--- /dev/null
+/*
+ * SAMSUNG EXYNOS USB HOST OHCI Controller
+ *
+ * Copyright (C) 2011 Samsung Electronics Co.Ltd
+ * Author: Jingoo Han <jg1.han@samsung.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.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/phy/phy.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+#include "ohci.h"
+
+#define DRIVER_DESC "OHCI EXYNOS driver"
+
+static const char hcd_name[] = "ohci-exynos";
+static struct hc_driver __read_mostly exynos_ohci_hc_driver;
+
+#define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
+
+#define PHY_NUMBER 3
+
+struct exynos_ohci_hcd {
+ struct clk *clk;
+ struct phy *phy[PHY_NUMBER];
+};
+
+static int exynos_ohci_get_phy(struct device *dev,
+ struct exynos_ohci_hcd *exynos_ohci)
+{
+ struct device_node *child;
+ struct phy *phy;
+ int phy_number;
+ int ret;
+
+ /* Get PHYs for the controller */
+ for_each_available_child_of_node(dev->of_node, child) {
+ ret = of_property_read_u32(child, "reg", &phy_number);
+ if (ret) {
+ dev_err(dev, "Failed to parse device tree\n");
+ of_node_put(child);
+ return ret;
+ }
+
+ if (phy_number >= PHY_NUMBER) {
+ dev_err(dev, "Invalid number of PHYs\n");
+ of_node_put(child);
+ return -EINVAL;
+ }
+
+ phy = devm_of_phy_get(dev, child, NULL);
+ exynos_ohci->phy[phy_number] = phy;
+ if (IS_ERR(phy)) {
+ ret = PTR_ERR(phy);
+ if (ret == -EPROBE_DEFER) {
+ return ret;
+ } else if (ret != -ENOSYS && ret != -ENODEV) {
+ dev_err(dev,
+ "Error retrieving usb2 phy: %d\n", ret);
+ return ret;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int exynos_ohci_phy_enable(struct device *dev)
+{
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
+ int i;
+ int ret = 0;
+
+ for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
+ if (!IS_ERR(exynos_ohci->phy[i]))
+ ret = phy_power_on(exynos_ohci->phy[i]);
+ if (ret)
+ for (i--; i >= 0; i--)
+ if (!IS_ERR(exynos_ohci->phy[i]))
+ phy_power_off(exynos_ohci->phy[i]);
+
+ return ret;
+}
+
+static void exynos_ohci_phy_disable(struct device *dev)
+{
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
+ int i;
+
+ for (i = 0; i < PHY_NUMBER; i++)
+ if (!IS_ERR(exynos_ohci->phy[i]))
+ phy_power_off(exynos_ohci->phy[i]);
+}
+
+static int exynos_ohci_probe(struct platform_device *pdev)
+{
+ struct exynos_ohci_hcd *exynos_ohci;
+ struct usb_hcd *hcd;
+ struct resource *res;
+ int irq;
+ int err;
+
+ /*
+ * Right now device-tree probed devices don't get dma_mask set.
+ * Since shared usb code relies on it, set it here for now.
+ * Once we move to full device tree support this will vanish off.
+ */
+ err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+ if (err)
+ return err;
+
+ hcd = usb_create_hcd(&exynos_ohci_hc_driver,
+ &pdev->dev, dev_name(&pdev->dev));
+ if (!hcd) {
+ dev_err(&pdev->dev, "Unable to create HCD\n");
+ return -ENOMEM;
+ }
+
+ exynos_ohci = to_exynos_ohci(hcd);
+
+ if (of_device_is_compatible(pdev->dev.of_node,
+ "samsung,exynos5440-ohci"))
+ goto skip_phy;
+
+ err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci);
+ if (err)
+ goto fail_clk;
+
+skip_phy:
+ exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
+
+ if (IS_ERR(exynos_ohci->clk)) {
+ dev_err(&pdev->dev, "Failed to get usbhost clock\n");
+ err = PTR_ERR(exynos_ohci->clk);
+ goto fail_clk;
+ }
+
+ err = clk_prepare_enable(exynos_ohci->clk);
+ if (err)
+ goto fail_clk;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ hcd->regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(hcd->regs)) {
+ err = PTR_ERR(hcd->regs);
+ goto fail_io;
+ }
+ hcd->rsrc_start = res->start;
+ hcd->rsrc_len = resource_size(res);
+
+ irq = platform_get_irq(pdev, 0);
+ if (!irq) {
+ dev_err(&pdev->dev, "Failed to get IRQ\n");
+ err = -ENODEV;
+ goto fail_io;
+ }
+
+ platform_set_drvdata(pdev, hcd);
+
+ err = exynos_ohci_phy_enable(&pdev->dev);
+ if (err) {
+ dev_err(&pdev->dev, "Failed to enable USB phy\n");
+ goto fail_io;
+ }
+
+ err = usb_add_hcd(hcd, irq, IRQF_SHARED);
+ if (err) {
+ dev_err(&pdev->dev, "Failed to add USB HCD\n");
+ goto fail_add_hcd;
+ }
+ device_wakeup_enable(hcd->self.controller);
+ return 0;
+
+fail_add_hcd:
+ exynos_ohci_phy_disable(&pdev->dev);
+fail_io:
+ clk_disable_unprepare(exynos_ohci->clk);
+fail_clk:
+ usb_put_hcd(hcd);
+ return err;
+}
+
+static int exynos_ohci_remove(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
+
+ usb_remove_hcd(hcd);
+
+ exynos_ohci_phy_disable(&pdev->dev);
+
+ clk_disable_unprepare(exynos_ohci->clk);
+
+ usb_put_hcd(hcd);
+
+ return 0;
+}
+
+static void exynos_ohci_shutdown(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+ if (hcd->driver->shutdown)
+ hcd->driver->shutdown(hcd);
+}
+
+#ifdef CONFIG_PM
+static int exynos_ohci_suspend(struct device *dev)
+{
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
+ bool do_wakeup = device_may_wakeup(dev);
+ int rc = ohci_suspend(hcd, do_wakeup);
+
+ if (rc)
+ return rc;
+
+ exynos_ohci_phy_disable(dev);
+
+ clk_disable_unprepare(exynos_ohci->clk);
+
+ return 0;
+}
+
+static int exynos_ohci_resume(struct device *dev)
+{
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
+ int ret;
+
+ clk_prepare_enable(exynos_ohci->clk);
+
+ ret = exynos_ohci_phy_enable(dev);
+ if (ret) {
+ dev_err(dev, "Failed to enable USB phy\n");
+ clk_disable_unprepare(exynos_ohci->clk);
+ return ret;
+ }
+
+ ohci_resume(hcd, false);
+
+ return 0;
+}
+#else
+#define exynos_ohci_suspend NULL
+#define exynos_ohci_resume NULL
+#endif
+
+static const struct ohci_driver_overrides exynos_overrides __initconst = {
+ .extra_priv_size = sizeof(struct exynos_ohci_hcd),
+};
+
+static const struct dev_pm_ops exynos_ohci_pm_ops = {
+ .suspend = exynos_ohci_suspend,
+ .resume = exynos_ohci_resume,
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id exynos_ohci_match[] = {
+ { .compatible = "samsung,exynos4210-ohci" },
+ { .compatible = "samsung,exynos5440-ohci" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, exynos_ohci_match);
+#endif
+
+static struct platform_driver exynos_ohci_driver = {
+ .probe = exynos_ohci_probe,
+ .remove = exynos_ohci_remove,
+ .shutdown = exynos_ohci_shutdown,
+ .driver = {
+ .name = "exynos-ohci",
+ .pm = &exynos_ohci_pm_ops,
+ .of_match_table = of_match_ptr(exynos_ohci_match),
+ }
+};
+static int __init ohci_exynos_init(void)
+{
+ if (usb_disabled())
+ return -ENODEV;
+
+ pr_info("%s: " DRIVER_DESC "\n", hcd_name);
+ ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides);
+ return platform_driver_register(&exynos_ohci_driver);
+}
+module_init(ohci_exynos_init);
+
+static void __exit ohci_exynos_cleanup(void)
+{
+ platform_driver_unregister(&exynos_ohci_driver);
+}
+module_exit(ohci_exynos_cleanup);
+
+MODULE_ALIAS("platform:exynos-ohci");
+MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
+MODULE_LICENSE("GPL v2");
Code Review / kvmfornfv.git / blobdiff