mirror of https://gitee.com/openkylin/linux.git
220 lines
4.9 KiB
C
220 lines
4.9 KiB
C
/*
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* Driver for EHCI HCD on SPEAR SOC
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*
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* Copyright (C) 2010 ST Micro Electronics,
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* Deepak Sikri <deepak.sikri@st.com>
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*
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* Based on various ehci-*.c drivers
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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#include <linux/clk.h>
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#include <linux/jiffies.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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struct spear_ehci {
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struct ehci_hcd ehci;
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struct clk *clk;
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};
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#define to_spear_ehci(hcd) (struct spear_ehci *)hcd_to_ehci(hcd)
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static void spear_start_ehci(struct spear_ehci *ehci)
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{
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clk_prepare_enable(ehci->clk);
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}
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static void spear_stop_ehci(struct spear_ehci *ehci)
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{
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clk_disable_unprepare(ehci->clk);
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}
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static int ehci_spear_setup(struct usb_hcd *hcd)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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/* registers start at offset 0x0 */
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ehci->caps = hcd->regs;
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return ehci_setup(hcd);
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}
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static const struct hc_driver ehci_spear_hc_driver = {
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.description = hcd_name,
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.product_desc = "SPEAr EHCI",
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.hcd_priv_size = sizeof(struct spear_ehci),
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/* generic hardware linkage */
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.irq = ehci_irq,
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.flags = HCD_MEMORY | HCD_USB2,
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/* basic lifecycle operations */
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.reset = ehci_spear_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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/* managing i/o requests and associated device resources */
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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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/* scheduling support */
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.get_frame_number = ehci_get_frame,
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/* root hub support */
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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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#ifdef CONFIG_PM
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static int ehci_spear_drv_suspend(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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bool do_wakeup = device_may_wakeup(dev);
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return ehci_suspend(hcd, do_wakeup);
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}
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static int ehci_spear_drv_resume(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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ehci_resume(hcd, false);
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return 0;
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}
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#endif /* CONFIG_PM */
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static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend,
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ehci_spear_drv_resume);
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static u64 spear_ehci_dma_mask = DMA_BIT_MASK(32);
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static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
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{
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struct usb_hcd *hcd ;
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struct spear_ehci *ehci;
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struct resource *res;
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struct clk *usbh_clk;
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const struct hc_driver *driver = &ehci_spear_hc_driver;
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int irq, retval;
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if (usb_disabled())
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return -ENODEV;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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retval = irq;
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goto fail;
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}
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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 = &spear_ehci_dma_mask;
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usbh_clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(usbh_clk)) {
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dev_err(&pdev->dev, "Error getting interface clock\n");
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retval = PTR_ERR(usbh_clk);
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goto fail;
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}
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hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
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if (!hcd) {
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retval = -ENOMEM;
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goto fail;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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retval = -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 = resource_size(res);
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if (!devm_request_mem_region(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len,
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driver->description)) {
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retval = -EBUSY;
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goto err_put_hcd;
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}
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hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);
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if (hcd->regs == NULL) {
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dev_dbg(&pdev->dev, "error mapping memory\n");
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retval = -ENOMEM;
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goto err_put_hcd;
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}
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ehci = (struct spear_ehci *)hcd_to_ehci(hcd);
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ehci->clk = usbh_clk;
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spear_start_ehci(ehci);
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retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (retval)
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goto err_stop_ehci;
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return retval;
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err_stop_ehci:
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spear_stop_ehci(ehci);
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err_put_hcd:
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usb_put_hcd(hcd);
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fail:
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dev_err(&pdev->dev, "init fail, %d\n", retval);
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return retval ;
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}
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static int spear_ehci_hcd_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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struct spear_ehci *ehci_p = to_spear_ehci(hcd);
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if (!hcd)
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return 0;
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if (in_interrupt())
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BUG();
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usb_remove_hcd(hcd);
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if (ehci_p->clk)
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spear_stop_ehci(ehci_p);
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usb_put_hcd(hcd);
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return 0;
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}
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static struct of_device_id spear_ehci_id_table[] = {
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{ .compatible = "st,spear600-ehci", },
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{ },
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};
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static struct platform_driver spear_ehci_hcd_driver = {
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.probe = spear_ehci_hcd_drv_probe,
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.remove = spear_ehci_hcd_drv_remove,
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.shutdown = usb_hcd_platform_shutdown,
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.driver = {
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.name = "spear-ehci",
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.bus = &platform_bus_type,
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.pm = &ehci_spear_pm_ops,
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.of_match_table = of_match_ptr(spear_ehci_id_table),
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}
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};
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MODULE_ALIAS("platform:spear-ehci");
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