iommu: rockchip: Fix directory table address encoding

iommu: rockchip: Fix directory table address encoding

[ Upstream commit 6df63b7ebdaf5fcd75dceedf6967d0761e56eca1 ]

The physical address to the directory table is currently encoded using
the following bit layout for IOMMU v2.

 31:12 - Address bit 31:0
 11: 4 - Address bit 39:32

This is also the bit layout used by the vendor kernel.

However, testing has shown that addresses to the directory/page tables
and memory pages are all encoded using the same bit layout.

IOMMU v1:
 31:12 - Address bit 31:0

IOMMU v2:
 31:12 - Address bit 31:0
 11: 8 - Address bit 35:32
  7: 4 - Address bit 39:36

Change to use the mk_dtentries ops to encode the directory table address
correctly. The value written to DTE_ADDR may include the valid bit set,
a bit that is ignored and DTE_ADDR reg read it back as 0.

This also update the bit layout comment for the page address and the
number of nybbles that are read back for DTE_ADDR comment.

These changes render the dte_addr_phys and dma_addr_dte ops unused and
is removed.

Fixes: 227014b33f62 ("iommu: rockchip: Add internal ops to handle variants")
Fixes: c55356c534aa ("iommu: rockchip: Add support for iommu v2")
Fixes: c987b65a574f ("iommu/rockchip: Fix physical address decoding")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20230617182540.3091374-2-jonas@kwiboo.se
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>