i2c: at91: add dma support

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Add dma support for Atmel TWI which is available on sam9x5 and later.

When using dma for reception, you have to read only n-2 bytes. The last
two bytes are read manually. Don't doing this should cause to send the
STOP command too late and then to get extra data in the receive
register.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>

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Ludovic Desroches 2012-11-23 10:09:04 +01:00 • committed by Wolfram Sang

parent 5f433819b3

commit 60937b2cdb

1 changed files with 298 additions and 8 deletions

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drivers/i2c/busses/i2c-at91.c

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