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 Source file for MPC55XX interrupt support. |
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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 | |
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21 | #include <mpc55xx/regs.h> |
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22 | |
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23 | #include <libcpu/raw_exception.h> |
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24 | #include <libcpu/powerpc-utility.h> |
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25 | |
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26 | #include <bsp/irq.h> |
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27 | #include <bsp/irq-generic.h> |
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28 | #include <bsp/ppc_exc_bspsupp.h> |
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29 | |
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30 | #define RTEMS_STATUS_CHECKS_USE_PRINTK |
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31 | |
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32 | #include <rtems/status-checks.h> |
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33 | |
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34 | /** |
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35 | * @brief Returns the priority @a priority of IRQ @a vector from the INTC. |
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36 | */ |
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37 | rtems_status_code mpc55xx_intc_get_priority( rtems_vector_number vector, unsigned *priority) |
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38 | { |
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39 | if (MPC55XX_IRQ_IS_VALID( vector)) { |
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40 | *priority = INTC.PSR [vector].B.PRI; |
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41 | return RTEMS_SUCCESSFUL; |
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42 | } else { |
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43 | *priority = MPC55XX_INTC_INVALID_PRIORITY; |
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44 | return RTEMS_INVALID_NUMBER; |
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45 | } |
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46 | } |
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47 | |
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48 | /** |
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49 | * @brief Sets the priority of IRQ @a vector to @a priority at the INTC. |
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50 | */ |
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51 | rtems_status_code mpc55xx_intc_set_priority( rtems_vector_number vector, unsigned priority) |
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52 | { |
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53 | if (MPC55XX_IRQ_IS_VALID( vector) && MPC55XX_INTC_IS_VALID_PRIORITY( priority)) { |
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54 | INTC.PSR [vector].B.PRI = priority; |
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55 | if (INTC.PSR [vector].B.PRI == priority) { |
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56 | return RTEMS_SUCCESSFUL; |
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57 | } else { |
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58 | return RTEMS_IO_ERROR; |
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59 | } |
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60 | } else { |
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61 | return RTEMS_INVALID_NUMBER; |
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62 | } |
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63 | } |
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64 | |
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65 | /** |
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66 | * @brief Raises the software IRQ with number @a vector. |
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67 | */ |
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68 | rtems_status_code mpc55xx_intc_raise_software_irq( rtems_vector_number vector) |
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69 | { |
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70 | if (MPC55XX_IRQ_IS_SOFTWARE( vector)) { |
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71 | INTC.SSCIR [vector].B.SET = 1; |
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72 | return RTEMS_SUCCESSFUL; |
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73 | } else { |
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74 | return RTEMS_INVALID_NUMBER; |
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75 | } |
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76 | } |
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77 | |
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78 | /** |
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79 | * @brief Clears the software IRQ with number @a vector. |
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80 | */ |
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81 | rtems_status_code mpc55xx_intc_clear_software_irq( rtems_vector_number vector) |
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82 | { |
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83 | if (MPC55XX_IRQ_IS_SOFTWARE( vector)) { |
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84 | INTC.SSCIR [vector].B.CLR = 1; |
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85 | return RTEMS_SUCCESSFUL; |
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86 | } else { |
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87 | return RTEMS_INVALID_NUMBER; |
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88 | } |
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89 | } |
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90 | |
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91 | /** |
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92 | * @brief Installs interrupt handler and sets priority. |
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93 | */ |
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94 | rtems_status_code mpc55xx_interrupt_handler_install( |
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95 | rtems_vector_number vector, |
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96 | const char *info, |
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97 | rtems_option options, |
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98 | unsigned priority, |
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99 | rtems_interrupt_handler handler, |
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100 | void *arg |
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101 | ) |
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102 | { |
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103 | if (MPC55XX_IRQ_IS_VALID( vector) && MPC55XX_INTC_IS_VALID_PRIORITY( priority)) { |
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104 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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105 | |
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106 | sc = rtems_interrupt_handler_install( vector, info, options, handler, arg); |
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107 | RTEMS_CHECK_SC( sc, "Install interrupt handler"); |
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108 | |
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109 | return mpc55xx_intc_set_priority( vector, priority); |
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110 | } else { |
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111 | return RTEMS_INVALID_NUMBER; |
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112 | } |
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113 | } |
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114 | |
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115 | /** |
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116 | * @brief External exception handler. |
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117 | */ |
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118 | static int mpc55xx_external_exception_handler( BSP_Exception_frame *frame, unsigned exception_number) |
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119 | { |
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120 | /* Acknowlege interrupt request */ |
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121 | rtems_vector_number vector = INTC.IACKR.B.INTVEC; |
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122 | |
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123 | /* Save machine state and enable external exceptions */ |
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124 | uint32_t msr = ppc_external_exceptions_enable(); |
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125 | |
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126 | /* Dispatch interrupt handlers */ |
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127 | bsp_interrupt_handler_dispatch( vector); |
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128 | |
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129 | /* Restore machine state */ |
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130 | ppc_external_exceptions_disable( msr); |
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131 | |
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132 | /* End of interrupt */ |
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133 | INTC.EOIR.R = 1; |
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134 | |
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135 | return 0; |
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136 | } |
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137 | |
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138 | rtems_status_code bsp_interrupt_facility_initialize() |
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139 | { |
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140 | /* Install exception handler */ |
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141 | if (ppc_exc_set_handler( ASM_EXT_VECTOR, mpc55xx_external_exception_handler)) { |
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142 | return RTEMS_IO_ERROR; |
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143 | } |
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144 | |
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145 | /* Initialize interrupt controller */ |
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146 | |
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147 | /* Software vector mode */ |
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148 | INTC.MCR.B.VTES = 0; |
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149 | INTC.MCR.B.HVEN = 0; |
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150 | |
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151 | /* Set current priority to 0 */ |
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152 | INTC.CPR.B.PRI = 0; |
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153 | |
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154 | return RTEMS_SUCCESSFUL; |
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155 | } |
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156 | |
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157 | rtems_status_code bsp_interrupt_vector_enable( rtems_vector_number vector) |
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158 | { |
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159 | if (MPC55XX_IRQ_IS_VALID( vector)) { |
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160 | return mpc55xx_intc_set_priority( vector, MPC55XX_INTC_DEFAULT_PRIORITY); |
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161 | } else { |
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162 | return RTEMS_SUCCESSFUL; |
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163 | } |
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164 | } |
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165 | |
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166 | rtems_status_code bsp_interrupt_vector_disable( rtems_vector_number vector) |
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167 | { |
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168 | if (MPC55XX_IRQ_IS_VALID( vector)) { |
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169 | return mpc55xx_intc_set_priority( vector, MPC55XX_INTC_DISABLED_PRIORITY); |
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170 | } else { |
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171 | return RTEMS_SUCCESSFUL; |
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172 | } |
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173 | } |
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174 | |
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175 | void bsp_interrupt_handler_default( rtems_vector_number vector) |
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176 | { |
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177 | /* Do nothing */ |
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178 | } |
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