[etrax]: ...and probably claudio forgot to rename this directory, too :)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19655 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 4960 insertions, 0 deletions

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 000000000..817e19e50
--- /dev/null
+++ b/target/linux/etrax/files/drivers/usb/host/hc-crisv10.c
@@ -0,0 +1,4960 @@
+/*
+ *
+ * ETRAX 100LX USB Host Controller Driver
+ *
+ * Copyright (C) 2005 - 2008  Axis Communications AB
+ *
+ * Author: Konrad Eriksson <konrad.eriksson@axis.se>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+#include <linux/spinlock.h>
+#include <linux/usb.h>
+#include <linux/platform_device.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/arch/dma.h>
+#include <asm/arch/io_interface_mux.h>
+
+#include "../core/hcd.h"
+#include "../core/hub.h"
+#include "hc-crisv10.h"
+#include "hc-cris-dbg.h"
+
+
+/***************************************************************************/
+/***************************************************************************/
+/* Host Controller settings                                                */
+/***************************************************************************/
+/***************************************************************************/
+
+#define VERSION			"1.00-openwrt_diff"
+#define COPYRIGHT		"(c) 2005, 2006 Axis Communications AB"
+#define DESCRIPTION             "ETRAX 100LX USB Host Controller"
+
+#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
+
+/* Number of physical ports in Etrax 100LX */
+#define USB_ROOT_HUB_PORTS 2
+
+const char hc_name[] = "hc-crisv10";
+const char product_desc[] = DESCRIPTION;
+
+/* 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
+
+/* Module settings */
+
+MODULE_DESCRIPTION(DESCRIPTION);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Konrad Eriksson <konrad.eriksson@axis.se>");
+
+
+/* Module parameters */
+
+/* 0 = No ports enabled
+   1 = Only port 1 enabled (on board ethernet on devboard)
+   2 = Only port 2 enabled (external connector on devboard)
+   3 = Both ports enabled
+*/
+static unsigned int ports = 3;
+module_param(ports, uint, S_IRUGO);
+MODULE_PARM_DESC(ports, "Bitmask indicating USB ports to use");
+
+
+/***************************************************************************/
+/***************************************************************************/
+/* Shared global variables for this module                                 */
+/***************************************************************************/
+/***************************************************************************/
+
+/* EP descriptor lists for non period transfers. Must be 32-bit aligned. */
+static volatile struct USB_EP_Desc TxBulkEPList[NBR_OF_EPIDS] __attribute__ ((aligned (4)));
+
+static volatile struct USB_EP_Desc TxCtrlEPList[NBR_OF_EPIDS] __attribute__ ((aligned (4)));
+
+/* EP descriptor lists for period transfers. Must be 32-bit aligned. */
+static volatile struct USB_EP_Desc TxIntrEPList[MAX_INTR_INTERVAL] __attribute__ ((aligned (4)));
+static volatile struct USB_SB_Desc TxIntrSB_zout __attribute__ ((aligned (4)));
+
+static volatile struct USB_EP_Desc TxIsocEPList[NBR_OF_EPIDS] __attribute__ ((aligned (4)));
+static volatile struct USB_SB_Desc TxIsocSB_zout __attribute__ ((aligned (4)));
+
+static volatile struct USB_SB_Desc TxIsocSBList[NBR_OF_EPIDS] __attribute__ ((aligned (4))); 
+
+/* After each enabled bulk EP IN 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 struct USB_EP_Desc TxBulkDummyEPList[NBR_OF_EPIDS][2] __attribute__ ((aligned (4)));
+
+/* List of URB pointers, where each points to the active URB for a epid.
+   For Bulk, Ctrl and Intr this means which URB that currently is added to
+   DMA lists (Isoc URBs are all directly added to DMA lists). As soon as
+   URB has completed is the queue examined and the first URB in queue is
+   removed and moved to the activeUrbList while its state change to STARTED and
+   its transfer(s) gets added to DMA list (exception Isoc where URBs enter
+   state STARTED directly and added transfers added to DMA lists). */
+static struct urb *activeUrbList[NBR_OF_EPIDS];
+
+/* Additional software state info for each epid */
+static struct etrax_epid epid_state[NBR_OF_EPIDS];
+
+/* Timer handles for bulk traffic timer used to avoid DMA bug where DMA stops
+   even if there is new data waiting to be processed */
+static struct timer_list bulk_start_timer = TIMER_INITIALIZER(NULL, 0, 0);
+static struct timer_list bulk_eot_timer = TIMER_INITIALIZER(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/50) /* 20 ms */
+#define BULK_EOT_TIMER_INTERVAL (HZ/16) /* 60 ms */
+
+/* Delay before a URB completion happen when it's scheduled to be delayed */
+#define LATER_TIMER_DELAY (HZ/50) /* 20 ms */
+
+/* Simplifying macros for checking software state info of a epid */
+/* ----------------------------------------------------------------------- */
+#define epid_inuse(epid)       epid_state[epid].inuse
+#define epid_out_traffic(epid) epid_state[epid].out_traffic
+#define epid_isoc(epid)   (epid_state[epid].type == PIPE_ISOCHRONOUS ? 1 : 0)
+#define epid_intr(epid)   (epid_state[epid].type == PIPE_INTERRUPT ? 1 : 0)
+
+
+/***************************************************************************/
+/***************************************************************************/
+/* DEBUG FUNCTIONS                                                         */
+/***************************************************************************/
+/***************************************************************************/
+/* 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)
+{
+  struct crisv10_urb_priv *urb_priv = purb->hcpriv;
+  int urb_num = -1;
+  if(urb_priv) {
+    urb_num = urb_priv->urb_num;
+  }
+  printk("\nURB:0x%x[%d]\n", (unsigned int)purb, urb_num);
+  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 struct USB_IN_Desc *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 struct USB_SB_Desc *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(" USB_SB_Desc at 0x%08lx ", (unsigned long)sb);
+  printk(" command:0x%04x (", sb->command);
+  printk("rem:%d ", (sb->command & 0x3f00) >> 8);
+  printk("full:%d ", (sb->command & 0x40) >> 6);
+  printk("tt:%d(%s) ", tt, tt_string);
+  printk("intr:%d ", (sb->command & 0x8) >> 3);
+  printk("eot:%d ", (sb->command & 0x2) >> 1);
+  printk("eol:%d)", sb->command & 0x1);
+  printk(" sw_len:0x%04x(%d)", sb->sw_len, sb->sw_len);
+  printk(" next:0x%08lx", sb->next);
+  printk(" buf:0x%08lx\n", sb->buf);
+}
+
+
+static void __dump_ep_desc(volatile struct USB_EP_Desc *ep)
+{
+  printk("USB_EP_Desc at 0x%08lx ", (unsigned long)ep);
+  printk(" command:0x%04x (", ep->command);
+  printk("ep_id:%d ", (ep->command & 0x1f00) >> 8);
+  printk("enable:%d ", (ep->command & 0x10) >> 4);
+  printk("intr:%d ", (ep->command & 0x8) >> 3);
+  printk("eof:%d ", (ep->command & 0x2) >> 1);
+  printk("eol:%d)", ep->command & 0x1);
+  printk(" hw_len:0x%04x(%d)", ep->hw_len, ep->hw_len);
+  printk(" next:0x%08lx", ep->next);
+  printk(" sub:0x%08lx\n", ep->sub);
+}
+
+static inline void __dump_ep_list(int pipe_type)
+{
+  volatile struct USB_EP_Desc *ep;
+  volatile struct USB_EP_Desc *first_ep;
+  volatile struct USB_SB_Desc *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:
+      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 struct USB_EP_Desc *)(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;
+  }
+
+  local_irq_save(flags);
+  *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
+  nop();
+  r_usb_ept_data = *R_USB_EPT_DATA;
+  local_irq_restore(flags);
+
+  printk(" R_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_iso(int epid)
+{
+  unsigned long flags;
+  __u32 ept_data;
+
+  if (epid < 0 || epid > 31) {
+    printk("Cannot dump ept data for invalid epid %d\n", epid);
+    return;
+  }
+
+  local_irq_save(flags);
+  *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
+  nop();
+  ept_data = *R_USB_EPT_DATA_ISO;
+  local_irq_restore(flags);
+
+  printk(" R_USB_EPT_DATA = 0x%x for epid %d :\n", ept_data, epid);
+  if (ept_data == 0) {
+    /* No need for more detailed printing. */
+    return;
+  }
+  printk("  valid           : %d\n", IO_EXTRACT(R_USB_EPT_DATA_ISO, valid,
+						ept_data));
+  printk("  port            : %d\n", IO_EXTRACT(R_USB_EPT_DATA_ISO, port,
+						ept_data));
+  printk("  error_code      : %d\n", IO_EXTRACT(R_USB_EPT_DATA_ISO, error_code,
+						ept_data));
+  printk("  max_len         : %d\n", IO_EXTRACT(R_USB_EPT_DATA_ISO, max_len,
+						ept_data));
+  printk("  ep              : %d\n", IO_EXTRACT(R_USB_EPT_DATA_ISO, ep,
+						ept_data));
+  printk("  dev             : %d\n", IO_EXTRACT(R_USB_EPT_DATA_ISO, dev,
+						ept_data));
+}
+
+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);
+  }
+}
+
+static void debug_epid(int epid) {
+  int i;
+  
+  if(epid_isoc(epid)) {
+    __dump_ept_data_iso(epid);
+  } else {
+    __dump_ept_data(epid);
+  }
+
+  printk("Bulk:\n");
+  for(i = 0; i < 32; i++) {
+    if(IO_EXTRACT(USB_EP_command, epid, TxBulkEPList[i].command) ==
+       epid) {
+      printk("%d: ", i); __dump_ep_desc(&(TxBulkEPList[i]));
+    }
+  }
+
+  printk("Ctrl:\n");
+  for(i = 0; i < 32; i++) {
+    if(IO_EXTRACT(USB_EP_command, epid, TxCtrlEPList[i].command) ==
+       epid) {
+      printk("%d: ", i); __dump_ep_desc(&(TxCtrlEPList[i]));
+    }
+  }
+
+  printk("Intr:\n");
+  for(i = 0; i < MAX_INTR_INTERVAL; i++) {
+    if(IO_EXTRACT(USB_EP_command, epid, TxIntrEPList[i].command) ==
+       epid) {
+      printk("%d: ", i); __dump_ep_desc(&(TxIntrEPList[i]));
+    }
+  }
+  
+  printk("Isoc:\n");
+  for(i = 0; i < 32; i++) {
+    if(IO_EXTRACT(USB_EP_command, epid, TxIsocEPList[i].command) ==
+       epid) {
+      printk("%d: ", i); __dump_ep_desc(&(TxIsocEPList[i]));
+    }
+  }
+
+  __dump_ept_data_list();
+  __dump_ep_list(PIPE_INTERRUPT);
+  printk("\n\n");
+}
+
+
+
+char* hcd_status_to_str(__u8 bUsbStatus) {
+  static char hcd_status_str[128];
+  hcd_status_str[0] = '\0';
+  if(bUsbStatus & IO_STATE(R_USB_STATUS, ourun, yes)) {
+    strcat(hcd_status_str, "ourun ");
+  }
+  if(bUsbStatus & IO_STATE(R_USB_STATUS, perror, yes)) {
+    strcat(hcd_status_str, "perror ");
+  }
+  if(bUsbStatus & IO_STATE(R_USB_STATUS, device_mode, yes)) {
+    strcat(hcd_status_str, "device_mode ");
+  }
+  if(bUsbStatus & IO_STATE(R_USB_STATUS, host_mode, yes)) {
+    strcat(hcd_status_str, "host_mode ");
+  }
+  if(bUsbStatus & IO_STATE(R_USB_STATUS, started, yes)) {
+    strcat(hcd_status_str, "started ");
+  }
+  if(bUsbStatus & IO_STATE(R_USB_STATUS, running, yes)) {
+    strcat(hcd_status_str, "running ");
+  }
+  return hcd_status_str;
+}
+
+
+char* sblist_to_str(struct USB_SB_Desc* sb_desc) {
+  static char sblist_to_str_buff[128];
+  char tmp[32], tmp2[32];
+  sblist_to_str_buff[0] = '\0';
+  while(sb_desc != NULL) {
+    switch(IO_EXTRACT(USB_SB_command, tt, sb_desc->command)) {
+    case 0: sprintf(tmp, "zout");  break;
+    case 1: sprintf(tmp, "in");    break;
+    case 2: sprintf(tmp, "out");   break;
+    case 3: sprintf(tmp, "setup"); break;
+    }
+    sprintf(tmp2, "(%s %d)", tmp, sb_desc->sw_len);
+    strcat(sblist_to_str_buff, tmp2);
+    if(sb_desc->next != 0) {
+      sb_desc = phys_to_virt(sb_desc->next);
+    } else {
+      sb_desc = NULL;
+    }
+  }
+  return sblist_to_str_buff;
+}
+
+char* port_status_to_str(__u16 wPortStatus) {
+  static char port_status_str[128];
+  port_status_str[0] = '\0';
+  if(wPortStatus & IO_STATE(R_USB_RH_PORT_STATUS_1, connected, yes)) {
+    strcat(port_status_str, "connected ");
+  }
+  if(wPortStatus & IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, yes)) {
+    strcat(port_status_str, "enabled ");
+  }
+  if(wPortStatus & IO_STATE(R_USB_RH_PORT_STATUS_1, suspended, yes)) {
+    strcat(port_status_str, "suspended ");
+  }
+  if(wPortStatus & IO_STATE(R_USB_RH_PORT_STATUS_1, reset, yes)) {
+    strcat(port_status_str, "reset ");
+  }
+  if(wPortStatus & IO_STATE(R_USB_RH_PORT_STATUS_1, speed, full)) {
+    strcat(port_status_str, "full-speed ");
+  } else {
+    strcat(port_status_str, "low-speed ");
+  }
+  return port_status_str;
+}
+
+
+char* endpoint_to_str(struct usb_endpoint_descriptor *ed) {
+  static char endpoint_to_str_buff[128];
+  char tmp[32];
+  int epnum = ed->bEndpointAddress & 0x0F;
+  int dir = ed->bEndpointAddress & 0x80;
+  int type = ed->bmAttributes & 0x03;
+  endpoint_to_str_buff[0] = '\0';
+  sprintf(endpoint_to_str_buff, "ep:%d ", epnum);
+  switch(type) {
+  case 0:
+    sprintf(tmp, " ctrl");
+    break;
+  case 1:
+    sprintf(tmp, " isoc");
+    break;
+  case 2:
+    sprintf(tmp, " bulk");
+    break;
+  case 3:
+    sprintf(tmp, " intr");
+    break;
+  }
+  strcat(endpoint_to_str_buff, tmp);
+  if(dir) {
+    sprintf(tmp, " in");
+  } else {
+    sprintf(tmp, " out");
+  }
+  strcat(endpoint_to_str_buff, tmp);
+
+  return endpoint_to_str_buff;
+}
+
+/* Debug helper functions for Transfer Controller */
+char* pipe_to_str(unsigned int pipe) {
+  static char pipe_to_str_buff[128];
+  char tmp[64];
+  sprintf(pipe_to_str_buff, "dir:%s", str_dir(pipe));
+  sprintf(tmp, " type:%s", str_type(pipe));
+  strcat(pipe_to_str_buff, tmp);
+
+  sprintf(tmp, " dev:%d", usb_pipedevice(pipe));
+  strcat(pipe_to_str_buff, tmp);
+  sprintf(tmp, " ep:%d", usb_pipeendpoint(pipe));
+  strcat(pipe_to_str_buff, tmp);
+  return pipe_to_str_buff;
+}
+
+
+#define USB_DEBUG_DESC 1
+
+#ifdef USB_DEBUG_DESC
+#define dump_in_desc(x) __dump_in_desc(x)
+#define dump_sb_desc(...) __dump_sb_desc(...)
+#define dump_ep_desc(x) __dump_ep_desc(x)
+#define dump_ept_data(x) __dump_ept_data(x)
+#else
+#define dump_in_desc(...) do {} while (0)
+#define dump_sb_desc(...) do {} while (0)
+#define dump_ep_desc(...) do {} while (0)
+#endif
+
+
+/* Uncomment this to enable massive function call trace
+   #define USB_DEBUG_TRACE */
+
+#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 CHECK_ALIGN(x) if (((__u32)(x)) & 0x00000003) \
+{panic("Alignment check (DWORD) failed at %s:%s:%d\n", __FILE__, __FUNCTION__, __LINE__);}
+
+/* Most helpful debugging aid */
+#define ASSERT(expr) ((void) ((expr) ? 0 : (err("assert failed at: %s %d",__FUNCTION__, __LINE__))))
+
+
+/***************************************************************************/
+/***************************************************************************/
+/* Forward declarations                                                    */
+/***************************************************************************/
+/***************************************************************************/
+void crisv10_hcd_epid_attn_irq(struct crisv10_irq_reg *reg);
+void crisv10_hcd_port_status_irq(struct crisv10_irq_reg *reg);
+void crisv10_hcd_ctl_status_irq(struct crisv10_irq_reg *reg);
+void crisv10_hcd_isoc_eof_irq(struct crisv10_irq_reg *reg);
+
+void rh_port_status_change(__u16[]);
+int  rh_clear_port_feature(__u8, __u16);
+int  rh_set_port_feature(__u8, __u16);
+static void rh_disable_port(unsigned int port);
+
+static void check_finished_bulk_tx_epids(struct usb_hcd *hcd,
+					 int timer);
+
+static int  tc_setup_epid(struct usb_host_endpoint *ep, struct urb *urb,
+			 int mem_flags);
+static void tc_free_epid(struct usb_host_endpoint *ep);
+static int  tc_allocate_epid(void);
+static void tc_finish_urb(struct usb_hcd *hcd, struct urb *urb, int status);
+static void tc_finish_urb_later(struct usb_hcd *hcd, struct urb *urb,
+				int status);
+
+static int  urb_priv_create(struct usb_hcd *hcd, struct urb *urb, int epid,
+			   int mem_flags);
+static void urb_priv_free(struct usb_hcd *hcd, struct urb *urb);
+
+static int crisv10_usb_check_bandwidth(struct usb_device *dev,struct urb *urb);
+static void crisv10_usb_claim_bandwidth(
+	struct usb_device *dev, struct urb *urb, int bustime, int isoc);
+static void crisv10_usb_release_bandwidth(
+	struct usb_hcd *hcd, int isoc, int bandwidth);
+
+static inline struct urb *urb_list_first(int epid);
+static inline void        urb_list_add(struct urb *urb, int epid,
+				      int mem_flags);
+static inline urb_entry_t *urb_list_entry(struct urb *urb, int epid);
+static inline void        urb_list_del(struct urb *urb, int epid);
+static inline void        urb_list_move_last(struct urb *urb, int epid);
+static inline struct urb *urb_list_next(struct urb *urb, int epid);
+
+int create_sb_for_urb(struct urb *urb, int mem_flags);
+int init_intr_urb(struct urb *urb, int mem_flags);
+
+static inline void  etrax_epid_set(__u8 index, __u32 data);
+static inline void  etrax_epid_clear_error(__u8 index);
+static inline void  etrax_epid_set_toggle(__u8 index, __u8 dirout,
+					      __u8 toggle);
+static inline __u8  etrax_epid_get_toggle(__u8 index, __u8 dirout);
+static inline __u32 etrax_epid_get(__u8 index);
+
+/* We're accessing the same register position in Etrax so
+   when we do full access the internal difference doesn't matter */
+#define etrax_epid_iso_set(index, data) etrax_epid_set(index, data)
+#define etrax_epid_iso_get(index) etrax_epid_get(index)
+
+
+static void        tc_dma_process_isoc_urb(struct urb *urb);
+static void        tc_dma_process_queue(int epid);
+static void        tc_dma_unlink_intr_urb(struct urb *urb);
+static irqreturn_t tc_dma_tx_interrupt(int irq, void *vhc);
+static irqreturn_t tc_dma_rx_interrupt(int irq, void *vhc);
+
+static void tc_bulk_start_timer_func(unsigned long dummy);
+static void tc_bulk_eot_timer_func(unsigned long dummy);
+
+
+/*************************************************************/
+/*************************************************************/
+/* Host Controler Driver block                               */
+/*************************************************************/
+/*************************************************************/
+
+/* HCD operations */
+static irqreturn_t crisv10_hcd_top_irq(int irq, void*);
+static int crisv10_hcd_reset(struct usb_hcd *);
+static int crisv10_hcd_start(struct usb_hcd *);
+static void crisv10_hcd_stop(struct usb_hcd *);
+#ifdef CONFIG_PM
+static int crisv10_hcd_suspend(struct device *, u32, u32);
+static int crisv10_hcd_resume(struct device *, u32);
+#endif /* CONFIG_PM */
+static int crisv10_hcd_get_frame(struct usb_hcd *);
+
+static int  tc_urb_enqueue(struct usb_hcd *, struct urb *, gfp_t mem_flags);
+static int  tc_urb_dequeue(struct usb_hcd *, struct urb *, int);
+static void tc_endpoint_disable(struct usb_hcd *, struct usb_host_endpoint *ep);
+
+static int rh_status_data_request(struct usb_hcd *, char *);
+static int rh_control_request(struct usb_hcd *, u16, u16, u16, char*, u16);
+
+#ifdef CONFIG_PM
+static int crisv10_hcd_hub_suspend(struct usb_hcd *);
+static int crisv10_hcd_hub_resume(struct usb_hcd *);
+#endif /* CONFIG_PM */
+#ifdef CONFIG_USB_OTG
+static int crisv10_hcd_start_port_reset(struct usb_hcd *, unsigned);
+#endif /* CONFIG_USB_OTG */
+
+/* host controller driver interface */
+static const struct hc_driver crisv10_hc_driver = 
+  {
+    .description =	hc_name,
+    .product_desc =	product_desc,
+    .hcd_priv_size =	sizeof(struct crisv10_hcd),
+
+    /* Attaching IRQ handler manualy in probe() */
+    /* .irq =		crisv10_hcd_irq, */
+
+    .flags =		HCD_USB11,
+
+    /* called to init HCD and root hub */
+    .reset =		crisv10_hcd_reset,
+    .start =		crisv10_hcd_start,	
+
+    /* cleanly make HCD stop writing memory and doing I/O */
+    .stop =		crisv10_hcd_stop,
+
+    /* return current frame number */
+    .get_frame_number =	crisv10_hcd_get_frame,
+
+
+    /* Manage i/o requests via the Transfer Controller */
+    .urb_enqueue =	tc_urb_enqueue,
+    .urb_dequeue =	tc_urb_dequeue,
+
+    /* hw synch, freeing endpoint resources that urb_dequeue can't */
+    .endpoint_disable = tc_endpoint_disable,
+
+
+    /* Root Hub support */
+    .hub_status_data =	rh_status_data_request,
+    .hub_control =	rh_control_request,
+#ifdef CONFIG_PM
+    .hub_suspend =	rh_suspend_request,
+    .hub_resume =	rh_resume_request,
+#endif /* CONFIG_PM */
+#ifdef	CONFIG_USB_OTG
+    .start_port_reset =	crisv10_hcd_start_port_reset,
+#endif /* CONFIG_USB_OTG */
+  };
+
+
+/*
+ * conversion between pointers to a hcd and the corresponding
+ * crisv10_hcd 
+ */
+
+static inline struct crisv10_hcd *hcd_to_crisv10_hcd(struct usb_hcd *hcd)
+{
+	return (struct crisv10_hcd *) hcd->hcd_priv;
+}
+
+static inline struct usb_hcd *crisv10_hcd_to_hcd(struct crisv10_hcd *hcd)
+{
+	return container_of((void *) hcd, struct usb_hcd, hcd_priv);
+}
+
+/* check if specified port is in use */
+static inline int port_in_use(unsigned int port)
+{
+	return ports & (1 << port);
+}
+
+/* number of ports in use */
+static inline unsigned int num_ports(void)
+{
+	unsigned int i, num = 0;
+	for (i = 0; i < USB_ROOT_HUB_PORTS; i++)
+		if (port_in_use(i))
+			num++;
+	return num;
+}
+
+/* map hub port number to the port number used internally by the HC */
+static inline unsigned int map_port(unsigned int port)
+{
+  unsigned int i, num = 0;
+  for (i = 0; i < USB_ROOT_HUB_PORTS; i++)
+    if (port_in_use(i))
+      if (++num == port)
+	return i;
+  return -1;
+}
+
+/* size of descriptors in slab cache */
+#ifndef MAX
+#define MAX(x, y)		((x) > (y) ? (x) : (y))
+#endif
+
+
+/******************************************************************/
+/* Hardware Interrupt functions                                   */
+/******************************************************************/
+
+/* Fast interrupt handler for HC */
+static irqreturn_t crisv10_hcd_top_irq(int irq, void *vcd)
+{
+  struct usb_hcd *hcd = vcd;
+  struct crisv10_irq_reg reg;
+  __u32 irq_mask;
+  unsigned long flags;
+
+  DBFENTER;
+
+  ASSERT(hcd != NULL);
+  reg.hcd = hcd;
+
+  /* Turn of other interrupts while handling these sensitive cases */
+  local_irq_save(flags);
+  
+  /* Read out which interrupts that are flaged */
+  irq_mask = *R_USB_IRQ_MASK_READ;
+  reg.r_usb_irq_mask_read = irq_mask;
+
+  /* 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. */
+  reg.r_usb_status = *R_USB_STATUS;
+  
+  /* Reading R_USB_EPID_ATTN clears the iso_eof, bulk_eot and epid_attn
+     interrupts. */
+  reg.r_usb_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. */
+  reg.r_usb_rh_port_status_1 = *R_USB_RH_PORT_STATUS_1;
+  reg.r_usb_rh_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. */
+  reg.r_usb_fm_number = *R_USB_FM_NUMBER;
+
+  /* Interrupts are handled in order of priority. */
+  if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, port_status)) {
+    crisv10_hcd_port_status_irq(&reg);
+  }
+  if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, epid_attn)) {
+    crisv10_hcd_epid_attn_irq(&reg);
+  }
+  if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, ctl_status)) {
+    crisv10_hcd_ctl_status_irq(&reg);
+  }
+  if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, iso_eof)) {
+    crisv10_hcd_isoc_eof_irq(&reg);
+  }
+  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);
+
+    /* Check for finished bulk transfers on epids */
+    check_finished_bulk_tx_epids(hcd, 0);
+  }
+  local_irq_restore(flags);
+
+  DBFEXIT;
+  return IRQ_HANDLED;
+}
+
+
+void crisv10_hcd_epid_attn_irq(struct crisv10_irq_reg *reg) {
+  struct usb_hcd *hcd = reg->hcd;
+  struct crisv10_urb_priv *urb_priv;
+  int epid;
+  DBFENTER;
+
+  for (epid = 0; epid < NBR_OF_EPIDS; epid++) {
+    if (test_bit(epid, (void *)&reg->r_usb_epid_attn)) {
+      struct urb *urb;
+      __u32 ept_data;
+      int error_code;
+
+      if (epid == DUMMY_EPID || epid == INVALID_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. */
+	continue;
+      }
+
+      if(!epid_inuse(epid)) {
+	irq_err("Epid attention on epid:%d that isn't in use\n", epid);
+	printk("R_USB_STATUS: 0x%x\n", reg->r_usb_status);
+	debug_epid(epid);
+	continue;
+      }
+
+      /* 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. */
+      ept_data = etrax_epid_get(epid);
+      error_code = IO_EXTRACT(R_USB_EPT_DATA, error_code, ept_data);
+
+      /* Get the active URB for this epid. We blatantly assume
+	 that only this URB could have caused the epid attention. */
+      urb = activeUrbList[epid];
+      if (urb == NULL) {
+	irq_err("Attention on epid:%d error:%d with no active URB.\n",
+		epid, error_code);
+	printk("R_USB_STATUS: 0x%x\n", reg->r_usb_status);
+	debug_epid(epid);
+	continue;
+      }
+
+      urb_priv = (struct crisv10_urb_priv *)urb->hcpriv;
+      ASSERT(urb_priv);
+
+      /* 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, ept_data) == 3 ||
+	     IO_EXTRACT(R_USB_EPT_DATA, error_count_out, ept_data) == 3)) {
+	  /* Check if URB allready is marked for late-finish, we can get
+	     several 3rd error for Intr traffic when a device is unplugged */
+	  if(urb_priv->later_data == NULL) {
+	    /* 3rd error. */
+	    irq_warn("3rd error for epid:%d (%s %s) URB:0x%x[%d]\n", epid,
+		     str_dir(urb->pipe), str_type(urb->pipe),
+		     (unsigned int)urb, urb_priv->urb_num);
+	  
+	    tc_finish_urb_later(hcd, urb, -EPROTO);
+	  }
+
+	} else if (reg->r_usb_status & IO_MASK(R_USB_STATUS, perror)) {
+	  irq_warn("Perror for epid:%d\n", epid);
+	  printk("FM_NUMBER: %d\n", reg->r_usb_fm_number & 0x7ff);
+	  printk("R_USB_STATUS: 0x%x\n", reg->r_usb_status);
+	  __dump_urb(urb);
+	  debug_epid(epid);
+
+	  if (!(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. */
+	    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 */
+	  printk("FM_NUMBER: %d\n", reg->r_usb_fm_number & 0x7ff);
+	  printk("R_USB_STATUS: 0x%x\n", reg->r_usb_status);
+	  __dump_urb(urb);
+	  debug_epid(epid);
+
+	  panic("Buffer overrun/underrun for epid:%d. DMA too busy?", epid);
+	} else {
+	  irq_warn("Attention on epid:%d (%s %s) with no error code\n", epid,
+		   str_dir(urb->pipe), str_type(urb->pipe));
+	  printk("R_USB_STATUS: 0x%x\n", reg->r_usb_status);
+	  __dump_urb(urb);
+	  debug_epid(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");
+	}
+
+	tc_dbg("Stall for epid:%d (%s %s) URB:0x%x\n", epid,
+	       str_dir(urb->pipe), str_type(urb->pipe), (unsigned int)urb);
+	tc_finish_urb(hcd, 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\n",
+	      epid);
+
+      } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code,
+					      buffer_error)) {
+	/* DMA overrun or underrun. */
+	irq_warn("Buffer overrun/underrun for epid:%d (%s %s)\n", epid,
+		 str_dir(urb->pipe), str_type(urb->pipe));
+
+	/* 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. */
+	tc_finish_urb(hcd, urb, -EPROTO);
+      } else {
+	  irq_warn("Unknown attention on epid:%d (%s %s)\n", epid,
+		   str_dir(urb->pipe), str_type(urb->pipe));
+	  dump_ept_data(epid);
+      }
+    }
+  }
+  DBFEXIT;
+}
+
+void crisv10_hcd_port_status_irq(struct crisv10_irq_reg *reg)
+{
+  __u16 port_reg[USB_ROOT_HUB_PORTS];
+  DBFENTER;
+  port_reg[0] = reg->r_usb_rh_port_status_1;
+  port_reg[1] = reg->r_usb_rh_port_status_2;
+  rh_port_status_change(port_reg);
+  DBFEXIT;
+}
+
+void crisv10_hcd_isoc_eof_irq(struct crisv10_irq_reg *reg)
+{
+  int epid;
+  struct urb *urb;
+  struct crisv10_urb_priv *urb_priv;
+
+  DBFENTER;
+
+  for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) {
+
+    /* Only check epids that are in use, is valid and has SB list */
+    if (!epid_inuse(epid) || epid == INVALID_EPID ||
+	TxIsocEPList[epid].sub == 0 || epid == DUMMY_EPID) {
+      /* Nothing here to see. */
+      continue;
+    }
+    ASSERT(epid_isoc(epid));
+
+    /* Get the active URB for this epid (if any). */
+    urb = activeUrbList[epid];
+    if (urb == 0) {
+      isoc_warn("Ignoring NULL urb for epid:%d\n", epid);
+      continue;
+    }
+    if(!epid_out_traffic(epid)) {
+      /* Sanity check. */
+      ASSERT(usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS);
+
+      urb_priv = (struct crisv10_urb_priv *)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))) {
+	  /* EP should not be enabled if we're waiting for start_frame */
+	  ASSERT((TxIsocEPList[epid].command &
+		  IO_STATE(USB_EP_command, enable, yes)) == 0);
+
+	  isoc_warn("Enabling isoc IN EP descr for epid %d\n", epid);
+	  TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
+
+	  /* This urb is now active. */
+	  urb_priv->urb_state = STARTED;
+	  continue;
+	}
+      }
+    }
+  }
+
+  DBFEXIT;
+}
+
+void crisv10_hcd_ctl_status_irq(struct crisv10_irq_reg *reg)
+{
+  struct crisv10_hcd* crisv10_hcd = hcd_to_crisv10_hcd(reg->hcd);
+
+  DBFENTER;
+  ASSERT(crisv10_hcd);
+
+/*  irq_dbg("ctr_status_irq, controller status: %s\n",
+	  hcd_status_to_str(reg->r_usb_status));*/
+  
+  /* 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.");
+  }
+
+  /* Keep track of USB Controller, if it's running or not */
+  if(reg->r_usb_status & IO_STATE(R_USB_STATUS, running, yes)) {
+    crisv10_hcd->running = 1;
+  } else {
+    crisv10_hcd->running = 0;
+  }
+  
+  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.");
+  }
+
+  /* Set the flag to avoid getting "Unlink after no-IRQ? Controller is probably
+     using the wrong IRQ" from hcd_unlink_urb() in drivers/usb/core/hcd.c */
+  set_bit(HCD_FLAG_SAW_IRQ, &reg->hcd->flags);
+  
+  DBFEXIT;
+}
+
+
+/******************************************************************/
+/* Host Controller interface functions                            */
+/******************************************************************/
+
+static inline void crisv10_ready_wait(void) {
+  volatile int timeout = 10000;
+  /* Check the busy bit of USB controller in Etrax */
+  while((*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy)) &&
+	(timeout-- > 0));
+}
+
+/* reset host controller */
+static int crisv10_hcd_reset(struct usb_hcd *hcd)
+{
+  DBFENTER;
+  hcd_dbg(hcd, "reset\n");
+
+
+  /* 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);
+  nop();
+  */
+  DBFEXIT;
+  return 0;
+}
+
+/* start host controller */
+static int crisv10_hcd_start(struct usb_hcd *hcd)
+{
+  DBFENTER;
+  hcd_dbg(hcd, "start\n");
+
+  crisv10_ready_wait();
+
+  /* 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);
+
+  nop();
+
+  hcd->state = HC_STATE_RUNNING;
+
+  DBFEXIT;
+  return 0;
+}
+
+/* stop host controller */
+static void crisv10_hcd_stop(struct usb_hcd *hcd)
+{
+  DBFENTER;
+  hcd_dbg(hcd, "stop\n");
+  crisv10_hcd_reset(hcd);
+  DBFEXIT;
+}
+
+/* return the current frame number */
+static int crisv10_hcd_get_frame(struct usb_hcd *hcd)
+{
+  DBFENTER;
+  DBFEXIT;
+  return (*R_USB_FM_NUMBER & 0x7ff);
+}
+
+#ifdef	CONFIG_USB_OTG
+
+static int crisv10_hcd_start_port_reset(struct usb_hcd *hcd, unsigned port)
+{
+  return 0; /* no-op for now */
+}
+
+#endif /* CONFIG_USB_OTG */
+
+
+/******************************************************************/
+/* Root Hub functions                                             */
+/******************************************************************/
+
+/* root hub status */
+static const struct usb_hub_status rh_hub_status = 
+  {
+    .wHubStatus =		0,
+    .wHubChange =		0,
+  };
+
+/* root hub descriptor */
+static const u8 rh_hub_descr[] =
+  {
+    0x09,			/* bDescLength	       */
+    0x29,			/* bDescriptorType     */
+    USB_ROOT_HUB_PORTS,         /* bNbrPorts	       */
+    0x00,			/* wHubCharacteristics */
+    0x00,		 
+    0x01,			/* bPwrOn2pwrGood      */
+    0x00,			/* bHubContrCurrent    */
+    0x00,			/* DeviceRemovable     */
+    0xff			/* PortPwrCtrlMask     */
+  };
+
+/* Actual holder of root hub status*/
+struct crisv10_rh rh;
+
+/* Initialize root hub data structures (called from dvdrv_hcd_probe()) */
+int rh_init(void) {
+  int i;
+  /* Reset port status flags */
+  for (i = 0; i < USB_ROOT_HUB_PORTS; i++) {
+    rh.wPortChange[i] = 0;
+    rh.wPortStatusPrev[i] = 0;
+  }
+  return 0;
+}
+
+#define RH_FEAT_MASK ((1<<USB_PORT_FEAT_CONNECTION)|\
+		      (1<<USB_PORT_FEAT_ENABLE)|\
+		      (1<<USB_PORT_FEAT_SUSPEND)|\
+		      (1<<USB_PORT_FEAT_RESET))
+
+/* Handle port status change interrupt (called from bottom part interrupt) */
+void rh_port_status_change(__u16 port_reg[]) {
+  int i;
+  __u16 wChange;
+
+  for(i = 0; i < USB_ROOT_HUB_PORTS; i++) {
+    /* Xor out changes since last read, masked for important flags */
+    wChange = (port_reg[i] & RH_FEAT_MASK) ^ rh.wPortStatusPrev[i];
+    /* Or changes together with (if any) saved changes */
+    rh.wPortChange[i] |= wChange;
+    /* Save new status */
+    rh.wPortStatusPrev[i] = port_reg[i];
+
+    if(wChange) {
+      rh_dbg("Interrupt port_status change port%d: %s  Current-status:%s\n", i+1,
+	     port_status_to_str(wChange),
+	     port_status_to_str(port_reg[i]));
+    }
+  }
+}
+
+/* Construct port status change bitmap for the root hub */
+static int rh_status_data_request(struct usb_hcd *hcd, char *buf)
+{
+  struct crisv10_hcd* crisv10_hcd = hcd_to_crisv10_hcd(hcd);
+  unsigned int i;
+
+  DBFENTER;
+  /*
+   * corresponds to hub status change EP (USB 2.0 spec section 11.13.4)
+   * return bitmap indicating ports with status change
+   */
+  *buf = 0;
+  spin_lock(&crisv10_hcd->lock);
+  for (i = 1; i <= crisv10_hcd->num_ports; i++) {
+    if (rh.wPortChange[map_port(i)]) {
+      *buf |= (1 << i);
+      rh_dbg("rh_status_data_request, change on port %d: %s  Current Status: %s\n", i,
+	     port_status_to_str(rh.wPortChange[map_port(i)]),
+	     port_status_to_str(rh.wPortStatusPrev[map_port(i)]));
+    }
+  }
+  spin_unlock(&crisv10_hcd->lock);
+  DBFEXIT;
+  return *buf == 0 ? 0 : 1;
+}
+
+/* Handle a control request for the root hub (called from hcd_driver) */
+static int rh_control_request(struct usb_hcd *hcd, 
+			      u16 typeReq, 
+			      u16 wValue, 
+			      u16 wIndex,
+			      char *buf, 
+			      u16 wLength) {
+
+  struct crisv10_hcd *crisv10_hcd = hcd_to_crisv10_hcd(hcd);
+  int retval = 0;
+  int len;
+  DBFENTER;
+
+  switch (typeReq) {
+  case GetHubDescriptor:
+    rh_dbg("GetHubDescriptor\n");
+    len = min_t(unsigned int, sizeof rh_hub_descr, wLength);
+    memcpy(buf, rh_hub_descr, len);
+    buf[2] = crisv10_hcd->num_ports;
+    break;
+  case GetHubStatus:
+    rh_dbg("GetHubStatus\n");
+    len = min_t(unsigned int, sizeof rh_hub_status, wLength);
+    memcpy(buf, &rh_hub_status, len);
+    break;
+  case GetPortStatus:
+    if (!wIndex || wIndex > crisv10_hcd->num_ports)
+      goto error;
+    rh_dbg("GetportStatus, port:%d change:%s  status:%s\n", wIndex,
+	   port_status_to_str(rh.wPortChange[map_port(wIndex)]),
+	   port_status_to_str(rh.wPortStatusPrev[map_port(wIndex)]));
+    *(u16 *) buf = cpu_to_le16(rh.wPortStatusPrev[map_port(wIndex)]);
+    *(u16 *) (buf + 2) = cpu_to_le16(rh.wPortChange[map_port(wIndex)]);
+    break;
+  case SetHubFeature:
+    rh_dbg("SetHubFeature\n");
+  case ClearHubFeature:
+    rh_dbg("ClearHubFeature\n");
+    switch (wValue) {
+    case C_HUB_OVER_CURRENT:
+    case C_HUB_LOCAL_POWER:
+      rh_warn("Not implemented hub request:%d \n", typeReq);
+      /* not implemented */
+      break;
+    default:
+      goto error;
+    }
+    break;
+  case SetPortFeature:
+    if (!wIndex || wIndex > crisv10_hcd->num_ports)
+      goto error;
+    if(rh_set_port_feature(map_port(wIndex), wValue))
+      goto error;
+    break;
+  case ClearPortFeature:
+    if (!wIndex || wIndex > crisv10_hcd->num_ports)
+      goto error;
+    if(rh_clear_port_feature(map_port(wIndex), wValue))
+      goto error;
+    break;
+  default:
+    rh_warn("Unknown hub request: %d\n", typeReq);
+  error:
+    retval = -EPIPE;
+  }
+  DBFEXIT;
+  return retval;
+}
+
+int rh_set_port_feature(__u8 bPort, __u16 wFeature) {
+  __u8 bUsbCommand = 0;
+  __u8 reset_cnt;
+  switch(wFeature) {
+  case USB_PORT_FEAT_RESET:
+    rh_dbg("SetPortFeature: reset\n");
+
+    if (rh.wPortStatusPrev[bPort] &
+        IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, yes))
+    {
+      __u8 restart_controller = 0;
+
+      if ( (rh.wPortStatusPrev[0] &
+            IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, yes)) &&
+           (rh.wPortStatusPrev[1] &
+            IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, yes)) )
+      {
+        /* Both ports is enabled. The USB controller will not change state. */
+        restart_controller = 0;
+      }
+      else
+      {
+        /* Only ports is enabled. The USB controller will change state and
+           must be restarted. */
+        restart_controller = 1;
+      }
+      /*
+        In ETRAX 100LX it's not possible to reset an enabled root hub port.
+        The workaround is to disable and enable the port before resetting it.
+        Disabling the port can, if both ports are disabled at once, cause the
+        USB controller to change state to HOST_MODE state. 
+        The USB controller state transition causes a lot of unwanted
+        interrupts that must be avoided.
+        Disabling the USB controller status and port status interrupts before
+        disabling/resetting the port stops these interrupts.
+
+        These actions are performed:
+        1. Disable USB controller status and port status interrupts.
+        2. Disable the port
+        3. Wait for the port to be disabled.
+        4. Enable the port.
+        5. Wait for the port to be enabled.
+        6. Reset the port.
+        7. Wait for for the reset to end.
+        8. Wait for the USB controller entering started state.
+        9. Order the USB controller to running state.
+        10. Wait for the USB controller reaching running state.
+        11. Clear all interrupts generated during the disable/enable/reset
+            procedure.
+        12. Enable the USB controller status and port status interrupts.
+      */
+
+      /* 1. Disable USB controller status and USB port status interrupts. */
+      *R_USB_IRQ_MASK_CLR = IO_STATE(R_USB_IRQ_MASK_CLR, ctl_status, clr);
+      __asm__ __volatile__ ("  nop");
+      *R_USB_IRQ_MASK_CLR = IO_STATE(R_USB_IRQ_MASK_CLR, port_status, clr);
+      __asm__ __volatile__ ("  nop");
+      
+      {
+
+        /* Since an root hub port reset shall be 50 ms and the ETRAX 100LX
+           root hub port reset is 10 ms we must perform 5 port resets to
+           achieve a proper root hub port reset. */
+        for (reset_cnt = 0; reset_cnt < 5; reset_cnt ++)
+        {
+          rh_dbg("Disable Port %d\n", bPort + 1);
+
+          /* 2. Disable the port*/
+          if (bPort == 0)
+          {
+            *R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, yes);
+          }
+          else
+          {
+            *R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, yes);
+          }
+
+          /* 3. Wait for the port to be disabled. */
+          while ( (bPort == 0) ?
+                  *R_USB_RH_PORT_STATUS_1 &
+                    IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, yes) :
+                  *R_USB_RH_PORT_STATUS_2 &
+                    IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, yes) ) {}
+
+          rh_dbg("Port %d is disabled. Enable it!\n", bPort + 1);
+
+          /* 4. Enable the port. */
+          if (bPort == 0)
+          {
+            *R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, no);
+          }
+          else
+          {
+            *R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, no);
+          }
+
+          /* 5. Wait for the port to be enabled again.  */
+          while (!( (bPort == 0) ?
+                    *R_USB_RH_PORT_STATUS_1 &
+                      IO_STATE(R_USB_RH_PORT_STATUS_1, connected, yes) :
+                    *R_USB_RH_PORT_STATUS_2 &
+                      IO_STATE(R_USB_RH_PORT_STATUS_2, connected, yes) ) ) {}
+
+          rh_dbg("Port %d is enabled.\n", bPort + 1);
+
+          /* 6. Reset the port */
+          crisv10_ready_wait();
+          *R_USB_COMMAND =
+            ( (bPort == 0) ?
+              IO_STATE(R_USB_COMMAND, port_sel, port1):
+              IO_STATE(R_USB_COMMAND, port_sel, port2) ) |
+            IO_STATE(R_USB_COMMAND, port_cmd, reset) |
+            IO_STATE(R_USB_COMMAND, busy,     no) |
+            IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
+          rh_dbg("Port %d is resetting.\n", bPort + 1);
+
+          /* 7. The USB specification says that we should wait for at least
+             10ms for device recover */
+          udelay(10500); /* 10,5ms blocking wait */
+    
+          crisv10_ready_wait();
+        }
+      }
+
+
+      /* Check if the USB controller needs to be restarted. */
+      if (restart_controller)
+      {
+        /* 8. Wait for the USB controller entering started state. */
+        while (!(*R_USB_STATUS & IO_STATE(R_USB_STATUS, started, yes))) {}
+
+        /* 9. Order the USB controller to running state. */
+        crisv10_ready_wait();
+        *R_USB_COMMAND =
+          IO_STATE(R_USB_COMMAND, port_sel, nop) |
+          IO_STATE(R_USB_COMMAND, port_cmd, reset) |
+          IO_STATE(R_USB_COMMAND, busy,     no) |
+          IO_STATE(R_USB_COMMAND, ctrl_cmd, host_run);
+
+        /* 10. Wait for the USB controller reaching running state. */
+        while (!(*R_USB_STATUS & IO_STATE(R_USB_STATUS, running, yes))) {}
+      }
+
+      /* 11. Clear any controller or port satus interrupts before enabling
+             the interrupts. */
+      {
+        u16 dummy;
+
+        /* Clear the port status interrupt of the reset port. */
+        if (bPort == 0)
+        {
+          rh_dbg("Clearing port 1 interrupts\n");
+          dummy = *R_USB_RH_PORT_STATUS_1;
+        }
+        else
+        {
+          rh_dbg("Clearing port 2 interrupts\n");
+          dummy = *R_USB_RH_PORT_STATUS_2;
+        }
+
+        if (restart_controller)
+        {
+          /* The USB controller is restarted. Clear all interupts. */
+          rh_dbg("Clearing all interrupts\n");
+          dummy = *R_USB_STATUS;
+          dummy = *R_USB_RH_PORT_STATUS_1;
+          dummy = *R_USB_RH_PORT_STATUS_2;
+        }
+      }
+
+      /* 12. Enable USB controller status and USB port status interrupts.  */
+      *R_USB_IRQ_MASK_SET = IO_STATE(R_USB_IRQ_MASK_SET, ctl_status, set);
+      __asm__ __volatile__ ("  nop");
+      *R_USB_IRQ_MASK_SET = IO_STATE(R_USB_IRQ_MASK_SET, port_status, set);
+      __asm__ __volatile__ ("  nop");
+
+    }
+    else
+    {
+
+      bUsbCommand |= IO_STATE(R_USB_COMMAND, port_cmd, reset);
+      /* Select which port via the port_sel field */
+      bUsbCommand |= IO_FIELD(R_USB_COMMAND, port_sel, bPort+1);
+
+      /* Make sure the controller isn't busy. */
+      crisv10_ready_wait();
+      /* Send out the actual command to the USB controller */
+      *R_USB_COMMAND = bUsbCommand;
+
+      /* Wait a while for controller to first become started after port reset */
+      udelay(12000); /* 12ms blocking wait */
+      
+      /* Make sure the controller isn't busy. */
+      crisv10_ready_wait();
+
+      /* 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);
+    }
+
+    break;
+  case USB_PORT_FEAT_SUSPEND:
+    rh_dbg("SetPortFeature: suspend\n");
+    bUsbCommand |= IO_STATE(R_USB_COMMAND, port_cmd, suspend);
+    goto set;
+    break;
+  case USB_PORT_FEAT_POWER:
+    rh_dbg("SetPortFeature: power\n");
+    break;
+  case USB_PORT_FEAT_C_CONNECTION:
+    rh_dbg("SetPortFeature: c_connection\n");
+    break;
+  case USB_PORT_FEAT_C_RESET:
+    rh_dbg("SetPortFeature: c_reset\n");
+    break;
+  case USB_PORT_FEAT_C_OVER_CURRENT:
+    rh_dbg("SetPortFeature: c_over_current\n");
+    break;
+
+  set:
+    /* Select which port via the port_sel field */
+    bUsbCommand |= IO_FIELD(R_USB_COMMAND, port_sel, bPort+1);
+
+    /* Make sure the controller isn't busy. */
+    crisv10_ready_wait();
+    /* Send out the actual command to the USB controller */
+    *R_USB_COMMAND = bUsbCommand;
+    break;
+  default:
+    rh_dbg("SetPortFeature: unknown feature\n");
+    return -1;
+  }
+  return 0;
+}
+
+int rh_clear_port_feature(__u8 bPort, __u16 wFeature) {
+  switch(wFeature) {
+  case USB_PORT_FEAT_ENABLE:
+    rh_dbg("ClearPortFeature: enable\n");
+    rh_disable_port(bPort);
+    break;
+  case USB_PORT_FEAT_SUSPEND:
+    rh_dbg("ClearPortFeature: suspend\n");
+    break;
+  case USB_PORT_FEAT_POWER:
+    rh_dbg("ClearPortFeature: power\n");
+    break;
+
+  case USB_PORT_FEAT_C_ENABLE:
+    rh_dbg("ClearPortFeature: c_enable\n");
+    goto clear;
+  case USB_PORT_FEAT_C_SUSPEND:
+    rh_dbg("ClearPortFeature: c_suspend\n");
+    goto clear;
+  case USB_PORT_FEAT_C_CONNECTION:
+    rh_dbg("ClearPortFeature: c_connection\n");
+    goto clear;
+  case USB_PORT_FEAT_C_OVER_CURRENT:
+    rh_dbg("ClearPortFeature: c_over_current\n");
+    goto clear;
+  case USB_PORT_FEAT_C_RESET:
+    rh_dbg("ClearPortFeature: c_reset\n");
+    goto clear;
+  clear:
+    rh.wPortChange[bPort] &= ~(1 << (wFeature - 16));
+    break;
+  default:
+    rh_dbg("ClearPortFeature: unknown feature\n");
+    return -1;
+  }
+  return 0;
+}
+
+
+#ifdef	CONFIG_PM
+/* Handle a suspend request for the root hub (called from hcd_driver) */
+static int rh_suspend_request(struct usb_hcd *hcd)
+{
+  return 0; /* no-op for now */
+}
+
+/* Handle a resume request for the root hub (called from hcd_driver) */
+static int rh_resume_request(struct usb_hcd *hcd)
+{
+  return 0; /* no-op for now */
+}
+#endif /* CONFIG_PM */
+
+
+
+/* Wrapper function for workaround port disable registers in USB controller  */
+static void rh_disable_port(unsigned int port) {
+  volatile int timeout = 10000;
+  volatile char* usb_portx_disable;
+  switch(port) {
+  case 0:
+    usb_portx_disable = R_USB_PORT1_DISABLE;
+    break;
+  case 1:
+    usb_portx_disable = R_USB_PORT2_DISABLE;
+    break;
+  default:
+    /* Invalid port index */
+    return;
+  }
+  /* Set disable flag in special register  */
+  *usb_portx_disable = IO_STATE(R_USB_PORT1_DISABLE, disable, yes);
+  /* Wait until not enabled anymore */
+  while((rh.wPortStatusPrev[port] &
+	IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, yes)) &&
+	(timeout-- > 0));
+
+  /* clear disable flag in special register  */
+  *usb_portx_disable = IO_STATE(R_USB_PORT1_DISABLE, disable, no);
+  rh_info("Physical port %d disabled\n", port+1);
+}
+
+
+/******************************************************************/
+/* Transfer Controller (TC) functions                             */
+/******************************************************************/
+
+/* 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)
+
+
+/* Local variables for Transfer Controller */
+/* --------------------------------------- */
+
+/* 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 (which includes spin_locks) */
+static struct list_head urb_list[NBR_OF_EPIDS];
+
+/* Read about the need and usage of this lock in submit_ctrl_urb. */
+/* Lock for URB lists for each EPID */
+static spinlock_t urb_list_lock;
+
+/* Lock for EPID array register (R_USB_EPT_x) in Etrax */
+static spinlock_t etrax_epid_lock;
+
+/* Lock for dma8 sub0 handling */
+static spinlock_t etrax_dma8_sub0_lock;
+
+/* 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 struct USB_IN_Desc RxDescList[NBR_OF_RX_DESC] __attribute__ ((aligned (4)));
+
+/* Pointers into RxDescList. */
+static volatile struct USB_IN_Desc *myNextRxDesc;
+static volatile struct USB_IN_Desc *myLastRxDesc;
+
+/* 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 data allocated in the isoc descr top half. */
+static struct kmem_cache *isoc_compl_cache;
+
+/* Cache for the data allocated when delayed finishing of URBs */
+static struct kmem_cache *later_data_cache;
+
+
+/* Counter to keep track of how many Isoc EP we have sat up. Used to enable
+   and disable iso_eof interrupt. We only need these interrupts when we have
+   Isoc data endpoints (consumes CPU cycles).
+   FIXME: This could be more fine granular, so this interrupt is only enabled
+   when we have a In Isoc URB not URB_ISO_ASAP flaged queued. */
+static int isoc_epid_counter;
+
+/* Protecting wrapper functions for R_USB_EPT_x */
+/* -------------------------------------------- */
+static inline void etrax_epid_set(__u8 index, __u32 data) {
+  unsigned long flags;
+  spin_lock_irqsave(&etrax_epid_lock, flags);
+  *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, index);
+  nop();
+  *R_USB_EPT_DATA = data;
+  spin_unlock_irqrestore(&etrax_epid_lock, flags);
+}
+
+static inline void etrax_epid_clear_error(__u8 index) {
+  unsigned long flags;
+  spin_lock_irqsave(&etrax_epid_lock, flags);
+  *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, index);
+  nop();
+  *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, error_code));
+  spin_unlock_irqrestore(&etrax_epid_lock, flags);
+}
+
+static inline void etrax_epid_set_toggle(__u8 index, __u8 dirout,
+                                             __u8 toggle) {
+  unsigned long flags;
+  spin_lock_irqsave(&etrax_epid_lock, flags);
+  *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, index);
+  nop();
+  if(dirout) {
+    *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 {
+    *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);
+  }
+  spin_unlock_irqrestore(&etrax_epid_lock, flags);
+}
+
+static inline __u8 etrax_epid_get_toggle(__u8 index, __u8 dirout) {
+  unsigned long flags;
+  __u8 toggle;
+  spin_lock_irqsave(&etrax_epid_lock, flags);
+  *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, index);
+  nop();
+  if (dirout) {
+    toggle = IO_EXTRACT(R_USB_EPT_DATA, t_out, *R_USB_EPT_DATA);
+  } else {
+    toggle = IO_EXTRACT(R_USB_EPT_DATA, t_in, *R_USB_EPT_DATA);
+  }
+  spin_unlock_irqrestore(&etrax_epid_lock, flags);
+  return toggle;
+}
+
+
+static inline __u32 etrax_epid_get(__u8 index) {
+  unsigned long flags;
+  __u32 data;
+  spin_lock_irqsave(&etrax_epid_lock, flags);
+  *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, index);
+  nop();
+  data = *R_USB_EPT_DATA;
+  spin_unlock_irqrestore(&etrax_epid_lock, flags);
+  return data;
+}
+
+
+
+
+/* Main functions for Transfer Controller */
+/* -------------------------------------- */
+
+/* Init structs, memories and lists used by Transfer Controller */
+int tc_init(struct usb_hcd *hcd) {
+  int i;
+  /* Clear software state info for all epids */
+  memset(epid_state, 0, sizeof(struct etrax_epid) * NBR_OF_EPIDS);
+
+  /* Set Invalid and Dummy as being in use and disabled */
+  epid_state[INVALID_EPID].inuse = 1;
+  epid_state[DUMMY_EPID].inuse = 1;
+  epid_state[INVALID_EPID].disabled = 1;
+  epid_state[DUMMY_EPID].disabled = 1;
+
+  /* Clear counter for how many Isoc epids we have sat up */
+  isoc_epid_counter = 0;
+
+  /* Initialize the urb list by initiating a head for each list.
+     Also reset list hodling active URB for each epid */
+  for (i = 0; i < NBR_OF_EPIDS; i++) {
+    INIT_LIST_HEAD(&urb_list[i]);
+    activeUrbList[i] = NULL;
+  }
+
+  /* Init lock for URB lists */
+  spin_lock_init(&urb_list_lock);
+  /* Init lock for Etrax R_USB_EPT register */
+  spin_lock_init(&etrax_epid_lock);
+  /* Init lock for Etrax dma8 sub0 handling */
+  spin_lock_init(&etrax_dma8_sub0_lock);
+
+  /* We use kmem_cache_* to make sure that all DMA desc. are dword aligned */
+
+  /* Note that we specify sizeof(struct USB_EP_Desc) as the size, but also
+     allocate SB descriptors from this cache. This is ok since
+     sizeof(struct USB_EP_Desc) == sizeof(struct USB_SB_Desc). */
+  usb_desc_cache = kmem_cache_create("usb_desc_cache",
+				     sizeof(struct USB_EP_Desc), 0,
+				     SLAB_HWCACHE_ALIGN, 0);
+  if(usb_desc_cache == NULL) {
+    return -ENOMEM;
+  }
+
+  /* Create slab cache for speedy allocation of memory for isoc bottom-half
+     interrupt handling */
+  isoc_compl_cache =
+    kmem_cache_create("isoc_compl_cache",
+		      sizeof(struct crisv10_isoc_complete_data),
+		      0, SLAB_HWCACHE_ALIGN, 0);
+  if(isoc_compl_cache == NULL) {
+    return -ENOMEM;
+  }
+
+  /* Create slab cache for speedy allocation of memory for later URB finish
+     struct */
+  later_data_cache =
+    kmem_cache_create("later_data_cache",
+		      sizeof(struct urb_later_data),
+		      0, SLAB_HWCACHE_ALIGN, 0);
+  if(later_data_cache == NULL) {
+    return -ENOMEM;
+  }
+
+
+  /* Initiate the bulk start timer. */
+  init_timer(&bulk_start_timer);
+  bulk_start_timer.expires = jiffies + BULK_START_TIMER_INTERVAL;
+  bulk_start_timer.function = tc_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 = tc_bulk_eot_timer_func;
+  bulk_eot_timer.data = (unsigned long)hcd;
+  add_timer(&bulk_eot_timer);
+
+  return 0;
+}
+
+/* Uninitialize all resources used by Transfer Controller */
+void tc_destroy(void) {
+
+  /* Destroy all slab cache */
+  kmem_cache_destroy(usb_desc_cache);
+  kmem_cache_destroy(isoc_compl_cache);
+  kmem_cache_destroy(later_data_cache);
+
+  /* Remove timers */
+  del_timer(&bulk_start_timer);
+  del_timer(&bulk_eot_timer);
+}
+
+static void restart_dma8_sub0(void) {
+  unsigned long flags;
+  spin_lock_irqsave(&etrax_dma8_sub0_lock, flags);
+  /* Verify that the dma is not running */
+  if ((*R_DMA_CH8_SUB0_CMD & IO_MASK(R_DMA_CH8_SUB0_CMD, cmd)) == 0) {
+    struct USB_EP_Desc *ep = (struct USB_EP_Desc *)phys_to_virt(*R_DMA_CH8_SUB0_EP);
+    while (DUMMY_EPID == IO_EXTRACT(USB_EP_command, epid, ep->command)) {
+      ep = (struct USB_EP_Desc *)phys_to_virt(ep->next);
+    }
+    /* Advance the DMA to the next EP descriptor that is not a DUMMY_EPID. */
+    *R_DMA_CH8_SUB0_EP = virt_to_phys(ep);
+    /* Restart the DMA */
+    *R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start);
+  }
+  spin_unlock_irqrestore(&etrax_dma8_sub0_lock, flags);
+}
+
+/* queue an URB with the transfer controller (called from hcd_driver) */
+static int tc_urb_enqueue(struct usb_hcd *hcd, 
+			  struct urb *urb, 
+			  gfp_t mem_flags) {
+  int epid;
+  int retval;
+  int bustime = 0;
+  int maxpacket;
+  unsigned long flags;
+  struct crisv10_urb_priv *urb_priv;
+  struct crisv10_hcd* crisv10_hcd = hcd_to_crisv10_hcd(hcd);
+  DBFENTER;
+
+  if(!(crisv10_hcd->running)) {
+    /* The USB Controller is not running, probably because no device is 
+       attached. No idea to enqueue URBs then */
+    tc_warn("Rejected enqueueing of URB:0x%x because no dev attached\n",
+	    (unsigned int)urb);
+    return -ENOENT;
+  }
+
+  maxpacket = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
+  /* Special case check for In Isoc transfers. Specification states that each
+     In Isoc transfer consists of one packet and therefore it should fit into
+     the transfer-buffer of an URB.
+     We do the check here to be sure (an invalid scenario can be produced with
+     parameters to the usbtest suite) */
+  if(usb_pipeisoc(urb->pipe) && usb_pipein(urb->pipe) &&
+     (urb->transfer_buffer_length < maxpacket)) {
+    tc_err("Submit In Isoc URB with buffer length:%d to pipe with maxpacketlen: %d\n", urb->transfer_buffer_length, maxpacket);
+    return -EMSGSIZE;
+  }
+
+  /* Check if there is a epid for URBs destination, if not this function
+     set up one. */
+  epid = tc_setup_epid(urb->ep, urb, mem_flags);
+  if (epid < 0) {
+    tc_err("Failed setup epid:%d for URB:0x%x\n", epid, (unsigned int)urb);
+    DBFEXIT;
+    return -ENOMEM;
+  }
+
+  if(urb == activeUrbList[epid]) {
+    tc_err("Resubmition of allready active URB:0x%x\n", (unsigned int)urb);
+    return -ENXIO;
+  }
+
+  if(urb_list_entry(urb, epid)) {
+    tc_err("Resubmition of allready queued URB:0x%x\n", (unsigned int)urb);
+    return -ENXIO;
+  }
+
+  /* If we actively have flaged endpoint as disabled then refuse submition */
+  if(epid_state[epid].disabled) {
+    return -ENOENT;
+  }
+
+  /* Allocate and init HC-private data for URB */
+  if(urb_priv_create(hcd, urb, epid, mem_flags) != 0) {
+    DBFEXIT;
+    return -ENOMEM;
+  }
+  urb_priv = urb->hcpriv;
+
+  /* Check if there is enough bandwidth for periodic transfer  */
+  if(usb_pipeint(urb->pipe) || usb_pipeisoc(urb->pipe)) {
+    /* only check (and later claim) if not already claimed */
+    if (urb_priv->bandwidth == 0) {
+      bustime = crisv10_usb_check_bandwidth(urb->dev, urb);
+      if (bustime < 0) {
+        tc_err("Not enough periodic bandwidth\n");
+        urb_priv_free(hcd, urb);
+        DBFEXIT;
+        return -ENOSPC;
+      }
+    }
+  }
+
+  tc_dbg("Enqueue URB:0x%x[%d] epid:%d (%s) bufflen:%d\n",
+	 (unsigned int)urb, urb_priv->urb_num, epid,
+	 pipe_to_str(urb->pipe), urb->transfer_buffer_length);
+
+  /* Create and link SBs required for this URB */
+  retval = create_sb_for_urb(urb, mem_flags);
+  if(retval != 0) {
+    tc_err("Failed to create SBs for URB:0x%x[%d]\n", (unsigned int)urb,
+	   urb_priv->urb_num);
+    urb_priv_free(hcd, urb);
+    DBFEXIT;
+    return retval;
+  }
+
+  /* Init intr EP pool if this URB is a INTR transfer. This pool is later
+     used when inserting EPs in the TxIntrEPList. We do the alloc here
+     so we can't run out of memory later */
+  if(usb_pipeint(urb->pipe)) {
+    retval = init_intr_urb(urb, mem_flags);
+    if(retval != 0) {
+      tc_warn("Failed to init Intr URB\n");
+      urb_priv_free(hcd, urb);
+      DBFEXIT;
+      return retval;
+    }
+  }
+
+  /* Disable other access when inserting USB */
+  local_irq_save(flags);
+
+  /* Claim bandwidth, if needed */
+  if(bustime) {
+    crisv10_usb_claim_bandwidth(urb->dev,
+                                urb,
+                                bustime,
+                                (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS));
+  }
+  
+  /* Add URB to EP queue */
+  urb_list_add(urb, epid, mem_flags);
+
+  if(usb_pipeisoc(urb->pipe)) {
+    /* Special processing of Isoc URBs. */
+    tc_dma_process_isoc_urb(urb);
+  } else {
+    /* Process EP queue for rest of the URB types (Bulk, Ctrl, Intr) */
+    tc_dma_process_queue(epid);
+  }
+
+  local_irq_restore(flags);
+
+  DBFEXIT;
+  return 0;
+}
+
+/* remove an URB from the transfer controller queues (called from hcd_driver)*/
+static int tc_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) {
+  struct crisv10_urb_priv *urb_priv;
+  unsigned long flags;
+  int epid;
+
+  DBFENTER;
+  /* Disable interrupts here since a descriptor interrupt for the isoc epid
+     will modify the sb list.  This could possibly be done more granular, but
+     urb_dequeue should not be used frequently anyway.
+  */
+  local_irq_save(flags);
+
+  urb->status = status;
+  urb_priv = urb->hcpriv;
+
+  if (!urb_priv) {
+    /* This happens if a device driver calls unlink on an urb that
+       was never submitted (lazy driver) or if the urb was completed
+       while dequeue was being called. */
+    tc_warn("Dequeing of not enqueued URB:0x%x\n", (unsigned int)urb);
+    local_irq_restore(flags);
+    return 0;
+  }
+  epid = urb_priv->epid;
+
+  tc_warn("Dequeing %s URB:0x%x[%d] (%s %s epid:%d) status:%d %s\n",
+	  (urb == activeUrbList[epid]) ? "active" : "queued",
+	  (unsigned int)urb, urb_priv->urb_num, str_dir(urb->pipe),
+	  str_type(urb->pipe), epid, urb->status,
+	  (urb_priv->later_data) ? "later-sched" : "");
+
+  /* For Bulk, Ctrl and Intr are only one URB active at a time. So any URB
+     that isn't active can be dequeued by just removing it from the queue */
+  if(usb_pipebulk(urb->pipe) || usb_pipecontrol(urb->pipe) ||
+     usb_pipeint(urb->pipe)) {
+
+    /* Check if URB haven't gone further than the queue */
+    if(urb != activeUrbList[epid]) {
+      ASSERT(urb_priv->later_data == NULL);
+      tc_warn("Dequeing URB:0x%x[%d] (%s %s epid:%d) from queue"
+	      " (not active)\n", (unsigned int)urb, urb_priv->urb_num,
+	      str_dir(urb->pipe), str_type(urb->pipe), epid);
+      
+      /* Finish the URB with error status from USB core */
+      tc_finish_urb(hcd, urb, urb->status);
+      local_irq_restore(flags);
+      return 0;
+    }
+  }
+
+  /* Set URB status to Unlink for handling when interrupt comes. */
+  urb_priv->urb_state = UNLINK;
+
+  /* Differentiate dequeing of Bulk and Ctrl from Isoc and Intr */
+  switch(usb_pipetype(urb->pipe)) {
+  case PIPE_BULK:
+    /* Check if EP still is enabled */
+    if (TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
+      /* The EP was enabled, disable it. */
+      TxBulkEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
+    }
+    /* Kicking dummy list out of the party. */
+    TxBulkEPList[epid].next = virt_to_phys(&TxBulkEPList[(epid + 1) % NBR_OF_EPIDS]);
+    break;
+  case PIPE_CONTROL:
+    /* Check if EP still is enabled */
+    if (TxCtrlEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
+      /* The EP was enabled, disable it. */
+      TxCtrlEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
+    }
+    break;
+  case PIPE_ISOCHRONOUS:
+    /* Disabling, busy-wait and unlinking of Isoc SBs will be done in
+       finish_isoc_urb(). Because there might the case when URB is dequeued
+       but there are other valid URBs waiting */
+
+    /* Check if In Isoc EP still is enabled */
+    if (TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
+      /* The EP was enabled, disable it. */
+      TxIsocEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
+    }
+    break;
+  case PIPE_INTERRUPT:
+    /* Special care is taken for interrupt URBs. EPs are unlinked in
+       tc_finish_urb */
+    break;
+  default:
+    break;
+  }
+
+  /* Asynchronous unlink, finish the URB later from scheduled or other
+     event (data finished, error) */
+  tc_finish_urb_later(hcd, urb, urb->status);
+
+  local_irq_restore(flags);
+  DBFEXIT;
+  return 0;
+}
+
+
+static void tc_sync_finish_epid(struct usb_hcd *hcd, int epid) {
+  volatile int timeout = 10000;
+  struct urb* urb;
+  struct crisv10_urb_priv* urb_priv;
+  unsigned long flags;
+  
+  volatile struct USB_EP_Desc *first_ep;  /* First EP in the list. */
+  volatile struct USB_EP_Desc *curr_ep;   /* Current EP, the iterator. */
+  volatile struct USB_EP_Desc *next_ep;   /* The EP after current. */
+
+  int type = epid_state[epid].type;
+
+  /* Setting this flag will cause enqueue() to return -ENOENT for new
+     submitions on this endpoint and finish_urb() wont process queue further */
+  epid_state[epid].disabled = 1;
+
+  switch(type) {
+  case PIPE_BULK:
+    /* Check if EP still is enabled */
+    if (TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
+      /* The EP was enabled, disable it. */
+      TxBulkEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
+      tc_warn("sync_finish: Disabling EP for epid:%d\n", epid);
+
+      /* Do busy-wait until DMA not using this EP descriptor anymore */
+      while((*R_DMA_CH8_SUB0_EP ==
+	     virt_to_phys(&TxBulkEPList[epid])) &&
+	    (timeout-- > 0));
+
+    }
+    break;
+
+  case PIPE_CONTROL:
+    /* Check if EP still is enabled */
+    if (TxCtrlEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
+      /* The EP was enabled, disable it. */
+      TxCtrlEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
+      tc_warn("sync_finish: Disabling EP for epid:%d\n", epid);
+
+      /* Do busy-wait until DMA not using this EP descriptor anymore */
+      while((*R_DMA_CH8_SUB1_EP ==
+	     virt_to_phys(&TxCtrlEPList[epid])) &&
+	    (timeout-- > 0));
+    }
+    break;
+
+  case PIPE_INTERRUPT:
+    local_irq_save(flags);
+    /* Disable all Intr EPs belonging to epid */
+    first_ep = &TxIntrEPList[0];
+    curr_ep = first_ep;
+    do {
+      next_ep = (struct USB_EP_Desc *)phys_to_virt(curr_ep->next);
+      if (IO_EXTRACT(USB_EP_command, epid, next_ep->command) == epid) {
+	/* Disable EP */
+	next_ep->command &= ~IO_MASK(USB_EP_command, enable);
+      }
+      curr_ep = phys_to_virt(curr_ep->next);
+    } while (curr_ep != first_ep);
+
+    local_irq_restore(flags);
+    break;
+
+  case PIPE_ISOCHRONOUS:
+    /* Check if EP still is enabled */
+    if (TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
+      tc_warn("sync_finish: Disabling Isoc EP for epid:%d\n", epid);
+      /* The EP was enabled, disable it. */
+      TxIsocEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
+      
+      while((*R_DMA_CH8_SUB3_EP == virt_to_phys(&TxIsocEPList[epid])) &&
+	    (timeout-- > 0));
+    }
+    break;
+  }
+
+  local_irq_save(flags);
+
+  /* Finish if there is active URB for this endpoint */
+  if(activeUrbList[epid] != NULL) {
+    urb = activeUrbList[epid];
+    urb_priv = urb->hcpriv;
+    ASSERT(urb_priv);
+    tc_warn("Sync finish %s URB:0x%x[%d] (%s %s epid:%d) status:%d %s\n",
+	    (urb == activeUrbList[epid]) ? "active" : "queued",
+	    (unsigned int)urb, urb_priv->urb_num, str_dir(urb->pipe),
+	    str_type(urb->pipe), epid, urb->status,
+	    (urb_priv->later_data) ? "later-sched" : "");
+
+    tc_finish_urb(hcd, activeUrbList[epid], -ENOENT);
+    ASSERT(activeUrbList[epid] == NULL);
+  }
+
+  /* Finish any queued URBs for this endpoint. There won't be any resubmitions
+     because epid_disabled causes enqueue() to fail for this endpoint */
+  while((urb = urb_list_first(epid)) != NULL) {
+    urb_priv = urb->hcpriv;
+    ASSERT(urb_priv);
+
+    tc_warn("Sync finish %s URB:0x%x[%d] (%s %s epid:%d) status:%d %s\n",
+	    (urb == activeUrbList[epid]) ? "active" : "queued",
+	    (unsigned int)urb, urb_priv->urb_num, str_dir(urb->pipe),
+	    str_type(urb->pipe), epid, urb->status,
+	    (urb_priv->later_data) ? "later-sched" : "");
+
+    tc_finish_urb(hcd, urb, -ENOENT);
+  }
+  epid_state[epid].disabled = 0;
+  local_irq_restore(flags);
+}
+
+/* free resources associated with an endpoint (called from hcd_driver) */
+static void tc_endpoint_disable(struct usb_hcd *hcd, 
+				struct usb_host_endpoint *ep) {
+  DBFENTER;
+  /* Only free epid if it has been allocated. We get two endpoint_disable
+     requests for ctrl endpoints so ignore the second one */
+  if(ep->hcpriv != NULL) {
+    struct crisv10_ep_priv *ep_priv = ep->hcpriv;
+    int epid = ep_priv->epid;
+    tc_warn("endpoint_disable ep:0x%x ep-priv:0x%x (%s) (epid:%d freed)\n",
+	   (unsigned int)ep, (unsigned int)ep->hcpriv,
+	   endpoint_to_str(&(ep->desc)), epid);
+
+    tc_sync_finish_epid(hcd, epid);
+
+    ASSERT(activeUrbList[epid] == NULL);
+    ASSERT(list_empty(&urb_list[epid]));
+
+    tc_free_epid(ep);
+  } else {
+    tc_dbg("endpoint_disable ep:0x%x ep-priv:0x%x (%s)\n", (unsigned int)ep,
+	   (unsigned int)ep->hcpriv, endpoint_to_str(&(ep->desc)));
+  }
+  DBFEXIT;
+}
+
+static void tc_finish_urb_later_proc(struct work_struct* work) {
+  unsigned long flags;
+  struct urb_later_data* uld;
+
+  local_irq_save(flags);
+  uld = container_of(work, struct urb_later_data, dws.work);
+  if(uld->urb == NULL) {
+    late_dbg("Later finish of URB = NULL (allready finished)\n");
+  } else {
+    struct crisv10_urb_priv* urb_priv = uld->urb->hcpriv;
+    ASSERT(urb_priv);
+    if(urb_priv->urb_num == uld->urb_num) {
+      late_dbg("Later finish of URB:0x%x[%d]\n", (unsigned int)(uld->urb),
+	       urb_priv->urb_num);
+      if(uld->status != uld->urb->status) {
+	errno_dbg("Later-finish URB with status:%d, later-status:%d\n",
+		  uld->urb->status, uld->status);
+      }
+      if(uld != urb_priv->later_data) {
+	panic("Scheduled uld not same as URBs uld\n");
+      }
+      tc_finish_urb(uld->hcd, uld->urb, uld->status);
+    } else {
+      late_warn("Ignoring later finish of URB:0x%x[%d]"
+		", urb_num doesn't match current URB:0x%x[%d]",
+		(unsigned int)(uld->urb), uld->urb_num,
+		(unsigned int)(uld->urb), urb_priv->urb_num);
+    }
+  }
+  local_irq_restore(flags);
+  kmem_cache_free(later_data_cache, uld);
+}
+
+static void tc_finish_urb_later(struct usb_hcd *hcd, struct urb *urb,
+				int status) {
+  struct crisv10_urb_priv *urb_priv = urb->hcpriv;
+  struct urb_later_data* uld;
+
+  ASSERT(urb_priv);
+
+  if(urb_priv->later_data != NULL) {
+    /* Later-finish allready scheduled for this URB, just update status to
+       return when finishing later */
+    errno_dbg("Later-finish schedule change URB status:%d with new"
+	      " status:%d\n", urb_priv->later_data->status, status);
+    
+    urb_priv->later_data->status = status;
+    return;
+  }
+
+  uld = kmem_cache_alloc(later_data_cache, GFP_ATOMIC);
+  ASSERT(uld);
+
+  uld->hcd = hcd;
+  uld->urb = urb;
+  uld->urb_num = urb_priv->urb_num;
+  uld->status = status;
+
+  INIT_DELAYED_WORK(&uld->dws, tc_finish_urb_later_proc);
+  urb_priv->later_data = uld;
+
+  /* Schedule the finishing of the URB to happen later */
+  schedule_delayed_work(&uld->dws, LATER_TIMER_DELAY);
+}
+
+static void tc_finish_isoc_urb(struct usb_hcd *hcd, struct urb *urb,
+			       int status);
+
+static void tc_finish_urb(struct usb_hcd *hcd, struct urb *urb, int status) {
+  struct crisv10_hcd* crisv10_hcd = hcd_to_crisv10_hcd(hcd);
+  struct crisv10_urb_priv *urb_priv = urb->hcpriv;
+  int epid;
+  char toggle;
+  int urb_num;
+
+  DBFENTER;
+  ASSERT(urb_priv != NULL);
+  epid = urb_priv->epid;
+  urb_num = urb_priv->urb_num;
+
+  if(urb != activeUrbList[epid]) {
+    if(urb_list_entry(urb, epid)) {
+      /* Remove this URB from the list. Only happens when URB are finished
+	 before having been processed (dequeing) */
+      urb_list_del(urb, epid);
+    } else {
+      tc_warn("Finishing of URB:0x%x[%d] neither active or in queue for"
+	      " epid:%d\n", (unsigned int)urb, urb_num, epid);
+    }
+  }
+
+  /* Cancel any pending later-finish of this URB */
+  if(urb_priv->later_data) {
+    urb_priv->later_data->urb = NULL;
+  }
+
+  /* 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. */
+    if (status == 0 && urb->status == -EINPROGRESS) {
+      urb->actual_length = urb->transfer_buffer_length;
+    } else {
+      /*  We wouldn't know of any partial writes if there was an error. */
+      urb->actual_length = 0;
+    }
+  }
+
+
+  /* URB status mangling */
+  if(urb->status == -EINPROGRESS) {
+    /* The USB core hasn't changed the status, let's set our finish status */
+    urb->status = status;
+
+    if ((status == 0) && (urb->transfer_flags & URB_SHORT_NOT_OK) &&
+	usb_pipein(urb->pipe) &&
+	(urb->actual_length != urb->transfer_buffer_length)) {
+      /* URB_SHORT_NOT_OK means that short reads (shorter than the endpoint's
+	 max length) is to be treated as an error. */
+      errno_dbg("Finishing URB:0x%x[%d] with SHORT_NOT_OK flag and short"
+		" data:%d\n", (unsigned int)urb, urb_num,
+		urb->actual_length);
+      urb->status = -EREMOTEIO;
+    }
+
+    if(urb_priv->urb_state == UNLINK) {
+      /* URB has been requested to be unlinked asynchronously */
+      urb->status = -ECONNRESET;
+      errno_dbg("Fixing unlink status of URB:0x%x[%d] to:%d\n",
+		(unsigned int)urb, urb_num, urb->status);
+    }
+  } else {
+    /* The USB Core wants to signal some error via the URB, pass it through */
+  }
+
+  /* use completely different finish function for Isoc URBs */
+  if(usb_pipeisoc(urb->pipe)) {
+    tc_finish_isoc_urb(hcd, urb, status);
+    return;
+  }
+
+  /* Do special unlinking of EPs for Intr traffic */
+  if(usb_pipeint(urb->pipe)) {
+    tc_dma_unlink_intr_urb(urb);
+  }
+
+  /* Release allocated bandwidth for periodic transfers */
+  if(usb_pipeint(urb->pipe) || usb_pipeisoc(urb->pipe))
+    crisv10_usb_release_bandwidth(hcd,
+                                  usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS,
+                                  urb_priv->bandwidth);
+
+  /* This URB is active on EP */
+  if(urb == activeUrbList[epid]) {
+    /* We need to fiddle with the toggle bits because the hardware doesn't do
+       it for us. */
+    toggle = etrax_epid_get_toggle(epid, usb_pipeout(urb->pipe));
+    usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+		  usb_pipeout(urb->pipe), toggle);
+
+    /* Checks for Ctrl and Bulk EPs */
+    switch(usb_pipetype(urb->pipe)) {
+    case PIPE_BULK:
+      /* Check so Bulk EP realy is disabled before finishing active URB  */
+      ASSERT((TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) ==
+	     IO_STATE(USB_EP_command, enable, no));
+      /* Disable sub-pointer for EP to avoid next tx_interrupt() to
+	 process Bulk EP. */
+      TxBulkEPList[epid].sub = 0;
+      /* 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]);
+      break;
+    case PIPE_CONTROL:
+      /* Check so Ctrl EP realy is disabled before finishing active URB  */
+      ASSERT((TxCtrlEPList[epid].command & IO_MASK(USB_EP_command, enable)) ==
+	     IO_STATE(USB_EP_command, enable, no));
+      /* Disable sub-pointer for EP to avoid next tx_interrupt() to
+	 process Ctrl EP. */
+      TxCtrlEPList[epid].sub = 0;
+      break;
+    }
+  }
+
+  /* Free HC-private URB data*/
+  urb_priv_free(hcd, urb);
+
+  if(urb->status) {
+    errno_dbg("finish_urb (URB:0x%x[%d] %s %s) (data:%d) status:%d\n",
+	      (unsigned int)urb, urb_num, str_dir(urb->pipe),
+	      str_type(urb->pipe), urb->actual_length, urb->status);
+  } else {
+    tc_dbg("finish_urb (URB:0x%x[%d] %s %s) (data:%d) status:%d\n",
+	   (unsigned int)urb, urb_num, str_dir(urb->pipe),
+	   str_type(urb->pipe), urb->actual_length, urb->status);
+  }
+
+  /* If we just finished an active URB, clear active pointer. */
+  if (urb == activeUrbList[epid]) {
+    /* Make URB not active on EP anymore */
+    activeUrbList[epid] = NULL;
+
+    if(urb->status == 0) {
+      /* URB finished sucessfully, process queue to see if there are any more
+	 URBs waiting before we call completion function.*/
+      if(crisv10_hcd->running) {
+	/* Only process queue if USB controller is running */
+	tc_dma_process_queue(epid);
+      } else {
+	tc_warn("No processing of queue for epid:%d, USB Controller not"
+		" running\n", epid);
+      }
+    }
+  }
+
+  /*  Hand the URB from HCD to its USB device driver, using its completion
+      functions */
+  usb_hcd_giveback_urb (hcd, urb, status);
+
+  /* Check the queue once more if the URB returned with error, because we
+     didn't do it before the completion function because the specification
+     states that the queue should not restart until all it's unlinked
+     URBs have been fully retired, with the completion functions run */
+  if(crisv10_hcd->running) {
+    /* Only process queue if USB controller is running */
+    tc_dma_process_queue(epid);
+  } else {
+    tc_warn("No processing of queue for epid:%d, USB Controller not running\n",
+	    epid);
+  }
+
+  DBFEXIT;
+}
+
+static void tc_finish_isoc_urb(struct usb_hcd *hcd, struct urb *urb,
+			       int status) {
+  struct crisv10_urb_priv *urb_priv = urb->hcpriv;
+  int epid, i;
+  volatile int timeout = 10000;
+  int bandwidth = 0;
+
+  ASSERT(urb_priv);
+  epid = urb_priv->epid;
+
+  ASSERT(usb_pipeisoc(urb->pipe));
+
+  /* Set 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;
+  }
+
+  /* Check if the URB is currently active (done or error) */
+  if(urb == activeUrbList[epid]) {
+    /* Check if there are another In Isoc URB queued for this epid */
+    if (!list_empty(&urb_list[epid])&& !epid_state[epid].disabled) {
+      /* Move it from queue to active and mark it started so Isoc transfers
+	 won't be interrupted.
+	 All Isoc URBs data transfers are already added to DMA lists so we
+	 don't have to insert anything in DMA lists here. */
+      activeUrbList[epid] = urb_list_first(epid);
+      ((struct crisv10_urb_priv *)(activeUrbList[epid]->hcpriv))->urb_state =
+	STARTED;
+      urb_list_del(activeUrbList[epid], epid);
+
+      if(urb->status) {
+	errno_dbg("finish_isoc_urb (URB:0x%x[%d] %s %s) (%d of %d packets)"
+		  " status:%d, new waiting URB:0x%x[%d]\n",
+		  (unsigned int)urb, urb_priv->urb_num, str_dir(urb->pipe),
+		  str_type(urb->pipe), urb_priv->isoc_packet_counter,
+		  urb->number_of_packets, urb->status,
+		  (unsigned int)activeUrbList[epid],
+		  ((struct crisv10_urb_priv *)(activeUrbList[epid]->hcpriv))->urb_num);
+      }
+
+    } else { /* No other URB queued for this epid */
+      if(urb->status) {
+	errno_dbg("finish_isoc_urb (URB:0x%x[%d] %s %s) (%d of %d packets)"
+		  " status:%d, no new URB waiting\n",
+		  (unsigned int)urb, urb_priv->urb_num, str_dir(urb->pipe),
+		  str_type(urb->pipe), urb_priv->isoc_packet_counter,
+		  urb->number_of_packets, urb->status);
+      }
+
+      /* Check if EP is still enabled, then shut it down. */
+      if (TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
+	isoc_dbg("Isoc EP enabled for epid:%d, disabling it\n", epid);
+
+	/* Should only occur for In Isoc EPs where SB isn't consumed. */
+	ASSERT(usb_pipein(urb->pipe));
+
+	/* Disable it and wait for it to stop */
+	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])) &&
+	      (timeout-- > 0));
+      }
+
+      /* Unlink SB to say that epid is finished. */
+      TxIsocEPList[epid].sub = 0;
+      TxIsocEPList[epid].hw_len = 0;
+
+      /* No URB active for EP anymore */
+      activeUrbList[epid] = NULL;
+    }
+  } else { /* Finishing of not active URB (queued up with SBs thought) */
+    isoc_warn("finish_isoc_urb (URB:0x%x %s) (%d of %d packets) status:%d,"
+	      " SB queued but not active\n",
+	      (unsigned int)urb, str_dir(urb->pipe),
+	      urb_priv->isoc_packet_counter, urb->number_of_packets,
+	      urb->status);
+    if(usb_pipeout(urb->pipe)) {
+      /* Finishing of not yet active Out Isoc URB needs unlinking of SBs. */
+      struct USB_SB_Desc *iter_sb, *prev_sb, *next_sb;
+
+      iter_sb = TxIsocEPList[epid].sub ?
+	phys_to_virt(TxIsocEPList[epid].sub) : 0;
+      prev_sb = 0;
+
+      /* SB that is linked before this URBs first SB */
+      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. */
+	isoc_dbg("Isoc urb not found, already sent?\n");
+	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;
+      }
+    }
+  }
+
+  /* Free HC-private URB data*/
+  bandwidth = urb_priv->bandwidth;
+  urb_priv_free(hcd, urb);
+
+  crisv10_usb_release_bandwidth(hcd, usb_pipeisoc(urb->pipe), bandwidth);
+
+  /*  Hand the URB from HCD to its USB device driver, using its completion
+      functions */
+  usb_hcd_giveback_urb (hcd, urb, status);
+}
+
+static __u32 urb_num = 0;
+
+/* allocate and initialize URB private data */
+static int urb_priv_create(struct usb_hcd *hcd, struct urb *urb, int epid,
+			   int mem_flags) {
+  struct crisv10_urb_priv *urb_priv;
+  
+  urb_priv = kmalloc(sizeof *urb_priv, mem_flags);
+  if (!urb_priv)
+    return -ENOMEM;
+  memset(urb_priv, 0, sizeof *urb_priv);
+
+  urb_priv->epid = epid;
+  urb_priv->urb_state = NOT_STARTED;
+
+  urb->hcpriv = urb_priv;
+  /* Assign URB a sequence number, and increment counter */
+  urb_priv->urb_num = urb_num;
+  urb_num++;
+  urb_priv->bandwidth = 0;
+  return 0;
+}
+
+/* free URB private data */
+static void urb_priv_free(struct usb_hcd *hcd, struct urb *urb) {
+  int i;
+  struct crisv10_urb_priv *urb_priv = urb->hcpriv;
+  ASSERT(urb_priv != 0);
+
+  /* Check it has any SBs linked that needs to be freed*/
+  if(urb_priv->first_sb != NULL) {
+    struct USB_SB_Desc *next_sb, *first_sb, *last_sb;
+    int i = 0;
+    first_sb = urb_priv->first_sb;
+    last_sb = urb_priv->last_sb;
+    ASSERT(last_sb);
+    while(first_sb != last_sb) {
+      next_sb = (struct USB_SB_Desc *)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++;
+  }
+
+  /* Check if it has any EPs in its Intr pool that also needs to be freed */
+  if(urb_priv->intr_ep_pool_length > 0) {
+    for(i = 0; i < urb_priv->intr_ep_pool_length; i++) {
+      kfree(urb_priv->intr_ep_pool[i]);
+    }
+    /*
+    tc_dbg("Freed %d EPs from URB:0x%x EP pool\n",
+	     urb_priv->intr_ep_pool_length, (unsigned int)urb);
+    */
+  }
+
+  kfree(urb_priv);
+  urb->hcpriv = NULL;
+}
+
+static int ep_priv_create(struct usb_host_endpoint *ep, int mem_flags) {
+  struct crisv10_ep_priv *ep_priv;
+  
+  ep_priv = kmalloc(sizeof *ep_priv, mem_flags);
+  if (!ep_priv)
+    return -ENOMEM;
+  memset(ep_priv, 0, sizeof *ep_priv);
+
+  ep->hcpriv = ep_priv;
+  return 0;
+}
+
+static void ep_priv_free(struct usb_host_endpoint *ep) {
+  struct crisv10_ep_priv *ep_priv = ep->hcpriv;
+  ASSERT(ep_priv);
+  kfree(ep_priv);
+  ep->hcpriv = NULL;
+}
+
+/*
+ * usb_check_bandwidth():
+ *
+ * old_alloc is from host_controller->bandwidth_allocated in microseconds;
+ * bustime is from calc_bus_time(), but converted to microseconds.
+ *
+ * returns <bustime in us> if successful,
+ * or -ENOSPC if bandwidth request fails.
+ *
+ * FIXME:
+ * This initial implementation does not use Endpoint.bInterval
+ * in managing bandwidth allocation.
+ * It probably needs to be expanded to use Endpoint.bInterval.
+ * This can be done as a later enhancement (correction).
+ *
+ * This will also probably require some kind of
+ * frame allocation tracking...meaning, for example,
+ * that if multiple drivers request interrupts every 10 USB frames,
+ * they don't all have to be allocated at
+ * frame numbers N, N+10, N+20, etc.  Some of them could be at
+ * N+11, N+21, N+31, etc., and others at
+ * N+12, N+22, N+32, etc.
+ *
+ * Similarly for isochronous transfers...
+ *
+ * Individual HCDs can schedule more directly ... this logic
+ * is not correct for high speed transfers.
+ */
+static int crisv10_usb_check_bandwidth(
+  struct usb_device *dev,
+  struct urb *urb)
+{
+  unsigned int	pipe = urb->pipe;
+  long					bustime;
+  int						is_in = usb_pipein (pipe);
+  int						is_iso = usb_pipeisoc (pipe);
+  int						old_alloc = dev->bus->bandwidth_allocated;
+  int						new_alloc;
+
+  bustime = NS_TO_US (usb_calc_bus_time (dev->speed, is_in, is_iso,
+                                         usb_maxpacket (dev, pipe, !is_in)));
+  if (is_iso)
+    bustime /= urb->number_of_packets;
+
+  new_alloc = old_alloc + (int) bustime;
+  if (new_alloc > FRAME_TIME_MAX_USECS_ALLOC) {
+    dev_dbg (&dev->dev, "usb_check_bandwidth FAILED: %d + %ld = %d usec\n",
+             old_alloc, bustime, new_alloc);
+    bustime = -ENOSPC;      /* report error */
+  }
+
+  return bustime;
+}
+
+/**
+ * usb_claim_bandwidth - records bandwidth for a periodic transfer
+ * @dev: source/target of request
+ * @urb: request (urb->dev == dev)
+ * @bustime: bandwidth consumed, in (average) microseconds per frame
+ * @isoc: true iff the request is isochronous
+ *
+ * HCDs are expected not to overcommit periodic bandwidth, and to record such
+ * reservations whenever endpoints are added to the periodic schedule.
+ *
+ * FIXME averaging per-frame is suboptimal.  Better to sum over the HCD's
+ * entire periodic schedule ... 32 frames for OHCI, 1024 for UHCI, settable
+ * for EHCI (256/512/1024 frames, default 1024) and have the bus expose how
+ * large its periodic schedule is.
+ */
+static void crisv10_usb_claim_bandwidth(
+  struct usb_device *dev,
+  struct urb *urb, int bustime, int isoc)
+{
+  dev->bus->bandwidth_allocated += bustime;
+  if (isoc)
+    dev->bus->bandwidth_isoc_reqs++;
+  else
+    dev->bus->bandwidth_int_reqs++;
+  struct crisv10_urb_priv *urb_priv;
+  urb_priv = urb->hcpriv;
+  urb_priv->bandwidth = bustime;
+}
+
+/**
+ * usb_release_bandwidth - reverses effect of usb_claim_bandwidth()
+ * @hcd: host controller
+ * @isoc: true iff the request is isochronous
+ * @bandwidth: bandwidth returned
+ *
+ * This records that previously allocated bandwidth has been released.
+ * Bandwidth is released when endpoints are removed from the host controller's
+ * periodic schedule.
+ */
+static void crisv10_usb_release_bandwidth(
+  struct usb_hcd *hcd,
+  int isoc,
+  int bandwidth)
+{
+  hcd_to_bus(hcd)->bandwidth_allocated -= bandwidth;
+  if (isoc)
+    hcd_to_bus(hcd)->bandwidth_isoc_reqs--;
+  else
+    hcd_to_bus(hcd)->bandwidth_int_reqs--;
+}
+
+
+/* EPID handling functions, managing EP-list in Etrax through wrappers */
+/* ------------------------------------------------------------------- */
+
+/* Sets up a new EPID for an endpoint or returns existing if found */
+static int tc_setup_epid(struct usb_host_endpoint *ep, struct urb *urb,
+			 int mem_flags) {
+  int epid;
+  char devnum, endpoint, out_traffic, slow;
+  int maxlen;
+  __u32 epid_data;
+  struct crisv10_ep_priv *ep_priv = ep->hcpriv;
+  
+  DBFENTER;
+  
+  /* Check if a valid epid already is setup for this endpoint */
+  if(ep_priv != NULL) {
+    return ep_priv->epid;
+  }
+
+  /* We must find and initiate a new epid for this urb. */
+  epid = tc_allocate_epid();
+  
+  if (epid == -1) {
+    /* Failed to allocate a new epid. */
+    DBFEXIT;
+    return epid;
+  }
+  
+  /* We now have a new epid to use. Claim it. */
+  epid_state[epid].inuse = 1;
+  
+  /* Init private data for new endpoint */
+  if(ep_priv_create(ep, mem_flags) != 0) {
+    return -ENOMEM;
+  }
+  ep_priv = ep->hcpriv;
+  ep_priv->epid = epid;
+
+  devnum = usb_pipedevice(urb->pipe);
+  endpoint = usb_pipeendpoint(urb->pipe);
+  slow = (urb->dev->speed == USB_SPEED_LOW);
+  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);
+  }
+    
+  if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
+    epid_data = 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);
+    etrax_epid_iso_set(epid, epid_data);
+  } else {
+    epid_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);
+    etrax_epid_set(epid, epid_data);
+  }
+  
+  epid_state[epid].out_traffic = out_traffic;
+  epid_state[epid].type = usb_pipetype(urb->pipe);
+
+  tc_warn("Setting up ep:0x%x epid:%d (addr:%d endp:%d max_len:%d %s %s %s)\n",
+	  (unsigned int)ep, epid, devnum, endpoint, maxlen,
+	  str_type(urb->pipe), out_traffic ? "out" : "in",
+	  slow ? "low" : "full");
+
+  /* Enable Isoc eof interrupt if we set up the first Isoc epid */
+  if(usb_pipeisoc(urb->pipe)) {
+    isoc_epid_counter++;
+    if(isoc_epid_counter == 1) {
+      isoc_warn("Enabled Isoc eof interrupt\n");
+      *R_USB_IRQ_MASK_SET = IO_STATE(R_USB_IRQ_MASK_SET, iso_eof, set);
+    }
+  }
+
+  DBFEXIT;
+  return epid;
+}
+
+static void tc_free_epid(struct usb_host_endpoint *ep) {
+  unsigned long flags;
+  struct crisv10_ep_priv *ep_priv = ep->hcpriv;
+  int epid;
+  volatile int timeout = 10000;
+
+  DBFENTER;
+
+  if (ep_priv == NULL) {
+    tc_warn("Trying to free unused epid on ep:0x%x\n", (unsigned int)ep);
+    DBFEXIT;
+    return;
+  }
+
+  epid = ep_priv->epid;
+
+  /* Disable Isoc eof interrupt if we free the last Isoc epid */
+  if(epid_isoc(epid)) {
+    ASSERT(isoc_epid_counter > 0);
+    isoc_epid_counter--;
+    if(isoc_epid_counter == 0) {
+      *R_USB_IRQ_MASK_CLR = IO_STATE(R_USB_IRQ_MASK_CLR, iso_eof, clr);
+      isoc_warn("Disabled Isoc eof interrupt\n");
+    }
+  }
+
+  /* Take lock manualy instead of in epid_x_x wrappers,
+     because we need to be polling here */
+  spin_lock_irqsave(&etrax_epid_lock, flags);
+  
+  *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)) &&
+	(timeout-- > 0));
+  /* This will, among other things, set the valid field to 0. */
+  *R_USB_EPT_DATA = 0;
+  spin_unlock_irqrestore(&etrax_epid_lock, flags);
+  
+  /* Free resource in software state info list */
+  epid_state[epid].inuse = 0;
+
+  /* Free private endpoint data */
+  ep_priv_free(ep);
+  
+  DBFEXIT;
+}
+
+static int tc_allocate_epid(void) {
+  int i;
+  DBFENTER;
+  for (i = 0; i < NBR_OF_EPIDS; i++) {
+    if (!epid_inuse(i)) {
+      DBFEXIT;
+      return i;
+    }
+  }
+  
+  tc_warn("Found no free epids\n");
+  DBFEXIT;
+  return -1;
+}
+
+
+/* Wrappers around the list functions (include/linux/list.h). */
+/* ---------------------------------------------------------- */
+static inline int __urb_list_empty(int epid) {
+  int retval;
+  retval = list_empty(&urb_list[epid]);
+  return retval;
+}
+
+/* Returns first urb for this epid, or NULL if list is empty. */
+static inline struct urb *urb_list_first(int epid) {
+  unsigned long flags;
+  struct urb *first_urb = 0;
+  spin_lock_irqsave(&urb_list_lock, flags);
+  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;
+  }
+  spin_unlock_irqrestore(&urb_list_lock, flags);
+  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, int mem_flags) {
+  unsigned long flags;
+  urb_entry_t *urb_entry = (urb_entry_t *)kmalloc(sizeof(urb_entry_t), mem_flags);
+  ASSERT(urb_entry);
+  
+  urb_entry->urb = urb;
+  spin_lock_irqsave(&urb_list_lock, flags);
+  list_add_tail(&urb_entry->list, &urb_list[epid]);
+  spin_unlock_irqrestore(&urb_list_lock, flags);
+}
+
+/* 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.)
+   Should be protected by spin_locks in calling function */
+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;
+}
+
+/* Same function as above but for global use. Protects list by spinlock */
+static inline urb_entry_t *urb_list_entry(struct urb *urb, int epid) {
+  unsigned long flags;
+  urb_entry_t *urb_entry;
+  spin_lock_irqsave(&urb_list_lock, flags);
+  urb_entry = __urb_list_entry(urb, epid);
+  spin_unlock_irqrestore(&urb_list_lock, flags);
+  return (urb_entry);
+}
+
+/* Delete an urb from the list. */
+static inline void urb_list_del(struct urb *urb, int epid) {
+  unsigned long flags;
+  urb_entry_t *urb_entry;
+
+  /* Delete entry and free. */
+  spin_lock_irqsave(&urb_list_lock, flags);
+  urb_entry = __urb_list_entry(urb, epid);
+  ASSERT(urb_entry);
+
+  list_del(&urb_entry->list);
+  spin_unlock_irqrestore(&urb_list_lock, flags);
+  kfree(urb_entry);
+}
+
+/* Move an urb to the end of the list. */
+static inline void urb_list_move_last(struct urb *urb, int epid) {
+  unsigned long flags;
+  urb_entry_t *urb_entry;
+  
+  spin_lock_irqsave(&urb_list_lock, flags);
+  urb_entry = __urb_list_entry(urb, epid);
+  ASSERT(urb_entry);
+
+  list_del(&urb_entry->list);
+  list_add_tail(&urb_entry->list, &urb_list[epid]);
+  spin_unlock_irqrestore(&urb_list_lock, flags);
+}
+
+/* Get the next urb in the list. */
+static inline struct urb *urb_list_next(struct urb *urb, int epid) {
+  unsigned long flags;
+  urb_entry_t *urb_entry;
+
+  spin_lock_irqsave(&urb_list_lock, flags);
+  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);
+    spin_unlock_irqrestore(&urb_list_lock, flags);
+    return urb_entry->urb;
+  } else {
+    spin_unlock_irqrestore(&urb_list_lock, flags);
+    return NULL;
+  }
+}
+
+struct USB_EP_Desc* create_ep(int epid, struct USB_SB_Desc* sb_desc,
+			      int mem_flags) {
+  struct USB_EP_Desc *ep_desc;
+  ep_desc = (struct USB_EP_Desc *) kmem_cache_alloc(usb_desc_cache, mem_flags);
+  if(ep_desc == NULL)
+    return NULL;
+  memset(ep_desc, 0, sizeof(struct USB_EP_Desc));
+
+  ep_desc->hw_len = 0;
+  ep_desc->command = (IO_FIELD(USB_EP_command, epid, epid) |
+		      IO_STATE(USB_EP_command, enable, yes));
+  if(sb_desc == NULL) {
+    ep_desc->sub = 0;
+  } else {
+    ep_desc->sub = virt_to_phys(sb_desc);
+  }
+  return ep_desc;
+}
+
+#define TT_ZOUT  0
+#define TT_IN    1
+#define TT_OUT   2
+#define TT_SETUP 3
+
+#define CMD_EOL  IO_STATE(USB_SB_command, eol, yes)
+#define CMD_INTR IO_STATE(USB_SB_command, intr, yes)
+#define CMD_FULL IO_STATE(USB_SB_command, full, yes)
+
+/* Allocation and setup of a generic SB. Used to create SETUP, OUT and ZOUT
+   SBs. Also used by create_sb_in() to avoid same allocation procedure at two
+   places */
+struct USB_SB_Desc* create_sb(struct USB_SB_Desc* sb_prev, int tt, void* data,
+			      int datalen, int mem_flags) {
+  struct USB_SB_Desc *sb_desc;
+  sb_desc = (struct USB_SB_Desc*)kmem_cache_alloc(usb_desc_cache, mem_flags);
+  if(sb_desc == NULL)
+    return NULL;
+  memset(sb_desc, 0, sizeof(struct USB_SB_Desc));
+
+  sb_desc->command = IO_FIELD(USB_SB_command, tt, tt) |
+                     IO_STATE(USB_SB_command, eot, yes);
+
+  sb_desc->sw_len = datalen;
+  if(data != NULL) {
+    sb_desc->buf = virt_to_phys(data);
+  } else {
+    sb_desc->buf = 0;
+  }
+  if(sb_prev != NULL) {
+    sb_prev->next = virt_to_phys(sb_desc);
+  }
+  return sb_desc;
+}
+
+/* Creates a copy of an existing SB by allocation space for it and copy
+   settings */
+struct USB_SB_Desc* create_sb_copy(struct USB_SB_Desc* sb_orig, int mem_flags) {
+  struct USB_SB_Desc *sb_desc;
+  sb_desc = (struct USB_SB_Desc*)kmem_cache_alloc(usb_desc_cache, mem_flags);
+  if(sb_desc == NULL)
+    return NULL;
+
+  memcpy(sb_desc, sb_orig, sizeof(struct USB_SB_Desc));
+  return sb_desc;
+}
+
+/* A specific create_sb function for creation of in SBs. This is due to
+   that datalen in In SBs shows how many packets we are expecting. It also
+   sets up the rem field to show if how many bytes we expect in last packet
+   if it's not a full one */
+struct USB_SB_Desc* create_sb_in(struct USB_SB_Desc* sb_prev, int datalen,
+				 int maxlen, int mem_flags) {
+  struct USB_SB_Desc *sb_desc;
+  sb_desc = create_sb(sb_prev, TT_IN, NULL,
+		      datalen ? (datalen - 1) / maxlen + 1 : 0, mem_flags);
+  if(sb_desc == NULL)
+    return NULL;
+  sb_desc->command |= IO_FIELD(USB_SB_command, rem, datalen % maxlen);
+  return sb_desc;
+}
+
+void set_sb_cmds(struct USB_SB_Desc *sb_desc, __u16 flags) {
+  sb_desc->command |= flags;
+}
+
+int create_sb_for_urb(struct urb *urb, int mem_flags) {
+  int is_out = !usb_pipein(urb->pipe);
+  int type = usb_pipetype(urb->pipe);
+  int maxlen = usb_maxpacket(urb->dev, urb->pipe, is_out);
+  int buf_len = urb->transfer_buffer_length;
+  void *buf = buf_len > 0 ? urb->transfer_buffer : NULL;
+  struct USB_SB_Desc *sb_desc = NULL;
+
+  struct crisv10_urb_priv *urb_priv = (struct crisv10_urb_priv *)urb->hcpriv;
+  ASSERT(urb_priv != NULL);
+
+  switch(type) {
+  case PIPE_CONTROL:
+    /* Setup stage */
+    sb_desc = create_sb(NULL, TT_SETUP, urb->setup_packet, 8, mem_flags);
+    if(sb_desc == NULL)
+      return -ENOMEM;
+    set_sb_cmds(sb_desc, CMD_FULL);
+
+    /* Attach first SB to URB */
+    urb_priv->first_sb = sb_desc;    
+
+    if (is_out) { /* Out Control URB */
+      /* If this Control OUT transfer has an optional data stage we add
+	 an OUT token before the mandatory IN (status) token */
+      if ((buf_len > 0) && buf) {
+	sb_desc = create_sb(sb_desc, TT_OUT, buf, buf_len, mem_flags);
+	if(sb_desc == NULL)
+	  return -ENOMEM;
+	set_sb_cmds(sb_desc, CMD_FULL);
+      }
+
+      /* Status stage */
+      /* The data length has to be exactly 1. This is due to a requirement
+         of the USB specification that a host must be prepared to receive
+         data in the status phase */
+      sb_desc = create_sb(sb_desc, TT_IN, NULL, 1, mem_flags);
+      if(sb_desc == NULL)
+	return -ENOMEM;
+    } else { /* In control URB */
+      /* Data stage */
+      sb_desc = create_sb_in(sb_desc, buf_len, maxlen, mem_flags);
+      if(sb_desc == NULL)
+	return -ENOMEM;
+
+      /* Status stage */
+      /* Read comment at zout_buffer declaration for an explanation to this. */
+      sb_desc = create_sb(sb_desc, TT_ZOUT, &zout_buffer[0], 1, mem_flags);
+      if(sb_desc == NULL)
+	return -ENOMEM;
+      /* Set descriptor interrupt flag for in URBs so we can finish URB after
+         zout-packet has been sent */
+      set_sb_cmds(sb_desc, CMD_INTR | CMD_FULL);
+    }
+    /* Set end-of-list flag in last SB */
+    set_sb_cmds(sb_desc, CMD_EOL);
+    /* Attach last SB to URB */
+    urb_priv->last_sb = sb_desc;
+    break;
+
+  case PIPE_BULK:
+    if (is_out) { /* Out Bulk URB */
+      sb_desc = create_sb(NULL, TT_OUT, buf, buf_len, mem_flags);
+      if(sb_desc == NULL)
+	return -ENOMEM;
+      /* 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)) {
+	set_sb_cmds(sb_desc, CMD_FULL);
+      }
+    } else { /* In Bulk URB */
+      sb_desc = create_sb_in(NULL, buf_len, maxlen, mem_flags);
+      if(sb_desc == NULL)
+	return -ENOMEM;
+    }
+    /* Set end-of-list flag for last SB */
+    set_sb_cmds(sb_desc, CMD_EOL);
+
+    /* Attach SB to URB */
+    urb_priv->first_sb = sb_desc;
+    urb_priv->last_sb = sb_desc;
+    break;
+
+  case PIPE_INTERRUPT:
+    if(is_out) { /* Out Intr URB */
+      sb_desc = create_sb(NULL, TT_OUT, buf, buf_len, mem_flags);
+      if(sb_desc == NULL)
+	return -ENOMEM;
+
+      /* 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)) {
+	set_sb_cmds(sb_desc, CMD_FULL);
+      }
+      /* Only generate TX interrupt if it's a Out URB*/
+      set_sb_cmds(sb_desc, CMD_INTR);
+
+    } else { /* In Intr URB */
+      sb_desc = create_sb_in(NULL, buf_len, maxlen, mem_flags);
+      if(sb_desc == NULL)
+	return -ENOMEM;
+    }
+    /* Set end-of-list flag for last SB */
+    set_sb_cmds(sb_desc, CMD_EOL);
+
+    /* Attach SB to URB */
+    urb_priv->first_sb = sb_desc;
+    urb_priv->last_sb = sb_desc;
+
+    break;
+  case PIPE_ISOCHRONOUS:
+    if(is_out) { /* Out Isoc URB */
+      int i;
+      if(urb->number_of_packets == 0) {
+	tc_err("Can't create SBs for Isoc URB with zero packets\n");
+	return -EPIPE;
+      }
+      /* 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 > 0) {
+
+	  sb_desc = create_sb(sb_desc, TT_OUT, urb->transfer_buffer +
+			      urb->iso_frame_desc[i].offset,
+			      urb->iso_frame_desc[i].length, mem_flags);
+	  if(sb_desc == NULL)
+	    return -ENOMEM;
+
+	  /* Check if it's a full length packet */
+	  if (urb->iso_frame_desc[i].length ==
+	      usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe))) {
+	    set_sb_cmds(sb_desc, CMD_FULL);
+	  }
+	  
+	} else { /* zero length packet */
+	  sb_desc = create_sb(sb_desc, TT_ZOUT, &zout_buffer[0], 1, mem_flags);
+	  if(sb_desc == NULL)
+	    return -ENOMEM;
+	  set_sb_cmds(sb_desc, CMD_FULL);
+	}
+	/* Attach first SB descriptor to URB */
+	if (i == 0) {
+	  urb_priv->first_sb = sb_desc;
+	}
+      }
+      /* Set interrupt and end-of-list flags in last SB */
+      set_sb_cmds(sb_desc, CMD_INTR | CMD_EOL);
+      /* Attach last SB descriptor to URB */
+      urb_priv->last_sb = sb_desc;
+      tc_dbg("Created %d out SBs for Isoc URB:0x%x\n",
+	       urb->number_of_packets, (unsigned int)urb);
+    } else { /* In Isoc URB */
+      /* Actual number of packets is not relevant for periodic in traffic as
+	 long as it is more than zero.  Set to 1 always. */
+      sb_desc = create_sb(sb_desc, TT_IN, NULL, 1, mem_flags);
+      if(sb_desc == NULL)
+	return -ENOMEM;
+      /* Set end-of-list flags for SB */
+      set_sb_cmds(sb_desc, CMD_EOL);
+
+      /* Attach SB to URB */
+      urb_priv->first_sb = sb_desc;
+      urb_priv->last_sb = sb_desc;
+    }
+    break;
+  default:
+    tc_err("Unknown pipe-type\n");
+    return -EPIPE;
+    break;
+  }
+  return 0;
+}
+
+int init_intr_urb(struct urb *urb, int mem_flags) {
+  struct crisv10_urb_priv *urb_priv = (struct crisv10_urb_priv *)urb->hcpriv;
+  struct USB_EP_Desc* ep_desc;
+  int interval;
+  int i;
+  int ep_count;
+
+  ASSERT(urb_priv != NULL);
+  ASSERT(usb_pipeint(urb->pipe));
+  /* We can't support interval longer than amount of eof descriptors in
+     TxIntrEPList */
+  if(urb->interval > MAX_INTR_INTERVAL) {
+    tc_err("Interrupt interval %dms too big (max: %dms)\n", urb->interval,
+	   MAX_INTR_INTERVAL);
+    return -EINVAL;
+  }
+
+  /* We assume that the SB descriptors already have been setup */
+  ASSERT(urb_priv->first_sb != NULL);
+
+  /* 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. */
+  interval = urb->interval;
+  for (i = 0; interval; i++) {
+    interval = interval >> 1;
+  }
+  urb_priv->interval = 1 << (i - 1);
+
+  /* We can only have max interval for Out Interrupt due to that we can only
+     handle one linked in EP for a certain epid in the Intr descr array at the
+     time. The USB Controller in the Etrax 100LX continues to process Intr EPs
+     so we have no way of knowing which one that caused the actual transfer if
+     we have several linked in. */
+  if(usb_pipeout(urb->pipe)) {
+    urb_priv->interval = MAX_INTR_INTERVAL;
+  }
+
+  /* Calculate amount of EPs needed */
+  ep_count = MAX_INTR_INTERVAL / urb_priv->interval;
+
+  for(i = 0; i < ep_count; i++) {
+    ep_desc = create_ep(urb_priv->epid, urb_priv->first_sb, mem_flags);
+    if(ep_desc == NULL) {
+      /* Free any descriptors that we may have allocated before failure */
+      while(i > 0) {
+	i--;
+	kfree(urb_priv->intr_ep_pool[i]);
+      }
+      return -ENOMEM;
+    }
+    urb_priv->intr_ep_pool[i] = ep_desc;
+  }
+  urb_priv->intr_ep_pool_length = ep_count;
+  return 0;
+}
+
+/* DMA RX/TX functions */
+/* ----------------------- */
+
+static void tc_dma_init_rx_list(void) {
+  int i;
+
+  /* Setup descriptor list except last one */
+  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]);
+    
+  }
+  /* Special handling of last descriptor */
+  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;
+  
+  /* Setup list pointers that show progress in list */
+  myNextRxDesc = &RxDescList[0];
+  myLastRxDesc = &RxDescList[NBR_OF_RX_DESC - 1];
+  
+  flush_etrax_cache();
+  /* Point DMA to first descriptor in list and start it */
+  *R_DMA_CH9_FIRST = virt_to_phys(myNextRxDesc);
+  *R_DMA_CH9_CMD = IO_STATE(R_DMA_CH9_CMD, cmd, start);
+}
+
+
+static void tc_dma_init_tx_bulk_list(void) {
+  int i;
+  volatile struct USB_EP_Desc *epDescr;
+
+  for (i = 0; i < (NBR_OF_EPIDS - 1); i++) {
+    epDescr = &(TxBulkEPList[i]);
+    CHECK_ALIGN(epDescr);
+    epDescr->hw_len = 0;
+    epDescr->command = IO_FIELD(USB_EP_command, epid, i);
+    epDescr->sub = 0;
+    epDescr->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]);
+  }
+
+  /* Special handling of last descr in list, make list circular */
+  epDescr = &TxBulkEPList[i];
+  CHECK_ALIGN(epDescr);
+  epDescr->hw_len = 0;
+  epDescr->command = IO_STATE(USB_EP_command, eol, yes) |
+    IO_FIELD(USB_EP_command, epid, i);
+  epDescr->sub = 0;
+  epDescr->next = virt_to_phys(&TxBulkEPList[0]);
+  
+  /* Init DMA sub-channel pointers to last item in each list */
+  *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); */
+}
+
+static void tc_dma_init_tx_ctrl_list(void) {
+  int i;
+  volatile struct USB_EP_Desc *epDescr;
+
+  for (i = 0; i < (NBR_OF_EPIDS - 1); i++) {
+    epDescr = &(TxCtrlEPList[i]);
+    CHECK_ALIGN(epDescr);
+    epDescr->hw_len = 0;
+    epDescr->command = IO_FIELD(USB_EP_command, epid, i);
+    epDescr->sub = 0;
+    epDescr->next = virt_to_phys(&TxCtrlEPList[i + 1]);
+  }
+  /* Special handling of last descr in list, make list circular */
+  epDescr = &TxCtrlEPList[i];
+  CHECK_ALIGN(epDescr);
+  epDescr->hw_len = 0;
+  epDescr->command = IO_STATE(USB_EP_command, eol, yes) |
+    IO_FIELD(USB_EP_command, epid, i);
+  epDescr->sub = 0;
+  epDescr->next = virt_to_phys(&TxCtrlEPList[0]);
+  
+  /* Init DMA sub-channel pointers to last item in each list */
+  *R_DMA_CH8_SUB1_EP = virt_to_phys(&TxCtrlEPList[i]);
+  /* No point in starting the ctrl channel yet.
+   *R_DMA_CH8_SUB1_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start); */
+}
+
+
+static void tc_dma_init_tx_intr_list(void) {
+  int i;
+
+  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]);
+  }
+
+  /* Special handling of last descr in list, make list circular */
+  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]);
+
+  intr_dbg("Initiated Intr EP descriptor list\n");
+
+
+  /* Connect DMA 8 sub-channel 2 to first in list */
+  *R_DMA_CH8_SUB2_EP = virt_to_phys(&TxIntrEPList[0]);
+}
+
+static void tc_dma_init_tx_isoc_list(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);
+}
+
+static int tc_dma_init(struct usb_hcd *hcd) {
+  tc_dma_init_rx_list();
+  tc_dma_init_tx_bulk_list();
+  tc_dma_init_tx_ctrl_list();
+  tc_dma_init_tx_intr_list();
+  tc_dma_init_tx_isoc_list();
+
+  if (cris_request_dma(USB_TX_DMA_NBR,
+		       "ETRAX 100LX built-in USB (Tx)",
+		       DMA_VERBOSE_ON_ERROR,
+		       dma_usb)) {
+    err("Could not allocate DMA ch 8 for USB");
+    return -EBUSY;
+  }
+ 	
+  if (cris_request_dma(USB_RX_DMA_NBR,
+		       "ETRAX 100LX built-in USB (Rx)",
+		       DMA_VERBOSE_ON_ERROR,
+		       dma_usb)) {
+    err("Could not allocate DMA ch 9 for USB");
+    return -EBUSY;
+  }
+
+  *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);
+
+  if (request_irq(ETRAX_USB_RX_IRQ, tc_dma_rx_interrupt, 0,
+		  "ETRAX 100LX built-in USB (Rx)", hcd)) {
+    err("Could not allocate IRQ %d for USB", ETRAX_USB_RX_IRQ);
+    return -EBUSY;
+  }
+  
+  if (request_irq(ETRAX_USB_TX_IRQ, tc_dma_tx_interrupt, 0,
+		  "ETRAX 100LX built-in USB (Tx)", hcd)) {
+    err("Could not allocate IRQ %d for USB", ETRAX_USB_TX_IRQ);
+    return -EBUSY;
+  }
+
+  return 0;
+}
+
+static void tc_dma_destroy(void) {
+  free_irq(ETRAX_USB_RX_IRQ, NULL);
+  free_irq(ETRAX_USB_TX_IRQ, NULL);
+
+  cris_free_dma(USB_TX_DMA_NBR, "ETRAX 100LX built-in USB (Tx)");
+  cris_free_dma(USB_RX_DMA_NBR, "ETRAX 100LX built-in USB (Rx)");
+
+}
+
+static void tc_dma_link_intr_urb(struct urb *urb);
+
+/* Handle processing of Bulk, Ctrl and Intr queues */
+static void tc_dma_process_queue(int epid) {
+  struct urb *urb;
+  struct crisv10_urb_priv *urb_priv;
+  unsigned long flags;
+  char toggle;
+
+  if(epid_state[epid].disabled) {
+    /* Don't process any URBs on a disabled endpoint */
+    return;
+  }
+
+  /* Do not disturb us while fiddling with EPs and epids */
+  local_irq_save(flags);
+
+  /* For bulk, Ctrl and Intr can we only have one URB active at a time for
+     a specific EP. */
+  if(activeUrbList[epid] != NULL) {
+    /* An URB is already active on EP, skip checking queue */
+    local_irq_restore(flags);
+    return;
+  }
+
+  urb = urb_list_first(epid);
+  if(urb == NULL) {
+    /* No URB waiting in EP queue. Nothing do to */
+    local_irq_restore(flags);
+    return;
+  }
+
+  urb_priv = urb->hcpriv;
+  ASSERT(urb_priv != NULL);
+  ASSERT(urb_priv->urb_state == NOT_STARTED);
+  ASSERT(!usb_pipeisoc(urb->pipe));
+
+  /* Remove this URB from the queue and move it to active */
+  activeUrbList[epid] = urb;
+  urb_list_del(urb, epid);
+
+  urb_priv->urb_state = STARTED;
+
+  /* Reset error counters (regardless of which direction this traffic is). */
+  etrax_epid_clear_error(epid);
+
+  /* Special handling of Intr EP lists */
+  if(usb_pipeint(urb->pipe)) {
+    tc_dma_link_intr_urb(urb);
+    local_irq_restore(flags);
+    return;
+  }
+
+  /* Software must preset the toggle bits for Bulk and Ctrl */
+  if(usb_pipecontrol(urb->pipe)) {
+    /* Toggle bits are initialized only during setup transaction in a
+       CTRL transfer */
+    etrax_epid_set_toggle(epid, 0, 0);
+    etrax_epid_set_toggle(epid, 1, 0);
+  } else {
+    toggle = usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+			   usb_pipeout(urb->pipe));
+    etrax_epid_set_toggle(epid, usb_pipeout(urb->pipe), toggle);
+  }
+
+  tc_dbg("Added SBs from (URB:0x%x %s %s) to epid %d: %s\n",
+	 (unsigned int)urb, str_dir(urb->pipe), str_type(urb->pipe), epid,
+	 sblist_to_str(urb_priv->first_sb));
+
+  /* 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. */
+  switch(usb_pipetype(urb->pipe)) {
+  case PIPE_BULK:
+    /* Assert that the EP descriptor is disabled. */
+    ASSERT(!(TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)));
+
+    /* Set up and enable the EP descriptor. */
+    TxBulkEPList[epid].sub = virt_to_phys(urb_priv->first_sb);
+    TxBulkEPList[epid].hw_len = 0;
+    TxBulkEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
+
+    /* Check if the dummy list is already with us (if several urbs were queued). */
+    if (usb_pipein(urb->pipe) && (TxBulkEPList[epid].next != virt_to_phys(&TxBulkDummyEPList[epid][0]))) {
+      tc_dbg("Inviting dummy list to the party for urb 0x%lx, epid %d", 
+	     (unsigned long)urb, epid);
+      
+      /* 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]);
+    }
+
+    restart_dma8_sub0();
+
+    /* 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);
+    break;
+  case PIPE_CONTROL:
+    /* 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(urb_priv->first_sb);
+    TxCtrlEPList[epid].hw_len = 0;
+    TxCtrlEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
+
+    *R_DMA_CH8_SUB1_CMD = IO_STATE(R_DMA_CH8_SUB1_CMD, cmd, start);
+    break;
+  }
+  local_irq_restore(flags);
+}
+
+static void tc_dma_link_intr_urb(struct urb *urb) {
+  struct crisv10_urb_priv *urb_priv = urb->hcpriv;
+  volatile struct USB_EP_Desc *tmp_ep;
+  struct USB_EP_Desc *ep_desc;
+  int i = 0, epid;
+  int pool_idx = 0;
+
+  ASSERT(urb_priv != NULL);
+  epid = urb_priv->epid;
+  ASSERT(urb_priv->interval > 0);
+  ASSERT(urb_priv->intr_ep_pool_length > 0);
+
+  tmp_ep = &TxIntrEPList[0];
+
+  /* Only insert one EP descriptor in list for Out Intr URBs.
+     We can only handle Out Intr with interval of 128ms because
+     it's not possible to insert several Out Intr EPs because they
+     are not consumed by the DMA. */
+  if(usb_pipeout(urb->pipe)) {
+    ep_desc = urb_priv->intr_ep_pool[0];
+    ASSERT(ep_desc);
+    ep_desc->next = tmp_ep->next;
+    tmp_ep->next = virt_to_phys(ep_desc);
+    i++;
+  } else {
+    /* Loop through Intr EP descriptor list and insert EP for URB at
+       specified interval */
+    do {
+      /* Each EP descriptor with eof flag sat signals a new frame */
+      if (tmp_ep->command & IO_MASK(USB_EP_command, eof)) {
+	/* Insert a EP from URBs EP pool at correct interval */
+	if ((i % urb_priv->interval) == 0) {
+	  ep_desc = urb_priv->intr_ep_pool[pool_idx];
+	  ASSERT(ep_desc);
+	  ep_desc->next = tmp_ep->next;
+	  tmp_ep->next = virt_to_phys(ep_desc);
+	  pool_idx++;
+	  ASSERT(pool_idx <= urb_priv->intr_ep_pool_length);
+	}
+	i++;
+      }
+      tmp_ep = (struct USB_EP_Desc *)phys_to_virt(tmp_ep->next);
+    } while(tmp_ep != &TxIntrEPList[0]);
+  }
+
+  intr_dbg("Added SBs to intr epid %d: %s interval:%d (%d EP)\n", epid,
+	   sblist_to_str(urb_priv->first_sb), urb_priv->interval, pool_idx);
+
+  /* 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);
+}
+
+static void tc_dma_process_isoc_urb(struct urb *urb) {
+  unsigned long flags;
+  struct crisv10_urb_priv *urb_priv = urb->hcpriv;
+  int epid;
+
+  /* Do not disturb us while fiddling with EPs and epids */
+  local_irq_save(flags);
+
+  ASSERT(urb_priv);
+  ASSERT(urb_priv->first_sb);
+  epid = urb_priv->epid;
+
+  if(activeUrbList[epid] == NULL) {
+    /* EP is idle, so make this URB active */
+    activeUrbList[epid] = urb;
+    urb_list_del(urb, epid);
+    ASSERT(TxIsocEPList[epid].sub == 0);
+    ASSERT(!(TxIsocEPList[epid].command &
+	     IO_STATE(USB_EP_command, enable, yes)));
+
+    /* Differentiate between In and Out Isoc. Because In SBs are not consumed*/
+    if(usb_pipein(urb->pipe)) {
+    /* Each EP for In Isoc will have only one SB descriptor, setup when
+       submitting the first active urb. We do it here by copying from URBs
+       pre-allocated SB. */
+      memcpy((void *)&(TxIsocSBList[epid]), urb_priv->first_sb,
+	     sizeof(TxIsocSBList[epid]));
+      TxIsocEPList[epid].hw_len = 0;
+      TxIsocEPList[epid].sub = virt_to_phys(&(TxIsocSBList[epid]));
+    } else {
+      /* For Out Isoc we attach the pre-allocated list of SBs for the URB */
+      TxIsocEPList[epid].hw_len = 0;
+      TxIsocEPList[epid].sub = virt_to_phys(urb_priv->first_sb);
+
+      isoc_dbg("Attached first URB:0x%x[%d] to epid:%d first_sb:0x%x"
+	       " last_sb::0x%x\n",
+	       (unsigned int)urb, urb_priv->urb_num, epid,
+	       (unsigned int)(urb_priv->first_sb),
+	       (unsigned int)(urb_priv->last_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;
+      isoc_dbg("URB_ISO_ASAP set, urb->start_frame set to %d\n",
+	       urb->start_frame);
+    } else {
+      /* Not started yet. */
+      urb_priv->urb_state = NOT_STARTED;
+      isoc_warn("urb_priv->urb_state set to NOT_STARTED for URB:0x%x\n",
+		(unsigned int)urb);
+    }
+
+  } else {
+    /* An URB is already active on the EP. Leave URB in queue and let
+       finish_isoc_urb process it after current active URB */
+    ASSERT(TxIsocEPList[epid].sub != 0);
+
+    if(usb_pipein(urb->pipe)) {
+      /* Because there already is a active In URB on this epid we do nothing
+         and the finish_isoc_urb() function will handle switching to next URB*/
+
+    } else { /* For Out Isoc, insert new URBs traffic last in SB-list. */
+      struct USB_SB_Desc *temp_sb_desc;
+
+      /* Set state STARTED to all Out Isoc URBs added to SB list because we
+         don't know how many of them that are finished before descr interrupt*/
+      urb_priv->urb_state = STARTED;
+
+      /* Find end of current SB list by looking for SB with eol flag sat */
+      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);
+      }
+
+      isoc_dbg("Appended URB:0x%x[%d] (first:0x%x last:0x%x) to epid:%d"
+	       " sub:0x%x eol:0x%x\n",
+	       (unsigned int)urb, urb_priv->urb_num,
+	       (unsigned int)(urb_priv->first_sb),
+	       (unsigned int)(urb_priv->last_sb), epid,
+	       (unsigned int)phys_to_virt(TxIsocEPList[epid].sub),
+	       (unsigned int)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))) {
+	__u32 epid_data;
+	/* 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. */
+	epid_data = etrax_epid_iso_get(epid);
+	if (IO_EXTRACT(R_USB_EPT_DATA, error_code, epid_data) !=
+	    IO_STATE_VALUE(R_USB_EPT_DATA, error_code, no_error)) {
+	  isoc_err("Disabled Isoc EP with error:%d on epid:%d when appending"
+		   " URB:0x%x[%d]\n",
+		   IO_EXTRACT(R_USB_EPT_DATA, error_code, epid_data), epid,
+		   (unsigned int)urb, urb_priv->urb_num);
+	}
+
+	/* 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. */
+
+	  if(virt_to_phys(temp_sb_desc) == TxIsocEPList[epid].sub) {
+	    isoc_dbg("EP for epid:%d stoped at SB:0x%x before newly inserted"
+		     ", restarting from this URBs SB:0x%x\n",
+		     epid, (unsigned int)temp_sb_desc,
+		     (unsigned int)(urb_priv->first_sb));
+	    TxIsocEPList[epid].hw_len = 0;
+	    TxIsocEPList[epid].sub = virt_to_phys(urb_priv->first_sb);
+	    urb->start_frame = (*R_USB_FM_NUMBER & 0x7ff);
+	    /* Enable the EP again so data gets processed this time */
+	    TxIsocEPList[epid].command |=
+	      IO_STATE(USB_EP_command, enable, yes);
+
+	  } else {
+	    /* The EP has been disabled but not at end this URB (god knows
+	       where). This should generate an epid_attn so we should not be
+	       here */
+	    isoc_warn("EP was disabled on sb:0x%x before SB list for"
+		     " URB:0x%x[%d] got processed\n",
+		     (unsigned int)phys_to_virt(TxIsocEPList[epid].sub),
+		     (unsigned int)urb, urb_priv->urb_num);
+	  }
+	} else {
+	  /* This might happend if we are slow on this function and isn't
+	     an error. */
+	  isoc_dbg("EP was disabled and finished with SBs from appended"
+		   " URB:0x%x[%d]\n", (unsigned int)urb, urb_priv->urb_num);
+	}
+      }
+    }
+  }
+  
+  /* Start the DMA sub channel */
+  *R_DMA_CH8_SUB3_CMD = IO_STATE(R_DMA_CH8_SUB3_CMD, cmd, start);
+
+  local_irq_restore(flags);
+}
+
+static void tc_dma_unlink_intr_urb(struct urb *urb) {
+  struct crisv10_urb_priv *urb_priv = urb->hcpriv;
+  volatile struct USB_EP_Desc *first_ep;  /* First EP in the list. */
+  volatile struct USB_EP_Desc *curr_ep;   /* Current EP, the iterator. */
+  volatile struct USB_EP_Desc *next_ep;   /* The EP after current. */
+  volatile struct USB_EP_Desc *unlink_ep; /* The one we should remove from
+					     the list. */
+  int count = 0;
+  volatile int timeout = 10000;
+  int epid;
+
+  /* Read 8.8.4 in Designer's Reference, "Removing an EP Descriptor from the
+     List". */
+  ASSERT(urb_priv);
+  ASSERT(urb_priv->intr_ep_pool_length > 0);
+  epid = urb_priv->epid;
+
+  /* First disable all Intr EPs belonging to epid for this URB */
+  first_ep = &TxIntrEPList[0];
+  curr_ep = first_ep;
+  do {
+    next_ep = (struct USB_EP_Desc *)phys_to_virt(curr_ep->next);
+    if (IO_EXTRACT(USB_EP_command, epid, next_ep->command) == epid) {
+      /* Disable EP */
+      next_ep->command &= ~IO_MASK(USB_EP_command, enable);
+    }
+    curr_ep = phys_to_virt(curr_ep->next);
+  } while (curr_ep != first_ep);
+
+
+  /* Now unlink all EPs belonging to this epid from Descr list */
+  first_ep = &TxIntrEPList[0];
+  curr_ep = first_ep;
+  do {
+    next_ep = (struct USB_EP_Desc *)phys_to_virt(curr_ep->next);
+    if (IO_EXTRACT(USB_EP_command, epid, next_ep->command) == 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)) &&
+	    (timeout-- > 0));
+
+      count++;
+    }
+    curr_ep = phys_to_virt(curr_ep->next);
+  } while (curr_ep != first_ep);
+
+  if(count != urb_priv->intr_ep_pool_length) {
+    intr_warn("Unlinked %d of %d Intr EPs for URB:0x%x[%d]\n", count,
+	      urb_priv->intr_ep_pool_length, (unsigned int)urb,
+	      urb_priv->urb_num);
+  } else {
+    intr_dbg("Unlinked %d of %d interrupt EPs for URB:0x%x\n", count,
+	     urb_priv->intr_ep_pool_length, (unsigned int)urb);
+  }
+}
+
+static void check_finished_bulk_tx_epids(struct usb_hcd *hcd,
+						    int timer) {
+  unsigned long flags;
+  int epid;
+  struct urb *urb;
+  struct crisv10_urb_priv * urb_priv;
+  __u32 epid_data;
+
+  /* Protect TxEPList */
+  local_irq_save(flags);
+
+  for (epid = 0; epid < NBR_OF_EPIDS; epid++) {
+    /* A finished EP descriptor is disabled and has a valid sub pointer */
+    if (!(TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) &&
+	(TxBulkEPList[epid].sub != 0)) {
+
+      /* Get the active URB for this epid */
+      urb = activeUrbList[epid];
+      /* Sanity checks */
+      ASSERT(urb);
+      urb_priv = (struct crisv10_urb_priv *)urb->hcpriv;
+      ASSERT(urb_priv);
+      
+      /* Only handle finished out Bulk EPs here,
+	 and let RX interrupt take care of the rest */
+      if(!epid_out_traffic(epid)) {
+	continue;
+      }
+
+      if(timer) {
+	tc_warn("Found finished %s Bulk epid:%d URB:0x%x[%d] from timeout\n",
+		epid_out_traffic(epid) ? "Out" : "In", epid, (unsigned int)urb,
+		urb_priv->urb_num);
+      } else {
+	tc_dbg("Found finished %s Bulk epid:%d URB:0x%x[%d] from interrupt\n",
+	       epid_out_traffic(epid) ? "Out" : "In", epid, (unsigned int)urb,
+	       urb_priv->urb_num);
+      }
+
+      if(urb_priv->urb_state == UNLINK) {
+	/* This Bulk URB is requested to be unlinked, that means that the EP
+	   has been disabled and we might not have sent all data */
+	tc_finish_urb(hcd, urb, urb->status);
+	continue;
+      }
+
+      ASSERT(urb_priv->urb_state == STARTED);
+      if (phys_to_virt(TxBulkEPList[epid].sub) != urb_priv->last_sb) {
+	tc_err("Endpoint got disabled before reaching last sb\n");
+      }
+	
+      epid_data = etrax_epid_get(epid);
+      if (IO_EXTRACT(R_USB_EPT_DATA, error_code, epid_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. */
+	tc_finish_urb(hcd, urb, 0);
+      } else {
+	/* Shouldn't happen. We expect errors to be caught by epid
+	   attention. */
+	tc_err("Found disabled bulk EP desc (epid:%d error:%d)\n",
+	       epid, IO_EXTRACT(R_USB_EPT_DATA, error_code, epid_data));
+      }
+    } else {
+      tc_dbg("Ignoring In Bulk epid:%d, let RX interrupt handle it\n", epid);
+    }
+  }
+
+  local_irq_restore(flags);
+}
+
+static void check_finished_ctrl_tx_epids(struct usb_hcd *hcd) {
+  unsigned long flags;
+  int epid;
+  struct urb *urb;
+  struct crisv10_urb_priv * urb_priv;
+  __u32 epid_data;
+
+  /* Protect TxEPList */
+  local_irq_save(flags);
+
+  for (epid = 0; epid < NBR_OF_EPIDS; epid++) {
+    if(epid == DUMMY_EPID)
+      continue;
+
+    /* A finished EP descriptor is disabled and has a valid sub pointer */
+    if (!(TxCtrlEPList[epid].command & IO_MASK(USB_EP_command, enable)) &&
+	(TxCtrlEPList[epid].sub != 0)) {
+      
+      /* Get the active URB for this epid */
+      urb = activeUrbList[epid];
+
+      if(urb == NULL) {
+	tc_warn("Found finished Ctrl epid:%d with no active URB\n", epid);
+	continue;
+      }
+      
+      /* Sanity checks */
+      ASSERT(usb_pipein(urb->pipe));
+      urb_priv = (struct crisv10_urb_priv *)urb->hcpriv;
+      ASSERT(urb_priv);
+      if (phys_to_virt(TxCtrlEPList[epid].sub) != urb_priv->last_sb) {
+	tc_err("Endpoint got disabled before reaching last sb\n");
+      }
+
+      epid_data = etrax_epid_get(epid);
+      if (IO_EXTRACT(R_USB_EPT_DATA, error_code, epid_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. */
+
+	/* Check if RX-interrupt for In Ctrl has been processed before
+	   finishing the URB */
+	if(urb_priv->ctrl_rx_done) {
+	  tc_dbg("Finishing In Ctrl URB:0x%x[%d] in tx_interrupt\n",
+		 (unsigned int)urb, urb_priv->urb_num);
+	  tc_finish_urb(hcd, urb, 0);
+	} else {
+	  /* If we get zout descriptor interrupt before RX was done for a
+	     In Ctrl transfer, then we flag that and it will be finished
+	     in the RX-Interrupt */
+	  urb_priv->ctrl_zout_done = 1;
+	  tc_dbg("Got zout descr interrupt before RX interrupt\n");
+	}
+      } else {
+	/* Shouldn't happen. We expect errors to be caught by epid
+	   attention. */
+	tc_err("Found disabled Ctrl EP desc (epid:%d URB:0x%x[%d]) error_code:%d\n", epid, (unsigned int)urb, urb_priv->urb_num, IO_EXTRACT(R_USB_EPT_DATA, error_code, epid_data));
+	__dump_ep_desc(&(TxCtrlEPList[epid]));
+	__dump_ept_data(epid);
+      }      
+    }
+  }
+  local_irq_restore(flags);
+}
+
+/* This function goes through all epids that are setup for Out Isoc transfers
+   and marks (isoc_out_done) all queued URBs that the DMA has finished
+   transfer for.
+   No URB completetion is done here to make interrupt routine return quickly.
+   URBs are completed later with help of complete_isoc_bottom_half() that
+   becomes schedules when this functions is finished. */
+static void check_finished_isoc_tx_epids(void) {
+  unsigned long flags;
+  int epid;
+  struct urb *urb;
+  struct crisv10_urb_priv * urb_priv;
+  struct USB_SB_Desc* sb_desc;
+  int epid_done;
+
+  /* Protect TxIsocEPList */
+  local_irq_save(flags);
+
+  for (epid = 0; epid < NBR_OF_EPIDS; epid++) {
+    if (TxIsocEPList[epid].sub == 0 || epid == INVALID_EPID ||
+	!epid_out_traffic(epid)) {
+      /* Nothing here to see. */
+      continue;
+    }
+    ASSERT(epid_inuse(epid));
+    ASSERT(epid_isoc(epid));
+
+    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);
+
+    isoc_dbg("Descr IRQ checking epid:%d sub:0x%x intr:0x%x\n",
+	     epid, (unsigned int)phys_to_virt(TxIsocEPList[epid].sub),
+	     (unsigned int)sb_desc);
+
+    urb = activeUrbList[epid];
+    if(urb == NULL) {
+      isoc_err("Isoc Descr irq on epid:%d with no active URB\n", epid);
+      continue;
+    }
+
+    epid_done = 0;
+    while(urb && !epid_done) {
+      /* Sanity check. */
+      ASSERT(usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS);
+      ASSERT(usb_pipeout(urb->pipe));
+      
+      urb_priv = (struct crisv10_urb_priv *)urb->hcpriv;
+      ASSERT(urb_priv);
+      ASSERT(urb_priv->urb_state == STARTED ||
+	     urb_priv->urb_state == UNLINK);
+      
+      if (sb_desc != urb_priv->last_sb) {
+	/* This urb has been sent. */
+	urb_priv->isoc_out_done = 1;
+
+      } else { /* Found URB that has last_sb as the interrupt reason */
+
+	/* Check if EP has been disabled, meaning that all transfers are done*/
+	if(!(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);
+	  urb_priv->isoc_out_done = 1;
+	} else {
+	  isoc_dbg("Skipping URB:0x%x[%d] because EP not disabled yet\n",
+		   (unsigned int)urb, urb_priv->urb_num);
+	}
+	/* Stop looking any further in queue */
+	epid_done = 1;	
+      }
+
+      if (!epid_done) {
+	if(urb == activeUrbList[epid]) {
+	  urb = urb_list_first(epid);
+	} else {
+	  urb = urb_list_next(urb, epid);
+	}
+      }
+    } /* END: while(urb && !epid_done) */
+  }
+
+  local_irq_restore(flags);
+}
+
+
+/* This is where the Out Isoc URBs are realy completed. This function is
+   scheduled from tc_dma_tx_interrupt() when one or more Out Isoc transfers
+   are done. This functions completes all URBs earlier marked with
+   isoc_out_done by fast interrupt routine check_finished_isoc_tx_epids() */
+
+static void complete_isoc_bottom_half(struct work_struct* work) {
+  struct crisv10_isoc_complete_data *comp_data;
+  struct usb_iso_packet_descriptor *packet;
+  struct crisv10_urb_priv * urb_priv;
+  unsigned long flags;
+  struct urb* urb;
+  int epid_done;
+  int epid;
+  int i;
+
+  comp_data = container_of(work, struct crisv10_isoc_complete_data, usb_bh);
+
+  local_irq_save(flags);
+
+  for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) {
+    if(!epid_inuse(epid) || !epid_isoc(epid) || !epid_out_traffic(epid) || epid == DUMMY_EPID) {
+      /* Only check valid Out Isoc epids */
+      continue;
+    }
+
+    isoc_dbg("Isoc bottom-half checking epid:%d, sub:0x%x\n", epid,
+	     (unsigned int)phys_to_virt(TxIsocEPList[epid].sub));
+
+    /* The descriptor interrupt handler has marked all transmitted Out Isoc
+       URBs with isoc_out_done.  Now we traverse all epids and for all that
+       have out Isoc traffic we traverse its URB list and complete the
+       transmitted URBs. */
+    epid_done = 0;
+    while (!epid_done) {
+
+      /* Get the active urb (if any) */
+      urb = activeUrbList[epid];
+      if (urb == 0) {
+	isoc_dbg("No active URB on epid:%d anymore\n", epid);
+	epid_done = 1;
+	continue;
+      }
+
+      /* Sanity check. */
+      ASSERT(usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS);
+      ASSERT(usb_pipeout(urb->pipe));
+
+      urb_priv = (struct crisv10_urb_priv *)urb->hcpriv;
+      ASSERT(urb_priv);
+
+      if (!(urb_priv->isoc_out_done)) {
+	/* We have reached URB that isn't flaged done yet, stop traversing. */
+	isoc_dbg("Stoped traversing Out Isoc URBs on epid:%d"
+		 " before not yet flaged URB:0x%x[%d]\n",
+		 epid, (unsigned int)urb, urb_priv->urb_num);
+	epid_done = 1;
+	continue;
+      }
+
+      /* This urb has been sent. */
+      isoc_dbg("Found URB:0x%x[%d] that is flaged isoc_out_done\n",
+	       (unsigned int)urb, urb_priv->urb_num);
+
+      /* Set ok on transfered packets for this URB and finish it */
+      for (i = 0; i < urb->number_of_packets; i++) {
+	packet = &urb->iso_frame_desc[i];
+	packet->status = 0;
+	packet->actual_length = packet->length;
+      }
+      urb_priv->isoc_packet_counter = urb->number_of_packets;
+      tc_finish_urb(comp_data->hcd, urb, 0);
+
+    } /* END: while(!epid_done) */
+  } /* END: for(epid...) */
+
+  local_irq_restore(flags);
+  kmem_cache_free(isoc_compl_cache, comp_data);
+}
+
+
+static void check_finished_intr_tx_epids(struct usb_hcd *hcd) {
+  unsigned long flags;
+  int epid;
+  struct urb *urb;
+  struct crisv10_urb_priv * urb_priv;
+  volatile struct USB_EP_Desc *curr_ep;   /* Current EP, the iterator. */
+  volatile struct USB_EP_Desc *next_ep;   /* The EP after current. */
+
+  /* Protect TxintrEPList */
+  local_irq_save(flags);
+
+  for (epid = 0; epid < NBR_OF_EPIDS; epid++) {
+    if(!epid_inuse(epid) || !epid_intr(epid) || !epid_out_traffic(epid)) {
+      /* Nothing to see on this epid. Only check valid Out Intr epids */
+      continue;
+    }
+
+    urb = activeUrbList[epid];
+    if(urb == 0) {
+      intr_warn("Found Out Intr epid:%d with no active URB\n", epid);
+      continue;
+    }
+
+    /* Sanity check. */
+    ASSERT(usb_pipetype(urb->pipe) == PIPE_INTERRUPT);
+    ASSERT(usb_pipeout(urb->pipe));
+    
+    urb_priv = (struct crisv10_urb_priv *)urb->hcpriv;
+    ASSERT(urb_priv);
+
+    /* Go through EPs between first and second sof-EP. It's here Out Intr EPs
+       are inserted.*/
+    curr_ep = &TxIntrEPList[0];
+    do {
+      next_ep = (struct USB_EP_Desc *)phys_to_virt(curr_ep->next);
+      if(next_ep == urb_priv->intr_ep_pool[0]) {
+	/* We found the Out Intr EP for this epid */
+	
+	/* Disable it so it doesn't get processed again */
+	next_ep->command &= ~IO_MASK(USB_EP_command, enable);
+
+	/* Finish the active Out Intr URB with status OK */
+	tc_finish_urb(hcd, urb, 0);
+      }
+      curr_ep = phys_to_virt(curr_ep->next);
+    } while (curr_ep != &TxIntrEPList[1]);
+
+  }
+  local_irq_restore(flags);
+}
+
+/* Interrupt handler for DMA8/IRQ24 with subchannels (called from hardware intr) */
+static irqreturn_t tc_dma_tx_interrupt(int irq, void *vhc) {
+  struct usb_hcd *hcd = (struct usb_hcd*)vhc;
+  ASSERT(hcd);
+
+  if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub0_descr)) {
+    /* Clear this interrupt */
+    *R_DMA_CH8_SUB0_CLR_INTR = IO_STATE(R_DMA_CH8_SUB0_CLR_INTR, clr_descr, do);
+    restart_dma8_sub0();
+  }
+
+  if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub1_descr)) {
+    /* Clear this interrupt */
+    *R_DMA_CH8_SUB1_CLR_INTR = IO_STATE(R_DMA_CH8_SUB1_CLR_INTR, clr_descr, do);
+    check_finished_ctrl_tx_epids(hcd);
+  }
+
+  if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub2_descr)) {
+    /* Clear this interrupt */
+    *R_DMA_CH8_SUB2_CLR_INTR = IO_STATE(R_DMA_CH8_SUB2_CLR_INTR, clr_descr, do);
+    check_finished_intr_tx_epids(hcd);
+  }
+
+  if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub3_descr)) {
+    struct crisv10_isoc_complete_data* comp_data;
+
+    /* Flag done Out Isoc for later completion */
+    check_finished_isoc_tx_epids();
+
+    /* Clear this interrupt */
+    *R_DMA_CH8_SUB3_CLR_INTR = IO_STATE(R_DMA_CH8_SUB3_CLR_INTR, clr_descr, do);
+    /* Schedule bottom half of Out Isoc completion function. This function
+       finishes the URBs marked with isoc_out_done */
+    comp_data = (struct crisv10_isoc_complete_data*)
+      kmem_cache_alloc(isoc_compl_cache, GFP_ATOMIC);
+    ASSERT(comp_data != NULL);
+    comp_data ->hcd = hcd;
+
+    INIT_WORK(&comp_data->usb_bh, complete_isoc_bottom_half);
+    schedule_work(&comp_data->usb_bh);
+  }
+
+  return IRQ_HANDLED;
+}
+
+/* Interrupt handler for DMA9/IRQ25 (called from hardware intr) */
+static irqreturn_t tc_dma_rx_interrupt(int irq, void *vhc) {
+  unsigned long flags;
+  struct urb *urb;
+  struct usb_hcd *hcd = (struct usb_hcd*)vhc;
+  struct crisv10_urb_priv *urb_priv;
+  int epid = 0;
+  int real_error;
+
+  ASSERT(hcd);
+
+  /* Clear this interrupt. */
+  *R_DMA_CH9_CLR_INTR = IO_STATE(R_DMA_CH9_CLR_INTR, clr_eop, do);
+
+  /* Custom clear interrupt for this interrupt */
+  /* The reason we cli here is that we call the driver's callback functions. */
+  local_irq_save(flags);
+
+  /* Note that this while loop assumes that all packets span only
+     one rx descriptor. */
+  while(myNextRxDesc->status & IO_MASK(USB_IN_status, eop)) {
+    epid = IO_EXTRACT(USB_IN_status, epid, myNextRxDesc->status);
+    /* Get the active URB for this epid */
+    urb = activeUrbList[epid];
+
+    ASSERT(epid_inuse(epid));
+    if (!urb) {
+      dma_err("No urb for epid %d in rx interrupt\n", epid);
+      goto skip_out;
+    }
+
+    /* Check if any errors on epid */
+    real_error = 0;
+    if (myNextRxDesc->status & IO_MASK(USB_IN_status, error)) {
+      __u32 r_usb_ept_data;
+
+      if (usb_pipeisoc(urb->pipe)) {
+	r_usb_ept_data = etrax_epid_iso_get(epid);
+	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. Continue processing.
+	  */
+	} else real_error = 1;
+      } else real_error = 1;
+    }
+
+    if(real_error) {
+      dma_err("Error in RX descr on epid:%d for URB 0x%x",
+	      epid, (unsigned int)urb);
+      dump_ept_data(epid);
+      dump_in_desc(myNextRxDesc);
+      goto skip_out;
+    }
+
+    urb_priv = (struct crisv10_urb_priv *)urb->hcpriv;
+    ASSERT(urb_priv);
+    ASSERT(urb_priv->urb_state == STARTED ||
+	   urb_priv->urb_state == UNLINK);
+
+    if ((usb_pipetype(urb->pipe) == PIPE_BULK) ||
+	(usb_pipetype(urb->pipe) == PIPE_CONTROL) ||
+	(usb_pipetype(urb->pipe) == PIPE_INTERRUPT)) {
+
+      /* 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. */
+      if (myNextRxDesc->status & IO_MASK(USB_IN_status, nodata)) {
+	/* No data to copy */
+      } else {
+	/*
+	dma_dbg("Processing RX for URB:0x%x epid:%d (data:%d ofs:%d)\n",
+		(unsigned int)urb, epid, myNextRxDesc->hw_len,
+		urb_priv->rx_offset);
+	*/
+	/* Only copy data if URB isn't flaged to be unlinked*/
+	if(urb_priv->urb_state != UNLINK) {
+	  /* Make sure the data fits in the buffer. */
+	  if(urb_priv->rx_offset + myNextRxDesc->hw_len
+	     <= urb->transfer_buffer_length) {
+
+	    /* Copy the data to URBs buffer */
+	    memcpy(urb->transfer_buffer + urb_priv->rx_offset,
+		   phys_to_virt(myNextRxDesc->buf), myNextRxDesc->hw_len);
+	    urb_priv->rx_offset += myNextRxDesc->hw_len;
+	  } else {
+	    /* Signal overflow when returning URB */
+	    urb->status = -EOVERFLOW;
+	    tc_finish_urb_later(hcd, urb, urb->status);
+	  }
+	}
+      }
+
+      /* Check if it was the last packet in the transfer */
+      if (myNextRxDesc->status & IO_MASK(USB_IN_status, eot)) {
+	/* Special handling for In Ctrl URBs. */
+	if(usb_pipecontrol(urb->pipe) && usb_pipein(urb->pipe) &&
+	   !(urb_priv->ctrl_zout_done)) {
+	  /* Flag that RX part of Ctrl transfer is done. Because zout descr
+	     interrupt hasn't happend yet will the URB be finished in the
+	     TX-Interrupt. */
+	  urb_priv->ctrl_rx_done = 1;
+	  tc_dbg("Not finishing In Ctrl URB:0x%x from rx_interrupt, waiting"
+		 " for zout\n", (unsigned int)urb);
+	} else {
+	  tc_finish_urb(hcd, urb, 0);
+	}
+      }
+    } else { /* ISOC RX */
+      /*
+      isoc_dbg("Processing RX for epid:%d (URB:0x%x) ISOC pipe\n",
+	       epid, (unsigned int)urb);
+      */
+
+      struct usb_iso_packet_descriptor *packet;
+
+      if (urb_priv->urb_state == UNLINK) {
+	isoc_warn("Ignoring Isoc Rx data for urb being unlinked.\n");
+	goto skip_out;
+      } else if (urb_priv->urb_state == NOT_STARTED) {
+	isoc_err("What? Got Rx data for Isoc urb that isn't started?\n");
+	goto skip_out;
+      }
+
+      packet = &urb->iso_frame_desc[urb_priv->isoc_packet_counter];
+      ASSERT(packet);
+      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);
+	if(packet->actual_length > 0)
+	  isoc_dbg("Copied %d bytes, packet %d for URB:0x%x[%d]\n",
+		   packet->actual_length, urb_priv->isoc_packet_counter,
+		   (unsigned int)urb, urb_priv->urb_num);
+      }
+
+      /* 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) {
+	/* Complete the urb with status OK. */
+	tc_finish_urb(hcd, urb, 0);
+      }
+    }
+
+  skip_out:
+    myNextRxDesc->status = 0;
+    myNextRxDesc->command |= IO_MASK(USB_IN_command, eol);
+    myLastRxDesc->command &= ~IO_MASK(USB_IN_command, eol);
+    myLastRxDesc = myNextRxDesc;
+    myNextRxDesc = phys_to_virt(myNextRxDesc->next);
+    flush_etrax_cache();
+    *R_DMA_CH9_CMD = IO_STATE(R_DMA_CH9_CMD, cmd, restart);
+  }
+
+  local_irq_restore(flags);
+
+  return IRQ_HANDLED;
+}
+
+static void tc_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. */
+  
+  if (!(*R_DMA_CH8_SUB0_CMD & IO_MASK(R_DMA_CH8_SUB0_CMD, cmd))) {
+    int epid;
+
+    timer_dbg("bulk_start_timer: Bulk DMA channel not running.\n");
+
+    for (epid = 0; epid < NBR_OF_EPIDS; epid++) {
+      if (TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
+	timer_warn("Found enabled EP for epid %d, starting bulk channel.\n",
+		   epid);
+	restart_dma8_sub0();
+
+	/* 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 {
+    timer_dbg("bulk_start_timer: Bulk DMA channel running.\n");
+  }
+}
+
+static void tc_bulk_eot_timer_func(unsigned long dummy) {
+  struct usb_hcd *hcd = (struct usb_hcd*)dummy;
+  ASSERT(hcd);
+  /* 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. */
+  timer_dbg("bulk_eot_timer timed out.\n");
+  check_finished_bulk_tx_epids(hcd, 1);
+}
+
+
+/*************************************************************/
+/*************************************************************/
+/* Device driver block                                       */
+/*************************************************************/
+/*************************************************************/
+
+/* Forward declarations for device driver functions */
+static int devdrv_hcd_probe(struct device *);
+static int devdrv_hcd_remove(struct device *);
+#ifdef CONFIG_PM
+static int devdrv_hcd_suspend(struct device *, u32, u32);
+static int devdrv_hcd_resume(struct device *, u32);
+#endif /* CONFIG_PM */
+
+/* the device */
+static struct platform_device *devdrv_hc_platform_device;
+
+/* device driver interface */
+static struct device_driver devdrv_hc_device_driver = {
+  .name =			(char *) hc_name,
+  .bus =			&platform_bus_type,
+
+  .probe =		devdrv_hcd_probe,
+  .remove =		devdrv_hcd_remove,
+
+#ifdef CONFIG_PM
+  .suspend =		devdrv_hcd_suspend,
+  .resume =		devdrv_hcd_resume,
+#endif /* CONFIG_PM */
+};
+
+/* initialize the host controller and driver  */
+static int __init_or_module devdrv_hcd_probe(struct device *dev)
+{
+  struct usb_hcd *hcd;
+  struct crisv10_hcd *crisv10_hcd;
+  int retval;
+
+  /* Check DMA burst length */
+  if(IO_EXTRACT(R_BUS_CONFIG, dma_burst, *R_BUS_CONFIG) !=
+     IO_STATE(R_BUS_CONFIG, dma_burst, burst32)) {
+    devdrv_err("Invalid DMA burst length in Etrax 100LX,"
+	       " needs to be 32\n");
+    return -EPERM;
+  }
+  
+  //XXX: dev->usb_id don't exist, using "" instread? - claudio
+  hcd = usb_create_hcd(&crisv10_hc_driver, dev, "");
+  if (!hcd)
+    return -ENOMEM;
+
+  crisv10_hcd = hcd_to_crisv10_hcd(hcd);
+  spin_lock_init(&crisv10_hcd->lock);
+  crisv10_hcd->num_ports = num_ports();
+  crisv10_hcd->running = 0;
+
+  dev_set_drvdata(dev, crisv10_hcd);
+
+  devdrv_dbg("ETRAX USB IRQs HC:%d  RX:%d  TX:%d\n", ETRAX_USB_HC_IRQ,
+	  ETRAX_USB_RX_IRQ, ETRAX_USB_TX_IRQ);
+
+  /* Print out chip version read from registers */
+  int rev_maj = *R_USB_REVISION & IO_MASK(R_USB_REVISION, major);
+  int rev_min = *R_USB_REVISION & IO_MASK(R_USB_REVISION, minor);
+  if(rev_min == 0) {
+    devdrv_info("Etrax 100LX USB Revision %d v1,2\n", rev_maj);
+  } else {
+    devdrv_info("Etrax 100LX USB Revision %d v%d\n", rev_maj, rev_min);
+  }
+
+  devdrv_info("Bulk timer interval, start:%d eot:%d\n",
+	      BULK_START_TIMER_INTERVAL,
+	      BULK_EOT_TIMER_INTERVAL);
+
+
+  /* Init root hub data structures */
+  if(rh_init()) {
+    devdrv_err("Failed init data for Root Hub\n");
+    retval = -ENOMEM;
+  }
+
+  if(port_in_use(0)) {
+    if (cris_request_io_interface(if_usb_1, "ETRAX100LX USB-HCD")) {
+      printk(KERN_CRIT "usb-host: request IO interface usb1 failed");
+      retval = -EBUSY;
+      goto out;
+    }
+    devdrv_info("Claimed interface for USB physical port 1\n");
+  }
+  if(port_in_use(1)) {
+    if (cris_request_io_interface(if_usb_2, "ETRAX100LX USB-HCD")) {
+      /* Free first interface if second failed to be claimed */
+      if(port_in_use(0)) {
+	cris_free_io_interface(if_usb_1);
+      }
+      printk(KERN_CRIT "usb-host: request IO interface usb2 failed");
+      retval = -EBUSY;
+      goto out;
+    }
+    devdrv_info("Claimed interface for USB physical port 2\n");
+  }
+  
+  /* Init transfer controller structs and locks */
+  if((retval = tc_init(hcd)) != 0) {
+    goto out;
+  }
+
+  /* Attach interrupt functions for DMA and init DMA controller */
+  if((retval = tc_dma_init(hcd)) != 0) {
+    goto out;
+  }
+
+  /* Attach the top IRQ handler for USB controller interrupts */
+  if (request_irq(ETRAX_USB_HC_IRQ, crisv10_hcd_top_irq, 0,
+		  "ETRAX 100LX built-in USB (HC)", hcd)) {
+    err("Could not allocate IRQ %d for USB", ETRAX_USB_HC_IRQ);
+    retval = -EBUSY;
+    goto out;
+  }
+
+  /* iso_eof is only enabled 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);
+
+
+  crisv10_ready_wait();
+  /* 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.
+     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);
+
+  crisv10_ready_wait();
+  /* 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);
+
+
+  /* Check so controller not busy before enabling ports */
+  crisv10_ready_wait();
+
+  /* Enable selected USB ports */
+  if(port_in_use(0)) {
+    *R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, no);
+  } else {
+    *R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, yes);
+  }
+  if(port_in_use(1)) {
+    *R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, no);
+  } else {
+    *R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, yes);
+  }
+
+  crisv10_ready_wait();
+  /* 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);
+
+  /* Do not continue probing initialization before USB interface is done */
+  crisv10_ready_wait();
+
+  /* Register our Host Controller to USB Core
+   * Finish the remaining parts of generic HCD initialization: allocate the
+   * buffers of consistent memory, register the bus
+   * and call the driver's reset() and start() routines. */
+  retval = usb_add_hcd(hcd, ETRAX_USB_HC_IRQ, IRQF_DISABLED);
+  if (retval != 0) {
+    devdrv_err("Failed registering HCD driver\n");
+    goto out;
+  }
+
+  return 0;
+
+ out:
+  devdrv_hcd_remove(dev);
+  return retval;
+}
+
+
+/* cleanup after the host controller and driver */
+static int __init_or_module devdrv_hcd_remove(struct device *dev)
+{
+  struct crisv10_hcd *crisv10_hcd = dev_get_drvdata(dev);
+  struct usb_hcd *hcd;
+
+  if (!crisv10_hcd)
+    return 0;
+  hcd = crisv10_hcd_to_hcd(crisv10_hcd);
+
+
+  /* Stop USB Controller in Etrax 100LX */
+  crisv10_hcd_reset(hcd);
+
+  usb_remove_hcd(hcd);
+  devdrv_dbg("Removed HCD from USB Core\n");
+
+  /* Free USB Controller IRQ */
+  free_irq(ETRAX_USB_HC_IRQ, NULL);
+
+  /* Free resources */
+  tc_dma_destroy();
+  tc_destroy();
+
+
+  if(port_in_use(0)) {
+    cris_free_io_interface(if_usb_1);
+  }
+  if(port_in_use(1)) {
+    cris_free_io_interface(if_usb_2);
+  }
+
+  devdrv_dbg("Freed all claimed resources\n");
+
+  return 0;
+}
+
+
+#ifdef	CONFIG_PM
+
+static int devdrv_hcd_suspend(struct usb_hcd *hcd, u32 state, u32 level)
+{
+  return 0; /* no-op for now */
+}
+
+static int devdrv_hcd_resume(struct usb_hcd *hcd, u32 level)
+{
+  return 0; /* no-op for now */
+}
+
+#endif /* CONFIG_PM */
+
+
+/*************************************************************/
+/*************************************************************/
+/* Module block                                              */
+/*************************************************************/
+/*************************************************************/
+ 
+/* register driver */
+static int __init module_hcd_init(void) 
+{
+  
+  if (usb_disabled())
+    return -ENODEV;
+
+  /* Here we select enabled ports by following defines created from
+     menuconfig */
+#ifndef CONFIG_ETRAX_USB_HOST_PORT1
+  ports &= ~(1<<0);
+#endif
+#ifndef CONFIG_ETRAX_USB_HOST_PORT2
+  ports &= ~(1<<1);
+#endif
+
+  printk(KERN_INFO "%s version "VERSION" "COPYRIGHT"\n", product_desc);
+
+  devdrv_hc_platform_device =
+    platform_device_register_simple((char *) hc_name, 0, NULL, 0);
+
+  if (IS_ERR(devdrv_hc_platform_device))
+    return PTR_ERR(devdrv_hc_platform_device);
+  return driver_register(&devdrv_hc_device_driver);
+  /* 
+   * Note that we do not set the DMA mask for the device,
+   * i.e. we pretend that we will use PIO, since no specific
+   * allocation routines are needed for DMA buffers. This will
+   * cause the HCD buffer allocation routines to fall back to
+   * kmalloc().
+   */
+}
+
+/* unregister driver */
+static void __exit module_hcd_exit(void) 
+{	
+  driver_unregister(&devdrv_hc_device_driver);
+}
+
+
+/* Module hooks */
+module_init(module_hcd_init);
+module_exit(module_hcd_exit);
+