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nas100d-setup.c

/*
 * arch/arm/mach-ixp4xx/nas100d-setup.c
 *
 * NAS 100d board-setup
 *
 * Copyright (C) 2008 Rod Whitby <rod@whitby.id.au>
 *
 * based on ixdp425-setup.c:
 *      Copyright (C) 2003-2004 MontaVista Software, Inc.
 * based on nas100d-power.c:
 *    Copyright (C) 2005 Tower Technologies
 * based on nas100d-io.c
 *    Copyright (C) 2004 Karen Spearel
 *
 * Author: Alessandro Zummo <a.zummo@towertech.it>
 * Author: Rod Whitby <rod@whitby.id.au>
 * Maintainers: http://www.nslu2-linux.org/
 *
 */

#include <linux/if_ether.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 <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/flash.h>
#include <asm/io.h>
#include <asm/gpio.h>

static struct flash_platform_data nas100d_flash_data = {
      .map_name         = "cfi_probe",
      .width                  = 2,
};

static struct resource nas100d_flash_resource = {
      .flags                  = IORESOURCE_MEM,
};

static struct platform_device nas100d_flash = {
      .name             = "IXP4XX-Flash",
      .id               = 0,
      .dev.platform_data      = &nas100d_flash_data,
      .num_resources          = 1,
      .resource         = &nas100d_flash_resource,
};

static struct i2c_board_info __initdata nas100d_i2c_board_info [] = {
      {
            I2C_BOARD_INFO("pcf8563", 0x51),
      },
};

static struct gpio_led nas100d_led_pins[] = {
      {
            .name       = "nas100d:green:wlan",
            .gpio       = NAS100D_LED_WLAN_GPIO,
            .active_low = true,
      },
      {
            .name       = "nas100d:blue:power",  /* (off=flashing) */
            .gpio       = NAS100D_LED_PWR_GPIO,
            .active_low = true,
      },
      {
            .name       = "nas100d:yellow:disk",
            .gpio       = NAS100D_LED_DISK_GPIO,
            .active_low = true,
      },
};

static struct gpio_led_platform_data nas100d_led_data = {
      .num_leds         = ARRAY_SIZE(nas100d_led_pins),
      .leds             = nas100d_led_pins,
};

static struct platform_device nas100d_leds = {
      .name             = "leds-gpio",
      .id               = -1,
      .dev.platform_data      = &nas100d_led_data,
};

static struct i2c_gpio_platform_data nas100d_i2c_gpio_data = {
      .sda_pin          = NAS100D_SDA_PIN,
      .scl_pin          = NAS100D_SCL_PIN,
};

static struct platform_device nas100d_i2c_gpio = {
      .name             = "i2c-gpio",
      .id               = 0,
      .dev   = {
            .platform_data    = &nas100d_i2c_gpio_data,
      },
};

static struct resource nas100d_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 nas100d_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 nas100d_uart = {
      .name             = "serial8250",
      .id               = PLAT8250_DEV_PLATFORM,
      .dev.platform_data      = nas100d_uart_data,
      .num_resources          = 2,
      .resource         = nas100d_uart_resources,
};

/* Built-in 10/100 Ethernet MAC interfaces */
static struct eth_plat_info nas100d_plat_eth[] = {
      {
            .phy        = 0,
            .rxq        = 3,
            .txreadyq   = 20,
      }
};

static struct platform_device nas100d_eth[] = {
      {
            .name             = "ixp4xx_eth",
            .id               = IXP4XX_ETH_NPEB,
            .dev.platform_data      = nas100d_plat_eth,
      }
};

static struct platform_device *nas100d_devices[] __initdata = {
      &nas100d_i2c_gpio,
      &nas100d_flash,
      &nas100d_leds,
      &nas100d_eth[0],
};

static void nas100d_power_off(void)
{
      /* This causes the box to drop the power and go dead. */

      /* enable the pwr cntl gpio */
      gpio_line_config(NAS100D_PO_GPIO, IXP4XX_GPIO_OUT);

      /* do the deed */
      gpio_line_set(NAS100D_PO_GPIO, IXP4XX_GPIO_HIGH);
}

/* 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 nas100d_power_handler(unsigned long data);
static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler, 0, 0);

static void nas100d_power_handler(unsigned long data)
{
      /* This routine is called twice per second to check the
       * state of the power button.
       */

      if (gpio_get_value(NAS100D_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_line_set(NAS100D_LED_PWR_GPIO, IXP4XX_GPIO_LOW);
            } else {
                  power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
            }
      }

      mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
}

static irqreturn_t nas100d_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 nas100d_init(void)
{
      DECLARE_MAC_BUF(mac_buf);
      uint8_t __iomem *f;
      int i;

      ixp4xx_sys_init();

      /* gpio 14 and 15 are _not_ clocks */
      *IXP4XX_GPIO_GPCLKR = 0;

      nas100d_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
      nas100d_flash_resource.end =
            IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;

      i2c_register_board_info(0, nas100d_i2c_board_info,
                        ARRAY_SIZE(nas100d_i2c_board_info));

      /*
       * This is only useful on a modified machine, but it is valuable
       * to have it first in order to see debug messages, and so that
       * it does *not* get removed if platform_add_devices fails!
       */
      (void)platform_device_register(&nas100d_uart);

      platform_add_devices(nas100d_devices, ARRAY_SIZE(nas100d_devices));

      pm_power_off = nas100d_power_off;

      if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
            IRQF_DISABLED | IRQF_TRIGGER_LOW,
            "NAS100D reset button", NULL) < 0) {

            printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
                  gpio_to_irq(NAS100D_RB_GPIO));
      }

      /* The power button on the Iomega NAS100d is on GPIO 14, 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_line_config(NAS100D_PB_GPIO, IXP4XX_GPIO_IN);

      /* Set the initial value for the power button IRQ handler */
      power_button_countdown = PBUTTON_HOLDDOWN_COUNT;

      mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));

      /*
       * Map in a portion of the flash and read the MAC address.
       * Since it is stored in BE in the flash itself, we need to
       * byteswap it if we're in LE mode.
       */
      f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x1000000);
      if (f) {
            for (i = 0; i < 6; i++)
#ifdef __ARMEB__
                  nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + i);
#else
                  nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + (i^3));
#endif
            iounmap(f);
      }
      printk(KERN_INFO "NAS100D: Using MAC address %s for port 0\n",
             print_mac(mac_buf, nas100d_plat_eth[0].hwaddr));

}

MACHINE_START(NAS100D, "Iomega NAS 100d")
      /* Maintainer: www.nslu2-linux.org */
      .phys_io    = IXP4XX_PERIPHERAL_BASE_PHYS,
      .io_pg_offst      = ((IXP4XX_PERIPHERAL_BASE_VIRT) >> 18) & 0xFFFC,
      .boot_params      = 0x00000100,
      .map_io           = ixp4xx_map_io,
      .init_irq   = ixp4xx_init_irq,
      .timer          = &ixp4xx_timer,
      .init_machine     = nas100d_init,
MACHINE_END

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