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[mirror_ubuntu-artful-kernel.git] / drivers / net / ethernet / mediatek / mtk_eth_soc.c
CommitLineData
656e7052
JC		 1/* This program is free software; you can redistribute it and/or modify
2 * it under the terms of the GNU General Public License as published by
3 * the Free Software Foundation; version 2 of the License
4 *
5 * This program is distributed in the hope that it will be useful,
6 * but WITHOUT ANY WARRANTY; without even the implied warranty of
7 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
8 * GNU General Public License for more details.
9 *
10 * Copyright (C) 2009-2016 John Crispin <blogic@openwrt.org>
11 * Copyright (C) 2009-2016 Felix Fietkau <nbd@openwrt.org>
12 * Copyright (C) 2013-2016 Michael Lee <igvtee@gmail.com>
13 */
14
15#include <linux/of_device.h>
16#include <linux/of_mdio.h>
17#include <linux/of_net.h>
18#include <linux/mfd/syscon.h>
19#include <linux/regmap.h>
20#include <linux/clk.h>
21#include <linux/if_vlan.h>
22#include <linux/reset.h>
23#include <linux/tcp.h>
24
25#include "mtk_eth_soc.h"
26
27static int mtk_msg_level = -1;
28module_param_named(msg_level, mtk_msg_level, int, 0);
29MODULE_PARM_DESC(msg_level, "Message level (-1=defaults,0=none,...,16=all)");
30
31#define MTK_ETHTOOL_STAT(x) { #x, \
32 offsetof(struct mtk_hw_stats, x) / sizeof(u64) }
33
34/* strings used by ethtool */
35static const struct mtk_ethtool_stats {
36 char str[ETH_GSTRING_LEN];
37 u32 offset;
38} mtk_ethtool_stats[] = {
39 MTK_ETHTOOL_STAT(tx_bytes),
40 MTK_ETHTOOL_STAT(tx_packets),
41 MTK_ETHTOOL_STAT(tx_skip),
42 MTK_ETHTOOL_STAT(tx_collisions),
43 MTK_ETHTOOL_STAT(rx_bytes),
44 MTK_ETHTOOL_STAT(rx_packets),
45 MTK_ETHTOOL_STAT(rx_overflow),
46 MTK_ETHTOOL_STAT(rx_fcs_errors),
47 MTK_ETHTOOL_STAT(rx_short_errors),
48 MTK_ETHTOOL_STAT(rx_long_errors),
49 MTK_ETHTOOL_STAT(rx_checksum_errors),
50 MTK_ETHTOOL_STAT(rx_flow_control_packets),
51};
52
53void mtk_w32(struct mtk_eth *eth, u32 val, unsigned reg)
54{
55 __raw_writel(val, eth->base + reg);
56}
57
58u32 mtk_r32(struct mtk_eth *eth, unsigned reg)
59{
60 return __raw_readl(eth->base + reg);
61}
62
63static int mtk_mdio_busy_wait(struct mtk_eth *eth)
64{
65 unsigned long t_start = jiffies;
66
67 while (1) {
68 if (!(mtk_r32(eth, MTK_PHY_IAC) & PHY_IAC_ACCESS))
69 return 0;
70 if (time_after(jiffies, t_start + PHY_IAC_TIMEOUT))
71 break;
72 usleep_range(10, 20);
73 }
74
75 dev_err(eth->dev, "mdio: MDIO timeout\n");
76 return -1;
77}
78
79u32 _mtk_mdio_write(struct mtk_eth *eth, u32 phy_addr,
80 u32 phy_register, u32 write_data)
81{
82 if (mtk_mdio_busy_wait(eth))
83 return -1;
84
85 write_data &= 0xffff;
86
87 mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START | PHY_IAC_WRITE |
88 (phy_register << PHY_IAC_REG_SHIFT) |
89 (phy_addr << PHY_IAC_ADDR_SHIFT) | write_data,
90 MTK_PHY_IAC);
91
92 if (mtk_mdio_busy_wait(eth))
93 return -1;
94
95 return 0;
96}
97
98u32 _mtk_mdio_read(struct mtk_eth *eth, int phy_addr, int phy_reg)
99{
100 u32 d;
101
102 if (mtk_mdio_busy_wait(eth))
103 return 0xffff;
104
105 mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START | PHY_IAC_READ |
106 (phy_reg << PHY_IAC_REG_SHIFT) |
107 (phy_addr << PHY_IAC_ADDR_SHIFT),
108 MTK_PHY_IAC);
109
110 if (mtk_mdio_busy_wait(eth))
111 return 0xffff;
112
113 d = mtk_r32(eth, MTK_PHY_IAC) & 0xffff;
114
115 return d;
116}
117
118static int mtk_mdio_write(struct mii_bus *bus, int phy_addr,
119 int phy_reg, u16 val)
120{
121 struct mtk_eth *eth = bus->priv;
122
123 return _mtk_mdio_write(eth, phy_addr, phy_reg, val);
124}
125
126static int mtk_mdio_read(struct mii_bus *bus, int phy_addr, int phy_reg)
127{
128 struct mtk_eth *eth = bus->priv;
129
130 return _mtk_mdio_read(eth, phy_addr, phy_reg);
131}
132
133static void mtk_phy_link_adjust(struct net_device *dev)
134{
135 struct mtk_mac *mac = netdev_priv(dev);
08ef55c6
JC		 136 u16 lcl_adv = 0, rmt_adv = 0;
137 u8 flowctrl;
656e7052
JC		 138 u32 mcr = MAC_MCR_MAX_RX_1536 | MAC_MCR_IPG_CFG |
139 MAC_MCR_FORCE_MODE | MAC_MCR_TX_EN |
140 MAC_MCR_RX_EN | MAC_MCR_BACKOFF_EN |
141 MAC_MCR_BACKPR_EN;
142
143 switch (mac->phy_dev->speed) {
144 case SPEED_1000:
145 mcr |= MAC_MCR_SPEED_1000;
146 break;
147 case SPEED_100:
148 mcr |= MAC_MCR_SPEED_100;
149 break;
150 };
151
152 if (mac->phy_dev->link)
153 mcr |= MAC_MCR_FORCE_LINK;
154
08ef55c6 155 if (mac->phy_dev->duplex) {
656e7052
JC		 156 mcr |= MAC_MCR_FORCE_DPX;
157
08ef55c6
JC		 158 if (mac->phy_dev->pause)
159 rmt_adv = LPA_PAUSE_CAP;
160 if (mac->phy_dev->asym_pause)
161 rmt_adv |= LPA_PAUSE_ASYM;
162
163 if (mac->phy_dev->advertising & ADVERTISED_Pause)
164 lcl_adv |= ADVERTISE_PAUSE_CAP;
165 if (mac->phy_dev->advertising & ADVERTISED_Asym_Pause)
166 lcl_adv |= ADVERTISE_PAUSE_ASYM;
167
168 flowctrl = mii_resolve_flowctrl_fdx(lcl_adv, rmt_adv);
169
170 if (flowctrl & FLOW_CTRL_TX)
171 mcr |= MAC_MCR_FORCE_TX_FC;
172 if (flowctrl & FLOW_CTRL_RX)
173 mcr |= MAC_MCR_FORCE_RX_FC;
174
175 netif_dbg(mac->hw, link, dev, "rx pause %s, tx pause %s\n",
176 flowctrl & FLOW_CTRL_RX ? "enabled" : "disabled",
177 flowctrl & FLOW_CTRL_TX ? "enabled" : "disabled");
178 }
656e7052
JC		 179
180 mtk_w32(mac->hw, mcr, MTK_MAC_MCR(mac->id));
181
182 if (mac->phy_dev->link)
183 netif_carrier_on(dev);
184 else
185 netif_carrier_off(dev);
186}
187
188static int mtk_phy_connect_node(struct mtk_eth *eth, struct mtk_mac *mac,
189 struct device_node *phy_node)
190{
191 const __be32 *_addr = NULL;
192 struct phy_device *phydev;
193 int phy_mode, addr;
194
195 _addr = of_get_property(phy_node, "reg", NULL);
196
197 if (!_addr || (be32_to_cpu(*_addr) >= 0x20)) {
198 pr_err("%s: invalid phy address\n", phy_node->name);
199 return -EINVAL;
200 }
201 addr = be32_to_cpu(*_addr);
202 phy_mode = of_get_phy_mode(phy_node);
203 if (phy_mode < 0) {
204 dev_err(eth->dev, "incorrect phy-mode %d\n", phy_mode);
205 return -EINVAL;
206 }
207
208 phydev = of_phy_connect(eth->netdev[mac->id], phy_node,
209 mtk_phy_link_adjust, 0, phy_mode);
977bc20c 210 if (!phydev) {
656e7052 211 dev_err(eth->dev, "could not connect to PHY\n");
977bc20c 212 return -ENODEV;
656e7052
JC		 213 }
214
215 dev_info(eth->dev,
216 "connected mac %d to PHY at %s [uid=%08x, driver=%s]\n",
217 mac->id, phydev_name(phydev), phydev->phy_id,
218 phydev->drv->name);
219
220 mac->phy_dev = phydev;
221
222 return 0;
223}
224
225static int mtk_phy_connect(struct mtk_mac *mac)
226{
227 struct mtk_eth *eth = mac->hw;
228 struct device_node *np;
229 u32 val, ge_mode;
230
231 np = of_parse_phandle(mac->of_node, "phy-handle", 0);
0c72c50f
JC		 232 if (!np && of_phy_is_fixed_link(mac->of_node))
233 if (!of_phy_register_fixed_link(mac->of_node))
234 np = of_node_get(mac->of_node);
656e7052
JC		 235 if (!np)
236 return -ENODEV;
237
238 switch (of_get_phy_mode(np)) {
37920fce
JC		 239 case PHY_INTERFACE_MODE_RGMII_TXID:
240 case PHY_INTERFACE_MODE_RGMII_RXID:
241 case PHY_INTERFACE_MODE_RGMII_ID:
656e7052
JC		 242 case PHY_INTERFACE_MODE_RGMII:
243 ge_mode = 0;
244 break;
245 case PHY_INTERFACE_MODE_MII:
246 ge_mode = 1;
247 break;
248 case PHY_INTERFACE_MODE_RMII:
249 ge_mode = 2;
250 break;
251 default:
252 dev_err(eth->dev, "invalid phy_mode\n");
253 return -1;
254 }
255
256 /* put the gmac into the right mode */
257 regmap_read(eth->ethsys, ETHSYS_SYSCFG0, &val);
258 val &= ~SYSCFG0_GE_MODE(SYSCFG0_GE_MASK, mac->id);
259 val |= SYSCFG0_GE_MODE(ge_mode, mac->id);
260 regmap_write(eth->ethsys, ETHSYS_SYSCFG0, val);
261
262 mtk_phy_connect_node(eth, mac, np);
263 mac->phy_dev->autoneg = AUTONEG_ENABLE;
264 mac->phy_dev->speed = 0;
265 mac->phy_dev->duplex = 0;
08ef55c6
JC		 266 mac->phy_dev->supported &= PHY_GBIT_FEATURES | SUPPORTED_Pause |
267 SUPPORTED_Asym_Pause;
656e7052
JC		 268 mac->phy_dev->advertising = mac->phy_dev->supported |
269 ADVERTISED_Autoneg;
270 phy_start_aneg(mac->phy_dev);
271
272 return 0;
273}
274
275static int mtk_mdio_init(struct mtk_eth *eth)
276{
277 struct device_node *mii_np;
278 int err;
279
280 mii_np = of_get_child_by_name(eth->dev->of_node, "mdio-bus");
281 if (!mii_np) {
282 dev_err(eth->dev, "no %s child node found", "mdio-bus");
283 return -ENODEV;
284 }
285
286 if (!of_device_is_available(mii_np)) {
287 err = 0;
288 goto err_put_node;
289 }
290
291 eth->mii_bus = mdiobus_alloc();
292 if (!eth->mii_bus) {
293 err = -ENOMEM;
294 goto err_put_node;
295 }
296
297 eth->mii_bus->name = "mdio";
298 eth->mii_bus->read = mtk_mdio_read;
299 eth->mii_bus->write = mtk_mdio_write;
300 eth->mii_bus->priv = eth;
301 eth->mii_bus->parent = eth->dev;
302
303 snprintf(eth->mii_bus->id, MII_BUS_ID_SIZE, "%s", mii_np->name);
304 err = of_mdiobus_register(eth->mii_bus, mii_np);
305 if (err)
306 goto err_free_bus;
307
308 return 0;
309
310err_free_bus:
207bdf18 311 mdiobus_free(eth->mii_bus);
656e7052
JC		 312
313err_put_node:
314 of_node_put(mii_np);
315 eth->mii_bus = NULL;
316 return err;
317}
318
319static void mtk_mdio_cleanup(struct mtk_eth *eth)
320{
321 if (!eth->mii_bus)
322 return;
323
324 mdiobus_unregister(eth->mii_bus);
325 of_node_put(eth->mii_bus->dev.of_node);
207bdf18 326 mdiobus_free(eth->mii_bus);
656e7052
JC		 327}
328
329static inline void mtk_irq_disable(struct mtk_eth *eth, u32 mask)
330{
331 u32 val;
332
333 val = mtk_r32(eth, MTK_QDMA_INT_MASK);
334 mtk_w32(eth, val & ~mask, MTK_QDMA_INT_MASK);
335 /* flush write */
336 mtk_r32(eth, MTK_QDMA_INT_MASK);
337}
338
339static inline void mtk_irq_enable(struct mtk_eth *eth, u32 mask)
340{
341 u32 val;
342
343 val = mtk_r32(eth, MTK_QDMA_INT_MASK);
344 mtk_w32(eth, val | mask, MTK_QDMA_INT_MASK);
345 /* flush write */
346 mtk_r32(eth, MTK_QDMA_INT_MASK);
347}
348
349static int mtk_set_mac_address(struct net_device *dev, void *p)
350{
351 int ret = eth_mac_addr(dev, p);
352 struct mtk_mac *mac = netdev_priv(dev);
353 const char *macaddr = dev->dev_addr;
354 unsigned long flags;
355
356 if (ret)
357 return ret;
358
359 spin_lock_irqsave(&mac->hw->page_lock, flags);
360 mtk_w32(mac->hw, (macaddr[0] << 8) | macaddr[1],
361 MTK_GDMA_MAC_ADRH(mac->id));
362 mtk_w32(mac->hw, (macaddr[2] << 24) | (macaddr[3] << 16) |
363 (macaddr[4] << 8) | macaddr[5],
364 MTK_GDMA_MAC_ADRL(mac->id));
365 spin_unlock_irqrestore(&mac->hw->page_lock, flags);
366
367 return 0;
368}
369
370void mtk_stats_update_mac(struct mtk_mac *mac)
371{
372 struct mtk_hw_stats *hw_stats = mac->hw_stats;
373 unsigned int base = MTK_GDM1_TX_GBCNT;
374 u64 stats;
375
376 base += hw_stats->reg_offset;
377
378 u64_stats_update_begin(&hw_stats->syncp);
379
380 hw_stats->rx_bytes += mtk_r32(mac->hw, base);
381 stats = mtk_r32(mac->hw, base + 0x04);
382 if (stats)
383 hw_stats->rx_bytes += (stats << 32);
384 hw_stats->rx_packets += mtk_r32(mac->hw, base + 0x08);
385 hw_stats->rx_overflow += mtk_r32(mac->hw, base + 0x10);
386 hw_stats->rx_fcs_errors += mtk_r32(mac->hw, base + 0x14);
387 hw_stats->rx_short_errors += mtk_r32(mac->hw, base + 0x18);
388 hw_stats->rx_long_errors += mtk_r32(mac->hw, base + 0x1c);
389 hw_stats->rx_checksum_errors += mtk_r32(mac->hw, base + 0x20);
390 hw_stats->rx_flow_control_packets +=
391 mtk_r32(mac->hw, base + 0x24);
392 hw_stats->tx_skip += mtk_r32(mac->hw, base + 0x28);
393 hw_stats->tx_collisions += mtk_r32(mac->hw, base + 0x2c);
394 hw_stats->tx_bytes += mtk_r32(mac->hw, base + 0x30);
395 stats = mtk_r32(mac->hw, base + 0x34);
396 if (stats)
397 hw_stats->tx_bytes += (stats << 32);
398 hw_stats->tx_packets += mtk_r32(mac->hw, base + 0x38);
399 u64_stats_update_end(&hw_stats->syncp);
400}
401
402static void mtk_stats_update(struct mtk_eth *eth)
403{
404 int i;
405
406 for (i = 0; i < MTK_MAC_COUNT; i++) {
407 if (!eth->mac[i] || !eth->mac[i]->hw_stats)
408 continue;
409 if (spin_trylock(&eth->mac[i]->hw_stats->stats_lock)) {
410 mtk_stats_update_mac(eth->mac[i]);
411 spin_unlock(&eth->mac[i]->hw_stats->stats_lock);
412 }
413 }
414}
415
416static struct rtnl_link_stats64 *mtk_get_stats64(struct net_device *dev,
417 struct rtnl_link_stats64 *storage)
418{
419 struct mtk_mac *mac = netdev_priv(dev);
420 struct mtk_hw_stats *hw_stats = mac->hw_stats;
421 unsigned int start;
422
423 if (netif_running(dev) && netif_device_present(dev)) {
424 if (spin_trylock(&hw_stats->stats_lock)) {
425 mtk_stats_update_mac(mac);
426 spin_unlock(&hw_stats->stats_lock);
427 }
428 }
429
430 do {
431 start = u64_stats_fetch_begin_irq(&hw_stats->syncp);
432 storage->rx_packets = hw_stats->rx_packets;
433 storage->tx_packets = hw_stats->tx_packets;
434 storage->rx_bytes = hw_stats->rx_bytes;
435 storage->tx_bytes = hw_stats->tx_bytes;
436 storage->collisions = hw_stats->tx_collisions;
437 storage->rx_length_errors = hw_stats->rx_short_errors +
438 hw_stats->rx_long_errors;
439 storage->rx_over_errors = hw_stats->rx_overflow;
440 storage->rx_crc_errors = hw_stats->rx_fcs_errors;
441 storage->rx_errors = hw_stats->rx_checksum_errors;
442 storage->tx_aborted_errors = hw_stats->tx_skip;
443 } while (u64_stats_fetch_retry_irq(&hw_stats->syncp, start));
444
445 storage->tx_errors = dev->stats.tx_errors;
446 storage->rx_dropped = dev->stats.rx_dropped;
447 storage->tx_dropped = dev->stats.tx_dropped;
448
449 return storage;
450}
451
452static inline int mtk_max_frag_size(int mtu)
453{
454 /* make sure buf_size will be at least MTK_MAX_RX_LENGTH */
455 if (mtu + MTK_RX_ETH_HLEN < MTK_MAX_RX_LENGTH)
456 mtu = MTK_MAX_RX_LENGTH - MTK_RX_ETH_HLEN;
457
458 return SKB_DATA_ALIGN(MTK_RX_HLEN + mtu) +
459 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
460}
461
462static inline int mtk_max_buf_size(int frag_size)
463{
464 int buf_size = frag_size - NET_SKB_PAD - NET_IP_ALIGN -
465 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
466
467 WARN_ON(buf_size < MTK_MAX_RX_LENGTH);
468
469 return buf_size;
470}
471
472static inline void mtk_rx_get_desc(struct mtk_rx_dma *rxd,
473 struct mtk_rx_dma *dma_rxd)
474{
475 rxd->rxd1 = READ_ONCE(dma_rxd->rxd1);
476 rxd->rxd2 = READ_ONCE(dma_rxd->rxd2);
477 rxd->rxd3 = READ_ONCE(dma_rxd->rxd3);
478 rxd->rxd4 = READ_ONCE(dma_rxd->rxd4);
479}
480
481/* the qdma core needs scratch memory to be setup */
482static int mtk_init_fq_dma(struct mtk_eth *eth)
483{
6aab1a62 484 dma_addr_t phy_ring_head, phy_ring_tail;
656e7052
JC		 485 int cnt = MTK_DMA_SIZE;
486 dma_addr_t dma_addr;
487 int i;
488
489 eth->scratch_ring = dma_alloc_coherent(eth->dev,
490 cnt * sizeof(struct mtk_tx_dma),
491 &phy_ring_head,
492 GFP_ATOMIC | __GFP_ZERO);
493 if (unlikely(!eth->scratch_ring))
494 return -ENOMEM;
495
496 eth->scratch_head = kcalloc(cnt, MTK_QDMA_PAGE_SIZE,
497 GFP_KERNEL);
562c5a70
JC		 498 if (unlikely(!eth->scratch_head))
499 return -ENOMEM;
500
656e7052
JC		 501 dma_addr = dma_map_single(eth->dev,
502 eth->scratch_head, cnt * MTK_QDMA_PAGE_SIZE,
503 DMA_FROM_DEVICE);
504 if (unlikely(dma_mapping_error(eth->dev, dma_addr)))
505 return -ENOMEM;
506
507 memset(eth->scratch_ring, 0x0, sizeof(struct mtk_tx_dma) * cnt);
508 phy_ring_tail = phy_ring_head +
509 (sizeof(struct mtk_tx_dma) * (cnt - 1));
510
511 for (i = 0; i < cnt; i++) {
512 eth->scratch_ring[i].txd1 =
513 (dma_addr + (i * MTK_QDMA_PAGE_SIZE));
514 if (i < cnt - 1)
515 eth->scratch_ring[i].txd2 = (phy_ring_head +
516 ((i + 1) * sizeof(struct mtk_tx_dma)));
517 eth->scratch_ring[i].txd3 = TX_DMA_SDL(MTK_QDMA_PAGE_SIZE);
518 }
519
520 mtk_w32(eth, phy_ring_head, MTK_QDMA_FQ_HEAD);
521 mtk_w32(eth, phy_ring_tail, MTK_QDMA_FQ_TAIL);
522 mtk_w32(eth, (cnt << 16) | cnt, MTK_QDMA_FQ_CNT);
523 mtk_w32(eth, MTK_QDMA_PAGE_SIZE << 16, MTK_QDMA_FQ_BLEN);
524
525 return 0;
526}
527
528static inline void *mtk_qdma_phys_to_virt(struct mtk_tx_ring *ring, u32 desc)
529{
530 void *ret = ring->dma;
531
532 return ret + (desc - ring->phys);
533}
534
535static inline struct mtk_tx_buf *mtk_desc_to_tx_buf(struct mtk_tx_ring *ring,
536 struct mtk_tx_dma *txd)
537{
538 int idx = txd - ring->dma;
539
540 return &ring->buf[idx];
541}
542
543static void mtk_tx_unmap(struct device *dev, struct mtk_tx_buf *tx_buf)
544{
545 if (tx_buf->flags & MTK_TX_FLAGS_SINGLE0) {
546 dma_unmap_single(dev,
547 dma_unmap_addr(tx_buf, dma_addr0),
548 dma_unmap_len(tx_buf, dma_len0),
549 DMA_TO_DEVICE);
550 } else if (tx_buf->flags & MTK_TX_FLAGS_PAGE0) {
551 dma_unmap_page(dev,
552 dma_unmap_addr(tx_buf, dma_addr0),
553 dma_unmap_len(tx_buf, dma_len0),
554 DMA_TO_DEVICE);
555 }
556 tx_buf->flags = 0;
557 if (tx_buf->skb &&
558 (tx_buf->skb != (struct sk_buff *)MTK_DMA_DUMMY_DESC))
559 dev_kfree_skb_any(tx_buf->skb);
560 tx_buf->skb = NULL;
561}
562
563static int mtk_tx_map(struct sk_buff *skb, struct net_device *dev,
564 int tx_num, struct mtk_tx_ring *ring, bool gso)
565{
566 struct mtk_mac *mac = netdev_priv(dev);
567 struct mtk_eth *eth = mac->hw;
568 struct mtk_tx_dma *itxd, *txd;
569 struct mtk_tx_buf *tx_buf;
656e7052
JC		 570 dma_addr_t mapped_addr;
571 unsigned int nr_frags;
572 int i, n_desc = 1;
573 u32 txd4 = 0;
574
575 itxd = ring->next_free;
576 if (itxd == ring->last_free)
577 return -ENOMEM;
578
579 /* set the forward port */
580 txd4 |= (mac->id + 1) << TX_DMA_FPORT_SHIFT;
581
582 tx_buf = mtk_desc_to_tx_buf(ring, itxd);
583 memset(tx_buf, 0, sizeof(*tx_buf));
584
585 if (gso)
586 txd4 |= TX_DMA_TSO;
587
588 /* TX Checksum offload */
589 if (skb->ip_summed == CHECKSUM_PARTIAL)
590 txd4 |= TX_DMA_CHKSUM;
591
592 /* VLAN header offload */
593 if (skb_vlan_tag_present(skb))
594 txd4 |= TX_DMA_INS_VLAN | skb_vlan_tag_get(skb);
595
596 mapped_addr = dma_map_single(&dev->dev, skb->data,
597 skb_headlen(skb), DMA_TO_DEVICE);
598 if (unlikely(dma_mapping_error(&dev->dev, mapped_addr)))
599 return -ENOMEM;
600
656e7052
JC		 601 WRITE_ONCE(itxd->txd1, mapped_addr);
602 tx_buf->flags |= MTK_TX_FLAGS_SINGLE0;
603 dma_unmap_addr_set(tx_buf, dma_addr0, mapped_addr);
604 dma_unmap_len_set(tx_buf, dma_len0, skb_headlen(skb));
605
606 /* TX SG offload */
607 txd = itxd;
608 nr_frags = skb_shinfo(skb)->nr_frags;
609 for (i = 0; i < nr_frags; i++) {
610 struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i];
611 unsigned int offset = 0;
612 int frag_size = skb_frag_size(frag);
613
614 while (frag_size) {
615 bool last_frag = false;
616 unsigned int frag_map_size;
617
618 txd = mtk_qdma_phys_to_virt(ring, txd->txd2);
619 if (txd == ring->last_free)
620 goto err_dma;
621
622 n_desc++;
623 frag_map_size = min(frag_size, MTK_TX_DMA_BUF_LEN);
624 mapped_addr = skb_frag_dma_map(&dev->dev, frag, offset,
625 frag_map_size,
626 DMA_TO_DEVICE);
627 if (unlikely(dma_mapping_error(&dev->dev, mapped_addr)))
628 goto err_dma;
629
630 if (i == nr_frags - 1 &&
631 (frag_size - frag_map_size) == 0)
632 last_frag = true;
633
634 WRITE_ONCE(txd->txd1, mapped_addr);
635 WRITE_ONCE(txd->txd3, (TX_DMA_SWC |
636 TX_DMA_PLEN0(frag_map_size) |
369f0453 637 last_frag * TX_DMA_LS0));
656e7052
JC		 638 WRITE_ONCE(txd->txd4, 0);
639
640 tx_buf->skb = (struct sk_buff *)MTK_DMA_DUMMY_DESC;
641 tx_buf = mtk_desc_to_tx_buf(ring, txd);
642 memset(tx_buf, 0, sizeof(*tx_buf));
643
644 tx_buf->flags |= MTK_TX_FLAGS_PAGE0;
645 dma_unmap_addr_set(tx_buf, dma_addr0, mapped_addr);
646 dma_unmap_len_set(tx_buf, dma_len0, frag_map_size);
647 frag_size -= frag_map_size;
648 offset += frag_map_size;
649 }
650 }
651
652 /* store skb to cleanup */
653 tx_buf->skb = skb;
654
655 WRITE_ONCE(itxd->txd4, txd4);
656 WRITE_ONCE(itxd->txd3, (TX_DMA_SWC | TX_DMA_PLEN0(skb_headlen(skb)) |
657 (!nr_frags * TX_DMA_LS0)));
658
656e7052
JC		 659 netdev_sent_queue(dev, skb->len);
660 skb_tx_timestamp(skb);
661
662 ring->next_free = mtk_qdma_phys_to_virt(ring, txd->txd2);
663 atomic_sub(n_desc, &ring->free_count);
664
665 /* make sure that all changes to the dma ring are flushed before we
666 * continue
667 */
668 wmb();
669
670 if (netif_xmit_stopped(netdev_get_tx_queue(dev, 0)) || !skb->xmit_more)
671 mtk_w32(eth, txd->txd2, MTK_QTX_CTX_PTR);
672
673 return 0;
674
675err_dma:
676 do {
677 tx_buf = mtk_desc_to_tx_buf(ring, txd);
678
679 /* unmap dma */
680 mtk_tx_unmap(&dev->dev, tx_buf);
681
682 itxd->txd3 = TX_DMA_LS0 | TX_DMA_OWNER_CPU;
683 itxd = mtk_qdma_phys_to_virt(ring, itxd->txd2);
684 } while (itxd != txd);
685
686 return -ENOMEM;
687}
688
689static inline int mtk_cal_txd_req(struct sk_buff *skb)
690{
691 int i, nfrags;
692 struct skb_frag_struct *frag;
693
694 nfrags = 1;
695 if (skb_is_gso(skb)) {
696 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
697 frag = &skb_shinfo(skb)->frags[i];
698 nfrags += DIV_ROUND_UP(frag->size, MTK_TX_DMA_BUF_LEN);
699 }
700 } else {
701 nfrags += skb_shinfo(skb)->nr_frags;
702 }
703
beeb4ca4 704 return nfrags;
656e7052
JC		 705}
706
13c822f6
JC		 707static void mtk_wake_queue(struct mtk_eth *eth)
708{
709 int i;
710
711 for (i = 0; i < MTK_MAC_COUNT; i++) {
712 if (!eth->netdev[i])
713 continue;
714 netif_wake_queue(eth->netdev[i]);
715 }
716}
717
718static void mtk_stop_queue(struct mtk_eth *eth)
719{
720 int i;
721
722 for (i = 0; i < MTK_MAC_COUNT; i++) {
723 if (!eth->netdev[i])
724 continue;
725 netif_stop_queue(eth->netdev[i]);
726 }
727}
728
656e7052
JC		 729static int mtk_start_xmit(struct sk_buff *skb, struct net_device *dev)
730{
731 struct mtk_mac *mac = netdev_priv(dev);
732 struct mtk_eth *eth = mac->hw;
733 struct mtk_tx_ring *ring = &eth->tx_ring;
734 struct net_device_stats *stats = &dev->stats;
34c2e4c9 735 unsigned long flags;
656e7052
JC		 736 bool gso = false;
737 int tx_num;
738
34c2e4c9
JC		 739 /* normally we can rely on the stack not calling this more than once,
740 * however we have 2 queues running on the same ring so we need to lock
741 * the ring access
742 */
743 spin_lock_irqsave(&eth->page_lock, flags);
744
656e7052
JC		 745 tx_num = mtk_cal_txd_req(skb);
746 if (unlikely(atomic_read(&ring->free_count) <= tx_num)) {
13c822f6 747 mtk_stop_queue(eth);
656e7052
JC		 748 netif_err(eth, tx_queued, dev,
749 "Tx Ring full when queue awake!\n");
34c2e4c9 750 spin_unlock_irqrestore(&eth->page_lock, flags);
656e7052
JC		 751 return NETDEV_TX_BUSY;
752 }
753
754 /* TSO: fill MSS info in tcp checksum field */
755 if (skb_is_gso(skb)) {
756 if (skb_cow_head(skb, 0)) {
757 netif_warn(eth, tx_err, dev,
758 "GSO expand head fail.\n");
759 goto drop;
760 }
761
762 if (skb_shinfo(skb)->gso_type &
763 (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)) {
764 gso = true;
765 tcp_hdr(skb)->check = htons(skb_shinfo(skb)->gso_size);
766 }
767 }
768
769 if (mtk_tx_map(skb, dev, tx_num, ring, gso) < 0)
770 goto drop;
771
772 if (unlikely(atomic_read(&ring->free_count) <= ring->thresh)) {
13c822f6 773 mtk_stop_queue(eth);
656e7052
JC		 774 if (unlikely(atomic_read(&ring->free_count) >
775 ring->thresh))
13c822f6 776 mtk_wake_queue(eth);
656e7052 777 }
34c2e4c9 778 spin_unlock_irqrestore(&eth->page_lock, flags);
656e7052
JC		 779
780 return NETDEV_TX_OK;
781
782drop:
34c2e4c9 783 spin_unlock_irqrestore(&eth->page_lock, flags);
656e7052
JC		 784 stats->tx_dropped++;
785 dev_kfree_skb(skb);
786 return NETDEV_TX_OK;
787}
788
789static int mtk_poll_rx(struct napi_struct *napi, int budget,
790 struct mtk_eth *eth, u32 rx_intr)
791{
792 struct mtk_rx_ring *ring = &eth->rx_ring;
793 int idx = ring->calc_idx;
794 struct sk_buff *skb;
795 u8 *data, *new_data;
796 struct mtk_rx_dma *rxd, trxd;
797 int done = 0;
798
799 while (done < budget) {
800 struct net_device *netdev;
801 unsigned int pktlen;
802 dma_addr_t dma_addr;
803 int mac = 0;
804
805 idx = NEXT_RX_DESP_IDX(idx);
806 rxd = &ring->dma[idx];
807 data = ring->data[idx];
808
809 mtk_rx_get_desc(&trxd, rxd);
810 if (!(trxd.rxd2 & RX_DMA_DONE))
811 break;
812
813 /* find out which mac the packet come from. values start at 1 */
814 mac = (trxd.rxd4 >> RX_DMA_FPORT_SHIFT) &
815 RX_DMA_FPORT_MASK;
816 mac--;
817
818 netdev = eth->netdev[mac];
819
820 /* alloc new buffer */
821 new_data = napi_alloc_frag(ring->frag_size);
822 if (unlikely(!new_data)) {
823 netdev->stats.rx_dropped++;
824 goto release_desc;
825 }
826 dma_addr = dma_map_single(&eth->netdev[mac]->dev,
827 new_data + NET_SKB_PAD,
828 ring->buf_size,
829 DMA_FROM_DEVICE);
830 if (unlikely(dma_mapping_error(&netdev->dev, dma_addr))) {
831 skb_free_frag(new_data);
832 goto release_desc;
833 }
834
835 /* receive data */
836 skb = build_skb(data, ring->frag_size);
837 if (unlikely(!skb)) {
838 put_page(virt_to_head_page(new_data));
839 goto release_desc;
840 }
841 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
842
843 dma_unmap_single(&netdev->dev, trxd.rxd1,
844 ring->buf_size, DMA_FROM_DEVICE);
845 pktlen = RX_DMA_GET_PLEN0(trxd.rxd2);
846 skb->dev = netdev;
847 skb_put(skb, pktlen);
848 if (trxd.rxd4 & RX_DMA_L4_VALID)
849 skb->ip_summed = CHECKSUM_UNNECESSARY;
850 else
851 skb_checksum_none_assert(skb);
852 skb->protocol = eth_type_trans(skb, netdev);
853
854 if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX &&
855 RX_DMA_VID(trxd.rxd3))
856 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
857 RX_DMA_VID(trxd.rxd3));
858 napi_gro_receive(napi, skb);
859
860 ring->data[idx] = new_data;
861 rxd->rxd1 = (unsigned int)dma_addr;
862
863release_desc:
864 rxd->rxd2 = RX_DMA_PLEN0(ring->buf_size);
865
866 ring->calc_idx = idx;
867 /* make sure that all changes to the dma ring are flushed before
868 * we continue
869 */
870 wmb();
871 mtk_w32(eth, ring->calc_idx, MTK_QRX_CRX_IDX0);
872 done++;
873 }
874
875 if (done < budget)
876 mtk_w32(eth, rx_intr, MTK_QMTK_INT_STATUS);
877
878 return done;
879}
880
881static int mtk_poll_tx(struct mtk_eth *eth, int budget, bool *tx_again)
882{
883 struct mtk_tx_ring *ring = &eth->tx_ring;
884 struct mtk_tx_dma *desc;
885 struct sk_buff *skb;
886 struct mtk_tx_buf *tx_buf;
887 int total = 0, done[MTK_MAX_DEVS];
888 unsigned int bytes[MTK_MAX_DEVS];
889 u32 cpu, dma;
890 static int condition;
891 int i;
892
893 memset(done, 0, sizeof(done));
894 memset(bytes, 0, sizeof(bytes));
895
896 cpu = mtk_r32(eth, MTK_QTX_CRX_PTR);
897 dma = mtk_r32(eth, MTK_QTX_DRX_PTR);
898
899 desc = mtk_qdma_phys_to_virt(ring, cpu);
900
901 while ((cpu != dma) && budget) {
902 u32 next_cpu = desc->txd2;
903 int mac;
904
905 desc = mtk_qdma_phys_to_virt(ring, desc->txd2);
906 if ((desc->txd3 & TX_DMA_OWNER_CPU) == 0)
907 break;
908
909 mac = (desc->txd4 >> TX_DMA_FPORT_SHIFT) &
910 TX_DMA_FPORT_MASK;
911 mac--;
912
913 tx_buf = mtk_desc_to_tx_buf(ring, desc);
914 skb = tx_buf->skb;
915 if (!skb) {
916 condition = 1;
917 break;
918 }
919
920 if (skb != (struct sk_buff *)MTK_DMA_DUMMY_DESC) {
921 bytes[mac] += skb->len;
922 done[mac]++;
923 budget--;
924 }
925 mtk_tx_unmap(eth->dev, tx_buf);
926
927 ring->last_free->txd2 = next_cpu;
928 ring->last_free = desc;
929 atomic_inc(&ring->free_count);
930
931 cpu = next_cpu;
932 }
933
934 mtk_w32(eth, cpu, MTK_QTX_CRX_PTR);
935
936 for (i = 0; i < MTK_MAC_COUNT; i++) {
937 if (!eth->netdev[i] || !done[i])
938 continue;
939 netdev_completed_queue(eth->netdev[i], done[i], bytes[i]);
940 total += done[i];
941 }
942
943 /* read hw index again make sure no new tx packet */
944 if (cpu != dma || cpu != mtk_r32(eth, MTK_QTX_DRX_PTR))
945 *tx_again = true;
946 else
947 mtk_w32(eth, MTK_TX_DONE_INT, MTK_QMTK_INT_STATUS);
948
949 if (!total)
950 return 0;
951
13c822f6
JC		 952 if (atomic_read(&ring->free_count) > ring->thresh)
953 mtk_wake_queue(eth);
656e7052
JC		 954
955 return total;
956}
957
958static int mtk_poll(struct napi_struct *napi, int budget)
959{
960 struct mtk_eth *eth = container_of(napi, struct mtk_eth, rx_napi);
961 u32 status, status2, mask, tx_intr, rx_intr, status_intr;
962 int tx_done, rx_done;
963 bool tx_again = false;
964
965 status = mtk_r32(eth, MTK_QMTK_INT_STATUS);
966 status2 = mtk_r32(eth, MTK_INT_STATUS2);
967 tx_intr = MTK_TX_DONE_INT;
968 rx_intr = MTK_RX_DONE_INT;
969 status_intr = (MTK_GDM1_AF | MTK_GDM2_AF);
970 tx_done = 0;
971 rx_done = 0;
972 tx_again = 0;
973
974 if (status & tx_intr)
975 tx_done = mtk_poll_tx(eth, budget, &tx_again);
976
977 if (status & rx_intr)
978 rx_done = mtk_poll_rx(napi, budget, eth, rx_intr);
979
980 if (unlikely(status2 & status_intr)) {
981 mtk_stats_update(eth);
982 mtk_w32(eth, status_intr, MTK_INT_STATUS2);
983 }
984
985 if (unlikely(netif_msg_intr(eth))) {
986 mask = mtk_r32(eth, MTK_QDMA_INT_MASK);
987 netdev_info(eth->netdev[0],
988 "done tx %d, rx %d, intr 0x%08x/0x%x\n",
989 tx_done, rx_done, status, mask);
990 }
991
992 if (tx_again || rx_done == budget)
993 return budget;
994
995 status = mtk_r32(eth, MTK_QMTK_INT_STATUS);
996 if (status & (tx_intr | rx_intr))
997 return budget;
998
999 napi_complete(napi);
1000 mtk_irq_enable(eth, tx_intr | rx_intr);
1001
1002 return rx_done;
1003}
1004
1005static int mtk_tx_alloc(struct mtk_eth *eth)
1006{
1007 struct mtk_tx_ring *ring = &eth->tx_ring;
1008 int i, sz = sizeof(*ring->dma);
1009
1010 ring->buf = kcalloc(MTK_DMA_SIZE, sizeof(*ring->buf),
1011 GFP_KERNEL);
1012 if (!ring->buf)
1013 goto no_tx_mem;
1014
1015 ring->dma = dma_alloc_coherent(eth->dev,
1016 MTK_DMA_SIZE * sz,
1017 &ring->phys,
1018 GFP_ATOMIC | __GFP_ZERO);
1019 if (!ring->dma)
1020 goto no_tx_mem;
1021
1022 memset(ring->dma, 0, MTK_DMA_SIZE * sz);
1023 for (i = 0; i < MTK_DMA_SIZE; i++) {
1024 int next = (i + 1) % MTK_DMA_SIZE;
1025 u32 next_ptr = ring->phys + next * sz;
1026
1027 ring->dma[i].txd2 = next_ptr;
1028 ring->dma[i].txd3 = TX_DMA_LS0 | TX_DMA_OWNER_CPU;
1029 }
1030
1031 atomic_set(&ring->free_count, MTK_DMA_SIZE - 2);
1032 ring->next_free = &ring->dma[0];
1033 ring->last_free = &ring->dma[MTK_DMA_SIZE - 2];
1034 ring->thresh = max((unsigned long)MTK_DMA_SIZE >> 2,
1035 MAX_SKB_FRAGS);
1036
1037 /* make sure that all changes to the dma ring are flushed before we
1038 * continue
1039 */
1040 wmb();
1041
1042 mtk_w32(eth, ring->phys, MTK_QTX_CTX_PTR);
1043 mtk_w32(eth, ring->phys, MTK_QTX_DTX_PTR);
1044 mtk_w32(eth,
1045 ring->phys + ((MTK_DMA_SIZE - 1) * sz),
1046 MTK_QTX_CRX_PTR);
1047 mtk_w32(eth,
1048 ring->phys + ((MTK_DMA_SIZE - 1) * sz),
1049 MTK_QTX_DRX_PTR);
1050
1051 return 0;
1052
1053no_tx_mem:
1054 return -ENOMEM;
1055}
1056
1057static void mtk_tx_clean(struct mtk_eth *eth)
1058{
1059 struct mtk_tx_ring *ring = &eth->tx_ring;
1060 int i;
1061
1062 if (ring->buf) {
1063 for (i = 0; i < MTK_DMA_SIZE; i++)
1064 mtk_tx_unmap(eth->dev, &ring->buf[i]);
1065 kfree(ring->buf);
1066 ring->buf = NULL;
1067 }
1068
1069 if (ring->dma) {
1070 dma_free_coherent(eth->dev,
1071 MTK_DMA_SIZE * sizeof(*ring->dma),
1072 ring->dma,
1073 ring->phys);
1074 ring->dma = NULL;
1075 }
1076}
1077
1078static int mtk_rx_alloc(struct mtk_eth *eth)
1079{
1080 struct mtk_rx_ring *ring = &eth->rx_ring;
1081 int i;
1082
1083 ring->frag_size = mtk_max_frag_size(ETH_DATA_LEN);
1084 ring->buf_size = mtk_max_buf_size(ring->frag_size);
1085 ring->data = kcalloc(MTK_DMA_SIZE, sizeof(*ring->data),
1086 GFP_KERNEL);
1087 if (!ring->data)
1088 return -ENOMEM;
1089
1090 for (i = 0; i < MTK_DMA_SIZE; i++) {
1091 ring->data[i] = netdev_alloc_frag(ring->frag_size);
1092 if (!ring->data[i])
1093 return -ENOMEM;
1094 }
1095
1096 ring->dma = dma_alloc_coherent(eth->dev,
1097 MTK_DMA_SIZE * sizeof(*ring->dma),
1098 &ring->phys,
1099 GFP_ATOMIC | __GFP_ZERO);
1100 if (!ring->dma)
1101 return -ENOMEM;
1102
1103 for (i = 0; i < MTK_DMA_SIZE; i++) {
1104 dma_addr_t dma_addr = dma_map_single(eth->dev,
1105 ring->data[i] + NET_SKB_PAD,
1106 ring->buf_size,
1107 DMA_FROM_DEVICE);
1108 if (unlikely(dma_mapping_error(eth->dev, dma_addr)))
1109 return -ENOMEM;
1110 ring->dma[i].rxd1 = (unsigned int)dma_addr;
1111
1112 ring->dma[i].rxd2 = RX_DMA_PLEN0(ring->buf_size);
1113 }
1114 ring->calc_idx = MTK_DMA_SIZE - 1;
1115 /* make sure that all changes to the dma ring are flushed before we
1116 * continue
1117 */
1118 wmb();
1119
1120 mtk_w32(eth, eth->rx_ring.phys, MTK_QRX_BASE_PTR0);
1121 mtk_w32(eth, MTK_DMA_SIZE, MTK_QRX_MAX_CNT0);
1122 mtk_w32(eth, eth->rx_ring.calc_idx, MTK_QRX_CRX_IDX0);
1123 mtk_w32(eth, MTK_PST_DRX_IDX0, MTK_QDMA_RST_IDX);
1124 mtk_w32(eth, (QDMA_RES_THRES << 8) | QDMA_RES_THRES, MTK_QTX_CFG(0));
1125
1126 return 0;
1127}
1128
1129static void mtk_rx_clean(struct mtk_eth *eth)
1130{
1131 struct mtk_rx_ring *ring = &eth->rx_ring;
1132 int i;
1133
1134 if (ring->data && ring->dma) {
1135 for (i = 0; i < MTK_DMA_SIZE; i++) {
1136 if (!ring->data[i])
1137 continue;
1138 if (!ring->dma[i].rxd1)
1139 continue;
1140 dma_unmap_single(eth->dev,
1141 ring->dma[i].rxd1,
1142 ring->buf_size,
1143 DMA_FROM_DEVICE);
1144 skb_free_frag(ring->data[i]);
1145 }
1146 kfree(ring->data);
1147 ring->data = NULL;
1148 }
1149
1150 if (ring->dma) {
1151 dma_free_coherent(eth->dev,
1152 MTK_DMA_SIZE * sizeof(*ring->dma),
1153 ring->dma,
1154 ring->phys);
1155 ring->dma = NULL;
1156 }
1157}
1158
1159/* wait for DMA to finish whatever it is doing before we start using it again */
1160static int mtk_dma_busy_wait(struct mtk_eth *eth)
1161{
1162 unsigned long t_start = jiffies;
1163
1164 while (1) {
1165 if (!(mtk_r32(eth, MTK_QDMA_GLO_CFG) &
1166 (MTK_RX_DMA_BUSY | MTK_TX_DMA_BUSY)))
1167 return 0;
1168 if (time_after(jiffies, t_start + MTK_DMA_BUSY_TIMEOUT))
1169 break;
1170 }
1171
1172 dev_err(eth->dev, "DMA init timeout\n");
1173 return -1;
1174}
1175
1176static int mtk_dma_init(struct mtk_eth *eth)
1177{
1178 int err;
1179
1180 if (mtk_dma_busy_wait(eth))
1181 return -EBUSY;
1182
1183 /* QDMA needs scratch memory for internal reordering of the
1184 * descriptors
1185 */
1186 err = mtk_init_fq_dma(eth);
1187 if (err)
1188 return err;
1189
1190 err = mtk_tx_alloc(eth);
1191 if (err)
1192 return err;
1193
1194 err = mtk_rx_alloc(eth);
1195 if (err)
1196 return err;
1197
1198 /* Enable random early drop and set drop threshold automatically */
1199 mtk_w32(eth, FC_THRES_DROP_MODE | FC_THRES_DROP_EN | FC_THRES_MIN,
1200 MTK_QDMA_FC_THRES);
1201 mtk_w32(eth, 0x0, MTK_QDMA_HRED2);
1202
1203 return 0;
1204}
1205
1206static void mtk_dma_free(struct mtk_eth *eth)
1207{
1208 int i;
1209
1210 for (i = 0; i < MTK_MAC_COUNT; i++)
1211 if (eth->netdev[i])
1212 netdev_reset_queue(eth->netdev[i]);
1213 mtk_tx_clean(eth);
1214 mtk_rx_clean(eth);
1215 kfree(eth->scratch_head);
1216}
1217
1218static void mtk_tx_timeout(struct net_device *dev)
1219{
1220 struct mtk_mac *mac = netdev_priv(dev);
1221 struct mtk_eth *eth = mac->hw;
1222
1223 eth->netdev[mac->id]->stats.tx_errors++;
1224 netif_err(eth, tx_err, dev,
1225 "transmit timed out\n");
7c78b4ad 1226 schedule_work(&eth->pending_work);
656e7052
JC		 1227}
1228
1229static irqreturn_t mtk_handle_irq(int irq, void *_eth)
1230{
1231 struct mtk_eth *eth = _eth;
1232 u32 status;
1233
1234 status = mtk_r32(eth, MTK_QMTK_INT_STATUS);
1235 if (unlikely(!status))
1236 return IRQ_NONE;
1237
1238 if (likely(status & (MTK_RX_DONE_INT | MTK_TX_DONE_INT))) {
1239 if (likely(napi_schedule_prep(&eth->rx_napi)))
1240 __napi_schedule(&eth->rx_napi);
1241 } else {
1242 mtk_w32(eth, status, MTK_QMTK_INT_STATUS);
1243 }
1244 mtk_irq_disable(eth, (MTK_RX_DONE_INT | MTK_TX_DONE_INT));
1245
1246 return IRQ_HANDLED;
1247}
1248
1249#ifdef CONFIG_NET_POLL_CONTROLLER
1250static void mtk_poll_controller(struct net_device *dev)
1251{
1252 struct mtk_mac *mac = netdev_priv(dev);
1253 struct mtk_eth *eth = mac->hw;
1254 u32 int_mask = MTK_TX_DONE_INT | MTK_RX_DONE_INT;
1255
1256 mtk_irq_disable(eth, int_mask);
1257 mtk_handle_irq(dev->irq, dev);
1258 mtk_irq_enable(eth, int_mask);
1259}
1260#endif
1261
1262static int mtk_start_dma(struct mtk_eth *eth)
1263{
1264 int err;
1265
1266 err = mtk_dma_init(eth);
1267 if (err) {
1268 mtk_dma_free(eth);
1269 return err;
1270 }
1271
1272 mtk_w32(eth,
1273 MTK_TX_WB_DDONE | MTK_RX_DMA_EN | MTK_TX_DMA_EN |
1274 MTK_RX_2B_OFFSET | MTK_DMA_SIZE_16DWORDS |
1275 MTK_RX_BT_32DWORDS,
1276 MTK_QDMA_GLO_CFG);
1277
1278 return 0;
1279}
1280
1281static int mtk_open(struct net_device *dev)
1282{
1283 struct mtk_mac *mac = netdev_priv(dev);
1284 struct mtk_eth *eth = mac->hw;
1285
1286 /* we run 2 netdevs on the same dma ring so we only bring it up once */
1287 if (!atomic_read(&eth->dma_refcnt)) {
1288 int err = mtk_start_dma(eth);
1289
1290 if (err)
1291 return err;
1292
1293 napi_enable(&eth->rx_napi);
1294 mtk_irq_enable(eth, MTK_TX_DONE_INT | MTK_RX_DONE_INT);
1295 }
1296 atomic_inc(&eth->dma_refcnt);
1297
1298 phy_start(mac->phy_dev);
1299 netif_start_queue(dev);
1300
1301 return 0;
1302}
1303
1304static void mtk_stop_dma(struct mtk_eth *eth, u32 glo_cfg)
1305{
1306 unsigned long flags;
1307 u32 val;
1308 int i;
1309
1310 /* stop the dma engine */
1311 spin_lock_irqsave(&eth->page_lock, flags);
1312 val = mtk_r32(eth, glo_cfg);
1313 mtk_w32(eth, val & ~(MTK_TX_WB_DDONE | MTK_RX_DMA_EN | MTK_TX_DMA_EN),
1314 glo_cfg);
1315 spin_unlock_irqrestore(&eth->page_lock, flags);
1316
1317 /* wait for dma stop */
1318 for (i = 0; i < 10; i++) {
1319 val = mtk_r32(eth, glo_cfg);
1320 if (val & (MTK_TX_DMA_BUSY | MTK_RX_DMA_BUSY)) {
1321 msleep(20);
1322 continue;
1323 }
1324 break;
1325 }
1326}
1327
1328static int mtk_stop(struct net_device *dev)
1329{
1330 struct mtk_mac *mac = netdev_priv(dev);
1331 struct mtk_eth *eth = mac->hw;
1332
1333 netif_tx_disable(dev);
1334 phy_stop(mac->phy_dev);
1335
1336 /* only shutdown DMA if this is the last user */
1337 if (!atomic_dec_and_test(&eth->dma_refcnt))
1338 return 0;
1339
1340 mtk_irq_disable(eth, MTK_TX_DONE_INT | MTK_RX_DONE_INT);
1341 napi_disable(&eth->rx_napi);
1342
1343 mtk_stop_dma(eth, MTK_QDMA_GLO_CFG);
1344
1345 mtk_dma_free(eth);
1346
1347 return 0;
1348}
1349
1350static int __init mtk_hw_init(struct mtk_eth *eth)
1351{
1352 int err, i;
1353
1354 /* reset the frame engine */
1355 reset_control_assert(eth->rstc);
1356 usleep_range(10, 20);
1357 reset_control_deassert(eth->rstc);
1358 usleep_range(10, 20);
1359
1360 /* Set GE2 driving and slew rate */
1361 regmap_write(eth->pctl, GPIO_DRV_SEL10, 0xa00);
1362
1363 /* set GE2 TDSEL */
1364 regmap_write(eth->pctl, GPIO_OD33_CTRL8, 0x5);
1365
1366 /* set GE2 TUNE */
1367 regmap_write(eth->pctl, GPIO_BIAS_CTRL, 0x0);
1368
1369 /* GE1, Force 1000M/FD, FC ON */
1370 mtk_w32(eth, MAC_MCR_FIXED_LINK, MTK_MAC_MCR(0));
1371
1372 /* GE2, Force 1000M/FD, FC ON */
1373 mtk_w32(eth, MAC_MCR_FIXED_LINK, MTK_MAC_MCR(1));
1374
1375 /* Enable RX VLan Offloading */
1376 mtk_w32(eth, 1, MTK_CDMP_EG_CTRL);
1377
1378 err = devm_request_irq(eth->dev, eth->irq, mtk_handle_irq, 0,
1379 dev_name(eth->dev), eth);
1380 if (err)
1381 return err;
1382
1383 err = mtk_mdio_init(eth);
1384 if (err)
1385 return err;
1386
1387 /* disable delay and normal interrupt */
1388 mtk_w32(eth, 0, MTK_QDMA_DELAY_INT);
1389 mtk_irq_disable(eth, MTK_TX_DONE_INT | MTK_RX_DONE_INT);
1390 mtk_w32(eth, RST_GL_PSE, MTK_RST_GL);
1391 mtk_w32(eth, 0, MTK_RST_GL);
1392
1393 /* FE int grouping */
1394 mtk_w32(eth, 0, MTK_FE_INT_GRP);
1395
1396 for (i = 0; i < 2; i++) {
1397 u32 val = mtk_r32(eth, MTK_GDMA_FWD_CFG(i));
1398
1399 /* setup the forward port to send frame to QDMA */
1400 val &= ~0xffff;
1401 val |= 0x5555;
1402
1403 /* Enable RX checksum */
1404 val |= MTK_GDMA_ICS_EN | MTK_GDMA_TCS_EN | MTK_GDMA_UCS_EN;
1405
1406 /* setup the mac dma */
1407 mtk_w32(eth, val, MTK_GDMA_FWD_CFG(i));
1408 }
1409
1410 return 0;
1411}
1412
1413static int __init mtk_init(struct net_device *dev)
1414{
1415 struct mtk_mac *mac = netdev_priv(dev);
1416 struct mtk_eth *eth = mac->hw;
1417 const char *mac_addr;
1418
1419 mac_addr = of_get_mac_address(mac->of_node);
1420 if (mac_addr)
1421 ether_addr_copy(dev->dev_addr, mac_addr);
1422
1423 /* If the mac address is invalid, use random mac address */
1424 if (!is_valid_ether_addr(dev->dev_addr)) {
1425 random_ether_addr(dev->dev_addr);
1426 dev_err(eth->dev, "generated random MAC address %pM\n",
1427 dev->dev_addr);
1428 dev->addr_assign_type = NET_ADDR_RANDOM;
1429 }
1430
1431 return mtk_phy_connect(mac);
1432}
1433
1434static void mtk_uninit(struct net_device *dev)
1435{
1436 struct mtk_mac *mac = netdev_priv(dev);
1437 struct mtk_eth *eth = mac->hw;
1438
1439 phy_disconnect(mac->phy_dev);
1440 mtk_mdio_cleanup(eth);
1441 mtk_irq_disable(eth, ~0);
1442 free_irq(dev->irq, dev);
1443}
1444
1445static int mtk_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1446{
1447 struct mtk_mac *mac = netdev_priv(dev);
1448
1449 switch (cmd) {
1450 case SIOCGMIIPHY:
1451 case SIOCGMIIREG:
1452 case SIOCSMIIREG:
1453 return phy_mii_ioctl(mac->phy_dev, ifr, cmd);
1454 default:
1455 break;
1456 }
1457
1458 return -EOPNOTSUPP;
1459}
1460
1461static void mtk_pending_work(struct work_struct *work)
1462{
7c78b4ad 1463 struct mtk_eth *eth = container_of(work, struct mtk_eth, pending_work);
e7d425dc
JC		 1464 int err, i;
1465 unsigned long restart = 0;
656e7052
JC		 1466
1467 rtnl_lock();
656e7052 1468
e7d425dc
JC		 1469 /* stop all devices to make sure that dma is properly shut down */
1470 for (i = 0; i < MTK_MAC_COUNT; i++) {
7c78b4ad 1471 if (!eth->netdev[i])
e7d425dc
JC		 1472 continue;
1473 mtk_stop(eth->netdev[i]);
1474 __set_bit(i, &restart);
1475 }
1476
1477 /* restart DMA and enable IRQs */
1478 for (i = 0; i < MTK_MAC_COUNT; i++) {
1479 if (!test_bit(i, &restart))
1480 continue;
1481 err = mtk_open(eth->netdev[i]);
1482 if (err) {
1483 netif_alert(eth, ifup, eth->netdev[i],
1484 "Driver up/down cycle failed, closing device.\n");
1485 dev_close(eth->netdev[i]);
1486 }
656e7052
JC		 1487 }
1488 rtnl_unlock();
1489}
1490
1491static int mtk_cleanup(struct mtk_eth *eth)
1492{
1493 int i;
1494
1495 for (i = 0; i < MTK_MAC_COUNT; i++) {
656e7052
JC		 1496 if (!eth->netdev[i])
1497 continue;
1498
1499 unregister_netdev(eth->netdev[i]);
1500 free_netdev(eth->netdev[i]);
656e7052 1501 }
7c78b4ad 1502 cancel_work_sync(&eth->pending_work);
656e7052
JC		 1503
1504 return 0;
1505}
1506
1507static int mtk_get_settings(struct net_device *dev,
1508 struct ethtool_cmd *cmd)
1509{
1510 struct mtk_mac *mac = netdev_priv(dev);
1511 int err;
1512
1513 err = phy_read_status(mac->phy_dev);
1514 if (err)
1515 return -ENODEV;
1516
1517 return phy_ethtool_gset(mac->phy_dev, cmd);
1518}
1519
1520static int mtk_set_settings(struct net_device *dev,
1521 struct ethtool_cmd *cmd)
1522{
1523 struct mtk_mac *mac = netdev_priv(dev);
1524
1525 if (cmd->phy_address != mac->phy_dev->mdio.addr) {
1526 mac->phy_dev = mdiobus_get_phy(mac->hw->mii_bus,
1527 cmd->phy_address);
1528 if (!mac->phy_dev)
1529 return -ENODEV;
1530 }
1531
1532 return phy_ethtool_sset(mac->phy_dev, cmd);
1533}
1534
1535static void mtk_get_drvinfo(struct net_device *dev,
1536 struct ethtool_drvinfo *info)
1537{
1538 struct mtk_mac *mac = netdev_priv(dev);
1539
1540 strlcpy(info->driver, mac->hw->dev->driver->name, sizeof(info->driver));
1541 strlcpy(info->bus_info, dev_name(mac->hw->dev), sizeof(info->bus_info));
1542 info->n_stats = ARRAY_SIZE(mtk_ethtool_stats);
1543}
1544
1545static u32 mtk_get_msglevel(struct net_device *dev)
1546{
1547 struct mtk_mac *mac = netdev_priv(dev);
1548
1549 return mac->hw->msg_enable;
1550}
1551
1552static void mtk_set_msglevel(struct net_device *dev, u32 value)
1553{
1554 struct mtk_mac *mac = netdev_priv(dev);
1555
1556 mac->hw->msg_enable = value;
1557}
1558
1559static int mtk_nway_reset(struct net_device *dev)
1560{
1561 struct mtk_mac *mac = netdev_priv(dev);
1562
1563 return genphy_restart_aneg(mac->phy_dev);
1564}
1565
1566static u32 mtk_get_link(struct net_device *dev)
1567{
1568 struct mtk_mac *mac = netdev_priv(dev);
1569 int err;
1570
1571 err = genphy_update_link(mac->phy_dev);
1572 if (err)
1573 return ethtool_op_get_link(dev);
1574
1575 return mac->phy_dev->link;
1576}
1577
1578static void mtk_get_strings(struct net_device *dev, u32 stringset, u8 *data)
1579{
1580 int i;
1581
1582 switch (stringset) {
1583 case ETH_SS_STATS:
1584 for (i = 0; i < ARRAY_SIZE(mtk_ethtool_stats); i++) {
1585 memcpy(data, mtk_ethtool_stats[i].str, ETH_GSTRING_LEN);
1586 data += ETH_GSTRING_LEN;
1587 }
1588 break;
1589 }
1590}
1591
1592static int mtk_get_sset_count(struct net_device *dev, int sset)
1593{
1594 switch (sset) {
1595 case ETH_SS_STATS:
1596 return ARRAY_SIZE(mtk_ethtool_stats);
1597 default:
1598 return -EOPNOTSUPP;
1599 }
1600}
1601
1602static void mtk_get_ethtool_stats(struct net_device *dev,
1603 struct ethtool_stats *stats, u64 *data)
1604{
1605 struct mtk_mac *mac = netdev_priv(dev);
1606 struct mtk_hw_stats *hwstats = mac->hw_stats;
1607 u64 *data_src, *data_dst;
1608 unsigned int start;
1609 int i;
1610
1611 if (netif_running(dev) && netif_device_present(dev)) {
1612 if (spin_trylock(&hwstats->stats_lock)) {
1613 mtk_stats_update_mac(mac);
1614 spin_unlock(&hwstats->stats_lock);
1615 }
1616 }
1617
1618 do {
1619 data_src = (u64*)hwstats;
1620 data_dst = data;
1621 start = u64_stats_fetch_begin_irq(&hwstats->syncp);
1622
1623 for (i = 0; i < ARRAY_SIZE(mtk_ethtool_stats); i++)
1624 *data_dst++ = *(data_src + mtk_ethtool_stats[i].offset);
1625 } while (u64_stats_fetch_retry_irq(&hwstats->syncp, start));
1626}
1627
1628static struct ethtool_ops mtk_ethtool_ops = {
1629 .get_settings = mtk_get_settings,
1630 .set_settings = mtk_set_settings,
1631 .get_drvinfo = mtk_get_drvinfo,
1632 .get_msglevel = mtk_get_msglevel,
1633 .set_msglevel = mtk_set_msglevel,
1634 .nway_reset = mtk_nway_reset,
1635 .get_link = mtk_get_link,
1636 .get_strings = mtk_get_strings,
1637 .get_sset_count = mtk_get_sset_count,
1638 .get_ethtool_stats = mtk_get_ethtool_stats,
1639};
1640
1641static const struct net_device_ops mtk_netdev_ops = {
1642 .ndo_init = mtk_init,
1643 .ndo_uninit = mtk_uninit,
1644 .ndo_open = mtk_open,
1645 .ndo_stop = mtk_stop,
1646 .ndo_start_xmit = mtk_start_xmit,
1647 .ndo_set_mac_address = mtk_set_mac_address,
1648 .ndo_validate_addr = eth_validate_addr,
1649 .ndo_do_ioctl = mtk_do_ioctl,
1650 .ndo_change_mtu = eth_change_mtu,
1651 .ndo_tx_timeout = mtk_tx_timeout,
1652 .ndo_get_stats64 = mtk_get_stats64,
1653#ifdef CONFIG_NET_POLL_CONTROLLER
1654 .ndo_poll_controller = mtk_poll_controller,
1655#endif
1656};
1657
1658static int mtk_add_mac(struct mtk_eth *eth, struct device_node *np)
1659{
1660 struct mtk_mac *mac;
1661 const __be32 *_id = of_get_property(np, "reg", NULL);
1662 int id, err;
1663
1664 if (!_id) {
1665 dev_err(eth->dev, "missing mac id\n");
1666 return -EINVAL;
1667 }
1668
1669 id = be32_to_cpup(_id);
1670 if (id >= MTK_MAC_COUNT) {
1671 dev_err(eth->dev, "%d is not a valid mac id\n", id);
1672 return -EINVAL;
1673 }
1674
1675 if (eth->netdev[id]) {
1676 dev_err(eth->dev, "duplicate mac id found: %d\n", id);
1677 return -EINVAL;
1678 }
1679
1680 eth->netdev[id] = alloc_etherdev(sizeof(*mac));
1681 if (!eth->netdev[id]) {
1682 dev_err(eth->dev, "alloc_etherdev failed\n");
1683 return -ENOMEM;
1684 }
1685 mac = netdev_priv(eth->netdev[id]);
1686 eth->mac[id] = mac;
1687 mac->id = id;
1688 mac->hw = eth;
1689 mac->of_node = np;
656e7052
JC		 1690
1691 mac->hw_stats = devm_kzalloc(eth->dev,
1692 sizeof(*mac->hw_stats),
1693 GFP_KERNEL);
1694 if (!mac->hw_stats) {
1695 dev_err(eth->dev, "failed to allocate counter memory\n");
1696 err = -ENOMEM;
1697 goto free_netdev;
1698 }
1699 spin_lock_init(&mac->hw_stats->stats_lock);
1700 mac->hw_stats->reg_offset = id * MTK_STAT_OFFSET;
1701
1702 SET_NETDEV_DEV(eth->netdev[id], eth->dev);
82500aa0 1703 eth->netdev[id]->watchdog_timeo = HZ;
656e7052
JC		 1704 eth->netdev[id]->netdev_ops = &mtk_netdev_ops;
1705 eth->netdev[id]->base_addr = (unsigned long)eth->base;
1706 eth->netdev[id]->vlan_features = MTK_HW_FEATURES &
1707 ~(NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX);
1708 eth->netdev[id]->features |= MTK_HW_FEATURES;
1709 eth->netdev[id]->ethtool_ops = &mtk_ethtool_ops;
1710
1711 err = register_netdev(eth->netdev[id]);
1712 if (err) {
1713 dev_err(eth->dev, "error bringing up device\n");
1714 goto free_netdev;
1715 }
1716 eth->netdev[id]->irq = eth->irq;
1717 netif_info(eth, probe, eth->netdev[id],
1718 "mediatek frame engine at 0x%08lx, irq %d\n",
1719 eth->netdev[id]->base_addr, eth->netdev[id]->irq);
1720
1721 return 0;
1722
1723free_netdev:
1724 free_netdev(eth->netdev[id]);
1725 return err;
1726}
1727
1728static int mtk_probe(struct platform_device *pdev)
1729{
1730 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1731 struct device_node *mac_np;
1732 const struct of_device_id *match;
1733 struct mtk_soc_data *soc;
1734 struct mtk_eth *eth;
1735 int err;
1736
656e7052
JC		 1737 match = of_match_device(of_mtk_match, &pdev->dev);
1738 soc = (struct mtk_soc_data *)match->data;
1739
1740 eth = devm_kzalloc(&pdev->dev, sizeof(*eth), GFP_KERNEL);
1741 if (!eth)
1742 return -ENOMEM;
1743
1744 eth->base = devm_ioremap_resource(&pdev->dev, res);
621e49f6
VZ		 1745 if (IS_ERR(eth->base))
1746 return PTR_ERR(eth->base);
656e7052
JC		 1747
1748 spin_lock_init(&eth->page_lock);
1749
1750 eth->ethsys = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
1751 "mediatek,ethsys");
1752 if (IS_ERR(eth->ethsys)) {
1753 dev_err(&pdev->dev, "no ethsys regmap found\n");
1754 return PTR_ERR(eth->ethsys);
1755 }
1756
1757 eth->pctl = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
1758 "mediatek,pctl");
1759 if (IS_ERR(eth->pctl)) {
1760 dev_err(&pdev->dev, "no pctl regmap found\n");
1761 return PTR_ERR(eth->pctl);
1762 }
1763
1764 eth->rstc = devm_reset_control_get(&pdev->dev, "eth");
1765 if (IS_ERR(eth->rstc)) {
1766 dev_err(&pdev->dev, "no eth reset found\n");
1767 return PTR_ERR(eth->rstc);
1768 }
1769
1770 eth->irq = platform_get_irq(pdev, 0);
1771 if (eth->irq < 0) {
1772 dev_err(&pdev->dev, "no IRQ resource found\n");
1773 return -ENXIO;
1774 }
1775
1776 eth->clk_ethif = devm_clk_get(&pdev->dev, "ethif");
1777 eth->clk_esw = devm_clk_get(&pdev->dev, "esw");
1778 eth->clk_gp1 = devm_clk_get(&pdev->dev, "gp1");
1779 eth->clk_gp2 = devm_clk_get(&pdev->dev, "gp2");
1780 if (IS_ERR(eth->clk_esw) || IS_ERR(eth->clk_gp1) ||
1781 IS_ERR(eth->clk_gp2) || IS_ERR(eth->clk_ethif))
1782 return -ENODEV;
1783
1784 clk_prepare_enable(eth->clk_ethif);
1785 clk_prepare_enable(eth->clk_esw);
1786 clk_prepare_enable(eth->clk_gp1);
1787 clk_prepare_enable(eth->clk_gp2);
1788
1789 eth->dev = &pdev->dev;
1790 eth->msg_enable = netif_msg_init(mtk_msg_level, MTK_DEFAULT_MSG_ENABLE);
7c78b4ad 1791 INIT_WORK(&eth->pending_work, mtk_pending_work);
656e7052
JC		 1792
1793 err = mtk_hw_init(eth);
1794 if (err)
1795 return err;
1796
1797 for_each_child_of_node(pdev->dev.of_node, mac_np) {
1798 if (!of_device_is_compatible(mac_np,
1799 "mediatek,eth-mac"))
1800 continue;
1801
1802 if (!of_device_is_available(mac_np))
1803 continue;
1804
1805 err = mtk_add_mac(eth, mac_np);
1806 if (err)
1807 goto err_free_dev;
1808 }
1809
1810 /* we run 2 devices on the same DMA ring so we need a dummy device
1811 * for NAPI to work
1812 */
1813 init_dummy_netdev(&eth->dummy_dev);
1814 netif_napi_add(&eth->dummy_dev, &eth->rx_napi, mtk_poll,
1815 MTK_NAPI_WEIGHT);
1816
1817 platform_set_drvdata(pdev, eth);
1818
1819 return 0;
1820
1821err_free_dev:
1822 mtk_cleanup(eth);
1823 return err;
1824}
1825
1826static int mtk_remove(struct platform_device *pdev)
1827{
1828 struct mtk_eth *eth = platform_get_drvdata(pdev);
1829
1830 clk_disable_unprepare(eth->clk_ethif);
1831 clk_disable_unprepare(eth->clk_esw);
1832 clk_disable_unprepare(eth->clk_gp1);
1833 clk_disable_unprepare(eth->clk_gp2);
1834
1835 netif_napi_del(&eth->rx_napi);
1836 mtk_cleanup(eth);
1837 platform_set_drvdata(pdev, NULL);
1838
1839 return 0;
1840}
1841
1842const struct of_device_id of_mtk_match[] = {
1843 { .compatible = "mediatek,mt7623-eth" },
1844 {},
1845};
1846
1847static struct platform_driver mtk_driver = {
1848 .probe = mtk_probe,
1849 .remove = mtk_remove,
1850 .driver = {
1851 .name = "mtk_soc_eth",
1852 .owner = THIS_MODULE,
1853 .of_match_table = of_mtk_match,
1854 },
1855};
1856
1857module_platform_driver(mtk_driver);
1858
1859MODULE_LICENSE("GPL");
1860MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
1861MODULE_DESCRIPTION("Ethernet driver for MediaTek SoC");
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