/* * SAMSUNG EXYNOS USB HOST OHCI Controller * * Copyright (C) 2011 Samsung Electronics Co.Ltd * Author: Jingoo Han * * 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 #include #include #include #include #include #include #include #include #include #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 "); MODULE_LICENSE("GPL v2");