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249 lines
5.9 KiB
249 lines
5.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Driver for EHCI UHP on Atmel chips |
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* |
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* Copyright (C) 2009 Atmel Corporation, |
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* Nicolas Ferre <[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/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_platform.h> |
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#include <linux/platform_device.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 Atmel driver" |
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static const char hcd_name[] = "ehci-atmel"; |
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/* interface and function clocks */ |
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#define hcd_to_atmel_ehci_priv(h) \ |
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((struct atmel_ehci_priv *)hcd_to_ehci(h)->priv) |
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struct atmel_ehci_priv { |
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struct clk *iclk; |
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struct clk *uclk; |
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bool clocked; |
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}; |
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static struct hc_driver __read_mostly ehci_atmel_hc_driver; |
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static const struct ehci_driver_overrides ehci_atmel_drv_overrides __initconst = { |
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.extra_priv_size = sizeof(struct atmel_ehci_priv), |
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}; |
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/*-------------------------------------------------------------------------*/ |
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static void atmel_start_clock(struct atmel_ehci_priv *atmel_ehci) |
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{ |
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if (atmel_ehci->clocked) |
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return; |
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clk_prepare_enable(atmel_ehci->uclk); |
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clk_prepare_enable(atmel_ehci->iclk); |
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atmel_ehci->clocked = true; |
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} |
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static void atmel_stop_clock(struct atmel_ehci_priv *atmel_ehci) |
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{ |
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if (!atmel_ehci->clocked) |
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return; |
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clk_disable_unprepare(atmel_ehci->iclk); |
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clk_disable_unprepare(atmel_ehci->uclk); |
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atmel_ehci->clocked = false; |
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} |
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static void atmel_start_ehci(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 atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd); |
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dev_dbg(&pdev->dev, "start\n"); |
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atmel_start_clock(atmel_ehci); |
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} |
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static void atmel_stop_ehci(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 atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd); |
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dev_dbg(&pdev->dev, "stop\n"); |
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atmel_stop_clock(atmel_ehci); |
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} |
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/*-------------------------------------------------------------------------*/ |
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static int ehci_atmel_drv_probe(struct platform_device *pdev) |
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{ |
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struct usb_hcd *hcd; |
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const struct hc_driver *driver = &ehci_atmel_hc_driver; |
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struct resource *res; |
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struct ehci_hcd *ehci; |
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struct atmel_ehci_priv *atmel_ehci; |
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int irq; |
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int retval; |
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if (usb_disabled()) |
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return -ENODEV; |
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pr_debug("Initializing Atmel-SoC USB Host Controller\n"); |
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irq = platform_get_irq(pdev, 0); |
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if (irq <= 0) { |
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retval = -ENODEV; |
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goto fail_create_hcd; |
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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_create_hcd; |
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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_create_hcd; |
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} |
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atmel_ehci = hcd_to_atmel_ehci_priv(hcd); |
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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 fail_request_resource; |
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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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atmel_ehci->iclk = devm_clk_get(&pdev->dev, "ehci_clk"); |
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if (IS_ERR(atmel_ehci->iclk)) { |
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dev_err(&pdev->dev, "Error getting interface clock\n"); |
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retval = -ENOENT; |
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goto fail_request_resource; |
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} |
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atmel_ehci->uclk = devm_clk_get(&pdev->dev, "usb_clk"); |
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if (IS_ERR(atmel_ehci->uclk)) { |
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dev_err(&pdev->dev, "failed to get uclk\n"); |
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retval = PTR_ERR(atmel_ehci->uclk); |
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goto fail_request_resource; |
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} |
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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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atmel_start_ehci(pdev); |
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retval = usb_add_hcd(hcd, irq, IRQF_SHARED); |
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if (retval) |
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goto fail_add_hcd; |
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device_wakeup_enable(hcd->self.controller); |
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return retval; |
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fail_add_hcd: |
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atmel_stop_ehci(pdev); |
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fail_request_resource: |
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usb_put_hcd(hcd); |
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fail_create_hcd: |
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dev_err(&pdev->dev, "init %s fail, %d\n", |
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dev_name(&pdev->dev), retval); |
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return retval; |
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} |
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static int ehci_atmel_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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usb_remove_hcd(hcd); |
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usb_put_hcd(hcd); |
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atmel_stop_ehci(pdev); |
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return 0; |
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} |
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static int __maybe_unused ehci_atmel_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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struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd); |
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int ret; |
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ret = ehci_suspend(hcd, false); |
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if (ret) |
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return ret; |
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atmel_stop_clock(atmel_ehci); |
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return 0; |
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} |
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static int __maybe_unused ehci_atmel_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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struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd); |
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atmel_start_clock(atmel_ehci); |
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ehci_resume(hcd, false); |
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return 0; |
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} |
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#ifdef CONFIG_OF |
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static const struct of_device_id atmel_ehci_dt_ids[] = { |
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{ .compatible = "atmel,at91sam9g45-ehci" }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(of, atmel_ehci_dt_ids); |
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#endif |
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static SIMPLE_DEV_PM_OPS(ehci_atmel_pm_ops, ehci_atmel_drv_suspend, |
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ehci_atmel_drv_resume); |
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static struct platform_driver ehci_atmel_driver = { |
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.probe = ehci_atmel_drv_probe, |
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.remove = ehci_atmel_drv_remove, |
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.shutdown = usb_hcd_platform_shutdown, |
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.driver = { |
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.name = "atmel-ehci", |
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.pm = &ehci_atmel_pm_ops, |
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.of_match_table = of_match_ptr(atmel_ehci_dt_ids), |
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}, |
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}; |
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static int __init ehci_atmel_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_atmel_hc_driver, &ehci_atmel_drv_overrides); |
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return platform_driver_register(&ehci_atmel_driver); |
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} |
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module_init(ehci_atmel_init); |
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static void __exit ehci_atmel_cleanup(void) |
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{ |
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platform_driver_unregister(&ehci_atmel_driver); |
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} |
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module_exit(ehci_atmel_cleanup); |
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MODULE_DESCRIPTION(DRIVER_DESC); |
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MODULE_ALIAS("platform:atmel-ehci"); |
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MODULE_AUTHOR("Nicolas Ferre"); |
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MODULE_LICENSE("GPL");
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