USB PCI-OHCI, interrupt pipe and usb event poll support

This patch added USB PCI-OHCI chips support, interrupt pipe support
and usb event poll support. For supporting the USB interrupt pipe, the
globe urb_priv is moved to purb in ed struct. Now, we can process
several urbs at one time. The interrupt pipe support codes are ported
from Linux kernel 2.4.

Signed-off-by: Zhang Wei <wei.zhang@freescale.com>

2 files changed, 267 insertions, 55 deletions

diff --git a/drivers/usb_ohci.c b/drivers/usb_ohci.c
index 70cb6a3..459c809 100644
--- a/drivers/usb_ohci.c
+++ b/drivers/usb_ohci.c
@@ -1,5 +1,11 @@
 /*
- * URB OHCI HCD (Host Controller Driver) for USB on the AT91RM9200.
+ * URB OHCI HCD (Host Controller Driver) for USB on the AT91RM9200 and PCI bus.
+ *
+ * Interrupt support is added. Now, it has been tested
+ * on ULI1575 chip and works well with USB keyboard.
+ *
+ * (C) Copyright 2007
+ * Zhang Wei, Freescale Semiconductor, Inc. <wei.zhang@freescale.com>
  *
  * (C) Copyright 2003
  * Gary Jennejohn, DENX Software Engineering <gj@denx.de>
@@ -35,7 +41,7 @@
  * 1 - you MUST define LITTLEENDIAN in the configuration file for the
  *     board or this driver will NOT work!
  * 2 - this driver is intended for use with USB Mass Storage Devices
- *     (BBB) ONLY. There is NO support for Interrupt or Isochronous pipes!
+ *     (BBB) and USB keyboard. There is NO support for Isochronous pipes!
  * 3 - when running on a PQFP208 AT91RM9200, define CONFIG_AT91C_PQFP_UHPBUG
  *     to activate workaround for bug #41 or this driver will NOT work!
  */
@@ -56,6 +62,8 @@
 # include <asm/arch/pxa-regs.h>
 #elif defined(CONFIG_MPC5200)
 # include <mpc5xxx.h>
+#elif defined(CONFIG_PCI_OHCI)
+# include <pci.h>
 #endif
 
 #include <malloc.h>
@@ -66,6 +74,7 @@
     defined(CONFIG_S3C2400) || \
     defined(CONFIG_S3C2410) || \
     defined(CONFIG_440EP) || \
+    defined(CONFIG_PCI_OHCI) || \
     defined(CONFIG_MPC5200)
 # define OHCI_USE_NPS		/* force NoPowerSwitching mode */
 #endif
@@ -79,12 +88,19 @@
 #define OHCI_CONTROL_INIT \
 	(OHCI_CTRL_CBSR & 0x3) | OHCI_CTRL_IE | OHCI_CTRL_PLE
 
-#define readl(a) (*((vu_long *)(a)))
-#define writel(a, b) (*((vu_long *)(b)) = ((vu_long)a))
+#define readl(a) m32_swap(*((vu_long *)(a)))
+#define writel(a, b) (*((vu_long *)(b)) = m32_swap((vu_long)a))
 
 #define min_t(type,x,y) ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
 
-#undef DEBUG
+#ifdef CONFIG_PCI_OHCI
+static struct pci_device_id ohci_pci_ids[] = {
+	{0x10b9, 0x5237},	/* ULI1575 PCI OHCI module ids */
+	/* Please add supported PCI OHCI controller ids here */
+	{0, 0}
+};
+#endif
+
 #ifdef DEBUG
 #define dbg(format, arg...) printf("DEBUG: " format "\n", ## arg)
 #else
@@ -114,15 +130,11 @@ struct ohci_hcca ghcca[1];
 struct ohci_hcca *phcca;
 /* this allocates EDs for all possible endpoints */
 struct ohci_device ohci_dev;
-/* urb_priv */
-urb_priv_t urb_priv;
 /* RHSC flag */
 int got_rhsc;
 /* device which was disconnected */
 struct usb_device *devgone;
 
-/* flag guarding URB transation */
-int urb_finished = 0;
 
 
 /*-------------------------------------------------------------------------*/
@@ -177,6 +189,7 @@ static void urb_free_priv (urb_priv_t * urb)
 			}
 		}
 	}
+	free(urb);
 }
 
 /*-------------------------------------------------------------------------*/
@@ -187,11 +200,10 @@ static int sohci_get_current_frame_number (struct usb_device * dev);
 /* debug| print the main components of an URB
  * small: 0) header + data packets 1) just header */
 
-static void pkt_print (struct usb_device * dev, unsigned long pipe, void * buffer,
+static void pkt_print (urb_priv_t *purb, struct usb_device * dev,
+	unsigned long pipe, void * buffer,
 	int transfer_len, struct devrequest * setup, char * str, int small)
 {
-	urb_priv_t * purb = &urb_priv;
-
 	dbg("%s URB:[%4x] dev:%2d,ep:%2d-%c,type:%s,len:%d/%d stat:%#lx",
 			str,
 			sohci_get_current_frame_number (dev),
@@ -200,7 +212,7 @@ static void pkt_print (struct usb_device * dev, unsigned long pipe, void * buffe
 			usb_pipeout (pipe)? 'O': 'I',
 			usb_pipetype (pipe) < 2? (usb_pipeint (pipe)? "INTR": "ISOC"):
 				(usb_pipecontrol (pipe)? "CTRL": "BULK"),
-			purb->actual_length,
+			(purb ? purb->actual_length : 0),
 			transfer_len, dev->status);
 #ifdef	OHCI_VERBOSE_DEBUG
 	if (!small) {
@@ -214,10 +226,11 @@ static void pkt_print (struct usb_device * dev, unsigned long pipe, void * buffe
 		}
 		if (transfer_len > 0 && buffer) {
 			printf (__FILE__ ": data(%d/%d):",
-				purb->actual_length,
+				(purb ? purb->actual_length : 0),
 				transfer_len);
 			len = usb_pipeout (pipe)?
-					transfer_len: purb->actual_length;
+					transfer_len:
+					(purb ? purb->actual_length : 0);
 			for (i = 0; i < 16 && i < len; i++)
 				printf (" %02x", ((__u8 *) buffer) [i]);
 			printf ("%s\n", i < len? "...": "");
@@ -413,13 +426,17 @@ static void ohci_dump (ohci_t *controller, int verbose)
 
 /* get a transfer request */
 
-int sohci_submit_job(struct usb_device *dev, unsigned long pipe, void *buffer,
-		int transfer_len, struct devrequest *setup, int interval)
+int sohci_submit_job(urb_priv_t *urb, struct devrequest *setup)
 {
 	ohci_t *ohci;
 	ed_t * ed;
-	urb_priv_t *purb_priv;
+	urb_priv_t *purb_priv = urb;
 	int i, size = 0;
+	struct usb_device *dev = urb->dev;
+	unsigned long pipe = urb->pipe;
+	void *buffer = urb->transfer_buffer;
+	int transfer_len = urb->transfer_buffer_length;
+	int interval = urb->interval;
 
 	ohci = &gohci;
 
@@ -430,18 +447,11 @@ int sohci_submit_job(struct usb_device *dev, unsigned long pipe, void *buffer,
 		return -1;
 	}
 
-	/* if we have an unfinished URB from previous transaction let's
-	 * fail and scream as quickly as possible so as not to corrupt
-	 * further communication */
-	if (!urb_finished) {
-		err("sohci_submit_job: URB NOT FINISHED");
-		return -1;
-	}
 	/* we're about to begin a new transaction here so mark the URB unfinished */
-	urb_finished = 0;
+	urb->finished = 0;
 
 	/* every endpoint has a ed, locate and fill it */
-	if (!(ed = ep_add_ed (dev, pipe))) {
+	if (!(ed = ep_add_ed (dev, pipe, interval, 1))) {
 		err("sohci_submit_job: ENOMEM");
 		return -1;
 	}
@@ -455,13 +465,17 @@ int sohci_submit_job(struct usb_device *dev, unsigned long pipe, void *buffer,
 			size = (transfer_len == 0)? 2:
 						(transfer_len - 1) / 4096 + 3;
 			break;
+		case PIPE_INTERRUPT: /* 1 TD */
+			size = 1;
+			break;
 	}
 
+	ed->purb = urb;
+
 	if (size >= (N_URB_TD - 1)) {
 		err("need %d TDs, only have %d", size, N_URB_TD);
 		return -1;
 	}
-	purb_priv = &urb_priv;
 	purb_priv->pipe = pipe;
 
 	/* fill the private part of the URB */
@@ -497,6 +511,40 @@ int sohci_submit_job(struct usb_device *dev, unsigned long pipe, void *buffer,
 	return 0;
 }
 
+static inline int sohci_return_job(struct ohci *hc, urb_priv_t *urb)
+{
+	struct ohci_regs *regs = hc->regs;
+
+	switch (usb_pipetype (urb->pipe)) {
+	case PIPE_INTERRUPT:
+		/* implicitly requeued */
+		if (urb->dev->irq_handle &&
+				(urb->dev->irq_act_len = urb->actual_length)) {
+			writel (OHCI_INTR_WDH, &regs->intrenable);
+			readl (&regs->intrenable); /* PCI posting flush */
+			urb->dev->irq_handle(urb->dev);
+			writel (OHCI_INTR_WDH, &regs->intrdisable);
+			readl (&regs->intrdisable); /* PCI posting flush */
+		}
+		urb->actual_length = 0;
+		td_submit_job (
+				urb->dev,
+				urb->pipe,
+				urb->transfer_buffer,
+				urb->transfer_buffer_length,
+				NULL,
+				urb,
+				urb->interval);
+		break;
+	case PIPE_CONTROL:
+	case PIPE_BULK:
+		break;
+	default:
+		return 0;
+	}
+	return 1;
+}
+
 /*-------------------------------------------------------------------------*/
 
 #ifdef DEBUG
@@ -514,13 +562,73 @@ static int sohci_get_current_frame_number (struct usb_device *usb_dev)
  * ED handling functions
  *-------------------------------------------------------------------------*/
 
+/* search for the right branch to insert an interrupt ed into the int tree
+ * do some load ballancing;
+ * returns the branch and
+ * sets the interval to interval = 2^integer (ld (interval)) */
+
+static int ep_int_ballance (ohci_t * ohci, int interval, int load)
+{
+	int i, branch = 0;
+
+	/* search for the least loaded interrupt endpoint
+	 * branch of all 32 branches
+	 */
+	for (i = 0; i < 32; i++)
+		if (ohci->ohci_int_load [branch] > ohci->ohci_int_load [i])
+			branch = i;
+
+	branch = branch % interval;
+	for (i = branch; i < 32; i += interval)
+		ohci->ohci_int_load [i] += load;
+
+	return branch;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*  2^int( ld (inter)) */
+
+static int ep_2_n_interval (int inter)
+{
+	int i;
+	for (i = 0; ((inter >> i) > 1 ) && (i < 5); i++);
+	return 1 << i;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* the int tree is a binary tree
+ * in order to process it sequentially the indexes of the branches have to be mapped
+ * the mapping reverses the bits of a word of num_bits length */
+
+static int ep_rev (int num_bits, int word)
+{
+	int i, wout = 0;
+
+	for (i = 0; i < num_bits; i++)
+		wout |= (((word >> i) & 1) << (num_bits - i - 1));
+	return wout;
+}
+
+/*-------------------------------------------------------------------------*
+ * ED handling functions
+ *-------------------------------------------------------------------------*/
+
 /* link an ed into one of the HC chains */
 
 static int ep_link (ohci_t *ohci, ed_t *edi)
 {
 	volatile ed_t *ed = edi;
+	int int_branch;
+	int i;
+	int inter;
+	int interval;
+	int load;
+	__u32 * ed_p;
 
 	ed->state = ED_OPER;
+	ed->int_interval = 0;
 
 	switch (ed->type) {
 	case PIPE_CONTROL:
@@ -554,12 +662,49 @@ static int ep_link (ohci_t *ohci, ed_t *edi)
 		}
 		ohci->ed_bulktail = edi;
 		break;
+
+	case PIPE_INTERRUPT:
+		load = ed->int_load;
+		interval = ep_2_n_interval (ed->int_period);
+		ed->int_interval = interval;
+		int_branch = ep_int_ballance (ohci, interval, load);
+		ed->int_branch = int_branch;
+
+		for (i = 0; i < ep_rev (6, interval); i += inter) {
+			inter = 1;
+			for (ed_p = &(ohci->hcca->int_table[ep_rev (5, i) + int_branch]);
+				(*ed_p != 0) && (((ed_t *)ed_p)->int_interval >= interval);
+				ed_p = &(((ed_t *)ed_p)->hwNextED))
+					inter = ep_rev (6, ((ed_t *)ed_p)->int_interval);
+			ed->hwNextED = *ed_p;
+			*ed_p = m32_swap(ed);
+		}
+		break;
 	}
 	return 0;
 }
 
 /*-------------------------------------------------------------------------*/
 
+/* scan the periodic table to find and unlink this ED */
+static void periodic_unlink ( struct ohci *ohci, volatile struct ed *ed,
+		unsigned index, unsigned period)
+{
+	for (; index < NUM_INTS; index += period) {
+		__u32	*ed_p = &ohci->hcca->int_table [index];
+
+		/* ED might have been unlinked through another path */
+		while (*ed_p != 0) {
+			if (((struct ed *)m32_swap (ed_p)) == ed) {
+				*ed_p = ed->hwNextED;
+				break;
+			}
+			ed_p = & (((struct ed *)m32_swap (ed_p))->hwNextED);
+		}
+	}
+}
+
+
 /* unlink an ed from one of the HC chains.
  * just the link to the ed is unlinked.
  * the link from the ed still points to another operational ed or 0
@@ -568,6 +713,7 @@ static int ep_link (ohci_t *ohci, ed_t *edi)
 static int ep_unlink (ohci_t *ohci, ed_t *edi)
 {
 	volatile ed_t *ed = edi;
+	int i;
 
 	ed->hwINFO |= m32_swap (OHCI_ED_SKIP);
 
@@ -605,6 +751,12 @@ static int ep_unlink (ohci_t *ohci, ed_t *edi)
 			((ed_t *)m32_swap (*((__u32 *)&ed->hwNextED)))->ed_prev = ed->ed_prev;
 		}
 		break;
+
+	case PIPE_INTERRUPT:
+		periodic_unlink (ohci, ed, 0, 1);
+		for (i = ed->int_branch; i < 32; i += ed->int_interval)
+		    ohci->ohci_int_load[i] -= ed->int_load;
+		break;
 	}
 	ed->state = ED_UNLINK;
 	return 0;
@@ -621,7 +773,8 @@ static int ep_unlink (ohci_t *ohci, ed_t *edi)
  * info fields are setted anyway even though most of them should not
  * change
  */
-static ed_t * ep_add_ed (struct usb_device *usb_dev, unsigned long pipe)
+static ed_t * ep_add_ed (struct usb_device *usb_dev, unsigned long pipe,
+		int interval, int load)
 {
 	td_t *td;
 	ed_t *ed_ret;
@@ -654,6 +807,11 @@ static ed_t * ep_add_ed (struct usb_device *usb_dev, unsigned long pipe)
 			| usb_pipeslow (pipe) << 13
 			| usb_maxpacket (usb_dev, pipe) << 16);
 
+	if (ed->type == PIPE_INTERRUPT && ed->state == ED_UNLINK) {
+		ed->int_period = interval;
+		ed->int_load = load;
+	}
+
 	return ed_ret;
 }
 
@@ -768,6 +926,13 @@ static void td_submit_job (struct usb_device *dev, unsigned long pipe, void *buf
 		if (!ohci->sleeping)
 			writel (OHCI_CLF, &ohci->regs->cmdstatus); /* start Control list */
 		break;
+
+	case PIPE_INTERRUPT:
+		info = usb_pipeout (urb->pipe)?
+			TD_CC | TD_DP_OUT | toggle:
+			TD_CC | TD_R | TD_DP_IN | toggle;
+		td_fill (ohci, info, data, data_len, dev, cnt++, urb);
+		break;
 	}
 	if (urb->length != cnt)
 		dbg("TD LENGTH %d != CNT %d", urb->length, cnt);
@@ -783,7 +948,7 @@ static void td_submit_job (struct usb_device *dev, unsigned long pipe, void *buf
 static void dl_transfer_length(td_t * td)
 {
 	__u32 tdINFO, tdBE, tdCBP;
-	urb_priv_t *lurb_priv = &urb_priv;
+	urb_priv_t *lurb_priv = td->ed->purb;
 
 	tdINFO = m32_swap (td->hwINFO);
 	tdBE   = m32_swap (td->hwBE);
@@ -820,7 +985,7 @@ static td_t * dl_reverse_done_list (ohci_t *ohci)
 		td_list = (td_t *)td_list_hc;
 
 		if (TD_CC_GET (m32_swap (td_list->hwINFO))) {
-			lurb_priv = &urb_priv;
+			lurb_priv = td_list->ed->purb;
 			dbg(" USB-error/status: %x : %p",
 					TD_CC_GET (m32_swap (td_list->hwINFO)), td_list);
 			if (td_list->ed->hwHeadP & m32_swap (0x1)) {
@@ -860,10 +1025,10 @@ static int dl_done_list (ohci_t *ohci, td_t *td_list)
 	while (td_list) {
 		td_list_next = td_list->next_dl_td;
 
-		lurb_priv = &urb_priv;
 		tdINFO = m32_swap (td_list->hwINFO);
 
 		ed = td_list->ed;
+		lurb_priv = ed->purb;
 
 		dl_transfer_length(td_list);
 
@@ -882,14 +1047,16 @@ static int dl_done_list (ohci_t *ohci, td_t *td_list)
 			    (lurb_priv->state != URB_DEL))
 #else
 			if ((ed->state & (ED_OPER | ED_UNLINK)))
-				urb_finished = 1;
+#endif
+				lurb_priv->finished = sohci_return_job(ohci,
+						lurb_priv);
 			else
 				dbg("dl_done_list: strange.., ED state %x, ed->state\n");
 		} else
 			dbg("dl_done_list: processing TD %x, len %x\n", lurb_priv->td_cnt,
 				lurb_priv->length);
-#endif
-		if (ed->state != ED_NEW) {
+		if (ed->state != ED_NEW &&
+			  (usb_pipetype (lurb_priv->pipe) != PIPE_INTERRUPT)) {
 			edHeadP = m32_swap (ed->hwHeadP) & 0xfffffff0;
 			edTailP = m32_swap (ed->hwTailP);
 
@@ -1063,8 +1230,7 @@ static int ohci_submit_rh_msg(struct usb_device *dev, unsigned long pipe,
 	__u16 wLength;
 
 #ifdef DEBUG
-urb_priv.actual_length = 0;
-pkt_print(dev, pipe, buffer, transfer_len, cmd, "SUB(rh)", usb_pipein(pipe));
+pkt_print(NULL, dev, pipe, buffer, transfer_len, cmd, "SUB(rh)", usb_pipein(pipe));
 #else
 	wait_ms(1);
 #endif
@@ -1279,9 +1445,7 @@ pkt_print(dev, pipe, buffer, transfer_len, cmd, "SUB(rh)", usb_pipein(pipe));
 	dev->status = stat;
 
 #ifdef DEBUG
-	if (transfer_len)
-		urb_priv.actual_length = transfer_len;
-	pkt_print(dev, pipe, buffer, transfer_len, cmd, "RET(rh)", 0/*usb_pipein(pipe)*/);
+	pkt_print(NULL, dev, pipe, buffer, transfer_len, cmd, "RET(rh)", 0/*usb_pipein(pipe)*/);
 #else
 	wait_ms(1);
 #endif
@@ -1299,6 +1463,16 @@ int submit_common_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
 	int stat = 0;
 	int maxsize = usb_maxpacket(dev, pipe);
 	int timeout;
+	urb_priv_t *urb;
+
+	urb = malloc(sizeof(urb_priv_t));
+	memset(urb, 0, sizeof(urb_priv_t));
+
+	urb->dev = dev;
+	urb->pipe = pipe;
+	urb->transfer_buffer = buffer;
+	urb->transfer_buffer_length = transfer_len;
+	urb->interval = interval;
 
 	/* device pulled? Shortcut the action. */
 	if (devgone == dev) {
@@ -1307,8 +1481,8 @@ int submit_common_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
 	}
 
 #ifdef DEBUG
-	urb_priv.actual_length = 0;
-	pkt_print(dev, pipe, buffer, transfer_len, setup, "SUB", usb_pipein(pipe));
+	urb->actual_length = 0;
+	pkt_print(urb, dev, pipe, buffer, transfer_len, setup, "SUB", usb_pipein(pipe));
 #else
 	wait_ms(1);
 #endif
@@ -1318,7 +1492,7 @@ int submit_common_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
 		return -1;
 	}
 
-	if (sohci_submit_job(dev, pipe, buffer, transfer_len, setup, interval) < 0) {
+	if (sohci_submit_job(urb, setup) < 0) {
 		err("sohci_submit_job failed");
 		return -1;
 	}
@@ -1353,18 +1527,20 @@ int submit_common_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
 		 * finished we need to re-iterate this loop so as
 		 * hc_interrupt() gets called again as there needs to be some
 		 * more TD's to process still */
-		if ((stat >= 0) && (stat != 0xff) && (urb_finished)) {
+		if ((stat >= 0) && (stat != 0xff) && (urb->finished)) {
 			/* 0xff is returned for an SF-interrupt */
 			break;
 		}
 
 		if (--timeout) {
 			wait_ms(1);
+			if (!urb->finished)
+				dbg("\%");
+
 		} else {
 			err("CTL:TIMEOUT ");
 			dbg("submit_common_msg: TO status %x\n", stat);
-			stat = USB_ST_CRC_ERR;
-			urb_finished = 1;
+			urb->finished = 1;
 			stat = USB_ST_CRC_ERR;
 			break;
 		}
@@ -1374,13 +1550,14 @@ int submit_common_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
 	dev->act_len = transfer_len;
 
 #ifdef DEBUG
-	pkt_print(dev, pipe, buffer, transfer_len, setup, "RET(ctlr)", usb_pipein(pipe));
+	pkt_print(urb, dev, pipe, buffer, transfer_len, setup, "RET(ctlr)", usb_pipein(pipe));
 #else
 	wait_ms(1);
 #endif
 
 	/* free TDs in urb_priv */
-	urb_free_priv (&urb_priv);
+	if (usb_pipetype (pipe) != PIPE_INTERRUPT)
+		urb_free_priv (urb);
 	return 0;
 }
 
@@ -1399,8 +1576,7 @@ int submit_control_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
 
 	info("submit_control_msg");
 #ifdef DEBUG
-	urb_priv.actual_length = 0;
-	pkt_print(dev, pipe, buffer, transfer_len, setup, "SUB", usb_pipein(pipe));
+	pkt_print(NULL, dev, pipe, buffer, transfer_len, setup, "SUB", usb_pipein(pipe));
 #else
 	wait_ms(1);
 #endif
@@ -1423,7 +1599,8 @@ int submit_int_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
 		int transfer_len, int interval)
 {
 	info("submit_int_msg");
-	return -1;
+	return submit_common_msg(dev, pipe, buffer, transfer_len, NULL,
+			interval);
 }
 
 /*-------------------------------------------------------------------------*
@@ -1537,6 +1714,12 @@ static int hc_start (ohci_t * ohci)
 
 /*-------------------------------------------------------------------------*/
 
+/* Poll USB interrupt. */
+void usb_event_poll(void)
+{
+	hc_interrupt();
+}
+
 /* an interrupt happens */
 
 static int hc_interrupt (void)
@@ -1587,8 +1770,10 @@ static int hc_interrupt (void)
 	if (ints & OHCI_INTR_WDH) {
 		wait_ms(1);
 		writel (OHCI_INTR_WDH, &regs->intrdisable);
+		(void)readl (&regs->intrdisable); /* flush */
 		stat = dl_done_list (&gohci, dl_reverse_done_list (&gohci));
 		writel (OHCI_INTR_WDH, &regs->intrenable);
+		(void)readl (&regs->intrdisable); /* flush */
 	}
 
 	if (ints & OHCI_INTR_SO) {
@@ -1634,6 +1819,9 @@ static char ohci_inited = 0;
 
 int usb_lowlevel_init(void)
 {
+#ifdef CONFIG_PCI_OHCI
+	pci_dev_t pdev;
+#endif
 
 #ifdef CFG_USB_OHCI_CPU_INIT
 	/* cpu dependant init */
@@ -1647,7 +1835,6 @@ int usb_lowlevel_init(void)
 		return -1;
 #endif
 	memset (&gohci, 0, sizeof (ohci_t));
-	memset (&urb_priv, 0, sizeof (urb_priv_t));
 
 	/* align the storage */
 	if ((__u32)&ghcca[0] & 0xff) {
@@ -1673,7 +1860,25 @@ int usb_lowlevel_init(void)
 	gohci.disabled = 1;
 	gohci.sleeping = 0;
 	gohci.irq = -1;
+#ifdef CONFIG_PCI_OHCI
+	pdev = pci_find_devices(ohci_pci_ids, 0);
+
+	if (pdev != -1) {
+		u16 vid, did;
+		u32 base;
+		pci_read_config_word(pdev, PCI_VENDOR_ID, &vid);
+		pci_read_config_word(pdev, PCI_DEVICE_ID, &did);
+		printf("OHCI pci controller (%04x, %04x) found @(%d:%d:%d)\n",
+				vid, did, (pdev >> 16) & 0xff,
+				(pdev >> 11) & 0x1f, (pdev >> 8) & 0x7);
+		pci_read_config_dword(pdev, PCI_BASE_ADDRESS_0, &base);
+		printf("OHCI regs address 0x%08x\n", base);
+		gohci.regs = (struct ohci_regs *)base;
+	} else
+		return -1;
+#else
 	gohci.regs = (struct ohci_regs *)CFG_USB_OHCI_REGS_BASE;
+#endif
 
 	gohci.flags = 0;
 	gohci.slot_name = CFG_USB_OHCI_SLOT_NAME;
@@ -1716,7 +1921,6 @@ int usb_lowlevel_init(void)
 	ohci_dump (&gohci, 1);
 #else
 	wait_ms(1);
-	urb_finished = 1;
 #endif
 	ohci_inited = 1;
 	return 0;
diff --git a/drivers/usb_ohci.h b/drivers/usb_ohci.h
index d2b03c0..380cb4c 100644
--- a/drivers/usb_ohci.h
+++ b/drivers/usb_ohci.h
@@ -64,7 +64,8 @@ struct ed {
 	struct ed *ed_rm_list;
 
 	struct usb_device *usb_dev;
-	__u32 unused[3];
+	void *purb;
+	__u32 unused[2];
 } __attribute((aligned(16)));
 typedef struct ed ed_t;
 
@@ -349,9 +350,14 @@ typedef struct
 	ed_t *ed;
 	__u16 length;	/* number of tds associated with this request */
 	__u16 td_cnt;	/* number of tds already serviced */
+	struct usb_device *dev;
 	int   state;
 	unsigned long pipe;
+	void *transfer_buffer;
+	int transfer_buffer_length;
+	int interval;
 	int actual_length;
+	int finished;
 	td_t *td[N_URB_TD];	/* list pointer to all corresponding TDs associated with this request */
 } urb_priv_t;
 #define URB_DEL 1
@@ -375,6 +381,7 @@ typedef struct ohci {
 
 	struct ohci_regs *regs; /* OHCI controller's memory */
 
+	int ohci_int_load[32];	 /* load of the 32 Interrupt Chains (for load balancing)*/
 	ed_t *ed_rm_list[2];	 /* lists of all endpoints to be removed */
 	ed_t *ed_bulktail;	 /* last endpoint of bulk list */
 	ed_t *ed_controltail;	 /* last endpoint of control list */
@@ -397,7 +404,8 @@ struct ohci_device {
 /* endpoint */
 static int ep_link(ohci_t * ohci, ed_t * ed);
 static int ep_unlink(ohci_t * ohci, ed_t * ed);
-static ed_t * ep_add_ed(struct usb_device * usb_dev, unsigned long pipe);
+static ed_t * ep_add_ed(struct usb_device * usb_dev, unsigned long pipe,
+		int interval, int load);
 
 /*-------------------------------------------------------------------------*/