255 lines
6.1 KiB
C
255 lines
6.1 KiB
C
/*
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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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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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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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return ehci_resume(hcd, false);
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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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