From 044ad7c3987460ede48ff27afd6bdb0ca05a0432 Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Mon, 4 Jul 2011 20:52:54 +0200 Subject: import at91lib from at91lib_20100901_softpack_1_9_v_1_0_svn_v15011 it's sad to see that atmel doesn't publish their svn repo or has a centralized location or even puts proper version/release info into the library itself --- boards/at91sam9m11-ek/board_lowlevel.c | 174 +++++++++++++++++++++++++++++++++ 1 file changed, 174 insertions(+) create mode 100644 boards/at91sam9m11-ek/board_lowlevel.c (limited to 'boards/at91sam9m11-ek/board_lowlevel.c') diff --git a/boards/at91sam9m11-ek/board_lowlevel.c b/boards/at91sam9m11-ek/board_lowlevel.c new file mode 100644 index 0000000..00bdb11 --- /dev/null +++ b/boards/at91sam9m11-ek/board_lowlevel.c @@ -0,0 +1,174 @@ +/* ---------------------------------------------------------------------------- + * ATMEL Microcontroller Software Support + * ---------------------------------------------------------------------------- + * Copyright (c) 2008, Atmel Corporation + * + * All rights reserved. + * + * 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 disclaimer below. + * + * Atmel's name may not be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE + * DISCLAIMED. IN NO EVENT SHALL ATMEL 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 ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, + * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * ---------------------------------------------------------------------------- + */ + +//------------------------------------------------------------------------------ +/// \unit +/// +/// !Purpose +/// +/// Provides the low-level initialization function that gets called on chip +/// startup. +/// +/// !Usage +/// +/// LowLevelInit() is called in #board_cstartup.S#. +//------------------------------------------------------------------------------ + +//------------------------------------------------------------------------------ +// Headers +//------------------------------------------------------------------------------ + +#include "board.h" +#include "board_memories.h" +#include + +//------------------------------------------------------------------------------ +// Internal definitions +//------------------------------------------------------------------------------ + +/* Settings at 400/133MHz */ +#define BOARD_OSCOUNT (AT91C_CKGR_OSCOUNT & (64 << 8)) +#define BOARD_CKGR_PLLA (AT91C_CKGR_SRCA | AT91C_CKGR_OUTA_0) +#define BOARD_PLLACOUNT (0x3F << 8) +#define BOARD_MULA (AT91C_CKGR_MULA & (199 << 16)) +#define BOARD_DIVA (AT91C_CKGR_DIVA & 3) +#define BOARD_PRESCALER (0x00001300) //400/133MHz +//#define BOARD_PRESCALER (0x00001200) //400/100MHz + +//------------------------------------------------------------------------------ +// Internal functions +//------------------------------------------------------------------------------ +//------------------------------------------------------------------------------ +/// Default spurious interrupt handler. Infinite loop. +//------------------------------------------------------------------------------ +void defaultSpuriousHandler( void ) +{ + while (1); +} + +//------------------------------------------------------------------------------ +/// Default handler for fast interrupt requests. Infinite loop. +//------------------------------------------------------------------------------ +void defaultFiqHandler( void ) +{ + while (1); +} + +//------------------------------------------------------------------------------ +/// Default handler for standard interrupt requests. Infinite loop. +//------------------------------------------------------------------------------ +void defaultIrqHandler( void ) +{ + while (1); +} + +//------------------------------------------------------------------------------ +// Exported functions +//------------------------------------------------------------------------------ +//------------------------------------------------------------------------------ +/// Performs the low-level initialization of the chip. Initialisation depends +/// on where the application is executed: +/// - in sdram: it means that sdram has previously been initialized. No further +/// initialization is required. +/// - in sram: PLL shall be initialized in LowLevelInit. Other initializations +/// can be done later by the application. +/// - in norflash: LowLevelInit can't be executed in norflash because SMC +/// settings can't be changed while executing in external flash. +/// LowLevelInit shall be executed in internal sram. It initializes +/// PLL and SMC. +/// This function also reset the AIC and disable RTT and PIT interrupts +//------------------------------------------------------------------------------ +void LowLevelInit(void) +{ + unsigned char i; + +#if !defined(ddram) + /* Initialize main oscillator + ****************************/ + AT91C_BASE_PMC->PMC_MOR = BOARD_OSCOUNT | AT91C_CKGR_MOSCEN; + while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MOSCS)); + + /* Initialize PLLA */ + AT91C_BASE_PMC->PMC_PLLAR = BOARD_CKGR_PLLA + | BOARD_PLLACOUNT + | BOARD_MULA + | BOARD_DIVA; + while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCKA)); + + + /* Wait for the master clock if it was already initialized */ + while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY)); + + /* Switch to fast clock + **********************/ + /* Switch to main oscillator + prescaler */ + AT91C_BASE_PMC->PMC_MCKR = BOARD_PRESCALER; + while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY)); + + /* Switch to PLL + prescaler */ + AT91C_BASE_PMC->PMC_MCKR |= AT91C_PMC_CSS_PLLA_CLK; + while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY)); +#endif + + /* Initialize AIC + ****************/ + AT91C_BASE_AIC->AIC_IDCR = 0xFFFFFFFF; + AT91C_BASE_AIC->AIC_SVR[0] = (unsigned int) defaultFiqHandler; + for (i = 1; i < 31; i++) { + + AT91C_BASE_AIC->AIC_SVR[i] = (unsigned int) defaultIrqHandler; + } + AT91C_BASE_AIC->AIC_SPU = (unsigned int) defaultSpuriousHandler; + + // Unstack nested interrupts + for (i = 0; i < 8 ; i++) { + + AT91C_BASE_AIC->AIC_EOICR = 0; + } + + + /* Watchdog initialization + *************************/ + AT91C_BASE_WDTC->WDTC_WDMR = AT91C_WDTC_WDDIS; + + /* Remap + *******/ + BOARD_RemapRam(); + + // Disable RTT and PIT interrupts (potential problem when program A + // configures RTT, then program B wants to use PIT only, interrupts + // from the RTT will still occur since they both use AT91C_ID_SYS) + AT91C_BASE_RTTC->RTTC_RTMR &= ~(AT91C_RTTC_ALMIEN | AT91C_RTTC_RTTINCIEN); + AT91C_BASE_PITC->PITC_PIMR &= ~AT91C_PITC_PITIEN; + +#if defined(norflash) + BOARD_ConfigureNorFlash(BOARD_NORFLASH_DFT_BUS_SIZE); +#endif +} + -- cgit v1.2.3