1 | /////////////////////////////////////////////////////////////////////////////////// |
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2 | // File : xcu_driver.c |
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3 | // Date : 23/05/2013 |
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4 | // Author : alain greiner |
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5 | // Copyright (c) UPMC-LIP6 |
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6 | /////////////////////////////////////////////////////////////////////////////////// |
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7 | // This peripheral is replicated in all clusters containing processors. |
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8 | // |
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9 | // SEG_XCU_BASE and PERI_CLUSTER_INCREMENT must be defined in hard_config.h file. |
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10 | /////////////////////////////////////////////////////////////////////////////////// |
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11 | |
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12 | #include <hard_config.h> |
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13 | #include <giet_config.h> |
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14 | #include <xcu_driver.h> |
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15 | #include <tty_driver.h> |
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16 | #include <mapping_info.h> |
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17 | #include <utils.h> |
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18 | #include <io.h> |
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19 | |
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20 | #if !defined(X_SIZE) |
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21 | # error: You must define X_SIZE in the hard_config.h file |
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22 | #endif |
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23 | |
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24 | #if !defined(Y_SIZE) |
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25 | # error: You must define X_SIZE in the hard_config.h file |
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26 | #endif |
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27 | |
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28 | #if !defined(X_WIDTH) |
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29 | # error: You must define X_WIDTH in the hard_config.h file |
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30 | #endif |
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31 | |
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32 | #if !defined(Y_WIDTH) |
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33 | # error: You must define X_WIDTH in the hard_config.h file |
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34 | #endif |
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35 | |
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36 | #if !defined(NB_PROCS_MAX) |
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37 | # error: You must define NB_PROCS_MAX in the hard_config.h file |
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38 | #endif |
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39 | |
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40 | #if !defined( USE_XCU ) |
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41 | # error: You must define USE_XCU in the hard_config.h file |
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42 | #endif |
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43 | |
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44 | #if !defined( SEG_XCU_BASE ) |
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45 | # error: You must define SEG_XCU_BASE in the hard_config.h file |
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46 | #endif |
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47 | |
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48 | #if !defined( PERI_CLUSTER_INCREMENT ) |
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49 | # error: You must define PERI_CLUSTER_INCREMENT in the hard_config.h file |
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50 | #endif |
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51 | |
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52 | /////////////////////////////////////////////////////////////////////////////// |
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53 | // This low level function returns the value contained in register "index" |
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54 | // in the XCU component contained in cluster "cluster_xy" |
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55 | /////////////////////////////////////////////////////////////////////////////// |
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56 | static |
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57 | unsigned int _xcu_get_register( unsigned int cluster_xy, // cluster index |
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58 | unsigned int func, // function index |
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59 | unsigned int index ) // register index |
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60 | { |
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61 | unsigned int vaddr = |
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62 | SEG_XCU_BASE + |
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63 | (cluster_xy * PERI_CLUSTER_INCREMENT) + |
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64 | (XCU_REG(func, index) << 2); |
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65 | |
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66 | return ioread32( (void*)vaddr ); |
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67 | } |
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68 | |
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69 | /////////////////////////////////////////////////////////////////////////////// |
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70 | // This low level function sets a new value in register "index" |
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71 | // in the XCU component contained in cluster "cluster_xy" |
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72 | /////////////////////////////////////////////////////////////////////////////// |
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73 | static |
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74 | void _xcu_set_register( unsigned int cluster_xy, // cluster index |
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75 | unsigned int func, // func index |
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76 | unsigned int index, // register index |
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77 | unsigned int value ) // value to be written |
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78 | { |
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79 | unsigned int vaddr = |
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80 | SEG_XCU_BASE + |
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81 | (cluster_xy * PERI_CLUSTER_INCREMENT) + |
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82 | (XCU_REG(func, index) << 2); |
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83 | |
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84 | iowrite32( (void*)vaddr, value ); |
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85 | } |
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86 | |
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87 | //////////////////////////////////////////////////////////////////////////////// |
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88 | // This function set the mask register for the IRQ type defined by "irq_type", |
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89 | // and for the channel identified by the "cluster_xy" and "channel" arguments. |
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90 | // All '1' bits are set / all '0' bits are not modified. |
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91 | //////////////////////////////////////////////////////////////////////////////// |
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92 | void _xcu_set_mask( unsigned int cluster_xy, |
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93 | unsigned int channel, |
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94 | unsigned int value, |
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95 | unsigned int irq_type ) |
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96 | { |
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97 | #if USE_XCU |
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98 | // parameters checking |
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99 | unsigned int x = cluster_xy >> Y_WIDTH; |
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100 | unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1); |
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101 | if (x >= X_SIZE) _exit(); |
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102 | if (y >= Y_SIZE) _exit(); |
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103 | if (channel >= (NB_PROCS_MAX * IRQ_PER_PROCESSOR)) _exit(); |
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104 | |
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105 | unsigned int func = 0; |
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106 | if (irq_type == IRQ_TYPE_PTI) func = XCU_MSK_PTI_ENABLE; |
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107 | else if (irq_type == IRQ_TYPE_WTI) func = XCU_MSK_WTI_ENABLE; |
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108 | else if (irq_type == IRQ_TYPE_HWI) func = XCU_MSK_HWI_ENABLE; |
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109 | else |
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110 | { |
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111 | _printf("[GIET ERROR] _xcu_set_mask() receives illegal IRQ type\n"); |
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112 | _exit(); |
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113 | } |
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114 | |
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115 | _xcu_set_register(cluster_xy, func, channel, value); |
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116 | |
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117 | #else |
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118 | _printf("[GIET ERROR] _xcu_set_mask() should not be used if USE_XCU not set\n"); |
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119 | _exit(); |
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120 | #endif |
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121 | } |
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122 | |
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123 | //////////////////////////////////////////////////////////////////////////////// |
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124 | // This function returns the index and the type of the highest priority |
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125 | // - active PTI (Timer Interrupt), then |
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126 | // - active HWI (Hardware Interrupt), then |
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127 | // - active WTI (Software Interrupt) |
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128 | // As the hardware can define more than one IRQ per processor, but the GIET |
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129 | // use only one, channel = lpid * IRQ_PER_PROCESSOR. |
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130 | //////////////////////////////////////////////////////////////////////////////// |
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131 | void _xcu_get_index( unsigned int cluster_xy, |
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132 | unsigned int channel, |
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133 | unsigned int * index, |
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134 | unsigned int * irq_type ) |
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135 | { |
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136 | #if USE_XCU |
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137 | // parameters checking |
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138 | unsigned int x = cluster_xy >> Y_WIDTH; |
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139 | unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1); |
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140 | if (x >= X_SIZE) _exit(); |
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141 | if (y >= Y_SIZE) _exit(); |
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142 | if (channel >= (NB_PROCS_MAX * IRQ_PER_PROCESSOR)) _exit(); |
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143 | |
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144 | unsigned int prio = _xcu_get_register(cluster_xy, XCU_PRIO, channel); |
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145 | unsigned int pti_ok = (prio & 0x00000001); |
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146 | unsigned int hwi_ok = (prio & 0x00000002); |
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147 | unsigned int wti_ok = (prio & 0x00000004); |
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148 | unsigned int pti_id = (prio & 0x00001F00) >> 8; |
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149 | unsigned int hwi_id = (prio & 0x001F0000) >> 16; |
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150 | unsigned int wti_id = (prio & 0x1F000000) >> 24; |
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151 | if (pti_ok) |
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152 | { |
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153 | *index = pti_id; |
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154 | *irq_type = IRQ_TYPE_PTI; |
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155 | } |
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156 | else if (hwi_ok) |
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157 | { |
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158 | *index = hwi_id; |
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159 | *irq_type = IRQ_TYPE_HWI; |
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160 | } |
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161 | else if (wti_ok) |
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162 | { |
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163 | *index = wti_id; |
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164 | *irq_type = IRQ_TYPE_WTI; |
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165 | } |
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166 | else |
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167 | { |
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168 | *index = 32; |
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169 | } |
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170 | |
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171 | #else |
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172 | _printf("[GIET ERROR] _xcu_get_index should not be used if USE_XCU is not set\n"); |
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173 | _exit(); |
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174 | #endif |
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175 | } |
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176 | |
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177 | //////////////////////////////////////////////////////////////////////////////// |
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178 | // This function writes the "wdata" value in the mailbox defined |
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179 | // by the "cluster_xy" and "wti_index" arguments. |
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180 | //////////////////////////////////////////////////////////////////////////////// |
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181 | void _xcu_send_wti( unsigned int cluster_xy, |
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182 | unsigned int wti_index, |
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183 | unsigned int wdata ) |
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184 | { |
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185 | #if USE_XCU |
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186 | // parameters checking |
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187 | unsigned int x = cluster_xy >> Y_WIDTH; |
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188 | unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1); |
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189 | if (x >= X_SIZE) _exit(); |
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190 | if (y >= Y_SIZE) _exit(); |
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191 | if (wti_index >= 32) _exit(); |
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192 | |
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193 | _xcu_set_register(cluster_xy, XCU_WTI_REG, wti_index, wdata); |
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194 | |
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195 | #else |
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196 | _printf("[GIET ERROR] _xcu_send_wti() should not be used if USE_XCU is not set\n"); |
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197 | _exit(); |
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198 | #endif |
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199 | } |
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200 | |
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201 | //////////////////////////////////////////////////////////////////////////////// |
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202 | // This function returns the value contained in a WTI mailbox defined by |
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203 | // the cluster_xy and "wti_index" arguments. This value is written in |
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204 | // the "value" argument, and the corresponding WTI is acknowledged. |
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205 | // returns 0 if success, > 0 if error. |
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206 | //////////////////////////////////////////////////////////////////////////////// |
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207 | void _xcu_get_wti_value( unsigned int cluster_xy, |
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208 | unsigned int wti_index, |
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209 | unsigned int * value ) |
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210 | { |
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211 | #if USE_XCU |
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212 | // parameters checking |
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213 | unsigned int x = cluster_xy >> Y_WIDTH; |
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214 | unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1); |
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215 | if (x >= X_SIZE) _exit(); |
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216 | if (y >= Y_SIZE) _exit(); |
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217 | if (wti_index >= 32) _exit(); |
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218 | |
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219 | *value = _xcu_get_register(cluster_xy, XCU_WTI_REG, wti_index); |
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220 | |
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221 | #else |
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222 | _printf("[GIET ERROR] in _xcu_get_wti_value() USE_XCU is not set\n"); |
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223 | _exit(); |
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224 | #endif |
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225 | } |
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226 | |
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227 | //////////////////////////////////////////////////////////////////////////////// |
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228 | // This function returns the address of a WTI mailbox defined by |
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229 | // the "wti_index" argument, in the unsigned int "address" argument. |
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230 | // It is used by the GIET to configurate the IOPIC component. |
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231 | // There is no access to a specific XCU component in a specific cluster. |
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232 | // returns 0 if success, > 0 if error. |
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233 | //////////////////////////////////////////////////////////////////////////////// |
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234 | void _xcu_get_wti_address( unsigned int wti_index, |
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235 | unsigned int * address ) |
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236 | { |
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237 | #if USE_XCU |
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238 | if (wti_index >= 32) _exit(); |
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239 | |
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240 | *address = SEG_XCU_BASE + (XCU_REG(XCU_WTI_REG, wti_index)<<2); |
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241 | |
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242 | #else |
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243 | _printf("[GIET ERROR] in _xcu_get_wti_address() USE_XCU is not set\n"); |
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244 | _exit(); |
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245 | #endif |
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246 | } |
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247 | |
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248 | //////////////////////////////////////////////////////////////////////////////// |
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249 | // This function activates a timer contained in XCU by writing in the |
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250 | // proper register the period value. |
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251 | //////////////////////////////////////////////////////////////////////////////// |
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252 | void _xcu_timer_start( unsigned int cluster_xy, |
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253 | unsigned int pti_index, |
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254 | unsigned int period ) |
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255 | { |
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256 | #if USE_XCU |
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257 | // parameters checking |
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258 | unsigned int x = cluster_xy >> Y_WIDTH; |
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259 | unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1); |
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260 | if (x >= X_SIZE) _exit(); |
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261 | if (y >= Y_SIZE) _exit(); |
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262 | |
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263 | _xcu_set_register(cluster_xy, XCU_PTI_PER, pti_index, period); |
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264 | |
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265 | #else |
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266 | _printf("[GIET ERROR] in _xcu_timer_start() USE_XCU is not set\n"); |
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267 | _exit(); |
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268 | #endif |
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269 | } |
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270 | |
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271 | ////////////////////////////////////////////////////////////////////////////// |
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272 | // This function desactivates a timer in XCU component |
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273 | // by writing in the proper register. |
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274 | ////////////////////////////////////////////////////////////////////////////// |
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275 | void _xcu_timer_stop( unsigned int cluster_xy, |
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276 | unsigned int pti_index) |
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277 | { |
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278 | #if USE_XCU |
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279 | // parameters checking |
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280 | unsigned int x = cluster_xy >> Y_WIDTH; |
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281 | unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1); |
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282 | if (x >= X_SIZE) _exit(); |
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283 | if (y >= Y_SIZE) _exit(); |
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284 | |
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285 | _xcu_set_register(cluster_xy, XCU_PTI_PER, pti_index, 0); |
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286 | |
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287 | #else |
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288 | _printf("[GIET ERROR] in _xcu_timer_stop() USE_XCU is not set\n"); |
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289 | _exit(); |
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290 | #endif |
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291 | } |
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292 | |
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293 | ////////////////////////////////////////////////////////////////////////////// |
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294 | // This function acknowlegge a timer interrupt in XCU |
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295 | // component by reading in the proper XCU register. |
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296 | // It can be used by both the isr_switch() for a "system" timer, |
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297 | // or by the _isr_timer() for an "user" timer. |
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298 | ////////////////////////////////////////////////////////////////////////////// |
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299 | unsigned int _xcu_timer_reset_irq( unsigned int cluster_xy, |
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300 | unsigned int pti_index ) |
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301 | { |
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302 | #if USE_XCU |
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303 | // parameters checking |
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304 | unsigned int x = cluster_xy >> Y_WIDTH; |
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305 | unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1); |
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306 | if (x >= X_SIZE) _exit(); |
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307 | if (y >= Y_SIZE) _exit(); |
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308 | |
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309 | // This return value is not used / avoid a compilation warning. |
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310 | return _xcu_get_register(cluster_xy, XCU_PTI_ACK, pti_index); |
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311 | |
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312 | #else |
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313 | _printf("[GIET ERROR] in _xcu_timer_reset_irq() USE_XCU is not set\n"); |
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314 | _exit(); |
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315 | return 0; |
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316 | #endif |
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317 | } |
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318 | |
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319 | ////////////////////////////////////////////////////////////////////////////// |
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320 | // This function resets a timer counter. To do so, we re-write the period |
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321 | // in the proper register, what causes the count to restart. |
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322 | // The period value is read from the same (TIMER_PERIOD) register, |
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323 | // this is why in appearance we do nothing useful (read a value |
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324 | // from a register and write this value in the same register). |
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325 | // This function is called during a context switch (user or preemptive) |
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326 | ///////////////////////////////////////////////////////////////////////////// |
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327 | void _xcu_timer_reset_cpt( unsigned int cluster_xy, |
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328 | unsigned int pti_index ) |
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329 | { |
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330 | #if USE_XCU |
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331 | // parameters checking |
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332 | unsigned int x = cluster_xy >> Y_WIDTH; |
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333 | unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1); |
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334 | if (x >= X_SIZE) _exit(); |
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335 | if (y >= Y_SIZE) _exit(); |
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336 | |
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337 | unsigned int per = _xcu_get_register(cluster_xy, XCU_PTI_PER, pti_index); |
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338 | |
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339 | // we write 0 first because if the timer is currently running, |
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340 | // the corresponding timer counter is not reset |
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341 | _xcu_set_register(cluster_xy, XCU_PTI_PER, pti_index, 0); |
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342 | _xcu_set_register(cluster_xy, XCU_PTI_PER, pti_index, per); |
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343 | |
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344 | #else |
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345 | _printf("[GIET ERROR] in _xcu_timer_reset_cpt() USE_XCU is not set\n"); |
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346 | _exit(); |
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347 | #endif |
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348 | } |
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349 | |
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350 | |
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351 | // Local Variables: |
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352 | // tab-width: 4 |
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353 | // c-basic-offset: 4 |
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354 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
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355 | // indent-tabs-mode: nil |
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356 | // End: |
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357 | // vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
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358 | |
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