this driver controls CESA unit as same as mvcesa, but uses DMA engines and
does CBC operations, HMAC operations by hardware. about 2 kbytes of data
are processed at one. supported algorithms are:
- DES-CBC, 3DES-CBC, AES-CBC
- HMAC-SHA1, HMAC-MD5
non-CBC algorithm such as AES-GCM is not supported by CESA's acceleration
engine. mvcesa is still useful to implement such algorithms as combination of
accelerated block cipher and software chaining.
the buffer management(ex. fill the rx descriptors/buffers) is done by H/W in
ARMADA XP/380, and is done by S/W in ARMADA 370. the H/W BM support is not yet
implemented, so all devices use the S/W management mode at this time.
