193 lines
4 KiB
C
193 lines
4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* SuperH EHCI host controller driver
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*
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* Copyright (C) 2010 Paul Mundt
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*
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* Based on ohci-sh.c and ehci-atmel.c.
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*/
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/platform_data/ehci-sh.h>
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struct ehci_sh_priv {
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struct clk *iclk, *fclk;
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struct usb_hcd *hcd;
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};
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static int ehci_sh_reset(struct usb_hcd *hcd)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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ehci->caps = hcd->regs;
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return ehci_setup(hcd);
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}
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static const struct hc_driver ehci_sh_hc_driver = {
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.description = hcd_name,
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.product_desc = "SuperH EHCI",
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.hcd_priv_size = sizeof(struct ehci_hcd),
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/*
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* generic hardware linkage
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*/
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.irq = ehci_irq,
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.flags = HCD_USB2 | HCD_MEMORY | HCD_BH,
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/*
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* basic lifecycle operations
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*/
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.reset = ehci_sh_reset,
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.start = ehci_run,
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.stop = ehci_stop,
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.shutdown = ehci_shutdown,
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/*
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* managing i/o requests and associated device resources
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*/
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.urb_enqueue = ehci_urb_enqueue,
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.urb_dequeue = ehci_urb_dequeue,
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.endpoint_disable = ehci_endpoint_disable,
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.endpoint_reset = ehci_endpoint_reset,
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/*
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* scheduling support
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*/
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.get_frame_number = ehci_get_frame,
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/*
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* root hub support
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*/
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.hub_status_data = ehci_hub_status_data,
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.hub_control = ehci_hub_control,
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#ifdef CONFIG_PM
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.bus_suspend = ehci_bus_suspend,
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.bus_resume = ehci_bus_resume,
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#endif
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.relinquish_port = ehci_relinquish_port,
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.port_handed_over = ehci_port_handed_over,
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.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
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};
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static int ehci_hcd_sh_probe(struct platform_device *pdev)
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{
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struct resource *res;
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struct ehci_sh_priv *priv;
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struct ehci_sh_platdata *pdata;
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struct usb_hcd *hcd;
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int irq, ret;
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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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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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ret = -ENODEV;
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goto fail_create_hcd;
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}
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pdata = dev_get_platdata(&pdev->dev);
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/* initialize hcd */
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hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev,
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dev_name(&pdev->dev));
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if (!hcd) {
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ret = -ENOMEM;
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goto fail_create_hcd;
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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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ret = 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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priv = devm_kzalloc(&pdev->dev, sizeof(struct ehci_sh_priv),
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GFP_KERNEL);
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if (!priv) {
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ret = -ENOMEM;
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goto fail_request_resource;
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}
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/* These are optional, we don't care if they fail */
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priv->fclk = devm_clk_get(&pdev->dev, "usb_fck");
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if (IS_ERR(priv->fclk))
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priv->fclk = NULL;
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priv->iclk = devm_clk_get(&pdev->dev, "usb_ick");
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if (IS_ERR(priv->iclk))
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priv->iclk = NULL;
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clk_enable(priv->fclk);
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clk_enable(priv->iclk);
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if (pdata && pdata->phy_init)
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pdata->phy_init();
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ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (ret != 0) {
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dev_err(&pdev->dev, "Failed to add hcd");
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goto fail_add_hcd;
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}
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device_wakeup_enable(hcd->self.controller);
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priv->hcd = hcd;
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platform_set_drvdata(pdev, priv);
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return ret;
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fail_add_hcd:
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clk_disable(priv->iclk);
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clk_disable(priv->fclk);
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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", dev_name(&pdev->dev), ret);
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return ret;
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}
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static int ehci_hcd_sh_remove(struct platform_device *pdev)
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{
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struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
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struct usb_hcd *hcd = priv->hcd;
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usb_remove_hcd(hcd);
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usb_put_hcd(hcd);
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clk_disable(priv->fclk);
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clk_disable(priv->iclk);
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return 0;
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}
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static void ehci_hcd_sh_shutdown(struct platform_device *pdev)
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{
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struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
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struct usb_hcd *hcd = priv->hcd;
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if (hcd->driver->shutdown)
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hcd->driver->shutdown(hcd);
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}
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static struct platform_driver ehci_hcd_sh_driver = {
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.probe = ehci_hcd_sh_probe,
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.remove = ehci_hcd_sh_remove,
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.shutdown = ehci_hcd_sh_shutdown,
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.driver = {
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.name = "sh_ehci",
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},
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};
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MODULE_ALIAS("platform:sh_ehci");
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