150 lines
3.5 KiB
C
150 lines
3.5 KiB
C
/*
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* PHY driver for NXP LPC18xx/43xx internal USB OTG PHY
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*
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* Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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/* USB OTG PHY register offset and bit in CREG */
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#define LPC18XX_CREG_CREG0 0x004
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#define LPC18XX_CREG_CREG0_USB0PHY BIT(5)
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struct lpc18xx_usb_otg_phy {
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struct phy *phy;
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struct clk *clk;
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struct regmap *reg;
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};
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static int lpc18xx_usb_otg_phy_init(struct phy *phy)
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{
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struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
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int ret;
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/* The PHY must be clocked at 480 MHz */
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ret = clk_set_rate(lpc->clk, 480000000);
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if (ret)
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return ret;
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return clk_prepare(lpc->clk);
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}
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static int lpc18xx_usb_otg_phy_exit(struct phy *phy)
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{
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struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
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clk_unprepare(lpc->clk);
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return 0;
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}
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static int lpc18xx_usb_otg_phy_power_on(struct phy *phy)
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{
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struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
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int ret;
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ret = clk_enable(lpc->clk);
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if (ret)
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return ret;
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/* The bit in CREG is cleared to enable the PHY */
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ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0,
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LPC18XX_CREG_CREG0_USB0PHY, 0);
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if (ret) {
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clk_disable(lpc->clk);
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return ret;
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}
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return 0;
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}
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static int lpc18xx_usb_otg_phy_power_off(struct phy *phy)
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{
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struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
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int ret;
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ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0,
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LPC18XX_CREG_CREG0_USB0PHY,
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LPC18XX_CREG_CREG0_USB0PHY);
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if (ret)
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return ret;
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clk_disable(lpc->clk);
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return 0;
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}
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static const struct phy_ops lpc18xx_usb_otg_phy_ops = {
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.init = lpc18xx_usb_otg_phy_init,
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.exit = lpc18xx_usb_otg_phy_exit,
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.power_on = lpc18xx_usb_otg_phy_power_on,
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.power_off = lpc18xx_usb_otg_phy_power_off,
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.owner = THIS_MODULE,
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};
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static int lpc18xx_usb_otg_phy_probe(struct platform_device *pdev)
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{
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struct phy_provider *phy_provider;
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struct lpc18xx_usb_otg_phy *lpc;
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lpc = devm_kzalloc(&pdev->dev, sizeof(*lpc), GFP_KERNEL);
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if (!lpc)
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return -ENOMEM;
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lpc->reg = syscon_node_to_regmap(pdev->dev.of_node->parent);
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if (IS_ERR(lpc->reg)) {
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dev_err(&pdev->dev, "failed to get syscon\n");
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return PTR_ERR(lpc->reg);
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}
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lpc->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(lpc->clk)) {
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dev_err(&pdev->dev, "failed to get clock\n");
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return PTR_ERR(lpc->clk);
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}
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lpc->phy = devm_phy_create(&pdev->dev, NULL, &lpc18xx_usb_otg_phy_ops);
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if (IS_ERR(lpc->phy)) {
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dev_err(&pdev->dev, "failed to create PHY\n");
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return PTR_ERR(lpc->phy);
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}
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phy_set_drvdata(lpc->phy, lpc);
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phy_provider = devm_of_phy_provider_register(&pdev->dev,
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of_phy_simple_xlate);
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return PTR_ERR_OR_ZERO(phy_provider);
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}
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static const struct of_device_id lpc18xx_usb_otg_phy_match[] = {
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{ .compatible = "nxp,lpc1850-usb-otg-phy" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, lpc18xx_usb_otg_phy_match);
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static struct platform_driver lpc18xx_usb_otg_phy_driver = {
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.probe = lpc18xx_usb_otg_phy_probe,
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.driver = {
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.name = "lpc18xx-usb-otg-phy",
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.of_match_table = lpc18xx_usb_otg_phy_match,
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},
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};
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module_platform_driver(lpc18xx_usb_otg_phy_driver);
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MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
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MODULE_DESCRIPTION("NXP LPC18xx/43xx USB OTG PHY driver");
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MODULE_LICENSE("GPL v2");
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