USB: MXC: Add i.MX21 specific USB host controller driver.

This driver is a Full / Low speed only USB host for the i.MX21.

Signed-off-by: Martin Fuzzey <mfuzzey@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

7 files changed, 2804 insertions, 0 deletions

diff --git a/arch/arm/plat-mxc/include/mach/mx21-usbhost.h b/arch/arm/plat-mxc/include/mach/mx21-usbhost.h
new file mode 100644
index 000000000000..22d0b596262c
--- /dev/null
+++ b/arch/arm/plat-mxc/include/mach/mx21-usbhost.h
@@ -0,0 +1,38 @@
+/*
+ *	Copyright (C) 2009 Martin Fuzzey <mfuzzey@gmail.com>
+ *
+ *	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.
+ */
+
+#ifndef __ASM_ARCH_MX21_USBH
+#define __ASM_ARCH_MX21_USBH
+
+enum mx21_usbh_xcvr {
+	/* Values below as used by hardware (HWMODE register) */
+	MX21_USBXCVR_TXDIF_RXDIF = 0,
+	MX21_USBXCVR_TXDIF_RXSE = 1,
+	MX21_USBXCVR_TXSE_RXDIF = 2,
+	MX21_USBXCVR_TXSE_RXSE = 3,
+};
+
+struct mx21_usbh_platform_data {
+	enum mx21_usbh_xcvr host_xcvr; /* tranceiver mode host 1,2 ports */
+	enum mx21_usbh_xcvr otg_xcvr; /* tranceiver mode otg (as host) port */
+	u16 	enable_host1:1,
+		enable_host2:1,
+		enable_otg_host:1, /* enable "OTG" port (as host) */
+		host1_xcverless:1, /* traceiverless host1 port */
+		host1_txenoe:1, /* output enable host1 transmit enable */
+		otg_ext_xcvr:1, /* external tranceiver for OTG port */
+		unused:10;
+};
+
+#endif /* __ASM_ARCH_MX21_USBH */
diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index be3c9b80bc9f..80b4008c89ba 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_USB_U132_HCD)	+= host/
 obj-$(CONFIG_USB_R8A66597_HCD)	+= host/
 obj-$(CONFIG_USB_HWA_HCD)	+= host/
 obj-$(CONFIG_USB_ISP1760_HCD)	+= host/
+obj-$(CONFIG_USB_IMX21_HCD)	+= host/
 
 obj-$(CONFIG_USB_C67X00_HCD)	+= c67x00/
 
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 2678a1624fcc..8d3df0397de3 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -399,3 +399,14 @@ config USB_HWA_HCD
 
 	  To compile this driver a module, choose M here: the module
 	  will be called "hwa-hc".
+
+config USB_IMX21_HCD
+       tristate "iMX21 HCD support"
+       depends on USB && ARM && MACH_MX21
+       help
+         This driver enables support for the on-chip USB host in the
+         iMX21 processor.
+
+         To compile this driver as a module, choose M here: the
+         module will be called "imx21-hcd".
+
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index f58b2494c44a..4e0c67f1f51b 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -32,3 +32,5 @@ obj-$(CONFIG_USB_U132_HCD)	+= u132-hcd.o
 obj-$(CONFIG_USB_R8A66597_HCD)	+= r8a66597-hcd.o
 obj-$(CONFIG_USB_ISP1760_HCD)	+= isp1760.o
 obj-$(CONFIG_USB_HWA_HCD)	+= hwa-hc.o
+obj-$(CONFIG_USB_IMX21_HCD)	+= imx21-hcd.o
+
diff --git a/drivers/usb/host/imx21-dbg.c b/drivers/usb/host/imx21-dbg.c
new file mode 100644
index 000000000000..512f647448ca
--- /dev/null
+++ b/drivers/usb/host/imx21-dbg.c
@@ -0,0 +1,527 @@
+/*
+ * Copyright (c) 2009 by Martin Fuzzey
+ *
+ * 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.
+ */
+
+/* this file is part of imx21-hcd.c */
+
+#ifndef DEBUG
+
+static inline void create_debug_files(struct imx21 *imx21) { }
+static inline void remove_debug_files(struct imx21 *imx21) { }
+static inline void debug_urb_submitted(struct imx21 *imx21, struct urb *urb) {}
+static inline void debug_urb_completed(struct imx21 *imx21, struct urb *urb,
+	int status) {}
+static inline void debug_urb_unlinked(struct imx21 *imx21, struct urb *urb) {}
+static inline void debug_urb_queued_for_etd(struct imx21 *imx21,
+	struct urb *urb) {}
+static inline void debug_urb_queued_for_dmem(struct imx21 *imx21,
+	struct urb *urb) {}
+static inline void debug_etd_allocated(struct imx21 *imx21) {}
+static inline void debug_etd_freed(struct imx21 *imx21) {}
+static inline void debug_dmem_allocated(struct imx21 *imx21, int size) {}
+static inline void debug_dmem_freed(struct imx21 *imx21, int size) {}
+static inline void debug_isoc_submitted(struct imx21 *imx21,
+	int frame, struct td *td) {}
+static inline void debug_isoc_completed(struct imx21 *imx21,
+	int frame, struct td *td, int cc, int len) {}
+
+#else
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+static const char *dir_labels[] = {
+	"TD 0",
+	"OUT",
+	"IN",
+	"TD 1"
+};
+
+static const char *speed_labels[] = {
+	"Full",
+	"Low"
+};
+
+static const char *format_labels[] = {
+	"Control",
+	"ISO",
+	"Bulk",
+	"Interrupt"
+};
+
+static inline struct debug_stats *stats_for_urb(struct imx21 *imx21,
+	struct urb *urb)
+{
+	return usb_pipeisoc(urb->pipe) ?
+		&imx21->isoc_stats : &imx21->nonisoc_stats;
+}
+
+static void debug_urb_submitted(struct imx21 *imx21, struct urb *urb)
+{
+	stats_for_urb(imx21, urb)->submitted++;
+}
+
+static void debug_urb_completed(struct imx21 *imx21, struct urb *urb, int st)
+{
+	if (st)
+		stats_for_urb(imx21, urb)->completed_failed++;
+	else
+		stats_for_urb(imx21, urb)->completed_ok++;
+}
+
+static void debug_urb_unlinked(struct imx21 *imx21, struct urb *urb)
+{
+	stats_for_urb(imx21, urb)->unlinked++;
+}
+
+static void debug_urb_queued_for_etd(struct imx21 *imx21, struct urb *urb)
+{
+	stats_for_urb(imx21, urb)->queue_etd++;
+}
+
+static void debug_urb_queued_for_dmem(struct imx21 *imx21, struct urb *urb)
+{
+	stats_for_urb(imx21, urb)->queue_dmem++;
+}
+
+static inline void debug_etd_allocated(struct imx21 *imx21)
+{
+	imx21->etd_usage.maximum = max(
+			++(imx21->etd_usage.value),
+			imx21->etd_usage.maximum);
+}
+
+static inline void debug_etd_freed(struct imx21 *imx21)
+{
+	imx21->etd_usage.value--;
+}
+
+static inline void debug_dmem_allocated(struct imx21 *imx21, int size)
+{
+	imx21->dmem_usage.value += size;
+	imx21->dmem_usage.maximum = max(
+			imx21->dmem_usage.value,
+			imx21->dmem_usage.maximum);
+}
+
+static inline void debug_dmem_freed(struct imx21 *imx21, int size)
+{
+	imx21->dmem_usage.value -= size;
+}
+
+
+static void debug_isoc_submitted(struct imx21 *imx21,
+	int frame, struct td *td)
+{
+	struct debug_isoc_trace *trace = &imx21->isoc_trace[
+		imx21->isoc_trace_index++];
+
+	imx21->isoc_trace_index %= ARRAY_SIZE(imx21->isoc_trace);
+	trace->schedule_frame = td->frame;
+	trace->submit_frame = frame;
+	trace->request_len = td->len;
+	trace->td = td;
+}
+
+static inline void debug_isoc_completed(struct imx21 *imx21,
+	int frame, struct td *td, int cc, int len)
+{
+	struct debug_isoc_trace *trace, *trace_failed;
+	int i;
+	int found = 0;
+
+	trace = imx21->isoc_trace;
+	for (i = 0; i < ARRAY_SIZE(imx21->isoc_trace); i++, trace++) {
+		if (trace->td == td) {
+			trace->done_frame = frame;
+			trace->done_len = len;
+			trace->cc = cc;
+			trace->td = NULL;
+			found = 1;
+			break;
+		}
+	}
+
+	if (found && cc) {
+		trace_failed = &imx21->isoc_trace_failed[
+					imx21->isoc_trace_index_failed++];
+
+		imx21->isoc_trace_index_failed %= ARRAY_SIZE(
+						imx21->isoc_trace_failed);
+		*trace_failed = *trace;
+	}
+}
+
+
+static char *format_ep(struct usb_host_endpoint *ep, char *buf, int bufsize)
+{
+	if (ep)
+		snprintf(buf, bufsize, "ep_%02x (type:%02X kaddr:%p)",
+			ep->desc.bEndpointAddress,
+			usb_endpoint_type(&ep->desc),
+			ep);
+	else
+		snprintf(buf, bufsize, "none");
+	return buf;
+}
+
+static char *format_etd_dword0(u32 value, char *buf, int bufsize)
+{
+	snprintf(buf, bufsize,
+		"addr=%d ep=%d dir=%s speed=%s format=%s halted=%d",
+		value & 0x7F,
+		(value >> DW0_ENDPNT) & 0x0F,
+		dir_labels[(value >> DW0_DIRECT) & 0x03],
+		speed_labels[(value >> DW0_SPEED) & 0x01],
+		format_labels[(value >> DW0_FORMAT) & 0x03],
+		(value >> DW0_HALTED) & 0x01);
+	return buf;
+}
+
+static int debug_status_show(struct seq_file *s, void *v)
+{
+	struct imx21 *imx21 = s->private;
+	int etds_allocated = 0;
+	int etds_sw_busy = 0;
+	int etds_hw_busy = 0;
+	int dmem_blocks = 0;
+	int queued_for_etd = 0;
+	int queued_for_dmem = 0;
+	unsigned int dmem_bytes = 0;
+	int i;
+	struct etd_priv *etd;
+	u32 etd_enable_mask;
+	unsigned long flags;
+	struct imx21_dmem_area *dmem;
+	struct ep_priv *ep_priv;
+
+	spin_lock_irqsave(&imx21->lock, flags);
+
+	etd_enable_mask = readl(imx21->regs + USBH_ETDENSET);
+	for (i = 0, etd = imx21->etd; i < USB_NUM_ETD; i++, etd++) {
+		if (etd->alloc)
+			etds_allocated++;
+		if (etd->urb)
+			etds_sw_busy++;
+		if (etd_enable_mask & (1<<i))
+			etds_hw_busy++;
+	}
+
+	list_for_each_entry(dmem, &imx21->dmem_list, list) {
+		dmem_bytes += dmem->size;
+		dmem_blocks++;
+	}
+
+	list_for_each_entry(ep_priv, &imx21->queue_for_etd, queue)
+		queued_for_etd++;
+
+	list_for_each_entry(etd, &imx21->queue_for_dmem, queue)
+		queued_for_dmem++;
+
+	spin_unlock_irqrestore(&imx21->lock, flags);
+
+	seq_printf(s,
+		"Frame: %d\n"
+		"ETDs allocated: %d/%d (max=%d)\n"
+		"ETDs in use sw: %d\n"
+		"ETDs in use hw: %d\n"
+		"DMEM alocated: %d/%d (max=%d)\n"
+		"DMEM blocks: %d\n"
+		"Queued waiting for ETD: %d\n"
+		"Queued waiting for DMEM: %d\n",
+		readl(imx21->regs + USBH_FRMNUB) & 0xFFFF,
+		etds_allocated, USB_NUM_ETD, imx21->etd_usage.maximum,
+		etds_sw_busy,
+		etds_hw_busy,
+		dmem_bytes, DMEM_SIZE, imx21->dmem_usage.maximum,
+		dmem_blocks,
+		queued_for_etd,
+		queued_for_dmem);
+
+	return 0;
+}
+
+static int debug_dmem_show(struct seq_file *s, void *v)
+{
+	struct imx21 *imx21 = s->private;
+	struct imx21_dmem_area *dmem;
+	unsigned long flags;
+	char ep_text[40];
+
+	spin_lock_irqsave(&imx21->lock, flags);
+
+	list_for_each_entry(dmem, &imx21->dmem_list, list)
+		seq_printf(s,
+			"%04X: size=0x%X "
+			"ep=%s\n",
+			dmem->offset, dmem->size,
+			format_ep(dmem->ep, ep_text, sizeof(ep_text)));
+
+	spin_unlock_irqrestore(&imx21->lock, flags);
+
+	return 0;
+}
+
+static int debug_etd_show(struct seq_file *s, void *v)
+{
+	struct imx21 *imx21 = s->private;
+	struct etd_priv *etd;
+	char buf[60];
+	u32 dword;
+	int i, j;
+	unsigned long flags;
+
+	spin_lock_irqsave(&imx21->lock, flags);
+
+	for (i = 0, etd = imx21->etd; i < USB_NUM_ETD; i++, etd++) {
+		int state = -1;
+		struct urb_priv *urb_priv;
+		if (etd->urb) {
+			urb_priv = etd->urb->hcpriv;
+			if (urb_priv)
+				state = urb_priv->state;
+		}
+
+		seq_printf(s,
+			"etd_num: %d\n"
+			"ep: %s\n"
+			"alloc: %d\n"
+			"len: %d\n"
+			"busy sw: %d\n"
+			"busy hw: %d\n"
+			"urb state: %d\n"
+			"current urb: %p\n",
+
+			i,
+			format_ep(etd->ep, buf, sizeof(buf)),
+			etd->alloc,
+			etd->len,
+			etd->urb != NULL,
+			(readl(imx21->regs + USBH_ETDENSET) & (1 << i)) > 0,
+			state,
+			etd->urb);
+
+		for (j = 0; j < 4; j++) {
+			dword = etd_readl(imx21, i, j);
+			switch (j) {
+			case 0:
+				format_etd_dword0(dword, buf, sizeof(buf));
+				break;
+			case 2:
+				snprintf(buf, sizeof(buf),
+					"cc=0X%02X", dword >> DW2_COMPCODE);
+				break;
+			default:
+				*buf = 0;
+				break;
+			}
+			seq_printf(s,
+				"dword %d: submitted=%08X cur=%08X [%s]\n",
+				j,
+				etd->submitted_dwords[j],
+				dword,
+				buf);
+		}
+		seq_printf(s, "\n");
+	}
+
+	spin_unlock_irqrestore(&imx21->lock, flags);
+
+	return 0;
+}
+
+static void debug_statistics_show_one(struct seq_file *s,
+	const char *name, struct debug_stats *stats)
+{
+	seq_printf(s, "%s:\n"
+		"submitted URBs: %lu\n"
+		"completed OK: %lu\n"
+		"completed failed: %lu\n"
+		"unlinked: %lu\n"
+		"queued for ETD: %lu\n"
+		"queued for DMEM: %lu\n\n",
+		name,
+		stats->submitted,
+		stats->completed_ok,
+		stats->completed_failed,
+		stats->unlinked,
+		stats->queue_etd,
+		stats->queue_dmem);
+}
+
+static int debug_statistics_show(struct seq_file *s, void *v)
+{
+	struct imx21 *imx21 = s->private;
+	unsigned long flags;
+
+	spin_lock_irqsave(&imx21->lock, flags);
+
+	debug_statistics_show_one(s, "nonisoc", &imx21->nonisoc_stats);
+	debug_statistics_show_one(s, "isoc", &imx21->isoc_stats);
+	seq_printf(s, "unblock kludge triggers: %lu\n", imx21->debug_unblocks);
+	spin_unlock_irqrestore(&imx21->lock, flags);
+
+	return 0;
+}
+
+static void debug_isoc_show_one(struct seq_file *s,
+	const char *name, int index, 	struct debug_isoc_trace *trace)
+{
+	seq_printf(s, "%s %d:\n"
+		"cc=0X%02X\n"
+		"scheduled frame %d (%d)\n"
+		"submittted frame %d (%d)\n"
+		"completed frame %d (%d)\n"
+		"requested length=%d\n"
+		"completed length=%d\n\n",
+		name, index,
+		trace->cc,
+		trace->schedule_frame, trace->schedule_frame & 0xFFFF,
+		trace->submit_frame, trace->submit_frame & 0xFFFF,
+		trace->done_frame, trace->done_frame & 0xFFFF,
+		trace->request_len,
+		trace->done_len);
+}
+
+static int debug_isoc_show(struct seq_file *s, void *v)
+{
+	struct imx21 *imx21 = s->private;
+	struct debug_isoc_trace *trace;
+	unsigned long flags;
+	int i;
+
+	spin_lock_irqsave(&imx21->lock, flags);
+
+	trace = imx21->isoc_trace_failed;
+	for (i = 0; i < ARRAY_SIZE(imx21->isoc_trace_failed); i++, trace++)
+		debug_isoc_show_one(s, "isoc failed", i, trace);
+
+	trace = imx21->isoc_trace;
+	for (i = 0; i < ARRAY_SIZE(imx21->isoc_trace); i++, trace++)
+		debug_isoc_show_one(s, "isoc", i, trace);
+
+	spin_unlock_irqrestore(&imx21->lock, flags);
+
+	return 0;
+}
+
+static int debug_status_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, debug_status_show, inode->i_private);
+}
+
+static int debug_dmem_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, debug_dmem_show, inode->i_private);
+}
+
+static int debug_etd_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, debug_etd_show, inode->i_private);
+}
+
+static int debug_statistics_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, debug_statistics_show, inode->i_private);
+}
+
+static int debug_isoc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, debug_isoc_show, inode->i_private);
+}
+
+static const struct file_operations debug_status_fops = {
+	.open = debug_status_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+static const struct file_operations debug_dmem_fops = {
+	.open = debug_dmem_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+static const struct file_operations debug_etd_fops = {
+	.open = debug_etd_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+static const struct file_operations debug_statistics_fops = {
+	.open = debug_statistics_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+static const struct file_operations debug_isoc_fops = {
+	.open = debug_isoc_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+static void create_debug_files(struct imx21 *imx21)
+{
+	imx21->debug_root = debugfs_create_dir(dev_name(imx21->dev), NULL);
+	if (!imx21->debug_root)
+		goto failed_create_rootdir;
+
+	if (!debugfs_create_file("status", S_IRUGO,
+			imx21->debug_root, imx21, &debug_status_fops))
+		goto failed_create;
+
+	if (!debugfs_create_file("dmem", S_IRUGO,
+			imx21->debug_root, imx21, &debug_dmem_fops))
+		goto failed_create;
+
+	if (!debugfs_create_file("etd", S_IRUGO,
+			imx21->debug_root, imx21, &debug_etd_fops))
+		goto failed_create;
+
+	if (!debugfs_create_file("statistics", S_IRUGO,
+			imx21->debug_root, imx21, &debug_statistics_fops))
+		goto failed_create;
+
+	if (!debugfs_create_file("isoc", S_IRUGO,
+			imx21->debug_root, imx21, &debug_isoc_fops))
+		goto failed_create;
+
+	return;
+
+failed_create:
+	debugfs_remove_recursive(imx21->debug_root);
+
+failed_create_rootdir:
+	imx21->debug_root = NULL;
+}
+
+
+static void remove_debug_files(struct imx21 *imx21)
+{
+	if (imx21->debug_root) {
+		debugfs_remove_recursive(imx21->debug_root);
+		imx21->debug_root = NULL;
+	}
+}
+
+#endif
+
diff --git a/drivers/usb/host/imx21-hcd.c b/drivers/usb/host/imx21-hcd.c
new file mode 100644
index 000000000000..213e270e1c29
--- /dev/null
+++ b/drivers/usb/host/imx21-hcd.c
@@ -0,0 +1,1789 @@
+/*
+ * USB Host Controller Driver for IMX21
+ *
+ * Copyright (C) 2006 Loping Dog Embedded Systems
+ * Copyright (C) 2009 Martin Fuzzey
+ * Originally written by Jay Monkman <jtm@lopingdog.com>
+ * Ported to 2.6.30, debugged and enhanced by Martin Fuzzey
+ *
+ * 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.
+ */
+
+
+ /*
+  * The i.MX21 USB hardware contains
+  *    * 32 transfer descriptors (called ETDs)
+  *    * 4Kb of Data memory
+  *
+  * The data memory is shared between the host and fuction controlers
+  * (but this driver only supports the host controler)
+  *
+  * So setting up a transfer involves:
+  *    * Allocating a ETD
+  *    * Fill in ETD with appropriate information
+  *    * Allocating data memory (and putting the offset in the ETD)
+  *    * Activate the ETD
+  *    * Get interrupt when done.
+  *
+  * An ETD is assigned to each active endpoint.
+  *
+  * Low resource (ETD and Data memory) situations are handled differently for
+  * isochronous and non insosynchronous transactions :
+  *
+  * Non ISOC transfers are queued if either ETDs or Data memory are unavailable
+  *
+  * ISOC transfers use 2 ETDs per endpoint to achieve double buffering.
+  * They allocate both ETDs and Data memory during URB submission
+  * (and fail if unavailable).
+  */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/platform_device.h>
+#include <linux/usb.h>
+
+#include "../core/hcd.h"
+#include "imx21-hcd.h"
+
+#ifdef DEBUG
+#define DEBUG_LOG_FRAME(imx21, etd, event) \
+	(etd)->event##_frame = readl((imx21)->regs + USBH_FRMNUB)
+#else
+#define DEBUG_LOG_FRAME(imx21, etd, event) do { } while (0)
+#endif
+
+static const char hcd_name[] = "imx21-hcd";
+
+static inline struct imx21 *hcd_to_imx21(struct usb_hcd *hcd)
+{
+	return (struct imx21 *)hcd->hcd_priv;
+}
+
+
+/* =========================================== */
+/* Hardware access helpers			*/
+/* =========================================== */
+
+static inline void set_register_bits(struct imx21 *imx21, u32 offset, u32 mask)
+{
+	void __iomem *reg = imx21->regs + offset;
+	writel(readl(reg) | mask, reg);
+}
+
+static inline void clear_register_bits(struct imx21 *imx21,
+	u32 offset, u32 mask)
+{
+	void __iomem *reg = imx21->regs + offset;
+	writel(readl(reg) & ~mask, reg);
+}
+
+static inline void clear_toggle_bit(struct imx21 *imx21, u32 offset, u32 mask)
+{
+	void __iomem *reg = imx21->regs + offset;
+
+	if (readl(reg) & mask)
+		writel(mask, reg);
+}
+
+static inline void set_toggle_bit(struct imx21 *imx21, u32 offset, u32 mask)
+{
+	void __iomem *reg = imx21->regs + offset;
+
+	if (!(readl(reg) & mask))
+		writel(mask, reg);
+}
+
+static void etd_writel(struct imx21 *imx21, int etd_num, int dword, u32 value)
+{
+	writel(value, imx21->regs + USB_ETD_DWORD(etd_num, dword));
+}
+
+static u32 etd_readl(struct imx21 *imx21, int etd_num, int dword)
+{
+	return readl(imx21->regs + USB_ETD_DWORD(etd_num, dword));
+}
+
+static inline int wrap_frame(int counter)
+{
+	return counter & 0xFFFF;
+}
+
+static inline int frame_after(int frame, int after)
+{
+	/* handle wrapping like jiffies time_afer */
+	return (s16)((s16)after - (s16)frame) < 0;
+}
+
+static int imx21_hc_get_frame(struct usb_hcd *hcd)
+{
+	struct imx21 *imx21 = hcd_to_imx21(hcd);
+
+	return wrap_frame(readl(imx21->regs + USBH_FRMNUB));
+}
+
+
+#include "imx21-dbg.c"
+
+/* =========================================== */
+/* ETD management				*/
+/* ===========================================	*/
+
+static int alloc_etd(struct imx21 *imx21)
+{
+	int i;
+	struct etd_priv *etd = imx21->etd;
+
+	for (i = 0; i < USB_NUM_ETD; i++, etd++) {
+		if (etd->alloc == 0) {
+			memset(etd, 0, sizeof(imx21->etd[0]));
+			etd->alloc = 1;
+			debug_etd_allocated(imx21);
+			return i;
+		}
+	}
+	return -1;
+}
+
+static void disactivate_etd(struct imx21 *imx21, int num)
+{
+	int etd_mask = (1 << num);
+	struct etd_priv *etd = &imx21->etd[num];
+
+	writel(etd_mask, imx21->regs + USBH_ETDENCLR);
+	clear_register_bits(imx21, USBH_ETDDONEEN, etd_mask);
+	writel(etd_mask, imx21->regs + USB_ETDDMACHANLCLR);
+	clear_toggle_bit(imx21, USBH_ETDDONESTAT, etd_mask);
+
+	etd->active_count = 0;
+
+	DEBUG_LOG_FRAME(imx21, etd, disactivated);
+}
+
+static void reset_etd(struct imx21 *imx21, int num)
+{
+	struct etd_priv *etd = imx21->etd + num;
+	int i;
+
+	disactivate_etd(imx21, num);
+
+	for (i = 0; i < 4; i++)
+		etd_writel(imx21, num, i, 0);
+	etd->urb = NULL;
+	etd->ep = NULL;
+	etd->td = NULL;;
+}
+
+static void free_etd(struct imx21 *imx21, int num)
+{
+	if (num < 0)
+		return;
+
+	if (num >= USB_NUM_ETD) {
+		dev_err(imx21->dev, "BAD etd=%d!\n", num);
+		return;
+	}
+	if (imx21->etd[num].alloc == 0) {
+		dev_err(imx21->dev, "ETD %d already free!\n", num);
+		return;
+	}
+
+	debug_etd_freed(imx21);
+	reset_etd(imx21, num);
+	memset(&imx21->etd[num], 0, sizeof(imx21->etd[0]));
+}
+
+
+static void setup_etd_dword0(struct imx21 *imx21,
+	int etd_num, struct urb *urb,  u8 dir, u16 maxpacket)
+{
+	etd_writel(imx21, etd_num, 0,
+		((u32) usb_pipedevice(urb->pipe)) <<  DW0_ADDRESS |
+		((u32) usb_pipeendpoint(urb->pipe) << DW0_ENDPNT) |
+		((u32) dir << DW0_DIRECT) |
+		((u32) ((urb->dev->speed == USB_SPEED_LOW) ?
+			1 : 0) << DW0_SPEED) |
+		((u32) fmt_urb_to_etd[usb_pipetype(urb->pipe)] << DW0_FORMAT) |
+		((u32) maxpacket << DW0_MAXPKTSIZ));
+}
+
+static void activate_etd(struct imx21 *imx21,
+	int etd_num, dma_addr_t dma, u8 dir)
+{
+	u32 etd_mask = 1 << etd_num;
+	struct etd_priv *etd = &imx21->etd[etd_num];
+
+	clear_toggle_bit(imx21, USBH_ETDDONESTAT, etd_mask);
+	set_register_bits(imx21, USBH_ETDDONEEN, etd_mask);
+	clear_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask);
+	clear_toggle_bit(imx21, USBH_YFILLSTAT, etd_mask);
+
+	if (dma) {
+		set_register_bits(imx21, USB_ETDDMACHANLCLR, etd_mask);
+		clear_toggle_bit(imx21, USBH_XBUFSTAT, etd_mask);
+		clear_toggle_bit(imx21, USBH_YBUFSTAT, etd_mask);
+		writel(dma, imx21->regs + USB_ETDSMSA(etd_num));
+		set_register_bits(imx21, USB_ETDDMAEN, etd_mask);
+	} else {
+		if (dir != TD_DIR_IN) {
+			/* need to set for ZLP */
+			set_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask);
+			set_toggle_bit(imx21, USBH_YFILLSTAT, etd_mask);
+		}
+	}
+
+	DEBUG_LOG_FRAME(imx21, etd, activated);
+
+#ifdef DEBUG
+	if (!etd->active_count) {
+		int i;
+		etd->activated_frame = readl(imx21->regs + USBH_FRMNUB);
+		etd->disactivated_frame = -1;
+		etd->last_int_frame = -1;
+		etd->last_req_frame = -1;
+
+		for (i = 0; i < 4; i++)
+			etd->submitted_dwords[i] = etd_readl(imx21, etd_num, i);
+	}
+#endif
+
+	etd->active_count = 1;
+	writel(etd_mask, imx21->regs + USBH_ETDENSET);
+}
+
+/* ===========================================	*/
+/* Data memory management			*/
+/* ===========================================	*/
+
+static int alloc_dmem(struct imx21 *imx21, unsigned int size,
+		      struct usb_host_endpoint *ep)
+{
+	unsigned int offset = 0;
+	struct imx21_dmem_area *area;
+	struct imx21_dmem_area *tmp;
+
+	size += (~size + 1) & 0x3; /* Round to 4 byte multiple */
+
+	if (size > DMEM_SIZE) {
+		dev_err(imx21->dev, "size=%d > DMEM_SIZE(%d)\n",
+			size, DMEM_SIZE);
+		return -EINVAL;
+	}
+
+	list_for_each_entry(tmp, &imx21->dmem_list, list) {
+		if ((size + offset) < offset)
+			goto fail;
+		if ((size + offset) <= tmp->offset)
+			break;
+		offset = tmp->size + tmp->offset;
+		if ((offset + size) > DMEM_SIZE)
+			goto fail;
+	}
+
+	area = kmalloc(sizeof(struct imx21_dmem_area), GFP_ATOMIC);
+	if (area == NULL)
+		return -ENOMEM;
+
+	area->ep = ep;
+	area->offset = offset;
+	area->size = size;
+	list_add_tail(&area->list, &tmp->list);
+	debug_dmem_allocated(imx21, size);
+	return offset;
+
+fail:
+	return -ENOMEM;
+}
+
+/* Memory now available for a queued ETD - activate it */
+static void activate_queued_etd(struct imx21 *imx21,
+	struct etd_priv *etd, u32 dmem_offset)
+{
+	struct urb_priv *urb_priv = etd->urb->hcpriv;
+	int etd_num = etd - &imx21->etd[0];
+	u32 maxpacket = etd_readl(imx21, etd_num, 1) >> DW1_YBUFSRTAD;
+	u8 dir = (etd_readl(imx21, etd_num, 2) >> DW2_DIRPID) & 0x03;
+
+	dev_dbg(imx21->dev, "activating queued ETD %d now DMEM available\n",
+		etd_num);
+	etd_writel(imx21, etd_num, 1,
+	    ((dmem_offset + maxpacket) << DW1_YBUFSRTAD) | dmem_offset);
+
+	urb_priv->active = 1;
+	activate_etd(imx21, etd_num, etd->dma_handle, dir);
+}
+
+static void free_dmem(struct imx21 *imx21, int offset)
+{
+	struct imx21_dmem_area *area;
+	struct etd_priv *etd, *tmp;
+	int found = 0;
+
+	list_for_each_entry(area, &imx21->dmem_list, list) {
+		if (area->offset == offset) {
+			debug_dmem_freed(imx21, area->size);
+			list_del(&area->list);
+			kfree(area);
+			found = 1;
+			break;
+		}
+	}
+
+	if (!found)  {
+		dev_err(imx21->dev,
+			"Trying to free unallocated DMEM %d\n", offset);
+		return;
+	}
+
+	/* Try again to allocate memory for anything we've queued */
+	list_for_each_entry_safe(etd, tmp, &imx21->queue_for_dmem, queue) {
+		offset = alloc_dmem(imx21, etd->dmem_size, etd->ep);
+		if (offset >= 0) {
+			list_del(&etd->queue);
+			activate_queued_etd(imx21, etd, (u32)offset);
+		}
+	}
+}
+
+static void free_epdmem(struct imx21 *imx21, struct usb_host_endpoint *ep)
+{
+	struct imx21_dmem_area *area, *tmp;
+
+	list_for_each_entry_safe(area, tmp, &imx21->dmem_list, list) {
+		if (area->ep == ep) {
+			dev_err(imx21->dev,
+				"Active DMEM %d for disabled ep=%p\n",
+				area->offset, ep);
+			list_del(&area->list);
+			kfree(area);
+		}
+	}
+}
+
+
+/* ===========================================	*/
+/* End handling 				*/
+/* ===========================================	*/
+static void schedule_nonisoc_etd(struct imx21 *imx21, struct urb *urb);
+
+/* Endpoint now idle - release it's ETD(s) or asssign to queued request */
+static void ep_idle(struct imx21 *imx21, struct ep_priv *ep_priv)
+{
+	int etd_num;
+	int i;
+
+	for (i = 0; i < NUM_ISO_ETDS; i++) {
+		etd_num = ep_priv->etd[i];
+		if (etd_num < 0)
+			continue;
+
+		ep_priv->etd[i] = -1;
+		if (list_empty(&imx21->queue_for_etd)) {
+			free_etd(imx21, etd_num);
+			continue;
+		}
+
+		dev_dbg(imx21->dev,
+			"assigning idle etd %d for queued request\n", etd_num);
+		ep_priv = list_first_entry(&imx21->queue_for_etd,
+			struct ep_priv, queue);
+		list_del(&ep_priv->queue);
+		reset_etd(imx21, etd_num);
+		ep_priv->waiting_etd = 0;
+		ep_priv->etd[i] = etd_num;
+
+		if (list_empty(&ep_priv->ep->urb_list)) {
+			dev_err(imx21->dev, "No urb for queued ep!\n");
+			continue;
+		}
+		schedule_nonisoc_etd(imx21, list_first_entry(
+			&ep_priv->ep->urb_list, struct urb, urb_list));
+	}
+}
+
+static void urb_done(struct usb_hcd *hcd, struct urb *urb, int status)
+__releases(imx21->lock)
+__acquires(imx21->lock)
+{
+	struct imx21 *imx21 = hcd_to_imx21(hcd);
+	struct ep_priv *ep_priv = urb->ep->hcpriv;
+	struct urb_priv *urb_priv = urb->hcpriv;
+
+	debug_urb_completed(imx21, urb, status);
+	dev_vdbg(imx21->dev, "urb %p done %d\n", urb, status);
+
+	kfree(urb_priv->isoc_td);
+	kfree(urb->hcpriv);
+	urb->hcpriv = NULL;
+	usb_hcd_unlink_urb_from_ep(hcd, urb);
+	spin_unlock(&imx21->lock);
+	usb_hcd_giveback_urb(hcd, urb, status);
+	spin_lock(&imx21->lock);
+	if (list_empty(&ep_priv->ep->urb_list))
+		ep_idle(imx21, ep_priv);
+}
+
+/* ===========================================	*/
+/* ISOC Handling ... 				*/
+/* ===========================================	*/
+
+static void schedule_isoc_etds(struct usb_hcd *hcd,
+	struct usb_host_endpoint *ep)
+{
+	struct imx21 *imx21 = hcd_to_imx21(hcd);
+	struct ep_priv *ep_priv = ep->hcpriv;
+	struct etd_priv *etd;
+	struct urb_priv *urb_priv;
+	struct td *td;
+	int etd_num;
+	int i;
+	int cur_frame;
+	u8 dir;
+
+	for (i = 0; i < NUM_ISO_ETDS; i++) {
+too_late:
+		if (list_empty(&ep_priv->td_list))
+			break;
+
+		etd_num = ep_priv->etd[i];
+		if (etd_num < 0)
+			break;
+
+		etd = &imx21->etd[etd_num];
+		if (etd->urb)
+			continue;
+
+		td = list_entry(ep_priv->td_list.next, struct td, list);
+		list_del(&td->list);
+		urb_priv = td->urb->hcpriv;
+
+		cur_frame = imx21_hc_get_frame(hcd);
+		if (frame_after(cur_frame, td->frame)) {
+			dev_dbg(imx21->dev, "isoc too late frame %d > %d\n",
+				cur_frame, td->frame);
+			urb_priv->isoc_status = -EXDEV;
+			td->urb->iso_frame_desc[
+				td->isoc_index].actual_length = 0;
+			td->urb->iso_frame_desc[td->isoc_index].status = -EXDEV;
+			if (--urb_priv->isoc_remaining == 0)
+				urb_done(hcd, td->urb, urb_priv->isoc_status);
+			goto too_late;
+		}
+
+		urb_priv->active = 1;
+		etd->td = td;
+		etd->ep = td->ep;
+		etd->urb = td->urb;
+		etd->len = td->len;
+
+		debug_isoc_submitted(imx21, cur_frame, td);
+
+		dir = usb_pipeout(td->urb->pipe) ? TD_DIR_OUT : TD_DIR_IN;
+		setup_etd_dword0(imx21, etd_num, td->urb, dir, etd->dmem_size);
+		etd_writel(imx21, etd_num, 1, etd->dmem_offset);
+		etd_writel(imx21, etd_num, 2,
+			(TD_NOTACCESSED << DW2_COMPCODE) |
+			((td->frame & 0xFFFF) << DW2_STARTFRM));
+		etd_writel(imx21, etd_num, 3,
+			(TD_NOTACCESSED << DW3_COMPCODE0) |
+			(td->len << DW3_PKTLEN