ipq40xx: add support for Linksys EA6350v3

Specifications:
SOC: Qualcomm IPQ4018
RAM: 256 MiB Samsung K4B2G1646F-BYK0
FLASH1: MX25L1605D 2 MB
FLASH2: Winbond W25N01GV 128Mb
ETH: Qualcomm QCA8075
WLAN0: Qualcomm Atheros QCA4018 2.4GHz 802.11b/g/n 2x2
WLAN1: Qualcomm Atheros QCA4018 5GHz 802.11n/ac W2 2x2
INPUT: WPS, Reset
LED: Status - Green
SERIAL: Header at J19, Beneath DC Power Jack
        1-VCC ; 2-TX ; 3-RX; 4-GND;
        Serial 115200-8-N-1.

Tested and working:
- USB (requires extra packages)
- LAN Ethernet (Correct MAC-address)
- WAN Ethernet (Correct MAC-address)
- 2.4 GHz WiFi (Correct MAC-address)
- 5 GHz WiFi (Correct MAC-address)
- Factory installation from Web UI
- OpenWRT sysupgrade
- LED
- Reset Button

Need Testing:
- WPS button

Install via Web UI:
- Attach to a LAN port on the router.
- Connect to the Linksys Smart WiFi Page (default 192.168.1.1) and login
- Select the connectivity tab on the left
- In the manual update box on the right
- Select browse, and browse to
  openwrt-ipq40xx-linksys_ea6350v3-squashfs-factory.bin
- Click update.
- Read and accept the warning
- The router LED will start blinking. When the router LED goes solid, you
  can now navigate to 192.168.1.1 to your new OpenWrt installation.

Sysupgrade:
- Flash the sysupgrade image as usual. Please: try to do a reset everytime
  you can (doing it with LuCI is easy and can be done in the same step).

Recovery (Automatic):
- If the device fails to boot after install or upgrade, whilst the unit is
  turned on:
1 - Wait 15 seconds
2 - Switch Off and Wait 10 seconds
3 - Switch on
4 - Repeat steps 1 to 3, 3 times then go to 5.
5 - U-boot will have now erased the failed update and switched back to the
    last working firmware - you should be able to access your router on
    LAN.

Recovery (Manual):
- The steps for manual recovery are the same as the generic u-boot tftp
  client method.

Back To Stock:
- Use the generic recovery using the tftp client method to flash the
  "civic.img". Also you can strip-and-pad the original image and use
  the generic "mtd" method by flashing over the "kernel" partition.
* Just be careful to flash in the partition that the device is currently
  booted.

Signed-off-by: Ryan Pannell <ryan@osukl.com>
Signed-off-by: Oever González <notengobattery@gmail.com>
[minor edits, removed second compatible of nand, added dtb entry to 4.19]
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

2 files changed, 98 insertions, 0 deletions

diff --git a/target/linux/ipq40xx/base-files/lib/upgrade/linksys.sh b/target/linux/ipq40xx/base-files/lib/upgrade/linksys.sh
new file mode 100755
index 0000000000..9772d68f3d
--- /dev/null
+++ b/target/linux/ipq40xx/base-files/lib/upgrade/linksys.sh
@@ -0,0 +1,95 @@
+linksys_get_target_firmware() {
+	cur_boot_part=$(/usr/sbin/fw_printenv -n boot_part)
+	target_firmware=""
+	if [ "$cur_boot_part" = "1" ]; then
+		# current primary boot - update alt boot
+		target_firmware="alt_kernel"
+		fw_setenv boot_part 2
+		# In the Linksys EA6350v3, it is enough to set the boot_part as the boot command line is
+		# bootcmd=if test $boot_part = 1; then run bootpart1; else run bootpart2; fi
+		# - You probably want to use that if your device's uboot does not eval bootcmd
+		#fw_setenv bootcmd "run altnandboot"
+	elif [ "$cur_boot_part" = "2" ]; then
+		# current alt boot - update primary boot
+		target_firmware="kernel"
+		fw_setenv boot_part 1
+		#fw_setenv bootcmd "run nandboot"
+	fi
+
+	# re-enable recovery so we get back if the new firmware is broken
+	fw_setenv auto_recovery yes
+	# see /etc/init.d/zlinksys_recovery
+
+	echo "$target_firmware"
+}
+
+linksys_get_root_magic() {
+	(get_image "$@" | dd skip=786432 bs=4 count=1 | hexdump -v -n 4 -e '1/1 "%02x"') 2>/dev/null
+}
+
+platform_do_upgrade_linksys() {
+	local magic_long="$(get_magic_long "$1")"
+
+	mkdir -p /var/lock
+	local part_label="$(linksys_get_target_firmware)"
+	touch /var/lock/fw_printenv.lock
+
+	if [ ! -n "$part_label" ]; then
+		echo "cannot find target partition"
+		exit 1
+	fi
+
+	local target_mtd=$(find_mtd_part $part_label)
+
+	[ "$magic_long" = "73797375" ] && {
+		CI_KERNPART="$part_label"
+		if [ "$part_label" = "kernel" ]; then
+			CI_UBIPART="rootfs"
+		else
+			CI_UBIPART="alt_rootfs"
+		fi
+
+		# remove "squashfs" vol (in case we are flashing over a stock image, which is also UBI)
+
+		local mtdnum="$( find_mtd_index "$CI_UBIPART" )"
+		if [ ! "$mtdnum" ]; then
+			echo "cannot find ubi mtd partition $CI_UBIPART"
+			return 1
+		fi
+
+		local ubidev="$( nand_find_ubi "$CI_UBIPART" )"
+		if [ ! "$ubidev" ]; then
+			ubiattach -m "$mtdnum"
+			sync
+			ubidev="$( nand_find_ubi "$CI_UBIPART" )"
+		fi
+
+		if [ "$ubidev" ]; then
+			local squash_ubivol="$( nand_find_volume $ubidev squashfs )"
+			# kill volume
+			[ "$squash_ubivol" ] && ubirmvol /dev/$ubidev -N squashfs || true
+		fi
+
+		# complete std upgrade
+		nand_upgrade_tar "$1"
+	}
+	[ "$magic_long" = "27051956" ] && {
+		# This magic is for a uImage (which is a sysupgrade image)
+		# check firmwares' rootfs types
+		local oldroot="$(linksys_get_root_magic $target_mtd)"
+		local newroot="$(linksys_get_root_magic "$1")"
+
+		if [ "$newroot" = "55424923" -a "$oldroot" = "55424923" ]; then
+			# we're upgrading from a firmware with UBI to one with UBI
+			# erase everything to be safe
+			# - Is that really needed? Won't remove (or comment) the if, because it may be needed in a future device.
+			#mtd erase $part_label
+			#get_image "$1" | mtd -n write - $part_label
+			echo "writing \"$1\" UBI image to \"$part_label\" (UBI)..."
+			get_image "$1" | mtd write - $part_label
+		else
+			echo "writing \"$1\" image to \"$part_label\""
+			get_image "$1" | mtd write - $part_label
+		fi
+	}
+}
diff --git a/target/linux/ipq40xx/base-files/lib/upgrade/platform.sh b/target/linux/ipq40xx/base-files/lib/upgrade/platform.sh
index 610f9bbbdb..c5f06ffb3a 100644
--- a/target/linux/ipq40xx/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ipq40xx/base-files/lib/upgrade/platform.sh
@@ -54,6 +54,9 @@ platform_do_upgrade() {
 		CI_KERNPART="linux"
 		nand_do_upgrade "$1"
 		;;
+	linksys,ea6350v3)
+		platform_do_upgrade_linksys "$ARGV"
+		;;
 	openmesh,a42 |\
 	openmesh,a62)
 		PART_NAME="inactive"