linux-kernel - [PATCH v6 0/6] Add SiFive FU740 PCIe host controller driver support

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Message-Id: <20210504105940.100004-1-greentime.hu@sifive.com>
Date:   Tue,  4 May 2021 18:59:34 +0800
From:   Greentime Hu <greentime.hu@...ive.com>
To:     greentime.hu@...ive.com, paul.walmsley@...ive.com, hes@...ive.com,
        erik.danie@...ive.com, zong.li@...ive.com, bhelgaas@...gle.com,
        robh+dt@...nel.org, aou@...s.berkeley.edu, mturquette@...libre.com,
        sboyd@...nel.org, lorenzo.pieralisi@....com,
        p.zabel@...gutronix.de, alex.dewar90@...il.com,
        khilman@...libre.com, hayashi.kunihiko@...ionext.com,
        vidyas@...dia.com, jh80.chung@...sung.com,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, helgaas@...nel.org
Subject: [PATCH v6 0/6] Add SiFive FU740 PCIe host controller driver support

This patchset includes SiFive FU740 PCIe host controller driver. We also
add pcie_aux clock and pcie_power_on_reset controller to prci driver for
PCIe driver to use it.

This is tested with e1000e: Intel(R) PRO/1000 Network Card, AMD Radeon R5
230 graphics card and SP M.2 PCIe Gen 3 SSD in SiFive Unmatched based on
v5.11 Linux kernel.

Changes in v6:
 - Fix build error when CONFIG_GPIOLIB disabled

Changes in v5:
 - Fix typo in comments
 - Keep comments style consistent
 - Refine some error handling codes
 - Remove unneeded header file including
 - Merge fu740_pcie_ltssm_enable implementation to fu740_pcie_start_link

Changes in v4:
 - Fix Wunused-but-set-variable warning in prci driver

Changes in v3:
 - Remove items that has been defined
 - Refine format of sifive,fu740-pcie.yaml
 - Replace perstn-gpios with the common one
 - Change DBI mapping space to 2GB from 4GB
 - Refine drivers/reset/Kconfig

Changes in v2:
 - Refine codes based on reviewers' feedback
 - Remove define and use the common one
 - Replace __raw_writel with writel_relaxed
 - Split fu740_phyregreadwrite to write function
 - Use readl_poll_timeout in stead of while loop checking
 - Use dwc common codes
 - Use gpio descriptors and the gpiod_* api.
 - Replace devm_ioremap_resource with devm_platform_ioremap_resource_byname
 - Replace devm_reset_control_get with devm_reset_control_get_exclusive
 - Add more comments for delay and sleep
 - Remove "phy ? x : y" expressions
 - Refine code logic to remove possible infinite loop
 - Replace magic number with meaningful define
 - Remove fu740_pcie_pm_ops
 - Use builtin_platform_driver

Greentime Hu (5):
  clk: sifive: Add pcie_aux clock in prci driver for PCIe driver
  clk: sifive: Use reset-simple in prci driver for PCIe driver
  MAINTAINERS: Add maintainers for SiFive FU740 PCIe driver
  dt-bindings: PCI: Add SiFive FU740 PCIe host controller
  riscv: dts: Add PCIe support for the SiFive FU740-C000 SoC

Paul Walmsley (1):
  PCI: fu740: Add SiFive FU740 PCIe host controller driver

 .../bindings/pci/sifive,fu740-pcie.yaml       | 113 +++++++
 MAINTAINERS                                   |   8 +
 arch/riscv/boot/dts/sifive/fu740-c000.dtsi    |  33 ++
 drivers/clk/sifive/Kconfig                    |   2 +
 drivers/clk/sifive/fu740-prci.c               |  11 +
 drivers/clk/sifive/fu740-prci.h               |   2 +-
 drivers/clk/sifive/sifive-prci.c              |  54 +++
 drivers/clk/sifive/sifive-prci.h              |  13 +
 drivers/pci/controller/dwc/Kconfig            |  10 +
 drivers/pci/controller/dwc/Makefile           |   1 +
 drivers/pci/controller/dwc/pcie-fu740.c       | 309 ++++++++++++++++++
 drivers/reset/Kconfig                         |   1 +
 include/dt-bindings/clock/sifive-fu740-prci.h |   1 +
 13 files changed, 557 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/pci/sifive,fu740-pcie.yaml
 create mode 100644 drivers/pci/controller/dwc/pcie-fu740.c

-- 
2.31.1