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/**
* @file
*
* @ingroup mpc55xx
*
* @brief BSP startup code.
*/
/*
* Copyright (c) 2008-2013 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <mpc55xx/mpc55xx.h>
#include <mpc55xx/regs.h>
#include <mpc55xx/edma.h>
#include <mpc55xx/emios.h>
#include <string.h>
#include <rtems.h>
#include <rtems/config.h>
#include <rtems/counter.h>
#include <libcpu/powerpc-utility.h>
#include <bsp/vectors.h>
#include <bsp.h>
#include <bsp/bootcard.h>
#include <bsp/irq.h>
#include <bsp/irq-generic.h>
#include <bsp/linker-symbols.h>
#include <bsp/start.h>
#include <bsp/mpc55xx-config.h>
/* Symbols defined in linker command file */
LINKER_SYMBOL(mpc55xx_exc_vector_base);
unsigned int bsp_clock_speed = 0;
uint32_t bsp_clicks_per_usec = 0;
static void null_pointer_protection(void)
{
#ifdef MPC55XX_NULL_POINTER_PROTECTION
struct MMU_tag mmu = { .MAS0 = { .B = { .TLBSEL = 1, .ESEL = 1 } } };
PPC_SET_SPECIAL_PURPOSE_REGISTER(FSL_EIS_MAS0, mmu.MAS0.R);
__asm__ volatile ("tlbre");
mmu.MAS1.R = PPC_SPECIAL_PURPOSE_REGISTER(FSL_EIS_MAS1);
mmu.MAS1.B.VALID = 0;
PPC_SET_SPECIAL_PURPOSE_REGISTER(FSL_EIS_MAS1, mmu.MAS1.R);
__asm__ volatile ("tlbwe");
#endif
}
uint32_t _CPU_Counter_frequency(void)
{
return bsp_clock_speed;
}
void bsp_start(void)
{
null_pointer_protection();
/*
* Get CPU identification dynamically. Note that the get_ppc_cpu_type()
* function store the result in global variables so that it can be used
* latter...
*/
get_ppc_cpu_type();
get_ppc_cpu_revision();
/*
* determine clock speed
*/
bsp_clock_speed = mpc55xx_get_system_clock() / MPC55XX_SYSTEM_CLOCK_DIVIDER;
/* Time reference value */
bsp_clicks_per_usec = bsp_clock_speed / 1000000;
ppc_exc_initialize_with_vector_base(
(uintptr_t) _ISR_Stack_area_begin,
mpc55xx_exc_vector_base
);
bsp_interrupt_initialize();
#if MPC55XX_CHIP_FAMILY != 566
mpc55xx_edma_init();
#endif
#ifdef MPC55XX_EMIOS_PRESCALER
mpc55xx_emios_initialize(MPC55XX_EMIOS_PRESCALER);
#endif
}
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