ehci_imx: Import from FreeBSD

Update #3869.

2 files changed, 728 insertions, 0 deletions

diff --git a/freebsd/sys/arm/freescale/imx/imx6_usbphy.c b/freebsd/sys/arm/freescale/imx/imx6_usbphy.c
new file mode 100644
index 00000000..8f47507b
--- /dev/null
+++ b/freebsd/sys/arm/freescale/imx/imx6_usbphy.c
@@ -0,0 +1,212 @@
+#include <machine/rtems-bsd-kernel-space.h>
+
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * USBPHY driver for Freescale i.MX6 family of SoCs.
+ */
+
+#include <rtems/bsd/local/opt_bus.h>
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/bus.h>
+#include <sys/rman.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <machine/bus.h>
+
+#include <arm/freescale/imx/imx_ccmvar.h>
+#include <arm/freescale/imx/imx6_anatopreg.h>
+#include <arm/freescale/imx/imx6_anatopvar.h>
+
+/*
+ * Hardware register defines.
+ */
+#define	PWD_REG				0x0000
+#define	CTRL_STATUS_REG			0x0030
+#define	CTRL_SET_REG			0x0034
+#define	CTRL_CLR_REG			0x0038
+#define	CTRL_TOGGLE_REG			0x003c
+#define	  CTRL_SFTRST			  (1U << 31)
+#define	  CTRL_CLKGATE			  (1 << 30)
+#define	  CTRL_ENUTMILEVEL3		  (1 << 15)
+#define	  CTRL_ENUTMILEVEL2		  (1 << 14)
+
+struct usbphy_softc {
+	device_t	dev;
+	struct resource	*mem_res;
+	u_int		phy_num;
+};
+
+static struct ofw_compat_data compat_data[] = {
+	{"fsl,imx6q-usbphy",	true},
+	{"fsl,imx6ul-usbphy",	true},
+	{NULL,			false}
+};
+
+static int
+usbphy_detach(device_t dev)
+{
+	struct usbphy_softc *sc;
+
+	sc = device_get_softc(dev);
+
+	if (sc->mem_res != NULL)
+		bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mem_res);
+
+	return (0);
+}
+
+static int
+usbphy_attach(device_t dev)
+{
+	struct usbphy_softc *sc;
+	int err, regoff, rid;
+
+	sc = device_get_softc(dev);
+	err = 0;
+
+	/* Allocate bus_space resources. */
+	rid = 0;
+	sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
+	    RF_ACTIVE);
+	if (sc->mem_res == NULL) {
+		device_printf(dev, "Cannot allocate memory resources\n");
+		err = ENXIO;
+		goto out;
+	}
+
+	/*
+	 * XXX Totally lame way to get the unit number (but not quite as lame as
+	 * adding an ad-hoc property to the fdt data).  This works as long as
+	 * this driver is used for imx6 only.
+	 */
+	const uint32_t PWD_PHY1_REG_PHYSADDR = 0x020c9000;
+	if (BUS_SPACE_PHYSADDR(sc->mem_res, 0) == PWD_PHY1_REG_PHYSADDR) {
+		sc->phy_num = 0;
+		regoff = 0;
+	} else {
+		sc->phy_num = 1;
+		regoff = 0x60;
+	}
+
+	/*
+	 * Based on a note in the u-boot source code, disable charger detection
+	 * to avoid degrading the differential signaling on the DP line.  Note
+	 * that this disables (by design) both charger detection and contact
+	 * detection, because of the screwball mix of active-high and active-low
+	 * bits in this register.
+	 */
+	imx6_anatop_write_4(IMX6_ANALOG_USB1_CHRG_DETECT + regoff, 
+	    IMX6_ANALOG_USB_CHRG_DETECT_N_ENABLE | 
+	    IMX6_ANALOG_USB_CHRG_DETECT_N_CHK_CHRG);
+
+	imx6_anatop_write_4(IMX6_ANALOG_USB1_CHRG_DETECT + regoff, 
+	    IMX6_ANALOG_USB_CHRG_DETECT_N_ENABLE | 
+	    IMX6_ANALOG_USB_CHRG_DETECT_N_CHK_CHRG);
+
+	/* XXX Configure the overcurrent detection here. */
+
+	/*
+	 * Turn on the phy clocks.
+	 */
+	imx_ccm_usbphy_enable(dev);
+
+	/*
+	 * Set the software reset bit, then clear both it and the clock gate bit
+	 * to bring the device out of reset with the clock running.
+	 */
+	bus_write_4(sc->mem_res, CTRL_SET_REG, CTRL_SFTRST);
+	bus_write_4(sc->mem_res, CTRL_CLR_REG, CTRL_SFTRST | CTRL_CLKGATE);
+
+	/* Set UTMI+ level 2+3 bits to enable low and full speed devices. */
+	bus_write_4(sc->mem_res, CTRL_SET_REG,
+	    CTRL_ENUTMILEVEL2 | CTRL_ENUTMILEVEL3);
+
+	/* Power up: clear all bits in the powerdown register. */
+	bus_write_4(sc->mem_res, PWD_REG, 0);
+
+	err = 0;
+
+out:
+
+	if (err != 0)
+		usbphy_detach(dev);
+
+	return (err);
+}
+
+static int
+usbphy_probe(device_t dev)
+{
+
+	if (!ofw_bus_status_okay(dev))
+		return (ENXIO);
+
+	if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)
+		return (ENXIO);
+
+	device_set_desc(dev, "Freescale i.MX6 USB PHY");
+
+	return (BUS_PROBE_DEFAULT);
+}
+
+static device_method_t usbphy_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,  usbphy_probe),
+	DEVMETHOD(device_attach, usbphy_attach),
+	DEVMETHOD(device_detach, usbphy_detach),
+
+	DEVMETHOD_END
+};
+
+static driver_t usbphy_driver = {
+	"usbphy",
+	usbphy_methods,
+	sizeof(struct usbphy_softc)
+};
+
+static devclass_t usbphy_devclass;
+
+/*
+ * This driver needs to start before the ehci driver, but later than the usual
+ * "special" drivers like clocks and cpu.  Ehci starts at DEFAULT so SUPPORTDEV
+ * is where this driver fits most.
+ */
+EARLY_DRIVER_MODULE(usbphy, simplebus, usbphy_driver, usbphy_devclass, 0, 0,
+    BUS_PASS_SUPPORTDEV + BUS_PASS_ORDER_MIDDLE);
+
diff --git a/freebsd/sys/dev/usb/controller/ehci_imx.c b/freebsd/sys/dev/usb/controller/ehci_imx.c
new file mode 100644
index 00000000..a872fb62
--- /dev/null
+++ b/freebsd/sys/dev/usb/controller/ehci_imx.c
@@ -0,0 +1,516 @@
+#include <machine/rtems-bsd-kernel-space.h>
+
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2010-2012 Semihalf
+ * Copyright (c) 2012 The FreeBSD Foundation
+ * Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Oleksandr Rybalko
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * EHCI driver for Freescale i.MX SoCs which incorporate the USBOH3 controller.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/bus.h>
+#include <sys/condvar.h>
+#include <sys/rman.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <dev/usb/usb.h>
+#include <dev/usb/usbdi.h>
+#include <dev/usb/usb_busdma.h>
+#include <dev/usb/usb_process.h>
+#include <dev/usb/usb_controller.h>
+#include <dev/usb/usb_bus.h>
+#include <dev/usb/controller/ehci.h>
+#include <dev/usb/controller/ehcireg.h>
+#include <rtems/bsd/local/usbdevs.h>
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+
+#include <arm/freescale/imx/imx_ccmvar.h>
+
+#include <rtems/bsd/local/opt_platform.h>
+
+/*
+ * Notes on the hardware and related FDT data seen in the wild.
+ *
+ * There are two sets of registers in the USBOH3 implementation; documentation
+ * refers to them as "core" and "non-core" registers.  A set of core register
+ * exists for each OTG or EHCI device.  There is a single set of non-core
+ * registers per USBOH3, and they control aspects of operation not directly
+ * related to the USB specs, such as whether interrupts from each of the core
+ * devices are able to generate a SoC wakeup event.
+ *
+ * In the FreeBSD universe we might be inclined to describe the core and
+ * non-core registers by using a pair of resource address/size values (two
+ * entries in the reg property for each core).  However, we have to work with
+ * existing FDT data (which mostly comes from the linux universe), and the way
+ * they've chosen to represent this is with an entry for a "usbmisc" device
+ * whose reg property describes the non-core registers. The way we handle FDT
+ * data, this means that the resources (memory-mapped register range) for the
+ * non-core registers belongs to a device other than the echi devices.
+ *
+ * Because the main ehci device cannot access registers in a range that's
+ * defined in the fdt data as belonging to another device, we implement a teeny
+ * little "usbmisc" driver which exists only to provide access to the usbmisc
+ * control register for each of the 4 usb controller instances.  That little
+ * driver is implemented here in this file, before the main driver.
+ *
+ * In addition to the single usbmisc device, the existing FDT data defines a
+ * separate device for each of the OTG or EHCI cores within the USBOH3.  Each of
+ * those devices has a set of core registers described by the reg property.
+ *
+ * The core registers for each of the four cores in the USBOH3 are divided into
+ * two parts: a set of imx-specific registers at an offset of 0 from the
+ * beginning of the register range, and the standard USB (EHCI or OTG) registers
+ * at an offset of 0x100 from the beginning of the register range.  The FreeBSD
+ * way of dealing with this might be to map out two ranges in the reg property,
+ * but that's not what the alternate universe has done.  To work with existing
+ * FDT data, we acquire the resource that maps all the core registers, then use
+ * bus_space_subregion() to create another resource that maps just the standard
+ * USB registers, which we provide to the standard USB code in the ehci_softc.
+ *
+ * The following compat strings have been seen for the OTG and EHCI cores.  The
+ * FDT compat table in this driver contains all these strings, but as of this
+ * writing, not all of these SoCs have been tested with the driver.  The fact
+ * that imx27 is common to all of them gives some hope that the driver will work
+ * on all these SoCs.
+ *   - "fsl,imx23-usb", "fsl,imx27-usb";
+ *   - "fsl,imx25-usb", "fsl,imx27-usb";
+ *   - "fsl,imx28-usb", "fsl,imx27-usb";
+ *   - "fsl,imx51-usb", "fsl,imx27-usb";
+ *   - "fsl,imx53-usb", "fsl,imx27-usb";
+ *   - "fsl,imx6q-usb", "fsl,imx27-usb";
+ *
+ * The FDT data for some SoCs contains the following properties, which we don't
+ * currently do anything with:
+ *   - fsl,usbmisc = <&usbmisc 0>;
+ *   - fsl,usbphy = <&usbphy0>;
+ *
+ * Some imx SoCs have FDT data related to USB PHY, some don't.  We have separate
+ * usbphy drivers where needed; this data is mentioned here just to keep all the
+ * imx-FDT-usb-related info in one place.  Here are the usbphy compat strings
+ * known to exist:
+ *   - "nop-usbphy"
+ *   - "usb-nop-xceiv";
+ *   - "fsl,imx23-usbphy" 
+ *   - "fsl,imx28-usbphy", "fsl,imx23-usbphy";
+ *   - "fsl,imx6q-usbphy", "fsl,imx23-usbphy";
+ *
+ */
+
+/*-----------------------------------------------------------------------------
+ * imx_usbmisc driver
+ *---------------------------------------------------------------------------*/
+
+#define	USBNC_OVER_CUR_POL	  (1u << 8)
+#define	USBNC_OVER_CUR_DIS	  (1u << 7)
+
+struct imx_usbmisc_softc {
+	device_t	dev;
+	struct resource	*mmio;
+};
+
+static struct ofw_compat_data usbmisc_compat_data[] = {
+	{"fsl,imx6q-usbmisc",	true},
+	{"fsl,imx51-usbmisc",	true},
+	{"fsl,imx25-usbmisc",	true},
+	{NULL, 			false},
+};
+
+static void
+imx_usbmisc_set_ctrl(device_t dev, u_int index, uint32_t bits)
+{
+	struct imx_usbmisc_softc *sc;
+	uint32_t reg;
+
+	sc = device_get_softc(dev);
+	reg = bus_read_4(sc->mmio, index * sizeof(uint32_t));
+	bus_write_4(sc->mmio, index * sizeof(uint32_t), reg | bits);
+}
+
+#ifdef notyet
+static void
+imx_usbmisc_clr_ctrl(device_t dev, u_int index, uint32_t bits)
+{
+	struct imx_usbmisc_softc *sc;
+	uint32_t reg;
+
+	sc = device_get_softc(dev);
+	reg = bus_read_4(sc->mmio, index * sizeof(uint32_t));
+	bus_write_4(sc->mmio, index * sizeof(uint32_t), reg & ~bits);
+}
+#endif
+
+static int
+imx_usbmisc_probe(device_t dev)
+{
+
+	if (!ofw_bus_status_okay(dev))
+		return (ENXIO);
+
+	if (ofw_bus_search_compatible(dev, usbmisc_compat_data)->ocd_data) {
+		device_set_desc(dev, "i.MX USB Misc Control");
+		return (BUS_PROBE_DEFAULT);
+	}
+	return (ENXIO);
+}
+
+static int
+imx_usbmisc_detach(device_t dev)
+{
+	struct imx_usbmisc_softc *sc;
+
+	sc = device_get_softc(dev);
+
+	if (sc->mmio != NULL)
+		bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mmio);
+
+	return (0);
+}
+
+static int
+imx_usbmisc_attach(device_t dev)
+{
+	struct imx_usbmisc_softc *sc;
+	int err, rid;
+
+	sc = device_get_softc(dev);
+	err = 0;
+
+	/* Allocate bus_space resources. */
+	rid = 0;
+	sc->mmio = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
+	    RF_ACTIVE);
+	if (sc->mmio == NULL) {
+		device_printf(dev, "Cannot allocate memory resources\n");
+		return (ENXIO);
+	}
+
+	OF_device_register_xref(OF_xref_from_node(ofw_bus_get_node(dev)), dev);
+
+	return (0);
+}
+
+static device_method_t imx_usbmisc_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe, 	imx_usbmisc_probe),
+	DEVMETHOD(device_attach,	imx_usbmisc_attach),
+	DEVMETHOD(device_detach,	imx_usbmisc_detach),
+
+	DEVMETHOD_END
+};
+
+static driver_t imx_usbmisc_driver = {
+	"imx_usbmisc",
+	imx_usbmisc_methods,
+	sizeof(struct imx_usbmisc_softc)
+};
+
+static devclass_t imx_usbmisc_devclass;
+
+/*
+ * This driver needs to start before the ehci driver, but later than the usual
+ * "special" drivers like clocks and cpu.  Ehci starts at DEFAULT so
+ * DEFAULT-1000 seems good.
+ */
+EARLY_DRIVER_MODULE(imx_usbmisc, simplebus, imx_usbmisc_driver,
+    imx_usbmisc_devclass, 0, 0, BUS_PASS_DEFAULT - 1000);
+
+/*-----------------------------------------------------------------------------
+ * imx_ehci driver...
+ *---------------------------------------------------------------------------*/
+
+/*
+ * Each EHCI device in the SoC has some SoC-specific per-device registers at an
+ * offset of 0, then the standard EHCI registers begin at an offset of 0x100.
+ */
+#define	IMX_EHCI_REG_OFF	0x100
+#define	IMX_EHCI_REG_SIZE	0x100
+
+struct imx_ehci_softc {
+	ehci_softc_t	ehci_softc;
+	device_t	dev;
+	struct resource	*ehci_mem_res;	/* EHCI core regs. */
+	struct resource	*ehci_irq_res;	/* EHCI core IRQ. */ 
+};
+
+static struct ofw_compat_data compat_data[] = {
+	{"fsl,imx6q-usb",	1},
+	{"fsl,imx53-usb",	1},
+	{"fsl,imx51-usb",	1},
+	{"fsl,imx28-usb",	1},
+	{"fsl,imx27-usb",	1},
+	{"fsl,imx25-usb",	1},
+	{"fsl,imx23-usb",	1},
+	{NULL,		 	0},
+};
+
+static void
+imx_ehci_post_reset(struct ehci_softc *ehci_softc)
+{
+        uint32_t usbmode;
+
+        /* Force HOST mode */
+        usbmode = EOREAD4(ehci_softc, EHCI_USBMODE_NOLPM);
+        usbmode &= ~EHCI_UM_CM;
+        usbmode |= EHCI_UM_CM_HOST;
+        EOWRITE4(ehci_softc, EHCI_USBMODE_NOLPM, usbmode);
+}
+
+static int
+imx_ehci_probe(device_t dev)
+{
+
+	if (!ofw_bus_status_okay(dev))
+		return (ENXIO);
+
+	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data != 0) {
+		device_set_desc(dev, "Freescale i.MX integrated USB controller");
+		return (BUS_PROBE_DEFAULT);
+	}
+	return (ENXIO);
+}
+
+static int
+imx_ehci_detach(device_t dev)
+{
+	struct imx_ehci_softc *sc;
+	ehci_softc_t *esc;
+	int err;
+
+	sc = device_get_softc(dev);
+
+	esc = &sc->ehci_softc;
+
+	/* First detach all children; we can't detach if that fails. */
+	if ((err = device_delete_children(dev)) != 0)
+		return (err);
+
+	if (esc->sc_flags & EHCI_SCFLG_DONEINIT)
+		ehci_detach(esc);
+	if (esc->sc_intr_hdl != NULL)
+		bus_teardown_intr(dev, esc->sc_irq_res, 
+		    esc->sc_intr_hdl);
+	if (sc->ehci_irq_res != NULL)
+		bus_release_resource(dev, SYS_RES_IRQ, 0, 
+		    sc->ehci_irq_res);
+	if (sc->ehci_mem_res != NULL)
+		bus_release_resource(dev, SYS_RES_MEMORY, 0,
+		    sc->ehci_mem_res);
+
+	usb_bus_mem_free_all(&esc->sc_bus, &ehci_iterate_hw_softc);
+
+	return (0);
+}
+
+static void
+imx_ehci_disable_oc(struct imx_ehci_softc *sc)
+{
+	device_t usbmdev;
+	pcell_t usbmprops[2];
+	phandle_t node;
+	ssize_t size;
+	int index;
+
+	/* Get the reference to the usbmisc driver from the fdt data */
+	node = ofw_bus_get_node(sc->dev);
+	size = OF_getencprop(node, "fsl,usbmisc", usbmprops,
+	    sizeof(usbmprops));
+	if (size < sizeof(usbmprops)) {
+		device_printf(sc->dev, "failed to retrieve fsl,usbmisc "
+		   "property, cannot disable overcurrent protection");
+		return;
+	}
+	/* Retrieve the device_t via the xref handle. */
+	usbmdev = OF_device_from_xref(usbmprops[0]);
+	if (usbmdev == NULL) {
+		device_printf(sc->dev, "usbmisc device not found, "
+		    "cannot disable overcurrent protection");
+		return;
+	}
+	/* Call the device routine to set the overcurrent disable bit. */
+	index = usbmprops[1];
+	imx_usbmisc_set_ctrl(usbmdev, index, USBNC_OVER_CUR_DIS);
+}
+
+static int
+imx_ehci_attach(device_t dev)
+{
+	struct imx_ehci_softc *sc;
+	ehci_softc_t *esc;
+	int err, rid;
+
+	sc = device_get_softc(dev);
+	sc->dev = dev;
+	esc = &sc->ehci_softc;
+	err = 0;
+
+	/* Allocate bus_space resources. */
+	rid = 0;
+	sc->ehci_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
+	    RF_ACTIVE);
+	if (sc->ehci_mem_res == NULL) {
+		device_printf(dev, "Cannot allocate memory resources\n");
+		err = ENXIO;
+		goto out;
+	}
+
+	rid = 0;
+	sc->ehci_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
+	    RF_ACTIVE);
+	if (sc->ehci_irq_res == NULL) {
+		device_printf(dev, "Cannot allocate IRQ resources\n");
+		err = ENXIO;
+		goto out;
+	}
+
+	esc->sc_io_tag = rman_get_bustag(sc->ehci_mem_res);
+	esc->sc_bus.parent = dev;
+	esc->sc_bus.devices = esc->sc_devices;
+	esc->sc_bus.devices_max = EHCI_MAX_DEVICES;
+	esc->sc_bus.dma_bits = 32;
+
+	/* allocate all DMA memory */
+	if (usb_bus_mem_alloc_all(&esc->sc_bus, USB_GET_DMA_TAG(dev),
+	    &ehci_iterate_hw_softc) != 0) {
+		device_printf(dev, "usb_bus_mem_alloc_all() failed\n");
+		err = ENOMEM;
+		goto out;
+	}
+
+	/*
+	 * Set handle to USB related registers subregion used by
+	 * generic EHCI driver.
+	 */
+	err = bus_space_subregion(esc->sc_io_tag, 
+	    rman_get_bushandle(sc->ehci_mem_res),
+	    IMX_EHCI_REG_OFF, IMX_EHCI_REG_SIZE, &esc->sc_io_hdl);
+	if (err != 0) {
+		device_printf(dev, "bus_space_subregion() failed\n");
+		err = ENXIO;
+		goto out;
+	}
+
+	/* Setup interrupt handler. */
+	err = bus_setup_intr(dev, sc->ehci_irq_res, INTR_TYPE_BIO | INTR_MPSAFE,
+	    NULL, (driver_intr_t *)ehci_interrupt, esc, &esc->sc_intr_hdl);
+	if (err != 0) {
+		device_printf(dev, "Could not setup IRQ\n");
+		goto out;
+	}
+
+	/* Turn on clocks. */
+	imx_ccm_usb_enable(dev);
+
+	/* Disable overcurrent detection, if configured to do so. */
+	if (OF_hasprop(ofw_bus_get_node(sc->dev), "disable-over-current"))
+		imx_ehci_disable_oc(sc);
+
+	/* Add USB bus device. */
+	esc->sc_bus.bdev = device_add_child(dev, "usbus", -1);
+	if (esc->sc_bus.bdev == NULL) {
+		device_printf(dev, "Could not add USB device\n");
+		goto out;
+	}
+	device_set_ivars(esc->sc_bus.bdev, &esc->sc_bus);
+
+	esc->sc_id_vendor = USB_VENDOR_FREESCALE;
+	strlcpy(esc->sc_vendor, "Freescale", sizeof(esc->sc_vendor));
+
+	/*
+	 * Set flags that affect ehci_init() behavior, and hook our post-reset
+	 * code into the standard controller code.
+	 */
+	esc->sc_flags |= EHCI_SCFLG_NORESTERM | EHCI_SCFLG_TT;
+	esc->sc_vendor_post_reset = imx_ehci_post_reset;
+	esc->sc_vendor_get_port_speed = ehci_get_port_speed_portsc;
+
+	err = ehci_init(esc);
+	if (err != 0) {
+		device_printf(dev, "USB init failed, usb_err_t=%d\n", 
+		    err);
+		goto out;
+	}
+	esc->sc_flags |= EHCI_SCFLG_DONEINIT;
+
+	/* Probe the bus. */
+	err = device_probe_and_attach(esc->sc_bus.bdev);
+	if (err != 0) {
+		device_printf(dev,
+		    "device_probe_and_attach() failed\n");
+		goto out;
+	}
+
+	err = 0;
+
+out:
+
+	if (err != 0)
+		imx_ehci_detach(dev);
+
+	return (err);
+}
+
+static device_method_t ehci_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe, imx_ehci_probe),
+	DEVMETHOD(device_attach, imx_ehci_attach),
+	DEVMETHOD(device_detach, imx_ehci_detach),
+	DEVMETHOD(device_suspend, bus_generic_suspend),
+	DEVMETHOD(device_resume, bus_generic_resume),
+	DEVMETHOD(device_shutdown, bus_generic_shutdown),
+
+	/* Bus interface */
+	DEVMETHOD(bus_print_child, bus_generic_print_child),
+
+	DEVMETHOD_END
+};
+
+static driver_t ehci_driver = {
+	"ehci",
+	ehci_methods,
+	sizeof(struct imx_ehci_softc)
+};
+
+static devclass_t ehci_devclass;
+
+DRIVER_MODULE(ehci, simplebus, ehci_driver, ehci_devclass, 0, 0);
+MODULE_DEPEND(ehci, usb, 1, 1, 1);