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dsmg600-setup.c

/*
 * 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/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/mach/time.h>
#include <asm/gpio.h>

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 gpio */
      gpio_line_config(DSMG600_PO_GPIO, IXP4XX_GPIO_OUT);

      /* poweroff */
      gpio_line_set(DSMG600_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 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_line_set(DSMG600_LED_PWR_GPIO, IXP4XX_GPIO_LOW);
            } 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 struct sys_timer dsmg600_timer = {
    .init   = dsmg600_timer_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;

      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\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_line_config(DSMG600_PB_GPIO, IXP4XX_GPIO_IN);

      /* 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));
}

MACHINE_START(DSMG600, "D-Link DSM-G600 RevA")
      /* 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          = &dsmg600_timer,
      .init_machine     = dsmg600_init,
MACHINE_END

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