AT91RM9200-Boot.rar_at91rm9200_at91rm9200 boot_boot_boot程序

/*---------------------------------------------------------------------------- */ /* 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 : FB 23/10/2002 */ /* */ /*----------------------------------------------------------------------------*/ #include "AT91RM9200.h" /* ////////////////////////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////////////////////////// */ #define FALSE 0 #define TRUE 1 #define DELAY_PLL 100 #define DELAY_MAIN_FREQ 100 #define INPUT_FREQ_MIN 900000 #define INPUT_FREQ_MAX 32000000 #define MASTER_CLOCK 59904000 // #define MASTER_CLOCK 45000000 #define QUARTZ_18432 1 #if QUARTZ_18432 #define PLLAR 0x20263E04 /* 180 MHz for PLLA */ #define PLLBR 0x10483E0E /* 48,054857 MHz (divider by 2 for USB) */ #else /* 4.608MHZ */ #define PLLAR 0x20263E01 /* 179,712000 MHz for PCK for 4.608 */ #define PLLBR 0x10673E05 /* 48,054857 MHz (divider by 2 for USB) */ #endif #define MCKR 0x0000202 /* PLLA=180 , == CPU = 180MHZ, MASTER_CLOCK = 60MHZ */ //#define MCKR 0x0000302 /* PLLA=180 , == CPU = 180MHZ, MASTER_CLOCK = 45MHZ */ #define BASE_EBI_CS0_ADDRESS 0x10000000 /* base address to access memory on CS0 */ #define BASE_EBI_CS1_ADDRESS 0x20000000 /* base address to access memory on CS1 */ #define OUTPUT_FREQ_MIN 80000000 #define OUTPUT_FREQ_MAX 240000000 #define C1_IDC (1<<2) /* icache and/or dcache off/on */ /* ////////////////////////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////////////////////////*/ /*---------------------------------------------------------------------------- */ /* \fn AT91F_WaitForMainClockFrequency */ /* \brief This function performs very low level HW initialization */ /*----------------------------------------------------------------------------*/ unsigned char AT91F_WaitForMainClockFrequency() { volatile char tmp = 0; /*---------------------------------------------------------------------------- */ /* Step 2. */ /* Checking the Main Oscillator Frequency (Optional) */ /*---------------------------------------------------------------------------- */ /* Determine the main clock frequency */ while(!(AT91C_BASE_CKGR->CKGR_MCFR & AT91C_CKGR_MAINRDY) && (tmp++ < DELAY_MAIN_FREQ)); if (tmp >= DELAY_MAIN_FREQ) return FALSE; return TRUE; } /*----------------------------------------------------------------------------*/ /* \fn AT91F_CheckPLL_FrequencyRange */ /* \brief This function performs very low level HW initialiszation */ /*----------------------------------------------------------------------------*/ unsigned char AT91F_CheckPLL_FrequencyRange(unsigned int MainClock,unsigned int pllDivider , unsigned int pllMultiplier) { if(pllDivider == 0) return FALSE; /* Check Input Frequency */ if( ((MainClock/pllDivider) < INPUT_FREQ_MIN) || ((MainClock/pllDivider) > INPUT_FREQ_MAX) ) return FALSE; /* Check Output Frequency */ if( ((MainClock/pllDivider*pllMultiplier) < OUTPUT_FREQ_MIN) || ((MainClock/pllDivider*pllMultiplier) > OUTPUT_FREQ_MAX) ) return FALSE; return TRUE; } /*----------------------------------------------------------------------------*/ /* \fn AT91F_InitClocks */ /* \brief This function performs very low level HW initialization */ /*----------------------------------------------------------------------------*/ unsigned char AT91F_InitClocks(int PLLAR_Register,int PLLBR_Register ,int MCKR_Register) { volatile char tmp = 0; unsigned int MainClock; unsigned int pllDivider,pllMultiplier; /*---------------------------------------------------------------------------- */ /* Optionnal */ /*---------------------------------------------------------------------------- */ /* Check if Input & Output Frequencies are in the correct range */ /* Get Main Clock */ MainClock = (((AT91C_BASE_CKGR->CKGR_MCFR) & AT91C_CKGR_MAINF) * 32768) >> 4; pllDivider = (PLLAR_Register & AT91C_CKGR_DIVA); pllMultiplier = ((PLLAR_Register & AT91C_CKGR_MULA) >> 16) + 1; if(AT91F_CheckPLL_FrequencyRange(MainClock, pllDivider , pllMultiplier) == FALSE) return FALSE; pllDivider = (PLLBR_Register & AT91C_CKGR_DIVB); pllMultiplier = ((PLLBR_Register & AT91C_CKGR_MULB) >> 16) + 1; if(AT91F_CheckPLL_FrequencyRange(MainClock, pllDivider , pllMultiplier) == FALSE) return FALSE; /*---------------------------------------------------------------------------- */ /* Step 3. */ /* Setting PLLA and Divider A */ /*---------------------------------------------------------------------------- */ AT91C_BASE_CKGR->CKGR_PLLAR = PLLAR_Register; /* Wait for PLLA stabilization LOCKA bit in PMC_SR */ tmp = 0; while( !(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCKA) && (tmp++ < DELAY_PLL) ) ; /*---------------------------------------------------------------------------- */ /* Step 4. */ /* Setting PLLB and Divider B */ /*---------------------------------------------------------------------------- */ AT91C_BASE_CKGR->CKGR_PLLBR = PLLBR_Register; /* Wait for PLLB stabilization LOCKB bit in PMC_SR */ tmp = 0; while( !(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCKB) && (tmp++ < DELAY_PLL) ) ; /*---------------------------------------------------------------------------- */ /* Step 5. */ /* Selection of Master Clock MCK (and Processor Clock PCK) */ /*---------------------------------------------------------------------------- */ /* Constraints of the Master Clock selection sequence */ /* Write in the MCKR dirty value concerning the clock selection CSS then overwrite it in a second sequence */ AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_CSS_SLOW_CLK; /* Wait until the master clock is established */ tmp = 0; while( !(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY) && (tmp++ < DELAY_MAIN_FREQ) ); /* Second sequence */ AT91C_BASE_PMC->PMC_MCKR = MCKR_Register; /* Wait until the master clock is established */ tmp = 0; while( !(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY) && (tmp++ < DELAY_MAIN_FREQ) ); return TRUE; } void AT91F_InitSDRAM() { volatile int *pRegister; AT91PS_PIO pPio = AT91C_BASE_PIOC; /* Configure PIOC as peripheral (D16/D31) */ pPio->PIO_ASR = 0xFFFF0000; pPio->PIO_BSR = 0x0; pPio->PIO_PDR = 0xFFFF0000; /* Setup MEMC to support all connected memories (CS0 = FLASH; CS1=SDRAM) */ pRegister = (int *)0xFFFFFF60; *pRegister = 0x02; /* 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 *)0xFFFFFF9