• Peter Hung's avatar
    serial: 8250_pci: add RS485 for F81504/508/512 · fecf27a3
    Peter Hung authored
    Add RS485 control for Fintek F81504/508/512
    
    F81504/508/512 can control their RTS with H/W mode.
    PCI configuration space for each port is 0x40 + idx * 8 + 7.
    
    When it set with 0x01, it's configured with RS232 mode.
    RTS is controlled by MCR.
    
    When it set with 0x11, it's configured with RS485 mode.
    RTS is controlled by H/W, RTS low with idle & RX, high with TX.
    
    When it set with 0x31, it's configured with RS485 mode.
    RTS is controlled by H/W, RTS high with idle & RX, low with TX.
    
    We will force 0x01 on pci_fintek_setup().
    Signed-off-by: default avatarPeter Hung <hpeter+linux_kernel@gmail.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    fecf27a3
8250_pci.c 147 KB