159 lines
4.3 KiB
C
159 lines
4.3 KiB
C
/*
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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 <gregory.clement@free-electrons.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2 or later. This program is licensed "as is"
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* without any warranty of any kind, whether express or implied.
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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/module.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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MODULE_DEVICE_TABLE(of, of_usb_cluster_table);
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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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module_platform_driver(armada375_usb_phy_driver);
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MODULE_DESCRIPTION("Armada 375 USB cluster driver");
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MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
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MODULE_LICENSE("GPL");
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