1 | /////////////////////////////////////////////////////////////////////////////////// |
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2 | // File : drivers.c |
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3 | // Date : 01/04/2012 |
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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 | // The drivers.c and drivers.h files are part ot the GIET nano kernel. |
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8 | // They contains the drivers for the peripherals available in the SoCLib library: |
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9 | // - vci_multi_tty |
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10 | // - vci_multi_timer |
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11 | // - vci_multi_dma |
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12 | // - vci_multi_icu |
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13 | // - vci_gcd |
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14 | // - vci_frame_buffer |
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15 | // - vci_block_device |
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16 | // |
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17 | // The following global parameters must be defined in the giet_config.h file: |
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18 | // - NB_CLUSTERS : number of clusters |
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19 | // - NB_PROCS : number of PROCS per cluster |
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20 | // - NB_TIMERS : number of TIMERS per cluster |
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21 | // - NB_DMAS : number of DMA channels |
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22 | // - NB_TTYS : number of TTY terminals |
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23 | // - NB_TIMERS : number of TIMERS per cluster |
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24 | // - CLUSTER_SPAN : address increment between clusters |
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25 | // |
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26 | // The following base addresses must be defined in the sys.ld file: |
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27 | // - seg_icu_base |
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28 | // - seg_timer_base |
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29 | // - seg_tty_base |
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30 | // - seg_gcd_base |
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31 | // - seg_dma_base |
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32 | // - seg_fb_base |
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33 | // - seg_ioc_base |
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34 | /////////////////////////////////////////////////////////////////////////////////// |
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35 | |
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36 | #include <sys_handler.h> |
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37 | #include <giet_config.h> |
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38 | #include <drivers.h> |
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39 | #include <common.h> |
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40 | #include <hwr_mapping.h> |
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41 | #include <mips32_registers.h> |
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42 | #include <ctx_handler.h> |
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43 | |
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44 | #if !defined(NB_PROCS) |
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45 | # error: You must define NB_PROCS in 'giet_config.h' file! |
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46 | #endif |
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47 | #if !defined(NB_CLUSTERS) |
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48 | # error: You must define NB_CLUSTERS in 'giet_config.h' file! |
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49 | #endif |
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50 | #if !defined(CLUSTER_SPAN) |
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51 | # error: You must define CLUSTER_SPAN in 'giet_config.h' file! |
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52 | #endif |
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53 | #if !defined(NB_TTYS) |
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54 | # error: You must define NB_TTYS in 'giet_config.h' file! |
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55 | #endif |
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56 | #if !defined(NB_DMAS) |
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57 | # error: You must define NB_DMAS in 'giet_config.h' file! |
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58 | #endif |
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59 | #if !defined(NB_TIMERS) |
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60 | # error: You must define NB_TIMERS in 'giet_config.h' file! |
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61 | #endif |
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62 | |
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63 | #if (NB_TTYS < 1) |
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64 | # error: NB_TTYS cannot be smaller than 1! |
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65 | #endif |
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66 | |
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67 | #if (NB_TIMERS < NB_PROCS) |
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68 | # error: NB_TIMERS must be larger or equal to NB_PROCS! |
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69 | #endif |
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70 | |
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71 | #if (NB_PROCS > 8) |
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72 | # error: NB_PROCS cannot be larger than 8! |
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73 | #endif |
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74 | |
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75 | #if (NB_DMAS < 1) |
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76 | # error: NB_DMAS cannot be 0! |
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77 | #endif |
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78 | |
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79 | |
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80 | ///////////////////////////////////////////////////////////////////////////// |
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81 | // Global (uncachable) variables |
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82 | ///////////////////////////////////////////////////////////////////////////// |
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83 | |
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84 | #define in_unckdata __attribute__((section (".unckdata"))) |
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85 | |
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86 | in_unckdata volatile unsigned int _dma_status[NB_DMAS]; |
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87 | in_unckdata volatile unsigned char _dma_busy[NB_DMAS] = { [0 ... NB_DMAS-1] = 0 }; |
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88 | |
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89 | in_unckdata volatile unsigned char _ioc_status; |
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90 | in_unckdata volatile unsigned char _ioc_done = 0; |
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91 | in_unckdata volatile unsigned int _ioc_lock = 0; |
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92 | |
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93 | in_unckdata volatile unsigned char _tty_get_buf[NB_TTYS]; |
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94 | in_unckdata volatile unsigned char _tty_get_full[NB_TTYS] = { [0 ... NB_TTYS-1] = 0 }; |
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95 | in_unckdata unsigned int _tty_put_lock; |
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96 | |
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97 | ////////////////////////////////////////////////////////////////////////////// |
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98 | // VciMultiTimer driver |
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99 | ////////////////////////////////////////////////////////////////////////////// |
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100 | // There is one MULTI-TIMER component per cluster. |
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101 | // The number of timers per cluster must be larger or equal to the number |
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102 | // processors (NB_TIMERS >= NB_PROCS), because each processor uses a private |
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103 | // yimer for context switch. |
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104 | // The total number of timers is NB_CLUSTERS * NB_TIMERS |
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105 | // The global timer index = cluster_id*NB_TIMERS + timer_id |
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106 | ////////////////////////////////////////////////////////////////////////////// |
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107 | |
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108 | ////////////////////////////////////////////////////////////////////////////// |
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109 | // _timer_write() |
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110 | // |
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111 | // Write a 32-bit word in a memory mapped register of a timer device, |
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112 | // identified by the cluster index and the local timer index. |
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113 | // Returns 0 if success, > 0 if error. |
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114 | ////////////////////////////////////////////////////////////////////////////// |
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115 | unsigned int _timer_write( unsigned int cluster_index, |
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116 | unsigned int timer_index, |
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117 | unsigned int register_index, |
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118 | unsigned int value ) |
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119 | { |
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120 | unsigned int* timer_address; |
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121 | |
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122 | // parameters checking |
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123 | if ( register_index >= TIMER_SPAN) return 1; |
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124 | if ( cluster_index >= NB_CLUSTERS) return 1; |
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125 | if ( timer_index >= NB_TIMERS ) return 1; |
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126 | |
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127 | timer_address = (unsigned int*)&seg_timer_base + |
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128 | ( cluster_index * CLUSTER_SPAN ) + |
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129 | ( timer_index * TIMER_SPAN ); |
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130 | |
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131 | timer_address[register_index] = value; // write word |
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132 | |
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133 | return 0; |
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134 | } |
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135 | |
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136 | ////////////////////////////////////////////////////////////////////////////// |
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137 | // _timer_read() |
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138 | // |
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139 | // Read a 32-bit word in a memory mapped register of a timer device, |
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140 | // identified by the cluster index and the local timer index. |
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141 | // Returns 0 if success, > 0 if error. |
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142 | ////////////////////////////////////////////////////////////////////////////// |
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143 | unsigned int _timer_read(unsigned int cluster_index, |
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144 | unsigned int timer_index, |
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145 | unsigned int register_index, |
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146 | unsigned int *buffer) |
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147 | { |
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148 | unsigned int *timer_address; |
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149 | |
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150 | // parameters checking |
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151 | if ( register_index >= TIMER_SPAN) return 1; |
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152 | if ( cluster_index >= NB_CLUSTERS) return 1; |
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153 | if ( timer_index >= NB_TIMERS ) return 1; |
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154 | |
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155 | timer_address = (unsigned int*)&seg_timer_base + |
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156 | ( cluster_index * CLUSTER_SPAN ) + |
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157 | ( timer_index * TIMER_SPAN ); |
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158 | |
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159 | *buffer = timer_address[register_index]; // read word |
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160 | |
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161 | return 0; |
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162 | } |
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163 | |
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164 | ///////////////////////////////////////////////////////////////////////////////// |
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165 | // VciMultiTty driver |
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166 | ///////////////////////////////////////////////////////////////////////////////// |
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167 | // The total number of TTYs is defined by the configuration parameter NB_TTYS. |
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168 | // The system terminal is TTY[0]. |
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169 | // The TTYs are allocated to applications by the GIET in the boot phase. |
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170 | // The nummber of TTYs allocated to each application, and used by each |
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171 | // task can be defined in the mapping_info data structure. |
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172 | // For each user task, the tty_id is stored in the context of the task (slot 34), |
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173 | // and must be explicitely defined in the boot code. |
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174 | // The TTY address is always computed as : seg_tty_base + tty_id*TTY_SPAN |
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175 | /////////////////////////////////////////////////////////////////////////////////// |
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176 | |
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177 | ////////////////////////////////////////////////////////////////////////////// |
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178 | // _tty_write() |
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179 | // |
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180 | // Write one or several characters directly from a fixed-length user buffer to |
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181 | // the TTY_WRITE register of the TTY controler. |
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182 | // It doesn't use the TTY_PUT_IRQ interrupt and the associated kernel buffer. |
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183 | // This is a non blocking call: it tests the TTY_STATUS register, and stops |
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184 | // the transfer as soon as the TTY_STATUS[WRITE] bit is set. |
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185 | // The function returns the number of characters that have been written. |
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186 | ////////////////////////////////////////////////////////////////////////////// |
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187 | unsigned int _tty_write( const char *buffer, |
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188 | unsigned int length) |
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189 | { |
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190 | volatile unsigned int *tty_address; |
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191 | |
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192 | unsigned int proc_id; |
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193 | unsigned int task_id; |
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194 | unsigned int tty_id; |
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195 | unsigned int nwritten; |
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196 | |
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197 | proc_id = _procid(); |
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198 | |
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199 | task_id = _scheduler[proc_id].current; |
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200 | tty_id = _scheduler[proc_id].context[task_id][CTX_TTY_ID]; |
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201 | |
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202 | tty_address = (unsigned int*)&seg_tty_base + tty_id*TTY_SPAN; |
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203 | |
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204 | for (nwritten = 0; nwritten < length; nwritten++) |
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205 | { |
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206 | // check tty's status |
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207 | if ((tty_address[TTY_STATUS] & 0x2) == 0x2) |
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208 | break; |
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209 | else |
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210 | // write character |
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211 | tty_address[TTY_WRITE] = (unsigned int)buffer[nwritten]; |
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212 | } |
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213 | return nwritten; |
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214 | } |
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215 | |
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216 | ////////////////////////////////////////////////////////////////////////////// |
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217 | // _tty_read_irq() |
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218 | // |
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219 | // This non-blocking function uses the TTY_GET_IRQ[tty_id] interrupt and |
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220 | // the associated kernel buffer, that has been written by the ISR. |
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221 | // It fetches one single character from the _tty_get_buf[tty_id] kernel |
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222 | // buffer, writes this character to the user buffer, and resets the |
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223 | // _tty_get_full[tty_id] buffer. |
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224 | // Returns 0 if the kernel buffer is empty, 1 if the buffer is full. |
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225 | ////////////////////////////////////////////////////////////////////////////// |
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226 | unsigned int _tty_read_irq( char *buffer, |
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227 | unsigned int length) |
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228 | { |
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229 | unsigned int proc_id; |
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230 | unsigned int task_id; |
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231 | unsigned int tty_id; |
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232 | unsigned int ret; |
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233 | |
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234 | proc_id = _procid(); |
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235 | task_id = _scheduler[proc_id].current; |
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236 | tty_id = _scheduler[proc_id].context[task_id][CTX_TTY_ID]; |
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237 | |
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238 | if (_tty_get_full[tty_id] == 0) |
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239 | { |
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240 | ret = 0; |
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241 | } |
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242 | else |
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243 | { |
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244 | *buffer = _tty_get_buf[tty_id]; |
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245 | _tty_get_full[tty_id] = 0; |
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246 | ret = 1; |
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247 | } |
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248 | return ret; |
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249 | } |
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250 | |
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251 | //////////////////////////////////////////////////////////////////////////////// |
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252 | // _tty_read() |
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253 | // |
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254 | // This non-blocking function fetches one character directly from the TTY_READ |
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255 | // register of the TTY controler, and writes this character to the user buffer. |
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256 | // It doesn't use the TTY_GET_IRQ interrupt and the associated kernel buffer. |
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257 | // Returns 0 if the register is empty, 1 if the register is full. |
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258 | //////////////////////////////////////////////////////////////////////////////// |
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259 | unsigned int _tty_read( char *buffer, |
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260 | unsigned int length) |
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261 | { |
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262 | volatile unsigned int *tty_address; |
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263 | |
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264 | unsigned int proc_id; |
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265 | unsigned int task_id; |
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266 | unsigned int tty_id; |
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267 | |
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268 | proc_id = _procid(); |
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269 | task_id = _scheduler[proc_id].current; |
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270 | tty_id = _scheduler[proc_id].context[task_id][CTX_TTY_ID]; |
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271 | |
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272 | tty_address = (unsigned int*)&seg_tty_base + tty_id*TTY_SPAN; |
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273 | |
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274 | if ((tty_address[TTY_STATUS] & 0x1) != 0x1) return 0; |
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275 | |
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276 | *buffer = (char)tty_address[TTY_READ]; |
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277 | return 1; |
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278 | } |
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279 | |
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280 | //////////////////////////////////////////////////////////////////////////////// |
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281 | // VciMultiIcu driver |
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282 | //////////////////////////////////////////////////////////////////////////////// |
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283 | // There is in principle one MULTI-ICU component per cluster, and the |
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284 | // number of independant ICUs is equal to NB_PROCS, because there is |
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285 | // one ICU per processor. |
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286 | //////////////////////////////////////////////////////////////////////////////// |
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287 | |
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288 | //////////////////////////////////////////////////////////////////////////////// |
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289 | // _icu_write() |
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290 | // |
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291 | // Write a 32-bit word in a memory mapped register of the MULTI_ICU device, |
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292 | // identified by the cluster index, and a processor local index. |
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293 | // Returns 0 if success, > 0 if error. |
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294 | //////////////////////////////////////////////////////////////////////////////// |
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295 | unsigned int _icu_write( unsigned int cluster_index, |
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296 | unsigned int proc_index, |
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297 | unsigned int register_index, |
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298 | unsigned int value ) |
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299 | { |
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300 | unsigned int *icu_address; |
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301 | |
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302 | // parameters checking |
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303 | if ( register_index >= ICU_SPAN) return 1; |
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304 | if ( cluster_index >= NB_CLUSTERS) return 1; |
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305 | if ( proc_index >= NB_PROCS ) return 1; |
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306 | |
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307 | icu_address = (unsigned int*)&seg_icu_base + |
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308 | ( cluster_index * CLUSTER_SPAN ) + |
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309 | ( proc_index * ICU_SPAN ); |
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310 | |
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311 | icu_address[register_index] = value; // write word |
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312 | return 0; |
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313 | } |
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314 | |
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315 | //////////////////////////////////////////////////////////////////////////////// |
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316 | // _icu_read() |
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317 | // |
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318 | // Read a 32-bit word in a memory mapped register of the MULTI_ICU device, |
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319 | // identified by the cluster index and a processor local index. |
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320 | // Returns 0 if success, > 0 if error. |
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321 | //////////////////////////////////////////////////////////////////////////////// |
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322 | unsigned int _icu_read( unsigned int cluster_index, |
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323 | unsigned int proc_index, |
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324 | unsigned int register_index, |
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325 | unsigned int* buffer ) |
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326 | { |
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327 | unsigned int *icu_address; |
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328 | |
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329 | // parameters checking |
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330 | if ( register_index >= ICU_SPAN) return 1; |
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331 | if ( cluster_index >= NB_CLUSTERS) return 1; |
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332 | if ( proc_index >= NB_PROCS ) return 1; |
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333 | |
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334 | icu_address = (unsigned int*)&seg_icu_base + |
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335 | ( cluster_index * CLUSTER_SPAN ) + |
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336 | ( proc_index * ICU_SPAN ); |
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337 | |
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338 | *buffer = icu_address[register_index]; // read word |
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339 | return 0; |
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340 | } |
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341 | |
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342 | //////////////////////////////////////////////////////////////////////////////// |
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343 | // VciGcd driver |
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344 | //////////////////////////////////////////////////////////////////////////////// |
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345 | // The Greater Dommon Divider is a -very- simple hardware coprocessor |
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346 | // performing the computation of the GCD of two 32 bits integers. |
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347 | // It has no DMA capability. |
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348 | //////////////////////////////////////////////////////////////////////////////// |
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349 | |
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350 | //////////////////////////////////////////////////////////////////////////////// |
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351 | // _gcd_write() |
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352 | // |
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353 | // Write a 32-bit word in a memory mapped register of the GCD coprocessor. |
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354 | // Returns 0 if success, > 0 if error. |
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355 | //////////////////////////////////////////////////////////////////////////////// |
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356 | unsigned int _gcd_write( unsigned int register_index, |
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357 | unsigned int value) |
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358 | { |
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359 | volatile unsigned int *gcd_address; |
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360 | |
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361 | // parameters checking |
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362 | if (register_index >= GCD_END) |
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363 | return 1; |
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364 | |
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365 | gcd_address = (unsigned int*)&seg_gcd_base; |
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366 | |
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367 | gcd_address[register_index] = value; // write word |
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368 | return 0; |
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369 | } |
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370 | |
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371 | //////////////////////////////////////////////////////////////////////////////// |
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372 | // _gcd_read() |
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373 | // |
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374 | // Read a 32-bit word in a memory mapped register of the GCD coprocessor. |
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375 | // Returns 0 if success, > 0 if error. |
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376 | //////////////////////////////////////////////////////////////////////////////// |
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377 | unsigned int _gcd_read( unsigned int register_index, |
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378 | unsigned int *buffer) |
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379 | { |
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380 | volatile unsigned int *gcd_address; |
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381 | |
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382 | // parameters checking |
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383 | if (register_index >= GCD_END) |
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384 | return 1; |
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385 | |
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386 | gcd_address = (unsigned int*)&seg_gcd_base; |
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387 | |
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388 | *buffer = gcd_address[register_index]; // read word |
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389 | return 0; |
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390 | } |
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391 | |
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392 | //////////////////////////////////////////////////////////////////////////////// |
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393 | // VciBlockDevice driver |
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394 | //////////////////////////////////////////////////////////////////////////////// |
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395 | // The VciBlockDevice is a single channel external storage contrÃŽler. |
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396 | // The three functions below use the three variables _ioc_lock _ioc_done, and |
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397 | // _ioc_status for synchronisation. |
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398 | // As the IOC component can be used by several programs running in parallel, |
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399 | // the _ioc_lock variable guaranties exclusive access to the device. The |
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400 | // _ioc_read() and _ioc_write() functions use atomic LL/SC to get the lock. |
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401 | // and set _ioc_lock to a non zero value. The _ioc_write() and _ioc_read() |
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402 | // functions are blocking, polling the _ioc_lock variable until the device is |
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403 | // available. |
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404 | // When the tranfer is completed, the ISR routine activated by the IOC IRQ |
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405 | // set the _ioc_done variable to a non-zero value. Possible address errors |
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406 | // detected by the IOC peripheral are reported by the ISR in the _ioc_status |
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407 | // variable. |
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408 | // The _ioc_completed() function is polling the _ioc_done variable, waiting for |
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409 | // tranfer conpletion. When the completion is signaled, the _ioc_completed() |
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410 | // function reset the _ioc_done variable to zero, and releases the _ioc_lock |
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411 | // variable. |
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412 | // |
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413 | // In a multi-processing environment, this polling policy should be replaced by |
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414 | // a descheduling policy for the requesting process. |
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415 | /////////////////////////////////////////////////////////////////////////////// |
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416 | |
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417 | /////////////////////////////////////////////////////////////////////////////// |
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418 | // _ioc_get_lock() |
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419 | // |
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420 | // This blocking helper is used by '_ioc_read()' and '_ioc_write()' functions |
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421 | // to get _ioc_lock using atomic LL/SC. |
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422 | /////////////////////////////////////////////////////////////////////////////// |
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423 | static inline void _ioc_get_lock() |
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424 | { |
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425 | register unsigned int delay = (_proctime() & 0xF) << 4; |
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426 | register unsigned int *plock = (unsigned int*)&_ioc_lock; |
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427 | |
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428 | asm volatile ( |
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429 | "_ioc_llsc: \n" |
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430 | "ll $2, 0(%0) \n" /* $2 <= _ioc_lock current value */ |
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431 | "bnez $2, _ioc_delay \n" /* delay if _ioc_lock already taken */ |
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432 | "li $3, 1 \n" /* $3 <= argument for sc */ |
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433 | "sc $3, 0(%0) \n" /* try to set _ioc_lock */ |
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434 | "bnez $3, _ioc_ok \n" /* exit if atomic */ |
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435 | "_ioc_delay: \n" |
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436 | "move $4, %1 \n" /* $4 <= delay */ |
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437 | "_ioc_loop: \n" |
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438 | "beqz $4, _ioc_loop \n" /* test end delay */ |
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439 | "addi $4, $4, -1 \n" /* $4 <= $4 - 1 */ |
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440 | "j _ioc_llsc \n" /* retry ll */ |
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441 | "nop \n" |
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442 | "_ioc_ok: \n" |
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443 | : |
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444 | :"r"(plock), "r"(delay) |
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445 | :"$2", "$3", "$4"); |
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446 | } |
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447 | |
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448 | /////////////////////////////////////////////////////////////////////////////// |
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449 | // _ioc_write() |
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450 | // |
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451 | // Transfer data from a memory buffer to a file on the block_device. |
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452 | // The source memory buffer must be in user address space. |
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453 | // - lba : first block index on the disk. |
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454 | // - buffer : base address of the memory buffer. |
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455 | // - count : number of blocks to be transfered. |
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456 | // Returns 0 if success, > 0 if error. |
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457 | /////////////////////////////////////////////////////////////////////////////// |
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458 | unsigned int _ioc_write( unsigned int lba, |
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459 | const void* buffer, |
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460 | unsigned int count) |
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461 | { |
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462 | volatile unsigned int *ioc_address; |
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463 | |
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464 | ioc_address = (unsigned int*)&seg_ioc_base; |
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465 | |
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466 | /* buffer must be in user space */ |
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467 | unsigned int block_size = ioc_address[BLOCK_DEVICE_BLOCK_SIZE]; |
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468 | |
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469 | if (((unsigned int)buffer >= 0x80000000) |
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470 | || (((unsigned int)buffer + block_size*count) >= 0x80000000)) |
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471 | return 1; |
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472 | |
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473 | /* get the lock on ioc device */ |
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474 | _ioc_get_lock(); |
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475 | |
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476 | /* block_device configuration for the write transfer */ |
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477 | ioc_address[BLOCK_DEVICE_BUFFER] = (unsigned int)buffer; |
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478 | ioc_address[BLOCK_DEVICE_COUNT] = count; |
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479 | ioc_address[BLOCK_DEVICE_LBA] = lba; |
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480 | ioc_address[BLOCK_DEVICE_IRQ_ENABLE] = 1; |
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481 | ioc_address[BLOCK_DEVICE_OP] = BLOCK_DEVICE_WRITE; |
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482 | |
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483 | return 0; |
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484 | } |
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485 | |
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486 | /////////////////////////////////////////////////////////////////////////////// |
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487 | // _ioc_read() |
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488 | // |
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489 | // Transfer data from a file on the block device to a memory buffer. |
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490 | // The destination memory buffer must be in user address space. |
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491 | // - lba : first block index on the disk. |
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492 | // - buffer : base address of the memory buffer. |
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493 | // - count : number of blocks to be transfered. |
---|
494 | // All cache lines corresponding to the the target buffer are invalidated |
---|
495 | // for cache coherence. |
---|
496 | // Returns 0 if success, > 0 if error. |
---|
497 | /////////////////////////////////////////////////////////////////////////////// |
---|
498 | unsigned int _ioc_read( unsigned int lba, |
---|
499 | void* buffer, |
---|
500 | unsigned int count ) |
---|
501 | { |
---|
502 | volatile unsigned int *ioc_address; |
---|
503 | |
---|
504 | ioc_address = (unsigned int*)&seg_ioc_base; |
---|
505 | |
---|
506 | /* buffer must be in user space */ |
---|
507 | unsigned int block_size = ioc_address[BLOCK_DEVICE_BLOCK_SIZE]; |
---|
508 | |
---|
509 | if (((unsigned int)buffer >= 0x80000000) |
---|
510 | || (((unsigned int)buffer + block_size*count) >= 0x80000000)) |
---|
511 | return 1; |
---|
512 | |
---|
513 | /* get the lock on ioc device */ |
---|
514 | _ioc_get_lock(); |
---|
515 | |
---|
516 | /* block_device configuration for the read transfer */ |
---|
517 | ioc_address[BLOCK_DEVICE_BUFFER] = (unsigned int)buffer; |
---|
518 | ioc_address[BLOCK_DEVICE_COUNT] = count; |
---|
519 | ioc_address[BLOCK_DEVICE_LBA] = lba; |
---|
520 | ioc_address[BLOCK_DEVICE_IRQ_ENABLE] = 1; |
---|
521 | ioc_address[BLOCK_DEVICE_OP] = BLOCK_DEVICE_READ; |
---|
522 | |
---|
523 | /* invalidation of data cache */ |
---|
524 | _dcache_buf_invalidate(buffer, block_size*count); |
---|
525 | |
---|
526 | return 0; |
---|
527 | } |
---|
528 | |
---|
529 | ///////////////////////////////////////////////////////////////////////////////// |
---|
530 | // _ioc_completed() |
---|
531 | // |
---|
532 | // This function checks completion of an I/O transfer and reports errors. |
---|
533 | // As it is a blocking call, the processor is stalled until the next interrupt. |
---|
534 | // Returns 0 if success, > 0 if error. |
---|
535 | ///////////////////////////////////////////////////////////////////////////////// |
---|
536 | unsigned int _ioc_completed() |
---|
537 | { |
---|
538 | unsigned int ret; |
---|
539 | |
---|
540 | /* busy waiting */ |
---|
541 | while (_ioc_done == 0) |
---|
542 | asm volatile("nop"); |
---|
543 | |
---|
544 | /* test IOC status */ |
---|
545 | if ((_ioc_status != BLOCK_DEVICE_READ_SUCCESS) |
---|
546 | && (_ioc_status != BLOCK_DEVICE_WRITE_SUCCESS)) ret = 1; /* error */ |
---|
547 | else ret = 0; /* success */ |
---|
548 | |
---|
549 | /* reset synchronization variables */ |
---|
550 | _ioc_lock =0; |
---|
551 | _ioc_done =0; |
---|
552 | |
---|
553 | return ret; |
---|
554 | } |
---|
555 | |
---|
556 | ////////////////////////////////////////////////////////////////////////////////// |
---|
557 | // VciFrameBuffer driver |
---|
558 | ////////////////////////////////////////////////////////////////////////////////// |
---|
559 | // The '_fb_sync_write' and '_fb_sync_read' functions use a memcpy strategy to |
---|
560 | // implement the transfer between a data buffer (user space) and the frame |
---|
561 | // buffer (kernel space). They are blocking until completion of the transfer. |
---|
562 | // The '_fb_write()', '_fb_read()' and '_fb_completed()' functions use the DMA |
---|
563 | // coprocessor to transfer data between the user buffer and the frame buffer. |
---|
564 | // These functions use a polling policy to test the global variables _dma_busy[i] |
---|
565 | // and detect the transfer completion. |
---|
566 | // There is NB_PROCS DMA channels, that are indexed by the proc_id. |
---|
567 | // The _dma_busy[i] synchronisation variables (one per channel) are set by the OS, |
---|
568 | // and reset by the ISR. |
---|
569 | ////////////////////////////////////////////////////////////////////////////////// |
---|
570 | |
---|
571 | ////////////////////////////////////////////////////////////////////////////////// |
---|
572 | // _fb_sync_write() |
---|
573 | // Transfer data from an memory buffer to the frame_buffer device using |
---|
574 | // a memcpy. The source memory buffer must be in user address space. |
---|
575 | // - offset : offset (in bytes) in the frame buffer. |
---|
576 | // - buffer : base address of the memory buffer. |
---|
577 | // - length : number of bytes to be transfered. |
---|
578 | // Returns 0 if success, > 0 if error. |
---|
579 | ////////////////////////////////////////////////////////////////////////////////// |
---|
580 | unsigned int _fb_sync_write( unsigned int offset, |
---|
581 | const void* buffer, |
---|
582 | unsigned int length ) |
---|
583 | { |
---|
584 | volatile unsigned char *fb_address; |
---|
585 | |
---|
586 | /* buffer must be in user space */ |
---|
587 | if (((unsigned int)buffer >= 0x80000000) |
---|
588 | || (((unsigned int)buffer + length ) >= 0x80000000 )) |
---|
589 | return 1; |
---|
590 | |
---|
591 | fb_address = (unsigned char*)&seg_fb_base + offset; |
---|
592 | |
---|
593 | /* buffer copy */ |
---|
594 | memcpy((void*)fb_address, (void*)buffer, length); |
---|
595 | |
---|
596 | return 0; |
---|
597 | } |
---|
598 | |
---|
599 | ////////////////////////////////////////////////////////////////////////////////// |
---|
600 | // _fb_sync_read() |
---|
601 | // Transfer data from the frame_buffer device to a memory buffer using |
---|
602 | // a memcpy. The destination memory buffer must be in user address space. |
---|
603 | // - offset : offset (in bytes) in the frame buffer. |
---|
604 | // - buffer : base address of the memory buffer. |
---|
605 | // - length : number of bytes to be transfered. |
---|
606 | // Returns 0 if success, > 0 if error. |
---|
607 | ////////////////////////////////////////////////////////////////////////////////// |
---|
608 | unsigned int _fb_sync_read( unsigned int offset, |
---|
609 | const void* buffer, |
---|
610 | unsigned int length ) |
---|
611 | { |
---|
612 | volatile unsigned char *fb_address; |
---|
613 | |
---|
614 | /* parameters checking */ |
---|
615 | /* buffer must be in user space */ |
---|
616 | if (((unsigned int)buffer >= 0x80000000) |
---|
617 | || (((unsigned int)buffer + length ) >= 0x80000000 )) |
---|
618 | return 1; |
---|
619 | |
---|
620 | fb_address = (unsigned char*)&seg_fb_base + offset; |
---|
621 | |
---|
622 | /* buffer copy */ |
---|
623 | memcpy((void*)buffer, (void*)fb_address, length); |
---|
624 | |
---|
625 | return 0; |
---|
626 | } |
---|
627 | |
---|
628 | ////////////////////////////////////////////////////////////////////////////////// |
---|
629 | // _fb_write() |
---|
630 | // Transfer data from an memory buffer to the frame_buffer device using a DMA. |
---|
631 | // The source memory buffer must be in user address space. |
---|
632 | // - offset : offset (in bytes) in the frame buffer. |
---|
633 | // - buffer : base address of the memory buffer. |
---|
634 | // - length : number of bytes to be transfered. |
---|
635 | // Returns 0 if success, > 0 if error. |
---|
636 | ////////////////////////////////////////////////////////////////////////////////// |
---|
637 | unsigned int _fb_write( unsigned int offset, |
---|
638 | const void* buffer, |
---|
639 | unsigned int length ) |
---|
640 | { |
---|
641 | volatile unsigned char *fb_address; |
---|
642 | volatile unsigned int *dma; |
---|
643 | |
---|
644 | unsigned int proc_id; |
---|
645 | unsigned int delay; |
---|
646 | unsigned int i; |
---|
647 | |
---|
648 | /* buffer must be in user space */ |
---|
649 | if (((unsigned int)buffer >= 0x80000000) |
---|
650 | || (((unsigned int)buffer + length ) >= 0x80000000 )) |
---|
651 | return 1; |
---|
652 | |
---|
653 | proc_id = _procid(); |
---|
654 | fb_address = (unsigned char*)&seg_fb_base + offset; |
---|
655 | dma = (unsigned int*)&seg_dma_base + (proc_id * DMA_SPAN); |
---|
656 | |
---|
657 | /* waiting until DMA device is available */ |
---|
658 | while (_dma_busy[proc_id] != 0) |
---|
659 | { |
---|
660 | /* if the lock failed, busy wait with a pseudo random delay between bus |
---|
661 | * accesses */ |
---|
662 | delay = (_proctime() & 0xF) << 4; |
---|
663 | for (i = 0; i < delay; i++) |
---|
664 | asm volatile("nop"); |
---|
665 | } |
---|
666 | _dma_busy[proc_id] = 1; |
---|
667 | |
---|
668 | /* DMA configuration for write transfer */ |
---|
669 | dma[DMA_IRQ_DISABLE] = 0; |
---|
670 | dma[DMA_SRC] = (unsigned int)buffer; |
---|
671 | dma[DMA_DST] = (unsigned int)fb_address; |
---|
672 | dma[DMA_LEN] = (unsigned int)length; |
---|
673 | return 0; |
---|
674 | } |
---|
675 | |
---|
676 | ////////////////////////////////////////////////////////////////////////////////// |
---|
677 | // _fb_read() |
---|
678 | // Transfer data from the frame_buffer device to an memory buffer using a DMA. |
---|
679 | // The destination memory buffer must be in user address space. |
---|
680 | // - offset : offset (in bytes) in the frame buffer. |
---|
681 | // - buffer : base address of the memory buffer. |
---|
682 | // - length : number of bytes to be transfered. |
---|
683 | // All cache lines corresponding to the the target buffer are invalidated |
---|
684 | // for cache coherence. |
---|
685 | // Returns 0 if success, > 0 if error. |
---|
686 | ////////////////////////////////////////////////////////////////////////////////// |
---|
687 | unsigned int _fb_read( unsigned int offset, |
---|
688 | const void* buffer, |
---|
689 | unsigned int length ) |
---|
690 | { |
---|
691 | volatile unsigned char *fb_address; |
---|
692 | volatile unsigned int *dma; |
---|
693 | |
---|
694 | unsigned int proc_id; |
---|
695 | unsigned int delay; |
---|
696 | unsigned int i; |
---|
697 | |
---|
698 | /* buffer must be in user space */ |
---|
699 | if (((unsigned int)buffer >= 0x80000000) |
---|
700 | || (((unsigned int)buffer + length ) >= 0x80000000 )) |
---|
701 | return 1; |
---|
702 | |
---|
703 | proc_id = _procid(); |
---|
704 | fb_address = (unsigned char*)&seg_fb_base + offset; |
---|
705 | dma = (unsigned int*)&seg_dma_base + (proc_id * DMA_SPAN); |
---|
706 | |
---|
707 | /* waiting until DMA device is available */ |
---|
708 | while (_dma_busy[proc_id] != 0) |
---|
709 | { |
---|
710 | /* if the lock failed, busy wait with a pseudo random delay between bus |
---|
711 | * accesses */ |
---|
712 | delay = (_proctime() & 0xF) << 4; |
---|
713 | for (i = 0; i < delay; i++) |
---|
714 | asm volatile("nop"); |
---|
715 | } |
---|
716 | _dma_busy[proc_id] = 1; |
---|
717 | |
---|
718 | /* DMA configuration for write transfer */ |
---|
719 | dma[DMA_IRQ_DISABLE] = 0; |
---|
720 | dma[DMA_SRC] = (unsigned int)fb_address; |
---|
721 | dma[DMA_DST] = (unsigned int)buffer; |
---|
722 | dma[DMA_LEN] = (unsigned int)length; |
---|
723 | |
---|
724 | /* invalidation of data cache */ |
---|
725 | _dcache_buf_invalidate(buffer, length); |
---|
726 | |
---|
727 | return 0; |
---|
728 | } |
---|
729 | |
---|
730 | ////////////////////////////////////////////////////////////////////////////////// |
---|
731 | // _fb_completed() |
---|
732 | // This function checks completion of a DMA transfer to or fom the frame buffer. |
---|
733 | // As it is a blocking call, the processor is stalled until the next interrupt. |
---|
734 | // Returns 0 if success, > 0 if error. |
---|
735 | ////////////////////////////////////////////////////////////////////////////////// |
---|
736 | unsigned int _fb_completed() |
---|
737 | { |
---|
738 | unsigned int proc_id; |
---|
739 | |
---|
740 | proc_id = _procid(); |
---|
741 | |
---|
742 | while (_dma_busy[proc_id] != 0) |
---|
743 | asm volatile("nop"); |
---|
744 | |
---|
745 | if (_dma_status[proc_id] != 0) |
---|
746 | return 1; |
---|
747 | |
---|
748 | return 0; |
---|
749 | } |
---|
750 | |
---|