tree c28aa6ade5a9ad28972de815648f82104796942c
parent ccd4d5a0d484c929bf78772f0a5f8dfd91e078ab
author Marek Vasut <marex@denx.de> 1341794913 +0000
committer Albert ARIBAUD <albert.u.boot@aribaud.net> 1346504296 +0200

MX28: SPI: Add DMA transfer support

The DMA transfers happen only if the transfered data are larger
than 512 bytes. Otherwise PIO is used. This is a small speed
optimization.

The DMA transfer doesn't work if unaligned transfer is requested
due to the limitation of the DMA controller. This has to be fixed
by introducing generic bounce buffer. Therefore the DMA feature
is now disabled by default.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Denk <wd@denx.de>