1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program; if not, write to the *
17 * Free Software Foundation, Inc., *
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
19 ***************************************************************************/
24 #include "binarybuffer.h"
29 #define _DEBUG_JTAG_IO_
33 * TLR - Test-Logic-Reset, RTI - Run-Test/Idle,
34 * SDS - Select-DR-Scan, CD - Capture-DR, SD - Shift-DR, E1D - Exit1-DR,
35 * PD - Pause-DR, E2D - Exit2-DR, UD - Update-DR,
36 * SIS - Select-IR-Scan, CI - Capture-IR, SI - Shift-IR, E1I - Exit1-IR,
37 * PI - Pause-IR, E2I - Exit2-IR, UI - Update-IR
41 TAP_TLR = 0x0, TAP_RTI = 0x8,
42 TAP_SDS = 0x1, TAP_CD = 0x2, TAP_SD = 0x3, TAP_E1D = 0x4,
43 TAP_PD = 0x5, TAP_E2D = 0x6, TAP_UD = 0x7,
44 TAP_SIS = 0x9, TAP_CI = 0xa, TAP_SI = 0xb, TAP_E1I = 0xc,
45 TAP_PI = 0xd, TAP_E2I = 0xe, TAP_UI = 0xf
48 typedef struct tap_transition_s
54 extern char* tap_state_strings[16];
55 extern int tap_move_map[16]; /* map 16 TAP states to 6 stable states */
56 extern u8 tap_move[6][6]; /* value scanned to TMS to move from one of six stable states to another */
57 extern tap_transition_t tap_transitions[16]; /* describe the TAP state diagram */
59 extern enum tap_state end_state; /* finish DR scans in dr_end_state */
60 extern enum tap_state cur_state; /* current TAP state */
62 extern enum tap_state cmd_queue_end_state; /* finish DR scans in dr_end_state */
63 extern enum tap_state cmd_queue_cur_state; /* current TAP state */
65 #define TAP_MOVE(from, to) tap_move[tap_move_map[from]][tap_move_map[to]]
67 typedef void * error_handler_t; /* Later on we can delete error_handler_t, but keep it for now to make patches more readable */
70 typedef int (*in_handler_t)(u8 *in_value, void *priv, struct scan_field_s *field);
72 typedef struct scan_field_s
74 int device; /* ordinal device number this instruction refers to */
75 int num_bits; /* number of bits this field specifies (up to 32) */
76 u8 *out_value; /* value to be scanned into the device */
77 u8 *out_mask; /* only masked bits care */
78 u8 *in_value; /* pointer to a 32-bit memory location to take data scanned out */
79 /* in_check_value/mask, in_handler_error_handler, in_handler_priv can be used by the in handler, otherwise they contain garbage */
80 u8 *in_check_value; /* used to validate scan results */
81 u8 *in_check_mask; /* check specified bits against check_value */
82 in_handler_t in_handler; /* process received buffer using this handler */
83 void *in_handler_priv; /* additional information for the in_handler */
89 /* IN: from device to host, OUT: from host to device */
90 SCAN_IN = 1, SCAN_OUT = 2, SCAN_IO = 3
93 typedef struct scan_command_s
95 int ir_scan; /* instruction/not data scan */
96 int num_fields; /* number of fields in *fields array */
97 scan_field_t *fields; /* pointer to an array of data scan fields */
98 enum tap_state end_state; /* TAP state in which JTAG commands should finish */
101 typedef struct statemove_command_s
103 enum tap_state end_state; /* TAP state in which JTAG commands should finish */
104 } statemove_command_t;
106 typedef struct pathmove_command_s
108 int num_states; /* number of states in *path */
109 enum tap_state *path; /* states that have to be passed */
110 } pathmove_command_t;
112 typedef struct runtest_command_s
114 int num_cycles; /* number of cycles that should be spent in Run-Test/Idle */
115 enum tap_state end_state; /* TAP state in which JTAG commands should finish */
118 typedef struct reset_command_s
120 int trst; /* trst/srst 0: deassert, 1: assert, -1: don't change */
124 typedef struct end_state_command_s
126 enum tap_state end_state; /* TAP state in which JTAG commands should finish */
127 } end_state_command_t;
129 typedef struct sleep_command_s
131 u32 us; /* number of microseconds to sleep */
134 typedef union jtag_command_container_u
136 scan_command_t *scan;
137 statemove_command_t *statemove;
138 pathmove_command_t *pathmove;
139 runtest_command_t *runtest;
140 reset_command_t *reset;
141 end_state_command_t *end_state;
142 sleep_command_t *sleep;
143 } jtag_command_container_t;
145 enum jtag_command_type
148 JTAG_STATEMOVE = 2, JTAG_RUNTEST = 3,
149 JTAG_RESET = 4, JTAG_END_STATE = 5,
150 JTAG_PATHMOVE = 6, JTAG_SLEEP = 7
153 typedef struct jtag_command_s
155 jtag_command_container_t cmd;
156 enum jtag_command_type type;
157 struct jtag_command_s *next;
160 extern jtag_command_t *jtag_command_queue;
162 typedef struct jtag_device_s
164 int ir_length; /* size of instruction register */
165 u8 *expected; /* Capture-IR expected value */
166 u8 *expected_mask; /* Capture-IR expected mask */
167 u32 idcode; /* device identification code */
168 u8 *cur_instr; /* current instruction */
169 int bypass; /* bypass register selected */
170 struct jtag_device_s *next;
173 extern jtag_device_t *jtag_devices;
174 extern int jtag_num_devices;
175 extern int jtag_ir_scan_size;
179 LINE_OPEN_DRAIN = 0x0,
180 LINE_PUSH_PULL = 0x1,
183 typedef struct jtag_interface_s
187 /* queued command execution
189 int (*execute_queue)(void);
191 /* interface initalization
193 int (*speed)(int speed);
194 int (*register_commands)(struct command_context_s *cmd_ctx);
208 extern char* jtag_event_strings[];
210 extern int jtag_trst;
211 extern int jtag_srst;
213 typedef struct jtag_event_callback_s
215 int (*callback)(enum jtag_event event, void *priv);
217 struct jtag_event_callback_s *next;
218 } jtag_event_callback_t;
220 extern jtag_event_callback_t *jtag_event_callbacks;
222 extern jtag_interface_t *jtag; /* global pointer to configured JTAG interface */
223 extern enum tap_state end_state;
224 extern enum tap_state cur_state;
226 extern int jtag_speed;
231 RESET_HAS_TRST = 0x1,
232 RESET_HAS_SRST = 0x2,
233 RESET_TRST_AND_SRST = 0x3,
234 RESET_SRST_PULLS_TRST = 0x4,
235 RESET_TRST_PULLS_SRST = 0x8,
236 RESET_TRST_OPEN_DRAIN = 0x10,
237 RESET_SRST_PUSH_PULL = 0x20,
240 extern enum reset_types jtag_reset_config;
243 extern int jtag_init(struct command_context_s *cmd_ctx);
244 extern int jtag_register_commands(struct command_context_s *cmd_ctx);
246 /* JTAG interface, can be implemented with a software or hardware fifo */
247 extern int jtag_add_ir_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
248 extern int interface_jtag_add_ir_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
249 extern int jtag_add_dr_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
250 extern int interface_jtag_add_dr_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
251 extern int jtag_add_plain_ir_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
252 extern int interface_jtag_add_plain_ir_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
253 extern int jtag_add_plain_dr_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
254 extern int interface_jtag_add_plain_dr_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
255 /* execute a state transition within the JTAG standard, but the exact path
256 * path that is taken is undefined. Many implementations use precisely
257 * 7 clocks to perform a transition, but it could be more or less
260 * The following assertions are made about certain common state moves:
262 * - A state move from Pause-[ID]R to Pause-[ID]R should always go through
263 * Update-[ID]R and Capture-[ID]R before returning to Pause-[ID]R, otherwise
264 * there's no way force a register update, if you can't go to Run-Test/Idle for
267 * - A state move from Pause-[ID]R to Shift-[ID]R must not go through
270 * - Run-Test/Idle must not be entered unless requested, because R-T/I may have
273 extern int jtag_add_statemove(enum tap_state endstate);
274 extern int interface_jtag_add_statemove(enum tap_state endstate);
275 /* A list of unambigious single clock state transitions, not
276 * all drivers can support this, but it is required for e.g.
277 * XScale and Xilinx support
279 * Note! TAP_TLR must not be used in the path!
281 extern int jtag_add_pathmove(int num_states, enum tap_state *path);
282 extern int interface_jtag_add_pathmove(int num_states, enum tap_state *path);
283 /* cycle precisely num_cycles in the TAP_RTI state */
284 extern int jtag_add_runtest(int num_cycles, enum tap_state endstate);
285 extern int interface_jtag_add_runtest(int num_cycles, enum tap_state endstate);
286 extern int jtag_add_reset(int trst, int srst);
287 extern int interface_jtag_add_reset(int trst, int srst);
288 extern int jtag_add_end_state(enum tap_state endstate);
289 extern int interface_jtag_add_end_state(enum tap_state endstate);
290 extern int jtag_add_sleep(u32 us);
291 extern int interface_jtag_add_sleep(u32 us);
293 * For software FIFO implementations, the queued commands can be executed
294 * during this call or earlier. A sw queue might decide to push out
295 * some of the jtag_add_xxx() operations once the queue is "big enough".
297 * This fn will return an error code if any of the prior jtag_add_xxx()
298 * calls caused a failure, e.g. check failure. Note that it does not
299 * matter if the operation was executed *before* jtag_execute_queue(),
300 * jtag_execute_queue() will still return an error code.
302 * All jtag_add_xxx() calls that have in_handler!=NULL will have been
303 * executed when this fn returns, but if what has been queued only
304 * clocks data out, without reading anything back, then JTAG could
305 * be running *after* jtag_execute_queue() returns. The API does
306 * not define a way to flush a hw FIFO that runs *after*
307 * jtag_execute_queue() returns.
309 * jtag_add_xxx() commands can either be executed immediately or
310 * at some time between the jtag_add_xxx() fn call and jtag_execute_queue().
312 extern int jtag_execute_queue(void);
313 /* can be implemented by hw+sw */
314 extern int interface_jtag_execute_queue(void);
316 /* JTAG support functions */
317 extern void jtag_set_check_value(scan_field_t *field, u8 *value, u8 *mask, error_handler_t *in_error_handler);
318 extern enum scan_type jtag_scan_type(scan_command_t *cmd);
319 extern int jtag_scan_size(scan_command_t *cmd);
320 extern int jtag_read_buffer(u8 *buffer, scan_command_t *cmd);
321 extern int jtag_build_buffer(scan_command_t *cmd, u8 **buffer);
322 extern jtag_device_t* jtag_get_device(int num);
323 extern void jtag_sleep(u32 us);
324 extern int jtag_call_event_callbacks(enum jtag_event event);
325 extern int jtag_register_event_callback(int (*callback)(enum jtag_event event, void *priv), void *priv);
327 extern int jtag_verify_capture_ir;
331 * JTAG subsystem uses codes between -100 and -199 */
333 #define ERROR_JTAG_INIT_FAILED (-100)
334 #define ERROR_JTAG_INVALID_INTERFACE (-101)
335 #define ERROR_JTAG_NOT_IMPLEMENTED (-102)
336 #define ERROR_JTAG_TRST_ASSERTED (-103)
337 #define ERROR_JTAG_QUEUE_FAILED (-104)
338 #define ERROR_JTAG_RESET_WOULD_ASSERT_TRST (-105)
339 #define ERROR_JTAG_RESET_CANT_SRST (-106)
340 #define ERROR_JTAG_DEVICE_ERROR (-107)