fsg-setup.c

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/*
 * arch/arm/mach-ixp4xx/fsg-setup.c
 *
 * FSG 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: Rod Whitby <[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>

#define FSG_SDA_PIN     12
#define FSG_SCL_PIN     13

#define FSG_SB_GPIO     4   /* sync button */
#define FSG_RB_GPIO     9   /* reset button */
#define FSG_UB_GPIO     10  /* usb button */

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

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

static struct platform_device fsg_flash = {
    .name           = "IXP4XX-Flash",
    .id         = 0,
    .dev = {
        .platform_data  = &fsg_flash_data,
    },
    .num_resources      = 1,
    .resource       = &fsg_flash_resource,
};

static struct i2c_gpio_platform_data fsg_i2c_gpio_data = {
    .sda_pin        = FSG_SDA_PIN,
    .scl_pin        = FSG_SCL_PIN,
};

static struct platform_device fsg_i2c_gpio = {
    .name           = "i2c-gpio",
    .id         = 0,
    .dev = {
        .platform_data  = &fsg_i2c_gpio_data,
    },
};

static struct i2c_board_info __initdata fsg_i2c_board_info [] = {
    {
        I2C_BOARD_INFO("isl1208", 0x6f),
    },
};

static struct resource fsg_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 fsg_uart_data[] = {
    {
        .mapbase    = IXP4XX_UART1_BASE_PHYS,
        .membase    = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
        .irq        = IRQ_IXP4XX_UART1,
        .flags      = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
        .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 | UPF_SKIP_TEST,
        .iotype     = UPIO_MEM,
        .regshift   = 2,
        .uartclk    = IXP4XX_UART_XTAL,
    },
    { }
};

static struct platform_device fsg_uart = {
    .name           = "serial8250",
    .id         = PLAT8250_DEV_PLATFORM,
    .dev = {
        .platform_data  = fsg_uart_data,
    },
    .num_resources      = ARRAY_SIZE(fsg_uart_resources),
    .resource       = fsg_uart_resources,
};

static struct platform_device fsg_leds = {
    .name       = "fsg-led",
    .id     = -1,
};

/* Built-in 10/100 Ethernet MAC interfaces */
static struct eth_plat_info fsg_plat_eth[] = {
    {
        .phy        = 5,
        .rxq        = 3,
        .txreadyq   = 20,
    }, {
        .phy        = 4,
        .rxq        = 4,
        .txreadyq   = 21,
    }
};

static struct platform_device fsg_eth[] = {
    {
        .name           = "ixp4xx_eth",
        .id         = IXP4XX_ETH_NPEB,
        .dev = {
            .platform_data  = fsg_plat_eth,
        },
    }, {
        .name           = "ixp4xx_eth",
        .id         = IXP4XX_ETH_NPEC,
        .dev = {
            .platform_data  = fsg_plat_eth + 1,
        },
    }
};

static struct platform_device *fsg_devices[] __initdata = {
    &fsg_i2c_gpio,
    &fsg_flash,
    &fsg_leds,
    &fsg_eth[0],
    &fsg_eth[1],
};

static irqreturn_t fsg_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 fsg_reset_handler(int irq, void *dev_id)
{
    /* This is the paper-clip reset which does an emergency reboot. */
    printk(KERN_INFO "Restarting system.\n");
    machine_restart(NULL);

    /* This should never be reached. */
    return IRQ_HANDLED;
}

static void __init fsg_init(void)
{
    uint8_t __iomem *f;

    ixp4xx_sys_init();

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

    *IXP4XX_EXP_CS0 |= IXP4XX_FLASH_WRITABLE;
    *IXP4XX_EXP_CS1 = *IXP4XX_EXP_CS0;

    /* Configure CS2 for operation, 8bit and writable */
    *IXP4XX_EXP_CS2 = 0xbfff0002;

    i2c_register_board_info(0, fsg_i2c_board_info,
                ARRAY_SIZE(fsg_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(&fsg_uart);

    platform_add_devices(fsg_devices, ARRAY_SIZE(fsg_devices));

    if (request_irq(gpio_to_irq(FSG_RB_GPIO), &fsg_reset_handler,
            IRQF_DISABLED | IRQF_TRIGGER_LOW,
            "FSG reset button", NULL) < 0) {

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

    if (request_irq(gpio_to_irq(FSG_SB_GPIO), &fsg_power_handler,
            IRQF_DISABLED | IRQF_TRIGGER_LOW,
            "FSG power button", NULL) < 0) {

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

    /*
     * Map in a portion of the flash and read the MAC addresses.
     * 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), 0x400000);
    if (f) {
#ifdef __ARMEB__
        int i;
        for (i = 0; i < 6; i++) {
            fsg_plat_eth[0].hwaddr[i] = readb(f + 0x3C0422 + i);
            fsg_plat_eth[1].hwaddr[i] = readb(f + 0x3C043B + i);
        }
#else

        /*
          Endian-swapped reads from unaligned addresses are
          required to extract the two MACs from the big-endian
          Redboot config area in flash.
        */

        fsg_plat_eth[0].hwaddr[0] = readb(f + 0x3C0421);
        fsg_plat_eth[0].hwaddr[1] = readb(f + 0x3C0420);
        fsg_plat_eth[0].hwaddr[2] = readb(f + 0x3C0427);
        fsg_plat_eth[0].hwaddr[3] = readb(f + 0x3C0426);
        fsg_plat_eth[0].hwaddr[4] = readb(f + 0x3C0425);
        fsg_plat_eth[0].hwaddr[5] = readb(f + 0x3C0424);

        fsg_plat_eth[1].hwaddr[0] = readb(f + 0x3C0439);
        fsg_plat_eth[1].hwaddr[1] = readb(f + 0x3C043F);
        fsg_plat_eth[1].hwaddr[2] = readb(f + 0x3C043E);
        fsg_plat_eth[1].hwaddr[3] = readb(f + 0x3C043D);
        fsg_plat_eth[1].hwaddr[4] = readb(f + 0x3C043C);
        fsg_plat_eth[1].hwaddr[5] = readb(f + 0x3C0443);
#endif
        iounmap(f);
    }
    printk(KERN_INFO "FSG: Using MAC address %pM for port 0\n",
           fsg_plat_eth[0].hwaddr);
    printk(KERN_INFO "FSG: Using MAC address %pM for port 1\n",
           fsg_plat_eth[1].hwaddr);

}

MACHINE_START(FSG, "Freecom FSG-3")
    /* Maintainer: www.nslu2-linux.org */
    .map_io     = ixp4xx_map_io,
    .init_early = ixp4xx_init_early,
    .init_irq   = ixp4xx_init_irq,
    .timer      = &ixp4xx_timer,
    .atag_offset    = 0x100,
    .init_machine   = fsg_init,
#if defined(CONFIG_PCI)
    .dma_zone_size  = SZ_64M,
#endif
    .restart    = ixp4xx_restart,
MACHINE_END