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/****************************************************************************
* arch/hc/src/mc9s12ne64/mc9s12ne64_start.S
* arch/hc/src/chip/mc9s12ne64_start.S
*
* Copyright (C) 2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include "mc9s12ne64_mmc.h"
#include "mc9s12ne64_crg.h"
/****************************************************************************
* Private Definitions
****************************************************************************/
/************************************************************************************
* Global Symbols
************************************************************************************/
.globl __start
.file "mc9s12ne64_start.S"
/****************************************************************************
* Macros
****************************************************************************/
/* Memory map initialization */
.macro MMCINIT
movb #0, HC12_MMC_INITRG /* Set the register map position */
nop
movb #32, HC12_MMC_INITRM /* Set the RAM map position */
movb #1, HC12_MMC_MISC /* MISC: EXSTR1=0 EXSTR0=0 ROMHM=0 ROMON=1 */
.endm
/* System clock initialization */
.macro PLLINIT
/* Select the clock source from crystal */
movb #0, HC12_CRG_CLKSEL
movb #CRG_CRGSEL_PLLSEL, HC12_CRG_CLKSEL
/* Set the multipler and divider and enable the PLL */
movb #0, HC12_CRG_PLLCTL
movb #15, HC12_CRG_SYNR
movb #15, HC12_CRG_REFDV
movb #(CRG_PLLCTL_CME|CRG_PLLCTL_PLLON), HC12_CRG_PLLCTL
/* Wait for the PLL to lock on */
.Lpll_lock:
ldab HC12_CRG_CRGFLG
clra
andb #CRG_CRGFLG_LOCK
ldx #0
bne .Lpll_lock
tbne d,.Lpll_lock
/* The select the PLL clock source */
bset HC12_CRG_CLKSEL_OFFSET, #CRG_CLKSEL_PLLSEL
.endm
/****************************************************************************
* .text
****************************************************************************/
/****************************************************************************
* Name: __start
*
* Description:
* Power-up reset entry point
*
****************************************************************************/
__start:
MMCINIT /* Initialize the MMC */
PLLINIT /* Initialize the PLL */
.end
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