1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup mpc83xx |
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5 | * |
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6 | * @brief Source for 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 |
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11 | * Embedded Brains GmbH |
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12 | * Obere Lagerstr. 30 |
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13 | * D-82178 Puchheim |
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14 | * Germany |
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15 | * rtems@embedded-brains.de |
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16 | * |
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17 | * The license and distribution terms for this file may be found in the file |
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18 | * LICENSE in this distribution or at http://www.rtems.com/license/LICENSE. |
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19 | * |
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20 | * $Id$ |
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21 | */ |
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22 | |
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23 | #include <libcpu/powerpc-utility.h> |
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24 | |
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25 | #include <bsp.h> |
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26 | #include <bsp/vectors.h> |
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27 | #include <bsp/bootcard.h> |
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28 | #include <bsp/irq-generic.h> |
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29 | |
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30 | #ifdef HAS_UBOOT |
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31 | |
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32 | /* |
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33 | * We want this in the data section, because the startup code clears the BSS |
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34 | * section after the initialization of the board info. |
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35 | */ |
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36 | bd_t bsp_uboot_board_info = { .bi_baudrate = 123 }; |
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37 | |
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38 | /* Size in words */ |
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39 | const size_t bsp_uboot_board_info_size = (sizeof( bd_t) + 3) / 4; |
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40 | |
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41 | #endif /* HAS_UBOOT */ |
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42 | |
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43 | /* Configuration parameters for console driver, ... */ |
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44 | unsigned int BSP_bus_frequency; |
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45 | |
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46 | /* Configuration parameters for clock driver, ... */ |
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47 | uint32_t bsp_clicks_per_usec; |
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48 | |
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49 | /* Default decrementer exception handler */ |
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50 | static int mpc83xx_decrementer_exception_handler( BSP_Exception_frame *frame, unsigned number) |
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51 | { |
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52 | ppc_set_decrementer_register(UINT32_MAX); |
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53 | |
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54 | return 0; |
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55 | } |
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56 | |
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57 | void BSP_panic(char *s) |
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58 | { |
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59 | rtems_interrupt_level level; |
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60 | |
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61 | rtems_interrupt_disable(level); |
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62 | |
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63 | printk("%s PANIC %s\n", rtems_get_version_string(), s); |
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64 | |
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65 | while (1) { |
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66 | /* Do nothing */ |
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67 | } |
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68 | } |
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69 | |
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70 | void _BSP_Fatal_error(unsigned n) |
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71 | { |
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72 | rtems_interrupt_level level; |
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73 | |
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74 | rtems_interrupt_disable( level); |
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75 | |
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76 | printk( "%s PANIC ERROR %u\n", rtems_get_version_string(), n); |
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77 | |
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78 | while (1) { |
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79 | /* Do nothing */ |
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80 | } |
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81 | } |
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82 | |
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83 | void bsp_start( void) |
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84 | { |
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85 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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86 | |
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87 | ppc_cpu_id_t myCpu; |
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88 | ppc_cpu_revision_t myCpuRevision; |
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89 | |
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90 | uintptr_t interrupt_stack_start = (uintptr_t) bsp_interrupt_stack_start; |
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91 | uintptr_t interrupt_stack_size = (uintptr_t) bsp_interrupt_stack_size; |
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92 | |
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93 | /* |
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94 | * Get CPU identification dynamically. Note that the get_ppc_cpu_type() function |
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95 | * store the result in global variables so that it can be used latter... |
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96 | */ |
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97 | myCpu = get_ppc_cpu_type(); |
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98 | myCpuRevision = get_ppc_cpu_revision(); |
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99 | |
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100 | /* Basic CPU initialization */ |
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101 | cpu_init(); |
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102 | |
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103 | /* |
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104 | * Enable instruction and data caches. Do not force writethrough mode. |
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105 | */ |
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106 | |
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107 | #if INSTRUCTION_CACHE_ENABLE |
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108 | rtems_cache_enable_instruction(); |
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109 | #endif |
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110 | |
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111 | #if DATA_CACHE_ENABLE |
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112 | rtems_cache_enable_data(); |
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113 | #endif |
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114 | |
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115 | /* |
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116 | * This is evaluated during runtime, so it should be ok to set it |
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117 | * before we initialize the drivers. |
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118 | */ |
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119 | |
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120 | /* Initialize some device driver parameters */ |
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121 | |
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122 | #ifdef HAS_UBOOT |
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123 | BSP_bus_frequency = bsp_uboot_board_info.bi_busfreq; |
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124 | bsp_clicks_per_usec = bsp_uboot_board_info.bi_busfreq / 4000000; |
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125 | #else /* HAS_UBOOT */ |
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126 | BSP_bus_frequency = BSP_CLKIN_FRQ * BSP_SYSPLL_MF / BSP_SYSPLL_CKID; |
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127 | bsp_clicks_per_usec = BSP_bus_frequency / 4000000; |
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128 | #endif /* HAS_UBOOT */ |
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129 | |
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130 | /* Initialize exception handler */ |
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131 | sc = ppc_exc_initialize( |
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132 | PPC_INTERRUPT_DISABLE_MASK_DEFAULT, |
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133 | interrupt_stack_start, |
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134 | interrupt_stack_size |
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135 | ); |
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136 | if (sc != RTEMS_SUCCESSFUL) { |
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137 | BSP_panic("cannot initialize exceptions"); |
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138 | } |
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139 | |
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140 | /* Install default handler for the decrementer exception */ |
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141 | sc = ppc_exc_set_handler( ASM_DEC_VECTOR, mpc83xx_decrementer_exception_handler); |
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142 | if (sc != RTEMS_SUCCESSFUL) { |
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143 | BSP_panic("cannot install decrementer exception handler"); |
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144 | } |
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145 | |
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146 | /* Initalize interrupt support */ |
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147 | sc = bsp_interrupt_initialize(); |
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148 | if (sc != RTEMS_SUCCESSFUL) { |
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149 | BSP_panic("cannot intitialize interrupts\n"); |
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150 | } |
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151 | |
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152 | #ifdef SHOW_MORE_INIT_SETTINGS |
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153 | printk("Exit from bspstart\n"); |
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154 | #endif |
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155 | } |
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