• Giuseppe Cavallaro's avatar
    stmmac: rework DMA bus setting and introduce new platform AXI structure · afea0365
    Giuseppe Cavallaro authored
    This patch restructures the DMA bus settings and this is done
    by introducing a new platform structure used for programming
    the AXI Bus Mode Register inside the DMA module.
    This structure can be populated from device-tree as documented in the
    binding txt file.
    
    After initializing the DMA, the AXI register can be optionally tuned
    for platform drivers based.
    This patch also reworks some parameters to make coherent the DMA
    configuration now that AXI register is introduced.
    For example, the burst_len is managed by using the mentioned axi
    support above; so the snps,burst-len parameter has been removed.
    It makes sense to provide the AAL parameter from DT to Address-Aligned
    Beats inside the Register0 and review the PBL settings when initialize
    the engine.
    
    For PCI glue, rebuilding the story of this setting, it
    was added to align a configuration so not for fixing some
    known problem. No issue raised after this patch.
    It is safe to use the default burst length instead of
    tuning it to the maximum value
    Signed-off-by: default avatarGiuseppe Cavallaro <peppe.cavallaro@st.com>
    Signed-off-by: default avatarAlexandre TORGUE <alexandre.torgue@st.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    afea0365
dwmac100_dma.c 4.19 KB