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 #define INCLUDE_JTAG_INTERFACE_H
25 #include "interface.h"
29 /* my private tap controller state, which tracks state for calling code */
30 static tap_state_t dummy_state
= TAP_RESET
;
32 static int dummy_clock
; /* edge detector */
34 static int clock_count
; /* count clocks in any stable state, only stable states */
36 static u32 dummy_data
;
39 static int dummy_speed(int speed
);
40 static int dummy_register_commands(struct command_context_s
*cmd_ctx
);
41 static int dummy_init(void);
42 static int dummy_quit(void);
43 static int dummy_khz(int khz
, int *jtag_speed
);
44 static int dummy_speed_div(int speed
, int *khz
);
47 /* The dummy driver is used to easily check the code path
48 * where the target is unresponsive.
50 jtag_interface_t dummy_interface
=
54 .execute_queue
= bitbang_execute_queue
,
57 .register_commands
= dummy_register_commands
,
59 .speed_div
= dummy_speed_div
,
65 static int dummy_read(void);
66 static void dummy_write(int tck
, int tms
, int tdi
);
67 static void dummy_reset(int trst
, int srst
);
68 static void dummy_led(int on
);
70 static bitbang_interface_t dummy_bitbang
=
78 static int dummy_read(void)
80 int data
= 1 & dummy_data
;
81 dummy_data
= (dummy_data
>> 1) | (1<<31);
86 static void dummy_write(int tck
, int tms
, int tdi
)
88 /* TAP standard: "state transitions occur on rising edge of clock" */
89 if( tck
!= dummy_clock
)
93 tap_state_t old_state
= dummy_state
;
94 dummy_state
= tap_state_transition( old_state
, tms
);
96 if( old_state
!= dummy_state
)
100 LOG_DEBUG("dummy_tap: %d stable clocks", clock_count
);
104 LOG_DEBUG("dummy_tap: %s", tap_state_name(dummy_state
) );
107 if(dummy_state
== TAP_DRCAPTURE
)
108 dummy_data
= 0x01255043;
113 /* this is a stable state clock edge, no change of state here,
114 * simply increment clock_count for subsequent logging
123 static void dummy_reset(int trst
, int srst
)
127 if (trst
|| (srst
&& (jtag_reset_config
& RESET_SRST_PULLS_TRST
)))
128 dummy_state
= TAP_RESET
;
130 LOG_DEBUG("reset to: %s", tap_state_name(dummy_state
) );
133 static int dummy_khz(int khz
, int *jtag_speed
)
141 *jtag_speed
=64000/khz
;
146 static int dummy_speed_div(int speed
, int *khz
)
160 static int dummy_speed(int speed
)
165 static int dummy_register_commands(struct command_context_s
*cmd_ctx
)
170 static int dummy_init(void)
172 bitbang_interface
= &dummy_bitbang
;
177 static int dummy_quit(void)
182 static void dummy_led(int on
)
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