Mity CPU Platforms » MityDSP-L138 (ARM9 Based Platforms)

/**

 * \file  startup.c

 *

 * \brief Configures the PLL registers to achieve the required Operating

 *        frequency. Power and sleep controller is activated for UART and

 *        Interuppt controller. Interrupt vector is copied to the shared Ram.

 *        After doing all the above, controller is given to the application.

 */

/*

* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/

*

*  Redistribution and use in source and binary forms, with or without

*  modification, are permitted provided that the following conditions

*  are met:

*

*    Redistributions of source code must retain the above copyright

*    notice, this list of conditions and the following disclaimer.

*

*    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.

*

*    Neither the name of Texas Instruments Incorporated 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

*  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

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*  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

#include "hw_syscfg0_OMAPL138.h"

#include "hw_syscfg1_OMAPL138.h"

#include "hw_pllc_OMAPL138.h"

#include "soc_OMAPL138.h"

#include "evmOMAPL138.h"

#include "hw_types.h"

#include "hw_ddr2_mddr.h"

#include "psc.h"

#define E_PASS    0

#define E_FAIL    -1

/***********************************************************************

**                     EXTERNAL FUNCTION PROTOTYPES

***********************************************************************/

extern void Entry(void);

extern void UndefInstHandler(void);

extern void SWIHandler(void);

extern void AbortHandler(void);

extern void IRQHandler(void);

extern void FIQHandler(void);

/**********************************************************************

*                   INTERNAL FUNCTION PROTOTYPES

**********************************************************************/

unsigned int PLL0Init(unsigned char clk_src, unsigned char pllm,

                      unsigned char prediv, unsigned char postdiv,

                      unsigned char div1, unsigned char div3,

                      unsigned char div7);

unsigned int PLL1Init(unsigned char pllm, unsigned char postdiv,

                      unsigned char div1, unsigned char div2,

                      unsigned char div3);

unsigned int DDR_Init ( unsigned int freq );

static void CopyVectorTable(void);

void BootAbort(void);

int main(void);

/******************************************************************************

**                      INTERNAL VARIABLE DEFINITIONS

*******************************************************************************/

static unsigned int const vecTbl[14]=

{

    0xE59FF018,

    0xE59FF018,

    0xE59FF018,

    0xE59FF018,

    0xE59FF014,

    0xE24FF008,

    0xE59FF010,

    0xE59FF010,

    (unsigned int)Entry,

    (unsigned int)UndefInstHandler,

    (unsigned int)SWIHandler,

    (unsigned int)AbortHandler,

    (unsigned int)IRQHandler,

    (unsigned int)FIQHandler

};

/******************************************************************************

**                          FUNCTION DEFINITIONS

*******************************************************************************/

/**

 * \brief   Boot strap function which enables the PLL(s) and PSC(s) for basic

 *          module(s)

 *

 * \param   none

 *

 * \return  None.

 * 

 * This function is the first function that needs to be called in a system.

 * This should be set as the entry point in the linker script if loading the

 * elf binary via a debugger, on the target. This function never returns, but

 * gives control to the application entry point

 **/

unsigned int start_boot(void) 

{

    /* Enable write-protection for registers of SYSCFG module. */

    SysCfgRegistersLock();

    /* Disable write-protection for registers of SYSCFG module. */

    SysCfgRegistersUnlock();

    asm("    mrc p15, #0, r0, c1, c0, #0\n\t"

        "    orr r0, r0, #0x00002000\n\t"

        "    mcr p15, #0, r0, c1, c0, #0\n\t");

    PSCModuleControl(SOC_PSC_1_REGS, HW_PSC_UART2, 0, PSC_MDCTL_NEXT_ENABLE);

    PSCModuleControl(SOC_PSC_0_REGS, HW_PSC_AINTC, 0, PSC_MDCTL_NEXT_ENABLE);

    /* Initialize the vector table with opcodes */

    CopyVectorTable();

   /* Calling the main */

    main();

    while(1);

}

static void CopyVectorTable(void)

{

    unsigned int *dest = (unsigned int *)0xFFFF0000;

    unsigned int *src =  (unsigned int *)vecTbl;

    unsigned int count;

    for(count = 0; count < sizeof(vecTbl)/sizeof(vecTbl[0]); count++)

    {

        dest[count] = src[count];

    }

}

void BootAbort(void)

{

    while (1);

}

/***************************** End Of File ***********************************/