From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001 From: Yuval Adam <_@yuv.al> Date: Wed, 30 Aug 2017 08:25:59 +0000 Subject: Initial file dump from open source release --- drivers/usb/host/ehci-mxc.c | 240 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 240 insertions(+) create mode 100644 drivers/usb/host/ehci-mxc.c (limited to 'drivers/usb/host/ehci-mxc.c') diff --git a/drivers/usb/host/ehci-mxc.c b/drivers/usb/host/ehci-mxc.c new file mode 100644 index 00000000..ec128bc7 --- /dev/null +++ b/drivers/usb/host/ehci-mxc.c @@ -0,0 +1,240 @@ +/* + * Copyright (c) 2008 Sascha Hauer , Pengutronix + * Copyright (c) 2009 Daniel Mack + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "ehci.h" + +#define DRIVER_DESC "Freescale On-Chip EHCI Host driver" + +static const char hcd_name[] = "ehci-mxc"; + +#define ULPI_VIEWPORT_OFFSET 0x170 + +struct ehci_mxc_priv { + struct clk *usbclk, *ahbclk, *phyclk; +}; + +static struct hc_driver __read_mostly ehci_mxc_hc_driver; + +static const struct ehci_driver_overrides ehci_mxc_overrides __initconst = { + .extra_priv_size = sizeof(struct ehci_mxc_priv), +}; + +static int ehci_mxc_drv_probe(struct platform_device *pdev) +{ + struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data; + struct usb_hcd *hcd; + struct resource *res; + int irq, ret; + struct ehci_mxc_priv *priv; + struct device *dev = &pdev->dev; + struct ehci_hcd *ehci; + + if (!pdata) { + dev_err(dev, "No platform data given, bailing out.\n"); + return -EINVAL; + } + + irq = platform_get_irq(pdev, 0); + + hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev)); + if (!hcd) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(dev, "Found HC with no register addr. Check setup!\n"); + ret = -ENODEV; + goto err_alloc; + } + + hcd->rsrc_start = res->start; + hcd->rsrc_len = resource_size(res); + + hcd->regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(hcd->regs)) { + ret = PTR_ERR(hcd->regs); + goto err_alloc; + } + + hcd->has_tt = 1; + ehci = hcd_to_ehci(hcd); + priv = (struct ehci_mxc_priv *) ehci->priv; + + /* enable clocks */ + priv->usbclk = devm_clk_get(&pdev->dev, "ipg"); + if (IS_ERR(priv->usbclk)) { + ret = PTR_ERR(priv->usbclk); + goto err_alloc; + } + clk_prepare_enable(priv->usbclk); + + priv->ahbclk = devm_clk_get(&pdev->dev, "ahb"); + if (IS_ERR(priv->ahbclk)) { + ret = PTR_ERR(priv->ahbclk); + goto err_clk_ahb; + } + clk_prepare_enable(priv->ahbclk); + + /* "dr" device has its own clock on i.MX51 */ + priv->phyclk = devm_clk_get(&pdev->dev, "phy"); + if (IS_ERR(priv->phyclk)) + priv->phyclk = NULL; + if (priv->phyclk) + clk_prepare_enable(priv->phyclk); + + + /* call platform specific init function */ + if (pdata->init) { + ret = pdata->init(pdev); + if (ret) { + dev_err(dev, "platform init failed\n"); + goto err_init; + } + /* platforms need some time to settle changed IO settings */ + mdelay(10); + } + + /* EHCI registers start at offset 0x100 */ + ehci->caps = hcd->regs + 0x100; + ehci->regs = hcd->regs + 0x100 + + HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase)); + + /* set up the PORTSCx register */ + ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]); + + /* is this really needed? */ + msleep(10); + + /* Initialize the transceiver */ + if (pdata->otg) { + pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET; + ret = usb_phy_init(pdata->otg); + if (ret) { + dev_err(dev, "unable to init transceiver, probably missing\n"); + ret = -ENODEV; + goto err_add; + } + ret = otg_set_vbus(pdata->otg->otg, 1); + if (ret) { + dev_err(dev, "unable to enable vbus on transceiver\n"); + goto err_add; + } + } + + platform_set_drvdata(pdev, hcd); + + ret = usb_add_hcd(hcd, irq, IRQF_SHARED); + if (ret) + goto err_add; + + return 0; + +err_add: + if (pdata && pdata->exit) + pdata->exit(pdev); +err_init: + if (priv->phyclk) + clk_disable_unprepare(priv->phyclk); + + clk_disable_unprepare(priv->ahbclk); +err_clk_ahb: + clk_disable_unprepare(priv->usbclk); +err_alloc: + usb_put_hcd(hcd); + return ret; +} + +static int ehci_mxc_drv_remove(struct platform_device *pdev) +{ + struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data; + struct usb_hcd *hcd = platform_get_drvdata(pdev); + struct ehci_hcd *ehci = hcd_to_ehci(hcd); + struct ehci_mxc_priv *priv = (struct ehci_mxc_priv *) ehci->priv; + + usb_remove_hcd(hcd); + + if (pdata && pdata->exit) + pdata->exit(pdev); + + if (pdata && pdata->otg) + usb_phy_shutdown(pdata->otg); + + clk_disable_unprepare(priv->usbclk); + clk_disable_unprepare(priv->ahbclk); + + if (priv->phyclk) + clk_disable_unprepare(priv->phyclk); + + usb_put_hcd(hcd); + platform_set_drvdata(pdev, NULL); + return 0; +} + +static void ehci_mxc_drv_shutdown(struct platform_device *pdev) +{ + struct usb_hcd *hcd = platform_get_drvdata(pdev); + + if (hcd->driver->shutdown) + hcd->driver->shutdown(hcd); +} + +MODULE_ALIAS("platform:mxc-ehci"); + +static struct platform_driver ehci_mxc_driver = { + .probe = ehci_mxc_drv_probe, + .remove = ehci_mxc_drv_remove, + .shutdown = ehci_mxc_drv_shutdown, + .driver = { + .name = "mxc-ehci", + }, +}; + +static int __init ehci_mxc_init(void) +{ + if (usb_disabled()) + return -ENODEV; + + pr_info("%s: " DRIVER_DESC "\n", hcd_name); + + ehci_init_driver(&ehci_mxc_hc_driver, &ehci_mxc_overrides); + return platform_driver_register(&ehci_mxc_driver); +} +module_init(ehci_mxc_init); + +static void __exit ehci_mxc_cleanup(void) +{ + platform_driver_unregister(&ehci_mxc_driver); +} +module_exit(ehci_mxc_cleanup); + +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_AUTHOR("Sascha Hauer"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1