diff options
Diffstat (limited to 'drivers/regulator/uniphier-regulator.c')
| -rw-r--r-- | drivers/regulator/uniphier-regulator.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/drivers/regulator/uniphier-regulator.c b/drivers/regulator/uniphier-regulator.c new file mode 100644 index 000000000..a2e3654b6 --- /dev/null +++ b/drivers/regulator/uniphier-regulator.c @@ -0,0 +1,214 @@ +// 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 */ }, +}; +MODULE_DEVICE_TABLE(of, uniphier_regulator_match); + +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"); |