Hi,
Changes compared to previous version:
- patch2:
* fixed the timeout for waiting for ST_IO_CHAIN == 1
* added clear for ST_IO_CHAIN bit (as per spec + implementation in patch 1)
* replaced the timeout at the end of function with a simple register
readback (timing out on a register value that we are clearing does
not make that much sense, the bit is cleared the very first time CPU
manages to read it)
- patch5:
* added spinlock for protecting io_chain_trigger operation
Tested on omap3 beagle + omap4 blaze. Also did measurements for the
cost of IO chain trigger operation with ARM performance counters:
- omap3 approx 7...8us
- omap4 approx 2...4us
-Tero
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