forked from Minki/linux
4968f95191
This patch (as1622) removes the USB-2.1 Link Power Management code from the ehci-hcd driver. This code was never integrated with usbcore, it is full of bugs, and it was not getting used by anybody. However, the debugging code for dumping the LPM-related fields in the EHCI registers is left in place. In theory it might be useful to see these values, even though we don't use them. This essentially amounts to a partial revert of commitaa4d834298(USB: EHCI: EHCI 1.1 addendum: preparation) and an almost full revert of commit48f2497014(USB: EHCI: EHCI 1.1 addendum: Basic LPM feature support) plus its follow-ons. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
151 lines
3.5 KiB
C
151 lines
3.5 KiB
C
/*
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* drivers/usb/host/ehci-vt8500.c
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*
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* Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
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*
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* Based on ehci-au1xxx.c
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/of.h>
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#include <linux/platform_device.h>
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static const struct hc_driver vt8500_ehci_hc_driver = {
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.description = hcd_name,
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.product_desc = "VT8500 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_setup,
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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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.bus_suspend = ehci_bus_suspend,
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.bus_resume = ehci_bus_resume,
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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 u64 vt8500_ehci_dma_mask = DMA_BIT_MASK(32);
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static int vt8500_ehci_drv_probe(struct platform_device *pdev)
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{
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struct usb_hcd *hcd;
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struct ehci_hcd *ehci;
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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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if (!pdev->dev.dma_mask)
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pdev->dev.dma_mask = &vt8500_ehci_dma_mask;
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if (pdev->resource[1].flags != IORESOURCE_IRQ) {
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pr_debug("resource[1] is not IORESOURCE_IRQ");
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return -ENOMEM;
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}
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hcd = usb_create_hcd(&vt8500_ehci_hc_driver, &pdev->dev, "VT8500");
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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->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) {
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pr_debug("ioremap failed");
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ret = -ENOMEM;
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goto err1;
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}
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ehci = hcd_to_ehci(hcd);
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ehci->caps = hcd->regs;
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ret = usb_add_hcd(hcd, pdev->resource[1].start,
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IRQF_SHARED);
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if (ret == 0) {
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platform_set_drvdata(pdev, hcd);
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return ret;
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}
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err1:
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usb_put_hcd(hcd);
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return ret;
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}
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static int vt8500_ehci_drv_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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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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static const struct of_device_id vt8500_ehci_ids[] = {
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{ .compatible = "via,vt8500-ehci", },
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{ .compatible = "wm,prizm-ehci", },
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{}
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};
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static struct platform_driver vt8500_ehci_driver = {
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.probe = vt8500_ehci_drv_probe,
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.remove = vt8500_ehci_drv_remove,
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.shutdown = usb_hcd_platform_shutdown,
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.driver = {
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.name = "vt8500-ehci",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(vt8500_ehci_ids),
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}
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};
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MODULE_ALIAS("platform:vt8500-ehci");
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MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);
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