On 11/19/2017 09:56 PM, Max Filippov wrote: > On Sat, Nov 18, 2017 at 7:36 PM, ayaka <[email protected]> wrote: >> What I want is a relaxed version of the io{read,write}32, as I don't need to >> flush between I am writing the registers table into the registers. I only >> want to flush the cache at the last and isolated register which I will set >> later. > None of these functions do anything with cache. And with > devm_ioremap_resource you will likely get an uncached mapping of your > IO memory, so you don't even need to manage cache. I didn't notice that the IO memory is not cached at the most platform, even the ldd3 have said that. > What you still need to preserve the order of writes is a memory barrier, > and none of io{read,write}32 do it either. You can insert proper barrier > before the write to that last isolated register. I see, thank you.
_______________________________________________ Kernelnewbies mailing list [email protected] https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
