adapter: switch from struct jtag_interface to adapter_driver

To reorganize the adapters code, introduce an adapter_driver
struct that contains all the adapter generic part, while
keeping in two separate struct the specific API jtag_ops and
swd_ops.
Move the allocation of *adapter_driver from the JTAG-specific
file core.c to the more adapter-specific file adapter.c
While splitting the old jtag_interface for every driver, put
the fields in the same order as in the struct declaration so
we keep a consistent code across all the drivers.

While other transport specific API could/would be added as
separate ops, nothing is done here for HLA.

Change-Id: I2d60f97ac514c0dd2d93a6ec9be66fd9d388dad5
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/4900
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>

39 files changed, 432 insertions, 259 deletions

diff --git a/src/jtag/adapter.c b/src/jtag/adapter.c
index d23f79e..e2782a7 100644
--- a/src/jtag/adapter.c
+++ b/src/jtag/adapter.c
@@ -46,7 +46,7 @@
  * Holds support for configuring debug adapters from TCl scripts.
  */
 
-extern struct jtag_interface *jtag_interface;
+struct adapter_driver *adapter_driver;
 const char * const jtag_only[] = { "jtag", NULL };
 
 static int jim_adapter_name(Jim_Interp *interp, int argc, Jim_Obj * const *argv)
@@ -61,7 +61,7 @@ static int jim_adapter_name(Jim_Interp *interp, int argc, Jim_Obj * const *argv)
 		Jim_WrongNumArgs(goi.interp, 1, goi.argv-1, "(no params)");
 		return JIM_ERR;
 	}
-	const char *name = jtag_interface ? jtag_interface->name : NULL;
+	const char *name = adapter_driver ? adapter_driver->name : NULL;
 	Jim_SetResultString(goi.interp, name ? : "undefined", -1);
 	return JIM_OK;
 }
@@ -91,8 +91,8 @@ COMMAND_HANDLER(handle_interface_list_command)
 		return ERROR_COMMAND_SYNTAX_ERROR;
 
 	command_print(CMD, "The following debug interfaces are available:");
-	for (unsigned i = 0; NULL != jtag_interfaces[i]; i++) {
-		const char *name = jtag_interfaces[i]->name;
+	for (unsigned i = 0; NULL != adapter_drivers[i]; i++) {
+		const char *name = adapter_drivers[i]->name;
 		command_print(CMD, "%u: %s", i + 1, name);
 	}
 
@@ -104,7 +104,7 @@ COMMAND_HANDLER(handle_interface_command)
 	int retval;
 
 	/* check whether the interface is already configured */
-	if (jtag_interface) {
+	if (adapter_driver) {
 		LOG_WARNING("Interface already configured, ignoring");
 		return ERROR_OK;
 	}
@@ -113,20 +113,20 @@ COMMAND_HANDLER(handle_interface_command)
 	if (CMD_ARGC != 1 || CMD_ARGV[0][0] == '\0')
 		return ERROR_COMMAND_SYNTAX_ERROR;
 
-	for (unsigned i = 0; NULL != jtag_interfaces[i]; i++) {
-		if (strcmp(CMD_ARGV[0], jtag_interfaces[i]->name) != 0)
+	for (unsigned i = 0; NULL != adapter_drivers[i]; i++) {
+		if (strcmp(CMD_ARGV[0], adapter_drivers[i]->name) != 0)
 			continue;
 
-		if (NULL != jtag_interfaces[i]->commands) {
+		if (NULL != adapter_drivers[i]->commands) {
 			retval = register_commands(CMD_CTX, NULL,
-					jtag_interfaces[i]->commands);
+					adapter_drivers[i]->commands);
 			if (ERROR_OK != retval)
 				return retval;
 		}
 
-		jtag_interface = jtag_interfaces[i];
+		adapter_driver = adapter_drivers[i];
 
-		return allow_transports(CMD_CTX, jtag_interface->transports);
+		return allow_transports(CMD_CTX, adapter_driver->transports);
 	}
 
 	/* no valid interface was found (i.e. the configuration option,
diff --git a/src/jtag/aice/aice_interface.c b/src/jtag/aice/aice_interface.c
index c83b8c2..f9bd87e 100644
--- a/src/jtag/aice/aice_interface.c
+++ b/src/jtag/aice/aice_interface.c
@@ -518,14 +518,20 @@ static const struct command_registration aice_command_handlers[] = {
 /***************************************************************************/
 /* End of Command handlers */
 
-struct jtag_interface aice_interface = {
+static struct jtag_interface aice_interface = {
+	.execute_queue = aice_execute_queue,
+};
+
+struct adapter_driver aice_adapter_driver = {
 	.name = "aice",
-	.commands = aice_command_handlers,
 	.transports = aice_transports,
+	.commands = aice_command_handlers,
+
 	.init = aice_init,
 	.quit = aice_quit,
-	.execute_queue = aice_execute_queue,
 	.speed = aice_speed,		/* set interface speed */
-	.speed_div = aice_speed_div,	/* return readable value */
 	.khz = aice_khz,		/* convert khz to interface speed value */
+	.speed_div = aice_speed_div,	/* return readable value */
+
+	.jtag_ops = &aice_interface,
 };
diff --git a/src/jtag/core.c b/src/jtag/core.c
index 5e9777e..6239573 100644
--- a/src/jtag/core.c
+++ b/src/jtag/core.c
@@ -126,10 +126,10 @@ static int rclk_fallback_speed_khz;
 static enum {CLOCK_MODE_UNSELECTED, CLOCK_MODE_KHZ, CLOCK_MODE_RCLK} clock_mode;
 static int jtag_speed;
 
-static struct jtag_interface *jtag;
+/* FIXME: change name to this variable, it is not anymore JTAG only */
+static struct adapter_driver *jtag;
 
-/* configuration */
-struct jtag_interface *jtag_interface;
+extern struct adapter_driver *adapter_driver;
 
 void jtag_set_flush_queue_sleep(int ms)
 {
@@ -503,7 +503,7 @@ int jtag_add_tms_seq(unsigned nbits, const uint8_t *seq, enum tap_state state)
 {
 	int retval;
 
-	if (!(jtag->supported & DEBUG_CAP_TMS_SEQ))
+	if (!(jtag->jtag_ops->supported & DEBUG_CAP_TMS_SEQ))
 		return ERROR_JTAG_NOT_IMPLEMENTED;
 
 	jtag_checks();
@@ -946,11 +946,11 @@ int default_interface_jtag_execute_queue(void)
 		 * The fix can be applied immediately after next release (v0.11.0 ?)
 		 */
 		LOG_ERROR("JTAG API jtag_execute_queue() called on non JTAG interface");
-		if (!jtag->execute_queue)
+		if (!jtag->jtag_ops || !jtag->jtag_ops->execute_queue)
 			return ERROR_OK;
 	}
 
-	int result = jtag->execute_queue();
+	int result = jtag->jtag_ops->execute_queue();
 
 #if !BUILD_ZY1000
 	/* Only build this if we use a regular driver with a command queue.
@@ -1518,7 +1518,7 @@ int adapter_init(struct command_context *cmd_ctx)
 	if (jtag)
 		return ERROR_OK;
 
-	if (!jtag_interface) {
+	if (!adapter_driver) {
 		/* nothing was previously specified by "interface" command */
 		LOG_ERROR("Debug Adapter has to be specified, "
 			"see \"interface\" command");
@@ -1526,10 +1526,10 @@ int adapter_init(struct command_context *cmd_ctx)
 	}
 
 	int retval;
-	retval = jtag_interface->init();
+	retval = adapter_driver->init();
 	if (retval != ERROR_OK)
 		return retval;
-	jtag = jtag_interface;
+	jtag = adapter_driver;
 
 	if (jtag->speed == NULL) {
 		LOG_INFO("This adapter doesn't support configurable speed");
diff --git a/src/jtag/drivers/amt_jtagaccel.c b/src/jtag/drivers/amt_jtagaccel.c
index 045672f..db106bb 100644
--- a/src/jtag/drivers/amt_jtagaccel.c
+++ b/src/jtag/drivers/amt_jtagaccel.c
@@ -584,7 +584,11 @@ static const struct command_registration amtjtagaccel_command_handlers[] = {
 	COMMAND_REGISTRATION_DONE
 };
 
-struct jtag_interface amt_jtagaccel_interface = {
+static struct jtag_interface amt_jtagaccel_interface = {
+	.execute_queue = amt_jtagaccel_execute_queue,
+};
+
+struct adapter_driver amt_jtagaccel_adapter_driver = {
 	.name = "amt_jtagaccel",
 	.transports = jtag_only,
 	.commands = amtjtagaccel_command_handlers,
@@ -592,5 +596,6 @@ struct jtag_interface amt_jtagaccel_interface = {
 	.init = amt_jtagaccel_init,
 	.quit = amt_jtagaccel_quit,
 	.speed = amt_jtagaccel_speed,
-	.execute_queue = amt_jtagaccel_execute_queue,
+
+	.jtag_ops = &amt_jtagaccel_interface,
 };
diff --git a/src/jtag/drivers/arm-jtag-ew.c b/src/jtag/drivers/arm-jtag-ew.c
index 285bf9b..c81f804 100644
--- a/src/jtag/drivers/arm-jtag-ew.c
+++ b/src/jtag/drivers/arm-jtag-ew.c
@@ -495,16 +495,22 @@ static const struct command_registration armjtagew_command_handlers[] = {
 	COMMAND_REGISTRATION_DONE
 };
 
-struct jtag_interface armjtagew_interface = {
+static struct jtag_interface armjtagew_interface = {
+	.execute_queue = armjtagew_execute_queue,
+};
+
+struct adapter_driver armjtagew_adapter_driver = {
 	.name = "arm-jtag-ew",
-	.commands = armjtagew_command_handlers,
 	.transports = jtag_only,
-	.execute_queue = armjtagew_execute_queue,
-	.speed = armjtagew_speed,
-	.speed_div = armjtagew_speed_div,
-	.khz = armjtagew_khz,
+	.commands = armjtagew_command_handlers,
+
 	.init = armjtagew_init,
 	.quit = armjtagew_quit,
+	.speed = armjtagew_speed,
+	.khz = armjtagew_khz,
+	.speed_div = armjtagew_speed_div,
+
+	.jtag_ops = &armjtagew_interface,
 };
 
 /**************************************************************************
diff --git a/src/jtag/drivers/at91rm9200.c b/src/jtag/drivers/at91rm9200.c
index e2f64f5..1026847 100644
--- a/src/jtag/drivers/at91rm9200.c
+++ b/src/jtag/drivers/at91rm9200.c
@@ -187,14 +187,20 @@ static const struct command_registration at91rm9200_command_handlers[] = {
 	COMMAND_REGISTRATION_DONE
 };
 
-struct jtag_interface at91rm9200_interface = {
-	.name = "at91rm9200",
+static struct jtag_interface at91rm9200_interface = {
 	.execute_queue = bitbang_execute_queue,
+};
+
+struct adapter_driver at91rm9200_adapter_driver = {
+	.name = "at91rm9200",
 	.transports = jtag_only,
 	.commands = at91rm9200_command_handlers,
+
 	.init = at91rm9200_init,
 	.quit = at91rm9200_quit,
 	.reset = at91rm9200_reset,
+
+	.jtag_ops = &at91rm9200_interface,
 };
 
 static int at91rm9200_init(void)
diff --git a/src/jtag/drivers/bcm2835gpio.c b/src/jtag/drivers/bcm2835gpio.c
index 60316f1..bbc87d3 100644
--- a/src/jtag/drivers/bcm2835gpio.c
+++ b/src/jtag/drivers/bcm2835gpio.c
@@ -405,19 +405,25 @@ static const struct command_registration bcm2835gpio_command_handlers[] = {
 
 static const char * const bcm2835_transports[] = { "jtag", "swd", NULL };
 
-struct jtag_interface bcm2835gpio_interface = {
-	.name = "bcm2835gpio",
+static struct jtag_interface bcm2835gpio_interface = {
 	.supported = DEBUG_CAP_TMS_SEQ,
 	.execute_queue = bitbang_execute_queue,
+};
+
+struct adapter_driver bcm2835gpio_adapter_driver = {
+	.name = "bcm2835gpio",
 	.transports = bcm2835_transports,
-	.swd = &bitbang_swd,
-	.speed = bcm2835gpio_speed,
-	.khz = bcm2835gpio_khz,
-	.speed_div = bcm2835gpio_speed_div,
 	.commands = bcm2835gpio_command_handlers,
+
 	.init = bcm2835gpio_init,
 	.quit = bcm2835gpio_quit,
 	.reset = bcm2835gpio_reset,
+	.speed = bcm2835gpio_speed,
+	.khz = bcm2835gpio_khz,
+	.speed_div = bcm2835gpio_speed_div,
+
+	.jtag_ops = &bcm2835gpio_interface,
+	.swd_ops = &bitbang_swd,
 };
 
 static bool bcm2835gpio_jtag_mode_possible(void)
diff --git a/src/jtag/drivers/buspirate.c b/src/jtag/drivers/buspirate.c
index 23d1547..020c4ce 100644
--- a/src/jtag/drivers/buspirate.c
+++ b/src/jtag/drivers/buspirate.c
@@ -536,15 +536,21 @@ static const struct swd_driver buspirate_swd = {
 
 static const char * const buspirate_transports[] = { "jtag", "swd", NULL };
 
-struct jtag_interface buspirate_interface = {
-	.name = "buspirate",
+static struct jtag_interface buspirate_interface = {
 	.execute_queue = buspirate_execute_queue,
-	.commands = buspirate_command_handlers,
+};
+
+struct adapter_driver buspirate_adapter_driver = {
+	.name = "buspirate",
 	.transports = buspirate_transports,
-	.swd = &buspirate_swd,
+	.commands = buspirate_command_handlers,
+
 	.init = buspirate_init,
 	.quit = buspirate_quit,
 	.reset = buspirate_reset,
+
+	.jtag_ops = &buspirate_interface,
+	.swd_ops = &buspirate_swd,
 };
 
 /*************** jtag execute commands **********************/
diff --git a/src/jtag/drivers/cmsis_dap_usb.c b/src/jtag/drivers/cmsis_dap_usb.c
index c54b70c..c072821 100644
--- a/src/jtag/drivers/cmsis_dap_usb.c
+++ b/src/jtag/drivers/cmsis_dap_usb.c
@@ -1786,18 +1786,23 @@ static const struct swd_driver cmsis_dap_swd_driver = {
 
 static const char * const cmsis_dap_transport[] = { "swd", "jtag", NULL };
 
-struct jtag_interface cmsis_dap_interface = {
-	.name = "cmsis-dap",
+static struct jtag_interface cmsis_dap_interface = {
 	.supported = DEBUG_CAP_TMS_SEQ,
-	.commands = cmsis_dap_command_handlers,
-	.swd = &cmsis_dap_swd_driver,
+	.execute_queue = cmsis_dap_execute_queue,
+};
+
+struct adapter_driver cmsis_dap_adapter_driver = {
+	.name = "cmsis-dap",
 	.transports = cmsis_dap_transport,
+	.commands = cmsis_dap_command_handlers,
 
-	.execute_queue = cmsis_dap_execute_queue,
-	.speed = cmsis_dap_speed,
-	.speed_div = cmsis_dap_speed_div,
-	.khz = cmsis_dap_khz,
 	.init = cmsis_dap_init,
 	.quit = cmsis_dap_quit,
 	.reset = cmsis_dap_reset,
+	.speed = cmsis_dap_speed,
+	.khz = cmsis_dap_khz,
+	.speed_div = cmsis_dap_speed_div,
+
+	.jtag_ops = &cmsis_dap_interface,
+	.swd_ops = &cmsis_dap_swd_driver,
 };
diff --git a/src/jtag/drivers/dummy.c b/src/jtag/drivers/dummy.c
index 739213e..e66cb6b 100644
--- a/src/jtag/drivers/dummy.c
+++ b/src/jtag/drivers/dummy.c
@@ -144,20 +144,22 @@ static const struct command_registration dummy_command_handlers[] = {
 /* The dummy driver is used to easily check the code path
  * where the target is unresponsive.
  */
-struct jtag_interface dummy_interface = {
-		.name = "dummy",
-
-		.supported = DEBUG_CAP_TMS_SEQ,
-		.commands = dummy_command_handlers,
-		.transports = jtag_only,
+static struct jtag_interface dummy_interface = {
+	.supported = DEBUG_CAP_TMS_SEQ,
+	.execute_queue = &bitbang_execute_queue,
+};
 
-		.execute_queue = &bitbang_execute_queue,
+struct adapter_driver dummy_adapter_driver = {
+	.name = "dummy",
+	.transports = jtag_only,
+	.commands = dummy_command_handlers,
 
-		.speed = &dummy_speed,
-		.khz = &dummy_khz,
-		.speed_div = &dummy_speed_div,
+	.init = &dummy_init,
+	.quit = &dummy_quit,
+	.reset = &dummy_reset,
+	.speed = &dummy_speed,
+	.khz = &dummy_khz,
+	.speed_div = &dummy_speed_div,
 
-		.init = &dummy_init,
-		.quit = &dummy_quit,
-		.reset = &dummy_reset,
-	};
+	.jtag_ops = &dummy_interface,
+};
diff --git a/src/jtag/drivers/ep93xx.c b/src/jtag/drivers/ep93xx.c
index dbbfc7a..5e0e62a 100644
--- a/src/jtag/drivers/ep93xx.c
+++ b/src/jtag/drivers/ep93xx.c
@@ -50,16 +50,20 @@ static int ep93xx_quit(void);
 
 struct timespec ep93xx_zzzz;
 
-struct jtag_interface ep93xx_interface = {
-	.name = "ep93xx",
-
+static struct jtag_interface ep93xx_interface = {
 	.supported = DEBUG_CAP_TMS_SEQ,
 	.execute_queue = bitbang_execute_queue,
+};
+
+struct adapter_driver ep93xx_adapter_driver = {
+	.name = "ep93xx",
 	.transports = jtag_only,
 
 	.init = ep93xx_init,
 	.quit = ep93xx_quit,
 	.reset = ep93xx_reset,
+
+	.jtag_ops = &ep93xx_interface,
 };
 
 static struct bitbang_interface ep93xx_bitbang = {
diff --git a/src/jtag/drivers/ft232r.c b/src/jtag/drivers/ft232r.c
index 8cda76e..1ef0c57 100644
--- a/src/jtag/drivers/ft232r.c
+++ b/src/jtag/drivers/ft232r.c
@@ -914,17 +914,21 @@ static int syncbb_execute_queue(void)
 	return retval;
 }
 
-struct jtag_interface ft232r_interface = {
-	.name = "ft232r",
-	.commands = ft232r_command_handlers,
-	.transports = jtag_only,
+static struct jtag_interface ft232r_interface = {
 	.supported = DEBUG_CAP_TMS_SEQ,
-
 	.execute_queue = syncbb_execute_queue,
+};
+
+struct adapter_driver ft232r_adapter_driver = {
+	.name = "ft232r",
+	.transports = jtag_only,
+	.commands = ft232r_command_handlers,
 
-	.speed = ft232r_speed,
 	.init = ft232r_init,
 	.quit = ft232r_quit,
-	.speed_div = ft232r_speed_div,
+	.speed = ft232r_speed,
 	.khz = ft232r_khz,
+	.speed_div = ft232r_speed_div,
+
+	.jtag_ops = &ft232r_interface,
 };
diff --git a/src/jtag/drivers/ftdi.c b/src/jtag/drivers/ftdi.c
index e645e9f..40d076e 100644
--- a/src/jtag/drivers/ftdi.c
+++ b/src/jtag/drivers/ftdi.c
@@ -1231,18 +1231,23 @@ static const struct swd_driver ftdi_swd = {
 
 static const char * const ftdi_transports[] = { "jtag", "swd", NULL };
 
-struct jtag_interface ftdi_interface = {
-	.name = "ftdi",
+static struct jtag_interface ftdi_interface = {
 	.supported = DEBUG_CAP_TMS_SEQ,
-	.commands = ftdi_command_handlers,
+	.execute_queue = ftdi_execute_queue,
+};
+
+struct adapter_driver ftdi_adapter_driver = {
+	.name = "ftdi",
 	.transports = ftdi_transports,
-	.swd = &ftdi_swd,
+	.commands = ftdi_command_handlers,
 
 	.init = ftdi_initialize,
 	.quit = ftdi_quit,
 	.reset = ftdi_reset,
 	.speed = ftdi_speed,
-	.speed_div = ftdi_speed_div,
 	.khz = ftdi_khz,
-	.execute_queue = ftdi_execute_queue,
+	.speed_div = ftdi_speed_div,
+
+	.jtag_ops = &ftdi_interface,
+	.swd_ops = &ftdi_swd,
 };
diff --git a/src/jtag/drivers/gw16012.c b/src/jtag/drivers/gw16012.c
index 6969e8b..2e8dad8 100644
--- a/src/jtag/drivers/gw16012.c
+++ b/src/jtag/drivers/gw16012.c
@@ -521,12 +521,17 @@ static const struct command_registration gw16012_command_handlers[] = {
 	COMMAND_REGISTRATION_DONE
 };
 
-struct jtag_interface gw16012_interface = {
+static struct jtag_interface gw16012_interface = {
+	.execute_queue = gw16012_execute_queue,
+};
+
+struct adapter_driver gw16012_adapter_driver = {
 	.name = "gw16012",
 	.transports = jtag_only,
 	.commands = gw16012_command_handlers,
 
 	.init = gw16012_init,
 	.quit = gw16012_quit,
-	.execute_queue = gw16012_execute_queue,
+
+	.jtag_ops = &gw16012_interface,
 };
diff --git a/src/jtag/drivers/imx_gpio.c b/src/jtag/drivers/imx_gpio.c
index d677e8a..7dcfb67 100644
--- a/src/jtag/drivers/imx_gpio.c
+++ b/src/jtag/drivers/imx_gpio.c
@@ -427,19 +427,25 @@ static const struct command_registration imx_gpio_command_handlers[] = {
 
 static const char * const imx_gpio_transports[] = { "jtag", "swd", NULL };
 
-struct jtag_interface imx_gpio_interface = {
-	.name = "imx_gpio",
+static struct jtag_interface imx_gpio_interface = {
 	.supported = DEBUG_CAP_TMS_SEQ,
 	.execute_queue = bitbang_execute_queue,
+};
+
+struct adapter_driver imx_gpio_adapter_driver = {
+	.name = "imx_gpio",
 	.transports = imx_gpio_transports,
-	.swd = &bitbang_swd,
-	.speed = imx_gpio_speed,
-	.khz = imx_gpio_khz,
-	.speed_div = imx_gpio_speed_div,
 	.commands = imx_gpio_command_handlers,
+
 	.init = imx_gpio_init,
 	.quit = imx_gpio_quit,
 	.reset = imx_gpio_reset,
+	.speed = imx_gpio_speed,
+	.khz = imx_gpio_khz,
+	.speed_div = imx_gpio_speed_div,
+
+	.jtag_ops = &imx_gpio_interface,
+	.swd_ops = &bitbang_swd,
 };
 
 static bool imx_gpio_jtag_mode_possible(void)
diff --git a/src/jtag/drivers/jlink.c b/src/jtag/drivers/jlink.c
index 402ff99..3dcadc8 100644
--- a/src/jtag/drivers/jlink.c
+++ b/src/jtag/drivers/jlink.c
@@ -2267,18 +2267,24 @@ static const struct swd_driver jlink_swd = {
 
 static const char * const jlink_transports[] = { "jtag", "swd", NULL };
 
-struct jtag_interface jlink_interface = {
+static struct jtag_interface jlink_interface = {
+	.execute_queue = &jlink_execute_queue,
+};
+
+struct adapter_driver jlink_adapter_driver = {
 	.name = "jlink",
-	.commands = jlink_command_handlers,
 	.transports = jlink_transports,
-	.swd = &jlink_swd,
-	.execute_queue = &jlink_execute_queue,
-	.speed = &jlink_speed,
-	.speed_div = &jlink_speed_div,
-	.khz = &jlink_khz,
+	.commands = jlink_command_handlers,
+
 	.init = &jlink_init,
 	.quit = &jlink_quit,
 	.reset = &jlink_reset_safe,
+	.speed = &jlink_speed,
+	.khz = &jlink_khz,
+	.speed_div = &jlink_speed_div,
 	.config_trace = &config_trace,
 	.poll_trace = &poll_trace,
+
+	.jtag_ops = &jlink_interface,
+	.swd_ops = &jlink_swd,
 };
diff --git a/src/jtag/drivers/jtag_vpi.c b/src/jtag/drivers/jtag_vpi.c
index 7ac7e96..e5124b5 100644
--- a/src/jtag/drivers/jtag_vpi.c
+++ b/src/jtag/drivers/jtag_vpi.c
@@ -627,13 +627,18 @@ static const struct command_registration jtag_vpi_command_handlers[] = {
 	COMMAND_REGISTRATION_DONE
 };
 
-struct jtag_interface jtag_vpi_interface = {
-	.name = "jtag_vpi",
+static struct jtag_interface jtag_vpi_interface = {
 	.supported = DEBUG_CAP_TMS_SEQ,
-	.commands = jtag_vpi_command_handlers,
+	.execute_queue = jtag_vpi_execute_queue,
+};
+
+struct adapter_driver jtag_vpi_adapter_driver = {
+	.name = "jtag_vpi",
 	.transports = jtag_only,
+	.commands = jtag_vpi_command_handlers,
 
 	.init = jtag_vpi_init,
 	.quit = jtag_vpi_quit,
-	.execute_queue = jtag_vpi_execute_queue,
+
+	.jtag_ops = &jtag_vpi_interface,
 };
diff --git a/src/jtag/drivers/kitprog.c b/src/jtag/drivers/kitprog.c
index a08f036..4894411 100644
--- a/src/jtag/drivers/kitprog.c
+++ b/src/jtag/drivers/kitprog.c
@@ -935,12 +935,14 @@ static const struct swd_driver kitprog_swd = {
 
 static const char * const kitprog_transports[] = { "swd", NULL };
 
-struct jtag_interface kitprog_interface = {
+struct adapter_driver kitprog_adapter_driver = {
 	.name = "kitprog",
-	.commands = kitprog_command_handlers,
 	.transports = kitprog_transports,
-	.swd = &kitprog_swd,
+	.commands = kitprog_command_handlers,
+
 	.init = kitprog_init,
 	.quit = kitprog_quit,
 	.reset = kitprog_reset,
+
+	.swd_ops = &kitprog_swd,
 };
diff --git a/src/jtag/drivers/opendous.c b/src/jtag/drivers/opendous.c
index 5f352af..539f475 100644
--- a/src/jtag/drivers/opendous.c
+++ b/src/jtag/drivers/opendous.c
@@ -234,13 +234,19 @@ static const struct command_registration opendous_command_handlers[] = {
 	COMMAND_REGISTRATION_DONE
 };
 
-struct jtag_interface opendous_interface = {
+static struct jtag_interface opendous_interface = {
+	.execute_queue = opendous_execute_queue,
+};
+
+struct adapter_driver opendous_adapter_driver = {
 	.name = "opendous",
 	.transports = jtag_only,
 	.commands = opendous_command_handlers,
-	.execute_queue = opendous_execute_queue,
+
 	.init = opendous_init,
 	.quit = opendous_quit,
+
+	.jtag_ops = &opendous_interface,
 };
 
 static int opendous_execute_queue(void)
diff --git a/src/jtag/drivers/openjtag.c b/src/jtag/drivers/openjtag.c
index 7a3aa23..24960a8 100644
--- a/src/jtag/drivers/openjtag.c
+++ b/src/jtag/drivers/openjtag.c
@@ -892,17 +892,20 @@ static const struct command_registration openjtag_command_handlers[] = {
 	COMMAND_REGISTRATION_DONE
 };
 
-struct jtag_interface openjtag_interface = {
+static struct jtag_interface openjtag_interface = {
+	.execute_queue = openjtag_execute_queue,
+};
+
+struct adapter_driver openjtag_adapter_driver = {
 	.name = "openjtag",
 	.transports = jtag_only,
 	.commands = openjtag_command_handlers,
 
-	.execute_queue = openjtag_execute_queue,
-	.speed = openjtag_speed,
-	.speed_div = openjtag_speed_div,
-	.khz = openjtag_khz,
 	.init = openjtag_init,
 	.quit = openjtag_quit,
-};
-
+	.speed = openjtag_speed,
+	.khz = openjtag_khz,
+	.speed_div = openjtag_speed_div,
 
+	.jtag_ops = &openjtag_interface,
+};
diff --git a/src/jtag/drivers/osbdm.c b/src/jtag/drivers/osbdm.c
index 5db36a1..ed89a79 100644
--- a/src/jtag/drivers/osbdm.c
+++ b/src/jtag/drivers/osbdm.c
@@ -688,12 +688,16 @@ static int osbdm_init(void)
 	return ERROR_OK;
 }
 
-struct jtag_interface osbdm_interface = {
-	.name = "osbdm",
+static struct jtag_interface osbdm_interface = {
+	.execute_queue = osbdm_execute_queue,
+};
 
+struct adapter_driver osbdm_adapter_driver = {
+	.name = "osbdm",
 	.transports = jtag_only,
-	.execute_queue = osbdm_execute_queue,
 
 	.init = osbdm_init,
-	.quit = osbdm_quit
+	.quit = osbdm_quit,
+
+	.jtag_ops = &osbdm_interface,
 };
diff --git a/src/jtag/drivers/parport.c b/src/jtag/drivers/parport.c
index 3a589a3..6d15203 100644
--- a/src/jtag/drivers/parport.c
+++ b/src/jtag/drivers/parport.c
@@ -513,17 +513,22 @@ static const struct command_registration parport_command_handlers[] = {
 	COMMAND_REGISTRATION_DONE
 };
 
-struct jtag_interface parport_interface = {
-	.name = "parport",
+static struct jtag_interface parport_interface = {
 	.supported = DEBUG_CAP_TMS_SEQ,
+	.execute_queue = bitbang_execute_queue,
+};
+
+struct adapter_driver parport_adapter_driver = {
+	.name = "parport",
 	.transports = jtag_only,
 	.commands = parport_command_handlers,
 
 	.init = parport_init,
 	.quit = parport_quit,
 	.reset = parport_reset,
+	.speed = parport_speed,
 	.khz = parport_khz,
 	.speed_div = parport_speed_div,
-	.speed = parport_speed,
-	.execute_queue = bitbang_execute_queue,
+
+	.jtag_ops = &parport_interface,
 };
diff --git a/src/jtag/drivers/presto.c b/src/jtag/drivers/presto.c
index 2a94d06..3849a27 100644
--- a/src/jtag/drivers/presto.c
+++ b/src/jtag/drivers/presto.c
@@ -561,15 +561,20 @@ static int presto_jtag_quit(void)
 	return ERROR_OK;
 }
 
-struct jtag_interface presto_interface = {
+static struct jtag_interface presto_interface = {
+	.execute_queue = bitq_execute_queue,
+};
+
+struct adapter_driver presto_adapter_driver = {
 	.name = "presto",
 	.transports = jtag_only,
 	.commands = presto_command_handlers,
 
-	.execute_queue = bitq_execute_queue,
+	.init = presto_jtag_init,
+	.quit = presto_jtag_quit,
 	.speed = presto_jtag_speed,
 	.khz = presto_adapter_khz,
 	.speed_div = presto_jtag_speed_div,
-	.init = presto_jtag_init,
-	.quit = presto_jtag_quit,
+
+	.jtag_ops = &presto_interface,
 };
diff --git a/src/jtag/drivers/remote_bitbang.c b/src/jtag/drivers/remote_bitbang.c
index 70280d2..6637952 100644
--- a/src/jtag/drivers/remote_bitbang.c
+++ b/src/jtag/drivers/remote_bitbang.c
@@ -341,12 +341,18 @@ static const struct command_registration remote_bitbang_command_handlers[] = {
 	COMMAND_REGISTRATION_DONE,
 };
 
-struct jtag_interface remote_bitbang_interface = {
-	.name = "remote_bitbang",
+static struct jtag_interface remote_bitbang_interface = {
 	.execute_queue = &bitbang_execute_queue,
+};
+
+struct adapter_driver remote_bitbang_adapter_driver = {
+	.name = "remote_bitbang",
 	.transports = jtag_only,
 	.commands = remote_bitbang_command_handlers,
+
 	.init = &remote_bitbang_init,
 	.quit = &remote_bitbang_quit,
 	.reset = &remote_bitbang_reset,
+
+	.jtag_ops = &remote_bitbang_interface,
 };
diff --git a/src/jtag/drivers/rlink.c b/src/jtag/drivers/rlink.c
index 317e8b8..e053399 100644
--- a/src/jtag/drivers/rlink.c
+++ b/src/jtag/drivers/rlink.c
@@ -1660,13 +1660,19 @@ static int rlink_quit(void)
 	return ERROR_OK;
 }
 
-struct jtag_interface rlink_interface = {
+static struct jtag_interface rlink_interface = {
+	.execute_queue = rlink_execute_queue,
+};
+
+struct adapter_driver rlink_adapter_driver = {
 	.name = "rlink",
 	.transports = jtag_only,
+
 	.init = rlink_init,
 	.quit = rlink_quit,
 	.speed = rlink_speed,
-	.speed_div = rlink_speed_div,
 	.khz = rlink_khz,
-	.execute_queue = rlink_execute_queue,
+	.speed_div = rlink_speed_div,
+
+	.jtag_ops = &rlink_interface,
 };
diff --git a/src/jtag/drivers/sysfsgpio.c b/src/jtag/drivers/sysfsgpio.c
index 7063000..bf33767 100644
--- a/src/jtag/drivers/sysfsgpio.c
+++ b/src/jtag/drivers/sysfsgpio.c
@@ -551,16 +551,22 @@ static int sysfsgpio_quit(void);
 
 static const char * const sysfsgpio_transports[] = { "jtag", "swd", NULL };
 
-struct jtag_interface sysfsgpio_interface = {
-	.name = "sysfsgpio",
+static struct jtag_interface sysfsgpio_interface = {
 	.supported = DEBUG_CAP_TMS_SEQ,
 	.execute_queue = bitbang_execute_queue,
+};
+
+struct adapter_driver sysfsgpio_adapter_driver = {
+	.name = "sysfsgpio",
 	.transports = sysfsgpio_transports,
-	.swd = &bitbang_swd,
 	.commands = sysfsgpio_command_handlers,
+
 	.init = sysfsgpio_init,
 	.quit = sysfsgpio_quit,
 	.reset = sysfsgpio_reset,
+
+	.jtag_ops = &sysfsgpio_interface,
+	.swd_ops = &bitbang_swd,
 };
 
 static struct bitbang_interface sysfsgpio_bitbang = {
diff --git a/src/jtag/drivers/ulink.c b/src/jtag/drivers/ulink.c
index bbe08aa..77fbe61 100644
--- a/src/jtag/drivers/ulink.c
+++ b/src/jtag/drivers/ulink.c
@@ -235,7 +235,7 @@ int ulink_queue_stableclocks(struct ulink *device, struct jtag_command *cmd);
 int ulink_post_process_scan(struct ulink_cmd *ulink_cmd);
 int ulink_post_process_queue(struct ulink *device);
 
-/* JTAG driver functions (registered in struct jtag_interface) */
+/* adapter driver functions */
 static int ulink_execute_queue(void);
 static int ulink_khz(int khz, int *jtag_speed);
 static int ulink_speed(int speed);
@@ -2272,17 +2272,20 @@ static const struct command_registration ulink_command_handlers[] = {
 	COMMAND_REGISTRATION_DONE,
 };
 
-struct jtag_interface ulink_interface = {
-	.name = "ulink",
+static struct jtag_interface ulink_interface = {
+	.execute_queue = ulink_execute_queue,
+};
 
-	.commands = ulink_command_handlers,
+struct adapter_driver ulink_adapter_driver = {
+	.name = "ulink",
 	.transports = jtag_only,
+	.commands = ulink_command_handlers,
 
-	.execute_queue = ulink_execute_queue,
-	.khz = ulink_khz,
+	.init = ulink_init,
+	.quit = ulink_quit,
 	.speed = ulink_speed,
+	.khz = ulink_khz,
 	.speed_div = ulink_speed_div,
 
-	.init = ulink_init,
-	.quit = ulink_quit
+	.jtag_ops = &ulink_interface,
 };
diff --git a/src/jtag/drivers/usb_blaster/usb_blaster.c b/src/jtag/drivers/usb_blaster/usb_blaster.c
index 48534a2..fcb594f 100644
--- a/src/jtag/drivers/usb_blaster/usb_blaster.c
+++ b/src/jtag/drivers/usb_blaster/usb_blaster.c
@@ -1071,13 +1071,18 @@ static const struct command_registration ublast_command_handlers[] = {
 	COMMAND_REGISTRATION_DONE
 };
 
-struct jtag_interface usb_blaster_interface = {
+static struct jtag_interface usb_blaster_interface = {
+	.supported = DEBUG_CAP_TMS_SEQ,
+	.execute_queue = ublast_execute_queue,
+};
+
+struct adapter_driver usb_blaster_adapter_driver = {
 	.name = "usb_blaster",
 	.transports = jtag_only,
 	.commands = ublast_command_handlers,
-	.supported = DEBUG_CAP_TMS_SEQ,
 
-	.execute_queue = ublast_execute_queue,
 	.init = ublast_init,
 	.quit = ublast_quit,
+
+	.jtag_ops = &usb_blaster_interface,
 };
diff --git a/src/jtag/drivers/usbprog.c b/src/jtag/drivers/usbprog.c
index 35a9520..6517ce4 100644
--- a/src/jtag/drivers/usbprog.c
+++ b/src/jtag/drivers/usbprog.c
@@ -596,11 +596,16 @@ static void usbprog_jtag_tms_send(struct usbprog_jtag *usbprog_jtag)
 	}
 }
 
-struct jtag_interface usbprog_interface = {
+static struct jtag_interface usbprog_interface = {
+	.execute_queue = usbprog_execute_queue,
+};
+
+struct adapter_driver usbprog_adapter_driver = {
 	.name = "usbprog",
 	.transports = jtag_only,
 
-	.execute_queue = usbprog_execute_queue,
 	.init = usbprog_init,
-	.quit = usbprog_quit
+	.quit = usbprog_quit,
+
+	.jtag_ops = &usbprog_interface,
 };
diff --git a/src/jtag/drivers/vsllink.c b/src/jtag/drivers/vsllink.c
index 5dd1bca..eb43702 100644
--- a/src/jtag/drivers/vsllink.c
+++ b/src/jtag/drivers/vsllink.c
@@ -948,18 +948,23 @@ static const struct swd_driver vsllink_swd_driver = {
 	.run = vsllink_swd_run_queue,
 };
 
-struct jtag_interface vsllink_interface = {
-	.name = "vsllink",
+static struct jtag_interface vsllink_interface = {
 	.supported = DEBUG_CAP_TMS_SEQ,
-	.commands = vsllink_command_handlers,
+	.execute_queue = vsllink_execute_queue,
+};
+
+struct adapter_driver vsllink_adapter_driver = {
+	.name = "vsllink",
 	.transports = vsllink_transports,
-	.swd = &vsllink_swd_driver,
+	.commands = vsllink_command_handlers,
 
 	.init = vsllink_init,
 	.quit = vsllink_quit,
 	.reset = vsllink_reset,
-	.khz = vsllink_khz,
 	.speed = vsllink_speed,
+	.khz = vsllink_khz,
 	.speed_div = vsllink_speed_div,
-	.execute_queue = vsllink_execute_queue,
+
+	.jtag_ops = &vsllink_interface,
+	.swd_ops = &vsllink_swd_driver,
 };
diff --git a/src/jtag/drivers/xds110.c b/src/jtag/drivers/xds110.c
index f089924..14bfe9c 100644
--- a/src/jtag/drivers/xds110.c
+++ b/src/jtag/drivers/xds110.c
@@ -2038,17 +2038,22 @@ static const struct swd_driver xds110_swd_driver = {
 
 static const char * const xds110_transport[] = { "swd", "jtag", NULL };
 
-struct jtag_interface xds110_interface = {
+static struct jtag_interface xds110_interface = {
+	.execute_queue = xds110_execute_queue,
+};
+
+struct adapter_driver xds110_adapter_driver = {
 	.name = "xds110",
-	.commands = xds110_command_handlers,
-	.swd = &xds110_swd_driver,
 	.transports = xds110_transport,
+	.commands = xds110_command_handlers,
 
-	.execute_queue = xds110_execute_queue,
-	.speed = xds110_speed,
-	.speed_div = xds110_speed_div,
-	.khz = xds110_khz,
 	.init = xds110_init,
 	.quit = xds110_quit,
 	.reset = xds110_reset,
+	.speed = xds110_speed,
+	.khz = xds110_khz,
+	.speed_div = xds110_speed_div,
+
+	.jtag_ops = &xds110_interface,
+	.swd_ops = &xds110_swd_driver,
 };
diff --git a/src/jtag/hla/hla_interface.c b/src/jtag/hla/hla_interface.c
index dbbebed..95233c0 100644
--- a/src/jtag/hla/hla_interface.c
+++ b/src/jtag/hla/hla_interface.c
@@ -346,10 +346,11 @@ static const struct command_registration hl_interface_command_handlers[] = {
 	COMMAND_REGISTRATION_DONE
 };
 
-struct jtag_interface hl_interface = {
+struct adapter_driver hl_adapter_driver = {
 	.name = "hla",
-	.commands = hl_interface_command_handlers,
 	.transports = hl_transports,
+	.commands = hl_interface_command_handlers,
+
 	.init = hl_interface_init,
 	.quit = hl_interface_quit,
 	.reset = hl_interface_reset,
@@ -358,4 +359,6 @@ struct jtag_interface hl_interface = {
 	.speed_div = &hl_interface_speed_div,
 	.config_trace = &hl_interface_config_trace,
 	.poll_trace = &hl_interface_poll_trace,
+
+	/* no ops for HLA, targets hla_target and stm8 intercept them all */
 };
diff --git a/src/jtag/interface.h b/src/jtag/interface.h
index c5579f5..feda356 100644
--- a/src/jtag/interface.h
+++ b/src/jtag/interface.h
@@ -192,32 +192,34 @@ static inline tap_state_t jtag_debug_state_machine(const void *tms_buf,
  * debugging interface.
  */
 struct jtag_interface {
-	/** The name of the JTAG interface driver. */
-	const char * const name;
-
 	/**
 	 * Bit vector listing capabilities exposed by this driver.
 	 */
 	unsigned supported;
 #define DEBUG_CAP_TMS_SEQ	(1 << 0)
 
-	/** transports supported in C code (NULL terminated vector) */
-	const char * const *transports;
-
-	const struct swd_driver *swd;
-
 	/**
 	 * Execute queued commands.
 	 * @returns ERROR_OK on success, or an error code on failure.
 	 */
 	int (*execute_queue)(void);
+};
 
-	/**
-	 * Set the interface speed.
-	 * @param speed The new interface speed setting.
-	 * @returns ERROR_OK on success, or an error code on failure.
-	 */
-	int (*speed)(int speed);
+/**
+ * Represents a driver for a debugging interface
+ *
+ * @todo We need a per-instance structure too, and changes to pass
+ * that structure to the driver.  Instances can for example be in
+ * either SWD or JTAG modes.  This will help remove globals, and
+ * eventually to cope with systems which have more than one such
+ * debugging interface.
+ */
+struct adapter_driver {
+	/** The name of the interface driver. */
+	const char * const name;
+
+	/** transports supported in C code (NULL terminated vector) */
+	const char * const *transports;
 
 	/**
 	 * The interface driver may register additional commands to expose
@@ -261,6 +263,13 @@ struct jtag_interface {
 	int (*reset)(int srst, int trst);
 
 	/**
+	 * Set the interface speed.
+	 * @param speed The new interface speed setting.
+	 * @returns ERROR_OK on success, or an error code on failure.
+	 */
+	int (*speed)(int speed);
+
+	/**
 	 * Returns JTAG maxium speed for KHz. 0 = RTCK. The function returns
 	 *  a failure if it can't support the KHz/RTCK.
 	 *
@@ -336,6 +345,12 @@ struct jtag_interface {
 	 * @returns ERROR_OK on success, an error code on failure.
 	 */
 	int (*poll_trace)(uint8_t *buf, size_t *size);
+
+	/** Low-level JTAG APIs */
+	struct jtag_interface *jtag_ops;
+
+	/** Low-level SWD APIs */
+	const struct swd_driver *swd_ops;
 };
 
 extern const char * const jtag_only[];
diff --git a/src/jtag/interfaces.c b/src/jtag/interfaces.c
index 286a73a..c354846 100644
--- a/src/jtag/interfaces.c
+++ b/src/jtag/interfaces.c
@@ -34,106 +34,106 @@
 
 /** @file
  * This file includes declarations for all built-in jtag interfaces,
- * which are then listed in the jtag_interfaces array.
+ * which are then listed in the adapter_drivers array.
  *
  * Dynamic loading can be implemented be searching for shared libraries
- * that contain a jtag_interface structure that can added to this list.
+ * that contain an adapter_driver structure that can added to this list.
  */
 
 #if BUILD_ZY1000 == 1
-extern struct jtag_interface zy1000_interface;
+extern struct adapter_driver zy1000_adapter_driver;
 #elif defined(BUILD_MINIDRIVER_DUMMY)
-extern struct jtag_interface minidummy_interface;
+extern struct adapter_driver minidummy_adapter_driver;
 #else /* standard drivers */
 #if BUILD_PARPORT == 1
-extern struct jtag_interface parport_interface;
+extern struct adapter_driver parport_adapter_driver;
 #endif
 #if BUILD_DUMMY == 1
-extern struct jtag_interface dummy_interface;
+extern struct adapter_driver dummy_adapter_driver;
 #endif
 #if BUILD_FTDI == 1
-extern struct jtag_interface ftdi_interface;
+extern struct adapter_driver ftdi_adapter_driver;
 #endif
 #if BUILD_USB_BLASTER == 1 || BUILD_USB_BLASTER_2 == 1
-extern struct jtag_interface usb_blaster_interface;
+extern struct adapter_driver usb_blaster_adapter_driver;
 #endif
 #if BUILD_JTAG_VPI == 1
-extern struct jtag_interface jtag_vpi_interface;
+extern struct adapter_driver jtag_vpi_adapter_driver;
 #endif
 #if BUILD_FT232R == 1
-extern struct jtag_interface ft232r_interface;
+extern struct adapter_driver ft232r_adapter_driver;
 #endif
 #if BUILD_AMTJTAGACCEL == 1
-extern struct jtag_interface amt_jtagaccel_interface;
+extern struct adapter_driver amt_jtagaccel_adapter_driver;
 #endif
 #if BUILD_EP93XX == 1
-extern struct jtag_interface ep93xx_interface;
+extern struct adapter_driver ep93xx_adapter_driver;
 #endif
 #if BUILD_AT91RM9200 == 1
-extern struct jtag_interface at91rm9200_interface;
+extern struct adapter_driver at91rm9200_adapter_driver;
 #endif
 #if BUILD_GW16012 == 1
-extern struct jtag_interface gw16012_interface;
+extern struct adapter_driver gw16012_adapter_driver;
 #endif
 #if BUILD_PRESTO
-extern struct jtag_interface presto_interface;
+extern struct adapter_driver presto_adapter_driver;
 #endif
 #if BUILD_USBPROG == 1
-extern struct jtag_interface usbprog_interface;
+extern struct adapter_driver usbprog_adapter_driver;
 #endif
 #if BUILD_OPENJTAG == 1
-extern struct jtag_interface openjtag_interface;
+extern struct adapter_driver openjtag_adapter_driver;
 #endif
 #if BUILD_JLINK == 1
-extern struct jtag_interface jlink_interface;
+extern struct adapter_driver jlink_adapter_driver;
 #endif
 #if BUILD_VSLLINK == 1
-extern struct jtag_interface vsllink_interface;
+extern struct adapter_driver vsllink_adapter_driver;
 #endif
 #if BUILD_RLINK == 1
-extern struct jtag_interface rlink_interface;
+extern struct adapter_driver rlink_adapter_driver;
 #endif
 #if BUILD_ULINK == 1
-extern struct jtag_interface ulink_interface;
+extern struct adapter_driver ulink_adapter_driver;
 #endif
 #if BUILD_ARMJTAGEW == 1
-extern struct jtag_interface armjtagew_interface;
+extern struct adapter_driver armjtagew_adapter_driver;
 #endif
 #if BUILD_BUSPIRATE == 1
-extern struct jtag_interface buspirate_interface;
+extern struct adapter_driver buspirate_adapter_driver;
 #endif
 #if BUILD_REMOTE_BITBANG == 1
-extern struct jtag_interface remote_bitbang_interface;
+extern struct adapter_driver remote_bitbang_adapter_driver;
 #endif
 #if BUILD_HLADAPTER == 1
-extern struct jtag_interface hl_interface;
+extern struct adapter_driver hl_adapter_driver;
 #endif
 #if BUILD_OSBDM == 1
-extern struct jtag_interface osbdm_interface;
+extern struct adapter_driver osbdm_adapter_driver;
 #endif
 #if BUILD_OPENDOUS == 1
-extern struct jtag_interface opendous_interface;
+extern struct adapter_driver opendous_adapter_driver;
 #endif
 #if BUILD_SYSFSGPIO == 1
-extern struct jtag_interface sysfsgpio_interface;
+extern struct adapter_driver sysfsgpio_adapter_driver;
 #endif
 #if BUILD_AICE == 1
-extern struct jtag_interface aice_interface;
+extern struct adapter_driver aice_adapter_driver;
 #endif
 #if BUILD_BCM2835GPIO == 1
-extern struct jtag_interface bcm2835gpio_interface;
+extern struct adapter_driver bcm2835gpio_adapter_driver;
 #endif
 #if BUILD_CMSIS_DAP == 1
-extern struct jtag_interface cmsis_dap_interface;
+extern struct adapter_driver cmsis_dap_adapter_driver;
 #endif
 #if BUILD_KITPROG == 1
-extern struct jtag_interface kitprog_interface;
+extern struct adapter_driver kitprog_adapter_driver;
 #endif
 #if BUILD_IMX_GPIO == 1
-extern struct jtag_interface imx_gpio_interface;
+extern struct adapter_driver imx_gpio_adapter_driver;
 #endif
 #if BUILD_XDS110 == 1
-extern struct jtag_interface xds110_interface;
+extern struct adapter_driver xds110_adapter_driver;
 #endif
 #endif /* standard drivers */
 
@@ -144,107 +144,107 @@ extern struct jtag_interface xds110_interface;
  * The list should be defined to contain either one minidriver interface
  * or some number of standard driver interfaces, never both.
  */
-struct jtag_interface *jtag_interfaces[] = {
+struct adapter_driver *adapter_drivers[] = {
 #if BUILD_ZY1000 == 1
-		&zy1000_interface,
+		&zy1000_adapter_driver,
 #elif defined(BUILD_MINIDRIVER_DUMMY)
-		&minidummy_interface,
+		&minidummy_adapter_driver,
 #else /* standard drivers */
 #if BUILD_PARPORT == 1
-		&parport_interface,
+		&parport_adapter_driver,
 #endif
 #if BUILD_DUMMY == 1
-		&dummy_interface,
+		&dummy_adapter_driver,
 #endif
 #if BUILD_FTDI == 1
-		&ftdi_interface,
+		&ftdi_adapter_driver,
 #endif
 #if BUILD_USB_BLASTER || BUILD_USB_BLASTER_2 == 1
-		&usb_blaster_interface,
+		&usb_blaster_adapter_driver,
 #endif
 #if BUILD_JTAG_VPI == 1
-		&jtag_vpi_interface,
+		&jtag_vpi_adapter_driver,
 #endif
 #if BUILD_FT232R == 1
-		&ft232r_interface,
+		&ft232r_adapter_driver,
 #endif
 #if BUILD_AMTJTAGACCEL == 1
-		&amt_jtagaccel_interface,
+		&amt_jtagaccel_adapter_driver,
 #endif
 #if BUILD_EP93XX == 1
-		&ep93xx_interface,
+		&ep93xx_adapter_driver,
 #endif
 #if BUILD_AT91RM9200 == 1
-		&at91rm9200_interface,
+		&at91rm9200_adapter_driver,
 #endif
 #if BUILD_GW16012 == 1
-		&gw16012_interface,
+		&gw16012_adapter_driver,
 #endif
 #if BUILD_PRESTO
-		&presto_interface,
+		&presto_adapter_driver,
 #endif
 #if BUILD_USBPROG == 1
-		&usbprog_interface,
+		&usbprog_adapter_driver,
 #endif
 #if BUILD_OPENJTAG == 1
-		&openjtag_interface,
+		&openjtag_adapter_driver,
 #endif
 #if BUILD_JLINK == 1
-		&jlink_interface,
+		&jlink_adapter_driver,
 #endif
 #if BUILD_VSLLINK == 1
-		&vsllink_interface,
+		&vsllink_adapter_driver,
 #endif
 #if BUILD_RLINK == 1
-		&rlink_interface,
+		&rlink_adapter_driver,
 #endif
 #if BUILD_ULINK == 1
-		&ulink_interface,
+		&ulink_adapter_driver,
 #endif
 #if BUILD_ARMJTAGEW == 1
-		&armjtagew_interface,
+		&armjtagew_adapter_driver,
 #endif
 #if BUILD_BUSPIRATE == 1
-		&buspirate_interface,
+		&buspirate_adapter_driver,
 #endif
 #if BUILD_REMOTE_BITBANG == 1
-		&remote_bitbang_interface,
+		&remote_bitbang_adapter_driver,
 #endif
 #if BUILD_HLADAPTER == 1
-		&hl_interface,
+		&hl_adapter_driver,
 #endif
 #if BUILD_OSBDM == 1
-		&osbdm_interface,
+		&osbdm_adapter_driver,
 #endif
 #if BUILD_OPENDOUS == 1
-		&opendous_interface,
+		&opendous_adapter_driver,
 #endif
 #if BUILD_SYSFSGPIO == 1
-		&sysfsgpio_interface,
+		&sysfsgpio_adapter_driver,
 #endif
 #if BUILD_AICE == 1
-		&aice_interface,
+		&aice_adapter_driver,
 #endif
 #if BUILD_BCM2835GPIO == 1
-		&bcm2835gpio_interface,
+		&bcm2835gpio_adapter_driver,
 #endif
 #if BUILD_CMSIS_DAP == 1
-		&cmsis_dap_interface,
+		&cmsis_dap_adapter_driver,
 #endif
 #if BUILD_KITPROG == 1
-		&kitprog_interface,
+		&kitprog_adapter_driver,
 #endif
 #if BUILD_IMX_GPIO == 1
-		&imx_gpio_interface,
+		&imx_gpio_adapter_driver,
 #endif
 #if BUILD_XDS110 == 1
-		&xds110_interface,
+		&xds110_adapter_driver,
 #endif
 #endif /* standard drivers */
 		NULL,
 	};
 
-void jtag_interface_modules_load(const char *path)
+void adapter_driver_modules_load(const char *path)
 {
-	/* @todo: implement dynamic module loading for JTAG interface drivers */
+	/* @todo: implement dynamic module loading for adapter drivers */
 }
diff --git a/src/jtag/interfaces.h b/src/jtag/interfaces.h
index 02d201b..f85865a 100644
--- a/src/jtag/interfaces.h
+++ b/src/jtag/interfaces.h
@@ -36,9 +36,9 @@
 
 #include <jtag/interface.h>
 
-/** Dynamically load all JTAG interface modules from specified directory. */
-void jtag_interface_modules_load(const char *path);
+/** Dynamically load all adapter driver modules from specified directory. */
+void adapter_driver_modules_load(const char *path);
 
-extern struct jtag_interface *jtag_interfaces[];
+extern struct adapter_driver *adapter_drivers[];
 
 #endif /* OPENOCD_JTAG_INTERFACES_H */
diff --git a/src/jtag/minidummy/minidummy.c b/src/jtag/minidummy/minidummy.c
index 2f26004..1fce317 100644
--- a/src/jtag/minidummy/minidummy.c
+++ b/src/jtag/minidummy/minidummy.c
@@ -24,18 +24,24 @@
 #include <jtag/minidriver.h>
 #include <jtag/interface.h>
 
-struct jtag_interface minidummy_interface = {
-	.name = "minidummy",
+static struct jtag_interface minidummy_interface = {
 	.execute_queue = NULL,
-	.speed = NULL,
+};
+
+struct adapter_driver minidummy_adapter_driver = {
+	.name = "minidummy",
 	.transports = jtag_only,
 	.commands = NULL,
+
 	.init = NULL,
 	.quit = NULL,
+	.speed = NULL,
 	.khz = NULL,
 	.speed_div = NULL,
 	.power_dropout = NULL,
 	.srst_asserted = NULL,
+
+	.jtag_ops = &minidummy_interface,
 };
 
 int interface_jtag_execute_queue(void)
diff --git a/src/jtag/zy1000/zy1000.c b/src/jtag/zy1000/zy1000.c
index 1734983..48a3d4d 100644
--- a/src/jtag/zy1000/zy1000.c
+++ b/src/jtag/zy1000/zy1000.c
@@ -1237,17 +1237,23 @@ int zy1000_init(void)
 	return ERROR_OK;
 }
 
-struct jtag_interface zy1000_interface = {
-	.name = "ZY1000",
+static struct jtag_interface zy1000_interface = {
 	.supported = DEBUG_CAP_TMS_SEQ,
 	.execute_queue = NULL,
-	.speed = zy1000_speed,
+};
+
+struct adapter_driver zy1000_adapter_driver = {
+	.name = "ZY1000",
 	.transports = jtag_only,
 	.commands = zy1000_commands,
+
 	.init = zy1000_init,
 	.quit = zy1000_quit,
+	.speed = zy1000_speed,
 	.khz = zy1000_khz,
 	.speed_div = zy1000_speed_div,
 	.power_dropout = zy1000_power_dropout,
 	.srst_asserted = zy1000_srst_asserted,
+
+	.jtag_ops = &zy1000_interface,
 };
diff --git a/src/target/adi_v5_swd.c b/src/target/adi_v5_swd.c
index 68a50b1..8d11537 100644
--- a/src/target/adi_v5_swd.c
+++ b/src/target/adi_v5_swd.c
@@ -368,9 +368,9 @@ static const struct command_registration swd_handlers[] = {
 
 static int swd_select(struct command_context *ctx)
 {
-	/* FIXME: only place where global 'jtag_interface' is still needed */
-	extern struct jtag_interface *jtag_interface;
-	const struct swd_driver *swd = jtag_interface->swd;
+	/* FIXME: only place where global 'adapter_driver' is still needed */
+	extern struct adapter_driver *adapter_driver;
+	const struct swd_driver *swd = adapter_driver->swd_ops;
 	int retval;
 
 	retval = register_commands(ctx, NULL, swd_handlers);
diff --git a/src/target/arm_dap.c b/src/target/arm_dap.c
index 0f29578..4be94b4 100644
--- a/src/target/arm_dap.c
+++ b/src/target/arm_dap.c
@@ -34,7 +34,7 @@ static LIST_HEAD(all_dap);
 
 extern const struct dap_ops swd_dap_ops;
 extern const struct dap_ops jtag_dp_ops;
-extern struct jtag_interface *jtag_interface;
+extern struct adapter_driver *adapter_driver;
 
 /* DAP command support */
 struct arm_dap_object {
@@ -118,7 +118,7 @@ static int dap_init_all(void)
 
 		if (transport_is_swd()) {
 			dap->ops = &swd_dap_ops;
-			obj->swd = jtag_interface->swd;
+			obj->swd = adapter_driver->swd_ops;
 		} else
 			dap->ops = &jtag_dp_ops;