Re: [PATCH v7 0/5] Add Keystone PCIe controller driver

[Bjorn Helgaas <bhelgaas@google.com>]

On Mon, Jul 21, 2014 at 12:58:40PM -0400, Murali Karicheri wrote:
> This patch series add PCIe controller driver for keystone SoCs. This is
> based on v4 of the series posted to the mailing list. Keystone PCI controller
> is based on version 3.65 of the DW hardware. This driver uses the DW core
> functions to implement the PCI controller driver for keystone.
> 
> Testing:
> =======
> 
> Testing of the driver is done on TI's K2HK EVM inserted to a Elma blu!eco
> MicroTCA chassis AMC slot with JumpGen SEM-200 AMC SATA Storage and Dual
> Ethernet Card Express inserted on another AMC slot. The e1000e driver available
> on intel's website is patched to the kernel source tree and build. e1000e.ko
> is dynamically loaded and executed ping and iperf tests to test the
> functionality.
> 
> Thanks to all of you who have contributed by reviewing and offering valuable
> comments. If you want me to add your "Reviewed-by", please let me know so that
> I can add it to the commit log and re-send. Patch 1-3 has Acks from maintainers
> and I believe this can be merged to upstream branch. Patch 4 is waiting for
> Ack from DT maintainer. Please provide the same at the earliest.
> 
> Thanks
> 
> Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
> 
> CC: Russell King <linux@arm.linux.org.uk>
> CC: Grant Likely <grant.likely@linaro.org>
> CC: Rob Herring <robh+dt@kernel.org>
> CC: Mohit Kumar <mohit.kumar@st.com>
> CC: Jingoo Han <jg1.han@samsung.com>
> CC: Bjorn Helgaas <bhelgaas@google.com>
> CC: Pratyush Anand <pratyush.anand@st.com>
> CC: Richard Zhu <r65037@freescale.com>
> CC: Kishon Vijay Abraham I <kishon@ti.com>
> CC: Marek Vasut <marex@denx.de>
> CC: Arnd Bergmann <arnd@arndb.de>
> CC: Pawel Moll <pawel.moll@arm.com>
> CC: Mark Rutland <mark.rutland@arm.com>
> CC: Ian Campbell <ijc+devicetree@hellion.org.uk>
> CC: Kumar Gala <galak@codeaurora.org>
> CC: Randy Dunlap <rdunlap@infradead.org>
> CC: Grant Likely <grant.likely@linaro.org>
> 
> Changelog:
> 
> v7
>  - Removed ti,enable_linktrain DT property. The driver now check if
>    the link is up and then retrain the link if not already up. This
>    is as per comment from DT maintainer.
>  - Rebased to upstream kernel v3.16-rc6
> 
> v6
>  - Added Ack from Maintainer for patch 3. Patch 1-3 now have the
>    Acks from maintainer and can be merged to upstream branch.
>    Patch 4 is waiting ack from DT maintainer.
> v5
>  - Rebased to upstream kernel v3.16-rc5
>  - Reworked Patch 3/6 and 4/6 into a single patch based on
>    maintainer comment to use a API callback model to support
>    the v3.65 h/w.
> v4
>  - Addressed comments against 5/5.
>  - Added a patch 6/6 for Maintainer information
>  - Added couple of Acked-By:
>  - Rebased to latest Linux 3.16-rc4
> v3
>  - DW application register handling code is now part of
>    Keystone PCI driver. RFC had this code part of Keystone
>    PCI driver, then V1 moved this to a separate file to
>    re-use on other platforms that uses this version of the
>    DW h/w. Then based on comments against v2, this is moved
>    back to Keystone driver.
>  - Keystone SerDes phy driver is removed from this series so that
>    this can be merged independent of that patch
>  - added msi_set_irq()/clear_irq() API's to support Keystone
> 
> V2
>  - Split the designware pcie enhancement patch to multiple
>    patches based on functionality added
>  - Remove the quirk code and add a patch to fix mps/mrss
>    tuning for ARM. Use kernel command line parameter
>    pci=pcie_bus_perf to work with Keystone PCI Controller.
>    Following patch addressed this.
>      [PATCH v1] ARM: pci: add call to pcie_bus_configure_settings()
>  - Add documentation for device tree bindings
>  - Add separate interrupt controller nodes for MSI and Legacy
>    IRQs and use irq map for legacy IRQ
>  - Use compatibility to identify v3.65 version of the DW hardware
>    and use it to customize the designware common code.
>  - Use reg property for configuration space instead of range
>  - Other minor updates based on code inspection. 
> 
> V1
>  - Add an interrupt controller node for Legacy irq chip and use
>    interrupt map/map-mask property to map legacy IRQs A/B/C/D
>  - Add a Phy driver to replace the original serdes driver
>  - Move common application register handling code to a separate
>    file to allow re-use across other platforms that use older
>    DW PCIe h/w
>  - PCI quirk for maximum read request size. Check and override only
>    if the maximum is higher than what controller can handle.
>  - Converted to a module platform driver.
> 
> Murali Karicheri (5):
>   PCI: designware: add rd[wr]_other_conf API
>   PCI: designware: refactor MSI code to work with v3.65 dw hardware

I applied the above two to my pci/host-designware branch.  The rest didn't
apply cleanly because I applied Kishon's DRA7xx changes first, and there
are several conflicts.  Can you rebase the rest of them on top of
pci/host-designware?

>   PCI: designware: enhance dw_pcie_host_init() to support v3.65 DW
>     hardware
>   PCI: add PCI controller for keystone PCIe h/w
>   PCI: keystone: Update maintainer information

You can squash the MAINTAINERS update into the driver addition.  They're
logically part of the same change.

Bjorn

>  .../devicetree/bindings/pci/pci-keystone.txt       |   68 +++
>  MAINTAINERS                                        |    7 +
>  drivers/pci/host/Kconfig                           |    5 +
>  drivers/pci/host/Makefile                          |    1 +
>  drivers/pci/host/pci-keystone-dw.c                 |  521 ++++++++++++++++++++
>  drivers/pci/host/pci-keystone.c                    |  386 +++++++++++++++
>  drivers/pci/host/pci-keystone.h                    |   58 +++
>  drivers/pci/host/pcie-designware.c                 |  116 +++--
>  drivers/pci/host/pcie-designware.h                 |    9 +
>  9 files changed, 1135 insertions(+), 36 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/pci/pci-keystone.txt
>  create mode 100644 drivers/pci/host/pci-keystone-dw.c
>  create mode 100644 drivers/pci/host/pci-keystone.c
>  create mode 100644 drivers/pci/host/pci-keystone.h
> 
> -- 
> 1.7.9.5
>