nds32: Add jtag scan_chain command

Create new command to refresh idcode list during runtime
and update Tap idcode.

Change-Id: Ie889a39a6f57cea207b2b9c9e42c51c97cfe4d8e
Signed-off-by: Hellosun Wu <wujiheng.tw@gmail.com>
Reviewed-on: http://openocd.zylin.com/4133
Tested-by: jenkins
Reviewed-by: Hsiangkai Wang <hsiangkai@gmail.com>
Reviewed-by: penny chen <penny6610231@gmail.com>
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>

src/jtag/aice/aice_interface.c

@@ -239,6 +239,30 @@ static int aice_khz(int khz, int *jtag_speed)
 	return ERROR_OK;
 }
 
+int aice_scan_jtag_chain(void)
+{
+	LOG_DEBUG("=== %s ===", __func__);
+	uint8_t num_of_idcode = 0;
+	struct target *target;
+
+	int res = aice_port->api->idcode(aice_target_id_codes, &num_of_idcode);
+	if (res != ERROR_OK) {
+		LOG_ERROR("<-- TARGET ERROR! Failed to identify AndesCore "
+					"JTAG Manufacture ID in the JTAG scan chain. "
+					"Failed to access EDM registers. -->");
+		return res;
+	}
+
+	for (uint32_t i = 0; i < num_of_idcode; i++)
+		LOG_DEBUG("id_codes[%d] = 0x%x", i, aice_target_id_codes[i]);
+
+	/* Update tap idcode */
+	for (target = all_targets; target; target = target->next)
+		target->tap->idcode = aice_target_id_codes[target->tap->abs_chain_position];
+
+	return ERROR_OK;
+}
+
 /***************************************************************************/
 /* Command handlers */
 COMMAND_HANDLER(aice_handle_aice_info_command)

src/jtag/aice/aice_interface.h

@@ -31,5 +31,6 @@ struct aice_interface_param_s {
 };
 
 int aice_init_targets(void);
+int aice_scan_jtag_chain(void);
 
 #endif /* OPENOCD_JTAG_AICE_AICE_INTERFACE_H */

src/jtag/aice/aice_transport.c

@@ -158,6 +158,59 @@ COMMAND_HANDLER(handle_aice_init_command)
 	return jtag_init(CMD_CTX);
 }
 
+COMMAND_HANDLER(handle_scan_chain_command)
+{
+	struct jtag_tap *tap;
+	char expected_id[12];
+
+	aice_scan_jtag_chain();
+	tap = jtag_all_taps();
+	command_print(CMD_CTX,
+		"   TapName             Enabled  IdCode     Expected   IrLen IrCap IrMask");
+	command_print(CMD_CTX,
+		"-- ------------------- -------- ---------- ---------- ----- ----- ------");
+
+	while (tap) {
+		uint32_t expected, expected_mask, ii;
+
+		snprintf(expected_id, sizeof expected_id, "0x%08x",
+			(unsigned)((tap->expected_ids_cnt > 0)
+				   ? tap->expected_ids[0]
+				   : 0));
+		if (tap->ignore_version)
+			expected_id[2] = '*';
+
+		expected = buf_get_u32(tap->expected, 0, tap->ir_length);
+		expected_mask = buf_get_u32(tap->expected_mask, 0, tap->ir_length);
+
+		command_print(CMD_CTX,
+			"%2d %-18s     %c     0x%08x %s %5d 0x%02x  0x%02x",
+			tap->abs_chain_position,
+			tap->dotted_name,
+			tap->enabled ? 'Y' : 'n',
+			(unsigned int)(tap->idcode),
+			expected_id,
+			(unsigned int)(tap->ir_length),
+			(unsigned int)(expected),
+			(unsigned int)(expected_mask));
+
+		for (ii = 1; ii < tap->expected_ids_cnt; ii++) {
+			snprintf(expected_id, sizeof expected_id, "0x%08x",
+				(unsigned) tap->expected_ids[ii]);
+			if (tap->ignore_version)
+				expected_id[2] = '*';
+
+			command_print(CMD_CTX,
+				"                                           %s",
+				expected_id);
+		}
+
+		tap = tap->next_tap;
+	}
+
+	return ERROR_OK;
+}
+
 static int jim_aice_arp_init(Jim_Interp *interp, int argc, Jim_Obj * const *argv)
 {
 	LOG_DEBUG("No implement: jim_aice_arp_init");
@@ -307,6 +360,13 @@ aice_transport_jtag_subcommand_handlers[] = {
 		.jim_handler = jim_aice_names,
 		.help = "Returns list of all JTAG tap names.",
 	},
+	{
+		.name = "scan_chain",
+		.handler = handle_scan_chain_command,
+		.mode = COMMAND_ANY,
+		.help = "print current scan chain configuration",
+		.usage = ""
+	},
 
 	COMMAND_REGISTRATION_DONE
 };