summaryrefslogtreecommitdiff
path: root/drivers/phy/ti/phy-gmii-sel.c
blob: a52c5bb350333ec14951c32b11f741dd9287db80 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Texas Instruments CPSW Port's PHY Interface Mode selection Driver
 *
 * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
 *
 * Based on cpsw-phy-sel.c driver created by Mugunthan V N <mugunthanvnm@ti.com>
 */

#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/of_net.h>
#include <linux/phy.h>
#include <linux/phy/phy.h>
#include <linux/regmap.h>

/* AM33xx SoC specific definitions for the CONTROL port */
#define AM33XX_GMII_SEL_MODE_MII	0
#define AM33XX_GMII_SEL_MODE_RMII	1
#define AM33XX_GMII_SEL_MODE_RGMII	2

enum {
	PHY_GMII_SEL_PORT_MODE,
	PHY_GMII_SEL_RGMII_ID_MODE,
	PHY_GMII_SEL_RMII_IO_CLK_EN,
	PHY_GMII_SEL_LAST,
};

struct phy_gmii_sel_phy_priv {
	struct phy_gmii_sel_priv *priv;
	u32		id;
	struct phy	*if_phy;
	int		rmii_clock_external;
	int		phy_if_mode;
	struct regmap_field *fields[PHY_GMII_SEL_LAST];
};

struct phy_gmii_sel_soc_data {
	u32 num_ports;
	u32 features;
	const struct reg_field (*regfields)[PHY_GMII_SEL_LAST];
};

struct phy_gmii_sel_priv {
	struct device *dev;
	const struct phy_gmii_sel_soc_data *soc_data;
	struct regmap *regmap;
	struct phy_provider *phy_provider;
	struct phy_gmii_sel_phy_priv *if_phys;
};

static int phy_gmii_sel_mode(struct phy *phy, enum phy_mode mode, int submode)
{
	struct phy_gmii_sel_phy_priv *if_phy = phy_get_drvdata(phy);
	const struct phy_gmii_sel_soc_data *soc_data = if_phy->priv->soc_data;
	struct device *dev = if_phy->priv->dev;
	struct regmap_field *regfield;
	int ret, rgmii_id = 0;
	u32 gmii_sel_mode = 0;

	if (mode != PHY_MODE_ETHERNET)
		return -EINVAL;

	switch (submode) {
	case PHY_INTERFACE_MODE_RMII:
		gmii_sel_mode = AM33XX_GMII_SEL_MODE_RMII;
		break;

	case PHY_INTERFACE_MODE_RGMII:
		gmii_sel_mode = AM33XX_GMII_SEL_MODE_RGMII;
		break;

	case PHY_INTERFACE_MODE_RGMII_ID:
	case PHY_INTERFACE_MODE_RGMII_RXID:
	case PHY_INTERFACE_MODE_RGMII_TXID:
		gmii_sel_mode = AM33XX_GMII_SEL_MODE_RGMII;
		rgmii_id = 1;
		break;

	case PHY_INTERFACE_MODE_MII:
		mode = AM33XX_GMII_SEL_MODE_MII;
		break;

	default:
		dev_warn(dev,
			 "port%u: unsupported mode: \"%s\". Defaulting to MII.\n",
			 if_phy->id, phy_modes(rgmii_id));
		return -EINVAL;
	}

	if_phy->phy_if_mode = submode;

	dev_dbg(dev, "%s id:%u mode:%u rgmii_id:%d rmii_clk_ext:%d\n",
		__func__, if_phy->id, mode, rgmii_id,
		if_phy->rmii_clock_external);

	regfield = if_phy->fields[PHY_GMII_SEL_PORT_MODE];
	ret = regmap_field_write(regfield, gmii_sel_mode);
	if (ret) {
		dev_err(dev, "port%u: set mode fail %d", if_phy->id, ret);
		return ret;
	}

	if (soc_data->features & BIT(PHY_GMII_SEL_RGMII_ID_MODE) &&
	    if_phy->fields[PHY_GMII_SEL_RGMII_ID_MODE]) {
		regfield = if_phy->fields[PHY_GMII_SEL_RGMII_ID_MODE];
		ret = regmap_field_write(regfield, rgmii_id);
		if (ret)
			return ret;
	}

	if (soc_data->features & BIT(PHY_GMII_SEL_RMII_IO_CLK_EN) &&
	    if_phy->fields[PHY_GMII_SEL_RMII_IO_CLK_EN]) {
		regfield = if_phy->fields[PHY_GMII_SEL_RMII_IO_CLK_EN];
		ret = regmap_field_write(regfield,
					 if_phy->rmii_clock_external);
	}

	return 0;
}

static const
struct reg_field phy_gmii_sel_fields_am33xx[][PHY_GMII_SEL_LAST] = {
	{
		[PHY_GMII_SEL_PORT_MODE] = REG_FIELD(0x650, 0, 1),
		[PHY_GMII_SEL_RGMII_ID_MODE] = REG_FIELD(0x650, 4, 4),
		[PHY_GMII_SEL_RMII_IO_CLK_EN] = REG_FIELD(0x650, 6, 6),
	},
	{
		[PHY_GMII_SEL_PORT_MODE] = REG_FIELD(0x650, 2, 3),
		[PHY_GMII_SEL_RGMII_ID_MODE] = REG_FIELD(0x650, 5, 5),
		[PHY_GMII_SEL_RMII_IO_CLK_EN] = REG_FIELD(0x650, 7, 7),
	},
};

static const
struct phy_gmii_sel_soc_data phy_gmii_sel_soc_am33xx = {
	.num_ports = 2,
	.features = BIT(PHY_GMII_SEL_RGMII_ID_MODE) |
		    BIT(PHY_GMII_SEL_RMII_IO_CLK_EN),
	.regfields = phy_gmii_sel_fields_am33xx,
};

static const
struct reg_field phy_gmii_sel_fields_dra7[][PHY_GMII_SEL_LAST] = {
	{
		[PHY_GMII_SEL_PORT_MODE] = REG_FIELD(0x554, 0, 1),
		[PHY_GMII_SEL_RGMII_ID_MODE] = REG_FIELD((~0), 0, 0),
		[PHY_GMII_SEL_RMII_IO_CLK_EN] = REG_FIELD((~0), 0, 0),
	},
	{
		[PHY_GMII_SEL_PORT_MODE] = REG_FIELD(0x554, 4, 5),
		[PHY_GMII_SEL_RGMII_ID_MODE] = REG_FIELD((~0), 0, 0),
		[PHY_GMII_SEL_RMII_IO_CLK_EN] = REG_FIELD((~0), 0, 0),
	},
};

static const
struct phy_gmii_sel_soc_data phy_gmii_sel_soc_dra7 = {
	.num_ports = 2,
	.regfields = phy_gmii_sel_fields_dra7,
};

static const
struct phy_gmii_sel_soc_data phy_gmii_sel_soc_dm814 = {
	.num_ports = 2,
	.features = BIT(PHY_GMII_SEL_RGMII_ID_MODE),
	.regfields = phy_gmii_sel_fields_am33xx,
};

static const struct of_device_id phy_gmii_sel_id_table[] = {
	{
		.compatible	= "ti,am3352-phy-gmii-sel",
		.data		= &phy_gmii_sel_soc_am33xx,
	},
	{
		.compatible	= "ti,dra7xx-phy-gmii-sel",
		.data		= &phy_gmii_sel_soc_dra7,
	},
	{
		.compatible	= "ti,am43xx-phy-gmii-sel",
		.data		= &phy_gmii_sel_soc_am33xx,
	},
	{
		.compatible	= "ti,dm814-phy-gmii-sel",
		.data		= &phy_gmii_sel_soc_dm814,
	},
	{}
};
MODULE_DEVICE_TABLE(of, phy_gmii_sel_id_table);

static const struct phy_ops phy_gmii_sel_ops = {
	.set_mode	= phy_gmii_sel_mode,
	.owner		= THIS_MODULE,
};

static struct phy *phy_gmii_sel_of_xlate(struct device *dev,
					 struct of_phandle_args *args)
{
	struct phy_gmii_sel_priv *priv = dev_get_drvdata(dev);
	int phy_id = args->args[0];

	if (args->args_count < 1)
		return ERR_PTR(-EINVAL);
	if (!priv || !priv->if_phys)
		return ERR_PTR(-ENODEV);
	if (priv->soc_data->features & BIT(PHY_GMII_SEL_RMII_IO_CLK_EN) &&
	    args->args_count < 2)
		return ERR_PTR(-EINVAL);
	if (phy_id > priv->soc_data->num_ports)
		return ERR_PTR(-EINVAL);
	if (phy_id != priv->if_phys[phy_id - 1].id)
		return ERR_PTR(-EINVAL);

	phy_id--;
	if (priv->soc_data->features & BIT(PHY_GMII_SEL_RMII_IO_CLK_EN))
		priv->if_phys[phy_id].rmii_clock_external = args->args[1];
	dev_dbg(dev, "%s id:%u ext:%d\n", __func__,
		priv->if_phys[phy_id].id, args->args[1]);

	return priv->if_phys[phy_id].if_phy;
}

static int phy_gmii_sel_init_ports(struct phy_gmii_sel_priv *priv)
{
	const struct phy_gmii_sel_soc_data *soc_data = priv->soc_data;
	struct device *dev = priv->dev;
	struct phy_gmii_sel_phy_priv *if_phys;
	int i, num_ports, ret;

	num_ports = priv->soc_data->num_ports;

	if_phys = devm_kcalloc(priv->dev, num_ports,
			       sizeof(*if_phys), GFP_KERNEL);
	if (!if_phys)
		return -ENOMEM;
	dev_dbg(dev, "%s %d\n", __func__, num_ports);

	for (i = 0; i < num_ports; i++) {
		const struct reg_field *field;
		struct regmap_field *regfield;

		if_phys[i].id = i + 1;
		if_phys[i].priv = priv;

		field = &soc_data->regfields[i][PHY_GMII_SEL_PORT_MODE];
		dev_dbg(dev, "%s field %x %d %d\n", __func__,
			field->reg, field->msb, field->lsb);

		regfield = devm_regmap_field_alloc(dev, priv->regmap, *field);
		if (IS_ERR(regfield))
			return PTR_ERR(regfield);
		if_phys[i].fields[PHY_GMII_SEL_PORT_MODE] = regfield;

		field = &soc_data->regfields[i][PHY_GMII_SEL_RGMII_ID_MODE];
		if (field->reg != (~0)) {
			regfield = devm_regmap_field_alloc(dev,
							   priv->regmap,
							   *field);
			if (IS_ERR(regfield))
				return PTR_ERR(regfield);
			if_phys[i].fields[PHY_GMII_SEL_RGMII_ID_MODE] =
				regfield;
		}

		field = &soc_data->regfields[i][PHY_GMII_SEL_RMII_IO_CLK_EN];
		if (field->reg != (~0)) {
			regfield = devm_regmap_field_alloc(dev,
							   priv->regmap,
							   *field);
			if (IS_ERR(regfield))
				return PTR_ERR(regfield);
			if_phys[i].fields[PHY_GMII_SEL_RMII_IO_CLK_EN] =
				regfield;
		}

		if_phys[i].if_phy = devm_phy_create(dev,
						    priv->dev->of_node,
						    &phy_gmii_sel_ops);
		if (IS_ERR(if_phys[i].if_phy)) {
			ret = PTR_ERR(if_phys[i].if_phy);
			dev_err(dev, "Failed to create phy%d %d\n", i, ret);
			return ret;
		}
		phy_set_drvdata(if_phys[i].if_phy, &if_phys[i]);
	}

	priv->if_phys = if_phys;
	return 0;
}

static int phy_gmii_sel_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *node = dev->of_node;
	const struct of_device_id *of_id;
	struct phy_gmii_sel_priv *priv;
	int ret;

	of_id = of_match_node(phy_gmii_sel_id_table, pdev->dev.of_node);
	if (!of_id)
		return -EINVAL;

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

	priv->dev = &pdev->dev;
	priv->soc_data = of_id->data;

	priv->regmap = syscon_node_to_regmap(node->parent);
	if (IS_ERR(priv->regmap)) {
		ret = PTR_ERR(priv->regmap);
		dev_err(dev, "Failed to get syscon %d\n", ret);
		return ret;
	}

	ret = phy_gmii_sel_init_ports(priv);
	if (ret)
		return ret;

	dev_set_drvdata(&pdev->dev, priv);

	priv->phy_provider =
		devm_of_phy_provider_register(dev,
					      phy_gmii_sel_of_xlate);
	if (IS_ERR(priv->phy_provider)) {
		ret = PTR_ERR(priv->phy_provider);
		dev_err(dev, "Failed to create phy provider %d\n", ret);
		return ret;
	}

	return 0;
}

static struct platform_driver phy_gmii_sel_driver = {
	.probe		= phy_gmii_sel_probe,
	.driver		= {
		.name	= "phy-gmii-sel",
		.of_match_table = phy_gmii_sel_id_table,
	},
};
module_platform_driver(phy_gmii_sel_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Grygorii Strashko <grygorii.strashko@ti.com>");
MODULE_DESCRIPTION("TI CPSW Port's PHY Interface Mode selection Driver");