nslu2-setup.c

Go to the documentation of this file.

/*
 * arch/arm/mach-ixp4xx/nslu2-setup.c
 *
 * NSLU2 board-setup
 *
 * Copyright (C) 2008 Rod Whitby <[email protected]>
 *
 * based on ixdp425-setup.c:
 *      Copyright (C) 2003-2004 MontaVista Software, Inc.
 * based on nslu2-power.c:
 *  Copyright (C) 2005 Tower Technologies
 *
 * Author: Mark Rakes <mrakes at mac.com>
 * Author: Rod Whitby <[email protected]>
 * Author: Alessandro Zummo <[email protected]>
 * Maintainers: http://www.nslu2-linux.org/
 *
 */
#include <linux/gpio.h>
#include <linux/if_ether.h>
#include <linux/irq.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/io.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/flash.h>
#include <asm/mach/time.h>

#define NSLU2_SDA_PIN       7
#define NSLU2_SCL_PIN       6

/* NSLU2 Timer */
#define NSLU2_FREQ 66000000

/* Buttons */
#define NSLU2_PB_GPIO       5   /* power button */
#define NSLU2_PO_GPIO       8   /* power off */
#define NSLU2_RB_GPIO       12  /* reset button */

/* Buzzer */
#define NSLU2_GPIO_BUZZ     4

/* LEDs */
#define NSLU2_LED_RED_GPIO  0
#define NSLU2_LED_GRN_GPIO  1
#define NSLU2_LED_DISK1_GPIO    3
#define NSLU2_LED_DISK2_GPIO    2

static struct flash_platform_data nslu2_flash_data = {
    .map_name       = "cfi_probe",
    .width          = 2,
};

static struct resource nslu2_flash_resource = {
    .flags          = IORESOURCE_MEM,
};

static struct platform_device nslu2_flash = {
    .name           = "IXP4XX-Flash",
    .id         = 0,
    .dev.platform_data  = &nslu2_flash_data,
    .num_resources      = 1,
    .resource       = &nslu2_flash_resource,
};

static struct i2c_gpio_platform_data nslu2_i2c_gpio_data = {
    .sda_pin        = NSLU2_SDA_PIN,
    .scl_pin        = NSLU2_SCL_PIN,
};

static struct i2c_board_info __initdata nslu2_i2c_board_info [] = {
    {
        I2C_BOARD_INFO("x1205", 0x6f),
    },
};

static struct gpio_led nslu2_led_pins[] = {
    {
        .name       = "nslu2:green:ready",
        .gpio       = NSLU2_LED_GRN_GPIO,
    },
    {
        .name       = "nslu2:red:status",
        .gpio       = NSLU2_LED_RED_GPIO,
    },
    {
        .name       = "nslu2:green:disk-1",
        .gpio       = NSLU2_LED_DISK1_GPIO,
        .active_low = true,
    },
    {
        .name       = "nslu2:green:disk-2",
        .gpio       = NSLU2_LED_DISK2_GPIO,
        .active_low = true,
    },
};

static struct gpio_led_platform_data nslu2_led_data = {
    .num_leds       = ARRAY_SIZE(nslu2_led_pins),
    .leds           = nslu2_led_pins,
};

static struct platform_device nslu2_leds = {
    .name           = "leds-gpio",
    .id         = -1,
    .dev.platform_data  = &nslu2_led_data,
};

static struct platform_device nslu2_i2c_gpio = {
    .name           = "i2c-gpio",
    .id         = 0,
    .dev     = {
        .platform_data  = &nslu2_i2c_gpio_data,
    },
};

static struct platform_device nslu2_beeper = {
    .name           = "ixp4xx-beeper",
    .id         = NSLU2_GPIO_BUZZ,
    .num_resources      = 0,
};

static struct resource nslu2_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 nslu2_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 nslu2_uart = {
    .name           = "serial8250",
    .id         = PLAT8250_DEV_PLATFORM,
    .dev.platform_data  = nslu2_uart_data,
    .num_resources      = 2,
    .resource       = nslu2_uart_resources,
};

/* Built-in 10/100 Ethernet MAC interfaces */
static struct eth_plat_info nslu2_plat_eth[] = {
    {
        .phy        = 1,
        .rxq        = 3,
        .txreadyq   = 20,
    }
};

static struct platform_device nslu2_eth[] = {
    {
        .name           = "ixp4xx_eth",
        .id         = IXP4XX_ETH_NPEB,
        .dev.platform_data  = nslu2_plat_eth,
    }
};

static struct platform_device *nslu2_devices[] __initdata = {
    &nslu2_i2c_gpio,
    &nslu2_flash,
    &nslu2_beeper,
    &nslu2_leds,
    &nslu2_eth[0],
};

static void nslu2_power_off(void)
{
    /* This causes the box to drop the power and go dead. */

    /* enable the pwr cntl gpio */
    gpio_line_config(NSLU2_PO_GPIO, IXP4XX_GPIO_OUT);

    /* do the deed */
    gpio_line_set(NSLU2_PO_GPIO, IXP4XX_GPIO_HIGH);
}

static irqreturn_t nslu2_power_handler(int irq, void *dev_id)
{
    /* Signal init to do the ctrlaltdel action, this will bypass init if
     * it hasn't started and do a kernel_restart.
     */
    ctrl_alt_del();

    return IRQ_HANDLED;
}

static irqreturn_t nslu2_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 nslu2_timer_init(void)
{
    /* The xtal on this machine is non-standard. */
    ixp4xx_timer_freq = NSLU2_FREQ;

    /* Call standard timer_init function. */
    ixp4xx_timer_init();
}

static struct sys_timer nslu2_timer = {
    .init   = nslu2_timer_init,
};

static void __init nslu2_init(void)
{
    uint8_t __iomem *f;
    int i;

    ixp4xx_sys_init();

    nslu2_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
    nslu2_flash_resource.end =
        IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;

    i2c_register_board_info(0, nslu2_i2c_board_info,
                ARRAY_SIZE(nslu2_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(&nslu2_uart);

    platform_add_devices(nslu2_devices, ARRAY_SIZE(nslu2_devices));

    pm_power_off = nslu2_power_off;

    if (request_irq(gpio_to_irq(NSLU2_RB_GPIO), &nslu2_reset_handler,
        IRQF_DISABLED | IRQF_TRIGGER_LOW,
        "NSLU2 reset button", NULL) < 0) {

        printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
            gpio_to_irq(NSLU2_RB_GPIO));
    }

    if (request_irq(gpio_to_irq(NSLU2_PB_GPIO), &nslu2_power_handler,
        IRQF_DISABLED | IRQF_TRIGGER_HIGH,
        "NSLU2 power button", NULL) < 0) {

        printk(KERN_DEBUG "Power Button IRQ %d not available\n",
            gpio_to_irq(NSLU2_PB_GPIO));
    }

    /*
     * 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), 0x40000);
    if (f) {
        for (i = 0; i < 6; i++)
#ifdef __ARMEB__
            nslu2_plat_eth[0].hwaddr[i] = readb(f + 0x3FFB0 + i);
#else
            nslu2_plat_eth[0].hwaddr[i] = readb(f + 0x3FFB0 + (i^3));
#endif
        iounmap(f);
    }
    printk(KERN_INFO "NSLU2: Using MAC address %pM for port 0\n",
           nslu2_plat_eth[0].hwaddr);

}

MACHINE_START(NSLU2, "Linksys NSLU2")
    /* Maintainer: www.nslu2-linux.org */
    .atag_offset    = 0x100,
    .map_io     = ixp4xx_map_io,
    .init_early = ixp4xx_init_early,
    .init_irq   = ixp4xx_init_irq,
    .timer          = &nslu2_timer,
    .init_machine   = nslu2_init,
#if defined(CONFIG_PCI)
    .dma_zone_size  = SZ_64M,
#endif
    .restart    = ixp4xx_restart,
MACHINE_END