• Tiezhu Yang's avatar
    MIPS: Loongson: Add DMA support for LS7A · 68fbb972
    Tiezhu Yang authored
    In the current market, the most used bridge chip on the Loongson platform
    are RS780E and LS7A, the RS780E bridge chip is already supported by the
    mainline kernel.
    
    If use the default implementation of __phys_to_dma() and __dma_to_phys()
    in dma-direct.h when CONFIG_ARCH_HAS_PHYS_TO_DMA is not set, it works
    well used with LS7A on the Loongson single-way and multi-way platform,
    and also works well used with RS780E on the Loongson single-way platform,
    but the DMA address will be wrong on the non-node0 used with RS780E on
    the Loongson multi-way platform.
    
    Just as the description in the code comment, the devices get node id from
    40 bit of HyperTransport bus, so we extract 2 bit node id (bit 44~45) from
    48 bit address space of Loongson CPU and embed it into HyperTransport bus
    (bit 37-38), this operation can be done only at the software level used
    with RS780E on the Loongson multi-way platform, because it has no hardware
    function to translate address of node id, this is a hardware compatibility
    problem.
    
    Device
        |
        | DMA address
        |
    Host Bridge
        |
        | HT bus address (40 bit)
        |
       CPU
        |
        | physical address (48 bit)
        |
       RAM
    
    The LS7A has dma_node_id_offset field in the DMA route config register,
    the hardware can use the dma_node_id_offset to translate address of
    node id automatically, so we can get correct address when just use the
    dma_pfn_offset field in struct device.
    
    For the above reasons, in order to maintain downward compatibility
    to support the RS780E bridge chip, it is better to use the platform
    dependent implementation of __phys_to_dma() and __dma_to_phys().
    Signed-off-by: default avatarTiezhu Yang <yangtiezhu@loongson.cn>
    Signed-off-by: default avatarThomas Bogendoerfer <tsbogend@alpha.franken.de>
    68fbb972
env.c 6.84 KB