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// SPDX-License-Identifier: GPL-2.0
//
// Regulator controller driver for UniPhier SoC
// Copyright 2018 Socionext Inc.
// Author: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#include <linux/reset.h>
#define MAX_CLKS 2
#define MAX_RSTS 2
struct uniphier_regulator_soc_data {
int nclks;
const char * const *clock_names;
int nrsts;
const char * const *reset_names;
const struct regulator_desc *desc;
const struct regmap_config *regconf;
};
struct uniphier_regulator_priv {
struct clk_bulk_data clk[MAX_CLKS];
struct reset_control *rst[MAX_RSTS];
const struct uniphier_regulator_soc_data *data;
};
static struct regulator_ops uniphier_regulator_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
};
static int uniphier_regulator_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct uniphier_regulator_priv *priv;
struct regulator_config config = { };
struct regulator_dev *rdev;
struct regmap *regmap;
struct resource *res;
void __iomem *base;
const char *name;
int i, ret, nr;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->data = of_device_get_match_data(dev);
if (WARN_ON(!priv->data))
return -EINVAL;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
for (i = 0; i < priv->data->nclks; i++)
priv->clk[i].id = priv->data->clock_names[i];
ret = devm_clk_bulk_get(dev, priv->data->nclks, priv->clk);
if (ret)
return ret;
for (i = 0; i < priv->data->nrsts; i++) {
name = priv->data->reset_names[i];
priv->rst[i] = devm_reset_control_get_shared(dev, name);
if (IS_ERR(priv->rst[i]))
return PTR_ERR(priv->rst[i]);
}
ret = clk_bulk_prepare_enable(priv->data->nclks, priv->clk);
if (ret)
return ret;
for (nr = 0; nr < priv->data->nrsts; nr++) {
ret = reset_control_deassert(priv->rst[nr]);
if (ret)
goto out_rst_assert;
}
regmap = devm_regmap_init_mmio(dev, base, priv->data->regconf);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
config.dev = dev;
config.driver_data = priv;
config.of_node = dev->of_node;
config.regmap = regmap;
config.init_data = of_get_regulator_init_data(dev, dev->of_node,
priv->data->desc);
rdev = devm_regulator_register(dev, priv->data->desc, &config);
if (IS_ERR(rdev)) {
ret = PTR_ERR(rdev);
goto out_rst_assert;
}
platform_set_drvdata(pdev, priv);
return 0;
out_rst_assert:
while (nr--)
reset_control_assert(priv->rst[nr]);
clk_bulk_disable_unprepare(priv->data->nclks, priv->clk);
return ret;
}
static int uniphier_regulator_remove(struct platform_device *pdev)
{
struct uniphier_regulator_priv *priv = platform_get_drvdata(pdev);
int i;
for (i = 0; i < priv->data->nrsts; i++)
reset_control_assert(priv->rst[i]);
clk_bulk_disable_unprepare(priv->data->nclks, priv->clk);
return 0;
}
/* USB3 controller data */
#define USB3VBUS_OFFSET 0x0
#define USB3VBUS_REG BIT(4)
#define USB3VBUS_REG_EN BIT(3)
static const struct regulator_desc uniphier_usb3_regulator_desc = {
.name = "vbus",
.of_match = of_match_ptr("vbus"),
.ops = &uniphier_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.enable_reg = USB3VBUS_OFFSET,
.enable_mask = USB3VBUS_REG_EN | USB3VBUS_REG,
.enable_val = USB3VBUS_REG_EN | USB3VBUS_REG,
.disable_val = USB3VBUS_REG_EN,
};
static const struct regmap_config uniphier_usb3_regulator_regconf = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = 1,
};
static const char * const uniphier_pro4_clock_reset_names[] = {
"gio", "link",
};
static const struct uniphier_regulator_soc_data uniphier_pro4_usb3_data = {
.nclks = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
.clock_names = uniphier_pro4_clock_reset_names,
.nrsts = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
.reset_names = uniphier_pro4_clock_reset_names,
.desc = &uniphier_usb3_regulator_desc,
.regconf = &uniphier_usb3_regulator_regconf,
};
static const char * const uniphier_pxs2_clock_reset_names[] = {
"link",
};
static const struct uniphier_regulator_soc_data uniphier_pxs2_usb3_data = {
.nclks = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
.clock_names = uniphier_pxs2_clock_reset_names,
.nrsts = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
.reset_names = uniphier_pxs2_clock_reset_names,
.desc = &uniphier_usb3_regulator_desc,
.regconf = &uniphier_usb3_regulator_regconf,
};
static const struct of_device_id uniphier_regulator_match[] = {
/* USB VBUS */
{
.compatible = "socionext,uniphier-pro4-usb3-regulator",
.data = &uniphier_pro4_usb3_data,
},
{
.compatible = "socionext,uniphier-pxs2-usb3-regulator",
.data = &uniphier_pxs2_usb3_data,
},
{
.compatible = "socionext,uniphier-ld20-usb3-regulator",
.data = &uniphier_pxs2_usb3_data,
},
{
.compatible = "socionext,uniphier-pxs3-usb3-regulator",
.data = &uniphier_pxs2_usb3_data,
},
{ /* Sentinel */ },
};
static struct platform_driver uniphier_regulator_driver = {
.probe = uniphier_regulator_probe,
.remove = uniphier_regulator_remove,
.driver = {
.name = "uniphier-regulator",
.of_match_table = uniphier_regulator_match,
},
};
module_platform_driver(uniphier_regulator_driver);
MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
MODULE_DESCRIPTION("UniPhier Regulator Controller Driver");
MODULE_LICENSE("GPL");
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