#ifdef _DEBUG_JTAG_IO_
-#define DEBUG_JTAG_IO(expr ...) LOG_DEBUG(expr)
+#define DEBUG_JTAG_IO(expr ...) \
+ do { if (1) LOG_DEBUG(expr); } while (0)
#else
-#define DEBUG_JTAG_IO(expr ...)
+#define DEBUG_JTAG_IO(expr ...) \
+ do { if (0) LOG_DEBUG(expr); } while (0)
#endif
#ifndef DEBUG_JTAG_IOZ
* Function tap_state_name
* Returns a string suitable for display representing the JTAG tap_state
*/
-const char* tap_state_name(tap_state_t state);
+const char *tap_state_name(tap_state_t state);
+
+/// Provides user-friendly name lookup of TAP states.
+tap_state_t tap_state_by_name(const char *name);
/// The current TAP state of the pending JTAG command queue.
extern tap_state_t cmd_queue_cur_state;
/*
- * 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:
+ *
+ * + 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
+ *
+ * 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.
*
- * - TMS reset
- * - SRST pulls TRST
- * - TRST asserted
+ * - 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 activation/deactivation is currently implemented outside the core
- * using scripted code that understands the specific router type.
+ * - 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
RESET_TRST_PULLS_SRST = 0x8,
RESET_TRST_OPEN_DRAIN = 0x10,
RESET_SRST_PUSH_PULL = 0x20,
+ RESET_SRST_NO_GATING = 0x40,
};
enum reset_types jtag_get_reset_config(void);
void jtag_set_ntrst_delay(unsigned delay);
unsigned jtag_get_ntrst_delay(void);
+void jtag_set_nsrst_assert_width(unsigned delay);
+unsigned jtag_get_nsrst_assert_width(void);
+
+void jtag_set_ntrst_assert_width(unsigned delay);
+unsigned jtag_get_ntrst_assert_width(void);
+
/// @returns The current state of TRST.
int jtag_get_trst(void);
/// @returns The current state of SRST.
extern int jtag_init(struct command_context_s* cmd_ctx);
/// reset, then initialize JTAG chain
-extern int jtag_init_reset(struct command_context_s* cmd_ctx);
-extern int jtag_register_commands(struct command_context_s* cmd_ctx);
+extern int jtag_init_reset(struct command_context_s* cmd_ctx);
+extern int jtag_register_commands(struct command_context_s* cmd_ctx);
+extern int jtag_init_inner(struct command_context_s *cmd_ctx);
/**
* @file
* @return ERROR_OK on success, or an error code on failure.
*
* Moves from the current state to the goal \a state.
- *
- * This needs to be handled according to the xsvf spec, see the XSTATE
- * command description. From the XSVF spec, pertaining to XSTATE:
- *
- * For special states known as stable states (Test-Logic-Reset,
- * Run-Test/Idle, Pause-DR, Pause- IR), an XSVF interpreter follows
- * predefined TAP state paths when the starting state is a stable state
- * and when the XSTATE specifies a new stable state. See the STATE
- * command in the [Ref 5] for the TAP state paths between stable
- * states.
- *
- * For non-stable states, XSTATE should specify a state that is only one
- * TAP state transition distance from the current TAP state to avoid
- * undefined TAP state paths. A sequence of multiple XSTATE commands can
- * be issued to transition the TAP through a specific state path.
- *
- * @note Unless @c tms_bits holds a path that agrees with [Ref 5] in the
- * above spec, then this code is not fully conformant to the xsvf spec.
- * This puts a burden on tap_get_tms_path() function from the xsvf spec.
- * If in doubt, you should confirm that that burden is being met.
- *
- * Otherwise, @a goal_state must be immediately reachable in one clock
- * cycle, and does not need to be a stable state.
+ * Both states must be stable.
*/
extern int jtag_add_statemove(tap_state_t goal_state);
/// @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 */
#define ERROR_JTAG_DEVICE_ERROR (-107)
#define ERROR_JTAG_STATE_INVALID (-108)
#define ERROR_JTAG_TRANSITION_INVALID (-109)
+#define ERROR_JTAG_INIT_SOFT_FAIL (-110)
/**
* jtag_add_dr_out() is a version of jtag_add_dr_scan() which
*/
int jtag_error_clear(void);
+/**
+ * Return true if it's safe for a background polling task to access the
+ * JTAG scan chain. Polling may be explicitly disallowed, and is also
+ * unsafe while nTRST is active or the JTAG clock is gated off.,
+ */
+bool is_jtag_poll_safe(void);
+
+/**
+ * Return flag reporting whether JTAG polling is disallowed.
+ */
+bool jtag_poll_get_enabled(void);
+
+/**
+ * Assign flag reporting whether JTAG polling is disallowed.
+ */
+void jtag_poll_set_enabled(bool value);
+
#endif /* JTAG_H */
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