/* * xhci-plat.c - xHCI host controller driver platform Bus Glue. * * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com * Author: Sebastian Andrzej Siewior * * A lot of code borrowed from the Linux xHCI driver. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. */ #include #include #include #include #include #include "xhci.h" static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci) { /* * As of now platform drivers don't provide MSI support so we ensure * here that the generic code does not try to make a pci_dev from our * dev struct in order to setup MSI */ xhci->quirks |= XHCI_PLAT; } /* called during probe() after chip reset completes */ static int xhci_plat_setup(struct usb_hcd *hcd) { return xhci_gen_setup(hcd, xhci_plat_quirks); } static const struct hc_driver xhci_plat_xhci_driver = { .description = "xhci-hcd", .product_desc = "xHCI Host Controller", .hcd_priv_size = sizeof(struct xhci_hcd *), /* * generic hardware linkage */ .irq = xhci_irq, .flags = HCD_MEMORY | HCD_USB3 | HCD_SHARED, /* * basic lifecycle operations */ .reset = xhci_plat_setup, .start = xhci_run, .stop = xhci_stop, .shutdown = xhci_shutdown, /* * managing i/o requests and associated device resources */ .urb_enqueue = xhci_urb_enqueue, .urb_dequeue = xhci_urb_dequeue, .alloc_dev = xhci_alloc_dev, .free_dev = xhci_free_dev, .alloc_streams = xhci_alloc_streams, .free_streams = xhci_free_streams, .add_endpoint = xhci_add_endpoint, .drop_endpoint = xhci_drop_endpoint, .endpoint_reset = xhci_endpoint_reset, .check_bandwidth = xhci_check_bandwidth, .reset_bandwidth = xhci_reset_bandwidth, .address_device = xhci_address_device, .enable_device = xhci_enable_device, .update_hub_device = xhci_update_hub_device, .reset_device = xhci_discover_or_reset_device, /* * scheduling support */ .get_frame_number = xhci_get_frame, /* Root hub support */ .hub_control = xhci_hub_control, .hub_status_data = xhci_hub_status_data, .bus_suspend = xhci_bus_suspend, .bus_resume = xhci_bus_resume, }; static int xhci_plat_probe(struct platform_device *pdev) { const struct hc_driver *driver; struct xhci_hcd *xhci; struct resource *res; struct usb_hcd *hcd; int ret; int irq; if (usb_disabled()) return -ENODEV; driver = &xhci_plat_xhci_driver; irq = platform_get_irq(pdev, 0); if (irq < 0) return -ENODEV; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -ENODEV; /* Initialize dma_mask and coherent_dma_mask to 32-bits */ ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); if (ret) return ret; if (!pdev->dev.dma_mask) pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; else dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); if (!hcd) return -ENOMEM; hcd->rsrc_start = res->start; hcd->rsrc_len = resource_size(res); if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, driver->description)) { dev_dbg(&pdev->dev, "controller already in use\n"); ret = -EBUSY; goto put_hcd; } hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len); if (!hcd->regs) { dev_dbg(&pdev->dev, "error mapping memory\n"); ret = -EFAULT; goto release_mem_region; } ret = usb_add_hcd(hcd, irq, IRQF_SHARED); if (ret) goto unmap_registers; device_wakeup_enable(hcd->self.controller); /* USB 2.0 roothub is stored in the platform_device now. */ hcd = platform_get_drvdata(pdev); xhci = hcd_to_xhci(hcd); xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev, dev_name(&pdev->dev), hcd); if (!xhci->shared_hcd) { ret = -ENOMEM; goto dealloc_usb2_hcd; } /* * Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset) * is called by usb_add_hcd(). */ *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci; ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED); if (ret) goto put_usb3_hcd; return 0; put_usb3_hcd: usb_put_hcd(xhci->shared_hcd); dealloc_usb2_hcd: usb_remove_hcd(hcd); unmap_registers: iounmap(hcd->regs); release_mem_region: release_mem_region(hcd->rsrc_start, hcd->rsrc_len); put_hcd: usb_put_hcd(hcd); return ret; } static int xhci_plat_remove(struct platform_device *dev) { struct usb_hcd *hcd = platform_get_drvdata(dev); struct xhci_hcd *xhci = hcd_to_xhci(hcd); usb_remove_hcd(xhci->shared_hcd); usb_put_hcd(xhci->shared_hcd); usb_remove_hcd(hcd); iounmap(hcd->regs); release_mem_region(hcd->rsrc_start, hcd->rsrc_len); usb_put_hcd(hcd); kfree(xhci); return 0; } #ifdef CONFIG_PM static int xhci_plat_suspend(struct device *dev) { struct usb_hcd *hcd = dev_get_drvdata(dev); struct xhci_hcd *xhci = hcd_to_xhci(hcd); /* * xhci_suspend() needs `do_wakeup` to know whether host is allowed * to do wakeup during suspend. Since xhci_plat_suspend is currently * only designed for system suspend, device_may_wakeup() is enough * to dertermine whether host is allowed to do wakeup. Need to * reconsider this when xhci_plat_suspend enlarges its scope, e.g., * also applies to runtime suspend. */ return xhci_suspend(xhci, device_may_wakeup(dev)); } static int xhci_plat_resume(struct device *dev) { struct usb_hcd *hcd = dev_get_drvdata(dev); struct xhci_hcd *xhci = hcd_to_xhci(hcd); return xhci_resume(xhci, 0); } static const struct dev_pm_ops xhci_plat_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume) }; #define DEV_PM_OPS (&xhci_plat_pm_ops) #else #define DEV_PM_OPS NULL #endif /* CONFIG_PM */ #ifdef CONFIG_OF static const struct of_device_id usb_xhci_of_match[] = { { .compatible = "xhci-platform" }, { }, }; MODULE_DEVICE_TABLE(of, usb_xhci_of_match); #endif static struct platform_driver usb_xhci_driver = { .probe = xhci_plat_probe, .remove = xhci_plat_remove, .driver = { .name = "xhci-hcd", .pm = DEV_PM_OPS, .of_match_table = of_match_ptr(usb_xhci_of_match), }, }; MODULE_ALIAS("platform:xhci-hcd"); int xhci_register_plat(void) { return platform_driver_register(&usb_xhci_driver); } void xhci_unregister_plat(void) { platform_driver_unregister(&usb_xhci_driver); }