Commit Graph

11 Commits

Author SHA1 Message Date
Stepan Moskovchenko b0e7808d54 msm: iommu: Don't read from write-only registers
Don't read from V2Pxx command registers when doing
iova-to-phys operations. These registers are write-only and
reading the value before modifying the VA bits is
unnecessary.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>
2011-03-08 14:42:30 -08:00
Stepan Moskovchenko a43d8c101e msm: iommu: Remove dependency on IDR
Remove the depencency on the IOMMU IDR register, as it may
not be accessible depending on the security configuraton.
This involves moving the NCB field of IDR into the platform
data.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>
2011-03-08 14:40:59 -08:00
Stepan Moskovchenko 2e8c8ba983 msm: iommu: Use ASID tagging instead of VMID tagging
Use ASID tags in the TLB instead of VMID tags in
preparation for changes to the secure environment.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>
2011-03-08 14:40:58 -08:00
Stepan Moskovchenko 41f3f5138a msm: iommu: Clock control for the IOMMU driver
Add clock control to the IOMMU driver. The IOMMU bus clock
(and potentially an AXI clock) need to be on to gain access
to IOMMU registers. Actively control these clocks when
needed instead of leaving them on.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>
2011-03-08 14:40:58 -08:00
Stepan Moskovchenko 294b2dea83 msm: iommu: Use the correct memory allocation flag
Change msm_iommu_map to use GFP_ATOMIC instead of
GFP_KERNEL due to the fact that the call occurs within
a spinlock-protected region.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>
2010-12-15 14:09:59 -08:00
Stepan Moskovchenko 33069739d1 msm: iommu: Miscellaneous code cleanup
Remove some unneeded assignments and messages, restructure
a failure path in iova_to_phys, and make __flush_iotlb
return int in preparation for adding IOMMU clock control.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
2010-11-30 16:12:00 -08:00
Stepan Moskovchenko 100832c9b6 msm: iommu: Support cache-coherent memory access
Add support for allowing IOMMU memory transactions to be
cache coherent, eliminating the need for software cache
management in certain situations. This can lead to
improvements in performance and power usage, assuming the
multimedia core's access pattern exhibits spatial locality
and that its working set fits into the cache.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
2010-11-30 16:10:53 -08:00
Stepan Moskovchenko 00d4b2bb03 msm: iommu: Check if device is already attached
An IOMMU device can only be attached to one IOMMU domain at
any given time. Check whether the device is already
attached to a domain before allowing it to be attached to
another domain. If so, return busy.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
2010-11-30 16:03:51 -08:00
Stepan Moskovchenko f6f41eb9cc msm: iommu: Don't flush page tables if no devices attached
Don't flush the page tables on an IOMMU domain if there are
no IOMMU devices attached to the domain. The act of
attaching to the domain will cause an implicit flush of
those areas if the page tables are configured to not be L2
cacheable.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
2010-11-30 14:04:21 -08:00
Stepan Moskovchenko 516cbc793e msm: iommu: Mark functions with the right section names
Mark the init and exit functions as __init and __exit where
appropriate.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
2010-11-30 14:03:36 -08:00
Stepan Moskovchenko 0720d1f052 msm: Add MSM IOMMU support
Add support for the IOMMUs found on the upcoming Qualcomm
MSM8x60 chips. These IOMMUs allow virtualization of the
address space used by most of the multimedia cores on these
chips.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
2010-10-08 15:12:50 -07:00