[PATCH v2 0/3] pci/designware: Add architecture-independent driver for Designware PCIe

[Minghuan Lian]

The Synopsys Designware IP is shared with couples of platforms
under multiple architectures. The series of patches is to
provide basic architecture-independent Designware PCIe host
driver including ATU initialization and PCI OPS. Currently,
which supports arm and arm64 simultaneously.

I do not directly add arm64 support to pcie-designware.c, the
main reason is that it is hard to port other 5 platform PCIe
driver based on pcie-designware to the new implementation.
However, not changing those PCIe driver means the code for
arm32 must be remained.

I add a new file pcie-designware-base.c. Compared with
pcie-designware.c, there are main 3 differences.
1. It is a new implementation followed the latest PCIe
architecture-independent API without any code for specific
architecture.
2. There is no MSI chip code, which will be implemented in a 
separated file.
3. Improve ATU use - support more than 2 ATUs and use an exclusive
ATU to translate MEM transaction.

Signed-off-by: Minghuan Lian <Minghuan.Lian at freescale.com>

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1.9.1