usbdebug: Move under drivers/usb

Also relocate and split header files, there is some interest
for EHCI debug support without PCI.

Change-Id: Ibe91730eb72dfe0634fb38bdd184043495e2fb08
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5129
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>

4 files changed, 1349 insertions, 0 deletions

diff --git a/src/drivers/usb/Makefile.inc b/src/drivers/usb/Makefile.inc
new file mode 100644
index 0000000000..43931a9c09
--- /dev/null
+++ b/src/drivers/usb/Makefile.inc
@@ -0,0 +1,3 @@
+romstage-$(CONFIG_USBDEBUG_IN_ROMSTAGE) += ehci_debug.c
+
+ramstage-$(CONFIG_USBDEBUG) += ehci_debug.c
diff --git a/src/drivers/usb/ehci.h b/src/drivers/usb/ehci.h
new file mode 100644
index 0000000000..f9203522a5
--- /dev/null
+++ b/src/drivers/usb/ehci.h
@@ -0,0 +1,200 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * It was taken from the Linux kernel (include/linux/usb/ehci_def.h).
+ *
+ * Copyright (C) 2001-2002 David Brownell
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef EHCI_H
+#define EHCI_H
+
+/* EHCI register interface, corresponds to EHCI Revision 0.95 specification */
+
+/* Section 2.2 Host Controller Capability Registers */
+struct ehci_caps {
+	/* these fields are specified as 8 and 16 bit registers,
+	 * but some hosts can't perform 8 or 16 bit PCI accesses.
+	 */
+	u32		hc_capbase;
+#define HC_LENGTH(p)		(((p)>>00)&0x00ff)	/* bits 7:0 */
+#define HC_VERSION(p)		(((p)>>16)&0xffff)	/* bits 31:16 */
+	u32		hcs_params;     /* HCSPARAMS - offset 0x4 */
+#define HCS_DEBUG_PORT(p)	(((p)>>20)&0xf)	/* bits 23:20, debug port? */
+#define HCS_INDICATOR(p)	((p)&(1 << 16))	/* true: has port indicators */
+#define HCS_N_CC(p)		(((p)>>12)&0xf)	/* bits 15:12, #companion HCs */
+#define HCS_N_PCC(p)		(((p)>>8)&0xf)	/* bits 11:8, ports per CC */
+#define HCS_PORTROUTED(p)	((p)&(1 << 7))	/* true: port routing */
+#define HCS_PPC(p)		((p)&(1 << 4))	/* true: port power control */
+#define HCS_N_PORTS(p)		(((p)>>0)&0xf)	/* bits 3:0, ports on HC */
+
+	u32		hcc_params;      /* HCCPARAMS - offset 0x8 */
+/* EHCI 1.1 addendum */
+#define HCC_32FRAME_PERIODIC_LIST(p)	((p)&(1 << 19))
+#define HCC_PER_PORT_CHANGE_EVENT(p)	((p)&(1 << 18))
+#define HCC_LPM(p)			((p)&(1 << 17))
+#define HCC_HW_PREFETCH(p)		((p)&(1 << 16))
+
+#define HCC_EXT_CAPS(p)		(((p)>>8)&0xff)	/* for pci extended caps */
+#define HCC_ISOC_CACHE(p)       ((p)&(1 << 7))  /* true: can cache isoc frame */
+#define HCC_ISOC_THRES(p)       (((p)>>4)&0x7)  /* bits 6:4, uframes cached */
+#define HCC_CANPARK(p)		((p)&(1 << 2))  /* true: can park on async qh */
+#define HCC_PGM_FRAMELISTLEN(p) ((p)&(1 << 1))  /* true: periodic_size changes*/
+#define HCC_64BIT_ADDR(p)       ((p)&(1))       /* true: can use 64-bit addr */
+	u8		portroute[8];	 /* nibbles for routing - offset 0xC */
+} __attribute__ ((packed));
+
+
+/* Section 2.3 Host Controller Operational Registers */
+struct ehci_regs {
+
+	/* USBCMD: offset 0x00 */
+	u32		command;
+
+/* EHCI 1.1 addendum */
+#define CMD_HIRD	(0xf<<24)	/* host initiated resume duration */
+#define CMD_PPCEE	(1<<15)		/* per port change event enable */
+#define CMD_FSP		(1<<14)		/* fully synchronized prefetch */
+#define CMD_ASPE	(1<<13)		/* async schedule prefetch enable */
+#define CMD_PSPE	(1<<12)		/* periodic schedule prefetch enable */
+/* 23:16 is r/w intr rate, in microframes; default "8" == 1/msec */
+#define CMD_PARK	(1<<11)		/* enable "park" on async qh */
+#define CMD_PARK_CNT(c)	(((c)>>8)&3)	/* how many transfers to park for */
+#define CMD_LRESET	(1<<7)		/* partial reset (no ports, etc) */
+#define CMD_IAAD	(1<<6)		/* "doorbell" interrupt async advance */
+#define CMD_ASE		(1<<5)		/* async schedule enable */
+#define CMD_PSE		(1<<4)		/* periodic schedule enable */
+/* 3:2 is periodic frame list size */
+#define CMD_RESET	(1<<1)		/* reset HC not bus */
+#define CMD_RUN		(1<<0)		/* start/stop HC */
+
+	/* USBSTS: offset 0x04 */
+	u32		status;
+#define STS_PPCE_MASK	(0xff<<16)	/* Per-Port change event 1-16 */
+#define STS_ASS		(1<<15)		/* Async Schedule Status */
+#define STS_PSS		(1<<14)		/* Periodic Schedule Status */
+#define STS_RECL	(1<<13)		/* Reclamation */
+#define STS_HALT	(1<<12)		/* Not running (any reason) */
+/* some bits reserved */
+	/* these STS_* flags are also intr_enable bits (USBINTR) */
+#define STS_IAA		(1<<5)		/* Interrupted on async advance */
+#define STS_FATAL	(1<<4)		/* such as some PCI access errors */
+#define STS_FLR		(1<<3)		/* frame list rolled over */
+#define STS_PCD		(1<<2)		/* port change detect */
+#define STS_ERR		(1<<1)		/* "error" completion (overflow, ...) */
+#define STS_INT		(1<<0)		/* "normal" completion (short, ...) */
+
+	/* USBINTR: offset 0x08 */
+	u32		intr_enable;
+
+	/* FRINDEX: offset 0x0C */
+	u32		frame_index;	/* current microframe number */
+	/* CTRLDSSEGMENT: offset 0x10 */
+	u32		segment;	/* address bits 63:32 if needed */
+	/* PERIODICLISTBASE: offset 0x14 */
+	u32		frame_list;	/* points to periodic list */
+	/* ASYNCLISTADDR: offset 0x18 */
+	u32		async_next;	/* address of next async queue head */
+
+	u32		reserved[9];
+
+	/* CONFIGFLAG: offset 0x40 */
+	u32		configured_flag;
+#define FLAG_CF		(1<<0)		/* true: we'll support "high speed" */
+
+	/* PORTSC: offset 0x44 */
+	u32		port_status[0];	/* up to N_PORTS */
+/* EHCI 1.1 addendum */
+#define PORTSC_SUSPEND_STS_ACK 0
+#define PORTSC_SUSPEND_STS_NYET 1
+#define PORTSC_SUSPEND_STS_STALL 2
+#define PORTSC_SUSPEND_STS_ERR 3
+
+#define PORT_DEV_ADDR	(0x7f<<25)		/* device address */
+#define PORT_SSTS	(0x3<<23)		/* suspend status */
+/* 31:23 reserved */
+#define PORT_WKOC_E	(1<<22)		/* wake on overcurrent (enable) */
+#define PORT_WKDISC_E	(1<<21)		/* wake on disconnect (enable) */
+#define PORT_WKCONN_E	(1<<20)		/* wake on connect (enable) */
+/* 19:16 for port testing */
+#define PORT_TEST_PKT	(0x4<<16)	/* Port Test Control - packet test */
+#define PORT_LED_OFF	(0<<14)
+#define PORT_LED_AMBER	(1<<14)
+#define PORT_LED_GREEN	(2<<14)
+#define PORT_LED_MASK	(3<<14)
+#define PORT_OWNER	(1<<13)		/* true: companion hc owns this port */
+#define PORT_POWER	(1<<12)		/* true: has power (see PPC) */
+#define PORT_USB11(x) (((x)&(3<<10)) == (1<<10))	/* USB 1.1 device */
+/* 11:10 for detecting lowspeed devices (reset vs release ownership) */
+/* 9 reserved */
+#define PORT_LPM	(1<<9)		/* LPM transaction */
+#define PORT_RESET	(1<<8)		/* reset port */
+#define PORT_SUSPEND	(1<<7)		/* suspend port */
+#define PORT_RESUME	(1<<6)		/* resume it */
+#define PORT_OCC	(1<<5)		/* over current change */
+#define PORT_OC		(1<<4)		/* over current active */
+#define PORT_PEC	(1<<3)		/* port enable change */
+#define PORT_PE		(1<<2)		/* port enable */
+#define PORT_CSC	(1<<1)		/* connect status change */
+#define PORT_CONNECT	(1<<0)		/* device connected */
+#define PORT_RWC_BITS   (PORT_CSC | PORT_PEC | PORT_OCC)
+} __attribute__ ((packed));
+
+#define USBMODE		0x68		/* USB Device mode */
+#define USBMODE_SDIS	(1<<3)		/* Stream disable */
+#define USBMODE_BE	(1<<2)		/* BE/LE endianness select */
+#define USBMODE_CM_HC	(3<<0)		/* host controller mode */
+#define USBMODE_CM_IDLE	(0<<0)		/* idle state */
+
+/* Moorestown has some non-standard registers, partially due to the fact that
+ * its EHCI controller has both TT and LPM support. HOSTPCx are extensions to
+ * PORTSCx
+ */
+#define HOSTPC0		0x84		/* HOSTPC extension */
+#define HOSTPC_PHCD	(1<<22)		/* Phy clock disable */
+#define HOSTPC_PSPD	(3<<25)		/* Port speed detection */
+#define USBMODE_EX	0xc8		/* USB Device mode extension */
+#define USBMODE_EX_VBPS	(1<<5)		/* VBus Power Select On */
+#define USBMODE_EX_HC	(3<<0)		/* host controller mode */
+#define TXFILLTUNING	0x24		/* TX FIFO Tuning register */
+#define TXFIFO_DEFAULT	(8<<16)		/* FIFO burst threshold 8 */
+
+/* Appendix C, Debug port ... intended for use with special "debug devices"
+ * that can help if there's no serial console.  (nonstandard enumeration.)
+ */
+struct ehci_dbg_port {
+	u32	control;
+#define DBGP_OWNER	(1<<30)
+#define DBGP_ENABLED	(1<<28)
+#define DBGP_DONE	(1<<16)
+#define DBGP_INUSE	(1<<10)
+#define DBGP_ERRCODE(x)	(((x)>>7)&0x07)
+#	define DBGP_ERR_BAD	1
+#	define DBGP_ERR_SIGNAL	2
+#define DBGP_ERROR	(1<<6)
+#define DBGP_GO		(1<<5)
+#define DBGP_OUT	(1<<4)
+#define DBGP_LEN(x)	(((x)>>0)&0x0f)
+	u32	pids;
+#define DBGP_PID_GET(x)		(((x)>>16)&0xff)
+#define DBGP_PID_SET(data, tok)	(((data)<<8)|(tok))
+	u32	data03;
+	u32	data47;
+	u32	address;
+#define DBGP_EPADDR(dev, ep)	(((dev)<<8)|(ep))
+} __attribute__ ((packed));
+#endif
diff --git a/src/drivers/usb/ehci_debug.c b/src/drivers/usb/ehci_debug.c
new file mode 100644
index 0000000000..94625c0e1a
--- /dev/null
+++ b/src/drivers/usb/ehci_debug.c
@@ -0,0 +1,1044 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2006 Eric Biederman (ebiederm@xmission.com)
+ * Copyright (C) 2007 AMD
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
+ */
+
+#include <stddef.h>
+#include <console/console.h>
+#include <console/usb.h>
+#include <device/pci_ehci.h>
+#include <arch/io.h>
+#include <device/pci.h>
+#include <device/pci_def.h>
+#include <arch/byteorder.h>
+#include <arch/early_variables.h>
+#include <string.h>
+#include <cbmem.h>
+
+#include "usb_ch9.h"
+#include "ehci.h"
+
+
+#define DBGP_EP_VALID		(1<<0)
+#define DBGP_EP_ENABLED		(1<<1)
+#define DBGP_EP_BUSY		(1<<2)
+#define DBGP_EP_STATMASK	(DBGP_EP_VALID | DBGP_EP_ENABLED)
+
+struct dbgp_pipe
+{
+	u8 devnum;
+	u8 endpoint;
+	u8 pid;
+	u8 status;
+	int timeout;
+
+	u8 bufidx;
+	char buf[8];
+};
+
+#define DBGP_MAX_ENDPOINTS	4
+#define DBGP_SETUP_EP0		0	/* Compulsory endpoint 0. */
+#define DBGP_CONSOLE_EPOUT	1
+#define DBGP_CONSOLE_EPIN	2
+
+struct ehci_debug_info {
+	void *ehci_caps;
+	void *ehci_regs;
+	void *ehci_debug;
+
+	struct dbgp_pipe ep_pipe[DBGP_MAX_ENDPOINTS];
+};
+
+#if CONFIG_DEBUG_USBDEBUG
+static void dbgp_print_data(struct ehci_dbg_port *ehci_debug);
+static int dbgp_enabled(void);
+# define dprintk(LEVEL, args...) \
+	do { if (!dbgp_enabled()) printk(LEVEL, ##args); } while (0)
+#else
+# define dbgp_print_data(x)	do {} while(0)
+# define dprintk(LEVEL, args...)   do {} while(0)
+#endif
+
+#define USB_DEBUG_DEVNUM 127
+
+#define DBGP_LEN_UPDATE(x, len) (((x) & ~0x0f) | ((len) & 0x0f))
+/*
+ * USB Packet IDs (PIDs)
+ */
+
+/* token */
+#define USB_PID_OUT		0xe1
+#define USB_PID_IN		0x69
+#define USB_PID_SOF		0xa5
+#define USB_PID_SETUP		0x2d
+/* handshake */
+#define USB_PID_ACK		0xd2
+#define USB_PID_NAK		0x5a
+#define USB_PID_STALL		0x1e
+#define USB_PID_NYET		0x96
+/* data */
+#define USB_PID_DATA0		0xc3
+#define USB_PID_DATA1		0x4b
+#define USB_PID_DATA2		0x87
+#define USB_PID_MDATA		0x0f
+/* Special */
+#define USB_PID_PREAMBLE	0x3c
+#define USB_PID_ERR		0x3c
+#define USB_PID_SPLIT		0x78
+#define USB_PID_PING		0xb4
+#define USB_PID_UNDEF_0		0xf0
+
+#define USB_PID_DATA_TOGGLE	0x88
+#define DBGP_CLAIM (DBGP_OWNER | DBGP_ENABLED | DBGP_INUSE)
+
+#define PCI_CAP_ID_EHCI_DEBUG	0xa
+
+#define HUB_ROOT_RESET_TIME	50	/* times are in msec */
+#define HUB_SHORT_RESET_TIME	10
+#define HUB_LONG_RESET_TIME	200
+#define HUB_RESET_TIMEOUT	500
+
+#define DBGP_MICROFRAME_TIMEOUT_LOOPS	1000
+#define DBGP_MICROFRAME_RETRIES		10
+#define DBGP_MAX_PACKET		8
+
+static struct ehci_debug_info glob_dbg_info CAR_GLOBAL;
+#if !defined(__PRE_RAM__) && !defined(__SMM__)
+static struct device_operations *ehci_drv_ops;
+static struct device_operations ehci_dbg_ops;
+#endif
+
+static inline struct ehci_debug_info *dbgp_ehci_info(void)
+{
+	return car_get_var_ptr(&glob_dbg_info);
+}
+
+static int dbgp_wait_until_complete(struct ehci_dbg_port *ehci_debug)
+{
+	u32 ctrl;
+	int loop = 0;
+
+	do {
+		ctrl = read32((unsigned long)&ehci_debug->control);
+		/* Stop when the transaction is finished */
+		if (ctrl & DBGP_DONE)
+			break;
+	} while (++loop < DBGP_MICROFRAME_TIMEOUT_LOOPS);
+
+	if (! (ctrl & DBGP_DONE)) {
+		dprintk(BIOS_ERR, "dbgp_wait_until_complete: retry timeout.\n");
+		return -DBGP_ERR_SIGNAL;
+	}
+
+	/* Now that we have observed the completed transaction,
+	 * clear the done bit.
+	 */
+	write32((unsigned long)&ehci_debug->control, ctrl | DBGP_DONE);
+	return (ctrl & DBGP_ERROR) ? -DBGP_ERRCODE(ctrl) : DBGP_LEN(ctrl);
+}
+
+static void dbgp_breath(void)
+{
+	/* Sleep to give the debug port a chance to breathe */
+}
+
+static int dbgp_wait_until_done(struct ehci_dbg_port *ehci_debug, struct dbgp_pipe *pipe,
+	unsigned ctrl, const int timeout)
+{
+	u32 rd_ctrl, rd_pids;
+	u32 ctrl_prev = 0, pids_prev = 0;
+	u8 lpid;
+	int ret, host_retries;
+	int loop;
+
+	loop = 0;
+device_retry:
+	host_retries = 0;
+	if (loop++ >= timeout)
+		return -DBGP_ERR_BAD;
+
+host_retry:
+	if (host_retries++ >= DBGP_MICROFRAME_RETRIES)
+		return -DBGP_ERR_BAD;
+	if (loop == 1 || host_retries > 1)
+		dprintk(BIOS_SPEW, "dbgp:  start (@ %3d,%d) ctrl=%08x\n",
+			loop, host_retries, ctrl | DBGP_GO);
+	write32((unsigned long)&ehci_debug->control, ctrl | DBGP_GO);
+	ret = dbgp_wait_until_complete(ehci_debug);
+	rd_ctrl = read32((unsigned long)&ehci_debug->control);
+	rd_pids = read32((unsigned long)&ehci_debug->pids);
+
+	if (rd_ctrl != ctrl_prev || rd_pids != pids_prev || (ret<0)) {
+		ctrl_prev = rd_ctrl;
+		pids_prev = rd_pids;
+		dprintk(BIOS_SPEW, "dbgp: status (@ %3d,%d) ctrl=%08x pids=%08x ret=%d\n",
+			loop, host_retries, rd_ctrl, rd_pids, ret);
+	}
+
+	/* Controller hardware failure. */
+	if (ret == -DBGP_ERR_SIGNAL) {
+		return ret;
+
+	/* Bus failure (corrupted microframe). */
+	} else if (ret == -DBGP_ERR_BAD) {
+		goto host_retry;
+	}
+
+	lpid = DBGP_PID_GET(rd_pids);
+
+	/* If I get an ACK or in-sync DATA PID, we are done. */
+	if ((lpid == USB_PID_ACK) || (lpid == pipe->pid)) {
+		if (DBGP_LEN(rd_ctrl))
+			pipe->pid ^= USB_PID_DATA_TOGGLE;
+	}
+
+	/* If the port is getting full or it has dropped data
+	 * start pacing ourselves, not necessary but it's friendly.
+	 */
+	else if (lpid == USB_PID_NYET) {
+		dbgp_breath();
+		goto device_retry;
+	}
+
+	/* If I get a NACK or out-of-sync DATA PID, reissue the transmission. */
+	else if ((lpid == USB_PID_NAK) || (lpid == (pipe->pid ^ USB_PID_DATA_TOGGLE))) {
+		goto device_retry;
+	}
+
+	/* Abort on STALL handshake for endpoint 0.*/
+	else if ((lpid == USB_PID_STALL) && (pipe->endpoint == 0x0)) {
+		ret = -DBGP_ERR_BAD;
+	}
+
+	dbgp_print_data(ehci_debug);
+
+	return ret;
+}
+
+static void dbgp_set_data(struct ehci_dbg_port *ehci_debug, const void *buf, int size)
+{
+	const unsigned char *bytes = buf;
+	u32 lo, hi;
+	int i;
+
+	lo = hi = 0;
+	for (i = 0; i < 4 && i < size; i++)
+		lo |= bytes[i] << (8*i);
+	for (; i < 8 && i < size; i++)
+		hi |= bytes[i] << (8*(i - 4));
+	write32((unsigned long)&ehci_debug->data03, lo);
+	write32((unsigned long)&ehci_debug->data47, hi);
+}
+
+static void dbgp_get_data(struct ehci_dbg_port *ehci_debug, void *buf, int size)
+{
+	unsigned char *bytes = buf;
+	u32 lo, hi;
+	int i;
+
+	lo = read32((unsigned long)&ehci_debug->data03);
+	hi = read32((unsigned long)&ehci_debug->data47);
+	for (i = 0; i < 4 && i < size; i++)
+		bytes[i] = (lo >> (8*i)) & 0xff;
+	for (; i < 8 && i < size; i++)
+		bytes[i] = (hi >> (8*(i - 4))) & 0xff;
+}
+
+#if CONFIG_DEBUG_USBDEBUG
+static void dbgp_print_data(struct ehci_dbg_port *ehci_debug)
+{
+	u32 ctrl = read32((unsigned long)&ehci_debug->control);
+	u32	lo = read32((unsigned long)&ehci_debug->data03);
+	u32	hi = read32((unsigned long)&ehci_debug->data47);
+	int len = DBGP_LEN(ctrl);
+	if (len) {
+		int i;
+		dprintk(BIOS_SPEW, "dbgp:    buf:");
+		for (i = 0; i < 4 && i < len; i++)
+			dprintk(BIOS_SPEW, " %02x", (lo >> (8*i)) & 0xff);
+		for (; i < 8 && i < len; i++)
+			dprintk(BIOS_SPEW, " %02x", (hi >> (8*(i - 4))) & 0xff);
+		dprintk(BIOS_SPEW, "\n");
+	}
+}
+#endif
+
+static int dbgp_bulk_write(struct ehci_dbg_port *ehci_debug, struct dbgp_pipe *pipe,
+	const char *bytes, int size)
+{
+	u32 pids, addr, ctrl;
+	int ret;
+
+	if (size > DBGP_MAX_PACKET)
+		return -1;
+
+	addr = DBGP_EPADDR(pipe->devnum, pipe->endpoint);
+	pids = DBGP_PID_SET(pipe->pid, USB_PID_OUT);
+
+	ctrl = read32((unsigned long)&ehci_debug->control);
+	ctrl = DBGP_LEN_UPDATE(ctrl, size);
+	ctrl |= DBGP_OUT;
+
+	dbgp_set_data(ehci_debug, bytes, size);
+	write32((unsigned long)&ehci_debug->address, addr);
+	write32((unsigned long)&ehci_debug->pids, pids);
+
+	ret = dbgp_wait_until_done(ehci_debug, pipe, ctrl, pipe->timeout);
+
+	return ret;
+}
+
+int dbgp_bulk_write_x(struct dbgp_pipe *pipe, const char *bytes, int size)
+{
+	struct ehci_debug_info *dbg_info = dbgp_ehci_info();
+	return dbgp_bulk_write(dbg_info->ehci_debug, pipe, bytes, size);
+}
+
+static int dbgp_bulk_read(struct ehci_dbg_port *ehci_debug, struct dbgp_pipe *pipe,
+	void *data, int size)
+{
+	u32 pids, addr, ctrl;
+	int ret;
+
+	if (size > DBGP_MAX_PACKET)
+		return -1;
+
+	addr = DBGP_EPADDR(pipe->devnum, pipe->endpoint);
+	pids = DBGP_PID_SET(pipe->pid, USB_PID_IN);
+
+	ctrl = read32((unsigned long)&ehci_debug->control);
+	ctrl = DBGP_LEN_UPDATE(ctrl, size);
+	ctrl &= ~DBGP_OUT;
+
+	write32((unsigned long)&ehci_debug->address, addr);
+	write32((unsigned long)&ehci_debug->pids, pids);
+	ret = dbgp_wait_until_done(ehci_debug, pipe, ctrl, pipe->timeout);
+	if (ret < 0)
+		return ret;
+
+	if (size > ret)
+		size = ret;
+	dbgp_get_data(ehci_debug, data, size);
+	return ret;
+}
+
+int dbgp_bulk_read_x(struct dbgp_pipe *pipe, void *data, int size)
+{
+	struct ehci_debug_info *dbg_info = dbgp_ehci_info();
+	return dbgp_bulk_read(dbg_info->ehci_debug, pipe, data, size);
+}
+
+static void dbgp_mdelay(int ms)
+{
+	int i;
+
+	while (ms--) {
+		for (i = 0; i < 1000; i++)
+			inb(0x80);
+	}
+}
+
+static int dbgp_control_msg(struct ehci_dbg_port *ehci_debug, unsigned devnum, int requesttype,
+		int request, int value, int index, void *data, int size)
+{
+	struct ehci_debug_info *info = dbgp_ehci_info();
+	struct dbgp_pipe *pipe = &info->ep_pipe[DBGP_SETUP_EP0];
+	u32 pids, addr, ctrl;
+	struct usb_ctrlrequest req;
+	int read;
+	int ret, ret2;
+
+	read = (requesttype & USB_DIR_IN) != 0;
+	if (size > DBGP_MAX_PACKET)
+		return -1;
+
+	/* Compute the control message */
+	req.bRequestType = requesttype;
+	req.bRequest = request;
+	req.wValue = cpu_to_le16(value);
+	req.wIndex = cpu_to_le16(index);
+	req.wLength = cpu_to_le16(size);
+
+	pipe->devnum = devnum;
+	pipe->endpoint = 0;
+	pipe->pid = USB_PID_DATA0;
+	pipe->timeout = 1000;
+	addr = DBGP_EPADDR(pipe->devnum, pipe->endpoint);
+	pids = DBGP_PID_SET(pipe->pid, USB_PID_SETUP);
+
+	ctrl = read32((unsigned long)&ehci_debug->control);
+	ctrl = DBGP_LEN_UPDATE(ctrl, sizeof(req));
+	ctrl |= DBGP_OUT;
+
+	/* Setup stage */
+	dbgp_set_data(ehci_debug, &req, sizeof(req));
+	write32((unsigned long)&ehci_debug->address, addr);
+	write32((unsigned long)&ehci_debug->pids, pids);
+	ret = dbgp_wait_until_done(ehci_debug, pipe, ctrl, 1);
+	if (ret < 0)
+		return ret;
+
+	/* Data stage (optional) */
+	if (read && size)
+		ret = dbgp_bulk_read(ehci_debug, pipe, data, size);
+	else if (!read && size)
+		ret = dbgp_bulk_write(ehci_debug, pipe, data, size);
+
+	/* Status stage in opposite direction */
+	pipe->pid = USB_PID_DATA1;
+	ctrl = read32((unsigned long)&ehci_debug->control);
+	ctrl = DBGP_LEN_UPDATE(ctrl, 0);
+	if (read) {
+		pids = DBGP_PID_SET(pipe->pid, USB_PID_OUT);
+		ctrl |= DBGP_OUT;
+	} else {
+		pids = DBGP_PID_SET(pipe->pid, USB_PID_IN);
+		ctrl &= ~DBGP_OUT;
+	}
+
+	write32((unsigned long)&ehci_debug->pids, pids);
+	ret2 = dbgp_wait_until_done(ehci_debug, pipe, ctrl, pipe->timeout);
+	if (ret2 < 0)
+		return ret2;
+
+	return ret;
+}
+
+static int ehci_reset_port(struct ehci_regs *ehci_regs, int port)
+{
+	u32 portsc;
+	u32 delay_time, delay_ms;
+	int loop;
+
+	/* Reset the usb debug port */
+	portsc = read32((unsigned long)&ehci_regs->port_status[port - 1]);
+	portsc &= ~PORT_PE;
+	portsc |= PORT_RESET;
+	write32((unsigned long)&ehci_regs->port_status[port - 1], portsc);
+
+	delay_ms = HUB_ROOT_RESET_TIME;
+	for (delay_time = 0; delay_time < HUB_RESET_TIMEOUT;
+	     delay_time += delay_ms) {
+		dbgp_mdelay(delay_ms);
+
+		portsc = read32((unsigned long)&ehci_regs->port_status[port - 1]);
+		if (portsc & PORT_RESET) {
+			/* force reset to complete */
+			loop = 2;
+			write32((unsigned long)&ehci_regs->port_status[port - 1],
+					portsc & ~(PORT_RWC_BITS | PORT_RESET));
+			do {
+				dbgp_mdelay(delay_ms);
+				portsc = read32((unsigned long)&ehci_regs->port_status[port - 1]);
+				delay_time += delay_ms;
+			} while ((portsc & PORT_RESET) && (--loop > 0));
+			if (!loop) {
+				printk(BIOS_DEBUG, "ehci_reset_port forced done");
+			}
+		}
+
+		/* Device went away? */
+		if (!(portsc & PORT_CONNECT))
+			return -1; //-ENOTCONN;
+
+		/* bomb out completely if something weird happened */
+		if ((portsc & PORT_CSC))
+			return -2; //-EINVAL;
+
+		/* If we've finished resetting, then break out of the loop */
+		if (!(portsc & PORT_RESET) && (portsc & PORT_PE))
+			return 0;
+	}
+	return -3; //-EBUSY;
+}
+
+static int ehci_wait_for_port(struct ehci_regs *ehci_regs, int port)
+{
+	u32 status;
+	int ret, reps;
+
+	for (reps = 0; reps < 3; reps++) {
+		dbgp_mdelay(100);
+		status = read32((unsigned long)&ehci_regs->status);
+		if (status & STS_PCD) {
+			ret = ehci_reset_port(ehci_regs, port);
+			if (ret == 0)
+				return 0;
+		}
+	}
+	return -1; //-ENOTCONN;
+}
+
+#define USB_HUB_PORT_CONNECTION		0
+#define USB_HUB_PORT_ENABLED		1
+#define USB_HUB_PORT_RESET			4
+#define USB_HUB_PORT_POWER			8
+#define USB_HUB_C_PORT_CONNECTION	16
+#define USB_HUB_C_PORT_RESET		20
+
+#if CONFIG_USBDEBUG_OPTIONAL_HUB_PORT
+
+static int hub_port_status(const char * buf, int feature)
+{
+	return !!(buf[feature>>3] & (1<<(feature&0x7)));
+}
+
+static int dbgp_hub_enable(struct ehci_dbg_port *ehci_debug, unsigned int port)
+{
+	const u8 hub_addr = USB_DEBUG_DEVNUM-1;
+	char status[8];
+	int ret, loop;
+
+	/* Move hub to address 126. */
+	ret = dbgp_control_msg(ehci_debug, 0,
+		USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
+		USB_REQ_SET_ADDRESS, hub_addr, 0, NULL, 0);
+	if (ret < 0)
+		goto err;
+
+	/* Enter configured state on hub. */
+	ret = dbgp_control_msg(ehci_debug, hub_addr,
+		USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
+		USB_REQ_SET_CONFIGURATION, 1, 0, NULL, 0);
+	if (ret < 0)
+		goto err;
+
+	/* Set PORT_POWER, poll for PORT_CONNECTION. */
+	ret = dbgp_control_msg(ehci_debug, hub_addr,
+		USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_OTHER,
+		USB_REQ_SET_FEATURE, USB_HUB_PORT_POWER, port, NULL, 0);
+	if (ret < 0)
+		goto err;
+
+	loop = 100;
+	do {
+		dbgp_mdelay(10);
+		ret = dbgp_control_msg(ehci_debug, hub_addr,
+			USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_OTHER,
+			USB_REQ_GET_STATUS, 0, port, status, 4);
+		if (ret < 0)
+			goto err;
+		if (hub_port_status(status, USB_HUB_PORT_CONNECTION))
+			break;
+	} while (--loop);
+	if (! loop)
+		goto err;
+
+	ret = dbgp_control_msg(ehci_debug, hub_addr,
+		USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_OTHER,
+		USB_REQ_CLEAR_FEATURE, USB_HUB_C_PORT_CONNECTION, port, NULL, 0);
+	if (ret < 0)
+		goto err;
+
+
+	/* Set PORT_RESET, poll for C_PORT_RESET. */
+	ret = dbgp_control_msg(ehci_debug, hub_addr,
+		USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_OTHER,
+		USB_REQ_SET_FEATURE, USB_HUB_PORT_RESET, port, NULL, 0);
+	if (ret < 0)
+		goto err;
+
+	loop = 100;
+	do {
+		dbgp_mdelay(10);
+		ret = dbgp_control_msg(ehci_debug, hub_addr,
+			USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_OTHER,
+			USB_REQ_GET_STATUS, 0, port, status, 4);
+		if (ret < 0)
+			goto err;
+		if (hub_port_status(status, USB_HUB_C_PORT_RESET))
+			break;
+	} while (--loop);
+	if (! loop)
+		goto err;
+
+	ret = dbgp_control_msg(ehci_debug, hub_addr,
+		USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_OTHER,
+		USB_REQ_CLEAR_FEATURE, USB_HUB_C_PORT_RESET, port, NULL, 0);
+	if (ret < 0)
+		goto err;
+
+	if (hub_port_status(status, USB_HUB_PORT_ENABLED))
+		return 0;
+err:
+	return -1;
+}
+#endif /* CONFIG_USBDEBUG_OPTIONAL_HUB_PORT */
+
+static void enable_usbdebug(void)
+{
+#if defined(__PRE_RAM__) || !CONFIG_USBDEBUG_IN_ROMSTAGE
+	pci_devfn_t dbg_dev = pci_ehci_dbg_dev(CONFIG_USBDEBUG_HCD_INDEX);
+	pci_ehci_dbg_enable(dbg_dev, CONFIG_EHCI_BAR);
+#endif
+}
+
+static void set_debug_port(unsigned int port)
+{
+	pci_devfn_t dbg_dev = pci_ehci_dbg_dev(CONFIG_USBDEBUG_HCD_INDEX);
+	pci_ehci_dbg_set_port(dbg_dev, port);
+}
+
+static int usbdebug_init_(unsigned ehci_bar, unsigned offset, struct ehci_debug_info *info)
+{
+	struct ehci_caps *ehci_caps;
+	struct ehci_regs *ehci_regs;
+	struct ehci_dbg_port *ehci_debug;
+
+	struct usb_debug_descriptor dbgp_desc;
+	u32 cmd, ctrl, status, portsc, hcs_params;
+	u32 debug_port, new_debug_port = 0, n_ports;
+	u32 devnum;
+	int ret, i, configured;
+	int loop;
+	int port_map_tried;
+	int playtimes = 3;
+
+	ehci_caps  = (struct ehci_caps *)ehci_bar;
+	ehci_regs  = (struct ehci_regs *)(ehci_bar +
+			HC_LENGTH(read32((unsigned long)&ehci_caps->hc_capbase)));
+	ehci_debug = (struct ehci_dbg_port *)(ehci_bar + offset);
+	info->ehci_debug = (void *)0;
+	memset(&info->ep_pipe, 0, sizeof (info->ep_pipe));
+
+	if (CONFIG_USBDEBUG_DEFAULT_PORT > 0)
+		set_debug_port(CONFIG_USBDEBUG_DEFAULT_PORT);
+	else
+		set_debug_port(1);
+
+try_next_time:
+	port_map_tried = 0;
+
+try_next_port:
+	hcs_params = read32((unsigned long)&ehci_caps->hcs_params);
+	debug_port = HCS_DEBUG_PORT(hcs_params);
+	n_ports    = HCS_N_PORTS(hcs_params);
+
+	dprintk(BIOS_INFO, "ehci_bar: 0x%x\n", ehci_bar);
+	dprintk(BIOS_INFO, "debug_port: %d\n", debug_port);
+	dprintk(BIOS_INFO, "n_ports:    %d\n", n_ports);
+
+        for (i = 1; i <= n_ports; i++) {
+                portsc = read32((unsigned long)&ehci_regs->port_status[i-1]);
+                dprintk(BIOS_INFO, "PORTSC #%d: %08x\n", i, portsc);
+        }
+
+	if(port_map_tried && (new_debug_port != debug_port)) {
+		if(--playtimes) {
+			set_debug_port(debug_port);
+			goto try_next_time;
+		}
+		return -1;
+	}
+
+	/* Wait until the controller is halted */
+	status = read32((unsigned long)&ehci_regs->status);
+	if (!(status & STS_HALT)) {
+		cmd = read32((unsigned long)&ehci_regs->command);
+		cmd &= ~CMD_RUN;
+		write32((unsigned long)&ehci_regs->command, cmd);
+		loop = 100;
+		do {
+			dbgp_mdelay(10);
+			status = read32((unsigned long)&ehci_regs->status);
+		} while (!(status & STS_HALT) && (--loop > 0));
+		if (status & STS_HALT)
+			dprintk(BIOS_INFO, "EHCI controller halted successfully.\n");
+		else
+			dprintk(BIOS_INFO, "EHCI controller is not halted. Reset may fail.\n");
+	}
+
+	loop = 100;
+	/* Reset the EHCI controller */
+	cmd = read32((unsigned long)&ehci_regs->command);
+	cmd |= CMD_RESET;
+	write32((unsigned long)&ehci_regs->command, cmd);
+	do {
+		dbgp_mdelay(10);
+		cmd = read32((unsigned long)&ehci_regs->command);
+	} while ((cmd & CMD_RESET) && (--loop > 0));
+
+	if(!loop) {
+		dprintk(BIOS_INFO, "Could not reset EHCI controller.\n");
+		// on some systems it works without succeeding here.
+		// return -2;
+	} else {
+		dprintk(BIOS_INFO, "EHCI controller reset successfully.\n");
+	}
+
+	/* Claim ownership, but do not enable yet */
+	ctrl = read32((unsigned long)&ehci_debug->control);
+	ctrl |= DBGP_OWNER;
+	ctrl &= ~(DBGP_ENABLED | DBGP_INUSE);
+	write32((unsigned long)&ehci_debug->control, ctrl);
+
+	/* Start EHCI controller */
+	cmd = read32((unsigned long)&ehci_regs->command);
+	cmd &= ~(CMD_LRESET | CMD_IAAD | CMD_PSE | CMD_ASE | CMD_RESET);
+	cmd |= CMD_RUN;
+	write32((unsigned long)&ehci_regs->command, cmd);
+
+	/* Ensure everything is routed to the EHCI */
+	write32((unsigned long)&ehci_regs->configured_flag, FLAG_CF);
+
+	/* Wait until the controller is no longer halted */
+	loop = 10;
+	do {
+		dbgp_mdelay(10);
+		status = read32((unsigned long)&ehci_regs->status);
+	} while ((status & STS_HALT) && (--loop > 0));
+
+	if(!loop) {
+		dprintk(BIOS_INFO, "EHCI could not be started.\n");
+		return -3;
+	}
+	dprintk(BIOS_INFO, "EHCI started.\n");
+
+	/* Wait for a device to show up in the debug port */
+	ret = ehci_wait_for_port(ehci_regs, debug_port);
+	if (ret < 0) {
+		dprintk(BIOS_INFO, "No device found in debug port %d\n", debug_port);
+		goto next_debug_port;
+	}
+	dprintk(BIOS_INFO, "EHCI done waiting for port.\n");
+
+	/* Enable the debug port */
+	ctrl = read32((unsigned long)&ehci_debug->control);
+	ctrl |= DBGP_CLAIM;
+	write32((unsigned long)&ehci_debug->control, ctrl);
+	ctrl = read32((unsigned long)&ehci_debug->control);
+	if ((ctrl & DBGP_CLAIM) != DBGP_CLAIM) {
+		dprintk(BIOS_INFO, "No device in EHCI debug port.\n");
+		write32((unsigned long)&ehci_debug->control, ctrl & ~DBGP_CLAIM);
+		ret = -4;
+		goto err;
+	}
+	dprintk(BIOS_INFO, "EHCI debug port enabled.\n");
+
+	/* Completely transfer the debug device to the debug controller */
+	portsc = read32((unsigned long)&ehci_regs->port_status[debug_port - 1]);
+	portsc &= ~PORT_PE;
+	write32((unsigned long)&ehci_regs->port_status[debug_port - 1], portsc);
+
+	dbgp_mdelay(100);
+
+#if CONFIG_USBDEBUG_OPTIONAL_HUB_PORT
+	ret = dbgp_hub_enable(ehci_debug, CONFIG_USBDEBUG_OPTIONAL_HUB_PORT);
+	if (ret < 0) {
+		dprintk(BIOS_INFO, "Could not enable USB hub on debug port.\n");
+		ret = -6;
+		goto err;
+	}
+#endif
+
+	/* Find the debug device and make it device number 127 */
+	devnum = 0;
+debug_dev_retry:
+	memset(&dbgp_desc, 0, sizeof(dbgp_desc));
+	ret = dbgp_control_msg(ehci_debug, devnum,
+		USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
+		USB_REQ_GET_DESCRIPTOR, (USB_DT_DEBUG << 8), 0,
+		&dbgp_desc, sizeof(dbgp_desc));
+	if (ret == sizeof(dbgp_desc)) {
+		if (dbgp_desc.bLength == sizeof(dbgp_desc) && dbgp_desc.bDescriptorType==USB_DT_DEBUG)
+			goto debug_dev_found;
+		else
+			dprintk(BIOS_INFO, "Invalid debug device descriptor.\n");
+	}
+	if (devnum == 0) {
+		devnum = USB_DEBUG_DEVNUM;
+		goto debug_dev_retry;
+	} else {
+		dprintk(BIOS_INFO, "Could not find attached debug device.\n");
+		ret = -5;
+		goto err;
+	}
+debug_dev_found:
+
+	/* Move the device to 127 if it isn't already there */
+	if (devnum != USB_DEBUG_DEVNUM) {
+		ret = dbgp_control_msg(ehci_debug, devnum,
+			USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
+			USB_REQ_SET_ADDRESS, USB_DEBUG_DEVNUM, 0, NULL, 0);
+		if (ret < 0) {
+			dprintk(BIOS_INFO, "Could not move attached device to %d.\n",
+				USB_DEBUG_DEVNUM);
+			ret = -7;
+			goto err;
+		}
+		devnum = USB_DEBUG_DEVNUM;
+		dprintk(BIOS_INFO, "EHCI debug device renamed to 127.\n");
+	}
+
+	/* Enable the debug interface */
+	ret = dbgp_control_msg(ehci_debug, USB_DEBUG_DEVNUM,
+		USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
+		USB_REQ_SET_FEATURE, USB_DEVICE_DEBUG_MODE, 0, NULL, 0);
+	if (ret < 0) {
+		dprintk(BIOS_INFO, "Could not enable EHCI debug device.\n");
+		ret = -8;
+		goto err;
+	}
+	dprintk(BIOS_INFO, "EHCI debug interface enabled.\n");
+
+	/* Prepare endpoint pipes. */
+	for (i=1; i<DBGP_MAX_ENDPOINTS; i++) {
+		info->ep_pipe[i].devnum = USB_DEBUG_DEVNUM;
+		info->ep_pipe[i].pid = USB_PID_DATA0;
+		info->ep_pipe[i].timeout = 1000;
+	}
+	info->ep_pipe[DBGP_CONSOLE_EPOUT].endpoint = dbgp_desc.bDebugOutEndpoint;
+	info->ep_pipe[DBGP_CONSOLE_EPIN].endpoint = dbgp_desc.bDebugInEndpoint;
+
+	/* Perform a small write. */
+	configured = 0;
+small_write:
+	ret = dbgp_bulk_write(ehci_debug, &info->ep_pipe[DBGP_CONSOLE_EPOUT], "USB\r\n",5);
+	if (ret < 0) {
+		dprintk(BIOS_INFO, "dbgp_bulk_write failed: %d\n", ret);
+		if (!configured) {
+			/* Send Set Configure request to device. This is required for FX2
+			   (CY7C68013) to transfer from USB state Addressed to Configured,
+			   only then endpoints other than 0 are enabled. */
+			if (dbgp_control_msg(ehci_debug, USB_DEBUG_DEVNUM,
+				USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
+				USB_REQ_SET_CONFIGURATION, 1, 0, NULL, 0) >= 0) {
+				configured = 1;
+				goto small_write;
+			}
+		}
+		ret = -9;
+		goto err;
+	}
+	dprintk(BIOS_INFO, "Test write done\n");
+
+	info->ehci_caps = ehci_caps;
+	info->ehci_regs = ehci_regs;
+	info->ehci_debug = ehci_debug;
+
+	info->ep_pipe[DBGP_SETUP_EP0].status |= DBGP_EP_ENABLED | DBGP_EP_VALID;
+	info->ep_pipe[DBGP_CONSOLE_EPOUT].status |= DBGP_EP_ENABLED | DBGP_EP_VALID;
+	info->ep_pipe[DBGP_CONSOLE_EPIN].status |= DBGP_EP_ENABLED | DBGP_EP_VALID;
+	return 0;
+err:
+	/* Things didn't work so remove my claim */
+	ctrl = read32((unsigned long)&ehci_debug->control);
+	ctrl &= ~(DBGP_CLAIM | DBGP_OUT);
+	write32((unsigned long)(unsigned long)&ehci_debug->control, ctrl);
+	//return ret;
+
+next_debug_port:
+#if CONFIG_USBDEBUG_DEFAULT_PORT==0
+	port_map_tried |= (1 << (debug_port - 1));
+	new_debug_port = ((debug_port-1 + 1) % n_ports) + 1;
+	if (port_map_tried != ((1 << n_ports) - 1)) {
+		set_debug_port(new_debug_port);
+		goto try_next_port;
+	}
+	if (--playtimes) {
+		set_debug_port(new_debug_port);
+		goto try_next_time;
+	}
+#else
+	if (0)
+		goto try_next_port;
+	if (--playtimes)
+		goto try_next_time;
+#endif
+
+	return -10;
+}
+
+#if CONFIG_DEBUG_USBDEBUG
+static int dbgp_enabled(void)
+{
+	struct dbgp_pipe *globals = &dbgp_ehci_info()->ep_pipe[DBGP_SETUP_EP0];
+	return (globals->status & DBGP_EP_ENABLED);
+}
+#endif
+
+static int dbgp_try_get(struct dbgp_pipe *pipe)
+{
+	struct dbgp_pipe *globals = &dbgp_ehci_info()->ep_pipe[DBGP_SETUP_EP0];
+	if (!dbgp_ep_is_active(pipe) || (globals->status & DBGP_EP_BUSY))
+		return 0;
+	globals->status |= DBGP_EP_BUSY;
+	pipe->status |= DBGP_EP_BUSY;
+	return 1;
+}
+
+static void dbgp_put(struct dbgp_pipe *pipe)
+{
+	struct dbgp_pipe *globals = &dbgp_ehci_info()->ep_pipe[DBGP_SETUP_EP0];
+	globals->status &= ~DBGP_EP_BUSY;
+	pipe->status &= ~DBGP_EP_BUSY;
+}
+
+void usbdebug_tx_byte(struct dbgp_pipe *pipe, unsigned char data)
+{
+	if (!dbgp_try_get(pipe))
+		return;
+	pipe->buf[pipe->bufidx++] = data;
+	if (pipe->bufidx >= 8) {
+		dbgp_bulk_write_x(pipe, pipe->buf, pipe->bufidx);
+		pipe->bufidx = 0;
+	}
+	dbgp_put(pipe);
+}
+
+void usbdebug_tx_flush(struct dbgp_pipe *pipe)
+{
+	if (!dbgp_try_get(pipe))
+		return;
+	if (pipe->bufidx > 0) {
+		dbgp_bulk_write_x(pipe, pipe->buf, pipe->bufidx);
+		pipe->bufidx = 0;
+	}
+	dbgp_put(pipe);
+}
+
+#if !defined(__PRE_RAM__) && !defined(__SMM__)
+static void usbdebug_re_enable(unsigned ehci_base)
+{
+	struct ehci_debug_info *dbg_info = dbgp_ehci_info();
+	unsigned diff;
+	int i;
+
+	if (!dbg_info->ehci_debug)
+		return;
+
+	diff = (unsigned)dbg_info->ehci_caps - ehci_base;
+	dbg_info->ehci_regs -= diff;
+	dbg_info->ehci_debug -= diff;
+	dbg_info->ehci_caps = (void*)ehci_base;
+
+	for (i=0; i<DBGP_MAX_ENDPOINTS; i++)
+		dbg_info->ep_pipe[i].status |= DBGP_EP_ENABLED;
+}
+
+static void usbdebug_disable(void)
+{
+	struct ehci_debug_info *dbg_info = dbgp_ehci_info();
+	int i;
+	for (i=0; i<DBGP_MAX_ENDPOINTS; i++)
+		dbg_info->ep_pipe[i].status &= ~DBGP_EP_ENABLED;
+}
+
+static void pci_ehci_set_resources(struct device *dev)
+{
+	struct resource *res;
+
+	printk(BIOS_DEBUG, "%s EHCI Debug Port hook triggered\n", dev_path(dev));
+	usbdebug_disable();
+
+	if (ehci_drv_ops->set_resources)
+		ehci_drv_ops->set_resources(dev);
+	res = find_resource(dev, EHCI_BAR_INDEX);
+	if (!res)
+		return;
+
+	usbdebug_re_enable((u32)res->base);
+	report_resource_stored(dev, res, "");
+	printk(BIOS_DEBUG, "%s EHCI Debug Port relocated\n", dev_path(dev));
+}
+
+void pci_ehci_read_resources(struct device *dev)
+{
+	pci_devfn_t dbg_dev = pci_ehci_dbg_dev(CONFIG_USBDEBUG_HCD_INDEX);
+
+	if (!ehci_drv_ops && pci_match_simple_dev(dev, dbg_dev)) {
+		memcpy(&ehci_dbg_ops, dev->ops, sizeof(ehci_dbg_ops));
+		ehci_drv_ops = dev->ops;
+		ehci_dbg_ops.set_resources = pci_ehci_set_resources;
+		dev->ops = &ehci_dbg_ops;
+		printk(BIOS_DEBUG, "%s EHCI BAR hook registered\n", dev_path(dev));
+	} else {
+		printk(BIOS_DEBUG, "More than one caller of %s from %s\n", __func__, dev_path(dev));
+	}
+
+	pci_dev_read_resources(dev);
+}
+#endif
+
+#if !defined(__PRE_RAM__) && !defined(__SMM__)
+static int get_usbdebug_from_cbmem(struct ehci_debug_info *info)
+{
+	struct ehci_debug_info *dbg_info_cbmem;
+
+	dbg_info_cbmem = cbmem_find(CBMEM_ID_EHCI_DEBUG);
+	if (dbg_info_cbmem == NULL)
+		return -1;
+
+	memcpy(info, dbg_info_cbmem, sizeof (*info));
+	printk(BIOS_DEBUG, "EHCI debug port found in CBMEM.\n");
+
+	return 0;
+}
+
+#elif defined(__PRE_RAM__)
+static void migrate_ehci_debug(void)
+{
+	struct ehci_debug_info *dbg_info = dbgp_ehci_info();
+	struct ehci_debug_info *dbg_info_cbmem;
+
+	dbg_info_cbmem = cbmem_add(CBMEM_ID_EHCI_DEBUG, sizeof(*dbg_info));
+	if (dbg_info_cbmem == NULL)
+		return;
+
+	memcpy(dbg_info_cbmem, dbg_info, sizeof(*dbg_info));
+}
+CAR_MIGRATE(migrate_ehci_debug);
+#endif
+
+unsigned long pci_ehci_base_regs(pci_devfn_t sdev)
+{
+#ifdef __SIMPLE_DEVICE__
+	unsigned long base = pci_read_config32(sdev, EHCI_BAR_INDEX) & ~0x0f;
+#else
+	device_t dev = dev_find_slot(PCI_DEV2SEGBUS(sdev), PCI_DEV2DEVFN(sdev));
+	unsigned long base = pci_read_config32(dev, EHCI_BAR_INDEX) & ~0x0f;
+#endif
+	return base + HC_LENGTH(read32(base));
+}
+
+int dbgp_ep_is_active(struct dbgp_pipe *pipe)
+{
+	return (pipe->status & DBGP_EP_STATMASK) == (DBGP_EP_VALID | DBGP_EP_ENABLED);
+}
+
+struct dbgp_pipe *dbgp_console_output(void)
+{
+	return &dbgp_ehci_info()->ep_pipe[DBGP_CONSOLE_EPOUT];
+}
+
+struct dbgp_pipe *dbgp_console_input(void)
+{
+	return &dbgp_ehci_info()->ep_pipe[DBGP_CONSOLE_EPIN];
+}
+
+int usbdebug_init(void)
+{
+	struct ehci_debug_info *dbg_info = dbgp_ehci_info();
+
+#if !defined(__PRE_RAM__) && !defined(__SMM__)
+	if (!get_usbdebug_from_cbmem(dbg_info))
+		return 0;
+#endif
+	enable_usbdebug();
+	return usbdebug_init_(CONFIG_EHCI_BAR, CONFIG_EHCI_DEBUG_OFFSET, dbg_info);
+}
diff --git a/src/drivers/usb/usb_ch9.h b/src/drivers/usb/usb_ch9.h
new file mode 100644
index 0000000000..b0aa7730f7
--- /dev/null
+++ b/src/drivers/usb/usb_ch9.h
@@ -0,0 +1,102 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007 AMD
+ * Written by Yinghai Lu <yinghai.lu@amd.com> for AMD.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
+ */
+
+#ifndef USB_CH9_H
+#define USB_CH9_H
+
+#define USB_DIR_OUT                     0               /* to device */
+#define USB_DIR_IN                      0x80            /* to host */
+
+/*
+ * USB types, the second of three bRequestType fields
+ */
+#define USB_TYPE_MASK                   (0x03 << 5)
+#define USB_TYPE_STANDARD               (0x00 << 5)
+#define USB_TYPE_CLASS                  (0x01 << 5)
+#define USB_TYPE_VENDOR                 (0x02 << 5)
+#define USB_TYPE_RESERVED               (0x03 << 5)
+/*
+ * USB recipients, the third of three bRequestType fields
+ */
+#define USB_RECIP_MASK                  0x1f
+#define USB_RECIP_DEVICE                0x00
+#define USB_RECIP_INTERFACE             0x01
+#define USB_RECIP_ENDPOINT              0x02
+#define USB_RECIP_OTHER                 0x03
+/* From Wireless USB 1.0 */
+#define USB_RECIP_PORT                  0x04
+#define USB_RECIP_RPIPE                 0x05
+
+/*
+ * Standard requests, for the bRequest field of a SETUP packet.
+ *
+ * These are qualified by the bRequestType field, so that for example
+ * TYPE_CLASS or TYPE_VENDOR specific feature flags could be retrieved
+ * by a GET_STATUS request.
+ */
+#define USB_REQ_GET_STATUS              0x00
+#define USB_REQ_CLEAR_FEATURE           0x01
+#define USB_REQ_SET_FEATURE             0x03
+#define USB_REQ_SET_ADDRESS             0x05
+#define USB_REQ_GET_DESCRIPTOR          0x06
+#define USB_REQ_SET_DESCRIPTOR          0x07
+#define USB_REQ_GET_CONFIGURATION       0x08
+#define USB_REQ_SET_CONFIGURATION       0x09
+#define USB_REQ_GET_INTERFACE           0x0A
+#define USB_REQ_SET_INTERFACE           0x0B
+#define USB_REQ_SYNCH_FRAME             0x0C
+
+#define USB_REQ_SET_ENCRYPTION          0x0D    /* Wireless USB */
+#define USB_REQ_GET_ENCRYPTION          0x0E
+#define USB_REQ_RPIPE_ABORT             0x0E
+#define USB_REQ_SET_HANDSHAKE           0x0F
+#define USB_REQ_RPIPE_RESET             0x0F
+#define USB_REQ_GET_HANDSHAKE           0x10
+#define USB_REQ_SET_CONNECTION          0x11
+#define USB_REQ_SET_SECURITY_DATA       0x12
+#define USB_REQ_GET_SECURITY_DATA       0x13
+#define USB_REQ_SET_WUSB_DATA           0x14
+#define USB_REQ_LOOPBACK_DATA_WRITE     0x15
+#define USB_REQ_LOOPBACK_DATA_READ      0x16
+#define USB_REQ_SET_INTERFACE_DS        0x17
+
+#define USB_DT_DEBUG                    0x0a
+
+#define USB_DEVICE_DEBUG_MODE           6       /* (special devices only) */
+
+struct usb_ctrlrequest {
+        u8  bRequestType;
+        u8  bRequest;
+        u16 wValue;
+        u16 wIndex;
+        u16 wLength;
+} __attribute__ ((packed));
+
+struct usb_debug_descriptor {
+        u8  bLength;
+        u8  bDescriptorType;
+
+        /* bulk endpoints with 8 byte maxpacket */
+        u8  bDebugInEndpoint;
+        u8  bDebugOutEndpoint;
+};
+
+#endif
+