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How to use CRCU with Security Engine in linux kernel?

Question asked by quanli wang on Mar 6, 2016
Latest reply on Mar 6, 2016 by bpe

My platform: P1020, linux 3.0.51

Linux Driver: driver/crypto/talitos.c

 

Hi,

    I want to do CRC using Security Engine 'cryto' in kernel because I have so many data and CRC must be complete in very little time. As I know that P1020 has security engine and can do these very quickly. I have learned that  there is a function 'talitos_submit' which I can use, but I don't know how to do this, what to fill the input parameter and where to get the crc's result.

  My question:

1. How to use DMA when do this opration? In the file talitos.c, I see that only setting the DMA address to desc before submit 'GO' to channel fetch fifo register in talitos_submit (). My question: where to trigger DMA start?

2. About using  descriptor type 0001_0 with CRCU. And CRCU Mode Register ALG is '10 Static custom mode.'. My question is that do I need to config CRCU register, betore writing polynomial to CRCU Key Register? Is there a example just like &3.14 in file AN3645.pdf?

 

Thanks

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