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