On 03/08/2012 05:21 PM, Marc Butler wrote:
All, This patch provides generic functions for encoding/decoding SLIMbus messages (Section 8 of the specification).
Thanks for providing this patch. My understanding is that this patch provides helper functions for h/w controllers which rely on s/w to provide the exact message to be sent out on the bus.
No CRC generator is included for the PI and MI fields. The OMAP4430 chip this is being tested on generates and populates these fields in h/w. However, I have include a general (and untested) callback mechanism.
Just like CRC, some other fields may be populated by HW. e.g. Qualcomm chip also populates Arbitration priority, Arbitration Extension fields. So it expects SW to only program a few fields, a.k.a logical/elemental address, MT,MC, DT etc.(that too, SW programs this based on software interface manual). The hardware will convert this information to actual slimbus-compliant message and send it on the bus.
Being said that, I am not aware of how majority of h/w controllers work and will be open to have this patch if other hardwares rely on s/w to provide the exact message as well.
-Sagar
-m
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