1 // SPDX-License-Identifier: GPL-2.0-or-later
2 
3 /* Copyright (c) 2014 Linaro Ltd.
4  * Copyright (c) 2014 Hisilicon Limited.
5  */
6 
7 #include <linux/module.h>
8 #include <linux/etherdevice.h>
9 #include <linux/platform_device.h>
10 #include <linux/interrupt.h>
11 #include <linux/ktime.h>
12 #include <linux/of_address.h>
13 #include <linux/phy.h>
14 #include <linux/of_mdio.h>
15 #include <linux/of_net.h>
16 #include <linux/mfd/syscon.h>
17 #include <linux/regmap.h>
18 
19 #define SC_PPE_RESET_DREQ		0x026C
20 
21 #define PPE_CFG_RX_ADDR			0x100
22 #define PPE_CFG_POOL_GRP		0x300
23 #define PPE_CFG_RX_BUF_SIZE		0x400
24 #define PPE_CFG_RX_FIFO_SIZE		0x500
25 #define PPE_CURR_BUF_CNT		0xa200
26 
27 #define GE_DUPLEX_TYPE			0x08
28 #define GE_MAX_FRM_SIZE_REG		0x3c
29 #define GE_PORT_MODE			0x40
30 #define GE_PORT_EN			0x44
31 #define GE_SHORT_RUNTS_THR_REG		0x50
32 #define GE_TX_LOCAL_PAGE_REG		0x5c
33 #define GE_TRANSMIT_CONTROL_REG		0x60
34 #define GE_CF_CRC_STRIP_REG		0x1b0
35 #define GE_MODE_CHANGE_REG		0x1b4
36 #define GE_RECV_CONTROL_REG		0x1e0
37 #define GE_STATION_MAC_ADDRESS		0x210
38 
39 #define PPE_CFG_BUS_CTRL_REG		0x424
40 #define PPE_CFG_RX_CTRL_REG		0x428
41 
42 #if defined(CONFIG_HI13X1_GMAC)
43 #define PPE_CFG_CPU_ADD_ADDR		0x6D0
44 #define PPE_CFG_MAX_FRAME_LEN_REG	0x500
45 #define PPE_CFG_RX_PKT_MODE_REG		0x504
46 #define PPE_CFG_QOS_VMID_GEN		0x520
47 #define PPE_CFG_RX_PKT_INT		0x740
48 #define PPE_INTEN			0x700
49 #define PPE_INTSTS			0x708
50 #define PPE_RINT			0x704
51 #define PPE_CFG_STS_MODE		0x880
52 #else
53 #define PPE_CFG_CPU_ADD_ADDR		0x580
54 #define PPE_CFG_MAX_FRAME_LEN_REG	0x408
55 #define PPE_CFG_RX_PKT_MODE_REG		0x438
56 #define PPE_CFG_QOS_VMID_GEN		0x500
57 #define PPE_CFG_RX_PKT_INT		0x538
58 #define PPE_INTEN			0x600
59 #define PPE_INTSTS			0x608
60 #define PPE_RINT			0x604
61 #define PPE_CFG_STS_MODE		0x700
62 #endif /* CONFIG_HI13X1_GMAC */
63 
64 #define PPE_HIS_RX_PKT_CNT		0x804
65 
66 #define RESET_DREQ_ALL			0xffffffff
67 
68 /* REG_INTERRUPT */
69 #define RCV_INT				BIT(10)
70 #define RCV_NOBUF			BIT(8)
71 #define RCV_DROP			BIT(7)
72 #define TX_DROP				BIT(6)
73 #define DEF_INT_ERR			(RCV_NOBUF | RCV_DROP | TX_DROP)
74 #define DEF_INT_MASK			(RCV_INT | DEF_INT_ERR)
75 
76 /* TX descriptor config */
77 #define TX_FREE_MEM			BIT(0)
78 #define TX_READ_ALLOC_L3		BIT(1)
79 #if defined(CONFIG_HI13X1_GMAC)
80 #define TX_CLEAR_WB			BIT(7)
81 #define TX_RELEASE_TO_PPE		BIT(4)
82 #define TX_FINISH_CACHE_INV		BIT(6)
83 #define TX_POOL_SHIFT			16
84 #else
85 #define TX_CLEAR_WB			BIT(4)
86 #define TX_FINISH_CACHE_INV		BIT(2)
87 #endif
88 #define TX_L3_CHECKSUM			BIT(5)
89 #define TX_LOOP_BACK			BIT(11)
90 
91 /* RX error */
92 #define RX_PKT_DROP			BIT(0)
93 #define RX_L2_ERR			BIT(1)
94 #define RX_PKT_ERR			(RX_PKT_DROP | RX_L2_ERR)
95 
96 #define SGMII_SPEED_1000		0x08
97 #define SGMII_SPEED_100			0x07
98 #define SGMII_SPEED_10			0x06
99 #define MII_SPEED_100			0x01
100 #define MII_SPEED_10			0x00
101 
102 #define GE_DUPLEX_FULL			BIT(0)
103 #define GE_DUPLEX_HALF			0x00
104 #define GE_MODE_CHANGE_EN		BIT(0)
105 
106 #define GE_TX_AUTO_NEG			BIT(5)
107 #define GE_TX_ADD_CRC			BIT(6)
108 #define GE_TX_SHORT_PAD_THROUGH		BIT(7)
109 
110 #define GE_RX_STRIP_CRC			BIT(0)
111 #define GE_RX_STRIP_PAD			BIT(3)
112 #define GE_RX_PAD_EN			BIT(4)
113 
114 #define GE_AUTO_NEG_CTL			BIT(0)
115 
116 #define GE_RX_INT_THRESHOLD		BIT(6)
117 #define GE_RX_TIMEOUT			0x04
118 
119 #define GE_RX_PORT_EN			BIT(1)
120 #define GE_TX_PORT_EN			BIT(2)
121 
122 #define PPE_CFG_RX_PKT_ALIGN		BIT(18)
123 
124 #if defined(CONFIG_HI13X1_GMAC)
125 #define PPE_CFG_QOS_VMID_GRP_SHIFT	4
126 #define PPE_CFG_RX_CTRL_ALIGN_SHIFT	7
127 #define PPE_CFG_STS_RX_PKT_CNT_RC	BIT(0)
128 #define PPE_CFG_QOS_VMID_MODE		BIT(15)
129 #define PPE_CFG_BUS_LOCAL_REL		(BIT(9) | BIT(15) | BIT(19) | BIT(23))
130 
131 /* buf unit size is cache_line_size, which is 64, so the shift is 6 */
132 #define PPE_BUF_SIZE_SHIFT		6
133 #define PPE_TX_BUF_HOLD			BIT(31)
134 #define SOC_CACHE_LINE_MASK		0x3F
135 #else
136 #define PPE_CFG_QOS_VMID_GRP_SHIFT	8
137 #define PPE_CFG_RX_CTRL_ALIGN_SHIFT	11
138 #define PPE_CFG_STS_RX_PKT_CNT_RC	BIT(12)
139 #define PPE_CFG_QOS_VMID_MODE		BIT(14)
140 #define PPE_CFG_BUS_LOCAL_REL		BIT(14)
141 
142 /* buf unit size is 1, so the shift is 6 */
143 #define PPE_BUF_SIZE_SHIFT		0
144 #define PPE_TX_BUF_HOLD			0
145 #endif /* CONFIG_HI13X1_GMAC */
146 
147 #define PPE_CFG_RX_FIFO_FSFU		BIT(11)
148 #define PPE_CFG_RX_DEPTH_SHIFT		16
149 #define PPE_CFG_RX_START_SHIFT		0
150 
151 #define PPE_CFG_BUS_BIG_ENDIEN		BIT(0)
152 
153 #define RX_DESC_NUM			128
154 #define TX_DESC_NUM			256
155 #define TX_NEXT(N)			(((N) + 1) & (TX_DESC_NUM-1))
156 #define RX_NEXT(N)			(((N) + 1) & (RX_DESC_NUM-1))
157 
158 #define GMAC_PPE_RX_PKT_MAX_LEN		379
159 #define GMAC_MAX_PKT_LEN		1516
160 #define GMAC_MIN_PKT_LEN		31
161 #define RX_BUF_SIZE			1600
162 #define RESET_TIMEOUT			1000
163 #define TX_TIMEOUT			(6 * HZ)
164 
165 #define DRV_NAME			"hip04-ether"
166 #define DRV_VERSION			"v1.0"
167 
168 #define HIP04_MAX_TX_COALESCE_USECS	200
169 #define HIP04_MIN_TX_COALESCE_USECS	100
170 #define HIP04_MAX_TX_COALESCE_FRAMES	200
171 #define HIP04_MIN_TX_COALESCE_FRAMES	100
172 
173 struct tx_desc {
174 #if defined(CONFIG_HI13X1_GMAC)
175 	u32 reserved1[2];
176 	u32 send_addr;
177 	u16 send_size;
178 	u16 data_offset;
179 	u32 reserved2[7];
180 	u32 cfg;
181 	u32 wb_addr;
182 	u32 reserved3[3];
183 #else
184 	u32 send_addr;
185 	u32 send_size;
186 	u32 next_addr;
187 	u32 cfg;
188 	u32 wb_addr;
189 #endif
190 } __aligned(64);
191 
192 struct rx_desc {
193 #if defined(CONFIG_HI13X1_GMAC)
194 	u32 reserved1[3];
195 	u16 pkt_len;
196 	u16 reserved_16;
197 	u32 reserved2[6];
198 	u32 pkt_err;
199 	u32 reserved3[5];
200 #else
201 	u16 reserved_16;
202 	u16 pkt_len;
203 	u32 reserve1[3];
204 	u32 pkt_err;
205 	u32 reserve2[4];
206 #endif
207 };
208 
209 struct hip04_priv {
210 	void __iomem *base;
211 #if defined(CONFIG_HI13X1_GMAC)
212 	void __iomem *sysctrl_base;
213 #endif
214 	phy_interface_t phy_mode;
215 	int chan;
216 	unsigned int port;
217 	unsigned int group;
218 	unsigned int speed;
219 	unsigned int duplex;
220 	unsigned int reg_inten;
221 
222 	struct napi_struct napi;
223 	struct device *dev;
224 	struct net_device *ndev;
225 
226 	struct tx_desc *tx_desc;
227 	dma_addr_t tx_desc_dma;
228 	struct sk_buff *tx_skb[TX_DESC_NUM];
229 	dma_addr_t tx_phys[TX_DESC_NUM];
230 	unsigned int tx_head;
231 
232 	int tx_coalesce_frames;
233 	int tx_coalesce_usecs;
234 	struct hrtimer tx_coalesce_timer;
235 
236 	unsigned char *rx_buf[RX_DESC_NUM];
237 	dma_addr_t rx_phys[RX_DESC_NUM];
238 	unsigned int rx_head;
239 	unsigned int rx_buf_size;
240 	unsigned int rx_cnt_remaining;
241 
242 	struct device_node *phy_node;
243 	struct phy_device *phy;
244 	struct regmap *map;
245 	struct work_struct tx_timeout_task;
246 
247 	/* written only by tx cleanup */
248 	unsigned int tx_tail ____cacheline_aligned_in_smp;
249 };
250 
251 static inline unsigned int tx_count(unsigned int head, unsigned int tail)
252 {
253 	return (head - tail) % TX_DESC_NUM;
254 }
255 
256 static void hip04_config_port(struct net_device *ndev, u32 speed, u32 duplex)
257 {
258 	struct hip04_priv *priv = netdev_priv(ndev);
259 	u32 val;
260 
261 	priv->speed = speed;
262 	priv->duplex = duplex;
263 
264 	switch (priv->phy_mode) {
265 	case PHY_INTERFACE_MODE_SGMII:
266 		if (speed == SPEED_1000)
267 			val = SGMII_SPEED_1000;
268 		else if (speed == SPEED_100)
269 			val = SGMII_SPEED_100;
270 		else
271 			val = SGMII_SPEED_10;
272 		break;
273 	case PHY_INTERFACE_MODE_MII:
274 		if (speed == SPEED_100)
275 			val = MII_SPEED_100;
276 		else
277 			val = MII_SPEED_10;
278 		break;
279 	default:
280 		netdev_warn(ndev, "not supported mode\n");
281 		val = MII_SPEED_10;
282 		break;
283 	}
284 	writel_relaxed(val, priv->base + GE_PORT_MODE);
285 
286 	val = duplex ? GE_DUPLEX_FULL : GE_DUPLEX_HALF;
287 	writel_relaxed(val, priv->base + GE_DUPLEX_TYPE);
288 
289 	val = GE_MODE_CHANGE_EN;
290 	writel_relaxed(val, priv->base + GE_MODE_CHANGE_REG);
291 }
292 
293 static void hip04_reset_dreq(struct hip04_priv *priv)
294 {
295 #if defined(CONFIG_HI13X1_GMAC)
296 	writel_relaxed(RESET_DREQ_ALL, priv->sysctrl_base + SC_PPE_RESET_DREQ);
297 #endif
298 }
299 
300 static void hip04_reset_ppe(struct hip04_priv *priv)
301 {
302 	u32 val, tmp, timeout = 0;
303 
304 	do {
305 		regmap_read(priv->map, priv->port * 4 + PPE_CURR_BUF_CNT, &val);
306 		regmap_read(priv->map, priv->port * 4 + PPE_CFG_RX_ADDR, &tmp);
307 		if (timeout++ > RESET_TIMEOUT)
308 			break;
309 	} while (val & 0xfff);
310 }
311 
312 static void hip04_config_fifo(struct hip04_priv *priv)
313 {
314 	u32 val;
315 
316 	val = readl_relaxed(priv->base + PPE_CFG_STS_MODE);
317 	val |= PPE_CFG_STS_RX_PKT_CNT_RC;
318 	writel_relaxed(val, priv->base + PPE_CFG_STS_MODE);
319 
320 	val = BIT(priv->group);
321 	regmap_write(priv->map, priv->port * 4 + PPE_CFG_POOL_GRP, val);
322 
323 	val = priv->group << PPE_CFG_QOS_VMID_GRP_SHIFT;
324 	val |= PPE_CFG_QOS_VMID_MODE;
325 	writel_relaxed(val, priv->base + PPE_CFG_QOS_VMID_GEN);
326 
327 	val = RX_BUF_SIZE >> PPE_BUF_SIZE_SHIFT;
328 	regmap_write(priv->map, priv->port * 4 + PPE_CFG_RX_BUF_SIZE, val);
329 
330 	val = RX_DESC_NUM << PPE_CFG_RX_DEPTH_SHIFT;
331 	val |= PPE_CFG_RX_FIFO_FSFU;
332 	val |= priv->chan << PPE_CFG_RX_START_SHIFT;
333 	regmap_write(priv->map, priv->port * 4 + PPE_CFG_RX_FIFO_SIZE, val);
334 
335 	val = NET_IP_ALIGN << PPE_CFG_RX_CTRL_ALIGN_SHIFT;
336 	writel_relaxed(val, priv->base + PPE_CFG_RX_CTRL_REG);
337 
338 	val = PPE_CFG_RX_PKT_ALIGN;
339 	writel_relaxed(val, priv->base + PPE_CFG_RX_PKT_MODE_REG);
340 
341 	val = PPE_CFG_BUS_LOCAL_REL | PPE_CFG_BUS_BIG_ENDIEN;
342 	writel_relaxed(val, priv->base + PPE_CFG_BUS_CTRL_REG);
343 
344 	val = GMAC_PPE_RX_PKT_MAX_LEN;
345 	writel_relaxed(val, priv->base + PPE_CFG_MAX_FRAME_LEN_REG);
346 
347 	val = GMAC_MAX_PKT_LEN;
348 	writel_relaxed(val, priv->base + GE_MAX_FRM_SIZE_REG);
349 
350 	val = GMAC_MIN_PKT_LEN;
351 	writel_relaxed(val, priv->base + GE_SHORT_RUNTS_THR_REG);
352 
353 	val = readl_relaxed(priv->base + GE_TRANSMIT_CONTROL_REG);
354 	val |= GE_TX_AUTO_NEG | GE_TX_ADD_CRC | GE_TX_SHORT_PAD_THROUGH;
355 	writel_relaxed(val, priv->base + GE_TRANSMIT_CONTROL_REG);
356 
357 	val = GE_RX_STRIP_CRC;
358 	writel_relaxed(val, priv->base + GE_CF_CRC_STRIP_REG);
359 
360 	val = readl_relaxed(priv->base + GE_RECV_CONTROL_REG);
361 	val |= GE_RX_STRIP_PAD | GE_RX_PAD_EN;
362 	writel_relaxed(val, priv->base + GE_RECV_CONTROL_REG);
363 
364 #ifndef CONFIG_HI13X1_GMAC
365 	val = GE_AUTO_NEG_CTL;
366 	writel_relaxed(val, priv->base + GE_TX_LOCAL_PAGE_REG);
367 #endif
368 }
369 
370 static void hip04_mac_enable(struct net_device *ndev)
371 {
372 	struct hip04_priv *priv = netdev_priv(ndev);
373 	u32 val;
374 
375 	/* enable tx & rx */
376 	val = readl_relaxed(priv->base + GE_PORT_EN);
377 	val |= GE_RX_PORT_EN | GE_TX_PORT_EN;
378 	writel_relaxed(val, priv->base + GE_PORT_EN);
379 
380 	/* clear rx int */
381 	val = RCV_INT;
382 	writel_relaxed(val, priv->base + PPE_RINT);
383 
384 	/* config recv int */
385 	val = GE_RX_INT_THRESHOLD | GE_RX_TIMEOUT;
386 	writel_relaxed(val, priv->base + PPE_CFG_RX_PKT_INT);
387 
388 	/* enable interrupt */
389 	priv->reg_inten = DEF_INT_MASK;
390 	writel_relaxed(priv->reg_inten, priv->base + PPE_INTEN);
391 }
392 
393 static void hip04_mac_disable(struct net_device *ndev)
394 {
395 	struct hip04_priv *priv = netdev_priv(ndev);
396 	u32 val;
397 
398 	/* disable int */
399 	priv->reg_inten &= ~(DEF_INT_MASK);
400 	writel_relaxed(priv->reg_inten, priv->base + PPE_INTEN);
401 
402 	/* disable tx & rx */
403 	val = readl_relaxed(priv->base + GE_PORT_EN);
404 	val &= ~(GE_RX_PORT_EN | GE_TX_PORT_EN);
405 	writel_relaxed(val, priv->base + GE_PORT_EN);
406 }
407 
408 static void hip04_set_xmit_desc(struct hip04_priv *priv, dma_addr_t phys)
409 {
410 	u32 val;
411 
412 	val = phys >> PPE_BUF_SIZE_SHIFT | PPE_TX_BUF_HOLD;
413 	writel(val, priv->base + PPE_CFG_CPU_ADD_ADDR);
414 }
415 
416 static void hip04_set_recv_desc(struct hip04_priv *priv, dma_addr_t phys)
417 {
418 	u32 val;
419 
420 	val = phys >> PPE_BUF_SIZE_SHIFT;
421 	regmap_write(priv->map, priv->port * 4 + PPE_CFG_RX_ADDR, val);
422 }
423 
424 static u32 hip04_recv_cnt(struct hip04_priv *priv)
425 {
426 	return readl(priv->base + PPE_HIS_RX_PKT_CNT);
427 }
428 
429 static void hip04_update_mac_address(struct net_device *ndev)
430 {
431 	struct hip04_priv *priv = netdev_priv(ndev);
432 
433 	writel_relaxed(((ndev->dev_addr[0] << 8) | (ndev->dev_addr[1])),
434 		       priv->base + GE_STATION_MAC_ADDRESS);
435 	writel_relaxed(((ndev->dev_addr[2] << 24) | (ndev->dev_addr[3] << 16) |
436 			(ndev->dev_addr[4] << 8) | (ndev->dev_addr[5])),
437 		       priv->base + GE_STATION_MAC_ADDRESS + 4);
438 }
439 
440 static int hip04_set_mac_address(struct net_device *ndev, void *addr)
441 {
442 	eth_mac_addr(ndev, addr);
443 	hip04_update_mac_address(ndev);
444 	return 0;
445 }
446 
447 static int hip04_tx_reclaim(struct net_device *ndev, bool force)
448 {
449 	struct hip04_priv *priv = netdev_priv(ndev);
450 	unsigned tx_tail = priv->tx_tail;
451 	struct tx_desc *desc;
452 	unsigned int bytes_compl = 0, pkts_compl = 0;
453 	unsigned int count;
454 
455 	smp_rmb();
456 	count = tx_count(READ_ONCE(priv->tx_head), tx_tail);
457 	if (count == 0)
458 		goto out;
459 
460 	while (count) {
461 		desc = &priv->tx_desc[tx_tail];
462 		if (desc->send_addr != 0) {
463 			if (force)
464 				desc->send_addr = 0;
465 			else
466 				break;
467 		}
468 
469 		if (priv->tx_phys[tx_tail]) {
470 			dma_unmap_single(priv->dev, priv->tx_phys[tx_tail],
471 					 priv->tx_skb[tx_tail]->len,
472 					 DMA_TO_DEVICE);
473 			priv->tx_phys[tx_tail] = 0;
474 		}
475 		pkts_compl++;
476 		bytes_compl += priv->tx_skb[tx_tail]->len;
477 		dev_kfree_skb(priv->tx_skb[tx_tail]);
478 		priv->tx_skb[tx_tail] = NULL;
479 		tx_tail = TX_NEXT(tx_tail);
480 		count--;
481 	}
482 
483 	priv->tx_tail = tx_tail;
484 	smp_wmb(); /* Ensure tx_tail visible to xmit */
485 
486 out:
487 	if (pkts_compl || bytes_compl)
488 		netdev_completed_queue(ndev, pkts_compl, bytes_compl);
489 
490 	if (unlikely(netif_queue_stopped(ndev)) && (count < (TX_DESC_NUM - 1)))
491 		netif_wake_queue(ndev);
492 
493 	return count;
494 }
495 
496 static void hip04_start_tx_timer(struct hip04_priv *priv)
497 {
498 	unsigned long ns = priv->tx_coalesce_usecs * NSEC_PER_USEC / 2;
499 
500 	/* allow timer to fire after half the time at the earliest */
501 	hrtimer_start_range_ns(&priv->tx_coalesce_timer, ns_to_ktime(ns),
502 			       ns, HRTIMER_MODE_REL);
503 }
504 
505 static netdev_tx_t
506 hip04_mac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
507 {
508 	struct hip04_priv *priv = netdev_priv(ndev);
509 	struct net_device_stats *stats = &ndev->stats;
510 	unsigned int tx_head = priv->tx_head, count;
511 	struct tx_desc *desc = &priv->tx_desc[tx_head];
512 	dma_addr_t phys;
513 
514 	smp_rmb();
515 	count = tx_count(tx_head, READ_ONCE(priv->tx_tail));
516 	if (count == (TX_DESC_NUM - 1)) {
517 		netif_stop_queue(ndev);
518 		return NETDEV_TX_BUSY;
519 	}
520 
521 	phys = dma_map_single(priv->dev, skb->data, skb->len, DMA_TO_DEVICE);
522 	if (dma_mapping_error(priv->dev, phys)) {
523 		dev_kfree_skb(skb);
524 		return NETDEV_TX_OK;
525 	}
526 
527 	priv->tx_skb[tx_head] = skb;
528 	priv->tx_phys[tx_head] = phys;
529 
530 	desc->send_size = (__force u32)cpu_to_be32(skb->len);
531 #if defined(CONFIG_HI13X1_GMAC)
532 	desc->cfg = (__force u32)cpu_to_be32(TX_CLEAR_WB | TX_FINISH_CACHE_INV
533 		| TX_RELEASE_TO_PPE | priv->port << TX_POOL_SHIFT);
534 	desc->data_offset = (__force u32)cpu_to_be32(phys & SOC_CACHE_LINE_MASK);
535 	desc->send_addr =  (__force u32)cpu_to_be32(phys & ~SOC_CACHE_LINE_MASK);
536 #else
537 	desc->cfg = (__force u32)cpu_to_be32(TX_CLEAR_WB | TX_FINISH_CACHE_INV);
538 	desc->send_addr = (__force u32)cpu_to_be32(phys);
539 #endif
540 	phys = priv->tx_desc_dma + tx_head * sizeof(struct tx_desc);
541 	desc->wb_addr = (__force u32)cpu_to_be32(phys +
542 		offsetof(struct tx_desc, send_addr));
543 	skb_tx_timestamp(skb);
544 
545 	hip04_set_xmit_desc(priv, phys);
546 	count++;
547 	netdev_sent_queue(ndev, skb->len);
548 	priv->tx_head = TX_NEXT(tx_head);
549 
550 	stats->tx_bytes += skb->len;
551 	stats->tx_packets++;
552 
553 	/* Ensure tx_head update visible to tx reclaim */
554 	smp_wmb();
555 
556 	/* queue is getting full, better start cleaning up now */
557 	if (count >= priv->tx_coalesce_frames) {
558 		if (napi_schedule_prep(&priv->napi)) {
559 			/* disable rx interrupt and timer */
560 			priv->reg_inten &= ~(RCV_INT);
561 			writel_relaxed(DEF_INT_MASK & ~RCV_INT,
562 				       priv->base + PPE_INTEN);
563 			hrtimer_cancel(&priv->tx_coalesce_timer);
564 			__napi_schedule(&priv->napi);
565 		}
566 	} else if (!hrtimer_is_queued(&priv->tx_coalesce_timer)) {
567 		/* cleanup not pending yet, start a new timer */
568 		hip04_start_tx_timer(priv);
569 	}
570 
571 	return NETDEV_TX_OK;
572 }
573 
574 static int hip04_rx_poll(struct napi_struct *napi, int budget)
575 {
576 	struct hip04_priv *priv = container_of(napi, struct hip04_priv, napi);
577 	struct net_device *ndev = priv->ndev;
578 	struct net_device_stats *stats = &ndev->stats;
579 	struct rx_desc *desc;
580 	struct sk_buff *skb;
581 	unsigned char *buf;
582 	bool last = false;
583 	dma_addr_t phys;
584 	int rx = 0;
585 	int tx_remaining;
586 	u16 len;
587 	u32 err;
588 
589 	/* clean up tx descriptors */
590 	tx_remaining = hip04_tx_reclaim(ndev, false);
591 	priv->rx_cnt_remaining += hip04_recv_cnt(priv);
592 	while (priv->rx_cnt_remaining && !last) {
593 		buf = priv->rx_buf[priv->rx_head];
594 		skb = build_skb(buf, priv->rx_buf_size);
595 		if (unlikely(!skb)) {
596 			net_dbg_ratelimited("build_skb failed\n");
597 			goto refill;
598 		}
599 
600 		dma_unmap_single(priv->dev, priv->rx_phys[priv->rx_head],
601 				 RX_BUF_SIZE, DMA_FROM_DEVICE);
602 		priv->rx_phys[priv->rx_head] = 0;
603 
604 		desc = (struct rx_desc *)skb->data;
605 		len = be16_to_cpu((__force __be16)desc->pkt_len);
606 		err = be32_to_cpu((__force __be32)desc->pkt_err);
607 
608 		if (0 == len) {
609 			dev_kfree_skb_any(skb);
610 			last = true;
611 		} else if ((err & RX_PKT_ERR) || (len >= GMAC_MAX_PKT_LEN)) {
612 			dev_kfree_skb_any(skb);
613 			stats->rx_dropped++;
614 			stats->rx_errors++;
615 		} else {
616 			skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
617 			skb_put(skb, len);
618 			skb->protocol = eth_type_trans(skb, ndev);
619 			napi_gro_receive(&priv->napi, skb);
620 			stats->rx_packets++;
621 			stats->rx_bytes += len;
622 			rx++;
623 		}
624 
625 refill:
626 		buf = netdev_alloc_frag(priv->rx_buf_size);
627 		if (!buf)
628 			goto done;
629 		phys = dma_map_single(priv->dev, buf,
630 				      RX_BUF_SIZE, DMA_FROM_DEVICE);
631 		if (dma_mapping_error(priv->dev, phys))
632 			goto done;
633 		priv->rx_buf[priv->rx_head] = buf;
634 		priv->rx_phys[priv->rx_head] = phys;
635 		hip04_set_recv_desc(priv, phys);
636 
637 		priv->rx_head = RX_NEXT(priv->rx_head);
638 		if (rx >= budget) {
639 			--priv->rx_cnt_remaining;
640 			goto done;
641 		}
642 
643 		if (--priv->rx_cnt_remaining == 0)
644 			priv->rx_cnt_remaining += hip04_recv_cnt(priv);
645 	}
646 
647 	if (!(priv->reg_inten & RCV_INT)) {
648 		/* enable rx interrupt */
649 		priv->reg_inten |= RCV_INT;
650 		writel_relaxed(priv->reg_inten, priv->base + PPE_INTEN);
651 	}
652 	napi_complete_done(napi, rx);
653 done:
654 	/* start a new timer if necessary */
655 	if (rx < budget && tx_remaining)
656 		hip04_start_tx_timer(priv);
657 
658 	return rx;
659 }
660 
661 static irqreturn_t hip04_mac_interrupt(int irq, void *dev_id)
662 {
663 	struct net_device *ndev = (struct net_device *)dev_id;
664 	struct hip04_priv *priv = netdev_priv(ndev);
665 	struct net_device_stats *stats = &ndev->stats;
666 	u32 ists = readl_relaxed(priv->base + PPE_INTSTS);
667 
668 	if (!ists)
669 		return IRQ_NONE;
670 
671 	writel_relaxed(DEF_INT_MASK, priv->base + PPE_RINT);
672 
673 	if (unlikely(ists & DEF_INT_ERR)) {
674 		if (ists & (RCV_NOBUF | RCV_DROP)) {
675 			stats->rx_errors++;
676 			stats->rx_dropped++;
677 			netdev_err(ndev, "rx drop\n");
678 		}
679 		if (ists & TX_DROP) {
680 			stats->tx_dropped++;
681 			netdev_err(ndev, "tx drop\n");
682 		}
683 	}
684 
685 	if (ists & RCV_INT && napi_schedule_prep(&priv->napi)) {
686 		/* disable rx interrupt */
687 		priv->reg_inten &= ~(RCV_INT);
688 		writel_relaxed(DEF_INT_MASK & ~RCV_INT, priv->base + PPE_INTEN);
689 		hrtimer_cancel(&priv->tx_coalesce_timer);
690 		__napi_schedule(&priv->napi);
691 	}
692 
693 	return IRQ_HANDLED;
694 }
695 
696 static enum hrtimer_restart tx_done(struct hrtimer *hrtimer)
697 {
698 	struct hip04_priv *priv;
699 
700 	priv = container_of(hrtimer, struct hip04_priv, tx_coalesce_timer);
701 
702 	if (napi_schedule_prep(&priv->napi)) {
703 		/* disable rx interrupt */
704 		priv->reg_inten &= ~(RCV_INT);
705 		writel_relaxed(DEF_INT_MASK & ~RCV_INT, priv->base + PPE_INTEN);
706 		__napi_schedule(&priv->napi);
707 	}
708 
709 	return HRTIMER_NORESTART;
710 }
711 
712 static void hip04_adjust_link(struct net_device *ndev)
713 {
714 	struct hip04_priv *priv = netdev_priv(ndev);
715 	struct phy_device *phy = priv->phy;
716 
717 	if ((priv->speed != phy->speed) || (priv->duplex != phy->duplex)) {
718 		hip04_config_port(ndev, phy->speed, phy->duplex);
719 		phy_print_status(phy);
720 	}
721 }
722 
723 static int hip04_mac_open(struct net_device *ndev)
724 {
725 	struct hip04_priv *priv = netdev_priv(ndev);
726 	int i;
727 
728 	priv->rx_head = 0;
729 	priv->rx_cnt_remaining = 0;
730 	priv->tx_head = 0;
731 	priv->tx_tail = 0;
732 	hip04_reset_ppe(priv);
733 
734 	for (i = 0; i < RX_DESC_NUM; i++) {
735 		dma_addr_t phys;
736 
737 		phys = dma_map_single(priv->dev, priv->rx_buf[i],
738 				      RX_BUF_SIZE, DMA_FROM_DEVICE);
739 		if (dma_mapping_error(priv->dev, phys))
740 			return -EIO;
741 
742 		priv->rx_phys[i] = phys;
743 		hip04_set_recv_desc(priv, phys);
744 	}
745 
746 	if (priv->phy)
747 		phy_start(priv->phy);
748 
749 	netdev_reset_queue(ndev);
750 	netif_start_queue(ndev);
751 	hip04_mac_enable(ndev);
752 	napi_enable(&priv->napi);
753 
754 	return 0;
755 }
756 
757 static int hip04_mac_stop(struct net_device *ndev)
758 {
759 	struct hip04_priv *priv = netdev_priv(ndev);
760 	int i;
761 
762 	napi_disable(&priv->napi);
763 	netif_stop_queue(ndev);
764 	hip04_mac_disable(ndev);
765 	hip04_tx_reclaim(ndev, true);
766 	hip04_reset_ppe(priv);
767 
768 	if (priv->phy)
769 		phy_stop(priv->phy);
770 
771 	for (i = 0; i < RX_DESC_NUM; i++) {
772 		if (priv->rx_phys[i]) {
773 			dma_unmap_single(priv->dev, priv->rx_phys[i],
774 					 RX_BUF_SIZE, DMA_FROM_DEVICE);
775 			priv->rx_phys[i] = 0;
776 		}
777 	}
778 
779 	return 0;
780 }
781 
782 static void hip04_timeout(struct net_device *ndev, unsigned int txqueue)
783 {
784 	struct hip04_priv *priv = netdev_priv(ndev);
785 
786 	schedule_work(&priv->tx_timeout_task);
787 }
788 
789 static void hip04_tx_timeout_task(struct work_struct *work)
790 {
791 	struct hip04_priv *priv;
792 
793 	priv = container_of(work, struct hip04_priv, tx_timeout_task);
794 	hip04_mac_stop(priv->ndev);
795 	hip04_mac_open(priv->ndev);
796 }
797 
798 static int hip04_get_coalesce(struct net_device *netdev,
799 			      struct ethtool_coalesce *ec,
800 			      struct kernel_ethtool_coalesce *kernel_coal,
801 			      struct netlink_ext_ack *extack)
802 {
803 	struct hip04_priv *priv = netdev_priv(netdev);
804 
805 	ec->tx_coalesce_usecs = priv->tx_coalesce_usecs;
806 	ec->tx_max_coalesced_frames = priv->tx_coalesce_frames;
807 
808 	return 0;
809 }
810 
811 static int hip04_set_coalesce(struct net_device *netdev,
812 			      struct ethtool_coalesce *ec,
813 			      struct kernel_ethtool_coalesce *kernel_coal,
814 			      struct netlink_ext_ack *extack)
815 {
816 	struct hip04_priv *priv = netdev_priv(netdev);
817 
818 	if ((ec->tx_coalesce_usecs > HIP04_MAX_TX_COALESCE_USECS ||
819 	     ec->tx_coalesce_usecs < HIP04_MIN_TX_COALESCE_USECS) ||
820 	    (ec->tx_max_coalesced_frames > HIP04_MAX_TX_COALESCE_FRAMES ||
821 	     ec->tx_max_coalesced_frames < HIP04_MIN_TX_COALESCE_FRAMES))
822 		return -EINVAL;
823 
824 	priv->tx_coalesce_usecs = ec->tx_coalesce_usecs;
825 	priv->tx_coalesce_frames = ec->tx_max_coalesced_frames;
826 
827 	return 0;
828 }
829 
830 static void hip04_get_drvinfo(struct net_device *netdev,
831 			      struct ethtool_drvinfo *drvinfo)
832 {
833 	strscpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
834 	strscpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
835 }
836 
837 static const struct ethtool_ops hip04_ethtool_ops = {
838 	.supported_coalesce_params = ETHTOOL_COALESCE_TX_USECS |
839 				     ETHTOOL_COALESCE_TX_MAX_FRAMES,
840 	.get_coalesce		= hip04_get_coalesce,
841 	.set_coalesce		= hip04_set_coalesce,
842 	.get_drvinfo		= hip04_get_drvinfo,
843 };
844 
845 static const struct net_device_ops hip04_netdev_ops = {
846 	.ndo_open		= hip04_mac_open,
847 	.ndo_stop		= hip04_mac_stop,
848 	.ndo_start_xmit		= hip04_mac_start_xmit,
849 	.ndo_set_mac_address	= hip04_set_mac_address,
850 	.ndo_tx_timeout         = hip04_timeout,
851 	.ndo_validate_addr	= eth_validate_addr,
852 };
853 
854 static int hip04_alloc_ring(struct net_device *ndev, struct device *d)
855 {
856 	struct hip04_priv *priv = netdev_priv(ndev);
857 	int i;
858 
859 	priv->tx_desc = dma_alloc_coherent(d,
860 					   TX_DESC_NUM * sizeof(struct tx_desc),
861 					   &priv->tx_desc_dma, GFP_KERNEL);
862 	if (!priv->tx_desc)
863 		return -ENOMEM;
864 
865 	priv->rx_buf_size = RX_BUF_SIZE +
866 			    SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
867 	for (i = 0; i < RX_DESC_NUM; i++) {
868 		priv->rx_buf[i] = netdev_alloc_frag(priv->rx_buf_size);
869 		if (!priv->rx_buf[i])
870 			return -ENOMEM;
871 	}
872 
873 	return 0;
874 }
875 
876 static void hip04_free_ring(struct net_device *ndev, struct device *d)
877 {
878 	struct hip04_priv *priv = netdev_priv(ndev);
879 	int i;
880 
881 	for (i = 0; i < RX_DESC_NUM; i++)
882 		if (priv->rx_buf[i])
883 			skb_free_frag(priv->rx_buf[i]);
884 
885 	for (i = 0; i < TX_DESC_NUM; i++)
886 		if (priv->tx_skb[i])
887 			dev_kfree_skb_any(priv->tx_skb[i]);
888 
889 	dma_free_coherent(d, TX_DESC_NUM * sizeof(struct tx_desc),
890 			  priv->tx_desc, priv->tx_desc_dma);
891 }
892 
893 static int hip04_mac_probe(struct platform_device *pdev)
894 {
895 	struct device *d = &pdev->dev;
896 	struct device_node *node = d->of_node;
897 	struct of_phandle_args arg;
898 	struct net_device *ndev;
899 	struct hip04_priv *priv;
900 	int irq;
901 	int ret;
902 
903 	ndev = alloc_etherdev(sizeof(struct hip04_priv));
904 	if (!ndev)
905 		return -ENOMEM;
906 
907 	priv = netdev_priv(ndev);
908 	priv->dev = d;
909 	priv->ndev = ndev;
910 	platform_set_drvdata(pdev, ndev);
911 	SET_NETDEV_DEV(ndev, &pdev->dev);
912 
913 	priv->base = devm_platform_ioremap_resource(pdev, 0);
914 	if (IS_ERR(priv->base)) {
915 		ret = PTR_ERR(priv->base);
916 		goto init_fail;
917 	}
918 
919 #if defined(CONFIG_HI13X1_GMAC)
920 	priv->sysctrl_base = devm_platform_ioremap_resource(pdev, 1);
921 	if (IS_ERR(priv->sysctrl_base)) {
922 		ret = PTR_ERR(priv->sysctrl_base);
923 		goto init_fail;
924 	}
925 #endif
926 
927 	ret = of_parse_phandle_with_fixed_args(node, "port-handle", 3, 0, &arg);
928 	if (ret < 0) {
929 		dev_warn(d, "no port-handle\n");
930 		goto init_fail;
931 	}
932 
933 	priv->port = arg.args[0];
934 	priv->chan = arg.args[1] * RX_DESC_NUM;
935 	priv->group = arg.args[2];
936 
937 	hrtimer_init(&priv->tx_coalesce_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
938 
939 	/* BQL will try to keep the TX queue as short as possible, but it can't
940 	 * be faster than tx_coalesce_usecs, so we need a fast timeout here,
941 	 * but also long enough to gather up enough frames to ensure we don't
942 	 * get more interrupts than necessary.
943 	 * 200us is enough for 16 frames of 1500 bytes at gigabit ethernet rate
944 	 */
945 	priv->tx_coalesce_frames = TX_DESC_NUM * 3 / 4;
946 	priv->tx_coalesce_usecs = 200;
947 	priv->tx_coalesce_timer.function = tx_done;
948 
949 	priv->map = syscon_node_to_regmap(arg.np);
950 	if (IS_ERR(priv->map)) {
951 		dev_warn(d, "no syscon hisilicon,hip04-ppe\n");
952 		ret = PTR_ERR(priv->map);
953 		goto init_fail;
954 	}
955 
956 	ret = of_get_phy_mode(node, &priv->phy_mode);
957 	if (ret) {
958 		dev_warn(d, "not find phy-mode\n");
959 		goto init_fail;
960 	}
961 
962 	irq = platform_get_irq(pdev, 0);
963 	if (irq < 0) {
964 		ret = irq;
965 		goto init_fail;
966 	}
967 
968 	ret = devm_request_irq(d, irq, hip04_mac_interrupt,
969 			       0, pdev->name, ndev);
970 	if (ret) {
971 		netdev_err(ndev, "devm_request_irq failed\n");
972 		goto init_fail;
973 	}
974 
975 	priv->phy_node = of_parse_phandle(node, "phy-handle", 0);
976 	if (priv->phy_node) {
977 		priv->phy = of_phy_connect(ndev, priv->phy_node,
978 					   &hip04_adjust_link,
979 					   0, priv->phy_mode);
980 		if (!priv->phy) {
981 			ret = -EPROBE_DEFER;
982 			goto init_fail;
983 		}
984 	}
985 
986 	INIT_WORK(&priv->tx_timeout_task, hip04_tx_timeout_task);
987 
988 	ndev->netdev_ops = &hip04_netdev_ops;
989 	ndev->ethtool_ops = &hip04_ethtool_ops;
990 	ndev->watchdog_timeo = TX_TIMEOUT;
991 	ndev->priv_flags |= IFF_UNICAST_FLT;
992 	ndev->irq = irq;
993 	netif_napi_add(ndev, &priv->napi, hip04_rx_poll);
994 
995 	hip04_reset_dreq(priv);
996 	hip04_reset_ppe(priv);
997 	if (priv->phy_mode == PHY_INTERFACE_MODE_MII)
998 		hip04_config_port(ndev, SPEED_100, DUPLEX_FULL);
999 
1000 	hip04_config_fifo(priv);
1001 	eth_hw_addr_random(ndev);
1002 	hip04_update_mac_address(ndev);
1003 
1004 	ret = hip04_alloc_ring(ndev, d);
1005 	if (ret) {
1006 		netdev_err(ndev, "alloc ring fail\n");
1007 		goto alloc_fail;
1008 	}
1009 
1010 	ret = register_netdev(ndev);
1011 	if (ret)
1012 		goto alloc_fail;
1013 
1014 	return 0;
1015 
1016 alloc_fail:
1017 	hip04_free_ring(ndev, d);
1018 init_fail:
1019 	of_node_put(priv->phy_node);
1020 	free_netdev(ndev);
1021 	return ret;
1022 }
1023 
1024 static int hip04_remove(struct platform_device *pdev)
1025 {
1026 	struct net_device *ndev = platform_get_drvdata(pdev);
1027 	struct hip04_priv *priv = netdev_priv(ndev);
1028 	struct device *d = &pdev->dev;
1029 
1030 	if (priv->phy)
1031 		phy_disconnect(priv->phy);
1032 
1033 	hip04_free_ring(ndev, d);
1034 	unregister_netdev(ndev);
1035 	of_node_put(priv->phy_node);
1036 	cancel_work_sync(&priv->tx_timeout_task);
1037 	free_netdev(ndev);
1038 
1039 	return 0;
1040 }
1041 
1042 static const struct of_device_id hip04_mac_match[] = {
1043 	{ .compatible = "hisilicon,hip04-mac" },
1044 	{ }
1045 };
1046 
1047 MODULE_DEVICE_TABLE(of, hip04_mac_match);
1048 
1049 static struct platform_driver hip04_mac_driver = {
1050 	.probe	= hip04_mac_probe,
1051 	.remove	= hip04_remove,
1052 	.driver	= {
1053 		.name		= DRV_NAME,
1054 		.of_match_table	= hip04_mac_match,
1055 	},
1056 };
1057 module_platform_driver(hip04_mac_driver);
1058 
1059 MODULE_DESCRIPTION("HISILICON P04 Ethernet driver");
1060 MODULE_LICENSE("GPL");
1061