hw/char/pl011: add support for sending break

Break events are currently only handled by chardev/char-serial.c, so we
just ignore errors, which results in no behaviour change for other
chardevs.

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
Message-id: 20210806144700.3751979-1-jlu@pengutronix.de
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/hw/char/pl011.c b/hw/char/pl011.c
index dc85527a5f..6e2d7f7509 100644
--- a/hw/char/pl011.c
+++ b/hw/char/pl011.c
@@ -26,6 +26,7 @@
 #include "hw/qdev-properties-system.h"
 #include "migration/vmstate.h"
 #include "chardev/char-fe.h"
+#include "chardev/char-serial.h"
 #include "qemu/log.h"
 #include "qemu/module.h"
 #include "trace.h"
@@ -231,6 +232,11 @@ static void pl011_write(void *opaque, hwaddr offset,
             s->read_count = 0;
             s->read_pos = 0;
         }
+        if ((s->lcr ^ value) & 0x1) {
+            int break_enable = value & 0x1;
+            qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_SET_BREAK,
+                              &break_enable);
+        }
         s->lcr = value;
         pl011_set_read_trigger(s);
         break;