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186 lines
4.2 KiB
186 lines
4.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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 <[email protected]> |
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* |
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* Based on various ehci-*.c drivers |
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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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static int __maybe_unused 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 __maybe_unused 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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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 = pm_ptr(&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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