Cortex-A8: support "reset-assert" event

Use the new "reset-assert" event; else SRST; else fail.
Tested on an OMAP3, using the event.

NOTE:  still doesn't handle "reset halt".  For some reason
neither VCR nor PRCR seemed effective; they held the value
that was written, but VCR didn't trigger debug entry when
the reset vector fired (maybe the vector needs configuring?)
and PRCR refused to hold the chip in reset until deassert()
could force the core into debug state.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

1 files changed, 28 insertions, 5 deletions

diff --git a/src/target/cortex_a8.c b/src/target/cortex_a8.c
index b85481a9..8402081d 100644
--- a/src/target/cortex_a8.c
+++ b/src/target/cortex_a8.c
@@ -1246,6 +1246,21 @@ static int cortex_a8_assert_reset(struct target *target)
 
 	LOG_DEBUG(" ");
 
+	/* FIXME when halt is requested, make it work somehow... */
+
+	/* Issue some kind of warm reset. */
+	if (target_has_event_action(target, TARGET_EVENT_RESET_ASSERT)) {
+		target_handle_event(target, TARGET_EVENT_RESET_ASSERT);
+	} else if (jtag_get_reset_config() & RESET_HAS_SRST) {
+		/* REVISIT handle "pulls" cases, if there's
+		 * hardware that needs them to work.
+		 */
+		jtag_add_reset(0, 1);
+	} else {
+		LOG_ERROR("%s: how to reset?", target_name(target));
+		return ERROR_FAIL;
+	}
+
 	/* registers are now invalid */
 	register_cache_invalidate(armv7a->armv4_5_common.core_cache);
 
@@ -1256,14 +1271,22 @@ static int cortex_a8_assert_reset(struct target *target)
 
 static int cortex_a8_deassert_reset(struct target *target)
 {
+	int retval;
 
 	LOG_DEBUG(" ");
 
-	if (target->reset_halt)
-	{
-		int retval;
-		if ((retval = target_halt(target)) != ERROR_OK)
-			return retval;
+	/* be certain SRST is off */
+	jtag_add_reset(0, 0);
+
+	retval = cortex_a8_poll(target);
+
+	if (target->reset_halt) {
+		if (target->state != TARGET_HALTED) {
+			LOG_WARNING("%s: ran after reset and before halt ...",
+					target_name(target));
+			if ((retval = target_halt(target)) != ERROR_OK)
+				return retval;
+		}
 	}
 
 	return ERROR_OK;