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304 lines
7.6 KiB
304 lines
7.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* DSM-G600 board-setup |
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* |
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* Copyright (C) 2008 Rod Whitby <[email protected]> |
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* Copyright (C) 2006 Tower Technologies |
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* |
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* based on ixdp425-setup.c: |
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* Copyright (C) 2003-2004 MontaVista Software, Inc. |
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* based on nslu2-power.c: |
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* Copyright (C) 2005 Tower Technologies |
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* based on nslu2-io.c: |
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* Copyright (C) 2004 Karen Spearel |
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* |
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* Author: Alessandro Zummo <[email protected]> |
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* Author: Michael Westerhof <[email protected]> |
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* Author: Rod Whitby <[email protected]> |
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* Maintainers: http://www.nslu2-linux.org/ |
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*/ |
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#include <linux/gpio.h> |
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#include <linux/irq.h> |
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#include <linux/jiffies.h> |
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#include <linux/timer.h> |
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#include <linux/serial.h> |
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#include <linux/serial_8250.h> |
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#include <linux/leds.h> |
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#include <linux/reboot.h> |
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#include <linux/i2c.h> |
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#include <linux/gpio/machine.h> |
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#include <mach/hardware.h> |
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#include <asm/mach-types.h> |
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#include <asm/mach/arch.h> |
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#include <asm/mach/flash.h> |
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#include <asm/mach/time.h> |
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#include "irqs.h" |
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#define DSMG600_SDA_PIN 5 |
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#define DSMG600_SCL_PIN 4 |
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/* DSM-G600 Timer Setting */ |
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#define DSMG600_FREQ 66000000 |
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/* Buttons */ |
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#define DSMG600_PB_GPIO 15 /* power button */ |
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#define DSMG600_RB_GPIO 3 /* reset button */ |
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/* Power control */ |
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#define DSMG600_PO_GPIO 2 /* power off */ |
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/* LEDs */ |
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#define DSMG600_LED_PWR_GPIO 0 |
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#define DSMG600_LED_WLAN_GPIO 14 |
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static struct flash_platform_data dsmg600_flash_data = { |
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.map_name = "cfi_probe", |
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.width = 2, |
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}; |
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static struct resource dsmg600_flash_resource = { |
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.flags = IORESOURCE_MEM, |
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}; |
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static struct platform_device dsmg600_flash = { |
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.name = "IXP4XX-Flash", |
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.id = 0, |
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.dev.platform_data = &dsmg600_flash_data, |
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.num_resources = 1, |
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.resource = &dsmg600_flash_resource, |
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}; |
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static struct gpiod_lookup_table dsmg600_i2c_gpiod_table = { |
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.dev_id = "i2c-gpio.0", |
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.table = { |
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GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SDA_PIN, |
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NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), |
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GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SCL_PIN, |
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NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), |
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}, |
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}; |
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static struct platform_device dsmg600_i2c_gpio = { |
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.name = "i2c-gpio", |
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.id = 0, |
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.dev = { |
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.platform_data = NULL, |
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}, |
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}; |
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static struct i2c_board_info __initdata dsmg600_i2c_board_info [] = { |
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{ |
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I2C_BOARD_INFO("pcf8563", 0x51), |
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}, |
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}; |
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static struct gpio_led dsmg600_led_pins[] = { |
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{ |
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.name = "dsmg600:green:power", |
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.gpio = DSMG600_LED_PWR_GPIO, |
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}, |
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{ |
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.name = "dsmg600:green:wlan", |
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.gpio = DSMG600_LED_WLAN_GPIO, |
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.active_low = true, |
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}, |
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}; |
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static struct gpio_led_platform_data dsmg600_led_data = { |
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.num_leds = ARRAY_SIZE(dsmg600_led_pins), |
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.leds = dsmg600_led_pins, |
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}; |
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static struct platform_device dsmg600_leds = { |
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.name = "leds-gpio", |
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.id = -1, |
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.dev.platform_data = &dsmg600_led_data, |
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}; |
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static struct resource dsmg600_uart_resources[] = { |
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{ |
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.start = IXP4XX_UART1_BASE_PHYS, |
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.end = IXP4XX_UART1_BASE_PHYS + 0x0fff, |
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.flags = IORESOURCE_MEM, |
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}, |
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{ |
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.start = IXP4XX_UART2_BASE_PHYS, |
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.end = IXP4XX_UART2_BASE_PHYS + 0x0fff, |
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.flags = IORESOURCE_MEM, |
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} |
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}; |
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static struct plat_serial8250_port dsmg600_uart_data[] = { |
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{ |
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.mapbase = IXP4XX_UART1_BASE_PHYS, |
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.membase = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET, |
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.irq = IRQ_IXP4XX_UART1, |
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.flags = UPF_BOOT_AUTOCONF, |
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.iotype = UPIO_MEM, |
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.regshift = 2, |
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.uartclk = IXP4XX_UART_XTAL, |
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}, |
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{ |
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.mapbase = IXP4XX_UART2_BASE_PHYS, |
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.membase = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET, |
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.irq = IRQ_IXP4XX_UART2, |
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.flags = UPF_BOOT_AUTOCONF, |
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.iotype = UPIO_MEM, |
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.regshift = 2, |
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.uartclk = IXP4XX_UART_XTAL, |
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}, |
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{ } |
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}; |
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static struct platform_device dsmg600_uart = { |
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.name = "serial8250", |
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.id = PLAT8250_DEV_PLATFORM, |
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.dev.platform_data = dsmg600_uart_data, |
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.num_resources = ARRAY_SIZE(dsmg600_uart_resources), |
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.resource = dsmg600_uart_resources, |
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}; |
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static struct platform_device *dsmg600_devices[] __initdata = { |
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&dsmg600_i2c_gpio, |
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&dsmg600_flash, |
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&dsmg600_leds, |
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}; |
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static void dsmg600_power_off(void) |
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{ |
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/* enable the pwr cntl and drive it high */ |
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gpio_direction_output(DSMG600_PO_GPIO, 1); |
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} |
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/* This is used to make sure the power-button pusher is serious. The button |
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* must be held until the value of this counter reaches zero. |
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*/ |
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static int power_button_countdown; |
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/* Must hold the button down for at least this many counts to be processed */ |
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#define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */ |
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static void dsmg600_power_handler(struct timer_list *unused); |
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static DEFINE_TIMER(dsmg600_power_timer, dsmg600_power_handler); |
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static void dsmg600_power_handler(struct timer_list *unused) |
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{ |
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/* This routine is called twice per second to check the |
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* state of the power button. |
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*/ |
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if (gpio_get_value(DSMG600_PB_GPIO)) { |
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/* IO Pin is 1 (button pushed) */ |
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if (power_button_countdown > 0) |
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power_button_countdown--; |
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} else { |
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/* Done on button release, to allow for auto-power-on mods. */ |
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if (power_button_countdown == 0) { |
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/* Signal init to do the ctrlaltdel action, |
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* this will bypass init if it hasn't started |
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* and do a kernel_restart. |
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*/ |
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ctrl_alt_del(); |
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/* Change the state of the power LED to "blink" */ |
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gpio_set_value(DSMG600_LED_PWR_GPIO, 0); |
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} else { |
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power_button_countdown = PBUTTON_HOLDDOWN_COUNT; |
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} |
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} |
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mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500)); |
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} |
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static irqreturn_t dsmg600_reset_handler(int irq, void *dev_id) |
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{ |
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/* This is the paper-clip reset, it shuts the machine down directly. */ |
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machine_power_off(); |
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return IRQ_HANDLED; |
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} |
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static void __init dsmg600_timer_init(void) |
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{ |
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/* The xtal on this machine is non-standard. */ |
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ixp4xx_timer_freq = DSMG600_FREQ; |
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/* Call standard timer_init function. */ |
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ixp4xx_timer_init(); |
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} |
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static int __init dsmg600_gpio_init(void) |
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{ |
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if (!machine_is_dsmg600()) |
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return 0; |
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gpio_request(DSMG600_RB_GPIO, "reset button"); |
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if (request_irq(gpio_to_irq(DSMG600_RB_GPIO), &dsmg600_reset_handler, |
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IRQF_TRIGGER_LOW, "DSM-G600 reset button", NULL) < 0) { |
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printk(KERN_DEBUG "Reset Button IRQ %d not available\n", |
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gpio_to_irq(DSMG600_RB_GPIO)); |
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} |
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/* |
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* The power button on the D-Link DSM-G600 is on GPIO 15, but |
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* it cannot handle interrupts on that GPIO line. So we'll |
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* have to poll it with a kernel timer. |
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*/ |
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/* Make sure that the power button GPIO is set up as an input */ |
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gpio_request(DSMG600_PB_GPIO, "power button"); |
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gpio_direction_input(DSMG600_PB_GPIO); |
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/* Request poweroff GPIO line */ |
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gpio_request(DSMG600_PO_GPIO, "power off button"); |
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/* Set the initial value for the power button IRQ handler */ |
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power_button_countdown = PBUTTON_HOLDDOWN_COUNT; |
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mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500)); |
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return 0; |
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} |
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device_initcall(dsmg600_gpio_init); |
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static void __init dsmg600_init(void) |
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{ |
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ixp4xx_sys_init(); |
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dsmg600_flash_resource.start = IXP4XX_EXP_BUS_BASE(0); |
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dsmg600_flash_resource.end = |
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IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1; |
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gpiod_add_lookup_table(&dsmg600_i2c_gpiod_table); |
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i2c_register_board_info(0, dsmg600_i2c_board_info, |
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ARRAY_SIZE(dsmg600_i2c_board_info)); |
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/* The UART is required on the DSM-G600 (Redboot cannot use the |
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* NIC) -- do it here so that it does *not* get removed if |
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* platform_add_devices fails! |
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*/ |
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(void)platform_device_register(&dsmg600_uart); |
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platform_add_devices(dsmg600_devices, ARRAY_SIZE(dsmg600_devices)); |
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pm_power_off = dsmg600_power_off; |
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} |
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MACHINE_START(DSMG600, "D-Link DSM-G600 RevA") |
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/* Maintainer: www.nslu2-linux.org */ |
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.atag_offset = 0x100, |
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.map_io = ixp4xx_map_io, |
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.init_early = ixp4xx_init_early, |
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.init_irq = ixp4xx_init_irq, |
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.init_time = dsmg600_timer_init, |
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.init_machine = dsmg600_init, |
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#if defined(CONFIG_PCI) |
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.dma_zone_size = SZ_64M, |
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#endif |
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.restart = ixp4xx_restart, |
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MACHINE_END
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