drivers/disk: Add NVMe controller support

Based on FreeBSD's implementation made by James Harris, Intel Copyright
2012-2016.

Since Zephyr does not propose any advanced interfaces as FreeBSD (bus
abstractions, memory and DMA abstraction and many more), this comes with
a much simplified and Zephyr-ish way to instanciate, initialize and use
NVMe controller.

ToDo: IO Queues cannot be more than 1. Macros will need to be improved to
manage the case of 2+ IO queues.

Signed-off-by: Tomasz Bursztyka <[email protected]>

Author: Tomasz Bursztyka

drivers/disk/CMakeLists.txt

@@ -12,4 +12,6 @@ zephyr_library_sources_ifdef(CONFIG_SDMMC_STM32 sdmmc_stm32.c)
 zephyr_library_sources_ifdef(CONFIG_SDMMC_SUBSYS sdmmc_subsys.c)
 zephyr_library_sources_ifdef(CONFIG_MMC_SUBSYS mmc_subsys.c)
 
+add_subdirectory_ifdef(CONFIG_NVME nvme)
+
 endif()

drivers/disk/Kconfig

@@ -13,4 +13,6 @@ source "drivers/disk/Kconfig.flash"
 source "drivers/disk/Kconfig.sdmmc"
 source "drivers/disk/Kconfig.mmc"
 
+rsource "nvme/Kconfig"
+
 endif # DISK_DRIVERS

drivers/disk/nvme/CMakeLists.txt

@@ -0,0 +1,4 @@
+# Copyright (c) 2022 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_library_sources(nvme_controller.c)

drivers/disk/nvme/Kconfig

@@ -0,0 +1,50 @@
+# Copyright (c) 2022 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+menuconfig NVME
+	bool "NVMe disk"
+	depends on PCIE
+	select PCIE_MSI_X
+	select PCIE_MSI_MULTI_VECTOR
+	help
+	  NVMe disk(s) might be present on the system through PCIe, enable this
+	  driver to support these. It will enable MSI-X and MSI multi-vector
+	  support
+
+if NVME
+
+config NVME_ADMIN_ENTRIES
+	int "Number of admin queue entries"
+	range 2 4096
+	default 256
+	help
+	  This sets the amount of allocated admin queue entries.
+	  Do not touch this unless you know what you are doing.
+
+config NVME_IO_QUEUES
+	int "Number of IO queues"
+	range 1 65536
+	default 1
+	help
+	  This sets the amount of allocated I/O queues.
+	  Do not touch this unless you know what you are doing.
+
+config NVME_IO_ENTRIES
+	int "Number of IO queue entries"
+	range 2 65536
+	default 256
+	help
+	  This sets the amount of allocated IO queue entries.
+	  Do not touch this unless you know what you are doing.
+
+config NVME_INT_PRIORITY
+	int "Interrupt priority"
+	default 2
+	help
+	  Interrupt priority used for the MSI-X generated interrupts.
+
+module = NVME
+module-str = nvme
+source "subsys/logging/Kconfig.template.log_config"
+
+endif # NVME