#!/bin/sh

BOOTPART_SIZE=
BOOTDEV_TYPE=unset

program_spi_partition() {
    local partname="$1"
    local part_offset="$2"
    local part_size="$3"
    local part_file="$4"
    local file_size=0

    if [ -n "$part_file" ]; then
	file_size=$(stat -c "%s" "$part_file")
	if [ -z "$file_size" ]; then
	    echo "ERR: could not retrieve file size of $part_file" >&2
	    return 1
	fi
    fi
    if [ $file_size -ne 0 ]; then
	echo "Writing $part_file (size=$file_size) to $partname (offset=$part_offset)"
	if ! mtd_debug write @MTD_DEV@ $part_offset $file_size "$part_file"; then
	    return 1
	fi
    fi
    # Multiple copies of the BCT get installed at erase-block boundaries
    # within the defined BCT partition
    if [ "$partname" = "BCT" ]; then
	local slotsize=16384
	local rounded_slot_size=$(expr \( \( $slotsize \+ 511 \) / 512 \) \* 512)
	local curr_offset=$(expr $part_offset \+ $rounded_slot_size)
	local copycount=$(expr $part_size / $rounded_slot_size)
	local i=1
	while [ $i -lt $copycount ]; do
	    echo "Writing $part_file to BCT+$i (offset=$curr_offset)"
	    if ! mtd_debug write @MTD_DEV@ $curr_offset $file_size "$part_file"; then
		return 1
	    fi
	    i=$(expr $i \+ 1)
	    curr_offset=$(expr $curr_offset \+ $rounded_slot_size)
	done
    fi
    return 0
}

program_mmcboot_partition() {
    local partname="$1"
    local part_offset="$2"
    local part_size="$3"
    local part_file="$4"
    local file_size=0
    local bootpart="/dev/mmcblk0boot0"

    if [ -z "$BOOTPART_SIZE" ]; then
	echo "ERR: boot partition size not set" >&2
	return 1
    fi
    if [ $part_offset -ge $BOOTPART_SIZE ]; then
	part_offset=$(expr $part_offset - $BOOTPART_SIZE)
	bootpart="/dev/mmcblk0boot1"
    fi
    if [ -n "$part_file" ]; then
	file_size=$(stat -c "%s" "$part_file")
	if [ -z "$file_size" ]; then
	    echo "ERR: could not retrieve file size of $part_file" >&2
	    return 1
	fi
    fi
    if [ $file_size -ne 0 ]; then
	echo "Writing $part_file (size=$file_size) to $partname on $bootpart (offset=$part_offset)"
	if ! dd if="$part_file" of="$bootpart" bs=1 seek=$part_offset count=$file_size > /dev/null; then
	    return 1
	fi
	# Multiple copies of the BCT get installed at 16KiB boundaries
	# within the defined BCT partition
	if [ "$partname" = "BCT" ]; then
	    local slotsize=16384
	    local curr_offset=$(expr $part_offset \+ $slotsize)
	    local copycount=$(expr $part_size / $slotsize)
	    local i=1
	    while [ $i -lt $copycount ]; do
		echo "Writing $part_file (size=$file_size) to BCT+$i (offset=$curr_offset)"
		if ! dd if="$part_file" of="$bootpart" bs=1 seek=$curr_offset count=$file_size > /dev/null; then
		    return 1
		fi
		i=$(expr $i \+ 1)
		curr_offset=$(expr $curr_offset \+ $slotsize)
	    done
	fi
    fi
    return 0
}

program_boot_partitions() {
    local blpkgdir="$1"
    local partname part_offset part_size part_file
    local rc=0

    if [ -z "$blpkgdir" -o ! -d "$blpkgdir" ]; then
	echo "ERR: missing or non-directory: $blpkgdir" >&2
	return 1
    fi
    if [ -f "$blpkgdir/boot_device_type" ]; then
	BOOTDEV_TYPE=$(cat "$blpkgdir/boot_device_type")
    else
	echo "ERR: missing boot_device_type file in $blpkgdir" >&2
	return 1
    fi
    if [ ! -f "$blpkgdir/partitions.conf" ]; then
	echo "ERR: partition config missing in $blpkgdir" >&2
	return 1
    fi

    if [ "$BOOTDEV_TYPE" = "mmcboot" ]; then
	if [ ! -b /dev/mmcblk0boot0 -o ! -b /dev/mmcblk0boot1 ]; then
	    echo "ERR: eMMC boot device, but mmcblk0bootX devices do not exist" >&2
	    return 1
	fi
	BOOTPART_SIZE=$(expr $(cat /sys/block/mmcblk0boot0/size) \* 512)
	echo "0" > /sys/block/mmcblk0boot0/force_ro
	echo "0" > /sys/block/mmcblk0boot1/force_ro
	blkdiscard -f /dev/mmcblk0boot0
	blkdiscard -f /dev/mmcblk0boot1
    elif [ "$BOOTDEV_TYPE" = "spi" ]; then
	if [ ! -e @MTD_DEV@ ]; then
	    echo "ERR: SPI boot device, but @MTD_DEV@ device does not exist" >&2
	    return 1
	fi
	echo "Erasing @MTD_DEV@"
	flash_erase @MTD_DEV@ 0 0
    else
	echo "ERR: unknown boot device type: $BOOTDEV_TYPE" >&2
	return 1
    fi

    oldwd="$PWD"
    cd "$blpkgdir"

    while IFS=":" read partname part_offset part_size part_file; do
	if [ "$BOOTDEV_TYPE" = "spi" ]; then
 	    if ! program_spi_partition "$partname" "$part_offset" "$part_size" "$part_file"; then
		rc=1
		break
	    fi
	elif [ "$BOOTDEV_TYPE" = "mmcboot" ]; then
	    if ! program_mmcboot_partition "$partname" "$part_offset" "$part_size" "$part_file"; then
		rc=1
		break
	    fi
	fi
    done < partitions.conf
    if [ "$BOOTDEV_TYPE" = "mmcboot" ]; then
	echo "1" > /sys/block/mmcblk0boot0/force_ro
	echo "1" > /sys/block/mmcblk0boot1/force_ro
    fi
    cd "$oldwd"
    return $rc
}

program_boot_partitions "$@"