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fsg-setup.c

/*
 * arch/arm/mach-ixp4xx/fsg-setup.c
 *
 * FSG 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: Rod Whitby <rod@whitby.id.au>
 * 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 <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/flash.h>
#include <asm/io.h>
#include <asm/gpio.h>

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)
{
      DECLARE_MAC_BUF(mac_buf);
      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 %s for port 0\n",
             print_mac(mac_buf, fsg_plat_eth[0].hwaddr));
      printk(KERN_INFO "FSG: Using MAC address %s for port 1\n",
             print_mac(mac_buf, fsg_plat_eth[1].hwaddr));

}

MACHINE_START(FSG, "Freecom FSG-3")
      /* Maintainer: www.nslu2-linux.org */
      .phys_io    = IXP4XX_PERIPHERAL_BASE_PHYS,
      .io_pg_offst      = ((IXP4XX_PERIPHERAL_BASE_VIRT) >> 18) & 0xfffc,
      .map_io           = ixp4xx_map_io,
      .init_irq   = ixp4xx_init_irq,
      .timer            = &ixp4xx_timer,
      .boot_params      = 0x0100,
      .init_machine     = fsg_init,
MACHINE_END


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