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    • Chip Coldwell's avatar
      atmel_serial: add DMA support · a6670615
      Chip Coldwell authored
      
      
      This patch is based on the DMA-patch by Chip Coldwell for the AT91/AT32 serial
      USARTS, with some tweaks to make it apply neatly on top of the other patches
      in this series.
      
      The RX and TX code has been moved to a tasklet and reworked a bit.  Instead of
      depending on the ENDRX and TIMEOUT bits in CSR, we simply grab as much data as
      we can from the DMA buffers.  I think this closes a race where the ENDRX bit
      is set after we read CSR but before we read RPR, although I haven't confirmed
      this.
      
      Similarly, the two TX handlers (ENDTX and TXBUFE) have been combined into one.
       Since the current code only uses a single TX buffer, there's no point in
      handling those interrupts separately.
      
      This also fixes a DMA sync bug in the original patch.
      
      [linux@bohmer.net: rebased onto irq-splitup patch]
      [hskinnemoen@atmel.com: moved to tasklet, fixed dma bug, misc cleanups]
      [hskinnemoen@atmel.com: atmel_serial dma: Misc fixes and cleanups]
      Signed-off-by: default avatarRemy Bohmer <linux@bohmer.net>
      Signed-off-by: default avatarHaavard Skinnemoen <hskinnemoen@atmel.com>
      Cc: Andrew Victor <linux@maxim.org.za>
      Tested-by: default avatarMarc Pignat <marc.pignat@hevs.ch>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      a6670615
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