/* * 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 #define ULPI_VIEWPORT_OFFSET 0x170 struct ehci_mxc_priv { struct clk *usbclk, *ahbclk, *phyclk; struct usb_hcd *hcd; }; /* called during probe() after chip reset completes */ static int ehci_mxc_setup(struct usb_hcd *hcd) { hcd->has_tt = 1; return ehci_setup(hcd); } static const struct hc_driver ehci_mxc_hc_driver = { .description = hcd_name, .product_desc = "Freescale On-Chip EHCI Host Controller", .hcd_priv_size = sizeof(struct ehci_hcd), /* * generic hardware linkage */ .irq = ehci_irq, .flags = HCD_USB2 | HCD_MEMORY, /* * basic lifecycle operations */ .reset = ehci_mxc_setup, .start = ehci_run, .stop = ehci_stop, .shutdown = ehci_shutdown, /* * managing i/o requests and associated device resources */ .urb_enqueue = ehci_urb_enqueue, .urb_dequeue = ehci_urb_dequeue, .endpoint_disable = ehci_endpoint_disable, .endpoint_reset = ehci_endpoint_reset, /* * scheduling support */ .get_frame_number = ehci_get_frame, /* * root hub support */ .hub_status_data = ehci_hub_status_data, .hub_control = ehci_hub_control, .bus_suspend = ehci_bus_suspend, .bus_resume = ehci_bus_resume, .relinquish_port = ehci_relinquish_port, .port_handed_over = ehci_port_handed_over, .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, }; 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; dev_info(&pdev->dev, "initializing i.MX USB Controller\n"); 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; priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); if (!priv) { ret = -ENOMEM; goto err_alloc; } 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_request_and_ioremap(&pdev->dev, res); if (!hcd->regs) { dev_err(dev, "error mapping memory\n"); ret = -EFAULT; goto err_alloc; } /* 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 = hcd_to_ehci(hcd); /* 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; } } priv->hcd = hcd; platform_set_drvdata(pdev, priv); 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 __exit ehci_mxc_drv_remove(struct platform_device *pdev) { struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data; struct ehci_mxc_priv *priv = platform_get_drvdata(pdev); struct usb_hcd *hcd = priv->hcd; if (pdata && pdata->exit) pdata->exit(pdev); if (pdata->otg) usb_phy_shutdown(pdata->otg); usb_remove_hcd(hcd); usb_put_hcd(hcd); platform_set_drvdata(pdev, NULL); clk_disable_unprepare(priv->usbclk); clk_disable_unprepare(priv->ahbclk); if (priv->phyclk) clk_disable_unprepare(priv->phyclk); return 0; } static void ehci_mxc_drv_shutdown(struct platform_device *pdev) { struct ehci_mxc_priv *priv = platform_get_drvdata(pdev); struct usb_hcd *hcd = priv->hcd; 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 = __exit_p(ehci_mxc_drv_remove), .shutdown = ehci_mxc_drv_shutdown, .driver = { .name = "mxc-ehci", }, };