1 /***************************************************************************
2 * Copyright (C) 2007 by Pavel Chromy *
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 <jtag/jtag.h>
26 #include <jtag/interface.h>
29 struct bitq_interface
* bitq_interface
; /* low level bit queue interface */
31 /* state of input queue */
33 struct jtag_command
*cmd
; /* command currently processed */
34 int field_idx
; /* index of field currently being processed */
35 int bit_pos
; /* position of bit currently being processed */
36 int status
; /* processing status */
38 static struct bitq_state bitq_in_state
;
41 * input queue processing does not use jtag_read_buffer() to avoid unnecessary overhead
42 * no parameters, makes use of stored state information
44 static void bitq_in_proc(void)
46 /* loop through the queue */
47 while (bitq_in_state
.cmd
)
49 /* only JTAG_SCAN command may return data */
50 if (bitq_in_state
.cmd
->type
== JTAG_SCAN
)
52 /* loop through the fields */
53 while (bitq_in_state
.field_idx
< bitq_in_state
.cmd
->cmd
.scan
->num_fields
)
55 struct scan_field
*field
;
56 field
= &bitq_in_state
.cmd
->cmd
.scan
->fields
[bitq_in_state
.field_idx
];
60 while (bitq_in_state
.bit_pos
< field
->num_bits
)
62 /* index of byte being scanned */
63 int in_idx
= bitq_in_state
.bit_pos
/ 8;
64 /* mask of next bit to be scanned */
65 uint8_t in_mask
= 1 << (bitq_in_state
.bit_pos
% 8);
67 int tdo
= bitq_interface
->in();
70 #ifdef _DEBUG_JTAG_IO_
71 LOG_DEBUG("bitq in EOF");
76 field
->in_value
[in_idx
] = 0;
78 field
->in_value
[in_idx
] |= in_mask
;
79 bitq_in_state
.bit_pos
++;
83 bitq_in_state
.field_idx
++; /* advance to next field */
84 bitq_in_state
.bit_pos
= 0; /* start next field from the first bit */
87 bitq_in_state
.cmd
= bitq_in_state
.cmd
->next
; /* advance to next command */
88 bitq_in_state
.field_idx
= 0; /* preselect first field */
93 static void bitq_io(int tms
, int tdi
, int tdo_req
)
95 bitq_interface
->out(tms
, tdi
, tdo_req
);
96 /* check and process the input queue */
97 if (bitq_interface
->in_rdy())
102 static void bitq_end_state(tap_state_t state
)
104 if (!tap_is_state_stable(state
))
106 LOG_ERROR("BUG: %i is not a valid end state", state
);
109 tap_set_end_state(state
);
113 static void bitq_state_move(tap_state_t new_state
)
118 if (!tap_is_state_stable(tap_get_state()) || !tap_is_state_stable(new_state
))
120 LOG_ERROR("TAP move from or to unstable state");
124 tms_scan
= tap_get_tms_path(tap_get_state(), new_state
);
125 int tms_count
= tap_get_tms_path_len(tap_get_state(), new_state
);
127 for (i
= 0; i
< tms_count
; i
++)
129 bitq_io(tms_scan
& 1, 0, 0);
133 tap_set_state(new_state
);
137 static void bitq_path_move(struct pathmove_command
*cmd
)
141 for (i
= 0; i
<= cmd
->num_states
; i
++)
143 if (tap_state_transition(tap_get_state(), false) == cmd
->path
[i
])
145 else if (tap_state_transition(tap_get_state(), true) == cmd
->path
[i
])
149 LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_name(
150 tap_get_state()), tap_state_name(cmd
->path
[i
]));
154 tap_set_state(cmd
->path
[i
]);
157 tap_set_end_state(tap_get_state());
161 static void bitq_runtest(int num_cycles
)
165 /* only do a state_move when we're not already in IDLE */
166 if (tap_get_state() != TAP_IDLE
)
167 bitq_state_move(TAP_IDLE
);
169 /* execute num_cycles */
170 for (i
= 0; i
< num_cycles
; i
++)
173 /* finish in end_state */
174 if (tap_get_state() != tap_get_end_state())
175 bitq_state_move(tap_get_end_state());
179 static void bitq_scan_field(struct scan_field
*field
, int do_pause
)
184 const uint8_t* out_ptr
;
192 if (field
->out_value
== NULL
)
194 /* just send zeros and request data from TDO */
195 for (bit_cnt
= field
->num_bits
; bit_cnt
> 1; bit_cnt
--)
196 bitq_io(0, 0, tdo_req
);
198 bitq_io(do_pause
, 0, tdo_req
);
202 /* send data, and optionally request TDO */
204 out_ptr
= field
->out_value
;
205 for (bit_cnt
= field
->num_bits
; bit_cnt
> 1; bit_cnt
--)
207 bitq_io(0, ((*out_ptr
) & out_mask
) != 0, tdo_req
);
208 if (out_mask
== 0x80)
217 bitq_io(do_pause
, ((*out_ptr
) & out_mask
) != 0, tdo_req
);
223 if (tap_get_state() == TAP_IRSHIFT
)
224 tap_set_state(TAP_IRPAUSE
);
225 else if (tap_get_state() == TAP_DRSHIFT
)
226 tap_set_state(TAP_DRPAUSE
);
231 static void bitq_scan(struct scan_command
*cmd
)
236 bitq_state_move(TAP_IRSHIFT
);
238 bitq_state_move(TAP_DRSHIFT
);
240 for (i
= 0; i
< cmd
->num_fields
- 1; i
++)
241 bitq_scan_field(&cmd
->fields
[i
], 0);
243 bitq_scan_field(&cmd
->fields
[i
], 1);
247 int bitq_execute_queue(void)
249 struct jtag_command
* cmd
= jtag_command_queue
; /* currently processed command */
251 bitq_in_state
.cmd
= jtag_command_queue
;
252 bitq_in_state
.field_idx
= 0;
253 bitq_in_state
.bit_pos
= 0;
254 bitq_in_state
.status
= ERROR_OK
;
261 #ifdef _DEBUG_JTAG_IO_
262 LOG_DEBUG("reset trst: %i srst %i", cmd
->cmd
.reset
->trst
, cmd
->cmd
.reset
->srst
);
264 if ((cmd
->cmd
.reset
->trst
== 1) || (cmd
->cmd
.reset
->srst
&& (jtag_get_reset_config() & RESET_SRST_PULLS_TRST
)))
266 tap_set_state(TAP_RESET
);
268 bitq_interface
->reset(cmd
->cmd
.reset
->trst
, cmd
->cmd
.reset
->srst
);
269 if (bitq_interface
->in_rdy())
274 #ifdef _DEBUG_JTAG_IO_
275 LOG_DEBUG("runtest %i cycles, end in %i", cmd
->cmd
.runtest
->num_cycles
, cmd
->cmd
.runtest
->end_state
);
277 bitq_end_state(cmd
->cmd
.runtest
->end_state
);
278 bitq_runtest(cmd
->cmd
.runtest
->num_cycles
);
282 #ifdef _DEBUG_JTAG_IO_
283 LOG_DEBUG("statemove end in %i", cmd
->cmd
.statemove
->end_state
);
285 bitq_end_state(cmd
->cmd
.statemove
->end_state
);
286 bitq_state_move(tap_get_end_state()); /* uncoditional TAP move */
290 #ifdef _DEBUG_JTAG_IO_
291 LOG_DEBUG("pathmove: %i states, end in %i", cmd
->cmd
.pathmove
->num_states
,
292 cmd
->cmd
.pathmove
->path
[cmd
->cmd
.pathmove
->num_states
- 1]);
294 bitq_path_move(cmd
->cmd
.pathmove
);
298 #ifdef _DEBUG_JTAG_IO_
299 LOG_DEBUG("scan end in %i", cmd
->cmd
.scan
->end_state
);
300 if (cmd
->cmd
.scan
->ir_scan
)
301 LOG_DEBUG("scan ir");
303 LOG_DEBUG("scan dr");
305 bitq_end_state(cmd
->cmd
.scan
->end_state
);
306 bitq_scan(cmd
->cmd
.scan
);
307 if (tap_get_state() != tap_get_end_state())
308 bitq_state_move(tap_get_end_state());
312 #ifdef _DEBUG_JTAG_IO_
313 LOG_DEBUG("sleep %i", cmd
->cmd
.sleep
->us
);
315 bitq_interface
->sleep(cmd
->cmd
.sleep
->us
);
316 if (bitq_interface
->in_rdy())
321 LOG_ERROR("BUG: unknown JTAG command type encountered");
328 bitq_interface
->flush();
331 if (bitq_in_state
.cmd
)
333 LOG_ERROR("missing data from bitq interface");
334 return ERROR_JTAG_QUEUE_FAILED
;
336 if (bitq_interface
->in() >= 0)
338 LOG_ERROR("extra data from bitq interface");
339 return ERROR_JTAG_QUEUE_FAILED
;
342 return bitq_in_state
.status
;
346 void bitq_cleanup(void)