dsmg600-setup.c

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/*
 * DSM-G600 board-setup
 *
 * Copyright (C) 2008 Rod Whitby <[email protected]>
 * 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 <[email protected]>
 * Author: Michael Westerhof <[email protected]>
 * Author: Rod Whitby <[email protected]>
 * 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 <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 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 */
    .atag_offset    = 0x100,
    .map_io     = ixp4xx_map_io,
    .init_early = ixp4xx_init_early,
    .init_irq   = ixp4xx_init_irq,
    .timer          = &dsmg600_timer,
    .init_machine   = dsmg600_init,
#if defined(CONFIG_PCI)
    .dma_zone_size  = SZ_64M,
#endif
    .restart    = ixp4xx_restart,
MACHINE_END