ar71xx: add Arduino Yun

This is based on patches from Federico Fissore <f.fissore@arduino.cc>
especially this one:
https://github.com/arduino/openwrt-yun/commit/7e2976fa83fb0d72a955574499178c387a1b3c92

The console is running with 250000 baud which is a non standard baud
rate and needs an extra patch to be applied, I will try to get this
patch upstream or something else which accomplish the same.

Some upstream code looks like there are many different versions of this
SoC, are these only internal versions and all versions on the consumer
market are the same? I saw different GPIO configuration and flash sizes
of 8MB and 16MB?

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

SVN-Revision: 47451

1 files changed, 137 insertions, 0 deletions

diff --git a/target/linux/ar71xx/files/arch/mips/ath79/mach-arduino-yun.c b/target/linux/ar71xx/files/arch/mips/ath79/mach-arduino-yun.c
new file mode 100644
index 0000000000..fbe1f99c79
--- /dev/null
+++ b/target/linux/ar71xx/files/arch/mips/ath79/mach-arduino-yun.c
@@ -0,0 +1,137 @@
+/*
+ *  Arduino Yun support
+ *
+ *  Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
+ *  Copyright (C) 2015 Hauke Mehrtens <hauke@hauke-m.de>
+ *
+ *  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 "dev-eth.h"
+#include "dev-gpio-buttons.h"
+#include "dev-leds-gpio.h"
+#include "dev-m25p80.h"
+#include "dev-spi.h"
+#include "dev-usb.h"
+#include "dev-wmac.h"
+#include "machtypes.h"
+#include <asm/mach-ath79/ar71xx_regs.h>
+#include <asm/mach-ath79/ath79.h>
+#include "common.h"
+#include "gpio.h"
+#include "linux/gpio.h"
+
+// Uncomment to have reset on gpio18 instead of gipo7
+#define DS2_B
+
+#define DS_GPIO_LED_WLAN		0
+#define DS_GPIO_LED_USB			1
+
+#define DS_GPIO_OE			21
+#define DS_GPIO_AVR_RESET		18
+
+// Maintained to have the console in the previous version of DS2 working
+#define DS_GPIO_AVR_RESET_DS2		7
+
+#define DS_GPIO_OE2			22
+#define DS_GPIO_UART_ENA		23
+#define DS_GPIO_CONF_BTN		20
+
+#define DS_KEYS_POLL_INTERVAL		20	/* msecs */
+#define DS_KEYS_DEBOUNCE_INTERVAL	(3 * DS_KEYS_POLL_INTERVAL)
+
+#define DS_MAC0_OFFSET			0x0000
+#define DS_MAC1_OFFSET			0x0006
+#define DS_CALDATA_OFFSET		0x1000
+#define DS_WMAC_MAC_OFFSET		0x1002
+
+
+static struct gpio_led ds_leds_gpio[] __initdata = {
+	{
+		.name		= "arduino:white:usb",
+		.gpio		= DS_GPIO_LED_USB,
+		.active_low	= 0,
+	},
+	{
+		.name		= "arduino:blue:wlan",
+		.gpio		= DS_GPIO_LED_WLAN,
+		.active_low	= 0,
+	},
+};
+
+static void __init ds_common_setup(void)
+{
+	static u8 mac[6];
+
+	u8 *art = (u8 *) KSEG1ADDR(0x1fff0000);
+	ath79_register_m25p80(NULL);
+
+	if (ar93xx_wmac_read_mac_address(mac)) {
+		ath79_register_wmac(NULL, NULL);
+	} else {
+		ath79_register_wmac(art + DS_CALDATA_OFFSET,
+				    art + DS_WMAC_MAC_OFFSET);
+		memcpy(mac, art + DS_WMAC_MAC_OFFSET, sizeof(mac));
+	}
+
+	mac[3] |= 0x08;
+	ath79_init_mac(ath79_eth0_data.mac_addr, mac, 0);
+
+	mac[3] &= 0xF7;
+	ath79_init_mac(ath79_eth1_data.mac_addr, mac, 0);
+	ath79_register_mdio(0, 0x0);
+
+	/* LAN ports */
+	ath79_register_eth(1);
+
+	/* WAN port */
+	ath79_register_eth(0);
+}
+
+static void __init ds_setup(void)
+{
+	u32 t;
+
+	ds_common_setup();
+
+	ath79_register_leds_gpio(-1, ARRAY_SIZE(ds_leds_gpio),
+				 ds_leds_gpio);
+	ath79_register_usb();
+
+	//Disable the Function for some pins to have GPIO functionality active
+	// GPIO6-7-8 and GPIO11
+	ath79_gpio_function_setup(AR933X_GPIO_FUNC_JTAG_DISABLE | AR933X_GPIO_FUNC_I2S_MCK_EN, 0);
+
+	ath79_gpio_function2_setup(AR933X_GPIO_FUNC2_JUMPSTART_DISABLE, 0);
+
+	printk("Setting DogStick2 GPIO\n");
+
+	t = ath79_reset_rr(AR933X_RESET_REG_BOOTSTRAP);
+	t |= AR933X_BOOTSTRAP_MDIO_GPIO_EN;
+	ath79_reset_wr(AR933X_RESET_REG_BOOTSTRAP, t);
+
+	// Put the avr reset to high 
+	if (gpio_request_one(DS_GPIO_AVR_RESET_DS2,
+	    GPIOF_OUT_INIT_LOW | GPIOF_EXPORT_DIR_FIXED, "OE-1") != 0)
+		printk("Error setting GPIO OE\n");
+	gpio_unexport(DS_GPIO_AVR_RESET_DS2);
+	gpio_free(DS_GPIO_AVR_RESET_DS2);
+
+	// enable OE of level shifter
+	if (gpio_request_one(DS_GPIO_OE,
+	    GPIOF_OUT_INIT_LOW | GPIOF_EXPORT_DIR_FIXED, "OE-1") != 0)
+		printk("Error setting GPIO OE\n");
+
+	if (gpio_request_one(DS_GPIO_UART_ENA,
+	    GPIOF_OUT_INIT_LOW | GPIOF_EXPORT_DIR_FIXED, "UART-ENA") != 0)
+		printk("Error setting GPIO Uart Enable\n");
+
+	// enable OE of level shifter
+	if (gpio_request_one(DS_GPIO_OE2,
+	    GPIOF_OUT_INIT_LOW | GPIOF_EXPORT_DIR_FIXED, "OE-2") != 0)
+		printk("Error setting GPIO OE2\n");
+}
+
+MIPS_MACHINE(ATH79_MACH_ARDUINO_YUN, "Yun", "Arduino Yun", ds_setup);