summaryrefslogtreecommitdiffstats
path: root/drivers/net/dsa/realtek/realtek-mdio.c
blob: 292e6d087e8b995f56eca69c41f1fdca83a572af (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
// SPDX-License-Identifier: GPL-2.0+
/* Realtek MDIO interface driver
 *
 * ASICs we intend to support with this driver:
 *
 * RTL8366   - The original version, apparently
 * RTL8369   - Similar enough to have the same datsheet as RTL8366
 * RTL8366RB - Probably reads out "RTL8366 revision B", has a quite
 *             different register layout from the other two
 * RTL8366S  - Is this "RTL8366 super"?
 * RTL8367   - Has an OpenWRT driver as well
 * RTL8368S  - Seems to be an alternative name for RTL8366RB
 * RTL8370   - Also uses SMI
 *
 * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
 * Copyright (C) 2010 Antti Seppälä <a.seppala@gmail.com>
 * Copyright (C) 2010 Roman Yeryomin <roman@advem.lv>
 * Copyright (C) 2011 Colin Leitner <colin.leitner@googlemail.com>
 * Copyright (C) 2009-2010 Gabor Juhos <juhosg@openwrt.org>
 */

#include <linux/module.h>
#include <linux/of.h>
#include <linux/overflow.h>
#include <linux/regmap.h>

#include "realtek.h"

/* Read/write via mdiobus */
#define REALTEK_MDIO_CTRL0_REG		31
#define REALTEK_MDIO_START_REG		29
#define REALTEK_MDIO_CTRL1_REG		21
#define REALTEK_MDIO_ADDRESS_REG	23
#define REALTEK_MDIO_DATA_WRITE_REG	24
#define REALTEK_MDIO_DATA_READ_REG	25

#define REALTEK_MDIO_START_OP		0xFFFF
#define REALTEK_MDIO_ADDR_OP		0x000E
#define REALTEK_MDIO_READ_OP		0x0001
#define REALTEK_MDIO_WRITE_OP		0x0003

static int realtek_mdio_write(void *ctx, u32 reg, u32 val)
{
	struct realtek_priv *priv = ctx;
	struct mii_bus *bus = priv->bus;
	int ret;

	mutex_lock(&bus->mdio_lock);

	ret = bus->write(bus, priv->mdio_addr, REALTEK_MDIO_CTRL0_REG, REALTEK_MDIO_ADDR_OP);
	if (ret)
		goto out_unlock;

	ret = bus->write(bus, priv->mdio_addr, REALTEK_MDIO_ADDRESS_REG, reg);
	if (ret)
		goto out_unlock;

	ret = bus->write(bus, priv->mdio_addr, REALTEK_MDIO_DATA_WRITE_REG, val);
	if (ret)
		goto out_unlock;

	ret = bus->write(bus, priv->mdio_addr, REALTEK_MDIO_CTRL1_REG, REALTEK_MDIO_WRITE_OP);

out_unlock:
	mutex_unlock(&bus->mdio_lock);

	return ret;
}

static int realtek_mdio_read(void *ctx, u32 reg, u32 *val)
{
	struct realtek_priv *priv = ctx;
	struct mii_bus *bus = priv->bus;
	int ret;

	mutex_lock(&bus->mdio_lock);

	ret = bus->write(bus, priv->mdio_addr, REALTEK_MDIO_CTRL0_REG, REALTEK_MDIO_ADDR_OP);
	if (ret)
		goto out_unlock;

	ret = bus->write(bus, priv->mdio_addr, REALTEK_MDIO_ADDRESS_REG, reg);
	if (ret)
		goto out_unlock;

	ret = bus->write(bus, priv->mdio_addr, REALTEK_MDIO_CTRL1_REG, REALTEK_MDIO_READ_OP);
	if (ret)
		goto out_unlock;

	ret = bus->read(bus, priv->mdio_addr, REALTEK_MDIO_DATA_READ_REG);
	if (ret >= 0) {
		*val = ret;
		ret = 0;
	}

out_unlock:
	mutex_unlock(&bus->mdio_lock);

	return ret;
}

static void realtek_mdio_lock(void *ctx)
{
	struct realtek_priv *priv = ctx;

	mutex_lock(&priv->map_lock);
}

static void realtek_mdio_unlock(void *ctx)
{
	struct realtek_priv *priv = ctx;

	mutex_unlock(&priv->map_lock);
}

static const struct regmap_config realtek_mdio_regmap_config = {
	.reg_bits = 10, /* A4..A0 R4..R0 */
	.val_bits = 16,
	.reg_stride = 1,
	/* PHY regs are at 0x8000 */
	.max_register = 0xffff,
	.reg_format_endian = REGMAP_ENDIAN_BIG,
	.reg_read = realtek_mdio_read,
	.reg_write = realtek_mdio_write,
	.cache_type = REGCACHE_NONE,
	.lock = realtek_mdio_lock,
	.unlock = realtek_mdio_unlock,
};

static const struct regmap_config realtek_mdio_nolock_regmap_config = {
	.reg_bits = 10, /* A4..A0 R4..R0 */
	.val_bits = 16,
	.reg_stride = 1,
	/* PHY regs are at 0x8000 */
	.max_register = 0xffff,
	.reg_format_endian = REGMAP_ENDIAN_BIG,
	.reg_read = realtek_mdio_read,
	.reg_write = realtek_mdio_write,
	.cache_type = REGCACHE_NONE,
	.disable_locking = true,
};

static int realtek_mdio_probe(struct mdio_device *mdiodev)
{
	struct realtek_priv *priv;
	struct device *dev = &mdiodev->dev;
	const struct realtek_variant *var;
	struct regmap_config rc;
	struct device_node *np;
	int ret;

	var = of_device_get_match_data(dev);
	if (!var)
		return -EINVAL;

	priv = devm_kzalloc(&mdiodev->dev,
			    size_add(sizeof(*priv), var->chip_data_sz),
			    GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	mutex_init(&priv->map_lock);

	rc = realtek_mdio_regmap_config;
	rc.lock_arg = priv;
	priv->map = devm_regmap_init(dev, NULL, priv, &rc);
	if (IS_ERR(priv->map)) {
		ret = PTR_ERR(priv->map);
		dev_err(dev, "regmap init failed: %d\n", ret);
		return ret;
	}

	rc = realtek_mdio_nolock_regmap_config;
	priv->map_nolock = devm_regmap_init(dev, NULL, priv, &rc);
	if (IS_ERR(priv->map_nolock)) {
		ret = PTR_ERR(priv->map_nolock);
		dev_err(dev, "regmap init failed: %d\n", ret);
		return ret;
	}

	priv->mdio_addr = mdiodev->addr;
	priv->bus = mdiodev->bus;
	priv->dev = &mdiodev->dev;
	priv->chip_data = (void *)priv + sizeof(*priv);

	priv->clk_delay = var->clk_delay;
	priv->cmd_read = var->cmd_read;
	priv->cmd_write = var->cmd_write;
	priv->ops = var->ops;

	priv->write_reg_noack = realtek_mdio_write;

	np = dev->of_node;

	dev_set_drvdata(dev, priv);

	/* TODO: if power is software controlled, set up any regulators here */
	priv->leds_disabled = of_property_read_bool(np, "realtek,disable-leds");

	priv->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
	if (IS_ERR(priv->reset)) {
		dev_err(dev, "failed to get RESET GPIO\n");
		return PTR_ERR(priv->reset);
	}

	if (priv->reset) {
		gpiod_set_value(priv->reset, 1);
		dev_dbg(dev, "asserted RESET\n");
		msleep(REALTEK_HW_STOP_DELAY);
		gpiod_set_value(priv->reset, 0);
		msleep(REALTEK_HW_START_DELAY);
		dev_dbg(dev, "deasserted RESET\n");
	}

	ret = priv->ops->detect(priv);
	if (ret) {
		dev_err(dev, "unable to detect switch\n");
		return ret;
	}

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

	priv->ds->dev = dev;
	priv->ds->num_ports = priv->num_ports;
	priv->ds->priv = priv;
	priv->ds->ops = var->ds_ops_mdio;

	ret = dsa_register_switch(priv->ds);
	if (ret) {
		dev_err(priv->dev, "unable to register switch ret = %d\n", ret);
		return ret;
	}

	return 0;
}

static void realtek_mdio_remove(struct mdio_device *mdiodev)
{
	struct realtek_priv *priv = dev_get_drvdata(&mdiodev->dev);

	if (!priv)
		return;

	dsa_unregister_switch(priv->ds);

	/* leave the device reset asserted */
	if (priv->reset)
		gpiod_set_value(priv->reset, 1);
}

static void realtek_mdio_shutdown(struct mdio_device *mdiodev)
{
	struct realtek_priv *priv = dev_get_drvdata(&mdiodev->dev);

	if (!priv)
		return;

	dsa_switch_shutdown(priv->ds);

	dev_set_drvdata(&mdiodev->dev, NULL);
}

static const struct of_device_id realtek_mdio_of_match[] = {
#if IS_ENABLED(CONFIG_NET_DSA_REALTEK_RTL8366RB)
	{ .compatible = "realtek,rtl8366rb", .data = &rtl8366rb_variant, },
#endif
#if IS_ENABLED(CONFIG_NET_DSA_REALTEK_RTL8365MB)
	{ .compatible = "realtek,rtl8365mb", .data = &rtl8365mb_variant, },
#endif
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, realtek_mdio_of_match);

static struct mdio_driver realtek_mdio_driver = {
	.mdiodrv.driver = {
		.name = "realtek-mdio",
		.of_match_table = realtek_mdio_of_match,
	},
	.probe  = realtek_mdio_probe,
	.remove = realtek_mdio_remove,
	.shutdown = realtek_mdio_shutdown,
};

mdio_module_driver(realtek_mdio_driver);

MODULE_AUTHOR("Luiz Angelo Daros de Luca <luizluca@gmail.com>");
MODULE_DESCRIPTION("Driver for Realtek ethernet switch connected via MDIO interface");
MODULE_LICENSE("GPL");