1 // SPDX-License-Identifier: GPL-2.0-only
2 /*******************************************************************************
3   This contains the functions to handle the platform driver.
4 
5   Copyright (C) 2007-2011  STMicroelectronics Ltd
6 
7 
8   Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
9 *******************************************************************************/
10 
11 #include <linux/platform_device.h>
12 #include <linux/pm_runtime.h>
13 #include <linux/module.h>
14 #include <linux/io.h>
15 #include <linux/of.h>
16 #include <linux/of_net.h>
17 #include <linux/of_device.h>
18 #include <linux/of_mdio.h>
19 
20 #include "stmmac.h"
21 #include "stmmac_platform.h"
22 
23 #ifdef CONFIG_OF
24 
25 /**
26  * dwmac1000_validate_mcast_bins - validates the number of Multicast filter bins
27  * @dev: struct device of the platform device
28  * @mcast_bins: Multicast filtering bins
29  * Description:
30  * this function validates the number of Multicast filtering bins specified
31  * by the configuration through the device tree. The Synopsys GMAC supports
32  * 64 bins, 128 bins, or 256 bins. "bins" refer to the division of CRC
33  * number space. 64 bins correspond to 6 bits of the CRC, 128 corresponds
34  * to 7 bits, and 256 refers to 8 bits of the CRC. Any other setting is
35  * invalid and will cause the filtering algorithm to use Multicast
36  * promiscuous mode.
37  */
38 static int dwmac1000_validate_mcast_bins(struct device *dev, int mcast_bins)
39 {
40 	int x = mcast_bins;
41 
42 	switch (x) {
43 	case HASH_TABLE_SIZE:
44 	case 128:
45 	case 256:
46 		break;
47 	default:
48 		x = 0;
49 		dev_info(dev, "Hash table entries set to unexpected value %d\n",
50 			 mcast_bins);
51 		break;
52 	}
53 	return x;
54 }
55 
56 /**
57  * dwmac1000_validate_ucast_entries - validate the Unicast address entries
58  * @dev: struct device of the platform device
59  * @ucast_entries: number of Unicast address entries
60  * Description:
61  * This function validates the number of Unicast address entries supported
62  * by a particular Synopsys 10/100/1000 controller. The Synopsys controller
63  * supports 1..32, 64, or 128 Unicast filter entries for it's Unicast filter
64  * logic. This function validates a valid, supported configuration is
65  * selected, and defaults to 1 Unicast address if an unsupported
66  * configuration is selected.
67  */
68 static int dwmac1000_validate_ucast_entries(struct device *dev,
69 					    int ucast_entries)
70 {
71 	int x = ucast_entries;
72 
73 	switch (x) {
74 	case 1 ... 32:
75 	case 64:
76 	case 128:
77 		break;
78 	default:
79 		x = 1;
80 		dev_info(dev, "Unicast table entries set to unexpected value %d\n",
81 			 ucast_entries);
82 		break;
83 	}
84 	return x;
85 }
86 
87 /**
88  * stmmac_axi_setup - parse DT parameters for programming the AXI register
89  * @pdev: platform device
90  * Description:
91  * if required, from device-tree the AXI internal register can be tuned
92  * by using platform parameters.
93  */
94 static struct stmmac_axi *stmmac_axi_setup(struct platform_device *pdev)
95 {
96 	struct device_node *np;
97 	struct stmmac_axi *axi;
98 
99 	np = of_parse_phandle(pdev->dev.of_node, "snps,axi-config", 0);
100 	if (!np)
101 		return NULL;
102 
103 	axi = devm_kzalloc(&pdev->dev, sizeof(*axi), GFP_KERNEL);
104 	if (!axi) {
105 		of_node_put(np);
106 		return ERR_PTR(-ENOMEM);
107 	}
108 
109 	axi->axi_lpi_en = of_property_read_bool(np, "snps,lpi_en");
110 	axi->axi_xit_frm = of_property_read_bool(np, "snps,xit_frm");
111 	axi->axi_kbbe = of_property_read_bool(np, "snps,axi_kbbe");
112 	axi->axi_fb = of_property_read_bool(np, "snps,axi_fb");
113 	axi->axi_mb = of_property_read_bool(np, "snps,axi_mb");
114 	axi->axi_rb =  of_property_read_bool(np, "snps,axi_rb");
115 
116 	if (of_property_read_u32(np, "snps,wr_osr_lmt", &axi->axi_wr_osr_lmt))
117 		axi->axi_wr_osr_lmt = 1;
118 	if (of_property_read_u32(np, "snps,rd_osr_lmt", &axi->axi_rd_osr_lmt))
119 		axi->axi_rd_osr_lmt = 1;
120 	of_property_read_u32_array(np, "snps,blen", axi->axi_blen, AXI_BLEN);
121 	of_node_put(np);
122 
123 	return axi;
124 }
125 
126 /**
127  * stmmac_mtl_setup - parse DT parameters for multiple queues configuration
128  * @pdev: platform device
129  * @plat: enet data
130  */
131 static int stmmac_mtl_setup(struct platform_device *pdev,
132 			    struct plat_stmmacenet_data *plat)
133 {
134 	struct device_node *q_node;
135 	struct device_node *rx_node;
136 	struct device_node *tx_node;
137 	u8 queue = 0;
138 	int ret = 0;
139 
140 	/* For backwards-compatibility with device trees that don't have any
141 	 * snps,mtl-rx-config or snps,mtl-tx-config properties, we fall back
142 	 * to one RX and TX queues each.
143 	 */
144 	plat->rx_queues_to_use = 1;
145 	plat->tx_queues_to_use = 1;
146 
147 	/* First Queue must always be in DCB mode. As MTL_QUEUE_DCB = 1 we need
148 	 * to always set this, otherwise Queue will be classified as AVB
149 	 * (because MTL_QUEUE_AVB = 0).
150 	 */
151 	plat->rx_queues_cfg[0].mode_to_use = MTL_QUEUE_DCB;
152 	plat->tx_queues_cfg[0].mode_to_use = MTL_QUEUE_DCB;
153 
154 	rx_node = of_parse_phandle(pdev->dev.of_node, "snps,mtl-rx-config", 0);
155 	if (!rx_node)
156 		return ret;
157 
158 	tx_node = of_parse_phandle(pdev->dev.of_node, "snps,mtl-tx-config", 0);
159 	if (!tx_node) {
160 		of_node_put(rx_node);
161 		return ret;
162 	}
163 
164 	/* Processing RX queues common config */
165 	if (of_property_read_u32(rx_node, "snps,rx-queues-to-use",
166 				 &plat->rx_queues_to_use))
167 		plat->rx_queues_to_use = 1;
168 
169 	if (of_property_read_bool(rx_node, "snps,rx-sched-sp"))
170 		plat->rx_sched_algorithm = MTL_RX_ALGORITHM_SP;
171 	else if (of_property_read_bool(rx_node, "snps,rx-sched-wsp"))
172 		plat->rx_sched_algorithm = MTL_RX_ALGORITHM_WSP;
173 	else
174 		plat->rx_sched_algorithm = MTL_RX_ALGORITHM_SP;
175 
176 	/* Processing individual RX queue config */
177 	for_each_child_of_node(rx_node, q_node) {
178 		if (queue >= plat->rx_queues_to_use)
179 			break;
180 
181 		if (of_property_read_bool(q_node, "snps,dcb-algorithm"))
182 			plat->rx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB;
183 		else if (of_property_read_bool(q_node, "snps,avb-algorithm"))
184 			plat->rx_queues_cfg[queue].mode_to_use = MTL_QUEUE_AVB;
185 		else
186 			plat->rx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB;
187 
188 		if (of_property_read_u32(q_node, "snps,map-to-dma-channel",
189 					 &plat->rx_queues_cfg[queue].chan))
190 			plat->rx_queues_cfg[queue].chan = queue;
191 		/* TODO: Dynamic mapping to be included in the future */
192 
193 		if (of_property_read_u32(q_node, "snps,priority",
194 					&plat->rx_queues_cfg[queue].prio)) {
195 			plat->rx_queues_cfg[queue].prio = 0;
196 			plat->rx_queues_cfg[queue].use_prio = false;
197 		} else {
198 			plat->rx_queues_cfg[queue].use_prio = true;
199 		}
200 
201 		/* RX queue specific packet type routing */
202 		if (of_property_read_bool(q_node, "snps,route-avcp"))
203 			plat->rx_queues_cfg[queue].pkt_route = PACKET_AVCPQ;
204 		else if (of_property_read_bool(q_node, "snps,route-ptp"))
205 			plat->rx_queues_cfg[queue].pkt_route = PACKET_PTPQ;
206 		else if (of_property_read_bool(q_node, "snps,route-dcbcp"))
207 			plat->rx_queues_cfg[queue].pkt_route = PACKET_DCBCPQ;
208 		else if (of_property_read_bool(q_node, "snps,route-up"))
209 			plat->rx_queues_cfg[queue].pkt_route = PACKET_UPQ;
210 		else if (of_property_read_bool(q_node, "snps,route-multi-broad"))
211 			plat->rx_queues_cfg[queue].pkt_route = PACKET_MCBCQ;
212 		else
213 			plat->rx_queues_cfg[queue].pkt_route = 0x0;
214 
215 		queue++;
216 	}
217 	if (queue != plat->rx_queues_to_use) {
218 		ret = -EINVAL;
219 		dev_err(&pdev->dev, "Not all RX queues were configured\n");
220 		goto out;
221 	}
222 
223 	/* Processing TX queues common config */
224 	if (of_property_read_u32(tx_node, "snps,tx-queues-to-use",
225 				 &plat->tx_queues_to_use))
226 		plat->tx_queues_to_use = 1;
227 
228 	if (of_property_read_bool(tx_node, "snps,tx-sched-wrr"))
229 		plat->tx_sched_algorithm = MTL_TX_ALGORITHM_WRR;
230 	else if (of_property_read_bool(tx_node, "snps,tx-sched-wfq"))
231 		plat->tx_sched_algorithm = MTL_TX_ALGORITHM_WFQ;
232 	else if (of_property_read_bool(tx_node, "snps,tx-sched-dwrr"))
233 		plat->tx_sched_algorithm = MTL_TX_ALGORITHM_DWRR;
234 	else
235 		plat->tx_sched_algorithm = MTL_TX_ALGORITHM_SP;
236 
237 	queue = 0;
238 
239 	/* Processing individual TX queue config */
240 	for_each_child_of_node(tx_node, q_node) {
241 		if (queue >= plat->tx_queues_to_use)
242 			break;
243 
244 		if (of_property_read_u32(q_node, "snps,weight",
245 					 &plat->tx_queues_cfg[queue].weight))
246 			plat->tx_queues_cfg[queue].weight = 0x10 + queue;
247 
248 		if (of_property_read_bool(q_node, "snps,dcb-algorithm")) {
249 			plat->tx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB;
250 		} else if (of_property_read_bool(q_node,
251 						 "snps,avb-algorithm")) {
252 			plat->tx_queues_cfg[queue].mode_to_use = MTL_QUEUE_AVB;
253 
254 			/* Credit Base Shaper parameters used by AVB */
255 			if (of_property_read_u32(q_node, "snps,send_slope",
256 				&plat->tx_queues_cfg[queue].send_slope))
257 				plat->tx_queues_cfg[queue].send_slope = 0x0;
258 			if (of_property_read_u32(q_node, "snps,idle_slope",
259 				&plat->tx_queues_cfg[queue].idle_slope))
260 				plat->tx_queues_cfg[queue].idle_slope = 0x0;
261 			if (of_property_read_u32(q_node, "snps,high_credit",
262 				&plat->tx_queues_cfg[queue].high_credit))
263 				plat->tx_queues_cfg[queue].high_credit = 0x0;
264 			if (of_property_read_u32(q_node, "snps,low_credit",
265 				&plat->tx_queues_cfg[queue].low_credit))
266 				plat->tx_queues_cfg[queue].low_credit = 0x0;
267 		} else {
268 			plat->tx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB;
269 		}
270 
271 		if (of_property_read_u32(q_node, "snps,priority",
272 					&plat->tx_queues_cfg[queue].prio)) {
273 			plat->tx_queues_cfg[queue].prio = 0;
274 			plat->tx_queues_cfg[queue].use_prio = false;
275 		} else {
276 			plat->tx_queues_cfg[queue].use_prio = true;
277 		}
278 
279 		queue++;
280 	}
281 	if (queue != plat->tx_queues_to_use) {
282 		ret = -EINVAL;
283 		dev_err(&pdev->dev, "Not all TX queues were configured\n");
284 		goto out;
285 	}
286 
287 out:
288 	of_node_put(rx_node);
289 	of_node_put(tx_node);
290 	of_node_put(q_node);
291 
292 	return ret;
293 }
294 
295 /**
296  * stmmac_dt_phy - parse device-tree driver parameters to allocate PHY resources
297  * @plat: driver data platform structure
298  * @np: device tree node
299  * @dev: device pointer
300  * Description:
301  * The mdio bus will be allocated in case of a phy transceiver is on board;
302  * it will be NULL if the fixed-link is configured.
303  * If there is the "snps,dwmac-mdio" sub-node the mdio will be allocated
304  * in any case (for DSA, mdio must be registered even if fixed-link).
305  * The table below sums the supported configurations:
306  *	-------------------------------
307  *	snps,phy-addr	|     Y
308  *	-------------------------------
309  *	phy-handle	|     Y
310  *	-------------------------------
311  *	fixed-link	|     N
312  *	-------------------------------
313  *	snps,dwmac-mdio	|
314  *	  even if	|     Y
315  *	fixed-link	|
316  *	-------------------------------
317  *
318  * It returns 0 in case of success otherwise -ENODEV.
319  */
320 static int stmmac_dt_phy(struct plat_stmmacenet_data *plat,
321 			 struct device_node *np, struct device *dev)
322 {
323 	bool mdio = !of_phy_is_fixed_link(np);
324 	static const struct of_device_id need_mdio_ids[] = {
325 		{ .compatible = "snps,dwc-qos-ethernet-4.10" },
326 		{},
327 	};
328 
329 	if (of_match_node(need_mdio_ids, np)) {
330 		plat->mdio_node = of_get_child_by_name(np, "mdio");
331 	} else {
332 		/**
333 		 * If snps,dwmac-mdio is passed from DT, always register
334 		 * the MDIO
335 		 */
336 		for_each_child_of_node(np, plat->mdio_node) {
337 			if (of_device_is_compatible(plat->mdio_node,
338 						    "snps,dwmac-mdio"))
339 				break;
340 		}
341 	}
342 
343 	if (plat->mdio_node) {
344 		dev_dbg(dev, "Found MDIO subnode\n");
345 		mdio = true;
346 	}
347 
348 	if (mdio) {
349 		plat->mdio_bus_data =
350 			devm_kzalloc(dev, sizeof(struct stmmac_mdio_bus_data),
351 				     GFP_KERNEL);
352 		if (!plat->mdio_bus_data)
353 			return -ENOMEM;
354 
355 		plat->mdio_bus_data->needs_reset = true;
356 	}
357 
358 	return 0;
359 }
360 
361 /**
362  * stmmac_of_get_mac_mode - retrieves the interface of the MAC
363  * @np: - device-tree node
364  * Description:
365  * Similar to `of_get_phy_mode()`, this function will retrieve (from
366  * the device-tree) the interface mode on the MAC side. This assumes
367  * that there is mode converter in-between the MAC & PHY
368  * (e.g. GMII-to-RGMII).
369  */
370 static int stmmac_of_get_mac_mode(struct device_node *np)
371 {
372 	const char *pm;
373 	int err, i;
374 
375 	err = of_property_read_string(np, "mac-mode", &pm);
376 	if (err < 0)
377 		return err;
378 
379 	for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++) {
380 		if (!strcasecmp(pm, phy_modes(i)))
381 			return i;
382 	}
383 
384 	return -ENODEV;
385 }
386 
387 /**
388  * stmmac_probe_config_dt - parse device-tree driver parameters
389  * @pdev: platform_device structure
390  * @mac: MAC address to use
391  * Description:
392  * this function is to read the driver parameters from device-tree and
393  * set some private fields that will be used by the main at runtime.
394  */
395 struct plat_stmmacenet_data *
396 stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac)
397 {
398 	struct device_node *np = pdev->dev.of_node;
399 	struct plat_stmmacenet_data *plat;
400 	struct stmmac_dma_cfg *dma_cfg;
401 	int phy_mode;
402 	void *ret;
403 	int rc;
404 
405 	plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
406 	if (!plat)
407 		return ERR_PTR(-ENOMEM);
408 
409 	rc = of_get_mac_address(np, mac);
410 	if (rc) {
411 		if (rc == -EPROBE_DEFER)
412 			return ERR_PTR(rc);
413 
414 		eth_zero_addr(mac);
415 	}
416 
417 	phy_mode = device_get_phy_mode(&pdev->dev);
418 	if (phy_mode < 0)
419 		return ERR_PTR(phy_mode);
420 
421 	plat->phy_interface = phy_mode;
422 	plat->interface = stmmac_of_get_mac_mode(np);
423 	if (plat->interface < 0)
424 		plat->interface = plat->phy_interface;
425 
426 	/* Some wrapper drivers still rely on phy_node. Let's save it while
427 	 * they are not converted to phylink. */
428 	plat->phy_node = of_parse_phandle(np, "phy-handle", 0);
429 
430 	/* PHYLINK automatically parses the phy-handle property */
431 	plat->phylink_node = np;
432 
433 	/* Get max speed of operation from device tree */
434 	of_property_read_u32(np, "max-speed", &plat->max_speed);
435 
436 	plat->bus_id = of_alias_get_id(np, "ethernet");
437 	if (plat->bus_id < 0)
438 		plat->bus_id = 0;
439 
440 	/* Default to phy auto-detection */
441 	plat->phy_addr = -1;
442 
443 	/* Default to get clk_csr from stmmac_clk_csr_set(),
444 	 * or get clk_csr from device tree.
445 	 */
446 	plat->clk_csr = -1;
447 	if (of_property_read_u32(np, "snps,clk-csr", &plat->clk_csr))
448 		of_property_read_u32(np, "clk_csr", &plat->clk_csr);
449 
450 	/* "snps,phy-addr" is not a standard property. Mark it as deprecated
451 	 * and warn of its use. Remove this when phy node support is added.
452 	 */
453 	if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr) == 0)
454 		dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");
455 
456 	/* To Configure PHY by using all device-tree supported properties */
457 	rc = stmmac_dt_phy(plat, np, &pdev->dev);
458 	if (rc)
459 		return ERR_PTR(rc);
460 
461 	of_property_read_u32(np, "tx-fifo-depth", &plat->tx_fifo_size);
462 
463 	of_property_read_u32(np, "rx-fifo-depth", &plat->rx_fifo_size);
464 
465 	plat->force_sf_dma_mode =
466 		of_property_read_bool(np, "snps,force_sf_dma_mode");
467 
468 	plat->en_tx_lpi_clockgating =
469 		of_property_read_bool(np, "snps,en-tx-lpi-clockgating");
470 
471 	/* Set the maxmtu to a default of JUMBO_LEN in case the
472 	 * parameter is not present in the device tree.
473 	 */
474 	plat->maxmtu = JUMBO_LEN;
475 
476 	/* Set default value for multicast hash bins */
477 	plat->multicast_filter_bins = HASH_TABLE_SIZE;
478 
479 	/* Set default value for unicast filter entries */
480 	plat->unicast_filter_entries = 1;
481 
482 	/*
483 	 * Currently only the properties needed on SPEAr600
484 	 * are provided. All other properties should be added
485 	 * once needed on other platforms.
486 	 */
487 	if (of_device_is_compatible(np, "st,spear600-gmac") ||
488 		of_device_is_compatible(np, "snps,dwmac-3.50a") ||
489 		of_device_is_compatible(np, "snps,dwmac-3.70a") ||
490 		of_device_is_compatible(np, "snps,dwmac")) {
491 		/* Note that the max-frame-size parameter as defined in the
492 		 * ePAPR v1.1 spec is defined as max-frame-size, it's
493 		 * actually used as the IEEE definition of MAC Client
494 		 * data, or MTU. The ePAPR specification is confusing as
495 		 * the definition is max-frame-size, but usage examples
496 		 * are clearly MTUs
497 		 */
498 		of_property_read_u32(np, "max-frame-size", &plat->maxmtu);
499 		of_property_read_u32(np, "snps,multicast-filter-bins",
500 				     &plat->multicast_filter_bins);
501 		of_property_read_u32(np, "snps,perfect-filter-entries",
502 				     &plat->unicast_filter_entries);
503 		plat->unicast_filter_entries = dwmac1000_validate_ucast_entries(
504 				&pdev->dev, plat->unicast_filter_entries);
505 		plat->multicast_filter_bins = dwmac1000_validate_mcast_bins(
506 				&pdev->dev, plat->multicast_filter_bins);
507 		plat->has_gmac = 1;
508 		plat->pmt = 1;
509 	}
510 
511 	if (of_device_is_compatible(np, "snps,dwmac-3.40a")) {
512 		plat->has_gmac = 1;
513 		plat->enh_desc = 1;
514 		plat->tx_coe = 1;
515 		plat->bugged_jumbo = 1;
516 		plat->pmt = 1;
517 	}
518 
519 	if (of_device_is_compatible(np, "snps,dwmac-4.00") ||
520 	    of_device_is_compatible(np, "snps,dwmac-4.10a") ||
521 	    of_device_is_compatible(np, "snps,dwmac-4.20a") ||
522 	    of_device_is_compatible(np, "snps,dwmac-5.10a")) {
523 		plat->has_gmac4 = 1;
524 		plat->has_gmac = 0;
525 		plat->pmt = 1;
526 		plat->tso_en = of_property_read_bool(np, "snps,tso");
527 	}
528 
529 	if (of_device_is_compatible(np, "snps,dwmac-3.610") ||
530 		of_device_is_compatible(np, "snps,dwmac-3.710")) {
531 		plat->enh_desc = 1;
532 		plat->bugged_jumbo = 1;
533 		plat->force_sf_dma_mode = 1;
534 	}
535 
536 	if (of_device_is_compatible(np, "snps,dwxgmac")) {
537 		plat->has_xgmac = 1;
538 		plat->pmt = 1;
539 		plat->tso_en = of_property_read_bool(np, "snps,tso");
540 	}
541 
542 	dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*dma_cfg),
543 			       GFP_KERNEL);
544 	if (!dma_cfg) {
545 		stmmac_remove_config_dt(pdev, plat);
546 		return ERR_PTR(-ENOMEM);
547 	}
548 	plat->dma_cfg = dma_cfg;
549 
550 	of_property_read_u32(np, "snps,pbl", &dma_cfg->pbl);
551 	if (!dma_cfg->pbl)
552 		dma_cfg->pbl = DEFAULT_DMA_PBL;
553 	of_property_read_u32(np, "snps,txpbl", &dma_cfg->txpbl);
554 	of_property_read_u32(np, "snps,rxpbl", &dma_cfg->rxpbl);
555 	dma_cfg->pblx8 = !of_property_read_bool(np, "snps,no-pbl-x8");
556 
557 	dma_cfg->aal = of_property_read_bool(np, "snps,aal");
558 	dma_cfg->fixed_burst = of_property_read_bool(np, "snps,fixed-burst");
559 	dma_cfg->mixed_burst = of_property_read_bool(np, "snps,mixed-burst");
560 
561 	plat->force_thresh_dma_mode = of_property_read_bool(np, "snps,force_thresh_dma_mode");
562 	if (plat->force_thresh_dma_mode) {
563 		plat->force_sf_dma_mode = 0;
564 		dev_warn(&pdev->dev,
565 			 "force_sf_dma_mode is ignored if force_thresh_dma_mode is set.\n");
566 	}
567 
568 	of_property_read_u32(np, "snps,ps-speed", &plat->mac_port_sel_speed);
569 
570 	plat->axi = stmmac_axi_setup(pdev);
571 
572 	rc = stmmac_mtl_setup(pdev, plat);
573 	if (rc) {
574 		stmmac_remove_config_dt(pdev, plat);
575 		return ERR_PTR(rc);
576 	}
577 
578 	/* clock setup */
579 	if (!of_device_is_compatible(np, "snps,dwc-qos-ethernet-4.10")) {
580 		plat->stmmac_clk = devm_clk_get(&pdev->dev,
581 						STMMAC_RESOURCE_NAME);
582 		if (IS_ERR(plat->stmmac_clk)) {
583 			dev_warn(&pdev->dev, "Cannot get CSR clock\n");
584 			plat->stmmac_clk = NULL;
585 		}
586 		clk_prepare_enable(plat->stmmac_clk);
587 	}
588 
589 	plat->pclk = devm_clk_get_optional(&pdev->dev, "pclk");
590 	if (IS_ERR(plat->pclk)) {
591 		ret = plat->pclk;
592 		goto error_pclk_get;
593 	}
594 	clk_prepare_enable(plat->pclk);
595 
596 	/* Fall-back to main clock in case of no PTP ref is passed */
597 	plat->clk_ptp_ref = devm_clk_get(&pdev->dev, "ptp_ref");
598 	if (IS_ERR(plat->clk_ptp_ref)) {
599 		plat->clk_ptp_rate = clk_get_rate(plat->stmmac_clk);
600 		plat->clk_ptp_ref = NULL;
601 		dev_info(&pdev->dev, "PTP uses main clock\n");
602 	} else {
603 		plat->clk_ptp_rate = clk_get_rate(plat->clk_ptp_ref);
604 		dev_dbg(&pdev->dev, "PTP rate %d\n", plat->clk_ptp_rate);
605 	}
606 
607 	plat->stmmac_rst = devm_reset_control_get_optional(&pdev->dev,
608 							   STMMAC_RESOURCE_NAME);
609 	if (IS_ERR(plat->stmmac_rst)) {
610 		ret = plat->stmmac_rst;
611 		goto error_hw_init;
612 	}
613 
614 	plat->stmmac_ahb_rst = devm_reset_control_get_optional_shared(
615 							&pdev->dev, "ahb");
616 	if (IS_ERR(plat->stmmac_ahb_rst)) {
617 		ret = plat->stmmac_ahb_rst;
618 		goto error_hw_init;
619 	}
620 
621 	return plat;
622 
623 error_hw_init:
624 	clk_disable_unprepare(plat->pclk);
625 error_pclk_get:
626 	clk_disable_unprepare(plat->stmmac_clk);
627 
628 	return ret;
629 }
630 
631 /**
632  * stmmac_remove_config_dt - undo the effects of stmmac_probe_config_dt()
633  * @pdev: platform_device structure
634  * @plat: driver data platform structure
635  *
636  * Release resources claimed by stmmac_probe_config_dt().
637  */
638 void stmmac_remove_config_dt(struct platform_device *pdev,
639 			     struct plat_stmmacenet_data *plat)
640 {
641 	clk_disable_unprepare(plat->stmmac_clk);
642 	clk_disable_unprepare(plat->pclk);
643 	of_node_put(plat->phy_node);
644 	of_node_put(plat->mdio_node);
645 }
646 #else
647 struct plat_stmmacenet_data *
648 stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac)
649 {
650 	return ERR_PTR(-EINVAL);
651 }
652 
653 void stmmac_remove_config_dt(struct platform_device *pdev,
654 			     struct plat_stmmacenet_data *plat)
655 {
656 }
657 #endif /* CONFIG_OF */
658 EXPORT_SYMBOL_GPL(stmmac_probe_config_dt);
659 EXPORT_SYMBOL_GPL(stmmac_remove_config_dt);
660 
661 int stmmac_get_platform_resources(struct platform_device *pdev,
662 				  struct stmmac_resources *stmmac_res)
663 {
664 	memset(stmmac_res, 0, sizeof(*stmmac_res));
665 
666 	/* Get IRQ information early to have an ability to ask for deferred
667 	 * probe if needed before we went too far with resource allocation.
668 	 */
669 	stmmac_res->irq = platform_get_irq_byname(pdev, "macirq");
670 	if (stmmac_res->irq < 0)
671 		return stmmac_res->irq;
672 
673 	/* On some platforms e.g. SPEAr the wake up irq differs from the mac irq
674 	 * The external wake up irq can be passed through the platform code
675 	 * named as "eth_wake_irq"
676 	 *
677 	 * In case the wake up interrupt is not passed from the platform
678 	 * so the driver will continue to use the mac irq (ndev->irq)
679 	 */
680 	stmmac_res->wol_irq =
681 		platform_get_irq_byname_optional(pdev, "eth_wake_irq");
682 	if (stmmac_res->wol_irq < 0) {
683 		if (stmmac_res->wol_irq == -EPROBE_DEFER)
684 			return -EPROBE_DEFER;
685 		dev_info(&pdev->dev, "IRQ eth_wake_irq not found\n");
686 		stmmac_res->wol_irq = stmmac_res->irq;
687 	}
688 
689 	stmmac_res->lpi_irq =
690 		platform_get_irq_byname_optional(pdev, "eth_lpi");
691 	if (stmmac_res->lpi_irq < 0) {
692 		if (stmmac_res->lpi_irq == -EPROBE_DEFER)
693 			return -EPROBE_DEFER;
694 		dev_info(&pdev->dev, "IRQ eth_lpi not found\n");
695 	}
696 
697 	stmmac_res->addr = devm_platform_ioremap_resource(pdev, 0);
698 
699 	return PTR_ERR_OR_ZERO(stmmac_res->addr);
700 }
701 EXPORT_SYMBOL_GPL(stmmac_get_platform_resources);
702 
703 /**
704  * stmmac_pltfr_remove
705  * @pdev: platform device pointer
706  * Description: this function calls the main to free the net resources
707  * and calls the platforms hook and release the resources (e.g. mem).
708  */
709 int stmmac_pltfr_remove(struct platform_device *pdev)
710 {
711 	struct net_device *ndev = platform_get_drvdata(pdev);
712 	struct stmmac_priv *priv = netdev_priv(ndev);
713 	struct plat_stmmacenet_data *plat = priv->plat;
714 	int ret = stmmac_dvr_remove(&pdev->dev);
715 
716 	if (plat->exit)
717 		plat->exit(pdev, plat->bsp_priv);
718 
719 	stmmac_remove_config_dt(pdev, plat);
720 
721 	return ret;
722 }
723 EXPORT_SYMBOL_GPL(stmmac_pltfr_remove);
724 
725 /**
726  * stmmac_pltfr_suspend
727  * @dev: device pointer
728  * Description: this function is invoked when suspend the driver and it direcly
729  * call the main suspend function and then, if required, on some platform, it
730  * can call an exit helper.
731  */
732 static int __maybe_unused stmmac_pltfr_suspend(struct device *dev)
733 {
734 	int ret;
735 	struct net_device *ndev = dev_get_drvdata(dev);
736 	struct stmmac_priv *priv = netdev_priv(ndev);
737 	struct platform_device *pdev = to_platform_device(dev);
738 
739 	ret = stmmac_suspend(dev);
740 	if (priv->plat->exit)
741 		priv->plat->exit(pdev, priv->plat->bsp_priv);
742 
743 	return ret;
744 }
745 
746 /**
747  * stmmac_pltfr_resume
748  * @dev: device pointer
749  * Description: this function is invoked when resume the driver before calling
750  * the main resume function, on some platforms, it can call own init helper
751  * if required.
752  */
753 static int __maybe_unused stmmac_pltfr_resume(struct device *dev)
754 {
755 	struct net_device *ndev = dev_get_drvdata(dev);
756 	struct stmmac_priv *priv = netdev_priv(ndev);
757 	struct platform_device *pdev = to_platform_device(dev);
758 
759 	if (priv->plat->init)
760 		priv->plat->init(pdev, priv->plat->bsp_priv);
761 
762 	return stmmac_resume(dev);
763 }
764 
765 static int __maybe_unused stmmac_runtime_suspend(struct device *dev)
766 {
767 	struct net_device *ndev = dev_get_drvdata(dev);
768 	struct stmmac_priv *priv = netdev_priv(ndev);
769 
770 	stmmac_bus_clks_config(priv, false);
771 
772 	return 0;
773 }
774 
775 static int __maybe_unused stmmac_runtime_resume(struct device *dev)
776 {
777 	struct net_device *ndev = dev_get_drvdata(dev);
778 	struct stmmac_priv *priv = netdev_priv(ndev);
779 
780 	return stmmac_bus_clks_config(priv, true);
781 }
782 
783 static int __maybe_unused stmmac_pltfr_noirq_suspend(struct device *dev)
784 {
785 	struct net_device *ndev = dev_get_drvdata(dev);
786 	struct stmmac_priv *priv = netdev_priv(ndev);
787 	int ret;
788 
789 	if (!netif_running(ndev))
790 		return 0;
791 
792 	if (!device_may_wakeup(priv->device) || !priv->plat->pmt) {
793 		/* Disable clock in case of PWM is off */
794 		clk_disable_unprepare(priv->plat->clk_ptp_ref);
795 
796 		ret = pm_runtime_force_suspend(dev);
797 		if (ret)
798 			return ret;
799 	}
800 
801 	return 0;
802 }
803 
804 static int __maybe_unused stmmac_pltfr_noirq_resume(struct device *dev)
805 {
806 	struct net_device *ndev = dev_get_drvdata(dev);
807 	struct stmmac_priv *priv = netdev_priv(ndev);
808 	int ret;
809 
810 	if (!netif_running(ndev))
811 		return 0;
812 
813 	if (!device_may_wakeup(priv->device) || !priv->plat->pmt) {
814 		/* enable the clk previously disabled */
815 		ret = pm_runtime_force_resume(dev);
816 		if (ret)
817 			return ret;
818 
819 		ret = clk_prepare_enable(priv->plat->clk_ptp_ref);
820 		if (ret < 0) {
821 			netdev_warn(priv->dev,
822 				    "failed to enable PTP reference clock: %pe\n",
823 				    ERR_PTR(ret));
824 			return ret;
825 		}
826 	}
827 
828 	return 0;
829 }
830 
831 const struct dev_pm_ops stmmac_pltfr_pm_ops = {
832 	SET_SYSTEM_SLEEP_PM_OPS(stmmac_pltfr_suspend, stmmac_pltfr_resume)
833 	SET_RUNTIME_PM_OPS(stmmac_runtime_suspend, stmmac_runtime_resume, NULL)
834 	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(stmmac_pltfr_noirq_suspend, stmmac_pltfr_noirq_resume)
835 };
836 EXPORT_SYMBOL_GPL(stmmac_pltfr_pm_ops);
837 
838 MODULE_DESCRIPTION("STMMAC 10/100/1000 Ethernet platform support");
839 MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
840 MODULE_LICENSE("GPL");
841