Initial import

1 files changed, 225 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..c7a9b31ee
--- /dev/null
+++ b/drivers/usb/host/ehci-mxc.c
@@ -0,0 +1,225 @@
+/*
+ * 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 = dev_get_platdata(&pdev->dev);
+	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);
+	hcd->regs = devm_ioremap_resource(&pdev->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(&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;
+
+	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");