nxp-imx6sx-sdk/apps/common/platform_init.c

/*
 * Copyright (c) 2012, Freescale Semiconductor, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * o Redistributions of source code must retain the above copyright notice, this list
 *   of conditions and the following disclaimer.
 *
 * o Redistributions in binary form must reproduce the above copyright notice, this
 *   list of conditions and the following disclaimer in the documentation and/or
 *   other materials provided with the distribution.
 *
 * o Neither the name of Freescale Semiconductor, Inc. nor the names of its
 *   contributors may be used to endorse or promote products derived from this
 *   software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "sdk.h"
#include "board_io_expanders.h"
#include "platform_init.h"
#include "core/cortex_a9.h"
#include "core/mmu.h"

////////////////////////////////////////////////////////////////////////////////
// Code
////////////////////////////////////////////////////////////////////////////////

void platform_init(void)
{
    enable_neon_fpu();
    disable_strict_align_check();
    mmu_init();

    // Map some SDRAM for DMA
#if defined(BOARD_EVB)
    mmu_map_l1_range(0x30000000, 0x30000000, 0x70000000, kNoncacheable, kShareable, kRWAccess);
#elif defined(BOARD_SMART_DEVICE)
    mmu_map_l1_range(0x20000000, 0x20000000, 0x30000000, kNoncacheable, kShareable, kRWAccess);
#endif

    // Enable interrupts. Until this point, the startup code has left interrupts disabled.
    gic_init();
    arm_set_interrupt_state(true);
    
    // Initialize clock sources, dividers, ... 
    ccm_init();
    
    // Configure the EPIT timer used for system delay function. 
    system_time_init();
    
    // Initialize the debug/console UART 
    uart_init(g_debug_uart_port, 115200, PARITY_NONE, STOPBITS_ONE, EIGHTBITS, FLOWCTRL_OFF);

    // flush UART RX FIFO 
    uint8_t c;
    do {
        c = uart_getchar(g_debug_uart_port);
    } while (c != NONE_CHAR);

    // Some init for the board 
    board_ioexpander_init();
}

////////////////////////////////////////////////////////////////////////////////
// EOF
////////////////////////////////////////////////////////////////////////////////