diff options
Diffstat (limited to 'sys/dev/uart/uart_dev_pl011.c')
| -rw-r--r-- | sys/dev/uart/uart_dev_pl011.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sys/dev/uart/uart_dev_pl011.c b/sys/dev/uart/uart_dev_pl011.c index 3253cd1..2e5ac8c 100644 --- a/sys/dev/uart/uart_dev_pl011.c +++ b/sys/dev/uart/uart_dev_pl011.c @@ -48,6 +48,7 @@ __FBSDID("$FreeBSD$"); #define DR_OE (1 << 11) /* Overrun error */ #define UART_FR 0x06 /* Flag register */ +#define FR_TXFF (1 << 5) /* Transmit FIFO/reg full */ #define FR_RXFF (1 << 6) /* Receive FIFO/reg full */ #define FR_TXFE (1 << 7) /* Transmit FIFO/reg empty */ @@ -194,7 +195,8 @@ static void uart_pl011_putc(struct uart_bas *bas, int c) { - while (!(__uart_getreg(bas, UART_FR) & FR_TXFE)) + /* Wait when TX FIFO full. Push character otherwise. */ + while (__uart_getreg(bas, UART_FR) & FR_TXFF) ; __uart_setreg(bas, UART_DR, c & 0xff); } |
