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openocd/src/jtag/drivers/bitq.c

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/***************************************************************************
* Copyright (C) 2007 by Pavel Chromy *
* chromy@asix.cz *
* *
* 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, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <jtag/jtag.h>
#include "bitq.h"
#include <jtag/interface.h>
struct bitq_interface *bitq_interface; /* low level bit queue interface */
/* state of input queue */
struct bitq_state {
struct jtag_command *cmd; /* command currently processed */
int field_idx; /* index of field currently being processed */
int bit_pos; /* position of bit currently being processed */
int status; /* processing status */
};
static struct bitq_state bitq_in_state;
/*
* input queue processing does not use jtag_read_buffer() to avoid unnecessary overhead
* no parameters, makes use of stored state information
*/
static void bitq_in_proc(void)
{
/* loop through the queue */
while (bitq_in_state.cmd) {
/* only JTAG_SCAN command may return data */
if (bitq_in_state.cmd->type == JTAG_SCAN) {
/* loop through the fields */
while (bitq_in_state.field_idx < bitq_in_state.cmd->cmd.scan->num_fields) {
struct scan_field *field;
field = &bitq_in_state.cmd->cmd.scan->fields[bitq_in_state.field_idx];
if (field->in_value) {
/* field scanning */
while (bitq_in_state.bit_pos < field->num_bits) {
/* index of byte being scanned */
int in_idx = bitq_in_state.bit_pos / 8;
/* mask of next bit to be scanned */
uint8_t in_mask = 1 << (bitq_in_state.bit_pos % 8);
int tdo = bitq_interface->in();
if (tdo < 0) {
#ifdef _DEBUG_JTAG_IO_
LOG_DEBUG("bitq in EOF");
#endif
return;
}
if (in_mask == 0x01)
field->in_value[in_idx] = 0;
if (tdo)
field->in_value[in_idx] |= in_mask;
bitq_in_state.bit_pos++;
}
}
bitq_in_state.field_idx++; /* advance to next field */
bitq_in_state.bit_pos = 0; /* start next field from the first bit */
}
}
bitq_in_state.cmd = bitq_in_state.cmd->next; /* advance to next command */
bitq_in_state.field_idx = 0; /* preselect first field */
}
}
static void bitq_io(int tms, int tdi, int tdo_req)
{
bitq_interface->out(tms, tdi, tdo_req);
/* check and process the input queue */
if (bitq_interface->in_rdy())
bitq_in_proc();
}
static void bitq_end_state(tap_state_t state)
{
if (!tap_is_state_stable(state)) {
LOG_ERROR("BUG: %i is not a valid end state", state);
exit(-1);
}
tap_set_end_state(state);
}
static void bitq_state_move(tap_state_t new_state)
{
int i = 0;
uint8_t tms_scan;
if (!tap_is_state_stable(tap_get_state()) || !tap_is_state_stable(new_state)) {
LOG_ERROR("TAP move from or to unstable state");
exit(-1);
}
tms_scan = tap_get_tms_path(tap_get_state(), new_state);
int tms_count = tap_get_tms_path_len(tap_get_state(), new_state);
for (i = 0; i < tms_count; i++) {
bitq_io(tms_scan & 1, 0, 0);
tms_scan >>= 1;
}
tap_set_state(new_state);
}
static void bitq_path_move(struct pathmove_command *cmd)
{
int i;
for (i = 0; i <= cmd->num_states; i++) {
if (tap_state_transition(tap_get_state(), false) == cmd->path[i])
bitq_io(0, 0, 0);
else if (tap_state_transition(tap_get_state(), true) == cmd->path[i])
bitq_io(1, 0, 0);
else {
LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_name(
tap_get_state()), tap_state_name(cmd->path[i]));
exit(-1);
}
tap_set_state(cmd->path[i]);
}
tap_set_end_state(tap_get_state());
}
static void bitq_runtest(int num_cycles)
{
int i;
/* only do a state_move when we're not already in IDLE */
if (tap_get_state() != TAP_IDLE)
bitq_state_move(TAP_IDLE);
/* execute num_cycles */
for (i = 0; i < num_cycles; i++)
bitq_io(0, 0, 0);
/* finish in end_state */
if (tap_get_state() != tap_get_end_state())
bitq_state_move(tap_get_end_state());
}
static void bitq_scan_field(struct scan_field *field, int do_pause)
{
int bit_cnt;
int tdo_req;
const uint8_t *out_ptr;
uint8_t out_mask;
if (field->in_value)
tdo_req = 1;
else
tdo_req = 0;
if (field->out_value == NULL) {
/* just send zeros and request data from TDO */
for (bit_cnt = field->num_bits; bit_cnt > 1; bit_cnt--)
bitq_io(0, 0, tdo_req);
bitq_io(do_pause, 0, tdo_req);
} else {
/* send data, and optionally request TDO */
out_mask = 0x01;
out_ptr = field->out_value;
for (bit_cnt = field->num_bits; bit_cnt > 1; bit_cnt--) {
bitq_io(0, ((*out_ptr) & out_mask) != 0, tdo_req);
if (out_mask == 0x80) {
out_mask = 0x01;
out_ptr++;
} else
out_mask <<= 1;
}
bitq_io(do_pause, ((*out_ptr) & out_mask) != 0, tdo_req);
}
if (do_pause) {
bitq_io(0, 0, 0);
if (tap_get_state() == TAP_IRSHIFT)
tap_set_state(TAP_IRPAUSE);
else if (tap_get_state() == TAP_DRSHIFT)
tap_set_state(TAP_DRPAUSE);
}
}
static void bitq_scan(struct scan_command *cmd)
{
int i;
if (cmd->ir_scan)
bitq_state_move(TAP_IRSHIFT);
else
bitq_state_move(TAP_DRSHIFT);
for (i = 0; i < cmd->num_fields - 1; i++)
bitq_scan_field(&cmd->fields[i], 0);
bitq_scan_field(&cmd->fields[i], 1);
}
int bitq_execute_queue(void)
{
struct jtag_command *cmd = jtag_command_queue; /* currently processed command */
bitq_in_state.cmd = jtag_command_queue;
bitq_in_state.field_idx = 0;
bitq_in_state.bit_pos = 0;
bitq_in_state.status = ERROR_OK;
while (cmd) {
switch (cmd->type) {
case JTAG_RESET:
#ifdef _DEBUG_JTAG_IO_
LOG_DEBUG("reset trst: %i srst %i", cmd->cmd.reset->trst, cmd->cmd.reset->srst);
#endif
if ((cmd->cmd.reset->trst == 1) ||
(cmd->cmd.reset->srst &&
(jtag_get_reset_config() & RESET_SRST_PULLS_TRST)))
tap_set_state(TAP_RESET);
bitq_interface->reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
if (bitq_interface->in_rdy())
bitq_in_proc();
break;
case JTAG_RUNTEST:
#ifdef _DEBUG_JTAG_IO_
LOG_DEBUG("runtest %i cycles, end in %i", cmd->cmd.runtest->num_cycles, cmd->cmd.runtest->end_state);
#endif
bitq_end_state(cmd->cmd.runtest->end_state);
bitq_runtest(cmd->cmd.runtest->num_cycles);
break;
case JTAG_TLR_RESET:
#ifdef _DEBUG_JTAG_IO_
LOG_DEBUG("statemove end in %i", cmd->cmd.statemove->end_state);
#endif
bitq_end_state(cmd->cmd.statemove->end_state);
bitq_state_move(tap_get_end_state()); /* uncoditional TAP move */
break;
case JTAG_PATHMOVE:
#ifdef _DEBUG_JTAG_IO_
LOG_DEBUG("pathmove: %i states, end in %i", cmd->cmd.pathmove->num_states,
cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]);
#endif
bitq_path_move(cmd->cmd.pathmove);
break;
case JTAG_SCAN:
#ifdef _DEBUG_JTAG_IO_
LOG_DEBUG("scan end in %i", cmd->cmd.scan->end_state);
if (cmd->cmd.scan->ir_scan)
LOG_DEBUG("scan ir");
else
LOG_DEBUG("scan dr");
#endif
bitq_end_state(cmd->cmd.scan->end_state);
bitq_scan(cmd->cmd.scan);
if (tap_get_state() != tap_get_end_state())
bitq_state_move(tap_get_end_state());
break;
case JTAG_SLEEP:
#ifdef _DEBUG_JTAG_IO_
LOG_DEBUG("sleep %i", cmd->cmd.sleep->us);
#endif
bitq_interface->sleep(cmd->cmd.sleep->us);
if (bitq_interface->in_rdy())
bitq_in_proc();
break;
default:
LOG_ERROR("BUG: unknown JTAG command type encountered");
exit(-1);
}
cmd = cmd->next;
}
bitq_interface->flush();
bitq_in_proc();
if (bitq_in_state.cmd) {
LOG_ERROR("missing data from bitq interface");
return ERROR_JTAG_QUEUE_FAILED;
}
if (bitq_interface->in() >= 0) {
LOG_ERROR("extra data from bitq interface");
return ERROR_JTAG_QUEUE_FAILED;
}
return bitq_in_state.status;
}
void bitq_cleanup(void)
{
}
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