setup.c

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/*
 * 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 macb_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 (IS_ERR(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);