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serial: move TIOCM update to a separate function 

will be used by the following patch

Signed-off-by: Anton Nefedov <anton.nefedov@virtuozzo.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <1499342940-56739-13-git-send-email-anton.nefedov@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Anton Nefedov 2017-07-06 15:08:59 +03:00 committed by Paolo Bonzini
parent af50855c25
commit 757358425e
1 changed files with 19 additions and 12 deletions
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31
hw/char/serial.c
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@ -312,6 +312,24 @@ static void serial_write_fcr(SerialState *s, uint8_t val)
}
}
static void serial_update_tiocm(SerialState *s)
{
int flags;
qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_GET_TIOCM, &flags);
flags &= ~(CHR_TIOCM_RTS | CHR_TIOCM_DTR);
if (s->mcr & UART_MCR_RTS) {
flags |= CHR_TIOCM_RTS;
}
if (s->mcr & UART_MCR_DTR) {
flags |= CHR_TIOCM_DTR;
}
qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_SET_TIOCM, &flags);
}
static void serial_ioport_write(void *opaque, hwaddr addr, uint64_t val,
unsigned size)
{
@ -426,24 +444,13 @@ static void serial_ioport_write(void *opaque, hwaddr addr, uint64_t val,
break;
case 4:
{
int flags;
int old_mcr = s->mcr;
s->mcr = val & 0x1f;
if (val & UART_MCR_LOOP)
break;
if (s->poll_msl >= 0 && old_mcr != s->mcr) {
qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_GET_TIOCM, &flags);
flags &= ~(CHR_TIOCM_RTS | CHR_TIOCM_DTR);
if (val & UART_MCR_RTS)
flags |= CHR_TIOCM_RTS;
if (val & UART_MCR_DTR)
flags |= CHR_TIOCM_DTR;
qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_SET_TIOCM, &flags);
serial_update_tiocm(s);
/* Update the modem status after a one-character-send wait-time, since there may be a response
from the device/computer at the other end of the serial line */
timer_mod(s->modem_status_poll, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->char_transmit_time);