195 lines
8.1 KiB
C
195 lines
8.1 KiB
C
/* ----------------------------------------------------------------------------
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* ATMEL Microcontroller Software Support
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* ----------------------------------------------------------------------------
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* Copyright (c) 2008, Atmel Corporation
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the disclaimer below.
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*
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* Atmel's name may not be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* ----------------------------------------------------------------------------
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*/
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//------------------------------------------------------------------------------
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// Headers
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//------------------------------------------------------------------------------
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#include "board.h"
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#include "board_memories.h"
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#include <pio/pio.h>
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#include <pmc/pmc.h>
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//------------------------------------------------------------------------------
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// Internal definitions
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//------------------------------------------------------------------------------
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/*
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Constants: Clock and PLL settings
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BOARD_OSCOUNT - Startup time of main oscillator (in number of slow clock
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ticks).
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BOARD_USBDIV - USB PLL divisor value to obtain a 48MHz clock.
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BOARD_CKGR_PLL - PLL frequency range.
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BOARD_PLLCOUNT - PLL startup time (in number of slow clock ticks).
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BOARD_MUL - PLL MUL value.
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BOARD_DIV - PLL DIV value.
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BOARD_PRESCALER - Master clock prescaler value.
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*/
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#define BOARD_OSCOUNT (AT91C_CKGR_OSCOUNT & (64 << 8))
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#define BOARD_CKGR_PLLA (AT91C_CKGR_SRCA | AT91C_CKGR_OUTA_2)
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#define BOARD_PLLACOUNT (63 << 8) // maximum
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#define BOARD_MULA (AT91C_CKGR_MULA & (49 << 16))
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#define BOARD_DIVA (AT91C_CKGR_DIVA & 3)
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#define BOARD_USBDIV AT91C_CKGR_USBDIV_2
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#define BOARD_CKGR_PLLB AT91C_CKGR_OUTB_0
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#define BOARD_PLLBCOUNT BOARD_PLLACOUNT
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#define BOARD_MULB (175 << 16)
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#define BOARD_DIVB 15
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#define BOARD_PRESCALER AT91C_PMC_MDIV_2
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//------------------------------------------------------------------------------
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// Internal functions
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//------------------------------------------------------------------------------
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//------------------------------------------------------------------------------
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/// Default spurious interrupt handler. Infinite loop.
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//------------------------------------------------------------------------------
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void defaultSpuriousHandler( void )
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{
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//while (1);
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}
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//------------------------------------------------------------------------------
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/// Default handler for fast interrupt requests. Infinite loop.
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//------------------------------------------------------------------------------
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void defaultFiqHandler( void )
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{
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while (1);
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}
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//------------------------------------------------------------------------------
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/// Default handler for standard interrupt requests. Infinite loop.
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//------------------------------------------------------------------------------
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void defaultIrqHandler( void )
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{
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while (1);
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}
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//------------------------------------------------------------------------------
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// Exported functions
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//------------------------------------------------------------------------------
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//------------------------------------------------------------------------------
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/// Performs the low-level initialization of the chip. Initialisation depends
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/// on where the application is executed:
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/// - in sdram: it means that sdram has previously been initialized. No further
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/// initialization is required.
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/// - in sram: PLL shall be initialized in LowLevelInit. Other initializations
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/// can be done later by the application.
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/// - in norflash: LowLevelInit can't be executed in norflash because SMC
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/// settings can't be changed while executing in external flash.
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/// LowLevelInit shall be executed in internal sram. It initializes
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/// PLL and SMC.
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/// This function also reset the AIC and disable RTT and PIT interrupts
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//------------------------------------------------------------------------------
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void LowLevelInit( void )
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{
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unsigned char i;
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// If already running in external ram, PLL settings have already been done
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#if !defined(sdram) && !defined(ddram) && !defined(bcram)
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/* Initialize main oscillator
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****************************/
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AT91C_BASE_PMC->PMC_MOR = BOARD_OSCOUNT | AT91C_CKGR_MOSCEN;
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while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MOSCS));
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// Initialize PLLA at 200MHz
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AT91C_BASE_PMC->PMC_PLLAR = BOARD_CKGR_PLLA
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| BOARD_PLLACOUNT
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| BOARD_MULA
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| BOARD_DIVA;
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while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCKA));
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// Initialize PLLB for USB usage (if not already locked)
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if (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCKB)) {
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AT91C_BASE_PMC->PMC_PLLBR = BOARD_USBDIV
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| BOARD_CKGR_PLLB
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| BOARD_PLLBCOUNT
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| BOARD_MULB
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| BOARD_DIVB;
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while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCKB));
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}
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/* Switch to fast clock
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**********************/
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/* Wait for the master clock if it was already initialized */
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while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY));
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/* Switch to main oscillator + prescaler */
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AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_CSS_SLOW_CLK | AT91C_PMC_PRES_CLK | AT91C_PMC_MDIV_2;
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while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY));
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// Select PLLA
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AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_CSS_PLLA_CLK | AT91C_PMC_PRES_CLK | AT91C_PMC_MDIV_2;
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while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY));
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#endif //#if !defined(sdram) && !defined(ddram) && !defined(bcram)
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/* Initialize AIC
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****************/
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AT91C_BASE_AIC->AIC_IDCR = 0xFFFFFFFF;
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AT91C_BASE_AIC->AIC_SVR[0] = (unsigned int) defaultFiqHandler;
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for (i = 1; i < 31; i++) {
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AT91C_BASE_AIC->AIC_SVR[i] = (unsigned int) defaultIrqHandler;
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}
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AT91C_BASE_AIC->AIC_SPU = (unsigned int) defaultSpuriousHandler;
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// Unstack nested interrupts
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for (i = 0; i < 8 ; i++) {
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AT91C_BASE_AIC->AIC_EOICR = 0;
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}
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/* Watchdog initialization
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*************************/
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AT91C_BASE_WDTC->WDTC_WDMR = AT91C_WDTC_WDDIS;
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/* Remap
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*******/
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BOARD_RemapRam();
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/* User reset is deleted (workaround Issue 5387) */
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AT91C_BASE_RSTC->RSTC_RMR = 0xA5000000;
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// Disable RTT and PIT interrupts (potential problem when program A
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// configures RTT, then program B wants to use PIT only, interrupts
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// from the RTT will still occur since they both use AT91C_ID_SYS)
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AT91C_BASE_RTTC->RTTC_RTMR &= ~(AT91C_RTTC_ALMIEN | AT91C_RTTC_RTTINCIEN);
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AT91C_BASE_PITC->PITC_PIMR &= ~AT91C_PITC_PITIEN;
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#if defined(norflash)
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BOARD_ConfigureNorFlash(BOARD_NORFLASH_DFT_BUS_SIZE);
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#endif
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}
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