ar71xx: add support for the MikroTik RB911-2Hn/5Hn boards

The patch adds support for the MikroTik RB911-2Hn (911 Lite2)
and the RB911-5Hn (911 Lite5) boards:

  https://mikrotik.com/product/RB911-2Hn
  https://mikrotik.com/product/RB911-5Hn

The two boards are using the same hardware design, the only difference
between the two is the supported wireless band.

Specifications:
  * SoC: Atheros AR9344 (600MHz)
  * RAM: 64MiB
  * Storage: 16 MiB SPI NOR flash
  * Ethernet: 1x100M (Passive PoE in)
  * Wireless: AR9344 built-in wireless MAC, single chain
              802.11b/g/n (911-2Hn) or 802.11a/g/n (911-5Hn)

Notes:
  * Older versions of these boards might be equipped with a NAND
    flash chip instead of the SPI NOR device. Those boards are not
    supported (yet).
  * The MikroTik RB911-5HnD (911 Lite5 Dual) board also uses the
    same hardware. Support for that can be added later with little
    effort probably.

Installation:

1. Setup a DHCP/BOOTP Server with the following parameters:
   * DHCP-Option 66 (TFTP server name): pointing to a local TFTP
     server within the same subnet of the DHCP range
   * DHCP-Option 67 (Bootfile-Name): matching the initramfs filename
     of the to be booted image. The usable intramfs files are:
       - openwrt-ar71xx-mikrotik-vmlinux-initramfs.elf
       - openwrt-ar71xx-mikrotik-vmlinux-initramfs-lzma.elf
       - openwrt-ar71xx-mikrotik-rb-nor-flash-16M-initramfs-kernel.bin

2. Press the reset button on the board and keep that pressed.

3. Connect the board to your local network via its ethernet port.

4. Release the button after the LEDs on the board are turned off.
   Now the board should load and start the initramfs image from
   the TFTP server.

5. Upload the sysupgrade image to the board with scp:
     $ scp openwrt-ar71xx-mikrotik-rb-nor-flash-16M-squashfs-sysupgrade.bin root@192.168.1.1:/tmp/fw.bin

5. Log in to the running system listening on 192.168.1.1 via ssh
   as root (without password):
     $ ssh root@192.168.1.1

7. Flash the uploaded firmware file from the ssh session via the
   sysupgrade command:
     root@OpenWrt:~# sysupgrade /tmp/fw.bin

Signed-off-by: Gabor Juhos <juhosg@freemail.hu>

3 files changed, 100 insertions, 0 deletions

diff --git a/target/linux/ar71xx/files/arch/mips/ath79/Kconfig.openwrt b/target/linux/ar71xx/files/arch/mips/ath79/Kconfig.openwrt
index 3ca77550bc..caaaf97792 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/Kconfig.openwrt
+++ b/target/linux/ar71xx/files/arch/mips/ath79/Kconfig.openwrt
@@ -1054,6 +1054,8 @@ config ATH79_MACH_RBSPI
 	select ATH79_ROUTERBOOT
 	help
 	  Say 'Y' here if you want your kernel to support the
+	  MikroTik ROuterBOARD 911-2Hn (911 Lite2)
+	  MikroTik ROuterBOARD 911-5Hn (911 Lite5)
 	  MikroTik RouterBOARD mAP
 	  MikroTik RouterBOARD mAP lite
 	  MikroTik RouterBOARD hAP lite
diff --git a/target/linux/ar71xx/files/arch/mips/ath79/mach-rbspi.c b/target/linux/ar71xx/files/arch/mips/ath79/mach-rbspi.c
index 25e920f593..f7f3b028f4 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/mach-rbspi.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/mach-rbspi.c
@@ -3,6 +3,8 @@
  *
  *  - MikroTik RouterBOARD mAP 2nD
  *  - MikroTik RouterBOARD mAP L-2nD
+ *  - MikroTik RouterBOARD 911-2Hn (911 Lite2)
+ *  - MikroTik RouterBOARD 911-5Hn (911 Lite5)
  *  - MikroTik RouterBOARD 941L-2nD
  *  - MikroTik RouterBOARD 951Ui-2nD
  *  - MikroTik RouterBOARD 952Ui-5ac2nD
@@ -509,6 +511,56 @@ static struct platform_device rbwapgsc_phy_device = {
 	},
 };
 
+/* RB911L GPIOs */
+#define RB911L_GPIO_BTN_RESET	15
+#define RB911L_GPIO_LED_1	13
+#define RB911L_GPIO_LED_2	12
+#define RB911L_GPIO_LED_3	4
+#define RB911L_GPIO_LED_4	21
+#define RB911L_GPIO_LED_5	18
+#define RB911L_GPIO_LED_ETH	20
+#define RB911L_GPIO_LED_POWER	11
+#define RB911L_GPIO_LED_USER	3
+#define RB911L_GPIO_PIN_HOLE	14 /* for reference */
+
+static struct gpio_led rb911l_leds[] __initdata = {
+	{
+		.name = "rb:green:eth",
+		.gpio = RB911L_GPIO_LED_ETH,
+		.active_low = 1,
+	}, {
+		.name = "rb:green:led1",
+		.gpio = RB911L_GPIO_LED_1,
+		.active_low = 1,
+	}, {
+		.name = "rb:green:led2",
+		.gpio = RB911L_GPIO_LED_2,
+		.active_low = 1,
+	}, {
+		.name = "rb:green:led3",
+		.gpio = RB911L_GPIO_LED_3,
+		.active_low = 1,
+	}, {
+		.name = "rb:green:led4",
+		.gpio = RB911L_GPIO_LED_4,
+		.active_low = 1,
+	}, {
+		.name = "rb:green:led5",
+		.gpio = RB911L_GPIO_LED_5,
+		.active_low = 1,
+	}, {
+		.name = "rb:green:power",
+		.gpio = RB911L_GPIO_LED_POWER,
+		.default_state = LEDS_GPIO_DEFSTATE_ON,
+		.open_drain = 1,
+	}, {
+		.name = "rb:green:user",
+		.gpio = RB911L_GPIO_LED_USER,
+		.active_low = 1,
+		.open_drain = 1,
+	},
+};
+
 static struct gen_74x164_chip_platform_data rbspi_ssr_data = {
 	.base = RBSPI_SSR_GPIO_BASE,
 	.num_registers = 1,
@@ -1015,8 +1067,53 @@ static void __init rbwapgsc_setup(void)
 			rbwapgsc_leds);
 }
 
+/*
+ * Setup the 911L hardware (AR9344).
+ */
+static void __init rb911l_setup(void)
+{
+	const struct rb_info *info;
+
+	info = rbspi_platform_setup();
+	if (!info)
+		return;
+
+	if (!rb_has_hw_option(info, RB_HW_OPT_NO_NAND)) {
+		/*
+		 * Old hardware revisions might be equipped with a NAND flash
+		 * chip instead of the 16MiB SPI NOR device. Those boards are
+		 * not supported at the moment, so throw a warning and skip
+		 * the peripheral setup to avoid messing up the data in the
+		 * flash chip.
+		 */
+		WARN(1, "The NAND flash on this board is not supported.\n");
+	} else {
+		rbspi_peripherals_setup(0);
+	}
+
+	ath79_register_mdio(1, 0x0);
+
+	ath79_init_mac(ath79_eth1_data.mac_addr, ath79_mac_base, 0);
+
+	ath79_eth1_data.phy_if_mode = PHY_INTERFACE_MODE_GMII;
+	ath79_eth1_data.speed = SPEED_1000;
+	ath79_eth1_data.duplex = DUPLEX_FULL;
+
+	ath79_register_eth(1);
+
+	rbspi_wlan_init(0, 1);
+
+	rbspi_register_reset_button(RB911L_GPIO_BTN_RESET);
+
+	/* Make the eth LED controllable by software. */
+	ath79_gpio_output_select(RB911L_GPIO_LED_ETH, AR934X_GPIO_OUT_GPIO);
+
+	ath79_register_leds_gpio(-1, ARRAY_SIZE(rb911l_leds), rb911l_leds);
+}
+
 MIPS_MACHINE_NONAME(ATH79_MACH_RB_MAPL, "map-hb", rbmapl_setup);
 MIPS_MACHINE_NONAME(ATH79_MACH_RB_941, "H951L", rbhapl_setup);
+MIPS_MACHINE_NONAME(ATH79_MACH_RB_911L, "911L", rb911l_setup);
 MIPS_MACHINE_NONAME(ATH79_MACH_RB_952, "952-hb", rb952_setup);
 MIPS_MACHINE_NONAME(ATH79_MACH_RB_962, "962", rb962_setup);
 MIPS_MACHINE_NONAME(ATH79_MACH_RB_750UPR2, "750-hb", rb750upr2_setup);
diff --git a/target/linux/ar71xx/files/arch/mips/ath79/machtypes.h b/target/linux/ar71xx/files/arch/mips/ath79/machtypes.h
index a621fe2c90..394be00c99 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/machtypes.h
+++ b/target/linux/ar71xx/files/arch/mips/ath79/machtypes.h
@@ -190,6 +190,7 @@ enum ath79_mach_type {
 	ATH79_MACH_RB_750UPR2,			/* MikroTik RouterBOARD 750UP r2 */
 	ATH79_MACH_RB_751,			/* MikroTik RouterBOARD 751 */
 	ATH79_MACH_RB_751G,			/* Mikrotik RouterBOARD 751G */
+	ATH79_MACH_RB_911L,			/* Mikrotik RouterBOARD 911-2Hn/911-5Hn boards */
 	ATH79_MACH_RB_922GS,			/* Mikrotik RouterBOARD 911/922GS boards */
 	ATH79_MACH_RB_941,			/* MikroTik RouterBOARD 941-2nD */
 	ATH79_MACH_RB_951G,			/* Mikrotik RouterBOARD 951G */