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- /***************************************************************************
- * Copyright (C) 2008 by Øyvind Harboe *
- * oyvind.harboe@zylin.com *
- * *
- * This program is free software; you can redistribute it and/or modify *
- * it under the terms of the GNU General Public License as published by *
- * the Free Software Foundation; either version 2 of the License, or *
- * (at your option) any later version. *
- * *
- * This program is distributed in the hope that it will be useful, *
- * but WITHOUT ANY WARRANTY; without even the implied warranty of *
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
- * GNU General Public License for more details. *
- * *
- * You should have received a copy of the GNU General Public License *
- * along with this program. If not, see <http://www.gnu.org/licenses/>. *
- ***************************************************************************/
-
- #ifdef HAVE_CONFIG_H
- #include "config.h"
- #endif
-
- #include <jtag/interface.h>
- #include "bitbang.h"
- #include "hello.h"
-
- /* my private tap controller state, which tracks state for calling code */
- static tap_state_t dummy_state = TAP_RESET;
-
- static int dummy_clock; /* edge detector */
-
- static int clock_count; /* count clocks in any stable state, only stable states */
-
- static uint32_t dummy_data;
-
- static bb_value_t dummy_read(void)
- {
- int data = 1 & dummy_data;
- dummy_data = (dummy_data >> 1) | (1 << 31);
- return data ? BB_HIGH : BB_LOW;
- }
-
- static int dummy_write(int tck, int tms, int tdi)
- {
- /* TAP standard: "state transitions occur on rising edge of clock" */
- if (tck != dummy_clock) {
- if (tck) {
- tap_state_t old_state = dummy_state;
- dummy_state = tap_state_transition(old_state, tms);
-
- if (old_state != dummy_state) {
- if (clock_count) {
- LOG_DEBUG("dummy_tap: %d stable clocks", clock_count);
- clock_count = 0;
- }
-
- LOG_DEBUG("dummy_tap: %s", tap_state_name(dummy_state));
-
- #if defined(DEBUG)
- if (dummy_state == TAP_DRCAPTURE)
- dummy_data = 0x01255043;
- #endif
- } else {
- /* this is a stable state clock edge, no change of state here,
- * simply increment clock_count for subsequent logging
- */
- ++clock_count;
- }
- }
- dummy_clock = tck;
- }
- return ERROR_OK;
- }
-
- static int dummy_reset(int trst, int srst)
- {
- dummy_clock = 0;
-
- if (trst || (srst && (jtag_get_reset_config() & RESET_SRST_PULLS_TRST)))
- dummy_state = TAP_RESET;
-
- LOG_DEBUG("reset to: %s", tap_state_name(dummy_state));
- return ERROR_OK;
- }
-
- static int dummy_led(int on)
- {
- return ERROR_OK;
- }
-
- static struct bitbang_interface dummy_bitbang = {
- .read = &dummy_read,
- .write = &dummy_write,
- .blink = &dummy_led,
- };
-
- static int dummy_khz(int khz, int *jtag_speed)
- {
- if (khz == 0)
- *jtag_speed = 0;
- else
- *jtag_speed = 64000/khz;
- return ERROR_OK;
- }
-
- static int dummy_speed_div(int speed, int *khz)
- {
- if (speed == 0)
- *khz = 0;
- else
- *khz = 64000/speed;
-
- return ERROR_OK;
- }
-
- static int dummy_speed(int speed)
- {
- return ERROR_OK;
- }
-
- static int dummy_init(void)
- {
- bitbang_interface = &dummy_bitbang;
-
- return ERROR_OK;
- }
-
- static int dummy_quit(void)
- {
- return ERROR_OK;
- }
-
- static const struct command_registration dummy_command_handlers[] = {
- {
- .name = "dummy",
- .mode = COMMAND_ANY,
- .help = "dummy interface driver commands",
- .chain = hello_command_handlers,
- .usage = "",
- },
- COMMAND_REGISTRATION_DONE,
- };
-
- /* The dummy driver is used to easily check the code path
- * where the target is unresponsive.
- */
- static struct jtag_interface dummy_interface = {
- .supported = DEBUG_CAP_TMS_SEQ,
- .execute_queue = &bitbang_execute_queue,
- };
-
- struct adapter_driver dummy_adapter_driver = {
- .name = "dummy",
- .transports = jtag_only,
- .commands = dummy_command_handlers,
-
- .init = &dummy_init,
- .quit = &dummy_quit,
- .reset = &dummy_reset,
- .speed = &dummy_speed,
- .khz = &dummy_khz,
- .speed_div = &dummy_speed_div,
-
- .jtag_ops = &dummy_interface,
- };
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