ath79: add support for TP-Link Archer D7/D7b v1

TP-Link Archer D7 v1 is a dual-band AC1750 router + modem.
The router section is based on Qualcomm/Atheros QCA9558 + QCA9880.
The "DSL" section is based on BCM6318 but it's currently not supported.

The Archer D7b seems to differ from the Archer D7 only in the
partition table.

Router section - Specification:

775/650/258 MHz (CPU/DDR/AHB)
128 MB of RAM (DDR2)
16 MB of FLASH (SPI NOR)
3T3R 2.4 GHz
3T3R 5 GHz
4x 10/100/1000 Mbps Ethernet
7x LED, 2x button
UART header on PCB

Known issues:

- Broadband LED (missing GPIO - probably driven by the BCM6318)
- Internet LED (missing GPIO - probably driven by the BCM6318)
- WIFI LED (working only for one interface at a time, while in the
  OEM firmware works for both wifi interfaces; thus, this patch does
  not set a trigger by default)
- DSL not working (eth0)

UART connection
---------------
J1 HEADER (Qualcomm CPU)
. VCC
. GND
. RX
O TX

J41 HEADER (Broadcom CPU)
. VCC
. GND
. RX
O TX

The following instructions require a connection to the J1 UART header
and are tested for the Archer D7 v1.
For the Archer D7b v1, names should be changed accordingly.

Flash instructions under U-Boot, using UART
------------------------------------------
 1. Press "tpl" to stop autobooting and obtain U-Boot CLI access.
 2. Setup ip addresses for U-Boot and your tftp server.
 3. Issue below commands:
	tftpboot 0x81000000 openwrt-ath79-generic-tplink_archer-d7-v1-squashfs-sysupgrade.bin
	erase 0x9f020000 +f90000
	cp.b 0x81000000 0x9f020000 0xf90000
	reset

Initramfs instructions under U-Boot for testing, using UART
----------------------------------------------------------
 1. Press "tpl" to stop autobooting and obtain U-Boot CLI access.
 2. Setup ip addresses for U-Boot and your tftp server.
 3. Issue below commands:
	tftpboot 0x81000000 openwrt-ath79-generic-tplink_archer-d7-v1-initramfs-kernel.bin
	bootm 0x81000000
 4. Here you can backup the original firmware and/or flash the sysupgrade openwrt if you want

Restore the original firmware
-----------------------------
 0. Backup every partition using the OpenWrt web interface
 1. Download the OEM firmware from the TP-Link website
 2. Extract the bin file in a folder (eg. Archer_D7v1_1.6.0_0.9.1_up_boot(160216)_2016-02-16_15.55.48.bin)
 3. Remove the U-Boot and the Broadcom image part from the file.
    Issue the following command:
	dd if="Archer_D7v1_1.6.0_0.9.1_up_boot(160216)_2016-02-16_15.55.48.bin" of="Archer_D7v1_1.6.0_0.9.1_up_boot(160216)_2016-02-16_15.55.48.bin.mod" skip=257 bs=512 count=31872
 4. Double check the .mod file size. It must be 16318464 bytes.
 5. Flash it using the OpenWrt web interface. Force the update if needed.
    WARNING: Remember to NOT keep settings.

 5b. (Alternative to 5.) Flash it using the U-Boot and UART connection.
     Issue below commands in the U-Boot:
	tftpboot 0x81000000 Archer_D7v1_1.6.0_0.9.1_up_boot(160216)_2016-02-16_15.55.48.bin.mod
	erase 0x9f020000 +f90000
	cp.b 0x81000000 0x9f020000 0xf90000
	reset

Signed-off-by: Davide Fioravanti <pantanastyle@gmail.com>
[cosmetic DTS changes, remove TPLINK_HWREVADD := 0, do not use two
phyXtpt at once, add missing buttons, minor commit message adjustments]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

3 files changed, 14 insertions, 0 deletions

diff --git a/target/linux/ath79/generic/base-files/etc/board.d/01_leds b/target/linux/ath79/generic/base-files/etc/board.d/01_leds
index 3864423e58..227ccf0dfe 100755
--- a/target/linux/ath79/generic/base-files/etc/board.d/01_leds
+++ b/target/linux/ath79/generic/base-files/etc/board.d/01_leds
@@ -187,6 +187,10 @@ tplink,archer-d50-v1)
 	ucidef_set_led_switch "wan_data" "WAN Data" "tp-link:white:internet" "switch0" "0x02" "" "tx rx"
 	ucidef_set_led_switch "wan_link" "WAN Link" "tp-link:white:wan" "switch0" "0x02" "" "link"
 	;;
+tplink,archer-d7-v1|\
+tplink,archer-d7b-v1)
+	ucidef_set_led_switch "lan" "LAN" "tp-link:white:lan" "switch0" "0x3c"
+	;;
 tplink,cpe210-v1|\
 tplink,cpe220-v2|\
 tplink,cpe220-v3|\
diff --git a/target/linux/ath79/generic/base-files/etc/board.d/02_network b/target/linux/ath79/generic/base-files/etc/board.d/02_network
index 33a4b0e884..dbb722482b 100755
--- a/target/linux/ath79/generic/base-files/etc/board.d/02_network
+++ b/target/linux/ath79/generic/base-files/etc/board.d/02_network
@@ -252,6 +252,11 @@ ath79_setup_interfaces()
 		ucidef_add_switch "switch0" \
 			"0@eth0" "2:lan:3" "3:lan:2" "4:lan:1" "1:wan"
 		;;
+	tplink,archer-d7-v1|\
+	tplink,archer-d7b-v1)
+		ucidef_add_switch "switch0" \
+			"0@eth1" "3:lan:3" "4:lan:2" "5:lan:1" "6@eth0" "2:wan:4" "1:wan:5"
+		;;
 	tplink,tl-mr6400-v1)
 		ucidef_set_interfaces_lan_wan "eth0.1 eth1" "usb0"
 		ucidef_add_switch "switch0" \
diff --git a/target/linux/ath79/generic/base-files/etc/hotplug.d/firmware/11-ath10k-caldata b/target/linux/ath79/generic/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
index 43c2f9ced5..d354c7eaec 100644
--- a/target/linux/ath79/generic/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
+++ b/target/linux/ath79/generic/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
@@ -99,6 +99,11 @@ case "$FIRMWARE" in
 		caldata_extract "art" 0x5000 0x844
 		ath10k_patch_mac $(macaddr_add $(mtd_get_mac_binary romfile 0xf100) +2)
 		;;
+	tplink,archer-d7-v1|\
+	tplink,archer-d7b-v1)
+		caldata_extract "art" 0x5000 0x844
+		ath10k_patch_mac $(macaddr_add $(mtd_get_mac_binary romfs 0xf100) +2)
+		;;
 	tplink,re350k-v1)
 		caldata_extract "art" 0x5000 0x844
 		ath10k_patch_mac $(macaddr_add $(mtd_get_mac_binary config 0x10008) +2)