@@ -23,6 +23,7 @@
#define UNIPHIER_UART_TX UNIPHIER_UART_RX
/* bit[15:8] = CHAR, bit[7:0] = FCR */
#define UNIPHIER_UART_CHAR_FCR (3 << (UNIPHIER_UART_REGSHIFT))
+#define UNIPHIER_UART_FCR_MASK GENMASK(7, 0)
/* bit[15:8] = LCR, bit[7:0] = MCR */
#define UNIPHIER_UART_LCR_MCR (4 << (UNIPHIER_UART_REGSHIFT))
#define UNIPHIER_UART_LCR_MASK GENMASK(15, 8)
@@ -140,6 +141,12 @@ static int uniphier_serial_probe(struct udevice *dev)
while (!(readl(priv->membase + UNIPHIER_UART_LSR) & UART_LSR_TEMT))
;
+ /* enable FIFO */
+ tmp = readl(priv->membase + UNIPHIER_UART_CHAR_FCR);
+ tmp &= ~UNIPHIER_UART_FCR_MASK;
+ tmp |= FIELD_PREP(UNIPHIER_UART_FCR_MASK, UART_FCR_ENABLE_FIFO);
+ writel(tmp, priv->membase + UNIPHIER_UART_CHAR_FCR);
+
tmp = readl(priv->membase + UNIPHIER_UART_LCR_MCR);
tmp &= ~UNIPHIER_UART_LCR_MASK;
tmp |= FIELD_PREP(UNIPHIER_UART_LCR_MASK, UART_LCR_WLEN8);
This UART controller is integrated with a FIFO. Enable it. You can put the next character into the FIFO while the transmitter is sending out the current character. This works slightly faster. Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com> --- drivers/serial/serial_uniphier.c | 7 +++++++ 1 file changed, 7 insertions(+)