forked from Imagelibrary/rtems
a762dc2a49
Rework of the start sequence to reduce the amount assembler code and to support configuration tables which may be provided by the application.
165 lines
3.5 KiB
C
165 lines
3.5 KiB
C
/**
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* @file
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*
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* @ingroup mpc55xx
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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) 2008-2011 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Obere Lagerstr. 30
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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.com/license/LICENSE.
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*
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* $Id$
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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 <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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extern Heap_Control *RTEMS_Malloc_Heap;
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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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void BSP_panic( char *s)
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{
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rtems_interrupt_level level;
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rtems_interrupt_disable( level);
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printk( "%s PANIC %s\n", _RTEMS_version, s);
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while (1) {
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/* Do nothing */
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}
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}
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void _BSP_Fatal_error( unsigned n)
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{
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rtems_interrupt_level level;
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rtems_interrupt_disable( level);
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printk( "%s PANIC ERROR %u\n", _RTEMS_version, n);
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while (1) {
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/* Do nothing */
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}
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}
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static void null_pointer_protection(void)
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{
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#if defined(MPC55XX_BOARD_MPC5674FEVB) || defined(MPC55XX_BOARD_MPC5566EVB)
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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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void bsp_start(void)
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{
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rtems_status_code sc = RTEMS_SUCCESSFUL;
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ppc_cpu_id_t myCpu;
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ppc_cpu_revision_t myCpuRevision;
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#if defined(MPC55XX_BOARD_MPC5674FEVB)
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unsigned system_clock_divider = 2;
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#else
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unsigned system_clock_divider = 1;
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#endif
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null_pointer_protection();
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/*
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* make sure BSS/SBSS is cleared
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*/
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memset(&bsp_section_bss_begin [0], 0, (size_t) bsp_section_bss_size);
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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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myCpu = get_ppc_cpu_type();
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myCpuRevision = 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() / 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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/* Initialize exceptions */
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ppc_exc_vector_base = (uint32_t) mpc55xx_exc_vector_base;
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sc = ppc_exc_initialize(
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PPC_INTERRUPT_DISABLE_MASK_DEFAULT,
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(uintptr_t) bsp_section_work_begin,
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Configuration.interrupt_stack_size
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);
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if (sc != RTEMS_SUCCESSFUL) {
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BSP_panic( "Cannot initialize exceptions");
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}
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ppc_exc_set_handler(ASM_ALIGN_VECTOR, ppc_exc_alignment_handler);
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/* Initialize interrupts */
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sc = bsp_interrupt_initialize();
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if (sc != RTEMS_SUCCESSFUL) {
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BSP_panic( "Cannot initialize interrupts");
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}
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mpc55xx_edma_init();
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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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void bsp_pretasking_hook(void)
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{
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#if MPC55XX_CHIP_TYPE / 10 == 564
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_Heap_Extend(
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RTEMS_Malloc_Heap,
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bsp_section_rwextra_end,
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(uintptr_t) bsp_ram_end
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- (uintptr_t) bsp_section_rwextra_end,
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NULL
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);
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#endif
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}
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