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>

1 files changed, 527 insertions, 0 deletions

diff --git a/drivers/usb/host/imx21-dbg.c b/drivers/usb/host/imx21-dbg.c
new file mode 100644
index 0000000..512f647
--- /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
+