// SPDX-License-Identifier: GPL-2.0 /* * 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 */ #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" 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; static int __maybe_unused 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 __maybe_unused ehci_spear_drv_resume(struct device *dev) { struct usb_hcd *hcd = dev_get_drvdata(dev); ehci_resume(hcd, false); return 0; } 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; } hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &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 void 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); } 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_new = spear_ehci_hcd_drv_remove, .shutdown = usb_hcd_platform_shutdown, .driver = { .name = "spear-ehci", .bus = &platform_bus_type, .pm = pm_ptr(&ehci_spear_pm_ops), .of_match_table = spear_ehci_id_table, } }; static const struct ehci_driver_overrides spear_overrides __initconst = { .extra_priv_size = sizeof(struct spear_ehci), }; static int __init ehci_spear_init(void) { if (usb_disabled()) return -ENODEV; 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");