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 init/release callbacks. There the reset and clocks are handled. the callbacks are called respectively on vfio_platform_init/release_common(). 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-v2 The qemu series to test with can be found at https://github.com/eauger/qemu/tree/tegra234-mgbe-rfc Best Regards Eric --- History: v1 -> v2: - rename reset_ops into of_reset_ops - Move region initialization to vfio_platform_init_common - Use init/release of_reset_ops callbacks instead of open/close Eric Auger (6): vfio_platform: Introduce vfio_platform_get_region helper vfio_platform: reset: Prepare for additional reset ops vfio-platform: Move region initialization to vfio_platform_init_common vfio_platform: reset: Introduce new init and release 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 | 234 ++++++++++++++++++ drivers/vfio/platform/vfio_platform_common.c | 88 +++++-- drivers/vfio/platform/vfio_platform_private.h | 43 +++- 7 files changed, 349 insertions(+), 39 deletions(-) create mode 100644 drivers/vfio/platform/reset/vfio_platform_tegra234_mgbe.c -- 2.41.0
