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On Tue, 18 Dec 2007, Haavard Skinnemoen wrote:
> From: Chip Coldwell <[email protected]>
>
> 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 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.
>
> This also fixes a DMA sync bug in the original patch.
>
> [[email protected]: rebased onto irq-splitup patch]
> [[email protected]: moved to tasklet, fixed dma bug, misc cleanups]
> Signed-off-by: Remy Bohmer <[email protected]>
> Signed-off-by: Haavard Skinnemoen <[email protected]>
> ---
> drivers/serial/atmel_serial.c | 386 ++++++++++++++++++++++++++++++++++++++--
> 1 files changed, 366 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
> index 990d3ab..07c2734 100644
> --- a/drivers/serial/atmel_serial.c
> +++ b/drivers/serial/atmel_serial.c
> @@ -7,6 +7,8 @@
> * Based on drivers/char/serial_sa1100.c, by Deep Blue Solutions Ltd.
> * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
> *
> + * DMA support added by Chip Coldwell.
I will ACK/Sign-off on this soon; I just want to do some tests on real
hardware first.
Chip
- --
Charles M. Coldwell
"Turn on, log in, tune out"
Somerville, Massachusetts, New England
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