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author | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2015-05-28 11:40:54 +0200 |
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committer | Gregory CLEMENT <gregory.clement@free-electrons.com> | 2015-05-28 12:21:08 +0200 |
commit | bfa1ce5f38938cc9e6c7f2d1011f88eba2b9e2b2 (patch) | |
tree | b4eb98e065a7342c9d02548df3e7ea22a09529b7 /drivers/pci/xen-pcifront.c | |
parent | Revert "bus: mvebu-mbus: make sure SDRAM CS for DMA don't overlap the MBus br... (diff) | |
download | linux-bfa1ce5f38938cc9e6c7f2d1011f88eba2b9e2b2.tar.xz linux-bfa1ce5f38938cc9e6c7f2d1011f88eba2b9e2b2.zip |
bus: mvebu-mbus: add mv_mbus_dram_info_nooverlap()
This commit introduces a variant of the mv_mbus_dram_info() function
called mv_mbus_dram_info_nooverlap(). Both functions are used by
Marvell drivers supporting devices doing DMA, and provide them a
description the DRAM ranges that they need to configure their DRAM
windows.
The ranges provided by the mv_mbus_dram_info() function may overlap
with the I/O windows if there is a lot (>= 4 GB) of RAM
installed. This is not a problem for most of the DMA masters, except
for the upcoming new CESA crypto driver because it does DMA to the
SRAM, which is mapped through an I/O window. For this unit, we need to
have DRAM ranges that do not overlap with the I/O windows.
A first implementation done in commit 1737cac69369 ("bus: mvebu-mbus:
make sure SDRAM CS for DMA don't overlap the MBus bridge window"),
changed the information returned by mv_mbus_dram_info() to match this
requirement. However, it broke the requirement of the other DMA
masters than the DRAM ranges should have power of two sizes.
To solve this situation, this commit introduces a new
mv_mbus_dram_info_nooverlap() function, which returns the same
information as mv_mbus_dram_info(), but guaranteed to not overlap with
the I/O windows.
In the end, it gives us two variants of the mv_mbus_dram_info*()
functions:
- The normal one, mv_mbus_dram_info(), which has been around for many
years. This function returns the raw DRAM ranges, which are
guaranteed to use power of two sizes, but will overlap with I/O
windows. This function will therefore be used by all DMA masters
(SATA, XOR, Ethernet, etc.) except the CESA crypto driver.
- The new 'nooverlap' variant, mv_mbus_dram_info_nooverlap(). This
function returns DRAM ranges after they have been "tweaked" to make
sure they don't overlap with I/O windows. By doing this tweaking,
we remove the power of two size guarantee. This variant will be
used by the new CESA crypto driver.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Diffstat (limited to 'drivers/pci/xen-pcifront.c')
0 files changed, 0 insertions, 0 deletions