drivers/usb: regorganisation

move to linux usb driver organisation

as following

drivers/usb/gadget
drivers/usb/host
drivers/usb/musb

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Remy Bohmer <linux@bohmer.net>

1 files changed, 1399 insertions, 0 deletions

diff --git a/drivers/usb/gadget/mpc8xx_udc.c b/drivers/usb/gadget/mpc8xx_udc.c
new file mode 100644
index 0000000..da3fbba
--- /dev/null
+++ b/drivers/usb/gadget/mpc8xx_udc.c
@@ -0,0 +1,1399 @@
+/*
+ * Copyright (C) 2006 by Bryan O'Donoghue, CodeHermit
+ * bodonoghue@CodeHermit.ie
+ *
+ * References
+ * DasUBoot/drivers/usb/gadget/omap1510_udc.c, for design and implementation
+ * ideas.
+ *
+ * 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.,
+ * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ */
+
+/*
+ * Notes :
+ * 1.	#define __SIMULATE_ERROR__ to inject a CRC error into every 2nd TX
+ *		packet to force the USB re-transmit protocol.
+ *
+ * 2.	#define __DEBUG_UDC__ to switch on debug tracing to serial console
+ *	be careful that tracing doesn't create Hiesen-bugs with respect to
+ *	response timeouts to control requests.
+ *
+ * 3.	This driver should be able to support any higher level driver that
+ *	that wants to do either of the two standard UDC implementations
+ *	Control-Bulk-Interrupt or  Bulk-IN/Bulk-Out standards. Hence
+ *	gserial and cdc_acm should work with this code.
+ *
+ * 4.	NAK events never actually get raised at all, the documentation
+ *	is just wrong !
+ *
+ * 5.	For some reason, cbd_datlen is *always* +2 the value it should be.
+ *	this means that having an RX cbd of 16 bytes is not possible, since
+ *	the same size is reported for 14 bytes received as 16 bytes received
+ *	until we can find out why this happens, RX cbds must be limited to 8
+ *	bytes. TODO: check errata for this behaviour.
+ *
+ * 6.	Right now this code doesn't support properly powering up with the USB
+ *	cable attached to the USB host my development board the Adder87x doesn't
+ *	have a pull-up fitted to allow this, so it is necessary to power the
+ *	board and *then* attached the USB cable to the host. However somebody
+ *	with a different design in their board may be able to keep the cable
+ *	constantly connected and simply enable/disable a pull-up  re
+ *	figure 31.1 in MPC885RM.pdf instead of having to power up the board and
+ *	then attach the cable !
+ *
+ */
+#include <common.h>
+#include <config.h>
+#include <commproc.h>
+#include <usbdevice.h>
+#include <usb/mpc8xx_udc.h>
+
+#include "ep0.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define ERR(fmt, args...)\
+	serial_printf("ERROR : [%s] %s:%d: "fmt,\
+				__FILE__,__FUNCTION__,__LINE__, ##args)
+#ifdef __DEBUG_UDC__
+#define DBG(fmt,args...)\
+		serial_printf("[%s] %s:%d: "fmt,\
+				__FILE__,__FUNCTION__,__LINE__, ##args)
+#else
+#define DBG(fmt,args...)
+#endif
+
+/* Static Data */
+#ifdef __SIMULATE_ERROR__
+static char err_poison_test = 0;
+#endif
+static struct mpc8xx_ep ep_ref[MAX_ENDPOINTS];
+static u32 address_base = STATE_NOT_READY;
+static mpc8xx_udc_state_t udc_state = 0;
+static struct usb_device_instance *udc_device = 0;
+static volatile usb_epb_t *endpoints[MAX_ENDPOINTS];
+static volatile cbd_t *tx_cbd[TX_RING_SIZE];
+static volatile cbd_t *rx_cbd[RX_RING_SIZE];
+static volatile immap_t *immr = 0;
+static volatile cpm8xx_t *cp = 0;
+static volatile usb_pram_t *usb_paramp = 0;
+static volatile usb_t *usbp = 0;
+static int rx_ct = 0;
+static int tx_ct = 0;
+
+/* Static Function Declarations */
+static void mpc8xx_udc_state_transition_up (usb_device_state_t initial,
+					    usb_device_state_t final);
+static void mpc8xx_udc_state_transition_down (usb_device_state_t initial,
+					      usb_device_state_t final);
+static void mpc8xx_udc_stall (unsigned int ep);
+static void mpc8xx_udc_flush_tx_fifo (int epid);
+static void mpc8xx_udc_flush_rx_fifo (void);
+static void mpc8xx_udc_clear_rxbd (volatile cbd_t * rx_cbdp);
+static void mpc8xx_udc_init_tx (struct usb_endpoint_instance *epi,
+				struct urb *tx_urb);
+static void mpc8xx_udc_dump_request (struct usb_device_request *request);
+static void mpc8xx_udc_clock_init (volatile immap_t * immr,
+				   volatile cpm8xx_t * cp);
+static int mpc8xx_udc_ep_tx (struct usb_endpoint_instance *epi);
+static int mpc8xx_udc_epn_rx (unsigned int epid, volatile cbd_t * rx_cbdp);
+static void mpc8xx_udc_ep0_rx (volatile cbd_t * rx_cbdp);
+static void mpc8xx_udc_cbd_init (void);
+static void mpc8xx_udc_endpoint_init (void);
+static void mpc8xx_udc_cbd_attach (int ep, uchar tx_size, uchar rx_size);
+static u32 mpc8xx_udc_alloc (u32 data_size, u32 alignment);
+static int mpc8xx_udc_ep0_rx_setup (volatile cbd_t * rx_cbdp);
+static void mpc8xx_udc_set_nak (unsigned int ep);
+static short mpc8xx_udc_handle_txerr (void);
+static void mpc8xx_udc_advance_rx (volatile cbd_t ** rx_cbdp, int epid);
+
+/******************************************************************************
+			       Global Linkage
+ *****************************************************************************/
+
+/* udc_init
+ *
+ * Do initial bus gluing
+ */
+int udc_init (void)
+{
+	/* Init various pointers */
+	immr = (immap_t *) CONFIG_SYS_IMMR;
+	cp = (cpm8xx_t *) & (immr->im_cpm);
+	usb_paramp = (usb_pram_t *) & (cp->cp_dparam[PROFF_USB]);
+	usbp = (usb_t *) & (cp->cp_scc[0]);
+
+	memset (ep_ref, 0x00, (sizeof (struct mpc8xx_ep) * MAX_ENDPOINTS));
+
+	udc_device = 0;
+	udc_state = STATE_NOT_READY;
+
+	usbp->usmod = 0x00;
+	usbp->uscom = 0;
+
+	/* Set USB Frame #0, Respond at Address & Get a clock source  */
+	usbp->usaddr = 0x00;
+	mpc8xx_udc_clock_init (immr, cp);
+
+	/* PA15, PA14 as perhiperal USBRXD and USBOE */
+	immr->im_ioport.iop_padir &= ~0x0003;
+	immr->im_ioport.iop_papar |= 0x0003;
+
+	/* PC11/PC10 as peripheral USBRXP USBRXN */
+	immr->im_ioport.iop_pcso |= 0x0030;
+
+	/* PC7/PC6 as perhiperal USBTXP and USBTXN */
+	immr->im_ioport.iop_pcdir |= 0x0300;
+	immr->im_ioport.iop_pcpar |= 0x0300;
+
+	/* Set the base address */
+	address_base = (u32) (cp->cp_dpmem + CPM_USB_BASE);
+
+	/* Initialise endpoints and circular buffers */
+	mpc8xx_udc_endpoint_init ();
+	mpc8xx_udc_cbd_init ();
+
+	/* Assign allocated Dual Port Endpoint descriptors */
+	usb_paramp->ep0ptr = (u32) endpoints[0];
+	usb_paramp->ep1ptr = (u32) endpoints[1];
+	usb_paramp->ep2ptr = (u32) endpoints[2];
+	usb_paramp->ep3ptr = (u32) endpoints[3];
+	usb_paramp->frame_n = 0;
+
+	DBG ("ep0ptr=0x%08x ep1ptr=0x%08x ep2ptr=0x%08x ep3ptr=0x%08x\n",
+	     usb_paramp->ep0ptr, usb_paramp->ep1ptr, usb_paramp->ep2ptr,
+	     usb_paramp->ep3ptr);
+
+	return 0;
+}
+
+/* udc_irq
+ *
+ * Poll for whatever events may have occured
+ */
+void udc_irq (void)
+{
+	int epid = 0;
+	volatile cbd_t *rx_cbdp = 0;
+	volatile cbd_t *rx_cbdp_base = 0;
+
+	if (udc_state != STATE_READY) {
+		return;
+	}
+
+	if (usbp->usber & USB_E_BSY) {
+		/* This shouldn't happen. If it does then it's a bug ! */
+		usbp->usber |= USB_E_BSY;
+		mpc8xx_udc_flush_rx_fifo ();
+	}
+
+	/* Scan all RX/Bidirectional Endpoints for RX data. */
+	for (epid = 0; epid < MAX_ENDPOINTS; epid++) {
+		if (!ep_ref[epid].prx) {
+			continue;
+		}
+		rx_cbdp = rx_cbdp_base = ep_ref[epid].prx;
+
+		do {
+			if (!(rx_cbdp->cbd_sc & RX_BD_E)) {
+
+				if (rx_cbdp->cbd_sc & 0x1F) {
+					/* Corrupt data discard it.
+					 * Controller has NAK'd this packet.
+					 */
+					mpc8xx_udc_clear_rxbd (rx_cbdp);
+
+				} else {
+					if (!epid) {
+						mpc8xx_udc_ep0_rx (rx_cbdp);
+
+					} else {
+						/* Process data */
+						mpc8xx_udc_set_nak (epid);
+						mpc8xx_udc_epn_rx (epid, rx_cbdp);
+						mpc8xx_udc_clear_rxbd (rx_cbdp);
+					}
+				}
+
+				/* Advance RX CBD pointer */
+				mpc8xx_udc_advance_rx (&rx_cbdp, epid);
+				ep_ref[epid].prx = rx_cbdp;
+			} else {
+				/* Advance RX CBD pointer */
+				mpc8xx_udc_advance_rx (&rx_cbdp, epid);
+			}
+
+		} while (rx_cbdp != rx_cbdp_base);
+	}
+
+	/* Handle TX events as appropiate, the correct place to do this is
+	 * in a tx routine. Perhaps TX on epn was pre-empted by ep0
+	 */
+
+	if (usbp->usber & USB_E_TXB) {
+		usbp->usber |= USB_E_TXB;
+	}
+
+	if (usbp->usber & (USB_TX_ERRMASK)) {
+		mpc8xx_udc_handle_txerr ();
+	}
+
+	/* Switch to the default state, respond at the default address */
+	if (usbp->usber & USB_E_RESET) {
+		usbp->usber |= USB_E_RESET;
+		usbp->usaddr = 0x00;
+		udc_device->device_state = STATE_DEFAULT;
+	}
+
+	/* if(usbp->usber&USB_E_IDLE){
+	   We could suspend here !
+	   usbp->usber|=USB_E_IDLE;
+	   DBG("idle state change\n");
+	   }
+	   if(usbp->usbs){
+	   We could resume here when IDLE is deasserted !
+	   Not worth doing, so long as we are self powered though.
+	   }
+	*/
+
+	return;
+}
+
+/* udc_endpoint_write
+ *
+ * Write some data to an endpoint
+ */
+int udc_endpoint_write (struct usb_endpoint_instance *epi)
+{
+	int ep = 0;
+	short epid = 1, unnak = 0, ret = 0;
+
+	if (udc_state != STATE_READY) {
+		ERR ("invalid udc_state != STATE_READY!\n");
+		return -1;
+	}
+
+	if (!udc_device || !epi) {
+		return -1;
+	}
+
+	if (udc_device->device_state != STATE_CONFIGURED) {
+		return -1;
+	}
+
+	ep = epi->endpoint_address & 0x03;
+	if (ep >= MAX_ENDPOINTS) {
+		return -1;
+	}
+
+	/* Set NAK for all RX endpoints during TX */
+	for (epid = 1; epid < MAX_ENDPOINTS; epid++) {
+
+		/* Don't set NAK on DATA IN/CONTROL endpoints */
+		if (ep_ref[epid].sc & USB_DIR_IN) {
+			continue;
+		}
+
+		if (!(usbp->usep[epid] & (USEP_THS_NAK | USEP_RHS_NAK))) {
+			unnak |= 1 << epid;
+		}
+
+		mpc8xx_udc_set_nak (epid);
+	}
+
+	mpc8xx_udc_init_tx (&udc_device->bus->endpoint_array[ep],
+			    epi->tx_urb);
+	ret = mpc8xx_udc_ep_tx (&udc_device->bus->endpoint_array[ep]);
+
+	/* Remove temporary NAK */
+	for (epid = 1; epid < MAX_ENDPOINTS; epid++) {
+		if (unnak & (1 << epid)) {
+			udc_unset_nak (epid);
+		}
+	}
+
+	return ret;
+}
+
+/* mpc8xx_udc_assign_urb
+ *
+ * Associate a given urb to an endpoint TX or RX transmit/receive buffers
+ */
+static int mpc8xx_udc_assign_urb (int ep, char direction)
+{
+	struct usb_endpoint_instance *epi = 0;
+
+	if (ep >= MAX_ENDPOINTS) {
+		goto err;
+	}
+	epi = &udc_device->bus->endpoint_array[ep];
+	if (!epi) {
+		goto err;
+	}
+
+	if (!ep_ref[ep].urb) {
+		ep_ref[ep].urb = usbd_alloc_urb (udc_device, udc_device->bus->endpoint_array);
+		if (!ep_ref[ep].urb) {
+			goto err;
+		}
+	} else {
+		ep_ref[ep].urb->actual_length = 0;
+	}
+
+	switch (direction) {
+	case USB_DIR_IN:
+		epi->tx_urb = ep_ref[ep].urb;
+		break;
+	case USB_DIR_OUT:
+		epi->rcv_urb = ep_ref[ep].urb;
+		break;
+	default:
+		goto err;
+	}
+	return 0;
+
+      err:
+	udc_state = STATE_ERROR;
+	return -1;
+}
+
+/* udc_setup_ep
+ *
+ * Associate U-Boot software endpoints to mpc8xx endpoint parameter ram
+ * Isochronous endpoints aren't yet supported!
+ */
+void udc_setup_ep (struct usb_device_instance *device, unsigned int ep,
+		   struct usb_endpoint_instance *epi)
+{
+	uchar direction = 0;
+	int ep_attrib = 0;
+
+	if (epi && (ep < MAX_ENDPOINTS)) {
+
+		if (ep == 0) {
+			if (epi->rcv_attributes != USB_ENDPOINT_XFER_CONTROL
+			    || epi->tx_attributes !=
+			    USB_ENDPOINT_XFER_CONTROL) {
+
+				/* ep0 must be a control endpoint */
+				udc_state = STATE_ERROR;
+				return;
+
+			}
+			if (!(ep_ref[ep].sc & EP_ATTACHED)) {
+				mpc8xx_udc_cbd_attach (ep, epi->tx_packetSize,
+						       epi->rcv_packetSize);
+			}
+			usbp->usep[ep] = 0x0000;
+			return;
+		}
+
+		if ((epi->endpoint_address & USB_ENDPOINT_DIR_MASK)
+		    == USB_DIR_IN) {
+
+			direction = 1;
+			ep_attrib = epi->tx_attributes;
+			epi->rcv_packetSize = 0;
+			ep_ref[ep].sc |= USB_DIR_IN;
+		} else {
+
+			direction = 0;
+			ep_attrib = epi->rcv_attributes;
+			epi->tx_packetSize = 0;
+			ep_ref[ep].sc &= ~USB_DIR_IN;
+		}
+
+		if (mpc8xx_udc_assign_urb (ep, epi->endpoint_address
+					   & USB_ENDPOINT_DIR_MASK)) {
+			return;
+		}
+
+		switch (ep_attrib) {
+		case USB_ENDPOINT_XFER_CONTROL:
+			if (!(ep_ref[ep].sc & EP_ATTACHED)) {
+				mpc8xx_udc_cbd_attach (ep,
+						       epi->tx_packetSize,
+						       epi->rcv_packetSize);
+			}
+			usbp->usep[ep] = ep << 12;
+			epi->rcv_urb = epi->tx_urb = ep_ref[ep].urb;
+
+			break;
+		case USB_ENDPOINT_XFER_BULK:
+		case USB_ENDPOINT_XFER_INT:
+			if (!(ep_ref[ep].sc & EP_ATTACHED)) {
+				if (direction) {
+					mpc8xx_udc_cbd_attach (ep,
+							       epi->tx_packetSize,
+							       0);
+				} else {
+					mpc8xx_udc_cbd_attach (ep,
+							       0,
+							       epi->rcv_packetSize);
+				}
+			}
+			usbp->usep[ep] = (ep << 12) | ((ep_attrib) << 8);
+
+			break;
+		case USB_ENDPOINT_XFER_ISOC:
+		default:
+			serial_printf ("Error endpoint attrib %d>3\n", ep_attrib);
+			udc_state = STATE_ERROR;
+			break;
+		}
+	}
+
+}
+
+/* udc_connect
+ *
+ * Move state, switch on the USB
+ */
+void udc_connect (void)
+{
+	/* Enable pull-up resistor on D+
+	 * TODO: fit a pull-up resistor to drive SE0 for > 2.5us
+	 */
+
+	if (udc_state != STATE_ERROR) {
+		udc_state = STATE_READY;
+		usbp->usmod |= USMOD_EN;
+	}
+}
+
+/* udc_disconnect
+ *
+ * Disconnect is not used but, is included for completeness
+ */
+void udc_disconnect (void)
+{
+	/* Disable pull-up resistor on D-
+	 * TODO: fix a pullup resistor to control this
+	 */
+
+	if (udc_state != STATE_ERROR) {
+		udc_state = STATE_NOT_READY;
+	}
+	usbp->usmod &= ~USMOD_EN;
+}
+
+/* udc_enable
+ *
+ * Grab an EP0 URB, register interest in a subset of USB events
+ */
+void udc_enable (struct usb_device_instance *device)
+{
+	if (udc_state == STATE_ERROR) {
+		return;
+	}
+
+	udc_device = device;
+
+	if (!ep_ref[0].urb) {
+		ep_ref[0].urb = usbd_alloc_urb (device, device->bus->endpoint_array);
+	}
+
+	/* Register interest in all events except SOF, enable transceiver */
+	usbp->usber = 0x03FF;
+	usbp->usbmr = 0x02F7;
+
+	return;
+}
+
+/* udc_disable
+ *
+ * disable the currently hooked device
+ */
+void udc_disable (void)
+{
+	int i = 0;
+
+	if (udc_state == STATE_ERROR) {
+		DBG ("Won't disable UDC. udc_state==STATE_ERROR !\n");
+		return;
+	}
+
+	udc_device = 0;
+
+	for (; i < MAX_ENDPOINTS; i++) {
+		if (ep_ref[i].urb) {
+			usbd_dealloc_urb (ep_ref[i].urb);
+			ep_ref[i].urb = 0;
+		}
+	}
+
+	usbp->usbmr = 0x00;
+	usbp->usmod = ~USMOD_EN;
+	udc_state = STATE_NOT_READY;
+}
+
+/* udc_startup_events
+ *
+ * Enable the specified device
+ */
+void udc_startup_events (struct usb_device_instance *device)
+{
+	udc_enable (device);
+	if (udc_state == STATE_READY) {
+		usbd_device_event_irq (device, DEVICE_CREATE, 0);
+	}
+}
+
+/* udc_set_nak
+ *
+ * Allow upper layers to signal lower layers should not accept more RX data
+ *
+ */
+void udc_set_nak (int epid)
+{
+	if (epid) {
+		mpc8xx_udc_set_nak (epid);
+	}
+}
+
+/* udc_unset_nak
+ *
+ * Suspend sending of NAK tokens for DATA OUT tokens on a given endpoint.
+ * Switch off NAKing on this endpoint to accept more data output from host.
+ *
+ */
+void udc_unset_nak (int epid)
+{
+	if (epid > MAX_ENDPOINTS) {
+		return;
+	}
+
+	if (usbp->usep[epid] & (USEP_THS_NAK | USEP_RHS_NAK)) {
+		usbp->usep[epid] &= ~(USEP_THS_NAK | USEP_RHS_NAK);
+		__asm__ ("eieio");
+	}
+}
+
+/******************************************************************************
+			      Static Linkage
+******************************************************************************/
+
+/* udc_state_transition_up
+ * udc_state_transition_down
+ *
+ * Helper functions to implement device state changes.	The device states and
+ * the events that transition between them are:
+ *
+ *				STATE_ATTACHED
+ *				||	/\
+ *				\/	||
+ *	DEVICE_HUB_CONFIGURED			DEVICE_HUB_RESET
+ *				||	/\
+ *				\/	||
+ *				STATE_POWERED
+ *				||	/\
+ *				\/	||
+ *	DEVICE_RESET				DEVICE_POWER_INTERRUPTION
+ *				||	/\
+ *				\/	||
+ *				STATE_DEFAULT
+ *				||	/\
+ *				\/	||
+ *	DEVICE_ADDRESS_ASSIGNED			DEVICE_RESET
+ *				||	/\
+ *				\/	||
+ *				STATE_ADDRESSED
+ *				||	/\
+ *				\/	||
+ *	DEVICE_CONFIGURED			DEVICE_DE_CONFIGURED
+ *				||	/\
+ *				\/	||
+ *				STATE_CONFIGURED
+ *
+ * udc_state_transition_up transitions up (in the direction from STATE_ATTACHED
+ * to STATE_CONFIGURED) from the specified initial state to the specified final
+ * state, passing through each intermediate state on the way.  If the initial
+ * state is at or above (i.e. nearer to STATE_CONFIGURED) the final state, then
+ * no state transitions will take place.
+ *
+ * udc_state_transition_down transitions down (in the direction from
+ * STATE_CONFIGURED to STATE_ATTACHED) from the specified initial state to the
+ * specified final state, passing through each intermediate state on the way.
+ * If the initial state is at or below (i.e. nearer to STATE_ATTACHED) the final
+ * state, then no state transitions will take place.
+ *
+ */
+
+static void mpc8xx_udc_state_transition_up (usb_device_state_t initial,
+					    usb_device_state_t final)
+{
+	if (initial < final) {
+		switch (initial) {
+		case STATE_ATTACHED:
+			usbd_device_event_irq (udc_device,
+					       DEVICE_HUB_CONFIGURED, 0);
+			if (final == STATE_POWERED)
+				break;
+		case STATE_POWERED:
+			usbd_device_event_irq (udc_device, DEVICE_RESET, 0);
+			if (final == STATE_DEFAULT)
+				break;
+		case STATE_DEFAULT:
+			usbd_device_event_irq (udc_device,
+					       DEVICE_ADDRESS_ASSIGNED, 0);
+			if (final == STATE_ADDRESSED)
+				break;
+		case STATE_ADDRESSED:
+			usbd_device_event_irq (udc_device, DEVICE_CONFIGURED,
+					       0);
+		case STATE_CONFIGURED:
+			break;
+		default:
+			break;
+		}
+	}
+}
+
+static void mpc8xx_udc_state_transition_down (usb_device_state_t initial,
+					      usb_device_state_t final)
+{
+	if (initial > final) {
+		switch (initial) {
+		case STATE_CONFIGURED:
+			usbd_device_event_irq (udc_device,
+					       DEVICE_DE_CONFIGURED, 0);
+			if (final == STATE_ADDRESSED)
+				break;
+		case STATE_ADDRESSED:
+			usbd_device_event_irq (udc_device, DEVICE_RESET, 0);
+			if (final == STATE_DEFAULT)
+				break;
+		case STATE_DEFAULT:
+			usbd_device_event_irq (udc_device,
+					       DEVICE_POWER_INTERRUPTION, 0);
+			if (final == STATE_POWERED)
+				break;
+		case STATE_POWERED:
+			usbd_device_event_irq (udc_device, DEVICE_HUB_RESET,
+					       0);
+		case STATE_ATTACHED:
+			break;
+		default:
+			break;
+		}
+	}
+}
+
+/* mpc8xx_udc_stall
+ *
+ * Force returning of STALL tokens on the given endpoint. Protocol or function
+ * STALL conditions are permissable here
+ */
+static void mpc8xx_udc_stall (unsigned int ep)
+{
+	usbp->usep[ep] |= STALL_BITMASK;
+}
+
+/* mpc8xx_udc_set_nak
+ *
+ * Force returning of NAK responses for the given endpoint as a kind of very
+ * simple flow control
+ */
+static void mpc8xx_udc_set_nak (unsigned int ep)
+{
+	usbp->usep[ep] |= NAK_BITMASK;
+	__asm__ ("eieio");
+}
+
+/* mpc8xx_udc_handle_txerr
+ *
+ * Handle errors relevant to TX. Return a status code to allow calling
+ * indicative of what if anything happened
+ */
+static short mpc8xx_udc_handle_txerr ()
+{
+	short ep = 0, ret = 0;
+
+	for (; ep < TX_RING_SIZE; ep++) {
+		if (usbp->usber & (0x10 << ep)) {
+
+			/* Timeout or underrun */
+			if (tx_cbd[ep]->cbd_sc & 0x06) {
+				ret = 1;
+				mpc8xx_udc_flush_tx_fifo (ep);
+
+			} else {
+				if (usbp->usep[ep] & STALL_BITMASK) {
+					if (!ep) {
+						usbp->usep[ep] &= ~STALL_BITMASK;
+					}
+				}	/* else NAK */
+			}
+			usbp->usber |= (0x10 << ep);
+		}
+	}
+	return ret;
+}
+
+/* mpc8xx_udc_advance_rx
+ *
+ * Advance cbd rx
+ */
+static void mpc8xx_udc_advance_rx (volatile cbd_t ** rx_cbdp, int epid)
+{
+	if ((*rx_cbdp)->cbd_sc & RX_BD_W) {
+		*rx_cbdp = (volatile cbd_t *) (endpoints[epid]->rbase + CONFIG_SYS_IMMR);
+
+	} else {
+		(*rx_cbdp)++;
+	}
+}
+
+
+/* mpc8xx_udc_flush_tx_fifo
+ *
+ * Flush a given TX fifo. Assumes one tx cbd per endpoint
+ */
+static void mpc8xx_udc_flush_tx_fifo (int epid)
+{
+	volatile cbd_t *tx_cbdp = 0;
+
+	if (epid > MAX_ENDPOINTS) {
+		return;
+	}
+
+	/* TX stop */
+	immr->im_cpm.cp_cpcr = ((epid << 2) | 0x1D01);
+	__asm__ ("eieio");
+	while (immr->im_cpm.cp_cpcr & 0x01);
+
+	usbp->uscom = 0x40 | 0;
+
+	/* reset ring */
+	tx_cbdp = (cbd_t *) (endpoints[epid]->tbptr + CONFIG_SYS_IMMR);
+	tx_cbdp->cbd_sc = (TX_BD_I | TX_BD_W);
+
+
+	endpoints[epid]->tptr = endpoints[epid]->tbase;
+	endpoints[epid]->tstate = 0x00;
+	endpoints[epid]->tbcnt = 0x00;
+
+	/* TX start */
+	immr->im_cpm.cp_cpcr = ((epid << 2) | 0x2D01);
+	__asm__ ("eieio");
+	while (immr->im_cpm.cp_cpcr & 0x01);
+
+	return;
+}
+
+/* mpc8xx_udc_flush_rx_fifo
+ *
+ * For the sake of completeness of the namespace, it seems like
+ * a good-design-decision (tm) to include mpc8xx_udc_flush_rx_fifo();
+ * If RX_BD_E is true => a driver bug either here or in an upper layer
+ * not polling frequently enough. If RX_BD_E is true we have told the host
+ * we have accepted data but, the CPM found it had no-where to put that data
+ * which needless to say would be a bad thing.
+ */
+static void mpc8xx_udc_flush_rx_fifo ()
+{
+	int i = 0;
+
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		if (!(rx_cbd[i]->cbd_sc & RX_BD_E)) {
+			ERR ("buf %p used rx data len = 0x%x sc=0x%x!\n",
+			     rx_cbd[i], rx_cbd[i]->cbd_datlen,
+			     rx_cbd[i]->cbd_sc);
+
+		}
+	}
+	ERR ("BUG : Input over-run\n");
+}
+
+/* mpc8xx_udc_clear_rxbd
+ *
+ * Release control of RX CBD to CP.
+ */
+static void mpc8xx_udc_clear_rxbd (volatile cbd_t * rx_cbdp)
+{
+	rx_cbdp->cbd_datlen = 0x0000;
+	rx_cbdp->cbd_sc = ((rx_cbdp->cbd_sc & RX_BD_W) | (RX_BD_E | RX_BD_I));
+	__asm__ ("eieio");
+}
+
+/* mpc8xx_udc_tx_irq
+ *
+ * Parse for tx timeout, control RX or USB reset/busy conditions
+ * Return -1 on timeout, -2 on fatal error, else return zero
+ */
+static int mpc8xx_udc_tx_irq (int ep)
+{
+	int i = 0;
+
+	if (usbp->usber & (USB_TX_ERRMASK)) {
+		if (mpc8xx_udc_handle_txerr ()) {
+			/* Timeout, controlling function must retry send */
+			return -1;
+		}
+	}
+
+	if (usbp->usber & (USB_E_RESET | USB_E_BSY)) {
+		/* Fatal, abandon TX transaction */
+		return -2;
+	}
+
+	if (usbp->usber & USB_E_RXB) {
+		for (i = 0; i < RX_RING_SIZE; i++) {
+			if (!(rx_cbd[i]->cbd_sc & RX_BD_E)) {
+				if ((rx_cbd[i] == ep_ref[0].prx) || ep) {
+					return -2;
+				}
+			}
+		}
+	}
+
+	return 0;
+}
+
+/* mpc8xx_udc_ep_tx
+ *
+ * Transmit in a re-entrant fashion outbound USB packets.
+ * Implement retry/timeout mechanism described in USB specification
+ * Toggle DATA0/DATA1 pids as necessary
+ * Introduces non-standard tx_retry. The USB standard has no scope for slave
+ * devices to give up TX, however tx_retry stops us getting stuck in an endless
+ * TX loop.
+ */
+static int mpc8xx_udc_ep_tx (struct usb_endpoint_instance *epi)
+{
+	struct urb *urb = epi->tx_urb;
+	volatile cbd_t *tx_cbdp = 0;
+	unsigned int ep = 0, pkt_len = 0, x = 0, tx_retry = 0;
+	int ret = 0;
+
+	if (!epi || (epi->endpoint_address & 0x03) >= MAX_ENDPOINTS || !urb) {
+		return -1;
+	}
+
+	ep = epi->endpoint_address & 0x03;
+	tx_cbdp = (cbd_t *) (endpoints[ep]->tbptr + CONFIG_SYS_IMMR);
+
+	if (tx_cbdp->cbd_sc & TX_BD_R || usbp->usber & USB_E_TXB) {
+		mpc8xx_udc_flush_tx_fifo (ep);
+		usbp->usber |= USB_E_TXB;
+	};
+
+	while (tx_retry++ < 100) {
+		ret = mpc8xx_udc_tx_irq (ep);
+		if (ret == -1) {
+			/* ignore timeout here */
+		} else if (ret == -2) {
+			/* Abandon TX */
+			mpc8xx_udc_flush_tx_fifo (ep);
+			return -1;
+		}
+
+		tx_cbdp = (cbd_t *) (endpoints[ep]->tbptr + CONFIG_SYS_IMMR);
+		while (tx_cbdp->cbd_sc & TX_BD_R) {
+		};
+		tx_cbdp->cbd_sc = (tx_cbdp->cbd_sc & TX_BD_W);
+
+		pkt_len = urb->actual_length - epi->sent;
+
+		if (pkt_len > epi->tx_packetSize || pkt_len > EP_MAX_PKT) {
+			pkt_len = MIN (epi->tx_packetSize, EP_MAX_PKT);
+		}
+
+		for (x = 0; x < pkt_len; x++) {
+			*((unsigned char *) (tx_cbdp->cbd_bufaddr + x)) =
+				urb->buffer[epi->sent + x];
+		}
+		tx_cbdp->cbd_datlen = pkt_len;
+		tx_cbdp->cbd_sc |= (CBD_TX_BITMASK | ep_ref[ep].pid);
+		__asm__ ("eieio");
+
+#ifdef __SIMULATE_ERROR__
+		if (++err_poison_test == 2) {
+			err_poison_test = 0;
+			tx_cbdp->cbd_sc &= ~TX_BD_TC;
+		}
+#endif
+
+		usbp->uscom = (USCOM_STR | ep);
+
+		while (!(usbp->usber & USB_E_TXB)) {
+			ret = mpc8xx_udc_tx_irq (ep);
+			if (ret == -1) {
+				/* TX timeout */
+				break;
+			} else if (ret == -2) {
+				if (usbp->usber & USB_E_TXB) {
+					usbp->usber |= USB_E_TXB;
+				}
+				mpc8xx_udc_flush_tx_fifo (ep);
+				return -1;
+			}
+		};
+
+		if (usbp->usber & USB_E_TXB) {
+			usbp->usber |= USB_E_TXB;
+		}
+
+		/* ACK must be present <= 18bit times from TX */
+		if (ret == -1) {
+			continue;
+		}
+
+		/* TX ACK : USB 2.0 8.7.2, Toggle PID, Advance TX */
+		epi->sent += pkt_len;
+		epi->last = MIN (urb->actual_length - epi->sent, epi->tx_packetSize);
+		TOGGLE_TX_PID (ep_ref[ep].pid);
+
+		if (epi->sent >= epi->tx_urb->actual_length) {
+
+			epi->tx_urb->actual_length = 0;
+			epi->sent = 0;
+
+			if (ep_ref[ep].sc & EP_SEND_ZLP) {
+				ep_ref[ep].sc &= ~EP_SEND_ZLP;
+			} else {
+				return 0;
+			}
+		}
+	}
+
+	ERR ("TX fail, endpoint 0x%x tx bytes 0x%x/0x%x\n", ep, epi->sent,
+	     epi->tx_urb->actual_length);
+
+	return -1;
+}
+
+/* mpc8xx_udc_dump_request
+ *
+ * Dump a control request to console
+ */
+static void mpc8xx_udc_dump_request (struct usb_device_request *request)
+{
+	DBG ("bmRequestType:%02x bRequest:%02x wValue:%04x "
+	     "wIndex:%04x wLength:%04x ?\n",
+	     request->bmRequestType,
+	     request->bRequest,
+	     request->wValue, request->wIndex, request->wLength);
+
+	return;
+}
+
+/* mpc8xx_udc_ep0_rx_setup
+ *
+ * Decode received ep0 SETUP packet. return non-zero on error
+ */
+static int mpc8xx_udc_ep0_rx_setup (volatile cbd_t * rx_cbdp)
+{
+	unsigned int x = 0;
+	struct urb *purb = ep_ref[0].urb;
+	struct usb_endpoint_instance *epi =
+		&udc_device->bus->endpoint_array[0];
+
+	for (; x < rx_cbdp->cbd_datlen; x++) {
+		*(((unsigned char *) &ep_ref[0].urb->device_request) + x) =
+			*((unsigned char *) (rx_cbdp->cbd_bufaddr + x));
+	}
+
+	mpc8xx_udc_clear_rxbd (rx_cbdp);
+
+	if (ep0_recv_setup (purb)) {
+		mpc8xx_udc_dump_request (&purb->device_request);
+		return -1;
+	}
+
+	if ((purb->device_request.bmRequestType & USB_REQ_DIRECTION_MASK)
+	    == USB_REQ_HOST2DEVICE) {
+
+		switch (purb->device_request.bRequest) {
+		case USB_REQ_SET_ADDRESS:
+			/* Send the Status OUT ZLP */
+			ep_ref[0].pid = TX_BD_PID_DATA1;
+			purb->actual_length = 0;
+			mpc8xx_udc_init_tx (epi, purb);
+			mpc8xx_udc_ep_tx (epi);
+
+			/* Move to the addressed state */
+			usbp->usaddr = udc_device->address;
+			mpc8xx_udc_state_transition_up (udc_device->device_state,
+							STATE_ADDRESSED);
+			return 0;
+
+		case USB_REQ_SET_CONFIGURATION:
+			if (!purb->device_request.wValue) {
+				/* Respond at default address */
+				usbp->usaddr = 0x00;
+				mpc8xx_udc_state_transition_down (udc_device->device_state,
+								  STATE_ADDRESSED);
+			} else {
+				/* TODO: Support multiple configurations */
+				mpc8xx_udc_state_transition_up (udc_device->device_state,
+								STATE_CONFIGURED);
+				for (x = 1; x < MAX_ENDPOINTS; x++) {
+					if ((udc_device->bus->endpoint_array[x].endpoint_address & USB_ENDPOINT_DIR_MASK)
+					    == USB_DIR_IN) {
+						ep_ref[x].pid = TX_BD_PID_DATA0;
+					} else {
+						ep_ref[x].pid = RX_BD_PID_DATA0;
+					}
+					/* Set configuration must unstall endpoints */
+					usbp->usep[x] &= ~STALL_BITMASK;
+				}
+			}
+			break;
+		default:
+			/* CDC/Vendor specific */
+			break;
+		}
+
+		/* Send ZLP as ACK in Status OUT phase */
+		ep_ref[0].pid = TX_BD_PID_DATA1;
+		purb->actual_length = 0;
+		mpc8xx_udc_init_tx (epi, purb);
+		mpc8xx_udc_ep_tx (epi);
+
+	} else {
+
+		if (purb->actual_length) {
+			ep_ref[0].pid = TX_BD_PID_DATA1;
+			mpc8xx_udc_init_tx (epi, purb);
+
+			if (!(purb->actual_length % EP0_MAX_PACKET_SIZE)) {
+				ep_ref[0].sc |= EP_SEND_ZLP;
+			}
+
+			if (purb->device_request.wValue ==
+			    USB_DESCRIPTOR_TYPE_DEVICE) {
+				if (le16_to_cpu (purb->device_request.wLength)
+				    > purb->actual_length) {
+					/* Send EP0_MAX_PACKET_SIZE bytes
+					 * unless correct size requested.
+					 */
+					if (purb->actual_length > epi->tx_packetSize) {
+						purb->actual_length = epi->tx_packetSize;
+					}
+				}
+			}
+			mpc8xx_udc_ep_tx (epi);
+
+		} else {
+			/* Corrupt SETUP packet? */
+			ERR ("Zero length data or SETUP with DATA-IN phase ?\n");
+			return 1;
+		}
+	}
+	return 0;
+}
+
+/* mpc8xx_udc_init_tx
+ *
+ * Setup some basic parameters for a TX transaction
+ */
+static void mpc8xx_udc_init_tx (struct usb_endpoint_instance *epi,
+				struct urb *tx_urb)
+{
+	epi->sent = 0;
+	epi->last = 0;
+	epi->tx_urb = tx_urb;
+}
+
+/* mpc8xx_udc_ep0_rx
+ *
+ * Receive ep0/control USB data. Parse and possibly send a response.
+ */
+static void mpc8xx_udc_ep0_rx (volatile cbd_t * rx_cbdp)
+{
+	if (rx_cbdp->cbd_sc & RX_BD_PID_SETUP) {
+
+		/* Unconditionally accept SETUP packets */
+		if (mpc8xx_udc_ep0_rx_setup (rx_cbdp)) {
+			mpc8xx_udc_stall (0);
+		}
+
+	} else {
+
+		mpc8xx_udc_clear_rxbd (rx_cbdp);
+
+		if ((rx_cbdp->cbd_datlen - 2)) {
+			/* SETUP with a DATA phase
+			 * outside of SETUP packet.
+			 * Reply with STALL.
+			 */
+			mpc8xx_udc_stall (0);
+		}
+	}
+}
+
+/* mpc8xx_udc_epn_rx
+ *
+ * Receive some data from cbd into USB system urb data abstraction
+ * Upper layers should NAK if there is insufficient RX data space
+ */
+static int mpc8xx_udc_epn_rx (unsigned int epid, volatile cbd_t * rx_cbdp)
+{
+	struct usb_endpoint_instance *epi = 0;
+	struct urb *urb = 0;
+	unsigned int x = 0;
+
+	if (epid >= MAX_ENDPOINTS || !rx_cbdp->cbd_datlen) {
+		return 0;
+	}
+
+	/* USB 2.0 PDF section 8.6.4
+	 * Discard data with invalid PID it is a resend.
+	 */
+	if (ep_ref[epid].pid != (rx_cbdp->cbd_sc & 0xC0)) {
+		return 1;
+	}
+	TOGGLE_RX_PID (ep_ref[epid].pid);
+
+	epi = &udc_device->bus->endpoint_array[epid];
+	urb = epi->rcv_urb;
+
+	for (; x < (rx_cbdp->cbd_datlen - 2); x++) {
+		*((unsigned char *) (urb->buffer + urb->actual_length + x)) =
+			*((unsigned char *) (rx_cbdp->cbd_bufaddr + x));
+	}
+
+	if (x) {
+		usbd_rcv_complete (epi, x, 0);
+		if (ep_ref[epid].urb->status == RECV_ERROR) {
+			DBG ("RX error unset NAK\n");
+			udc_unset_nak (epid);
+		}
+	}
+	return x;
+}
+
+/* mpc8xx_udc_clock_init
+ *
+ * Obtain a clock reference for Full Speed Signaling
+ */
+static void mpc8xx_udc_clock_init (volatile immap_t * immr,
+				   volatile cpm8xx_t * cp)
+{
+
+#if defined(CONFIG_SYS_USB_EXTC_CLK)
+
+	/* This has been tested with a 48MHz crystal on CLK6 */
+	switch (CONFIG_SYS_USB_EXTC_CLK) {
+	case 1:
+		immr->im_ioport.iop_papar |= 0x0100;
+		immr->im_ioport.iop_padir &= ~0x0100;
+		cp->cp_sicr |= 0x24;
+		break;
+	case 2:
+		immr->im_ioport.iop_papar |= 0x0200;
+		immr->im_ioport.iop_padir &= ~0x0200;
+		cp->cp_sicr |= 0x2D;
+		break;
+	case 3:
+		immr->im_ioport.iop_papar |= 0x0400;
+		immr->im_ioport.iop_padir &= ~0x0400;
+		cp->cp_sicr |= 0x36;
+		break;
+	case 4:
+		immr->im_ioport.iop_papar |= 0x0800;
+		immr->im_ioport.iop_padir &= ~0x0800;
+		cp->cp_sicr |= 0x3F;
+		break;
+	default:
+		udc_state = STATE_ERROR;
+		break;
+	}
+
+#elif defined(CONFIG_SYS_USB_BRGCLK)
+
+	/* This has been tested with brgclk == 50MHz */
+	int divisor = 0;
+
+	if (gd->cpu_clk < 48000000L) {
+		ERR ("brgclk is too slow for full-speed USB!\n");
+		udc_state = STATE_ERROR;
+		return;
+	}
+
+	/* Assume the brgclk is 'good enough', we want !(gd->cpu_clk%48MHz)
+	 * but, can /probably/ live with close-ish alternative rates.
+	 */
+	divisor = (gd->cpu_clk / 48000000L) - 1;
+	cp->cp_sicr &= ~0x0000003F;
+
+	switch (CONFIG_SYS_USB_BRGCLK) {
+	case 1:
+		cp->cp_brgc1 |= (divisor | CPM_BRG_EN);
+		cp->cp_sicr &= ~0x2F;
+		break;
+	case 2:
+		cp->cp_brgc2 |= (divisor | CPM_BRG_EN);
+		cp->cp_sicr |= 0x00000009;
+		break;
+	case 3:
+		cp->cp_brgc3 |= (divisor | CPM_BRG_EN);
+		cp->cp_sicr |= 0x00000012;
+		break;
+	case 4:
+		cp->cp_brgc4 = (divisor | CPM_BRG_EN);
+		cp->cp_sicr |= 0x0000001B;
+		break;
+	default:
+		udc_state = STATE_ERROR;
+		break;
+	}
+
+#else
+#error "CONFIG_SYS_USB_EXTC_CLK or CONFIG_SYS_USB_BRGCLK must be defined"
+#endif
+
+}
+
+/* mpc8xx_udc_cbd_attach
+ *
+ * attach a cbd to and endpoint
+ */
+static void mpc8xx_udc_cbd_attach (int ep, uchar tx_size, uchar rx_size)
+{
+
+	if (!tx_cbd[ep] || !rx_cbd[ep] || ep >= MAX_ENDPOINTS) {
+		udc_state = STATE_ERROR;
+		return;
+	}
+
+	if (tx_size > USB_MAX_PKT || rx_size > USB_MAX_PKT ||
+	    (!tx_size && !rx_size)) {
+		udc_state = STATE_ERROR;
+		return;
+	}
+
+	/* Attach CBD to appropiate Parameter RAM Endpoint data structure */
+	if (rx_size) {
+		endpoints[ep]->rbase = (u32) rx_cbd[rx_ct];
+		endpoints[ep]->rbptr = (u32) rx_cbd[rx_ct];
+		rx_ct++;
+
+		if (!ep) {
+
+			endpoints[ep]->rbptr = (u32) rx_cbd[rx_ct];
+			rx_cbd[rx_ct]->cbd_sc |= RX_BD_W;
+			rx_ct++;
+
+		} else {
+			rx_ct += 2;
+			endpoints[ep]->rbptr = (u32) rx_cbd[rx_ct];
+			rx_cbd[rx_ct]->cbd_sc |= RX_BD_W;
+			rx_ct++;
+		}
+
+		/* Where we expect to RX data on this endpoint */
+		ep_ref[ep].prx = rx_cbd[rx_ct - 1];
+	} else {
+
+		ep_ref[ep].prx = 0;
+		endpoints[ep]->rbase = 0;
+		endpoints[ep]->rbptr = 0;
+	}
+
+	if (tx_size) {
+		endpoints[ep]->tbase = (u32) tx_cbd[tx_ct];
+		endpoints[ep]->tbptr = (u32) tx_cbd[tx_ct];
+		tx_ct++;
+	} else {
+		endpoints[ep]->tbase = 0;
+		endpoints[ep]->tbptr = 0;
+	}
+
+	endpoints[ep]->tstate = 0;
+	endpoints[ep]->tbcnt = 0;
+	endpoints[ep]->mrblr = EP_MAX_PKT;
+	endpoints[ep]->rfcr = 0x18;
+	endpoints[ep]->tfcr = 0x18;
+	ep_ref[ep].sc |= EP_ATTACHED;
+
+	DBG ("ep %d rbase 0x%08x rbptr 0x%08x tbase 0x%08x tbptr 0x%08x prx = %p\n",
+		ep, endpoints[ep]->rbase, endpoints[ep]->rbptr,
+		endpoints[ep]->tbase, endpoints[ep]->tbptr,
+		ep_ref[ep].prx);
+
+	return;
+}
+
+/* mpc8xx_udc_cbd_init
+ *
+ * Allocate space for a cbd and allocate TX/RX data space
+ */
+static void mpc8xx_udc_cbd_init (void)
+{
+	int i = 0;
+
+	for (; i < TX_RING_SIZE; i++) {
+		tx_cbd[i] = (cbd_t *)
+			mpc8xx_udc_alloc (sizeof (cbd_t), sizeof (int));
+	}
+
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		rx_cbd[i] = (cbd_t *)
+			mpc8xx_udc_alloc (sizeof (cbd_t), sizeof (int));
+	}
+
+	for (i = 0; i < TX_RING_SIZE; i++) {
+		tx_cbd[i]->cbd_bufaddr =
+			mpc8xx_udc_alloc (EP_MAX_PKT, sizeof (int));
+
+		tx_cbd[i]->cbd_sc = (TX_BD_I | TX_BD_W);
+		tx_cbd[i]->cbd_datlen = 0x0000;
+	}
+
+
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		rx_cbd[i]->cbd_bufaddr =
+			mpc8xx_udc_alloc (EP_MAX_PKT, sizeof (int));
+		rx_cbd[i]->cbd_sc = (RX_BD_I | RX_BD_E);
+		rx_cbd[i]->cbd_datlen = 0x0000;
+
+	}
+
+	return;
+}
+
+/* mpc8xx_udc_endpoint_init
+ *
+ * Attach an endpoint to some dpram
+ */
+static void mpc8xx_udc_endpoint_init (void)
+{
+	int i = 0;
+
+	for (; i < MAX_ENDPOINTS; i++) {
+		endpoints[i] = (usb_epb_t *)
+			mpc8xx_udc_alloc (sizeof (usb_epb_t), 32);
+	}
+}
+
+/* mpc8xx_udc_alloc
+ *
+ * Grab the address of some dpram
+ */
+static u32 mpc8xx_udc_alloc (u32 data_size, u32 alignment)
+{
+	u32 retaddr = address_base;
+
+	while (retaddr % alignment) {
+		retaddr++;
+	}
+	address_base += data_size;
+
+	return retaddr;
+}