193 lines
4.3 KiB
C
193 lines
4.3 KiB
C
/*
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* EHCI HCD (Host Controller Driver) for USB.
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*
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* Copyright (C) 2007 Atheros Communications, Inc.
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* Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
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*
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* Bus Glue for Atheros AR71xx built-in EHCI controller
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*
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*/
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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extern int usb_disabled(void);
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static void ar71xx_start_ehci(struct platform_device *pdev)
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{
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}
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static void ar71xx_stop_ehci(struct platform_device *pdev)
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{
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/*
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* TODO: implement
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*/
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}
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int usb_ehci_ar71xx_probe(const struct hc_driver *driver,
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struct usb_hcd **hcd_out,
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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 irq;
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int ret;
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res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (!res) {
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dev_dbg(&pdev->dev, "no IRQ specified for %s\n",
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pdev->dev.bus_id);
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return -ENODEV;
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}
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irq = res->start;
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hcd = usb_create_hcd(driver, &pdev->dev, pdev->dev.bus_id);
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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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if (!res) {
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dev_dbg(&pdev->dev, "no base address specified for %s\n",
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pdev->dev.bus_id);
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ret = -ENODEV;
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goto err_put_hcd;
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}
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hcd->rsrc_start = res->start;
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hcd->rsrc_len = res->end - res->start + 1;
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if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
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dev_dbg(&pdev->dev, "controller already in use\n");
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ret = -EBUSY;
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goto err_put_hcd;
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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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dev_dbg(&pdev->dev, "error mapping memory\n");
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ret = -EFAULT;
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goto err_release_region;
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}
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ar71xx_start_ehci(pdev);
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#if 0
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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 + HC_LENGTH(readl(&ehci->caps->hc_capbase));
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ehci->hcs_params = readl(&ehci->caps->hcs_params);
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#endif
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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_stop_ehc;
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return 0;
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err_stop_ehc:
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ar71xx_stop_ehci(pdev);
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iounmap(hcd->regs);
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err_release_region:
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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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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/* may be called without controller electrically present */
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/* may be called with controller, bus, and devices active */
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/**
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* usb_ehci_ar71xx_remove - shutdown processing for AR71xx-based HCDs
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* @dev: USB Host Controller being removed
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* Context: !in_interrupt()
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*
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* Reverses the effect of usb_hcd_ar71xx_probe(), first invoking
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* the HCD's stop() method. It is always called from a thread
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* context, normally "rmmod", "apmd", or something similar.
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*
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*/
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static void usb_ehci_ar71xx_remove(struct usb_hcd *hcd,
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struct platform_device *pdev)
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{
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usb_remove_hcd(hcd);
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ar71xx_stop_ehci(pdev);
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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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}
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static const struct hc_driver ehci_ar71xx_hc_driver = {
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.description = hcd_name,
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.product_desc = "Atheros AR71xx built-in EHCI controller",
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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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/*
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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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#ifdef CONFIG_PM
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.hub_suspend = ehci_hub_suspend,
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.hub_resume = ehci_hub_resume,
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#endif
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};
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static int ehci_hcd_ar71xx_drv_probe(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = NULL;
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int ret;
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ret = -ENODEV;
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if (!usb_disabled())
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ret = usb_ehci_ar71xx_probe(&ehci_ar71xx_hc_driver, &hcd, pdev);
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return ret;
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}
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static int ehci_hcd_ar71xx_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_ehci_ar71xx_remove(hcd, pdev);
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return 0;
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}
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static struct platform_driver ehci_hcd_ar71xx_driver = {
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.probe = ehci_hcd_ar71xx_drv_probe,
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.remove = ehci_hcd_ar71xx_drv_remove,
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.shutdown = usb_hcd_platform_shutdown,
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.driver = {
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.name = "ar71xx-ehci",
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.bus = &platform_bus_type
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}
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};
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MODULE_ALIAS("ar71xx-ehci");
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