ath79: Add support for Plasma Cloud PA300

Device specifications:

* Qualcomm/Atheros QCA9533 v2
* 650/600/217 MHz (CPU/DDR/AHB)
* 64 MB of RAM
* 16 MB of SPI NOR flash (mx25l12805d)
  - 2x 7 MB available; but one of the 7 MB regions is the recovery image
* 2x 10/100 Mbps Ethernet
* 2T2R 2.4 GHz Wi-Fi
* multi-color LED (controlled via red/green/blue GPIOs)
* 1x GPIO-button (reset)
* external h/w watchdog (enabled by default)
* TTL pins are on board (arrow points to VCC, then follows: GND, TX, RX)
* 2x fast ethernet
  - eth0
    + Label: Ethernet 1
    + 24V passive POE (mode B)
    + used as WAN interface
  - eth1
    + Label: Ethernet 2
    + 802.3af POE
    + builtin switch port 2
    + used as LAN interface
* 12-24V 1A DC
* internal antennas

Flashing instructions:

The tool ap51-flash (https://github.com/ap51-flash/ap51-flash) should be
used to transfer the factory image to the u-boot when the device boots up.

Signed-off-by: Sven Eckelmann <sven@narfation.org>

2 files changed, 111 insertions, 0 deletions

diff --git a/target/linux/ath79/generic/base-files/lib/upgrade/dualboot_datachk.sh b/target/linux/ath79/generic/base-files/lib/upgrade/dualboot_datachk.sh
new file mode 100644
index 0000000000..68733ccf15
--- /dev/null
+++ b/target/linux/ath79/generic/base-files/lib/upgrade/dualboot_datachk.sh
@@ -0,0 +1,104 @@
+# The U-Boot loader with the datachk patchset for dualbooting requires image
+# sizes and checksums to be provided in the U-Boot environment.
+# The devices come with 2 main partitions - while one is active
+# sysupgrade will flash the other. The boot order is changed to boot the
+# newly flashed partition. If the new partition can't be booted due to
+# upgrade failures the previously used partition is loaded.
+
+platform_do_upgrade_dualboot_datachk() {
+	local tar_file="$1"
+	local restore_backup
+	local primary_kernel_mtd
+
+	local setenv_script="/tmp/fw_env_upgrade"
+
+	local inactive_mtd="$(find_mtd_index $PART_NAME)"
+	local inactive_offset="$(cat /sys/class/mtd/mtd${inactive_mtd}/offset)"
+	local total_size="$(cat /sys/class/mtd/mtd${inactive_mtd}/size)"
+	local flash_start_mem=0x9f000000
+
+	# detect to which flash region the new image is written to.
+	#
+	# 1. check what is the mtd index for the first flash region on this
+	#    device
+	# 2. check if the target partition ("inactive") has the mtd index of
+	#    the first flash region
+	#
+	#    - when it is: the new bootseq will be 1,2 and the first region is
+	#      modified
+	#    - when it isnt: bootseq will be 2,1 and the second region is
+	#      modified
+	#
+	# The detection has to be done via the hardcoded mtd partition because
+	# the current boot might be done with the fallback region. Let us
+	# assume that the current bootseq is 1,2. The bootloader detected that
+	# the image in flash region 1 is corrupt and thus switches to flash
+	# region 2. The bootseq in the u-boot-env is now still the same and
+	# the sysupgrade code can now only rely on the actual mtd indexes and
+	# not the bootseq variable to detect the currently booted flash
+	# region/image.
+	#
+	# In the above example, an implementation which uses bootseq ("1,2") to
+	# detect the currently booted image would assume that region 1 is booted
+	# and then overwrite the variables for the wrong flash region (aka the
+	# one which isn't modified). This could result in a device which doesn't
+	# boot anymore to Linux until it was reflashed with ap51-flash.
+	local next_boot_part="1"
+	case "$(board_name)" in
+	plasmacloud,pa300)
+		primary_kernel_mtd=3
+		;;
+	*)
+		echo "failed to detect primary kernel mtd partition for board"
+		return 1
+		;;
+	esac
+	[ "$inactive_mtd" = "$primary_kernel_mtd" ] || next_boot_part="2"
+
+	local board_dir=$(tar tf $tar_file | grep -m 1 '^sysupgrade-.*/$')
+	board_dir=${board_dir%/}
+
+	local kernel_length=$(tar xf $tar_file ${board_dir}/kernel -O | wc -c)
+	local rootfs_length=$(tar xf $tar_file ${board_dir}/root -O | wc -c)
+	# rootfs without EOF marker
+	rootfs_length=$((rootfs_length-4))
+
+	local kernel_md5=$(tar xf $tar_file ${board_dir}/kernel -O | md5sum); kernel_md5="${kernel_md5%% *}"
+	# md5 checksum of rootfs with EOF marker
+	local rootfs_md5=$(tar xf $tar_file ${board_dir}/root -O | dd bs=1 count=$rootfs_length | md5sum); rootfs_md5="${rootfs_md5%% *}"
+
+	#
+	# add tar support to get_image() to use default_do_upgrade() instead?
+	#
+
+	# take care of restoring a saved config
+	[ -n "$UPGRADE_BACKUP" ] && restore_backup="${MTD_CONFIG_ARGS} -j ${UPGRADE_BACKUP}"
+
+	mtd -q erase inactive
+	tar xf $tar_file ${board_dir}/root -O | mtd -n -p $kernel_length $restore_backup write - $PART_NAME
+	tar xf $tar_file ${board_dir}/kernel -O | mtd -n write - $PART_NAME
+
+	# prepare new u-boot env
+	if [ "$next_boot_part" = "1" ]; then
+		echo "bootseq 1,2" > $setenv_script
+	else
+		echo "bootseq 2,1" > $setenv_script
+	fi
+
+	printf "kernel_size_%i %i\n" $next_boot_part $((kernel_length / 1024)) >> $setenv_script
+	printf "vmlinux_start_addr 0x%08x\n" $((flash_start_mem + inactive_offset)) >> $setenv_script
+	printf "vmlinux_size 0x%08x\n" ${kernel_length} >> $setenv_script
+	printf "vmlinux_checksum %s\n" ${kernel_md5} >> $setenv_script
+
+	printf "rootfs_size_%i %i\n" $next_boot_part $(((total_size-kernel_length) / 1024)) >> $setenv_script
+	printf "rootfs_start_addr 0x%08x\n" $((flash_start_mem+inactive_offset+kernel_length)) >> $setenv_script
+	printf "rootfs_size 0x%08x\n" ${rootfs_length} >> $setenv_script
+	printf "rootfs_checksum %s\n" ${rootfs_md5} >> $setenv_script
+
+	# store u-boot env changes
+	mkdir -p /var/lock
+	fw_setenv -s $setenv_script || {
+		echo "failed to update U-Boot environment"
+		return 1
+	}
+}
diff --git a/target/linux/ath79/generic/base-files/lib/upgrade/platform.sh b/target/linux/ath79/generic/base-files/lib/upgrade/platform.sh
index f4fca06384..3ce273990f 100644
--- a/target/linux/ath79/generic/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ath79/generic/base-files/lib/upgrade/platform.sh
@@ -5,6 +5,9 @@
 PART_NAME=firmware
 REQUIRE_IMAGE_METADATA=1
 
+RAMFS_COPY_BIN='fw_printenv fw_setenv'
+RAMFS_COPY_DATA='/etc/fw_env.config /var/lock/fw_printenv.lock'
+
 redboot_fis_do_upgrade() {
 	local append
 	local sysup_file="$1"
@@ -47,6 +50,10 @@ platform_do_upgrade() {
 	jjplus,ja76pf2)
 		redboot_fis_do_upgrade "$1" linux
 		;;
+	plasmacloud,pa300)
+		PART_NAME="inactive"
+		platform_do_upgrade_dualboot_datachk "$1"
+		;;
 	ubnt,routerstation|\
 	ubnt,routerstation-pro)
 		redboot_fis_do_upgrade "$1" kernel