1 files changed, 344 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-mxc.c b/drivers/usb/host/ehci-mxc.c
new file mode 100644
index 00000000..a797d51e
--- /dev/null
+++ b/drivers/usb/host/ehci-mxc.c
@@ -0,0 +1,344 @@
+/*
+ * 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/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 <mach/hardware.h>
+#include <mach/mxc_ehci.h>
+
+#include <asm/mach-types.h>
+
+#define ULPI_VIEWPORT_OFFSET	0x170
+
+struct ehci_mxc_priv {
+	struct clk *usbclk, *ahbclk, *phy1clk;
+	struct usb_hcd *hcd;
+};
+
+/* called during probe() after chip reset completes */
+static int ehci_mxc_setup(struct usb_hcd *hcd)
+{
+	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+	int retval;
+
+	dbg_hcs_params(ehci, "reset");
+	dbg_hcc_params(ehci, "reset");
+
+	/* cache this readonly data; minimize chip reads */
+	ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
+
+	hcd->has_tt = 1;
+
+	retval = ehci_halt(ehci);
+	if (retval)
+		return retval;
+
+	/* data structure init */
+	retval = ehci_init(hcd);
+	if (retval)
+		return retval;
+
+	ehci->sbrn = 0x20;
+
+	ehci_reset(ehci);
+
+	ehci_port_power(ehci, 0);
+	return 0;
+}
+
+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;
+	unsigned int flags;
+	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 = kzalloc(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_get_resource;
+	}
+
+	hcd->rsrc_start = res->start;
+	hcd->rsrc_len = resource_size(res);
+
+	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+		dev_dbg(dev, "controller already in use\n");
+		ret = -EBUSY;
+		goto err_request_mem;
+	}
+
+	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+	if (!hcd->regs) {
+		dev_err(dev, "error mapping memory\n");
+		ret = -EFAULT;
+		goto err_ioremap;
+	}
+
+	/* enable clocks */
+	priv->usbclk = clk_get(dev, "usb");
+	if (IS_ERR(priv->usbclk)) {
+		ret = PTR_ERR(priv->usbclk);
+		goto err_clk;
+	}
+	clk_enable(priv->usbclk);
+
+	if (!cpu_is_mx35() && !cpu_is_mx25()) {
+		priv->ahbclk = clk_get(dev, "usb_ahb");
+		if (IS_ERR(priv->ahbclk)) {
+			ret = PTR_ERR(priv->ahbclk);
+			goto err_clk_ahb;
+		}
+		clk_enable(priv->ahbclk);
+	}
+
+	/* "dr" device has its own clock on i.MX51 */
+	if (cpu_is_mx51() && (pdev->id == 0)) {
+		priv->phy1clk = clk_get(dev, "usb_phy1");
+		if (IS_ERR(priv->phy1clk)) {
+			ret = PTR_ERR(priv->phy1clk);
+			goto err_clk_phy;
+		}
+		clk_enable(priv->phy1clk);
+	}
+
+
+	/* 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;
+
+	if (pdata->otg) {
+		/*
+		 * efikamx and efikasb have some hardware bug which is
+		 * preventing usb to work unless CHRGVBUS is set.
+		 * It's in violation of USB specs
+		 */
+		if (machine_is_mx51_efikamx() || machine_is_mx51_efikasb()) {
+			flags = usb_phy_io_read(pdata->otg,
+							ULPI_OTG_CTRL);
+			flags |= ULPI_OTG_CTRL_CHRGVBUS;
+			ret = usb_phy_io_write(pdata->otg, flags,
+							ULPI_OTG_CTRL);
+			if (ret) {
+				dev_err(dev, "unable to set CHRVBUS\n");
+				goto err_add;
+			}
+		}
+	}
+
+	return 0;
+
+err_add:
+	if (pdata && pdata->exit)
+		pdata->exit(pdev);
+err_init:
+	if (priv->phy1clk) {
+		clk_disable(priv->phy1clk);
+		clk_put(priv->phy1clk);
+	}
+err_clk_phy:
+	if (priv->ahbclk) {
+		clk_disable(priv->ahbclk);
+		clk_put(priv->ahbclk);
+	}
+err_clk_ahb:
+	clk_disable(priv->usbclk);
+	clk_put(priv->usbclk);
+err_clk:
+	iounmap(hcd->regs);
+err_ioremap:
+	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err_request_mem:
+err_get_resource:
+	kfree(priv);
+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);
+	iounmap(hcd->regs);
+	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+	usb_put_hcd(hcd);
+	platform_set_drvdata(pdev, NULL);
+
+	clk_disable(priv->usbclk);
+	clk_put(priv->usbclk);
+	if (priv->ahbclk) {
+		clk_disable(priv->ahbclk);
+		clk_put(priv->ahbclk);
+	}
+	if (priv->phy1clk) {
+		clk_disable(priv->phy1clk);
+		clk_put(priv->phy1clk);
+	}
+
+	kfree(priv);
+
+	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",
+	},
+};