summaryrefslogtreecommitdiffstats
path: root/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
blob: 8a280b48e3a9fd0c7ada914f2ceea3618e9e34cf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
/*******************************************************************************
  This contains the functions to handle the platform driver.

  Copyright (C) 2007-2011  STMicroelectronics Ltd

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
*******************************************************************************/

#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_net.h>
#include <linux/of_device.h>
#include <linux/of_mdio.h>

#include "stmmac.h"
#include "stmmac_platform.h"

#ifdef CONFIG_OF

/**
 * dwmac1000_validate_mcast_bins - validates the number of Multicast filter bins
 * @mcast_bins: Multicast filtering bins
 * Description:
 * this function validates the number of Multicast filtering bins specified
 * by the configuration through the device tree. The Synopsys GMAC supports
 * 64 bins, 128 bins, or 256 bins. "bins" refer to the division of CRC
 * number space. 64 bins correspond to 6 bits of the CRC, 128 corresponds
 * to 7 bits, and 256 refers to 8 bits of the CRC. Any other setting is
 * invalid and will cause the filtering algorithm to use Multicast
 * promiscuous mode.
 */
static int dwmac1000_validate_mcast_bins(int mcast_bins)
{
	int x = mcast_bins;

	switch (x) {
	case HASH_TABLE_SIZE:
	case 128:
	case 256:
		break;
	default:
		x = 0;
		pr_info("Hash table entries set to unexpected value %d",
			mcast_bins);
		break;
	}
	return x;
}

/**
 * dwmac1000_validate_ucast_entries - validate the Unicast address entries
 * @ucast_entries: number of Unicast address entries
 * Description:
 * This function validates the number of Unicast address entries supported
 * by a particular Synopsys 10/100/1000 controller. The Synopsys controller
 * supports 1, 32, 64, or 128 Unicast filter entries for it's Unicast filter
 * logic. This function validates a valid, supported configuration is
 * selected, and defaults to 1 Unicast address if an unsupported
 * configuration is selected.
 */
static int dwmac1000_validate_ucast_entries(int ucast_entries)
{
	int x = ucast_entries;

	switch (x) {
	case 1:
	case 32:
	case 64:
	case 128:
		break;
	default:
		x = 1;
		pr_info("Unicast table entries set to unexpected value %d\n",
			ucast_entries);
		break;
	}
	return x;
}

/**
 * stmmac_axi_setup - parse DT parameters for programming the AXI register
 * @pdev: platform device
 * @priv: driver private struct.
 * Description:
 * if required, from device-tree the AXI internal register can be tuned
 * by using platform parameters.
 */
static struct stmmac_axi *stmmac_axi_setup(struct platform_device *pdev)
{
	struct device_node *np;
	struct stmmac_axi *axi;

	np = of_parse_phandle(pdev->dev.of_node, "snps,axi-config", 0);
	if (!np)
		return NULL;

	axi = devm_kzalloc(&pdev->dev, sizeof(*axi), GFP_KERNEL);
	if (!axi) {
		of_node_put(np);
		return ERR_PTR(-ENOMEM);
	}

	axi->axi_lpi_en = of_property_read_bool(np, "snps,lpi_en");
	axi->axi_xit_frm = of_property_read_bool(np, "snps,xit_frm");
	axi->axi_kbbe = of_property_read_bool(np, "snps,axi_kbbe");
	axi->axi_fb = of_property_read_bool(np, "snps,axi_fb");
	axi->axi_mb = of_property_read_bool(np, "snps,axi_mb");
	axi->axi_rb =  of_property_read_bool(np, "snps,axi_rb");

	if (of_property_read_u32(np, "snps,wr_osr_lmt", &axi->axi_wr_osr_lmt))
		axi->axi_wr_osr_lmt = 1;
	if (of_property_read_u32(np, "snps,rd_osr_lmt", &axi->axi_rd_osr_lmt))
		axi->axi_rd_osr_lmt = 1;
	of_property_read_u32_array(np, "snps,blen", axi->axi_blen, AXI_BLEN);
	of_node_put(np);

	return axi;
}

/**
 * stmmac_mtl_setup - parse DT parameters for multiple queues configuration
 * @pdev: platform device
 */
static void stmmac_mtl_setup(struct platform_device *pdev,
			     struct plat_stmmacenet_data *plat)
{
	struct device_node *q_node;
	struct device_node *rx_node;
	struct device_node *tx_node;
	u8 queue = 0;

	/* For backwards-compatibility with device trees that don't have any
	 * snps,mtl-rx-config or snps,mtl-tx-config properties, we fall back
	 * to one RX and TX queues each.
	 */
	plat->rx_queues_to_use = 1;
	plat->tx_queues_to_use = 1;

	rx_node = of_parse_phandle(pdev->dev.of_node, "snps,mtl-rx-config", 0);
	if (!rx_node)
		return;

	tx_node = of_parse_phandle(pdev->dev.of_node, "snps,mtl-tx-config", 0);
	if (!tx_node) {
		of_node_put(rx_node);
		return;
	}

	/* Processing RX queues common config */
	if (of_property_read_u8(rx_node, "snps,rx-queues-to-use",
				&plat->rx_queues_to_use))
		plat->rx_queues_to_use = 1;

	if (of_property_read_bool(rx_node, "snps,rx-sched-sp"))
		plat->rx_sched_algorithm = MTL_RX_ALGORITHM_SP;
	else if (of_property_read_bool(rx_node, "snps,rx-sched-wsp"))
		plat->rx_sched_algorithm = MTL_RX_ALGORITHM_WSP;
	else
		plat->rx_sched_algorithm = MTL_RX_ALGORITHM_SP;

	/* Processing individual RX queue config */
	for_each_child_of_node(rx_node, q_node) {
		if (queue >= plat->rx_queues_to_use)
			break;

		if (of_property_read_bool(q_node, "snps,dcb-algorithm"))
			plat->rx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB;
		else if (of_property_read_bool(q_node, "snps,avb-algorithm"))
			plat->rx_queues_cfg[queue].mode_to_use = MTL_QUEUE_AVB;
		else
			plat->rx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB;

		if (of_property_read_u8(q_node, "snps,map-to-dma-channel",
					&plat->rx_queues_cfg[queue].chan))
			plat->rx_queues_cfg[queue].chan = queue;
		/* TODO: Dynamic mapping to be included in the future */

		if (of_property_read_u32(q_node, "snps,priority",
					&plat->rx_queues_cfg[queue].prio)) {
			plat->rx_queues_cfg[queue].prio = 0;
			plat->rx_queues_cfg[queue].use_prio = false;
		} else {
			plat->rx_queues_cfg[queue].use_prio = true;
		}

		/* RX queue specific packet type routing */
		if (of_property_read_bool(q_node, "snps,route-avcp"))
			plat->rx_queues_cfg[queue].pkt_route = PACKET_AVCPQ;
		else if (of_property_read_bool(q_node, "snps,route-ptp"))
			plat->rx_queues_cfg[queue].pkt_route = PACKET_PTPQ;
		else if (of_property_read_bool(q_node, "snps,route-dcbcp"))
			plat->rx_queues_cfg[queue].pkt_route = PACKET_DCBCPQ;
		else if (of_property_read_bool(q_node, "snps,route-up"))
			plat->rx_queues_cfg[queue].pkt_route = PACKET_UPQ;
		else if (of_property_read_bool(q_node, "snps,route-multi-broad"))
			plat->rx_queues_cfg[queue].pkt_route = PACKET_MCBCQ;
		else
			plat->rx_queues_cfg[queue].pkt_route = 0x0;

		queue++;
	}

	/* Processing TX queues common config */
	if (of_property_read_u8(tx_node, "snps,tx-queues-to-use",
				&plat->tx_queues_to_use))
		plat->tx_queues_to_use = 1;

	if (of_property_read_bool(tx_node, "snps,tx-sched-wrr"))
		plat->tx_sched_algorithm = MTL_TX_ALGORITHM_WRR;
	else if (of_property_read_bool(tx_node, "snps,tx-sched-wfq"))
		plat->tx_sched_algorithm = MTL_TX_ALGORITHM_WFQ;
	else if (of_property_read_bool(tx_node, "snps,tx-sched-dwrr"))
		plat->tx_sched_algorithm = MTL_TX_ALGORITHM_DWRR;
	else if (of_property_read_bool(tx_node, "snps,tx-sched-sp"))
		plat->tx_sched_algorithm = MTL_TX_ALGORITHM_SP;
	else
		plat->tx_sched_algorithm = MTL_TX_ALGORITHM_SP;

	queue = 0;

	/* Processing individual TX queue config */
	for_each_child_of_node(tx_node, q_node) {
		if (queue >= plat->tx_queues_to_use)
			break;

		if (of_property_read_u8(q_node, "snps,weight",
					&plat->tx_queues_cfg[queue].weight))
			plat->tx_queues_cfg[queue].weight = 0x10 + queue;

		if (of_property_read_bool(q_node, "snps,dcb-algorithm")) {
			plat->tx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB;
		} else if (of_property_read_bool(q_node,
						 "snps,avb-algorithm")) {
			plat->tx_queues_cfg[queue].mode_to_use = MTL_QUEUE_AVB;

			/* Credit Base Shaper parameters used by AVB */
			if (of_property_read_u32(q_node, "snps,send_slope",
				&plat->tx_queues_cfg[queue].send_slope))
				plat->tx_queues_cfg[queue].send_slope = 0x0;
			if (of_property_read_u32(q_node, "snps,idle_slope",
				&plat->tx_queues_cfg[queue].idle_slope))
				plat->tx_queues_cfg[queue].idle_slope = 0x0;
			if (of_property_read_u32(q_node, "snps,high_credit",
				&plat->tx_queues_cfg[queue].high_credit))
				plat->tx_queues_cfg[queue].high_credit = 0x0;
			if (of_property_read_u32(q_node, "snps,low_credit",
				&plat->tx_queues_cfg[queue].low_credit))
				plat->tx_queues_cfg[queue].low_credit = 0x0;
		} else {
			plat->tx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB;
		}

		if (of_property_read_u32(q_node, "snps,priority",
					&plat->tx_queues_cfg[queue].prio)) {
			plat->tx_queues_cfg[queue].prio = 0;
			plat->tx_queues_cfg[queue].use_prio = false;
		} else {
			plat->tx_queues_cfg[queue].use_prio = true;
		}

		queue++;
	}

	of_node_put(rx_node);
	of_node_put(tx_node);
	of_node_put(q_node);
}

/**
 * stmmac_dt_phy - parse device-tree driver parameters to allocate PHY resources
 * @plat: driver data platform structure
 * @np: device tree node
 * @dev: device pointer
 * Description:
 * The mdio bus will be allocated in case of a phy transceiver is on board;
 * it will be NULL if the fixed-link is configured.
 * If there is the "snps,dwmac-mdio" sub-node the mdio will be allocated
 * in any case (for DSA, mdio must be registered even if fixed-link).
 * The table below sums the supported configurations:
 *	-------------------------------
 *	snps,phy-addr	|     Y
 *	-------------------------------
 *	phy-handle	|     Y
 *	-------------------------------
 *	fixed-link	|     N
 *	-------------------------------
 *	snps,dwmac-mdio	|
 *	  even if	|     Y
 *	fixed-link	|
 *	-------------------------------
 *
 * It returns 0 in case of success otherwise -ENODEV.
 */
static int stmmac_dt_phy(struct plat_stmmacenet_data *plat,
			 struct device_node *np, struct device *dev)
{
	bool mdio = true;
	static const struct of_device_id need_mdio_ids[] = {
		{ .compatible = "snps,dwc-qos-ethernet-4.10" },
		{ .compatible = "allwinner,sun8i-a83t-emac" },
		{ .compatible = "allwinner,sun8i-h3-emac" },
		{ .compatible = "allwinner,sun8i-v3s-emac" },
		{ .compatible = "allwinner,sun50i-a64-emac" },
		{},
	};

	/* If phy-handle property is passed from DT, use it as the PHY */
	plat->phy_node = of_parse_phandle(np, "phy-handle", 0);
	if (plat->phy_node)
		dev_dbg(dev, "Found phy-handle subnode\n");

	/* If phy-handle is not specified, check if we have a fixed-phy */
	if (!plat->phy_node && of_phy_is_fixed_link(np)) {
		if ((of_phy_register_fixed_link(np) < 0))
			return -ENODEV;

		dev_dbg(dev, "Found fixed-link subnode\n");
		plat->phy_node = of_node_get(np);
		mdio = false;
	}

	if (of_match_node(need_mdio_ids, np)) {
		plat->mdio_node = of_get_child_by_name(np, "mdio");
	} else {
		/**
		 * If snps,dwmac-mdio is passed from DT, always register
		 * the MDIO
		 */
		for_each_child_of_node(np, plat->mdio_node) {
			if (of_device_is_compatible(plat->mdio_node,
						    "snps,dwmac-mdio"))
				break;
		}
	}

	if (plat->mdio_node) {
		dev_dbg(dev, "Found MDIO subnode\n");
		mdio = true;
	}

	if (mdio)
		plat->mdio_bus_data =
			devm_kzalloc(dev, sizeof(struct stmmac_mdio_bus_data),
				     GFP_KERNEL);
	return 0;
}

/**
 * stmmac_probe_config_dt - parse device-tree driver parameters
 * @pdev: platform_device structure
 * @mac: MAC address to use
 * Description:
 * this function is to read the driver parameters from device-tree and
 * set some private fields that will be used by the main at runtime.
 */
struct plat_stmmacenet_data *
stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
{
	struct device_node *np = pdev->dev.of_node;
	struct plat_stmmacenet_data *plat;
	struct stmmac_dma_cfg *dma_cfg;

	plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
	if (!plat)
		return ERR_PTR(-ENOMEM);

	*mac = of_get_mac_address(np);
	plat->interface = of_get_phy_mode(np);

	/* Get max speed of operation from device tree */
	if (of_property_read_u32(np, "max-speed", &plat->max_speed))
		plat->max_speed = -1;

	plat->bus_id = of_alias_get_id(np, "ethernet");
	if (plat->bus_id < 0)
		plat->bus_id = 0;

	/* Default to phy auto-detection */
	plat->phy_addr = -1;

	/* "snps,phy-addr" is not a standard property. Mark it as deprecated
	 * and warn of its use. Remove this when phy node support is added.
	 */
	if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr) == 0)
		dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");

	/* To Configure PHY by using all device-tree supported properties */
	if (stmmac_dt_phy(plat, np, &pdev->dev))
		return ERR_PTR(-ENODEV);

	of_property_read_u32(np, "tx-fifo-depth", &plat->tx_fifo_size);

	of_property_read_u32(np, "rx-fifo-depth", &plat->rx_fifo_size);

	plat->force_sf_dma_mode =
		of_property_read_bool(np, "snps,force_sf_dma_mode");

	plat->en_tx_lpi_clockgating =
		of_property_read_bool(np, "snps,en-tx-lpi-clockgating");

	/* Set the maxmtu to a default of JUMBO_LEN in case the
	 * parameter is not present in the device tree.
	 */
	plat->maxmtu = JUMBO_LEN;

	/* Set default value for multicast hash bins */
	plat->multicast_filter_bins = HASH_TABLE_SIZE;

	/* Set default value for unicast filter entries */
	plat->unicast_filter_entries = 1;

	/*
	 * Currently only the properties needed on SPEAr600
	 * are provided. All other properties should be added
	 * once needed on other platforms.
	 */
	if (of_device_is_compatible(np, "st,spear600-gmac") ||
		of_device_is_compatible(np, "snps,dwmac-3.50a") ||
		of_device_is_compatible(np, "snps,dwmac-3.70a") ||
		of_device_is_compatible(np, "snps,dwmac")) {
		/* Note that the max-frame-size parameter as defined in the
		 * ePAPR v1.1 spec is defined as max-frame-size, it's
		 * actually used as the IEEE definition of MAC Client
		 * data, or MTU. The ePAPR specification is confusing as
		 * the definition is max-frame-size, but usage examples
		 * are clearly MTUs
		 */
		of_property_read_u32(np, "max-frame-size", &plat->maxmtu);
		of_property_read_u32(np, "snps,multicast-filter-bins",
				     &plat->multicast_filter_bins);
		of_property_read_u32(np, "snps,perfect-filter-entries",
				     &plat->unicast_filter_entries);
		plat->unicast_filter_entries = dwmac1000_validate_ucast_entries(
					       plat->unicast_filter_entries);
		plat->multicast_filter_bins = dwmac1000_validate_mcast_bins(
					      plat->multicast_filter_bins);
		plat->has_gmac = 1;
		plat->pmt = 1;
	}

	if (of_device_is_compatible(np, "snps,dwmac-4.00") ||
	    of_device_is_compatible(np, "snps,dwmac-4.10a")) {
		plat->has_gmac4 = 1;
		plat->has_gmac = 0;
		plat->pmt = 1;
		plat->tso_en = of_property_read_bool(np, "snps,tso");
	}

	if (of_device_is_compatible(np, "snps,dwmac-3.610") ||
		of_device_is_compatible(np, "snps,dwmac-3.710")) {
		plat->enh_desc = 1;
		plat->bugged_jumbo = 1;
		plat->force_sf_dma_mode = 1;
	}

	dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*dma_cfg),
			       GFP_KERNEL);
	if (!dma_cfg) {
		stmmac_remove_config_dt(pdev, plat);
		return ERR_PTR(-ENOMEM);
	}
	plat->dma_cfg = dma_cfg;

	of_property_read_u32(np, "snps,pbl", &dma_cfg->pbl);
	if (!dma_cfg->pbl)
		dma_cfg->pbl = DEFAULT_DMA_PBL;
	of_property_read_u32(np, "snps,txpbl", &dma_cfg->txpbl);
	of_property_read_u32(np, "snps,rxpbl", &dma_cfg->rxpbl);
	dma_cfg->pblx8 = !of_property_read_bool(np, "snps,no-pbl-x8");

	dma_cfg->aal = of_property_read_bool(np, "snps,aal");
	dma_cfg->fixed_burst = of_property_read_bool(np, "snps,fixed-burst");
	dma_cfg->mixed_burst = of_property_read_bool(np, "snps,mixed-burst");

	plat->force_thresh_dma_mode = of_property_read_bool(np, "snps,force_thresh_dma_mode");
	if (plat->force_thresh_dma_mode) {
		plat->force_sf_dma_mode = 0;
		pr_warn("force_sf_dma_mode is ignored if force_thresh_dma_mode is set.");
	}

	of_property_read_u32(np, "snps,ps-speed", &plat->mac_port_sel_speed);

	plat->axi = stmmac_axi_setup(pdev);

	stmmac_mtl_setup(pdev, plat);

	/* clock setup */
	plat->stmmac_clk = devm_clk_get(&pdev->dev,
					STMMAC_RESOURCE_NAME);
	if (IS_ERR(plat->stmmac_clk)) {
		dev_warn(&pdev->dev, "Cannot get CSR clock\n");
		plat->stmmac_clk = NULL;
	}
	clk_prepare_enable(plat->stmmac_clk);

	plat->pclk = devm_clk_get(&pdev->dev, "pclk");
	if (IS_ERR(plat->pclk)) {
		if (PTR_ERR(plat->pclk) == -EPROBE_DEFER)
			goto error_pclk_get;

		plat->pclk = NULL;
	}
	clk_prepare_enable(plat->pclk);

	/* Fall-back to main clock in case of no PTP ref is passed */
	plat->clk_ptp_ref = devm_clk_get(&pdev->dev, "ptp_ref");
	if (IS_ERR(plat->clk_ptp_ref)) {
		plat->clk_ptp_rate = clk_get_rate(plat->stmmac_clk);
		plat->clk_ptp_ref = NULL;
		dev_warn(&pdev->dev, "PTP uses main clock\n");
	} else {
		plat->clk_ptp_rate = clk_get_rate(plat->clk_ptp_ref);
		dev_dbg(&pdev->dev, "PTP rate %d\n", plat->clk_ptp_rate);
	}

	plat->stmmac_rst = devm_reset_control_get(&pdev->dev,
						  STMMAC_RESOURCE_NAME);
	if (IS_ERR(plat->stmmac_rst)) {
		if (PTR_ERR(plat->stmmac_rst) == -EPROBE_DEFER)
			goto error_hw_init;

		dev_info(&pdev->dev, "no reset control found\n");
		plat->stmmac_rst = NULL;
	}

	return plat;

error_hw_init:
	clk_disable_unprepare(plat->pclk);
error_pclk_get:
	clk_disable_unprepare(plat->stmmac_clk);

	return ERR_PTR(-EPROBE_DEFER);
}

/**
 * stmmac_remove_config_dt - undo the effects of stmmac_probe_config_dt()
 * @pdev: platform_device structure
 * @plat: driver data platform structure
 *
 * Release resources claimed by stmmac_probe_config_dt().
 */
void stmmac_remove_config_dt(struct platform_device *pdev,
			     struct plat_stmmacenet_data *plat)
{
	struct device_node *np = pdev->dev.of_node;

	if (of_phy_is_fixed_link(np))
		of_phy_deregister_fixed_link(np);
	of_node_put(plat->phy_node);
	of_node_put(plat->mdio_node);
}
#else
struct plat_stmmacenet_data *
stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
{
	return ERR_PTR(-EINVAL);
}

void stmmac_remove_config_dt(struct platform_device *pdev,
			     struct plat_stmmacenet_data *plat)
{
}
#endif /* CONFIG_OF */
EXPORT_SYMBOL_GPL(stmmac_probe_config_dt);
EXPORT_SYMBOL_GPL(stmmac_remove_config_dt);

int stmmac_get_platform_resources(struct platform_device *pdev,
				  struct stmmac_resources *stmmac_res)
{
	struct resource *res;

	memset(stmmac_res, 0, sizeof(*stmmac_res));

	/* Get IRQ information early to have an ability to ask for deferred
	 * probe if needed before we went too far with resource allocation.
	 */
	stmmac_res->irq = platform_get_irq_byname(pdev, "macirq");
	if (stmmac_res->irq < 0) {
		if (stmmac_res->irq != -EPROBE_DEFER) {
			dev_err(&pdev->dev,
				"MAC IRQ configuration information not found\n");
		}
		return stmmac_res->irq;
	}

	/* On some platforms e.g. SPEAr the wake up irq differs from the mac irq
	 * The external wake up irq can be passed through the platform code
	 * named as "eth_wake_irq"
	 *
	 * In case the wake up interrupt is not passed from the platform
	 * so the driver will continue to use the mac irq (ndev->irq)
	 */
	stmmac_res->wol_irq = platform_get_irq_byname(pdev, "eth_wake_irq");
	if (stmmac_res->wol_irq < 0) {
		if (stmmac_res->wol_irq == -EPROBE_DEFER)
			return -EPROBE_DEFER;
		stmmac_res->wol_irq = stmmac_res->irq;
	}

	stmmac_res->lpi_irq = platform_get_irq_byname(pdev, "eth_lpi");
	if (stmmac_res->lpi_irq == -EPROBE_DEFER)
		return -EPROBE_DEFER;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	stmmac_res->addr = devm_ioremap_resource(&pdev->dev, res);

	return PTR_ERR_OR_ZERO(stmmac_res->addr);
}
EXPORT_SYMBOL_GPL(stmmac_get_platform_resources);

/**
 * stmmac_pltfr_remove
 * @pdev: platform device pointer
 * Description: this function calls the main to free the net resources
 * and calls the platforms hook and release the resources (e.g. mem).
 */
int stmmac_pltfr_remove(struct platform_device *pdev)
{
	struct net_device *ndev = platform_get_drvdata(pdev);
	struct stmmac_priv *priv = netdev_priv(ndev);
	struct plat_stmmacenet_data *plat = priv->plat;
	int ret = stmmac_dvr_remove(&pdev->dev);

	if (plat->exit)
		plat->exit(pdev, plat->bsp_priv);

	stmmac_remove_config_dt(pdev, plat);

	return ret;
}
EXPORT_SYMBOL_GPL(stmmac_pltfr_remove);

#ifdef CONFIG_PM_SLEEP
/**
 * stmmac_pltfr_suspend
 * @dev: device pointer
 * Description: this function is invoked when suspend the driver and it direcly
 * call the main suspend function and then, if required, on some platform, it
 * can call an exit helper.
 */
static int stmmac_pltfr_suspend(struct device *dev)
{
	int ret;
	struct net_device *ndev = dev_get_drvdata(dev);
	struct stmmac_priv *priv = netdev_priv(ndev);
	struct platform_device *pdev = to_platform_device(dev);

	ret = stmmac_suspend(dev);
	if (priv->plat->exit)
		priv->plat->exit(pdev, priv->plat->bsp_priv);

	return ret;
}

/**
 * stmmac_pltfr_resume
 * @dev: device pointer
 * Description: this function is invoked when resume the driver before calling
 * the main resume function, on some platforms, it can call own init helper
 * if required.
 */
static int stmmac_pltfr_resume(struct device *dev)
{
	struct net_device *ndev = dev_get_drvdata(dev);
	struct stmmac_priv *priv = netdev_priv(ndev);
	struct platform_device *pdev = to_platform_device(dev);

	if (priv->plat->init)
		priv->plat->init(pdev, priv->plat->bsp_priv);

	return stmmac_resume(dev);
}
#endif /* CONFIG_PM_SLEEP */

SIMPLE_DEV_PM_OPS(stmmac_pltfr_pm_ops, stmmac_pltfr_suspend,
				       stmmac_pltfr_resume);
EXPORT_SYMBOL_GPL(stmmac_pltfr_pm_ops);

MODULE_DESCRIPTION("STMMAC 10/100/1000 Ethernet platform support");
MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud