--- /dev/null
+From 6173a065cb395d4a9528c4e49810af127db68141 Mon Sep 17 00:00:00 2001
+From: Daniel Golle <daniel@makrotopia.org>
+Date: Wed, 16 Nov 2022 12:49:52 +0000
+Subject: [PATCH 1/2] block: add uImage.FIT subimage block driver
+
+Add a small block driver which exposes filesystem sub-images contained
+in U-Boot uImage.FIT images as block devices.
+
+The uImage.FIT image has to be stored directly on a block device or
+partition, MTD device or partition, or UBI volume.
+
+The driver is intended for systems using the U-Boot bootloader and
+uses the root device hint left by the bootloader (or the user) in
+the 'chosen' section of the device-tree.
+
+Example:
+/dts-v1/;
+/ {
+ chosen {
+ rootdisk = <&mmc0_part3>;
+ };
+};
+
+Signed-off-by: Daniel Golle <daniel@makrotopia.org>
+---
+ MAINTAINERS | 6 +
+ drivers/block/Kconfig | 12 +
+ drivers/block/Makefile | 2 +
+ drivers/block/fitblk.c | 658 ++++++++++++++++++++++++++++++++++++
+ drivers/block/open | 4 +
+ include/uapi/linux/fitblk.h | 10 +
+ 6 files changed, 692 insertions(+)
+ create mode 100644 drivers/block/fitblk.c
+ create mode 100644 drivers/block/open
+ create mode 100644 include/uapi/linux/fitblk.h
+
+--- a/MAINTAINERS
++++ b/MAINTAINERS
+@@ -21052,6 +21052,12 @@ F: Documentation/filesystems/ubifs-authe
+ F: Documentation/filesystems/ubifs.rst
+ F: fs/ubifs/
+
++U-BOOT UIMAGE.FIT PARSER
++M: Daniel Golle <daniel@makrotopia.org>
++L: linux-block@vger.kernel.org
++S: Maintained
++F: drivers/block/fitblk.c
++
+ UBLK USERSPACE BLOCK DRIVER
+ M: Ming Lei <ming.lei@redhat.com>
+ L: linux-block@vger.kernel.org
+--- a/drivers/block/Kconfig
++++ b/drivers/block/Kconfig
+@@ -383,6 +383,18 @@ config VIRTIO_BLK
+ This is the virtual block driver for virtio. It can be used with
+ QEMU based VMMs (like KVM or Xen). Say Y or M.
+
++config UIMAGE_FIT_BLK
++ bool "uImage.FIT block driver"
++ help
++ This driver allows using filesystems contained in uImage.FIT images
++ by mapping them as block devices.
++
++ It can currently not be built as a module due to libfdt symbols not
++ being exported.
++
++ Say Y if you want to mount filesystems sub-images of a uImage.FIT
++ stored in a block device partition, mtdblock or ubiblock device.
++
+ config BLK_DEV_RBD
+ tristate "Rados block device (RBD)"
+ depends on INET && BLOCK
+--- a/drivers/block/Makefile
++++ b/drivers/block/Makefile
+@@ -39,4 +39,6 @@ obj-$(CONFIG_BLK_DEV_NULL_BLK) += null_b
+
+ obj-$(CONFIG_BLK_DEV_UBLK) += ublk_drv.o
+
++obj-$(CONFIG_UIMAGE_FIT_BLK) += fitblk.o
++
+ swim_mod-y := swim.o swim_asm.o
+--- /dev/null
++++ b/drivers/block/fitblk.c
+@@ -0,0 +1,635 @@
++// SPDX-License-Identifier: GPL-2.0-only
++/*
++ * uImage.FIT virtual block device driver.
++ *
++ * Copyright (C) 2023 Daniel Golle
++ * Copyright (C) 2007 Nick Piggin
++ * Copyright (C) 2007 Novell Inc.
++ *
++ * Initially derived from drivers/block/brd.c which is in parts derived from
++ * drivers/block/rd.c, and drivers/block/loop.c, copyright of their respective
++ * owners.
++ *
++ * uImage.FIT headers extracted from Das U-Boot
++ * (C) Copyright 2008 Semihalf
++ * (C) Copyright 2000-2005
++ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
++ */
++
++#include <linux/init.h>
++#include <linux/initrd.h>
++#include <linux/module.h>
++#include <linux/moduleparam.h>
++#include <linux/major.h>
++#include <linux/blkdev.h>
++#include <linux/blkpg.h>
++#include <linux/blk-mq.h>
++#include <linux/ctype.h>
++#include <linux/hdreg.h>
++#include <linux/list.h>
++#include <linux/mutex.h>
++#include <linux/of.h>
++#include <linux/of_device.h>
++#include <linux/of_fdt.h>
++#include <linux/pagemap.h>
++#include <linux/platform_device.h>
++#include <linux/property.h>
++#include <linux/refcount.h>
++#include <linux/task_work.h>
++#include <linux/types.h>
++#include <linux/libfdt.h>
++#include <linux/mtd/mtd.h>
++#include <linux/root_dev.h>
++#include <uapi/linux/fitblk.h>
++
++#define FIT_DEVICE_PREFIX "fit"
++
++/* maximum number of pages used for the uImage.FIT index structure */
++#define FIT_MAX_PAGES 1024
++
++/* minimum free sectors to map as read-write "remainder" volume */
++#define MIN_FREE_SECT 16
++
++/* maximum number of mapped loadables */
++#define MAX_FIT_LOADABLES 16
++
++/* constants for uImage.FIT structrure traversal */
++#define FIT_IMAGES_PATH "/images"
++#define FIT_CONFS_PATH "/configurations"
++
++/* hash/signature/key node */
++#define FIT_HASH_NODENAME "hash"
++#define FIT_ALGO_PROP "algo"
++#define FIT_VALUE_PROP "value"
++#define FIT_IGNORE_PROP "uboot-ignore"
++#define FIT_SIG_NODENAME "signature"
++#define FIT_KEY_REQUIRED "required"
++#define FIT_KEY_HINT "key-name-hint"
++
++/* cipher node */
++#define FIT_CIPHER_NODENAME "cipher"
++#define FIT_ALGO_PROP "algo"
++
++/* image node */
++#define FIT_DATA_PROP "data"
++#define FIT_DATA_POSITION_PROP "data-position"
++#define FIT_DATA_OFFSET_PROP "data-offset"
++#define FIT_DATA_SIZE_PROP "data-size"
++#define FIT_TIMESTAMP_PROP "timestamp"
++#define FIT_DESC_PROP "description"
++#define FIT_ARCH_PROP "arch"
++#define FIT_TYPE_PROP "type"
++#define FIT_OS_PROP "os"
++#define FIT_COMP_PROP "compression"
++#define FIT_ENTRY_PROP "entry"
++#define FIT_LOAD_PROP "load"
++
++/* configuration node */
++#define FIT_KERNEL_PROP "kernel"
++#define FIT_FILESYSTEM_PROP "filesystem"
++#define FIT_RAMDISK_PROP "ramdisk"
++#define FIT_FDT_PROP "fdt"
++#define FIT_LOADABLE_PROP "loadables"
++#define FIT_DEFAULT_PROP "default"
++#define FIT_SETUP_PROP "setup"
++#define FIT_FPGA_PROP "fpga"
++#define FIT_FIRMWARE_PROP "firmware"
++#define FIT_STANDALONE_PROP "standalone"
++
++/* fitblk driver data */
++static const char *_fitblk_claim_ptr = "I belong to fitblk";
++static const char *ubootver;
++struct device_node *rootdisk;
++static struct platform_device *pdev;
++static LIST_HEAD(fitblk_devices);
++static DEFINE_MUTEX(devices_mutex);
++refcount_t num_devs;
++
++struct fitblk {
++ struct platform_device *pdev;
++ struct block_device *lower_bdev;
++ sector_t start_sect;
++ struct gendisk *disk;
++ struct work_struct remove_work;
++ struct list_head list;
++ bool dead;
++};
++
++static int fitblk_open(struct block_device *bdev, fmode_t mode)
++{
++ struct fitblk *fitblk = bdev->bd_disk->private_data;
++
++ if (fitblk->dead)
++ return -ENOENT;
++
++ return 0;
++}
++
++static void fitblk_release(struct gendisk *disk, fmode_t mode)
++{
++ return;
++}
++
++static void fitblk_submit_bio(struct bio *orig_bio)
++{
++ struct bio *bio = orig_bio;
++ struct fitblk *fitblk = bio->bi_bdev->bd_disk->private_data;
++
++ if (fitblk->dead)
++ return;
++
++ /* mangle bio and re-submit */
++ while (bio) {
++ bio->bi_iter.bi_sector += fitblk->start_sect;
++ bio->bi_bdev = fitblk->lower_bdev;
++ bio = bio->bi_next;
++ }
++ submit_bio(orig_bio);
++}
++
++static void fitblk_remove(struct fitblk *fitblk)
++{
++ blk_mark_disk_dead(fitblk->disk);
++ mutex_lock(&devices_mutex);
++ fitblk->dead = true;
++ list_del(&fitblk->list);
++ mutex_unlock(&devices_mutex);
++
++ schedule_work(&fitblk->remove_work);
++}
++
++static int fitblk_ioctl(struct block_device *bdev, fmode_t mode,
++ unsigned int cmd, unsigned long arg)
++{
++ struct fitblk *fitblk = bdev->bd_disk->private_data;
++
++ if (!capable(CAP_SYS_ADMIN))
++ return -EACCES;
++
++ if (fitblk->dead)
++ return -ENOENT;
++
++ switch (cmd) {
++ case FITBLK_RELEASE:
++ fitblk_remove(fitblk);
++ break;
++ default:
++ return -EINVAL;
++ }
++
++ return 0;
++}
++
++static const struct block_device_operations fitblk_fops = {
++ .owner = THIS_MODULE,
++ .ioctl = fitblk_ioctl,
++ .open = fitblk_open,
++ .release = fitblk_release,
++ .submit_bio = fitblk_submit_bio,
++};
++
++static void fitblk_purge(struct work_struct *work)
++{
++ struct fitblk *fitblk = container_of(work, struct fitblk, remove_work);
++
++ //del_gendisk(fitblk->disk); // causes crash, not doing it doesn't matter
++ refcount_dec(&num_devs);
++ platform_device_del(fitblk->pdev);
++ platform_device_put(fitblk->pdev);
++
++ if (refcount_dec_if_one(&num_devs)) {
++ sysfs_remove_link(&pdev->dev.kobj, "lower_dev");
++ blkdev_put(fitblk->lower_bdev, FMODE_READ | FMODE_EXCL);
++ }
++
++ kfree(fitblk);
++}
++
++static int add_fit_subimage_device(struct block_device *lower_bdev,
++ unsigned int slot, sector_t start_sect,
++ sector_t nr_sect, bool readonly)
++{
++ struct fitblk *fitblk;
++ struct gendisk *disk;
++ int err;
++
++ mutex_lock(&devices_mutex);
++ if (!refcount_inc_not_zero(&num_devs))
++ return -EBADF;
++
++ fitblk = kzalloc(sizeof(struct fitblk), GFP_KERNEL);
++ if (!fitblk) {
++ err = -ENOMEM;
++ goto out_unlock;
++ }
++
++ fitblk->lower_bdev = lower_bdev;
++ fitblk->start_sect = start_sect;
++ INIT_WORK(&fitblk->remove_work, fitblk_purge);
++
++ disk = blk_alloc_disk(NUMA_NO_NODE);
++ if (!disk) {
++ err = -ENOMEM;
++ goto out_free_fitblk;
++ }
++
++ disk->first_minor = 0;
++ disk->flags = lower_bdev->bd_disk->flags | GENHD_FL_NO_PART;
++ disk->fops = &fitblk_fops;
++ disk->private_data = fitblk;
++ if (readonly) {
++ set_disk_ro(disk, 1);
++ snprintf(disk->disk_name, sizeof(disk->disk_name), FIT_DEVICE_PREFIX "%u", slot);
++ } else {
++ strcpy(disk->disk_name, FIT_DEVICE_PREFIX "rw");
++ }
++
++ set_capacity(disk, nr_sect);
++
++ disk->queue->queue_flags = lower_bdev->bd_disk->queue->queue_flags;
++ memcpy(&disk->queue->limits, &lower_bdev->bd_disk->queue->limits,
++ sizeof(struct queue_limits));
++
++ fitblk->disk = disk;
++ fitblk->pdev = platform_device_alloc(disk->disk_name, PLATFORM_DEVID_NONE);
++ if (!fitblk->pdev) {
++ err = -ENOMEM;
++ goto out_cleanup_disk;
++ }
++
++ fitblk->pdev->dev.parent = &pdev->dev;
++ err = platform_device_add(fitblk->pdev);
++ if (err)
++ goto out_put_pdev;
++
++ err = device_add_disk(&fitblk->pdev->dev, disk, NULL);
++ if (err)
++ goto out_del_pdev;
++
++ if (!ROOT_DEV)
++ ROOT_DEV = disk->part0->bd_dev;
++
++ list_add_tail(&fitblk->list, &fitblk_devices);
++
++ mutex_unlock(&devices_mutex);
++
++ return 0;
++
++out_del_pdev:
++ platform_device_del(fitblk->pdev);
++out_put_pdev:
++ platform_device_put(fitblk->pdev);
++out_cleanup_disk:
++ put_disk(disk);
++out_free_fitblk:
++ kfree(fitblk);
++out_unlock:
++ refcount_dec(&num_devs);
++ mutex_unlock(&devices_mutex);
++ return err;
++}
++
++static int parse_fit_on_dev(struct device *dev)
++{
++ struct block_device *bdev;
++ struct address_space *mapping;
++ struct folio *folio;
++ pgoff_t f_index = 0;
++ size_t bytes_left, bytes_to_copy;
++ void *pre_fit, *fit, *fit_c;
++ u64 dsize, dsectors, imgmaxsect = 0;
++ u32 size, image_pos, image_len;
++ const __be32 *image_offset_be, *image_len_be, *image_pos_be;
++ int ret = 0, node, images, config;
++ const char *image_name, *image_type, *image_description,
++ *config_default, *config_description, *config_loadables;
++ u32 image_name_len, image_type_len, image_description_len,
++ bootconf_len, config_default_len, config_description_len,
++ config_loadables_len;
++ sector_t start_sect, nr_sects;
++ struct device_node *np = NULL;
++ const char *bootconf_c;
++ const char *loadable;
++ char *bootconf = NULL, *bootconf_term;
++ bool found;
++ int loadables_rem_len, loadable_len;
++ u16 loadcnt;
++ unsigned int slot = 0;
++
++ /* Exclusive open the block device to receive holder notifications */
++ bdev = blkdev_get_by_dev(dev->devt, FMODE_READ | FMODE_EXCL, &_fitblk_claim_ptr);
++ if (!bdev)
++ return -ENODEV;
++
++ if (IS_ERR(bdev))
++ return PTR_ERR(bdev);
++
++ mapping = bdev->bd_inode->i_mapping;
++
++ /* map first page */
++ folio = read_mapping_folio(mapping, f_index++, NULL);
++ if (IS_ERR(folio)) {
++ ret = PTR_ERR(folio);
++ goto out_blkdev;
++ }
++ pre_fit = folio_address(folio) + offset_in_folio(folio, 0);
++
++ /* uImage.FIT is based on flattened device tree structure */
++ if (fdt_check_header(pre_fit)) {
++ ret = -EINVAL;
++ folio_put(folio);
++ goto out_blkdev;
++ }
++
++ size = fdt_totalsize(pre_fit);
++
++ if (size > PAGE_SIZE * FIT_MAX_PAGES) {
++ ret = -EOPNOTSUPP;
++ folio_put(folio);
++ goto out_blkdev;
++ }
++
++ /* acquire disk size */
++ dsectors = bdev_nr_sectors(bdev);
++ dsize = dsectors << SECTOR_SHIFT;
++
++ /* abort if FIT structure is larger than disk or partition size */
++ if (size >= dsize) {
++ ret = -EFBIG;
++ folio_put(folio);
++ goto out_blkdev;
++ }
++
++ fit = kmalloc(size, GFP_KERNEL);
++ if (!fit) {
++ ret = -ENOMEM;
++ folio_put(folio);
++ goto out_blkdev;
++ }
++
++ bytes_left = size;
++ fit_c = fit;
++ while (bytes_left > 0) {
++ bytes_to_copy = min(bytes_left, folio_size(folio) - offset_in_folio(folio, 0));
++ memcpy(fit_c, pre_fit, bytes_to_copy);
++ fit_c += bytes_to_copy;
++ bytes_left -= bytes_to_copy;
++ if (bytes_left) {
++ folio_put(folio);
++ folio = read_mapping_folio(mapping, f_index++, NULL);
++ if (IS_ERR(folio)) {
++ ret = PTR_ERR(folio);
++ goto out_blkdev;
++ };
++ pre_fit = folio_address(folio) + offset_in_folio(folio, 0);
++ }
++ }
++ folio_put(folio);
++
++ /* set boot config node name U-Boot may have added to the device tree */
++ np = of_find_node_by_path("/chosen");
++ if (np) {
++ bootconf_c = of_get_property(np, "u-boot,bootconf", &bootconf_len);
++ if (bootconf_c && bootconf_len)
++ bootconf = kmemdup_nul(bootconf_c, bootconf_len, GFP_KERNEL);
++ }
++
++ if (bootconf) {
++ bootconf_term = strchr(bootconf, '#');
++ if (bootconf_term)
++ *bootconf_term = '\0';
++ }
++
++ /* find configuration path in uImage.FIT */
++ config = fdt_path_offset(fit, FIT_CONFS_PATH);
++ if (config < 0) {
++ pr_err("FIT: Cannot find %s node: %d\n",
++ FIT_CONFS_PATH, config);
++ ret = -ENOENT;
++ goto out_bootconf;
++ }
++
++ /* get default configuration node name */
++ config_default =
++ fdt_getprop(fit, config, FIT_DEFAULT_PROP, &config_default_len);
++
++ /* make sure we got either default or selected boot config node name */
++ if (!config_default && !bootconf) {
++ pr_err("FIT: Cannot find default configuration\n");
++ ret = -ENOENT;
++ goto out_bootconf;
++ }
++
++ /* find selected boot config node, fallback on default config node */
++ node = fdt_subnode_offset(fit, config, bootconf ?: config_default);
++ if (node < 0) {
++ pr_err("FIT: Cannot find %s node: %d\n",
++ bootconf ?: config_default, node);
++ ret = -ENOENT;
++ goto out_bootconf;
++ }
++
++ pr_info("FIT: Detected U-Boot %s\n", ubootver);
++
++ /* get selected configuration data */
++ config_description =
++ fdt_getprop(fit, node, FIT_DESC_PROP, &config_description_len);
++ config_loadables = fdt_getprop(fit, node, FIT_LOADABLE_PROP,
++ &config_loadables_len);
++
++ pr_info("FIT: %s configuration: \"%.*s\"%s%.*s%s\n",
++ bootconf ? "Selected" : "Default",
++ bootconf ? bootconf_len : config_default_len,
++ bootconf ?: config_default,
++ config_description ? " (" : "",
++ config_description ? config_description_len : 0,
++ config_description ?: "",
++ config_description ? ")" : "");
++
++ if (!config_loadables || !config_loadables_len) {
++ pr_err("FIT: No loadables configured in \"%s\"\n",
++ bootconf ?: config_default);
++ ret = -ENOENT;
++ goto out_bootconf;
++ }
++
++ /* get images path in uImage.FIT */
++ images = fdt_path_offset(fit, FIT_IMAGES_PATH);
++ if (images < 0) {
++ pr_err("FIT: Cannot find %s node: %d\n", FIT_IMAGES_PATH, images);
++ ret = -EINVAL;
++ goto out_bootconf;
++ }
++
++ /* iterate over images in uImage.FIT */
++ fdt_for_each_subnode(node, fit, images) {
++ image_name = fdt_get_name(fit, node, &image_name_len);
++ image_type = fdt_getprop(fit, node, FIT_TYPE_PROP, &image_type_len);
++ image_offset_be = fdt_getprop(fit, node, FIT_DATA_OFFSET_PROP, NULL);
++ image_pos_be = fdt_getprop(fit, node, FIT_DATA_POSITION_PROP, NULL);
++ image_len_be = fdt_getprop(fit, node, FIT_DATA_SIZE_PROP, NULL);
++
++ if (!image_name || !image_type || !image_len_be ||
++ !image_name_len || !image_type_len)
++ continue;
++
++ image_len = be32_to_cpu(*image_len_be);
++ if (!image_len)
++ continue;
++
++ if (image_offset_be)
++ image_pos = be32_to_cpu(*image_offset_be) + size;
++ else if (image_pos_be)
++ image_pos = be32_to_cpu(*image_pos_be);
++ else
++ continue;
++
++ image_description = fdt_getprop(fit, node, FIT_DESC_PROP,
++ &image_description_len);
++
++ pr_info("FIT: %16s sub-image 0x%08x..0x%08x \"%.*s\"%s%.*s%s\n",
++ image_type, image_pos, image_pos + image_len - 1,
++ image_name_len, image_name, image_description ? " (" : "",
++ image_description ? image_description_len : 0,
++ image_description ?: "", image_description ? ") " : "");
++
++ /* only 'filesystem' images should be mapped as partitions */
++ if (strncmp(image_type, FIT_FILESYSTEM_PROP, image_type_len))
++ continue;
++
++ /* check if sub-image is part of configured loadables */
++ found = false;
++ loadable = config_loadables;
++ loadables_rem_len = config_loadables_len;
++ for (loadcnt = 0; loadables_rem_len > 1 &&
++ loadcnt < MAX_FIT_LOADABLES; ++loadcnt) {
++ loadable_len =
++ strnlen(loadable, loadables_rem_len - 1) + 1;
++ loadables_rem_len -= loadable_len;
++ if (!strncmp(image_name, loadable, loadable_len)) {
++ found = true;
++ break;
++ }
++ loadable += loadable_len;
++ }
++ if (!found)
++ continue;
++
++ if (image_pos % (1 << PAGE_SHIFT)) {
++ dev_err(dev, "FIT: image %.*s start not aligned to page boundaries, skipping\n",
++ image_name_len, image_name);
++ continue;
++ }
++
++ if (image_len % (1 << PAGE_SHIFT)) {
++ dev_err(dev, "FIT: sub-image %.*s end not aligned to page boundaries, skipping\n",
++ image_name_len, image_name);
++ continue;
++ }
++
++ start_sect = image_pos >> SECTOR_SHIFT;
++ nr_sects = image_len >> SECTOR_SHIFT;
++ imgmaxsect = max_t(sector_t, imgmaxsect, start_sect + nr_sects);
++
++ if (start_sect + nr_sects > dsectors) {
++ dev_err(dev, "FIT: sub-image %.*s disk access beyond EOD\n",
++ image_name_len, image_name);
++ continue;
++ }
++
++ if (!slot) {
++ ret = sysfs_create_link_nowarn(&pdev->dev.kobj, bdev_kobj(bdev), "lower_dev");
++ if (ret && ret != -EEXIST)
++ goto out_bootconf;
++
++ ret = 0;
++ }
++
++ add_fit_subimage_device(bdev, slot++, start_sect, nr_sects, true);
++ }
++
++ if (!found || !slot)
++ goto out_bootconf;
++
++ dev_info(dev, "mapped %u uImage.FIT filesystem sub-image%s as /dev/fit%s%u%s\n",
++ slot, (slot > 1)?"s":"", (slot > 1)?"[0...":"", slot - 1,
++ (slot > 1)?"]":"");
++
++ /* in case uImage.FIT is stored in a partition, map the remaining space */
++ if (!bdev->bd_read_only && bdev_is_partition(bdev) &&
++ (imgmaxsect + MIN_FREE_SECT) < dsectors) {
++ add_fit_subimage_device(bdev, slot++, imgmaxsect,
++ dsectors - imgmaxsect, false);
++ dev_info(dev, "mapped remaing space as /dev/fitrw\n");
++ }
++
++out_bootconf:
++ kfree(bootconf);
++ kfree(fit);
++out_blkdev:
++ if (!found || ret)
++ blkdev_put(bdev, FMODE_READ | FMODE_EXCL);
++
++ return ret;
++}
++
++static int fitblk_match_of_node(struct device *dev, const void *np)
++{
++ int ret;
++
++ ret = device_match_of_node(dev, np);
++ if (ret)
++ return ret;
++
++ /*
++ * To match ubiblock and mtdblock devices by their parent ubi
++ * or mtd device, also consider block device parent
++ */
++ if (!dev->parent)
++ return 0;
++
++ return device_match_of_node(dev->parent, np);
++}
++
++static int fitblk_probe(struct platform_device *pdev)
++{
++ struct device *dev;
++
++ dev = class_find_device(&block_class, NULL, rootdisk, fitblk_match_of_node);
++ if (!dev)
++ return -EPROBE_DEFER;
++
++ return parse_fit_on_dev(dev);
++}
++
++static struct platform_driver fitblk_driver = {
++ .probe = fitblk_probe,
++ .driver = {
++ .name = "fitblk",
++ .owner = THIS_MODULE,
++ },
++};
++
++static int __init fitblk_init(void)
++{
++ /* detect U-Boot firmware */
++ ubootver = of_get_property(of_chosen, "u-boot,version", NULL);
++ if (!ubootver)
++ return 0;
++
++ /* parse 'rootdisk' property phandle */
++ rootdisk = of_parse_phandle(of_chosen, "rootdisk", 0);
++ if (!rootdisk)
++ return 0;
++
++ if (platform_driver_register(&fitblk_driver))
++ return -ENODEV;
++
++ refcount_set(&num_devs, 1);
++ pdev = platform_device_register_simple("fitblk", -1, NULL, 0);
++ if (IS_ERR(pdev))
++ return PTR_ERR(pdev);
++
++ return 0;
++}
++device_initcall(fitblk_init);
+--- /dev/null
++++ b/include/uapi/linux/fitblk.h
+@@ -0,0 +1,10 @@
++/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
++#ifndef _UAPI_LINUX_FITBLK_H
++#define _UAPI_LINUX_FITBLK_H
++
++/*
++ * IOCTL commands --- we will commandeer 0x46 ('F')
++ */
++#define FITBLK_RELEASE 0x4600
++
++#endif /* _UAPI_LINUX_FITBLK_H */
projects / openwrt / staging / wigyori.git / commitdiff