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-rw-r--r--src/jtag/jtag.h33
1 files changed, 21 insertions, 12 deletions
diff --git a/src/jtag/jtag.h b/src/jtag/jtag.h
index 938d854b..f255a70e 100644
--- a/src/jtag/jtag.h
+++ b/src/jtag/jtag.h
@@ -192,23 +192,32 @@ extern unsigned jtag_tap_count(void);
/*
- * There are three cases when JTAG_TRST_ASSERTED callback is invoked. The
- * event is invoked *after* TRST is asserted(or queued rather). It is illegal
- * to communicate with the JTAG interface during the callback(as there is
- * currently a queue being built).
+ * - TRST_ASSERTED triggers two sets of callbacks, after operations to
+ * reset the scan chain -- via TMS+TCK signaling, or deasserting the
+ * nTRST signal -- are queued:
*
- * - TMS reset
- * - SRST pulls TRST
- * - TRST asserted
+ * + Callbacks in C code fire first, patching internal state
+ * + Then post-reset event scripts fire ... activating JTAG circuits
+ * via TCK cycles, exiting SWD mode via TMS sequences, etc
*
- * TAP activation/deactivation is currently implemented outside the core
- * using scripted code that understands the specific router type.
+ * During those callbacks, scan chain contents have not been validated.
+ * JTAG operations that address a specific TAP (primarily DR/IR scans)
+ * must *not* be queued.
+ *
+ * - TAP_EVENT_SETUP is reported after TRST_ASSERTED, and after the scan
+ * chain has been validated. JTAG operations including scans that
+ * target specific TAPs may be performed.
+ *
+ * - TAP_EVENT_ENABLE and TAP_EVENT_DISABLE implement TAP activation and
+ * deactivation outside the core using scripted code that understands
+ * the specific JTAG router type. They might be triggered indirectly
+ * from EVENT_SETUP operations.
*/
enum jtag_event {
JTAG_TRST_ASSERTED,
+ JTAG_TAP_EVENT_SETUP,
JTAG_TAP_EVENT_ENABLE,
JTAG_TAP_EVENT_DISABLE,
- JTAG_TAP_EVENT_POST_RESET,
};
struct jtag_tap_event_action_s
@@ -643,8 +652,8 @@ extern void jtag_execute_queue_noclear(void);
/// @returns the number of times the scan queue has been flushed
int jtag_get_flush_queue_count(void);
-/// Notify all TAP's about a TLR reset
-void jtag_notify_reset(void);
+/// Report Tcl event to all TAPs
+void jtag_notify_event(enum jtag_event);
/* can be implemented by hw + sw */