The following patchset cleans up the atmel_serial driver a bit,
moves a significant portion of the interrupt handler into a tasklet,
and adds DMA support. This is the result of a combined effort by Chip
Coldwell, Remy Bohmer and me. The patches should apply cleanly onto
Linus' latest git tree.
With DMA, I see transfer rates around 92 kbps when transferring a big
file using ZModem (both directions are roughly the same.)
Note that break and error handling doesn't work too well with DMA
enabled. This is a common problem with all the efforts I've seen
adding DMA support to this driver (including my own). The PDC error
handling also accesses icount without locking. I'm tempted to just
ignore the problem for now and hopefully come up with a solution
later.
Everyone, please give it a try and/or review the code.
Chip Coldwell (1):
atmel_serial: Add DMA support
Haavard Skinnemoen (3):
atmel_serial: Use cpu_relax() when busy-waiting
atmel_serial: Use existing console options only if BRG is running
atmel_serial: Fix bugs in probe() error path and remove()
Remy Bohmer (2):
atmel_serial: Clean up the code
atmel_serial: Split the interrupt handler
drivers/serial/atmel_serial.c | 938 ++++++++++++++++++++++++++++++++---------
1 files changed, 738 insertions(+), 200 deletions(-)
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