SPEAr : usbd driver support for SPEAr SoCs

SPEAr SoCs contain a synopsys usb device controller.
USB Device IP can work in 2 modes
- DMA mode
- Slave mode

The driver adds support only for slave mode operation of usb
device IP. This driver is used along with standard USBTTY
driver to obtain a tty interface over USB on the host

Signed-off-by: Vipin <vipin.kumar@st.com>

3 files changed, 1001 insertions, 0 deletions

diff --git a/drivers/serial/usbtty.h b/drivers/serial/usbtty.h
index 6b6c4a1..a23169a 100644..100755
--- a/drivers/serial/usbtty.h
+++ b/drivers/serial/usbtty.h
@@ -33,6 +33,8 @@
 #include <usb/musb_udc.h>
 #elif defined(CONFIG_PXA27X)
 #include <usb/pxa27x_udc.h>
+#elif defined(CONFIG_SPEAR3XX) || defined(CONFIG_SPEAR600)
+#include <usb/spr_udc.h>
 #endif
 
 #include <version_autogenerated.h>
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 2a19b1e..1d7362d 100644..100755
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -32,6 +32,7 @@ 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
+COBJS-$(CONFIG_SPEARUDC) += spr_udc.o
 endif
 
 COBJS	:= $(COBJS-y)
diff --git a/drivers/usb/gadget/spr_udc.c b/drivers/usb/gadget/spr_udc.c
new file mode 100755
index 0000000..f2b06d6
--- /dev/null
+++ b/drivers/usb/gadget/spr_udc.c
@@ -0,0 +1,998 @@
+/*
+ * Based on drivers/usb/gadget/omap1510_udc.c
+ * TI OMAP1510 USB bus interface driver
+ *
+ * (C) Copyright 2009
+ * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 <asm/io.h>
+
+#include <usbdevice.h>
+#include "ep0.h"
+#include <usb/spr_udc.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/spr_misc.h>
+
+#define UDC_INIT_MDELAY		80	/* Device settle delay */
+
+/* Some kind of debugging output... */
+#ifndef DEBUG_SPRUSBTTY
+#define UDCDBG(str)
+#define UDCDBGA(fmt, args...)
+#else
+#define UDCDBG(str) serial_printf(str "\n")
+#define UDCDBGA(fmt, args...) serial_printf(fmt "\n", ##args)
+#endif
+
+static struct urb *ep0_urb;
+static struct usb_device_instance *udc_device;
+
+static struct plug_regs *const plug_regs_p =
+    (struct plug_regs * const)CONFIG_SYS_PLUG_BASE;
+static struct udc_regs *const udc_regs_p =
+    (struct udc_regs * const)CONFIG_SYS_USBD_BASE;
+static struct udc_endp_regs *const outep_regs_p =
+    &((struct udc_regs * const)CONFIG_SYS_USBD_BASE)->out_regs[0];
+static struct udc_endp_regs *const inep_regs_p =
+    &((struct udc_regs * const)CONFIG_SYS_USBD_BASE)->in_regs[0];
+
+/*
+ * udc_state_transition - Write the next packet to TxFIFO.
+ * @initial:	Initial state.
+ * @final:	Final state.
+ *
+ * Helper function 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 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 also 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.
+ *
+ * This function must only be called with interrupts disabled.
+ */
+static void udc_state_transition(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;
+		}
+	} else 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;
+		}
+	}
+}
+
+/* Stall endpoint */
+static void udc_stall_ep(u32 ep_num)
+{
+	writel(readl(&inep_regs_p[ep_num].endp_cntl) | ENDP_CNTL_STALL,
+	       &inep_regs_p[ep_num].endp_cntl);
+
+	writel(readl(&outep_regs_p[ep_num].endp_cntl) | ENDP_CNTL_STALL,
+	       &outep_regs_p[ep_num].endp_cntl);
+}
+
+static void *get_fifo(int ep_num, int in)
+{
+	u32 *fifo_ptr = (u32 *)CONFIG_SYS_FIFO_BASE;
+
+	switch (ep_num) {
+	case UDC_EP3:
+		fifo_ptr += readl(&inep_regs_p[1].endp_bsorfn);
+		/* break intentionally left out */
+
+	case UDC_EP1:
+		fifo_ptr += readl(&inep_regs_p[0].endp_bsorfn);
+		/* break intentionally left out */
+
+	case UDC_EP0:
+	default:
+		if (in) {
+			fifo_ptr +=
+			    readl(&outep_regs_p[2].endp_maxpacksize) >> 16;
+			/* break intentionally left out */
+		} else {
+			break;
+		}
+
+	case UDC_EP2:
+		fifo_ptr += readl(&outep_regs_p[0].endp_maxpacksize) >> 16;
+		/* break intentionally left out */
+	}
+
+	return (void *)fifo_ptr;
+}
+
+static int usbgetpckfromfifo(int epNum, u8 *bufp, u32 len)
+{
+	u8 *fifo_ptr = (u8 *)get_fifo(epNum, 0);
+	u32 i, nw, nb;
+	u32 *wrdp;
+	u8 *bytp;
+
+	if (readl(&udc_regs_p->dev_stat) & DEV_STAT_RXFIFO_EMPTY)
+		return -1;
+
+	nw = len / sizeof(u32);
+	nb = len % sizeof(u32);
+
+	wrdp = (u32 *)bufp;
+	for (i = 0; i < nw; i++) {
+		writel(readl(fifo_ptr), wrdp);
+		wrdp++;
+	}
+
+	bytp = (u8 *)wrdp;
+	for (i = 0; i < nb; i++) {
+		writeb(readb(fifo_ptr), bytp);
+		fifo_ptr++;
+		bytp++;
+	}
+	readl(&outep_regs_p[epNum].write_done);
+
+	return 0;
+}
+
+static void usbputpcktofifo(int epNum, u8 *bufp, u32 len)
+{
+	u32 i, nw, nb;
+	u32 *wrdp;
+	u8 *bytp;
+	u8 *fifo_ptr = get_fifo(epNum, 1);
+
+	nw = len / sizeof(int);
+	nb = len % sizeof(int);
+	wrdp = (u32 *)bufp;
+	for (i = 0; i < nw; i++) {
+		writel(*wrdp, fifo_ptr);
+		wrdp++;
+	}
+
+	bytp = (u8 *)wrdp;
+	for (i = 0; i < nb; i++) {
+		writeb(*bytp, fifo_ptr);
+		fifo_ptr++;
+		bytp++;
+	}
+}
+
+/*
+ * spear_write_noniso_tx_fifo - Write the next packet to TxFIFO.
+ * @endpoint:		Endpoint pointer.
+ *
+ * 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 void spear_write_noniso_tx_fifo(struct usb_endpoint_instance
+				       *endpoint)
+{
+	struct urb *urb = endpoint->tx_urb;
+	int align;
+
+	if (urb) {
+		u32 last;
+
+		UDCDBGA("urb->buffer %p, buffer_length %d, actual_length %d",
+			urb->buffer, urb->buffer_length, urb->actual_length);
+
+		last = MIN(urb->actual_length - endpoint->sent,
+			   endpoint->tx_packetSize);
+
+		if (last) {
+			u8 *cp = urb->buffer + endpoint->sent;
+
+			/*
+			 * This ensures that USBD packet fifo is accessed
+			 * - through word aligned pointer or
+			 * - through non word aligned pointer but only
+			 *   with a max length to make the next packet
+			 *   word aligned
+			 */
+
+			align = ((ulong)cp % sizeof(int));
+			if (align)
+				last = MIN(last, sizeof(int) - align);
+
+			UDCDBGA("endpoint->sent %d, tx_packetSize %d, last %d",
+				endpoint->sent, endpoint->tx_packetSize, last);
+
+			usbputpcktofifo(endpoint->endpoint_address &
+					USB_ENDPOINT_NUMBER_MASK, cp, last);
+		}
+		endpoint->last = last;
+	}
+}
+
+/*
+ * Handle SETUP USB interrupt.
+ * This function implements TRM Figure 14-14.
+ */
+static void spear_udc_setup(struct usb_endpoint_instance *endpoint)
+{
+	u8 *datap = (u8 *)&ep0_urb->device_request;
+	int ep_addr = endpoint->endpoint_address;
+
+	UDCDBG("-> Entering device setup");
+	usbgetpckfromfifo(ep_addr, datap, 8);
+
+	/* Try to process setup packet */
+	if (ep0_recv_setup(ep0_urb)) {
+		/* Not a setup packet, stall next EP0 transaction */
+		udc_stall_ep(0);
+		UDCDBG("can't parse setup packet, still waiting for setup");
+		return;
+	}
+
+	/* Check direction */
+	if ((ep0_urb->device_request.bmRequestType & USB_REQ_DIRECTION_MASK)
+	    == USB_REQ_HOST2DEVICE) {
+		UDCDBG("control write on EP0");
+		if (le16_to_cpu(ep0_urb->device_request.wLength)) {
+			/* Stall this request */
+			UDCDBG("Stalling unsupported EP0 control write data "
+			       "stage.");
+			udc_stall_ep(0);
+		}
+	} else {
+
+		UDCDBG("control read on EP0");
+		/*
+		 * 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.
+		 */
+		endpoint->tx_urb = ep0_urb;
+		endpoint->sent = 0;
+		/*
+		 * Write packet data to the FIFO.  spear_write_noniso_tx_fifo
+		 * will update endpoint->last with the number of bytes written
+		 * to the FIFO.
+		 */
+		spear_write_noniso_tx_fifo(endpoint);
+
+		writel(0x0, &inep_regs_p[ep_addr].write_done);
+	}
+
+	udc_unset_nak(endpoint->endpoint_address);
+
+	UDCDBG("<- Leaving device setup");
+}
+
+/*
+ * Handle endpoint 0 RX interrupt
+ */
+static void spear_udc_ep0_rx(struct usb_endpoint_instance *endpoint)
+{
+	u8 dummy[64];
+
+	UDCDBG("RX on EP0");
+
+	/* Check direction */
+	if ((ep0_urb->device_request.bmRequestType
+	     & USB_REQ_DIRECTION_MASK) == USB_REQ_HOST2DEVICE) {
+		/*
+		 * This rx interrupt must be for a control write data
+		 * stage packet.
+		 *
+		 * We don't support control write data stages.
+		 * We should never end up here.
+		 */
+
+		UDCDBG("Stalling unexpected EP0 control write "
+		       "data stage packet");
+		udc_stall_ep(0);
+	} else {
+		/*
+		 * This rx interrupt must be for a control read status
+		 * stage packet.
+		 */
+		UDCDBG("ACK on EP0 control read status stage packet");
+		u32 len = (readl(&outep_regs_p[0].endp_status) >> 11) & 0xfff;
+		usbgetpckfromfifo(0, dummy, len);
+	}
+}
+
+/*
+ * Handle endpoint 0 TX interrupt
+ */
+static void spear_udc_ep0_tx(struct usb_endpoint_instance *endpoint)
+{
+	struct usb_device_request *request = &ep0_urb->device_request;
+	int ep_addr;
+
+	UDCDBG("TX on EP0");
+
+	/* Check direction */
+	if ((request->bmRequestType & USB_REQ_DIRECTION_MASK) ==
+	    USB_REQ_HOST2DEVICE) {
+		/*
+		 * This tx interrupt must be for a control write status
+		 * stage packet.
+		 */
+		UDCDBG("ACK on EP0 control write status stage packet");
+	} else {
+		/*
+		 * This tx interrupt must be for a control read data
+		 * stage packet.
+		 */
+		int wLength = le16_to_cpu(request->wLength);
+
+		/*
+		 * Update our count of bytes sent so far in this
+		 * transfer.
+		 */
+		endpoint->sent += endpoint->last;
+
+		/*
+		 * We are finished with this transfer if we have sent
+		 * all of the bytes in our tx urb (urb->actual_length)
+		 * unless we need a zero-length terminating packet.  We
+		 * need a zero-length terminating packet if we returned
+		 * fewer bytes than were requested (wLength) by the host,
+		 * and the number of bytes we returned is an exact
+		 * multiple of the packet size endpoint->tx_packetSize.
+		 */
+		if ((endpoint->sent == ep0_urb->actual_length) &&
+		    ((ep0_urb->actual_length == wLength) ||
+		     (endpoint->last != endpoint->tx_packetSize))) {
+			/* Done with control read data stage. */
+			UDCDBG("control read data stage complete");
+		} else {
+			/*
+			 * We still have another packet of data to send
+			 * in this control read data stage or else we
+			 * need a zero-length terminating packet.
+			 */
+			UDCDBG("ACK control read data stage packet");
+			spear_write_noniso_tx_fifo(endpoint);
+
+			ep_addr = endpoint->endpoint_address;
+			writel(0x0, &inep_regs_p[ep_addr].write_done);
+		}
+	}
+}
+
+static struct usb_endpoint_instance *spear_find_ep(int ep)
+{
+	int i;
+
+	for (i = 0; i < udc_device->bus->max_endpoints; i++) {
+		if ((udc_device->bus->endpoint_array[i].endpoint_address &
+		     USB_ENDPOINT_NUMBER_MASK) == ep)
+			return &udc_device->bus->endpoint_array[i];
+	}
+	return NULL;
+}
+
+/*
+ * Handle RX transaction on non-ISO endpoint.
+ * The ep argument is a physical endpoint number for a non-ISO IN endpoint
+ * in the range 1 to 15.
+ */
+static void spear_udc_epn_rx(int ep)
+{
+	int nbytes = 0;
+	struct urb *urb;
+	struct usb_endpoint_instance *endpoint = spear_find_ep(ep);
+
+	if (endpoint) {
+		urb = endpoint->rcv_urb;
+
+		if (urb) {
+			u8 *cp = urb->buffer + urb->actual_length;
+
+			nbytes = (readl(&outep_regs_p[ep].endp_status) >> 11) &
+			    0xfff;
+			usbgetpckfromfifo(ep, cp, nbytes);
+			usbd_rcv_complete(endpoint, nbytes, 0);
+		}
+	}
+}
+
+/*
+ * Handle TX transaction on non-ISO endpoint.
+ * The ep argument is a physical endpoint number for a non-ISO IN endpoint
+ * in the range 16 to 30.
+ */
+static void spear_udc_epn_tx(int ep)
+{
+	struct usb_endpoint_instance *endpoint = spear_find_ep(ep);
+
+	/*
+	 * We need to transmit a terminating zero-length packet now if
+	 * we have sent all of the data in this URB and the transfer
+	 * size was an exact multiple of the packet size.
+	 */
+	if (endpoint && endpoint->tx_urb && endpoint->tx_urb->actual_length) {
+		if (endpoint->last == endpoint->tx_packetSize) {
+			/* handle zero length packet here */
+			writel(0x0, &inep_regs_p[ep].write_done);
+		}
+		/* retire the data that was just sent */
+		usbd_tx_complete(endpoint);
+		/*
+		 * Check to see if we have more data ready to transmit
+		 * now.
+		 */
+		if (endpoint->tx_urb && endpoint->tx_urb->actual_length) {
+			/* write data to FIFO */
+			spear_write_noniso_tx_fifo(endpoint);
+			writel(0x0, &inep_regs_p[ep].write_done);
+
+		} else if (endpoint->tx_urb
+			   && (endpoint->tx_urb->actual_length == 0)) {
+			/* udc_set_nak(ep); */
+		}
+	}
+}
+
+/*
+ * Start of public functions.
+ */
+
+/* Called to start packet transmission. */
+int udc_endpoint_write(struct usb_endpoint_instance *endpoint)
+{
+	udc_unset_nak(endpoint->endpoint_address & USB_ENDPOINT_NUMBER_MASK);
+	return 0;
+}
+
+/* Start to initialize h/w stuff */
+int udc_init(void)
+{
+	int i;
+	u32 plug_st;
+
+	udc_device = NULL;
+
+	UDCDBG("starting");
+
+	readl(&plug_regs_p->plug_pending);
+
+	udc_disconnect();
+
+	for (i = 0; i < UDC_INIT_MDELAY; i++)
+		udelay(1000);
+
+	plug_st = readl(&plug_regs_p->plug_state);
+	writel(plug_st | PLUG_STATUS_EN, &plug_regs_p->plug_state);
+
+	writel(~0x0, &udc_regs_p->endp_int);
+	writel(~0x0, &udc_regs_p->dev_int_mask);
+	writel(~0x0, &udc_regs_p->endp_int_mask);
+
+	writel(DEV_CONF_FS_SPEED | DEV_CONF_REMWAKEUP | DEV_CONF_SELFPOW |
+	       /* Dev_Conf_SYNCFRAME | */
+	       DEV_CONF_PHYINT_16, &udc_regs_p->dev_conf);
+
+	writel(0x0, &udc_regs_p->dev_cntl);
+
+	/* Clear all interrupts pending */
+	writel(DEV_INT_MSK, &udc_regs_p->dev_int);
+
+	return 0;
+}
+
+/*
+ * udc_setup_ep - setup endpoint
+ * Associate a physical endpoint with endpoint_instance
+ */
+void udc_setup_ep(struct usb_device_instance *device,
+		  u32 ep, struct usb_endpoint_instance *endpoint)
+{
+	UDCDBGA("setting up endpoint addr %x", endpoint->endpoint_address);
+	int ep_addr;
+	int ep_num, ep_type;
+	int packet_size;
+	int buffer_size;
+	int attributes;
+	char *tt;
+	u32 endp_intmask;
+
+	tt = getenv("usbtty");
+	if (!tt)
+		tt = "generic";
+
+	ep_addr = endpoint->endpoint_address;
+	ep_num = ep_addr & USB_ENDPOINT_NUMBER_MASK;
+
+	if ((ep_addr & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) {
+		/* IN endpoint */
+		packet_size = endpoint->tx_packetSize;
+		buffer_size = packet_size * 2;
+		attributes = endpoint->tx_attributes;
+	} else {
+		/* OUT endpoint */
+		packet_size = endpoint->rcv_packetSize;
+		buffer_size = packet_size * 2;
+		attributes = endpoint->rcv_attributes;
+	}
+
+	switch (attributes & USB_ENDPOINT_XFERTYPE_MASK) {
+	case USB_ENDPOINT_XFER_CONTROL:
+		ep_type = ENDP_EPTYPE_CNTL;
+		break;
+	case USB_ENDPOINT_XFER_BULK:
+	default:
+		ep_type = ENDP_EPTYPE_BULK;
+		break;
+	case USB_ENDPOINT_XFER_INT:
+		ep_type = ENDP_EPTYPE_INT;
+		break;
+	case USB_ENDPOINT_XFER_ISOC:
+		ep_type = ENDP_EPTYPE_ISO;
+		break;
+	}
+
+	struct udc_endp_regs *out_p = &outep_regs_p[ep_num];
+	struct udc_endp_regs *in_p = &inep_regs_p[ep_num];
+
+	if (!ep_addr) {
+		/* Setup endpoint 0 */
+		buffer_size = packet_size;
+
+		writel(readl(&in_p->endp_cntl) | ENDP_CNTL_CNAK,
+		       &in_p->endp_cntl);
+
+		writel(readl(&out_p->endp_cntl) | ENDP_CNTL_CNAK,
+		       &out_p->endp_cntl);
+
+		writel(ENDP_CNTL_CONTROL | ENDP_CNTL_FLUSH, &in_p->endp_cntl);
+
+		writel(buffer_size / sizeof(int), &in_p->endp_bsorfn);
+
+		writel(packet_size, &in_p->endp_maxpacksize);
+
+		writel(ENDP_CNTL_CONTROL | ENDP_CNTL_RRDY, &out_p->endp_cntl);
+
+		writel(packet_size | ((buffer_size / sizeof(int)) << 16),
+		       &out_p->endp_maxpacksize);
+
+		writel((packet_size << 19) | ENDP_EPTYPE_CNTL,
+		       &udc_regs_p->udc_endp_reg[ep_num]);
+
+	} else if ((ep_addr & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) {
+		/* Setup the IN endpoint */
+		writel(0x0, &in_p->endp_status);
+		writel((ep_type << 4) | ENDP_CNTL_RRDY, &in_p->endp_cntl);
+		writel(buffer_size / sizeof(int), &in_p->endp_bsorfn);
+		writel(packet_size, &in_p->endp_maxpacksize);
+
+		if (!strcmp(tt, "cdc_acm")) {
+			if (ep_type == ENDP_EPTYPE_INT) {
+				/* Conf no. 1 Interface no. 0 */
+				writel((packet_size << 19) |
+				       ENDP_EPDIR_IN | (1 << 7) |
+				       (0 << 11) | (ep_type << 5) | ep_num,
+				       &udc_regs_p->udc_endp_reg[ep_num]);
+			} else {
+				/* Conf no. 1 Interface no. 1 */
+				writel((packet_size << 19) |
+				       ENDP_EPDIR_IN | (1 << 7) |
+				       (1 << 11) | (ep_type << 5) | ep_num,
+				       &udc_regs_p->udc_endp_reg[ep_num]);
+			}
+		} else {
+			/* Conf no. 1 Interface no. 0 */
+			writel((packet_size << 19) |
+			       ENDP_EPDIR_IN | (1 << 7) |
+			       (0 << 11) | (ep_type << 5) | ep_num,
+			       &udc_regs_p->udc_endp_reg[ep_num]);
+		}
+
+	} else {
+		/* Setup the OUT endpoint */
+		writel(0x0, &out_p->endp_status);
+		writel((ep_type << 4) | ENDP_CNTL_RRDY, &out_p->endp_cntl);
+		writel(packet_size | ((buffer_size / sizeof(int)) << 16),
+		       &out_p->endp_maxpacksize);
+
+		if (!strcmp(tt, "cdc_acm")) {
+			writel((packet_size << 19) |
+			       ENDP_EPDIR_OUT | (1 << 7) |
+			       (1 << 11) | (ep_type << 5) | ep_num,
+			       &udc_regs_p->udc_endp_reg[ep_num]);
+		} else {
+			writel((packet_size << 19) |
+			       ENDP_EPDIR_OUT | (1 << 7) |
+			       (0 << 11) | (ep_type << 5) | ep_num,
+			       &udc_regs_p->udc_endp_reg[ep_num]);
+		}
+
+	}
+
+	endp_intmask = readl(&udc_regs_p->endp_int_mask);
+	endp_intmask &= ~((1 << ep_num) | 0x10000 << ep_num);
+	writel(endp_intmask, &udc_regs_p->endp_int_mask);
+}
+
+/* Turn on the USB connection by enabling the pullup resistor */
+void udc_connect(void)
+{
+	u32 plug_st;
+
+	plug_st = readl(&plug_regs_p->plug_state);
+	plug_st &= ~(PLUG_STATUS_PHY_RESET | PLUG_STATUS_PHY_MODE);
+	writel(plug_st, &plug_regs_p->plug_state);
+}
+
+/* Turn off the USB connection by disabling the pullup resistor */
+void udc_disconnect(void)
+{
+	u32 plug_st;
+
+	plug_st = readl(&plug_regs_p->plug_state);
+	plug_st |= (PLUG_STATUS_PHY_RESET | PLUG_STATUS_PHY_MODE);
+	writel(plug_st, &plug_regs_p->plug_state);
+}
+
+/* Switch on the UDC */
+void udc_enable(struct usb_device_instance *device)
+{
+	UDCDBGA("enable device %p, status %d", device, device->status);
+
+	/* Save the device structure pointer */
+	udc_device = device;
+
+	/* Setup ep0 urb */
+	if (!ep0_urb) {
+		ep0_urb =
+		    usbd_alloc_urb(udc_device, udc_device->bus->endpoint_array);
+	} else {
+		serial_printf("udc_enable: ep0_urb already allocated %p\n",
+			      ep0_urb);
+	}
+
+	writel(DEV_INT_SOF, &udc_regs_p->dev_int_mask);
+}
+
+/**
+ * udc_startup - 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.
+	 * The SPEAr USB client controller has the capability to detect when the
+	 * USB cable is connected to a powered USB bus, so we will defer the
+	 * DEVICE_HUB_CONFIGURED and DEVICE_RESET events until later.
+	 */
+
+	udc_enable(device);
+}
+
+/*
+ * Plug detection interrupt handling
+ */
+void spear_udc_plug_irq(void)
+{
+	if (readl(&plug_regs_p->plug_state) & PLUG_STATUS_ATTACHED) {
+		/*
+		 * USB cable attached
+		 * Turn off PHY reset bit (PLUG detect).
+		 * Switch PHY opmode to normal operation (PLUG detect).
+		 */
+		udc_connect();
+		writel(DEV_INT_SOF, &udc_regs_p->dev_int_mask);
+
+		UDCDBG("device attached and powered");
+		udc_state_transition(udc_device->device_state, STATE_POWERED);
+	} else {
+		/*
+		 * USB cable detached
+		 * Reset the PHY and switch the mode.
+		 */
+		udc_disconnect();
+		writel(~0x0, &udc_regs_p->dev_int_mask);
+
+		UDCDBG("device detached or unpowered");
+		udc_state_transition(udc_device->device_state, STATE_ATTACHED);
+	}
+}
+
+/*
+ * Device interrupt handling
+ */
+void spear_udc_dev_irq(void)
+{
+	if (readl(&udc_regs_p->dev_int) & DEV_INT_USBRESET) {
+		writel(~0x0, &udc_regs_p->endp_int_mask);
+
+		udc_connect();
+
+		writel(readl(&inep_regs_p[0].endp_cntl) | ENDP_CNTL_FLUSH,
+		       &inep_regs_p[0].endp_cntl);
+
+		writel(DEV_INT_USBRESET, &udc_regs_p->dev_int);
+
+		UDCDBG("device reset in progess");
+		udc_state_transition(udc_device->device_state, STATE_DEFAULT);
+	}
+
+	/* Device Enumeration completed */
+	if (readl(&udc_regs_p->dev_int) & DEV_INT_ENUM) {
+		writel(DEV_INT_ENUM, &udc_regs_p->dev_int);
+
+		/* Endpoint interrupt enabled for Ctrl IN & Ctrl OUT */
+		writel(readl(&udc_regs_p->endp_int_mask) & ~0x10001,
+		       &udc_regs_p->endp_int_mask);
+
+		UDCDBG("default -> addressed");
+		udc_state_transition(udc_device->device_state, STATE_ADDRESSED);
+	}
+
+	/* The USB will be in SUSPEND in 3 ms */
+	if (readl(&udc_regs_p->dev_int) & DEV_INT_INACTIVE) {
+		writel(DEV_INT_INACTIVE, &udc_regs_p->dev_int);
+
+		UDCDBG("entering inactive state");
+		/* usbd_device_event_irq(udc_device, DEVICE_BUS_INACTIVE, 0); */
+	}
+
+	/* SetConfiguration command received */
+	if (readl(&udc_regs_p->dev_int) & DEV_INT_SETCFG) {
+		writel(DEV_INT_SETCFG, &udc_regs_p->dev_int);
+
+		UDCDBG("entering configured state");
+		udc_state_transition(udc_device->device_state,
+				     STATE_CONFIGURED);
+	}
+
+	/* SetInterface command received */
+	if (readl(&udc_regs_p->dev_int) & DEV_INT_SETINTF)
+		writel(DEV_INT_SETINTF, &udc_regs_p->dev_int);
+
+	/* USB Suspend detected on cable */
+	if (readl(&udc_regs_p->dev_int) & DEV_INT_SUSPUSB) {
+		writel(DEV_INT_SUSPUSB, &udc_regs_p->dev_int);
+
+		UDCDBG("entering suspended state");
+		usbd_device_event_irq(udc_device, DEVICE_BUS_INACTIVE, 0);
+	}
+
+	/* USB Start-Of-Frame detected on cable */
+	if (readl(&udc_regs_p->dev_int) & DEV_INT_SOF)
+		writel(DEV_INT_SOF, &udc_regs_p->dev_int);
+}
+
+/*
+ * Endpoint interrupt handling
+ */
+void spear_udc_endpoint_irq(void)
+{
+	while (readl(&udc_regs_p->endp_int) & ENDP0_INT_CTRLOUT) {
+
+		writel(ENDP0_INT_CTRLOUT, &udc_regs_p->endp_int);
+
+		if ((readl(&outep_regs_p[0].endp_status) & ENDP_STATUS_OUTMSK)
+		    == ENDP_STATUS_OUT_SETUP) {
+			spear_udc_setup(udc_device->bus->endpoint_array + 0);
+			writel(ENDP_STATUS_OUT_SETUP,
+			       &outep_regs_p[0].endp_status);
+
+		} else if ((readl(&outep_regs_p[0].endp_status) &
+			    ENDP_STATUS_OUTMSK) == ENDP_STATUS_OUT_DATA) {
+			spear_udc_ep0_rx(udc_device->bus->endpoint_array + 0);
+			writel(ENDP_STATUS_OUT_DATA,
+			       &outep_regs_p[0].endp_status);
+
+		} else if ((readl(&outep_regs_p[0].endp_status) &
+			    ENDP_STATUS_OUTMSK) == ENDP_STATUS_OUT_NONE) {
+			/* NONE received */
+		}
+
+		writel(0x0, &outep_regs_p[0].endp_status);
+	}
+
+	if (readl(&udc_regs_p->endp_int) & ENDP0_INT_CTRLIN) {
+		spear_udc_ep0_tx(udc_device->bus->endpoint_array + 0);
+
+		writel(ENDP_STATUS_IN, &inep_regs_p[0].endp_status);
+		writel(ENDP0_INT_CTRLIN, &udc_regs_p->endp_int);
+	}
+
+	while (readl(&udc_regs_p->endp_int) & ENDP_INT_NONISOOUT_MSK) {
+		u32 epnum = 0;
+		u32 ep_int = readl(&udc_regs_p->endp_int) &
+		    ENDP_INT_NONISOOUT_MSK;
+
+		ep_int >>= 16;
+		while (0x0 == (ep_int & 0x1)) {
+			ep_int >>= 1;
+			epnum++;
+		}
+
+		writel((1 << 16) << epnum, &udc_regs_p->endp_int);
+
+		if ((readl(&outep_regs_p[epnum].endp_status) &
+		     ENDP_STATUS_OUTMSK) == ENDP_STATUS_OUT_DATA) {
+
+			spear_udc_epn_rx(epnum);
+			writel(ENDP_STATUS_OUT_DATA,
+			       &outep_regs_p[epnum].endp_status);
+		} else if ((readl(&outep_regs_p[epnum].endp_status) &
+			    ENDP_STATUS_OUTMSK) == ENDP_STATUS_OUT_NONE) {
+			writel(0x0, &outep_regs_p[epnum].endp_status);
+		}
+	}
+
+	if (readl(&udc_regs_p->endp_int) & ENDP_INT_NONISOIN_MSK) {
+		u32 epnum = 0;
+		u32 ep_int = readl(&udc_regs_p->endp_int) &
+		    ENDP_INT_NONISOIN_MSK;
+
+		while (0x0 == (ep_int & 0x1)) {
+			ep_int >>= 1;
+			epnum++;
+		}
+
+		if (readl(&inep_regs_p[epnum].endp_status) & ENDP_STATUS_IN) {
+			writel(ENDP_STATUS_IN,
+			       &outep_regs_p[epnum].endp_status);
+			spear_udc_epn_tx(epnum);
+
+			writel(ENDP_STATUS_IN,
+			       &outep_regs_p[epnum].endp_status);
+		}
+
+		writel((1 << epnum), &udc_regs_p->endp_int);
+	}
+}
+
+/*
+ * UDC interrupts
+ */
+void udc_irq(void)
+{
+	/*
+	 * Loop while we have interrupts.
+	 * If we don't do this, the input chain
+	 * polling delay is likely to miss
+	 * host requests.
+	 */
+	while (readl(&plug_regs_p->plug_pending))
+		spear_udc_plug_irq();
+
+	while (readl(&udc_regs_p->dev_int))
+		spear_udc_dev_irq();
+
+	if (readl(&udc_regs_p->endp_int))
+		spear_udc_endpoint_irq();
+}
+
+/* Flow control */
+void udc_set_nak(int epid)
+{
+	writel(readl(&inep_regs_p[epid].endp_cntl) | ENDP_CNTL_SNAK,
+	       &inep_regs_p[epid].endp_cntl);
+
+	writel(readl(&outep_regs_p[epid].endp_cntl) | ENDP_CNTL_SNAK,
+	       &outep_regs_p[epid].endp_cntl);
+}
+
+void udc_unset_nak(int epid)
+{
+	u32 val;
+
+	val = readl(&inep_regs_p[epid].endp_cntl);
+	val &= ~ENDP_CNTL_SNAK;
+	val |= ENDP_CNTL_CNAK;
+	writel(val, &inep_regs_p[epid].endp_cntl);
+
+	val = readl(&outep_regs_p[epid].endp_cntl);
+	val &= ~ENDP_CNTL_SNAK;
+	val |= ENDP_CNTL_CNAK;
+	writel(val, &outep_regs_p[epid].endp_cntl);
+}