1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief SD Card LibI2C driver. |
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5 | */ |
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6 | |
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7 | /* |
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8 | * Copyright (c) 2008 |
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9 | * Embedded Brains GmbH |
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10 | * Obere Lagerstr. 30 |
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11 | * D-82178 Puchheim |
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12 | * Germany |
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13 | * rtems@embedded-brains.de |
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14 | * |
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15 | * The license and distribution terms for this file may be found in the file |
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16 | * LICENSE in this distribution or at http://www.rtems.com/license/LICENSE. |
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17 | */ |
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18 | |
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19 | #include <stdio.h> |
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20 | #include <errno.h> |
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21 | #include <inttypes.h> |
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22 | |
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23 | #include <rtems.h> |
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24 | #include <rtems/libi2c.h> |
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25 | #include <rtems/libio.h> |
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26 | #include <rtems/diskdevs.h> |
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27 | #include <rtems/blkdev.h> |
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28 | |
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29 | #include <libchip/spi-sd-card.h> |
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30 | |
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31 | #include <rtems/status-checks.h> |
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32 | |
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33 | /** |
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34 | * @name Integer to and from Byte-Stream Converter |
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35 | * @{ |
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36 | */ |
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37 | |
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38 | static inline uint16_t sd_card_get_uint16( const uint8_t *s) |
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39 | { |
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40 | return (uint16_t) ((s [0] << 8) | s [1]); |
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41 | } |
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42 | |
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43 | static inline uint32_t sd_card_get_uint32( const uint8_t *s) |
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44 | { |
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45 | return ((uint32_t) s [0] << 24) | ((uint32_t) s [1] << 16) | ((uint32_t) s [2] << 8) | (uint32_t) s [3]; |
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46 | } |
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47 | |
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48 | static inline void sd_card_put_uint16( uint16_t v, uint8_t *s) |
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49 | { |
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50 | *s++ = (uint8_t) (v >> 8); |
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51 | *s = (uint8_t) (v); |
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52 | } |
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53 | |
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54 | static inline void sd_card_put_uint32( uint32_t v, uint8_t *s) |
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55 | { |
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56 | *s++ = (uint8_t) (v >> 24); |
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57 | *s++ = (uint8_t) (v >> 16); |
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58 | *s++ = (uint8_t) (v >> 8); |
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59 | *s = (uint8_t) (v); |
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60 | } |
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61 | |
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62 | /** @} */ |
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63 | |
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64 | #define SD_CARD_BUSY_TOKEN 0 |
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65 | |
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66 | #define SD_CARD_BLOCK_SIZE_DEFAULT 512 |
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67 | |
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68 | #define SD_CARD_COMMAND_RESPONSE_START 7 |
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69 | |
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70 | /** |
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71 | * @name Commands |
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72 | * @{ |
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73 | */ |
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74 | |
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75 | #define SD_CARD_CMD_GO_IDLE_STATE 0 |
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76 | #define SD_CARD_CMD_SEND_OP_COND 1 |
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77 | #define SD_CARD_CMD_SEND_IF_COND 8 |
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78 | #define SD_CARD_CMD_SEND_CSD 9 |
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79 | #define SD_CARD_CMD_SEND_CID 10 |
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80 | #define SD_CARD_CMD_STOP_TRANSMISSION 12 |
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81 | #define SD_CARD_CMD_SEND_STATUS 13 |
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82 | #define SD_CARD_CMD_SET_BLOCKLEN 16 |
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83 | #define SD_CARD_CMD_READ_SINGLE_BLOCK 17 |
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84 | #define SD_CARD_CMD_READ_MULTIPLE_BLOCK 18 |
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85 | #define SD_CARD_CMD_SET_BLOCK_COUNT 23 |
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86 | #define SD_CARD_CMD_WRITE_BLOCK 24 |
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87 | #define SD_CARD_CMD_WRITE_MULTIPLE_BLOCK 25 |
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88 | #define SD_CARD_CMD_PROGRAM_CSD 27 |
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89 | #define SD_CARD_CMD_SET_WRITE_PROT 28 |
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90 | #define SD_CARD_CMD_CLR_WRITE_PROT 29 |
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91 | #define SD_CARD_CMD_SEND_WRITE_PROT 30 |
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92 | #define SD_CARD_CMD_TAG_SECTOR_START 32 |
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93 | #define SD_CARD_CMD_TAG_SECTOR_END 33 |
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94 | #define SD_CARD_CMD_UNTAG_SECTOR 34 |
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95 | #define SD_CARD_CMD_TAG_ERASE_GROUP_START 35 |
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96 | #define SD_CARD_CMD_TAG_ERASE_GROUP_END 36 |
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97 | #define SD_CARD_CMD_UNTAG_ERASE_GROUP 37 |
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98 | #define SD_CARD_CMD_ERASE 38 |
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99 | #define SD_CARD_CMD_LOCK_UNLOCK 42 |
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100 | #define SD_CARD_CMD_APP_CMD 55 |
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101 | #define SD_CARD_CMD_GEN_CND 56 |
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102 | #define SD_CARD_CMD_READ_OCR 58 |
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103 | #define SD_CARD_CMD_CRC_ON_OFF 59 |
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104 | |
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105 | /** @} */ |
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106 | |
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107 | /** |
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108 | * @name Application Commands |
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109 | * @{ |
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110 | */ |
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111 | |
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112 | #define SD_CARD_ACMD_SD_SEND_OP_COND 41 |
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113 | |
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114 | /** @} */ |
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115 | |
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116 | /** |
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117 | * @name Command Flags |
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118 | * @{ |
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119 | */ |
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120 | |
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121 | #define SD_CARD_FLAG_HCS 0x40000000U |
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122 | |
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123 | #define SD_CARD_FLAG_VHS_2_7_TO_3_3 0x00000100U |
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124 | |
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125 | #define SD_CARD_FLAG_CHECK_PATTERN 0x000000aaU |
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126 | |
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127 | /** @} */ |
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128 | |
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129 | /** |
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130 | * @name Command Fields |
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131 | * @{ |
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132 | */ |
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133 | |
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134 | #define SD_CARD_COMMAND_SET_COMMAND( c, cmd) (c) [1] = (uint8_t) (0x40 + ((cmd) & 0x3f)) |
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135 | |
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136 | #define SD_CARD_COMMAND_SET_ARGUMENT( c, arg) sd_card_put_uint32( (arg), &((c) [2])) |
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137 | |
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138 | #define SD_CARD_COMMAND_SET_CRC7( c, crc7) ((c) [6] = ((crc7) << 1) | 1U) |
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139 | |
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140 | #define SD_CARD_COMMAND_GET_CRC7( c) ((c) [6] >> 1) |
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141 | |
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142 | /** @} */ |
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143 | |
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144 | /** |
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145 | * @name Response Fields |
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146 | * @{ |
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147 | */ |
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148 | |
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149 | #define SD_CARD_IS_RESPONSE( r) (((r) & 0x80) == 0) |
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150 | |
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151 | #define SD_CARD_IS_ERRORLESS_RESPONSE( r) (((r) & 0x7e) == 0) |
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152 | |
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153 | #define SD_CARD_IS_NOT_IDLE_RESPONSE( r) (((r) & 0x81) == 0) |
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154 | |
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155 | #define SD_CARD_IS_DATA_ERROR( r) (((r) & 0xe0) == 0) |
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156 | |
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157 | #define SD_CARD_IS_DATA_REJECTED( r) (((r) & 0x1f) != 0x05) |
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158 | |
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159 | /** @} */ |
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160 | |
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161 | /** |
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162 | * @name Card Identification |
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163 | * @{ |
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164 | */ |
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165 | |
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166 | #define SD_CARD_CID_SIZE 16 |
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167 | |
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168 | #define SD_CARD_CID_GET_MID( cid) ((cid) [0]) |
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169 | #define SD_CARD_CID_GET_OID( cid) sd_card_get_uint16( cid + 1) |
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170 | #define SD_CARD_CID_GET_PNM( cid, i) ((char) (cid) [3 + (i)]) |
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171 | #define SD_CARD_CID_GET_PRV( cid) ((cid) [9]) |
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172 | #define SD_CARD_CID_GET_PSN( cid) sd_card_get_uint32( cid + 10) |
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173 | #define SD_CARD_CID_GET_MDT( cid) ((cid) [14]) |
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174 | #define SD_CARD_CID_GET_CRC7( cid) ((cid) [15] >> 1) |
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175 | |
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176 | /** @} */ |
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177 | |
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178 | /** |
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179 | * @name Card Specific Data |
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180 | * @{ |
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181 | */ |
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182 | |
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183 | #define SD_CARD_CSD_SIZE 16 |
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184 | |
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185 | #define SD_CARD_CSD_GET_CSD_STRUCTURE( csd) ((csd) [0] >> 6) |
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186 | #define SD_CARD_CSD_GET_SPEC_VERS( csd) (((csd) [0] >> 2) & 0xf) |
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187 | #define SD_CARD_CSD_GET_TAAC( csd) ((csd) [1]) |
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188 | #define SD_CARD_CSD_GET_NSAC( csd) ((uint32_t) (csd) [2]) |
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189 | #define SD_CARD_CSD_GET_TRAN_SPEED( csd) ((csd) [3]) |
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190 | #define SD_CARD_CSD_GET_C_SIZE( csd) ((((uint32_t) (csd) [6] & 0x3) << 10) + (((uint32_t) (csd) [7]) << 2) + ((((uint32_t) (csd) [8]) >> 6) & 0x3)) |
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191 | #define SD_CARD_CSD_GET_C_SIZE_MULT( csd) ((((csd) [9] & 0x3) << 1) + (((csd) [10] >> 7) & 0x1)) |
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192 | #define SD_CARD_CSD_GET_READ_BLK_LEN( csd) ((uint32_t) (csd) [5] & 0xf) |
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193 | #define SD_CARD_CSD_GET_WRITE_BLK_LEN( csd) ((((uint32_t) (csd) [12] & 0x3) << 2) + ((((uint32_t) (csd) [13]) >> 6) & 0x3)) |
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194 | #define SD_CARD_CSD_1_GET_C_SIZE( csd) ((((uint32_t) (csd) [7] & 0x3f) << 16) + (((uint32_t) (csd) [8]) << 8) + (uint32_t) (csd) [9]) |
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195 | |
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196 | /** @} */ |
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197 | |
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198 | #define SD_CARD_INVALIDATE_RESPONSE_INDEX( e) e->response_index = SD_CARD_COMMAND_SIZE |
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199 | |
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200 | /** |
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201 | * @name Data Start and Stop Tokens |
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202 | * @{ |
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203 | */ |
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204 | |
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205 | #define SD_CARD_START_BLOCK_SINGLE_BLOCK_READ 0xfe |
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206 | #define SD_CARD_START_BLOCK_MULTIPLE_BLOCK_READ 0xfe |
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207 | #define SD_CARD_START_BLOCK_SINGLE_BLOCK_WRITE 0xfe |
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208 | #define SD_CARD_START_BLOCK_MULTIPLE_BLOCK_WRITE 0xfc |
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209 | #define SD_CARD_STOP_TRANSFER_MULTIPLE_BLOCK_WRITE 0xfd |
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210 | |
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211 | /** @} */ |
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212 | |
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213 | /** |
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214 | * @name Card Specific Data Functions |
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215 | * @{ |
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216 | */ |
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217 | |
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218 | static inline uint32_t sd_card_block_number( const uint8_t *csd) |
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219 | { |
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220 | uint32_t size = SD_CARD_CSD_GET_C_SIZE( csd); |
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221 | uint32_t mult = 1U << (SD_CARD_CSD_GET_C_SIZE_MULT( csd) + 2); |
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222 | return (size + 1) * mult; |
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223 | } |
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224 | |
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225 | static inline uint32_t sd_card_capacity( const uint8_t *csd) |
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226 | { |
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227 | uint32_t block_size = 1U << SD_CARD_CSD_GET_READ_BLK_LEN( csd); |
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228 | return sd_card_block_number( csd) * block_size; |
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229 | } |
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230 | |
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231 | static inline uint32_t sd_card_transfer_speed( const uint8_t *csd) |
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232 | { |
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233 | uint32_t s = SD_CARD_CSD_GET_TRAN_SPEED( csd); |
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234 | uint32_t e = s & 0x7; |
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235 | uint32_t m = s >> 3; |
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236 | switch (e) { |
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237 | case 0: s = 10000; break; |
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238 | case 1: s = 100000; break; |
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239 | case 2: s = 1000000; break; |
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240 | case 3: s = 10000000; break; |
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241 | default: s = 0; break; |
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242 | } |
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243 | switch (m) { |
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244 | case 1: s *= 10; break; |
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245 | case 2: s *= 12; break; |
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246 | case 3: s *= 13; break; |
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247 | case 4: s *= 15; break; |
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248 | case 5: s *= 20; break; |
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249 | case 6: s *= 25; break; |
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250 | case 7: s *= 30; break; |
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251 | case 8: s *= 35; break; |
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252 | case 9: s *= 40; break; |
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253 | case 10: s *= 45; break; |
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254 | case 11: s *= 50; break; |
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255 | case 12: s *= 55; break; |
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256 | case 13: s *= 60; break; |
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257 | case 14: s *= 70; break; |
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258 | case 15: s *= 80; break; |
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259 | default: s *= 0; break; |
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260 | } |
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261 | return s; |
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262 | } |
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263 | |
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264 | static inline uint32_t sd_card_access_time( const uint8_t *csd) |
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265 | { |
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266 | uint32_t ac = SD_CARD_CSD_GET_TAAC( csd); |
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267 | uint32_t e = ac & 0x7; |
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268 | uint32_t m = ac >> 3; |
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269 | switch (e) { |
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270 | case 0: ac = 1; break; |
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271 | case 1: ac = 10; break; |
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272 | case 2: ac = 100; break; |
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273 | case 3: ac = 1000; break; |
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274 | case 4: ac = 10000; break; |
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275 | case 5: ac = 100000; break; |
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276 | case 6: ac = 1000000; break; |
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277 | case 7: ac = 10000000; break; |
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278 | default: ac = 0; break; |
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279 | } |
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280 | switch (m) { |
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281 | case 1: ac *= 10; break; |
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282 | case 2: ac *= 12; break; |
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283 | case 3: ac *= 13; break; |
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284 | case 4: ac *= 15; break; |
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285 | case 5: ac *= 20; break; |
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286 | case 6: ac *= 25; break; |
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287 | case 7: ac *= 30; break; |
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288 | case 8: ac *= 35; break; |
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289 | case 9: ac *= 40; break; |
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290 | case 10: ac *= 45; break; |
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291 | case 11: ac *= 50; break; |
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292 | case 12: ac *= 55; break; |
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293 | case 13: ac *= 60; break; |
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294 | case 14: ac *= 70; break; |
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295 | case 15: ac *= 80; break; |
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296 | default: ac *= 0; break; |
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297 | } |
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298 | return ac / 10; |
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299 | } |
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300 | |
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301 | static inline uint32_t sd_card_max_access_time( const uint8_t *csd, uint32_t transfer_speed) |
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302 | { |
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303 | uint64_t ac = sd_card_access_time( csd); |
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304 | uint32_t ac_100ms = transfer_speed / 80; |
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305 | uint32_t n = SD_CARD_CSD_GET_NSAC( csd) * 100; |
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306 | /* ac is in ns, transfer_speed in bps, max_access_time in bytes. |
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307 | max_access_time is 100 times typical access time (taac+nsac) */ |
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308 | ac = ac * transfer_speed / 80000000; |
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309 | ac = ac + 100*n; |
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310 | if ((uint32_t)ac > ac_100ms) |
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311 | return ac_100ms; |
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312 | else |
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313 | return (uint32_t)ac; |
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314 | } |
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315 | |
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316 | /** @} */ |
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317 | |
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318 | /** |
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319 | * @name CRC functions |
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320 | * |
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321 | * Based on http://en.wikipedia.org/wiki/Computation_of_CRC |
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322 | * |
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323 | * @{ |
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324 | */ |
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325 | |
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326 | static uint8_t sd_card_compute_crc7 (uint8_t *data, size_t len) |
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327 | { |
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328 | uint8_t e, f, crc; |
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329 | size_t i; |
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330 | |
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331 | crc = 0; |
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332 | for (i = 0; i < len; i++) { |
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333 | e = crc ^ data[i]; |
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334 | f = e ^ (e >> 4) ^ (e >> 7); |
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335 | crc = (f << 1) ^ (f << 4); |
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336 | } |
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337 | return crc >> 1; |
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338 | } |
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339 | |
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340 | static uint16_t sd_card_compute_crc16 (uint8_t *data, size_t len) |
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341 | { |
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342 | uint8_t s, t; |
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343 | uint16_t crc; |
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344 | size_t i; |
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345 | |
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346 | crc = 0; |
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347 | for (i = 0; i < len; i++) { |
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348 | s = data[i] ^ (crc >> 8); |
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349 | t = s ^ (s >> 4); |
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350 | crc = (crc << 8) ^ t ^ (t << 5) ^ (t << 12); |
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351 | } |
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352 | return crc; |
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353 | } |
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354 | |
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355 | /** @} */ |
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356 | |
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357 | /** |
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358 | * @name Communication Functions |
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359 | * @{ |
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360 | */ |
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361 | |
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362 | static inline int sd_card_query( sd_card_driver_entry *e, uint8_t *in, int n) |
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363 | { |
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364 | return rtems_libi2c_read_bytes( e->bus, in, n); |
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365 | } |
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366 | |
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367 | static int sd_card_wait( sd_card_driver_entry *e) |
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368 | { |
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369 | int rv = 0; |
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370 | int r = 0; |
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371 | int n = 2; |
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372 | /* For writes, the timeout is 2.5 times that of reads; since we |
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373 | don't know if it is a write or read, assume write. |
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374 | FIXME should actually look at R2W_FACTOR for non-HC cards. */ |
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375 | int retries = e->n_ac_max * 25 / 10; |
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376 | /* n_ac_max/100 is supposed to be the average waiting time. To |
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377 | approximate this, we start with waiting n_ac_max/150 and |
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378 | gradually increase the waiting time. */ |
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379 | int wait_time_bytes = (retries + 149) / 150; |
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380 | while (e->busy) { |
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381 | /* Query busy tokens */ |
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382 | rv = sd_card_query( e, e->response, n); |
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383 | RTEMS_CHECK_RV( rv, "Busy"); |
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384 | |
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385 | /* Search for non busy tokens */ |
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386 | for (r = 0; r < n; ++r) { |
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387 | if (e->response [r] != SD_CARD_BUSY_TOKEN) { |
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388 | e->busy = false; |
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389 | return 0; |
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390 | } |
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391 | } |
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392 | retries -= n; |
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393 | if (retries <= 0) { |
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394 | return -RTEMS_TIMEOUT; |
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395 | } |
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396 | |
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397 | if (e->schedule_if_busy) { |
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398 | uint64_t wait_time_us = wait_time_bytes; |
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399 | wait_time_us *= 8000000; |
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400 | wait_time_us /= e->transfer_mode.baudrate; |
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401 | rtems_task_wake_after( RTEMS_MICROSECONDS_TO_TICKS(wait_time_us)); |
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402 | retries -= wait_time_bytes; |
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403 | wait_time_bytes = wait_time_bytes * 15 / 10; |
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404 | } else { |
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405 | n = SD_CARD_COMMAND_SIZE; |
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406 | } |
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407 | } |
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408 | return 0; |
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409 | } |
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410 | |
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411 | static int sd_card_send_command( sd_card_driver_entry *e, uint32_t command, uint32_t argument) |
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412 | { |
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413 | int rv = 0; |
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414 | rtems_libi2c_read_write_t rw = { |
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415 | .rd_buf = e->response, |
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416 | .wr_buf = e->command, |
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417 | .byte_cnt = SD_CARD_COMMAND_SIZE |
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418 | }; |
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419 | int r = 0; |
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420 | uint8_t crc7; |
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421 | |
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422 | SD_CARD_INVALIDATE_RESPONSE_INDEX( e); |
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423 | |
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424 | /* Wait until card is not busy */ |
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425 | rv = sd_card_wait( e); |
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426 | RTEMS_CHECK_RV( rv, "Wait"); |
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427 | |
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428 | /* Write command and read response */ |
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429 | SD_CARD_COMMAND_SET_COMMAND( e->command, command); |
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430 | SD_CARD_COMMAND_SET_ARGUMENT( e->command, argument); |
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431 | crc7 = sd_card_compute_crc7( e->command + 1, 5); |
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432 | SD_CARD_COMMAND_SET_CRC7( e->command, crc7); |
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433 | rv = rtems_libi2c_ioctl( e->bus, RTEMS_LIBI2C_IOCTL_READ_WRITE, &rw); |
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434 | RTEMS_CHECK_RV( rv, "Write command and read response"); |
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435 | |
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436 | /* Check respose */ |
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437 | for (r = SD_CARD_COMMAND_RESPONSE_START; r < SD_CARD_COMMAND_SIZE; ++r) { |
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438 | RTEMS_DEBUG_PRINT( "Token [%02u]: 0x%02x\n", r, e->response [r]); |
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439 | e->response_index = r; |
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440 | if (SD_CARD_IS_RESPONSE( e->response [r])) { |
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441 | if (SD_CARD_IS_ERRORLESS_RESPONSE( e->response [r])) { |
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442 | return 0; |
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443 | } else { |
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444 | RTEMS_SYSLOG_ERROR( "Command error [%02i]: 0x%02" PRIx8 "\n", r, e->response [r]); |
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445 | goto sd_card_send_command_error; |
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446 | } |
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447 | } else if (e->response [r] != SD_CARD_IDLE_TOKEN) { |
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448 | RTEMS_SYSLOG_ERROR( "Unexpected token [%02i]: 0x%02" PRIx8 "\n", r, e->response [r]); |
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449 | goto sd_card_send_command_error; |
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450 | } |
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451 | } |
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452 | |
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453 | RTEMS_SYSLOG_ERROR( "Timeout\n"); |
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454 | |
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455 | sd_card_send_command_error: |
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456 | |
---|
457 | RTEMS_SYSLOG_ERROR( "Response:"); |
---|
458 | for (r = 0; r < SD_CARD_COMMAND_SIZE; ++r) { |
---|
459 | if (e->response_index == r) { |
---|
460 | RTEMS_SYSLOG_PRINT( " %02" PRIx8 ":[%02" PRIx8 "]", e->command [r], e->response [r]); |
---|
461 | } else { |
---|
462 | RTEMS_SYSLOG_PRINT( " %02" PRIx8 ":%02" PRIx8 "", e->command [r], e->response [r]); |
---|
463 | } |
---|
464 | } |
---|
465 | RTEMS_SYSLOG_PRINT( "\n"); |
---|
466 | |
---|
467 | return -RTEMS_IO_ERROR; |
---|
468 | } |
---|
469 | |
---|
470 | static int sd_card_send_register_command( sd_card_driver_entry *e, uint32_t command, uint32_t argument, uint32_t *reg) |
---|
471 | { |
---|
472 | int rv = 0; |
---|
473 | uint8_t crc7; |
---|
474 | |
---|
475 | rv = sd_card_send_command( e, command, argument); |
---|
476 | RTEMS_CHECK_RV( rv, "Send command"); |
---|
477 | |
---|
478 | if (e->response_index + 5 > SD_CARD_COMMAND_SIZE) { |
---|
479 | /* |
---|
480 | * TODO: If this happens in the wild we need to implement a |
---|
481 | * more sophisticated response query. |
---|
482 | */ |
---|
483 | RTEMS_SYSLOG_ERROR( "Unexpected response position\n"); |
---|
484 | return -RTEMS_IO_ERROR; |
---|
485 | } |
---|
486 | |
---|
487 | crc7 = sd_card_compute_crc7( e->response + e->response_index, 5); |
---|
488 | if (crc7 != SD_CARD_COMMAND_GET_CRC7( e->response + e->response_index) && |
---|
489 | SD_CARD_COMMAND_GET_CRC7( e->response + e->response_index) != 0x7f) { |
---|
490 | RTEMS_SYSLOG_ERROR( "CRC check failed on register command\n"); |
---|
491 | return -RTEMS_IO_ERROR; |
---|
492 | } |
---|
493 | |
---|
494 | *reg = sd_card_get_uint32( e->response + e->response_index + 1); |
---|
495 | |
---|
496 | return 0; |
---|
497 | } |
---|
498 | |
---|
499 | static int sd_card_stop_multiple_block_read( sd_card_driver_entry *e) |
---|
500 | { |
---|
501 | int rv = 0; |
---|
502 | |
---|
503 | SD_CARD_COMMAND_SET_COMMAND( e->command, SD_CARD_CMD_STOP_TRANSMISSION); |
---|
504 | rv = rtems_libi2c_write_bytes( e->bus, e->command, SD_CARD_COMMAND_SIZE); |
---|
505 | RTEMS_CHECK_RV( rv, "Write stop transfer token"); |
---|
506 | |
---|
507 | return 0; |
---|
508 | } |
---|
509 | |
---|
510 | static int sd_card_stop_multiple_block_write( sd_card_driver_entry *e) |
---|
511 | { |
---|
512 | int rv = 0; |
---|
513 | uint8_t stop_transfer [3] = { SD_CARD_IDLE_TOKEN, SD_CARD_STOP_TRANSFER_MULTIPLE_BLOCK_WRITE, SD_CARD_IDLE_TOKEN }; |
---|
514 | |
---|
515 | /* Wait until card is not busy */ |
---|
516 | rv = sd_card_wait( e); |
---|
517 | RTEMS_CHECK_RV( rv, "Wait"); |
---|
518 | |
---|
519 | /* Send stop token */ |
---|
520 | rv = rtems_libi2c_write_bytes( e->bus, stop_transfer, 3); |
---|
521 | RTEMS_CHECK_RV( rv, "Write stop transfer token"); |
---|
522 | |
---|
523 | /* Card is now busy */ |
---|
524 | e->busy = true; |
---|
525 | |
---|
526 | return 0; |
---|
527 | } |
---|
528 | |
---|
529 | static int sd_card_read( sd_card_driver_entry *e, uint8_t start_token, uint8_t *in, int n) |
---|
530 | { |
---|
531 | int rv = 0; |
---|
532 | |
---|
533 | /* Discard command response */ |
---|
534 | int r = e->response_index + 1; |
---|
535 | |
---|
536 | /* Standard response size */ |
---|
537 | int response_size = SD_CARD_COMMAND_SIZE; |
---|
538 | |
---|
539 | /* Where the response is stored */ |
---|
540 | uint8_t *response = e->response; |
---|
541 | |
---|
542 | /* Data input index */ |
---|
543 | int i = 0; |
---|
544 | |
---|
545 | /* CRC check of data */ |
---|
546 | uint16_t crc16; |
---|
547 | |
---|
548 | /* Maximum number of tokens to read. */ |
---|
549 | int retries = e->n_ac_max; |
---|
550 | |
---|
551 | SD_CARD_INVALIDATE_RESPONSE_INDEX( e); |
---|
552 | |
---|
553 | while (true) { |
---|
554 | RTEMS_DEBUG_PRINT( "Search from %u to %u\n", r, response_size - 1); |
---|
555 | |
---|
556 | /* Search the data start token in in current response buffer */ |
---|
557 | retries -= (response_size - r); |
---|
558 | while (r < response_size) { |
---|
559 | RTEMS_DEBUG_PRINT( "Token [%02u]: 0x%02x\n", r, response [r]); |
---|
560 | if (response [r] == start_token) { |
---|
561 | /* Discard data start token */ |
---|
562 | ++r; |
---|
563 | goto sd_card_read_start; |
---|
564 | } else if (SD_CARD_IS_DATA_ERROR( response [r])) { |
---|
565 | RTEMS_SYSLOG_ERROR( "Data error token [%02i]: 0x%02" PRIx8 "\n", r, response [r]); |
---|
566 | return -RTEMS_IO_ERROR; |
---|
567 | } else if (response [r] != SD_CARD_IDLE_TOKEN) { |
---|
568 | RTEMS_SYSLOG_ERROR( "Unexpected token [%02i]: 0x%02" PRIx8 "\n", r, response [r]); |
---|
569 | return -RTEMS_IO_ERROR; |
---|
570 | } |
---|
571 | ++r; |
---|
572 | } |
---|
573 | |
---|
574 | if (retries <= 0) { |
---|
575 | RTEMS_SYSLOG_ERROR( "Timeout\n"); |
---|
576 | return -RTEMS_IO_ERROR; |
---|
577 | } |
---|
578 | |
---|
579 | if (e->schedule_if_busy) |
---|
580 | rtems_task_wake_after( RTEMS_YIELD_PROCESSOR); |
---|
581 | |
---|
582 | /* Query more. We typically have to wait between 10 and 100 |
---|
583 | bytes. To reduce overhead, read the response in chunks of |
---|
584 | 50 bytes - this doesn't introduce too much copy overhead |
---|
585 | but does allow SPI DMA transfers to work efficiently. */ |
---|
586 | response = in; |
---|
587 | response_size = 50; |
---|
588 | if (response_size > n) |
---|
589 | response_size = n; |
---|
590 | rv = sd_card_query( e, response, response_size); |
---|
591 | RTEMS_CHECK_RV( rv, "Query data start token"); |
---|
592 | |
---|
593 | /* Reset start position */ |
---|
594 | r = 0; |
---|
595 | } |
---|
596 | |
---|
597 | sd_card_read_start: |
---|
598 | |
---|
599 | /* Read data */ |
---|
600 | while (r < response_size && i < n) { |
---|
601 | in [i++] = response [r++]; |
---|
602 | } |
---|
603 | |
---|
604 | /* Read more data? */ |
---|
605 | if (i < n) { |
---|
606 | rv = sd_card_query( e, &in [i], n - i); |
---|
607 | RTEMS_CHECK_RV( rv, "Read data"); |
---|
608 | i += rv; |
---|
609 | } |
---|
610 | |
---|
611 | /* Read CRC 16 and N_RC */ |
---|
612 | rv = sd_card_query( e, e->response, 3); |
---|
613 | RTEMS_CHECK_RV( rv, "Read CRC 16"); |
---|
614 | |
---|
615 | crc16 = sd_card_compute_crc16 (in, n); |
---|
616 | if ((e->response[0] != ((crc16 >> 8) & 0xff)) || |
---|
617 | (e->response[1] != (crc16 & 0xff))) { |
---|
618 | RTEMS_SYSLOG_ERROR( "CRC check failed on read\n"); |
---|
619 | return -RTEMS_IO_ERROR; |
---|
620 | } |
---|
621 | |
---|
622 | return i; |
---|
623 | } |
---|
624 | |
---|
625 | static int sd_card_write( sd_card_driver_entry *e, uint8_t start_token, uint8_t *out, int n) |
---|
626 | { |
---|
627 | int rv = 0; |
---|
628 | uint8_t crc16_bytes [2] = { 0, 0 }; |
---|
629 | uint16_t crc16; |
---|
630 | |
---|
631 | /* Data output index */ |
---|
632 | int o = 0; |
---|
633 | |
---|
634 | /* Wait until card is not busy */ |
---|
635 | rv = sd_card_wait( e); |
---|
636 | RTEMS_CHECK_RV( rv, "Wait"); |
---|
637 | |
---|
638 | /* Write data start token */ |
---|
639 | rv = rtems_libi2c_write_bytes( e->bus, &start_token, 1); |
---|
640 | RTEMS_CHECK_RV( rv, "Write data start token"); |
---|
641 | |
---|
642 | /* Write data */ |
---|
643 | o = rtems_libi2c_write_bytes( e->bus, out, n); |
---|
644 | RTEMS_CHECK_RV( o, "Write data"); |
---|
645 | |
---|
646 | /* Write CRC 16 */ |
---|
647 | crc16 = sd_card_compute_crc16(out, n); |
---|
648 | crc16_bytes[0] = (crc16>>8) & 0xff; |
---|
649 | crc16_bytes[1] = (crc16) & 0xff; |
---|
650 | rv = rtems_libi2c_write_bytes( e->bus, crc16_bytes, 2); |
---|
651 | RTEMS_CHECK_RV( rv, "Write CRC 16"); |
---|
652 | |
---|
653 | /* Read data response */ |
---|
654 | rv = sd_card_query( e, e->response, 2); |
---|
655 | RTEMS_CHECK_RV( rv, "Read data response"); |
---|
656 | if (SD_CARD_IS_DATA_REJECTED( e->response [0])) { |
---|
657 | RTEMS_SYSLOG_ERROR( "Data rejected: 0x%02" PRIx8 "\n", e->response [0]); |
---|
658 | return -RTEMS_IO_ERROR; |
---|
659 | } |
---|
660 | |
---|
661 | /* Card is now busy */ |
---|
662 | e->busy = true; |
---|
663 | |
---|
664 | return o; |
---|
665 | } |
---|
666 | |
---|
667 | static inline rtems_status_code sd_card_start( sd_card_driver_entry *e) |
---|
668 | { |
---|
669 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
---|
670 | int rv = 0; |
---|
671 | |
---|
672 | sc = rtems_libi2c_send_start( e->bus); |
---|
673 | RTEMS_CHECK_SC( sc, "Send start"); |
---|
674 | |
---|
675 | rv = rtems_libi2c_ioctl( e->bus, RTEMS_LIBI2C_IOCTL_SET_TFRMODE, &e->transfer_mode); |
---|
676 | RTEMS_CHECK_RV_SC( rv, "Set transfer mode"); |
---|
677 | |
---|
678 | sc = rtems_libi2c_send_addr( e->bus, 1); |
---|
679 | RTEMS_CHECK_SC( sc, "Send address"); |
---|
680 | |
---|
681 | return RTEMS_SUCCESSFUL; |
---|
682 | } |
---|
683 | |
---|
684 | static inline rtems_status_code sd_card_stop( sd_card_driver_entry *e) |
---|
685 | { |
---|
686 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
---|
687 | |
---|
688 | sc = rtems_libi2c_send_stop( e->bus); |
---|
689 | RTEMS_CHECK_SC( sc, "Send stop"); |
---|
690 | |
---|
691 | return RTEMS_SUCCESSFUL; |
---|
692 | } |
---|
693 | |
---|
694 | static rtems_status_code sd_card_init( sd_card_driver_entry *e) |
---|
695 | { |
---|
696 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
---|
697 | int rv = 0; |
---|
698 | uint8_t block [SD_CARD_BLOCK_SIZE_DEFAULT]; |
---|
699 | uint32_t transfer_speed = 0; |
---|
700 | uint32_t read_block_size = 0; |
---|
701 | uint32_t write_block_size = 0; |
---|
702 | uint8_t csd_structure = 0; |
---|
703 | uint64_t capacity = 0; |
---|
704 | uint8_t crc7; |
---|
705 | |
---|
706 | /* Assume first that we have a SD card and not a MMC card */ |
---|
707 | bool assume_sd = true; |
---|
708 | |
---|
709 | /* |
---|
710 | * Assume high capacity until proven wrong (applies to SD and not yet |
---|
711 | * existing MMC). |
---|
712 | */ |
---|
713 | bool high_capacity = true; |
---|
714 | |
---|
715 | bool do_cmd58 = true; |
---|
716 | uint32_t cmd_arg = 0; |
---|
717 | uint32_t if_cond_test = SD_CARD_FLAG_VHS_2_7_TO_3_3 | SD_CARD_FLAG_CHECK_PATTERN; |
---|
718 | uint32_t if_cond_reg = if_cond_test; |
---|
719 | |
---|
720 | /* Start */ |
---|
721 | sc = sd_card_start( e); |
---|
722 | RTEMS_CLEANUP_SC( sc, sd_card_driver_init_cleanup, "Start"); |
---|
723 | |
---|
724 | /* Wait until card is not busy */ |
---|
725 | rv = sd_card_wait( e); |
---|
726 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Wait"); |
---|
727 | |
---|
728 | /* Send idle tokens for at least 74 clock cycles with active chip select */ |
---|
729 | memset( block, SD_CARD_IDLE_TOKEN, SD_CARD_BLOCK_SIZE_DEFAULT); |
---|
730 | rv = rtems_libi2c_write_bytes( e->bus, block, SD_CARD_BLOCK_SIZE_DEFAULT); |
---|
731 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Active chip select delay"); |
---|
732 | |
---|
733 | /* Stop */ |
---|
734 | sc = sd_card_stop( e); |
---|
735 | RTEMS_CHECK_SC( sc, "Stop"); |
---|
736 | |
---|
737 | /* Start with inactive chip select */ |
---|
738 | sc = rtems_libi2c_send_start( e->bus); |
---|
739 | RTEMS_CHECK_SC( sc, "Send start"); |
---|
740 | |
---|
741 | /* Set transfer mode */ |
---|
742 | rv = rtems_libi2c_ioctl( e->bus, RTEMS_LIBI2C_IOCTL_SET_TFRMODE, &e->transfer_mode); |
---|
743 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Set transfer mode"); |
---|
744 | |
---|
745 | /* Send idle tokens with inactive chip select */ |
---|
746 | rv = sd_card_query( e, e->response, SD_CARD_COMMAND_SIZE); |
---|
747 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Inactive chip select delay"); |
---|
748 | |
---|
749 | /* Activate chip select */ |
---|
750 | sc = rtems_libi2c_send_addr( e->bus, 1); |
---|
751 | RTEMS_CLEANUP_SC( sc, sd_card_driver_init_cleanup, "Send address"); |
---|
752 | |
---|
753 | /* Stop multiple block write */ |
---|
754 | sd_card_stop_multiple_block_write( e); |
---|
755 | |
---|
756 | /* Get card status */ |
---|
757 | sd_card_send_command( e, SD_CARD_CMD_SEND_STATUS, 0); |
---|
758 | |
---|
759 | /* Stop multiple block read */ |
---|
760 | sd_card_stop_multiple_block_read( e); |
---|
761 | |
---|
762 | /* Switch to SPI mode */ |
---|
763 | rv = sd_card_send_command( e, SD_CARD_CMD_GO_IDLE_STATE, 0); |
---|
764 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Send: SD_CARD_CMD_GO_IDLE_STATE"); |
---|
765 | |
---|
766 | /* |
---|
767 | * Get interface condition, CMD8. This is new for SD 2.x and enables |
---|
768 | * getting the High Capacity Support flag HCS and checks that the |
---|
769 | * voltage is right. Some MMCs accept this command but will still fail |
---|
770 | * on ACMD41. SD 1.x cards will fails this command and do not support |
---|
771 | * HCS (> 2G capacity). |
---|
772 | */ |
---|
773 | rv = sd_card_send_register_command( e, SD_CARD_CMD_SEND_IF_COND, if_cond_reg, &if_cond_reg); |
---|
774 | |
---|
775 | /* |
---|
776 | * Regardless of whether CMD8 above passes or fails, send ACMD41. If |
---|
777 | * card is MMC it will fail. But older SD < 2.0 (which fail CMD8) will |
---|
778 | * always stay "idle" if cmd_arg is non-zero, so set to 0 above on |
---|
779 | * fail. |
---|
780 | */ |
---|
781 | if (rv < 0) { |
---|
782 | /* Failed CMD8, so SD 1.x or MMC */ |
---|
783 | cmd_arg = 0; |
---|
784 | } else { |
---|
785 | cmd_arg = SD_CARD_FLAG_HCS; |
---|
786 | } |
---|
787 | |
---|
788 | /* Enable CRC */ |
---|
789 | sd_card_send_command( e, SD_CARD_CMD_CRC_ON_OFF, 1); |
---|
790 | |
---|
791 | /* Initialize card */ |
---|
792 | while (true) { |
---|
793 | if (assume_sd) { |
---|
794 | /* This command (CMD55) supported by SD and (most?) MMCs */ |
---|
795 | rv = sd_card_send_command( e, SD_CARD_CMD_APP_CMD, 0); |
---|
796 | if (rv < 0) { |
---|
797 | RTEMS_SYSLOG( "CMD55 failed. Assume MMC and try CMD1\n"); |
---|
798 | assume_sd = false; |
---|
799 | continue; |
---|
800 | } |
---|
801 | |
---|
802 | /* |
---|
803 | * This command (ACMD41) only supported by SD. Always |
---|
804 | * fails if MMC. |
---|
805 | */ |
---|
806 | rv = sd_card_send_command( e, SD_CARD_ACMD_SD_SEND_OP_COND, cmd_arg); |
---|
807 | if (rv < 0) { |
---|
808 | /* |
---|
809 | * This *will* fail for MMC. If fails, bad/no |
---|
810 | * card or card is MMC, do CMD58 then CMD1. |
---|
811 | */ |
---|
812 | RTEMS_SYSLOG( "ACMD41 failed. Assume MMC and do CMD58 (once) then CMD1\n"); |
---|
813 | assume_sd = false; |
---|
814 | cmd_arg = SD_CARD_FLAG_HCS; |
---|
815 | do_cmd58 = true; |
---|
816 | continue; |
---|
817 | } else { |
---|
818 | /* |
---|
819 | * Passed ACMD41 so SD. It is now save to |
---|
820 | * check if_cond_reg from CMD8. Reject the |
---|
821 | * card in case of a indicated bad voltage. |
---|
822 | */ |
---|
823 | if (if_cond_reg != if_cond_test) { |
---|
824 | RTEMS_CLEANUP_RV_SC( -1, sc, sd_card_driver_init_cleanup, "Bad voltage for SD"); |
---|
825 | } |
---|
826 | } |
---|
827 | } else { |
---|
828 | /* |
---|
829 | * Does not seem to be SD card. Do init for MMC. |
---|
830 | * First send CMD58 once to enable check for HCS |
---|
831 | * (similar to CMD8 of SD) with bits 30:29 set to 10b. |
---|
832 | * This will work for MMC >= 4.2. Older cards (<= 4.1) |
---|
833 | * may may not respond to CMD1 unless CMD58 is sent |
---|
834 | * again with zero argument. |
---|
835 | */ |
---|
836 | if (do_cmd58) { |
---|
837 | rv = sd_card_send_command( e, SD_CARD_CMD_READ_OCR, cmd_arg); |
---|
838 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Failed CMD58 for MMC"); |
---|
839 | |
---|
840 | /* A one-shot call */ |
---|
841 | do_cmd58 = false; |
---|
842 | } |
---|
843 | |
---|
844 | /* Do CMD1 */ |
---|
845 | rv = sd_card_send_command( e, SD_CARD_CMD_SEND_OP_COND, 0); |
---|
846 | if (rv < 0) { |
---|
847 | if (cmd_arg != 0) { |
---|
848 | /* |
---|
849 | * Send CMD58 again with zero argument |
---|
850 | * value. Proves card is not |
---|
851 | * high_capacity. |
---|
852 | */ |
---|
853 | cmd_arg = 0; |
---|
854 | do_cmd58 = true; |
---|
855 | high_capacity = false; |
---|
856 | continue; |
---|
857 | } |
---|
858 | |
---|
859 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Failed to initialize MMC"); |
---|
860 | } |
---|
861 | } |
---|
862 | |
---|
863 | /* |
---|
864 | * Not idle? |
---|
865 | * |
---|
866 | * This hangs forever if the card remains not idle and sends |
---|
867 | * always a valid response. |
---|
868 | */ |
---|
869 | if (SD_CARD_IS_NOT_IDLE_RESPONSE( e->response [e->response_index])) { |
---|
870 | break; |
---|
871 | } |
---|
872 | |
---|
873 | /* Invoke the scheduler */ |
---|
874 | rtems_task_wake_after( RTEMS_YIELD_PROCESSOR); |
---|
875 | } |
---|
876 | |
---|
877 | /* Now we know if we are SD or MMC */ |
---|
878 | if (assume_sd) { |
---|
879 | if (cmd_arg == 0) { |
---|
880 | /* SD is < 2.0 so never high capacity (<= 2G) */ |
---|
881 | high_capacity = 0; |
---|
882 | } else { |
---|
883 | uint32_t reg = 0; |
---|
884 | |
---|
885 | /* |
---|
886 | * SD is definitely 2.x. Now need to send CMD58 to get |
---|
887 | * the OCR to see if the HCS bit is set (capacity > 2G) |
---|
888 | * or if bit is off (capacity <= 2G, standard |
---|
889 | * capacity). |
---|
890 | */ |
---|
891 | rv = sd_card_send_register_command( e, SD_CARD_CMD_READ_OCR, 0, ®); |
---|
892 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Failed CMD58 for SD 2.x"); |
---|
893 | |
---|
894 | /* Check HCS bit of OCR */ |
---|
895 | high_capacity = (reg & SD_CARD_FLAG_HCS) != 0; |
---|
896 | } |
---|
897 | } else { |
---|
898 | /* |
---|
899 | * Card is MMC. Unless already proven to be not HCS (< 4.2) |
---|
900 | * must do CMD58 again to check the OCR bits 30:29. |
---|
901 | */ |
---|
902 | if (high_capacity) { |
---|
903 | uint32_t reg = 0; |
---|
904 | |
---|
905 | /* |
---|
906 | * The argument should still be correct since was never |
---|
907 | * set to 0 |
---|
908 | */ |
---|
909 | rv = sd_card_send_register_command( e, SD_CARD_CMD_READ_OCR, cmd_arg, ®); |
---|
910 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Failed CMD58 for MMC 4.2"); |
---|
911 | |
---|
912 | /* Check HCS bit of the OCR */ |
---|
913 | high_capacity = (reg & 0x600000) == SD_CARD_FLAG_HCS; |
---|
914 | } |
---|
915 | } |
---|
916 | |
---|
917 | /* Card Identification */ |
---|
918 | if (e->verbose) { |
---|
919 | rv = sd_card_send_command( e, SD_CARD_CMD_SEND_CID, 0); |
---|
920 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Send: SD_CARD_CMD_SEND_CID"); |
---|
921 | rv = sd_card_read( e, SD_CARD_START_BLOCK_SINGLE_BLOCK_READ, block, SD_CARD_CID_SIZE); |
---|
922 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Read: SD_CARD_CMD_SEND_CID"); |
---|
923 | RTEMS_SYSLOG( "*** Card Identification ***\n"); |
---|
924 | RTEMS_SYSLOG( "Manufacturer ID : %" PRIu8 "\n", SD_CARD_CID_GET_MID( block)); |
---|
925 | RTEMS_SYSLOG( "OEM/Application ID : %" PRIu16 "\n", SD_CARD_CID_GET_OID( block)); |
---|
926 | RTEMS_SYSLOG( |
---|
927 | "Product name : %c%c%c%c%c%c\n", |
---|
928 | SD_CARD_CID_GET_PNM( block, 0), |
---|
929 | SD_CARD_CID_GET_PNM( block, 1), |
---|
930 | SD_CARD_CID_GET_PNM( block, 2), |
---|
931 | SD_CARD_CID_GET_PNM( block, 3), |
---|
932 | SD_CARD_CID_GET_PNM( block, 4), |
---|
933 | SD_CARD_CID_GET_PNM( block, 5) |
---|
934 | ); |
---|
935 | RTEMS_SYSLOG( "Product revision : %" PRIu8 "\n", SD_CARD_CID_GET_PRV( block)); |
---|
936 | RTEMS_SYSLOG( "Product serial number : %" PRIu32 "\n", SD_CARD_CID_GET_PSN( block)); |
---|
937 | RTEMS_SYSLOG( "Manufacturing date : %" PRIu8 "\n", SD_CARD_CID_GET_MDT( block)); |
---|
938 | RTEMS_SYSLOG( "7-bit CRC checksum : %" PRIu8 "\n", SD_CARD_CID_GET_CRC7( block)); |
---|
939 | crc7 = sd_card_compute_crc7( block, 15); |
---|
940 | if (crc7 != SD_CARD_CID_GET_CRC7( block)) |
---|
941 | RTEMS_SYSLOG( " Failed! (computed %02" PRIx8 ")\n", crc7); |
---|
942 | } |
---|
943 | |
---|
944 | /* Card Specific Data */ |
---|
945 | |
---|
946 | /* Read CSD */ |
---|
947 | rv = sd_card_send_command( e, SD_CARD_CMD_SEND_CSD, 0); |
---|
948 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Send: SD_CARD_CMD_SEND_CSD"); |
---|
949 | rv = sd_card_read( e, SD_CARD_START_BLOCK_SINGLE_BLOCK_READ, block, SD_CARD_CSD_SIZE); |
---|
950 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Read: SD_CARD_CMD_SEND_CSD"); |
---|
951 | |
---|
952 | crc7 = sd_card_compute_crc7( block, 15); |
---|
953 | if (crc7 != SD_CARD_CID_GET_CRC7( block)) { |
---|
954 | RTEMS_SYSLOG( "SD_CARD_CMD_SEND_CSD CRC failed\n"); |
---|
955 | sc = RTEMS_IO_ERROR; |
---|
956 | goto sd_card_driver_init_cleanup; |
---|
957 | } |
---|
958 | |
---|
959 | /* CSD Structure */ |
---|
960 | csd_structure = SD_CARD_CSD_GET_CSD_STRUCTURE( block); |
---|
961 | |
---|
962 | /* Transfer speed and access time */ |
---|
963 | transfer_speed = sd_card_transfer_speed( block); |
---|
964 | e->transfer_mode.baudrate = transfer_speed; |
---|
965 | e->n_ac_max = sd_card_max_access_time( block, transfer_speed); |
---|
966 | |
---|
967 | /* Block sizes and capacity */ |
---|
968 | if (csd_structure == 0 || !assume_sd) { |
---|
969 | /* Treat MMC same as CSD Version 1.0 */ |
---|
970 | |
---|
971 | read_block_size = 1U << SD_CARD_CSD_GET_READ_BLK_LEN( block); |
---|
972 | e->block_size_shift = SD_CARD_CSD_GET_WRITE_BLK_LEN( block); |
---|
973 | write_block_size = 1U << e->block_size_shift; |
---|
974 | if (read_block_size < write_block_size) { |
---|
975 | RTEMS_SYSLOG_ERROR( "Read block size smaller than write block size\n"); |
---|
976 | return -RTEMS_IO_ERROR; |
---|
977 | } |
---|
978 | e->block_size = write_block_size; |
---|
979 | e->block_number = sd_card_block_number( block); |
---|
980 | capacity = sd_card_capacity( block); |
---|
981 | } else if (csd_structure == 1) { |
---|
982 | uint32_t c_size = SD_CARD_CSD_1_GET_C_SIZE( block); |
---|
983 | |
---|
984 | /* Block size is fixed in CSD Version 2.0 */ |
---|
985 | e->block_size_shift = 9; |
---|
986 | e->block_size = 512; |
---|
987 | |
---|
988 | e->block_number = (c_size + 1) * 1024; |
---|
989 | capacity = (c_size + 1) * 512 * 1024; |
---|
990 | read_block_size = 512; |
---|
991 | write_block_size = 512; |
---|
992 | |
---|
993 | /* Timeout is fixed at 100ms in CSD Version 2.0 */ |
---|
994 | e->n_ac_max = transfer_speed / 80; |
---|
995 | } else { |
---|
996 | RTEMS_DO_CLEANUP_SC( RTEMS_IO_ERROR, sc, sd_card_driver_init_cleanup, "Unexpected CSD Structure number"); |
---|
997 | } |
---|
998 | |
---|
999 | /* Print CSD information */ |
---|
1000 | if (e->verbose) { |
---|
1001 | RTEMS_SYSLOG( "*** Card Specific Data ***\n"); |
---|
1002 | RTEMS_SYSLOG( "CSD structure : %" PRIu8 "\n", SD_CARD_CSD_GET_CSD_STRUCTURE( block)); |
---|
1003 | RTEMS_SYSLOG( "Spec version : %" PRIu8 "\n", SD_CARD_CSD_GET_SPEC_VERS( block)); |
---|
1004 | RTEMS_SYSLOG( "Access time [ns] : %" PRIu32 "\n", sd_card_access_time( block)); |
---|
1005 | RTEMS_SYSLOG( "Access time [N] : %" PRIu32 "\n", SD_CARD_CSD_GET_NSAC( block)*100); |
---|
1006 | RTEMS_SYSLOG( "Max access time [N] : %" PRIu32 "\n", e->n_ac_max); |
---|
1007 | RTEMS_SYSLOG( "Max read block size [B] : %" PRIu32 "\n", read_block_size); |
---|
1008 | RTEMS_SYSLOG( "Max write block size [B] : %" PRIu32 "\n", write_block_size); |
---|
1009 | RTEMS_SYSLOG( "Block size [B] : %" PRIu32 "\n", e->block_size); |
---|
1010 | RTEMS_SYSLOG( "Block number : %" PRIu32 "\n", e->block_number); |
---|
1011 | RTEMS_SYSLOG( "Capacity [B] : %" PRIu64 "\n", capacity); |
---|
1012 | RTEMS_SYSLOG( "Max transfer speed [b/s] : %" PRIu32 "\n", transfer_speed); |
---|
1013 | } |
---|
1014 | |
---|
1015 | if (high_capacity) { |
---|
1016 | /* For high capacity cards the address is in blocks */ |
---|
1017 | e->block_size_shift = 0; |
---|
1018 | } else if (e->block_size_shift == 10) { |
---|
1019 | /* |
---|
1020 | * Low capacity 2GByte cards with reported block size of 1024 |
---|
1021 | * need to be set back to block size of 512 per 'Simplified |
---|
1022 | * Physical Layer Specification Version 2.0' section 4.3.2. |
---|
1023 | * Otherwise, CMD16 fails if set to 1024. |
---|
1024 | */ |
---|
1025 | e->block_size_shift = 9; |
---|
1026 | e->block_size = 512; |
---|
1027 | e->block_number *= 2; |
---|
1028 | } |
---|
1029 | |
---|
1030 | /* Set read block size */ |
---|
1031 | rv = sd_card_send_command( e, SD_CARD_CMD_SET_BLOCKLEN, e->block_size); |
---|
1032 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Send: SD_CARD_CMD_SET_BLOCKLEN"); |
---|
1033 | |
---|
1034 | /* Stop */ |
---|
1035 | sc = sd_card_stop( e); |
---|
1036 | RTEMS_CHECK_SC( sc, "Stop"); |
---|
1037 | |
---|
1038 | return RTEMS_SUCCESSFUL; |
---|
1039 | |
---|
1040 | sd_card_driver_init_cleanup: |
---|
1041 | |
---|
1042 | /* Stop */ |
---|
1043 | sd_card_stop( e); |
---|
1044 | |
---|
1045 | return sc; |
---|
1046 | } |
---|
1047 | /** @} */ |
---|
1048 | |
---|
1049 | /** |
---|
1050 | * @name Disk Driver Functions |
---|
1051 | * @{ |
---|
1052 | */ |
---|
1053 | |
---|
1054 | static int sd_card_disk_block_read( sd_card_driver_entry *e, rtems_blkdev_request *r) |
---|
1055 | { |
---|
1056 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
---|
1057 | int rv = 0; |
---|
1058 | uint32_t start_address = RTEMS_BLKDEV_START_BLOCK (r) << e->block_size_shift; |
---|
1059 | uint32_t i = 0; |
---|
1060 | |
---|
1061 | #ifdef DEBUG |
---|
1062 | /* Check request */ |
---|
1063 | if (r->bufs[0].block >= e->block_number) { |
---|
1064 | RTEMS_SYSLOG_ERROR( "Start block number out of range"); |
---|
1065 | return -RTEMS_INTERNAL_ERROR; |
---|
1066 | } else if (r->bufnum > e->block_number - RTEMS_BLKDEV_START_BLOCK (r)) { |
---|
1067 | RTEMS_SYSLOG_ERROR( "Block count out of range"); |
---|
1068 | return -RTEMS_INTERNAL_ERROR; |
---|
1069 | } |
---|
1070 | #endif /* DEBUG */ |
---|
1071 | |
---|
1072 | /* Start */ |
---|
1073 | sc = sd_card_start( e); |
---|
1074 | RTEMS_CLEANUP_SC_RV( sc, rv, sd_card_disk_block_read_cleanup, "Start"); |
---|
1075 | |
---|
1076 | if (r->bufnum == 1) { |
---|
1077 | #ifdef DEBUG |
---|
1078 | /* Check buffer */ |
---|
1079 | if (r->bufs [0].length != e->block_size) { |
---|
1080 | RTEMS_DO_CLEANUP_RV( -RTEMS_INTERNAL_ERROR, rv, sd_card_disk_block_read_cleanup, "Buffer and disk block size are not equal"); |
---|
1081 | } |
---|
1082 | RTEMS_DEBUG_PRINT( "[01:01]: buffer = 0x%08x, size = %u\n", r->bufs [0].buffer, r->bufs [0].length); |
---|
1083 | #endif /* DEBUG */ |
---|
1084 | |
---|
1085 | /* Single block read */ |
---|
1086 | rv = sd_card_send_command( e, SD_CARD_CMD_READ_SINGLE_BLOCK, start_address); |
---|
1087 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_cleanup, "Send: SD_CARD_CMD_READ_SINGLE_BLOCK"); |
---|
1088 | rv = sd_card_read( e, SD_CARD_START_BLOCK_SINGLE_BLOCK_READ, (uint8_t *) r->bufs [0].buffer, (int) e->block_size); |
---|
1089 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_cleanup, "Read: SD_CARD_CMD_READ_SINGLE_BLOCK"); |
---|
1090 | } else { |
---|
1091 | /* Start multiple block read */ |
---|
1092 | rv = sd_card_send_command( e, SD_CARD_CMD_READ_MULTIPLE_BLOCK, start_address); |
---|
1093 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_stop_cleanup, "Send: SD_CARD_CMD_READ_MULTIPLE_BLOCK"); |
---|
1094 | |
---|
1095 | /* Multiple block read */ |
---|
1096 | for (i = 0; i < r->bufnum; ++i) { |
---|
1097 | #ifdef DEBUG |
---|
1098 | /* Check buffer */ |
---|
1099 | if (r->bufs [i].length != e->block_size) { |
---|
1100 | RTEMS_DO_CLEANUP_RV( -RTEMS_INTERNAL_ERROR, rv, sd_card_disk_block_read_stop_cleanup, "Buffer and disk block size are not equal"); |
---|
1101 | } |
---|
1102 | RTEMS_DEBUG_PRINT( "[%02u:%02u]: buffer = 0x%08x, size = %u\n", i + 1, r->bufnum, r->bufs [i].buffer, r->bufs [i].length); |
---|
1103 | #endif /* DEBUG */ |
---|
1104 | |
---|
1105 | rv = sd_card_read( e, SD_CARD_START_BLOCK_MULTIPLE_BLOCK_READ, (uint8_t *) r->bufs [i].buffer, (int) e->block_size); |
---|
1106 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_stop_cleanup, "Read block"); |
---|
1107 | } |
---|
1108 | |
---|
1109 | /* Stop multiple block read */ |
---|
1110 | rv = sd_card_stop_multiple_block_read( e); |
---|
1111 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_cleanup, "Stop multiple block read"); |
---|
1112 | } |
---|
1113 | |
---|
1114 | /* Stop */ |
---|
1115 | sc = sd_card_stop( e); |
---|
1116 | RTEMS_CHECK_SC_RV( sc, "Stop"); |
---|
1117 | |
---|
1118 | /* Done */ |
---|
1119 | r->req_done( r->done_arg, RTEMS_SUCCESSFUL); |
---|
1120 | |
---|
1121 | return 0; |
---|
1122 | |
---|
1123 | sd_card_disk_block_read_stop_cleanup: |
---|
1124 | |
---|
1125 | /* Stop multiple block read */ |
---|
1126 | sd_card_stop_multiple_block_read( e); |
---|
1127 | |
---|
1128 | sd_card_disk_block_read_cleanup: |
---|
1129 | |
---|
1130 | /* Stop */ |
---|
1131 | sd_card_stop( e); |
---|
1132 | |
---|
1133 | /* Done */ |
---|
1134 | r->req_done( r->done_arg, RTEMS_IO_ERROR); |
---|
1135 | |
---|
1136 | return rv; |
---|
1137 | } |
---|
1138 | |
---|
1139 | static int sd_card_disk_block_write( sd_card_driver_entry *e, rtems_blkdev_request *r) |
---|
1140 | { |
---|
1141 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
---|
1142 | int rv = 0; |
---|
1143 | uint32_t start_address = RTEMS_BLKDEV_START_BLOCK (r) << e->block_size_shift; |
---|
1144 | uint32_t i = 0; |
---|
1145 | |
---|
1146 | #ifdef DEBUG |
---|
1147 | /* Check request */ |
---|
1148 | if (r->bufs[0].block >= e->block_number) { |
---|
1149 | RTEMS_SYSLOG_ERROR( "Start block number out of range"); |
---|
1150 | return -RTEMS_INTERNAL_ERROR; |
---|
1151 | } else if (r->bufnum > e->block_number - RTEMS_BLKDEV_START_BLOCK (r)) { |
---|
1152 | RTEMS_SYSLOG_ERROR( "Block count out of range"); |
---|
1153 | return -RTEMS_INTERNAL_ERROR; |
---|
1154 | } |
---|
1155 | #endif /* DEBUG */ |
---|
1156 | |
---|
1157 | /* Start */ |
---|
1158 | sc = sd_card_start( e); |
---|
1159 | RTEMS_CLEANUP_SC_RV( sc, rv, sd_card_disk_block_write_cleanup, "Start"); |
---|
1160 | |
---|
1161 | if (r->bufnum == 1) { |
---|
1162 | #ifdef DEBUG |
---|
1163 | /* Check buffer */ |
---|
1164 | if (r->bufs [0].length != e->block_size) { |
---|
1165 | RTEMS_DO_CLEANUP_RV( -RTEMS_INTERNAL_ERROR, rv, sd_card_disk_block_write_cleanup, "Buffer and disk block size are not equal"); |
---|
1166 | } |
---|
1167 | RTEMS_DEBUG_PRINT( "[01:01]: buffer = 0x%08x, size = %u\n", r->bufs [0].buffer, r->bufs [0].length); |
---|
1168 | #endif /* DEBUG */ |
---|
1169 | |
---|
1170 | /* Single block write */ |
---|
1171 | rv = sd_card_send_command( e, SD_CARD_CMD_WRITE_BLOCK, start_address); |
---|
1172 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_cleanup, "Send: SD_CARD_CMD_WRITE_BLOCK"); |
---|
1173 | rv = sd_card_write( e, SD_CARD_START_BLOCK_SINGLE_BLOCK_WRITE, (uint8_t *) r->bufs [0].buffer, (int) e->block_size); |
---|
1174 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_cleanup, "Write: SD_CARD_CMD_WRITE_BLOCK"); |
---|
1175 | } else { |
---|
1176 | /* Start multiple block write */ |
---|
1177 | rv = sd_card_send_command( e, SD_CARD_CMD_WRITE_MULTIPLE_BLOCK, start_address); |
---|
1178 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_stop_cleanup, "Send: SD_CARD_CMD_WRITE_MULTIPLE_BLOCK"); |
---|
1179 | |
---|
1180 | /* Multiple block write */ |
---|
1181 | for (i = 0; i < r->bufnum; ++i) { |
---|
1182 | #ifdef DEBUG |
---|
1183 | /* Check buffer */ |
---|
1184 | if (r->bufs [i].length != e->block_size) { |
---|
1185 | RTEMS_DO_CLEANUP_RV( -RTEMS_INTERNAL_ERROR, rv, sd_card_disk_block_write_stop_cleanup, "Buffer and disk block size are not equal"); |
---|
1186 | } |
---|
1187 | RTEMS_DEBUG_PRINT( "[%02u:%02u]: buffer = 0x%08x, size = %u\n", i + 1, r->bufnum, r->bufs [i].buffer, r->bufs [i].length); |
---|
1188 | #endif /* DEBUG */ |
---|
1189 | |
---|
1190 | rv = sd_card_write( e, SD_CARD_START_BLOCK_MULTIPLE_BLOCK_WRITE, (uint8_t *) r->bufs [i].buffer, (int) e->block_size); |
---|
1191 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_stop_cleanup, "Write block"); |
---|
1192 | } |
---|
1193 | |
---|
1194 | /* Stop multiple block write */ |
---|
1195 | rv = sd_card_stop_multiple_block_write( e); |
---|
1196 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_cleanup, "Stop multiple block write"); |
---|
1197 | } |
---|
1198 | |
---|
1199 | /* Get card status */ |
---|
1200 | rv = sd_card_send_command( e, SD_CARD_CMD_SEND_STATUS, 0); |
---|
1201 | RTEMS_CHECK_RV( rv, "Send: SD_CARD_CMD_SEND_STATUS"); |
---|
1202 | |
---|
1203 | /* Stop */ |
---|
1204 | sc = sd_card_stop( e); |
---|
1205 | RTEMS_CHECK_SC_RV( sc, "Stop"); |
---|
1206 | |
---|
1207 | /* Done */ |
---|
1208 | r->req_done( r->done_arg, RTEMS_SUCCESSFUL); |
---|
1209 | |
---|
1210 | return 0; |
---|
1211 | |
---|
1212 | sd_card_disk_block_write_stop_cleanup: |
---|
1213 | |
---|
1214 | /* Stop multiple block write */ |
---|
1215 | sd_card_stop_multiple_block_write( e); |
---|
1216 | |
---|
1217 | sd_card_disk_block_write_cleanup: |
---|
1218 | |
---|
1219 | /* Get card status */ |
---|
1220 | rv = sd_card_send_command( e, SD_CARD_CMD_SEND_STATUS, 0); |
---|
1221 | RTEMS_CHECK_RV( rv, "Send: SD_CARD_CMD_SEND_STATUS"); |
---|
1222 | |
---|
1223 | /* Stop */ |
---|
1224 | sd_card_stop( e); |
---|
1225 | |
---|
1226 | /* Done */ |
---|
1227 | r->req_done( r->done_arg, RTEMS_IO_ERROR); |
---|
1228 | |
---|
1229 | return rv; |
---|
1230 | } |
---|
1231 | |
---|
1232 | static int sd_card_disk_ioctl( rtems_disk_device *dd, uint32_t req, void *arg) |
---|
1233 | { |
---|
1234 | RTEMS_DEBUG_PRINT( "dev = %u, req = %u, arg = 0x08%x\n", dev, req, arg); |
---|
1235 | if (req == RTEMS_BLKIO_REQUEST) { |
---|
1236 | rtems_device_minor_number minor = rtems_disk_get_minor_number( dd); |
---|
1237 | sd_card_driver_entry *e = &sd_card_driver_table [minor]; |
---|
1238 | rtems_blkdev_request *r = (rtems_blkdev_request *) arg; |
---|
1239 | int (*f)( sd_card_driver_entry *, rtems_blkdev_request *); |
---|
1240 | uint32_t retries = e->retries; |
---|
1241 | int result; |
---|
1242 | |
---|
1243 | switch (r->req) { |
---|
1244 | case RTEMS_BLKDEV_REQ_READ: |
---|
1245 | f = sd_card_disk_block_read; |
---|
1246 | break; |
---|
1247 | case RTEMS_BLKDEV_REQ_WRITE: |
---|
1248 | f = sd_card_disk_block_write; |
---|
1249 | break; |
---|
1250 | default: |
---|
1251 | errno = EINVAL; |
---|
1252 | return -1; |
---|
1253 | } |
---|
1254 | do { |
---|
1255 | result = f( e, r); |
---|
1256 | } while (retries-- > 0 && result != 0); |
---|
1257 | return result; |
---|
1258 | |
---|
1259 | } else if (req == RTEMS_BLKIO_CAPABILITIES) { |
---|
1260 | *(uint32_t *) arg = RTEMS_BLKDEV_CAP_MULTISECTOR_CONT; |
---|
1261 | return 0; |
---|
1262 | } else { |
---|
1263 | errno = EINVAL; |
---|
1264 | return -1; |
---|
1265 | } |
---|
1266 | } |
---|
1267 | |
---|
1268 | static rtems_status_code sd_card_disk_init( rtems_device_major_number major, rtems_device_minor_number minor, void *arg) |
---|
1269 | { |
---|
1270 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
---|
1271 | |
---|
1272 | /* Initialize disk IO */ |
---|
1273 | sc = rtems_disk_io_initialize(); |
---|
1274 | RTEMS_CHECK_SC( sc, "Initialize RTEMS disk IO"); |
---|
1275 | |
---|
1276 | for (minor = 0; minor < sd_card_driver_table_size; ++minor) { |
---|
1277 | sd_card_driver_entry *e = &sd_card_driver_table [minor]; |
---|
1278 | dev_t dev = rtems_filesystem_make_dev_t( major, minor); |
---|
1279 | uint32_t retries = e->retries; |
---|
1280 | |
---|
1281 | /* Initialize SD Card */ |
---|
1282 | do { |
---|
1283 | sc = sd_card_init( e); |
---|
1284 | } while (retries-- > 0 && sc != RTEMS_SUCCESSFUL); |
---|
1285 | RTEMS_CHECK_SC( sc, "Initialize SD Card"); |
---|
1286 | |
---|
1287 | /* Create disk device */ |
---|
1288 | sc = rtems_disk_create_phys( dev, e->block_size, e->block_number, sd_card_disk_ioctl, NULL, e->device_name); |
---|
1289 | RTEMS_CHECK_SC( sc, "Create disk device"); |
---|
1290 | } |
---|
1291 | |
---|
1292 | return RTEMS_SUCCESSFUL; |
---|
1293 | } |
---|
1294 | |
---|
1295 | /** @} */ |
---|
1296 | |
---|
1297 | static const rtems_driver_address_table sd_card_disk_ops = { |
---|
1298 | .initialization_entry = sd_card_disk_init, |
---|
1299 | .open_entry = rtems_blkdev_generic_open, |
---|
1300 | .close_entry = rtems_blkdev_generic_close, |
---|
1301 | .read_entry = rtems_blkdev_generic_read, |
---|
1302 | .write_entry = rtems_blkdev_generic_write, |
---|
1303 | .control_entry = rtems_blkdev_generic_ioctl |
---|
1304 | }; |
---|
1305 | |
---|
1306 | rtems_status_code sd_card_register( void) |
---|
1307 | { |
---|
1308 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
---|
1309 | rtems_device_major_number major = 0; |
---|
1310 | |
---|
1311 | sc = rtems_io_register_driver( 0, &sd_card_disk_ops, &major); |
---|
1312 | RTEMS_CHECK_SC( sc, "Register disk SD Card driver"); |
---|
1313 | |
---|
1314 | return RTEMS_SUCCESSFUL; |
---|
1315 | } |
---|