diff options
Diffstat (limited to 'drivers/usb/host/ehci-mxc.c')
| -rw-r--r-- | drivers/usb/host/ehci-mxc.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-mxc.c b/drivers/usb/host/ehci-mxc.c new file mode 100644 index 000000000..dc2676320 --- /dev/null +++ b/drivers/usb/host/ehci-mxc.c @@ -0,0 +1,213 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix + * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de> + */ + +#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 device *dev = &pdev->dev; + struct mxc_usbh_platform_data *pdata = dev_get_platdata(dev); + struct usb_hcd *hcd; + struct resource *res; + int irq, ret; + struct ehci_mxc_priv *priv; + struct ehci_hcd *ehci; + + if (!pdata) { + dev_err(dev, "No platform data given, bailing out.\n"); + return -EINVAL; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev)); + if (!hcd) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + hcd->regs = devm_ioremap_resource(dev, res); + if (IS_ERR(hcd->regs)) { + ret = PTR_ERR(hcd->regs); + goto err_alloc; + } + hcd->rsrc_start = res->start; + hcd->rsrc_len = resource_size(res); + + hcd->has_tt = 1; + ehci = hcd_to_ehci(hcd); + priv = (struct ehci_mxc_priv *) ehci->priv; + + /* enable clocks */ + priv->usbclk = devm_clk_get(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(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(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; + + device_wakeup_enable(hcd->self.controller); + 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 = dev_get_platdata(&pdev->dev); + 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); + 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"); |