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1// SPDX-License-Identifier: GPL-2.0+2/*3 * USB cluster support for Armada 375 platform.4 *5 * Copyright (C) 2014 Marvell6 *7 * Gregory CLEMENT <gregory.clement@free-electrons.com>8 *9 * Armada 375 comes with an USB2 host and device controller and an10 * USB3 controller. The USB cluster control register allows to manage11 * common features of both USB controllers.12 */13 14#include <dt-bindings/phy/phy.h>15#include <linux/init.h>16#include <linux/io.h>17#include <linux/kernel.h>18#include <linux/of_address.h>19#include <linux/phy/phy.h>20#include <linux/platform_device.h>21 22#define USB2_PHY_CONFIG_DISABLE BIT(0)23 24struct armada375_cluster_phy {25 struct phy *phy;26 void __iomem *reg;27 bool use_usb3;28 int phy_provided;29};30 31static int armada375_usb_phy_init(struct phy *phy)32{33 struct armada375_cluster_phy *cluster_phy;34 u32 reg;35 36 cluster_phy = phy_get_drvdata(phy);37 if (!cluster_phy)38 return -ENODEV;39 40 reg = readl(cluster_phy->reg);41 if (cluster_phy->use_usb3)42 reg |= USB2_PHY_CONFIG_DISABLE;43 else44 reg &= ~USB2_PHY_CONFIG_DISABLE;45 writel(reg, cluster_phy->reg);46 47 return 0;48}49 50static const struct phy_ops armada375_usb_phy_ops = {51 .init = armada375_usb_phy_init,52 .owner = THIS_MODULE,53};54 55/*56 * Only one controller can use this PHY. We shouldn't have the case57 * when two controllers want to use this PHY. But if this case occurs58 * then we provide a phy to the first one and return an error for the59 * next one. This error has also to be an error returned by60 * devm_phy_optional_get() so different from ENODEV for USB2. In the61 * USB3 case it still optional and we use ENODEV.62 */63static struct phy *armada375_usb_phy_xlate(struct device *dev,64 const struct of_phandle_args *args)65{66 struct armada375_cluster_phy *cluster_phy = dev_get_drvdata(dev);67 68 if (!cluster_phy)69 return ERR_PTR(-ENODEV);70 71 /*72 * Either the phy had never been requested and then the first73 * usb claiming it can get it, or it had already been74 * requested in this case, we only allow to use it with the75 * same configuration.76 */77 if (WARN_ON((cluster_phy->phy_provided != PHY_NONE) &&78 (cluster_phy->phy_provided != args->args[0]))) {79 dev_err(dev, "This PHY has already been provided!\n");80 dev_err(dev, "Check your device tree, only one controller can use it\n.");81 if (args->args[0] == PHY_TYPE_USB2)82 return ERR_PTR(-EBUSY);83 else84 return ERR_PTR(-ENODEV);85 }86 87 if (args->args[0] == PHY_TYPE_USB2)88 cluster_phy->use_usb3 = false;89 else if (args->args[0] == PHY_TYPE_USB3)90 cluster_phy->use_usb3 = true;91 else {92 dev_err(dev, "Invalid PHY mode\n");93 return ERR_PTR(-ENODEV);94 }95 96 /* Store which phy mode is used for next test */97 cluster_phy->phy_provided = args->args[0];98 99 return cluster_phy->phy;100}101 102static int armada375_usb_phy_probe(struct platform_device *pdev)103{104 struct device *dev = &pdev->dev;105 struct phy *phy;106 struct phy_provider *phy_provider;107 void __iomem *usb_cluster_base;108 struct armada375_cluster_phy *cluster_phy;109 110 cluster_phy = devm_kzalloc(dev, sizeof(*cluster_phy), GFP_KERNEL);111 if (!cluster_phy)112 return -ENOMEM;113 114 usb_cluster_base = devm_platform_ioremap_resource(pdev, 0);115 if (IS_ERR(usb_cluster_base))116 return PTR_ERR(usb_cluster_base);117 118 phy = devm_phy_create(dev, NULL, &armada375_usb_phy_ops);119 if (IS_ERR(phy)) {120 dev_err(dev, "failed to create PHY\n");121 return PTR_ERR(phy);122 }123 124 cluster_phy->phy = phy;125 cluster_phy->reg = usb_cluster_base;126 127 dev_set_drvdata(dev, cluster_phy);128 phy_set_drvdata(phy, cluster_phy);129 130 phy_provider = devm_of_phy_provider_register(&pdev->dev,131 armada375_usb_phy_xlate);132 return PTR_ERR_OR_ZERO(phy_provider);133}134 135static const struct of_device_id of_usb_cluster_table[] = {136 { .compatible = "marvell,armada-375-usb-cluster", },137 { /* end of list */ },138};139 140static struct platform_driver armada375_usb_phy_driver = {141 .probe = armada375_usb_phy_probe,142 .driver = {143 .of_match_table = of_usb_cluster_table,144 .name = "armada-375-usb-cluster",145 }146};147builtin_platform_driver(armada375_usb_phy_driver);148