/* * 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"); ed more than once (the GICv3 ITS, for example, uses the activate callback to issue the MAPVI command, and the architecture spec says that "If there is an existing mapping for the EventID-DeviceID combination, behavior is UNPREDICTABLE"). While this could be worked around in each individual driver, it may make more sense to tackle the issue at the core level. In order to avoid getting in that situation, let's have a per-interrupt flag to remember if we have already activated that interrupt or not. Fixes: f3b0946d629c ("genirq/msi: Make sure PCI MSIs are activated early") Reported-and-tested-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/1484668848-24361-1-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/dt-bindings/clock/r8a7743-cpg-mssr.h')