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As show in Arduino Yun schematic [1] GPIO 21 and 22 are connected to output enable pin (OE) of two NTB01xx level shifters. NTB01xx datasheets [2] [3] states that OE pin are active-high therefore we should initialize GPIO 21 (DS_GPIO_OE) and GPIO 22 (DS_GPIO_OE2) accordingly to actually enable level shifters outputs. [1] https://www.arduino.cc/en/uploads/Main/arduino-Yun-schematic.pdf [2] https://www.nxp.com/docs/en/data-sheet/NTB0102.pdf [3] https://www.nxp.com/docs/en/data-sheet/NTB0104.pdf Signed-off-by: Edoardo Scaglia <edoardo.87@gmail.com>
158 lines
4.1 KiB
C
158 lines
4.1 KiB
C
/*
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* Arduino Yun support
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*
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* Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2015 Hauke Mehrtens <hauke@hauke-m.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include "dev-eth.h"
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#include "dev-gpio-buttons.h"
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#include "dev-leds-gpio.h"
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#include "dev-m25p80.h"
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#include "dev-spi.h"
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#include "dev-usb.h"
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#include "dev-wmac.h"
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#include "machtypes.h"
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#include <asm/mach-ath79/ar71xx_regs.h>
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#include <asm/mach-ath79/ath79.h>
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#include <linux/gpio.h>
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#include "common.h"
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// Uncomment to have reset on gpio18 instead of gipo7
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#define DS2_B
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#define DS_GPIO_LED_WLAN 0
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#define DS_GPIO_LED_USB 1
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#define DS_GPIO_OE 21
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#define DS_GPIO_AVR_RESET 18
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// Maintained to have the console in the previous version of DS2 working
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#define DS_GPIO_AVR_RESET_DS2 7
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#define DS_GPIO_OE2 22
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#define DS_GPIO_UART_ENA 23
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#define DS_GPIO_CONF_BTN 20
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#define DS_KEYS_POLL_INTERVAL 20 /* msecs */
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#define DS_KEYS_DEBOUNCE_INTERVAL (3 * DS_KEYS_POLL_INTERVAL)
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#define DS_MAC0_OFFSET 0x0000
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#define DS_MAC1_OFFSET 0x0006
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#define DS_CALDATA_OFFSET 0x1000
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#define DS_WMAC_MAC_OFFSET 0x1002
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static struct gpio_led ds_leds_gpio[] __initdata = {
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{
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.name = "arduino:white:usb",
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.gpio = DS_GPIO_LED_USB,
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.active_low = 0,
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},
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{
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.name = "arduino:blue:wlan",
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.gpio = DS_GPIO_LED_WLAN,
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.active_low = 0,
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},
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};
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static struct gpio_keys_button ds_gpio_keys[] __initdata = {
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{
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.desc = "configuration button",
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.type = EV_KEY,
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.code = KEY_WPS_BUTTON,
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.debounce_interval = DS_KEYS_DEBOUNCE_INTERVAL,
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.gpio = DS_GPIO_CONF_BTN,
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.active_low = 1,
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},
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};
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static void __init ds_common_setup(void)
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{
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static u8 mac[6];
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u8 *art = (u8 *) KSEG1ADDR(0x1fff0000);
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ath79_register_m25p80(NULL);
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if (ar93xx_wmac_read_mac_address(mac)) {
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ath79_register_wmac(NULL, NULL);
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} else {
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ath79_register_wmac(art + DS_CALDATA_OFFSET,
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art + DS_WMAC_MAC_OFFSET);
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memcpy(mac, art + DS_WMAC_MAC_OFFSET, sizeof(mac));
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}
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mac[3] |= 0x08;
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ath79_init_mac(ath79_eth0_data.mac_addr, mac, 0);
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mac[3] &= 0xF7;
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ath79_init_mac(ath79_eth1_data.mac_addr, mac, 0);
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ath79_register_mdio(0, 0x0);
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/* LAN ports */
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ath79_register_eth(1);
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/* WAN port */
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ath79_register_eth(0);
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}
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static void __init ds_setup(void)
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{
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u32 t;
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ds_common_setup();
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ath79_register_leds_gpio(-1, ARRAY_SIZE(ds_leds_gpio),
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ds_leds_gpio);
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ath79_register_gpio_keys_polled(-1, DS_KEYS_POLL_INTERVAL,
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ARRAY_SIZE(ds_gpio_keys),
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ds_gpio_keys);
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ath79_register_usb();
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/* use the swtich_led directly form sysfs */
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ath79_gpio_function_disable(AR933X_GPIO_FUNC_ETH_SWITCH_LED0_EN |
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AR933X_GPIO_FUNC_ETH_SWITCH_LED1_EN |
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AR933X_GPIO_FUNC_ETH_SWITCH_LED2_EN |
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AR933X_GPIO_FUNC_ETH_SWITCH_LED3_EN |
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AR933X_GPIO_FUNC_ETH_SWITCH_LED4_EN);
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//Disable the Function for some pins to have GPIO functionality active
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// GPIO6-7-8 and GPIO11
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ath79_gpio_function_setup(AR933X_GPIO_FUNC_JTAG_DISABLE | AR933X_GPIO_FUNC_I2S_MCK_EN, 0);
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ath79_gpio_function2_setup(AR933X_GPIO_FUNC2_JUMPSTART_DISABLE, 0);
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printk("Setting DogStick2 GPIO\n");
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t = ath79_reset_rr(AR933X_RESET_REG_BOOTSTRAP);
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t |= AR933X_BOOTSTRAP_MDIO_GPIO_EN;
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ath79_reset_wr(AR933X_RESET_REG_BOOTSTRAP, t);
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// Put the avr reset to high
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if (gpio_request_one(DS_GPIO_AVR_RESET_DS2,
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GPIOF_OUT_INIT_LOW | GPIOF_EXPORT_DIR_FIXED, "OE-1") != 0)
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printk("Error setting GPIO OE\n");
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gpio_unexport(DS_GPIO_AVR_RESET_DS2);
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gpio_free(DS_GPIO_AVR_RESET_DS2);
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// enable OE of level shifter
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if (gpio_request_one(DS_GPIO_OE,
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GPIOF_OUT_INIT_HIGH | GPIOF_EXPORT_DIR_FIXED, "OE-1") != 0)
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printk("Error setting GPIO OE\n");
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if (gpio_request_one(DS_GPIO_UART_ENA,
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GPIOF_OUT_INIT_LOW | GPIOF_EXPORT_DIR_FIXED, "UART-ENA") != 0)
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printk("Error setting GPIO Uart Enable\n");
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// enable OE of level shifter
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if (gpio_request_one(DS_GPIO_OE2,
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GPIOF_OUT_INIT_HIGH | GPIOF_EXPORT_DIR_FIXED, "OE-2") != 0)
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printk("Error setting GPIO OE2\n");
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}
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MIPS_MACHINE(ATH79_MACH_ARDUINO_YUN, "Yun", "Arduino Yun", ds_setup);
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