215 lines
6.5 KiB
C
215 lines
6.5 KiB
C
/****************************************************************************
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* arch/mips/src/pic32/pic32mx-lowinit.c
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*
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* Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <assert.h>
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#include <arch/pic32mx/cp0.h>
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#include "up_internal.h"
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#include "up_arch.h"
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#include "chip.h"
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#include "pic32mx-internal.h"
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#include "pic32mx-bmx.h"
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#include "pic32mx-che.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Maximum Frequencies ******************************************************/
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#define MAX_FLASH_HZ 30000000 /* Maximum FLASH speed (Hz) */
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#define MAX_PBCLOCK 80000000 /* Max peripheral bus speed (Hz) */
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/* Sanity checks ************************************************************/
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/* Make sure that the selected clock parameters are sane */
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#define CALC_SYSCLOCK (((BOARD_PLL_INPUT / BOARD_PLL_IDIV) * BOARD_PLL_MULT) / BOARD_PLL_ODIV)
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#if CALC_SYSCLOCK != BOARD_CPU_CLOCK
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# error "Bad BOARD_CPU_CLOCK calculcation in board.h"
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#endif
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#define CALC_PBCLOCK (CALC_SYSCLOCK / BOARD_PBDIV)
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#if CALC_PBCLOCK != BOARD_PBCLOCK
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# error "Bad BOARD_PBCLOCK calculcation in board.h"
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#endif
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#if CALC_PBCLOCK > MAX_PBCLOCK
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# error "PBCLOCK exceeds maximum value"
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#endif
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Global Variables
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****************************************************************************/
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pic32mx_waitstates
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*
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* Description:
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* Configure the optimal number of FLASH wait states.
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*
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* Assumptions:
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* Interrupts are disabled.
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*
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****************************************************************************/
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static inline void pic32mx_waitstates(void)
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{
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#ifdef CHIP_CHE
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unsigned int nwaits;
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unsigned int residual;
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#endif
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/* Disable DRM wait states */
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putreg32(BMX_CON_BMXWSDRM, PIC32MX_BMX_CONCLR);
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#ifdef CHIP_CHE
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/* Configure pre-fetch cache FLASH wait states */
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residual = BOARD_CPU_CLOCK;
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nwaits = 0;
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while(residual > MAX_FLASH_HZ)
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{
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nwaits++;
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residual -= MAX_FLASH_HZ;
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}
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DEBUGASSERT(nwaits < 8);
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/* Set the FLASH wait states -- clearing all other bits! */
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putreg32(nwaits, PIC32MX_CHE_CON);
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#endif
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}
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/****************************************************************************
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* Name: pic32mx_cache
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*
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* Description:
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* Enable caching.
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*
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* Assumptions:
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* Interrupts are disabled.
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*
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****************************************************************************/
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static inline void pic32mx_cache(void)
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{
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register uint32_t regval;
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/* Enable prefetch on all regions */
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#ifdef CHIP_CHE
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regval = getreg32(PIC32MX_CHE_CON);
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regval |= CHE_CON_PREFEN_ALL;
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putreg32(regval, PIC32MX_CHE_CON);
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#endif
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/* Enable cache on KSEG 0 in the CP0 CONFIG register*/
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asm("\tmfc0 %0,$16,0\n" : "=r"(regval));
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regval &= ~CP0_CONFIG_K23_MASK;
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regval |= CP0_CONFIG_K23_CACHEABLE;
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asm("\tmtc0 %0,$16,0\n" : : "r" (regval));
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pic32mx_lowinit
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*
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* Description:
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* This performs basic low-level initialization of the system.
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*
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* Assumptions:
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* Interrupts have not yet been enabled.
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*
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****************************************************************************/
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void pic32mx_lowinit(void)
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{
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/* Initialize FLASH wait states */
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pic32mx_waitstates();
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/* Enable caching */
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pic32mx_cache();;
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/* Initialize a console (probably a serial console) */
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pic32mx_consoleinit();
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/* Perform early serial initialization (so that we will have debug output
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* available as soon as possible).
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*/
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#ifdef USE_EARLYSERIALINIT
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up_earlyserialinit();
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#endif
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/* Perform board-level initialization */
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pic32mx_boardinitialize();
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}
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