1 | #include <ioc.h> |
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2 | #include <defs.h> |
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3 | |
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4 | #define in_reset __attribute__((section (".reset"))) |
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5 | #define in_reset_data __attribute__((section (".reset_data"))) |
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6 | #define in_unckdata __attribute__((section (".unckdata"))) |
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7 | |
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8 | in_unckdata int volatile _ioc_lock = 0; |
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9 | in_reset_data int volatile _ioc_done = 0; |
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10 | in_reset_data int volatile _ioc_status; |
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11 | |
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12 | #ifndef SOCLIB_IOC |
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13 | /*in_reset_data volatile unsigned int _ioc_init_ok = 0;*/ |
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14 | |
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15 | static in_reset_data struct sdcard_dev _sdcard_device; |
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16 | static in_reset_data struct spi_dev * _spi_device = ( struct spi_dev * )IOC_BASE; |
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17 | #endif |
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18 | |
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19 | ////////////////////////////////////////////////////////////////////////////////////////// |
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20 | // I/O BLOCK_DEVICE |
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21 | // The three functions below use the three variables _ioc_lock _ioc_done, |
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22 | // and _ioc_status for synchronsation. |
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23 | // - As the IOC component can be used by several programs running in parallel, |
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24 | // the _ioc_lock variable guaranties exclusive access to the device. |
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25 | // The _ioc_read() and _ioc_write() functions use atomic LL/SC to get the lock. |
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26 | // and set _ioc_lock to a non zero value. |
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27 | // The _ioc_write() and _ioc_read() functions are blocking, polling the _ioc_lock |
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28 | // variable until the device is available. |
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29 | // - When the tranfer is completed, the ISR routine activated by the IOC IRQ |
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30 | // set the _ioc_done variable to a non-zero value. Possible address errors detected |
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31 | // by the IOC peripheral are reported by the ISR in the _ioc_status variable. |
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32 | // The _ioc_completed() function is polling the _ioc_done variable, waiting for |
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33 | // tranfer conpletion. When the completion is signaled, the _ioc_completed() function |
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34 | // reset the _ioc_done variable to zero, and releases the _ioc_lock variable. |
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35 | // |
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36 | // In a multi-tasks environment, this polling policy must be replaced by a |
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37 | // descheduling policy for the requesting process. |
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38 | ////////////////////////////////////////////////////////////////////// |
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39 | |
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40 | ////////////////////////////////////////////////////////////////////// |
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41 | // _dcache_buf_invalidate() |
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42 | // Invalidate all cache lines corresponding to a memory buffer. |
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43 | // This is used by the block_device driver. |
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44 | ///////////////////////////////////////////////////////////////////////// |
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45 | //in_reset static void _dcache_buf_invalidate(const void * buffer, size_t size) |
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46 | //{ |
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47 | // size_t i; |
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48 | // size_t dcache_line_size; |
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49 | // |
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50 | // // retrieve dcache line size from config register (bits 12:10) |
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51 | // asm volatile("mfc0 %0, $16, 1" : "=r" (dcache_line_size)); |
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52 | // |
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53 | // dcache_line_size = 2 << ((dcache_line_size>>10) & 0x7); |
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54 | // |
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55 | // // iterate on lines to invalidate each one of them |
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56 | // for ( i=0; i<size; i+=dcache_line_size ) |
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57 | // asm volatile(" cache %0, %1" |
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58 | // : |
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59 | // :"i" (0x11), "R" (*((char*)buffer+i))); |
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60 | //} |
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61 | |
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62 | /////////////////////////////////////////////////////////////////////////////////////// |
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63 | // _ioc_get_lock() |
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64 | // This blocking function is used by the _ioc_read() and _ioc_write() functions |
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65 | // to get _ioc_lock using LL/SC. |
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66 | /////////////////////////////////////////////////////////////////////////////////////// |
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67 | in_reset void _ioc_get_lock() |
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68 | { |
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69 | register unsigned int proctime; |
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70 | register unsigned int delay; |
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71 | register unsigned int* plock = (unsigned int*)&_ioc_lock; |
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72 | |
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73 | asm volatile( |
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74 | "mfc0 %0, $9 \n" |
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75 | : "=r"(proctime) |
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76 | : /* No inputs */ |
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77 | ); |
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78 | |
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79 | delay = (proctime & 0xF) << 4; |
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80 | |
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81 | asm volatile ("_ioc_llsc: \n" |
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82 | "ll $2, 0(%0) \n" // $2 <= _ioc_lock |
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83 | "bnez $2, _ioc_delay \n" // random delay if busy |
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84 | "li $3, 1 \n" // prepare argument for sc |
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85 | "sc $3, 0(%0) \n" // try to set _ioc_busy |
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86 | "bnez $3, _ioc_ok \n" // exit if atomic |
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87 | "_ioc_delay: \n" |
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88 | "move $4, %1 \n" // $4 <= delay |
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89 | "_ioc_loop: \n" |
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90 | "addi $4, $4, -1 \n" // $4 <= $4 - 1 |
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91 | "beqz $4, _ioc_loop \n" // test end delay |
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92 | "j _ioc_llsc \n" // retry |
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93 | "_ioc_ok: \n" |
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94 | ::"r"(plock),"r"(delay):"$2","$3","$4"); |
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95 | } |
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96 | |
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97 | in_reset int _ioc_init() |
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98 | { |
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99 | #ifndef SOCLIB_IOC |
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100 | in_reset_data static char init_begin[] = "Initializing block device\n\r"; |
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101 | in_reset_data static char init_end[] = "Finish block device initialization\n\r"; |
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102 | |
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103 | unsigned char sdcard_rsp; |
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104 | |
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105 | boot_puts(init_begin); |
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106 | |
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107 | /** |
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108 | * Initializing the SPI controller |
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109 | */ |
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110 | spi_dev_config ( |
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111 | _spi_device , |
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112 | 200000 , /**< SPI_clk: 200 Khz */ |
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113 | 50000000 , /**< Sys_clk: 50 Mhz */ |
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114 | 8 , /**< Charlen: 8 */ |
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115 | SPI_TX_NEGEDGE, |
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116 | SPI_RX_POSEDGE |
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117 | ); |
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118 | |
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119 | /** |
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120 | * Initializing the SD Card |
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121 | */ |
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122 | if ( (sdcard_rsp = sdcard_dev_open(&_sdcard_device, _spi_device, 0)) ) |
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123 | return sdcard_rsp; |
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124 | |
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125 | if ( (sdcard_rsp = sdcard_dev_set_blocklen(&_sdcard_device, 512)) ) |
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126 | return sdcard_rsp; |
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127 | |
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128 | /** |
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129 | * Incrementing SDCARD clock frequency for normal function |
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130 | */ |
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131 | spi_dev_config ( |
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132 | _spi_device , |
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133 | 10000000 , /**< SPI_clkL 10 Mhz */ |
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134 | 50000000 , /**< Sys_clk: 50 Mhz */ |
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135 | -1 , /**< Charlen: 8 */ |
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136 | -1 , |
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137 | -1 |
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138 | ); |
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139 | |
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140 | boot_puts(init_end); |
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141 | #endif |
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142 | |
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143 | return 0; |
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144 | } |
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145 | |
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146 | /////////////////////////////////////////////////////////////////////////////////////// |
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147 | // _ioc_completed() |
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148 | // This blocking function cheks completion of an I/O transfer and reports errors. |
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149 | // It returns 0 if the transfer is successfully completed. |
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150 | // It returns -1 if an error has been reported. |
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151 | /////////////////////////////////////////////////////////////////////////////////////// |
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152 | in_reset int _ioc_completed() |
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153 | { |
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154 | unsigned int status = 0; |
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155 | |
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156 | #ifdef SOCLIB_IOC |
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157 | |
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158 | unsigned int * ioc_address = ( unsigned int * )VCIBD_BASE; |
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159 | |
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160 | while ( 1 ) |
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161 | { |
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162 | status = ioread32(&ioc_address[BLOCK_DEVICE_STATUS]); |
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163 | |
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164 | if (( status == BLOCK_DEVICE_READ_SUCCESS ) || |
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165 | ( status == BLOCK_DEVICE_READ_ERROR )) |
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166 | break; |
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167 | } |
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168 | |
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169 | #endif |
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170 | |
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171 | return status; |
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172 | } |
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173 | |
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174 | ////////////////////////////////////////////////////////////////////////////////////// |
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175 | // _ioc_write() |
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176 | // Transfer data from a memory buffer to a file on the block_device. |
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177 | // - lba : first block index on the disk |
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178 | // - buffer : base address of the memory buffer |
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179 | // - count : number of blocks to be transfered |
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180 | // The source buffer must be in user address space. |
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181 | /////////////////////////////////////////////////////////////////////////////////////// |
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182 | in_reset int _ioc_write(size_t lba, void* buffer, size_t count) |
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183 | { |
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184 | // get the lock |
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185 | // _ioc_get_lock(); |
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186 | |
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187 | #ifdef SOCLIB_IOC |
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188 | |
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189 | unsigned int * ioc_address = ( unsigned int * )VCIBD_BASE; |
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190 | |
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191 | // block_device configuration |
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192 | iowrite32( &ioc_address[BLOCK_DEVICE_BUFFER], |
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193 | ( unsigned int ) buffer ); |
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194 | |
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195 | iowrite32( &ioc_address[BLOCK_DEVICE_COUNT], |
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196 | ( unsigned int ) count ); |
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197 | |
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198 | iowrite32( &ioc_address[BLOCK_DEVICE_LBA], |
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199 | ( unsigned int ) lba ); |
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200 | |
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201 | iowrite32( &ioc_address[BLOCK_DEVICE_IRQ_ENABLE], |
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202 | ( unsigned int ) 0 ); |
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203 | |
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204 | iowrite32( &ioc_address[BLOCK_DEVICE_OP], |
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205 | ( unsigned int ) BLOCK_DEVICE_WRITE); |
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206 | |
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207 | _ioc_completed(); |
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208 | |
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209 | #else |
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210 | /* |
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211 | in_reset_data static char end_line[] = |
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212 | "\n\r"; |
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213 | in_reset_data static char error_init[] = |
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214 | "ERROR during initialization of block device. Code: "; |
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215 | |
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216 | unsigned int sdcard_rsp; |
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217 | |
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218 | if ( _ioc_init_ok == 0 ) |
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219 | { |
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220 | if (( sdcard_rsp = _ioc_init(&_sdcard_device, 0) )) |
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221 | { |
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222 | boot_puts(error_init); |
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223 | boot_putx(sdcard_rsp); |
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224 | boot_puts(end_line); |
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225 | } |
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226 | |
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227 | _ioc_init_ok = 1; |
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228 | } |
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229 | */ |
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230 | |
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231 | sdcard_dev_lseek(&_sdcard_device, lba); |
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232 | sdcard_dev_write(&_sdcard_device, buffer, count*512); |
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233 | |
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234 | #endif |
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235 | |
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236 | // _ioc_lock = 0; |
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237 | |
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238 | return 0; |
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239 | } |
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240 | |
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241 | /** |
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242 | * _ioc_read() |
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243 | * |
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244 | * Transfer data from a file on the block device to a memory buffer. |
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245 | * |
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246 | * \param lba : first block index on the disk |
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247 | * \param buffer : base address of the memory buffer |
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248 | * \param count : number of blocks to be transfered |
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249 | * |
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250 | * \note This is a blocking function. The function returns once the transfer |
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251 | * has finished |
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252 | */ |
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253 | in_reset int _ioc_read(size_t lba, void* buffer, size_t count) |
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254 | { |
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255 | // get the lock |
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256 | // _ioc_get_lock(); |
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257 | |
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258 | #ifdef SOCLIB_IOC |
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259 | |
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260 | unsigned int * ioc_address = (unsigned int*)VCIBD_BASE; |
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261 | |
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262 | // block_device configuration |
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263 | iowrite32( &ioc_address[BLOCK_DEVICE_BUFFER], |
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264 | ( unsigned int ) buffer ); |
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265 | |
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266 | iowrite32( &ioc_address[BLOCK_DEVICE_COUNT], |
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267 | ( unsigned int ) count ); |
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268 | |
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269 | iowrite32( &ioc_address[BLOCK_DEVICE_LBA], |
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270 | ( unsigned int ) lba ); |
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271 | |
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272 | iowrite32( &ioc_address[BLOCK_DEVICE_IRQ_ENABLE], |
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273 | ( unsigned int ) 0 ); |
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274 | |
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275 | iowrite32( &ioc_address[BLOCK_DEVICE_OP], |
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276 | ( unsigned int ) BLOCK_DEVICE_READ ); |
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277 | |
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278 | _ioc_completed(); |
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279 | |
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280 | #else |
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281 | in_reset_data static char error_read[] = |
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282 | "ERROR during read on the SDCARD device. Code: "; |
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283 | in_reset_data static char end_line[] = |
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284 | "\n\r"; |
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285 | /* |
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286 | in_reset_data static char error_init[] = |
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287 | "ERROR during initialization of block device. Code: "; |
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288 | */ |
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289 | |
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290 | unsigned int sdcard_rsp; |
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291 | |
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292 | /* |
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293 | if ( _ioc_init_ok == 0 ) |
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294 | { |
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295 | if (( sdcard_rsp = _ioc_init(&_sdcard_device, 0) )) |
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296 | { |
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297 | boot_puts(error_init); |
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298 | boot_putx(sdcard_rsp); |
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299 | boot_puts(end_line); |
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300 | } |
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301 | |
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302 | _ioc_init_ok = 1; |
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303 | } |
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304 | */ |
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305 | |
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306 | sdcard_dev_lseek(&_sdcard_device, lba); |
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307 | |
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308 | unsigned int i; |
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309 | for(i = 0; i < count; i++) |
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310 | { |
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311 | if (( sdcard_rsp = sdcard_dev_read ( |
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312 | &_sdcard_device, |
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313 | (unsigned char *) buffer + (512 * i), |
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314 | 512 |
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315 | ) |
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316 | )) |
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317 | { |
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318 | boot_puts(error_read); |
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319 | boot_putx(sdcard_rsp); |
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320 | boot_puts(end_line); |
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321 | |
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322 | return 1; |
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323 | } |
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324 | } |
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325 | |
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326 | #endif |
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327 | |
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328 | //_ioc_lock = 0; |
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329 | // |
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330 | //_dcache_buf_invalidate(buffer, count); |
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331 | |
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332 | return 0; |
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333 | } |
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334 | #undef in_reset |
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335 | #undef in_reset_data |
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336 | #undef in_unckdata |
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337 | |
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338 | /* |
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339 | * vim: tabstop=4 : shiftwidth=4 : expandtab |
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340 | */ |
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