1 | /* irq_init.c |
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2 | * |
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3 | * This file contains the implementation of rtems initialization |
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4 | * related to interrupt handling. |
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5 | * |
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6 | * CopyRight (C) 1999 valette@crf.canon.fr |
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7 | * |
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8 | * Enhanced by Jay Kulpinski <jskulpin@eng01.gdds.com> |
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9 | * to make it valid for MVME2300 Motorola boards. |
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10 | * |
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11 | * Till Straumann <strauman@slac.stanford.edu>, 12/20/2001: |
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12 | * Use the new interface to openpic_init |
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13 | * |
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14 | * The license and distribution terms for this file may be |
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15 | * found in the file LICENSE in this distribution or at |
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16 | * http://www.rtems.com/license/LICENSE. |
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17 | * |
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18 | * irq_init.c,v 1.6.2.5 2003/09/04 18:45:20 joel Exp |
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19 | */ |
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20 | |
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21 | #include <libcpu/io.h> |
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22 | #include <libcpu/spr.h> |
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23 | #include <bsp/irq.h> |
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24 | #include <bsp.h> |
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25 | #include <libcpu/raw_exception.h> |
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26 | #include <rtems/bspIo.h> |
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27 | #if 0 |
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28 | #include <bsp/pci.h> |
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29 | #include <bsp/residual.h> |
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30 | #include <bsp/openpic.h> |
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31 | #include <bsp/motorola.h> |
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32 | #endif |
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33 | |
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34 | |
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35 | /* |
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36 | #define SHOW_ISA_PCI_BRIDGE_SETTINGS |
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37 | */ |
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38 | |
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39 | typedef struct { |
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40 | unsigned char bus; /* few chance the PCI/ISA bridge is not on first bus but ... */ |
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41 | unsigned char device; |
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42 | unsigned char function; |
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43 | } pci_isa_bridge_device; |
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44 | |
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45 | pci_isa_bridge_device* via_82c586 = 0; |
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46 | |
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47 | extern unsigned int external_exception_vector_prolog_code_size[]; |
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48 | extern void external_exception_vector_prolog_code(); |
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49 | extern unsigned int decrementer_exception_vector_prolog_code_size[]; |
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50 | extern void decrementer_exception_vector_prolog_code(); |
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51 | |
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52 | /* |
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53 | * default on/off function |
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54 | */ |
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55 | static void nop_func(){} |
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56 | /* |
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57 | * default isOn function |
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58 | */ |
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59 | static int not_connected() {return 0;} |
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60 | /* |
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61 | * default possible isOn function |
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62 | */ |
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63 | static int connected() {return 1;} |
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64 | |
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65 | static rtems_irq_connect_data rtemsIrq[BSP_IRQ_NUMBER]; |
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66 | static rtems_irq_global_settings initial_config; |
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67 | static rtems_irq_connect_data defaultIrq = { |
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68 | /* vectorIdex, hdl , handle , on , off , isOn */ |
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69 | 0, nop_func , NULL , nop_func , nop_func , not_connected |
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70 | }; |
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71 | static rtems_irq_prio irqPrioTable[BSP_IRQ_NUMBER]={ |
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72 | /* |
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73 | * actual rpiorities for interrupt : |
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74 | * 0 means that only current interrupt is masked |
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75 | * 255 means all other interrupts are masked |
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76 | */ |
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77 | /* |
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78 | * ISA interrupts. |
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79 | * The second entry has a priority of 255 because |
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80 | * it is the slave pic entry and is should always remain |
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81 | * unmasked. |
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82 | */ |
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83 | 0,0, |
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84 | 255, |
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85 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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86 | /* |
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87 | * PCI Interrupts |
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88 | */ |
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89 | 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, /* for raven prio 0 means unactive... */ |
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90 | /* |
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91 | * Processor exceptions handled as interrupts |
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92 | */ |
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93 | 0 |
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94 | }; |
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95 | |
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96 | void VIA_isa_bridge_interrupts_setup(void) |
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97 | { |
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98 | printk("VIA_isa_bridge_interrupts_setup - Shouldn't get here!\n"); |
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99 | return; |
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100 | } |
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101 | |
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102 | /* |
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103 | * This code assumes the exceptions management setup has already |
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104 | * been done. We just need to replace the exceptions that will |
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105 | * be handled like interrupt. On mcp750/mpc750 and many PPC processors |
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106 | * this means the decrementer exception and the external exception. |
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107 | */ |
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108 | void BSP_rtems_irq_mng_init(unsigned cpuId) |
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109 | { |
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110 | rtems_raw_except_connect_data vectorDesc; |
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111 | int i; |
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112 | |
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113 | /* |
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114 | * First initialize the Interrupt management hardware |
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115 | */ |
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116 | |
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117 | /* |
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118 | * Initialize Rtems management interrupt table |
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119 | */ |
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120 | /* |
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121 | * re-init the rtemsIrq table |
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122 | */ |
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123 | for (i = 0; i < BSP_IRQ_NUMBER; i++) { |
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124 | rtemsIrq[i] = defaultIrq; |
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125 | rtemsIrq[i].name = i; |
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126 | } |
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127 | /* |
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128 | * Init initial Interrupt management config |
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129 | */ |
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130 | initial_config.irqNb = BSP_IRQ_NUMBER; |
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131 | initial_config.defaultEntry = defaultIrq; |
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132 | initial_config.irqHdlTbl = rtemsIrq; |
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133 | initial_config.irqBase = BSP_ASM_IRQ_VECTOR_BASE; |
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134 | initial_config.irqPrioTbl = irqPrioTable; |
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135 | |
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136 | if (!BSP_rtems_irq_mngt_set(&initial_config)) { |
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137 | /* |
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138 | * put something here that will show the failure... |
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139 | */ |
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140 | BSP_panic("Unable to initialize RTEMS interrupt Management!!! System locked\n"); |
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141 | } |
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142 | |
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143 | /* |
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144 | * We must connect the raw irq handler for the two |
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145 | * expected interrupt sources : decrementer and external interrupts. |
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146 | */ |
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147 | vectorDesc.exceptIndex = ASM_DEC_VECTOR; |
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148 | vectorDesc.hdl.vector = ASM_DEC_VECTOR; |
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149 | vectorDesc.hdl.raw_hdl = decrementer_exception_vector_prolog_code; |
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150 | vectorDesc.hdl.raw_hdl_size = (unsigned) decrementer_exception_vector_prolog_code_size; |
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151 | vectorDesc.on = nop_func; |
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152 | vectorDesc.off = nop_func; |
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153 | vectorDesc.isOn = connected; |
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154 | if (!ppc_set_exception (&vectorDesc)) { |
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155 | BSP_panic("Unable to initialize RTEMS decrementer raw exception\n"); |
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156 | } |
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157 | vectorDesc.exceptIndex = ASM_EXT_VECTOR; |
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158 | vectorDesc.hdl.vector = ASM_EXT_VECTOR; |
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159 | vectorDesc.hdl.raw_hdl = external_exception_vector_prolog_code; |
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160 | vectorDesc.hdl.raw_hdl_size = (unsigned) external_exception_vector_prolog_code_size; |
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161 | if (!ppc_set_exception (&vectorDesc)) { |
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162 | BSP_panic("Unable to initialize RTEMS external raw exception\n"); |
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163 | } |
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164 | #ifdef TRACE_IRQ_INIT |
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165 | printk("RTEMS IRQ management is now operationnal\n"); |
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166 | #endif |
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167 | } |
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168 | |
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