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target/riscv: make sure target is halted when reset_halt is set 

- some MCU will need certain period of time to be halted after ndmreset
  is issued, so in deassert_reset, it needs to make sure MCU is halted
  before clearing DM_DMCONTROL_HALTREQ.

Change-Id: I6d7ef7b9b33aff65cb996968fb28cd62e3e1fb16
Signed-off-by: Ryan QIAN <jianghao.qian@hpmicro.com>
This commit is contained in:
Ryan QIAN 2025-01-27 11:38:15 +08:00
parent 88fe56828a
commit fb750ab14b
1 changed files with 29 additions and 1 deletions
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30
src/target/riscv/riscv-013.c
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@ -2924,22 +2924,50 @@ static int deassert_reset(struct target *target)
riscv_scan_set_delay(&info->learned_delays, RISCV_DELAY_BASE,
orig_base_delay);
/* Ack reset and clear DM_DMCONTROL_HALTREQ if previously set */
/* Ack reset with DM_DMCONTROL_HALTREQ for those MCUs which need a
* period of time to be halted after reset is released */
control = 0;
control = set_field(control, DM_DMCONTROL_DMACTIVE, 1);
control = set_field(control, DM_DMCONTROL_ACKHAVERESET, 1);
control = set_field(control, DM_DMCONTROL_HALTREQ, target->reset_halt ? 1 : 0);
control = set_dmcontrol_hartsel(control, info->index);
result = dm_write(target, DM_DMCONTROL, control);
if (result != ERROR_OK)
return result;
if (target->reset_halt) {
/* Wait for all harts to halt for those MCUs mentioned above */
time_t halt_start = time(NULL);
do {
result = dmstatus_read(target, &dmstatus, true);
if (result != ERROR_OK)
return result;
if (time(NULL) - halt_start > riscv_get_command_timeout_sec()) {
LOG_TARGET_ERROR(target, "Hart didn't halt after reset in %ds; "
"dmstatus=0x%x (anyhalted=%s, allhalted=%s); "
"Increase the timeout with riscv set_command_timeout_sec.",
riscv_get_command_timeout_sec(), dmstatus,
get_field(dmstatus, DM_DMSTATUS_ANYHALTED) ? "true" : "false",
get_field(dmstatus, DM_DMSTATUS_ALLHALTED) ? "true" : "false");
return ERROR_TIMEOUT_REACHED;
}
} while (!get_field(dmstatus, DM_DMSTATUS_ALLHALTED));
target->state = TARGET_HALTED;
target->debug_reason = DBG_REASON_DBGRQ;
} else {
target->state = TARGET_RUNNING;
target->debug_reason = DBG_REASON_NOTHALTED;
}
/* clear DM_DMCONTROL_HALTREQ */
control = 0;
control = set_field(control, DM_DMCONTROL_DMACTIVE, 1);
control = set_dmcontrol_hartsel(control, info->index);
result = dm_write(target, DM_DMCONTROL, control);
if (result != ERROR_OK)
return result;
info->dcsr_ebreak_is_set = dcsr_ebreak_config_equals_reset_value(target);
return ERROR_OK;
}