On 15.07.2020 12:32, Robin Murphy wrote:
On 2020-07-15 08:06, Tomasz Nowicki wrote:
From: Hanna Hawa <hannah@xxxxxxxxxxx>
Due to erratum #582743, the Marvell Armada-AP806 can't access 64bit to
ARM SMMUv2 registers.
Provide implementation relevant hooks:
- split the writeq/readq to two accesses of writel/readl.
- mask the MMU_IDR2.PTFSv8 fields to not use AArch64 format (but
only AARCH32_L) since with AArch64 format 32 bits access is not
supported.
Note that most 64-bit registers like TTBRn can be accessed as two 32-bit
halves without issue, and AArch32 format ensures that the register writes
which must be atomic (for TLBI etc.) need only be 32-bit.
Thanks Tomasz, this has ended up as clean as I'd hoped it could, and
there's still room to come back and play more complicated games later if
a real need for AARCH64_64K at stage 2 crops up.
Based on your implementation infrastructure rework, indeed the code
looks much cleaner :)
Reviewed-by: Robin Murphy <robin.murphy@xxxxxxx>
Thanks!
Tomasz
