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| /openbmc/linux/drivers/tty/serial/ |
| H A D | atmel_serial.c | diff 34df42f59a602241b416001516d53fcfe35072b2 Mon Jul 22 03:30:27 CDT 2013 Elen Song <elen.song@atmel.com> serial: at91: add rx dma support
Request a cyclic dma channel for rx dma use. Use cyclic transfer is to prevent
receive data overrun.
We allocate a cycle dma cookie after request channel,
after that, enable uart timeout interrupt in startup stage, when data successful
received, the timeout callback will check the residual bytes and insert
receiving datas into the framework during the transfer interval.
When current descriptor finished, the dma callback will also check the residual
bytes and filp the receiving data.
Signed-off-by: Elen Song <elen.song@atmel.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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