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nslu2-setup.c

/*
 * arch/arm/mach-ixp4xx/nslu2-setup.c
 *
 * NSLU2 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 nslu2-power.c:
 *    Copyright (C) 2005 Tower Technologies
 *
 * Author: Mark Rakes <mrakes at mac.com>
 * Author: Rod Whitby <rod@whitby.id.au>
 * Author: Alessandro Zummo <a.zummo@towertech.it>
 * Maintainers: http://www.nslu2-linux.org/
 *
 */

#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>
#include <asm/gpio.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 */
      .boot_params      = 0x00000100,
      .map_io           = ixp4xx_map_io,
      .init_irq   = ixp4xx_init_irq,
      .timer          = &nslu2_timer,
      .init_machine     = nslu2_init,
MACHINE_END

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