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34b664a20e
Update functions for PIO pushing and pulling data to and from the FIFO so that they can handle unaligned output buffers and unaligned buffer lengths. This makes more of the tests in mmc_test pass. Unaligned lengths in pulls are handled by reading the full FIFO item, and storing the remaining bytes in a small internal buffer (part_buf). The next data pull will copy data out of this buffer first before accessing the FIFO again. Similarly, for pushes the final bytes that don't fill a FIFO item are stored in the part_buf (or sent anyway if it's the last transfer), and then the part_buf is included at the beginning of the next buffer pushed. Unaligned buffers in pulls are handled specially if the architecture cannot do efficient unaligned accesses, by reading FIFO items into a aligned local buffer, and memcpy'ing them into the output buffer, again storing any remaining bytes in the internal buffer. Similarly for pushes the buffer is memcpy'd into an aligned local buffer then written to the FIFO. Signed-off-by: James Hogan <james.hogan@imgtec.com> Acked-by: Will Newton <will.newton@imgtec.com> Signed-off-by: Chris Ball <cjb@laptop.org> |
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