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- /*
- * Driver for EHCI HCD on SPEAr SOC
- *
- * Copyright (C) 2010 ST Micro Electronics,
- * Deepak Sikri <deepak.sikri@st.com>
- *
- * Based on various ehci-*.c drivers
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file COPYING in the main directory of this archive for
- * more details.
- */
- #include <linux/clk.h>
- #include <linux/dma-mapping.h>
- #include <linux/io.h>
- #include <linux/jiffies.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/of.h>
- #include <linux/platform_device.h>
- #include <linux/pm.h>
- #include <linux/usb.h>
- #include <linux/usb/hcd.h>
- #include "ehci.h"
- #define DRIVER_DESC "EHCI SPEAr driver"
- static const char hcd_name[] = "SPEAr-ehci";
- struct spear_ehci {
- struct clk *clk;
- };
- #define to_spear_ehci(hcd) (struct spear_ehci *)(hcd_to_ehci(hcd)->priv)
- static struct hc_driver __read_mostly ehci_spear_hc_driver;
- #ifdef CONFIG_PM_SLEEP
- static int ehci_spear_drv_suspend(struct device *dev)
- {
- struct usb_hcd *hcd = dev_get_drvdata(dev);
- bool do_wakeup = device_may_wakeup(dev);
- return ehci_suspend(hcd, do_wakeup);
- }
- static int ehci_spear_drv_resume(struct device *dev)
- {
- struct usb_hcd *hcd = dev_get_drvdata(dev);
- ehci_resume(hcd, false);
- return 0;
- }
- #endif /* CONFIG_PM_SLEEP */
- static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend,
- ehci_spear_drv_resume);
- static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
- {
- struct usb_hcd *hcd ;
- struct spear_ehci *sehci;
- struct resource *res;
- struct clk *usbh_clk;
- const struct hc_driver *driver = &ehci_spear_hc_driver;
- int irq, retval;
- if (usb_disabled())
- return -ENODEV;
- irq = platform_get_irq(pdev, 0);
- if (irq < 0) {
- retval = irq;
- goto fail;
- }
- /*
- * Right now device-tree probed devices don't get dma_mask set.
- * Since shared usb code relies on it, set it here for now.
- * Once we have dma capability bindings this can go away.
- */
- retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
- if (retval)
- goto fail;
- usbh_clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(usbh_clk)) {
- dev_err(&pdev->dev, "Error getting interface clock\n");
- retval = PTR_ERR(usbh_clk);
- goto fail;
- }
- hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
- if (!hcd) {
- retval = -ENOMEM;
- goto fail;
- }
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- hcd->regs = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(hcd->regs)) {
- retval = PTR_ERR(hcd->regs);
- goto err_put_hcd;
- }
- hcd->rsrc_start = res->start;
- hcd->rsrc_len = resource_size(res);
- sehci = to_spear_ehci(hcd);
- sehci->clk = usbh_clk;
- /* registers start at offset 0x0 */
- hcd_to_ehci(hcd)->caps = hcd->regs;
- clk_prepare_enable(sehci->clk);
- retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
- if (retval)
- goto err_stop_ehci;
- device_wakeup_enable(hcd->self.controller);
- return retval;
- err_stop_ehci:
- clk_disable_unprepare(sehci->clk);
- err_put_hcd:
- usb_put_hcd(hcd);
- fail:
- dev_err(&pdev->dev, "init fail, %d\n", retval);
- return retval ;
- }
- static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
- {
- struct usb_hcd *hcd = platform_get_drvdata(pdev);
- struct spear_ehci *sehci = to_spear_ehci(hcd);
- usb_remove_hcd(hcd);
- if (sehci->clk)
- clk_disable_unprepare(sehci->clk);
- usb_put_hcd(hcd);
- return 0;
- }
- static const struct of_device_id spear_ehci_id_table[] = {
- { .compatible = "st,spear600-ehci", },
- { },
- };
- MODULE_DEVICE_TABLE(of, spear_ehci_id_table);
- static struct platform_driver spear_ehci_hcd_driver = {
- .probe = spear_ehci_hcd_drv_probe,
- .remove = spear_ehci_hcd_drv_remove,
- .shutdown = usb_hcd_platform_shutdown,
- .driver = {
- .name = "spear-ehci",
- .bus = &platform_bus_type,
- .pm = &ehci_spear_pm_ops,
- .of_match_table = spear_ehci_id_table,
- }
- };
- static const struct ehci_driver_overrides spear_overrides __initdata = {
- .extra_priv_size = sizeof(struct spear_ehci),
- };
- static int __init ehci_spear_init(void)
- {
- if (usb_disabled())
- return -ENODEV;
- pr_info("%s: " DRIVER_DESC "\n", hcd_name);
- ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
- return platform_driver_register(&spear_ehci_hcd_driver);
- }
- module_init(ehci_spear_init);
- static void __exit ehci_spear_cleanup(void)
- {
- platform_driver_unregister(&spear_ehci_hcd_driver);
- }
- module_exit(ehci_spear_cleanup);
- MODULE_DESCRIPTION(DRIVER_DESC);
- MODULE_ALIAS("platform:spear-ehci");
- MODULE_AUTHOR("Deepak Sikri");
- MODULE_LICENSE("GPL");
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