static void
aju_ac_callout(void *arg)
{
struct altera_jtag_uart_softc *sc = arg;
struct tty *tp = sc->ajus_ttyp;
uint32_t v;
tty_lock(tp);
AJU_LOCK(sc);
v = aju_control_read(sc);
if (v & ALTERA_JTAG_UART_CONTROL_AC) {
v &= ~ALTERA_JTAG_UART_CONTROL_AC;
aju_control_write(sc, v);
if (*sc->ajus_jtag_presentp == 0) {
*sc->ajus_jtag_missedp = 0;
*sc->ajus_jtag_presentp = 1;
aju_handle_output(sc, tp);
}
} else if (*sc->ajus_jtag_presentp != 0) {
(*sc->ajus_jtag_missedp)++;
if (*sc->ajus_jtag_missedp >= AJU_JTAG_MAXMISS) {
*sc->ajus_jtag_presentp = 0;
aju_handle_output(sc, tp);
}
}
callout_reset(&sc->ajus_ac_callout, AJU_AC_POLLINTERVAL,
aju_ac_callout, sc);
AJU_UNLOCK(sc);
tty_unlock(tp);
}
static void
aju_intr_disable(struct altera_jtag_uart_softc *sc)
{
uint32_t v;
AJU_LOCK_ASSERT(sc);
v = aju_control_read(sc);
v &= ~(ALTERA_JTAG_UART_CONTROL_RE | ALTERA_JTAG_UART_CONTROL_WE);
aju_control_write(sc, v);
}
static void
aju_intr_writable_disable(struct altera_jtag_uart_softc *sc)
{
uint32_t v;
AJU_LOCK_ASSERT(sc);
atomic_add_int(&aju_intr_writable_disabled, 1);
v = aju_control_read(sc);
v &= ~ALTERA_JTAG_UART_CONTROL_WE;
aju_control_write(sc, v);
}
static void
aju_ac_callout(void *arg)
{
struct altera_jtag_uart_softc *sc = arg;
struct tty *tp = sc->ajus_ttyp;
uint32_t v;
tty_lock(tp);
AJU_LOCK(sc);
v = aju_control_read(sc);
if (v & ALTERA_JTAG_UART_CONTROL_AC) {
v &= ~ALTERA_JTAG_UART_CONTROL_AC;
aju_control_write(sc, v);
if (*sc->ajus_jtag_presentp == 0) {
*sc->ajus_jtag_presentp = 1;
atomic_add_int(&aju_jtag_appeared, 1);
aju_handle_output(sc, tp);
}
/* Any hit eliminates all recent misses. */
*sc->ajus_jtag_missedp = 0;
} else if (*sc->ajus_jtag_presentp != 0) {
/*
* If we've exceeded our tolerance for misses, mark JTAG as
* disconnected and drain output. Otherwise, bump the miss
* counter.
*/
if (*sc->ajus_jtag_missedp > AJU_JTAG_MAXMISS) {
*sc->ajus_jtag_presentp = 0;
atomic_add_int(&aju_jtag_vanished, 1);
aju_handle_output(sc, tp);
} else
(*sc->ajus_jtag_missedp)++;
}
callout_reset(&sc->ajus_ac_callout, AJU_AC_POLLINTERVAL,
aju_ac_callout, sc);
AJU_UNLOCK(sc);
tty_unlock(tp);
}