1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Applied Micro X-Gene SoC Ethernet Driver
3  *
4  * Copyright (c) 2014, Applied Micro Circuits Corporation
5  * Authors: Iyappan Subramanian <isubramanian@apm.com>
6  *	    Ravi Patel <rapatel@apm.com>
7  *	    Keyur Chudgar <kchudgar@apm.com>
8  */
9 
10 #include "xgene_enet_main.h"
11 #include "xgene_enet_hw.h"
12 
13 static void xgene_enet_ring_init(struct xgene_enet_desc_ring *ring)
14 {
15 	u32 *ring_cfg = ring->state;
16 	u64 addr = ring->dma;
17 	enum xgene_enet_ring_cfgsize cfgsize = ring->cfgsize;
18 
19 	ring_cfg[4] |= (1 << SELTHRSH_POS) &
20 			CREATE_MASK(SELTHRSH_POS, SELTHRSH_LEN);
21 	ring_cfg[3] |= ACCEPTLERR;
22 	ring_cfg[2] |= QCOHERENT;
23 
24 	addr >>= 8;
25 	ring_cfg[2] |= (addr << RINGADDRL_POS) &
26 			CREATE_MASK_ULL(RINGADDRL_POS, RINGADDRL_LEN);
27 	addr >>= RINGADDRL_LEN;
28 	ring_cfg[3] |= addr & CREATE_MASK_ULL(RINGADDRH_POS, RINGADDRH_LEN);
29 	ring_cfg[3] |= ((u32)cfgsize << RINGSIZE_POS) &
30 			CREATE_MASK(RINGSIZE_POS, RINGSIZE_LEN);
31 }
32 
33 static void xgene_enet_ring_set_type(struct xgene_enet_desc_ring *ring)
34 {
35 	u32 *ring_cfg = ring->state;
36 	bool is_bufpool;
37 	u32 val;
38 
39 	is_bufpool = xgene_enet_is_bufpool(ring->id);
40 	val = (is_bufpool) ? RING_BUFPOOL : RING_REGULAR;
41 	ring_cfg[4] |= (val << RINGTYPE_POS) &
42 			CREATE_MASK(RINGTYPE_POS, RINGTYPE_LEN);
43 
44 	if (is_bufpool) {
45 		ring_cfg[3] |= (BUFPOOL_MODE << RINGMODE_POS) &
46 				CREATE_MASK(RINGMODE_POS, RINGMODE_LEN);
47 	}
48 }
49 
50 static void xgene_enet_ring_set_recombbuf(struct xgene_enet_desc_ring *ring)
51 {
52 	u32 *ring_cfg = ring->state;
53 
54 	ring_cfg[3] |= RECOMBBUF;
55 	ring_cfg[3] |= (0xf << RECOMTIMEOUTL_POS) &
56 			CREATE_MASK(RECOMTIMEOUTL_POS, RECOMTIMEOUTL_LEN);
57 	ring_cfg[4] |= 0x7 & CREATE_MASK(RECOMTIMEOUTH_POS, RECOMTIMEOUTH_LEN);
58 }
59 
60 static void xgene_enet_ring_wr32(struct xgene_enet_desc_ring *ring,
61 				 u32 offset, u32 data)
62 {
63 	struct xgene_enet_pdata *pdata = netdev_priv(ring->ndev);
64 
65 	iowrite32(data, pdata->ring_csr_addr + offset);
66 }
67 
68 static void xgene_enet_ring_rd32(struct xgene_enet_desc_ring *ring,
69 				 u32 offset, u32 *data)
70 {
71 	struct xgene_enet_pdata *pdata = netdev_priv(ring->ndev);
72 
73 	*data = ioread32(pdata->ring_csr_addr + offset);
74 }
75 
76 static void xgene_enet_write_ring_state(struct xgene_enet_desc_ring *ring)
77 {
78 	struct xgene_enet_pdata *pdata = netdev_priv(ring->ndev);
79 	int i;
80 
81 	xgene_enet_ring_wr32(ring, CSR_RING_CONFIG, ring->num);
82 	for (i = 0; i < pdata->ring_ops->num_ring_config; i++) {
83 		xgene_enet_ring_wr32(ring, CSR_RING_WR_BASE + (i * 4),
84 				     ring->state[i]);
85 	}
86 }
87 
88 static void xgene_enet_clr_ring_state(struct xgene_enet_desc_ring *ring)
89 {
90 	memset(ring->state, 0, sizeof(ring->state));
91 	xgene_enet_write_ring_state(ring);
92 }
93 
94 static void xgene_enet_set_ring_state(struct xgene_enet_desc_ring *ring)
95 {
96 	xgene_enet_ring_set_type(ring);
97 
98 	if (xgene_enet_ring_owner(ring->id) == RING_OWNER_ETH0 ||
99 	    xgene_enet_ring_owner(ring->id) == RING_OWNER_ETH1)
100 		xgene_enet_ring_set_recombbuf(ring);
101 
102 	xgene_enet_ring_init(ring);
103 	xgene_enet_write_ring_state(ring);
104 }
105 
106 static void xgene_enet_set_ring_id(struct xgene_enet_desc_ring *ring)
107 {
108 	u32 ring_id_val, ring_id_buf;
109 	bool is_bufpool;
110 
111 	is_bufpool = xgene_enet_is_bufpool(ring->id);
112 
113 	ring_id_val = ring->id & GENMASK(9, 0);
114 	ring_id_val |= OVERWRITE;
115 
116 	ring_id_buf = (ring->num << 9) & GENMASK(18, 9);
117 	ring_id_buf |= PREFETCH_BUF_EN;
118 	if (is_bufpool)
119 		ring_id_buf |= IS_BUFFER_POOL;
120 
121 	xgene_enet_ring_wr32(ring, CSR_RING_ID, ring_id_val);
122 	xgene_enet_ring_wr32(ring, CSR_RING_ID_BUF, ring_id_buf);
123 }
124 
125 static void xgene_enet_clr_desc_ring_id(struct xgene_enet_desc_ring *ring)
126 {
127 	u32 ring_id;
128 
129 	ring_id = ring->id | OVERWRITE;
130 	xgene_enet_ring_wr32(ring, CSR_RING_ID, ring_id);
131 	xgene_enet_ring_wr32(ring, CSR_RING_ID_BUF, 0);
132 }
133 
134 static struct xgene_enet_desc_ring *xgene_enet_setup_ring(
135 				    struct xgene_enet_desc_ring *ring)
136 {
137 	u32 size = ring->size;
138 	u32 i, data;
139 	bool is_bufpool;
140 
141 	xgene_enet_clr_ring_state(ring);
142 	xgene_enet_set_ring_state(ring);
143 	xgene_enet_set_ring_id(ring);
144 
145 	ring->slots = xgene_enet_get_numslots(ring->id, size);
146 
147 	is_bufpool = xgene_enet_is_bufpool(ring->id);
148 	if (is_bufpool || xgene_enet_ring_owner(ring->id) != RING_OWNER_CPU)
149 		return ring;
150 
151 	for (i = 0; i < ring->slots; i++)
152 		xgene_enet_mark_desc_slot_empty(&ring->raw_desc[i]);
153 
154 	xgene_enet_ring_rd32(ring, CSR_RING_NE_INT_MODE, &data);
155 	data |= BIT(31 - xgene_enet_ring_bufnum(ring->id));
156 	xgene_enet_ring_wr32(ring, CSR_RING_NE_INT_MODE, data);
157 
158 	return ring;
159 }
160 
161 static void xgene_enet_clear_ring(struct xgene_enet_desc_ring *ring)
162 {
163 	u32 data;
164 	bool is_bufpool;
165 
166 	is_bufpool = xgene_enet_is_bufpool(ring->id);
167 	if (is_bufpool || xgene_enet_ring_owner(ring->id) != RING_OWNER_CPU)
168 		goto out;
169 
170 	xgene_enet_ring_rd32(ring, CSR_RING_NE_INT_MODE, &data);
171 	data &= ~BIT(31 - xgene_enet_ring_bufnum(ring->id));
172 	xgene_enet_ring_wr32(ring, CSR_RING_NE_INT_MODE, data);
173 
174 out:
175 	xgene_enet_clr_desc_ring_id(ring);
176 	xgene_enet_clr_ring_state(ring);
177 }
178 
179 static void xgene_enet_wr_cmd(struct xgene_enet_desc_ring *ring, int count)
180 {
181 	iowrite32(count, ring->cmd);
182 }
183 
184 static u32 xgene_enet_ring_len(struct xgene_enet_desc_ring *ring)
185 {
186 	u32 __iomem *cmd_base = ring->cmd_base;
187 	u32 ring_state, num_msgs;
188 
189 	ring_state = ioread32(&cmd_base[1]);
190 	num_msgs = GET_VAL(NUMMSGSINQ, ring_state);
191 
192 	return num_msgs;
193 }
194 
195 void xgene_enet_parse_error(struct xgene_enet_desc_ring *ring,
196 			    enum xgene_enet_err_code status)
197 {
198 	switch (status) {
199 	case INGRESS_CRC:
200 		ring->rx_crc_errors++;
201 		break;
202 	case INGRESS_CHECKSUM:
203 	case INGRESS_CHECKSUM_COMPUTE:
204 		ring->rx_errors++;
205 		break;
206 	case INGRESS_TRUNC_FRAME:
207 		ring->rx_frame_errors++;
208 		break;
209 	case INGRESS_PKT_LEN:
210 		ring->rx_length_errors++;
211 		break;
212 	case INGRESS_PKT_UNDER:
213 		ring->rx_frame_errors++;
214 		break;
215 	case INGRESS_FIFO_OVERRUN:
216 		ring->rx_fifo_errors++;
217 		break;
218 	default:
219 		break;
220 	}
221 }
222 
223 static void xgene_enet_wr_csr(struct xgene_enet_pdata *pdata,
224 			      u32 offset, u32 val)
225 {
226 	void __iomem *addr = pdata->eth_csr_addr + offset;
227 
228 	iowrite32(val, addr);
229 }
230 
231 static void xgene_enet_wr_ring_if(struct xgene_enet_pdata *pdata,
232 				  u32 offset, u32 val)
233 {
234 	void __iomem *addr = pdata->eth_ring_if_addr + offset;
235 
236 	iowrite32(val, addr);
237 }
238 
239 static void xgene_enet_wr_diag_csr(struct xgene_enet_pdata *pdata,
240 				   u32 offset, u32 val)
241 {
242 	void __iomem *addr = pdata->eth_diag_csr_addr + offset;
243 
244 	iowrite32(val, addr);
245 }
246 
247 static void xgene_enet_wr_mcx_csr(struct xgene_enet_pdata *pdata,
248 				  u32 offset, u32 val)
249 {
250 	void __iomem *addr = pdata->mcx_mac_csr_addr + offset;
251 
252 	iowrite32(val, addr);
253 }
254 
255 void xgene_enet_wr_mac(struct xgene_enet_pdata *pdata, u32 wr_addr, u32 wr_data)
256 {
257 	void __iomem *addr, *wr, *cmd, *cmd_done;
258 	struct net_device *ndev = pdata->ndev;
259 	u8 wait = 10;
260 	u32 done;
261 
262 	if (pdata->mdio_driver && ndev->phydev &&
263 	    phy_interface_mode_is_rgmii(pdata->phy_mode)) {
264 		struct mii_bus *bus = ndev->phydev->mdio.bus;
265 
266 		return xgene_mdio_wr_mac(bus->priv, wr_addr, wr_data);
267 	}
268 
269 	addr = pdata->mcx_mac_addr + MAC_ADDR_REG_OFFSET;
270 	wr = pdata->mcx_mac_addr + MAC_WRITE_REG_OFFSET;
271 	cmd = pdata->mcx_mac_addr + MAC_COMMAND_REG_OFFSET;
272 	cmd_done = pdata->mcx_mac_addr + MAC_COMMAND_DONE_REG_OFFSET;
273 
274 	spin_lock(&pdata->mac_lock);
275 	iowrite32(wr_addr, addr);
276 	iowrite32(wr_data, wr);
277 	iowrite32(XGENE_ENET_WR_CMD, cmd);
278 
279 	while (!(done = ioread32(cmd_done)) && wait--)
280 		udelay(1);
281 
282 	if (!done)
283 		netdev_err(ndev, "mac write failed, addr: %04x data: %08x\n",
284 			   wr_addr, wr_data);
285 
286 	iowrite32(0, cmd);
287 	spin_unlock(&pdata->mac_lock);
288 }
289 
290 static void xgene_enet_rd_csr(struct xgene_enet_pdata *pdata,
291 			      u32 offset, u32 *val)
292 {
293 	void __iomem *addr = pdata->eth_csr_addr + offset;
294 
295 	*val = ioread32(addr);
296 }
297 
298 static void xgene_enet_rd_diag_csr(struct xgene_enet_pdata *pdata,
299 				   u32 offset, u32 *val)
300 {
301 	void __iomem *addr = pdata->eth_diag_csr_addr + offset;
302 
303 	*val = ioread32(addr);
304 }
305 
306 static void xgene_enet_rd_mcx_csr(struct xgene_enet_pdata *pdata,
307 				  u32 offset, u32 *val)
308 {
309 	void __iomem *addr = pdata->mcx_mac_csr_addr + offset;
310 
311 	*val = ioread32(addr);
312 }
313 
314 u32 xgene_enet_rd_mac(struct xgene_enet_pdata *pdata, u32 rd_addr)
315 {
316 	void __iomem *addr, *rd, *cmd, *cmd_done;
317 	struct net_device *ndev = pdata->ndev;
318 	u32 done, rd_data;
319 	u8 wait = 10;
320 
321 	if (pdata->mdio_driver && ndev->phydev &&
322 	    phy_interface_mode_is_rgmii(pdata->phy_mode)) {
323 		struct mii_bus *bus = ndev->phydev->mdio.bus;
324 
325 		return xgene_mdio_rd_mac(bus->priv, rd_addr);
326 	}
327 
328 	addr = pdata->mcx_mac_addr + MAC_ADDR_REG_OFFSET;
329 	rd = pdata->mcx_mac_addr + MAC_READ_REG_OFFSET;
330 	cmd = pdata->mcx_mac_addr + MAC_COMMAND_REG_OFFSET;
331 	cmd_done = pdata->mcx_mac_addr + MAC_COMMAND_DONE_REG_OFFSET;
332 
333 	spin_lock(&pdata->mac_lock);
334 	iowrite32(rd_addr, addr);
335 	iowrite32(XGENE_ENET_RD_CMD, cmd);
336 
337 	while (!(done = ioread32(cmd_done)) && wait--)
338 		udelay(1);
339 
340 	if (!done)
341 		netdev_err(ndev, "mac read failed, addr: %04x\n", rd_addr);
342 
343 	rd_data = ioread32(rd);
344 	iowrite32(0, cmd);
345 	spin_unlock(&pdata->mac_lock);
346 
347 	return rd_data;
348 }
349 
350 u32 xgene_enet_rd_stat(struct xgene_enet_pdata *pdata, u32 rd_addr)
351 {
352 	void __iomem *addr, *rd, *cmd, *cmd_done;
353 	u32 done, rd_data;
354 	u8 wait = 10;
355 
356 	addr = pdata->mcx_stats_addr + STAT_ADDR_REG_OFFSET;
357 	rd = pdata->mcx_stats_addr + STAT_READ_REG_OFFSET;
358 	cmd = pdata->mcx_stats_addr + STAT_COMMAND_REG_OFFSET;
359 	cmd_done = pdata->mcx_stats_addr + STAT_COMMAND_DONE_REG_OFFSET;
360 
361 	spin_lock(&pdata->stats_lock);
362 	iowrite32(rd_addr, addr);
363 	iowrite32(XGENE_ENET_RD_CMD, cmd);
364 
365 	while (!(done = ioread32(cmd_done)) && wait--)
366 		udelay(1);
367 
368 	if (!done)
369 		netdev_err(pdata->ndev, "mac stats read failed, addr: %04x\n",
370 			   rd_addr);
371 
372 	rd_data = ioread32(rd);
373 	iowrite32(0, cmd);
374 	spin_unlock(&pdata->stats_lock);
375 
376 	return rd_data;
377 }
378 
379 static void xgene_gmac_set_mac_addr(struct xgene_enet_pdata *pdata)
380 {
381 	u32 addr0, addr1;
382 	u8 *dev_addr = pdata->ndev->dev_addr;
383 
384 	addr0 = (dev_addr[3] << 24) | (dev_addr[2] << 16) |
385 		(dev_addr[1] << 8) | dev_addr[0];
386 	addr1 = (dev_addr[5] << 24) | (dev_addr[4] << 16);
387 
388 	xgene_enet_wr_mac(pdata, STATION_ADDR0_ADDR, addr0);
389 	xgene_enet_wr_mac(pdata, STATION_ADDR1_ADDR, addr1);
390 }
391 
392 static int xgene_enet_ecc_init(struct xgene_enet_pdata *pdata)
393 {
394 	struct net_device *ndev = pdata->ndev;
395 	u32 data;
396 	u8 wait = 10;
397 
398 	xgene_enet_wr_diag_csr(pdata, ENET_CFG_MEM_RAM_SHUTDOWN_ADDR, 0x0);
399 	do {
400 		usleep_range(100, 110);
401 		xgene_enet_rd_diag_csr(pdata, ENET_BLOCK_MEM_RDY_ADDR, &data);
402 	} while ((data != 0xffffffff) && wait--);
403 
404 	if (data != 0xffffffff) {
405 		netdev_err(ndev, "Failed to release memory from shutdown\n");
406 		return -ENODEV;
407 	}
408 
409 	return 0;
410 }
411 
412 static void xgene_gmac_reset(struct xgene_enet_pdata *pdata)
413 {
414 	xgene_enet_wr_mac(pdata, MAC_CONFIG_1_ADDR, SOFT_RESET1);
415 	xgene_enet_wr_mac(pdata, MAC_CONFIG_1_ADDR, 0);
416 }
417 
418 static void xgene_enet_configure_clock(struct xgene_enet_pdata *pdata)
419 {
420 	struct device *dev = &pdata->pdev->dev;
421 
422 	if (dev->of_node) {
423 		struct clk *parent = clk_get_parent(pdata->clk);
424 
425 		switch (pdata->phy_speed) {
426 		case SPEED_10:
427 			clk_set_rate(parent, 2500000);
428 			break;
429 		case SPEED_100:
430 			clk_set_rate(parent, 25000000);
431 			break;
432 		default:
433 			clk_set_rate(parent, 125000000);
434 			break;
435 		}
436 	}
437 #ifdef CONFIG_ACPI
438 	else {
439 		switch (pdata->phy_speed) {
440 		case SPEED_10:
441 			acpi_evaluate_object(ACPI_HANDLE(dev),
442 					     "S10", NULL, NULL);
443 			break;
444 		case SPEED_100:
445 			acpi_evaluate_object(ACPI_HANDLE(dev),
446 					     "S100", NULL, NULL);
447 			break;
448 		default:
449 			acpi_evaluate_object(ACPI_HANDLE(dev),
450 					     "S1G", NULL, NULL);
451 			break;
452 		}
453 	}
454 #endif
455 }
456 
457 static void xgene_gmac_set_speed(struct xgene_enet_pdata *pdata)
458 {
459 	u32 icm0, icm2, mc2;
460 	u32 intf_ctl, rgmii, value;
461 
462 	xgene_enet_rd_mcx_csr(pdata, ICM_CONFIG0_REG_0_ADDR, &icm0);
463 	xgene_enet_rd_mcx_csr(pdata, ICM_CONFIG2_REG_0_ADDR, &icm2);
464 	mc2 = xgene_enet_rd_mac(pdata, MAC_CONFIG_2_ADDR);
465 	intf_ctl = xgene_enet_rd_mac(pdata, INTERFACE_CONTROL_ADDR);
466 	xgene_enet_rd_csr(pdata, RGMII_REG_0_ADDR, &rgmii);
467 
468 	switch (pdata->phy_speed) {
469 	case SPEED_10:
470 		ENET_INTERFACE_MODE2_SET(&mc2, 1);
471 		intf_ctl &= ~(ENET_LHD_MODE | ENET_GHD_MODE);
472 		CFG_MACMODE_SET(&icm0, 0);
473 		CFG_WAITASYNCRD_SET(&icm2, 500);
474 		rgmii &= ~CFG_SPEED_1250;
475 		break;
476 	case SPEED_100:
477 		ENET_INTERFACE_MODE2_SET(&mc2, 1);
478 		intf_ctl &= ~ENET_GHD_MODE;
479 		intf_ctl |= ENET_LHD_MODE;
480 		CFG_MACMODE_SET(&icm0, 1);
481 		CFG_WAITASYNCRD_SET(&icm2, 80);
482 		rgmii &= ~CFG_SPEED_1250;
483 		break;
484 	default:
485 		ENET_INTERFACE_MODE2_SET(&mc2, 2);
486 		intf_ctl &= ~ENET_LHD_MODE;
487 		intf_ctl |= ENET_GHD_MODE;
488 		CFG_MACMODE_SET(&icm0, 2);
489 		CFG_WAITASYNCRD_SET(&icm2, 0);
490 		CFG_TXCLK_MUXSEL0_SET(&rgmii, pdata->tx_delay);
491 		CFG_RXCLK_MUXSEL0_SET(&rgmii, pdata->rx_delay);
492 		rgmii |= CFG_SPEED_1250;
493 
494 		xgene_enet_rd_csr(pdata, DEBUG_REG_ADDR, &value);
495 		value |= CFG_BYPASS_UNISEC_TX | CFG_BYPASS_UNISEC_RX;
496 		xgene_enet_wr_csr(pdata, DEBUG_REG_ADDR, value);
497 		break;
498 	}
499 
500 	mc2 |= FULL_DUPLEX2 | PAD_CRC | LENGTH_CHK;
501 	xgene_enet_wr_mac(pdata, MAC_CONFIG_2_ADDR, mc2);
502 	xgene_enet_wr_mac(pdata, INTERFACE_CONTROL_ADDR, intf_ctl);
503 	xgene_enet_wr_csr(pdata, RGMII_REG_0_ADDR, rgmii);
504 	xgene_enet_configure_clock(pdata);
505 
506 	xgene_enet_wr_mcx_csr(pdata, ICM_CONFIG0_REG_0_ADDR, icm0);
507 	xgene_enet_wr_mcx_csr(pdata, ICM_CONFIG2_REG_0_ADDR, icm2);
508 }
509 
510 static void xgene_enet_set_frame_size(struct xgene_enet_pdata *pdata, int size)
511 {
512 	xgene_enet_wr_mac(pdata, MAX_FRAME_LEN_ADDR, size);
513 }
514 
515 static void xgene_gmac_enable_tx_pause(struct xgene_enet_pdata *pdata,
516 				       bool enable)
517 {
518 	u32 data;
519 
520 	xgene_enet_rd_mcx_csr(pdata, CSR_ECM_CFG_0_ADDR, &data);
521 
522 	if (enable)
523 		data |= MULTI_DPF_AUTOCTRL | PAUSE_XON_EN;
524 	else
525 		data &= ~(MULTI_DPF_AUTOCTRL | PAUSE_XON_EN);
526 
527 	xgene_enet_wr_mcx_csr(pdata, CSR_ECM_CFG_0_ADDR, data);
528 }
529 
530 static void xgene_gmac_flowctl_tx(struct xgene_enet_pdata *pdata, bool enable)
531 {
532 	u32 data;
533 
534 	data = xgene_enet_rd_mac(pdata, MAC_CONFIG_1_ADDR);
535 
536 	if (enable)
537 		data |= TX_FLOW_EN;
538 	else
539 		data &= ~TX_FLOW_EN;
540 
541 	xgene_enet_wr_mac(pdata, MAC_CONFIG_1_ADDR, data);
542 
543 	pdata->mac_ops->enable_tx_pause(pdata, enable);
544 }
545 
546 static void xgene_gmac_flowctl_rx(struct xgene_enet_pdata *pdata, bool enable)
547 {
548 	u32 data;
549 
550 	data = xgene_enet_rd_mac(pdata, MAC_CONFIG_1_ADDR);
551 
552 	if (enable)
553 		data |= RX_FLOW_EN;
554 	else
555 		data &= ~RX_FLOW_EN;
556 
557 	xgene_enet_wr_mac(pdata, MAC_CONFIG_1_ADDR, data);
558 }
559 
560 static void xgene_gmac_init(struct xgene_enet_pdata *pdata)
561 {
562 	u32 value;
563 
564 	if (!pdata->mdio_driver)
565 		xgene_gmac_reset(pdata);
566 
567 	xgene_gmac_set_speed(pdata);
568 	xgene_gmac_set_mac_addr(pdata);
569 
570 	/* Adjust MDC clock frequency */
571 	value = xgene_enet_rd_mac(pdata, MII_MGMT_CONFIG_ADDR);
572 	MGMT_CLOCK_SEL_SET(&value, 7);
573 	xgene_enet_wr_mac(pdata, MII_MGMT_CONFIG_ADDR, value);
574 
575 	/* Enable drop if bufpool not available */
576 	xgene_enet_rd_csr(pdata, RSIF_CONFIG_REG_ADDR, &value);
577 	value |= CFG_RSIF_FPBUFF_TIMEOUT_EN;
578 	xgene_enet_wr_csr(pdata, RSIF_CONFIG_REG_ADDR, value);
579 
580 	/* Rtype should be copied from FP */
581 	xgene_enet_wr_csr(pdata, RSIF_RAM_DBG_REG0_ADDR, 0);
582 
583 	/* Configure HW pause frame generation */
584 	xgene_enet_rd_mcx_csr(pdata, CSR_MULTI_DPF0_ADDR, &value);
585 	value = (DEF_QUANTA << 16) | (value & 0xFFFF);
586 	xgene_enet_wr_mcx_csr(pdata, CSR_MULTI_DPF0_ADDR, value);
587 
588 	xgene_enet_wr_csr(pdata, RXBUF_PAUSE_THRESH, DEF_PAUSE_THRES);
589 	xgene_enet_wr_csr(pdata, RXBUF_PAUSE_OFF_THRESH, DEF_PAUSE_OFF_THRES);
590 
591 	xgene_gmac_flowctl_tx(pdata, pdata->tx_pause);
592 	xgene_gmac_flowctl_rx(pdata, pdata->rx_pause);
593 
594 	/* Rx-Tx traffic resume */
595 	xgene_enet_wr_csr(pdata, CFG_LINK_AGGR_RESUME_0_ADDR, TX_PORT0);
596 
597 	xgene_enet_rd_mcx_csr(pdata, RX_DV_GATE_REG_0_ADDR, &value);
598 	value &= ~TX_DV_GATE_EN0;
599 	value &= ~RX_DV_GATE_EN0;
600 	value |= RESUME_RX0;
601 	xgene_enet_wr_mcx_csr(pdata, RX_DV_GATE_REG_0_ADDR, value);
602 
603 	xgene_enet_wr_csr(pdata, CFG_BYPASS_ADDR, RESUME_TX);
604 }
605 
606 static void xgene_gmac_get_drop_cnt(struct xgene_enet_pdata *pdata,
607 				    u32 *rx, u32 *tx)
608 {
609 	u32 count;
610 
611 	xgene_enet_rd_mcx_csr(pdata, ICM_ECM_DROP_COUNT_REG0_ADDR, &count);
612 	*rx = ICM_DROP_COUNT(count);
613 	*tx = ECM_DROP_COUNT(count);
614 	/* Errata: 10GE_4 - Fix ICM_ECM_DROP_COUNT not clear-on-read */
615 	xgene_enet_rd_mcx_csr(pdata, ECM_CONFIG0_REG_0_ADDR, &count);
616 }
617 
618 static void xgene_enet_config_ring_if_assoc(struct xgene_enet_pdata *pdata)
619 {
620 	u32 val = 0xffffffff;
621 
622 	xgene_enet_wr_ring_if(pdata, ENET_CFGSSQMIWQASSOC_ADDR, val);
623 	xgene_enet_wr_ring_if(pdata, ENET_CFGSSQMIFPQASSOC_ADDR, val);
624 	xgene_enet_wr_ring_if(pdata, ENET_CFGSSQMIQMLITEWQASSOC_ADDR, val);
625 	xgene_enet_wr_ring_if(pdata, ENET_CFGSSQMIQMLITEFPQASSOC_ADDR, val);
626 }
627 
628 static void xgene_enet_cle_bypass(struct xgene_enet_pdata *pdata,
629 				  u32 dst_ring_num, u16 bufpool_id,
630 				  u16 nxtbufpool_id)
631 {
632 	u32 cb;
633 	u32 fpsel, nxtfpsel;
634 
635 	fpsel = xgene_enet_get_fpsel(bufpool_id);
636 	nxtfpsel = xgene_enet_get_fpsel(nxtbufpool_id);
637 
638 	xgene_enet_rd_csr(pdata, CLE_BYPASS_REG0_0_ADDR, &cb);
639 	cb |= CFG_CLE_BYPASS_EN0;
640 	CFG_CLE_IP_PROTOCOL0_SET(&cb, 3);
641 	CFG_CLE_IP_HDR_LEN_SET(&cb, 0);
642 	xgene_enet_wr_csr(pdata, CLE_BYPASS_REG0_0_ADDR, cb);
643 
644 	xgene_enet_rd_csr(pdata, CLE_BYPASS_REG1_0_ADDR, &cb);
645 	CFG_CLE_DSTQID0_SET(&cb, dst_ring_num);
646 	CFG_CLE_FPSEL0_SET(&cb, fpsel);
647 	CFG_CLE_NXTFPSEL0_SET(&cb, nxtfpsel);
648 	xgene_enet_wr_csr(pdata, CLE_BYPASS_REG1_0_ADDR, cb);
649 }
650 
651 static void xgene_gmac_rx_enable(struct xgene_enet_pdata *pdata)
652 {
653 	u32 data;
654 
655 	data = xgene_enet_rd_mac(pdata, MAC_CONFIG_1_ADDR);
656 	xgene_enet_wr_mac(pdata, MAC_CONFIG_1_ADDR, data | RX_EN);
657 }
658 
659 static void xgene_gmac_tx_enable(struct xgene_enet_pdata *pdata)
660 {
661 	u32 data;
662 
663 	data = xgene_enet_rd_mac(pdata, MAC_CONFIG_1_ADDR);
664 	xgene_enet_wr_mac(pdata, MAC_CONFIG_1_ADDR, data | TX_EN);
665 }
666 
667 static void xgene_gmac_rx_disable(struct xgene_enet_pdata *pdata)
668 {
669 	u32 data;
670 
671 	data = xgene_enet_rd_mac(pdata, MAC_CONFIG_1_ADDR);
672 	xgene_enet_wr_mac(pdata, MAC_CONFIG_1_ADDR, data & ~RX_EN);
673 }
674 
675 static void xgene_gmac_tx_disable(struct xgene_enet_pdata *pdata)
676 {
677 	u32 data;
678 
679 	data = xgene_enet_rd_mac(pdata, MAC_CONFIG_1_ADDR);
680 	xgene_enet_wr_mac(pdata, MAC_CONFIG_1_ADDR, data & ~TX_EN);
681 }
682 
683 bool xgene_ring_mgr_init(struct xgene_enet_pdata *p)
684 {
685 	if (!ioread32(p->ring_csr_addr + CLKEN_ADDR))
686 		return false;
687 
688 	if (ioread32(p->ring_csr_addr + SRST_ADDR))
689 		return false;
690 
691 	return true;
692 }
693 
694 static int xgene_enet_reset(struct xgene_enet_pdata *pdata)
695 {
696 	struct device *dev = &pdata->pdev->dev;
697 
698 	if (!xgene_ring_mgr_init(pdata))
699 		return -ENODEV;
700 
701 	if (pdata->mdio_driver) {
702 		xgene_enet_config_ring_if_assoc(pdata);
703 		return 0;
704 	}
705 
706 	if (dev->of_node) {
707 		clk_prepare_enable(pdata->clk);
708 		udelay(5);
709 		clk_disable_unprepare(pdata->clk);
710 		udelay(5);
711 		clk_prepare_enable(pdata->clk);
712 		udelay(5);
713 	} else {
714 #ifdef CONFIG_ACPI
715 		acpi_status status;
716 
717 		status = acpi_evaluate_object(ACPI_HANDLE(&pdata->pdev->dev),
718 					      "_RST", NULL, NULL);
719 		if (ACPI_FAILURE(status)) {
720 			acpi_evaluate_object(ACPI_HANDLE(&pdata->pdev->dev),
721 					     "_INI", NULL, NULL);
722 		}
723 #endif
724 	}
725 
726 	xgene_enet_ecc_init(pdata);
727 	xgene_enet_config_ring_if_assoc(pdata);
728 
729 	return 0;
730 }
731 
732 static void xgene_enet_clear(struct xgene_enet_pdata *pdata,
733 			     struct xgene_enet_desc_ring *ring)
734 {
735 	u32 addr, data;
736 
737 	if (xgene_enet_is_bufpool(ring->id)) {
738 		addr = ENET_CFGSSQMIFPRESET_ADDR;
739 		data = BIT(xgene_enet_get_fpsel(ring->id));
740 	} else {
741 		addr = ENET_CFGSSQMIWQRESET_ADDR;
742 		data = BIT(xgene_enet_ring_bufnum(ring->id));
743 	}
744 
745 	xgene_enet_wr_ring_if(pdata, addr, data);
746 }
747 
748 static void xgene_gport_shutdown(struct xgene_enet_pdata *pdata)
749 {
750 	struct device *dev = &pdata->pdev->dev;
751 
752 	if (dev->of_node) {
753 		if (!IS_ERR(pdata->clk))
754 			clk_disable_unprepare(pdata->clk);
755 	}
756 }
757 
758 static u32 xgene_enet_flowctrl_cfg(struct net_device *ndev)
759 {
760 	struct xgene_enet_pdata *pdata = netdev_priv(ndev);
761 	struct phy_device *phydev = ndev->phydev;
762 	u16 lcladv, rmtadv = 0;
763 	u32 rx_pause, tx_pause;
764 	u8 flowctl = 0;
765 
766 	if (!phydev->duplex || !pdata->pause_autoneg)
767 		return 0;
768 
769 	if (pdata->tx_pause)
770 		flowctl |= FLOW_CTRL_TX;
771 
772 	if (pdata->rx_pause)
773 		flowctl |= FLOW_CTRL_RX;
774 
775 	lcladv = mii_advertise_flowctrl(flowctl);
776 
777 	if (phydev->pause)
778 		rmtadv = LPA_PAUSE_CAP;
779 
780 	if (phydev->asym_pause)
781 		rmtadv |= LPA_PAUSE_ASYM;
782 
783 	flowctl = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
784 	tx_pause = !!(flowctl & FLOW_CTRL_TX);
785 	rx_pause = !!(flowctl & FLOW_CTRL_RX);
786 
787 	if (tx_pause != pdata->tx_pause) {
788 		pdata->tx_pause = tx_pause;
789 		pdata->mac_ops->flowctl_tx(pdata, pdata->tx_pause);
790 	}
791 
792 	if (rx_pause != pdata->rx_pause) {
793 		pdata->rx_pause = rx_pause;
794 		pdata->mac_ops->flowctl_rx(pdata, pdata->rx_pause);
795 	}
796 
797 	return 0;
798 }
799 
800 static void xgene_enet_adjust_link(struct net_device *ndev)
801 {
802 	struct xgene_enet_pdata *pdata = netdev_priv(ndev);
803 	const struct xgene_mac_ops *mac_ops = pdata->mac_ops;
804 	struct phy_device *phydev = ndev->phydev;
805 
806 	if (phydev->link) {
807 		if (pdata->phy_speed != phydev->speed) {
808 			pdata->phy_speed = phydev->speed;
809 			mac_ops->set_speed(pdata);
810 			mac_ops->rx_enable(pdata);
811 			mac_ops->tx_enable(pdata);
812 			phy_print_status(phydev);
813 		}
814 
815 		xgene_enet_flowctrl_cfg(ndev);
816 	} else {
817 		mac_ops->rx_disable(pdata);
818 		mac_ops->tx_disable(pdata);
819 		pdata->phy_speed = SPEED_UNKNOWN;
820 		phy_print_status(phydev);
821 	}
822 }
823 
824 #ifdef CONFIG_ACPI
825 static struct acpi_device *acpi_phy_find_device(struct device *dev)
826 {
827 	struct fwnode_reference_args args;
828 	struct fwnode_handle *fw_node;
829 	int status;
830 
831 	fw_node = acpi_fwnode_handle(ACPI_COMPANION(dev));
832 	status = acpi_node_get_property_reference(fw_node, "phy-handle", 0,
833 						  &args);
834 	if (ACPI_FAILURE(status) || !is_acpi_device_node(args.fwnode)) {
835 		dev_dbg(dev, "No matching phy in ACPI table\n");
836 		return NULL;
837 	}
838 
839 	return to_acpi_device_node(args.fwnode);
840 }
841 #endif
842 
843 int xgene_enet_phy_connect(struct net_device *ndev)
844 {
845 	struct xgene_enet_pdata *pdata = netdev_priv(ndev);
846 	struct device_node *np;
847 	struct phy_device *phy_dev;
848 	struct device *dev = &pdata->pdev->dev;
849 	int i;
850 
851 	if (dev->of_node) {
852 		for (i = 0 ; i < 2; i++) {
853 			np = of_parse_phandle(dev->of_node, "phy-handle", i);
854 			phy_dev = of_phy_connect(ndev, np,
855 						 &xgene_enet_adjust_link,
856 						 0, pdata->phy_mode);
857 			of_node_put(np);
858 			if (phy_dev)
859 				break;
860 		}
861 
862 		if (!phy_dev) {
863 			netdev_err(ndev, "Could not connect to PHY\n");
864 			return -ENODEV;
865 		}
866 	} else {
867 #ifdef CONFIG_ACPI
868 		struct acpi_device *adev = acpi_phy_find_device(dev);
869 		if (adev)
870 			phy_dev = adev->driver_data;
871 		else
872 			phy_dev = NULL;
873 
874 		if (!phy_dev ||
875 		    phy_connect_direct(ndev, phy_dev, &xgene_enet_adjust_link,
876 				       pdata->phy_mode)) {
877 			netdev_err(ndev, "Could not connect to PHY\n");
878 			return  -ENODEV;
879 		}
880 #else
881 		return -ENODEV;
882 #endif
883 	}
884 
885 	pdata->phy_speed = SPEED_UNKNOWN;
886 	phy_remove_link_mode(phy_dev, ETHTOOL_LINK_MODE_10baseT_Half_BIT);
887 	phy_remove_link_mode(phy_dev, ETHTOOL_LINK_MODE_100baseT_Half_BIT);
888 	phy_remove_link_mode(phy_dev, ETHTOOL_LINK_MODE_1000baseT_Half_BIT);
889 	phy_support_asym_pause(phy_dev);
890 
891 	return 0;
892 }
893 
894 static int xgene_mdiobus_register(struct xgene_enet_pdata *pdata,
895 				  struct mii_bus *mdio)
896 {
897 	struct device *dev = &pdata->pdev->dev;
898 	struct net_device *ndev = pdata->ndev;
899 	struct phy_device *phy;
900 	struct device_node *child_np;
901 	struct device_node *mdio_np = NULL;
902 	u32 phy_addr;
903 	int ret;
904 
905 	if (dev->of_node) {
906 		for_each_child_of_node(dev->of_node, child_np) {
907 			if (of_device_is_compatible(child_np,
908 						    "apm,xgene-mdio")) {
909 				mdio_np = child_np;
910 				break;
911 			}
912 		}
913 
914 		if (!mdio_np) {
915 			netdev_dbg(ndev, "No mdio node in the dts\n");
916 			return -ENXIO;
917 		}
918 
919 		return of_mdiobus_register(mdio, mdio_np);
920 	}
921 
922 	/* Mask out all PHYs from auto probing. */
923 	mdio->phy_mask = ~0;
924 
925 	/* Register the MDIO bus */
926 	ret = mdiobus_register(mdio);
927 	if (ret)
928 		return ret;
929 
930 	ret = device_property_read_u32(dev, "phy-channel", &phy_addr);
931 	if (ret)
932 		ret = device_property_read_u32(dev, "phy-addr", &phy_addr);
933 	if (ret)
934 		return -EINVAL;
935 
936 	phy = xgene_enet_phy_register(mdio, phy_addr);
937 	if (!phy)
938 		return -EIO;
939 
940 	return ret;
941 }
942 
943 int xgene_enet_mdio_config(struct xgene_enet_pdata *pdata)
944 {
945 	struct net_device *ndev = pdata->ndev;
946 	struct mii_bus *mdio_bus;
947 	int ret;
948 
949 	mdio_bus = mdiobus_alloc();
950 	if (!mdio_bus)
951 		return -ENOMEM;
952 
953 	mdio_bus->name = "APM X-Gene MDIO bus";
954 	mdio_bus->read = xgene_mdio_rgmii_read;
955 	mdio_bus->write = xgene_mdio_rgmii_write;
956 	snprintf(mdio_bus->id, MII_BUS_ID_SIZE, "%s-%s", "xgene-mii",
957 		 ndev->name);
958 
959 	mdio_bus->priv = (void __force *)pdata->mcx_mac_addr;
960 	mdio_bus->parent = &pdata->pdev->dev;
961 
962 	ret = xgene_mdiobus_register(pdata, mdio_bus);
963 	if (ret) {
964 		netdev_err(ndev, "Failed to register MDIO bus\n");
965 		mdiobus_free(mdio_bus);
966 		return ret;
967 	}
968 	pdata->mdio_bus = mdio_bus;
969 
970 	ret = xgene_enet_phy_connect(ndev);
971 	if (ret)
972 		xgene_enet_mdio_remove(pdata);
973 
974 	return ret;
975 }
976 
977 void xgene_enet_phy_disconnect(struct xgene_enet_pdata *pdata)
978 {
979 	struct net_device *ndev = pdata->ndev;
980 
981 	if (ndev->phydev)
982 		phy_disconnect(ndev->phydev);
983 }
984 
985 void xgene_enet_mdio_remove(struct xgene_enet_pdata *pdata)
986 {
987 	struct net_device *ndev = pdata->ndev;
988 
989 	if (ndev->phydev)
990 		phy_disconnect(ndev->phydev);
991 
992 	mdiobus_unregister(pdata->mdio_bus);
993 	mdiobus_free(pdata->mdio_bus);
994 	pdata->mdio_bus = NULL;
995 }
996 
997 const struct xgene_mac_ops xgene_gmac_ops = {
998 	.init = xgene_gmac_init,
999 	.reset = xgene_gmac_reset,
1000 	.rx_enable = xgene_gmac_rx_enable,
1001 	.tx_enable = xgene_gmac_tx_enable,
1002 	.rx_disable = xgene_gmac_rx_disable,
1003 	.tx_disable = xgene_gmac_tx_disable,
1004 	.get_drop_cnt = xgene_gmac_get_drop_cnt,
1005 	.set_speed = xgene_gmac_set_speed,
1006 	.set_mac_addr = xgene_gmac_set_mac_addr,
1007 	.set_framesize = xgene_enet_set_frame_size,
1008 	.enable_tx_pause = xgene_gmac_enable_tx_pause,
1009 	.flowctl_tx     = xgene_gmac_flowctl_tx,
1010 	.flowctl_rx     = xgene_gmac_flowctl_rx,
1011 };
1012 
1013 const struct xgene_port_ops xgene_gport_ops = {
1014 	.reset = xgene_enet_reset,
1015 	.clear = xgene_enet_clear,
1016 	.cle_bypass = xgene_enet_cle_bypass,
1017 	.shutdown = xgene_gport_shutdown,
1018 };
1019 
1020 struct xgene_ring_ops xgene_ring1_ops = {
1021 	.num_ring_config = NUM_RING_CONFIG,
1022 	.num_ring_id_shift = 6,
1023 	.setup = xgene_enet_setup_ring,
1024 	.clear = xgene_enet_clear_ring,
1025 	.wr_cmd = xgene_enet_wr_cmd,
1026 	.len = xgene_enet_ring_len,
1027 };
1028