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186 lines
4.4 KiB
186 lines
4.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// Copyright (C) STMicroelectronics 2019 |
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// Authors: Gabriel Fernandez <[email protected]> |
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// Pascal Paillet <[email protected]>. |
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#include <linux/io.h> |
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#include <linux/iopoll.h> |
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#include <linux/module.h> |
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#include <linux/of_address.h> |
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#include <linux/of_device.h> |
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#include <linux/platform_device.h> |
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#include <linux/regulator/driver.h> |
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#include <linux/regulator/of_regulator.h> |
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/* |
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* Registers description |
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*/ |
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#define REG_PWR_CR3 0x0C |
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#define USB_3_3_EN BIT(24) |
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#define USB_3_3_RDY BIT(26) |
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#define REG_1_8_EN BIT(28) |
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#define REG_1_8_RDY BIT(29) |
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#define REG_1_1_EN BIT(30) |
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#define REG_1_1_RDY BIT(31) |
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/* list of supported regulators */ |
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enum { |
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PWR_REG11, |
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PWR_REG18, |
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PWR_USB33, |
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STM32PWR_REG_NUM_REGS |
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}; |
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static u32 ready_mask_table[STM32PWR_REG_NUM_REGS] = { |
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[PWR_REG11] = REG_1_1_RDY, |
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[PWR_REG18] = REG_1_8_RDY, |
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[PWR_USB33] = USB_3_3_RDY, |
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}; |
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struct stm32_pwr_reg { |
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void __iomem *base; |
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u32 ready_mask; |
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}; |
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static int stm32_pwr_reg_is_ready(struct regulator_dev *rdev) |
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{ |
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struct stm32_pwr_reg *priv = rdev_get_drvdata(rdev); |
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u32 val; |
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val = readl_relaxed(priv->base + REG_PWR_CR3); |
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return (val & priv->ready_mask); |
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} |
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static int stm32_pwr_reg_is_enabled(struct regulator_dev *rdev) |
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{ |
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struct stm32_pwr_reg *priv = rdev_get_drvdata(rdev); |
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u32 val; |
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val = readl_relaxed(priv->base + REG_PWR_CR3); |
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return (val & rdev->desc->enable_mask); |
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} |
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static int stm32_pwr_reg_enable(struct regulator_dev *rdev) |
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{ |
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struct stm32_pwr_reg *priv = rdev_get_drvdata(rdev); |
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int ret; |
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u32 val; |
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val = readl_relaxed(priv->base + REG_PWR_CR3); |
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val |= rdev->desc->enable_mask; |
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writel_relaxed(val, priv->base + REG_PWR_CR3); |
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/* use an arbitrary timeout of 20ms */ |
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ret = readx_poll_timeout(stm32_pwr_reg_is_ready, rdev, val, val, |
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100, 20 * 1000); |
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if (ret) |
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dev_err(&rdev->dev, "regulator enable timed out!\n"); |
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return ret; |
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} |
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static int stm32_pwr_reg_disable(struct regulator_dev *rdev) |
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{ |
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struct stm32_pwr_reg *priv = rdev_get_drvdata(rdev); |
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int ret; |
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u32 val; |
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val = readl_relaxed(priv->base + REG_PWR_CR3); |
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val &= ~rdev->desc->enable_mask; |
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writel_relaxed(val, priv->base + REG_PWR_CR3); |
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/* use an arbitrary timeout of 20ms */ |
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ret = readx_poll_timeout(stm32_pwr_reg_is_ready, rdev, val, !val, |
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100, 20 * 1000); |
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if (ret) |
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dev_err(&rdev->dev, "regulator disable timed out!\n"); |
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return ret; |
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} |
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static const struct regulator_ops stm32_pwr_reg_ops = { |
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.enable = stm32_pwr_reg_enable, |
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.disable = stm32_pwr_reg_disable, |
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.is_enabled = stm32_pwr_reg_is_enabled, |
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}; |
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#define PWR_REG(_id, _name, _volt, _en, _supply) \ |
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[_id] = { \ |
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.id = _id, \ |
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.name = _name, \ |
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.of_match = of_match_ptr(_name), \ |
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.n_voltages = 1, \ |
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.type = REGULATOR_VOLTAGE, \ |
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.fixed_uV = _volt, \ |
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.ops = &stm32_pwr_reg_ops, \ |
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.enable_mask = _en, \ |
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.owner = THIS_MODULE, \ |
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.supply_name = _supply, \ |
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} \ |
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static const struct regulator_desc stm32_pwr_desc[] = { |
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PWR_REG(PWR_REG11, "reg11", 1100000, REG_1_1_EN, "vdd"), |
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PWR_REG(PWR_REG18, "reg18", 1800000, REG_1_8_EN, "vdd"), |
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PWR_REG(PWR_USB33, "usb33", 3300000, USB_3_3_EN, "vdd_3v3_usbfs"), |
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}; |
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static int stm32_pwr_regulator_probe(struct platform_device *pdev) |
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{ |
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struct device_node *np = pdev->dev.of_node; |
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struct stm32_pwr_reg *priv; |
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void __iomem *base; |
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struct regulator_dev *rdev; |
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struct regulator_config config = { }; |
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int i, ret = 0; |
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base = of_iomap(np, 0); |
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if (!base) { |
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dev_err(&pdev->dev, "Unable to map IO memory\n"); |
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return -ENOMEM; |
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} |
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config.dev = &pdev->dev; |
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for (i = 0; i < STM32PWR_REG_NUM_REGS; i++) { |
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priv = devm_kzalloc(&pdev->dev, sizeof(struct stm32_pwr_reg), |
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GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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priv->base = base; |
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priv->ready_mask = ready_mask_table[i]; |
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config.driver_data = priv; |
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rdev = devm_regulator_register(&pdev->dev, |
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&stm32_pwr_desc[i], |
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&config); |
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if (IS_ERR(rdev)) { |
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ret = PTR_ERR(rdev); |
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dev_err(&pdev->dev, |
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"Failed to register regulator: %d\n", ret); |
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break; |
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} |
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} |
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return ret; |
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} |
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static const struct of_device_id __maybe_unused stm32_pwr_of_match[] = { |
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{ .compatible = "st,stm32mp1,pwr-reg", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, stm32_pwr_of_match); |
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static struct platform_driver stm32_pwr_driver = { |
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.probe = stm32_pwr_regulator_probe, |
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.driver = { |
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.name = "stm32-pwr-regulator", |
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.of_match_table = of_match_ptr(stm32_pwr_of_match), |
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}, |
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}; |
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module_platform_driver(stm32_pwr_driver); |
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MODULE_DESCRIPTION("STM32MP1 PWR voltage regulator driver"); |
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MODULE_AUTHOR("Pascal Paillet <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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