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ULINK driver: Implement JTAG_STABLECLOCKS command

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Signed-off-by: Martin Schmölzer <martin.schmoelzer@student.tuwien.ac.at>
This commit is contained in:
Martin Schmölzer 2011-07-04 12:29:02 +02:00 committed by Øyvind Harboe
parent b6e4d26695
commit 118a9a9ca0
1 changed files with 54 additions and 0 deletions
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54
src/jtag/drivers/ulink.c
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@ -211,6 +211,7 @@ int ulink_queue_runtest(struct ulink *device, struct jtag_command *cmd);
int ulink_queue_reset(struct ulink *device, struct jtag_command *cmd);
int ulink_queue_pathmove(struct ulink *device, struct jtag_command *cmd);
int ulink_queue_sleep(struct ulink *device, struct jtag_command *cmd);
int ulink_queue_stableclocks(struct ulink *device, struct jtag_command *cmd);
int ulink_post_process_scan(ulink_cmd_t *ulink_cmd);
int ulink_post_process_queue(struct ulink *device);
@ -1551,6 +1552,55 @@ int ulink_queue_sleep(struct ulink *device, struct jtag_command *cmd)
return ulink_append_sleep_cmd(device, cmd->cmd.sleep->us);
}
/**
* Generate TCK cycles while remaining in a stable state.
*
* @param device pointer to struct ulink identifying ULINK driver instance.
* @param cmd pointer to the command that shall be executed.
*/
int ulink_queue_stableclocks(struct ulink *device, struct jtag_command *cmd)
{
int ret;
unsigned num_cycles;
if (!tap_is_state_stable(tap_get_state())) {
LOG_ERROR("JTAG_STABLECLOCKS: state not stable");
return ERROR_FAIL;
}
num_cycles = cmd->cmd.stableclocks->num_cycles;
/* TMS stays either high (Test Logic Reset state) or low (all other states) */
if (tap_get_state() == TAP_RESET) {
ret = ulink_append_set_signals_cmd(device, 0, SIGNAL_TMS);
}
else {
ret = ulink_append_set_signals_cmd(device, SIGNAL_TMS, 0);
}
if (ret != ERROR_OK) {
return ret;
}
while (num_cycles > 0) {
if (num_cycles > 0xFFFF) {
/* OpenULINK CMD_CLOCK_TCK can generate up to 0xFFFF (uint16_t) cycles */
ret = ulink_append_clock_tck_cmd(device, 0xFFFF);
num_cycles -= 0xFFFF;
}
else {
ret = ulink_append_clock_tck_cmd(device, num_cycles);
num_cycles = 0;
}
if (ret != ERROR_OK) {
return ret;
}
}
return ERROR_OK;
}
/**
* Post-process JTAG_SCAN command
*
@ -1612,6 +1662,7 @@ int ulink_post_process_queue(struct ulink *device)
case JTAG_RESET:
case JTAG_PATHMOVE:
case JTAG_SLEEP:
case JTAG_STABLECLOCKS:
/* Nothing to do for these commands */
ret = ERROR_OK;
break;
@ -1672,6 +1723,9 @@ static int ulink_execute_queue(void)
case JTAG_SLEEP:
ret = ulink_queue_sleep(ulink_handle, cmd);
break;
case JTAG_STABLECLOCKS:
ret = ulink_queue_stableclocks(ulink_handle, cmd);
break;
default:
ret = ERROR_FAIL;
LOG_ERROR("BUG: encountered unknown JTAG command type");