2 * USB cluster support for Armada 375 platform.
4 * Copyright (C) 2014 Marvell
6 * Gregory CLEMENT <gregory.clement@free-electrons.com>
8 * This file is licensed under the terms of the GNU General Public
9 * License version 2 or later. This program is licensed "as is"
10 * without any warranty of any kind, whether express or implied.
12 * Armada 375 comes with an USB2 host and device controller and an
13 * USB3 controller. The USB cluster control register allows to manage
14 * common features of both USB controllers.
17 #include <dt-bindings/phy/phy.h>
18 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/of_address.h>
22 #include <linux/phy/phy.h>
23 #include <linux/platform_device.h>
25 #define USB2_PHY_CONFIG_DISABLE BIT(0)
27 struct armada375_cluster_phy {
34 static int armada375_usb_phy_init(struct phy *phy)
36 struct armada375_cluster_phy *cluster_phy;
39 cluster_phy = phy_get_drvdata(phy);
43 reg = readl(cluster_phy->reg);
44 if (cluster_phy->use_usb3)
45 reg |= USB2_PHY_CONFIG_DISABLE;
47 reg &= ~USB2_PHY_CONFIG_DISABLE;
48 writel(reg, cluster_phy->reg);
53 static const struct phy_ops armada375_usb_phy_ops = {
54 .init = armada375_usb_phy_init,
59 * Only one controller can use this PHY. We shouldn't have the case
60 * when two controllers want to use this PHY. But if this case occurs
61 * then we provide a phy to the first one and return an error for the
62 * next one. This error has also to be an error returned by
63 * devm_phy_optional_get() so different from ENODEV for USB2. In the
64 * USB3 case it still optional and we use ENODEV.
66 static struct phy *armada375_usb_phy_xlate(struct device *dev,
67 struct of_phandle_args *args)
69 struct armada375_cluster_phy *cluster_phy = dev_get_drvdata(dev);
72 return ERR_PTR(-ENODEV);
75 * Either the phy had never been requested and then the first
76 * usb claiming it can get it, or it had already been
77 * requested in this case, we only allow to use it with the
80 if (WARN_ON((cluster_phy->phy_provided != PHY_NONE) &&
81 (cluster_phy->phy_provided != args->args[0]))) {
82 dev_err(dev, "This PHY has already been provided!\n");
83 dev_err(dev, "Check your device tree, only one controller can use it\n.");
84 if (args->args[0] == PHY_TYPE_USB2)
85 return ERR_PTR(-EBUSY);
87 return ERR_PTR(-ENODEV);
90 if (args->args[0] == PHY_TYPE_USB2)
91 cluster_phy->use_usb3 = false;
92 else if (args->args[0] == PHY_TYPE_USB3)
93 cluster_phy->use_usb3 = true;
95 dev_err(dev, "Invalid PHY mode\n");
96 return ERR_PTR(-ENODEV);
99 /* Store which phy mode is used for next test */
100 cluster_phy->phy_provided = args->args[0];
102 return cluster_phy->phy;
105 static int armada375_usb_phy_probe(struct platform_device *pdev)
107 struct device *dev = &pdev->dev;
109 struct phy_provider *phy_provider;
110 void __iomem *usb_cluster_base;
111 struct resource *res;
112 struct armada375_cluster_phy *cluster_phy;
114 cluster_phy = devm_kzalloc(dev, sizeof(*cluster_phy), GFP_KERNEL);
118 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
119 usb_cluster_base = devm_ioremap_resource(&pdev->dev, res);
120 if (IS_ERR(usb_cluster_base))
121 return PTR_ERR(usb_cluster_base);
123 phy = devm_phy_create(dev, NULL, &armada375_usb_phy_ops);
125 dev_err(dev, "failed to create PHY\n");
129 cluster_phy->phy = phy;
130 cluster_phy->reg = usb_cluster_base;
132 dev_set_drvdata(dev, cluster_phy);
133 phy_set_drvdata(phy, cluster_phy);
135 phy_provider = devm_of_phy_provider_register(&pdev->dev,
136 armada375_usb_phy_xlate);
137 return PTR_ERR_OR_ZERO(phy_provider);
140 static const struct of_device_id of_usb_cluster_table[] = {
141 { .compatible = "marvell,armada-375-usb-cluster", },
142 { /* end of list */ },
145 static struct platform_driver armada375_usb_phy_driver = {
146 .probe = armada375_usb_phy_probe,
148 .of_match_table = of_usb_cluster_table,
149 .name = "armada-375-usb-cluster",
152 builtin_platform_driver(armada375_usb_phy_driver);