[PATCH v1 0/6] PolarFire SoC Auto Update Support

Conor Dooley
2023-02-17T16:41:03Z

From: Conor Dooley <conor.dooley@microchip.com>

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@kernel.org/

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@microchip.com>
CC: Daire McNamara <daire.mcnamara@microchip.com>
CC: Rob Herring <robh+dt@kernel.org>
CC: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
CC: Moritz Fischer <mdf@kernel.org>
CC: Wu Hao <hao.wu@intel.com>
CC: Xu Yilun <yilun.xu@intel.com>
CC: Tom Rix <trix@redhat.com>
CC: linux-riscv@lists.infradead.org
CC: devicetree@vger.kernel.org
CC: linux-kernel@vger.kernel.org
CC: linux-fpga@vger.kernel.org

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