forked from Imagelibrary/rtems
105 lines
2.2 KiB
C
105 lines
2.2 KiB
C
/**
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* @file
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*
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* @ingroup RTEMSBSPsPowerPCMPC55XX
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*
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* @brief BSP startup code.
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*/
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/*
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* Copyright (c) 2008-2013 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Dornierstr. 4
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#include <mpc55xx/mpc55xx.h>
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#include <mpc55xx/regs.h>
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#include <mpc55xx/edma.h>
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#include <mpc55xx/emios.h>
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#include <string.h>
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#include <rtems.h>
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#include <rtems/config.h>
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#include <rtems/counter.h>
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#include <libcpu/powerpc-utility.h>
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#include <bsp/vectors.h>
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#include <bsp.h>
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#include <bsp/bootcard.h>
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#include <bsp/irq.h>
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#include <bsp/irq-generic.h>
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#include <bsp/linker-symbols.h>
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#include <bsp/start.h>
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#include <bsp/mpc55xx-config.h>
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/* Symbols defined in linker command file */
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LINKER_SYMBOL(mpc55xx_exc_vector_base);
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unsigned int bsp_clock_speed = 0;
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uint32_t bsp_clicks_per_usec = 0;
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static void null_pointer_protection(void)
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{
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#ifdef MPC55XX_NULL_POINTER_PROTECTION
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struct MMU_tag mmu = { .MAS0 = { .B = { .TLBSEL = 1, .ESEL = 1 } } };
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PPC_SET_SPECIAL_PURPOSE_REGISTER(FSL_EIS_MAS0, mmu.MAS0.R);
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__asm__ volatile ("tlbre");
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mmu.MAS1.R = PPC_SPECIAL_PURPOSE_REGISTER(FSL_EIS_MAS1);
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mmu.MAS1.B.VALID = 0;
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PPC_SET_SPECIAL_PURPOSE_REGISTER(FSL_EIS_MAS1, mmu.MAS1.R);
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__asm__ volatile ("tlbwe");
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#endif
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}
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uint32_t _CPU_Counter_frequency(void)
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{
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return bsp_clock_speed;
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}
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void bsp_start(void)
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{
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null_pointer_protection();
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/*
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* Get CPU identification dynamically. Note that the get_ppc_cpu_type()
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* function store the result in global variables so that it can be used
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* latter...
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*/
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get_ppc_cpu_type();
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get_ppc_cpu_revision();
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/*
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* determine clock speed
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*/
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bsp_clock_speed = mpc55xx_get_system_clock() / MPC55XX_SYSTEM_CLOCK_DIVIDER;
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/* Time reference value */
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bsp_clicks_per_usec = bsp_clock_speed / 1000000;
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ppc_exc_initialize_with_vector_base(
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(uintptr_t) _ISR_Stack_area_begin,
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mpc55xx_exc_vector_base
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);
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bsp_interrupt_initialize();
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#if MPC55XX_CHIP_FAMILY != 566
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mpc55xx_edma_init();
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#endif
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#ifdef MPC55XX_EMIOS_PRESCALER
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mpc55xx_emios_initialize(MPC55XX_EMIOS_PRESCALER);
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#endif
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}
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