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6827f7e311
Fix in accessing NULL if resource didn't get. Signed-off-by: Varka Bhadram <varkab@cdac.in> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
154 lines
3.8 KiB
C
154 lines
3.8 KiB
C
/*
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* Generic UHCI HCD (Host Controller Driver) for Platform Devices
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*
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* Copyright (c) 2011 Tony Prisk <linux@prisktech.co.nz>
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*
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* This file is based on uhci-grlib.c
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* (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
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*/
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#include <linux/of.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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static int uhci_platform_init(struct usb_hcd *hcd)
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{
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struct uhci_hcd *uhci = hcd_to_uhci(hcd);
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uhci->rh_numports = uhci_count_ports(hcd);
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/* Set up pointers to to generic functions */
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uhci->reset_hc = uhci_generic_reset_hc;
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uhci->check_and_reset_hc = uhci_generic_check_and_reset_hc;
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/* No special actions need to be taken for the functions below */
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uhci->configure_hc = NULL;
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uhci->resume_detect_interrupts_are_broken = NULL;
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uhci->global_suspend_mode_is_broken = NULL;
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/* Reset if the controller isn't already safely quiescent. */
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check_and_reset_hc(uhci);
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return 0;
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}
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static const struct hc_driver uhci_platform_hc_driver = {
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.description = hcd_name,
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.product_desc = "Generic UHCI Host Controller",
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.hcd_priv_size = sizeof(struct uhci_hcd),
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/* Generic hardware linkage */
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.irq = uhci_irq,
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.flags = HCD_MEMORY | HCD_USB11,
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/* Basic lifecycle operations */
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.reset = uhci_platform_init,
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.start = uhci_start,
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#ifdef CONFIG_PM
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.pci_suspend = NULL,
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.pci_resume = NULL,
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.bus_suspend = uhci_rh_suspend,
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.bus_resume = uhci_rh_resume,
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#endif
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.stop = uhci_stop,
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.urb_enqueue = uhci_urb_enqueue,
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.urb_dequeue = uhci_urb_dequeue,
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.endpoint_disable = uhci_hcd_endpoint_disable,
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.get_frame_number = uhci_hcd_get_frame_number,
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.hub_status_data = uhci_hub_status_data,
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.hub_control = uhci_hub_control,
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};
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static int uhci_hcd_platform_probe(struct platform_device *pdev)
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{
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struct usb_hcd *hcd;
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struct uhci_hcd *uhci;
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struct resource *res;
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int ret;
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if (usb_disabled())
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return -ENODEV;
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/*
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* Right now device-tree probed devices don't get dma_mask set.
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* Since shared usb code relies on it, set it here for now.
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* Once we have dma capability bindings this can go away.
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*/
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ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
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if (ret)
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return ret;
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hcd = usb_create_hcd(&uhci_platform_hc_driver, &pdev->dev,
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pdev->name);
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if (!hcd)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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hcd->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(hcd->regs)) {
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ret = PTR_ERR(hcd->regs);
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goto err_rmr;
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}
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hcd->rsrc_start = res->start;
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hcd->rsrc_len = resource_size(res);
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uhci = hcd_to_uhci(hcd);
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uhci->regs = hcd->regs;
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ret = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED);
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if (ret)
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goto err_rmr;
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device_wakeup_enable(hcd->self.controller);
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return 0;
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err_rmr:
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usb_put_hcd(hcd);
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return ret;
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}
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static int uhci_hcd_platform_remove(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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usb_remove_hcd(hcd);
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usb_put_hcd(hcd);
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return 0;
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}
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/* Make sure the controller is quiescent and that we're not using it
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* any more. This is mainly for the benefit of programs which, like kexec,
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* expect the hardware to be idle: not doing DMA or generating IRQs.
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*
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* This routine may be called in a damaged or failing kernel. Hence we
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* do not acquire the spinlock before shutting down the controller.
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*/
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static void uhci_hcd_platform_shutdown(struct platform_device *op)
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{
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struct usb_hcd *hcd = platform_get_drvdata(op);
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uhci_hc_died(hcd_to_uhci(hcd));
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}
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static const struct of_device_id platform_uhci_ids[] = {
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{ .compatible = "generic-uhci", },
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{ .compatible = "platform-uhci", },
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{}
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};
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static struct platform_driver uhci_platform_driver = {
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.probe = uhci_hcd_platform_probe,
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.remove = uhci_hcd_platform_remove,
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.shutdown = uhci_hcd_platform_shutdown,
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.driver = {
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.name = "platform-uhci",
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.owner = THIS_MODULE,
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.of_match_table = platform_uhci_ids,
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},
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};
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