1 | ////////////////////////////////////////////////////////////////////////////////// |
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2 | // File : hba_driver.c |
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3 | // Date : 23/11/2013 |
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4 | // Author : alain greiner |
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5 | // Copyright (c) UPMC-LIP6 |
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6 | /////////////////////////////////////////////////////////////////////////////////// |
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7 | // Implementation notes: |
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8 | // All accesses to HBA registers are done by the two |
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9 | // _hba_set_register() and _hba_get_register() low-level functions, |
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10 | // that are handling virtual / physical extended addressing. |
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11 | /////////////////////////////////////////////////////////////////////////////////// |
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12 | |
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13 | #include <giet_config.h> |
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14 | #include <hard_config.h> |
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15 | #include <hba_driver.h> |
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16 | #include <xcu_driver.h> |
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17 | #include <mmc_driver.h> |
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18 | #include <kernel_locks.h> |
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19 | #include <utils.h> |
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20 | #include <tty0.h> |
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21 | #include <ctx_handler.h> |
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22 | #include <irq_handler.h> |
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23 | #include <vmem.h> |
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24 | |
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25 | /////////////////////////////////////////////////////////////////////////////////// |
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26 | // Global variables |
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27 | /////////////////////////////////////////////////////////////////////////////////// |
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28 | |
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29 | ////////////////////////////////////////////////////////////////////////////////// |
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30 | // The global variable hba_boot_mode defines the way the HBA component is used |
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31 | // and must be defined in both kernel_init.c and boot.c files. |
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32 | // - during the boot phase, only one processor has access to the HBA in synchronous |
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33 | // mode, there is no need for the allocator to use a lock |
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34 | // - after the boot phase, the HBA device can be used by several processors. The |
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35 | // allocator is protected by a sqt_lock. |
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36 | ////////////////////////////////////////////////////////////////////////////////// |
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37 | |
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38 | extern unsigned int _hba_boot_mode; |
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39 | |
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40 | __attribute__((section(".kdata"))) |
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41 | sqt_lock_t _hba_allocator_lock __attribute__((aligned(64))); |
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42 | |
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43 | // state of each slot (allocated to a task or not) |
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44 | // access must be protected by the allocator_lock in descheduling mode |
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45 | __attribute__((section(".kdata"))) |
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46 | unsigned int _hba_allocated_cmd[32]; |
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47 | |
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48 | // state of the command (active or not), for each possible slot |
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49 | // used only in descheduling mode |
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50 | __attribute__((section(".kdata"))) |
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51 | unsigned int _hba_active_cmd[32]; |
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52 | |
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53 | // global index of the task, for each entry in the command list |
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54 | __attribute__((section(".kdata"))) |
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55 | unsigned int _hba_gtid[32]; |
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56 | |
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57 | // status of HBA commands |
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58 | __attribute__((section(".kdata"))) |
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59 | unsigned int _hba_status; |
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60 | |
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61 | // command list : up to 32 commands |
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62 | __attribute__((section(".kdata"))) |
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63 | hba_cmd_desc_t _hba_cmd_list[32] __attribute__((aligned(0x40))); |
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64 | |
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65 | // command tables array : one command table per entry in command list |
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66 | __attribute__((section(".kdata"))) |
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67 | hba_cmd_table_t _hba_cmd_table[32] __attribute__((aligned(0x40))); |
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68 | |
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69 | |
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70 | ////////////////////////////////////////////////////////////////////////////// |
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71 | // This low level function returns the value of register (index) |
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72 | ////////////////////////////////////////////////////////////////////////////// |
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73 | unsigned int _hba_get_register( unsigned int index ) |
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74 | { |
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75 | unsigned int* vaddr = (unsigned int*)SEG_IOC_BASE + index; |
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76 | return _io_extended_read( vaddr ); |
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77 | } |
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78 | |
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79 | ////////////////////////////////////////////////////////////////////////////// |
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80 | // This low level function set a new value in register (index) |
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81 | ////////////////////////////////////////////////////////////////////////////// |
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82 | void _hba_set_register( unsigned int index, |
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83 | unsigned int value ) |
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84 | { |
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85 | unsigned int* vaddr = (unsigned int*)SEG_IOC_BASE + index; |
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86 | _io_extended_write( vaddr, value ); |
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87 | } |
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88 | |
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89 | /////////////////////////////////////////////////////////////////////////////// |
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90 | // Extern functions |
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91 | /////////////////////////////////////////////////////////////////////////////// |
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92 | |
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93 | /////////////////////////////////////////////////////////////////////////////// |
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94 | // This blocking fonction allocates a free command index to the task. |
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95 | // The hba_allocator_lock is used except in boot mode. |
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96 | // It returns the allocated command index (between 0 and 31) |
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97 | /////////////////////////////////////////////////////////////////////////////// |
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98 | unsigned int _hba_cmd_alloc() |
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99 | { |
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100 | unsigned int found = 0; |
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101 | unsigned int c; // command index for the loop |
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102 | unsigned int cmd_id = -1; // allocated command index when found |
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103 | |
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104 | while ( found == 0) |
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105 | { |
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106 | if ( !_hba_boot_mode ) |
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107 | _sqt_lock_acquire(&_hba_allocator_lock); |
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108 | |
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109 | for ( c = 0; c < 32 ; c++ ) |
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110 | { |
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111 | if (_hba_allocated_cmd[c] == 0) |
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112 | { |
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113 | found = 1; |
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114 | cmd_id = c; |
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115 | _hba_allocated_cmd[c] = 1; |
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116 | break; |
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117 | } |
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118 | } |
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119 | |
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120 | if ( !_hba_boot_mode ) |
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121 | _sqt_lock_release(&_hba_allocator_lock); |
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122 | } |
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123 | |
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124 | return cmd_id; |
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125 | } |
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126 | |
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127 | /////////////////////////////////////////////////////////////////////////////// |
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128 | // This function releases the command index in the hba_allocated_cmd table. |
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129 | // There is no need to take the lock because only the task which owns the |
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130 | // command can release it. |
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131 | // return 0 if success, -1 if error |
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132 | /////////////////////////////////////////////////////////////////////////////// |
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133 | unsigned int _hba_cmd_release(unsigned int cmd_id) |
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134 | { |
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135 | if ( _hba_allocated_cmd[cmd_id] == 0 ) |
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136 | { |
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137 | _printf("\n[HBA ERROR] in _hba_access() : ask to release a command which is not allocated\n"); |
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138 | return -1; |
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139 | } |
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140 | |
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141 | _hba_allocated_cmd[cmd_id] = 0; |
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142 | return 0; |
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143 | } |
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144 | |
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145 | |
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146 | /////////////////////////////////////////////////////////////////////////////// |
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147 | // This function gets a command index with the hba_cmd_alloc function. Then it |
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148 | // registers a command in both the command list and the command table. It |
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149 | // updates the HBA_PXCI register and the hba_active_cmd in descheduling mode. |
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150 | // At the end the command slot is released. |
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151 | // return 0 if success, -1 if error |
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152 | /////////////////////////////////////////////////////////////////////////////// |
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153 | unsigned int _hba_access( unsigned int use_irq, |
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154 | unsigned int to_mem, |
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155 | unsigned int lba, |
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156 | unsigned long long buf_paddr, |
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157 | unsigned int count ) |
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158 | { |
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159 | unsigned int procid = _get_procid(); |
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160 | unsigned int x = procid >> (Y_WIDTH + P_WIDTH); |
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161 | unsigned int y = (procid >> P_WIDTH) & ((1<<Y_WIDTH) - 1); |
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162 | unsigned int p = procid & ((1<<P_WIDTH)-1); |
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163 | |
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164 | #if GIET_DEBUG_IOC_DRIVER |
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165 | if (_get_proctime() > GIET_DEBUG_IOC_DRIVER) |
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166 | _printf("\n[DEBUG HBA] _hba_access() : P[%d,%d,%d] enters at cycle %d\n" |
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167 | " use_irq = %d / to_mem = %d / lba = %x / paddr = %l / count = %d\n", |
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168 | x , y , p , _get_proctime() , use_irq , to_mem , lba , buf_paddr, count ); |
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169 | #endif |
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170 | |
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171 | unsigned int cmd_id; // command index |
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172 | unsigned int pxci; // HBA_PXCI register value |
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173 | unsigned int pxis; // HBA_PXIS register value |
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174 | hba_cmd_desc_t* cmd_desc; // command descriptor pointer |
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175 | hba_cmd_table_t* cmd_table; // command table pointer |
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176 | |
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177 | // check buffer alignment |
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178 | if( buf_paddr & 0x3F ) |
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179 | { |
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180 | _printf("\n[HBA ERROR] in _hba_access() : buffer not 64 bytes aligned\n"); |
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181 | return -1; |
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182 | } |
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183 | |
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184 | // get one entry in Command List |
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185 | cmd_id = _hba_cmd_alloc(); |
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186 | |
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187 | // compute pointers on command descriptor and command table |
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188 | cmd_desc = &_hba_cmd_list[cmd_id]; |
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189 | cmd_table = &_hba_cmd_table[cmd_id]; |
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190 | |
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191 | // set buffer descriptor in command table |
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192 | cmd_table->buffer.dba = (unsigned int)(buf_paddr); |
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193 | cmd_table->buffer.dbau = (unsigned int)(buf_paddr >> 32); |
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194 | cmd_table->buffer.dbc = count * 512; |
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195 | |
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196 | // initialize command table header |
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197 | cmd_table->header.lba0 = (char)lba; |
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198 | cmd_table->header.lba1 = (char)(lba>>8); |
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199 | cmd_table->header.lba2 = (char)(lba>>16); |
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200 | cmd_table->header.lba3 = (char)(lba>>24); |
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201 | cmd_table->header.lba4 = 0; |
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202 | cmd_table->header.lba5 = 0; |
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203 | |
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204 | // initialise command descriptor |
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205 | cmd_desc->prdtl[0] = 1; |
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206 | cmd_desc->prdtl[1] = 0; |
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207 | if( to_mem ) cmd_desc->flag[0] = 0x00; |
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208 | else cmd_desc->flag[0] = 0x40; |
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209 | |
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210 | #if USE_IOB // software L2/L3 cache coherence |
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211 | |
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212 | // compute physical addresses |
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213 | unsigned long long cmd_desc_paddr; // command descriptor physical address |
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214 | unsigned long long cmd_table_paddr; // command table header physical address |
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215 | unsigned int flags; // unused |
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216 | |
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217 | if ( _get_mmu_mode() & 0x4 ) |
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218 | { |
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219 | cmd_desc_paddr = _v2p_translate( (unsigned int)cmd_desc , &flags ); |
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220 | cmd_table_paddr = _v2p_translate( (unsigned int)cmd_table , &flags ); |
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221 | } |
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222 | else |
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223 | { |
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224 | cmd_desc_paddr = (unsigned int)cmd_desc; |
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225 | cmd_table_paddr = (unsigned int)cmd_table; |
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226 | } |
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227 | |
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228 | // update external memory for command table |
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229 | _mmc_sync( cmd_table_paddr & (~0x3F) , sizeof(hba_cmd_table_t) ); |
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230 | |
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231 | // update external memory for command descriptor |
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232 | _mmc_sync( cmd_desc_paddr & (~0x3F) , sizeof(hba_cmd_desc_t) ); |
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233 | |
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234 | // inval or synchronize memory buffer |
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235 | if ( to_mem ) _mmc_inval( buf_paddr, count<<9 ); |
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236 | else _mmc_sync( buf_paddr, count<<9 ); |
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237 | |
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238 | #endif // end software L2/L3 cache coherence |
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239 | |
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240 | ///////////////////////////////////////////////////////////////////// |
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241 | // In synchronous mode, we poll the PXCI register until completion |
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242 | ///////////////////////////////////////////////////////////////////// |
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243 | if ( use_irq == 0 ) |
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244 | { |
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245 | // start HBA transfer |
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246 | _hba_set_register( HBA_PXCI, (1<<cmd_id) ); |
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247 | |
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248 | #if GIET_DEBUG_IOC_DRIVER |
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249 | if (_get_proctime() > GIET_DEBUG_IOC_DRIVER) |
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250 | _printf("\n[DEBUG HBA] _hba_access() : P[%d,%d,%d] get slot %d in Cmd List " |
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251 | " at cycle %d / polling\n", |
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252 | x , y , p , cmd_id, _get_proctime() ); |
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253 | #endif |
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254 | // disable IRQs in PXIE register |
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255 | _hba_set_register( HBA_PXIE , 0 ); |
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256 | |
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257 | // poll PXCI[cmd_id] until command completed by HBA |
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258 | do |
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259 | { |
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260 | pxci = _hba_get_register( HBA_PXCI ); |
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261 | |
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262 | #if GIET_DEBUG_IOC_DRIVER |
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263 | if (_get_proctime() > GIET_DEBUG_IOC_DRIVER) |
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264 | _printf("\n[DEBUG HBA] _hba_access() : P[%d,%d,%d] wait on HBA_PXCI / pxci = %x\n", |
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265 | x , y , p , pxci ); |
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266 | #endif |
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267 | } |
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268 | while( pxci & (1<<cmd_id) ); |
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269 | |
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270 | // get PXIS register |
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271 | pxis = _hba_get_register( HBA_PXIS ); |
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272 | |
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273 | // reset PXIS register |
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274 | _hba_set_register( HBA_PXIS , 0 ); |
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275 | } |
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276 | |
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277 | ///////////////////////////////////////////////////////////////// |
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278 | // in descheduling mode, we deschedule the task |
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279 | // and use an interrupt to reschedule the task. |
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280 | // We need a critical section, because we must reset the RUN bit |
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281 | // before to launch the transfer, and we don't want to be |
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282 | // descheduled between these two operations. |
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283 | ///////////////////////////////////////////////////////////////// |
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284 | else |
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285 | { |
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286 | |
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287 | #if GIET_DEBUG_IOC_DRIVER |
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288 | if (_get_proctime() > GIET_DEBUG_IOC_DRIVER) |
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289 | _printf("\n[DEBUG HBA] _hba_access() : P[%d,%d,%d] get slot %d in Cmd List " |
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290 | "at cycle %d / descheduling\n", |
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291 | x , y , p , cmd_id, _get_proctime() ); |
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292 | #endif |
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293 | unsigned int save_sr; |
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294 | unsigned int ltid = _get_current_task_id(); |
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295 | |
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296 | // activates HBA interrupts |
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297 | _hba_set_register( HBA_PXIE , 0x00000001 ); |
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298 | |
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299 | // set _hba_gtid[cmd_id] |
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300 | _hba_gtid[cmd_id] = (procid<<16) + ltid; |
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301 | |
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302 | // enters critical section |
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303 | _it_disable( &save_sr ); |
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304 | |
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305 | // reset runnable |
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306 | _set_task_slot( x, y, p, ltid, CTX_RUN_ID, 0 ); |
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307 | |
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308 | // start HBA transfer |
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309 | _hba_set_register( HBA_PXCI, (1<<cmd_id) ); |
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310 | |
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311 | // set _hba_active_cmd[cmd_id] |
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312 | _hba_active_cmd[cmd_id] = 1; |
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313 | |
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314 | // deschedule task |
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315 | _ctx_switch(); |
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316 | |
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317 | #if GIET_DEBUG_IOC_DRIVER |
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318 | if (_get_proctime() > GIET_DEBUG_IOC_DRIVER) |
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319 | _printf("\n[DEBUG HBA] _hba_access() : task %d on P[%d,%d,%d] resume at cycle %d\n", |
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320 | ltid , x , y , p , _get_proctime() ); |
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321 | #endif |
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322 | |
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323 | // restore SR |
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324 | _it_restore( &save_sr ); |
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325 | |
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326 | // get command status |
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327 | pxis = _hba_status; |
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328 | } |
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329 | |
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330 | // release the cmd index |
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331 | unsigned int release_success; |
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332 | release_success = _hba_cmd_release(cmd_id); |
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333 | |
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334 | #if GIET_DEBUG_IOC_DRIVER |
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335 | if (_get_proctime() > GIET_DEBUG_IOC_DRIVER) |
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336 | _printf("\n[DEBUG HBA] _hba_access() : P[%d,%d,%d] release slot %d in Cmd List " |
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337 | "and exit at cycle %d\n", |
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338 | x , y , p, cmd_id, |
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339 | _get_proctime() ); |
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340 | #endif |
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341 | |
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342 | if ( release_success != 0 ) return -1; |
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343 | else if ( pxis & 0x40000000 ) return pxis; |
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344 | else return 0; |
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345 | |
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346 | } // end _hba_access() |
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347 | |
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348 | |
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349 | //////////////////////// |
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350 | unsigned int _hba_init() |
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351 | { |
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352 | unsigned int cmd_list_vaddr; |
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353 | unsigned int cmd_table_vaddr; |
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354 | unsigned long long cmd_list_paddr; |
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355 | unsigned long long cmd_table_paddr; |
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356 | unsigned int flags; // unused |
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357 | |
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358 | // compute Command list & command table physical addresses |
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359 | cmd_list_vaddr = (unsigned int)(&_hba_cmd_list[0]); |
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360 | cmd_table_vaddr = (unsigned int)(&_hba_cmd_table[0]); |
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361 | if ( _get_mmu_mode() & 0x4 ) |
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362 | { |
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363 | cmd_list_paddr = _v2p_translate( cmd_list_vaddr , &flags ); |
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364 | cmd_table_paddr = _v2p_translate( cmd_table_vaddr , &flags ); |
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365 | } |
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366 | else |
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367 | { |
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368 | cmd_list_paddr = (unsigned long long)cmd_list_vaddr; |
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369 | cmd_table_paddr = (unsigned long long)cmd_table_vaddr; |
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370 | } |
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371 | |
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372 | // initialise allocator lock if not in boot mode |
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373 | if ( !_hba_boot_mode ) |
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374 | _sqt_lock_init(&_hba_allocator_lock); |
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375 | |
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376 | // initialise Command Descriptors in Command List, allocated command table |
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377 | // and active command table |
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378 | unsigned int c; |
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379 | unsigned long long paddr; |
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380 | for( c=0 ; c<32 ; c++ ) |
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381 | { |
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382 | paddr = cmd_table_paddr + c * sizeof(hba_cmd_table_t); |
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383 | _hba_cmd_list[c].ctba = (unsigned int)(paddr); |
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384 | _hba_cmd_list[c].ctbau = (unsigned int)(paddr>>32); |
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385 | _hba_allocated_cmd[c] = 0; |
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386 | _hba_active_cmd[c] = 0; |
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387 | } |
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388 | |
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389 | // initialise HBA registers |
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390 | _hba_set_register( HBA_PXCLB , (unsigned int)(cmd_list_paddr) ); |
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391 | _hba_set_register( HBA_PXCLBU , (unsigned int)(cmd_list_paddr>>32) ); |
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392 | _hba_set_register( HBA_PXIE , 0 ); |
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393 | _hba_set_register( HBA_PXIS , 0 ); |
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394 | _hba_set_register( HBA_PXCI , 0 ); |
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395 | _hba_set_register( HBA_PXCMD , 1 ); |
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396 | |
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397 | return 0; |
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398 | } |
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399 | |
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400 | |
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401 | ///////////////////////////////////////////////////// |
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402 | void _hba_isr( unsigned int irq_type, // HWI / WTI |
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403 | unsigned int irq_id, // index returned by ICU |
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404 | unsigned int channel ) // unused |
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405 | { |
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406 | // save PXIS register if there is no previous error |
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407 | if ( !(_hba_status & 0x40000000)) |
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408 | _hba_status = _hba_get_register( HBA_PXIS ); |
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409 | |
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410 | // reset PXIS register |
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411 | _hba_set_register( HBA_PXIS , 0 ); |
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412 | |
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413 | unsigned int cmd_id; // cmd index for the loops |
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414 | |
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415 | // save the current list of active cmd in a 32 bits word |
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416 | unsigned int current_active_cmd = 0; |
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417 | for ( cmd_id = 0 ; cmd_id < 32 ; cmd_id ++ ) |
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418 | { |
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419 | if ( _hba_active_cmd[cmd_id] == 1 ) current_active_cmd += (1 << cmd_id); |
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420 | } |
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421 | |
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422 | // get HBA_PXCI containing commands status |
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423 | unsigned int current_pxci = _hba_get_register( HBA_PXCI ); |
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424 | |
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425 | for ( cmd_id = 0 ; cmd_id < 32 ; cmd_id ++ ) |
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426 | { |
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427 | if ( ( (current_active_cmd & (1<<cmd_id)) != 0) && // active command |
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428 | ( (current_pxci & (1<<cmd_id)) == 0 ) ) // completed command |
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429 | { |
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430 | // desactivate the command |
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431 | _hba_active_cmd[cmd_id] = 0; |
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432 | |
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433 | // identify waiting task |
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434 | unsigned int remote_procid = _hba_gtid[cmd_id]>>16; |
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435 | unsigned int ltid = _hba_gtid[cmd_id] & 0xFFFF; |
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436 | unsigned int remote_cluster = remote_procid >> P_WIDTH; |
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437 | unsigned int remote_x = remote_cluster >> Y_WIDTH; |
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438 | unsigned int remote_y = remote_cluster & ((1<<Y_WIDTH)-1); |
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439 | unsigned int remote_p = remote_procid & ((1<<P_WIDTH)-1); |
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440 | |
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441 | // re-activates waiting task |
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442 | _set_task_slot( remote_x, |
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443 | remote_y, |
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444 | remote_p, |
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445 | ltid, |
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446 | CTX_RUN_ID, |
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447 | 1 ); |
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448 | |
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449 | // send a WAKUP WTI to processor running the waiting task |
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450 | _xcu_send_wti( remote_cluster , |
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451 | remote_p , |
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452 | 0 ); // don't force context switch |
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453 | |
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454 | #if GIET_DEBUG_IOC_DRIVER |
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455 | if (_get_proctime() > GIET_DEBUG_IOC_DRIVER) |
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456 | _printf("\n[DEBUG HBA] _hba_isr() : command %d completed at cycle %d\n" |
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457 | " resume task %d running on P[%d,%d,%d]\n", |
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458 | cmd_id , _get_proctime() , |
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459 | ltid , remote_x , remote_y , remote_p ); |
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460 | #endif |
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461 | } |
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462 | } |
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463 | } // end _hba_isr() |
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464 | |
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465 | // Local Variables: |
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466 | // tab-width: 4 |
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467 | // c-basic-offset: 4 |
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468 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
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469 | // indent-tabs-mode: nil |
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470 | // End: |
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471 | // vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
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472 | |
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