summaryrefslogtreecommitdiffstats
path: root/drivers/usb/phy/omap-usb2.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/usb/phy/omap-usb2.c')
-rw-r--r--drivers/usb/phy/omap-usb2.c271
1 files changed, 271 insertions, 0 deletions
diff --git a/drivers/usb/phy/omap-usb2.c b/drivers/usb/phy/omap-usb2.c
new file mode 100644
index 000000000000..15ab3d6f2e8c
--- /dev/null
+++ b/drivers/usb/phy/omap-usb2.c
@@ -0,0 +1,271 @@
+/*
+ * 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>
+
+/**
+ * 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);
+
+/**
+ * omap_usb_phy_power - power on/off the phy using control module reg
+ * @phy: struct omap_usb *
+ * @on: 0 or 1, based on powering on or off the PHY
+ *
+ * XXX: Remove this function once control module driver gets merged
+ */
+static void omap_usb_phy_power(struct omap_usb *phy, int on)
+{
+ u32 val;
+
+ if (on) {
+ val = readl(phy->control_dev);
+ if (val & PHY_PD) {
+ writel(~PHY_PD, phy->control_dev);
+ /* XXX: add proper documentation for this delay */
+ mdelay(200);
+ }
+ } else {
+ writel(PHY_PD, phy->control_dev);
+ }
+}
+
+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_usb_phy_power(phy, 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_usb_phy_power(phy, 1);
+ phy->is_suspended = 0;
+ }
+
+ return 0;
+}
+
+static int __devinit omap_usb2_probe(struct platform_device *pdev)
+{
+ struct omap_usb *phy;
+ struct usb_otg *otg;
+ struct resource *res;
+
+ 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;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+
+ phy->control_dev = devm_request_and_ioremap(&pdev->dev, res);
+ if (phy->control_dev == NULL) {
+ dev_err(&pdev->dev, "Failed to obtain io memory\n");
+ return -ENXIO;
+ }
+
+ phy->is_suspended = 1;
+ omap_usb_phy_power(phy, 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);
+
+ usb_add_phy(&phy->phy, USB_PHY_TYPE_USB2);
+
+ platform_set_drvdata(pdev, phy);
+
+ pm_runtime_enable(phy->dev);
+
+ return 0;
+}
+
+static int __devexit omap_usb2_remove(struct platform_device *pdev)
+{
+ struct omap_usb *phy = platform_get_drvdata(pdev);
+
+ clk_unprepare(phy->wkupclk);
+ 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);
+
+ 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);
+
+ 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 = __devexit_p(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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-16 22:43:57 +0100