About the interrupt handling

Dear all,

Recently, I am developing a driver for a PCI-based multiserial
cards(9054+16c554+CPLD). The PCI bus has allocated the interrupt(IRQ 20) for
9054. However,There are no independent serial ports' interrupt line connect
to the PCI bus. (The serial ports are just enumerated from my own bus driver,
and I set the I/O space for them, all there interrupt lines are connected to
9054).

Is there some way I can notify the serial ports driver to begin RX/TX in
my bus driver interrupt handler?

Any ideas or suggestions are welcome!

Best regards,
K7C