mirror of
https://github.com/edk2-porting/linux-next.git
synced 2025-01-04 03:33:58 +08:00
e592c5d0b7
This reverts commit 73d4066055.
Martin Steigerwald reported that this change caused a hard lockup when
using USB if threadirqs are enabled. Thomas pointed out that this patch
is incorrect, and can cause problems. So revert it to get the
previously working functionality back.
Reported-by: Martin Steigerwald <Martin@lichtvoll.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Chuansheng Liu <chuansheng.liu@intel.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
148 lines
3.0 KiB
C
148 lines
3.0 KiB
C
/*
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* Bus Glue for Loongson LS1X built-in EHCI controller.
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*
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* Copyright (c) 2012 Zhang, Keguang <keguang.zhang@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/platform_device.h>
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static int ehci_ls1x_reset(struct usb_hcd *hcd)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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int ret;
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ehci->caps = hcd->regs;
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ret = ehci_setup(hcd);
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if (ret)
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return ret;
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ehci_port_power(ehci, 0);
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return 0;
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}
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static const struct hc_driver ehci_ls1x_hc_driver = {
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.description = hcd_name,
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.product_desc = "LOONGSON1 EHCI",
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.hcd_priv_size = sizeof(struct ehci_hcd),
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/*
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* generic hardware linkage
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*/
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.irq = ehci_irq,
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.flags = HCD_MEMORY | HCD_USB2,
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/*
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* basic lifecycle operations
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*/
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.reset = ehci_ls1x_reset,
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.start = ehci_run,
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.stop = ehci_stop,
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.shutdown = ehci_shutdown,
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/*
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* managing i/o requests and associated device resources
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*/
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.urb_enqueue = ehci_urb_enqueue,
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.urb_dequeue = ehci_urb_dequeue,
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.endpoint_disable = ehci_endpoint_disable,
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.endpoint_reset = ehci_endpoint_reset,
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/*
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* scheduling support
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*/
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.get_frame_number = ehci_get_frame,
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/*
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* root hub support
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*/
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.hub_status_data = ehci_hub_status_data,
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.hub_control = ehci_hub_control,
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.relinquish_port = ehci_relinquish_port,
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.port_handed_over = ehci_port_handed_over,
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.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
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};
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static int ehci_hcd_ls1x_probe(struct platform_device *pdev)
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{
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struct usb_hcd *hcd;
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struct resource *res;
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int irq;
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int ret;
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pr_debug("initializing loongson1 ehci USB Controller\n");
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if (usb_disabled())
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return -ENODEV;
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res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (!res) {
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dev_err(&pdev->dev,
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"Found HC with no IRQ. Check %s setup!\n",
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dev_name(&pdev->dev));
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return -ENODEV;
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}
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irq = res->start;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev,
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"Found HC with no register addr. Check %s setup!\n",
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dev_name(&pdev->dev));
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return -ENODEV;
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}
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hcd = usb_create_hcd(&ehci_ls1x_hc_driver, &pdev->dev,
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dev_name(&pdev->dev));
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if (!hcd)
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return -ENOMEM;
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hcd->rsrc_start = res->start;
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hcd->rsrc_len = resource_size(res);
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hcd->regs = devm_request_and_ioremap(&pdev->dev, res);
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if (hcd->regs == NULL) {
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dev_dbg(&pdev->dev, "error mapping memory\n");
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ret = -EFAULT;
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goto err_put_hcd;
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}
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ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
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if (ret)
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goto err_put_hcd;
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return ret;
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err_put_hcd:
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usb_put_hcd(hcd);
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return ret;
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}
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static int ehci_hcd_ls1x_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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static struct platform_driver ehci_ls1x_driver = {
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.probe = ehci_hcd_ls1x_probe,
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.remove = ehci_hcd_ls1x_remove,
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.shutdown = usb_hcd_platform_shutdown,
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.driver = {
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.name = "ls1x-ehci",
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.owner = THIS_MODULE,
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},
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};
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MODULE_ALIAS(PLATFORM_MODULE_PREFIX "ls1x-ehci");
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