Gregory CLEMENT | eee4753 | 2014-11-13 12:47:46 +0100 | [diff] [blame] | 1 | /* |
| 2 | * USB cluster support for Armada 375 platform. |
| 3 | * |
| 4 | * Copyright (C) 2014 Marvell |
| 5 | * |
| 6 | * Gregory CLEMENT <gregory.clement@free-electrons.com> |
| 7 | * |
| 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. |
| 11 | * |
| 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. |
| 15 | */ |
| 16 | |
| 17 | #include <dt-bindings/phy/phy.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/io.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/of_address.h> |
| 23 | #include <linux/phy/phy.h> |
| 24 | #include <linux/platform_device.h> |
| 25 | |
| 26 | #define USB2_PHY_CONFIG_DISABLE BIT(0) |
| 27 | |
| 28 | struct armada375_cluster_phy { |
| 29 | struct phy *phy; |
| 30 | void __iomem *reg; |
| 31 | bool use_usb3; |
| 32 | int phy_provided; |
| 33 | }; |
| 34 | |
| 35 | static int armada375_usb_phy_init(struct phy *phy) |
| 36 | { |
| 37 | struct armada375_cluster_phy *cluster_phy; |
| 38 | u32 reg; |
| 39 | |
Axel Lin | 7a83b14 | 2015-02-26 07:24:49 +0800 | [diff] [blame] | 40 | cluster_phy = phy_get_drvdata(phy); |
Gregory CLEMENT | eee4753 | 2014-11-13 12:47:46 +0100 | [diff] [blame] | 41 | if (!cluster_phy) |
| 42 | return -ENODEV; |
| 43 | |
| 44 | reg = readl(cluster_phy->reg); |
| 45 | if (cluster_phy->use_usb3) |
| 46 | reg |= USB2_PHY_CONFIG_DISABLE; |
| 47 | else |
| 48 | reg &= ~USB2_PHY_CONFIG_DISABLE; |
| 49 | writel(reg, cluster_phy->reg); |
| 50 | |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | static struct phy_ops armada375_usb_phy_ops = { |
| 55 | .init = armada375_usb_phy_init, |
| 56 | .owner = THIS_MODULE, |
| 57 | }; |
| 58 | |
| 59 | /* |
| 60 | * Only one controller can use this PHY. We shouldn't have the case |
| 61 | * when two controllers want to use this PHY. But if this case occurs |
| 62 | * then we provide a phy to the first one and return an error for the |
| 63 | * next one. This error has also to be an error returned by |
| 64 | * devm_phy_optional_get() so different from ENODEV for USB2. In the |
| 65 | * USB3 case it still optional and we use ENODEV. |
| 66 | */ |
| 67 | static struct phy *armada375_usb_phy_xlate(struct device *dev, |
| 68 | struct of_phandle_args *args) |
| 69 | { |
| 70 | struct armada375_cluster_phy *cluster_phy = dev_get_drvdata(dev); |
| 71 | |
| 72 | if (!cluster_phy) |
| 73 | return ERR_PTR(-ENODEV); |
| 74 | |
| 75 | /* |
| 76 | * Either the phy had never been requested and then the first |
| 77 | * usb claiming it can get it, or it had already been |
| 78 | * requested in this case, we only allow to use it with the |
| 79 | * same configuration. |
| 80 | */ |
| 81 | if (WARN_ON((cluster_phy->phy_provided != PHY_NONE) && |
| 82 | (cluster_phy->phy_provided != args->args[0]))) { |
| 83 | dev_err(dev, "This PHY has already been provided!\n"); |
| 84 | dev_err(dev, "Check your device tree, only one controller can use it\n."); |
| 85 | if (args->args[0] == PHY_TYPE_USB2) |
| 86 | return ERR_PTR(-EBUSY); |
| 87 | else |
| 88 | return ERR_PTR(-ENODEV); |
| 89 | } |
| 90 | |
| 91 | if (args->args[0] == PHY_TYPE_USB2) |
| 92 | cluster_phy->use_usb3 = false; |
| 93 | else if (args->args[0] == PHY_TYPE_USB3) |
| 94 | cluster_phy->use_usb3 = true; |
| 95 | else { |
| 96 | dev_err(dev, "Invalid PHY mode\n"); |
| 97 | return ERR_PTR(-ENODEV); |
| 98 | } |
| 99 | |
| 100 | /* Store which phy mode is used for next test */ |
| 101 | cluster_phy->phy_provided = args->args[0]; |
| 102 | |
| 103 | return cluster_phy->phy; |
| 104 | } |
| 105 | |
| 106 | static int armada375_usb_phy_probe(struct platform_device *pdev) |
| 107 | { |
| 108 | struct device *dev = &pdev->dev; |
| 109 | struct phy *phy; |
| 110 | struct phy_provider *phy_provider; |
| 111 | void __iomem *usb_cluster_base; |
| 112 | struct resource *res; |
| 113 | struct armada375_cluster_phy *cluster_phy; |
| 114 | |
| 115 | cluster_phy = devm_kzalloc(dev, sizeof(*cluster_phy), GFP_KERNEL); |
| 116 | if (!cluster_phy) |
| 117 | return -ENOMEM; |
| 118 | |
| 119 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 120 | usb_cluster_base = devm_ioremap_resource(&pdev->dev, res); |
Wei Yongjun | 147fd9d | 2015-01-14 09:10:00 +0800 | [diff] [blame] | 121 | if (IS_ERR(usb_cluster_base)) |
| 122 | return PTR_ERR(usb_cluster_base); |
Gregory CLEMENT | eee4753 | 2014-11-13 12:47:46 +0100 | [diff] [blame] | 123 | |
| 124 | phy = devm_phy_create(dev, NULL, &armada375_usb_phy_ops); |
| 125 | if (IS_ERR(phy)) { |
| 126 | dev_err(dev, "failed to create PHY\n"); |
| 127 | return PTR_ERR(phy); |
| 128 | } |
| 129 | |
| 130 | cluster_phy->phy = phy; |
| 131 | cluster_phy->reg = usb_cluster_base; |
| 132 | |
| 133 | dev_set_drvdata(dev, cluster_phy); |
Axel Lin | 7a83b14 | 2015-02-26 07:24:49 +0800 | [diff] [blame] | 134 | phy_set_drvdata(phy, cluster_phy); |
Gregory CLEMENT | eee4753 | 2014-11-13 12:47:46 +0100 | [diff] [blame] | 135 | |
| 136 | phy_provider = devm_of_phy_provider_register(&pdev->dev, |
| 137 | armada375_usb_phy_xlate); |
| 138 | return PTR_ERR_OR_ZERO(phy_provider); |
| 139 | } |
| 140 | |
| 141 | static const struct of_device_id of_usb_cluster_table[] = { |
| 142 | { .compatible = "marvell,armada-375-usb-cluster", }, |
| 143 | { /* end of list */ }, |
| 144 | }; |
| 145 | MODULE_DEVICE_TABLE(of, of_usb_cluster_table); |
| 146 | |
| 147 | static struct platform_driver armada375_usb_phy_driver = { |
| 148 | .probe = armada375_usb_phy_probe, |
| 149 | .driver = { |
| 150 | .of_match_table = of_usb_cluster_table, |
| 151 | .name = "armada-375-usb-cluster", |
| 152 | .owner = THIS_MODULE, |
| 153 | } |
| 154 | }; |
| 155 | module_platform_driver(armada375_usb_phy_driver); |
| 156 | |
| 157 | MODULE_DESCRIPTION("Armada 375 USB cluster driver"); |
| 158 | MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>"); |
| 159 | MODULE_LICENSE("GPL"); |