMA IRQ %d\n",
298 irq);
299 return err;
300 }
301 }
302 ch->dma.irq = irq;
303 }
304 return 0;
305}
306
307static void
308ltq_etop_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
309{
310 strscpy(info->driver, "Lantiq ETOP", sizeof(info->driver));
311 strscpy(info->bus_info, "internal", sizeof(info->bus_info));
312 strscpy(info->version, DRV_VERSION, sizeof(info->version));
313}
314
315static const struct ethtool_ops ltq_etop_ethtool_ops = {
316 .get_drvinfo = ltq_etop_get_drvinfo,
317 .nway_reset = phy_ethtool_nway_reset,
318 .get_link_ksettings = phy_ethtool_get_link_ksettings,
319 .set_link_ksettings = phy_ethtool_set_link_ksettings,
320};
321
322static int
323ltq_etop_mdio_wr(struct mii_bus *bus, int phy_addr, int phy_reg, u16 phy_data)
324{
325 u32 val = MDIO_REQUEST |
326 ((phy_addr & MDIO_ADDR_MASK) << MDIO_ADDR_OFFSET) |
327 ((phy_reg & MDIO_REG_MASK) << MDIO_REG_OFFSET) |
328 phy_data;
329
330 while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
331 ;
332 ltq_etop_w32(val, LTQ_ETOP_MDIO);
333 return 0;
334}
335
336static int
337ltq_etop_mdio_rd(struct mii_bus *bus, int phy_addr, int phy_reg)
338{
339 u32 val = MDIO_REQUEST | MDIO_READ |
340 ((phy_addr & MDIO_ADDR_MASK) << MDIO_ADDR_OFFSET) |
341 ((phy_reg & MDIO_REG_MASK) << MDIO_REG_OFFSET);
342
343 while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
344 ;
345 ltq_etop_w32(val, LTQ_ETOP_MDIO);
346 while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
347 ;
348 val = ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_VAL_MASK;
349 return val;
350}
351
352static void
353ltq_etop_mdio_link(struct net_device *dev)
354{
355 /* nothing to do */
356}
357
358static int
359ltq_etop_mdio_probe(struct net_device *dev)
360{
361 struct ltq_etop_priv *priv = netdev_priv(dev);
362 struct phy_device *phydev;
363
364 phydev = phy_find_first(priv->mii_bus);
365
366 if (!phydev) {
367 netdev_err(dev, "no PHY found\n");
368 return -ENODEV;
369 }
370
371 phydev = phy_connect(dev, phydev_name(phydev),
372 <q_etop_mdio_link, priv->pldata->mii_mode);
373
374 if (IS_ERR(phydev)) {
375 netdev_err(dev, "Could not attach to PHY\n");
376 return PTR_ERR(phydev);
377 }
378
379 phy_set_max_speed(phydev, SPEED_100);
380
381 phy_attached_info(phydev);
382
383 return 0;
384}
385
386static int
387ltq_etop_mdio_init(struct net_device *dev)
388{
389 struct ltq_etop_priv *priv = netdev_priv(dev);
390 int err;
391
392 priv->mii_bus = mdiobus_alloc();
393 if (!priv->mii_bus) {
394 netdev_err(dev, "failed to allocate mii bus\n");
395 err = -ENOMEM;
396 goto err_out;
397 }
398
399 priv->mii_bus->priv = dev;
400 priv->mii_bus->read = ltq_etop_mdio_rd;
401 priv->mii_bus->write = ltq_etop_mdio_wr;
402 priv->mii_bus->name = "ltq_mii";
403 snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
404 priv->pdev->name, priv->pdev->id);
405 if (mdiobus_register(priv->mii_bus)) {
406 err = -ENXIO;
407 goto err_out_free_mdiobus;
408 }
409
410 if (ltq_etop_mdio_probe(dev)) {
411 err = -ENXIO;
412 goto err_out_unregister_bus;
413 }
414 return 0;
415
416err_out_unregister_bus:
417 mdiobus_unregister(priv->mii_bus);
418err_out_free_mdiobus:
419 mdiobus_free(priv->mii_bus);
420err_out:
421 return err;
422}
423
424static void
425ltq_etop_mdio_cleanup(struct net_device *dev)
426{
427 struct ltq_etop_priv *priv = netdev_priv(dev);
428
429 phy_disconnect(dev->phydev);
430 mdiobus_unregister(priv->mii_bus);
431 mdiobus_free(priv->mii_bus);
432}
433
434static int
435ltq_etop_open(struct net_device *dev)
436{
437 struct ltq_etop_priv *priv = netdev_priv(dev);
438 int i;
439
440 for (i = 0; i < MAX_DMA_CHAN; i++) {
441 struct ltq_etop_chan *ch = &priv->ch[i];
442
443 if (!IS_TX(i) && (!IS_RX(i)))
444 continue;
445 ltq_dma_open(&ch->dma);
446 ltq_dma_enable_irq(&ch->dma);
447 napi_enable(&ch->napi);
448 }
449 phy_start(dev->phydev);
450 netif_tx_start_all_queues(dev);
451 return 0;
452}
453
454static int
455ltq_etop_stop(struct net_device *dev)
456{
457 struct ltq_etop_priv *priv = netdev_priv(dev);
458 int i;
459
460 netif_tx_stop_all_queues(dev);
461 phy_stop(dev->phydev);
462 for (i = 0; i < MAX_DMA_CHAN; i++) {
463 struct ltq_etop_chan *ch = &priv->ch[i];
464
465 if (!IS_RX(i) && !IS_TX(i))
466 continue;
467 napi_disable(&ch->napi);
468 ltq_dma_close(&ch->dma);
469 }
470 return 0;
471}
472
473static netdev_tx_t
474ltq_etop_tx(struct sk_buff *skb, struct net_device *dev)
475{
476 int queue = skb_get_queue_mapping(skb);
477 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue);
478 struct ltq_etop_priv *priv = netdev_priv(dev);
479 struct ltq_etop_chan *ch = &priv->ch[(queue << 1) | 1];
480 struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
481 int len;
482 unsigned long flags;
483 u32 byte_offset;
484
485 len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
486
487 if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) || ch->skb[ch->dma.desc]) {
488 netdev_err(dev, "tx ring full\n");
489 netif_tx_stop_queue(txq);
490 return NETDEV_TX_BUSY;
491 }
492
493 /* dma needs to start on a burst length value aligned address */
494 byte_offset = CPHYSADDR(skb->data) % (priv->tx_burst_len * 4);
495 ch->skb[ch->dma.desc] = skb;
496
497 netif_trans_update(dev);
498
499 spin_lock_irqsave(&priv->lock, flags);
500 desc->addr = ((unsigned int)dma_map_single(&priv->pdev->dev, skb->data, len,
501 DMA_TO_DEVICE)) - byte_offset;
502 /* Make sure the address is written before we give it to HW */
503 wmb();
504 desc->ctl = LTQ_DMA_OWN | LTQ_DMA_SOP | LTQ_DMA_EOP |
505 LTQ_DMA_TX_OFFSET(byte_offset) | (len & LTQ_DMA_SIZE_MASK);
506 ch->dma.desc++;
507 ch->dma.desc %= LTQ_DESC_NUM;
508 spin_unlock_irqrestore(&priv->lock, flags);
509
510 if (ch->dma.desc_base[ch->dma.desc].ctl & LTQ_DMA_OWN)
511 netif_tx_stop_queue(txq);
512
513 return NETDEV_TX_OK;
514}
515
516static int
517ltq_etop_change_mtu(struct net_device *dev, int new_mtu)
518{
519 struct ltq_etop_priv *priv = netdev_priv(dev);
520 unsigned long flags;
521
522 dev->mtu = new_mtu;
523
524 spin_lock_irqsave(&priv->lock, flags);
525 ltq_etop_w32((ETOP_PLEN_UNDER << 16) | new_mtu, LTQ_ETOP_IGPLEN);
526 spin_unlock_irqrestore(&priv->lock, flags);
527
528 return 0;
529}
530
531static int
532ltq_etop_set_mac_address(struct net_device *dev, void *p)
533{
534 int ret = eth_mac_addr(dev, p);
535
536 if (!ret) {
537 struct ltq_etop_priv *priv = netdev_priv(dev);
538 unsigned long flags;
539
540 /* store the mac for the unicast filter */
541 spin_lock_irqsave(&priv->lock, flags);
542 ltq_etop_w32(*((u32 *)dev->dev_addr), LTQ_ETOP_MAC_DA0);
543 ltq_etop_w32(*((u16 *)&dev->dev_addr[4]) << 16,
544 LTQ_ETOP_MAC_DA1);
545 spin_unlock_irqrestore(&priv->lock, flags);
546 }
547 return ret;
548}
549
550static void
551ltq_etop_set_multicast_list(struct net_device *dev)
552{
553 struct ltq_etop_priv *priv = netdev_priv(dev);
554 unsigned long flags;
555
556 /* ensure that the unicast filter is not enabled in promiscious mode */
557 spin_lock_irqsave(&priv->lock, flags);
558 if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI))
559 ltq_etop_w32_mask(ETOP_FTCU, 0, LTQ_ETOP_ENETS0);
560 else
561 ltq_etop_w32_mask(0, ETOP_FTCU, LTQ_ETOP_ENETS0);
562 spin_unlock_irqrestore(&priv->lock, flags);
563}
564
565static int
566ltq_etop_init(struct net_device *dev)
567{
568 struct ltq_etop_priv *priv = netdev_priv(dev);
569 struct sockaddr mac;
570 int err;
571 bool random_mac = false;
572
573 dev->watchdog_timeo = 10 * HZ;
574 err = ltq_etop_hw_init(dev);
575 if (err)
576 goto err_hw;
577 ltq_etop_change_mtu(dev, 1500);
578
579 memcpy(&mac, &priv->pldata->mac, sizeof(struct sockaddr));
580 if (!is_valid_ether_addr(mac.sa_data)) {
581 pr_warn("etop: invalid MAC, using random\n");
582 eth_random_addr(mac.sa_data);
583 random_mac = true;
584 }
585
586 err = ltq_etop_set_mac_address(dev, &mac);
587 if (err)
588 goto err_netdev;
589
590 /* Set addr_assign_type here, ltq_etop_set_mac_address would reset it. */
591 if (random_mac)
592 dev->addr_assign_type = NET_ADDR_RANDOM;
593
594 ltq_etop_set_multicast_list(dev);
595 err = ltq_etop_mdio_init(dev);
596 if (err)
597 goto err_netdev;
598 return 0;
599
600err_netdev:
601 unregister_netdev(dev);
602 free_netdev(dev);
603err_hw:
604 ltq_etop_hw_exit(dev);
605 return err;
606}
607
608static void
609ltq_etop_tx_timeout(struct net_device *dev, unsigned int txqueue)
610{
611 int err;
612
613 ltq_etop_hw_exit(dev);
614 err = ltq_etop_hw_init(dev);
615 if (err)
616 goto err_hw;
617 netif_trans_update(dev);
618 netif_wake_queue(dev);
619 return;
620
621err_hw:
622 ltq_etop_hw_exit(dev);
623 netdev_err(dev, "failed to restart etop after TX timeout\n");
624}
625
626static const struct net_device_ops ltq_eth_netdev_ops = {
627 .ndo_open = ltq_etop_open,
628 .ndo_stop = ltq_etop_stop,
629 .ndo_start_xmit = ltq_etop_tx,
630 .ndo_change_mtu = ltq_etop_change_mtu,
631 .ndo_eth_ioctl = phy_do_ioctl,
632 .ndo_set_mac_address = ltq_etop_set_mac_address,
633 .ndo_validate_addr = eth_validate_addr,
634 .ndo_set_rx_mode = ltq_etop_set_multicast_list,
635 .ndo_select_queue = dev_pick_tx_zero,
636 .ndo_init = ltq_etop_init,
637 .ndo_tx_timeout = ltq_etop_tx_timeout,
638};
639
640static int __init
641ltq_etop_probe(struct platform_device *pdev)
642{
643 struct net_device *dev;
644 struct ltq_etop_priv *priv;
645 struct resource *res;
646 int err;
647 int i;
648
649 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
650 if (!res) {
651 dev_err(&pdev->dev, "failed to get etop resource\n");
652 err = -ENOENT;
653 goto err_out;
654 }
655
656 res = devm_request_mem_region(&pdev->dev, res->start,
657 resource_size(res), dev_name(&pdev->dev));
658 if (!res) {
659 dev_err(&pdev->dev, "failed to request etop resource\n");
660 err = -EBUSY;
661 goto err_out;
662 }
663
664 ltq_etop_membase = devm_ioremap(&pdev->dev, res->start,
665 resource_size(res));
666 if (!ltq_etop_membase) {
667 dev_err(&pdev->dev, "failed to remap etop engine %d\n",
668 pdev->id);
669 err = -ENOMEM;
670 goto err_out;
671 }
672
673 dev = alloc_etherdev_mq(sizeof(struct ltq_etop_priv), 4);
674 if (!dev) {
675 err = -ENOMEM;
676 goto err_out;
677 }
678 strcpy(dev->name, "eth%d");
679 dev->netdev_ops = <q_eth_netdev_ops;
680 dev->ethtool_ops = <q_etop_ethtool_ops;
681 priv = netdev_priv(dev);
682 priv->res = res;
683 priv->pdev = pdev;
684 priv->pldata = dev_get_platdata(&pdev->dev);
685 priv->netdev = dev;
686 spin_lock_init(&priv->lock);
687 SET_NETDEV_DEV(dev, &pdev->dev);
688
689 err = device_property_read_u32(&pdev->dev, "lantiq,tx-burst-length", &priv->tx_burst_len);
690 if (err < 0) {
691 dev_err(&pdev->dev, "unable to read tx-burst-length property\n");
692 goto err_free;
693 }
694
695 err = device_property_read_u32(&pdev->dev, "lantiq,rx-burst-length", &priv->rx_burst_len);
696 if (err < 0) {
697 dev_err(&pdev->dev, "unable to read rx-burst-length property\n");
698 goto err_free;
699 }
700
701 for (i = 0; i < MAX_DMA_CHAN; i++) {
702 if (IS_TX(i))
703 netif_napi_add_weight(dev, &priv->ch[i].napi,
704 ltq_etop_poll_tx, 8);
705 else if (IS_RX(i))
706 netif_napi_add_weight(dev, &priv->ch[i].napi,
707 ltq_etop_poll_rx, 32);
708 priv->ch[i].netdev = dev;
709 }
710
711 err = register_netdev(dev);
712 if (err)
713 goto err_free;
714
715 platform_set_drvdata(pdev, dev);
716 return 0;
717
718err_free:
719 free_netdev(dev);
720err_out:
721 return err;
722}
723
724static void ltq_etop_remove(struct platform_device *pdev)
725{
726 struct net_device *dev = platform_get_drvdata(pdev);
727
728 if (dev) {
729 netif_tx_stop_all_queues(dev);
730 ltq_etop_hw_exit(dev);
731 ltq_etop_mdio_cleanup(dev);
732 unregister_netdev(dev);
733 }
734}
735
736static struct platform_driver ltq_mii_driver = {
737 .remove_new = ltq_etop_remove,
738 .driver = {
739 .name = "ltq_etop",
740 },
741};
742
743static int __init
744init_ltq_etop(void)
745{
746 int ret = platform_driver_probe(<q_mii_driver, ltq_etop_probe);
747
748 if (ret)
749 pr_err("ltq_etop: Error registering platform driver!");
750 return ret;
751}
752
753static void __exit
754exit_ltq_etop(void)
755{
756 platform_driver_unregister(<q_mii_driver);
757}
758
759module_init(init_ltq_etop);
760module_exit(exit_ltq_etop);
761
762MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
763MODULE_DESCRIPTION("Lantiq SoC ETOP");
764MODULE_LICENSE("GPL");