From: Daire McNamara <daire.mcnamara@xxxxxxxxxxxxx> Microchip PolarFire SoC is a 64-bit device and has DDR starting at 0x80000000 and 0x1000000000. Its PCIe rootport is connected to the CPU Coreplex via an FPGA fabric. The AXI connections between the Coreplex and the fabric are 64-bit and the AXI connections between the fabric and the rootport are 32-bit. For the CPU CorePlex to act as an AXI-Master to the PCIe devices and for the PCIe devices to act as bus masters to DDR at these base addresses, the fabric can be customised to add/remove offsets for bits 38-32 in each direction. These offsets, if present, vary with each customer's design. To support this variety, the rootport driver must know how much address translation (both inbound and outbound) is performed by a particular customer design and how much address translation must be provided by the rootport. This patchset contains a parent/child dma-ranges scheme suggested by Rob Herring. It creates an FPGA PCIe parent bus which wraps the PCIe rootport and implements a parsing scheme where the root port identifies what address translations are performed by the FPGA fabric parent bus, and what address translations must be done by the rootport itself. See https://lore.kernel.org/linux-pci/20220902142202.2437658-1-daire.mcnamara@xxxxxxxxxxxxx/ for the relevant previous patch submission discussion. It also re-partitions the probe() and init() functions as suggested by Bjorn Helgaas to make them more maintainable as the init() function had become too large. It also contains some minor fixes and clean-ups that are pre-requisites: - to align register, offset, and mask names with the hardware documentation and to have the register definitions appear in the same order as in the hardware documentation; - to harvest the MSI information from the hardware configuration register as these depend on the FPGA fabric design and can vary with different customer designs; - to clean up interrupt initialisation to make it more maintainable; - to fix SEC and DED interrupt handling. I expect Conor will take the dts patch via the soc tree once the PCIe parts of the series are accepted. Conor Dooley (1): riscv: dts: microchip: add parent ranges and dma-ranges for IKRD v2022.09 Daire McNamara (8): PCI: microchip: Align register, offset, and mask names with hw docs PCI: microchip: Correct the DED and SEC interrupt bit offsets PCI: microchip: Enable event handlers to access bridge and ctrl ptrs PCI: microchip: Clean up initialisation of interrupts PCI: microchip: Gather MSI information from hardware config registers PCI: microchip: Re-partition code between probe() and init() PCI: microchip: Partition outbound address translation PCI: microchip: Partition inbound address translation .../dts/microchip/mpfs-icicle-kit-fabric.dtsi | 62 +- drivers/pci/controller/pcie-microchip-host.c | 676 +++++++++++++----- 2 files changed, 522 insertions(+), 216 deletions(-) base-commit: 3c1f24109dfc4fb1a3730ed237e50183c6bb26b3 -- 2.25.1
