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Maximum number of blocks.

Notes/Warnings

  1. The DMA region from which data is read or written may be a limited size. The count returned by this function should be the maximum number of blocks of size blk_size that can fit into this region.
  2. If the controller is not capable of multiple block reads or writes, 1 should be returned.
  3. If the controller has no limit on the number of blocks in a multiple block read or write, DEF_INT_32U_MAX_VAL should be returned.
  4. This function should always return the same value. If hardware constraints change at run-time, the device must be closed and re-opened for any changes to be effective.