Enable tuning of the PCI Express MPS (Maximum Payload Size) of
each device. The Maximum Read Request Size is not altered.

The SAFE method uses the largest MPS value supported by all devices in the
system for each device. This method is the same algorithm as used by Linux
pci=pcie_bus_safe.

The PEER2PEER method sets all devices to the minimal (128 byte) MPS, which
allows hot plug of devices later that might only support the minimum size,
and ensures compatibility of DMA between two devices on the bus.

Signed-off-by: Stephen Carlson <stcarlso@linux.microsoft.com>

pci_find_first_device description says it can be used for iteration with
itself but it should really be with pci_find_next_device

Signed-off-by: Michal Suchanek <msuchanek@suse.de>

Add a mask parameter to control the lookup of the PCI region from which
the mapping can be made.

Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

Add mask parameter and reorder length parameter to match the other PCI
address conversion functions. Using PCI_REGION_TYPE as the mask gives
the old behaviour.

It's converted from a macro to an inline function as the length
parameter is now used twice, but should only be calculated once.

Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

When converting addresses, apply a mask to the region flags during
lookup. This allows the caller to specify which flags are important and
which are not, for example to exclude system memory regions.

The behaviour of the function is changed such that they don't
preferentially search for a non-system memory region. However, system
memory regions are added after other regions in decode_regions() leading
to a similar outcome.

Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

Evolve dm_pci_map_bar() to include an offset and length parameter. These
allow a portion of the memory to be mapped and range checks to be
applied.

Passing both the offset and length as zero results in the previous
behaviour and this is used to migrate the previous callers.

Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

When converting between PCI bus and physical addresses, include a length
parameter that can be used to check that the entire range fits within
one of the PCI regions. This prevents an address being returned that
might be only partially valid for the range it is going to be used for.

Where the range check is not wanted, passing a length of 0 will have the
same behaviour as before this change.

Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

The flags parameter of dm_pci_map_bar() is used for PCI region flags
rather than memory mapping flags. Fix the type to match that of the
region flags and stop using the regions flags as memory mapping flags.

Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

Macros PCI_CLASS_CODE_* and PCI_CLASS_SUB_CODE_* are unused and are
duplication of PCI_CLASS_* macros defined in pci_ids.h header file.
So remove them.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>

PCI config space of the aardvark PCIe Root Port is available only in
internal aardvark memory space starting at offset 0x0. PCI Express
registers (PCI_EXP_*) start at offset 0xc0. And Advanced Error Reporting
registers (PCI_ERR_*) start at offset 0x100.

Replace custom aardvark register macros by standard PCI macros from
include/pci.h file with fixed offset.

Some DEVCTL and AER macros are not defined in include/pci.h file, so define
them in the same way as in linux uapi header file pci_regs.h.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>