Encapsulate the core jtag interface pointer:

- Add new jtag_config_khz to increase encapsulation of jtag->khz call.
- Add new jtag_get_speed_readable to encapsulate of jtag->speed_div call.
- Make definition of jtag static in core.c, remove extern from tcl.c.


git-svn-id: svn://svn.berlios.de/openocd/trunk@2171 b42882b7-edfa-0310-969c-e2dbd0fdcd60

src/jtag/core.c

@@ -103,7 +103,7 @@ static int speed_khz = 0;
 static bool hasKHz = false;
 static int jtag_speed = 0;
 
-struct jtag_interface_s *jtag = NULL;
+static struct jtag_interface_s *jtag = NULL;
 
 /* configuration */
 jtag_interface_t *jtag_interface = NULL;
@@ -1178,6 +1178,27 @@ unsigned jtag_get_speed_khz(void)
 {
 	return speed_khz;
 }
+int jtag_config_khz(unsigned khz)
+{
+	LOG_DEBUG("handle jtag khz");
+	jtag_set_speed_khz(khz);
+
+	int cur_speed = 0;
+	if (jtag != NULL)
+	{
+		LOG_DEBUG("have interface set up");
+		int speed_div1;
+		int retval = jtag->khz(jtag_get_speed_khz(), &speed_div1);
+		if (ERROR_OK != retval)
+		{
+			jtag_set_speed_khz(0);
+			return retval;
+		}
+		cur_speed = speed_div1;
+	}
+	return jtag_set_speed(cur_speed);
+}
+
 int jtag_get_speed(void)
 {
 	return jtag_speed;
@@ -1192,6 +1213,12 @@ int jtag_set_speed(int speed)
 	return jtag ? jtag->speed(speed) : ERROR_OK;
 }
 
+int jtag_get_speed_readable(int *speed)
+{
+	return jtag ? jtag->speed_div(jtag_get_speed(), speed) : ERROR_OK;
+}
+
+
 void jtag_set_verify(bool enable)
 {
 	jtag_verify = enable;

src/jtag/jtag.h

@@ -269,6 +269,14 @@ extern int jtag_call_event_callbacks(enum jtag_event event);
 
 /// @returns The current JTAG speed setting.
 int jtag_get_speed(void);
+/**
+ * Given a @a speed setting, use the interface @c speed_div callback to
+ * adjust the setting.  
+ * @param speed The speed setting to convert back to readable KHz.
+ * @returns ERROR_OK if the interface has not been initialized or on success;
+ * 	otherwise, the error code produced by the @c speed_div callback.
+ */
+int jtag_get_speed_readable(int *speed);
 /**
  * Set the JTAG speed. This routine will call the underlying
  * interface @c speed callback, if the interface has been initialized.
@@ -708,6 +716,7 @@ unsigned jtag_get_nsrst_delay(void);
 void jtag_set_ntrst_delay(unsigned delay);
 unsigned jtag_get_ntrst_delay(void);
 
+int jtag_config_khz(unsigned khz);
 void jtag_set_speed_khz(unsigned speed);
 unsigned jtag_get_speed_khz(void);
 

src/jtag/tcl.c

@@ -170,7 +170,6 @@ jtag_interface_t *jtag_interfaces[] = {
 	NULL,
 };
 
-extern struct jtag_interface_s *jtag;
 extern jtag_interface_t *jtag_interface;
 
 /* jtag commands */
@@ -1012,41 +1011,24 @@ static int handle_jtag_khz_command(struct command_context_s *cmd_ctx, char *cmd,
 		return ERROR_COMMAND_SYNTAX_ERROR;
 
 	int retval = ERROR_OK;
-	int cur_speed = 0;
 	if (argc == 1)
 	{
-		LOG_DEBUG("handle jtag khz");
-
-		jtag_set_speed_khz(strtoul(args[0], NULL, 0));
-		if (jtag != NULL)
-		{
-			LOG_DEBUG("have interface set up");
-			int speed_div1;
-			retval = jtag->khz(jtag_get_speed_khz(), &speed_div1);
-			if (ERROR_OK != retval)
-			{
-				jtag_set_speed_khz(0);
-				return retval;
-			}
-			cur_speed = speed_div1;
-		}
-		retval = jtag_set_speed(cur_speed);
-	}
-
-	cur_speed = jtag_get_speed_khz();
-	if (jtag != NULL)
-	{
-		retval = jtag->speed_div(jtag_get_speed(), &cur_speed);
+		retval = jtag_config_khz(strtoul(args[0], NULL, 0));
 		if (ERROR_OK != retval)
 			return retval;
 	}
 
+	int cur_speed;
+	retval = jtag_get_speed_readable(&cur_speed);
+	if (ERROR_OK != retval)
+		return retval;
+
 	if (cur_speed)
 		command_print(cmd_ctx, "%d kHz", cur_speed);
 	else
 		command_print(cmd_ctx, "RCLK - adaptive");
-	return retval;
 
+	return retval;
 }
 
 static int handle_jtag_reset_command(struct command_context_s *cmd_ctx,