jtag: jtag_add_ir_scan() now takes a single field

In the code a single field was all that was ever used. Makes
jtag_add_ir_scan() simpler and leaves more complicated stuff
to jtag_add_plain_ir_scan().

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

src/jtag/core.c

@@ -42,7 +42,8 @@
 /// The number of JTAG queue flushes (for profiling and debugging purposes).
 static int jtag_flush_queue_count;
 
-static void jtag_add_scan_check(struct jtag_tap *active, void (*jtag_add_scan)(struct jtag_tap *active, int in_num_fields, const struct scan_field *in_fields, tap_state_t state),
+static void jtag_add_scan_check(struct jtag_tap *active,
+		void (*jtag_add_scan)(struct jtag_tap *active, int in_num_fields, const struct scan_field *in_fields, tap_state_t state),
 		int in_num_fields, struct scan_field *in_fields, tap_state_t state);
 
 /**
@@ -352,17 +353,22 @@ void jtag_alloc_in_value32(struct scan_field *field)
 	interface_jtag_alloc_in_value32(field);
 }
 
-void jtag_add_ir_scan_noverify(struct jtag_tap *active, int in_count, const struct scan_field *in_fields,
+void jtag_add_ir_scan_noverify(struct jtag_tap *active, const struct scan_field *in_fields,
 		tap_state_t state)
 {
 	jtag_prelude(state);
 
-	int retval = interface_jtag_add_ir_scan(active, in_count, in_fields, state);
+	int retval = interface_jtag_add_ir_scan(active, in_fields, state);
 	jtag_set_error(retval);
 }
 
+static void jtag_add_ir_scan_noverify_callback(struct jtag_tap *active, int dummy, const struct scan_field *in_fields,
+		tap_state_t state)
+{
+	jtag_add_ir_scan_noverify(active, in_fields, state);
+}
 
-void jtag_add_ir_scan(struct jtag_tap *active, int in_num_fields, struct scan_field *in_fields, tap_state_t state)
+void jtag_add_ir_scan(struct jtag_tap *active, struct scan_field *in_fields, tap_state_t state)
 {
 	assert(state != TAP_RESET);
 
@@ -370,18 +376,15 @@ void jtag_add_ir_scan(struct jtag_tap *active, int in_num_fields, struct scan_fi
 	{
 		/* 8 x 32 bit id's is enough for all invocations */
 
-		for (int j = 0; j < in_num_fields; j++)
-		{
-			/* if we are to run a verification of the ir scan, we need to get the input back.
-			 * We may have to allocate space if the caller didn't ask for the input back.
-			 */
-			in_fields[j].check_value = active->expected;
-			in_fields[j].check_mask = active->expected_mask;
-		}
-		jtag_add_scan_check(active, jtag_add_ir_scan_noverify, in_num_fields, in_fields, state);
+		/* if we are to run a verification of the ir scan, we need to get the input back.
+		 * We may have to allocate space if the caller didn't ask for the input back.
+		 */
+		in_fields->check_value = active->expected;
+		in_fields->check_mask = active->expected_mask;
+		jtag_add_scan_check(active, jtag_add_ir_scan_noverify_callback, 1, in_fields, state);
 	} else
 	{
-		jtag_add_ir_scan_noverify(active, in_num_fields, in_fields, state);
+		jtag_add_ir_scan_noverify(active, in_fields, state);
 	}
 }
 

src/jtag/drivers/driver.c

@@ -74,7 +74,7 @@ static void cmd_queue_scan_field_clone(struct scan_field * dst, const struct sca
  * see jtag_add_ir_scan()
  *
  */
-int interface_jtag_add_ir_scan(struct jtag_tap* active, int in_num_fields, const struct scan_field *in_fields, tap_state_t state)
+int interface_jtag_add_ir_scan(struct jtag_tap* active, const struct scan_field *in_fields, tap_state_t state)
 {
 	size_t num_taps = jtag_tap_count_enabled();
 
@@ -106,8 +106,7 @@ int interface_jtag_add_ir_scan(struct jtag_tap* active, int in_num_fields, const
 			/* if TAP is listed in input fields, copy the value */
 			tap->bypass = 0;
 
-			for (int j = 0; j < in_num_fields; j++)
-				cmd_queue_scan_field_clone(field, in_fields + j);
+			cmd_queue_scan_field_clone(field, in_fields);
 		} else
 		{
 			/* if a TAP isn't listed in input fields, set it to BYPASS */

src/jtag/jtag.h

@@ -350,13 +350,13 @@ int jtag_init_inner(struct command_context *cmd_ctx);
  * subsequent DR SCANs.
  *
  */
-void jtag_add_ir_scan(struct jtag_tap* tap, int num_fields,
+void jtag_add_ir_scan(struct jtag_tap* tap,
 		struct scan_field* fields, tap_state_t endstate);
 /**
  * The same as jtag_add_ir_scan except no verification is performed out
  * the output values.
  */
-void jtag_add_ir_scan_noverify(struct jtag_tap* tap, int num_fields,
+void jtag_add_ir_scan_noverify(struct jtag_tap* tap,
 		const struct scan_field *fields, tap_state_t state);
 /**
  * Duplicate the scan fields passed into the function into an IR SCAN

src/jtag/minidriver.h

@@ -50,7 +50,7 @@
 #include <jtag/minidriver_imp.h>
 
 int interface_jtag_add_ir_scan(struct jtag_tap* active,
-		int num_fields, const struct scan_field* fields,
+		const struct scan_field* fields,
 		tap_state_t endstate);
 int interface_jtag_add_plain_ir_scan(
 		int num_fields, const struct scan_field* fields,

src/jtag/minidummy/minidummy.c

@@ -46,7 +46,7 @@ int interface_jtag_execute_queue(void)
 	return ERROR_OK;
 }
 
-int interface_jtag_add_ir_scan(struct jtag_tap *active, int num_fields, const struct scan_field *fields, tap_state_t state)
+int interface_jtag_add_ir_scan(struct jtag_tap *active, const struct scan_field *fields, tap_state_t state)
 {
 	/* synchronously do the operation here */
 

src/jtag/tcl.c

@@ -1490,6 +1490,15 @@ COMMAND_HANDLER(handle_irscan_command)
 	}
 
 	int num_fields = CMD_ARGC / 2;
+	if (num_fields > 1)
+	{
+		/* we really should be looking at plain_ir_scan if we want
+		 * anything more fancy.
+		 */
+		LOG_ERROR("Specify a single value for tap");
+		return ERROR_COMMAND_SYNTAX_ERROR;
+	}
+
 	size_t fields_len = sizeof(struct scan_field) * num_fields;
 	fields = malloc(fields_len);
 	memset(fields, 0, fields_len);
@@ -1521,7 +1530,7 @@ COMMAND_HANDLER(handle_irscan_command)
 	}
 
 	/* did we have an endstate? */
-	jtag_add_ir_scan(tap, num_fields, fields, endstate);
+	jtag_add_ir_scan(tap, fields, endstate);
 
 	retval = jtag_execute_queue();
 

src/jtag/zy1000/zy1000.c

@@ -574,13 +574,11 @@ static __inline void scanFields(int num_fields, const struct scan_field *fields,
 	}
 }
 
-int interface_jtag_add_ir_scan(struct jtag_tap *active, int num_fields, const struct scan_field *fields, tap_state_t state)
+int interface_jtag_add_ir_scan(struct jtag_tap *active, const struct scan_field *fields, tap_state_t state)
 {
 	int scan_size = 0;
 	struct jtag_tap *tap, *nextTap;
 
-	assert(num_fields == 1);
-
 	for (tap = jtag_tap_next_enabled(NULL); tap!= NULL; tap = nextTap)
 	{
 		nextTap = jtag_tap_next_enabled(tap);
@@ -590,7 +588,7 @@ int interface_jtag_add_ir_scan(struct jtag_tap *active, int num_fields, const st
 		/* search the list */
 		if (tap == active)
 		{
-			scanFields(num_fields, fields, TAP_IRSHIFT, pause);
+			scanFields(1, fields, TAP_IRSHIFT, pause);
 			/* update device information */
 			buf_cpy(fields[0].out_value, tap->cur_instr, scan_size);