We introduce a new vfio platform reset module for the tegra234 Multi-Gigabit Ethernet (MGBE). This reset driver is more complex than previous ones because some resources need to be prepared and released (clocks and reset). The existing infrastructure was too simplistic to do that. So this series extends the original single reset function to an ops struct enhanced with optional open/close callbacks. There the reset and clocks are handled. the functions are called on open_device/close_device callback. That's questionable whether this should be called in init/release instead but memory regions cannot be ioremapped at that time since vfio_platform_regions_init is called on .opendevice. The actual reset toggles the mac reset, disable mac interrupts, stop DMA requests and do a SW reset. The reset code is inspired of the native driver: net/ethernet/stmicro/stmmac/dwxgmac2_dma.c and net/ethernet/stmicro/stmmac/dwmac-tegra.c This series can be found at: https://github.com/eauger/linux/tree/tegra234-mgbe-reset-module-rfc The qemu series to test with can be found at https://github.com/eauger/qemu/tree/tegra234-mgbe-rfc Best Regards Eric Eric Auger (5): vfio_platform: Introduce vfio_platform_get_region helper vfio_platform: reset: Prepare for additional reset ops vfio_platform: reset: Introduce new open and close callbacks vfio-platform: Add a new handle to store reset data vfio/platform: Add tegra234-mgbe vfio platform reset module drivers/vfio/platform/reset/Kconfig | 7 + drivers/vfio/platform/reset/Makefile | 2 + .../platform/reset/vfio_platform_amdxgbe.c | 7 +- .../reset/vfio_platform_calxedaxgmac.c | 7 +- .../reset/vfio_platform_tegra234_mgbe.c | 245 ++++++++++++++++++ drivers/vfio/platform/vfio_platform_common.c | 78 ++++-- drivers/vfio/platform/vfio_platform_private.h | 43 ++- 7 files changed, 358 insertions(+), 31 deletions(-) create mode 100644 drivers/vfio/platform/reset/vfio_platform_tegra234_mgbe.c -- 2.41.0
