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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10 | * Copyright (c) 2008-2011 embedded brains GmbH. All rights reserved. |
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11 | * |
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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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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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26 | #include <mpc55xx/emios.h> |
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27 | |
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28 | #include <string.h> |
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29 | |
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30 | #include <rtems.h> |
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31 | #include <rtems/config.h> |
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32 | |
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33 | #include <libcpu/powerpc-utility.h> |
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34 | #include <bsp/vectors.h> |
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35 | |
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36 | #include <bsp.h> |
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37 | #include <bsp/bootcard.h> |
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38 | #include <bsp/irq.h> |
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39 | #include <bsp/irq-generic.h> |
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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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43 | |
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44 | extern Heap_Control *RTEMS_Malloc_Heap; |
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45 | |
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46 | /* Symbols defined in linker command file */ |
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47 | LINKER_SYMBOL(mpc55xx_exc_vector_base); |
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48 | |
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49 | unsigned int bsp_clock_speed = 0; |
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50 | |
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51 | uint32_t bsp_clicks_per_usec = 0; |
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52 | |
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53 | void BSP_panic( char *s) |
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54 | { |
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55 | rtems_interrupt_level level; |
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56 | |
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57 | rtems_interrupt_disable( level); |
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58 | |
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59 | printk( "%s PANIC %s\n", _RTEMS_version, s); |
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60 | |
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61 | while (1) { |
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62 | /* Do nothing */ |
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63 | } |
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64 | } |
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65 | |
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66 | void _BSP_Fatal_error( unsigned n) |
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67 | { |
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68 | rtems_interrupt_level level; |
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69 | |
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70 | rtems_interrupt_disable( level); |
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71 | |
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72 | printk( "%s PANIC ERROR %u\n", _RTEMS_version, n); |
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73 | |
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74 | while (1) { |
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75 | /* Do nothing */ |
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76 | } |
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77 | } |
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78 | |
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79 | static void null_pointer_protection(void) |
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80 | { |
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81 | #ifdef MPC55XX_NULL_POINTER_PROTECTION |
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82 | struct MMU_tag mmu = { .MAS0 = { .B = { .TLBSEL = 1, .ESEL = 1 } } }; |
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83 | |
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84 | PPC_SET_SPECIAL_PURPOSE_REGISTER(FSL_EIS_MAS0, mmu.MAS0.R); |
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85 | __asm__ volatile ("tlbre"); |
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86 | mmu.MAS1.R = PPC_SPECIAL_PURPOSE_REGISTER(FSL_EIS_MAS1); |
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87 | mmu.MAS1.B.VALID = 0; |
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88 | PPC_SET_SPECIAL_PURPOSE_REGISTER(FSL_EIS_MAS1, mmu.MAS1.R); |
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89 | __asm__ volatile ("tlbwe"); |
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90 | #endif |
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91 | } |
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92 | |
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93 | void bsp_start(void) |
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94 | { |
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95 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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96 | ppc_cpu_id_t myCpu; |
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97 | ppc_cpu_revision_t myCpuRevision; |
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98 | |
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99 | null_pointer_protection(); |
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100 | |
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101 | /* |
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102 | * make sure BSS/SBSS is cleared |
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103 | */ |
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104 | memset(&bsp_section_bss_begin [0], 0, (size_t) bsp_section_bss_size); |
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105 | |
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106 | /* |
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107 | * Get CPU identification dynamically. Note that the get_ppc_cpu_type() |
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108 | * function store the result in global variables so that it can be used |
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109 | * latter... |
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110 | */ |
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111 | myCpu = get_ppc_cpu_type(); |
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112 | myCpuRevision = get_ppc_cpu_revision(); |
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113 | |
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114 | /* |
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115 | * determine clock speed |
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116 | */ |
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117 | bsp_clock_speed = mpc55xx_get_system_clock() / MPC55XX_SYSTEM_CLOCK_DIVIDER; |
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118 | |
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119 | /* Time reference value */ |
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120 | bsp_clicks_per_usec = bsp_clock_speed / 1000000; |
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121 | |
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122 | /* Initialize exceptions */ |
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123 | ppc_exc_vector_base = (uint32_t) mpc55xx_exc_vector_base; |
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124 | sc = ppc_exc_initialize( |
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125 | PPC_INTERRUPT_DISABLE_MASK_DEFAULT, |
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126 | (uintptr_t) bsp_section_work_begin, |
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127 | Configuration.interrupt_stack_size |
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128 | ); |
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129 | if (sc != RTEMS_SUCCESSFUL) { |
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130 | BSP_panic( "Cannot initialize exceptions"); |
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131 | } |
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132 | ppc_exc_set_handler(ASM_ALIGN_VECTOR, ppc_exc_alignment_handler); |
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133 | |
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134 | /* Initialize interrupts */ |
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135 | sc = bsp_interrupt_initialize(); |
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136 | if (sc != RTEMS_SUCCESSFUL) { |
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137 | BSP_panic( "Cannot initialize interrupts"); |
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138 | } |
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139 | |
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140 | mpc55xx_edma_init(); |
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141 | #ifdef MPC55XX_EMIOS_PRESCALER |
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142 | mpc55xx_emios_initialize(MPC55XX_EMIOS_PRESCALER); |
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143 | #endif |
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144 | } |
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145 | |
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146 | void bsp_pretasking_hook(void) |
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147 | { |
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148 | #if MPC55XX_CHIP_TYPE / 10 == 564 |
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149 | _Heap_Extend( |
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150 | RTEMS_Malloc_Heap, |
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151 | bsp_section_rwextra_end, |
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152 | (uintptr_t) bsp_ram_end |
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153 | - (uintptr_t) bsp_section_rwextra_end, |
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154 | NULL |
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155 | ); |
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156 | #endif |
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157 | } |
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