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    powerpc: Cleanup udbg_16550 and add support for LPC PIO-only UARTs · 30925748
    Benjamin Herrenschmidt 提交于
    The udbg_16550 code, which we use for our early consoles and debug
    backends was fairly messy. Especially for the debug consoles, it
    would re-implement the "high level" getc/putc/poll functions for
    each access method. It also had code to configure the UART but only
    for the straight MMIO method.
    
    This changes it to instead abstract at the register accessor level,
    and have the various functions and configuration routines use these.
    
    The result is simpler and slightly smaller code, and free support
    for non-MMIO mapped PIO UARTs, which such as the ones that can be
    present on a POWER 8 LPC bus.
    Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
    30925748
legacy_serial.c 17.9 KB