init.c

(1)个人针对atmel提供的运行于CPU内13k空间的ram的romboot修改而成。 (2)提供了IRQ和FIQ的测试工作； (3)提供了对外部sdram的数据总线和地址总线的测试工作 (3

//*----------------------------------------------------------------------------
//*         ATMEL Microcontroller Software Support  -  ROUSSET  -
//*----------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*----------------------------------------------------------------------------
//* File Name           : init.c
//* Object              : Low level initialisations written in C
//* Creation            : HIi   10/10/2003
//*
//*----------------------------------------------------------------------------

#include <AT91RM9200.h>
#include <lib_AT91RM9200.h>

//*----------------------------------------------------------------------------
//* \fn    AT91F_DBGU_Printk
//* \brief This function is used to send a string through the DBGU channel (Very low level debugging)
//*----------------------------------------------------------------------------
void AT91F_DBGU_Printk(
	char *buffer) // \arg pointer to a string ending by \0
{
	while(*buffer != '\0') {
		while (!AT91F_US_TxReady((AT91PS_USART)AT91C_BASE_DBGU));
		AT91F_US_PutChar((AT91PS_USART)AT91C_BASE_DBGU, *buffer++);
	}
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_DataAbort
//* \brief This function reports an Abort
//*----------------------------------------------------------------------------
void AT91F_SpuriousHandler() 
{
	AT91F_DBGU_Printk("-F- Spurious Interrupt detected\n\r");
	while (1);
}


//*----------------------------------------------------------------------------
//* \fn    AT91F_DataAbort
//* \brief This function reports an Abort
//*----------------------------------------------------------------------------
void AT91F_DataAbort() 
{
	AT91F_DBGU_Printk("-F- Data Abort detected\n\r");
	while (1);
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_FetchAbort
//* \brief This function reports an Abort
//*----------------------------------------------------------------------------
void AT91F_FetchAbort()
{
	AT91F_DBGU_Printk("-F- Prefetch Abort detected\n\r");
	while (1);
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_Undef
//* \brief This function reports an Abort
//*----------------------------------------------------------------------------
void AT91F_Undef() 
{
	AT91F_DBGU_Printk("-F- Undef detected\n\r");
	while (1);
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_UndefHandler
//* \brief This function reports that no handler have been set for current IT
//*----------------------------------------------------------------------------
void AT91F_UndefHandler() 
{
	AT91F_DBGU_Printk("-F- Undef detected\n\r");
	while (1);
}

//*--------------------------------------------------------------------------------------
//* Function Name       : AT91F_InitSdram
//* Object              : Initialize the SDRAM
//* Input Parameters    :
//* Output Parameters   :
//*--------------------------------------------------------------------------------------
void AT91F_InitSdram()
{
	int *pRegister;
	
	//* Configure PIOC as peripheral (D16/D31)
	
	AT91F_PIO_CfgPeriph(
						 AT91C_BASE_PIOC, // PIO controller base address
						 0xFFFF0130,
						 0
						);
	
	//*Init SDRAM
	pRegister = (int *)0xFFFFFF98;
	*pRegister = 0x2188c155; 
	pRegister = (int *)0xFFFFFF90;
	*pRegister = 0x2; 
	pRegister = (int *)0x20000000;
	*pRegister = 0; 
	pRegister = (int *)0xFFFFFF90;
	*pRegister = 0x4; 
	pRegister = (int *)0x20000000;
	*pRegister = 0; 
	*pRegister = 0; 
	*pRegister = 0; 
	*pRegister = 0; 
	*pRegister = 0; 
	*pRegister = 0; 
	*pRegister = 0; 
	*pRegister = 0; 
	pRegister = (int *)0xFFFFFF90;
	*pRegister = 0x3; 
	pRegister = (int *)0x20000080;
	*pRegister = 0; 
	pRegister = (int *)0xFFFFFF94;
	*pRegister = 0x2e0; 
	pRegister = (int *)0x20000000;
	*pRegister = 0; 
	pRegister = (int *)0xFFFFFF90;
	*pRegister = 0x00; 
	pRegister = (int *)0x20000000;
	*pRegister = 0; 

}

//*--------------------------------------------------------------------------------------
//* Function Name       : AT91F_InitNandFlash
//* Object              : Initialize the NandFlash
//* Input Parameters    :
//* Output Parameters   :
//*--------------------------------------------------------------------------------------
/*define nand flash circuit PIOC0--PIOC3 use satuation*/
#define PC0        (1<<0)         /*use as pio*/
#define PC1        (0<<1)		/*use interface A*/
#define PC2        (1<<2)            /*use as pio*/
#define PC3        (0<<3)		/*use interface A*/
#define SMOE      (1<<1)		/*PC1 use as interface A --SMOE*/
#define SMWE     (1<<3)		/*PC3 use as interface A--SMWE*/

 //*----------------------------------------------------------------------------
//* \fn    AT91F_InitFlash
//* \brief This function performs low level HW initialization
//*----------------------------------------------------------------------------

void AT91F_InitMemories()
{
	int *pEbi = (int *)0xFFFFFF60;

//* Setup MEMC to support all connected memories (CS0 = FLASH; CS1=SDRAM; CS3=NAND FLASH)
	pEbi  = (int *)0xFFFFFF60;
	*pEbi = 0x0000000A;

//* CS0 cs for flash
	pEbi  = (int *)0xFFFFFF70;
	*pEbi = 0x00003284;
	
	AT91F_InitSdram();
       
}



//*----------------------------------------------------------------------------
//* \fn    AT91F_LowLevelInit
//* \brief This function performs very low level HW initialization
//*----------------------------------------------------------------------------

void AT91F_LowLevelInit(void)
{
	//AT91_REG count=1000000;
	// Init Interrupt Controller
	AT91F_AIC_Open(
		AT91C_BASE_AIC,          // pointer to the AIC registers
		AT91C_AIC_BRANCH_OPCODE, // IRQ exception vector
		AT91C_AIC_BRANCH_OPCODE,      // FIQ exception vector
		AT91F_UndefHandler,      // AIC default handler
		AT91F_SpuriousHandler,   // AIC spurious handler
		0);                      // Protect mode

	// Perform 8 End Of Interrupt Command to make s齬e AIC will not Lock out nIRQ 
	AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC);
	AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC);
	AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC);
	AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC);
	AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC);
	AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC);
	AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC);
	AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC);

	AT91F_AIC_SetExceptionVector((unsigned int *)0x0C, AT91F_FetchAbort);
	AT91F_AIC_SetExceptionVector((unsigned int *)0x10, AT91F_DataAbort);
	AT91F_AIC_SetExceptionVector((unsigned int *)0x4, AT91F_Undef);

	//Initialize SDRAM and Flash
	AT91F_InitMemories();
	
	// Open PIO for DBGU
	AT91F_DBGU_CfgPIO();

	// Configure DBGU
	AT91F_US_Configure (
		(AT91PS_USART) AT91C_BASE_DBGU,          // DBGU base address
		48000000,             // 48 MHz
		AT91C_US_ASYNC_MODE,        // mode Register to be programmed
		115200,              // baudrate to be programmed
		0);                   // timeguard to be programmed

	// Enable Transmitter
	AT91F_US_EnableTx((AT91PS_USART)AT91C_BASE_DBGU);
	// Enable Receiver
	AT91F_US_EnableRx((AT91PS_USART)AT91C_BASE_DBGU);
	
	#if 0
	#if 1	
	AT91F_DBGU_Printk("Starting Romboot...");
	#else
	AT91F_DBGU_Printk("\n\r-I- AT91F_LowLevelInit(): Debug channel initialized\n\r");	
	#endif
	#endif
}