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mpfs_serial.c: Add RX flowcontrol

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Disable RX interrupts and clear the fifo in case of full RX buffer.
Enable RX interrupts in case of empty buffer.
This commit is contained in:
Jani Paalijarvi
2024-09-20 08:32:05 +03:00
committed by Alan C. Assis
parent 0d46c68731
commit 21f9fc2b28
1 changed files with 46 additions and 1 deletions
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arch/risc-v/src/mpfs/mpfs_serial.c
+46 -1
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@@ -142,6 +142,10 @@ static int up_ioctl(struct file *filep, int cmd, unsigned long arg);
static int up_receive(struct uart_dev_s *dev, unsigned int *status);
static void up_rxint(struct uart_dev_s *dev, bool enable);
static bool up_rxavailable(struct uart_dev_s *dev);
#ifdef CONFIG_SERIAL_IFLOWCONTROL
static bool up_rxflowcontrol(struct uart_dev_s *dev,
unsigned int nbuffered, bool upper);
#endif
static void up_send(struct uart_dev_s *dev, int ch);
static void up_txint(struct uart_dev_s *dev, bool enable);
static bool up_txready(struct uart_dev_s *dev);
@@ -162,7 +166,7 @@ static const struct uart_ops_s g_uart_ops =
.rxint = up_rxint,
.rxavailable = up_rxavailable,
#ifdef CONFIG_SERIAL_IFLOWCONTROL
.rxflowcontrol = NULL,
.rxflowcontrol = up_rxflowcontrol,
#endif
.send = up_send,
.txint = up_txint,
@@ -1015,6 +1019,47 @@ static bool up_rxavailable(struct uart_dev_s *dev)
return ((up_serialin(priv, MPFS_UART_LSR_OFFSET) & UART_LSR_DR) != 0);
}
#ifdef CONFIG_SERIAL_IFLOWCONTROL
/****************************************************************************
* Name: up_rxflowcontrol
*
* Description:
* Basic flowcontrol functionality.
* Disable RX interrupts and clear the fifo in case of full RX buffer.
* Enable RX interrupts in case of empty buffer.
* Return true if RX FIFO was cleared.
*
****************************************************************************/
static bool up_rxflowcontrol(struct uart_dev_s *dev,
unsigned int nbuffered, bool upper)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
bool ret = false;
if (nbuffered == 0 || upper == false)
{
/* Empty buffer. Enable RX ints */
up_rxint(dev, true);
ret = false;
}
else
{
/* Full buffer. Disable RX ints and clear the RX FIFO */
up_rxint(dev, false);
up_serialout(priv, MPFS_UART_FCR_OFFSET, UART_FCR_RFIFOR);
ret = true;
}
return ret;
}
#endif
/****************************************************************************
* Name: up_send
*