From: Conor Dooley <conor.dooley@xxxxxxxxxxxxx> Hey all, This patchset adds support for the "Auto Update" feature on PolarFire SoC that allows for writing an FPGA bistream to the SPI flash connected to the system controller. On powercycle (or reboot depending on how the firmware implements the openSBI SRST extension) "Auto Update" will take place, and program the FPGA with the contents of the SPI flash - provided that that image is valid and an actual upgrade from that already programmed! Unfortunately, this series is not really testable yet - the Engineering Sample silicon on most dev boards has a bug in the QSPI controller connected to the system controller's flash and cannot access it. Pre-production and later silicon has this bug fixed. I previously posted an RFC about my approach in this driver, since as a flash-based FPGA we are somewhat different to the existing self-reprogramming drivers here. That RFC is here: https://lore.kernel.org/linux-fpga/20221121225748.124900-1-conor@xxxxxxxxxx/ This series depends on the following fixes: https://patchwork.kernel.org/project/linux-riscv/list/?series=714160 The patch adding the driver depends on the soc patches earlier in the series, so taking both through the same tree makes sense. Depending on sequencing with the dependencies, me taking it through the soc tree (with Acks etc of course) may make the most sense. The other caveat here I guess is that this uses debugfs to trigger the write, as we do not yet have a userspace for this yet! Cheers, Conor. CC: Conor Dooley <conor.dooley@xxxxxxxxxxxxx> CC: Daire McNamara <daire.mcnamara@xxxxxxxxxxxxx> CC: Rob Herring <robh+dt@xxxxxxxxxx> CC: Krzysztof Kozlowski <krzysztof.kozlowski+dt@xxxxxxxxxx> CC: Moritz Fischer <mdf@xxxxxxxxxx> CC: Wu Hao <hao.wu@xxxxxxxxx> CC: Xu Yilun <yilun.xu@xxxxxxxxx> CC: Tom Rix <trix@xxxxxxxxxx> CC: linux-riscv@xxxxxxxxxxxxxxxxxxx CC: devicetree@xxxxxxxxxxxxxxx CC: linux-kernel@xxxxxxxxxxxxxxx CC: linux-fpga@xxxxxxxxxxxxxxx Conor Dooley (6): soc: microchip: mpfs: add a prefix to rx_callback() dt-bindings: soc: microchip: add a property for system controller flash soc: microchip: mpfs: enable access to the system controller's flash soc: microchip: mpfs: add auto-update subdev to system controller fpga: add PolarFire SoC Auto Update support riscv: dts: microchip: add the mpfs' system controller qspi & associated flash .../microchip,mpfs-sys-controller.yaml | 10 + .../boot/dts/microchip/mpfs-icicle-kit.dts | 21 + arch/riscv/boot/dts/microchip/mpfs.dtsi | 24 +- drivers/fpga/Kconfig | 9 + drivers/fpga/Makefile | 1 + drivers/fpga/microchip-auto-update.c | 495 ++++++++++++++++++ drivers/soc/microchip/Kconfig | 1 + drivers/soc/microchip/mpfs-sys-controller.c | 33 +- include/soc/microchip/mpfs.h | 2 + 9 files changed, 586 insertions(+), 10 deletions(-) create mode 100644 drivers/fpga/microchip-auto-update.c -- 2.39.1
