1// SPDX-License-Identifier: GPL-2.0
  2//
  3// Regulator controller driver for UniPhier SoC
  4// Copyright 2018 Socionext Inc.
  5// Author: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
  6
  7#include <linux/clk.h>
  8#include <linux/io.h>
  9#include <linux/module.h>
 10#include <linux/of.h>
 11#include <linux/platform_device.h>
 12#include <linux/regmap.h>
 13#include <linux/regulator/driver.h>
 14#include <linux/regulator/of_regulator.h>
 15#include <linux/reset.h>
 16
 17#define MAX_CLKS	2
 18#define MAX_RSTS	2
 19
 20struct uniphier_regulator_soc_data {
 21	int nclks;
 22	const char * const *clock_names;
 23	int nrsts;
 24	const char * const *reset_names;
 25	const struct regulator_desc *desc;
 26	const struct regmap_config *regconf;
 27};
 28
 29struct uniphier_regulator_priv {
 30	struct clk_bulk_data clk[MAX_CLKS];
 31	struct reset_control *rst[MAX_RSTS];
 32	const struct uniphier_regulator_soc_data *data;
 33};
 34
 35static const struct regulator_ops uniphier_regulator_ops = {
 36	.enable     = regulator_enable_regmap,
 37	.disable    = regulator_disable_regmap,
 38	.is_enabled = regulator_is_enabled_regmap,
 39};
 40
 41static int uniphier_regulator_probe(struct platform_device *pdev)
 42{
 43	struct device *dev = &pdev->dev;
 44	struct uniphier_regulator_priv *priv;
 45	struct regulator_config config = { };
 46	struct regulator_dev *rdev;
 47	struct regmap *regmap;
 48	void __iomem *base;
 49	const char *name;
 50	int i, ret, nr;
 51
 52	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 53	if (!priv)
 54		return -ENOMEM;
 55
 56	priv->data = of_device_get_match_data(dev);
 57	if (WARN_ON(!priv->data))
 58		return -EINVAL;
 59
 60	base = devm_platform_ioremap_resource(pdev, 0);
 61	if (IS_ERR(base))
 62		return PTR_ERR(base);
 63
 64	for (i = 0; i < priv->data->nclks; i++)
 65		priv->clk[i].id = priv->data->clock_names[i];
 66	ret = devm_clk_bulk_get(dev, priv->data->nclks, priv->clk);
 67	if (ret)
 68		return ret;
 69
 70	for (i = 0; i < priv->data->nrsts; i++) {
 71		name = priv->data->reset_names[i];
 72		priv->rst[i] = devm_reset_control_get_shared(dev, name);
 73		if (IS_ERR(priv->rst[i]))
 74			return PTR_ERR(priv->rst[i]);
 75	}
 76
 77	ret = clk_bulk_prepare_enable(priv->data->nclks, priv->clk);
 78	if (ret)
 79		return ret;
 80
 81	for (nr = 0; nr < priv->data->nrsts; nr++) {
 82		ret = reset_control_deassert(priv->rst[nr]);
 83		if (ret)
 84			goto out_rst_assert;
 85	}
 86
 87	regmap = devm_regmap_init_mmio(dev, base, priv->data->regconf);
 88	if (IS_ERR(regmap)) {
 89		ret = PTR_ERR(regmap);
 90		goto out_rst_assert;
 91	}
 92
 93	config.dev = dev;
 94	config.driver_data = priv;
 95	config.of_node = dev->of_node;
 96	config.regmap = regmap;
 97	config.init_data = of_get_regulator_init_data(dev, dev->of_node,
 98						      priv->data->desc);
 99	rdev = devm_regulator_register(dev, priv->data->desc, &config);
100	if (IS_ERR(rdev)) {
101		ret = PTR_ERR(rdev);
102		goto out_rst_assert;
103	}
104
105	platform_set_drvdata(pdev, priv);
106
107	return 0;
108
109out_rst_assert:
110	while (nr--)
111		reset_control_assert(priv->rst[nr]);
112
113	clk_bulk_disable_unprepare(priv->data->nclks, priv->clk);
114
115	return ret;
116}
117
118static void uniphier_regulator_remove(struct platform_device *pdev)
119{
120	struct uniphier_regulator_priv *priv = platform_get_drvdata(pdev);
121	int i;
122
123	for (i = 0; i < priv->data->nrsts; i++)
124		reset_control_assert(priv->rst[i]);
125
126	clk_bulk_disable_unprepare(priv->data->nclks, priv->clk);
127}
128
129/* USB3 controller data */
130#define USB3VBUS_OFFSET		0x0
131#define USB3VBUS_REG		BIT(4)
132#define USB3VBUS_REG_EN		BIT(3)
133static const struct regulator_desc uniphier_usb3_regulator_desc = {
134	.name = "vbus",
135	.of_match = of_match_ptr("vbus"),
136	.ops = &uniphier_regulator_ops,
137	.type = REGULATOR_VOLTAGE,
138	.owner = THIS_MODULE,
139	.enable_reg  = USB3VBUS_OFFSET,
140	.enable_mask = USB3VBUS_REG_EN | USB3VBUS_REG,
141	.enable_val  = USB3VBUS_REG_EN | USB3VBUS_REG,
142	.disable_val = USB3VBUS_REG_EN,
143};
144
145static const struct regmap_config uniphier_usb3_regulator_regconf = {
146	.reg_bits = 32,
147	.val_bits = 32,
148	.reg_stride = 4,
149	.max_register = 1,
150};
151
152static const char * const uniphier_pro4_clock_reset_names[] = {
153	"gio", "link",
154};
155
156static const struct uniphier_regulator_soc_data uniphier_pro4_usb3_data = {
157	.nclks = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
158	.clock_names = uniphier_pro4_clock_reset_names,
159	.nrsts = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
160	.reset_names = uniphier_pro4_clock_reset_names,
161	.desc = &uniphier_usb3_regulator_desc,
162	.regconf = &uniphier_usb3_regulator_regconf,
163};
164
165static const char * const uniphier_pxs2_clock_reset_names[] = {
166	"link",
167};
168
169static const struct uniphier_regulator_soc_data uniphier_pxs2_usb3_data = {
170	.nclks = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
171	.clock_names = uniphier_pxs2_clock_reset_names,
172	.nrsts = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
173	.reset_names = uniphier_pxs2_clock_reset_names,
174	.desc = &uniphier_usb3_regulator_desc,
175	.regconf = &uniphier_usb3_regulator_regconf,
176};
177
178static const struct of_device_id uniphier_regulator_match[] = {
179	/* USB VBUS */
180	{
181		.compatible = "socionext,uniphier-pro4-usb3-regulator",
182		.data = &uniphier_pro4_usb3_data,
183	},
184	{
185		.compatible = "socionext,uniphier-pro5-usb3-regulator",
186		.data = &uniphier_pro4_usb3_data,
187	},
188	{
189		.compatible = "socionext,uniphier-pxs2-usb3-regulator",
190		.data = &uniphier_pxs2_usb3_data,
191	},
192	{
193		.compatible = "socionext,uniphier-ld20-usb3-regulator",
194		.data = &uniphier_pxs2_usb3_data,
195	},
196	{
197		.compatible = "socionext,uniphier-pxs3-usb3-regulator",
198		.data = &uniphier_pxs2_usb3_data,
199	},
200	{
201		.compatible = "socionext,uniphier-nx1-usb3-regulator",
202		.data = &uniphier_pxs2_usb3_data,
203	},
204	{ /* Sentinel */ },
205};
206MODULE_DEVICE_TABLE(of, uniphier_regulator_match);
207
208static struct platform_driver uniphier_regulator_driver = {
209	.probe = uniphier_regulator_probe,
210	.remove = uniphier_regulator_remove,
211	.driver = {
212		.name  = "uniphier-regulator",
213		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
214		.of_match_table = uniphier_regulator_match,
215	},
216};
217module_platform_driver(uniphier_regulator_driver);
218
219MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
220MODULE_DESCRIPTION("UniPhier Regulator Controller Driver");
221MODULE_LICENSE("GPL");