1 // SPDX-License-Identifier: GPL-2.0-or-later
3 /***************************************************************************
4 * Copyright (C) 2008 by Øyvind Harboe *
5 * oyvind.harboe@zylin.com *
6 ***************************************************************************/
12 #include <jtag/interface.h>
16 /* my private tap controller state, which tracks state for calling code */
17 static tap_state_t dummy_state
= TAP_RESET
;
19 static int dummy_clock
; /* edge detector */
21 static int clock_count
; /* count clocks in any stable state, only stable states */
23 static uint32_t dummy_data
;
25 static bb_value_t
dummy_read(void)
27 int data
= 1 & dummy_data
;
28 dummy_data
= (dummy_data
>> 1) | (1 << 31);
29 return data
? BB_HIGH
: BB_LOW
;
32 static int dummy_write(int tck
, int tms
, int tdi
)
34 /* TAP standard: "state transitions occur on rising edge of clock" */
35 if (tck
!= dummy_clock
) {
37 tap_state_t old_state
= dummy_state
;
38 dummy_state
= tap_state_transition(old_state
, tms
);
40 if (old_state
!= dummy_state
) {
42 LOG_DEBUG("dummy_tap: %d stable clocks", clock_count
);
46 LOG_DEBUG("dummy_tap: %s", tap_state_name(dummy_state
));
49 if (dummy_state
== TAP_DRCAPTURE
)
50 dummy_data
= 0x01255043;
53 /* this is a stable state clock edge, no change of state here,
54 * simply increment clock_count for subsequent logging
64 static int dummy_reset(int trst
, int srst
)
68 if (trst
|| (srst
&& (jtag_get_reset_config() & RESET_SRST_PULLS_TRST
)))
69 dummy_state
= TAP_RESET
;
71 LOG_DEBUG("reset to: %s", tap_state_name(dummy_state
));
75 static int dummy_led(int on
)
80 static struct bitbang_interface dummy_bitbang
= {
82 .write
= &dummy_write
,
86 static int dummy_khz(int khz
, int *jtag_speed
)
91 *jtag_speed
= 64000/khz
;
95 static int dummy_speed_div(int speed
, int *khz
)
105 static int dummy_speed(int speed
)
110 static int dummy_init(void)
112 bitbang_interface
= &dummy_bitbang
;
117 static int dummy_quit(void)
122 static const struct command_registration dummy_command_handlers
[] = {
126 .help
= "dummy interface driver commands",
127 .chain
= hello_command_handlers
,
130 COMMAND_REGISTRATION_DONE
,
133 /* The dummy driver is used to easily check the code path
134 * where the target is unresponsive.
136 static struct jtag_interface dummy_interface
= {
137 .supported
= DEBUG_CAP_TMS_SEQ
,
138 .execute_queue
= &bitbang_execute_queue
,
141 struct adapter_driver dummy_adapter_driver
= {
143 .transports
= jtag_only
,
144 .commands
= dummy_command_handlers
,
148 .reset
= &dummy_reset
,
149 .speed
= &dummy_speed
,
151 .speed_div
= &dummy_speed_div
,
153 .jtag_ops
= &dummy_interface
,
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