1 files changed, 158 insertions, 0 deletions

diff --git a/drivers/phy/phy-armada375-usb2.c b/drivers/phy/phy-armada375-usb2.c
new file mode 100644
index 000000000000..ac7d99d01cb3
--- /dev/null
+++ b/drivers/phy/phy-armada375-usb2.c
@@ -0,0 +1,158 @@
+/*
+ * USB cluster support for Armada 375 platform.
+ *
+ * Copyright (C) 2014 Marvell
+ *
+ * Gregory CLEMENT <gregory.clement@free-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2 or later. This program is licensed "as is"
+ * without any warranty of any kind, whether express or implied.
+ *
+ * Armada 375 comes with an USB2 host and device controller and an
+ * USB3 controller. The USB cluster control register allows to manage
+ * common features of both USB controllers.
+ */
+
+#include <dt-bindings/phy/phy.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+
+#define USB2_PHY_CONFIG_DISABLE BIT(0)
+
+struct armada375_cluster_phy {
+        struct phy *phy;
+        void __iomem *reg;
+        bool use_usb3;
+        int phy_provided;
+};
+
+static int armada375_usb_phy_init(struct phy *phy)
+{
+        struct armada375_cluster_phy *cluster_phy;
+        u32 reg;
+
+        cluster_phy = dev_get_drvdata(phy->dev.parent);
+        if (!cluster_phy)
+                return -ENODEV;
+
+        reg = readl(cluster_phy->reg);
+        if (cluster_phy->use_usb3)
+                reg |= USB2_PHY_CONFIG_DISABLE;
+        else
+                reg &= ~USB2_PHY_CONFIG_DISABLE;
+        writel(reg, cluster_phy->reg);
+
+        return 0;
+}
+
+static struct phy_ops armada375_usb_phy_ops = {
+        .init = armada375_usb_phy_init,
+        .owner = THIS_MODULE,
+};
+
+/*
+ * Only one controller can use this PHY. We shouldn't have the case
+ * when two controllers want to use this PHY. But if this case occurs
+ * then we provide a phy to the first one and return an error for the
+ * next one. This error has also to be an error returned by
+ * devm_phy_optional_get() so different from ENODEV for USB2. In the
+ * USB3 case it still optional and we use ENODEV.
+ */
+static struct phy *armada375_usb_phy_xlate(struct device *dev,
+                                        struct of_phandle_args *args)
+{
+        struct armada375_cluster_phy *cluster_phy = dev_get_drvdata(dev);
+
+        if (!cluster_phy)
+                return  ERR_PTR(-ENODEV);
+
+        /*
+         * Either the phy had never been requested and then the first
+         * usb claiming it can get it, or it had already been
+         * requested in this case, we only allow to use it with the
+         * same configuration.
+         */
+        if (WARN_ON((cluster_phy->phy_provided != PHY_NONE) &&
+                        (cluster_phy->phy_provided != args->args[0]))) {
+                dev_err(dev, "This PHY has already been provided!\n");
+                dev_err(dev, "Check your device tree, only one controller can use it\n.");
+                if (args->args[0] == PHY_TYPE_USB2)
+                        return ERR_PTR(-EBUSY);
+                else
+                        return ERR_PTR(-ENODEV);
+        }
+
+        if (args->args[0] == PHY_TYPE_USB2)
+                cluster_phy->use_usb3 = false;
+        else if (args->args[0] == PHY_TYPE_USB3)
+                cluster_phy->use_usb3 = true;
+        else {
+                dev_err(dev, "Invalid PHY mode\n");
+                return ERR_PTR(-ENODEV);
+        }
+
+        /* Store which phy mode is used for next test */
+        cluster_phy->phy_provided = args->args[0];
+
+        return cluster_phy->phy;
+}
+
+static int armada375_usb_phy_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct phy *phy;
+        struct phy_provider *phy_provider;
+        void __iomem *usb_cluster_base;
+        struct resource *res;
+        struct armada375_cluster_phy *cluster_phy;
+
+        cluster_phy = devm_kzalloc(dev, sizeof(*cluster_phy), GFP_KERNEL);
+        if (!cluster_phy)
+                return  -ENOMEM;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        usb_cluster_base = devm_ioremap_resource(&pdev->dev, res);
+        if (!usb_cluster_base)
+                return -ENOMEM;
+
+        phy = devm_phy_create(dev, NULL, &armada375_usb_phy_ops);
+        if (IS_ERR(phy)) {
+                dev_err(dev, "failed to create PHY\n");
+                return PTR_ERR(phy);
+        }
+
+        cluster_phy->phy = phy;
+        cluster_phy->reg = usb_cluster_base;
+
+        dev_set_drvdata(dev, cluster_phy);
+
+        phy_provider = devm_of_phy_provider_register(&pdev->dev,
+                                                     armada375_usb_phy_xlate);
+        return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static const struct of_device_id of_usb_cluster_table[] = {
+        { .compatible = "marvell,armada-375-usb-cluster", },
+        { /* end of list */ },
+};
+MODULE_DEVICE_TABLE(of, of_usb_cluster_table);
+
+static struct platform_driver armada375_usb_phy_driver = {
+        .probe  = armada375_usb_phy_probe,
+        .driver = {
+                .of_match_table = of_usb_cluster_table,
+                .name  = "armada-375-usb-cluster",
+                .owner = THIS_MODULE,
+        }
+};
+module_platform_driver(armada375_usb_phy_driver);
+
+MODULE_DESCRIPTION("Armada 375 USB cluster driver");
+MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
+MODULE_LICENSE("GPL");