imx6: Add support for Toradex Apalis family of CoMs

This patch adds support for the following computer on modules (CoM) from
Toradex[A]:

 Apalis iMX6 Quad 2GB IT - i.MX 6Quad 800MHz, 2GB DDR3, 4GB eMMC
                                             -40° to +85° C Temp
 Apalis iMX6 Quad 1GB    - i.MX 6Quad 1GHz,   1GB DDR3, 4GB eMMC
                                               0° to +70° C Temp
 Apalis iMX6 Dual 1GB IT - i.MX 6Dual 800MHz, 1GB DDR3, 4GB eMMC
                                             -40° to +85° C Temp
 Apalis iMX6 Dual 512MB  - i.MX 6Dual 1GHz, 512MB DDR3, 4GB eMMC
                                               0° to +70° C Temp

I've developed and tested it on Quad 2GB IT v1.1A and Dual 512MB v1.1A
CoMs, using Ixora[B] carrier board v1.0A, but it should hopefuly work on
Eval[C] board as well.

A. https://www.toradex.com/computer-on-modules/apalis-arm-family/nxp-freescale-imx-6
B. https://www.toradex.com/products/carrier-board/ixora-carrier-board
C. https://www.toradex.com/products/carrier-board/apalis-evaluation-board

Flashing/recovery instructions:

 1. Download and compile imx_loader for OpenWrt from
    https://github.com/ynezz/imx_loader

 2. Enter recovery mode as desribed in
    https://developer.toradex.com/knowledge-base/imx-recovery-mode

 3. Connect board via USB to the host computer, check that it's connected
    by lsusb:

    15a2:0054 Freescale Semiconductor, Inc. i.MX 6Dual/6Quad SystemOnChip
              in RecoveryMode

 4. Copy following OpenWrt images to imx_loader directory:
         SPL
         u-boot.img
         u-boot-with-spl.imx
         openwrt-imx6-apalis-recovery.scr
         openwrt-imx6-apalis-squashfs.combined.bin

 5. Run imx_usb in imx_loader directory

Signed-off-by: Petr Štetiar <ynezz@true.cz>

target/linux/imx6/base-files/lib/imx6.sh

@@ -6,6 +6,33 @@
 IMX6_BOARD_NAME=
 IMX6_MODEL=
 
+rootpartuuid() {
+	local cmdline=$(cat /proc/cmdline)
+	local bootpart=${cmdline##*root=}
+	bootpart=${bootpart%% *}
+	local uuid=${bootpart#PARTUUID=}
+	echo ${uuid%-02}
+}
+
+bootdev_from_uuid() {
+	blkid | grep "PTUUID=\"$(rootpartuuid)\"" | cut -d : -f1
+}
+
+bootpart_from_uuid() {
+	blkid | grep $(rootpartuuid)-01 | cut -d : -f1
+}
+
+rootpart_from_uuid() {
+	blkid | grep $(rootpartuuid)-02 | cut -d : -f1
+}
+
+apalis_mount_boot() {
+	mkdir -p /boot
+	[ -f /boot/uImage ] || {
+		mount -o rw,noatime $(bootpart_from_uuid) /boot > /dev/null
+	}
+}
+
 imx6_board_detect() {
 	local machine
 	local name
@@ -59,6 +86,15 @@ imx6_board_detect() {
 		name="cubox-i"
 		;;
 
+	"Toradex Apalis iMX6Q/D Module on Ixora Carrier Board" |\
+	"Toradex Apalis iMX6Q/D Module on Ixora Carrier Board V1.1")
+		name="apalis,ixora"
+		;;
+
+	"Toradex Apalis iMX6Q/D Module on Apalis Evaluation Board")
+		name="apalis,eval"
+		;;
+
 	"Wandboard i.MX6 Dual Lite Board")
 		name="wandboard"
 		;;

target/linux/imx6/base-files/lib/preinit/79_move_config

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+. /lib/imx6.sh
+. /lib/functions.sh
+
+move_config() {
+	local board=$(board_name)
+
+	case "$board" in
+	apalis*)
+		if [ -b $(bootpart_from_uuid) ]; then
+			apalis_mount_boot
+			[ -f /boot/sysupgrade.tgz ] && mv -f /boot/sysupgrade.tgz /
+			umount /boot
+		fi
+		;;
+	esac
+}
+
+boot_hook_add preinit_mount_root move_config

target/linux/imx6/base-files/lib/upgrade/platform.sh

@@ -2,10 +2,44 @@
 # Copyright (C) 2010-2015 OpenWrt.org
 #
 
+. /lib/imx6.sh
+
+RAMFS_COPY_BIN='blkid'
+
+enable_image_metadata_check() {
+	case "$(board_name)" in
+		apalis*)
+			REQUIRE_IMAGE_METADATA=1
+			;;
+	esac
+}
+enable_image_metadata_check
+
+apalis_copy_config() {
+	apalis_mount_boot
+	cp -af "$CONF_TAR" /boot/
+	sync
+	umount /boot
+}
+
+apalis_do_upgrade() {
+	local board_name=$(board_name)
+	board_name=${board_name/,/_}
+
+	apalis_mount_boot
+	get_image "$1" | tar Oxf - sysupgrade-${board_name}/kernel > /boot/uImage
+	get_image "$1" | tar Oxf - sysupgrade-${board_name}/root > $(rootpart_from_uuid)
+	sync
+	umount /boot
+}
+
 platform_check_image() {
 	local board=$(board_name)
 
 	case "$board" in
+	apalis*)
+		return 0
+		;;
 	*gw5*)
 		nand_do_platform_check $board $1
 		return $?;
@@ -20,8 +54,21 @@ platform_do_upgrade() {
 	local board=$(board_name)
 
 	case "$board" in
+	apalis*)
+		apalis_do_upgrade "$1"
+		;;
 	*gw5*)
 		nand_do_upgrade "$1"
 		;;
 	esac
 }
+
+platform_copy_config() {
+	local board=$(board_name)
+
+	case "$board" in
+	apalis*)
+		apalis_copy_config
+		;;
+	esac
+}