2 * Copyright (c) 2010 by David Brownell
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
23 * Infrastructure for specifying and managing the transport protocol
24 * used in a given debug or programming session.
26 * Examples of "debug-capable" transports are JTAG or SWD.
27 * Additionally, JTAG supports boundary scan testing.
29 * Examples of "programming-capable" transports include SPI or UART;
30 * those are used (often mediated by a ROM bootloader) for ISP style
31 * programming, to perform an initial load of code into flash, or
32 * sometimes into SRAM. Target code could use "variant" options to
33 * decide how to use such protocols. For example, Cortex-M3 cores
34 * from TI/Luminary and from NXP use different protocols for for
35 * UART or SPI based firmware loading.
37 * As a rule, there are protocols layered on top of the transport.
38 * For example, different chip families use JTAG in different ways
39 * for debugging. Also, each family that supports programming over
40 * a UART link for initial firmware loading tends to define its own
41 * messaging and error handling.
44 #include <helper/log.h>
45 #include <transport/transport.h>
47 extern struct command_context
*global_cmd_ctx
;
49 /*-----------------------------------------------------------------------*/
52 * Infrastructure internals
55 /** List of transports known to OpenOCD. */
56 static struct transport
*transport_list
;
59 * NULL-terminated Vector of names of transports which the
60 * currently selected debug adapter supports. This is declared
61 * by the time that adapter is fully set up.
63 static const char * const *allowed_transports
;
65 /** * The transport being used for the current OpenOCD session. */
66 static struct transport
*session
;
68 static int transport_select(struct command_context
*ctx
, const char *name
)
70 /* name may only identify a known transport;
71 * caller guarantees session's transport isn't yet set.*/
72 for (struct transport
*t
= transport_list
; t
; t
= t
->next
) {
73 if (strcmp(t
->name
, name
) == 0) {
74 int retval
= t
->select(ctx
);
75 /* select() registers commands specific to this
76 * transport, and may also reset the link, e.g.
77 * forcing it to JTAG or SWD mode.
79 if (retval
== ERROR_OK
)
82 LOG_ERROR("Error selecting '%s' as transport", t
->name
);
87 LOG_ERROR("No transport named '%s' is available.", name
);
92 * Called by debug adapter drivers, or affiliated Tcl config scripts,
93 * to declare the set of transports supported by an adapter. When
94 * there is only one member of that set, it is automatically selected.
96 int allow_transports(struct command_context
*ctx
, const char * const *vector
)
98 /* NOTE: caller is required to provide only a list
99 * of *valid* transport names
101 * REVISIT should we validate that? and insist there's
102 * at least one non-NULL element in that list?
104 * ... allow removals, e.g. external strapping prevents use
105 * of one transport; C code should be definitive about what
106 * can be used when all goes well.
108 if (allowed_transports
!= NULL
|| session
) {
109 LOG_ERROR("Can't modify the set of allowed transports.");
113 allowed_transports
= vector
;
115 /* autoselect if there's no choice ... */
117 LOG_INFO("only one transport option; autoselect '%s'", vector
[0]);
118 return transport_select(ctx
, vector
[0]);
125 * Used to verify corrrect adapter driver initialization.
127 * @returns true iff the adapter declared one or more transports.
129 bool transports_are_declared(void)
131 return allowed_transports
!= NULL
;
135 * Registers a transport. There are general purpose transports
136 * (such as JTAG), as well as relatively proprietary ones which are
137 * specific to a given chip (or chip family).
139 * Code implementing a transport needs to register it before it can
140 * be selected and then activated. This is a dynamic process, so
141 * that chips (and families) can define transports as needed (without
142 * nneeding error-prone static tables).
144 * @param new_transport the transport being registered. On a
145 * successful return, this memory is owned by the transport framework.
147 * @returns ERROR_OK on success, else a fault code.
149 int transport_register(struct transport
*new_transport
)
153 for (t
= transport_list
; t
; t
= t
->next
) {
154 if (strcmp(t
->name
, new_transport
->name
) == 0) {
155 LOG_ERROR("transport name already used");
160 if (!new_transport
->select
|| !new_transport
->init
)
161 LOG_ERROR("invalid transport %s", new_transport
->name
);
163 /* splice this into the list */
164 new_transport
->next
= transport_list
;
165 transport_list
= new_transport
;
166 LOG_DEBUG("register '%s'", new_transport
->name
);
172 * Returns the transport currently being used by this debug or
173 * programming session.
175 * @returns handle to the read-only transport entity.
177 struct transport
*get_current_transport(void)
179 /* REVISIT -- constify */
183 /*-----------------------------------------------------------------------*/
186 * Infrastructure for Tcl interface to transports.
190 * Makes and stores a copy of a set of transports passed as
191 * parameters to a command.
193 * @param vector where the resulting copy is stored, as an argv-style
194 * NULL-terminated vector.
196 COMMAND_HELPER(transport_list_parse
, char ***vector
)
199 unsigned n
= CMD_ARGC
;
205 return ERROR_COMMAND_SYNTAX_ERROR
;
207 /* our return vector must be NULL terminated */
208 argv
= calloc(n
+ 1, sizeof(char *));
212 for (unsigned i
= 0; i
< n
; i
++) {
215 for (t
= transport_list
; t
; t
= t
->next
) {
216 if (strcmp(t
->name
, CMD_ARGV
[i
]) != 0)
218 argv
[j
++] = strdup(CMD_ARGV
[i
]);
222 LOG_ERROR("no such transport '%s'", CMD_ARGV
[i
]);
231 for (unsigned i
= 0; i
< n
; i
++)
237 COMMAND_HANDLER(handle_transport_init
)
239 LOG_DEBUG("%s", __func__
);
241 LOG_ERROR("session transport was not selected. Use 'transport select <transport>'");
243 /* no session transport configured, print transports then fail */
244 LOG_ERROR("Transports available:");
245 const char * const *vector
= allowed_transports
;
247 LOG_ERROR("%s", *vector
);
253 return session
->init(CMD_CTX
);
256 COMMAND_HANDLER(handle_transport_list
)
259 return ERROR_COMMAND_SYNTAX_ERROR
;
261 command_print(CMD_CTX
, "The following transports are available:");
263 for (struct transport
*t
= transport_list
; t
; t
= t
->next
)
264 command_print(CMD_CTX
, "\t%s", t
->name
);
270 * Implements the Tcl "transport select" command, choosing the
271 * transport to be used in this debug session from among the
272 * set supported by the debug adapter being used. Return value
273 * is scriptable (allowing "if swd then..." etc).
275 static int jim_transport_select(Jim_Interp
*interp
, int argc
, Jim_Obj
* const *argv
)
279 case 1: /* autoselect if necessary, then return/display current config */
281 if (!allowed_transports
) {
282 LOG_ERROR("Debug adapter does not support any transports? Check config file order.");
285 LOG_INFO("auto-selecting first available session transport \"%s\". "
286 "To override use 'transport select <transport>'.", allowed_transports
[0]);
287 res
= transport_select(global_cmd_ctx
, allowed_transports
[0]);
291 Jim_SetResultString(interp
, session
->name
, -1);
296 if (!strcmp(session
->name
, argv
[1]->bytes
)) {
297 LOG_WARNING("Transport \"%s\" was already selected", session
->name
);
298 Jim_SetResultString(interp
, session
->name
, -1);
301 LOG_ERROR("Can't change session's transport after the initial selection was made");
306 /* Is this transport supported by our debug adapter?
307 * Example, "JTAG-only" means SWD is not supported.
309 * NOTE: requires adapter to have been set up, with
310 * transports declared via C.
312 if (!allowed_transports
) {
313 LOG_ERROR("Debug adapter doesn't support any transports?");
317 for (unsigned i
= 0; allowed_transports
[i
]; i
++) {
319 if (strcmp(allowed_transports
[i
], argv
[1]->bytes
) == 0) {
320 if (transport_select(global_cmd_ctx
, argv
[1]->bytes
) == ERROR_OK
) {
321 Jim_SetResultString(interp
, session
->name
, -1);
328 LOG_ERROR("Debug adapter doesn't support '%s' transport", argv
[1]->bytes
);
332 Jim_WrongNumArgs(interp
, 1, argv
, "[too many parameters]");
337 static const struct command_registration transport_commands
[] = {
340 .handler
= handle_transport_init
,
341 /* this would be COMMAND_CONFIG ... except that
342 * it needs to trigger event handlers that may
343 * require COMMAND_EXEC ...
346 .help
= "Initialize this session's transport",
351 .handler
= handle_transport_list
,
353 .help
= "list all built-in transports",
358 .jim_handler
= jim_transport_select
,
360 .help
= "Select this session's transport",
361 .usage
= "[transport_name]",
363 COMMAND_REGISTRATION_DONE
366 static const struct command_registration transport_group
[] = {
370 .help
= "Transport command group",
371 .chain
= transport_commands
,
374 COMMAND_REGISTRATION_DONE
377 int transport_register_commands(struct command_context
*ctx
)
379 return register_commands(ctx
, NULL
, transport_group
);
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