Digi Release Code - 02142011 Missing Files Fix2.6.31-digi-201102141503

1 files changed, 307 insertions, 0 deletions

diff --git a/drivers/mtd/nand/gpmi-nfc/gpmi-nfc-event-reporting.c b/drivers/mtd/nand/gpmi-nfc/gpmi-nfc-event-reporting.c
new file mode 100644
index 000000000000..45574391b0f0
--- /dev/null
+++ b/drivers/mtd/nand/gpmi-nfc/gpmi-nfc-event-reporting.c
@@ -0,0 +1,307 @@
+/*
+ * Freescale GPMI NFC NAND Flash Driver
+ *
+ * Copyright (C) 2010 Freescale Semiconductor, Inc.
+ * Copyright (C) 2008 Embedded Alley Solutions, Inc.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "gpmi-nfc.h"
+
+#if defined(EVENT_REPORTING)
+
+/*
+ * This variable and module parameter controls whether the driver reports event
+ * information by printing to the console.
+ */
+
+static int report_events;
+module_param(report_events, int, 0600);
+
+/**
+ * struct event - A single record in the event trace.
+ *
+ * @time:         The time at which the event occurred.
+ * @nesting:      Indicates function call nesting.
+ * @description:  A description of the event.
+ */
+
+struct event {
+	ktime_t       time;
+	unsigned int  nesting;
+	char          *description;
+};
+
+/**
+ * The event trace.
+ *
+ * @overhead:  The delay to take a time stamp and nothing else.
+ * @nesting:   The current nesting level.
+ * @overflow:  Indicates the trace overflowed.
+ * @next:      Index of the next event to write.
+ * @events:    The array of events.
+ */
+
+#define MAX_EVENT_COUNT  (200)
+
+static struct {
+	ktime_t       overhead;
+	int           nesting;
+	int           overflow;
+	unsigned int  next;
+	struct event  events[MAX_EVENT_COUNT];
+} event_trace;
+
+/**
+ * gpmi_nfc_reset_event_trace() - Resets the event trace.
+ */
+void gpmi_nfc_reset_event_trace(void)
+{
+	event_trace.nesting  = 0;
+	event_trace.overflow = false;
+	event_trace.next     = 0;
+}
+
+/**
+ * gpmi_nfc_add_event() - Adds an event to the event trace.
+ *
+ * @description:  A description of the event.
+ * @delta:        A delta to the nesting level for this event [-1, 0, 1].
+ */
+void gpmi_nfc_add_event(char *description, int delta)
+{
+	struct event  *event;
+
+	if (!report_events)
+		return;
+
+	if (event_trace.overflow)
+		return;
+
+	if (event_trace.next >= MAX_EVENT_COUNT) {
+		event_trace.overflow = true;
+		return;
+	}
+
+	event = event_trace.events + event_trace.next;
+
+	event->time = ktime_get();
+
+	event->description = description;
+
+	if (!delta)
+		event->nesting = event_trace.nesting;
+	else if (delta < 0) {
+		event->nesting = event_trace.nesting - 1;
+		event_trace.nesting -= 2;
+	} else {
+		event->nesting = event_trace.nesting + 1;
+		event_trace.nesting += 2;
+	}
+
+	if (event_trace.nesting < 0)
+		event_trace.nesting = 0;
+
+	event_trace.next++;
+
+}
+
+/**
+ * gpmi_nfc_start_event_trace() - Starts an event trace.
+ *
+ * @description:  A description of the first event.
+ */
+void gpmi_nfc_start_event_trace(char *description)
+{
+
+	ktime_t  t0;
+	ktime_t  t1;
+
+	if (!report_events)
+		return;
+
+	gpmi_nfc_reset_event_trace();
+
+	t0 = ktime_get();
+	t1 = ktime_get();
+
+	event_trace.overhead = ktime_sub(t1, t0);
+
+	gpmi_nfc_add_event(description, 1);
+
+}
+
+/**
+ * gpmi_nfc_dump_event_trace() - Dumps the event trace.
+ */
+void gpmi_nfc_dump_event_trace(void)
+{
+	unsigned int  i;
+	time_t        seconds;
+	long          nanoseconds;
+	char          line[100];
+	int           o;
+	struct event  *first_event;
+	struct event  *last_event;
+	struct event  *matching_event;
+	struct event  *event;
+	ktime_t       delta;
+
+	/* Check if event reporting is turned off. */
+
+	if (!report_events)
+		return;
+
+	/* Print important facts about this event trace. */
+
+	pr_info("\n+----------------\n");
+
+	pr_info("|  Overhead    : [%d:%d]\n", event_trace.overhead.tv.sec,
+						event_trace.overhead.tv.nsec);
+
+	if (!event_trace.next) {
+		pr_info("|  No Events\n");
+		return;
+	}
+
+	first_event = event_trace.events;
+	last_event  = event_trace.events + (event_trace.next - 1);
+
+	delta = ktime_sub(last_event->time, first_event->time);
+	pr_info("|  Elapsed Time: [%d:%d]\n", delta.tv.sec, delta.tv.nsec);
+
+	if (event_trace.overflow)
+		pr_info("|  Overflow!\n");
+
+	/* Print the events in this history. */
+
+	for (i = 0, event = event_trace.events;
+					i < event_trace.next; i++, event++) {
+
+		/* Get the delta between this event and the previous event. */
+
+		if (!i) {
+			seconds     = 0;
+			nanoseconds = 0;
+		} else {
+			delta = ktime_sub(event[0].time, event[-1].time);
+			seconds     = delta.tv.sec;
+			nanoseconds = delta.tv.nsec;
+		}
+
+		/* Print the current event. */
+
+		o = 0;
+
+		o = snprintf(line, sizeof(line) - o, "|  [%ld:% 10ld]%*s %s",
+							seconds, nanoseconds,
+							event->nesting, "",
+							event->description);
+		/* Check if this is the last event in a nested series. */
+
+		if (i && (event[0].nesting < event[-1].nesting)) {
+
+			for (matching_event = event - 1;; matching_event--) {
+
+				if (matching_event < event_trace.events) {
+					matching_event = 0;
+					break;
+				}
+
+				if (matching_event->nesting == event->nesting)
+					break;
+
+			}
+
+			if (matching_event) {
+				delta = ktime_sub(event->time,
+							matching_event->time);
+				o += snprintf(line + o, sizeof(line) - o,
+						" <%d:%d]", delta.tv.sec,
+								delta.tv.nsec);
+			}
+
+		}
+
+		/* Check if this is the first event in a nested series. */
+
+		if ((i < event_trace.next - 1) &&
+				(event[0].nesting < event[1].nesting)) {
+
+			for (matching_event = event + 1;; matching_event++) {
+
+				if (matching_event >=
+					(event_trace.events+event_trace.next)) {
+					matching_event = 0;
+					break;
+				}
+
+				if (matching_event->nesting == event->nesting)
+					break;
+
+			}
+
+			if (matching_event) {
+				delta = ktime_sub(matching_event->time,
+								event->time);
+				o += snprintf(line + o, sizeof(line) - o,
+						" [%d:%d>", delta.tv.sec,
+								delta.tv.nsec);
+			}
+
+		}
+
+		pr_info("%s\n", line);
+
+	}
+
+	pr_info("+----------------\n");
+
+}
+
+/**
+ * gpmi_nfc_stop_event_trace() - Stops an event trace.
+ *
+ * @description:  A description of the last event.
+ */
+void gpmi_nfc_stop_event_trace(char *description)
+{
+	struct event  *event;
+
+	if (!report_events)
+		return;
+
+	/*
+	 * We want the end of the trace, no matter what happens. If the trace
+	 * has already overflowed, or is about to, just jam this event into the
+	 * last spot. Otherwise, add this event like any other.
+	 */
+
+	if (event_trace.overflow || (event_trace.next >= MAX_EVENT_COUNT)) {
+		event = event_trace.events + (MAX_EVENT_COUNT - 1);
+		event->time = ktime_get();
+		event->description = description;
+		event->nesting     = 0;
+	} else {
+		gpmi_nfc_add_event(description, -1);
+	}
+
+	gpmi_nfc_dump_event_trace();
+	gpmi_nfc_reset_event_trace();
+
+}
+
+#endif /* EVENT_REPORTING */