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![Jan Andersson](/assets/img/avatar_default.png)
The two first HC capability registers (CAPLENGTH and HCIVERSION) are defined as one 8-bit and one 16-bit register. Most HC implementations have selected to treat these registers as part of a 32-bit register, giving the same layout for both big and small endian systems. This patch adds a new quirk, big_endian_capbase, to support controllers with big endian register interfaces that treat HCIVERSION and CAPLENGTH as individual registers. Signed-off-by: Jan Andersson <jan@gaisler.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
173 lines
4.1 KiB
C
173 lines
4.1 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/platform_device.h>
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static int ehci_update_device(struct usb_hcd *hcd, struct usb_device *udev)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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int rc = 0;
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if (!udev->parent) /* udev is root hub itself, impossible */
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rc = -1;
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/* we only support lpm device connected to root hub yet */
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if (ehci->has_lpm && !udev->parent->parent) {
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rc = ehci_lpm_set_da(ehci, udev->devnum, udev->portnum);
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if (!rc)
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rc = ehci_lpm_check(ehci, udev->portnum);
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}
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return rc;
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}
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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_init,
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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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/*
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* call back when device connected and addressed
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*/
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.update_device = ehci_update_device,
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.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
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};
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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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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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if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
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pr_debug("request_mem_region failed");
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ret = -EBUSY;
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goto err1;
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}
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hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
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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 err2;
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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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ehci->regs = hcd->regs +
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HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
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dbg_hcs_params(ehci, "reset");
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dbg_hcc_params(ehci, "reset");
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/* cache this readonly data; minimize chip reads */
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ehci->hcs_params = readl(&ehci->caps->hcs_params);
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ehci_port_power(ehci, 1);
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ret = usb_add_hcd(hcd, pdev->resource[1].start,
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IRQF_DISABLED | 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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iounmap(hcd->regs);
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err2:
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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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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iounmap(hcd->regs);
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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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 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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}
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};
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MODULE_ALIAS("platform:vt8500-ehci");
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