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149 lines
4.0 KiB
149 lines
4.0 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* USB cluster support for Armada 375 platform. |
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* |
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* Copyright (C) 2014 Marvell |
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* |
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* Gregory CLEMENT <[email protected]> |
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* |
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* Armada 375 comes with an USB2 host and device controller and an |
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* USB3 controller. The USB cluster control register allows to manage |
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* common features of both USB controllers. |
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*/ |
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#include <dt-bindings/phy/phy.h> |
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#include <linux/init.h> |
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#include <linux/io.h> |
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#include <linux/kernel.h> |
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#include <linux/of_address.h> |
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#include <linux/phy/phy.h> |
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#include <linux/platform_device.h> |
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#define USB2_PHY_CONFIG_DISABLE BIT(0) |
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struct armada375_cluster_phy { |
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struct phy *phy; |
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void __iomem *reg; |
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bool use_usb3; |
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int phy_provided; |
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}; |
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static int armada375_usb_phy_init(struct phy *phy) |
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{ |
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struct armada375_cluster_phy *cluster_phy; |
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u32 reg; |
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cluster_phy = phy_get_drvdata(phy); |
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if (!cluster_phy) |
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return -ENODEV; |
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reg = readl(cluster_phy->reg); |
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if (cluster_phy->use_usb3) |
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reg |= USB2_PHY_CONFIG_DISABLE; |
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else |
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reg &= ~USB2_PHY_CONFIG_DISABLE; |
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writel(reg, cluster_phy->reg); |
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return 0; |
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} |
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static const struct phy_ops armada375_usb_phy_ops = { |
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.init = armada375_usb_phy_init, |
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.owner = THIS_MODULE, |
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}; |
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/* |
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* Only one controller can use this PHY. We shouldn't have the case |
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* when two controllers want to use this PHY. But if this case occurs |
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* then we provide a phy to the first one and return an error for the |
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* next one. This error has also to be an error returned by |
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* devm_phy_optional_get() so different from ENODEV for USB2. In the |
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* USB3 case it still optional and we use ENODEV. |
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*/ |
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static struct phy *armada375_usb_phy_xlate(struct device *dev, |
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struct of_phandle_args *args) |
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{ |
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struct armada375_cluster_phy *cluster_phy = dev_get_drvdata(dev); |
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if (!cluster_phy) |
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return ERR_PTR(-ENODEV); |
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/* |
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* Either the phy had never been requested and then the first |
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* usb claiming it can get it, or it had already been |
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* requested in this case, we only allow to use it with the |
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* same configuration. |
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*/ |
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if (WARN_ON((cluster_phy->phy_provided != PHY_NONE) && |
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(cluster_phy->phy_provided != args->args[0]))) { |
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dev_err(dev, "This PHY has already been provided!\n"); |
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dev_err(dev, "Check your device tree, only one controller can use it\n."); |
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if (args->args[0] == PHY_TYPE_USB2) |
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return ERR_PTR(-EBUSY); |
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else |
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return ERR_PTR(-ENODEV); |
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} |
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if (args->args[0] == PHY_TYPE_USB2) |
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cluster_phy->use_usb3 = false; |
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else if (args->args[0] == PHY_TYPE_USB3) |
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cluster_phy->use_usb3 = true; |
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else { |
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dev_err(dev, "Invalid PHY mode\n"); |
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return ERR_PTR(-ENODEV); |
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} |
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/* Store which phy mode is used for next test */ |
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cluster_phy->phy_provided = args->args[0]; |
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return cluster_phy->phy; |
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} |
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static int armada375_usb_phy_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct phy *phy; |
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struct phy_provider *phy_provider; |
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void __iomem *usb_cluster_base; |
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struct resource *res; |
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struct armada375_cluster_phy *cluster_phy; |
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cluster_phy = devm_kzalloc(dev, sizeof(*cluster_phy), GFP_KERNEL); |
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if (!cluster_phy) |
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return -ENOMEM; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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usb_cluster_base = devm_ioremap_resource(&pdev->dev, res); |
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if (IS_ERR(usb_cluster_base)) |
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return PTR_ERR(usb_cluster_base); |
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phy = devm_phy_create(dev, NULL, &armada375_usb_phy_ops); |
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if (IS_ERR(phy)) { |
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dev_err(dev, "failed to create PHY\n"); |
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return PTR_ERR(phy); |
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} |
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cluster_phy->phy = phy; |
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cluster_phy->reg = usb_cluster_base; |
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dev_set_drvdata(dev, cluster_phy); |
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phy_set_drvdata(phy, cluster_phy); |
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phy_provider = devm_of_phy_provider_register(&pdev->dev, |
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armada375_usb_phy_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 of_usb_cluster_table[] = { |
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{ .compatible = "marvell,armada-375-usb-cluster", }, |
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{ /* end of list */ }, |
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}; |
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static struct platform_driver armada375_usb_phy_driver = { |
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.probe = armada375_usb_phy_probe, |
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.driver = { |
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.of_match_table = of_usb_cluster_table, |
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.name = "armada-375-usb-cluster", |
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} |
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}; |
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builtin_platform_driver(armada375_usb_phy_driver);
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