1// SPDX-License-Identifier: GPL-2.0
2/*
3 * phy-uniphier-usb2.c - PHY driver for UniPhier USB2 controller
4 * Copyright 2015-2018 Socionext Inc.
5 * Author:
6 *      Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
7 */
8
9#include <linux/mfd/syscon.h>
10#include <linux/module.h>
11#include <linux/of.h>
12#include <linux/of_platform.h>
13#include <linux/phy/phy.h>
14#include <linux/platform_device.h>
15#include <linux/regmap.h>
16#include <linux/regulator/consumer.h>
17
18#define SG_USBPHY1CTRL		0x500
19#define SG_USBPHY1CTRL2		0x504
20#define SG_USBPHY2CTRL		0x508
21#define SG_USBPHY2CTRL2		0x50c	/* LD11 */
22#define SG_USBPHY12PLL		0x50c	/* Pro4 */
23#define SG_USBPHY3CTRL		0x510
24#define SG_USBPHY3CTRL2		0x514
25#define SG_USBPHY4CTRL		0x518	/* Pro4 */
26#define SG_USBPHY4CTRL2		0x51c	/* Pro4 */
27#define SG_USBPHY34PLL		0x51c	/* Pro4 */
28
29struct uniphier_u2phy_param {
30	u32 offset;
31	u32 value;
32};
33
34struct uniphier_u2phy_soc_data {
35	struct uniphier_u2phy_param config0;
36	struct uniphier_u2phy_param config1;
37};
38
39struct uniphier_u2phy_priv {
40	struct regmap *regmap;
41	struct phy *phy;
42	struct regulator *vbus;
43	const struct uniphier_u2phy_soc_data *data;
44	struct uniphier_u2phy_priv *next;
45};
46
47static int uniphier_u2phy_power_on(struct phy *phy)
48{
49	struct uniphier_u2phy_priv *priv = phy_get_drvdata(phy);
50	int ret = 0;
51
52	if (priv->vbus)
53		ret = regulator_enable(priv->vbus);
54
55	return ret;
56}
57
58static int uniphier_u2phy_power_off(struct phy *phy)
59{
60	struct uniphier_u2phy_priv *priv = phy_get_drvdata(phy);
61
62	if (priv->vbus)
63		regulator_disable(priv->vbus);
64
65	return 0;
66}
67
68static int uniphier_u2phy_init(struct phy *phy)
69{
70	struct uniphier_u2phy_priv *priv = phy_get_drvdata(phy);
71
72	if (!priv->data)
73		return 0;
74
75	regmap_write(priv->regmap, priv->data->config0.offset,
76		     priv->data->config0.value);
77	regmap_write(priv->regmap, priv->data->config1.offset,
78		     priv->data->config1.value);
79
80	return 0;
81}
82
83static struct phy *uniphier_u2phy_xlate(struct device *dev,
84					const struct of_phandle_args *args)
85{
86	struct uniphier_u2phy_priv *priv = dev_get_drvdata(dev);
87
88	while (priv && args->np != priv->phy->dev.of_node)
89		priv = priv->next;
90
91	if (!priv) {
92		dev_err(dev, "Failed to find appropriate phy\n");
93		return ERR_PTR(-EINVAL);
94	}
95
96	return priv->phy;
97}
98
99static const struct phy_ops uniphier_u2phy_ops = {
100	.init      = uniphier_u2phy_init,
101	.power_on  = uniphier_u2phy_power_on,
102	.power_off = uniphier_u2phy_power_off,
103	.owner = THIS_MODULE,
104};
105
106static int uniphier_u2phy_probe(struct platform_device *pdev)
107{
108	struct device *dev = &pdev->dev;
109	struct device_node *parent, *child;
110	struct uniphier_u2phy_priv *priv = NULL, *next = NULL;
111	struct phy_provider *phy_provider;
112	struct regmap *regmap;
113	const struct uniphier_u2phy_soc_data *data;
114	int ret, data_idx, ndatas;
115
116	data = of_device_get_match_data(dev);
117	if (WARN_ON(!data))
118		return -EINVAL;
119
120	/* get number of data */
121	for (ndatas = 0; data[ndatas].config0.offset; ndatas++)
122		;
123
124	parent = of_get_parent(dev->of_node);
125	regmap = syscon_node_to_regmap(parent);
126	of_node_put(parent);
127	if (IS_ERR(regmap)) {
128		dev_err(dev, "Failed to get regmap\n");
129		return PTR_ERR(regmap);
130	}
131
132	for_each_child_of_node(dev->of_node, child) {
133		priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
134		if (!priv) {
135			ret = -ENOMEM;
136			goto out_put_child;
137		}
138		priv->regmap = regmap;
139
140		priv->vbus = devm_regulator_get_optional(dev, "vbus");
141		if (IS_ERR(priv->vbus)) {
142			if (PTR_ERR(priv->vbus) == -EPROBE_DEFER) {
143				ret = PTR_ERR(priv->vbus);
144				goto out_put_child;
145			}
146			priv->vbus = NULL;
147		}
148
149		priv->phy = devm_phy_create(dev, child, &uniphier_u2phy_ops);
150		if (IS_ERR(priv->phy)) {
151			dev_err(dev, "Failed to create phy\n");
152			ret = PTR_ERR(priv->phy);
153			goto out_put_child;
154		}
155
156		ret = of_property_read_u32(child, "reg", &data_idx);
157		if (ret) {
158			dev_err(dev, "Failed to get reg property\n");
159			goto out_put_child;
160		}
161
162		if (data_idx < ndatas)
163			priv->data = &data[data_idx];
164		else
165			dev_warn(dev, "No phy configuration: %s\n",
166				 child->full_name);
167
168		phy_set_drvdata(priv->phy, priv);
169		priv->next = next;
170		next = priv;
171	}
172
173	dev_set_drvdata(dev, priv);
174	phy_provider = devm_of_phy_provider_register(dev,
175						     uniphier_u2phy_xlate);
176	return PTR_ERR_OR_ZERO(phy_provider);
177
178out_put_child:
179	of_node_put(child);
180
181	return ret;
182}
183
184static const struct uniphier_u2phy_soc_data uniphier_pro4_data[] = {
185	{
186		.config0 = { SG_USBPHY1CTRL, 0x05142400 },
187		.config1 = { SG_USBPHY12PLL, 0x00010010 },
188	},
189	{
190		.config0 = { SG_USBPHY2CTRL, 0x05142400 },
191		.config1 = { SG_USBPHY12PLL, 0x00010010 },
192	},
193	{
194		.config0 = { SG_USBPHY3CTRL, 0x05142400 },
195		.config1 = { SG_USBPHY34PLL, 0x00010010 },
196	},
197	{
198		.config0 = { SG_USBPHY4CTRL, 0x05142400 },
199		.config1 = { SG_USBPHY34PLL, 0x00010010 },
200	},
201	{ /* sentinel */ }
202};
203
204static const struct uniphier_u2phy_soc_data uniphier_ld11_data[] = {
205	{
206		.config0 = { SG_USBPHY1CTRL,  0x82280000 },
207		.config1 = { SG_USBPHY1CTRL2, 0x00000106 },
208	},
209	{
210		.config0 = { SG_USBPHY2CTRL,  0x82280000 },
211		.config1 = { SG_USBPHY2CTRL2, 0x00000106 },
212	},
213	{
214		.config0 = { SG_USBPHY3CTRL,  0x82280000 },
215		.config1 = { SG_USBPHY3CTRL2, 0x00000106 },
216	},
217	{ /* sentinel */ }
218};
219
220static const struct of_device_id uniphier_u2phy_match[] = {
221	{
222		.compatible = "socionext,uniphier-pro4-usb2-phy",
223		.data = &uniphier_pro4_data,
224	},
225	{
226		.compatible = "socionext,uniphier-ld11-usb2-phy",
227		.data = &uniphier_ld11_data,
228	},
229	{ /* sentinel */ }
230};
231MODULE_DEVICE_TABLE(of, uniphier_u2phy_match);
232
233static struct platform_driver uniphier_u2phy_driver = {
234	.probe = uniphier_u2phy_probe,
235	.driver = {
236		.name = "uniphier-usb2-phy",
237		.of_match_table = uniphier_u2phy_match,
238	},
239};
240module_platform_driver(uniphier_u2phy_driver);
241
242MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
243MODULE_DESCRIPTION("UniPhier PHY driver for USB2 controller");
244MODULE_LICENSE("GPL v2");
245