Generic file system firmware loader DM

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@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2018 Intel Corporation <www.intel.com>
+ *
+ * SPDX-License-Identifier:    GPL-2.0
+ */
+
+Introduction
+------------
+This is file system firmware loader for U-Boot framework, which has very close
+to some Linux Firmware API. For the details of Linux Firmware API, you can refer
+to https://01.org/linuxgraphics/gfx-docs/drm/driver-api/firmware/index.html.
+
+File system firmware loader can be used to load whatever(firmware, image,
+and binary) from the storage device in file system format into target location
+such as memory, then consumer driver such as FPGA driver can program FPGA image
+from the target location into FPGA.
+
+To enable firmware loader driver model, CONFIG_FS_LOADER need to be set at
+<board_name>_defconfig such as "CONFIG_FS_LOADER=y".
+
+Firmware Loader API core features
+---------------------------------
+=> Firmware storage device described in device tree source
+   ----------------------------------------
+   =>	Example of default storage device partition search set for mmc, usb,
+	sata and ubi as shown in below:
+	Example for mmc:
+	fs_loader {
+		u-boot,dm-pre-reloc;
+		compatible = "fs_loader";
+		storage_device = "mmc";
+		devpart = "0:1";
+	};
+
+	Example for usb:
+	fs_loader {
+		u-boot,dm-pre-reloc;
+		compatible = "fs_loader";
+		storage_device = "usb";
+		devpart = "0:1";
+	};
+
+	Example for sata:
+	fs_loader {
+		u-boot,dm-pre-reloc;
+		compatible = "fs_loader";
+		storage_device = "sata";
+		devpart = "0:1";
+	};
+
+	Example for ubi:
+	fs_loader {
+		u-boot,dm-pre-reloc;
+		compatible = "fs_loader";
+		storage_device = "ubi";
+		mtdpart = "UBI",
+		ubivol = "ubi0";
+	};
+
+
+	However, the default fs_loader with property devpart, mtdpart, and
+	ubivol values can be overwritten with value which is defined in the
+	environment variable "fw_dev_part", "fw_ubi_mtdpart", and
+	"fw_ubi_volume" respectively.
+	For example: env_set("fw_dev_part", "0:2");
+
+File system firmware Loader API
+-------------------------------
+=> int request_firmware_into_buf(struct udevice *dev,
+				 struct firmware **firmware_p,
+				 const char *name,
+				 void *buf, size_t size, u32 offset)
+   -----------------------------------------------------------------
+   =>	Load firmware into a previously allocated buffer
+
+	Parameters:
+	struct udevice *dev
+		An instance of a driver
+
+	struct firmware **firmware_p
+		pointer to firmware image
+
+	const char *name
+		name of firmware file
+
+	void *buf
+		address of buffer to load firmware into
+
+	size_t size
+		size of buffer
+
+	u32 offset
+		offset of a file for start reading into buffer
+
+	return: size of total read
+		-ve when error
+
+	Description:
+	The firmware is loaded directly into the buffer pointed to by buf and
+	the @firmware_p data member is pointed at buf.

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+File system firmware loader
+
+Required properties:
+- compatible: should contain "fs_loader"
+- storage_device: which storage device loading from, could be:
+		  - mmc, usb, sata, and ubi.
+- devpart: which storage device and partition the image loading from,
+	   this property is required for mmc, usb and sata.
+- mdtpart: which partition of ubi the image loading from, this property is
+	   required for ubi.
+- ubivol: which volume of ubi the image loading from, this proprety is required
+	  for ubi.
+
+=> Example of default storage device partition search set for mmc, usb, sata and
+ubi in device tree source as shown in below:
+
+Example for mmc:
+fs_loader {
+	u-boot,dm-pre-reloc;
+	compatible = "fs_loader";
+	storage_device = "mmc";
+	devpart = "0:1";
+};
+
+Example for usb:
+fs_loader {
+	u-boot,dm-pre-reloc;
+	compatible = "fs_loader";
+	storage_device = "usb";
+	devpart = "0:1";
+};
+
+Example for sata:
+fs_loader {
+	u-boot,dm-pre-reloc;
+	compatible = "fs_loader";
+	storage_device = "sata";
+	devpart = "0:1";
+};
+
+Example for ubi:
+fs_loader {
+	u-boot,dm-pre-reloc;
+	compatible = "fs_loader";
+	storage_device = "ubi";
+	mtdpart = "UBI",
+	ubivol = "ubi0";
+};

index be900cf..59f716b 100644
@@ -268,4 +268,15 @@ config GDSYS_RXAUI_CTRL
 	depends on MISC
 	help
 	  Support gdsys FPGA's RXAUI control.
+
+config FS_LOADER
+	bool "Enable loader driver for file system"
+	depends on DM
+	help
+	  This is file system generic loader which can be used to load
+	  the file image from the storage into target such as memory.
+
+	  The consumer driver would then use this loader to program whatever,
+	  ie. the FPGA device.
+
 endmenu

index e362609..74364a0 100644
@@ -53,3 +53,4 @@ obj-$(CONFIG_ROCKCHIP_EFUSE) += rockchip-efuse.o
 obj-$(CONFIG_STM32_RCC) += stm32_rcc.o
 obj-$(CONFIG_SYS_DPAA_QBMAN) += fsl_portals.o
 obj-$(CONFIG_GDSYS_RXAUI_CTRL) += gdsys_rxaui_ctrl.o
+obj-$(CONFIG_FS_LOADER) += fs_loader.o