1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup tqm8xx |
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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 |
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18 | * found in the file LICENSE in this distribution or at |
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19 | * http://www.rtems.org/license/LICENSE. |
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20 | */ |
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21 | |
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22 | #include <stdlib.h> |
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23 | |
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24 | #include <rtems.h> |
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25 | #include <rtems/counter.h> |
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26 | |
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27 | #include <libcpu/powerpc-utility.h> |
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28 | |
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29 | #include <bsp.h> |
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30 | #include <bsp/vectors.h> |
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31 | #include <bsp/bootcard.h> |
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32 | #include <bsp/irq-generic.h> |
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33 | |
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34 | #ifdef BSP_HAS_TQMMON |
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35 | /* |
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36 | * FIXME: TQ Monitor structure |
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37 | */ |
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38 | #endif /* BSP_HAS_TQMMON */ |
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39 | |
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40 | /* Configuration parameters for console driver, ... */ |
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41 | uint32_t BSP_bus_frequency; |
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42 | |
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43 | /* Configuration parameter for clock driver */ |
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44 | uint32_t bsp_time_base_frequency; |
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45 | |
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46 | /* Legacy */ |
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47 | uint32_t bsp_clicks_per_usec; /* for PIT driver: OSCCLK */ |
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48 | |
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49 | static const char *bsp_tqm_get_cib_string( const char *cib_id) |
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50 | { |
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51 | char srch_pattern[10] = ""; |
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52 | char *fnd_str; |
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53 | /* |
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54 | * create search pattern |
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55 | */ |
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56 | strcat(srch_pattern,"-"); |
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57 | strncat(srch_pattern, |
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58 | cib_id, |
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59 | sizeof(srch_pattern)-1-strlen(srch_pattern)); |
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60 | strncat(srch_pattern, |
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61 | " ", |
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62 | sizeof(srch_pattern)-1-strlen(srch_pattern)); |
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63 | /* |
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64 | * search for pattern in info block (CIB) |
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65 | */ |
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66 | fnd_str = strstr((const char *)TQM_CONF_INFO_BLOCK_ADDR,srch_pattern); |
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67 | |
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68 | if (fnd_str == NULL) { |
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69 | return NULL; |
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70 | } |
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71 | else { |
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72 | /* |
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73 | * found? then advance behind search pattern |
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74 | */ |
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75 | return fnd_str + strlen(srch_pattern); |
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76 | } |
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77 | } |
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78 | |
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79 | static rtems_status_code bsp_tqm_get_cib_uint32( const char *cib_id, |
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80 | uint32_t *result) |
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81 | { |
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82 | const char *item_ptr; |
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83 | char *end_ptr; |
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84 | item_ptr = bsp_tqm_get_cib_string(cib_id); |
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85 | if (item_ptr == NULL) { |
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86 | return RTEMS_INVALID_ID; |
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87 | } |
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88 | /* |
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89 | * convert string to uint32 |
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90 | */ |
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91 | *result = strtoul(item_ptr,&end_ptr,10); |
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92 | return RTEMS_SUCCESSFUL; |
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93 | } |
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94 | |
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95 | void bsp_start( void) |
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96 | { |
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97 | |
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98 | uintptr_t interrupt_stack_start = (uintptr_t) bsp_interrupt_stack_start; |
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99 | uintptr_t interrupt_stack_size = (uintptr_t) bsp_interrupt_stack_end |
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100 | - interrupt_stack_start; |
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101 | |
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102 | /* |
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103 | * Get CPU identification dynamically. Note that the get_ppc_cpu_type() |
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104 | * function stores the result in global variables so that it can be used |
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105 | * later... |
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106 | */ |
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107 | get_ppc_cpu_type(); |
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108 | get_ppc_cpu_revision(); |
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109 | |
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110 | /* Basic CPU initialization */ |
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111 | cpu_init(); |
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112 | |
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113 | /* |
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114 | * Enable instruction and data caches. Do not force writethrough mode. |
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115 | */ |
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116 | |
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117 | #if BSP_INSTRUCTION_CACHE_ENABLED |
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118 | rtems_cache_enable_instruction(); |
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119 | #endif |
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120 | |
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121 | #if BSP_DATA_CACHE_ENABLED |
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122 | rtems_cache_enable_data(); |
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123 | #endif |
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124 | |
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125 | /* |
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126 | * This is evaluated during runtime, so it should be ok to set it |
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127 | * before we initialize the drivers. |
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128 | */ |
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129 | |
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130 | /* Initialize some device driver parameters */ |
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131 | /* |
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132 | * get the (internal) bus frequency |
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133 | * NOTE: the external bus may be clocked at a lower speed |
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134 | * but this does not concern the internal units like PIT, |
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135 | * DEC, baudrate generator etc) |
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136 | */ |
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137 | if (RTEMS_SUCCESSFUL != |
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138 | bsp_tqm_get_cib_uint32("cu", |
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139 | &BSP_bus_frequency)) { |
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140 | rtems_panic("Cannot determine BUS frequency\n"); |
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141 | } |
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142 | |
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143 | bsp_time_base_frequency = BSP_bus_frequency / 16; |
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144 | bsp_clicks_per_usec = bsp_time_base_frequency / 1000000; |
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145 | rtems_counter_initialize_converter(bsp_time_base_frequency); |
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146 | |
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147 | /* Initialize exception handler */ |
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148 | ppc_exc_initialize(interrupt_stack_start, interrupt_stack_size); |
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149 | |
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150 | /* Initalize interrupt support */ |
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151 | bsp_interrupt_initialize(); |
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152 | |
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153 | #ifdef SHOW_MORE_INIT_SETTINGS |
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154 | printk("Exit from bspstart\n"); |
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155 | #endif |
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156 | } |
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