add etrax usb driver

SVN-Revision: 11039

4 files changed, 4862 insertions, 7 deletions

diff --git a/target/linux/etrax/config-default b/target/linux/etrax/config-default
index 756a89d..6c6351d 100644
--- a/target/linux/etrax/config-default
+++ b/target/linux/etrax/config-default
@@ -147,9 +147,7 @@ CONFIG_ETRAX_SERIAL_PORT3_DMA5_IN=y
 CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS=1
 # CONFIG_ETRAX_SOFT_SHUTDOWN is not set
 # CONFIG_ETRAX_SYNCHRONOUS_SERIAL is not set
-CONFIG_ETRAX_USB_HOST=y
-CONFIG_ETRAX_USB_HOST_PORT1=y
-CONFIG_ETRAX_USB_HOST_PORT2=y
+# CONFIG_ETRAX_USB_HOST is not set
 # CONFIG_ETRAX_VCS_SIM is not set
 # CONFIG_ETRAX_WATCHDOG is not set
 CONFIG_FAT_FS=y
@@ -247,12 +245,8 @@ CONFIG_SLABINFO=y
 # CONFIG_SYSTEM_PROFILER is not set
 CONFIG_SYSVIPC_SYSCTL=y
 CONFIG_UID16=y
-CONFIG_USB=y
 # CONFIG_USB_ARCH_HAS_EHCI is not set
 # CONFIG_USB_ARCH_HAS_HCD is not set
 # CONFIG_USB_ARCH_HAS_OHCI is not set
-# CONFIG_USB_R8A66597_HCD is not set
-# CONFIG_USB_SERIAL_IR is not set
-CONFIG_USB_ZD1201=y
 CONFIG_VFAT_FS=y
 # CONFIG_VLAN_8021Q is not set
diff --git a/target/linux/etrax/files/drivers/usb/host/hc_crisv10.c b/target/linux/etrax/files/drivers/usb/host/hc_crisv10.c
new file mode 100644
index 0000000..32f7caf
--- /dev/null
+++ b/target/linux/etrax/files/drivers/usb/host/hc_crisv10.c
@@ -0,0 +1,4550 @@
+/*
+ * usb-host.c: ETRAX 100LX USB Host Controller Driver (HCD)
+ *
+ * Copyright (c) 2002, 2003 Axis Communications AB.
+ */
+
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/unistd.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/dma.h>
+#include <asm/system.h>
+#include <asm/arch/svinto.h>
+
+#include <linux/usb.h>
+/* Ugly include because we don't live with the other host drivers. */
+#include <../drivers/usb/core/hcd.h>
+#include <../drivers/usb/core/usb.h>
+
+#include "hc_crisv10.h"
+
+#define ETRAX_USB_HC_IRQ USB_HC_IRQ_NBR
+#define ETRAX_USB_RX_IRQ USB_DMA_RX_IRQ_NBR
+#define ETRAX_USB_TX_IRQ USB_DMA_TX_IRQ_NBR
+
+static const char *usb_hcd_version = "$Revision: 1.2 $";
+
+#undef KERN_DEBUG
+#define KERN_DEBUG ""
+
+
+#undef USB_DEBUG_RH
+#undef USB_DEBUG_EPID
+#undef USB_DEBUG_SB
+#undef USB_DEBUG_DESC
+#undef USB_DEBUG_URB
+#undef USB_DEBUG_TRACE
+#undef USB_DEBUG_BULK
+#undef USB_DEBUG_CTRL
+#undef USB_DEBUG_INTR
+#undef USB_DEBUG_ISOC
+
+#ifdef USB_DEBUG_RH
+#define dbg_rh(format, arg...) printk(KERN_DEBUG __FILE__ ": (RH) " format "\n" , ## arg)
+#else
+#define dbg_rh(format, arg...) do {} while (0)
+#endif
+
+#ifdef USB_DEBUG_EPID
+#define dbg_epid(format, arg...) printk(KERN_DEBUG __FILE__ ": (EPID) " format "\n" , ## arg)
+#else
+#define dbg_epid(format, arg...) do {} while (0)
+#endif
+
+#ifdef USB_DEBUG_SB
+#define dbg_sb(format, arg...) printk(KERN_DEBUG __FILE__ ": (SB) " format "\n" , ## arg)
+#else
+#define dbg_sb(format, arg...) do {} while (0)
+#endif
+
+#ifdef USB_DEBUG_CTRL
+#define dbg_ctrl(format, arg...) printk(KERN_DEBUG __FILE__ ": (CTRL) " format "\n" , ## arg)
+#else
+#define dbg_ctrl(format, arg...) do {} while (0)
+#endif
+
+#ifdef USB_DEBUG_BULK
+#define dbg_bulk(format, arg...) printk(KERN_DEBUG __FILE__ ": (BULK) " format "\n" , ## arg)
+#else
+#define dbg_bulk(format, arg...) do {} while (0)
+#endif
+
+#ifdef USB_DEBUG_INTR
+#define dbg_intr(format, arg...) printk(KERN_DEBUG __FILE__ ": (INTR) " format "\n" , ## arg)
+#else
+#define dbg_intr(format, arg...) do {} while (0)
+#endif
+
+#ifdef USB_DEBUG_ISOC
+#define dbg_isoc(format, arg...) printk(KERN_DEBUG __FILE__ ": (ISOC) " format "\n" , ## arg)
+#else
+#define dbg_isoc(format, arg...) do {} while (0)
+#endif
+
+#ifdef USB_DEBUG_TRACE
+#define DBFENTER (printk(": Entering: %s\n", __FUNCTION__))
+#define DBFEXIT  (printk(": Exiting:  %s\n", __FUNCTION__))
+#else
+#define DBFENTER do {} while (0)
+#define DBFEXIT  do {} while (0)
+#endif
+
+#define usb_pipeslow(pipe)	(((pipe) >> 26) & 1)
+
+/*-------------------------------------------------------------------
+ Virtual Root Hub
+ -------------------------------------------------------------------*/
+
+static __u8 root_hub_dev_des[] =
+{
+	0x12,  /*  __u8  bLength; */
+	0x01,  /*  __u8  bDescriptorType; Device */
+	0x00,  /*  __le16 bcdUSB; v1.0 */
+	0x01,
+	0x09,  /*  __u8  bDeviceClass; HUB_CLASSCODE */
+	0x00,  /*  __u8  bDeviceSubClass; */
+	0x00,  /*  __u8  bDeviceProtocol; */
+	0x08,  /*  __u8  bMaxPacketSize0; 8 Bytes */
+	0x00,  /*  __le16 idVendor; */
+	0x00,
+	0x00,  /*  __le16 idProduct; */
+	0x00,
+	0x00,  /*  __le16 bcdDevice; */
+	0x00,
+	0x00,  /*  __u8  iManufacturer; */
+	0x02,  /*  __u8  iProduct; */
+	0x01,  /*  __u8  iSerialNumber; */
+	0x01   /*  __u8  bNumConfigurations; */
+};
+
+/* Configuration descriptor */
+static __u8 root_hub_config_des[] =
+{
+	0x09,  /*  __u8  bLength; */
+	0x02,  /*  __u8  bDescriptorType; Configuration */
+	0x19,  /*  __le16 wTotalLength; */
+	0x00,
+	0x01,  /*  __u8  bNumInterfaces; */
+	0x01,  /*  __u8  bConfigurationValue; */
+	0x00,  /*  __u8  iConfiguration; */
+	0x40,  /*  __u8  bmAttributes; Bit 7: Bus-powered */
+	0x00,  /*  __u8  MaxPower; */
+
+     /* interface */
+	0x09,  /*  __u8  if_bLength; */
+	0x04,  /*  __u8  if_bDescriptorType; Interface */
+	0x00,  /*  __u8  if_bInterfaceNumber; */
+	0x00,  /*  __u8  if_bAlternateSetting; */
+	0x01,  /*  __u8  if_bNumEndpoints; */
+	0x09,  /*  __u8  if_bInterfaceClass; HUB_CLASSCODE */
+	0x00,  /*  __u8  if_bInterfaceSubClass; */
+	0x00,  /*  __u8  if_bInterfaceProtocol; */
+	0x00,  /*  __u8  if_iInterface; */
+
+     /* endpoint */
+	0x07,  /*  __u8  ep_bLength; */
+	0x05,  /*  __u8  ep_bDescriptorType; Endpoint */
+	0x81,  /*  __u8  ep_bEndpointAddress; IN Endpoint 1 */
+	0x03,  /*  __u8  ep_bmAttributes; Interrupt */
+	0x08,  /*  __le16 ep_wMaxPacketSize; 8 Bytes */
+	0x00,
+	0xff   /*  __u8  ep_bInterval; 255 ms */
+};
+
+static __u8 root_hub_hub_des[] =
+{
+	0x09,  /*  __u8  bLength; */
+	0x29,  /*  __u8  bDescriptorType; Hub-descriptor */
+	0x02,  /*  __u8  bNbrPorts; */
+	0x00,  /* __u16  wHubCharacteristics; */
+	0x00,
+	0x01,  /*  __u8  bPwrOn2pwrGood; 2ms */
+	0x00,  /*  __u8  bHubContrCurrent; 0 mA */
+	0x00,  /*  __u8  DeviceRemovable; *** 7 Ports max *** */
+	0xff   /*  __u8  PortPwrCtrlMask; *** 7 ports max *** */
+};
+
+static DEFINE_TIMER(bulk_start_timer, NULL, 0, 0);
+static DEFINE_TIMER(bulk_eot_timer, NULL, 0, 0);
+
+/* We want the start timer to expire before the eot timer, because the former might start
+   traffic, thus making it unnecessary for the latter to time out. */
+#define BULK_START_TIMER_INTERVAL (HZ/10) /* 100 ms */
+#define BULK_EOT_TIMER_INTERVAL (HZ/10+2) /* 120 ms */
+
+#define OK(x) len = (x); dbg_rh("OK(%d): line: %d", x, __LINE__); break
+#define CHECK_ALIGN(x) if (((__u32)(x)) & 0x00000003) \
+{panic("Alignment check (DWORD) failed at %s:%s:%d\n", __FILE__, __FUNCTION__, __LINE__);}
+
+#define SLAB_FLAG     (in_interrupt() ? GFP_ATOMIC : GFP_KERNEL)
+#define KMALLOC_FLAG  (in_interrupt() ? GFP_ATOMIC : GFP_KERNEL)
+
+/* Most helpful debugging aid */
+#define assert(expr) ((void) ((expr) ? 0 : (err("assert failed at line %d",__LINE__))))
+
+/* Alternative assert define which stops after a failed assert. */
+/*
+#define assert(expr)                                      \
+{                                                         \
+        if (!(expr)) {                                    \
+                err("assert failed at line %d",__LINE__); \
+                while (1);                                \
+        }                                                 \
+}
+*/
+
+
+/* FIXME: Should RX_BUF_SIZE be a config option, or maybe we should adjust it dynamically?
+   To adjust it dynamically we would have to get an interrupt when we reach the end
+   of the rx descriptor list, or when we get close to the end, and then allocate more
+   descriptors. */
+
+#define NBR_OF_RX_DESC     512
+#define RX_DESC_BUF_SIZE   1024
+#define RX_BUF_SIZE        (NBR_OF_RX_DESC * RX_DESC_BUF_SIZE)
+
+/* The number of epids is, among other things, used for pre-allocating
+   ctrl, bulk and isoc EP descriptors (one for each epid).
+   Assumed to be > 1 when initiating the DMA lists. */
+#define NBR_OF_EPIDS       32
+
+/* Support interrupt traffic intervals up to 128 ms. */
+#define MAX_INTR_INTERVAL 128
+
+/* If periodic traffic (intr or isoc) is to be used, then one entry in the EP table
+   must be "invalid". By this we mean that we shouldn't care about epid attentions
+   for this epid, or at least handle them differently from epid attentions for "valid"
+   epids. This define determines which one to use (don't change it). */
+#define INVALID_EPID     31
+/* A special epid for the bulk dummys. */
+#define DUMMY_EPID       30
+
+/* This is just a software cache for the valid entries in R_USB_EPT_DATA. */
+static __u32 epid_usage_bitmask;
+
+/* A bitfield to keep information on in/out traffic is needed to uniquely identify
+   an endpoint on a device, since the most significant bit which indicates traffic
+   direction is lacking in the ep_id field (ETRAX epids can handle both in and
+   out traffic on endpoints that are otherwise identical). The USB framework, however,
+   relies on them to be handled separately.  For example, bulk IN and OUT urbs cannot
+   be queued in the same list, since they would block each other. */
+static __u32 epid_out_traffic;
+
+/* DMA IN cache bug. Align the DMA IN buffers to 32 bytes, i.e. a cache line.
+   Since RX_DESC_BUF_SIZE is 1024 is a multiple of 32, all rx buffers will be cache aligned. */
+static volatile unsigned char RxBuf[RX_BUF_SIZE] __attribute__ ((aligned (32)));
+static volatile USB_IN_Desc_t RxDescList[NBR_OF_RX_DESC] __attribute__ ((aligned (4)));
+
+/* Pointers into RxDescList. */
+static volatile USB_IN_Desc_t *myNextRxDesc;
+static volatile USB_IN_Desc_t *myLastRxDesc;
+static volatile USB_IN_Desc_t *myPrevRxDesc;
+
+/* EP descriptors must be 32-bit aligned. */
+static volatile USB_EP_Desc_t TxCtrlEPList[NBR_OF_EPIDS] __attribute__ ((aligned (4)));
+static volatile USB_EP_Desc_t TxBulkEPList[NBR_OF_EPIDS] __attribute__ ((aligned (4)));
+/* After each enabled bulk EP (IN or OUT) we put two disabled EP descriptors with the eol flag set,
+   causing the DMA to stop the DMA channel. The first of these two has the intr flag set, which
+   gives us a dma8_sub0_descr interrupt. When we receive this, we advance the DMA one step in the
+   EP list and then restart the bulk channel, thus forcing a switch between bulk EP descriptors
+   in each frame. */
+static volatile USB_EP_Desc_t TxBulkDummyEPList[NBR_OF_EPIDS][2] __attribute__ ((aligned (4)));
+
+static volatile USB_EP_Desc_t TxIsocEPList[NBR_OF_EPIDS] __attribute__ ((aligned (4)));
+static volatile USB_SB_Desc_t TxIsocSB_zout __attribute__ ((aligned (4)));
+
+static volatile USB_EP_Desc_t TxIntrEPList[MAX_INTR_INTERVAL] __attribute__ ((aligned (4)));
+static volatile USB_SB_Desc_t TxIntrSB_zout __attribute__ ((aligned (4)));
+
+/* A zout transfer makes a memory access at the address of its buf pointer, which means that setting
+   this buf pointer to 0 will cause an access to the flash. In addition to this, setting sw_len to 0
+   results in a 16/32 bytes (depending on DMA burst size) transfer. Instead, we set it to 1, and point
+   it to this buffer. */
+static int zout_buffer[4] __attribute__ ((aligned (4)));
+
+/* Cache for allocating new EP and SB descriptors. */
+static struct kmem_cache *usb_desc_cache;
+
+/* Cache for the registers allocated in the top half. */
+static struct kmem_cache *top_half_reg_cache;
+
+/* Cache for the data allocated in the isoc descr top half. */
+static struct kmem_cache *isoc_compl_cache;
+
+static struct usb_bus *etrax_usb_bus;
+
+/* This is a circular (double-linked) list of the active urbs for each epid.
+   The head is never removed, and new urbs are linked onto the list as
+   urb_entry_t elements. Don't reference urb_list directly; use the wrapper
+   functions instead. Note that working with these lists might require spinlock
+   protection. */
+static struct list_head urb_list[NBR_OF_EPIDS];
+
+/* Read about the need and usage of this lock in submit_ctrl_urb. */
+static spinlock_t urb_list_lock;
+
+/* Used when unlinking asynchronously. */
+static struct list_head urb_unlink_list;
+
+/* for returning string descriptors in UTF-16LE */
+static int ascii2utf (char *ascii, __u8 *utf, int utfmax)
+{
+	int retval;
+
+	for (retval = 0; *ascii && utfmax > 1; utfmax -= 2, retval += 2) {
+		*utf++ = *ascii++ & 0x7f;
+		*utf++ = 0;
+	}
+	return retval;
+}
+
+static int usb_root_hub_string (int id, int serial, char *type, __u8 *data, int len)
+{
+	char buf [30];
+
+	// assert (len > (2 * (sizeof (buf) + 1)));
+	// assert (strlen (type) <= 8);
+
+	// language ids
+	if (id == 0) {
+		*data++ = 4; *data++ = 3;	/* 4 bytes data */
+		*data++ = 0; *data++ = 0;	/* some language id */
+		return 4;
+
+	// serial number
+	} else if (id == 1) {
+		sprintf (buf, "%x", serial);
+
+	// product description
+	} else if (id == 2) {
+		sprintf (buf, "USB %s Root Hub", type);
+
+	// id 3 == vendor description
+
+	// unsupported IDs --> "stall"
+	} else
+	    return 0;
+
+	data [0] = 2 + ascii2utf (buf, data + 2, len - 2);
+	data [1] = 3;
+	return data [0];
+}
+
+/* Wrappers around the list functions (include/linux/list.h). */
+
+static inline int urb_list_empty(int epid)
+{
+	return list_empty(&urb_list[epid]);
+}
+
+/* Returns first urb for this epid, or NULL if list is empty. */
+static inline struct urb *urb_list_first(int epid)
+{
+	struct urb *first_urb = 0;
+
+	if (!urb_list_empty(epid)) {
+		/* Get the first urb (i.e. head->next). */
+		urb_entry_t *urb_entry = list_entry((&urb_list[epid])->next, urb_entry_t, list);
+		first_urb = urb_entry->urb;
+	}
+	return first_urb;
+}
+
+/* Adds an urb_entry last in the list for this epid. */
+static inline void urb_list_add(struct urb *urb, int epid)
+{
+	urb_entry_t *urb_entry = kmalloc(sizeof(urb_entry_t), KMALLOC_FLAG);
+	assert(urb_entry);
+
+	urb_entry->urb = urb;
+	list_add_tail(&urb_entry->list, &urb_list[epid]);
+}
+
+/* Search through the list for an element that contains this urb. (The list
+   is expected to be short and the one we are about to delete will often be
+   the first in the list.) */
+static inline urb_entry_t *__urb_list_entry(struct urb *urb, int epid)
+{
+	struct list_head *entry;
+	struct list_head *tmp;
+	urb_entry_t *urb_entry;
+
+	list_for_each_safe(entry, tmp, &urb_list[epid]) {
+		urb_entry = list_entry(entry, urb_entry_t, list);
+		assert(urb_entry);
+		assert(urb_entry->urb);
+
+		if (urb_entry->urb == urb) {
+			return urb_entry;
+		}
+	}
+	return 0;
+}
+
+/* Delete an urb from the list. */
+static inline void urb_list_del(struct urb *urb, int epid)
+{
+	urb_entry_t *urb_entry = __urb_list_entry(urb, epid);
+	assert(urb_entry);
+
+	/* Delete entry and free. */
+	list_del(&urb_entry->list);
+	kfree(urb_entry);
+}
+
+/* Move an urb to the end of the list. */
+static inline void urb_list_move_last(struct urb *urb, int epid)
+{
+	urb_entry_t *urb_entry = __urb_list_entry(urb, epid);
+	assert(urb_entry);
+
+	list_move_tail(&urb_entry->list, &urb_list[epid]);
+}
+
+/* Get the next urb in the list. */
+static inline struct urb *urb_list_next(struct urb *urb, int epid)
+{
+	urb_entry_t *urb_entry = __urb_list_entry(urb, epid);
+
+	assert(urb_entry);
+
+	if (urb_entry->list.next != &urb_list[epid]) {
+		struct list_head *elem = urb_entry->list.next;
+		urb_entry = list_entry(elem, urb_entry_t, list);
+		return urb_entry->urb;
+	} else {
+		return NULL;
+	}
+}
+
+
+
+/* For debug purposes only. */
+static inline void urb_list_dump(int epid)
+{
+	struct list_head *entry;
+	struct list_head *tmp;
+	urb_entry_t *urb_entry;
+	int i = 0;
+
+	info("Dumping urb list for epid %d", epid);
+
+	list_for_each_safe(entry, tmp, &urb_list[epid]) {
+		urb_entry = list_entry(entry, urb_entry_t, list);
+		info("   entry %d, urb = 0x%lx", i, (unsigned long)urb_entry->urb);
+	}
+}
+
+static void init_rx_buffers(void);
+static int etrax_rh_unlink_urb(struct urb *urb);
+static void etrax_rh_send_irq(struct urb *urb);
+static void etrax_rh_init_int_timer(struct urb *urb);
+static void etrax_rh_int_timer_do(unsigned long ptr);
+
+static int etrax_usb_setup_epid(struct urb *urb);
+static int etrax_usb_lookup_epid(struct urb *urb);
+static int etrax_usb_allocate_epid(void);
+static void etrax_usb_free_epid(int epid);
+
+static int etrax_remove_from_sb_list(struct urb *urb);
+
+static void* etrax_usb_buffer_alloc(struct usb_bus* bus, size_t size,
+	unsigned mem_flags, dma_addr_t *dma);
+static void etrax_usb_buffer_free(struct usb_bus *bus, size_t size, void *addr, dma_addr_t dma);
+
+static void etrax_usb_add_to_bulk_sb_list(struct urb *urb, int epid);
+static void etrax_usb_add_to_ctrl_sb_list(struct urb *urb, int epid);
+static void etrax_usb_add_to_intr_sb_list(struct urb *urb, int epid);
+static void etrax_usb_add_to_isoc_sb_list(struct urb *urb, int epid);
+
+static int etrax_usb_submit_bulk_urb(struct urb *urb);
+static int etrax_usb_submit_ctrl_urb(struct urb *urb);
+static int etrax_usb_submit_intr_urb(struct urb *urb);
+static int etrax_usb_submit_isoc_urb(struct urb *urb);
+
+static int etrax_usb_submit_urb(struct urb *urb, unsigned mem_flags);
+static int etrax_usb_unlink_urb(struct urb *urb, int status);
+static int etrax_usb_get_frame_number(struct usb_device *usb_dev);
+
+static irqreturn_t etrax_usb_tx_interrupt(int irq, void *vhc);
+static irqreturn_t etrax_usb_rx_interrupt(int irq, void *vhc);
+static irqreturn_t etrax_usb_hc_interrupt_top_half(int irq, void *vhc);
+static void etrax_usb_hc_interrupt_bottom_half(void *data);
+
+static void etrax_usb_isoc_descr_interrupt_bottom_half(void *data);
+
+
+/* The following is a list of interrupt handlers for the host controller interrupts we use.
+   They are called from etrax_usb_hc_interrupt_bottom_half. */
+static void etrax_usb_hc_isoc_eof_interrupt(void);
+static void etrax_usb_hc_bulk_eot_interrupt(int timer_induced);
+static void etrax_usb_hc_epid_attn_interrupt(usb_interrupt_registers_t *reg);
+static void etrax_usb_hc_port_status_interrupt(usb_interrupt_registers_t *reg);
+static void etrax_usb_hc_ctl_status_interrupt(usb_interrupt_registers_t *reg);
+
+static int etrax_rh_submit_urb (struct urb *urb);
+
+/* Forward declaration needed because they are used in the rx interrupt routine. */
+static void etrax_usb_complete_urb(struct urb *urb, int status);
+static void etrax_usb_complete_bulk_urb(struct urb *urb, int status);
+static void etrax_usb_complete_ctrl_urb(struct urb *urb, int status);
+static void etrax_usb_complete_intr_urb(struct urb *urb, int status);
+static void etrax_usb_complete_isoc_urb(struct urb *urb, int status);
+
+static int etrax_usb_hc_init(void);
+static void etrax_usb_hc_cleanup(void);
+
+static struct usb_operations etrax_usb_device_operations =
+{
+	.get_frame_number = etrax_usb_get_frame_number,
+	.submit_urb = etrax_usb_submit_urb,
+	.unlink_urb = etrax_usb_unlink_urb,
+        .buffer_alloc = etrax_usb_buffer_alloc,
+        .buffer_free = etrax_usb_buffer_free
+};
+
+/* Note that these functions are always available in their "__" variants, for use in
+   error situations. The "__" missing variants are controlled by the USB_DEBUG_DESC/
+   USB_DEBUG_URB macros. */
+static void __dump_urb(struct urb* purb)
+{
+	printk("\nurb                  :0x%08lx\n", (unsigned long)purb);
+	printk("dev                   :0x%08lx\n", (unsigned long)purb->dev);
+	printk("pipe                  :0x%08x\n", purb->pipe);
+	printk("status                :%d\n", purb->status);
+	printk("transfer_flags        :0x%08x\n", purb->transfer_flags);
+	printk("transfer_buffer       :0x%08lx\n", (unsigned long)purb->transfer_buffer);
+	printk("transfer_buffer_length:%d\n", purb->transfer_buffer_length);
+	printk("actual_length         :%d\n", purb->actual_length);
+	printk("setup_packet          :0x%08lx\n", (unsigned long)purb->setup_packet);
+	printk("start_frame           :%d\n", purb->start_frame);
+	printk("number_of_packets     :%d\n", purb->number_of_packets);
+	printk("interval              :%d\n", purb->interval);
+	printk("error_count           :%d\n", purb->error_count);
+	printk("context               :0x%08lx\n", (unsigned long)purb->context);
+	printk("complete              :0x%08lx\n\n", (unsigned long)purb->complete);
+}
+
+static void __dump_in_desc(volatile USB_IN_Desc_t *in)
+{
+	printk("\nUSB_IN_Desc at 0x%08lx\n", (unsigned long)in);
+	printk("  sw_len  : 0x%04x (%d)\n", in->sw_len, in->sw_len);
+	printk("  command : 0x%04x\n", in->command);
+	printk("  next    : 0x%08lx\n", in->next);
+	printk("  buf     : 0x%08lx\n", in->buf);
+	printk("  hw_len  : 0x%04x (%d)\n", in->hw_len, in->hw_len);
+	printk("  status  : 0x%04x\n\n", in->status);
+}
+
+static void __dump_sb_desc(volatile USB_SB_Desc_t *sb)
+{
+	char tt = (sb->command & 0x30) >> 4;
+	char *tt_string;
+
+	switch (tt) {
+	case 0:
+		tt_string = "zout";
+		break;
+	case 1:
+		tt_string = "in";
+		break;
+	case 2:
+		tt_string = "out";
+		break;
+	case 3:
+		tt_string = "setup";
+		break;
+	default:
+		tt_string = "unknown (weird)";
+	}
+
+	printk("\n   USB_SB_Desc at 0x%08lx\n", (unsigned long)sb);
+	printk("     command : 0x%04x\n", sb->command);
+	printk("        rem     : %d\n", (sb->command & 0x3f00) >> 8);
+	printk("        full    : %d\n", (sb->command & 0x40) >> 6);
+	printk("        tt      : %d (%s)\n", tt, tt_string);
+	printk("        intr    : %d\n", (sb->command & 0x8) >> 3);
+	printk("        eot     : %d\n", (sb->command & 0x2) >> 1);
+	printk("        eol     : %d\n", sb->command & 0x1);
+	printk("     sw_len  : 0x%04x (%d)\n", sb->sw_len, sb->sw_len);
+	printk("     next    : 0x%08lx\n", sb->next);
+	printk("     buf     : 0x%08lx\n\n", sb->buf);
+}
+
+
+static void __dump_ep_desc(volatile USB_EP_Desc_t *ep)
+{
+	printk("\nUSB_EP_Desc at 0x%08lx\n", (unsigned long)ep);
+	printk("  command : 0x%04x\n", ep->command);
+	printk("     ep_id   : %d\n", (ep->command & 0x1f00) >> 8);
+	printk("     enable  : %d\n", (ep->command & 0x10) >> 4);
+	printk("     intr    : %d\n", (ep->command & 0x8) >> 3);
+	printk("     eof     : %d\n", (ep->command & 0x2) >> 1);
+	printk("     eol     : %d\n", ep->command & 0x1);
+	printk("  hw_len  : 0x%04x (%d)\n", ep->hw_len, ep->hw_len);
+	printk("  next    : 0x%08lx\n", ep->next);
+	printk("  sub     : 0x%08lx\n\n", ep->sub);
+}
+
+static inline void __dump_ep_list(int pipe_type)
+{
+	volatile USB_EP_Desc_t *ep;
+	volatile USB_EP_Desc_t *first_ep;
+	volatile USB_SB_Desc_t *sb;
+
+	switch (pipe_type)
+	{
+	case PIPE_BULK:
+		first_ep = &TxBulkEPList[0];
+		break;
+	case PIPE_CONTROL:
+		first_ep = &TxCtrlEPList[0];
+		break;
+	case PIPE_INTERRUPT:
+		first_ep = &TxIntrEPList[0];
+		break;
+	case PIPE_ISOCHRONOUS:
+		first_ep = &TxIsocEPList[0];
+		break;
+	default:
+		warn("Cannot dump unknown traffic type");
+		return;
+	}
+	ep = first_ep;
+
+	printk("\n\nDumping EP list...\n\n");
+
+	do {
+		__dump_ep_desc(ep);
+		/* Cannot phys_to_virt on 0 as it turns into 80000000, which is != 0. */
+		sb = ep->sub ? phys_to_virt(ep->sub) : 0;
+		while (sb) {
+			__dump_sb_desc(sb);
+			sb = sb->next ? phys_to_virt(sb->next) : 0;
+		}
+		ep = (volatile USB_EP_Desc_t *)(phys_to_virt(ep->next));
+
+	} while (ep != first_ep);
+}
+
+static inline void __dump_ept_data(int epid)
+{
+	unsigned long flags;
+	__u32 r_usb_ept_data;
+
+	if (epid < 0 || epid > 31) {
+		printk("Cannot dump ept data for invalid epid %d\n", epid);
+		return;
+	}
+
+	save_flags(flags);
+	cli();
+	*R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
+	nop();
+	r_usb_ept_data = *R_USB_EPT_DATA;
+	restore_flags(flags);
+
+	printk("\nR_USB_EPT_DATA = 0x%x for epid %d :\n", r_usb_ept_data, epid);
+	if (r_usb_ept_data == 0) {
+		/* No need for more detailed printing. */
+		return;
+	}
+	printk("  valid           : %d\n", (r_usb_ept_data & 0x80000000) >> 31);
+	printk("  hold            : %d\n", (r_usb_ept_data & 0x40000000) >> 30);
+	printk("  error_count_in  : %d\n", (r_usb_ept_data & 0x30000000) >> 28);
+	printk("  t_in            : %d\n", (r_usb_ept_data & 0x08000000) >> 27);
+	printk("  low_speed       : %d\n", (r_usb_ept_data & 0x04000000) >> 26);
+	printk("  port            : %d\n", (r_usb_ept_data & 0x03000000) >> 24);
+	printk("  error_code      : %d\n", (r_usb_ept_data & 0x00c00000) >> 22);
+	printk("  t_out           : %d\n", (r_usb_ept_data & 0x00200000) >> 21);
+	printk("  error_count_out : %d\n", (r_usb_ept_data & 0x00180000) >> 19);
+	printk("  max_len         : %d\n", (r_usb_ept_data & 0x0003f800) >> 11);
+	printk("  ep              : %d\n", (r_usb_ept_data & 0x00000780) >> 7);
+	printk("  dev             : %d\n", (r_usb_ept_data & 0x0000003f));
+}
+
+static inline void __dump_ept_data_list(void)
+{
+	int i;
+
+	printk("Dumping the whole R_USB_EPT_DATA list\n");
+
+	for (i = 0; i < 32; i++) {
+		__dump_ept_data(i);
+	}
+}
+#ifdef USB_DEBUG_DESC
+#define dump_in_desc(...) __dump_in_desc(...)
+#define dump_sb_desc(...) __dump_sb_desc(...)
+#define dump_ep_desc(...) __dump_ep_desc(...)
+#else
+#define dump_in_desc(...) do {} while (0)
+#define dump_sb_desc(...) do {} while (0)
+#define dump_ep_desc(...) do {} while (0)
+#endif
+
+#ifdef USB_DEBUG_URB
+#define dump_urb(x)     __dump_urb(x)
+#else
+#define dump_urb(x)     do {} while (0)
+#endif
+
+static void init_rx_buffers(void)
+{
+	int i;
+
+	DBFENTER;
+
+	for (i = 0; i < (NBR_OF_RX_DESC - 1); i++) {
+		RxDescList[i].sw_len = RX_DESC_BUF_SIZE;
+		RxDescList[i].command = 0;
+		RxDescList[i].next = virt_to_phys(&RxDescList[i + 1]);
+		RxDescList[i].buf = virt_to_phys(RxBuf + (i * RX_DESC_BUF_SIZE));
+		RxDescList[i].hw_len = 0;
+		RxDescList[i].status = 0;
+
+		/* DMA IN cache bug. (struct etrax_dma_descr has the same layout as USB_IN_Desc
+		   for the relevant fields.) */
+		prepare_rx_descriptor((struct etrax_dma_descr*)&RxDescList[i]);
+
+	}
+
+	RxDescList[i].sw_len = RX_DESC_BUF_SIZE;
+	RxDescList[i].command = IO_STATE(USB_IN_command, eol, yes);
+	RxDescList[i].next = virt_to_phys(&RxDescList[0]);
+	RxDescList[i].buf = virt_to_phys(RxBuf + (i * RX_DESC_BUF_SIZE));
+	RxDescList[i].hw_len = 0;
+	RxDescList[i].status = 0;
+
+	myNextRxDesc = &RxDescList[0];
+	myLastRxDesc = &RxDescList[NBR_OF_RX_DESC - 1];
+	myPrevRxDesc = &RxDescList[NBR_OF_RX_DESC - 1];
+
+	*R_DMA_CH9_FIRST = virt_to_phys(myNextRxDesc);
+	*R_DMA_CH9_CMD = IO_STATE(R_DMA_CH9_CMD, cmd, start);
+
+	DBFEXIT;
+}
+
+static void init_tx_bulk_ep(void)
+{
+	int i;
+
+	DBFENTER;
+
+	for (i = 0; i < (NBR_OF_EPIDS - 1); i++) {
+		CHECK_ALIGN(&TxBulkEPList[i]);
+		TxBulkEPList[i].hw_len = 0;
+		TxBulkEPList[i].command = IO_FIELD(USB_EP_command, epid, i);
+		TxBulkEPList[i].sub = 0;
+		TxBulkEPList[i].next = virt_to_phys(&TxBulkEPList[i + 1]);
+
+		/* Initiate two EPs, disabled and with the eol flag set. No need for any
+		   preserved epid. */
+
+		/* The first one has the intr flag set so we get an interrupt when the DMA
+		   channel is about to become disabled. */
+		CHECK_ALIGN(&TxBulkDummyEPList[i][0]);
+		TxBulkDummyEPList[i][0].hw_len = 0;
+		TxBulkDummyEPList[i][0].command = (IO_FIELD(USB_EP_command, epid, DUMMY_EPID) |
+						   IO_STATE(USB_EP_command, eol, yes) |
+						   IO_STATE(USB_EP_command, intr, yes));
+		TxBulkDummyEPList[i][0].sub = 0;
+		TxBulkDummyEPList[i][0].next = virt_to_phys(&TxBulkDummyEPList[i][1]);
+
+		/* The second one. */
+		CHECK_ALIGN(&TxBulkDummyEPList[i][1]);
+		TxBulkDummyEPList[i][1].hw_len = 0;
+		TxBulkDummyEPList[i][1].command = (IO_FIELD(USB_EP_command, epid, DUMMY_EPID) |
+						   IO_STATE(USB_EP_command, eol, yes));
+		TxBulkDummyEPList[i][1].sub = 0;
+		/* The last dummy's next pointer is the same as the current EP's next pointer. */
+		TxBulkDummyEPList[i][1].next = virt_to_phys(&TxBulkEPList[i + 1]);
+	}
+
+	/* Configure the last one. */
+	CHECK_ALIGN(&TxBulkEPList[i]);
+	TxBulkEPList[i].hw_len = 0;
+	TxBulkEPList[i].command = (IO_STATE(USB_EP_command, eol, yes) |
+				   IO_FIELD(USB_EP_command, epid, i));
+	TxBulkEPList[i].sub = 0;
+	TxBulkEPList[i].next = virt_to_phys(&TxBulkEPList[0]);
+
+	/* No need configuring dummy EPs for the last one as it will never be used for
+	   bulk traffic (i == INVALD_EPID at this point). */
+
+	/* Set up to start on the last EP so we will enable it when inserting traffic
+	   for the first time (imitating the situation where the DMA has stopped
+	   because there was no more traffic). */
+	*R_DMA_CH8_SUB0_EP = virt_to_phys(&TxBulkEPList[i]);
+	/* No point in starting the bulk channel yet.
+	 *R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start); */
+	DBFEXIT;
+}
+
+static void init_tx_ctrl_ep(void)
+{
+	int i;
+
+	DBFENTER;
+
+	for (i = 0; i < (NBR_OF_EPIDS - 1); i++) {
+		CHECK_ALIGN(&TxCtrlEPList[i]);
+		TxCtrlEPList[i].hw_len = 0;
+		TxCtrlEPList[i].command = IO_FIELD(USB_EP_command, epid, i);
+		TxCtrlEPList[i].sub = 0;
+		TxCtrlEPList[i].next = virt_to_phys(&TxCtrlEPList[i + 1]);
+	}
+
+	CHECK_ALIGN(&TxCtrlEPList[i]);
+	TxCtrlEPList[i].hw_len = 0;
+	TxCtrlEPList[i].command = (IO_STATE(USB_EP_command, eol, yes) |
+				   IO_FIELD(USB_EP_command, epid, i));
+
+	TxCtrlEPList[i].sub = 0;
+	TxCtrlEPList[i].next = virt_to_phys(&TxCtrlEPList[0]);
+
+	*R_DMA_CH8_SUB1_EP = virt_to_phys(&TxCtrlEPList[0]);
+	*R_DMA_CH8_SUB1_CMD = IO_STATE(R_DMA_CH8_SUB1_CMD, cmd, start);
+
+	DBFEXIT;
+}
+
+
+static void init_tx_intr_ep(void)
+{
+	int i;
+
+	DBFENTER;
+
+	/* Read comment at zout_buffer declaration for an explanation to this. */
+	TxIntrSB_zout.sw_len = 1;
+	TxIntrSB_zout.next = 0;
+	TxIntrSB_zout.buf = virt_to_phys(&zout_buffer[0]);
+	TxIntrSB_zout.command = (IO_FIELD(USB_SB_command, rem, 0) |
+				 IO_STATE(USB_SB_command, tt, zout) |
+				 IO_STATE(USB_SB_command, full, yes) |
+				 IO_STATE(USB_SB_command, eot, yes) |
+				 IO_STATE(USB_SB_command, eol, yes));
+
+	for (i = 0; i < (MAX_INTR_INTERVAL - 1); i++) {
+		CHECK_ALIGN(&TxIntrEPList[i]);
+		TxIntrEPList[i].hw_len = 0;
+		TxIntrEPList[i].command =
+			(IO_STATE(USB_EP_command, eof, yes) |
+			 IO_STATE(USB_EP_command, enable, yes) |
+			 IO_FIELD(USB_EP_command, epid, INVALID_EPID));
+		TxIntrEPList[i].sub = virt_to_phys(&TxIntrSB_zout);
+		TxIntrEPList[i].next = virt_to_phys(&TxIntrEPList[i + 1]);
+	}
+
+	CHECK_ALIGN(&TxIntrEPList[i]);
+	TxIntrEPList[i].hw_len = 0;
+	TxIntrEPList[i].command =
+		(IO_STATE(USB_EP_command, eof, yes) |
+		 IO_STATE(USB_EP_command, eol, yes) |
+		 IO_STATE(USB_EP_command, enable, yes) |
+		 IO_FIELD(USB_EP_command, epid, INVALID_EPID));
+	TxIntrEPList[i].sub = virt_to_phys(&TxIntrSB_zout);
+	TxIntrEPList[i].next = virt_to_phys(&TxIntrEPList[0]);
+
+	*R_DMA_CH8_SUB2_EP = virt_to_phys(&TxIntrEPList[0]);
+	*R_DMA_CH8_SUB2_CMD = IO_STATE(R_DMA_CH8_SUB2_CMD, cmd, start);
+	DBFEXIT;
+}
+
+static void init_tx_isoc_ep(void)
+{
+	int i;
+
+	DBFENTER;
+
+	/* Read comment at zout_buffer declaration for an explanation to this. */
+	TxIsocSB_zout.sw_len = 1;
+	TxIsocSB_zout.next = 0;
+	TxIsocSB_zout.buf = virt_to_phys(&zout_buffer[0]);
+	TxIsocSB_zout.command = (IO_FIELD(USB_SB_command, rem, 0) |
+				 IO_STATE(USB_SB_command, tt, zout) |
+				 IO_STATE(USB_SB_command, full, yes) |
+				 IO_STATE(USB_SB_command, eot, yes) |
+				 IO_STATE(USB_SB_command, eol, yes));
+
+	/* The last isochronous EP descriptor is a dummy. */
+
+	for (i = 0; i < (NBR_OF_EPIDS - 1); i++) {
+		CHECK_ALIGN(&TxIsocEPList[i]);
+		TxIsocEPList[i].hw_len = 0;
+		TxIsocEPList[i].command = IO_FIELD(USB_EP_command, epid, i);
+		TxIsocEPList[i].sub = 0;
+		TxIsocEPList[i].next = virt_to_phys(&TxIsocEPList[i + 1]);
+	}
+
+	CHECK_ALIGN(&TxIsocEPList[i]);
+	TxIsocEPList[i].hw_len = 0;
+
+	/* Must enable the last EP descr to get eof interrupt. */
+	TxIsocEPList[i].command = (IO_STATE(USB_EP_command, enable, yes) |
+				   IO_STATE(USB_EP_command, eof, yes) |
+				   IO_STATE(USB_EP_command, eol, yes) |
+				   IO_FIELD(USB_EP_command, epid, INVALID_EPID));
+	TxIsocEPList[i].sub = virt_to_phys(&TxIsocSB_zout);
+	TxIsocEPList[i].next = virt_to_phys(&TxIsocEPList[0]);
+
+	*R_DMA_CH8_SUB3_EP = virt_to_phys(&TxIsocEPList[0]);
+	*R_DMA_CH8_SUB3_CMD = IO_STATE(R_DMA_CH8_SUB3_CMD, cmd, start);
+
+	DBFEXIT;
+}
+
+static void etrax_usb_unlink_intr_urb(struct urb *urb)
+{
+	volatile USB_EP_Desc_t *first_ep;  /* First EP in the list. */
+	volatile USB_EP_Desc_t *curr_ep;   /* Current EP, the iterator. */
+	volatile USB_EP_Desc_t *next_ep;   /* The EP after current. */
+	volatile USB_EP_Desc_t *unlink_ep; /* The one we should remove from the list. */
+
+	int epid;
+
+	/* Read 8.8.4 in Designer's Reference, "Removing an EP Descriptor from the List". */
+
+	DBFENTER;
+
+	epid = ((etrax_urb_priv_t *)urb->hcpriv)->epid;
+
+	first_ep = &TxIntrEPList[0];
+	curr_ep = first_ep;
+
+
+	/* Note that this loop removes all EP descriptors with this epid. This assumes
+	   that all EP descriptors belong to the one and only urb for this epid. */
+
+	do {
+		next_ep = (USB_EP_Desc_t *)phys_to_virt(curr_ep->next);
+
+		if (IO_EXTRACT(USB_EP_command, epid, next_ep->command) == epid) {
+
+			dbg_intr("Found EP to unlink for epid %d", epid);
+
+			/* This is the one we should unlink. */
+			unlink_ep = next_ep;
+
+			/* Actually unlink the EP from the DMA list. */
+			curr_ep->next = unlink_ep->next;
+
+			/* Wait until the DMA is no longer at this descriptor. */
+			while (*R_DMA_CH8_SUB2_EP == virt_to_phys(unlink_ep));
+
+			/* Now we are free to remove it and its SB descriptor.
+			   Note that it is assumed here that there is only one sb in the
+			   sb list for this ep. */
+			kmem_cache_free(usb_desc_cache, phys_to_virt(unlink_ep->sub));
+			kmem_cache_free(usb_desc_cache, (USB_EP_Desc_t *)unlink_ep);
+		}
+
+		curr_ep = phys_to_virt(curr_ep->next);
+
+	} while (curr_ep != first_ep);
+        urb->hcpriv = NULL;
+}
+
+void etrax_usb_do_intr_recover(int epid)
+{
+	USB_EP_Desc_t *first_ep, *tmp_ep;
+
+	DBFENTER;
+
+	first_ep = (USB_EP_Desc_t *)phys_to_virt(*R_DMA_CH8_SUB2_EP);
+	tmp_ep = first_ep;
+
+	/* What this does is simply to walk the list of interrupt
+	   ep descriptors and enable those that are disabled. */
+
+	do {
+		if (IO_EXTRACT(USB_EP_command, epid, tmp_ep->command) == epid &&
+		    !(tmp_ep->command & IO_MASK(USB_EP_command, enable))) {
+			tmp_ep->command |= IO_STATE(USB_EP_command, enable, yes);
+		}
+
+		tmp_ep = (USB_EP_Desc_t *)phys_to_virt(tmp_ep->next);
+
+	} while (tmp_ep != first_ep);
+
+
+	DBFEXIT;
+}
+
+static int etrax_rh_unlink_urb (struct urb *urb)
+{
+	etrax_hc_t *hc;
+
+	DBFENTER;
+
+	hc = urb->dev->bus->hcpriv;
+
+	if (hc->rh.urb == urb) {
+		hc->rh.send = 0;
+		del_timer(&hc->rh.rh_int_timer);
+	}
+
+	DBFEXIT;
+	return 0;
+}
+
+static void etrax_rh_send_irq(struct urb *urb)
+{
+	__u16 data = 0;
+	etrax_hc_t *hc = urb->dev->bus->hcpriv;
+	DBFENTER;
+
+/*
+  dbg_rh("R_USB_FM_NUMBER   : 0x%08X", *R_USB_FM_NUMBER);
+  dbg_rh("R_USB_FM_REMAINING: 0x%08X", *R_USB_FM_REMAINING);
+*/
+
+	data |= (hc->rh.wPortChange_1) ? (1 << 1) : 0;
+	data |= (hc->rh.wPortChange_2) ? (1 << 2) : 0;
+
+	*((__u16 *)urb->transfer_buffer) = cpu_to_le16(data);
+	/* FIXME: Why is actual_length set to 1 when data is 2 bytes?
+	   Since only 1 byte is used, why not declare data as __u8? */
+	urb->actual_length = 1;
+	urb->status = 0;
+
+	if (hc->rh.send && urb->complete) {
+		dbg_rh("wPortChange_1: 0x%04X", hc->rh.wPortChange_1);
+		dbg_rh("wPortChange_2: 0x%04X", hc->rh.wPortChange_2);
+
+		urb->complete(urb, NULL);
+	}
+
+	DBFEXIT;
+}
+
+static void etrax_rh_init_int_timer(struct urb *urb)
+{
+	etrax_hc_t *hc;
+
+	DBFENTER;
+
+	hc = urb->dev->bus->hcpriv;
+	hc->rh.interval = urb->interval;
+	init_timer(&hc->rh.rh_int_timer);
+	hc->rh.rh_int_timer.function = etrax_rh_int_timer_do;
+	hc->rh.rh_int_timer.data = (unsigned long)urb;
+	/* FIXME: Is the jiffies resolution enough? All intervals < 10 ms will be mapped
+	   to 0, and the rest to the nearest lower 10 ms. */
+	hc->rh.rh_int_timer.expires = jiffies + ((HZ * hc->rh.interval) / 1000);
+	add_timer(&hc->rh.rh_int_timer);
+
+	DBFEXIT;
+}
+
+static void etrax_rh_int_timer_do(unsigned long ptr)
+{
+	struct urb *urb;
+	etrax_hc_t *hc;
+
+	DBFENTER;
+
+	urb = (struct urb*)ptr;
+	hc = urb->dev->bus->hcpriv;
+
+	if (hc->rh.send) {
+		etrax_rh_send_irq(urb);
+	}
+
+	DBFEXIT;
+}
+
+static int etrax_usb_setup_epid(struct urb *urb)
+{
+	int epid;
+	char devnum, endpoint, out_traffic, slow;
+	int maxlen;
+	unsigned long flags;
+
+	DBFENTER;
+
+	epid = etrax_usb_lookup_epid(urb);
+	if ((epid != -1)){
+		/* An epid that fits this urb has been found. */
+		DBFEXIT;
+		return epid;
+	}
+
+	/* We must find and initiate a new epid for this urb. */
+	epid = etrax_usb_allocate_epid();
+
+	if (epid == -1) {
+		/* Failed to allocate a new epid. */
+		DBFEXIT;
+		return epid;
+	}
+
+	/* We now have a new epid to use. Initiate it. */
+	set_bit(epid, (void *)&epid_usage_bitmask);
+
+	devnum = usb_pipedevice(urb->pipe);
+	endpoint = usb_pipeendpoint(urb->pipe);
+	slow = usb_pipeslow(urb->pipe);
+	maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
+	if (usb_pipetype(urb->pipe) == PIPE_CONTROL) {
+		/* We want both IN and OUT control traffic to be put on the same EP/SB list. */
+		out_traffic = 1;
+	} else {
+		out_traffic = usb_pipeout(urb->pipe);
+	}
+
+	save_flags(flags);
+	cli();
+
+	*R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
+	nop();
+
+	if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
+		*R_USB_EPT_DATA_ISO = IO_STATE(R_USB_EPT_DATA_ISO, valid, yes) |
+			/* FIXME: Change any to the actual port? */
+			IO_STATE(R_USB_EPT_DATA_ISO, port, any) |
+			IO_FIELD(R_USB_EPT_DATA_ISO, max_len, maxlen) |
+			IO_FIELD(R_USB_EPT_DATA_ISO, ep, endpoint) |
+			IO_FIELD(R_USB_EPT_DATA_ISO, dev, devnum);
+	} else {
+		*R_USB_EPT_DATA = IO_STATE(R_USB_EPT_DATA, valid, yes) |
+			IO_FIELD(R_USB_EPT_DATA, low_speed, slow) |
+			/* FIXME: Change any to the actual port? */
+			IO_STATE(R_USB_EPT_DATA, port, any) |
+			IO_FIELD(R_USB_EPT_DATA, max_len, maxlen) |
+			IO_FIELD(R_USB_EPT_DATA, ep, endpoint) |
+			IO_FIELD(R_USB_EPT_DATA, dev, devnum);
+	}
+
+	restore_flags(flags);
+
+	if (out_traffic) {
+		set_bit(epid, (void *)&epid_out_traffic);
+	} else {
+		clear_bit(epid, (void *)&epid_out_traffic);
+	}
+
+	dbg_epid("Setting up epid %d with devnum %d, endpoint %d and max_len %d (%s)",
+		 epid, devnum, endpoint, maxlen, out_traffic ? "OUT" : "IN");
+
+	DBFEXIT;
+	return epid;
+}
+
+static void etrax_usb_free_epid(int epid)
+{
+	unsigned long flags;
+
+	DBFENTER;
+
+	if (!test_bit(epid, (void *)&epid_usage_bitmask)) {
+		warn("Trying to free unused epid %d", epid);
+		DBFEXIT;
+		return;
+	}
+
+	save_flags(flags);
+	cli();
+
+	*R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
+	nop();
+	while (*R_USB_EPT_DATA & IO_MASK(R_USB_EPT_DATA, hold));
+	/* This will, among other things, set the valid field to 0. */
+	*R_USB_EPT_DATA = 0;
+	restore_flags(flags);
+
+	clear_bit(epid, (void *)&epid_usage_bitmask);
+
+
+	dbg_epid("Freed epid %d", epid);
+
+	DBFEXIT;
+}
+
+static int etrax_usb_lookup_epid(struct urb *urb)
+{
+	int i;
+	__u32 data;
+	char devnum, endpoint, slow, out_traffic;
+	int maxlen;
+	unsigned long flags;
+
+	DBFENTER;
+
+	devnum = usb_pipedevice(urb->pipe);
+	endpoint = usb_pipeendpoint(urb->pipe);
+	slow = usb_pipeslow(urb->pipe);
+	maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
+	if (usb_pipetype(urb->pipe) == PIPE_CONTROL) {
+		/* We want both IN and OUT control traffic to be put on the same EP/SB list. */
+		out_traffic = 1;
+	} else {
+		out_traffic = usb_pipeout(urb->pipe);
+	}
+
+	/* Step through att epids. */
+	for (i = 0; i < NBR_OF_EPIDS; i++) {
+		if (test_bit(i, (void *)&epid_usage_bitmask) &&
+		    test_bit(i, (void *)&epid_out_traffic) == out_traffic) {
+
+			save_flags(flags);
+			cli();
+			*R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, i);
+			nop();
+
+			if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
+				data = *R_USB_EPT_DATA_ISO;
+				restore_flags(flags);
+
+				if ((IO_MASK(R_USB_EPT_DATA_ISO, valid) & data) &&
+				    (IO_EXTRACT(R_USB_EPT_DATA_ISO, dev, data) == devnum) &&
+				    (IO_EXTRACT(R_USB_EPT_DATA_ISO, ep, data) == endpoint) &&
+				    (IO_EXTRACT(R_USB_EPT_DATA_ISO, max_len, data) == maxlen)) {
+					dbg_epid("Found epid %d for devnum %d, endpoint %d (%s)",
+						 i, devnum, endpoint, out_traffic ? "OUT" : "IN");
+					DBFEXIT;
+					return i;
+				}
+			} else {
+				data = *R_USB_EPT_DATA;
+				restore_flags(flags);
+
+				if ((IO_MASK(R_USB_EPT_DATA, valid) & data) &&
+				    (IO_EXTRACT(R_USB_EPT_DATA, dev, data) == devnum) &&
+				    (IO_EXTRACT(R_USB_EPT_DATA, ep, data) == endpoint) &&
+				    (IO_EXTRACT(R_USB_EPT_DATA, low_speed, data) == slow) &&
+				    (IO_EXTRACT(R_USB_EPT_DATA, max_len, data) == maxlen)) {
+					dbg_epid("Found epid %d for devnum %d, endpoint %d (%s)",
+						 i, devnum, endpoint, out_traffic ? "OUT" : "IN");
+					DBFEXIT;
+					return i;
+				}
+			}
+		}
+	}
+
+	DBFEXIT;
+	return -1;
+}
+
+static int etrax_usb_allocate_epid(void)
+{
+	int i;
+
+	DBFENTER;
+
+	for (i = 0; i < NBR_OF_EPIDS; i++) {
+		if (!test_bit(i, (void *)&epid_usage_bitmask)) {
+			dbg_epid("Found free epid %d", i);
+			DBFEXIT;
+			return i;
+		}
+	}
+
+	dbg_epid("Found no free epids");
+	DBFEXIT;
+	return -1;
+}
+
+static int etrax_usb_submit_urb(struct urb *urb, unsigned mem_flags)
+{
+	etrax_hc_t *hc;
+	int ret = -EINVAL;
+
+	DBFENTER;
+
+	if (!urb->dev || !urb->dev->bus) {
+		return -ENODEV;
+	}
+	if (usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)) <= 0) {
+		info("Submit urb to pipe with maxpacketlen 0, pipe 0x%X\n", urb->pipe);
+		return -EMSGSIZE;
+	}
+
+	if (urb->timeout) {
+		/* FIXME. */
+		warn("urb->timeout specified, ignoring.");
+	}
+
+	hc = (etrax_hc_t*)urb->dev->bus->hcpriv;
+
+	if (usb_pipedevice(urb->pipe) == hc->rh.devnum) {
+		/* This request is for the Virtual Root Hub. */
+		ret = etrax_rh_submit_urb(urb);
+
+	} else if (usb_pipetype(urb->pipe) == PIPE_BULK) {
+
+		ret = etrax_usb_submit_bulk_urb(urb);
+
+	} else if (usb_pipetype(urb->pipe) == PIPE_CONTROL) {
+
+		ret = etrax_usb_submit_ctrl_urb(urb);
+
+	} else if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT) {
+		int bustime;
+
+		if (urb->bandwidth == 0) {
+			bustime = usb_check_bandwidth(urb->dev, urb);
+			if (bustime < 0) {
+				ret = bustime;
+			} else {
+				ret = etrax_usb_submit_intr_urb(urb);
+				if (ret == 0)
+					usb_claim_bandwidth(urb->dev, urb, bustime, 0);
+			}
+		} else {
+			/* Bandwidth already set. */
+			ret = etrax_usb_submit_intr_urb(urb);
+		}
+
+	} else if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
+		int bustime;
+
+		if (urb->bandwidth == 0) {
+			bustime = usb_check_bandwidth(urb->dev, urb);
+			if (bustime < 0) {
+				ret = bustime;
+			} else {
+				ret = etrax_usb_submit_isoc_urb(urb);
+				if (ret == 0)
+					usb_claim_bandwidth(urb->dev, urb, bustime, 0);
+			}
+		} else {
+			/* Bandwidth already set. */
+			ret = etrax_usb_submit_isoc_urb(urb);
+		}
+	}
+
+	DBFEXIT;
+
+        if (ret != 0)
+          printk("Submit URB error %d\n", ret);
+
+	return ret;
+}
+
+static int etrax_usb_unlink_urb(struct urb *urb, int status)
+{
+	etrax_hc_t *hc;
+	etrax_urb_priv_t *urb_priv;
+	int epid;
+	unsigned int flags;
+
+	DBFENTER;
+
+	if (!urb) {
+		return -EINVAL;
+	}
+
+	/* Disable interrupts here since a descriptor interrupt for the isoc epid
+	   will modify the sb list.  This could possibly be done more granular, but
+	   unlink_urb should not be used frequently anyway.
+	*/
+
+	save_flags(flags);
+	cli();
+
+	if (!urb->dev || !urb->dev->bus) {
+		restore_flags(flags);
+		return -ENODEV;
+	}
+	if (!urb->hcpriv) {
+		/* This happens if a device driver calls unlink on an urb that
+		   was never submitted (lazy driver) or if the urb was completed
+		   while unlink was being called. */
+		restore_flags(flags);
+		return 0;
+	}
+	if (urb->transfer_flags & URB_ASYNC_UNLINK) {
+		/* FIXME. */
+		/* If URB_ASYNC_UNLINK is set:
+		   unlink
+		   move to a separate urb list
+		   call complete at next sof with ECONNRESET
+
+		   If not:
+		   wait 1 ms
+		   unlink
+		   call complete with ENOENT
+		*/
+		warn("URB_ASYNC_UNLINK set, ignoring.");
+	}
+
+	/* One might think that urb->status = -EINPROGRESS would be a requirement for unlinking,
+	   but that doesn't work for interrupt and isochronous traffic since they are completed
+	   repeatedly, and urb->status is set then. That may in itself be a bug though. */
+
+	hc = urb->dev->bus->hcpriv;
+	urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
+	epid = urb_priv->epid;
+
+	/* Set the urb status (synchronous unlink). */
+	urb->status = -ENOENT;
+	urb_priv->urb_state = UNLINK;
+
+	if (usb_pipedevice(urb->pipe) == hc->rh.devnum) {
+		int ret;
+		ret = etrax_rh_unlink_urb(urb);
+		DBFEXIT;
+		restore_flags(flags);
+		return ret;
+
+	} else if (usb_pipetype(urb->pipe) == PIPE_BULK) {
+
+		dbg_bulk("Unlink of bulk urb (0x%lx)", (unsigned long)urb);
+
+		if (TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
+			/* The EP was enabled, disable it and wait. */
+			TxBulkEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
+
+			/* Ah, the luxury of busy-wait. */
+			while (*R_DMA_CH8_SUB0_EP == virt_to_phys(&TxBulkEPList[epid]));
+		}
+		/* Kicking dummy list out of the party. */
+		TxBulkEPList[epid].next = virt_to_phys(&TxBulkEPList[(epid + 1) % NBR_OF_EPIDS]);
+
+	} else if (usb_pipetype(urb->pipe) == PIPE_CONTROL) {
+
+		dbg_ctrl("Unlink of ctrl urb (0x%lx)", (unsigned long)urb);
+
+		if (TxCtrlEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
+			/* The EP was enabled, disable it and wait. */
+			TxCtrlEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
+
+			/* Ah, the luxury of busy-wait. */
+			while (*R_DMA_CH8_SUB1_EP == virt_to_phys(&TxCtrlEPList[epid]));
+		}
+
+	} else if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT) {
+
+		dbg_intr("Unlink of intr urb (0x%lx)", (unsigned long)urb);
+
+		/* Separate function because it's a tad more complicated. */
+		etrax_usb_unlink_intr_urb(urb);
+
+	} else if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
+
+		dbg_isoc("Unlink of isoc urb (0x%lx)", (unsigned long)urb);
+
+		if (TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
+			/* The EP was enabled, disable it and wait. */
+			TxIsocEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
+
+			/* Ah, the luxury of busy-wait. */
+			while (*R_DMA_CH8_SUB3_EP == virt_to_phys(&TxIsocEPList[epid]));
+		}
+	}
+
+	/* Note that we need to remove the urb from the urb list *before* removing its SB
+	   descriptors. (This means that the isoc eof handler might get a null urb when we
+	   are unlinking the last urb.) */
+
+	if (usb_pipetype(urb->pipe) == PIPE_BULK) {
+
+		urb_list_del(urb, epid);
+		TxBulkEPList[epid].sub = 0;
+		etrax_remove_from_sb_list(urb);
+
+	} else if (usb_pipetype(urb->pipe) == PIPE_CONTROL) {
+
+		urb_list_del(urb, epid);
+		TxCtrlEPList[epid].sub = 0;
+		etrax_remove_from_sb_list(urb);
+
+	} else if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT) {
+
+		urb_list_del(urb, epid);
+		/* Sanity check (should never happen). */
+		assert(urb_list_empty(epid));
+
+		/* Release allocated bandwidth. */
+		usb_release_bandwidth(urb->dev, urb, 0);
+
+	} else if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
+
+		if (usb_pipeout(urb->pipe)) {
+
+			USB_SB_Desc_t *iter_sb, *prev_sb, *next_sb;
+
+			if (__urb_list_entry(urb, epid)) {
+
+				urb_list_del(urb, epid);
+				iter_sb = TxIsocEPList[epid].sub ? phys_to_virt(TxIsocEPList[epid].sub) : 0;
+				prev_sb = 0;
+				while (iter_sb && (iter_sb != urb_priv->first_sb)) {
+					prev_sb = iter_sb;
+					iter_sb = iter_sb->next ? phys_to_virt(iter_sb->next) : 0;
+				}
+
+				if (iter_sb == 0) {
+					/* Unlink of the URB currently being transmitted. */
+					prev_sb = 0;
+					iter_sb = TxIsocEPList[epid].sub ? phys_to_virt(TxIsocEPList[epid].sub) : 0;
+				}
+
+				while (iter_sb && (iter_sb != urb_priv->last_sb)) {
+					iter_sb = iter_sb->next ? phys_to_virt(iter_sb->next) : 0;
+				}
+				if (iter_sb) {
+					next_sb = iter_sb->next ? phys_to_virt(iter_sb->next) : 0;
+				} else {
+					/* This should only happen if the DMA has completed
+					   processing the SB list for this EP while interrupts
+					   are disabled. */
+					dbg_isoc("Isoc urb not found, already sent?");
+					next_sb = 0;
+				}
+				if (prev_sb) {
+					prev_sb->next = next_sb ? virt_to_phys(next_sb) : 0;
+				} else {
+					TxIsocEPList[epid].sub = next_sb ? virt_to_phys(next_sb) : 0;
+				}
+
+				etrax_remove_from_sb_list(urb);
+				if (urb_list_empty(epid)) {
+					TxIsocEPList[epid].sub = 0;
+					dbg_isoc("Last isoc out urb epid %d", epid);
+				} else if (next_sb || prev_sb) {
+					dbg_isoc("Re-enable isoc out epid %d", epid);
+
+					TxIsocEPList[epid].hw_len = 0;
+					TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
+				} else {
+					TxIsocEPList[epid].sub = 0;
+					dbg_isoc("URB list non-empty and no SB list, EP disabled");
+				}
+			} else {
+				dbg_isoc("Urb 0x%p not found, completed already?", urb);
+			}
+		} else {
+
+			urb_list_del(urb, epid);
+
+			/* For in traffic there is only one SB descriptor for each EP even
+			   though there may be several urbs (all urbs point at the same SB). */
+			if (urb_list_empty(epid)) {
+				/* No more urbs, remove the SB. */
+				TxIsocEPList[epid].sub = 0;
+				etrax_remove_from_sb_list(urb);
+			} else {
+				TxIsocEPList[epid].hw_len = 0;
+				TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
+			}
+		}
+		/* Release allocated bandwidth. */
+		usb_release_bandwidth(urb->dev, urb, 1);
+	}
+	/* Free the epid if urb list is empty. */
+	if (urb_list_empty(epid)) {
+		etrax_usb_free_epid(epid);
+	}
+	restore_flags(flags);
+
+	/* Must be done before calling completion handler. */
+	kfree(urb_priv);
+	urb->hcpriv = 0;
+
+	if (urb->complete) {
+		urb->complete(urb, NULL);
+	}
+
+	DBFEXIT;
+	return 0;
+}
+
+static int etrax_usb_get_frame_number(struct usb_device *usb_dev)
+{
+	DBFENTER;
+	DBFEXIT;
+	return (*R_USB_FM_NUMBER & 0x7ff);
+}
+
+static irqreturn_t etrax_usb_tx_interrupt(int irq, void *vhc)
+{
+	DBFENTER;
+
+	/* This interrupt handler could be used when unlinking EP descriptors. */
+
+	if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub0_descr)) {
+		USB_EP_Desc_t *ep;
+
+		//dbg_bulk("dma8_sub0_descr (BULK) intr.");
+
+		/* It should be safe clearing the interrupt here, since we don't expect to get a new
+		   one until we restart the bulk channel. */
+		*R_DMA_CH8_SUB0_CLR_INTR = IO_STATE(R_DMA_CH8_SUB0_CLR_INTR, clr_descr, do);
+
+		/* Wait while the DMA is running (though we don't expect it to be). */
+		while (*R_DMA_CH8_SUB0_CMD & IO_MASK(R_DMA_CH8_SUB0_CMD, cmd));
+
+		/* Advance the DMA to the next EP descriptor. */
+		ep = (USB_EP_Desc_t *)phys_to_virt(*R_DMA_CH8_SUB0_EP);
+
+		//dbg_bulk("descr intr: DMA is at 0x%lx", (unsigned long)ep);
+
+		/* ep->next is already a physical address; no need for a virt_to_phys. */
+		*R_DMA_CH8_SUB0_EP = ep->next;
+
+		/* Start the DMA bulk channel again. */
+		*R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start);
+	}
+	if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub1_descr)) {
+		struct urb *urb;
+		int epid;
+		etrax_urb_priv_t *urb_priv;
+		unsigned long int flags;
+
+		dbg_ctrl("dma8_sub1_descr (CTRL) intr.");
+		*R_DMA_CH8_SUB1_CLR_INTR = IO_STATE(R_DMA_CH8_SUB1_CLR_INTR, clr_descr, do);
+
+		/* The complete callback gets called so we cli. */
+		save_flags(flags);
+		cli();
+
+		for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) {
+			if ((TxCtrlEPList[epid].sub == 0) ||
+			    (epid == DUMMY_EPID) ||
+			    (epid == INVALID_EPID)) {
+				/* Nothing here to see. */
+				continue;
+			}
+
+			/* Get the first urb (if any). */
+			urb = urb_list_first(epid);
+
+			if (urb) {
+
+				/* Sanity check. */
+				assert(usb_pipetype(urb->pipe) == PIPE_CONTROL);
+
+				urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
+				assert(urb_priv);
+
+				if (urb_priv->urb_state == WAITING_FOR_DESCR_INTR) {
+					assert(!(TxCtrlEPList[urb_priv->epid].command & IO_MASK(USB_EP_command, enable)));
+
+					etrax_usb_complete_urb(urb, 0);
+				}
+			}
+		}
+		restore_flags(flags);
+	}
+	if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub2_descr)) {
+		dbg_intr("dma8_sub2_descr (INTR) intr.");
+		*R_DMA_CH8_SUB2_CLR_INTR = IO_STATE(R_DMA_CH8_SUB2_CLR_INTR, clr_descr, do);
+	}
+	if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub3_descr)) {
+		struct urb *urb;
+		int epid;
+		int epid_done;
+		etrax_urb_priv_t *urb_priv;
+		USB_SB_Desc_t *sb_desc;
+
+		usb_isoc_complete_data_t *comp_data = NULL;
+
+		/* One or more isoc out transfers are done. */
+		dbg_isoc("dma8_sub3_descr (ISOC) intr.");
+
+		/* For each isoc out EP search for the first sb_desc with the intr flag
+		   set.  This descriptor must be the last packet from an URB.  Then
+		   traverse the URB list for the EP until the URB with urb_priv->last_sb
+		   matching the intr-marked sb_desc is found.  All URBs before this have
+		   been sent.
+		*/
+
+		for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) {
+			/* Skip past epids with no SB lists, epids used for in traffic,
+			   and special (dummy, invalid) epids. */
+			if ((TxIsocEPList[epid].sub == 0) ||
+			    (test_bit(epid, (void *)&epid_out_traffic) == 0) ||
+			    (epid == DUMMY_EPID) ||
+			    (epid == INVALID_EPID)) {
+				/* Nothing here to see. */
+				continue;
+			}
+			sb_desc = phys_to_virt(TxIsocEPList[epid].sub);
+
+			/* Find the last descriptor of the currently active URB for this ep.
+			   This is the first descriptor in the sub list marked for a descriptor
+			   interrupt. */
+			while (sb_desc && !IO_EXTRACT(USB_SB_command, intr, sb_desc->command)) {
+				sb_desc = sb_desc->next ? phys_to_virt(sb_desc->next) : 0;
+			}
+			assert(sb_desc);
+
+			dbg_isoc("Check epid %d, sub 0x%p, SB 0x%p",
+				 epid,
+				 phys_to_virt(TxIsocEPList[epid].sub),
+				 sb_desc);
+
+			epid_done = 0;
+
+			/* Get the first urb (if any). */
+			urb = urb_list_first(epid);
+			assert(urb);
+
+			while (urb && !epid_done) {
+
+				/* Sanity check. */
+				assert(usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS);
+
+				if (!usb_pipeout(urb->pipe)) {
+					/* descr interrupts are generated only for out pipes. */
+					epid_done = 1;
+					continue;
+				}
+
+				urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
+				assert(urb_priv);
+
+				if (sb_desc != urb_priv->last_sb) {
+
+					/* This urb has been sent. */
+					dbg_isoc("out URB 0x%p sent", urb);
+
+					urb_priv->urb_state = TRANSFER_DONE;
+
+				} else if ((sb_desc == urb_priv->last_sb) &&
+					   !(TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable))) {
+
+					assert((sb_desc->command & IO_MASK(USB_SB_command, eol)) == IO_STATE(USB_SB_command, eol, yes));
+					assert(sb_desc->next == 0);
+
+					dbg_isoc("out URB 0x%p last in list, epid disabled", urb);
+					TxIsocEPList[epid].sub = 0;
+					TxIsocEPList[epid].hw_len = 0;
+					urb_priv->urb_state = TRANSFER_DONE;
+
+					epid_done = 1;
+
+				} else {
+					epid_done = 1;
+				}
+				if (!epid_done) {
+					urb = urb_list_next(urb, epid);
+				}
+			}
+
+		}
+
+		*R_DMA_CH8_SUB3_CLR_INTR = IO_STATE(R_DMA_CH8_SUB3_CLR_INTR, clr_descr, do);
+
+		comp_data = (usb_isoc_complete_data_t*)kmem_cache_alloc(isoc_compl_cache, GFP_ATOMIC);
+		assert(comp_data != NULL);
+
+                INIT_WORK(&comp_data->usb_bh, etrax_usb_isoc_descr_interrupt_bottom_half, comp_data);
+                schedule_work(&comp_data->usb_bh);
+	}
+
+	DBFEXIT;
+        return IRQ_HANDLED;
+}
+
+static void etrax_usb_isoc_descr_interrupt_bottom_half(void *data)
+{
+	usb_isoc_complete_data_t *comp_data = (usb_isoc_complete_data_t*)data;
+
+	struct urb *urb;
+	int epid;
+	int epid_done;
+	etrax_urb_priv_t *urb_priv;
+
+	DBFENTER;
+
+	dbg_isoc("dma8_sub3_descr (ISOC) bottom half.");
+
+	for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) {
+		unsigned long flags;
+
+		save_flags(flags);
+		cli();
+
+		epid_done = 0;
+
+		/* The descriptor interrupt handler has marked all transmitted isoch. out
+		   URBs with TRANSFER_DONE.  Now we traverse all epids and for all that
+ 		   have isoch. out traffic traverse its URB list and complete the
+		   transmitted URB.
+		*/
+
+		while (!epid_done) {
+
+			/* Get the first urb (if any). */
+			urb = urb_list_first(epid);
+			if (urb == 0) {
+				epid_done = 1;
+				continue;
+			}
+
+			if (usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS) {
+					epid_done = 1;
+					continue;
+			}
+
+			if (!usb_pipeout(urb->pipe)) {
+				/* descr interrupts are generated only for out pipes. */
+				epid_done = 1;
+				continue;
+			}
+
+			dbg_isoc("Check epid %d, SB 0x%p", epid, (char*)TxIsocEPList[epid].sub);
+
+			urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
+			assert(urb_priv);
+
+			if (urb_priv->urb_state == TRANSFER_DONE) {
+				int i;
+				struct usb_iso_packet_descriptor *packet;
+
+				/* This urb has been sent. */
+				dbg_isoc("Completing isoc out URB 0x%p", urb);
+
+				for (i = 0; i < urb->number_of_packets; i++) {
+					packet = &urb->iso_frame_desc[i];
+					packet->status = 0;
+					packet->actual_length = packet->length;
+				}
+
+				etrax_usb_complete_isoc_urb(urb, 0);
+
+				if (urb_list_empty(epid)) {
+					etrax_usb_free_epid(epid);
+					epid_done = 1;
+				}
+			} else {
+				epid_done = 1;
+			}
+		}
+		restore_flags(flags);
+
+	}
+	kmem_cache_free(isoc_compl_cache, comp_data);
+
+	DBFEXIT;
+}
+
+
+
+static irqreturn_t etrax_usb_rx_interrupt(int irq, void *vhc)
+{
+	struct urb *urb;
+	etrax_urb_priv_t *urb_priv;
+	int epid = 0;
+	unsigned long flags;
+
+	/* Isoc diagnostics. */
+	static int curr_fm = 0;
+	static int prev_fm = 0;
+
+	DBFENTER;
+
+	/* Clear this interrupt. */
+	*R_DMA_CH9_CLR_INTR = IO_STATE(R_DMA_CH9_CLR_INTR, clr_eop, do);
+
+	/* Note that this while loop assumes that all packets span only
+	   one rx descriptor. */
+
+	/* The reason we cli here is that we call the driver's callback functions. */
+	save_flags(flags);
+	cli();
+
+	while (myNextRxDesc->status & IO_MASK(USB_IN_status, eop)) {
+
+		epid = IO_EXTRACT(USB_IN_status, epid, myNextRxDesc->status);
+		urb = urb_list_first(epid);
+
+		//printk("eop for epid %d, first urb 0x%lx\n", epid, (unsigned long)urb);
+
+		if (!urb) {
+			err("No urb for epid %d in rx interrupt", epid);
+			__dump_ept_data(epid);
+			goto skip_out;
+		}
+
+		/* Note that we cannot indescriminately assert(usb_pipein(urb->pipe)) since
+		   ctrl pipes are not. */
+
+		if (myNextRxDesc->status & IO_MASK(USB_IN_status, error)) {
+			__u32 r_usb_ept_data;
+			int no_error = 0;
+
+			assert(test_bit(epid, (void *)&epid_usage_bitmask));
+
+			*R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
+			nop();
+			if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
+				r_usb_ept_data = *R_USB_EPT_DATA_ISO;
+
+				if ((r_usb_ept_data & IO_MASK(R_USB_EPT_DATA_ISO, valid)) &&
+				    (IO_EXTRACT(R_USB_EPT_DATA_ISO, error_code, r_usb_ept_data) == 0) &&
+				    (myNextRxDesc->status & IO_MASK(USB_IN_status, nodata))) {
+					/* Not an error, just a failure to receive an expected iso
+					   in packet in this frame.  This is not documented
+					   in the designers reference.
+					*/
+					no_error++;
+				} else {
+					warn("R_USB_EPT_DATA_ISO for epid %d = 0x%x", epid, r_usb_ept_data);
+				}
+			} else {
+				r_usb_ept_data = *R_USB_EPT_DATA;
+				warn("R_USB_EPT_DATA for epid %d = 0x%x", epid, r_usb_ept_data);
+			}
+
+			if (!no_error){
+				warn("error in rx desc->status, epid %d, first urb = 0x%lx",
+				     epid, (unsigned long)urb);
+				__dump_in_desc(myNextRxDesc);
+
+				warn("R_USB_STATUS = 0x%x", *R_USB_STATUS);
+
+				/* Check that ept was disabled when error occurred. */
+				switch (usb_pipetype(urb->pipe)) {
+				case PIPE_BULK:
+					assert(!(TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)));
+					break;
+				case PIPE_CONTROL:
+					assert(!(TxCtrlEPList[epid].command & IO_MASK(USB_EP_command, enable)));
+					break;
+				case PIPE_INTERRUPT:
+					assert(!(TxIntrEPList[epid].command & IO_MASK(USB_EP_command, enable)));
+					break;
+				case PIPE_ISOCHRONOUS:
+					assert(!(TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable)));
+					break;
+				default:
+					warn("etrax_usb_rx_interrupt: bad pipetype %d in urb 0x%p",
+					     usb_pipetype(urb->pipe),
+					     urb);
+				}
+				etrax_usb_complete_urb(urb, -EPROTO);
+				goto skip_out;
+			}
+		}
+
+		urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
+		assert(urb_priv);
+
+		if ((usb_pipetype(urb->pipe) == PIPE_BULK) ||
+		    (usb_pipetype(urb->pipe) == PIPE_CONTROL) ||
+		    (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)) {
+
+			if (myNextRxDesc->status & IO_MASK(USB_IN_status, nodata)) {
+				/* We get nodata for empty data transactions, and the rx descriptor's
+				   hw_len field is not valid in that case. No data to copy in other
+				   words. */
+			} else {
+				/* Make sure the data fits in the buffer. */
+				assert(urb_priv->rx_offset + myNextRxDesc->hw_len
+				       <= urb->transfer_buffer_length);
+
+				memcpy(urb->transfer_buffer + urb_priv->rx_offset,
+				       phys_to_virt(myNextRxDesc->buf), myNextRxDesc->hw_len);
+				urb_priv->rx_offset += myNextRxDesc->hw_len;
+			}
+
+			if (myNextRxDesc->status & IO_MASK(USB_IN_status, eot)) {
+				if ((usb_pipetype(urb->pipe) == PIPE_CONTROL) &&
+				    ((TxCtrlEPList[urb_priv->epid].command & IO_MASK(USB_EP_command, enable)) ==
+				     IO_STATE(USB_EP_command, enable, yes))) {
+					/* The EP is still enabled, so the OUT packet used to ack
+					   the in data is probably not processed yet.  If the EP
+					   sub pointer has not moved beyond urb_priv->last_sb mark
+					   it for a descriptor interrupt and complete the urb in
+					   the descriptor interrupt handler.
+					*/
+					USB_SB_Desc_t *sub = TxCtrlEPList[urb_priv->epid].sub ? phys_to_virt(TxCtrlEPList[urb_priv->epid].sub) : 0;
+
+					while ((sub != NULL) && (sub != urb_priv->last_sb)) {
+						sub = sub->next ? phys_to_virt(sub->next) : 0;
+					}
+					if (sub != NULL) {
+						/* The urb has not been fully processed. */
+						urb_priv->urb_state = WAITING_FOR_DESCR_INTR;
+					} else {
+						warn("(CTRL) epid enabled and urb (0x%p) processed, ep->sub=0x%p", urb, (char*)TxCtrlEPList[urb_priv->epid].sub);
+						etrax_usb_complete_urb(urb, 0);
+					}
+				} else {
+					etrax_usb_complete_urb(urb, 0);
+				}
+			}
+
+		} else if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
+
+			struct usb_iso_packet_descriptor *packet;
+
+			if (urb_priv->urb_state == UNLINK) {
+				info("Ignoring rx data for urb being unlinked.");
+				goto skip_out;
+			} else if (urb_priv->urb_state == NOT_STARTED) {
+				info("What? Got rx data for urb that isn't started?");
+				goto skip_out;
+			}
+
+			packet = &urb->iso_frame_desc[urb_priv->isoc_packet_counter];
+			packet->status = 0;
+
+			if (myNextRxDesc->status & IO_MASK(USB_IN_status, nodata)) {
+				/* We get nodata for empty data transactions, and the rx descriptor's
+				   hw_len field is not valid in that case. We copy 0 bytes however to
+				   stay in synch. */
+				packet->actual_length = 0;
+			} else {
+				packet->actual_length = myNextRxDesc->hw_len;
+				/* Make sure the data fits in the buffer. */
+				assert(packet->actual_length <= packet->length);
+				memcpy(urb->transfer_buffer + packet->offset,
+				       phys_to_virt(myNextRxDesc->buf), packet->actual_length);
+			}
+
+			/* Increment the packet counter. */
+			urb_priv->isoc_packet_counter++;
+
+			/* Note that we don't care about the eot field in the rx descriptor's status.
+			   It will always be set for isoc traffic. */
+			if (urb->number_of_packets == urb_priv->isoc_packet_counter) {
+
+				/* Out-of-synch diagnostics. */
+				curr_fm = (*R_USB_FM_NUMBER & 0x7ff);
+				if (((prev_fm + urb_priv->isoc_packet_counter) % (0x7ff + 1)) != curr_fm) {
+					/* This test is wrong, if there is more than one isoc
+					   in endpoint active it will always calculate wrong
+					   since prev_fm is shared by all endpoints.
+
+					   FIXME Make this check per URB using urb->start_frame.
+					*/
+					dbg_isoc("Out of synch? Previous frame = %d, current frame = %d",
+						 prev_fm, curr_fm);
+
+				}
+				prev_fm = curr_fm;
+
+				/* Complete the urb with status OK. */
+				etrax_usb_complete_isoc_urb(urb, 0);
+			}
+		}
+
+	skip_out:
+
+		/* DMA IN cache bug. Flush the DMA IN buffer from the cache. (struct etrax_dma_descr
+		   has the same layout as USB_IN_Desc for the relevant fields.) */
+		prepare_rx_descriptor((struct etrax_dma_descr*)myNextRxDesc);
+
+		myPrevRxDesc = myNextRxDesc;
+		myPrevRxDesc->command |= IO_MASK(USB_IN_command, eol);
+		myLastRxDesc->command &= ~IO_MASK(USB_IN_command, eol);
+		myLastRxDesc = myPrevRxDesc;
+
+		myNextRxDesc->status = 0;
+		myNextRxDesc = phys_to_virt(myNextRxDesc->next);
+	}
+
+	restore_flags(flags);
+
+	DBFEXIT;
+
+        return IRQ_HANDLED;
+}
+
+
+/* This function will unlink the SB descriptors associated with this urb. */
+static int etrax_remove_from_sb_list(struct urb *urb)
+{
+	USB_SB_Desc_t *next_sb, *first_sb, *last_sb;
+	etrax_urb_priv_t *urb_priv;
+	int i = 0;
+
+	DBFENTER;
+
+	urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
+	assert(urb_priv);
+
+	/* Just a sanity check. Since we don't fiddle with the DMA list the EP descriptor
+	   doesn't really need to be disabled, it's just that we expect it to be. */
+	if (usb_pipetype(urb->pipe) == PIPE_BULK) {
+		assert(!(TxBulkEPList[urb_priv->epid].command & IO_MASK(USB_EP_command, enable)));
+	} else if (usb_pipetype(urb->pipe) == PIPE_CONTROL) {
+		assert(!(TxCtrlEPList[urb_priv->epid].command & IO_MASK(USB_EP_command, enable)));
+	}
+
+	first_sb = urb_priv->first_sb;
+	last_sb = urb_priv->last_sb;
+
+	assert(first_sb);
+	assert(last_sb);
+
+	while (first_sb != last_sb) {
+		next_sb = (USB_SB_Desc_t *)phys_to_virt(first_sb->next);
+		kmem_cache_free(usb_desc_cache, first_sb);
+		first_sb = next_sb;
+		i++;
+	}
+	kmem_cache_free(usb_desc_cache, last_sb);
+	i++;
+	dbg_sb("%d SB descriptors freed", i);
+	/* Compare i with urb->number_of_packets for Isoc traffic.
+	   Should be same when calling unlink_urb */
+
+	DBFEXIT;
+
+	return i;
+}
+
+static int etrax_usb_submit_bulk_urb(struct urb *urb)
+{
+	int epid;
+	int empty;
+	unsigned long flags;
+	etrax_urb_priv_t *urb_priv;
+
+	DBFENTER;
+
+	/* Epid allocation, empty check and list add must be protected.
+	   Read about this in etrax_usb_submit_ctrl_urb. */
+
+	spin_lock_irqsave(&urb_list_lock, flags);
+	epid = etrax_usb_setup_epid(urb);
+	if (epid == -1) {
+		DBFEXIT;
+		spin_unlock_irqrestore(&urb_list_lock, flags);
+		return -ENOMEM;
+	}
+	empty = urb_list_empty(epid);
+	urb_list_add(urb, epid);
+	spin_unlock_irqrestore(&urb_list_lock, flags);
+
+	dbg_bulk("Adding bulk %s urb 0x%lx to %s list, epid %d",
+		 usb_pipein(urb->pipe) ? "IN" : "OUT", (unsigned long)urb, empty ? "empty" : "", epid);
+
+	/* Mark the urb as being in progress. */
+	urb->status = -EINPROGRESS;
+
+	/* Setup the hcpriv data. */
+	urb_priv = kzalloc(sizeof(etrax_urb_priv_t), KMALLOC_FLAG);
+	assert(urb_priv != NULL);
+	/* This sets rx_offset to 0. */
+	urb_priv->urb_state = NOT_STARTED;
+	urb->hcpriv = urb_priv;
+
+	if (empty) {
+		etrax_usb_add_to_bulk_sb_list(urb, epid);
+	}
+
+	DBFEXIT;
+
+	return 0;
+}
+
+static void etrax_usb_add_to_bulk_sb_list(struct urb *urb, int epid)
+{
+	USB_SB_Desc_t *sb_desc;
+	etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
+	unsigned long flags;
+	char maxlen;
+
+	DBFENTER;
+
+	dbg_bulk("etrax_usb_add_to_bulk_sb_list, urb 0x%lx", (unsigned long)urb);
+
+	maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
+
+	sb_desc = kmem_cache_zalloc(usb_desc_cache, SLAB_FLAG);
+	assert(sb_desc != NULL);
+
+
+	if (usb_pipeout(urb->pipe)) {
+
+		dbg_bulk("Grabbing bulk OUT, urb 0x%lx, epid %d", (unsigned long)urb, epid);
+
+		/* This is probably a sanity check of the bulk transaction length
+		   not being larger than 64 kB. */
+		if (urb->transfer_buffer_length > 0xffff) {
+			panic("urb->transfer_buffer_length > 0xffff");
+		}
+
+		sb_desc->sw_len = urb->transfer_buffer_length;
+
+		/* The rem field is don't care if it's not a full-length transfer, so setting
+		   it shouldn't hurt. Also, rem isn't used for OUT traffic. */
+		sb_desc->command = (IO_FIELD(USB_SB_command, rem, 0) |
+				    IO_STATE(USB_SB_command, tt, out) |
+				    IO_STATE(USB_SB_command, eot, yes) |
+				    IO_STATE(USB_SB_command, eol, yes));
+
+		/* The full field is set to yes, even if we don't actually check that this is
+		   a full-length transfer (i.e., that transfer_buffer_length % maxlen = 0).
+		   Setting full prevents the USB controller from sending an empty packet in
+		   that case.  However, if URB_ZERO_PACKET was set we want that. */
+		if (!(urb->transfer_flags & URB_ZERO_PACKET)) {
+			sb_desc->command |= IO_STATE(USB_SB_command, full, yes);
+		}
+
+		sb_desc->buf = virt_to_phys(urb->transfer_buffer);
+		sb_desc->next = 0;
+
+	} else if (usb_pipein(urb->pipe)) {
+
+		dbg_bulk("Grabbing bulk IN, urb 0x%lx, epid %d", (unsigned long)urb, epid);
+
+		sb_desc->sw_len = urb->transfer_buffer_length ?
+			(urb->transfer_buffer_length - 1) / maxlen + 1 : 0;
+
+		/* The rem field is don't care if it's not a full-length transfer, so setting
+		   it shouldn't hurt. */
+		sb_desc->command =
+			(IO_FIELD(USB_SB_command, rem,
+				  urb->transfer_buffer_length % maxlen) |
+			 IO_STATE(USB_SB_command, tt, in) |
+			 IO_STATE(USB_SB_command, eot, yes) |
+			 IO_STATE(USB_SB_command, eol, yes));
+
+		sb_desc->buf = 0;
+		sb_desc->next = 0;
+	}
+
+	urb_priv->first_sb = sb_desc;
+	urb_priv->last_sb = sb_desc;
+	urb_priv->epid = epid;
+
+	urb->hcpriv = urb_priv;
+
+	/* Reset toggle bits and reset error count. */
+	save_flags(flags);
+	cli();
+
+	*R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
+	nop();
+
+	/* FIXME: Is this a special case since the hold field is checked,
+	   or should we check hold in a lot of other cases as well? */
+	if (*R_USB_EPT_DATA & IO_MASK(R_USB_EPT_DATA, hold)) {
+		panic("Hold was set in %s", __FUNCTION__);
+	}
+
+	/* Reset error counters (regardless of which direction this traffic is). */
+	*R_USB_EPT_DATA &=
+		~(IO_MASK(R_USB_EPT_DATA, error_count_in) |
+		  IO_MASK(R_USB_EPT_DATA, error_count_out));
+
+	/* Software must preset the toggle bits. */
+	if (usb_pipeout(urb->pipe)) {
+		char toggle =
+			usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe));
+		*R_USB_EPT_DATA &= ~IO_MASK(R_USB_EPT_DATA, t_out);
+		*R_USB_EPT_DATA |= IO_FIELD(R_USB_EPT_DATA, t_out, toggle);
+	} else {
+		char toggle =
+			usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe));
+		*R_USB_EPT_DATA &= ~IO_MASK(R_USB_EPT_DATA, t_in);
+		*R_USB_EPT_DATA |= IO_FIELD(R_USB_EPT_DATA, t_in, toggle);
+	}
+
+	/* Assert that the EP descriptor is disabled. */
+	assert(!(TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)));
+
+	/* The reason we set the EP's sub pointer directly instead of
+	   walking the SB list and linking it last in the list is that we only
+	   have one active urb at a time (the rest are queued). */
+
+	/* Note that we cannot have interrupts running when we have set the SB descriptor
+	   but the EP is not yet enabled.  If a bulk eot happens for another EP, we will
+	   find this EP disabled and with a SB != 0, which will make us think that it's done. */
+	TxBulkEPList[epid].sub = virt_to_phys(sb_desc);
+	TxBulkEPList[epid].hw_len = 0;
+	/* Note that we don't have to fill in the ep_id field since this
+	   was done when we allocated the EP descriptors in init_tx_bulk_ep. */
+
+	/* Check if the dummy list is already with us (if several urbs were queued). */
+	if (TxBulkEPList[epid].next != virt_to_phys(&TxBulkDummyEPList[epid][0])) {
+
+		dbg_bulk("Inviting dummy list to the party for urb 0x%lx, epid %d",
+			 (unsigned long)urb, epid);
+
+		/* The last EP in the dummy list already has its next pointer set to
+		   TxBulkEPList[epid].next. */
+
+		/* We don't need to check if the DMA is at this EP or not before changing the
+		   next pointer, since we will do it in one 32-bit write (EP descriptors are
+		   32-bit aligned). */
+		TxBulkEPList[epid].next = virt_to_phys(&TxBulkDummyEPList[epid][0]);
+	}
+	/* Enable the EP descr. */
+	dbg_bulk("Enabling bulk EP for urb 0x%lx, epid %d", (unsigned long)urb, epid);
+	TxBulkEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
+
+	/* Everything is set up, safe to enable interrupts again. */
+	restore_flags(flags);
+
+	/* If the DMA bulk channel isn't running, we need to restart it if it
+	   has stopped at the last EP descriptor (DMA stopped because there was
+	   no more traffic) or if it has stopped at a dummy EP with the intr flag
+	   set (DMA stopped because we were too slow in inserting new traffic). */
+	if (!(*R_DMA_CH8_SUB0_CMD & IO_MASK(R_DMA_CH8_SUB0_CMD, cmd))) {
+
+		USB_EP_Desc_t *ep;
+		ep = (USB_EP_Desc_t *)phys_to_virt(*R_DMA_CH8_SUB0_EP);
+		dbg_bulk("DMA channel not running in add");
+		dbg_bulk("DMA is at 0x%lx", (unsigned long)ep);
+
+		if (*R_DMA_CH8_SUB0_EP == virt_to_phys(&TxBulkEPList[NBR_OF_EPIDS - 1]) ||
+		    (ep->command & 0x8) >> 3) {
+			*R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start);
+			/* Update/restart the bulk start timer since we just started the channel. */
+			mod_timer(&bulk_start_timer, jiffies + BULK_START_TIMER_INTERVAL);
+			/* Update/restart the bulk eot timer since we just inserted traffic. */
+			mod_timer(&bulk_eot_timer, jiffies + BULK_EOT_TIMER_INTERVAL);
+		}
+	}
+
+	DBFEXIT;
+}
+
+static void etrax_usb_complete_bulk_urb(struct urb *urb, int status)
+{
+	etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
+	int epid = urb_priv->epid;
+	unsigned long flags;
+
+	DBFENTER;
+
+	if (status)
+		warn("Completing bulk urb with status %d.", status);
+
+	dbg_bulk("Completing bulk urb 0x%lx for epid %d", (unsigned long)urb, epid);
+
+	/* Update the urb list. */
+	urb_list_del(urb, epid);
+
+	/* For an IN pipe, we always set the actual length, regardless of whether there was
+	   an error or not (which means the device driver can use the data if it wants to). */
+	if (usb_pipein(urb->pipe)) {
+		urb->actual_length = urb_priv->rx_offset;
+	} else {
+		/* Set actual_length for OUT urbs also; the USB mass storage driver seems
+		   to want that. We wouldn't know of any partial writes if there was an error. */
+		if (status == 0) {
+			urb->actual_length = urb->transfer_buffer_length;
+		} else {
+			urb->actual_length = 0;
+		}
+	}
+
+	/* FIXME: Is there something of the things below we shouldn't do if there was an error?
+	   Like, maybe we shouldn't toggle the toggle bits, or maybe we shouldn't insert more traffic. */
+
+	save_flags(flags);
+	cli();
+
+	*R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
+	nop();
+
+	/* We need to fiddle with the toggle bits because the hardware doesn't do it for us. */
+	if (usb_pipeout(urb->pipe)) {
+		char toggle =
+			IO_EXTRACT(R_USB_EPT_DATA, t_out, *R_USB_EPT_DATA);
+		usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+			      usb_pipeout(urb->pipe), toggle);
+	} else {
+		char toggle =
+			IO_EXTRACT(R_USB_EPT_DATA, t_in, *R_USB_EPT_DATA);
+		usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+			      usb_pipeout(urb->pipe), toggle);
+	}
+	restore_flags(flags);
+
+	/* Remember to free the SBs. */
+	etrax_remove_from_sb_list(urb);
+	kfree(urb_priv);
+	urb->hcpriv = 0;
+
+	/* If there are any more urb's in the list we'd better start sending */
+	if (!urb_list_empty(epid)) {
+
+		struct urb *new_urb;
+
+		/* Get the first urb. */
+		new_urb = urb_list_first(epid);
+		assert(new_urb);
+
+		dbg_bulk("More bulk for epid %d", epid);
+
+		etrax_usb_add_to_bulk_sb_list(new_urb, epid);
+	}
+
+	urb->status = status;
+
+	/* We let any non-zero status from the layer above have precedence. */
+	if (status == 0) {
+		/* URB_SHORT_NOT_OK means that short reads (shorter than the endpoint's max length)
+		   is to be treated as an error. */
+		if (urb->transfer_flags & URB_SHORT_NOT_OK) {
+			if (usb_pipein(urb->pipe) &&
+			    (urb->actual_length !=
+			     usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)))) {
+				urb->status = -EREMOTEIO;
+			}
+		}
+	}
+
+	if (urb->complete) {
+		urb->complete(urb, NULL);
+	}
+
+	if (urb_list_empty(epid)) {
+		/* This means that this EP is now free, deconfigure it. */
+		etrax_usb_free_epid(epid);
+
+		/* No more traffic; time to clean up.
+		   Must set sub pointer to 0, since we look at the sub pointer when handling
+		   the bulk eot interrupt. */
+
+		dbg_bulk("No bulk for epid %d", epid);
+
+		TxBulkEPList[epid].sub = 0;
+
+		/* Unlink the dummy list. */
+
+		dbg_bulk("Kicking dummy list out of party for urb 0x%lx, epid %d",
+			 (unsigned long)urb, epid);
+
+		/* No need to wait for the DMA before changing the next pointer.
+		   The modulo NBR_OF_EPIDS isn't actually necessary, since we will never use
+		   the last one (INVALID_EPID) for actual traffic. */
+		TxBulkEPList[epid].next =
+			virt_to_phys(&TxBulkEPList[(epid + 1) % NBR_OF_EPIDS]);
+	}
+
+	DBFEXIT;
+}
+
+static int etrax_usb_submit_ctrl_urb(struct urb *urb)
+{
+	int epid;
+	int empty;
+	unsigned long flags;
+	etrax_urb_priv_t *urb_priv;
+
+	DBFENTER;
+
+	/* FIXME: Return -ENXIO if there is already a queued urb for this endpoint? */
+
+	/* Epid allocation, empty check and list add must be protected.
+
+	   Epid allocation because if we find an existing epid for this endpoint an urb might be
+	   completed (emptying the list) before we add the new urb to the list, causing the epid
+	   to be de-allocated. We would then start the transfer with an invalid epid -> epid attn.
+
+	   Empty check and add because otherwise we might conclude that the list is not empty,
+	   after which it becomes empty before we add the new urb to the list, causing us not to
+	   insert the new traffic into the SB list. */
+
+	spin_lock_irqsave(&urb_list_lock, flags);
+	epid = etrax_usb_setup_epid(urb);
+	if (epid == -1) {
+		spin_unlock_irqrestore(&urb_list_lock, flags);
+		DBFEXIT;
+		return -ENOMEM;
+	}
+	empty = urb_list_empty(epid);
+	urb_list_add(urb, epid);
+	spin_unlock_irqrestore(&urb_list_lock, flags);
+
+	dbg_ctrl("Adding ctrl urb 0x%lx to %s list, epid %d",
+		 (unsigned long)urb, empty ? "empty" : "", epid);
+
+	/* Mark the urb as being in progress. */
+	urb->status = -EINPROGRESS;
+
+	/* Setup the hcpriv data. */
+	urb_priv = kzalloc(sizeof(etrax_urb_priv_t), KMALLOC_FLAG);
+	assert(urb_priv != NULL);
+	/* This sets rx_offset to 0. */
+	urb_priv->urb_state = NOT_STARTED;
+	urb->hcpriv = urb_priv;
+
+	if (empty) {
+		etrax_usb_add_to_ctrl_sb_list(urb, epid);
+	}
+
+	DBFEXIT;
+
+	return 0;
+}
+
+static void etrax_usb_add_to_ctrl_sb_list(struct urb *urb, int epid)
+{
+	USB_SB_Desc_t *sb_desc_setup;
+	USB_SB_Desc_t *sb_desc_data;
+	USB_SB_Desc_t *sb_desc_status;
+
+	etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
+
+	unsigned long flags;
+	char maxlen;
+
+	DBFENTER;
+
+	maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
+
+	sb_desc_setup = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
+	assert(sb_desc_setup != NULL);
+	sb_desc_status = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
+	assert(sb_desc_status != NULL);
+
+	/* Initialize the mandatory setup SB descriptor (used only in control transfers) */
+	sb_desc_setup->sw_len = 8;
+	sb_desc_setup->command = (IO_FIELD(USB_SB_command, rem, 0) |
+				  IO_STATE(USB_SB_command, tt, setup) |
+				  IO_STATE(USB_SB_command, full, yes) |
+				  IO_STATE(USB_SB_command, eot, yes));
+
+	sb_desc_setup->buf = virt_to_phys(urb->setup_packet);
+
+	if (usb_pipeout(urb->pipe)) {
+		dbg_ctrl("Transfer for epid %d is OUT", epid);
+
+		/* If this Control OUT transfer has an optional data stage we add an OUT token
+		   before the mandatory IN (status) token, hence the reordered SB list */
+
+		sb_desc_setup->next = virt_to_phys(sb_desc_status);
+		if (urb->transfer_buffer) {
+
+			dbg_ctrl("This OUT transfer has an extra data stage");
+
+			sb_desc_data = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
+			assert(sb_desc_data != NULL);
+
+			sb_desc_setup->next = virt_to_phys(sb_desc_data);
+
+			sb_desc_data->sw_len = urb->transfer_buffer_length;
+			sb_desc_data->command = (IO_STATE(USB_SB_command, tt, out) |
+						 IO_STATE(USB_SB_command, full, yes) |
+						 IO_STATE(USB_SB_command, eot, yes));
+			sb_desc_data->buf = virt_to_phys(urb->transfer_buffer);
+			sb_desc_data->next = virt_to_phys(sb_desc_status);
+		}
+
+		sb_desc_status->sw_len = 1;
+		sb_desc_status->command = (IO_FIELD(USB_SB_command, rem, 0) |
+					   IO_STATE(USB_SB_command, tt, in) |
+					   IO_STATE(USB_SB_command, eot, yes) |
+					   IO_STATE(USB_SB_command, intr, yes) |
+					   IO_STATE(USB_SB_command, eol, yes));
+
+		sb_desc_status->buf = 0;
+		sb_desc_status->next = 0;
+
+	} else if (usb_pipein(urb->pipe)) {
+
+		dbg_ctrl("Transfer for epid %d is IN", epid);
+		dbg_ctrl("transfer_buffer_length = %d", urb->transfer_buffer_length);
+		dbg_ctrl("rem is calculated to %d", urb->transfer_buffer_length % maxlen);
+
+		sb_desc_data = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
+		assert(sb_desc_data != NULL);
+
+		sb_desc_setup->next = virt_to_phys(sb_desc_data);
+
+		sb_desc_data->sw_len = urb->transfer_buffer_length ?
+			(urb->transfer_buffer_length - 1) / maxlen + 1 : 0;
+		dbg_ctrl("sw_len got %d", sb_desc_data->sw_len);
+
+		sb_desc_data->command =
+			(IO_FIELD(USB_SB_command, rem,
+				  urb->transfer_buffer_length % maxlen) |
+			 IO_STATE(USB_SB_command, tt, in) |
+			 IO_STATE(USB_SB_command, eot, yes));
+
+		sb_desc_data->buf = 0;
+		sb_desc_data->next = virt_to_phys(sb_desc_status);
+
+		/* Read comment at zout_buffer declaration for an explanation to this. */
+		sb_desc_status->sw_len = 1;
+		sb_desc_status->command = (IO_FIELD(USB_SB_command, rem, 0) |
+					   IO_STATE(USB_SB_command, tt, zout) |
+					   IO_STATE(USB_SB_command, full, yes) |
+					   IO_STATE(USB_SB_command, eot, yes) |
+					   IO_STATE(USB_SB_command, intr, yes) |
+					   IO_STATE(USB_SB_command, eol, yes));
+
+		sb_desc_status->buf = virt_to_phys(&zout_buffer[0]);
+		sb_desc_status->next = 0;
+	}
+
+	urb_priv->first_sb = sb_desc_setup;
+	urb_priv->last_sb = sb_desc_status;
+	urb_priv->epid = epid;
+
+	urb_priv->urb_state = STARTED;
+
+	/* Reset toggle bits and reset error count, remember to di and ei */
+	/* Warning: it is possible that this locking doesn't work with bottom-halves */
+
+	save_flags(flags);
+	cli();
+
+	*R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
+	nop();
+	if (*R_USB_EPT_DATA & IO_MASK(R_USB_EPT_DATA, hold)) {
+		panic("Hold was set in %s", __FUNCTION__);
+	}
+
+
+	/* FIXME: Compare with etrax_usb_add_to_bulk_sb_list where the toggle bits
+	   are set to a specific value. Why the difference? Read "Transfer and Toggle Bits
+	   in Designer's Reference, p. 8 - 11. */
+	*R_USB_EPT_DATA &=
+		~(IO_MASK(R_USB_EPT_DATA, error_count_in) |
+		  IO_MASK(R_USB_EPT_DATA, error_count_out) |
+		  IO_MASK(R_USB_EPT_DATA, t_in) |
+		  IO_MASK(R_USB_EPT_DATA, t_out));
+
+	/* Since we use the rx interrupt to complete ctrl urbs, we can enable interrupts now
+	   (i.e. we don't check the sub pointer on an eot interrupt like we do for bulk traffic). */
+	restore_flags(flags);
+
+	/* Assert that the EP descriptor is disabled. */
+	assert(!(TxCtrlEPList[epid].command & IO_MASK(USB_EP_command, enable)));
+
+	/* Set up and enable the EP descriptor. */
+	TxCtrlEPList[epid].sub = virt_to_phys(sb_desc_setup);
+	TxCtrlEPList[epid].hw_len = 0;
+	TxCtrlEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
+
+	/* We start the DMA sub channel without checking if it's running or not, because:
+	   1) If it's already running, issuing the start command is a nop.
+	   2) We avoid a test-and-set race condition. */
+	*R_DMA_CH8_SUB1_CMD = IO_STATE(R_DMA_CH8_SUB1_CMD, cmd, start);
+
+	DBFEXIT;
+}
+
+static void etrax_usb_complete_ctrl_urb(struct urb *urb, int status)
+{
+	etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
+	int epid = urb_priv->epid;
+
+	DBFENTER;
+
+	if (status)
+		warn("Completing ctrl urb with status %d.", status);
+
+	dbg_ctrl("Completing ctrl epid %d, urb 0x%lx", epid, (unsigned long)urb);
+
+	/* Remove this urb from the list. */
+	urb_list_del(urb, epid);
+
+	/* For an IN pipe, we always set the actual length, regardless of whether there was
+	   an error or not (which means the device driver can use the data if it wants to). */
+	if (usb_pipein(urb->pipe)) {
+		urb->actual_length = urb_priv->rx_offset;
+	}
+
+	/* FIXME: Is there something of the things below we shouldn't do if there was an error?
+	   Like, maybe we shouldn't insert more traffic. */
+
+	/* Remember to free the SBs. */
+	etrax_remove_from_sb_list(urb);
+	kfree(urb_priv);
+	urb->hcpriv = 0;
+
+	/* If there are any more urbs in the list we'd better start sending. */
+	if (!urb_list_empty(epid)) {
+		struct urb *new_urb;
+
+		/* Get the first urb. */
+		new_urb = urb_list_first(epid);
+		assert(new_urb);
+
+		dbg_ctrl("More ctrl for epid %d, first urb = 0x%lx", epid, (unsigned long)new_urb);
+
+		etrax_usb_add_to_ctrl_sb_list(new_urb, epid);
+	}
+
+	urb->status = status;
+
+	/* We let any non-zero status from the layer above have precedence. */
+	if (status == 0) {
+		/* URB_SHORT_NOT_OK means that short reads (shorter than the endpoint's max length)
+		   is to be treated as an error. */
+		if (urb->transfer_flags & URB_SHORT_NOT_OK) {
+			if (usb_pipein(urb->pipe) &&
+			    (urb->actual_length !=
+			     usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)))) {
+				urb->status = -EREMOTEIO;
+			}
+		}
+	}
+
+	if (urb->complete) {
+		urb->complete(urb, NULL);
+	}
+
+	if (urb_list_empty(epid)) {
+		/* No more traffic. Time to clean up. */
+		etrax_usb_free_epid(epid);
+		/* Must set sub pointer to 0. */
+		dbg_ctrl("No ctrl for epid %d", epid);
+		TxCtrlEPList[epid].sub = 0;
+	}
+
+	DBFEXIT;
+}
+
+static int etrax_usb_submit_intr_urb(struct urb *urb)
+{
+
+	int epid;
+
+	DBFENTER;
+
+	if (usb_pipeout(urb->pipe)) {
+		/* Unsupported transfer type.
+		   We don't support interrupt out traffic. (If we do, we can't support
+		   intervals for neither in or out traffic, but are forced to schedule all
+		   interrupt traffic in one frame.) */
+		return -EINVAL;
+	}
+
+	epid = etrax_usb_setup_epid(urb);
+	if (epid == -1) {
+		DBFEXIT;
+		return -ENOMEM;
+	}
+
+	if (!urb_list_empty(epid)) {
+		/* There is already a queued urb for this endpoint. */
+		etrax_usb_free_epid(epid);
+		return -ENXIO;
+	}
+
+	urb->status = -EINPROGRESS;
+
+	dbg_intr("Add intr urb 0x%lx, to list, epid %d", (unsigned long)urb, epid);
+
+	urb_list_add(urb, epid);
+	etrax_usb_add_to_intr_sb_list(urb, epid);
+
+	return 0;
+
+	DBFEXIT;
+}
+
+static void etrax_usb_add_to_intr_sb_list(struct urb *urb, int epid)
+{
+
+	volatile USB_EP_Desc_t *tmp_ep;
+	volatile USB_EP_Desc_t *first_ep;
+
+	char maxlen;
+	int interval;
+	int i;
+
+	etrax_urb_priv_t *urb_priv;
+
+	DBFENTER;
+
+	maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
+	interval = urb->interval;
+
+	urb_priv = kzalloc(sizeof(etrax_urb_priv_t), KMALLOC_FLAG);
+	assert(urb_priv != NULL);
+	urb->hcpriv = urb_priv;
+
+	first_ep = &TxIntrEPList[0];
+
+	/* Round of the interval to 2^n, it is obvious that this code favours
+	   smaller numbers, but that is actually a good thing */
+	/* FIXME: The "rounding error" for larger intervals will be quite
+	   large. For in traffic this shouldn't be a problem since it will only
+	   mean that we "poll" more often. */
+	for (i = 0; interval; i++) {
+		interval = interval >> 1;
+	}
+	interval = 1 << (i - 1);
+
+	dbg_intr("Interval rounded to %d", interval);
+
+	tmp_ep = first_ep;
+	i = 0;
+	do {
+		if (tmp_ep->command & IO_MASK(USB_EP_command, eof)) {
+			if ((i % interval) == 0) {
+				/* Insert the traffic ep after tmp_ep */
+				USB_EP_Desc_t *ep_desc;
+				USB_SB_Desc_t *sb_desc;
+
+				dbg_intr("Inserting EP for epid %d", epid);
+
+				ep_desc = (USB_EP_Desc_t *)
+					kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
+				sb_desc = (USB_SB_Desc_t *)
+					kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
+				assert(ep_desc != NULL);
+				CHECK_ALIGN(ep_desc);
+				assert(sb_desc != NULL);
+
+				ep_desc->sub = virt_to_phys(sb_desc);
+				ep_desc->hw_len = 0;
+				ep_desc->command = (IO_FIELD(USB_EP_command, epid, epid) |
+						    IO_STATE(USB_EP_command, enable, yes));
+
+
+				/* Round upwards the number of packets of size maxlen
+				   that this SB descriptor should receive. */
+				sb_desc->sw_len = urb->transfer_buffer_length ?
+					(urb->transfer_buffer_length - 1) / maxlen + 1 : 0;
+				sb_desc->next = 0;
+				sb_desc->buf = 0;
+				sb_desc->command =
+					(IO_FIELD(USB_SB_command, rem, urb->transfer_buffer_length % maxlen) |
+					 IO_STATE(USB_SB_command, tt, in) |
+					 IO_STATE(USB_SB_command, eot, yes) |
+					 IO_STATE(USB_SB_command, eol, yes));
+
+				ep_desc->next = tmp_ep->next;
+				tmp_ep->next = virt_to_phys(ep_desc);
+			}
+			i++;
+		}
+		tmp_ep = (USB_EP_Desc_t *)phys_to_virt(tmp_ep->next);
+	} while (tmp_ep != first_ep);
+
+
+	/* Note that first_sb/last_sb doesn't apply to interrupt traffic. */
+	urb_priv->epid = epid;
+
+	/* We start the DMA sub channel without checking if it's running or not, because:
+	   1) If it's already running, issuing the start command is a nop.
+	   2) We avoid a test-and-set race condition. */
+	*R_DMA_CH8_SUB2_CMD = IO_STATE(R_DMA_CH8_SUB2_CMD, cmd, start);
+
+	DBFEXIT;
+}
+
+
+
+static void etrax_usb_complete_intr_urb(struct urb *urb, int status)
+{
+	etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
+	int epid = urb_priv->epid;
+
+	DBFENTER;
+
+	if (status)
+		warn("Completing intr urb with status %d.", status);
+
+	dbg_intr("Completing intr epid %d, urb 0x%lx", epid, (unsigned long)urb);
+
+	urb->status = status;
+	urb->actual_length = urb_priv->rx_offset;
+
+	dbg_intr("interrupt urb->actual_length = %d", urb->actual_length);
+
+	/* We let any non-zero status from the layer above have precedence. */
+	if (status == 0) {
+		/* URB_SHORT_NOT_OK means that short reads (shorter than the endpoint's max length)
+		   is to be treated as an error. */
+		if (urb->transfer_flags & URB_SHORT_NOT_OK) {
+			if (urb->actual_length !=
+			    usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe))) {
+				urb->status = -EREMOTEIO;
+			}
+		}
+	}
+
+	/* The driver will resubmit the URB so we need to remove it first */
+        etrax_usb_unlink_urb(urb, 0);
+	if (urb->complete) {
+		urb->complete(urb, NULL);
+	}
+
+	DBFEXIT;
+}
+
+
+static int etrax_usb_submit_isoc_urb(struct urb *urb)
+{
+	int epid;
+	unsigned long flags;
+
+	DBFENTER;
+
+	dbg_isoc("Submitting isoc urb = 0x%lx", (unsigned long)urb);
+
+	/* Epid allocation, empty check and list add must be protected.
+	   Read about this in etrax_usb_submit_ctrl_urb. */
+
+	spin_lock_irqsave(&urb_list_lock, flags);
+	/* Is there an active epid for this urb ? */
+	epid = etrax_usb_setup_epid(urb);
+	if (epid == -1) {
+		DBFEXIT;
+		spin_unlock_irqrestore(&urb_list_lock, flags);
+		return -ENOMEM;
+	}
+
+	/* Ok, now we got valid endpoint, lets insert some traffic */
+
+	urb->status = -EINPROGRESS;
+
+	/* Find the last urb in the URB_List and add this urb after that one.
+	   Also add the traffic, that is do an etrax_usb_add_to_isoc_sb_list.  This
+	   is important to make this in "real time" since isochronous traffic is
+	   time sensitive. */
+
+	dbg_isoc("Adding isoc urb to (possibly empty) list");
+	urb_list_add(urb, epid);
+	etrax_usb_add_to_isoc_sb_list(urb, epid);
+	spin_unlock_irqrestore(&urb_list_lock, flags);
+
+	DBFEXIT;
+
+	return 0;
+}
+
+static void etrax_usb_check_error_isoc_ep(const int epid)
+{
+	unsigned long int flags;
+	int error_code;
+	__u32 r_usb_ept_data;
+
+	/* We can't read R_USB_EPID_ATTN here since it would clear the iso_eof,
+	   bulk_eot and epid_attn interrupts.  So we just check the status of
+	   the epid without testing if for it in R_USB_EPID_ATTN. */
+
+
+	save_flags(flags);
+	cli();
+	*R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
+	nop();
+	/* Note that although there are separate R_USB_EPT_DATA and R_USB_EPT_DATA_ISO
+	   registers, they are located at the same address and are of the same size.
+	   In other words, this read should be ok for isoc also. */
+	r_usb_ept_data = *R_USB_EPT_DATA;
+	restore_flags(flags);
+
+	error_code = IO_EXTRACT(R_USB_EPT_DATA_ISO, error_code, r_usb_ept_data);
+
+	if (r_usb_ept_data & IO_MASK(R_USB_EPT_DATA, hold)) {
+		warn("Hold was set for epid %d.", epid);
+		return;
+	}
+
+	if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA_ISO, error_code, no_error)) {
+
+		/* This indicates that the SB list of the ept was completed before
+		   new data was appended to it.  This is not an error, but indicates
+		   large system or USB load and could possibly cause trouble for
+		   very timing sensitive USB device drivers so we log it.
+		*/
+		info("Isoc. epid %d disabled with no error", epid);
+		return;
+
+	} else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA_ISO, error_code, stall)) {
+		/* Not really a protocol error, just says that the endpoint gave
+		   a stall response. Note that error_code cannot be stall for isoc. */
+		panic("Isoc traffic cannot stall");
+
+	} else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA_ISO, error_code, bus_error)) {
+		/* Two devices responded to a transaction request. Must be resolved
+		   by software. FIXME: Reset ports? */
+		panic("Bus error for epid %d."
+		      " Two devices responded to transaction request",
+		      epid);
+
+	} else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, buffer_error)) {
+		/* DMA overrun or underrun. */
+		warn("Buffer overrun/underrun for epid %d. DMA too busy?", epid);
+
+		/* It seems that error_code = buffer_error in
+		   R_USB_EPT_DATA/R_USB_EPT_DATA_ISO and ourun = yes in R_USB_STATUS
+		   are the same error. */
+	}
+}
+
+
+static void etrax_usb_add_to_isoc_sb_list(struct urb *urb, int epid)
+{
+
+	int i = 0;
+
+	etrax_urb_priv_t *urb_priv;
+	USB_SB_Desc_t *prev_sb_desc,  *next_sb_desc, *temp_sb_desc;
+
+	DBFENTER;
+
+	prev_sb_desc = next_sb_desc = temp_sb_desc = NULL;
+
+	urb_priv = kzalloc(sizeof(etrax_urb_priv_t), GFP_ATOMIC);
+	assert(urb_priv != NULL);
+
+	urb->hcpriv = urb_priv;
+	urb_priv->epid = epid;
+
+	if (usb_pipeout(urb->pipe)) {
+
+		if (urb->number_of_packets == 0) panic("etrax_usb_add_to_isoc_sb_list 0 packets\n");
+
+		dbg_isoc("Transfer for epid %d is OUT", epid);
+		dbg_isoc("%d packets in URB", urb->number_of_packets);
+
+		/* Create one SB descriptor for each packet and link them together. */
+		for (i = 0; i < urb->number_of_packets; i++) {
+			if (!urb->iso_frame_desc[i].length)
+				continue;
+
+			next_sb_desc = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, GFP_ATOMIC);
+			assert(next_sb_desc != NULL);
+
+			if (urb->iso_frame_desc[i].length > 0) {
+
+				next_sb_desc->command = (IO_STATE(USB_SB_command, tt, out) |
+							 IO_STATE(USB_SB_command, eot, yes));
+
+				next_sb_desc->sw_len = urb->iso_frame_desc[i].length;
+				next_sb_desc->buf = virt_to_phys((char*)urb->transfer_buffer + urb->iso_frame_desc[i].offset);
+
+				/* Check if full length transfer. */
+				if (urb->iso_frame_desc[i].length ==
+				    usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe))) {
+					next_sb_desc->command |= IO_STATE(USB_SB_command, full, yes);
+				}
+			} else {
+				dbg_isoc("zero len packet");
+				next_sb_desc->command = (IO_FIELD(USB_SB_command, rem, 0) |
+							 IO_STATE(USB_SB_command, tt, zout) |
+							 IO_STATE(USB_SB_command, eot, yes) |
+							 IO_STATE(USB_SB_command, full, yes));
+
+				next_sb_desc->sw_len = 1;
+				next_sb_desc->buf = virt_to_phys(&zout_buffer[0]);
+			}
+
+			/* First SB descriptor that belongs to this urb */
+			if (i == 0)
+				urb_priv->first_sb = next_sb_desc;
+			else
+				prev_sb_desc->next = virt_to_phys(next_sb_desc);
+
+			prev_sb_desc = next_sb_desc;
+		}
+
+		next_sb_desc->command |= (IO_STATE(USB_SB_command, intr, yes) |
+					  IO_STATE(USB_SB_command, eol, yes));
+		next_sb_desc->next = 0;
+		urb_priv->last_sb = next_sb_desc;
+
+	} else if (usb_pipein(urb->pipe)) {
+
+		dbg_isoc("Transfer for epid %d is IN", epid);
+		dbg_isoc("transfer_buffer_length = %d", urb->transfer_buffer_length);
+		dbg_isoc("rem is calculated to %d", urb->iso_frame_desc[urb->number_of_packets - 1].length);
+
+		/* Note that in descriptors for periodic traffic are not consumed. This means that
+		   the USB controller never propagates in the SB list. In other words, if there already
+		   is an SB descriptor in the list for this EP we don't have to do anything. */
+		if (TxIsocEPList[epid].sub == 0) {
+			dbg_isoc("Isoc traffic not already running, allocating SB");
+
+			next_sb_desc = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, GFP_ATOMIC);
+			assert(next_sb_desc != NULL);
+
+			next_sb_desc->command = (IO_STATE(USB_SB_command, tt, in) |
+						 IO_STATE(USB_SB_command, eot, yes) |
+						 IO_STATE(USB_SB_command, eol, yes));
+
+			next_sb_desc->next = 0;
+			next_sb_desc->sw_len = 1; /* Actual number of packets is not relevant
+						     for periodic in traffic as long as it is more
+						     than zero.  Set to 1 always. */
+			next_sb_desc->buf = 0;
+
+			/* The rem field is don't care for isoc traffic, so we don't set it. */
+
+			/* Only one SB descriptor that belongs to this urb. */
+			urb_priv->first_sb = next_sb_desc;
+			urb_priv->last_sb = next_sb_desc;
+
+		} else {
+
+			dbg_isoc("Isoc traffic already running, just setting first/last_sb");
+
+			/* Each EP for isoc in will have only one SB descriptor, setup when submitting the
+			   already active urb. Note that even though we may have several first_sb/last_sb
+			   pointing at the same SB descriptor, they are freed only once (when the list has
+			   become empty). */
+			urb_priv->first_sb = phys_to_virt(TxIsocEPList[epid].sub);
+			urb_priv->last_sb = phys_to_virt(TxIsocEPList[epid].sub);
+			return;
+		}
+
+	}
+
+	/* Find the spot to insert this urb and add it. */
+	if (TxIsocEPList[epid].sub == 0) {
+		/* First SB descriptor inserted in this list (in or out). */
+		dbg_isoc("Inserting SB desc first in list");
+		TxIsocEPList[epid].hw_len = 0;
+		TxIsocEPList[epid].sub = virt_to_phys(urb_priv->first_sb);
+
+	} else {
+		/* Isochronous traffic is already running, insert new traffic last (only out). */
+		dbg_isoc("Inserting SB desc last in list");
+		temp_sb_desc = phys_to_virt(TxIsocEPList[epid].sub);
+		while ((temp_sb_desc->command & IO_MASK(USB_SB_command, eol)) !=
+		       IO_STATE(USB_SB_command, eol, yes)) {
+			assert(temp_sb_desc->next);
+			temp_sb_desc = phys_to_virt(temp_sb_desc->next);
+		}
+		dbg_isoc("Appending list on desc 0x%p", temp_sb_desc);
+
+		/* Next pointer must be set before eol is removed. */
+		temp_sb_desc->next = virt_to_phys(urb_priv->first_sb);
+		/* Clear the previous end of list flag since there is a new in the
+		   added SB descriptor list. */
+		temp_sb_desc->command &= ~IO_MASK(USB_SB_command, eol);
+
+		if (!(TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable))) {
+			/* 8.8.5 in Designer's Reference says we should check for and correct
+			   any errors in the EP here.  That should not be necessary if epid_attn
+			   is handled correctly, so we assume all is ok. */
+			dbg_isoc("EP disabled");
+			etrax_usb_check_error_isoc_ep(epid);
+
+			/* The SB list was exhausted. */
+			if (virt_to_phys(urb_priv->last_sb) != TxIsocEPList[epid].sub) {
+				/* The new sublist did not get processed before the EP was
+				   disabled.  Setup the EP again. */
+				dbg_isoc("Set EP sub to new list");
+				TxIsocEPList[epid].hw_len = 0;
+				TxIsocEPList[epid].sub = virt_to_phys(urb_priv->first_sb);
+			}
+		}
+	}
+
+	if (urb->transfer_flags & URB_ISO_ASAP) {
+		/* The isoc transfer should be started as soon as possible. The start_frame
+		   field is a return value if URB_ISO_ASAP was set. Comparing R_USB_FM_NUMBER
+		   with a USB Chief trace shows that the first isoc IN token is sent 2 frames
+		   later. I'm not sure how this affects usage of the start_frame field by the
+		   device driver, or how it affects things when USB_ISO_ASAP is not set, so
+		   therefore there's no compensation for the 2 frame "lag" here. */
+		urb->start_frame = (*R_USB_FM_NUMBER & 0x7ff);
+		TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
+		urb_priv->urb_state = STARTED;
+		dbg_isoc("URB_ISO_ASAP set, urb->start_frame set to %d", urb->start_frame);
+	} else {
+		/* Not started yet. */
+		urb_priv->urb_state = NOT_STARTED;
+		dbg_isoc("urb_priv->urb_state set to NOT_STARTED");
+	}
+
+       /* We start the DMA sub channel without checking if it's running or not, because:
+	  1) If it's already running, issuing the start command is a nop.
+	  2) We avoid a test-and-set race condition. */
+	*R_DMA_CH8_SUB3_CMD = IO_STATE(R_DMA_CH8_SUB3_CMD, cmd, start);
+
+	DBFEXIT;
+}
+
+static void etrax_usb_complete_isoc_urb(struct urb *urb, int status)
+{
+	etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
+	int epid = urb_priv->epid;
+	int auto_resubmit = 0;
+
+	DBFENTER;
+	dbg_isoc("complete urb 0x%p, status %d", urb, status);
+
+	if (status)
+		warn("Completing isoc urb with status %d.", status);
+
+	if (usb_pipein(urb->pipe)) {
+		int i;
+
+		/* Make that all isoc packets have status and length set before
+		   completing the urb. */
+		for (i = urb_priv->isoc_packet_counter; i < urb->number_of_packets; i++) {
+			urb->iso_frame_desc[i].actual_length = 0;
+			urb->iso_frame_desc[i].status = -EPROTO;
+		}
+
+		urb_list_del(urb, epid);
+
+		if (!list_empty(&urb_list[epid])) {
+			((etrax_urb_priv_t *)(urb_list_first(epid)->hcpriv))->urb_state = STARTED;
+		} else {
+			unsigned long int flags;
+			if (TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
+				/* The EP was enabled, disable it and wait. */
+				TxIsocEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
+
+				/* Ah, the luxury of busy-wait. */
+				while (*R_DMA_CH8_SUB3_EP == virt_to_phys(&TxIsocEPList[epid]));
+			}
+
+			etrax_remove_from_sb_list(urb);
+			TxIsocEPList[epid].sub = 0;
+			TxIsocEPList[epid].hw_len = 0;
+
+			save_flags(flags);
+			cli();
+			etrax_usb_free_epid(epid);
+			restore_flags(flags);
+		}
+
+		urb->hcpriv = 0;
+		kfree(urb_priv);
+
+		/* Release allocated bandwidth. */
+		usb_release_bandwidth(urb->dev, urb, 0);
+	} else if (usb_pipeout(urb->pipe)) {
+		int freed_descr;
+
+		dbg_isoc("Isoc out urb complete 0x%p", urb);
+
+		/* Update the urb list. */
+		urb_list_del(urb, epid);
+
+		freed_descr = etrax_remove_from_sb_list(urb);
+		dbg_isoc("freed %d descriptors of %d packets", freed_descr, urb->number_of_packets);
+		assert(freed_descr == urb->number_of_packets);
+		urb->hcpriv = 0;
+		kfree(urb_priv);
+
+		/* Release allocated bandwidth. */
+		usb_release_bandwidth(urb->dev, urb, 0);
+	}
+
+	urb->status = status;
+	if (urb->complete) {
+		urb->complete(urb, NULL);
+	}
+
+	if (auto_resubmit) {
+		/* Check that urb was not unlinked by the complete callback. */
+		if (__urb_list_entry(urb, epid)) {
+			/* Move this one down the list. */
+			urb_list_move_last(urb, epid);
+
+			/* Mark the now first urb as started (may already be). */
+			((etrax_urb_priv_t *)(urb_list_first(epid)->hcpriv))->urb_state = STARTED;
+
+			/* Must set this to 0 since this urb is still active after
+			   completion. */
+			urb_priv->isoc_packet_counter = 0;
+		} else {
+			warn("(ISOC) automatic resubmit urb 0x%p removed by complete.", urb);
+		}
+	}
+
+	DBFEXIT;
+}
+
+static void etrax_usb_complete_urb(struct urb *urb, int status)
+{
+	switch (usb_pipetype(urb->pipe)) {
+	case PIPE_BULK:
+		etrax_usb_complete_bulk_urb(urb, status);
+		break;
+	case PIPE_CONTROL:
+		etrax_usb_complete_ctrl_urb(urb, status);
+		break;
+	case PIPE_INTERRUPT:
+		etrax_usb_complete_intr_urb(urb, status);
+		break;
+	case PIPE_ISOCHRONOUS:
+		etrax_usb_complete_isoc_urb(urb, status);
+		break;
+	default:
+		err("Unknown pipetype");
+	}
+}
+
+
+
+static irqreturn_t etrax_usb_hc_interrupt_top_half(int irq, void *vhc)
+{
+	usb_interrupt_registers_t *reg;
+	unsigned long flags;
+	__u32 irq_mask;
+	__u8 status;
+	__u32 epid_attn;
+	__u16 port_status_1;
+	__u16 port_status_2;
+	__u32 fm_number;
+
+	DBFENTER;
+
+	/* Read critical registers into local variables, do kmalloc afterwards. */
+	save_flags(flags);
+	cli();
+
+	irq_mask = *R_USB_IRQ_MASK_READ;
+	/* Reading R_USB_STATUS clears the ctl_status interrupt. Note that R_USB_STATUS
+	   must be read before R_USB_EPID_ATTN since reading the latter clears the
+	   ourun and perror fields of R_USB_STATUS. */
+	status = *R_USB_STATUS;
+
+	/* Reading R_USB_EPID_ATTN clears the iso_eof, bulk_eot and epid_attn interrupts. */
+	epid_attn = *R_USB_EPID_ATTN;
+
+	/* Reading R_USB_RH_PORT_STATUS_1 and R_USB_RH_PORT_STATUS_2 clears the
+	   port_status interrupt. */
+	port_status_1 = *R_USB_RH_PORT_STATUS_1;
+	port_status_2 = *R_USB_RH_PORT_STATUS_2;
+
+	/* Reading R_USB_FM_NUMBER clears the sof interrupt. */
+	/* Note: the lower 11 bits contain the actual frame number, sent with each sof. */
+	fm_number = *R_USB_FM_NUMBER;
+
+	restore_flags(flags);
+
+	reg = (usb_interrupt_registers_t *)kmem_cache_alloc(top_half_reg_cache, GFP_ATOMIC);
+
+	assert(reg != NULL);
+
+	reg->hc = (etrax_hc_t *)vhc;
+
+	/* Now put register values into kmalloc'd area. */
+	reg->r_usb_irq_mask_read = irq_mask;
+	reg->r_usb_status = status;
+	reg->r_usb_epid_attn = epid_attn;
+	reg->r_usb_rh_port_status_1 = port_status_1;
+	reg->r_usb_rh_port_status_2 = port_status_2;
+	reg->r_usb_fm_number = fm_number;
+
+        INIT_WORK(&reg->usb_bh, etrax_usb_hc_interrupt_bottom_half, reg);
+        schedule_work(&reg->usb_bh);
+
+	DBFEXIT;
+
+        return IRQ_HANDLED;
+}
+
+static void etrax_usb_hc_interrupt_bottom_half(void *data)
+{
+	usb_interrupt_registers_t *reg = (usb_interrupt_registers_t *)data;
+	__u32 irq_mask = reg->r_usb_irq_mask_read;
+
+	DBFENTER;
+
+	/* Interrupts are handled in order of priority. */
+	if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, epid_attn)) {
+		etrax_usb_hc_epid_attn_interrupt(reg);
+	}
+	if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, port_status)) {
+		etrax_usb_hc_port_status_interrupt(reg);
+	}
+	if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, ctl_status)) {
+		etrax_usb_hc_ctl_status_interrupt(reg);
+	}
+	if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, iso_eof)) {
+		etrax_usb_hc_isoc_eof_interrupt();
+	}
+	if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, bulk_eot)) {
+		/* Update/restart the bulk start timer since obviously the channel is running. */
+		mod_timer(&bulk_start_timer, jiffies + BULK_START_TIMER_INTERVAL);
+		/* Update/restart the bulk eot timer since we just received an bulk eot interrupt. */
+		mod_timer(&bulk_eot_timer, jiffies + BULK_EOT_TIMER_INTERVAL);
+
+		etrax_usb_hc_bulk_eot_interrupt(0);
+	}
+
+	kmem_cache_free(top_half_reg_cache, reg);
+
+	DBFEXIT;
+}
+
+
+void etrax_usb_hc_isoc_eof_interrupt(void)
+{
+	struct urb *urb;
+	etrax_urb_priv_t *urb_priv;
+	int epid;
+	unsigned long flags;
+
+	DBFENTER;
+
+	/* Do not check the invalid epid (it has a valid sub pointer). */
+	for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) {
+
+		/* Do not check the invalid epid (it has a valid sub pointer). */
+		if ((epid == DUMMY_EPID) || (epid == INVALID_EPID))
+			continue;
+
+		/* Disable interrupts to block the isoc out descriptor interrupt handler
+		   from being called while the isoc EPID list is being checked.
+		*/
+		save_flags(flags);
+		cli();
+
+		if (TxIsocEPList[epid].sub == 0) {
+			/* Nothing here to see. */
+			restore_flags(flags);
+			continue;
+		}
+
+		/* Get the first urb (if any). */
+		urb = urb_list_first(epid);
+		if (urb == 0) {
+			warn("Ignoring NULL urb");
+			restore_flags(flags);
+			continue;
+		}
+		if (usb_pipein(urb->pipe)) {
+
+			/* Sanity check. */
+			assert(usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS);
+
+			urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
+			assert(urb_priv);
+
+			if (urb_priv->urb_state == NOT_STARTED) {
+
+				/* If ASAP is not set and urb->start_frame is the current frame,
+				   start the transfer. */
+				if (!(urb->transfer_flags & URB_ISO_ASAP) &&
+				    (urb->start_frame == (*R_USB_FM_NUMBER & 0x7ff))) {
+
+					dbg_isoc("Enabling isoc IN EP descr for epid %d", epid);
+					TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
+
+					/* This urb is now active. */
+					urb_priv->urb_state = STARTED;
+					continue;
+				}
+			}
+		}
+		restore_flags(flags);
+	}
+
+	DBFEXIT;
+
+}
+
+void etrax_usb_hc_bulk_eot_interrupt(int timer_induced)
+{
+ 	int epid;
+
+	/* The technique is to run one urb at a time, wait for the eot interrupt at which
+	   point the EP descriptor has been disabled. */
+
+	DBFENTER;
+	dbg_bulk("bulk eot%s", timer_induced ? ", called by timer" : "");
+
+	for (epid = 0; epid < NBR_OF_EPIDS; epid++) {
+
+		if (!(TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) &&
+		    (TxBulkEPList[epid].sub != 0)) {
+
+			struct urb *urb;
+			etrax_urb_priv_t *urb_priv;
+			unsigned long flags;
+			__u32 r_usb_ept_data;
+
+			/* Found a disabled EP descriptor which has a non-null sub pointer.
+			   Verify that this ctrl EP descriptor got disabled no errors.
+			   FIXME: Necessary to check error_code? */
+			dbg_bulk("for epid %d?", epid);
+
+			/* Get the first urb. */
+			urb = urb_list_first(epid);
+
+			/* FIXME: Could this happen for valid reasons? Why did it disappear? Because of
+			   wrong unlinking? */
+			if (!urb) {
+				warn("NULL urb for epid %d", epid);
+				continue;
+			}
+
+			assert(urb);
+			urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
+			assert(urb_priv);
+
+			/* Sanity checks. */
+			assert(usb_pipetype(urb->pipe) == PIPE_BULK);
+			if (phys_to_virt(TxBulkEPList[epid].sub) != urb_priv->last_sb) {
+				err("bulk endpoint got disabled before reaching last sb");
+			}
+
+			/* For bulk IN traffic, there seems to be a race condition between
+			   between the bulk eot and eop interrupts, or rather an uncertainty regarding
+			   the order in which they happen. Normally we expect the eop interrupt from
+			   DMA channel 9 to happen before the eot interrupt.
+
+			   Therefore, we complete the bulk IN urb in the rx interrupt handler instead. */
+
+			if (usb_pipein(urb->pipe)) {
+				dbg_bulk("in urb, continuing");
+				continue;
+			}
+
+			save_flags(flags);
+			cli();
+			*R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
+			nop();
+			r_usb_ept_data = *R_USB_EPT_DATA;
+			restore_flags(flags);
+
+			if (IO_EXTRACT(R_USB_EPT_DATA, error_code, r_usb_ept_data) ==
+			    IO_STATE_VALUE(R_USB_EPT_DATA, error_code, no_error)) {
+				/* This means that the endpoint has no error, is disabled
+				   and had inserted traffic, i.e. transfer successfully completed. */
+				etrax_usb_complete_bulk_urb(urb, 0);
+			} else {
+				/* Shouldn't happen. We expect errors to be caught by epid attention. */
+				err("Found disabled bulk EP desc, error_code != no_error");
+			}
+		}
+	}
+
+	/* Normally, we should find (at least) one disabled EP descriptor with a valid sub pointer.
+	   However, because of the uncertainty in the deliverance of the eop/eot interrupts, we may
+	   not.  Also, we might find two disabled EPs when handling an eot interrupt, and then find
+	   none the next time. */
+
+	DBFEXIT;
+
+}
+
+void etrax_usb_hc_epid_attn_interrupt(usb_interrupt_registers_t *reg)
+{
+	/* This function handles the epid attention interrupt.  There are a variety of reasons
+	   for this interrupt to happen (Designer's Reference, p. 8 - 22 for the details):
+
+	   invalid ep_id  - Invalid epid in an EP (EP disabled).
+	   stall	  - Not strictly an error condition (EP disabled).
+	   3rd error      - Three successive transaction errors  (EP disabled).
+	   buffer ourun   - Buffer overrun or underrun (EP disabled).
+	   past eof1      - Intr or isoc transaction proceeds past EOF1.
+	   near eof       - Intr or isoc transaction would not fit inside the frame.
+	   zout transfer  - If zout transfer for a bulk endpoint (EP disabled).
+	   setup transfer - If setup transfer for a non-ctrl endpoint (EP disabled). */
+
+	int epid;
+
+
+	DBFENTER;
+
+	assert(reg != NULL);
+
+	/* Note that we loop through all epids. We still want to catch errors for
+	   the invalid one, even though we might handle them differently. */
+	for (epid = 0; epid < NBR_OF_EPIDS; epid++) {
+
+		if (test_bit(epid, (void *)&reg->r_usb_epid_attn)) {
+
+			struct urb *urb;
+			__u32 r_usb_ept_data;
+			unsigned long flags;
+			int error_code;
+
+			save_flags(flags);
+			cli();
+			*R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
+			nop();
+			/* Note that although there are separate R_USB_EPT_DATA and R_USB_EPT_DATA_ISO
+			   registers, they are located at the same address and are of the same size.
+			   In other words, this read should be ok for isoc also. */
+			r_usb_ept_data = *R_USB_EPT_DATA;
+			restore_flags(flags);
+
+			/* First some sanity checks. */
+			if (epid == INVALID_EPID) {
+				/* FIXME: What if it became disabled? Could seriously hurt interrupt
+				   traffic. (Use do_intr_recover.) */
+				warn("Got epid_attn for INVALID_EPID (%d).", epid);
+				err("R_USB_EPT_DATA = 0x%x", r_usb_ept_data);
+				err("R_USB_STATUS = 0x%x", reg->r_usb_status);
+				continue;
+			} else 	if (epid == DUMMY_EPID) {
+				/* We definitely don't care about these ones. Besides, they are
+				   always disabled, so any possible disabling caused by the
+				   epid attention interrupt is irrelevant. */
+				warn("Got epid_attn for DUMMY_EPID (%d).", epid);
+				continue;
+			}
+
+			/* Get the first urb in the urb list for this epid. We blatantly assume
+			   that only the first urb could have caused the epid attention.
+			   (For bulk and ctrl, only one urb is active at any one time. For intr
+			   and isoc we remove them once they are completed.) */
+			urb = urb_list_first(epid);
+
+			if (urb == NULL) {
+				err("Got epid_attn for epid %i with no urb.", epid);
+				err("R_USB_EPT_DATA = 0x%x", r_usb_ept_data);
+				err("R_USB_STATUS = 0x%x", reg->r_usb_status);
+				continue;
+			}
+
+			switch (usb_pipetype(urb->pipe)) {
+			case PIPE_BULK:
+				warn("Got epid attn for bulk endpoint, epid %d", epid);
+				break;
+			case PIPE_CONTROL:
+				warn("Got epid attn for control endpoint, epid %d", epid);
+				break;
+			case PIPE_INTERRUPT:
+				warn("Got epid attn for interrupt endpoint, epid %d", epid);
+				break;
+			case PIPE_ISOCHRONOUS:
+				warn("Got epid attn for isochronous endpoint, epid %d", epid);
+				break;
+			}
+
+			if (usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS) {
+				if (r_usb_ept_data & IO_MASK(R_USB_EPT_DATA, hold)) {
+					warn("Hold was set for epid %d.", epid);
+					continue;
+				}
+			}
+
+			/* Even though error_code occupies bits 22 - 23 in both R_USB_EPT_DATA and
+			   R_USB_EPT_DATA_ISOC, we separate them here so we don't forget in other places. */
+			if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
+				error_code = IO_EXTRACT(R_USB_EPT_DATA_ISO, error_code, r_usb_ept_data);
+			} else {
+				error_code = IO_EXTRACT(R_USB_EPT_DATA, error_code, r_usb_ept_data);
+			}
+
+			/* Using IO_STATE_VALUE on R_USB_EPT_DATA should be ok for isoc also. */
+			if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, no_error)) {
+
+				/* Isoc traffic doesn't have error_count_in/error_count_out. */
+				if ((usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS) &&
+				    (IO_EXTRACT(R_USB_EPT_DATA, error_count_in, r_usb_ept_data) == 3 ||
+				     IO_EXTRACT(R_USB_EPT_DATA, error_count_out, r_usb_ept_data) == 3)) {
+					/* 3rd error. */
+					warn("3rd error for epid %i", epid);
+					etrax_usb_complete_urb(urb, -EPROTO);
+
+				} else if (reg->r_usb_status & IO_MASK(R_USB_STATUS, perror)) {
+
+					warn("Perror for epid %d", epid);
+
+					if (!(r_usb_ept_data & IO_MASK(R_USB_EPT_DATA, valid))) {
+						/* invalid ep_id */
+						panic("Perror because of invalid epid."
+						      " Deconfigured too early?");
+					} else {
+						/* past eof1, near eof, zout transfer, setup transfer */
+
+						/* Dump the urb and the relevant EP descriptor list. */
+
+						__dump_urb(urb);
+						__dump_ept_data(epid);
+						__dump_ep_list(usb_pipetype(urb->pipe));
+
+						panic("Something wrong with DMA descriptor contents."
+						      " Too much traffic inserted?");
+					}
+				} else if (reg->r_usb_status & IO_MASK(R_USB_STATUS, ourun)) {
+					/* buffer ourun */
+					panic("Buffer overrun/underrun for epid %d. DMA too busy?", epid);
+				}
+
+			} else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, stall)) {
+				/* Not really a protocol error, just says that the endpoint gave
+				   a stall response. Note that error_code cannot be stall for isoc. */
+				if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
+					panic("Isoc traffic cannot stall");
+				}
+
+				warn("Stall for epid %d", epid);
+				etrax_usb_complete_urb(urb, -EPIPE);
+
+			} else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, bus_error)) {
+				/* Two devices responded to a transaction request. Must be resolved
+				   by software. FIXME: Reset ports? */
+				panic("Bus error for epid %d."
+				      " Two devices responded to transaction request",
+				      epid);
+
+			} else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, buffer_error)) {
+				/* DMA overrun or underrun. */
+				warn("Buffer overrun/underrun for epid %d. DMA too busy?", epid);
+
+				/* It seems that error_code = buffer_error in
+				   R_USB_EPT_DATA/R_USB_EPT_DATA_ISO and ourun = yes in R_USB_STATUS
+				   are the same error. */
+				etrax_usb_complete_urb(urb, -EPROTO);
+			}
+		}
+	}
+
+	DBFEXIT;
+
+}
+
+void etrax_usb_bulk_start_timer_func(unsigned long dummy)
+{
+
+	/* We might enable an EP descriptor behind the current DMA position when it's about
+	   to decide that there are no more bulk traffic and it should stop the bulk channel.
+	   Therefore we periodically check if the bulk channel is stopped and there is an
+	   enabled bulk EP descriptor, in which case we start the bulk channel. */
+	dbg_bulk("bulk_start_timer timed out.");
+
+	if (!(*R_DMA_CH8_SUB0_CMD & IO_MASK(R_DMA_CH8_SUB0_CMD, cmd))) {
+		int epid;
+
+		dbg_bulk("Bulk DMA channel not running.");
+
+		for (epid = 0; epid < NBR_OF_EPIDS; epid++) {
+			if (TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
+				dbg_bulk("Found enabled EP for epid %d, starting bulk channel.\n",
+					 epid);
+				*R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start);
+
+				/* Restart the bulk eot timer since we just started the bulk channel. */
+				mod_timer(&bulk_eot_timer, jiffies + BULK_EOT_TIMER_INTERVAL);
+
+				/* No need to search any further. */
+				break;
+			}
+		}
+	} else {
+		dbg_bulk("Bulk DMA channel running.");
+	}
+}
+
+void etrax_usb_hc_port_status_interrupt(usb_interrupt_registers_t *reg)
+{
+	etrax_hc_t *hc = reg->hc;
+	__u16 r_usb_rh_port_status_1 = reg->r_usb_rh_port_status_1;
+	__u16 r_usb_rh_port_status_2 = reg->r_usb_rh_port_status_2;
+
+	DBFENTER;
+
+	/* The Etrax RH does not include a wPortChange register, so this has to be handled in software
+	   (by saving the old port status value for comparison when the port status interrupt happens).
+	   See section 11.16.2.6.2 in the USB 1.1 spec for details. */
+
+	dbg_rh("hc->rh.prev_wPortStatus_1 = 0x%x", hc->rh.prev_wPortStatus_1);
+	dbg_rh("hc->rh.prev_wPortStatus_2 = 0x%x", hc->rh.prev_wPortStatus_2);
+	dbg_rh("r_usb_rh_port_status_1 = 0x%x", r_usb_rh_port_status_1);
+	dbg_rh("r_usb_rh_port_status_2 = 0x%x", r_usb_rh_port_status_2);
+
+	/* C_PORT_CONNECTION is set on any transition. */
+	hc->rh.wPortChange_1 |=
+		((r_usb_rh_port_status_1 & (1 << RH_PORT_CONNECTION)) !=
+		 (hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_CONNECTION))) ?
+		(1 << RH_PORT_CONNECTION) : 0;
+
+	hc->rh.wPortChange_2 |=
+		((r_usb_rh_port_status_2 & (1 << RH_PORT_CONNECTION)) !=
+		 (hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_CONNECTION))) ?
+		(1 << RH_PORT_CONNECTION) : 0;
+
+	/* C_PORT_ENABLE is _only_ set on a one to zero transition, i.e. when
+	   the port is disabled, not when it's enabled. */
+	hc->rh.wPortChange_1 |=
+		((hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_ENABLE))
+		 && !(r_usb_rh_port_status_1 & (1 << RH_PORT_ENABLE))) ?
+		(1 << RH_PORT_ENABLE) : 0;
+
+	hc->rh.wPortChange_2 |=
+		((hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_ENABLE))
+		 && !(r_usb_rh_port_status_2 & (1 << RH_PORT_ENABLE))) ?
+		(1 << RH_PORT_ENABLE) : 0;
+
+	/* C_PORT_SUSPEND is set to one when the device has transitioned out
+	   of the suspended state, i.e. when suspend goes from one to zero. */
+	hc->rh.wPortChange_1 |=
+		((hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_SUSPEND))
+		 && !(r_usb_rh_port_status_1 & (1 << RH_PORT_SUSPEND))) ?
+		(1 << RH_PORT_SUSPEND) : 0;
+
+	hc->rh.wPortChange_2 |=
+		((hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_SUSPEND))
+		 && !(r_usb_rh_port_status_2 & (1 << RH_PORT_SUSPEND))) ?
+		(1 << RH_PORT_SUSPEND) : 0;
+
+
+	/* C_PORT_RESET is set when reset processing on this port is complete. */
+	hc->rh.wPortChange_1 |=
+		((hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_RESET))
+		 && !(r_usb_rh_port_status_1 & (1 << RH_PORT_RESET))) ?
+		(1 << RH_PORT_RESET) : 0;
+
+	hc->rh.wPortChange_2 |=
+		((hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_RESET))
+		 && !(r_usb_rh_port_status_2 & (1 << RH_PORT_RESET))) ?
+		(1 << RH_PORT_RESET) : 0;
+
+	/* Save the new values for next port status change. */
+	hc->rh.prev_wPortStatus_1 = r_usb_rh_port_status_1;
+	hc->rh.prev_wPortStatus_2 = r_usb_rh_port_status_2;
+
+	dbg_rh("hc->rh.wPortChange_1 set to 0x%x", hc->rh.wPortChange_1);
+	dbg_rh("hc->rh.wPortChange_2 set to 0x%x", hc->rh.wPortChange_2);
+
+	DBFEXIT;
+
+}
+
+void etrax_usb_hc_ctl_status_interrupt(usb_interrupt_registers_t *reg)
+{
+	DBFENTER;
+
+	/* FIXME: What should we do if we get ourun or perror? Dump the EP and SB
+	   list for the corresponding epid? */
+	if (reg->r_usb_status & IO_MASK(R_USB_STATUS, ourun)) {
+		panic("USB controller got ourun.");
+	}
+	if (reg->r_usb_status & IO_MASK(R_USB_STATUS, perror)) {
+
+		/* Before, etrax_usb_do_intr_recover was called on this epid if it was
+		   an interrupt pipe. I don't see how re-enabling all EP descriptors
+		   will help if there was a programming error. */
+		panic("USB controller got perror.");
+	}
+
+	if (reg->r_usb_status & IO_MASK(R_USB_STATUS, device_mode)) {
+		/* We should never operate in device mode. */
+		panic("USB controller in device mode.");
+	}
+
+	/* These if-statements could probably be nested. */
+	if (reg->r_usb_status & IO_MASK(R_USB_STATUS, host_mode)) {
+		info("USB controller in host mode.");
+	}
+	if (reg->r_usb_status & IO_MASK(R_USB_STATUS, started)) {
+		info("USB controller started.");
+	}
+	if (reg->r_usb_status & IO_MASK(R_USB_STATUS, running)) {
+		info("USB controller running.");
+	}
+
+	DBFEXIT;
+
+}
+
+
+static int etrax_rh_submit_urb(struct urb *urb)
+{
+	struct usb_device *usb_dev = urb->dev;
+	etrax_hc_t *hc = usb_dev->bus->hcpriv;
+	unsigned int pipe = urb->pipe;
+	struct usb_ctrlrequest *cmd = (struct usb_ctrlrequest *) urb->setup_packet;
+	void *data = urb->transfer_buffer;
+	int leni = urb->transfer_buffer_length;
+	int len = 0;
+	int stat = 0;
+
+	__u16 bmRType_bReq;
+	__u16 wValue;
+	__u16 wIndex;
+	__u16 wLength;
+
+	DBFENTER;
+
+	/* FIXME: What is this interrupt urb that is sent to the root hub? */
+	if (usb_pipetype (pipe) == PIPE_INTERRUPT) {
+		dbg_rh("Root-Hub submit IRQ: every %d ms", urb->interval);
+		hc->rh.urb = urb;
+		hc->rh.send = 1;
+		/* FIXME: We could probably remove this line since it's done
+		   in etrax_rh_init_int_timer. (Don't remove it from
+		   etrax_rh_init_int_timer though.) */
+		hc->rh.interval = urb->interval;
+		etrax_rh_init_int_timer(urb);
+		DBFEXIT;
+
+		return 0;
+	}
+
+	bmRType_bReq = cmd->bRequestType | (cmd->bRequest << 8);
+	wValue = le16_to_cpu(cmd->wValue);
+	wIndex = le16_to_cpu(cmd->wIndex);
+	wLength = le16_to_cpu(cmd->wLength);
+
+	dbg_rh("bmRType_bReq : 0x%04x (%d)", bmRType_bReq, bmRType_bReq);
+	dbg_rh("wValue       : 0x%04x (%d)", wValue, wValue);
+	dbg_rh("wIndex       : 0x%04x (%d)", wIndex, wIndex);
+	dbg_rh("wLength      : 0x%04x (%d)", wLength, wLength);
+
+	switch (bmRType_bReq) {
+
+		/* Request Destination:
+		   without flags: Device,
+		   RH_INTERFACE: interface,
+		   RH_ENDPOINT: endpoint,
+		   RH_CLASS means HUB here,
+		   RH_OTHER | RH_CLASS  almost ever means HUB_PORT here
+		 */
+
+	case RH_GET_STATUS:
+		*(__u16 *) data = cpu_to_le16 (1);
+		OK (2);
+
+	case RH_GET_STATUS | RH_INTERFACE:
+		*(__u16 *) data = cpu_to_le16 (0);
+		OK (2);
+
+	case RH_GET_STATUS | RH_ENDPOINT:
+		*(__u16 *) data = cpu_to_le16 (0);
+		OK (2);
+
+	case RH_GET_STATUS | RH_CLASS:
+		*(__u32 *) data = cpu_to_le32 (0);
+		OK (4);		/* hub power ** */
+
+	case RH_GET_STATUS | RH_OTHER | RH_CLASS:
+		if (wIndex == 1) {
+			*((__u16*)data) = cpu_to_le16(hc->rh.prev_wPortStatus_1);
+			*((__u16*)data + 1) = cpu_to_le16(hc->rh.wPortChange_1);
+		} else if (wIndex == 2) {
+			*((__u16*)data) = cpu_to_le16(hc->rh.prev_wPortStatus_2);
+			*((__u16*)data + 1) = cpu_to_le16(hc->rh.wPortChange_2);
+		} else {
+			dbg_rh("RH_GET_STATUS whith invalid wIndex!");
+			OK(0);
+		}
+
+		OK(4);
+
+	case RH_CLEAR_FEATURE | RH_ENDPOINT:
+		switch (wValue) {
+		case (RH_ENDPOINT_STALL):
+			OK (0);
+		}
+		break;
+
+	case RH_CLEAR_FEATURE | RH_CLASS:
+		switch (wValue) {
+		case (RH_C_HUB_OVER_CURRENT):
+			OK (0);	/* hub power over current ** */
+		}
+		break;
+
+	case RH_CLEAR_FEATURE | RH_OTHER | RH_CLASS:
+		switch (wValue) {
+		case (RH_PORT_ENABLE):
+			if (wIndex == 1) {
+
+				dbg_rh("trying to do disable port 1");
+
+				*R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, yes);
+
+				while (hc->rh.prev_wPortStatus_1 &
+				       IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, yes));
+				*R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, no);
+				dbg_rh("Port 1 is disabled");
+
+			} else if (wIndex == 2) {
+
+				dbg_rh("trying to do disable port 2");
+
+				*R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, yes);
+
+				while (hc->rh.prev_wPortStatus_2 &
+				       IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, yes));
+				*R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, no);
+				dbg_rh("Port 2 is disabled");
+
+			} else {
+				dbg_rh("RH_CLEAR_FEATURE->RH_PORT_ENABLE "
+				       "with invalid wIndex == %d!", wIndex);
+			}
+
+			OK (0);
+		case (RH_PORT_SUSPEND):
+			/* Opposite to suspend should be resume, so we'll do a resume. */
+			/* FIXME: USB 1.1, 11.16.2.2 says:
+			   "Clearing the PORT_SUSPEND feature causes a host-initiated resume
+			   on the specified port. If the port is not in the Suspended state,
+			   the hub should treat this request as a functional no-operation."
+			   Shouldn't we check if the port is in a suspended state before
+			   resuming? */
+
+			/* Make sure the controller isn't busy. */
+			while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
+
+			if (wIndex == 1) {
+				*R_USB_COMMAND =
+					IO_STATE(R_USB_COMMAND, port_sel, port1) |
+					IO_STATE(R_USB_COMMAND, port_cmd, resume) |
+					IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
+			} else if (wIndex == 2) {
+				*R_USB_COMMAND =
+					IO_STATE(R_USB_COMMAND, port_sel, port2) |
+					IO_STATE(R_USB_COMMAND, port_cmd, resume) |
+					IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
+			} else {
+				dbg_rh("RH_CLEAR_FEATURE->RH_PORT_SUSPEND "
+				       "with invalid wIndex == %d!", wIndex);
+			}
+
+			OK (0);
+		case (RH_PORT_POWER):
+			OK (0);	/* port power ** */
+		case (RH_C_PORT_CONNECTION):
+			if (wIndex == 1) {
+				hc->rh.wPortChange_1 &= ~(1 << RH_PORT_CONNECTION);
+			} else if (wIndex == 2) {
+				hc->rh.wPortChange_2 &= ~(1 << RH_PORT_CONNECTION);
+			} else {
+				dbg_rh("RH_CLEAR_FEATURE->RH_C_PORT_CONNECTION "
+				       "with invalid wIndex == %d!", wIndex);
+			}
+
+			OK (0);
+		case (RH_C_PORT_ENABLE):
+			if (wIndex == 1) {
+				hc->rh.wPortChange_1 &= ~(1 << RH_PORT_ENABLE);
+			} else if (wIndex == 2) {
+				hc->rh.wPortChange_2 &= ~(1 << RH_PORT_ENABLE);
+			} else {
+				dbg_rh("RH_CLEAR_FEATURE->RH_C_PORT_ENABLE "
+				       "with invalid wIndex == %d!", wIndex);
+			}
+			OK (0);
+		case (RH_C_PORT_SUSPEND):
+/*** WR_RH_PORTSTAT(RH_PS_PSSC); */
+			OK (0);
+		case (RH_C_PORT_OVER_CURRENT):
+			OK (0);	/* port power over current ** */
+		case (RH_C_PORT_RESET):
+			if (wIndex == 1) {
+				hc->rh.wPortChange_1 &= ~(1 << RH_PORT_RESET);
+			} else if (wIndex == 2) {
+				hc->rh.wPortChange_2 &= ~(1 << RH_PORT_RESET);
+			} else {
+				dbg_rh("RH_CLEAR_FEATURE->RH_C_PORT_RESET "
+				       "with invalid index == %d!", wIndex);
+			}
+
+			OK (0);
+
+		}
+		break;
+
+	case RH_SET_FEATURE | RH_OTHER | RH_CLASS:
+		switch (wValue) {
+		case (RH_PORT_SUSPEND):
+
+			/* Make sure the controller isn't busy. */
+			while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
+
+			if (wIndex == 1) {
+				*R_USB_COMMAND =
+					IO_STATE(R_USB_COMMAND, port_sel, port1) |
+					IO_STATE(R_USB_COMMAND, port_cmd, suspend) |
+					IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
+			} else if (wIndex == 2) {
+				*R_USB_COMMAND =
+					IO_STATE(R_USB_COMMAND, port_sel, port2) |
+					IO_STATE(R_USB_COMMAND, port_cmd, suspend) |
+					IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
+			} else {
+				dbg_rh("RH_SET_FEATURE->RH_PORT_SUSPEND "
+				       "with invalid wIndex == %d!", wIndex);
+			}
+
+			OK (0);
+		case (RH_PORT_RESET):
+			if (wIndex == 1) {
+
+			port_1_reset:
+				dbg_rh("Doing reset of port 1");
+
+				/* Make sure the controller isn't busy. */
+				while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
+
+				*R_USB_COMMAND =
+					IO_STATE(R_USB_COMMAND, port_sel, port1) |
+					IO_STATE(R_USB_COMMAND, port_cmd, reset) |
+					IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
+
+				/* We must wait at least 10 ms for the device to recover.
+				   15 ms should be enough. */
+				udelay(15000);
+
+				/* Wait for reset bit to go low (should be done by now). */
+				while (hc->rh.prev_wPortStatus_1 &
+				       IO_STATE(R_USB_RH_PORT_STATUS_1, reset, yes));
+
+				/* If the port status is
+				   1) connected and enabled then there is a device and everything is fine
+				   2) neither connected nor enabled then there is no device, also fine
+				   3) connected and not enabled then we try again
+				   (Yes, there are other port status combinations besides these.) */
+
+				if ((hc->rh.prev_wPortStatus_1 &
+				     IO_STATE(R_USB_RH_PORT_STATUS_1, connected, yes)) &&
+				    (hc->rh.prev_wPortStatus_1 &
+				     IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, no))) {
+					dbg_rh("Connected device on port 1, but port not enabled?"
+					       " Trying reset again.");
+					goto port_2_reset;
+				}
+
+				/* Diagnostic printouts. */
+				if ((hc->rh.prev_wPortStatus_1 &
+				     IO_STATE(R_USB_RH_PORT_STATUS_1, connected, no)) &&
+				    (hc->rh.prev_wPortStatus_1 &
+				     IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, no))) {
+					dbg_rh("No connected device on port 1");
+				} else if ((hc->rh.prev_wPortStatus_1 &
+					    IO_STATE(R_USB_RH_PORT_STATUS_1, connected, yes)) &&
+					   (hc->rh.prev_wPortStatus_1 &
+					    IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, yes))) {
+					dbg_rh("Connected device on port 1, port 1 enabled");
+				}
+
+			} else if (wIndex == 2) {
+
+			port_2_reset:
+				dbg_rh("Doing reset of port 2");
+
+				/* Make sure the controller isn't busy. */
+				while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
+
+				/* Issue the reset command. */
+				*R_USB_COMMAND =
+					IO_STATE(R_USB_COMMAND, port_sel, port2) |
+					IO_STATE(R_USB_COMMAND, port_cmd, reset) |
+					IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
+
+				/* We must wait at least 10 ms for the device to recover.
+				   15 ms should be enough. */
+				udelay(15000);
+
+				/* Wait for reset bit to go low (should be done by now). */
+				while (hc->rh.prev_wPortStatus_2 &
+				       IO_STATE(R_USB_RH_PORT_STATUS_2, reset, yes));
+
+				/* If the port status is
+				   1) connected and enabled then there is a device and everything is fine
+				   2) neither connected nor enabled then there is no device, also fine
+				   3) connected and not enabled then we try again
+				   (Yes, there are other port status combinations besides these.) */
+
+				if ((hc->rh.prev_wPortStatus_2 &
+				     IO_STATE(R_USB_RH_PORT_STATUS_2, connected, yes)) &&
+				    (hc->rh.prev_wPortStatus_2 &
+				     IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, no))) {
+					dbg_rh("Connected device on port 2, but port not enabled?"
+					       " Trying reset again.");
+					goto port_2_reset;
+				}
+
+				/* Diagnostic printouts. */
+				if ((hc->rh.prev_wPortStatus_2 &
+				     IO_STATE(R_USB_RH_PORT_STATUS_2, connected, no)) &&
+				    (hc->rh.prev_wPortStatus_2 &
+				     IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, no))) {
+					dbg_rh("No connected device on port 2");
+				} else if ((hc->rh.prev_wPortStatus_2 &
+					    IO_STATE(R_USB_RH_PORT_STATUS_2, connected, yes)) &&
+					   (hc->rh.prev_wPortStatus_2 &
+					    IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, yes))) {
+					dbg_rh("Connected device on port 2, port 2 enabled");
+				}
+
+			} else {
+				dbg_rh("RH_SET_FEATURE->RH_PORT_RESET with invalid wIndex = %d", wIndex);
+			}
+
+			/* Make sure the controller isn't busy. */
+			while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
+
+			/* If all enabled ports were disabled the host controller goes down into
+			   started mode, so we need to bring it back into the running state.
+			   (This is safe even if it's already in the running state.) */
+			*R_USB_COMMAND =
+				IO_STATE(R_USB_COMMAND, port_sel, nop) |
+				IO_STATE(R_USB_COMMAND, port_cmd, reset) |
+				IO_STATE(R_USB_COMMAND, ctrl_cmd, host_run);
+
+			dbg_rh("...Done");
+			OK(0);
+
+		case (RH_PORT_POWER):
+			OK (0);	/* port power ** */
+		case (RH_PORT_ENABLE):
+			/* There is no port enable command in the host controller, so if the
+			   port is already enabled, we do nothing. If not, we reset the port
+			   (with an ugly goto). */
+
+			if (wIndex == 1) {
+				if (hc->rh.prev_wPortStatus_1 &
+				    IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, no)) {
+					goto port_1_reset;
+				}
+			} else if (wIndex == 2) {
+				if (hc->rh.prev_wPortStatus_2 &
+				    IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, no)) {
+					goto port_2_reset;
+				}
+			} else {
+				dbg_rh("RH_SET_FEATURE->RH_GET_STATUS with invalid wIndex = %d", wIndex);
+			}
+			OK (0);
+		}
+		break;
+
+	case RH_SET_ADDRESS:
+		hc->rh.devnum = wValue;
+		dbg_rh("RH address set to: %d", hc->rh.devnum);
+		OK (0);
+
+	case RH_GET_DESCRIPTOR:
+		switch ((wValue & 0xff00) >> 8) {
+		case (0x01):	/* device descriptor */
+			len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_dev_des), wLength));
+			memcpy (data, root_hub_dev_des, len);
+			OK (len);
+		case (0x02):	/* configuration descriptor */
+			len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_config_des), wLength));
+			memcpy (data, root_hub_config_des, len);
+			OK (len);
+		case (0x03):	/* string descriptors */
+			len = usb_root_hub_string (wValue & 0xff,
+						   0xff, "ETRAX 100LX",
+						   data, wLength);
+			if (len > 0) {
+				OK(min(leni, len));
+			} else {
+				stat = -EPIPE;
+			}
+
+		}
+		break;
+
+	case RH_GET_DESCRIPTOR | RH_CLASS:
+		root_hub_hub_des[2] = hc->rh.numports;
+		len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_hub_des), wLength));
+		memcpy (data, root_hub_hub_des, len);
+		OK (len);
+
+	case RH_GET_CONFIGURATION:
+		*(__u8 *) data = 0x01;
+		OK (1);
+
+	case RH_SET_CONFIGURATION:
+		OK (0);
+
+	default:
+		stat = -EPIPE;
+	}
+
+	urb->actual_length = len;
+	urb->status = stat;
+	urb->dev = NULL;
+	if (urb->complete) {
+		urb->complete(urb, NULL);
+	}
+	DBFEXIT;
+
+	return 0;
+}
+
+static void
+etrax_usb_bulk_eot_timer_func(unsigned long dummy)
+{
+	/* Because of a race condition in the top half, we might miss a bulk eot.
+	   This timer "simulates" a bulk eot if we don't get one for a while, hopefully
+	   correcting the situation. */
+	dbg_bulk("bulk_eot_timer timed out.");
+	etrax_usb_hc_bulk_eot_interrupt(1);
+}
+
+static void*
+etrax_usb_buffer_alloc(struct usb_bus* bus, size_t size,
+	unsigned mem_flags, dma_addr_t *dma)
+{
+  return kmalloc(size, mem_flags);
+}
+
+static void
+etrax_usb_buffer_free(struct usb_bus *bus, size_t size, void *addr, dma_addr_t dma)
+{
+  kfree(addr);
+}
+
+
+static struct device fake_device;
+
+static int __init etrax_usb_hc_init(void)
+{
+	static etrax_hc_t *hc;
+	struct usb_bus *bus;
+	struct usb_device *usb_rh;
+	int i;
+
+	DBFENTER;
+
+	info("ETRAX 100LX USB-HCD %s (c) 2001-2003 Axis Communications AB\n", usb_hcd_version);
+
+ 	hc = kmalloc(sizeof(etrax_hc_t), GFP_KERNEL);
+	assert(hc != NULL);
+
+	/* We use kmem_cache_* to make sure that all DMA desc. are dword aligned */
+	/* Note that we specify sizeof(USB_EP_Desc_t) as the size, but also allocate
+	   SB descriptors from this cache. This is ok since sizeof(USB_EP_Desc_t) ==
+	   sizeof(USB_SB_Desc_t). */
+
+	usb_desc_cache = kmem_cache_create("usb_desc_cache", sizeof(USB_EP_Desc_t), 0,
+					   SLAB_HWCACHE_ALIGN, 0, 0);
+	assert(usb_desc_cache != NULL);
+
+	top_half_reg_cache = kmem_cache_create("top_half_reg_cache",
+					       sizeof(usb_interrupt_registers_t),
+					       0, SLAB_HWCACHE_ALIGN, 0, 0);
+	assert(top_half_reg_cache != NULL);
+
+	isoc_compl_cache = kmem_cache_create("isoc_compl_cache",
+						sizeof(usb_isoc_complete_data_t),
+						0, SLAB_HWCACHE_ALIGN, 0, 0);
+	assert(isoc_compl_cache != NULL);
+
+	etrax_usb_bus = bus = usb_alloc_bus(&etrax_usb_device_operations);
+	hc->bus = bus;
+	bus->bus_name="ETRAX 100LX";
+	bus->hcpriv = hc;
+
+	/* Initialize RH to the default address.
+	   And make sure that we have no status change indication */
+	hc->rh.numports = 2;  /* The RH has two ports */
+	hc->rh.devnum = 1;
+	hc->rh.wPortChange_1 = 0;
+	hc->rh.wPortChange_2 = 0;
+
+	/* Also initate the previous values to zero */
+	hc->rh.prev_wPortStatus_1 = 0;
+	hc->rh.prev_wPortStatus_2 = 0;
+
+	/* Initialize the intr-traffic flags */
+	/* FIXME: This isn't used. (Besides, the error field isn't initialized.) */
+	hc->intr.sleeping = 0;
+	hc->intr.wq = NULL;
+
+	epid_usage_bitmask = 0;
+	epid_out_traffic = 0;
+
+	/* Mark the invalid epid as being used. */
+	set_bit(INVALID_EPID, (void *)&epid_usage_bitmask);
+	*R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, INVALID_EPID);
+	nop();
+	/* The valid bit should still be set ('invalid' is in our world; not the hardware's). */
+	*R_USB_EPT_DATA = (IO_STATE(R_USB_EPT_DATA, valid, yes) |
+			   IO_FIELD(R_USB_EPT_DATA, max_len, 1));
+
+	/* Mark the dummy epid as being used. */
+	set_bit(DUMMY_EPID, (void *)&epid_usage_bitmask);
+	*R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, DUMMY_EPID);
+	nop();
+	*R_USB_EPT_DATA = (IO_STATE(R_USB_EPT_DATA, valid, no) |
+			   IO_FIELD(R_USB_EPT_DATA, max_len, 1));
+
+	/* Initialize the urb list by initiating a head for each list. */
+	for (i = 0; i < NBR_OF_EPIDS; i++) {
+		INIT_LIST_HEAD(&urb_list[i]);
+	}
+	spin_lock_init(&urb_list_lock);
+
+	INIT_LIST_HEAD(&urb_unlink_list);
+
+
+	/* Initiate the bulk start timer. */
+	init_timer(&bulk_start_timer);
+	bulk_start_timer.expires = jiffies + BULK_START_TIMER_INTERVAL;
+	bulk_start_timer.function = etrax_usb_bulk_start_timer_func;
+	add_timer(&bulk_start_timer);
+
+
+	/* Initiate the bulk eot timer. */
+	init_timer(&bulk_eot_timer);
+	bulk_eot_timer.expires = jiffies + BULK_EOT_TIMER_INTERVAL;
+	bulk_eot_timer.function = etrax_usb_bulk_eot_timer_func;
+	add_timer(&bulk_eot_timer);
+
+	/* Set up the data structures for USB traffic. Note that this must be done before
+	   any interrupt that relies on sane DMA list occurrs. */
+	init_rx_buffers();
+	init_tx_bulk_ep();
+	init_tx_ctrl_ep();
+	init_tx_intr_ep();
+	init_tx_isoc_ep();
+
+        device_initialize(&fake_device);
+        kobject_set_name(&fake_device.kobj, "etrax_usb");
+        kobject_add(&fake_device.kobj);
+	kobject_uevent(&fake_device.kobj, KOBJ_ADD);
+        hc->bus->controller = &fake_device;
+	usb_register_bus(hc->bus);
+
+	*R_IRQ_MASK2_SET =
+		/* Note that these interrupts are not used. */
+		IO_STATE(R_IRQ_MASK2_SET, dma8_sub0_descr, set) |
+		/* Sub channel 1 (ctrl) descr. interrupts are used. */
+		IO_STATE(R_IRQ_MASK2_SET, dma8_sub1_descr, set) |
+		IO_STATE(R_IRQ_MASK2_SET, dma8_sub2_descr, set) |
+		/* Sub channel 3 (isoc) descr. interrupts are used. */
+		IO_STATE(R_IRQ_MASK2_SET, dma8_sub3_descr, set);
+
+	/* Note that the dma9_descr interrupt is not used. */
+	*R_IRQ_MASK2_SET =
+		IO_STATE(R_IRQ_MASK2_SET, dma9_eop, set) |
+		IO_STATE(R_IRQ_MASK2_SET, dma9_descr, set);
+
+	/* FIXME: Enable iso_eof only when isoc traffic is running. */
+	*R_USB_IRQ_MASK_SET =
+		IO_STATE(R_USB_IRQ_MASK_SET, iso_eof, set) |
+		IO_STATE(R_USB_IRQ_MASK_SET, bulk_eot, set) |
+		IO_STATE(R_USB_IRQ_MASK_SET, epid_attn, set) |
+		IO_STATE(R_USB_IRQ_MASK_SET, port_status, set) |
+		IO_STATE(R_USB_IRQ_MASK_SET, ctl_status, set);
+
+
+	if (request_irq(ETRAX_USB_HC_IRQ, etrax_usb_hc_interrupt_top_half, 0,
+			"ETRAX 100LX built-in USB (HC)", hc)) {
+		err("Could not allocate IRQ %d for USB", ETRAX_USB_HC_IRQ);
+		etrax_usb_hc_cleanup();
+		DBFEXIT;
+		return -1;
+	}
+
+	if (request_irq(ETRAX_USB_RX_IRQ, etrax_usb_rx_interrupt, 0,
+			"ETRAX 100LX built-in USB (Rx)", hc)) {
+		err("Could not allocate IRQ %d for USB", ETRAX_USB_RX_IRQ);
+		etrax_usb_hc_cleanup();
+		DBFEXIT;
+		return -1;
+	}
+
+	if (request_irq(ETRAX_USB_TX_IRQ, etrax_usb_tx_interrupt, 0,
+			"ETRAX 100LX built-in USB (Tx)", hc)) {
+		err("Could not allocate IRQ %d for USB", ETRAX_USB_TX_IRQ);
+		etrax_usb_hc_cleanup();
+		DBFEXIT;
+		return -1;
+	}
+
+	/* R_USB_COMMAND:
+	   USB commands in host mode. The fields in this register should all be
+	   written to in one write. Do not read-modify-write one field at a time. A
+	   write to this register will trigger events in the USB controller and an
+	   incomplete command may lead to unpredictable results, and in worst case
+	   even to a deadlock in the controller.
+	   (Note however that the busy field is read-only, so no need to write to it.) */
+
+	/* Check the busy bit before writing to R_USB_COMMAND. */
+
+	while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
+
+	/* Reset the USB interface. */
+	*R_USB_COMMAND =
+		IO_STATE(R_USB_COMMAND, port_sel, nop) |
+		IO_STATE(R_USB_COMMAND, port_cmd, reset) |
+		IO_STATE(R_USB_COMMAND, ctrl_cmd, reset);
+
+	/* Designer's Reference, p. 8 - 10 says we should Initate R_USB_FM_PSTART to 0x2A30 (10800),
+	   to guarantee that control traffic gets 10% of the bandwidth, and periodic transfer may
+	   allocate the rest (90%). This doesn't work though. Read on for a lenghty explanation.
+
+	   While there is a difference between rev. 2 and rev. 3 of the ETRAX 100LX regarding the NAK
+	   behaviour, it doesn't solve this problem. What happens is that a control transfer will not
+	   be interrupted in its data stage when PSTART happens (the point at which periodic traffic
+	   is started). Thus, if PSTART is set to 10800 and its IN or OUT token is NAKed until just before
+	   PSTART happens, it will continue the IN/OUT transfer as long as it's ACKed. After it's done,
+	   there may be too little time left for an isochronous transfer, causing an epid attention
+	   interrupt due to perror. The work-around for this is to let the control transfers run at the
+	   end of the frame instead of at the beginning, and will be interrupted just fine if it doesn't
+	   fit into the frame. However, since there will *always* be a control transfer at the beginning
+	   of the frame, regardless of what we set PSTART to, that transfer might be a 64-byte transfer
+	   which consumes up to 15% of the frame, leaving only 85% for periodic traffic. The solution to
+	   this would be to 'dummy allocate' 5% of the frame with the usb_claim_bandwidth function to make
+	   sure that the periodic transfers that are inserted will always fit in the frame.
+
+	   The idea was suggested that a control transfer could be split up into several 8 byte transfers,
+	   so that it would be interrupted by PSTART, but since this can't be done for an IN transfer this
+	   hasn't been implemented.
+
+	   The value 11960 is chosen to be just after the SOF token, with a couple of bit times extra
+	   for possible bit stuffing. */
+
+	*R_USB_FM_PSTART = IO_FIELD(R_USB_FM_PSTART, value, 11960);
+
+#ifdef CONFIG_ETRAX_USB_HOST_PORT1
+	*R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, no);
+#endif
+
+#ifdef CONFIG_ETRAX_USB_HOST_PORT2
+	*R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, no);
+#endif
+
+	while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
+
+	/* Configure the USB interface as a host controller. */
+	*R_USB_COMMAND =
+		IO_STATE(R_USB_COMMAND, port_sel, nop) |
+		IO_STATE(R_USB_COMMAND, port_cmd, reset) |
+		IO_STATE(R_USB_COMMAND, ctrl_cmd, host_config);
+
+	/* Note: Do not reset any ports here. Await the port status interrupts, to have a controlled
+	   sequence of resetting the ports. If we reset both ports now, and there are devices
+	   on both ports, we will get a bus error because both devices will answer the set address
+	   request. */
+
+	while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
+
+	/* Start processing of USB traffic. */
+	*R_USB_COMMAND =
+		IO_STATE(R_USB_COMMAND, port_sel, nop) |
+		IO_STATE(R_USB_COMMAND, port_cmd, reset) |
+		IO_STATE(R_USB_COMMAND, ctrl_cmd, host_run);
+
+	while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
+
+	usb_rh = usb_alloc_dev(NULL, hc->bus, 0);
+	hc->bus->root_hub = usb_rh;
+        usb_rh->state = USB_STATE_ADDRESS;
+        usb_rh->speed = USB_SPEED_FULL;
+        usb_rh->devnum = 1;
+        hc->bus->devnum_next = 2;
+        usb_rh->ep0.desc.wMaxPacketSize = __const_cpu_to_le16(64);
+        usb_get_device_descriptor(usb_rh, USB_DT_DEVICE_SIZE);
+	usb_new_device(usb_rh);
+
+	DBFEXIT;
+
+	return 0;
+}
+
+static void etrax_usb_hc_cleanup(void)
+{
+	DBFENTER;
+
+	free_irq(ETRAX_USB_HC_IRQ, NULL);
+	free_irq(ETRAX_USB_RX_IRQ, NULL);
+	free_irq(ETRAX_USB_TX_IRQ, NULL);
+
+	usb_deregister_bus(etrax_usb_bus);
+
+	/* FIXME: call kmem_cache_destroy here? */
+
+	DBFEXIT;
+}
+
+module_init(etrax_usb_hc_init);
+module_exit(etrax_usb_hc_cleanup);
diff --git a/target/linux/etrax/files/drivers/usb/host/hc_crisv10.h b/target/linux/etrax/files/drivers/usb/host/hc_crisv10.h
new file mode 100644
index 0000000..62f7711
--- /dev/null
+++ b/target/linux/etrax/files/drivers/usb/host/hc_crisv10.h
@@ -0,0 +1,289 @@
+#ifndef __LINUX_ETRAX_USB_H
+#define __LINUX_ETRAX_USB_H
+
+#include <linux/types.h>
+#include <linux/list.h>
+
+typedef struct USB_IN_Desc {
+	volatile __u16 sw_len;
+	volatile __u16 command;
+	volatile unsigned long next;
+	volatile unsigned long buf;
+	volatile __u16 hw_len;
+	volatile __u16 status;
+} USB_IN_Desc_t;
+
+typedef struct USB_SB_Desc {
+	volatile __u16 sw_len;
+	volatile __u16 command;
+	volatile unsigned long next;
+	volatile unsigned long buf;
+	__u32 dummy;
+} USB_SB_Desc_t;
+
+typedef struct USB_EP_Desc {
+	volatile __u16 hw_len;
+	volatile __u16 command;
+	volatile unsigned long sub;
+	volatile unsigned long next;
+	__u32 dummy;
+} USB_EP_Desc_t;
+
+struct virt_root_hub {
+	int devnum;
+	void *urb;
+	void *int_addr;
+	int send;
+	int interval;
+	int numports;
+	struct timer_list rh_int_timer;
+	volatile __u16 wPortChange_1;
+	volatile __u16 wPortChange_2;
+	volatile __u16 prev_wPortStatus_1;
+	volatile __u16 prev_wPortStatus_2;
+};
+
+struct etrax_usb_intr_traffic {
+	int sleeping;
+	int error;
+	struct wait_queue *wq;
+};
+
+typedef struct etrax_usb_hc {
+	struct usb_bus *bus;
+	struct virt_root_hub rh;
+	struct etrax_usb_intr_traffic intr;
+} etrax_hc_t;
+
+typedef enum {
+	STARTED,
+	NOT_STARTED,
+	UNLINK,
+	TRANSFER_DONE,
+	WAITING_FOR_DESCR_INTR
+} etrax_usb_urb_state_t;
+
+
+
+typedef struct etrax_usb_urb_priv {
+	/* The first_sb field is used for freeing all SB descriptors belonging
+	   to an urb. The corresponding ep descriptor's sub pointer cannot be
+	   used for this since the DMA advances the sub pointer as it processes
+	   the sb list. */
+	USB_SB_Desc_t *first_sb;
+	/* The last_sb field referes to the last SB descriptor that belongs to
+	   this urb. This is important to know so we can free the SB descriptors
+	   that ranges between first_sb and last_sb. */
+	USB_SB_Desc_t *last_sb;
+
+	/* The rx_offset field is used in ctrl and bulk traffic to keep track
+	   of the offset in the urb's transfer_buffer where incoming data should be
+	   copied to. */
+	__u32 rx_offset;
+
+	/* Counter used in isochronous transfers to keep track of the
+	   number of packets received/transmitted.  */
+	__u32 isoc_packet_counter;
+
+	/* This field is used to pass information about the urb's current state between
+	   the various interrupt handlers (thus marked volatile). */
+	volatile etrax_usb_urb_state_t urb_state;
+
+	/* Connection between the submitted urb and ETRAX epid number */
+	__u8 epid;
+
+	/* The rx_data_list field is used for periodic traffic, to hold
+	   received data for later processing in the the complete_urb functions,
+	   where the data us copied to the urb's transfer_buffer. Basically, we
+	   use this intermediate storage because we don't know when it's safe to
+	   reuse the transfer_buffer (FIXME?). */
+	struct list_head rx_data_list;
+} etrax_urb_priv_t;
+
+/* This struct is for passing data from the top half to the bottom half. */
+typedef struct usb_interrupt_registers
+{
+	etrax_hc_t *hc;
+	__u32 r_usb_epid_attn;
+	__u8 r_usb_status;
+	__u16 r_usb_rh_port_status_1;
+	__u16 r_usb_rh_port_status_2;
+	__u32 r_usb_irq_mask_read;
+	__u32 r_usb_fm_number;
+	struct work_struct usb_bh;
+} usb_interrupt_registers_t;
+
+/* This struct is for passing data from the isoc top half to the isoc bottom half. */
+typedef struct usb_isoc_complete_data
+{
+	struct urb *urb;
+	struct work_struct usb_bh;
+} usb_isoc_complete_data_t;
+
+/* This struct holds data we get from the rx descriptors for DMA channel 9
+   for periodic traffic (intr and isoc). */
+typedef struct rx_data
+{
+	void *data;
+	int length;
+	struct list_head list;
+} rx_data_t;
+
+typedef struct urb_entry
+{
+	struct urb *urb;
+	struct list_head list;
+} urb_entry_t;
+
+/* ---------------------------------------------------------------------------
+   Virtual Root HUB
+   ------------------------------------------------------------------------- */
+/* destination of request */
+#define RH_INTERFACE               0x01
+#define RH_ENDPOINT                0x02
+#define RH_OTHER                   0x03
+
+#define RH_CLASS                   0x20
+#define RH_VENDOR                  0x40
+
+/* Requests: bRequest << 8 | bmRequestType */
+#define RH_GET_STATUS           0x0080
+#define RH_CLEAR_FEATURE        0x0100
+#define RH_SET_FEATURE          0x0300
+#define RH_SET_ADDRESS		0x0500
+#define RH_GET_DESCRIPTOR	0x0680
+#define RH_SET_DESCRIPTOR       0x0700
+#define RH_GET_CONFIGURATION	0x0880
+#define RH_SET_CONFIGURATION	0x0900
+#define RH_GET_STATE            0x0280
+#define RH_GET_INTERFACE        0x0A80
+#define RH_SET_INTERFACE        0x0B00
+#define RH_SYNC_FRAME           0x0C80
+/* Our Vendor Specific Request */
+#define RH_SET_EP               0x2000
+
+
+/* Hub port features */
+#define RH_PORT_CONNECTION         0x00
+#define RH_PORT_ENABLE             0x01
+#define RH_PORT_SUSPEND            0x02
+#define RH_PORT_OVER_CURRENT       0x03
+#define RH_PORT_RESET              0x04
+#define RH_PORT_POWER              0x08
+#define RH_PORT_LOW_SPEED          0x09
+#define RH_C_PORT_CONNECTION       0x10
+#define RH_C_PORT_ENABLE           0x11
+#define RH_C_PORT_SUSPEND          0x12
+#define RH_C_PORT_OVER_CURRENT     0x13
+#define RH_C_PORT_RESET            0x14
+
+/* Hub features */
+#define RH_C_HUB_LOCAL_POWER       0x00
+#define RH_C_HUB_OVER_CURRENT      0x01
+
+#define RH_DEVICE_REMOTE_WAKEUP    0x00
+#define RH_ENDPOINT_STALL          0x01
+
+/* Our Vendor Specific feature */
+#define RH_REMOVE_EP               0x00
+
+
+#define RH_ACK                     0x01
+#define RH_REQ_ERR                 -1
+#define RH_NACK                    0x00
+
+/* Field definitions for */
+
+#define USB_IN_command__eol__BITNR      0 /* command macros */
+#define USB_IN_command__eol__WIDTH      1
+#define USB_IN_command__eol__no         0
+#define USB_IN_command__eol__yes        1
+
+#define USB_IN_command__intr__BITNR     3
+#define USB_IN_command__intr__WIDTH     1
+#define USB_IN_command__intr__no        0
+#define USB_IN_command__intr__yes       1
+
+#define USB_IN_status__eop__BITNR       1 /* status macros. */
+#define USB_IN_status__eop__WIDTH       1
+#define USB_IN_status__eop__no          0
+#define USB_IN_status__eop__yes         1
+
+#define USB_IN_status__eot__BITNR       5
+#define USB_IN_status__eot__WIDTH       1
+#define USB_IN_status__eot__no          0
+#define USB_IN_status__eot__yes         1
+
+#define USB_IN_status__error__BITNR     6
+#define USB_IN_status__error__WIDTH     1
+#define USB_IN_status__error__no        0
+#define USB_IN_status__error__yes       1
+
+#define USB_IN_status__nodata__BITNR    7
+#define USB_IN_status__nodata__WIDTH    1
+#define USB_IN_status__nodata__no       0
+#define USB_IN_status__nodata__yes      1
+
+#define USB_IN_status__epid__BITNR      8
+#define USB_IN_status__epid__WIDTH      5
+
+#define USB_EP_command__eol__BITNR      0
+#define USB_EP_command__eol__WIDTH      1
+#define USB_EP_command__eol__no         0
+#define USB_EP_command__eol__yes        1
+
+#define USB_EP_command__eof__BITNR      1
+#define USB_EP_command__eof__WIDTH      1
+#define USB_EP_command__eof__no         0
+#define USB_EP_command__eof__yes        1
+
+#define USB_EP_command__intr__BITNR     3
+#define USB_EP_command__intr__WIDTH     1
+#define USB_EP_command__intr__no        0
+#define USB_EP_command__intr__yes       1
+
+#define USB_EP_command__enable__BITNR   4
+#define USB_EP_command__enable__WIDTH   1
+#define USB_EP_command__enable__no      0
+#define USB_EP_command__enable__yes     1
+
+#define USB_EP_command__hw_valid__BITNR 5
+#define USB_EP_command__hw_valid__WIDTH 1
+#define USB_EP_command__hw_valid__no    0
+#define USB_EP_command__hw_valid__yes   1
+
+#define USB_EP_command__epid__BITNR     8
+#define USB_EP_command__epid__WIDTH     5
+
+#define USB_SB_command__eol__BITNR      0 /* command macros. */
+#define USB_SB_command__eol__WIDTH      1
+#define USB_SB_command__eol__no         0
+#define USB_SB_command__eol__yes        1
+
+#define USB_SB_command__eot__BITNR      1
+#define USB_SB_command__eot__WIDTH      1
+#define USB_SB_command__eot__no         0
+#define USB_SB_command__eot__yes        1
+
+#define USB_SB_command__intr__BITNR     3
+#define USB_SB_command__intr__WIDTH     1
+#define USB_SB_command__intr__no        0
+#define USB_SB_command__intr__yes       1
+
+#define USB_SB_command__tt__BITNR       4
+#define USB_SB_command__tt__WIDTH       2
+#define USB_SB_command__tt__zout        0
+#define USB_SB_command__tt__in          1
+#define USB_SB_command__tt__out         2
+#define USB_SB_command__tt__setup       3
+
+
+#define USB_SB_command__rem__BITNR      8
+#define USB_SB_command__rem__WIDTH      6
+
+#define USB_SB_command__full__BITNR     6
+#define USB_SB_command__full__WIDTH     1
+#define USB_SB_command__full__no        0
+#define USB_SB_command__full__yes       1
+
+#endif
diff --git a/target/linux/etrax/patches/301-usb_support.patch b/target/linux/etrax/patches/301-usb_support.patch
new file mode 100644
index 0000000..3bc9f23
--- /dev/null
+++ b/target/linux/etrax/patches/301-usb_support.patch
@@ -0,0 +1,22 @@
+Index: linux-2.6.25.1/drivers/usb/Makefile
+===================================================================
+--- linux-2.6.25.1.orig/drivers/usb/Makefile	2008-05-03 21:33:11.000000000 +0100
++++ linux-2.6.25.1/drivers/usb/Makefile	2008-05-03 21:33:17.000000000 +0100
+@@ -16,6 +16,7 @@
+ obj-$(CONFIG_USB_SL811_HCD)	+= host/
+ obj-$(CONFIG_USB_U132_HCD)	+= host/
+ obj-$(CONFIG_USB_R8A66597_HCD)	+= host/
++obj-$(CONFIG_ETRAX_USB_HOST)   += host/
+ 
+ obj-$(CONFIG_USB_ACM)		+= class/
+ obj-$(CONFIG_USB_PRINTER)	+= class/
+Index: linux-2.6.25.1/drivers/usb/host/Makefile
+===================================================================
+--- linux-2.6.25.1.orig/drivers/usb/host/Makefile	2008-05-03 21:33:24.000000000 +0100
++++ linux-2.6.25.1/drivers/usb/host/Makefile	2008-05-03 21:33:47.000000000 +0100
+@@ -16,4 +16,4 @@
+ obj-$(CONFIG_USB_SL811_CS)	+= sl811_cs.o
+ obj-$(CONFIG_USB_U132_HCD)	+= u132-hcd.o
+ obj-$(CONFIG_USB_R8A66597_HCD)	+= r8a66597-hcd.o
+-
++obj-$(CONFIG_ETRAX_ARCH_V10)      += hc_crisv10.o