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setup.c

/*
 * Board-specific setup code for the Merisc
 *
 * Copyright (C) 2008 Martinsson Elektronik AB
 *
 * 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/i2c.h>
#include <linux/i2c-gpio.h>
#include <linux/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 <linux/spi/ads7846.h>
#include <linux/irq.h>
#include <linux/fb.h>
#include <linux/atmel-mci.h>

#include <asm/io.h>
#include <asm/setup.h>
#include <asm/gpio.h>

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

#include "merisc.h"

/* Holds the autodetected board model and revision */
static int merisc_board_id;

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

/* 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 */
};

struct eth_addr {
      u8 addr[6];
};

static struct eth_addr __initdata hw_addr[2];
static struct eth_platform_data __initdata eth_data[2];

static int ads7846_get_pendown_state_PB26(void)
{
      return !gpio_get_value(GPIO_PIN_PB(26));
}

static int ads7846_get_pendown_state_PB28(void)
{
      return !gpio_get_value(GPIO_PIN_PB(28));
}

static struct ads7846_platform_data __initdata ads7846_data = {
      .model                        = 7846,
      .vref_delay_usecs       = 100,
      .vref_mv                = 0,
      .keep_vref_on                 = 0,
      .settle_delay_usecs           = 150,
      .penirq_recheck_delay_usecs   = 1,
      .x_plate_ohms                 = 800,
      .debounce_rep                 = 4,
      .debounce_max                 = 10,
      .debounce_tol                 = 50,
      .get_pendown_state            = ads7846_get_pendown_state_PB26,
      .filter_init                  = NULL,
      .filter                       = NULL,
      .filter_cleanup               = NULL,
};

static struct spi_board_info __initdata spi0_board_info[] = {
      {
            .modalias   = "ads7846",
            .max_speed_hz     = 3250000,
            .chip_select      = 0,
            .bus_num    = 0,
            .platform_data    = &ads7846_data,
            .mode       = SPI_MODE_0,
      },
};

static struct mci_platform_data __initdata mci0_data = {
      .slot[0] = {
            .bus_width        = 4,
            .detect_pin       = GPIO_PIN_PE(19),
            .wp_pin                 = GPIO_PIN_PE(20),
            .detect_is_active_high  = true,
      },
};

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;

      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);
}

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,
};

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[] = {
      {
            I2C_BOARD_INFO("pcf8563", 0x51)
      },
};

#ifdef CONFIG_LEDS_ATMEL_PWM
static struct gpio_led stk_pwm_led[] = {
      {
            .name = "backlight",
            .gpio = 0,        /* PWM channel 0 (LCD backlight) */
      },
};

static struct gpio_led_platform_data stk_pwm_led_data = {
      .num_leds   = ARRAY_SIZE(stk_pwm_led),
      .leds       = stk_pwm_led,
};

static struct platform_device stk_pwm_led_dev = {
      .name = "leds-atmel-pwm",
      .id   = -1,
      .dev  = {
            .platform_data    = &stk_pwm_led_data,
      },
};
#endif

const char *merisc_model(void)
{
      switch (merisc_board_id) {
      case 0:
      case 1:
            return "500-01";
      case 2:
            return "BT";
      default:
            return "Unknown";
      }
}

const char *merisc_revision(void)
{
      switch (merisc_board_id) {
      case 0:
            return "B";
      case 1:
            return "D";
      case 2:
            return "A";
      default:
            return "Unknown";
      }
}

static void detect_merisc_board_id(void)
{
      /* Board ID pins MUST be set as input or the board may be damaged */
      at32_select_gpio(GPIO_PIN_PA(24), AT32_GPIOF_PULLUP);
      at32_select_gpio(GPIO_PIN_PA(25), AT32_GPIOF_PULLUP);
      at32_select_gpio(GPIO_PIN_PA(26), AT32_GPIOF_PULLUP);
      at32_select_gpio(GPIO_PIN_PA(27), AT32_GPIOF_PULLUP);

      merisc_board_id = !gpio_get_value(GPIO_PIN_PA(24)) +
            !gpio_get_value(GPIO_PIN_PA(25)) * 2 +
            !gpio_get_value(GPIO_PIN_PA(26)) * 4 +
            !gpio_get_value(GPIO_PIN_PA(27)) * 8;
}

void __init setup_board(void)
{
      at32_map_usart(0, 0, 0);
      at32_map_usart(1, 1, 0);
      at32_map_usart(3, 3, 0);
      at32_setup_serial_console(1);
}

static int __init merisc_init(void)
{
      detect_merisc_board_id();

      printk(KERN_NOTICE "BOARD: Merisc %s revision %s\n", merisc_model(),
             merisc_revision());

      /* Reserve pins for SDRAM */
      at32_reserve_pin(GPIO_PIOE_BASE, ATMEL_EBI_PE_DATA_ALL | (1 << 26));

      if (merisc_board_id >= 1)
            at32_map_usart(2, 2, 0);

      at32_add_device_usart(0);
      at32_add_device_usart(1);
      if (merisc_board_id >= 1)
            at32_add_device_usart(2);
      at32_add_device_usart(3);
      set_hw_addr(at32_add_device_eth(0, &eth_data[0]));

      /* ADS7846 PENIRQ */
      if (merisc_board_id == 0) {
            ads7846_data.get_pendown_state = ads7846_get_pendown_state_PB26;
            at32_select_periph(GPIO_PIOB_BASE, 1 << 26,
                           GPIO_PERIPH_A, AT32_GPIOF_PULLUP);
            spi0_board_info[0].irq = AT32_EXTINT(1);
      } else {
            ads7846_data.get_pendown_state = ads7846_get_pendown_state_PB28;
            at32_select_periph(GPIO_PIOB_BASE, 1 << 28, GPIO_PERIPH_A,
                           AT32_GPIOF_PULLUP);
            spi0_board_info[0].irq = AT32_EXTINT(3);
      }

      /* ADS7846 busy pin */
      at32_select_gpio(GPIO_PIN_PA(4), AT32_GPIOF_PULLUP);

      at32_add_device_spi(0, spi0_board_info, ARRAY_SIZE(spi0_board_info));

      at32_add_device_mci(0, &mci0_data);

#ifdef CONFIG_LEDS_ATMEL_PWM
      at32_add_device_pwm((1 << 0) | (1 << 2));
      platform_device_register(&stk_pwm_led_dev);
#else
      at32_add_device_pwm((1 << 2));
#endif

      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(merisc_init);

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