[PATCH v5 0/5] Add iProc PCIe PAXC and MSI support

[Ray Jui]

This patch series adds support for the iProc PAXC interface and support for
event queue based MSI, integrated in the iProc PCIe core

This patch series is based on Linux v4.4-rc1 and is avaliable here:
https://github.com/Broadcom/cygnus-linux/tree/iproc-msi-v5

Changes from v4:
- Make 'iproc_msi_exit' inline to fix compiler warning when CONFIG_PCI_MSI
is disabled

Changes from v3:
- Detect the number of possible CPUs instead online CPUs in the driver. Note
CPU notifier based implementation still needs to be added in the future, for
proper support of MSI IRQ affinity when CPU is brought online/offline at
runtime. Support in this dirver will be added when we support CPU hotplug in
one of iProc family of SoCs so the changes can be tested
- Use dma_zalloc_coherent for event queue host memory allocation and zeoring

Changes from v2:
- Improved descriptions in the iProc MSI commit message
- Removed redundant host memory used for MSI address. The MSI posted writes
never really hit the memory. Use iProc PCIe controller base address instead
- Fixed deadlock when MSI vectors are used up
- Enforced the number of MSI groups to always be multiple of the number of CPUs
- Improved the efficiency of MSI event processing by only updating the head
pointer after finishing processing all outstanding events
- Fixed error handling code to make sure all configurations are rolled back
- Added code to zero the host memory used for event queues after allocation
- Removed redundant 'brcm,num-eq-region' and 'brcm,num-msi-msg-region' DT
  properties. Now determine the number of regions based on interface type
- Other misc. changes

Changes from v1:
- Fixed incorrect 1-to-1 mapping between MSI vector and GIC interrupt. Now the
driver supports multiple MSI vectors per GIC interrupt
- Added MSI IRQ affinity support by distributing GIC interrupts across
available CPU cores and dynamically steer MSI vectors to the target CPU
- replace readl/writel with readl_relaxed/writel_relaxed since all register
accesses within the iProc MSI driver are to/from the same I/O block, i.e., the
iProc PCIe core
- Removed all redundant irq_chip callback assignments
- Changed to use uncached host memory for both MSI posted writes and event
queues
- Add functions to free resources in error/exit cases
- In pcie-iproc-platform.c, pass in interface type through OF device data
- Moved define for max number of interrupts from pcie-iproc.h to
pcie-iproc-msi.c
- Other misc. changes

Ray Jui (5):
  PCI: iproc: Update iProc PCIe device tree binding
  PCI: iproc: Add PAXC interface support
  PCI: iproc: Add iProc PCIe MSI device tree binding
  PCI: iproc: Add iProc PCIe MSI support
  ARM: dts: Enable MSI support for Broadcom Cygnus

 .../devicetree/bindings/pci/brcm,iproc-pcie.txt    |  40 +-
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |  22 +
 drivers/pci/host/Kconfig                           |   9 +
 drivers/pci/host/Makefile                          |   1 +
 drivers/pci/host/pcie-iproc-bcma.c                 |   1 +
 drivers/pci/host/pcie-iproc-msi.c                  | 675 +++++++++++++++++++++
 drivers/pci/host/pcie-iproc-platform.c             |  25 +-
 drivers/pci/host/pcie-iproc.c                      | 228 +++++--
 drivers/pci/host/pcie-iproc.h                      |  42 +-
 9 files changed, 1000 insertions(+), 43 deletions(-)
 create mode 100644 drivers/pci/host/pcie-iproc-msi.c

-- 
1.9.1

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