ar71xx: add support for ALFA Network R36A

ALFA Network R36A is a successor of the previous model, the R36 (Ralink
RT3050F based). New version is based on Qualcomm/Atheros QCA9531 v2.

Specification:

- 650/400/200 MHz (CPU/DDR/AHB)
- 64 MB of RAM (DDR2)
- 16 MB of FLASH (SPI NOR)
- 2x 10/100 Mbps Ethernet, with passive PoE support (24 V)
- 2T2R (QCA9531) 2.4 GHz, 2x u.fl connectors on PCB
- 1x USB 2.0 (power controlled by GPIO)
- 6x LED (5 of them are driven by GPIO)
- 2x button (reset, wifi/wps)
- external h/w watchdog (EM6324QYSP5B, disabled and not used)
- DC jack for main power input (12 V)
- UART header on PCB

Flash instruction:

You can use sysupgrade image directly in vendor firmware which is based
on LEDE/OpenWrt. Alternatively, you can use web recovery mode in U-Boot:

1. Configure PC with static IP 192.168.1.2/24.
2. Connect PC with one of RJ45 ports, press the reset button, power up
   device, wait for first blink of all LEDs (indicates network setup),
   then keep button for 3 following blinks and release it.
3. Open 192.168.1.1 address in your browser and upload sysupgrade image.

Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>

4 files changed, 152 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 2b7e086e2c..dae68d0fb7 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/Kconfig.openwrt
+++ b/target/linux/ar71xx/files/arch/mips/ath79/Kconfig.openwrt
@@ -934,6 +934,16 @@ config ATH79_MACH_WRTNODE2Q
 	select ATH79_DEV_M25P80
 	select ATH79_DEV_WMAC
 
+config ATH79_MACH_R36A
+	bool "ALFA Network R36A support"
+	select SOC_QCA953X
+	select ATH79_DEV_ETH
+	select ATH79_DEV_GPIO_BUTTONS
+	select ATH79_DEV_LEDS_GPIO
+	select ATH79_DEV_M25P80
+	select ATH79_DEV_USB
+	select ATH79_DEV_WMAC
+
 config ATH79_MACH_R602N
 	bool "P&W R602N support"
 	select SOC_QCA953X
diff --git a/target/linux/ar71xx/files/arch/mips/ath79/Makefile b/target/linux/ar71xx/files/arch/mips/ath79/Makefile
index 4f3bb97e33..b7caa5a770 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/Makefile
+++ b/target/linux/ar71xx/files/arch/mips/ath79/Makefile
@@ -162,6 +162,7 @@ obj-$(CONFIG_ATH79_MACH_PB42)			+= mach-pb42.o
 obj-$(CONFIG_ATH79_MACH_PB44)			+= mach-pb44.o
 obj-$(CONFIG_ATH79_MACH_PQI_AIR_PEN)		+= mach-pqi-air-pen.o
 obj-$(CONFIG_ATH79_MACH_QIHOO_C301)		+= mach-qihoo-c301.o
+obj-$(CONFIG_ATH79_MACH_R36A)			+= mach-r36a.o
 obj-$(CONFIG_ATH79_MACH_R602N)			+= mach-r602n.o
 obj-$(CONFIG_ATH79_MACH_R6100)			+= mach-r6100.o
 obj-$(CONFIG_ATH79_MACH_RB2011)			+= mach-rb2011.o
diff --git a/target/linux/ar71xx/files/arch/mips/ath79/mach-r36a.c b/target/linux/ar71xx/files/arch/mips/ath79/mach-r36a.c
new file mode 100644
index 0000000000..b3493e2c42
--- /dev/null
+++ b/target/linux/ar71xx/files/arch/mips/ath79/mach-r36a.c
@@ -0,0 +1,140 @@
+/*
+ * ALFA Network R36A board support
+ *
+ * Copyright (C) 2018 Piotr Dymacz <pepe2k@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+
+#include <asm/mach-ath79/ath79.h>
+#include <asm/mach-ath79/ar71xx_regs.h>
+
+#include "common.h"
+#include "dev-eth.h"
+#include "dev-gpio-buttons.h"
+#include "dev-leds-gpio.h"
+#include "dev-m25p80.h"
+#include "dev-usb.h"
+#include "dev-wmac.h"
+#include "machtypes.h"
+
+#define R36A_GPIO_LED_LAN	4
+#define R36A_GPIO_LED_STATUS	14
+#define R36A_GPIO_LED_USB	12
+#define R36A_GPIO_LED_WAN	16
+#define R36A_GPIO_LED_WLAN	15
+
+#define R36A_GPIO_WDT_EN	1
+#define R36A_GPIO_WDT_IN	0
+#define R36A_GPIO_USB_PWR	3
+
+#define R36A_GPIO_BTN_RESET	2
+#define R36A_GPIO_BTN_RFKILL	17
+
+#define R36A_KEYS_POLL_INTERVAL		20
+#define R36A_KEYS_DEBOUNCE_INTERVAL	(3 * R36A_KEYS_POLL_INTERVAL)
+
+#define R36A_WMAC_CALDATA_OFFSET	0x1000
+
+static struct gpio_led r36a_leds_gpio[] __initdata = {
+	{
+		.name		= "r36a:blue:lan",
+		.gpio		= R36A_GPIO_LED_LAN,
+		.active_low	= 1,
+	}, {
+		.name		= "r36a:blue:status",
+		.gpio		= R36A_GPIO_LED_STATUS,
+		.active_low	= 1,
+	}, {
+		.name		= "r36a:blue:usb",
+		.gpio		= R36A_GPIO_LED_USB,
+		.active_low	= 1,
+	}, {
+		.name		= "r36a:blue:wan",
+		.gpio		= R36A_GPIO_LED_WAN,
+		.active_low	= 1,
+	}, {
+		.name		= "r36a:blue:wlan",
+		.gpio		= R36A_GPIO_LED_WLAN,
+		.active_low	= 1,
+	},
+};
+
+static struct gpio_keys_button r36a_gpio_keys[] __initdata = {
+	{
+		.desc			= "reset",
+		.type			= EV_KEY,
+		.code			= KEY_RESTART,
+		.debounce_interval	= R36A_KEYS_DEBOUNCE_INTERVAL,
+		.gpio			= R36A_GPIO_BTN_RESET,
+		.active_low		= 1,
+	}, {
+		.desc			= "rfkill",
+		.type			= EV_KEY,
+		.code			= KEY_RFKILL,
+		.debounce_interval	= R36A_KEYS_DEBOUNCE_INTERVAL,
+		.gpio			= R36A_GPIO_BTN_RFKILL,
+		.active_low		= 1,
+	},
+};
+
+static void __init r36a_setup(void)
+{
+	u8 *art = (u8 *) KSEG1ADDR(0x1f070000);
+
+	ath79_register_m25p80(NULL);
+
+	ath79_setup_ar933x_phy4_switch(false, false);
+
+	ath79_register_mdio(0, 0x0);
+
+	ath79_switch_data.phy4_mii_en = 1;
+	ath79_switch_data.phy_poll_mask = 0xf7;
+
+	/* LAN */
+	ath79_eth0_data.duplex = DUPLEX_FULL;
+	ath79_eth0_data.phy_if_mode = PHY_INTERFACE_MODE_MII;
+	ath79_eth0_data.phy_mask = BIT(4);
+	ath79_eth0_data.speed = SPEED_100;
+	ath79_init_mac(ath79_eth0_data.mac_addr, art, 0);
+	ath79_register_eth(0);
+
+	/* WAN */
+	ath79_eth1_data.duplex = DUPLEX_FULL;
+	ath79_eth1_data.phy_if_mode = PHY_INTERFACE_MODE_GMII;
+	ath79_init_mac(ath79_eth1_data.mac_addr, art, 1);
+	ath79_register_eth(1);
+
+	/* Disable JTAG (enables GPIO0-3) */
+	ath79_gpio_function_enable(AR934X_GPIO_FUNC_JTAG_DISABLE);
+
+	ath79_register_leds_gpio(-1, ARRAY_SIZE(r36a_leds_gpio),
+				 r36a_leds_gpio);
+
+	ath79_register_gpio_keys_polled(-1, R36A_KEYS_POLL_INTERVAL,
+					ARRAY_SIZE(r36a_gpio_keys),
+					r36a_gpio_keys);
+
+	gpio_request_one(R36A_GPIO_WDT_IN,
+			 GPIOF_OUT_INIT_LOW | GPIOF_EXPORT_DIR_FIXED,
+			 "WDT input");
+
+	gpio_request_one(R36A_GPIO_WDT_EN,
+			 GPIOF_OUT_INIT_LOW | GPIOF_EXPORT_DIR_FIXED,
+			 "WDT enable");
+
+	gpio_request_one(R36A_GPIO_USB_PWR,
+			 GPIOF_OUT_INIT_HIGH | GPIOF_EXPORT_DIR_FIXED,
+			 "USB power");
+
+	ath79_register_wmac(art + R36A_WMAC_CALDATA_OFFSET, NULL);
+
+	ath79_register_usb();
+}
+
+MIPS_MACHINE(ATH79_MACH_R36A, "R36A", "ALFA Network R36A", r36a_setup);
diff --git a/target/linux/ar71xx/files/arch/mips/ath79/machtypes.h b/target/linux/ar71xx/files/arch/mips/ath79/machtypes.h
index 40ac034388..4afda05638 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/machtypes.h
+++ b/target/linux/ar71xx/files/arch/mips/ath79/machtypes.h
@@ -166,6 +166,7 @@ enum ath79_mach_type {
 	ATH79_MACH_PB44,			/* Atheros PB44 reference board */
 	ATH79_MACH_PQI_AIR_PEN,			/* PQI Air Pen */
 	ATH79_MACH_QIHOO_C301,			/* Qihoo 360 C301 */
+	ATH79_MACH_R36A,			/* ALFA Network R36A */
 	ATH79_MACH_R602N,			/* P&W R602N */
 	ATH79_MACH_R6100,			/* NETGEAR R6100 */
 	ATH79_MACH_RAMBUTAN,			/* 8devices Rambutan */