Training courses

Kernel and Embedded Linux

Bootlin training courses

Embedded Linux, kernel,
Yocto Project, Buildroot, real-time,
graphics, boot time, debugging...

Bootlin logo

Elixir Cross Referencer

  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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Synopsys DWC Ethernet Quality-of-Service v4.10a linux driver
 *
 * Copyright (C) 2016 Joao Pinto <jpinto@synopsys.com>
 */

#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/ethtool.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_net.h>
#include <linux/mfd/syscon.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/stmmac.h>

#include "stmmac_platform.h"
#include "dwmac4.h"

struct tegra_eqos {
	struct device *dev;
	void __iomem *regs;

	struct reset_control *rst;
	struct clk *clk_master;
	struct clk *clk_slave;
	struct clk *clk_tx;
	struct clk *clk_rx;

	struct gpio_desc *reset;
};

static int dwc_eth_dwmac_config_dt(struct platform_device *pdev,
				   struct plat_stmmacenet_data *plat_dat)
{
	struct device_node *np = pdev->dev.of_node;
	u32 burst_map = 0;
	u32 bit_index = 0;
	u32 a_index = 0;

	if (!plat_dat->axi) {
		plat_dat->axi = kzalloc(sizeof(struct stmmac_axi), GFP_KERNEL);

		if (!plat_dat->axi)
			return -ENOMEM;
	}

	plat_dat->axi->axi_lpi_en = of_property_read_bool(np, "snps,en-lpi");
	if (of_property_read_u32(np, "snps,write-requests",
				 &plat_dat->axi->axi_wr_osr_lmt)) {
		/**
		 * Since the register has a reset value of 1, if property
		 * is missing, default to 1.
		 */
		plat_dat->axi->axi_wr_osr_lmt = 1;
	} else {
		/**
		 * If property exists, to keep the behavior from dwc_eth_qos,
		 * subtract one after parsing.
		 */
		plat_dat->axi->axi_wr_osr_lmt--;
	}

	if (of_property_read_u32(np, "snps,read-requests",
				 &plat_dat->axi->axi_rd_osr_lmt)) {
		/**
		 * Since the register has a reset value of 1, if property
		 * is missing, default to 1.
		 */
		plat_dat->axi->axi_rd_osr_lmt = 1;
	} else {
		/**
		 * If property exists, to keep the behavior from dwc_eth_qos,
		 * subtract one after parsing.
		 */
		plat_dat->axi->axi_rd_osr_lmt--;
	}
	of_property_read_u32(np, "snps,burst-map", &burst_map);

	/* converts burst-map bitmask to burst array */
	for (bit_index = 0; bit_index < 7; bit_index++) {
		if (burst_map & (1 << bit_index)) {
			switch (bit_index) {
			case 0:
			plat_dat->axi->axi_blen[a_index] = 4; break;
			case 1:
			plat_dat->axi->axi_blen[a_index] = 8; break;
			case 2:
			plat_dat->axi->axi_blen[a_index] = 16; break;
			case 3:
			plat_dat->axi->axi_blen[a_index] = 32; break;
			case 4:
			plat_dat->axi->axi_blen[a_index] = 64; break;
			case 5:
			plat_dat->axi->axi_blen[a_index] = 128; break;
			case 6:
			plat_dat->axi->axi_blen[a_index] = 256; break;
			default:
			break;
			}
			a_index++;
		}
	}

	/* dwc-qos needs GMAC4, AAL, TSO and PMT */
	plat_dat->has_gmac4 = 1;
	plat_dat->dma_cfg->aal = 1;
	plat_dat->tso_en = 1;
	plat_dat->pmt = 1;

	return 0;
}

static void *dwc_qos_probe(struct platform_device *pdev,
			   struct plat_stmmacenet_data *plat_dat,
			   struct stmmac_resources *stmmac_res)
{
	int err;

	plat_dat->stmmac_clk = devm_clk_get(&pdev->dev, "apb_pclk");
	if (IS_ERR(plat_dat->stmmac_clk)) {
		dev_err(&pdev->dev, "apb_pclk clock not found.\n");
		return ERR_CAST(plat_dat->stmmac_clk);
	}

	err = clk_prepare_enable(plat_dat->stmmac_clk);
	if (err < 0) {
		dev_err(&pdev->dev, "failed to enable apb_pclk clock: %d\n",
			err);
		return ERR_PTR(err);
	}

	plat_dat->pclk = devm_clk_get(&pdev->dev, "phy_ref_clk");
	if (IS_ERR(plat_dat->pclk)) {
		dev_err(&pdev->dev, "phy_ref_clk clock not found.\n");
		err = PTR_ERR(plat_dat->pclk);
		goto disable;
	}

	err = clk_prepare_enable(plat_dat->pclk);
	if (err < 0) {
		dev_err(&pdev->dev, "failed to enable phy_ref clock: %d\n",
			err);
		goto disable;
	}

	return NULL;

disable:
	clk_disable_unprepare(plat_dat->stmmac_clk);
	return ERR_PTR(err);
}

static int dwc_qos_remove(struct platform_device *pdev)
{
	struct net_device *ndev = platform_get_drvdata(pdev);
	struct stmmac_priv *priv = netdev_priv(ndev);

	clk_disable_unprepare(priv->plat->pclk);
	clk_disable_unprepare(priv->plat->stmmac_clk);

	return 0;
}

#define SDMEMCOMPPADCTRL 0x8800
#define  SDMEMCOMPPADCTRL_PAD_E_INPUT_OR_E_PWRD BIT(31)

#define AUTO_CAL_CONFIG 0x8804
#define  AUTO_CAL_CONFIG_START BIT(31)
#define  AUTO_CAL_CONFIG_ENABLE BIT(29)

#define AUTO_CAL_STATUS 0x880c
#define  AUTO_CAL_STATUS_ACTIVE BIT(31)

static void tegra_eqos_fix_speed(void *priv, unsigned int speed)
{
	struct tegra_eqos *eqos = priv;
	unsigned long rate = 125000000;
	bool needs_calibration = false;
	u32 value;
	int err;

	switch (speed) {
	case SPEED_1000:
		needs_calibration = true;
		rate = 125000000;
		break;

	case SPEED_100:
		needs_calibration = true;
		rate = 25000000;
		break;

	case SPEED_10:
		rate = 2500000;
		break;

	default:
		dev_err(eqos->dev, "invalid speed %u\n", speed);
		break;
	}

	if (needs_calibration) {
		/* calibrate */
		value = readl(eqos->regs + SDMEMCOMPPADCTRL);
		value |= SDMEMCOMPPADCTRL_PAD_E_INPUT_OR_E_PWRD;
		writel(value, eqos->regs + SDMEMCOMPPADCTRL);

		udelay(1);

		value = readl(eqos->regs + AUTO_CAL_CONFIG);
		value |= AUTO_CAL_CONFIG_START | AUTO_CAL_CONFIG_ENABLE;
		writel(value, eqos->regs + AUTO_CAL_CONFIG);

		err = readl_poll_timeout_atomic(eqos->regs + AUTO_CAL_STATUS,
						value,
						value & AUTO_CAL_STATUS_ACTIVE,
						1, 10);
		if (err < 0) {
			dev_err(eqos->dev, "calibration did not start\n");
			goto failed;
		}

		err = readl_poll_timeout_atomic(eqos->regs + AUTO_CAL_STATUS,
						value,
						(value & AUTO_CAL_STATUS_ACTIVE) == 0,
						20, 200);
		if (err < 0) {
			dev_err(eqos->dev, "calibration didn't finish\n");
			goto failed;
		}

	failed:
		value = readl(eqos->regs + SDMEMCOMPPADCTRL);
		value &= ~SDMEMCOMPPADCTRL_PAD_E_INPUT_OR_E_PWRD;
		writel(value, eqos->regs + SDMEMCOMPPADCTRL);
	} else {
		value = readl(eqos->regs + AUTO_CAL_CONFIG);
		value &= ~AUTO_CAL_CONFIG_ENABLE;
		writel(value, eqos->regs + AUTO_CAL_CONFIG);
	}

	err = clk_set_rate(eqos->clk_tx, rate);
	if (err < 0)
		dev_err(eqos->dev, "failed to set TX rate: %d\n", err);
}

static int tegra_eqos_init(struct platform_device *pdev, void *priv)
{
	struct tegra_eqos *eqos = priv;
	unsigned long rate;
	u32 value;

	rate = clk_get_rate(eqos->clk_slave);

	value = (rate / 1000000) - 1;
	writel(value, eqos->regs + GMAC_1US_TIC_COUNTER);

	return 0;
}

static void *tegra_eqos_probe(struct platform_device *pdev,
			      struct plat_stmmacenet_data *data,
			      struct stmmac_resources *res)
{
	struct tegra_eqos *eqos;
	int err;

	eqos = devm_kzalloc(&pdev->dev, sizeof(*eqos), GFP_KERNEL);
	if (!eqos) {
		err = -ENOMEM;
		goto error;
	}

	eqos->dev = &pdev->dev;
	eqos->regs = res->addr;

	eqos->clk_master = devm_clk_get(&pdev->dev, "master_bus");
	if (IS_ERR(eqos->clk_master)) {
		err = PTR_ERR(eqos->clk_master);
		goto error;
	}

	err = clk_prepare_enable(eqos->clk_master);
	if (err < 0)
		goto error;

	eqos->clk_slave = devm_clk_get(&pdev->dev, "slave_bus");
	if (IS_ERR(eqos->clk_slave)) {
		err = PTR_ERR(eqos->clk_slave);
		goto disable_master;
	}

	data->stmmac_clk = eqos->clk_slave;

	err = clk_prepare_enable(eqos->clk_slave);
	if (err < 0)
		goto disable_master;

	eqos->clk_rx = devm_clk_get(&pdev->dev, "rx");
	if (IS_ERR(eqos->clk_rx)) {
		err = PTR_ERR(eqos->clk_rx);
		goto disable_slave;
	}

	err = clk_prepare_enable(eqos->clk_rx);
	if (err < 0)
		goto disable_slave;

	eqos->clk_tx = devm_clk_get(&pdev->dev, "tx");
	if (IS_ERR(eqos->clk_tx)) {
		err = PTR_ERR(eqos->clk_tx);
		goto disable_rx;
	}

	err = clk_prepare_enable(eqos->clk_tx);
	if (err < 0)
		goto disable_rx;

	eqos->reset = devm_gpiod_get(&pdev->dev, "phy-reset", GPIOD_OUT_HIGH);
	if (IS_ERR(eqos->reset)) {
		err = PTR_ERR(eqos->reset);
		goto disable_tx;
	}

	usleep_range(2000, 4000);
	gpiod_set_value(eqos->reset, 0);

	/* MDIO bus was already reset just above */
	data->mdio_bus_data->needs_reset = false;

	eqos->rst = devm_reset_control_get(&pdev->dev, "eqos");
	if (IS_ERR(eqos->rst)) {
		err = PTR_ERR(eqos->rst);
		goto reset_phy;
	}

	err = reset_control_assert(eqos->rst);
	if (err < 0)
		goto reset_phy;

	usleep_range(2000, 4000);

	err = reset_control_deassert(eqos->rst);
	if (err < 0)
		goto reset_phy;

	usleep_range(2000, 4000);

	data->fix_mac_speed = tegra_eqos_fix_speed;
	data->init = tegra_eqos_init;
	data->bsp_priv = eqos;

	err = tegra_eqos_init(pdev, eqos);
	if (err < 0)
		goto reset;

out:
	return eqos;

reset:
	reset_control_assert(eqos->rst);
reset_phy:
	gpiod_set_value(eqos->reset, 1);
disable_tx:
	clk_disable_unprepare(eqos->clk_tx);
disable_rx:
	clk_disable_unprepare(eqos->clk_rx);
disable_slave:
	clk_disable_unprepare(eqos->clk_slave);
disable_master:
	clk_disable_unprepare(eqos->clk_master);
error:
	eqos = ERR_PTR(err);
	goto out;
}

static int tegra_eqos_remove(struct platform_device *pdev)
{
	struct tegra_eqos *eqos = get_stmmac_bsp_priv(&pdev->dev);

	reset_control_assert(eqos->rst);
	gpiod_set_value(eqos->reset, 1);
	clk_disable_unprepare(eqos->clk_tx);
	clk_disable_unprepare(eqos->clk_rx);
	clk_disable_unprepare(eqos->clk_slave);
	clk_disable_unprepare(eqos->clk_master);

	return 0;
}

struct dwc_eth_dwmac_data {
	void *(*probe)(struct platform_device *pdev,
		       struct plat_stmmacenet_data *data,
		       struct stmmac_resources *res);
	int (*remove)(struct platform_device *pdev);
};

static const struct dwc_eth_dwmac_data dwc_qos_data = {
	.probe = dwc_qos_probe,
	.remove = dwc_qos_remove,
};

static const struct dwc_eth_dwmac_data tegra_eqos_data = {
	.probe = tegra_eqos_probe,
	.remove = tegra_eqos_remove,
};

static int dwc_eth_dwmac_probe(struct platform_device *pdev)
{
	const struct dwc_eth_dwmac_data *data;
	struct plat_stmmacenet_data *plat_dat;
	struct stmmac_resources stmmac_res;
	void *priv;
	int ret;

	data = of_device_get_match_data(&pdev->dev);

	memset(&stmmac_res, 0, sizeof(struct stmmac_resources));

	/**
	 * Since stmmac_platform supports name IRQ only, basic platform
	 * resource initialization is done in the glue logic.
	 */
	stmmac_res.irq = platform_get_irq(pdev, 0);
	if (stmmac_res.irq < 0)
		return stmmac_res.irq;
	stmmac_res.wol_irq = stmmac_res.irq;

	stmmac_res.addr = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(stmmac_res.addr))
		return PTR_ERR(stmmac_res.addr);

	plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
	if (IS_ERR(plat_dat))
		return PTR_ERR(plat_dat);

	priv = data->probe(pdev, plat_dat, &stmmac_res);
	if (IS_ERR(priv)) {
		ret = PTR_ERR(priv);

		if (ret != -EPROBE_DEFER)
			dev_err(&pdev->dev, "failed to probe subdriver: %d\n",
				ret);

		goto remove_config;
	}

	ret = dwc_eth_dwmac_config_dt(pdev, plat_dat);
	if (ret)
		goto remove;

	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
	if (ret)
		goto remove;

	return ret;

remove:
	data->remove(pdev);
remove_config:
	stmmac_remove_config_dt(pdev, plat_dat);

	return ret;
}

static int dwc_eth_dwmac_remove(struct platform_device *pdev)
{
	struct net_device *ndev = platform_get_drvdata(pdev);
	struct stmmac_priv *priv = netdev_priv(ndev);
	const struct dwc_eth_dwmac_data *data;
	int err;

	data = of_device_get_match_data(&pdev->dev);

	err = stmmac_dvr_remove(&pdev->dev);
	if (err < 0)
		dev_err(&pdev->dev, "failed to remove platform: %d\n", err);

	err = data->remove(pdev);
	if (err < 0)
		dev_err(&pdev->dev, "failed to remove subdriver: %d\n", err);

	stmmac_remove_config_dt(pdev, priv->plat);

	return err;
}

static const struct of_device_id dwc_eth_dwmac_match[] = {
	{ .compatible = "snps,dwc-qos-ethernet-4.10", .data = &dwc_qos_data },
	{ .compatible = "nvidia,tegra186-eqos", .data = &tegra_eqos_data },
	{ }
};
MODULE_DEVICE_TABLE(of, dwc_eth_dwmac_match);

static struct platform_driver dwc_eth_dwmac_driver = {
	.probe  = dwc_eth_dwmac_probe,
	.remove = dwc_eth_dwmac_remove,
	.driver = {
		.name           = "dwc-eth-dwmac",
		.pm             = &stmmac_pltfr_pm_ops,
		.of_match_table = dwc_eth_dwmac_match,
	},
};
module_platform_driver(dwc_eth_dwmac_driver);

MODULE_AUTHOR("Joao Pinto <jpinto@synopsys.com>");
MODULE_DESCRIPTION("Synopsys DWC Ethernet Quality-of-Service v4.10a driver");
MODULE_LICENSE("GPL v2");