Support for PXA27X UDC.

	This Patch adds Support for PXA27X UDC.
	(Rebased to drivers/usb reorganisation)

Signed-off-by: Vivek Kutal <vivek.kutal@azingo.com>
Signed-off-by: Remy Bohmer <linux@bohmer.net>

drivers/serial/usbtty.h

@@ -27,8 +27,10 @@
 #include <usbdevice.h>
 #if defined(CONFIG_PPC)
 #include <usb/mpc8xx_udc.h>
-#elif defined(CONFIG_ARM)
+#elif defined(CONFIG_OMAP1510)
 #include <usb/omap1510_udc.h>
+#elif defined(CONFIG_PXA27X)
+#include <usb/pxa27x_udc.h>
 #endif
 
 #include <version_autogenerated.h>

drivers/usb/gadget/Makefile

@@ -31,6 +31,7 @@ COBJS-y += ep0.o
 COBJS-$(CONFIG_OMAP1510) += omap1510_udc.o
 COBJS-$(CONFIG_OMAP1610) += omap1510_udc.o
 COBJS-$(CONFIG_MPC885_FAMILY) += mpc8xx_udc.o
+COBJS-$(CONFIG_PXA27X) += pxa27x_udc.o
 endif
 
 COBJS	:= $(COBJS-y)

drivers/usb/gadget/pxa27x_udc.c

+/*
+ * PXA27x USB device driver for u-boot.
+ *
+ * Copyright (C) 2007 Rodolfo Giometti <giometti@linux.it>
+ * Copyright (C) 2007 Eurotech S.p.A.  <info@eurotech.it>
+ * Copyright (C) 2008 Vivek Kutal      <vivek.kutal@azingo.com>
+ *
+ * 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
+ *
+ */
+
+
+#include <common.h>
+#include <config.h>
+#include <asm/byteorder.h>
+#include <usbdcore.h>
+#include <usbdcore_ep0.h>
+#include <asm/arch/hardware.h>
+#include <usb/pxa27x_udc.h>
+
+/* number of endpoints on this UDC */
+#define UDC_MAX_ENDPOINTS	24
+
+static struct urb *ep0_urb;
+static struct usb_device_instance *udc_device;
+static int ep0state = EP0_IDLE;
+
+#ifdef USBDDBG
+static void udc_dump_buffer(char *name, u8 *buf, int len)
+{
+	usbdbg("%s - buf %p, len %d", name, buf, len);
+	print_buffer(0, buf, 1, len, 0);
+}
+#else
+#define udc_dump_buffer(name, buf, len)		/* void */
+#endif
+
+static inline void udc_ack_int_UDCCR(int mask)
+{
+	USIR1	= mask | USIR1;
+}
+
+/*
+ * If the endpoint has an active tx_urb, then the next packet of data from the
+ * URB is written to the tx FIFO.
+ * The total amount of data in the urb is given by urb->actual_length.
+ * The maximum amount of data that can be sent in any one packet is given by
+ * endpoint->tx_packetSize.
+ * The number of data bytes from this URB that have already been transmitted
+ * is given by endpoint->sent.
+ * endpoint->last is updated by this routine with the number of data bytes
+ * transmitted in this packet.
+ */
+static int udc_write_urb(struct usb_endpoint_instance *endpoint)
+{
+	struct urb *urb = endpoint->tx_urb;
+	int ep_num = endpoint->endpoint_address & USB_ENDPOINT_NUMBER_MASK;
+	u32 *addr32 = (u32 *) &UDCDN(ep_num);
+	u32 *data32 = (u32 *) urb->buffer;
+	u8  *addr8 = (u8 *) &UDCDN(ep_num);
+	u8  *data8 = (u8 *) urb->buffer;
+	unsigned int i, n, w, b, is_short;
+	int timeout = 2000;	/* 2ms */
+
+	if (!urb || !urb->actual_length)
+		return -1;
+
+	n = MIN(urb->actual_length - endpoint->sent, endpoint->tx_packetSize);
+	if (n <= 0)
+		return -1;
+
+	usbdbg("write urb on ep %d", ep_num);
+#if defined(USBDDBG) && defined(USBDPARANOIA)
+	usbdbg("urb: buf %p, buf_len %d, actual_len %d",
+		urb->buffer, urb->buffer_length, urb->actual_length);
+	usbdbg("endpoint: sent %d, tx_packetSize %d, last %d",
+		endpoint->sent, endpoint->tx_packetSize, endpoint->last);
+#endif
+
+	is_short = n != endpoint->tx_packetSize;
+	w = n / 4;
+	b = n % 4;
+	usbdbg("n %d%s w %d b %d", n, is_short ? "-s" : "", w, b);
+	udc_dump_buffer("urb write", data8 + endpoint->sent, n);
+
+	/* Prepare for data send */
+	if (ep_num)
+		UDCCSN(ep_num) = UDCCSR_PC;
+
+	for (i = 0; i < w; i++)
+		*addr32 = data32[endpoint->sent/4 + i];
+	for (i = 0; i < b; i++)
+		*addr8 = data8[endpoint->sent + w*4 + i];
+
+	/* Set "Packet Complete" if less data then tx_packetSize */
+	if (is_short)
+		UDCCSN(ep_num) = ep_num ? UDCCSR_SP : UDCCSR0_IPR;
+
+	/* Wait for data sent */
+	while (!(UDCCSN(ep_num) & (ep_num ? UDCCSR_PC : UDCCSR0_IPR))) {
+		if (ep_num) {
+			if (timeout-- == 0)
+				return -1;
+			else
+				udelay(1);
+		};
+	}
+	endpoint->last = n;
+
+	if (ep_num) {
+		usbd_tx_complete(endpoint);
+	} else {
+		endpoint->sent += n;
+		endpoint->last -= n;
+	}
+
+	if ((endpoint->tx_urb->actual_length - endpoint->sent) <= 0) {
+		urb->actual_length = 0;
+		endpoint->sent = 0;
+		endpoint->last = 0;
+	}
+
+	if ((endpoint->sent >= urb->actual_length) && (!ep_num)) {
+		usbdbg("ep0 IN stage done");
+		if (is_short)
+			ep0state = EP0_IDLE;
+		else
+			ep0state = EP0_XFER_COMPLETE;
+	}
+
+	return 0;
+}
+
+static int udc_read_urb(struct usb_endpoint_instance *endpoint)
+{
+	struct urb *urb = endpoint->rcv_urb;
+	int ep_num = endpoint->endpoint_address & USB_ENDPOINT_NUMBER_MASK;
+	u32 *addr32 = (u32 *) &UDCDN(ep_num);
+	u32 *data32 = (u32 *) urb->buffer;
+	unsigned int i, n, is_short ;
+
+	usbdbg("read urb on ep %d", ep_num);
+#if defined(USBDDBG) && defined(USBDPARANOIA)
+	usbdbg("urb: buf %p, buf_len %d, actual_len %d",
+		urb->buffer, urb->buffer_length, urb->actual_length);
+	usbdbg("endpoint: rcv_packetSize %d",
+		endpoint->rcv_packetSize);
+#endif
+
+	if (UDCCSN(ep_num) & UDCCSR_BNE)
+		n = UDCBCN(ep_num) & 0x3ff;
+	else /* zlp */
+		n = 0;
+	is_short = n != endpoint->rcv_packetSize;
+
+	usbdbg("n %d%s", n, is_short ? "-s" : "");
+	for (i = 0; i < n; i += 4)
+		data32[urb->actual_length/4 + i/4] = *addr32;
+
+	udc_dump_buffer("urb read", (u8 *) data32, urb->actual_length + n);
+	usbd_rcv_complete(endpoint, n, 0);
+
+	return 0;
+}
+
+static int udc_read_urb_ep0(void)
+{
+	u32 *addr32 = (u32 *) &UDCDN(0);
+	u32 *data32 = (u32 *) ep0_urb->buffer;
+	u8 *addr8 = (u8 *) &UDCDN(0);
+	u8 *data8 = (u8 *) ep0_urb->buffer;
+	unsigned int i, n, w, b;
+
+	n = UDCBCR0;
+	w = n / 4;
+	b = n % 4;
+
+	for (i = 0; i < w; i++) {
+		data32[ep0_urb->actual_length/4 + i] = *addr32;
+		ep0_urb->actual_length += 4;
+	}
+
+	for (i = 0; i < b; i++) {
+		data8[ep0_urb->actual_length + w*4 + i] = *addr8;
+		ep0_urb->actual_length++;
+	}
+
+	UDCCSR0 = UDCCSR0_OPC | UDCCSR0_IPR;
+	if (ep0_urb->actual_length == ep0_urb->device_request.wLength)
+		return 1;
+
+	return 0;
+}
+
+static void udc_handle_ep0(struct usb_endpoint_instance *endpoint)
+{
+	u32 udccsr0 = UDCCSR0;
+	u32 *data = (u32 *) &ep0_urb->device_request;
+	int i;
+
+	usbdbg("udccsr0 %x", udccsr0);
+
+	/* Clear stall status */
+	if (udccsr0 & UDCCSR0_SST) {
+		usberr("clear stall status");
+		UDCCSR0 = UDCCSR0_SST;
+		ep0state = EP0_IDLE;
+	}
+
+	/* previous request unfinished?  non-error iff back-to-back ... */
+	if ((udccsr0 & UDCCSR0_SA) != 0 && ep0state != EP0_IDLE)
+		ep0state = EP0_IDLE;
+
+	switch (ep0state) {
+
+	case EP0_IDLE:
+
+		udccsr0 = UDCCSR0;
+		/* Start control request? */
+		if ((udccsr0 & (UDCCSR0_OPC | UDCCSR0_SA | UDCCSR0_RNE))
+			== (UDCCSR0_OPC | UDCCSR0_SA | UDCCSR0_RNE)) {
+
+			/* Read SETUP packet.
+			 * SETUP packet size is 8 bytes (aka 2 words)
+			 */
+			usbdbg("try reading SETUP packet");
+			for (i = 0; i < 2; i++) {
+				if ((UDCCSR0 & UDCCSR0_RNE) == 0) {
+					usberr("setup packet too short:%d", i);
+					goto stall;
+				}
+				data[i] = UDCDR0;
+			}
+
+			UDCCSR0 |= (UDCCSR0_OPC | UDCCSR0_SA);
+			if ((UDCCSR0 & UDCCSR0_RNE) != 0) {
+				usberr("setup packet too long");
+				goto stall;
+			}
+
+			udc_dump_buffer("ep0 setup read", (u8 *) data, 8);
+
+			if (ep0_urb->device_request.wLength == 0) {
+				usbdbg("Zero Data control Packet\n");
+				if (ep0_recv_setup(ep0_urb)) {
+					usberr("Invalid Setup Packet\n");
+					udc_dump_buffer("ep0 setup read",
+								(u8 *)data, 8);
+					goto stall;
+				}
+				UDCCSR0 = UDCCSR0_IPR;
+				ep0state = EP0_IDLE;
+			} else {
+				/* Check direction */
+				if ((ep0_urb->device_request.bmRequestType &
+						USB_REQ_DIRECTION_MASK)
+						== USB_REQ_HOST2DEVICE) {
+					ep0state = EP0_OUT_DATA;
+					ep0_urb->buffer =
+						(u8 *)ep0_urb->buffer_data;
+					ep0_urb->buffer_length =
+						sizeof(ep0_urb->buffer_data);
+					ep0_urb->actual_length = 0;
+					UDCCSR0 = UDCCSR0_IPR;
+				} else {
+					/* The ep0_recv_setup function has
+					 * already placed our response packet
+					 * data in ep0_urb->buffer and the
+					 * packet length in
+					 * ep0_urb->actual_length.
+					 */
+					if (ep0_recv_setup(ep0_urb)) {
+stall:
+						usberr("Invalid setup packet");
+						udc_dump_buffer("ep0 setup read"
+							, (u8 *) data, 8);
+						ep0state = EP0_IDLE;
+
+						UDCCSR0 = UDCCSR0_SA |
+						UDCCSR0_OPC | UDCCSR0_FST |
+						UDCCS0_FTF;
+
+						return;
+					}
+
+					endpoint->tx_urb = ep0_urb;
+					endpoint->sent = 0;
+					usbdbg("EP0_IN_DATA");
+					ep0state = EP0_IN_DATA;
+					if (udc_write_urb(endpoint) < 0)
+						goto stall;
+
+				}
+			}
+			return;
+		} else if ((udccsr0 & (UDCCSR0_OPC | UDCCSR0_SA))
+			== (UDCCSR0_OPC|UDCCSR0_SA)) {
+			usberr("Setup Active but no data. Stalling ....\n");
+			goto stall;
+		} else {
+			usbdbg("random early IRQs");
+			/* Some random early IRQs:
+			 * - we acked FST
+			 * - IPR cleared
+			 * - OPC got set, without SA (likely status stage)
+			 */
+			UDCCSR0 = udccsr0 & (UDCCSR0_SA | UDCCSR0_OPC);
+		}
+		break;
+
+	case EP0_OUT_DATA:
+
+		if ((udccsr0 & UDCCSR0_OPC) && !(udccsr0 & UDCCSR0_SA)) {
+			if (udc_read_urb_ep0()) {
+read_complete:
+				ep0state = EP0_IDLE;
+				if (ep0_recv_setup(ep0_urb)) {
+					/* Not a setup packet, stall next
+					 * EP0 transaction
+					 */
+					udc_dump_buffer("ep0 setup read",
+							(u8 *) data, 8);
+					usberr("can't parse setup packet\n");
+					goto stall;
+				}
+			}
+		} else if (!(udccsr0 & UDCCSR0_OPC) &&
+				!(udccsr0 & UDCCSR0_IPR)) {
+			if (ep0_urb->device_request.wLength ==
+				ep0_urb->actual_length)
+				goto read_complete;
+
+			usberr("Premature Status\n");
+			ep0state = EP0_IDLE;
+		}
+		break;
+
+	case EP0_IN_DATA:
+		/* GET_DESCRIPTOR etc */
+		if (udccsr0 & UDCCSR0_OPC) {
+			UDCCSR0 = UDCCSR0_OPC | UDCCSR0_FTF;
+			usberr("ep0in premature status");
+			ep0state = EP0_IDLE;
+		} else {
+			/* irq was IPR clearing */
+			if (udc_write_urb(endpoint) < 0) {
+				usberr("ep0_write_error\n");
+				goto stall;
+			}
+		}
+		break;
+
+	case EP0_XFER_COMPLETE:
+		UDCCSR0 = UDCCSR0_IPR;
+		ep0state = EP0_IDLE;
+		break;
+
+	default:
+		usbdbg("Default\n");
+	}
+	USIR0 = USIR0_IR0;
+}
+
+static void udc_handle_ep(struct usb_endpoint_instance *endpoint)
+{
+	int ep_addr = endpoint->endpoint_address;
+	int ep_num = ep_addr & USB_ENDPOINT_NUMBER_MASK;
+	int ep_isout = (ep_addr & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT;
+
+	u32 flags = UDCCSN(ep_num) & (UDCCSR_SST | UDCCSR_TRN);
+	if (flags)
+		UDCCSN(ep_num) = flags;
+
+	if (ep_isout)
+		udc_read_urb(endpoint);
+	else
+		udc_write_urb(endpoint);
+
+	UDCCSN(ep_num) = UDCCSR_PC;
+}
+
+static void udc_state_changed(void)
+{
+	int config, interface, alternate;
+
+	UDCCR |= UDCCR_SMAC;
+
+	config = (UDCCR & UDCCR_ACN) >> UDCCR_ACN_S;
+	interface = (UDCCR & UDCCR_AIN) >> UDCCR_AIN_S;
+	alternate = (UDCCR & UDCCR_AAISN) >> UDCCR_AAISN_S;
+
+	usbdbg("New UDC settings are: conf %d - inter %d - alter %d",
+		config, interface, alternate);
+
+	usbd_device_event_irq(udc_device, DEVICE_CONFIGURED, 0);
+	UDCISR1 = UDCISR1_IRCC;
+}
+
+void udc_irq(void)
+{
+	int handled;
+	struct usb_endpoint_instance *endpoint;
+	int ep_num, i;
+	u32 udcisr0;
+
+	do {
+		handled = 0;
+		/* Suspend Interrupt Request */
+		if (USIR1 & UDCCR_SUSIR) {
+			usbdbg("Suspend\n");
+			udc_ack_int_UDCCR(UDCCR_SUSIR);
+			handled = 1;
+			ep0state = EP0_IDLE;
+		}
+
+		/* Resume Interrupt Request */
+		if (USIR1 & UDCCR_RESIR) {
+			udc_ack_int_UDCCR(UDCCR_RESIR);
+			handled = 1;
+			usbdbg("USB resume\n");
+		}
+
+		if (USIR1 & (1<<31)) {
+			handled = 1;
+			udc_state_changed();
+		}
+
+		/* Reset Interrupt Request */
+		if (USIR1 & UDCCR_RSTIR) {
+			udc_ack_int_UDCCR(UDCCR_RSTIR);
+			handled = 1;
+			usbdbg("Reset\n");
+			usbd_device_event_irq(udc_device, DEVICE_RESET, 0);
+		} else {
+			if (USIR0)
+				usbdbg("UISR0: %x \n", USIR0);
+
+			if (USIR0 & 0x2)
+				USIR0 = 0x2;
+
+			/* Control traffic */
+			if (USIR0  & USIR0_IR0) {
+				handled = 1;
+				udc_handle_ep0(udc_device->bus->endpoint_array);
+				USIR0 = USIR0_IR0;
+			}
+
+			endpoint = udc_device->bus->endpoint_array;
+			for (i = 0; i < udc_device->bus->max_endpoints; i++) {
+				ep_num = (endpoint[i].endpoint_address) &
+						USB_ENDPOINT_NUMBER_MASK;
+				if (!ep_num)
+					continue;
+				udcisr0 = UDCISR0;
+				if (udcisr0 &
+					UDCISR_INT(ep_num, UDC_INT_PACKETCMP)) {
+					UDCISR0 = UDCISR_INT(ep_num,
+							 UDC_INT_PACKETCMP);
+					udc_handle_ep(&endpoint[i]);
+				}
+			}
+		}
+
+	} while (handled);
+}
+
+/* The UDCCR reg contains mask and interrupt status bits,
+ * so using '|=' isn't safe as it may ack an interrupt.
+ */
+#define UDCCR_OEN		(1 << 31)   /* On-the-Go Enable */
+#define UDCCR_MASK_BITS     	(UDCCR_OEN | UDCCR_UDE)
+
+static inline void udc_set_mask_UDCCR(int mask)
+{
+    UDCCR = (UDCCR & UDCCR_MASK_BITS) | (mask & UDCCR_MASK_BITS);
+}
+
+static inline void udc_clear_mask_UDCCR(int mask)
+{
+    UDCCR = (UDCCR & UDCCR_MASK_BITS) & ~(mask & UDCCR_MASK_BITS);
+}
+
+static void pio_irq_enable(int ep_num)
+{
+	if (ep_num < 16)
+		UDCICR0 |= 3 << (ep_num * 2);
+	else {
+		ep_num -= 16;
+		UDCICR1 |= 3 << (ep_num * 2);
+	}
+}
+
+/*
+ * udc_set_nak
+ *
+ * Allow upper layers to signal lower layers should not accept more RX data
+ */
+void udc_set_nak(int ep_num)
+{
+	/* TODO */
+}
+
+/*
+ * 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 ep_num)
+{
+	/* TODO */
+}
+
+int udc_endpoint_write(struct usb_endpoint_instance *endpoint)
+{
+	return udc_write_urb(endpoint);
+}
+
+/* Associate a physical endpoint with endpoint instance */
+void udc_setup_ep(struct usb_device_instance *device, unsigned int id,
+				struct usb_endpoint_instance *endpoint)
+{
+	int ep_num, ep_addr, ep_isout, ep_type, ep_size;
+	int config, interface, alternate;
+	u32 tmp;
+
+	usbdbg("setting up endpoint id %d", id);
+
+	if (!endpoint) {
+		usberr("endpoint void!");
+		return;
+	}
+
+	ep_num = endpoint->endpoint_address & USB_ENDPOINT_NUMBER_MASK;
+	if (ep_num >= UDC_MAX_ENDPOINTS) {
+		usberr("unable to setup ep %d!", ep_num);
+		return;
+	}
+
+	pio_irq_enable(ep_num);
+	if (ep_num == 0) {
+		/* Done for ep0 */
+		return;
+	}
+
+	config = 1;
+	interface = 0;
+	alternate = 0;
+
+	usbdbg("config %d - interface %d - alternate %d",
+		config, interface, alternate);
+
+	ep_addr = endpoint->endpoint_address;
+	ep_num = ep_addr & USB_ENDPOINT_NUMBER_MASK;
+	ep_isout = (ep_addr & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT;
+	ep_type = ep_isout ? endpoint->rcv_attributes : endpoint->tx_attributes;
+	ep_size = ep_isout ? endpoint->rcv_packetSize : endpoint->tx_packetSize;
+
+	usbdbg("addr %x, num %d, dir %s, type %s, packet size %d",
+		ep_addr, ep_num,
+		ep_isout ? "out" : "in",
+		ep_type == USB_ENDPOINT_XFER_ISOC ? "isoc" :
+		ep_type == USB_ENDPOINT_XFER_BULK ? "bulk" :
+		ep_type == USB_ENDPOINT_XFER_INT ? "int" : "???",
+		ep_size
+		);
+
+	/* Configure UDCCRx */
+	tmp = 0;
+	tmp |= (config << UDCCONR_CN_S) & UDCCONR_CN;
+	tmp |= (interface << UDCCONR_IN_S) & UDCCONR_IN;
+	tmp |= (alternate << UDCCONR_AISN_S) & UDCCONR_AISN;
+	tmp |= (ep_num << UDCCONR_EN_S) & UDCCONR_EN;
+	tmp |= (ep_type << UDCCONR_ET_S) & UDCCONR_ET;
+	tmp |= ep_isout ? 0 : UDCCONR_ED;
+	tmp |= (ep_size << UDCCONR_MPS_S) & UDCCONR_MPS;
+	tmp |= UDCCONR_EE;
+
+	UDCCN(ep_num) = tmp;
+
+	usbdbg("UDCCR%c = %x", 'A' + ep_num-1, UDCCN(ep_num));
+	usbdbg("UDCCSR%c = %x", 'A' + ep_num-1, UDCCSN(ep_num));
+}
+
+#define CONFIG_USB_DEV_PULLUP_GPIO 87
+
+/* Connect the USB device to the bus */
+void udc_connect(void)
+{
+	usbdbg("UDC connect");
+
+	/* Turn on the USB connection by enabling the pullup resistor */
+	set_GPIO_mode(CONFIG_USB_DEV_PULLUP_GPIO | GPIO_OUT);
+	GPSR(CONFIG_USB_DEV_PULLUP_GPIO) = GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO);
+}
+
+/* Disconnect the USB device to the bus */
+void udc_disconnect(void)
+{
+	usbdbg("UDC disconnect");
+
+	/* Turn off the USB connection by disabling the pullup resistor */
+	GPCR(CONFIG_USB_DEV_PULLUP_GPIO) = GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO);
+}
+
+/* Switch on the UDC */
+void udc_enable(struct usb_device_instance *device)
+{
+
+	ep0state = EP0_IDLE;
+	CKEN |= CKEN11_USB;
+
+	/* enable endpoint 0, A, B's Packet Complete Interrupt. */
+	UDCICR0 = 0x0000003f;
+	UDCICR1 = 0xa8000000;
+
+	/* clear the interrupt status/control registers */
+	UDCISR0 = 0xffffffff;
+	UDCISR1 = 0xffffffff;
+
+	/* set UDC-enable */
+	udc_set_mask_UDCCR(UDCCR_UDE);
+
+	udc_device = device;
+	if (!ep0_urb)
+		ep0_urb = usbd_alloc_urb(udc_device,
+				udc_device->bus->endpoint_array);
+	else
+		usbinfo("ep0_urb %p already allocated", ep0_urb);
+
+	usbdbg("UDC Enabled\n");
+}
+
+/* Need to check this again */
+void udc_disable(void)
+{
+	usbdbg("disable UDC");
+
+	udc_clear_mask_UDCCR(UDCCR_UDE);
+
+	/* Disable clock for USB device */
+	CKEN &= ~CKEN11_USB;
+
+	/* Free ep0 URB */
+	if (ep0_urb) {
+		usbd_dealloc_urb(ep0_urb);
+		ep0_urb = NULL;
+	}
+
+	/* Reset device pointer */
+	udc_device = NULL;
+}
+
+/* Allow udc code to do any additional startup */
+void udc_startup_events(struct usb_device_instance *device)
+{
+	/* The DEVICE_INIT event puts the USB device in the state STATE_INIT */
+	usbd_device_event_irq(device, DEVICE_INIT, 0);
+
+	/* The DEVICE_CREATE event puts the USB device in the state
+	 * STATE_ATTACHED */
+	usbd_device_event_irq(device, DEVICE_CREATE, 0);
+
+	/* Some USB controller driver implementations signal
+	 * DEVICE_HUB_CONFIGURED and DEVICE_RESET events here.
+	 * DEVICE_HUB_CONFIGURED causes a transition to the state
+	 * STATE_POWERED, and DEVICE_RESET causes a transition to
+	 * the state STATE_DEFAULT.
+	 */
+	udc_enable(device);
+}
+
+/* Initialize h/w stuff */
+int udc_init(void)
+{
+	udc_device = NULL;
+	usbdbg("PXA27x usbd start");
+
+	/* Disable the UDC */
+	udc_clear_mask_UDCCR(UDCCR_UDE);
+
+	/* Disable clock for USB device */
+	CKEN &= ~CKEN11_USB;
+
+	/* Disable IRQs: we don't use them */
+	UDCICR0 = UDCICR1 = 0;
+
+	return 0;
+}

include/usb/pxa27x_udc.h

+/*
+ * PXA27x register declarations and HCD data structures
+ *
+ * Copyright (C) 2007 Rodolfo Giometti <giometti@linux.it>
+ * Copyright (C) 2007 Eurotech S.p.A. <info@eurotech.it>
+ *
+ * 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
+ */
+
+
+#ifndef __PXA270X_UDC_H__
+#define __PXA270X_UDC_H__
+
+#include <asm/byteorder.h>
+
+/* Endpoint 0 states */
+#define EP0_IDLE		0
+#define EP0_IN_DATA		1
+#define EP0_OUT_DATA		2
+#define EP0_XFER_COMPLETE	3
+
+
+/* Endpoint parameters */
+#define MAX_ENDPOINTS		4
+#define EP_MAX_PACKET_SIZE	64
+
+#define EP0_MAX_PACKET_SIZE     16
+#define UDC_OUT_ENDPOINT        0x02
+#define UDC_OUT_PACKET_SIZE     EP_MAX_PACKET_SIZE
+#define UDC_IN_ENDPOINT         0x01
+#define UDC_IN_PACKET_SIZE      EP_MAX_PACKET_SIZE
+#define UDC_INT_ENDPOINT        0x05
+#define UDC_INT_PACKET_SIZE     EP_MAX_PACKET_SIZE
+#define UDC_BULK_PACKET_SIZE    EP_MAX_PACKET_SIZE
+
+void udc_irq(void);
+/* Flow control */
+void udc_set_nak(int epid);
+void udc_unset_nak(int epid);
+
+/* Higher level functions for abstracting away from specific device */
+int udc_endpoint_write(struct usb_endpoint_instance *endpoint);
+
+int  udc_init(void);
+
+void udc_enable(struct usb_device_instance *device);
+void udc_disable(void);
+
+void udc_connect(void);
+void udc_disconnect(void);
+
+void udc_startup_events(struct usb_device_instance *device);
+void udc_setup_ep(struct usb_device_instance *device,
+	 unsigned int ep, struct usb_endpoint_instance *endpoint);
+
+#endif