192 lines
4.3 KiB
C
192 lines
4.3 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/dma-mapping.h>
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#include <linux/io.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/module.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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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include "ehci.h"
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#define DRIVER_DESC "EHCI SPEAr driver"
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static const char hcd_name[] = "SPEAr-ehci";
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struct spear_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)->priv)
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static struct hc_driver __read_mostly ehci_spear_hc_driver;
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#ifdef CONFIG_PM_SLEEP
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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_SLEEP */
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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 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 *sehci;
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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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retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
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if (retval)
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goto fail;
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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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hcd->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(hcd->regs)) {
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retval = PTR_ERR(hcd->regs);
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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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sehci = to_spear_ehci(hcd);
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sehci->clk = usbh_clk;
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/* registers start at offset 0x0 */
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hcd_to_ehci(hcd)->caps = hcd->regs;
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clk_prepare_enable(sehci->clk);
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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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device_wakeup_enable(hcd->self.controller);
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return retval;
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err_stop_ehci:
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clk_disable_unprepare(sehci->clk);
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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 *sehci = to_spear_ehci(hcd);
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usb_remove_hcd(hcd);
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if (sehci->clk)
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clk_disable_unprepare(sehci->clk);
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usb_put_hcd(hcd);
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return 0;
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}
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static const 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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MODULE_DEVICE_TABLE(of, spear_ehci_id_table);
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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 = spear_ehci_id_table,
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}
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};
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static const struct ehci_driver_overrides spear_overrides __initconst = {
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.extra_priv_size = sizeof(struct spear_ehci),
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};
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static int __init ehci_spear_init(void)
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{
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if (usb_disabled())
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return -ENODEV;
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pr_info("%s: " DRIVER_DESC "\n", hcd_name);
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ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
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return platform_driver_register(&spear_ehci_hcd_driver);
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}
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module_init(ehci_spear_init);
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static void __exit ehci_spear_cleanup(void)
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{
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platform_driver_unregister(&spear_ehci_hcd_driver);
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}
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module_exit(ehci_spear_cleanup);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_ALIAS("platform:spear-ehci");
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MODULE_AUTHOR("Deepak Sikri");
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MODULE_LICENSE("GPL");
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