diff --git a/sys/arm/at91/uart_dev_at91usart.c b/sys/arm/at91/uart_dev_at91usart.c
index 9bc4dbf55b2..43655b6e6cd 100644
--- a/sys/arm/at91/uart_dev_at91usart.c
+++ b/sys/arm/at91/uart_dev_at91usart.c
@@ -219,6 +219,20 @@ at91_usart_param(struct uart_bas *bas, int baudrate, int databits,
 	return (0);
 }
 
+static void
+at91_usart_grab(struct uart_bas *bas)
+{
+
+	WR4(bas, USART_IDR, USART_CSR_RXRDY);
+}
+
+static void
+at91_usart_ungrab(struct uart_bas *bas)
+{
+
+	WR4(bas, USART_IER, USART_CSR_RXRDY);
+}
+
 static struct uart_ops at91_usart_ops = {
 	.probe = at91_usart_probe,
 	.init = at91_usart_init,
@@ -226,6 +240,8 @@ static struct uart_ops at91_usart_ops = {
 	.putc = at91_usart_putc,
 	.rxready = at91_usart_rxready,
 	.getc = at91_usart_getc,
+	.grab = at91_usart_grab,
+	.ungrab = at91_usart_ungrab,
 };
 
 static int
diff --git a/sys/dev/uart/uart_cpu.h b/sys/dev/uart/uart_cpu.h
index db64d497e59..99ced1a2c0c 100644
--- a/sys/dev/uart/uart_cpu.h
+++ b/sys/dev/uart/uart_cpu.h
@@ -43,6 +43,8 @@ struct uart_ops {
 	void (*putc)(struct uart_bas *, int);
 	int (*rxready)(struct uart_bas *);
 	int (*getc)(struct uart_bas *, struct mtx *);
+	void (*grab)(struct uart_bas *);
+	void (*ungrab)(struct uart_bas *);
 };
 
 extern bus_space_tag_t uart_bus_space_io;
@@ -135,6 +137,27 @@ uart_putc(struct uart_devinfo *di, int c)
 	uart_unlock(di->hwmtx);
 }
 
+static __inline void
+uart_grab(struct uart_devinfo *di)
+{
+
+	uart_lock(di->hwmtx);
+	if (di->ops->grab)
+		di->ops->grab(&di->bas);
+	uart_unlock(di->hwmtx);
+}
+
+static __inline void
+uart_ungrab(struct uart_devinfo *di)
+{
+
+	uart_lock(di->hwmtx);
+	if (di->ops->ungrab)
+		di->ops->ungrab(&di->bas);
+	uart_unlock(di->hwmtx);
+}
+
+
 static __inline int
 uart_rxready(struct uart_devinfo *di)
 {
diff --git a/sys/dev/uart/uart_tty.c b/sys/dev/uart/uart_tty.c
index 97ee08d253b..56f879b75a3 100644
--- a/sys/dev/uart/uart_tty.c
+++ b/sys/dev/uart/uart_tty.c
@@ -112,11 +112,15 @@ uart_cnterm(struct consdev *cp)
 static void
 uart_cngrab(struct consdev *cp)
 {
+
+	uart_grab(cp->cn_arg);
 }
 
 static void
 uart_cnungrab(struct consdev *cp)
 {
+
+	uart_ungrab(cp->cn_arg);
 }
 
 static void