From: Stuart Yoder stuart.yoder@nxp.com
A binding for PCI nodes has been finalized specifying how PCI device IDs can be mapped to MSI specifiers. See Documentation/devicetree/bindings/pci/pci-msi.txt in the kernel.
For ls2080a and similar Layerscape SoCs, the MSI specifier is the stream id. A programmable table (LUT) in the PCI controller defines the hardware mapping of PCI requester IDs to stream IDs.
This patch series implements support for this mapping.
Version 6 of the series squashes patches 4-7 together to avoid static functions defined but not used. This results in 5 patches:
Patch 1 removes the obsolete available-stream-id support. Patch 2 updates stream ID partitioning info to be current Patch 3 updates pci.h so pci_get_hose_head() is available Patch 4 defines LUT register offsets Patch 5 implements a function to iterate over all PCI buses and set up a LUT entry and msi-map for all discovered devices. Helper functions allocate LUT entries, streamIDs, and append msi-map entries.
This patch series enables MSIs on ls2080a on v4.5-rc5 and later kernels. The obsolete support removed was unused in any upstream kernels.
-v2 changes -in patch 7 removed skip of the host bridge when scanning the bus -v3 changes -patch 4: moved LUT #defines to immap_lsch3.h, made index allocator return an int -patch 5: return 0xffffffff on error -patch 7: fixed return value checks -v4 changes -put all device ID to stream ID mapping under LS2 #ifdefs -v5 changes -check CONFIG_FSL_LSCH3 instead of SoC specific defines -v6 changes -squashed patches 4-7 together, split out LUT #defines into separate patch, replaced a remaining SoC define with CONFIG_FSL_LSCH3
Stuart Yoder (5): armv8: ls2080a: remove obsolete stream ID partitioning support armv8: ls2080a: update stream ID partitioning info pci: make pci_get_hose_head() available to external users pci/layerscape: add defines for LUT pci/layerscape: set LUT and msi-map for discovered PCI devices
arch/arm/cpu/armv8/fsl-layerscape/fdt.c | 113 ---------- .../include/asm/arch-fsl-layerscape/immap_lsch3.h | 4 + .../asm/arch-fsl-layerscape/ls2080a_stream_id.h | 55 +++-- drivers/pci/pcie_layerscape.c | 217 +++++++++++++------- include/pci.h | 1 + 5 files changed, 186 insertions(+), 204 deletions(-)