/* * Generic UHCI HCD (Host Controller Driver) for Platform Devices * * Copyright (c) 2011 Tony Prisk <linux@prisktech.co.nz> * * This file is based on uhci-grlib.c * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu */ #include <linux/of.h> #include <linux/device.h> #include <linux/platform_device.h> static int uhci_platform_init(struct usb_hcd *hcd) { struct uhci_hcd *uhci = hcd_to_uhci(hcd); uhci->rh_numports = uhci_count_ports(hcd); /* Set up pointers to to generic functions */ uhci->reset_hc = uhci_generic_reset_hc; uhci->check_and_reset_hc = uhci_generic_check_and_reset_hc; /* No special actions need to be taken for the functions below */ uhci->configure_hc = NULL; uhci->resume_detect_interrupts_are_broken = NULL; uhci->global_suspend_mode_is_broken = NULL; /* Reset if the controller isn't already safely quiescent. */ check_and_reset_hc(uhci); return 0; } static const struct hc_driver uhci_platform_hc_driver = { .description = hcd_name, .product_desc = "Generic UHCI Host Controller", .hcd_priv_size = sizeof(struct uhci_hcd), /* Generic hardware linkage */ .irq = uhci_irq, .flags = HCD_MEMORY | HCD_USB11, /* Basic lifecycle operations */ .reset = uhci_platform_init, .start = uhci_start, #ifdef CONFIG_PM .pci_suspend = NULL, .pci_resume = NULL, .bus_suspend = uhci_rh_suspend, .bus_resume = uhci_rh_resume, #endif .stop = uhci_stop, .urb_enqueue = uhci_urb_enqueue, .urb_dequeue = uhci_urb_dequeue, .endpoint_disable = uhci_hcd_endpoint_disable, .get_frame_number = uhci_hcd_get_frame_number, .hub_status_data = uhci_hub_status_data, .hub_control = uhci_hub_control, }; static int uhci_hcd_platform_probe(struct platform_device *pdev) { struct usb_hcd *hcd; struct uhci_hcd *uhci; struct resource *res; int ret; if (usb_disabled()) return -ENODEV; /* * 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 have dma capability bindings this can go away. */ ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); if (ret) return ret; hcd = usb_create_hcd(&uhci_platform_hc_driver, &pdev->dev, pdev->name); if (!hcd) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); hcd->regs = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(hcd->regs)) { ret = PTR_ERR(hcd->regs); goto err_rmr; } hcd->rsrc_start = res->start; hcd->rsrc_len = resource_size(res); uhci = hcd_to_uhci(hcd); uhci->regs = hcd->regs; ret = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED); if (ret) goto err_rmr; device_wakeup_enable(hcd->self.controller); return 0; err_rmr: usb_put_hcd(hcd); return ret; } static int uhci_hcd_platform_remove(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); usb_remove_hcd(hcd); usb_put_hcd(hcd); return 0; } /* Make sure the controller is quiescent and that we're not using it * any more. This is mainly for the benefit of programs which, like kexec, * expect the hardware to be idle: not doing DMA or generating IRQs. * * This routine may be called in a damaged or failing kernel. Hence we * do not acquire the spinlock before shutting down the controller. */ static void uhci_hcd_platform_shutdown(struct platform_device *op) { struct usb_hcd *hcd = platform_get_drvdata(op); uhci_hc_died(hcd_to_uhci(hcd)); } static const struct of_device_id platform_uhci_ids[] = { { .compatible = "generic-uhci", }, { .compatible = "platform-uhci", }, {} }; MODULE_DEVICE_TABLE(of, platform_uhci_ids); static struct platform_driver uhci_platform_driver = { .probe = uhci_hcd_platform_probe, .remove = uhci_hcd_platform_remove, .shutdown = uhci_hcd_platform_shutdown, .driver = { .name = "platform-uhci", .of_match_table = platform_uhci_ids, }, };