This patch adds codes to enable FIFO and disable flow control taken from ns16550 driver.
Signed-off-by: Weijie Gao weijie.gao@mediatek.com --- drivers/serial/serial_mtk.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
diff --git a/drivers/serial/serial_mtk.c b/drivers/serial/serial_mtk.c index bce1be8227..11892a8740 100644 --- a/drivers/serial/serial_mtk.c +++ b/drivers/serial/serial_mtk.c @@ -46,6 +46,22 @@ struct mtk_serial_regs {
#define UART_LSR_DR 0x01 /* Data ready */ #define UART_LSR_THRE 0x20 /* Xmit holding register empty */ +#define UART_LSR_TEMT 0x40 /* Xmitter empty */ + +#define UART_MCR_DTR 0x01 /* DTR */ +#define UART_MCR_RTS 0x02 /* RTS */ + +#define UART_FCR_FIFO_EN 0x01 /* Fifo enable */ +#define UART_FCR_RXSR 0x02 /* Receiver soft reset */ +#define UART_FCR_TXSR 0x04 /* Transmitter soft reset */ + +#define UART_MCRVAL (UART_MCR_DTR | \ + UART_MCR_RTS) + +/* Clear & enable FIFOs */ +#define UART_FCRVAL (UART_FCR_FIFO_EN | \ + UART_FCR_RXSR | \ + UART_FCR_TXSR)
/* the data is correct if the real baud is within 3%. */ #define BAUD_ALLOW_MAX(baud) ((baud) + (baud) * 3 / 100) @@ -175,6 +191,9 @@ static int mtk_serial_probe(struct udevice *dev) /* Disable interrupt */ writel(0, &priv->regs->ier);
+ writel(UART_MCRVAL, &priv->regs->mcr); + writel(UART_FCRVAL, &priv->regs->fcr); + return 0; }
@@ -248,6 +267,8 @@ static inline void _debug_uart_init(void) priv.clock = CONFIG_DEBUG_UART_CLOCK;
writel(0, &priv.regs->ier); + writel(UART_MCRVAL, &priv.regs->mcr); + writel(UART_FCRVAL, &priv.regs->fcr);
_mtk_serial_setbrg(&priv, CONFIG_BAUDRATE); }