• Peter Ujfalusi's avatar
    dmaengine: ti: New driver for K3 UDMA · 25dcb5dd
    Peter Ujfalusi authored
    Split patch for review containing: defines, structs, io and low level
    functions and interrupt callbacks.
    
    DMA driver for
    Texas Instruments K3 NAVSS Unified DMA – Peripheral Root Complex (UDMA-P)
    
    The UDMA-P is intended to perform similar (but significantly upgraded) functions
    as the packet-oriented DMA used on previous SoC devices. The UDMA-P module
    supports the transmission and reception of various packet types. The UDMA-P is
    architected to facilitate the segmentation and reassembly of SoC DMA data
    structure compliant packets to/from smaller data blocks that are natively
    compatible with the specific requirements of each connected peripheral. Multiple
    Tx and Rx channels are provided within the DMA which allow multiple segmentation
    or reassembly operations to be ongoing. The DMA controller maintains state
    information for each of the channels which allows packet segmentation and
    reassembly operations to be time division multiplexed between channels in order
    to share the underlying DMA hardware. An external DMA scheduler is used to
    control the ordering and rate at which this multiplexing occurs for Transmit
    operations. The ordering and rate of Receive operations is indirectly controlled
    by the order in which blocks are pushed into the DMA on the Rx PSI-L interface.
    
    The UDMA-P also supports acting as both a UTC and UDMA-C for its internal
    channels. Channels in the UDMA-P can be configured to be either Packet-Based or
    Third-Party channels on a channel by channel basis.
    
    The initial driver supports:
    - MEM_TO_MEM (TR mode)
    - DEV_TO_MEM (Packet / TR mode)
    - MEM_TO_DEV (Packet / TR mode)
    - Cyclic (Packet / TR mode)
    - Metadata for descriptors
    Signed-off-by: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
    Tested-by: default avatarKeerthy <j-keerthy@ti.com>
    Reviewed-by: default avatarGrygorii Strashko <grygorii.strashko@ti.com>
    Link: https://lore.kernel.org/r/20191223110458.30766-11-peter.ujfalusi@ti.comSigned-off-by: default avatarVinod Koul <vkoul@kernel.org>
    25dcb5dd
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