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setup.c

/*
 * Board-specific setup code for the ATNGW100 Network Gateway
 *
 * Copyright (C) 2005-2006 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/clk.h>
#include <linux/etherdevice.h>
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/i2c.h>
#include <linux/i2c-gpio.h>
#include <linux/init.h>
#include <linux/linkage.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/leds.h>
#include <linux/spi/spi.h>

#include <asm/atmel-mci.h>
#include <asm/io.h>
#include <asm/setup.h>

#include <mach/at32ap700x.h>
#include <mach/board.h>
#include <mach/init.h>
#include <mach/portmux.h>

/* Oscillator frequencies. These are board-specific */
unsigned long at32_board_osc_rates[3] = {
      [0] = 32768,      /* 32.768 kHz on RTC osc */
      [1] = 20000000,   /* 20 MHz on osc0 */
      [2] = 12000000,   /* 12 MHz on osc1 */
};

/* Initialized by bootloader-specific startup code. */
struct tag *bootloader_tags __initdata;

struct eth_addr {
      u8 addr[6];
};
static struct eth_addr __initdata hw_addr[2];
static struct eth_platform_data __initdata eth_data[2];

static struct spi_board_info spi0_board_info[] __initdata = {
      {
            .modalias   = "mtd_dataflash",
            .max_speed_hz     = 8000000,
            .chip_select      = 0,
      },
};

static struct mci_platform_data __initdata mci0_data = {
      .slot[0] = {
            .bus_width  = 4,
#ifndef CONFIG_BOARD_ATNGW100_EVKLCD10X
            .detect_pin = GPIO_PIN_PC(25),
            .wp_pin           = GPIO_PIN_PE(0),
#else
            .detect_pin = GPIO_PIN_NONE,
            .wp_pin           = GPIO_PIN_NONE,
#endif
      },
};

/*
 * The next two functions should go away as the boot loader is
 * supposed to initialize the macb address registers with a valid
 * ethernet address. But we need to keep it around for a while until
 * we can be reasonably sure the boot loader does this.
 *
 * The phy_id is ignored as the driver will probe for it.
 */
static int __init parse_tag_ethernet(struct tag *tag)
{
      int i;

      i = tag->u.ethernet.mac_index;
      if (i < ARRAY_SIZE(hw_addr))
            memcpy(hw_addr[i].addr, tag->u.ethernet.hw_address,
                   sizeof(hw_addr[i].addr));

      return 0;
}
__tagtable(ATAG_ETHERNET, parse_tag_ethernet);

static void __init set_hw_addr(struct platform_device *pdev)
{
      struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
      const u8 *addr;
      void __iomem *regs;
      struct clk *pclk;

      if (!res)
            return;
      if (pdev->id >= ARRAY_SIZE(hw_addr))
            return;

      addr = hw_addr[pdev->id].addr;
      if (!is_valid_ether_addr(addr))
            return;

      /*
       * Since this is board-specific code, we'll cheat and use the
       * physical address directly as we happen to know that it's
       * the same as the virtual address.
       */
      regs = (void __iomem __force *)res->start;
      pclk = clk_get(&pdev->dev, "pclk");
      if (!pclk)
            return;

      clk_enable(pclk);
      __raw_writel((addr[3] << 24) | (addr[2] << 16)
                 | (addr[1] << 8) | addr[0], regs + 0x98);
      __raw_writel((addr[5] << 8) | addr[4], regs + 0x9c);
      clk_disable(pclk);
      clk_put(pclk);
}

void __init setup_board(void)
{
      at32_map_usart(1, 0);   /* USART 1: /dev/ttyS0, DB9 */
      at32_setup_serial_console(0);
}

static const struct gpio_led ngw_leds[] = {
      { .name = "sys", .gpio = GPIO_PIN_PA(16), .active_low = 1,
            .default_trigger = "heartbeat",
      },
      { .name = "a", .gpio = GPIO_PIN_PA(19), .active_low = 1, },
      { .name = "b", .gpio = GPIO_PIN_PE(19), .active_low = 1, },
};

static const struct gpio_led_platform_data ngw_led_data = {
      .num_leds = ARRAY_SIZE(ngw_leds),
      .leds =           (void *) ngw_leds,
};

static struct platform_device ngw_gpio_leds = {
      .name =           "leds-gpio",
      .id =       -1,
      .dev = {
            .platform_data = (void *) &ngw_led_data,
      }
};

static struct i2c_gpio_platform_data i2c_gpio_data = {
      .sda_pin          = GPIO_PIN_PA(6),
      .scl_pin          = GPIO_PIN_PA(7),
      .sda_is_open_drain      = 1,
      .scl_is_open_drain      = 1,
      .udelay                 = 2,  /* close to 100 kHz */
};

static struct platform_device i2c_gpio_device = {
      .name       = "i2c-gpio",
      .id         = 0,
      .dev        = {
            .platform_data    = &i2c_gpio_data,
      },
};

static struct i2c_board_info __initdata i2c_info[] = {
      /* NOTE:  original ATtiny24 firmware is at address 0x0b */
};

static int __init atngw100_init(void)
{
      unsigned    i;

      /*
       * ATNGW100 uses 16-bit SDRAM interface, so we don't need to
       * reserve any pins for it.
       */

      at32_add_device_usart(0);

      set_hw_addr(at32_add_device_eth(0, &eth_data[0]));
      set_hw_addr(at32_add_device_eth(1, &eth_data[1]));

      at32_add_device_spi(0, spi0_board_info, ARRAY_SIZE(spi0_board_info));
      at32_add_device_mci(0, &mci0_data);
      at32_add_device_usba(0, NULL);

      for (i = 0; i < ARRAY_SIZE(ngw_leds); i++) {
            at32_select_gpio(ngw_leds[i].gpio,
                        AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
      }
      platform_device_register(&ngw_gpio_leds);

      /* all these i2c/smbus pins should have external pullups for
       * open-drain sharing among all I2C devices.  SDA and SCL do;
       * PB28/EXTINT3 doesn't; it should be SMBALERT# (for PMBus),
       * but it's not available off-board.
       */
      at32_select_periph(GPIO_PIOB_BASE, 1 << 28, 0, AT32_GPIOF_PULLUP);
      at32_select_gpio(i2c_gpio_data.sda_pin,
            AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
      at32_select_gpio(i2c_gpio_data.scl_pin,
            AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
      platform_device_register(&i2c_gpio_device);
      i2c_register_board_info(0, i2c_info, ARRAY_SIZE(i2c_info));

      return 0;
}
postcore_initcall(atngw100_init);

static int __init atngw100_arch_init(void)
{
      /* PB30 is the otherwise unused jumper on the mainboard, with an
       * external pullup; the jumper grounds it.  Use it however you
       * like, including letting U-Boot or Linux tweak boot sequences.
       */
      at32_select_gpio(GPIO_PIN_PB(30), 0);
      gpio_request(GPIO_PIN_PB(30), "j15");
      gpio_direction_input(GPIO_PIN_PB(30));
      gpio_export(GPIO_PIN_PB(30), false);

      /* set_irq_type() after the arch_initcall for EIC has run, and
       * before the I2C subsystem could try using this IRQ.
       */
      return set_irq_type(AT32_EXTINT(3), IRQ_TYPE_EDGE_FALLING);
}
arch_initcall(atngw100_arch_init);

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