[574fb67] | 1 | /** |
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| 2 | * @file |
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| 3 | * |
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| 4 | * @ingroup mpc55xx |
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| 5 | * |
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| 6 | * @brief BSP startup code. |
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| 7 | */ |
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| 8 | |
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| 9 | /* |
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[9e7758b] | 10 | * Copyright (c) 2008-2011 embedded brains GmbH. All rights reserved. |
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[574fb67] | 11 | * |
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[9e7758b] | 12 | * embedded brains GmbH |
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| 13 | * Obere Lagerstr. 30 |
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| 14 | * 82178 Puchheim |
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| 15 | * Germany |
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| 16 | * <rtems@embedded-brains.de> |
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| 17 | * |
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| 18 | * The license and distribution terms for this file may be |
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| 19 | * found in the file LICENSE in this distribution or at |
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| 20 | * http://www.rtems.com/license/LICENSE. |
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[574fb67] | 21 | */ |
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| 22 | |
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| 23 | #include <mpc55xx/mpc55xx.h> |
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| 24 | #include <mpc55xx/regs.h> |
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| 25 | #include <mpc55xx/edma.h> |
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[2f5435a4] | 26 | #include <mpc55xx/emios.h> |
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[9e7758b] | 27 | |
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| 28 | #include <string.h> |
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[574fb67] | 29 | |
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| 30 | #include <rtems.h> |
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[9e7758b] | 31 | #include <rtems/config.h> |
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[574fb67] | 32 | |
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| 33 | #include <libcpu/powerpc-utility.h> |
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[2d2de4eb] | 34 | #include <bsp/vectors.h> |
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[574fb67] | 35 | |
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| 36 | #include <bsp.h> |
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[d4886a06] | 37 | #include <bsp/bootcard.h> |
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[574fb67] | 38 | #include <bsp/irq.h> |
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| 39 | #include <bsp/irq-generic.h> |
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[9e7758b] | 40 | #include <bsp/linker-symbols.h> |
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| 41 | #include <bsp/start.h> |
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| 42 | #include <bsp/mpc55xx-config.h> |
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[574fb67] | 43 | |
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| 44 | /* Symbols defined in linker command file */ |
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[9e7758b] | 45 | LINKER_SYMBOL(mpc55xx_exc_vector_base); |
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[574fb67] | 46 | |
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| 47 | unsigned int bsp_clock_speed = 0; |
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| 48 | |
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| 49 | uint32_t bsp_clicks_per_usec = 0; |
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| 50 | |
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| 51 | void BSP_panic( char *s) |
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| 52 | { |
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| 53 | rtems_interrupt_level level; |
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| 54 | |
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| 55 | rtems_interrupt_disable( level); |
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| 56 | |
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| 57 | printk( "%s PANIC %s\n", _RTEMS_version, s); |
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| 58 | |
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| 59 | while (1) { |
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| 60 | /* Do nothing */ |
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| 61 | } |
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| 62 | } |
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| 63 | |
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| 64 | void _BSP_Fatal_error( unsigned n) |
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| 65 | { |
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| 66 | rtems_interrupt_level level; |
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| 67 | |
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| 68 | rtems_interrupt_disable( level); |
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| 69 | |
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| 70 | printk( "%s PANIC ERROR %u\n", _RTEMS_version, n); |
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| 71 | |
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| 72 | while (1) { |
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| 73 | /* Do nothing */ |
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| 74 | } |
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| 75 | } |
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| 76 | |
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[9e7758b] | 77 | static void null_pointer_protection(void) |
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[574fb67] | 78 | { |
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[b9b3f3b7] | 79 | #ifdef MPC55XX_NULL_POINTER_PROTECTION |
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[9e7758b] | 80 | struct MMU_tag mmu = { .MAS0 = { .B = { .TLBSEL = 1, .ESEL = 1 } } }; |
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| 81 | |
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| 82 | PPC_SET_SPECIAL_PURPOSE_REGISTER(FSL_EIS_MAS0, mmu.MAS0.R); |
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| 83 | __asm__ volatile ("tlbre"); |
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| 84 | mmu.MAS1.R = PPC_SPECIAL_PURPOSE_REGISTER(FSL_EIS_MAS1); |
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| 85 | mmu.MAS1.B.VALID = 0; |
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| 86 | PPC_SET_SPECIAL_PURPOSE_REGISTER(FSL_EIS_MAS1, mmu.MAS1.R); |
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| 87 | __asm__ volatile ("tlbwe"); |
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[dbb3211a] | 88 | #endif |
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[574fb67] | 89 | } |
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| 90 | |
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| 91 | void bsp_start(void) |
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| 92 | { |
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| 93 | ppc_cpu_id_t myCpu; |
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| 94 | ppc_cpu_revision_t myCpuRevision; |
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| 95 | |
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[9e7758b] | 96 | null_pointer_protection(); |
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[08013e8] | 97 | |
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| 98 | /* |
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| 99 | * make sure BSS/SBSS is cleared |
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| 100 | */ |
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[9e7758b] | 101 | memset(&bsp_section_bss_begin [0], 0, (size_t) bsp_section_bss_size); |
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[ac7af4a] | 102 | |
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[574fb67] | 103 | /* |
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| 104 | * Get CPU identification dynamically. Note that the get_ppc_cpu_type() |
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| 105 | * function store the result in global variables so that it can be used |
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| 106 | * latter... |
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| 107 | */ |
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| 108 | myCpu = get_ppc_cpu_type(); |
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| 109 | myCpuRevision = get_ppc_cpu_revision(); |
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[ac7af4a] | 110 | |
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[08013e8] | 111 | /* |
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| 112 | * determine clock speed |
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| 113 | */ |
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[dafacfa7] | 114 | bsp_clock_speed = mpc55xx_get_system_clock() / MPC55XX_SYSTEM_CLOCK_DIVIDER; |
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[ac7af4a] | 115 | |
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[dbb3211a] | 116 | /* Time reference value */ |
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| 117 | bsp_clicks_per_usec = bsp_clock_speed / 1000000; |
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| 118 | |
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[574fb67] | 119 | /* Initialize exceptions */ |
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[9e7758b] | 120 | ppc_exc_vector_base = (uint32_t) mpc55xx_exc_vector_base; |
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[b1e8a58] | 121 | ppc_exc_initialize( |
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[2d2de4eb] | 122 | PPC_INTERRUPT_DISABLE_MASK_DEFAULT, |
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[9e7758b] | 123 | (uintptr_t) bsp_section_work_begin, |
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[75524a5e] | 124 | rtems_configuration_get_interrupt_stack_size() |
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[2d2de4eb] | 125 | ); |
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[601d500] | 126 | ppc_exc_set_handler(ASM_ALIGN_VECTOR, ppc_exc_alignment_handler); |
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[574fb67] | 127 | |
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| 128 | /* Initialize interrupts */ |
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[dd8df59] | 129 | bsp_interrupt_initialize(); |
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[ac7af4a] | 130 | |
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[9e7758b] | 131 | mpc55xx_edma_init(); |
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[a762dc2] | 132 | #ifdef MPC55XX_EMIOS_PRESCALER |
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| 133 | mpc55xx_emios_initialize(MPC55XX_EMIOS_PRESCALER); |
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| 134 | #endif |
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| 135 | } |
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