| /* |
| * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix |
| * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de> |
| * |
| * 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 <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/io.h> |
| #include <linux/platform_device.h> |
| #include <linux/clk.h> |
| #include <linux/delay.h> |
| #include <linux/usb/otg.h> |
| #include <linux/usb/ulpi.h> |
| #include <linux/slab.h> |
| #include <linux/usb.h> |
| #include <linux/usb/hcd.h> |
| #include <linux/platform_data/usb-ehci-mxc.h> |
| #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->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); |
| return 0; |
| } |
| |
| MODULE_ALIAS("platform:mxc-ehci"); |
| |
| static struct platform_driver ehci_mxc_driver = { |
| .probe = ehci_mxc_drv_probe, |
| .remove = ehci_mxc_drv_remove, |
| .shutdown = usb_hcd_platform_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"); |