1 files changed, 273 insertions, 0 deletions

diff --git a/drivers/usb/phy/phy-omap-usb2.c b/drivers/usb/phy/phy-omap-usb2.c
new file mode 100644
index 000000000000..844ab68f08d0
--- /dev/null
+++ b/drivers/usb/phy/phy-omap-usb2.c
@@ -0,0 +1,273 @@
+/*
+ * omap-usb2.c - USB PHY, talking to musb controller in OMAP.
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Author: Kishon Vijay Abraham I <kishon@ti.com>
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/io.h>
+#include <linux/usb/omap_usb.h>
+#include <linux/usb/phy_companion.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/pm_runtime.h>
+#include <linux/delay.h>
+#include <linux/usb/omap_control_usb.h>
+
+/**
+ * omap_usb2_set_comparator - links the comparator present in the sytem with
+ *      this phy
+ * @comparator - the companion phy(comparator) for this phy
+ *
+ * The phy companion driver should call this API passing the phy_companion
+ * filled with set_vbus and start_srp to be used by usb phy.
+ *
+ * For use by phy companion driver
+ */
+int omap_usb2_set_comparator(struct phy_companion *comparator)
+{
+        struct omap_usb *phy;
+        struct usb_phy  *x = usb_get_phy(USB_PHY_TYPE_USB2);
+
+        if (IS_ERR(x))
+                return -ENODEV;
+
+        phy = phy_to_omapusb(x);
+        phy->comparator = comparator;
+        return 0;
+}
+EXPORT_SYMBOL_GPL(omap_usb2_set_comparator);
+
+static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled)
+{
+        struct omap_usb *phy = phy_to_omapusb(otg->phy);
+
+        if (!phy->comparator)
+                return -ENODEV;
+
+        return phy->comparator->set_vbus(phy->comparator, enabled);
+}
+
+static int omap_usb_start_srp(struct usb_otg *otg)
+{
+        struct omap_usb *phy = phy_to_omapusb(otg->phy);
+
+        if (!phy->comparator)
+                return -ENODEV;
+
+        return phy->comparator->start_srp(phy->comparator);
+}
+
+static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
+{
+        struct usb_phy  *phy = otg->phy;
+
+        otg->host = host;
+        if (!host)
+                phy->state = OTG_STATE_UNDEFINED;
+
+        return 0;
+}
+
+static int omap_usb_set_peripheral(struct usb_otg *otg,
+                struct usb_gadget *gadget)
+{
+        struct usb_phy  *phy = otg->phy;
+
+        otg->gadget = gadget;
+        if (!gadget)
+                phy->state = OTG_STATE_UNDEFINED;
+
+        return 0;
+}
+
+static int omap_usb2_suspend(struct usb_phy *x, int suspend)
+{
+        u32 ret;
+        struct omap_usb *phy = phy_to_omapusb(x);
+
+        if (suspend && !phy->is_suspended) {
+                omap_control_usb_phy_power(phy->control_dev, 0);
+                pm_runtime_put_sync(phy->dev);
+                phy->is_suspended = 1;
+        } else if (!suspend && phy->is_suspended) {
+                ret = pm_runtime_get_sync(phy->dev);
+                if (ret < 0) {
+                        dev_err(phy->dev, "get_sync failed with err %d\n",
+                                                                        ret);
+                        return ret;
+                }
+                omap_control_usb_phy_power(phy->control_dev, 1);
+                phy->is_suspended = 0;
+        }
+
+        return 0;
+}
+
+static int omap_usb2_probe(struct platform_device *pdev)
+{
+        struct omap_usb                 *phy;
+        struct usb_otg                  *otg;
+
+        phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
+        if (!phy) {
+                dev_err(&pdev->dev, "unable to allocate memory for USB2 PHY\n");
+                return -ENOMEM;
+        }
+
+        otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
+        if (!otg) {
+                dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n");
+                return -ENOMEM;
+        }
+
+        phy->dev                = &pdev->dev;
+
+        phy->phy.dev            = phy->dev;
+        phy->phy.label          = "omap-usb2";
+        phy->phy.set_suspend    = omap_usb2_suspend;
+        phy->phy.otg            = otg;
+        phy->phy.type           = USB_PHY_TYPE_USB2;
+
+        phy->control_dev = omap_get_control_dev();
+        if (IS_ERR(phy->control_dev)) {
+                dev_dbg(&pdev->dev, "Failed to get control device\n");
+                return -ENODEV;
+        }
+
+        phy->is_suspended       = 1;
+        omap_control_usb_phy_power(phy->control_dev, 0);
+
+        otg->set_host           = omap_usb_set_host;
+        otg->set_peripheral     = omap_usb_set_peripheral;
+        otg->set_vbus           = omap_usb_set_vbus;
+        otg->start_srp          = omap_usb_start_srp;
+        otg->phy                = &phy->phy;
+
+        phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
+        if (IS_ERR(phy->wkupclk)) {
+                dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
+                return PTR_ERR(phy->wkupclk);
+        }
+        clk_prepare(phy->wkupclk);
+
+        phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
+        if (IS_ERR(phy->optclk))
+                dev_vdbg(&pdev->dev, "unable to get refclk960m\n");
+        else
+                clk_prepare(phy->optclk);
+
+        usb_add_phy_dev(&phy->phy);
+
+        platform_set_drvdata(pdev, phy);
+
+        pm_runtime_enable(phy->dev);
+
+        return 0;
+}
+
+static int omap_usb2_remove(struct platform_device *pdev)
+{
+        struct omap_usb *phy = platform_get_drvdata(pdev);
+
+        clk_unprepare(phy->wkupclk);
+        if (!IS_ERR(phy->optclk))
+                clk_unprepare(phy->optclk);
+        usb_remove_phy(&phy->phy);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM_RUNTIME
+
+static int omap_usb2_runtime_suspend(struct device *dev)
+{
+        struct platform_device  *pdev = to_platform_device(dev);
+        struct omap_usb *phy = platform_get_drvdata(pdev);
+
+        clk_disable(phy->wkupclk);
+        if (!IS_ERR(phy->optclk))
+                clk_disable(phy->optclk);
+
+        return 0;
+}
+
+static int omap_usb2_runtime_resume(struct device *dev)
+{
+        u32 ret = 0;
+        struct platform_device  *pdev = to_platform_device(dev);
+        struct omap_usb *phy = platform_get_drvdata(pdev);
+
+        ret = clk_enable(phy->wkupclk);
+        if (ret < 0) {
+                dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
+                goto err0;
+        }
+
+        if (!IS_ERR(phy->optclk)) {
+                ret = clk_enable(phy->optclk);
+                if (ret < 0) {
+                        dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
+                        goto err1;
+                }
+        }
+
+        return 0;
+
+err1:
+        clk_disable(phy->wkupclk);
+
+err0:
+        return ret;
+}
+
+static const struct dev_pm_ops omap_usb2_pm_ops = {
+        SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume,
+                NULL)
+};
+
+#define DEV_PM_OPS     (&omap_usb2_pm_ops)
+#else
+#define DEV_PM_OPS     NULL
+#endif
+
+#ifdef CONFIG_OF
+static const struct of_device_id omap_usb2_id_table[] = {
+        { .compatible = "ti,omap-usb2" },
+        {}
+};
+MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
+#endif
+
+static struct platform_driver omap_usb2_driver = {
+        .probe          = omap_usb2_probe,
+        .remove         = omap_usb2_remove,
+        .driver         = {
+                .name   = "omap-usb2",
+                .owner  = THIS_MODULE,
+                .pm     = DEV_PM_OPS,
+                .of_match_table = of_match_ptr(omap_usb2_id_table),
+        },
+};
+
+module_platform_driver(omap_usb2_driver);
+
+MODULE_ALIAS("platform: omap_usb2");
+MODULE_AUTHOR("Texas Instruments Inc.");
+MODULE_DESCRIPTION("OMAP USB2 phy driver");
+MODULE_LICENSE("GPL v2");