1 /***************************************************************************
2 * Copyright (C) 2008 by Øyvind Harboe *
3 * oyvind.harboe@zylin.com *
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 "replacements.h"
30 /* my private tap controller state, which tracks state for calling code */
31 static tap_state_t dummy_state
= TAP_RESET
;
33 static int dummy_clock
; /* edge detector */
35 static tap_state_t
tap_state_transition(tap_state_t cur_state
, int tms
);
38 int dummy_speed(int speed
);
39 int dummy_register_commands(struct command_context_s
*cmd_ctx
);
42 static int dummy_khz(int khz
, int *jtag_speed
);
43 static int dummy_speed_div(int speed
, int *khz
);
46 /* The dummy driver is used to easily check the code path
47 * where the target is unresponsive.
49 jtag_interface_t dummy_interface
=
53 .execute_queue
= bitbang_execute_queue
,
56 .register_commands
= dummy_register_commands
,
58 .speed_div
= dummy_speed_div
,
65 void dummy_write(int tck
, int tms
, int tdi
);
66 void dummy_reset(int trst
, int srst
);
67 void dummy_led(int on
);
69 bitbang_interface_t dummy_bitbang
=
83 void dummy_write(int tck
, int tms
, int tdi
)
85 /* TAP standard: "state transitions occur on rising edge of clock" */
86 if( tck
!= dummy_clock
)
90 int old_state
= dummy_state
;
91 dummy_state
= tap_state_transition( dummy_state
, tms
);
92 if( old_state
!= dummy_state
)
93 LOG_INFO( "dummy_tap=%s", jtag_state_name(dummy_state
) );
99 void dummy_reset(int trst
, int srst
)
102 dummy_state
= TAP_RESET
;
103 LOG_DEBUG( "reset to %s", jtag_state_name(dummy_state
) );
106 static int dummy_khz(int khz
, int *jtag_speed
)
114 *jtag_speed
=64000/khz
;
119 static int dummy_speed_div(int speed
, int *khz
)
133 int dummy_speed(int speed
)
138 int dummy_register_commands(struct command_context_s
*cmd_ctx
)
145 bitbang_interface
= &dummy_bitbang
;
155 void dummy_led(int on
)
161 * Function tap_state_transition
162 * takes a current TAP state and returns the next state according to the tms value.
164 * Even though there is code to duplicate this elsewhere, we do it here a little
165 * differently just to get a second opinion, i.e. a verification, on state tracking
166 * in that other logic. Plus array lookups without index checking are no favorite thing.
167 * This is educational for developers new to TAP controllers.
169 static tap_state_t
tap_state_transition(tap_state_t cur_state
, int tms
)
171 tap_state_t new_state
;
178 new_state
= cur_state
;
183 new_state
= TAP_DRSELECT
;
186 new_state
= TAP_IRSELECT
;
190 new_state
= TAP_DREXIT1
;
194 new_state
= TAP_DRUPDATE
;
197 new_state
= TAP_DREXIT2
;
200 new_state
= TAP_RESET
;
204 new_state
= TAP_IREXIT1
;
208 new_state
= TAP_IRUPDATE
;
211 new_state
= TAP_IREXIT2
;
214 LOG_ERROR( "fatal: invalid argument cur_state=%d", cur_state
);
227 new_state
= TAP_IDLE
;
230 new_state
= TAP_DRCAPTURE
;
235 new_state
= TAP_DRSHIFT
;
239 new_state
= TAP_DRPAUSE
;
242 new_state
= TAP_IRCAPTURE
;
247 new_state
= TAP_IRSHIFT
;
251 new_state
= TAP_IRPAUSE
;
254 LOG_ERROR( "fatal: invalid argument cur_state=%d", cur_state
);
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