/*
   * DSM-G600 board-setup
   *
   * Copyright (C) 2008 Rod Whitby <rod@whitby.id.au>
   * 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 <a.zummo@towertech.it>
   * Author: Michael Westerhof <mwester@dls.net>
   * Author: Rod Whitby <rod@whitby.id.au>
   * Maintainers: http://www.nslu2-linux.org/
   */
  #include <linux/gpio.h>
  #include <linux/irq.h>
  #include <linux/jiffies.h>
  #include <linux/timer.h>
  #include <linux/serial.h>
  #include <linux/serial_8250.h>
  #include <linux/leds.h>
  #include <linux/reboot.h>
  #include <linux/i2c.h>
  #include <linux/i2c-gpio.h>
  #include <linux/gpio.h>
  
  #include <mach/hardware.h>
  
  #include <asm/mach-types.h>
  #include <asm/mach/arch.h>
  #include <asm/mach/flash.h>
  #include <asm/mach/time.h>
  
  #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, 0, 0);
  
  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_DISABLED | IRQF_TRIGGER_LOW,
  		"DSM-G600 reset button", NULL) < 0) {
  
  		printk(KERN_DEBUG "Reset Button IRQ %d not available
  ",
  			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