// SPDX-License-Identifier: GPL-2.0 /* * DSM-G600 board-setup * * Copyright (C) 2008 Rod Whitby * Copyright (C) 2006 Tower Technologies * * based on ixdp425-setup.c: * Copyright (C) 2003-2004 MontaVista Software, Inc. * based on nslu2-power.c: * Copyright (C) 2005 Tower Technologies * based on nslu2-io.c: * Copyright (C) 2004 Karen Spearel * * Author: Alessandro Zummo * Author: Michael Westerhof * Author: Rod Whitby * Maintainers: http://www.nslu2-linux.org/ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define DSMG600_SDA_PIN 5 #define DSMG600_SCL_PIN 4 /* DSM-G600 Timer Setting */ #define DSMG600_FREQ 66000000 /* Buttons */ #define DSMG600_PB_GPIO 15 /* power button */ #define DSMG600_RB_GPIO 3 /* reset button */ /* Power control */ #define DSMG600_PO_GPIO 2 /* power off */ /* LEDs */ #define DSMG600_LED_PWR_GPIO 0 #define DSMG600_LED_WLAN_GPIO 14 static struct flash_platform_data dsmg600_flash_data = { .map_name = "cfi_probe", .width = 2, }; static struct resource dsmg600_flash_resource = { .flags = IORESOURCE_MEM, }; static struct platform_device dsmg600_flash = { .name = "IXP4XX-Flash", .id = 0, .dev.platform_data = &dsmg600_flash_data, .num_resources = 1, .resource = &dsmg600_flash_resource, }; static struct i2c_gpio_platform_data dsmg600_i2c_gpio_data = { .sda_pin = DSMG600_SDA_PIN, .scl_pin = DSMG600_SCL_PIN, }; static struct platform_device dsmg600_i2c_gpio = { .name = "i2c-gpio", .id = 0, .dev = { .platform_data = &dsmg600_i2c_gpio_data, }, }; static struct i2c_board_info __initdata dsmg600_i2c_board_info [] = { { I2C_BOARD_INFO("pcf8563", 0x51), }, }; static struct gpio_led dsmg600_led_pins[] = { { .name = "dsmg600:green:power", .gpio = DSMG600_LED_PWR_GPIO, }, { .name = "dsmg600:green:wlan", .gpio = DSMG600_LED_WLAN_GPIO, .active_low = true, }, }; static struct gpio_led_platform_data dsmg600_led_data = { .num_leds = ARRAY_SIZE(dsmg600_led_pins), .leds = dsmg600_led_pins, }; static struct platform_device dsmg600_leds = { .name = "leds-gpio", .id = -1, .dev.platform_data = &dsmg600_led_data, }; static struct resource dsmg600_uart_resources[] = { { .start = IXP4XX_UART1_BASE_PHYS, .end = IXP4XX_UART1_BASE_PHYS + 0x0fff, .flags = IORESOURCE_MEM, }, { .start = IXP4XX_UART2_BASE_PHYS, .end = IXP4XX_UART2_BASE_PHYS + 0x0fff, .flags = IORESOURCE_MEM, } }; static struct plat_serial8250_port dsmg600_uart_data[] = { { .mapbase = IXP4XX_UART1_BASE_PHYS, .membase = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET, .irq = IRQ_IXP4XX_UART1, .flags = UPF_BOOT_AUTOCONF, .iotype = UPIO_MEM, .regshift = 2, .uartclk = IXP4XX_UART_XTAL, }, { .mapbase = IXP4XX_UART2_BASE_PHYS, .membase = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET, .irq = IRQ_IXP4XX_UART2, .flags = UPF_BOOT_AUTOCONF, .iotype = UPIO_MEM, .regshift = 2, .uartclk = IXP4XX_UART_XTAL, }, { } }; static struct platform_device dsmg600_uart = { .name = "serial8250", .id = PLAT8250_DEV_PLATFORM, .dev.platform_data = dsmg600_uart_data, .num_resources = ARRAY_SIZE(dsmg600_uart_resources), .resource = dsmg600_uart_resources, }; static struct platform_device *dsmg600_devices[] __initdata = { &dsmg600_i2c_gpio, &dsmg600_flash, &dsmg600_leds, }; static void dsmg600_power_off(void) { /* enable the pwr cntl and drive it high */ gpio_direction_output(DSMG600_PO_GPIO, 1); } /* This is used to make sure the power-button pusher is serious. The button * must be held until the value of this counter reaches zero. */ static int power_button_countdown; /* Must hold the button down for at least this many counts to be processed */ #define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */ static void dsmg600_power_handler(unsigned long data); static DEFINE_TIMER(dsmg600_power_timer, dsmg600_power_handler); static void dsmg600_power_handler(unsigned long data) { /* This routine is called twice per second to check the * state of the power button. */ if (gpio_get_value(DSMG600_PB_GPIO)) { /* IO Pin is 1 (button pushed) */ if (power_button_countdown > 0) power_button_countdown--; } else { /* Done on button release, to allow for auto-power-on mods. */ if (power_button_countdown == 0) { /* Signal init to do the ctrlaltdel action, * this will bypass init if it hasn't started * and do a kernel_restart. */ ctrl_alt_del(); /* Change the state of the power LED to "blink" */ gpio_set_value(DSMG600_LED_PWR_GPIO, 0); } else { power_button_countdown = PBUTTON_HOLDDOWN_COUNT; } } mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500)); } static irqreturn_t dsmg600_reset_handler(int irq, void *dev_id) { /* This is the paper-clip reset, it shuts the machine down directly. */ machine_power_off(); return IRQ_HANDLED; } static void __init dsmg600_timer_init(void) { /* The xtal on this machine is non-standard. */ ixp4xx_timer_freq = DSMG600_FREQ; /* Call standard timer_init function. */ ixp4xx_timer_init(); } static int __init dsmg600_gpio_init(void) { if (!machine_is_dsmg600()) return 0; gpio_request(DSMG600_RB_GPIO, "reset button"); if (request_irq(gpio_to_irq(DSMG600_RB_GPIO), &dsmg600_reset_handler, IRQF_TRIGGER_LOW, "DSM-G600 reset button", NULL) < 0) { printk(KERN_DEBUG "Reset Button IRQ %d not available\n", gpio_to_irq(DSMG600_RB_GPIO)); } /* * The power button on the D-Link DSM-G600 is on GPIO 15, but * it cannot handle interrupts on that GPIO line. So we'll * have to poll it with a kernel timer. */ /* Make sure that the power button GPIO is set up as an input */ gpio_request(DSMG600_PB_GPIO, "power button"); gpio_direction_input(DSMG600_PB_GPIO); /* Request poweroff GPIO line */ gpio_request(DSMG600_PO_GPIO, "power off button"); /* Set the initial value for the power button IRQ handler */ power_button_countdown = PBUTTON_HOLDDOWN_COUNT; mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500)); return 0; } device_initcall(dsmg600_gpio_init); static void __init dsmg600_init(void) { ixp4xx_sys_init(); /* Make sure that GPIO14 and GPIO15 are not used as clocks */ *IXP4XX_GPIO_GPCLKR = 0; dsmg600_flash_resource.start = IXP4XX_EXP_BUS_BASE(0); dsmg600_flash_resource.end = IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1; i2c_register_board_info(0, dsmg600_i2c_board_info, ARRAY_SIZE(dsmg600_i2c_board_info)); /* The UART is required on the DSM-G600 (Redboot cannot use the * NIC) -- do it here so that it does *not* get removed if * platform_add_devices fails! */ (void)platform_device_register(&dsmg600_uart); platform_add_devices(dsmg600_devices, ARRAY_SIZE(dsmg600_devices)); pm_power_off = dsmg600_power_off; } MACHINE_START(DSMG600, "D-Link DSM-G600 RevA") /* Maintainer: www.nslu2-linux.org */ .atag_offset = 0x100, .map_io = ixp4xx_map_io, .init_early = ixp4xx_init_early, .init_irq = ixp4xx_init_irq, .init_time = dsmg600_timer_init, .init_machine = dsmg600_init, #if defined(CONFIG_PCI) .dma_zone_size = SZ_64M, #endif .restart = ixp4xx_restart, MACHINE_END