static void
altera_sdcard_task_io(struct altera_sdcard_softc *sc)
{
uint16_t asr;
ALTERA_SDCARD_LOCK_ASSERT(sc);
KASSERT(sc->as_currentbio != NULL, ("%s: no current I/O", __func__));
#ifdef ALTERA_SDCARD_FAST_SIM
recheck:
#endif
asr = altera_sdcard_read_asr(sc);
/*
* Check for unexpected card removal during an I/O.
*/
if (!(asr & ALTERA_SDCARD_ASR_CARDPRESENT)) {
altera_sdcard_disk_remove(sc);
if (sc->as_flags & ALTERA_SDCARD_FLAG_DETACHREQ)
sc->as_state = ALTERA_SDCARD_STATE_DETACHED;
else
sc->as_state = ALTERA_SDCARD_STATE_NOCARD;
return;
}
/*
* If the I/O isn't complete, remain in the IO state without further
* action, even if DETACHREQ is in flight.
*/
if (asr & ALTERA_SDCARD_ASR_CMDINPROGRESS)
return;
/*
* Handle various forms of I/O completion, successful and otherwise.
* The I/O layer may restart the transaction if an error occurred, in
* which case remain in the IO state and reschedule.
*/
if (!altera_sdcard_io_complete(sc, asr))
return;
/*
* Now that I/O is complete, process detach requests in preference to
* starting new I/O.
*/
if (sc->as_flags & ALTERA_SDCARD_FLAG_DETACHREQ) {
sc->as_state = ALTERA_SDCARD_STATE_DETACHED;
return;
}
/*
* Finally, either start the next I/O or transition to the IDLE state.
*/
if (bioq_first(&sc->as_bioq) != NULL) {
altera_sdcard_nextio(sc);
#ifdef ALTERA_SDCARD_FAST_SIM
goto recheck;
#endif
} else
sc->as_state = ALTERA_SDCARD_STATE_IDLE;
}
void
altera_sdcard_detach(struct altera_sdcard_softc *sc)
{
KASSERT(sc->as_taskqueue != NULL, ("%s: taskqueue not present",
__func__));
/*
* Winding down the driver on detach is a bit complex. Update the
* flags to indicate that a detach has been requested, and then wait
* for in-progress I/O to wind down before continuing.
*/
ALTERA_SDCARD_LOCK(sc);
sc->as_flags |= ALTERA_SDCARD_FLAG_DETACHREQ;
while (sc->as_state != ALTERA_SDCARD_STATE_DETACHED)
ALTERA_SDCARD_CONDVAR_WAIT(sc);
ALTERA_SDCARD_UNLOCK(sc);
/*
* Now wait for the possibly still executing taskqueue to drain. In
* principle no more events will be scheduled as we've transitioned to
* a detached state, but there might still be a request in execution.
*/
while (taskqueue_cancel_timeout(sc->as_taskqueue, &sc->as_task, NULL))
taskqueue_drain_timeout(sc->as_taskqueue, &sc->as_task);
/*
* Simulate a disk removal if one is present to deal with any pending
* or queued I/O.
*/
if (sc->as_disk != NULL)
altera_sdcard_disk_remove(sc);
KASSERT(bioq_first(&sc->as_bioq) == NULL,
("%s: non-empty bioq", __func__));
/*
* Free any remaining allocated resources.
*/
taskqueue_free(sc->as_taskqueue);
sc->as_taskqueue = NULL;
ALTERA_SDCARD_CONDVAR_DESTROY(sc);
ALTERA_SDCARD_LOCK_DESTROY(sc);
}
static void
altera_sdcard_task_idle(struct altera_sdcard_softc *sc)
{
ALTERA_SDCARD_LOCK_ASSERT(sc);
/*
* Handle device driver detach.
*/
if (sc->as_flags & ALTERA_SDCARD_FLAG_DETACHREQ) {
sc->as_state = ALTERA_SDCARD_STATE_DETACHED;
return;
}
/*
* Handle safe card removal.
*/
if (!(altera_sdcard_read_asr(sc) & ALTERA_SDCARD_ASR_CARDPRESENT)) {
altera_sdcard_disk_remove(sc);
sc->as_state = ALTERA_SDCARD_STATE_NOCARD;
}
}