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serial: 8250_mxpcie: add custom handle_irq callback

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Add a mxpcie-specific handle_irq() implementation for Moxa PCIe serial
ports.

This keeps the interrupt handling self-contained in the driver and
provides a hook point for MUEx50-specific RX/TX paths added in subsequent
patches. The handler processes RX, updates modem status, and handles TX
when THRE is asserted.

Signed-off-by: Crescent Hsieh <crescentcy.hsieh@moxa.com>
Link: https://patch.msgid.link/20260731074820.735619-7-crescentcy.hsieh@moxa.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Crescent Hsieh 2026-07-31 15:48:12 +08:00 committed by Greg Kroah-Hartman
parent d98cf22e68
commit e8224757c6
1 changed files with 42 additions and 0 deletions
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42
drivers/tty/serial/8250/8250_mxpcie.c
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@ -263,6 +263,47 @@ static void mxpcie8250_unthrottle(struct uart_port *port)
serial_out(up, UART_IER, up->ier);
}
static bool mxpcie8250_should_rx(struct uart_8250_port *up, u16 lsr)
{
struct uart_port *port = &up->port;
if (!(lsr & (UART_LSR_DR | UART_LSR_BI)))
return false;
if (!(port->status & (UPSTAT_AUTOCTS | UPSTAT_AUTORTS)))
return true;
if (lsr & (UART_LSR_FIFOE | UART_LSR_BRK_ERROR_BITS))
return true;
if (port->read_status_mask & UART_LSR_DR)
return true;
return false;
}
static int mxpcie8250_handle_irq(struct uart_port *port)
{
struct uart_8250_port *up = up_to_u8250p(port);
u16 lsr;
u8 iir;
iir = serial_in(up, UART_IIR);
if (iir & UART_IIR_NO_INT)
return 0;
guard(uart_port_lock_check_sysrq_irqsave)(port);
lsr = serial_lsr_in(up);
if (mxpcie8250_should_rx(up, lsr))
lsr = serial8250_rx_chars(up, lsr);
serial8250_modem_status(up);
if ((lsr & UART_LSR_THRE) && (up->ier & UART_IER_THRI))
serial8250_tx_chars(up);
return 1;
}
static void mxpcie8250_init_board(struct pci_dev *pdev, struct mxpcie8250 *priv)
{
void __iomem *bar2_base = priv->bar2_base;
@ -362,6 +403,7 @@ static int mxpcie8250_probe(struct pci_dev *pdev, const struct pci_device_id *id
up.port.shutdown = mxpcie8250_shutdown;
up.port.throttle = mxpcie8250_throttle;
up.port.unthrottle = mxpcie8250_unthrottle;
up.port.handle_irq = mxpcie8250_handle_irq;
for (unsigned int i = 0; i < num_ports; i++) {
mxpcie8250_setup_port(pdev, priv, &up, i);