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serial: a3720: Implement pending method for output direction 

To check if some output characters are waiting either in Transmitter
Holding Register or Transmitter Shift Register we need to look at
TX_EMPTY bit of UART Status Register.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Pali Rohár 2021-01-14 15:46:35 +01:00 committed by Stefan Roese
parent ba8ae03eab
commit aea2f72105
1 changed files with 8 additions and 2 deletions
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10
drivers/serial/serial_mvebu_a3700.c
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@ -23,6 +23,7 @@ struct mvebu_plat {
#define UART_POSSR_REG 0x14
#define UART_STATUS_RX_RDY 0x10
#define UART_STATUS_TX_EMPTY 0x40
#define UART_STATUS_TXFIFO_FULL 0x800
#define UART_CTRL_RXFIFO_RESET 0x4000
@ -59,8 +60,13 @@ static int mvebu_serial_pending(struct udevice *dev, bool input)
struct mvebu_plat *plat = dev_get_plat(dev);
void __iomem *base = plat->base;
if (readl(base + UART_STATUS_REG) & UART_STATUS_RX_RDY)
return 1;
if (input) {
if (readl(base + UART_STATUS_REG) & UART_STATUS_RX_RDY)
return 1;
} else {
if (!(readl(base + UART_STATUS_REG) & UART_STATUS_TX_EMPTY))
return 1;
}
return 0;
}