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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Now that the SPDX tag is in all USB files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
252 lines
6 KiB
C
252 lines
6 KiB
C
// 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 <nicolas.ferre@atmel.com>
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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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dev_err(&pdev->dev,
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"Found HC with no IRQ. Check %s setup!\n",
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dev_name(&pdev->dev));
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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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