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 |
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16 | * found in the file LICENSE in this distribution or at |
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17 | * http://www.rtems.com/license/LICENSE. |
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18 | */ |
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19 | |
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20 | #include <stdio.h> |
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21 | #include <string.h> |
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22 | #include <errno.h> |
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23 | #include <inttypes.h> |
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24 | |
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25 | #include <rtems.h> |
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26 | #include <rtems/libi2c.h> |
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27 | #include <rtems/libio.h> |
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28 | #include <rtems/diskdevs.h> |
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29 | #include <rtems/blkdev.h> |
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30 | |
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31 | #include <libchip/spi-sd-card.h> |
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32 | |
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33 | #include <rtems/status-checks.h> |
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34 | |
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35 | /** |
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36 | * @name Integer to and from Byte-Stream Converter |
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37 | * @{ |
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38 | */ |
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39 | |
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40 | static inline uint16_t sd_card_get_uint16( const uint8_t *s) |
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41 | { |
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42 | return (uint16_t) ((s [0] << 8) | s [1]); |
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43 | } |
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44 | |
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45 | static inline uint32_t sd_card_get_uint32( const uint8_t *s) |
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46 | { |
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47 | return ((uint32_t) s [0] << 24) | ((uint32_t) s [1] << 16) | ((uint32_t) s [2] << 8) | (uint32_t) s [3]; |
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48 | } |
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49 | |
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50 | static inline void sd_card_put_uint16( uint16_t v, uint8_t *s) |
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51 | { |
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52 | *s++ = (uint8_t) (v >> 8); |
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53 | *s = (uint8_t) (v); |
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54 | } |
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55 | |
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56 | static inline void sd_card_put_uint32( uint32_t v, uint8_t *s) |
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57 | { |
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58 | *s++ = (uint8_t) (v >> 24); |
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59 | *s++ = (uint8_t) (v >> 16); |
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60 | *s++ = (uint8_t) (v >> 8); |
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61 | *s = (uint8_t) (v); |
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62 | } |
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63 | |
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64 | /** @} */ |
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65 | |
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66 | #define SD_CARD_BUSY_TOKEN 0 |
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67 | |
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68 | #define SD_CARD_BLOCK_SIZE_DEFAULT 512 |
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69 | |
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70 | #define SD_CARD_COMMAND_RESPONSE_START 7 |
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71 | |
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72 | /** |
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73 | * @name Commands |
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74 | * @{ |
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75 | */ |
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76 | |
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77 | #define SD_CARD_CMD_GO_IDLE_STATE 0 |
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78 | #define SD_CARD_CMD_SEND_OP_COND 1 |
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79 | #define SD_CARD_CMD_SEND_IF_COND 8 |
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80 | #define SD_CARD_CMD_SEND_CSD 9 |
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81 | #define SD_CARD_CMD_SEND_CID 10 |
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82 | #define SD_CARD_CMD_STOP_TRANSMISSION 12 |
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83 | #define SD_CARD_CMD_SEND_STATUS 13 |
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84 | #define SD_CARD_CMD_SET_BLOCKLEN 16 |
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85 | #define SD_CARD_CMD_READ_SINGLE_BLOCK 17 |
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86 | #define SD_CARD_CMD_READ_MULTIPLE_BLOCK 18 |
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87 | #define SD_CARD_CMD_SET_BLOCK_COUNT 23 |
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88 | #define SD_CARD_CMD_WRITE_BLOCK 24 |
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89 | #define SD_CARD_CMD_WRITE_MULTIPLE_BLOCK 25 |
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90 | #define SD_CARD_CMD_PROGRAM_CSD 27 |
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91 | #define SD_CARD_CMD_SET_WRITE_PROT 28 |
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92 | #define SD_CARD_CMD_CLR_WRITE_PROT 29 |
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93 | #define SD_CARD_CMD_SEND_WRITE_PROT 30 |
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94 | #define SD_CARD_CMD_TAG_SECTOR_START 32 |
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95 | #define SD_CARD_CMD_TAG_SECTOR_END 33 |
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96 | #define SD_CARD_CMD_UNTAG_SECTOR 34 |
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97 | #define SD_CARD_CMD_TAG_ERASE_GROUP_START 35 |
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98 | #define SD_CARD_CMD_TAG_ERASE_GROUP_END 36 |
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99 | #define SD_CARD_CMD_UNTAG_ERASE_GROUP 37 |
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100 | #define SD_CARD_CMD_ERASE 38 |
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101 | #define SD_CARD_CMD_LOCK_UNLOCK 42 |
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102 | #define SD_CARD_CMD_APP_CMD 55 |
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103 | #define SD_CARD_CMD_GEN_CND 56 |
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104 | #define SD_CARD_CMD_READ_OCR 58 |
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105 | #define SD_CARD_CMD_CRC_ON_OFF 59 |
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106 | |
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107 | /** @} */ |
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108 | |
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109 | /** |
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110 | * @name Application Commands |
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111 | * @{ |
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112 | */ |
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113 | |
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114 | #define SD_CARD_ACMD_SD_SEND_OP_COND 41 |
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115 | |
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116 | /** @} */ |
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117 | |
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118 | /** |
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119 | * @name Command Flags |
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120 | * @{ |
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121 | */ |
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122 | |
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123 | #define SD_CARD_FLAG_HCS 0x40000000U |
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124 | |
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125 | #define SD_CARD_FLAG_VHS_2_7_TO_3_3 0x00000100U |
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126 | |
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127 | #define SD_CARD_FLAG_CHECK_PATTERN 0x000000aaU |
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128 | |
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129 | /** @} */ |
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130 | |
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131 | /** |
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132 | * @name Command Fields |
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133 | * @{ |
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134 | */ |
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135 | |
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136 | #define SD_CARD_COMMAND_SET_COMMAND( c, cmd) (c) [1] = (uint8_t) (0x40 + ((cmd) & 0x3f)) |
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137 | |
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138 | #define SD_CARD_COMMAND_SET_ARGUMENT( c, arg) sd_card_put_uint32( (arg), &((c) [2])) |
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139 | |
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140 | #define SD_CARD_COMMAND_SET_CRC7( c, crc7) ((c) [6] = ((crc7) << 1) | 1U) |
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141 | |
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142 | #define SD_CARD_COMMAND_GET_CRC7( c) ((c) [6] >> 1) |
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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 | * @name Response Fields |
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148 | * @{ |
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149 | */ |
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150 | |
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151 | #define SD_CARD_IS_RESPONSE( r) (((r) & 0x80) == 0) |
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152 | |
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153 | #define SD_CARD_IS_ERRORLESS_RESPONSE( r) (((r) & 0x7e) == 0) |
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154 | |
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155 | #define SD_CARD_IS_NOT_IDLE_RESPONSE( r) (((r) & 0x81) == 0) |
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156 | |
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157 | #define SD_CARD_IS_DATA_ERROR( r) (((r) & 0xe0) == 0) |
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158 | |
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159 | #define SD_CARD_IS_DATA_REJECTED( r) (((r) & 0x1f) != 0x05) |
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160 | |
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161 | /** @} */ |
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162 | |
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163 | /** |
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164 | * @name Card Identification |
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165 | * @{ |
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166 | */ |
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167 | |
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168 | #define SD_CARD_CID_SIZE 16 |
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169 | |
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170 | #define SD_CARD_CID_GET_MID( cid) ((cid) [0]) |
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171 | #define SD_CARD_CID_GET_OID( cid) sd_card_get_uint16( cid + 1) |
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172 | #define SD_CARD_CID_GET_PNM( cid, i) ((char) (cid) [3 + (i)]) |
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173 | #define SD_CARD_CID_GET_PRV( cid) ((cid) [9]) |
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174 | #define SD_CARD_CID_GET_PSN( cid) sd_card_get_uint32( cid + 10) |
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175 | #define SD_CARD_CID_GET_MDT( cid) ((cid) [14]) |
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176 | #define SD_CARD_CID_GET_CRC7( cid) ((cid) [15] >> 1) |
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177 | |
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178 | /** @} */ |
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179 | |
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180 | /** |
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181 | * @name Card Specific Data |
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182 | * @{ |
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183 | */ |
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184 | |
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185 | #define SD_CARD_CSD_SIZE 16 |
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186 | |
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187 | #define SD_CARD_CSD_GET_CSD_STRUCTURE( csd) ((csd) [0] >> 6) |
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188 | #define SD_CARD_CSD_GET_SPEC_VERS( csd) (((csd) [0] >> 2) & 0xf) |
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189 | #define SD_CARD_CSD_GET_TAAC( csd) ((csd) [1]) |
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190 | #define SD_CARD_CSD_GET_NSAC( csd) ((uint32_t) (csd) [2]) |
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191 | #define SD_CARD_CSD_GET_TRAN_SPEED( csd) ((csd) [3]) |
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192 | #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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193 | #define SD_CARD_CSD_GET_C_SIZE_MULT( csd) ((((csd) [9] & 0x3) << 1) + (((csd) [10] >> 7) & 0x1)) |
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194 | #define SD_CARD_CSD_GET_READ_BLK_LEN( csd) ((uint32_t) (csd) [5] & 0xf) |
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195 | #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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196 | #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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197 | |
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198 | /** @} */ |
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199 | |
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200 | #define SD_CARD_INVALIDATE_RESPONSE_INDEX( e) e->response_index = SD_CARD_COMMAND_SIZE |
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201 | |
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202 | /** |
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203 | * @name Data Start and Stop Tokens |
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204 | * @{ |
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205 | */ |
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206 | |
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207 | #define SD_CARD_START_BLOCK_SINGLE_BLOCK_READ 0xfe |
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208 | #define SD_CARD_START_BLOCK_MULTIPLE_BLOCK_READ 0xfe |
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209 | #define SD_CARD_START_BLOCK_SINGLE_BLOCK_WRITE 0xfe |
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210 | #define SD_CARD_START_BLOCK_MULTIPLE_BLOCK_WRITE 0xfc |
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211 | #define SD_CARD_STOP_TRANSFER_MULTIPLE_BLOCK_WRITE 0xfd |
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212 | |
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213 | /** @} */ |
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214 | |
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215 | /** |
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216 | * @name Card Specific Data Functions |
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217 | * @{ |
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218 | */ |
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219 | |
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220 | static inline uint32_t sd_card_block_number( const uint8_t *csd) |
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221 | { |
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222 | uint32_t size = SD_CARD_CSD_GET_C_SIZE( csd); |
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223 | uint32_t mult = 1U << (SD_CARD_CSD_GET_C_SIZE_MULT( csd) + 2); |
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224 | return (size + 1) * mult; |
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225 | } |
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226 | |
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227 | static inline uint32_t sd_card_capacity( const uint8_t *csd) |
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228 | { |
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229 | uint32_t block_size = 1U << SD_CARD_CSD_GET_READ_BLK_LEN( csd); |
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230 | return sd_card_block_number( csd) * block_size; |
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231 | } |
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232 | |
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233 | static inline uint32_t sd_card_transfer_speed( const uint8_t *csd) |
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234 | { |
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235 | uint32_t s = SD_CARD_CSD_GET_TRAN_SPEED( csd); |
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236 | uint32_t e = s & 0x7; |
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237 | uint32_t m = s >> 3; |
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238 | switch (e) { |
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239 | case 0: s = 10000; break; |
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240 | case 1: s = 100000; break; |
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241 | case 2: s = 1000000; break; |
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242 | case 3: s = 10000000; break; |
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243 | default: s = 0; break; |
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244 | } |
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245 | switch (m) { |
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246 | case 1: s *= 10; break; |
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247 | case 2: s *= 12; break; |
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248 | case 3: s *= 13; break; |
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249 | case 4: s *= 15; break; |
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250 | case 5: s *= 20; break; |
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251 | case 6: s *= 25; break; |
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252 | case 7: s *= 30; break; |
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253 | case 8: s *= 35; break; |
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254 | case 9: s *= 40; break; |
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255 | case 10: s *= 45; break; |
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256 | case 11: s *= 50; break; |
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257 | case 12: s *= 55; break; |
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258 | case 13: s *= 60; break; |
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259 | case 14: s *= 70; break; |
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260 | case 15: s *= 80; break; |
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261 | default: s *= 0; break; |
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262 | } |
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263 | return s; |
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264 | } |
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265 | |
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266 | static inline uint32_t sd_card_access_time( const uint8_t *csd) |
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267 | { |
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268 | uint32_t ac = SD_CARD_CSD_GET_TAAC( csd); |
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269 | uint32_t e = ac & 0x7; |
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270 | uint32_t m = ac >> 3; |
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271 | switch (e) { |
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272 | case 0: ac = 1; break; |
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273 | case 1: ac = 10; break; |
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274 | case 2: ac = 100; break; |
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275 | case 3: ac = 1000; break; |
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276 | case 4: ac = 10000; break; |
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277 | case 5: ac = 100000; break; |
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278 | case 6: ac = 1000000; break; |
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279 | case 7: ac = 10000000; break; |
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280 | default: ac = 0; break; |
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281 | } |
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282 | switch (m) { |
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283 | case 1: ac *= 10; break; |
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284 | case 2: ac *= 12; break; |
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285 | case 3: ac *= 13; break; |
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286 | case 4: ac *= 15; break; |
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287 | case 5: ac *= 20; break; |
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288 | case 6: ac *= 25; break; |
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289 | case 7: ac *= 30; break; |
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290 | case 8: ac *= 35; break; |
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291 | case 9: ac *= 40; break; |
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292 | case 10: ac *= 45; break; |
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293 | case 11: ac *= 50; break; |
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294 | case 12: ac *= 55; break; |
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295 | case 13: ac *= 60; break; |
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296 | case 14: ac *= 70; break; |
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297 | case 15: ac *= 80; break; |
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298 | default: ac *= 0; break; |
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299 | } |
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300 | return ac / 10; |
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301 | } |
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302 | |
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303 | static inline uint32_t sd_card_max_access_time( const uint8_t *csd, uint32_t transfer_speed) |
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304 | { |
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305 | uint64_t ac = sd_card_access_time( csd); |
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306 | uint32_t ac_100ms = transfer_speed / 80; |
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307 | uint32_t n = SD_CARD_CSD_GET_NSAC( csd) * 100; |
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308 | /* ac is in ns, transfer_speed in bps, max_access_time in bytes. |
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309 | max_access_time is 100 times typical access time (taac+nsac) */ |
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310 | ac = ac * transfer_speed / 80000000; |
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311 | ac = ac + 100*n; |
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312 | if ((uint32_t)ac > ac_100ms) |
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313 | return ac_100ms; |
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314 | else |
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315 | return (uint32_t)ac; |
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316 | } |
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317 | |
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318 | /** @} */ |
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319 | |
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320 | /** |
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321 | * @name CRC functions |
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322 | * |
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323 | * Based on http://en.wikipedia.org/wiki/Computation_of_CRC |
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324 | * |
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325 | * @{ |
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326 | */ |
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327 | |
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328 | static uint8_t sd_card_compute_crc7 (uint8_t *data, size_t len) |
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329 | { |
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330 | uint8_t e, f, crc; |
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331 | size_t i; |
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332 | |
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333 | crc = 0; |
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334 | for (i = 0; i < len; i++) { |
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335 | e = crc ^ data[i]; |
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336 | f = e ^ (e >> 4) ^ (e >> 7); |
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337 | crc = (f << 1) ^ (f << 4); |
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338 | } |
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339 | return crc >> 1; |
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340 | } |
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341 | |
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342 | static uint16_t sd_card_compute_crc16 (uint8_t *data, size_t len) |
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343 | { |
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344 | uint8_t s, t; |
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345 | uint16_t crc; |
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346 | size_t i; |
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347 | |
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348 | crc = 0; |
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349 | for (i = 0; i < len; i++) { |
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350 | s = data[i] ^ (crc >> 8); |
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351 | t = s ^ (s >> 4); |
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352 | crc = (crc << 8) ^ t ^ (t << 5) ^ (t << 12); |
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353 | } |
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354 | return crc; |
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355 | } |
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356 | |
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357 | /** @} */ |
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358 | |
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359 | /** |
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360 | * @name Communication Functions |
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361 | * @{ |
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362 | */ |
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363 | |
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364 | static inline int sd_card_query( sd_card_driver_entry *e, uint8_t *in, int n) |
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365 | { |
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366 | return rtems_libi2c_read_bytes( e->bus, in, n); |
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367 | } |
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368 | |
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369 | static int sd_card_wait( sd_card_driver_entry *e) |
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370 | { |
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371 | int rv = 0; |
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372 | int r = 0; |
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373 | int n = 2; |
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374 | /* For writes, the timeout is 2.5 times that of reads; since we |
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375 | don't know if it is a write or read, assume write. |
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376 | FIXME should actually look at R2W_FACTOR for non-HC cards. */ |
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377 | int retries = e->n_ac_max * 25 / 10; |
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378 | /* n_ac_max/100 is supposed to be the average waiting time. To |
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379 | approximate this, we start with waiting n_ac_max/150 and |
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380 | gradually increase the waiting time. */ |
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381 | int wait_time_bytes = (retries + 149) / 150; |
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382 | while (e->busy) { |
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383 | /* Query busy tokens */ |
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384 | rv = sd_card_query( e, e->response, n); |
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385 | RTEMS_CHECK_RV( rv, "Busy"); |
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386 | |
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387 | /* Search for non busy tokens */ |
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388 | for (r = 0; r < n; ++r) { |
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389 | if (e->response [r] != SD_CARD_BUSY_TOKEN) { |
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390 | e->busy = false; |
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391 | return 0; |
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392 | } |
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393 | } |
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394 | retries -= n; |
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395 | if (retries <= 0) { |
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396 | return -RTEMS_TIMEOUT; |
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397 | } |
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398 | |
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399 | if (e->schedule_if_busy) { |
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400 | uint64_t wait_time_us = wait_time_bytes; |
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401 | wait_time_us *= 8000000; |
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402 | wait_time_us /= e->transfer_mode.baudrate; |
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403 | rtems_task_wake_after( RTEMS_MICROSECONDS_TO_TICKS(wait_time_us)); |
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404 | retries -= wait_time_bytes; |
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405 | wait_time_bytes = wait_time_bytes * 15 / 10; |
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406 | } else { |
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407 | n = SD_CARD_COMMAND_SIZE; |
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408 | } |
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409 | } |
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410 | return 0; |
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411 | } |
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412 | |
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413 | static int sd_card_send_command( sd_card_driver_entry *e, uint32_t command, uint32_t argument) |
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414 | { |
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415 | int rv = 0; |
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416 | rtems_libi2c_read_write_t rw = { |
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417 | .rd_buf = e->response, |
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418 | .wr_buf = e->command, |
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419 | .byte_cnt = SD_CARD_COMMAND_SIZE |
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420 | }; |
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421 | int r = 0; |
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422 | uint8_t crc7; |
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423 | |
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424 | SD_CARD_INVALIDATE_RESPONSE_INDEX( e); |
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425 | |
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426 | /* Wait until card is not busy */ |
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427 | rv = sd_card_wait( e); |
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428 | RTEMS_CHECK_RV( rv, "Wait"); |
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429 | |
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430 | /* Write command and read response */ |
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431 | SD_CARD_COMMAND_SET_COMMAND( e->command, command); |
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432 | SD_CARD_COMMAND_SET_ARGUMENT( e->command, argument); |
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433 | crc7 = sd_card_compute_crc7( e->command + 1, 5); |
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434 | SD_CARD_COMMAND_SET_CRC7( e->command, crc7); |
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435 | rv = rtems_libi2c_ioctl( e->bus, RTEMS_LIBI2C_IOCTL_READ_WRITE, &rw); |
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436 | RTEMS_CHECK_RV( rv, "Write command and read response"); |
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437 | |
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438 | /* Check respose */ |
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439 | for (r = SD_CARD_COMMAND_RESPONSE_START; r < SD_CARD_COMMAND_SIZE; ++r) { |
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440 | RTEMS_DEBUG_PRINT( "Token [%02u]: 0x%02x\n", r, e->response [r]); |
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441 | e->response_index = r; |
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442 | if (SD_CARD_IS_RESPONSE( e->response [r])) { |
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443 | if (SD_CARD_IS_ERRORLESS_RESPONSE( e->response [r])) { |
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444 | return 0; |
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445 | } else { |
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446 | RTEMS_SYSLOG_ERROR( "Command error [%02i]: 0x%02" PRIx8 "\n", r, e->response [r]); |
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447 | goto sd_card_send_command_error; |
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448 | } |
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449 | } else if (e->response [r] != SD_CARD_IDLE_TOKEN) { |
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450 | RTEMS_SYSLOG_ERROR( "Unexpected token [%02i]: 0x%02" PRIx8 "\n", r, e->response [r]); |
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451 | goto sd_card_send_command_error; |
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452 | } |
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453 | } |
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454 | |
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455 | RTEMS_SYSLOG_ERROR( "Timeout\n"); |
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456 | |
---|
457 | sd_card_send_command_error: |
---|
458 | |
---|
459 | RTEMS_SYSLOG_ERROR( "Response:"); |
---|
460 | for (r = 0; r < SD_CARD_COMMAND_SIZE; ++r) { |
---|
461 | if (e->response_index == r) { |
---|
462 | RTEMS_SYSLOG_PRINT( " %02" PRIx8 ":[%02" PRIx8 "]", e->command [r], e->response [r]); |
---|
463 | } else { |
---|
464 | RTEMS_SYSLOG_PRINT( " %02" PRIx8 ":%02" PRIx8 "", e->command [r], e->response [r]); |
---|
465 | } |
---|
466 | } |
---|
467 | RTEMS_SYSLOG_PRINT( "\n"); |
---|
468 | |
---|
469 | return -RTEMS_IO_ERROR; |
---|
470 | } |
---|
471 | |
---|
472 | static int sd_card_send_register_command( sd_card_driver_entry *e, uint32_t command, uint32_t argument, uint32_t *reg) |
---|
473 | { |
---|
474 | int rv = 0; |
---|
475 | uint8_t crc7; |
---|
476 | |
---|
477 | rv = sd_card_send_command( e, command, argument); |
---|
478 | RTEMS_CHECK_RV( rv, "Send command"); |
---|
479 | |
---|
480 | if (e->response_index + 5 > SD_CARD_COMMAND_SIZE) { |
---|
481 | /* |
---|
482 | * TODO: If this happens in the wild we need to implement a |
---|
483 | * more sophisticated response query. |
---|
484 | */ |
---|
485 | RTEMS_SYSLOG_ERROR( "Unexpected response position\n"); |
---|
486 | return -RTEMS_IO_ERROR; |
---|
487 | } |
---|
488 | |
---|
489 | crc7 = sd_card_compute_crc7( e->response + e->response_index, 5); |
---|
490 | if (crc7 != SD_CARD_COMMAND_GET_CRC7( e->response + e->response_index) && |
---|
491 | SD_CARD_COMMAND_GET_CRC7( e->response + e->response_index) != 0x7f) { |
---|
492 | RTEMS_SYSLOG_ERROR( "CRC check failed on register command\n"); |
---|
493 | return -RTEMS_IO_ERROR; |
---|
494 | } |
---|
495 | |
---|
496 | *reg = sd_card_get_uint32( e->response + e->response_index + 1); |
---|
497 | |
---|
498 | return 0; |
---|
499 | } |
---|
500 | |
---|
501 | static int sd_card_stop_multiple_block_read( sd_card_driver_entry *e) |
---|
502 | { |
---|
503 | int rv = 0; |
---|
504 | uint8_t crc7; |
---|
505 | |
---|
506 | SD_CARD_COMMAND_SET_COMMAND( e->command, SD_CARD_CMD_STOP_TRANSMISSION); |
---|
507 | SD_CARD_COMMAND_SET_ARGUMENT( e->command, 0); |
---|
508 | /*crc7 = sd_card_compute_crc7( e->command + 1, 5);*/ |
---|
509 | crc7 = 0x30; /* Help compiler - command and argument are constants */ |
---|
510 | SD_CARD_COMMAND_SET_CRC7( e->command, crc7); |
---|
511 | rv = rtems_libi2c_write_bytes( e->bus, e->command, SD_CARD_COMMAND_SIZE); |
---|
512 | RTEMS_CHECK_RV( rv, "Write stop transfer token"); |
---|
513 | |
---|
514 | return 0; |
---|
515 | } |
---|
516 | |
---|
517 | static int sd_card_stop_multiple_block_write( sd_card_driver_entry *e) |
---|
518 | { |
---|
519 | int rv = 0; |
---|
520 | uint8_t stop_transfer [3] = { SD_CARD_IDLE_TOKEN, SD_CARD_STOP_TRANSFER_MULTIPLE_BLOCK_WRITE, SD_CARD_IDLE_TOKEN }; |
---|
521 | |
---|
522 | /* Wait until card is not busy */ |
---|
523 | rv = sd_card_wait( e); |
---|
524 | RTEMS_CHECK_RV( rv, "Wait"); |
---|
525 | |
---|
526 | /* Send stop token */ |
---|
527 | rv = rtems_libi2c_write_bytes( e->bus, stop_transfer, 3); |
---|
528 | RTEMS_CHECK_RV( rv, "Write stop transfer token"); |
---|
529 | |
---|
530 | /* Card is now busy */ |
---|
531 | e->busy = true; |
---|
532 | |
---|
533 | return 0; |
---|
534 | } |
---|
535 | |
---|
536 | static int sd_card_read( sd_card_driver_entry *e, uint8_t start_token, uint8_t *in, int n) |
---|
537 | { |
---|
538 | int rv = 0; |
---|
539 | |
---|
540 | /* Discard command response */ |
---|
541 | int r = e->response_index + 1; |
---|
542 | |
---|
543 | /* Standard response size */ |
---|
544 | int response_size = SD_CARD_COMMAND_SIZE; |
---|
545 | |
---|
546 | /* Where the response is stored */ |
---|
547 | uint8_t *response = e->response; |
---|
548 | |
---|
549 | /* Data input index */ |
---|
550 | int i = 0; |
---|
551 | |
---|
552 | /* CRC check of data */ |
---|
553 | uint16_t crc16; |
---|
554 | |
---|
555 | /* Maximum number of tokens to read. */ |
---|
556 | int retries = e->n_ac_max; |
---|
557 | |
---|
558 | SD_CARD_INVALIDATE_RESPONSE_INDEX( e); |
---|
559 | |
---|
560 | while (true) { |
---|
561 | RTEMS_DEBUG_PRINT( "Search from %u to %u\n", r, response_size - 1); |
---|
562 | |
---|
563 | /* Search the data start token in in current response buffer */ |
---|
564 | retries -= (response_size - r); |
---|
565 | while (r < response_size) { |
---|
566 | RTEMS_DEBUG_PRINT( "Token [%02u]: 0x%02x\n", r, response [r]); |
---|
567 | if (response [r] == start_token) { |
---|
568 | /* Discard data start token */ |
---|
569 | ++r; |
---|
570 | goto sd_card_read_start; |
---|
571 | } else if (SD_CARD_IS_DATA_ERROR( response [r])) { |
---|
572 | RTEMS_SYSLOG_ERROR( "Data error token [%02i]: 0x%02" PRIx8 "\n", r, response [r]); |
---|
573 | return -RTEMS_IO_ERROR; |
---|
574 | } else if (response [r] != SD_CARD_IDLE_TOKEN) { |
---|
575 | RTEMS_SYSLOG_ERROR( "Unexpected token [%02i]: 0x%02" PRIx8 "\n", r, response [r]); |
---|
576 | return -RTEMS_IO_ERROR; |
---|
577 | } |
---|
578 | ++r; |
---|
579 | } |
---|
580 | |
---|
581 | if (retries <= 0) { |
---|
582 | RTEMS_SYSLOG_ERROR( "Timeout\n"); |
---|
583 | return -RTEMS_IO_ERROR; |
---|
584 | } |
---|
585 | |
---|
586 | if (e->schedule_if_busy) |
---|
587 | rtems_task_wake_after( RTEMS_YIELD_PROCESSOR); |
---|
588 | |
---|
589 | /* Query more. We typically have to wait between 10 and 100 |
---|
590 | bytes. To reduce overhead, read the response in chunks of |
---|
591 | 50 bytes - this doesn't introduce too much copy overhead |
---|
592 | but does allow SPI DMA transfers to work efficiently. */ |
---|
593 | response = in; |
---|
594 | response_size = 50; |
---|
595 | if (response_size > n) |
---|
596 | response_size = n; |
---|
597 | rv = sd_card_query( e, response, response_size); |
---|
598 | RTEMS_CHECK_RV( rv, "Query data start token"); |
---|
599 | |
---|
600 | /* Reset start position */ |
---|
601 | r = 0; |
---|
602 | } |
---|
603 | |
---|
604 | sd_card_read_start: |
---|
605 | |
---|
606 | /* Read data */ |
---|
607 | while (r < response_size && i < n) { |
---|
608 | in [i++] = response [r++]; |
---|
609 | } |
---|
610 | |
---|
611 | /* Read more data? */ |
---|
612 | if (i < n) { |
---|
613 | rv = sd_card_query( e, &in [i], n - i); |
---|
614 | RTEMS_CHECK_RV( rv, "Read data"); |
---|
615 | i += rv; |
---|
616 | } |
---|
617 | |
---|
618 | /* Read CRC 16 and N_RC */ |
---|
619 | rv = sd_card_query( e, e->response, 3); |
---|
620 | RTEMS_CHECK_RV( rv, "Read CRC 16"); |
---|
621 | |
---|
622 | crc16 = sd_card_compute_crc16 (in, n); |
---|
623 | if ((e->response[0] != ((crc16 >> 8) & 0xff)) || |
---|
624 | (e->response[1] != (crc16 & 0xff))) { |
---|
625 | RTEMS_SYSLOG_ERROR( "CRC check failed on read\n"); |
---|
626 | return -RTEMS_IO_ERROR; |
---|
627 | } |
---|
628 | |
---|
629 | return i; |
---|
630 | } |
---|
631 | |
---|
632 | static int sd_card_write( sd_card_driver_entry *e, uint8_t start_token, uint8_t *out, int n) |
---|
633 | { |
---|
634 | int rv = 0; |
---|
635 | uint8_t crc16_bytes [2] = { 0, 0 }; |
---|
636 | uint16_t crc16; |
---|
637 | |
---|
638 | /* Data output index */ |
---|
639 | int o = 0; |
---|
640 | |
---|
641 | /* Wait until card is not busy */ |
---|
642 | rv = sd_card_wait( e); |
---|
643 | RTEMS_CHECK_RV( rv, "Wait"); |
---|
644 | |
---|
645 | /* Write data start token */ |
---|
646 | rv = rtems_libi2c_write_bytes( e->bus, &start_token, 1); |
---|
647 | RTEMS_CHECK_RV( rv, "Write data start token"); |
---|
648 | |
---|
649 | /* Write data */ |
---|
650 | o = rtems_libi2c_write_bytes( e->bus, out, n); |
---|
651 | RTEMS_CHECK_RV( o, "Write data"); |
---|
652 | |
---|
653 | /* Write CRC 16 */ |
---|
654 | crc16 = sd_card_compute_crc16(out, n); |
---|
655 | crc16_bytes[0] = (crc16>>8) & 0xff; |
---|
656 | crc16_bytes[1] = (crc16) & 0xff; |
---|
657 | rv = rtems_libi2c_write_bytes( e->bus, crc16_bytes, 2); |
---|
658 | RTEMS_CHECK_RV( rv, "Write CRC 16"); |
---|
659 | |
---|
660 | /* Read data response */ |
---|
661 | rv = sd_card_query( e, e->response, 2); |
---|
662 | RTEMS_CHECK_RV( rv, "Read data response"); |
---|
663 | if (SD_CARD_IS_DATA_REJECTED( e->response [0])) { |
---|
664 | RTEMS_SYSLOG_ERROR( "Data rejected: 0x%02" PRIx8 "\n", e->response [0]); |
---|
665 | return -RTEMS_IO_ERROR; |
---|
666 | } |
---|
667 | |
---|
668 | /* Card is now busy */ |
---|
669 | e->busy = true; |
---|
670 | |
---|
671 | return o; |
---|
672 | } |
---|
673 | |
---|
674 | static inline rtems_status_code sd_card_start( sd_card_driver_entry *e) |
---|
675 | { |
---|
676 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
---|
677 | int rv = 0; |
---|
678 | |
---|
679 | sc = rtems_libi2c_send_start( e->bus); |
---|
680 | RTEMS_CHECK_SC( sc, "Send start"); |
---|
681 | |
---|
682 | rv = rtems_libi2c_ioctl( e->bus, RTEMS_LIBI2C_IOCTL_SET_TFRMODE, &e->transfer_mode); |
---|
683 | RTEMS_CHECK_RV_SC( rv, "Set transfer mode"); |
---|
684 | |
---|
685 | sc = rtems_libi2c_send_addr( e->bus, 1); |
---|
686 | RTEMS_CHECK_SC( sc, "Send address"); |
---|
687 | |
---|
688 | return RTEMS_SUCCESSFUL; |
---|
689 | } |
---|
690 | |
---|
691 | static inline rtems_status_code sd_card_stop( sd_card_driver_entry *e) |
---|
692 | { |
---|
693 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
---|
694 | |
---|
695 | sc = rtems_libi2c_send_stop( e->bus); |
---|
696 | RTEMS_CHECK_SC( sc, "Send stop"); |
---|
697 | |
---|
698 | return RTEMS_SUCCESSFUL; |
---|
699 | } |
---|
700 | |
---|
701 | static rtems_status_code sd_card_init( sd_card_driver_entry *e) |
---|
702 | { |
---|
703 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
---|
704 | int rv = 0; |
---|
705 | uint8_t block [SD_CARD_BLOCK_SIZE_DEFAULT]; |
---|
706 | uint32_t transfer_speed = 0; |
---|
707 | uint32_t read_block_size = 0; |
---|
708 | uint32_t write_block_size = 0; |
---|
709 | uint8_t csd_structure = 0; |
---|
710 | uint64_t capacity = 0; |
---|
711 | uint8_t crc7; |
---|
712 | |
---|
713 | /* Assume first that we have a SD card and not a MMC card */ |
---|
714 | bool assume_sd = true; |
---|
715 | |
---|
716 | /* |
---|
717 | * Assume high capacity until proven wrong (applies to SD and not yet |
---|
718 | * existing MMC). |
---|
719 | */ |
---|
720 | bool high_capacity = true; |
---|
721 | |
---|
722 | bool do_cmd58 = true; |
---|
723 | uint32_t cmd_arg = 0; |
---|
724 | uint32_t if_cond_test = SD_CARD_FLAG_VHS_2_7_TO_3_3 | SD_CARD_FLAG_CHECK_PATTERN; |
---|
725 | uint32_t if_cond_reg = if_cond_test; |
---|
726 | |
---|
727 | /* Start */ |
---|
728 | sc = sd_card_start( e); |
---|
729 | RTEMS_CLEANUP_SC( sc, sd_card_driver_init_cleanup, "Start"); |
---|
730 | |
---|
731 | /* Wait until card is not busy */ |
---|
732 | rv = sd_card_wait( e); |
---|
733 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Wait"); |
---|
734 | |
---|
735 | /* Send idle tokens for at least 74 clock cycles with active chip select */ |
---|
736 | memset( block, SD_CARD_IDLE_TOKEN, SD_CARD_BLOCK_SIZE_DEFAULT); |
---|
737 | rv = rtems_libi2c_write_bytes( e->bus, block, SD_CARD_BLOCK_SIZE_DEFAULT); |
---|
738 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Active chip select delay"); |
---|
739 | |
---|
740 | /* Stop */ |
---|
741 | sc = sd_card_stop( e); |
---|
742 | RTEMS_CHECK_SC( sc, "Stop"); |
---|
743 | |
---|
744 | /* Start with inactive chip select */ |
---|
745 | sc = rtems_libi2c_send_start( e->bus); |
---|
746 | RTEMS_CHECK_SC( sc, "Send start"); |
---|
747 | |
---|
748 | /* Set transfer mode */ |
---|
749 | rv = rtems_libi2c_ioctl( e->bus, RTEMS_LIBI2C_IOCTL_SET_TFRMODE, &e->transfer_mode); |
---|
750 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Set transfer mode"); |
---|
751 | |
---|
752 | /* Send idle tokens with inactive chip select */ |
---|
753 | rv = sd_card_query( e, e->response, SD_CARD_COMMAND_SIZE); |
---|
754 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Inactive chip select delay"); |
---|
755 | |
---|
756 | /* Activate chip select */ |
---|
757 | sc = rtems_libi2c_send_addr( e->bus, 1); |
---|
758 | RTEMS_CLEANUP_SC( sc, sd_card_driver_init_cleanup, "Send address"); |
---|
759 | |
---|
760 | /* Stop multiple block write */ |
---|
761 | sd_card_stop_multiple_block_write( e); |
---|
762 | |
---|
763 | /* Get card status */ |
---|
764 | sd_card_send_command( e, SD_CARD_CMD_SEND_STATUS, 0); |
---|
765 | |
---|
766 | /* Stop multiple block read */ |
---|
767 | sd_card_stop_multiple_block_read( e); |
---|
768 | |
---|
769 | /* Switch to SPI mode */ |
---|
770 | rv = sd_card_send_command( e, SD_CARD_CMD_GO_IDLE_STATE, 0); |
---|
771 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Send: SD_CARD_CMD_GO_IDLE_STATE"); |
---|
772 | |
---|
773 | /* |
---|
774 | * Get interface condition, CMD8. This is new for SD 2.x and enables |
---|
775 | * getting the High Capacity Support flag HCS and checks that the |
---|
776 | * voltage is right. Some MMCs accept this command but will still fail |
---|
777 | * on ACMD41. SD 1.x cards will fails this command and do not support |
---|
778 | * HCS (> 2G capacity). |
---|
779 | */ |
---|
780 | rv = sd_card_send_register_command( e, SD_CARD_CMD_SEND_IF_COND, if_cond_reg, &if_cond_reg); |
---|
781 | |
---|
782 | /* |
---|
783 | * Regardless of whether CMD8 above passes or fails, send ACMD41. If |
---|
784 | * card is MMC it will fail. But older SD < 2.0 (which fail CMD8) will |
---|
785 | * always stay "idle" if cmd_arg is non-zero, so set to 0 above on |
---|
786 | * fail. |
---|
787 | */ |
---|
788 | if (rv < 0) { |
---|
789 | /* Failed CMD8, so SD 1.x or MMC */ |
---|
790 | cmd_arg = 0; |
---|
791 | } else { |
---|
792 | cmd_arg = SD_CARD_FLAG_HCS; |
---|
793 | } |
---|
794 | |
---|
795 | /* Enable CRC */ |
---|
796 | sd_card_send_command( e, SD_CARD_CMD_CRC_ON_OFF, 1); |
---|
797 | |
---|
798 | /* Initialize card */ |
---|
799 | while (true) { |
---|
800 | if (assume_sd) { |
---|
801 | /* This command (CMD55) supported by SD and (most?) MMCs */ |
---|
802 | rv = sd_card_send_command( e, SD_CARD_CMD_APP_CMD, 0); |
---|
803 | if (rv < 0) { |
---|
804 | RTEMS_SYSLOG( "CMD55 failed. Assume MMC and try CMD1\n"); |
---|
805 | assume_sd = false; |
---|
806 | continue; |
---|
807 | } |
---|
808 | |
---|
809 | /* |
---|
810 | * This command (ACMD41) only supported by SD. Always |
---|
811 | * fails if MMC. |
---|
812 | */ |
---|
813 | rv = sd_card_send_command( e, SD_CARD_ACMD_SD_SEND_OP_COND, cmd_arg); |
---|
814 | if (rv < 0) { |
---|
815 | /* |
---|
816 | * This *will* fail for MMC. If fails, bad/no |
---|
817 | * card or card is MMC, do CMD58 then CMD1. |
---|
818 | */ |
---|
819 | RTEMS_SYSLOG( "ACMD41 failed. Assume MMC and do CMD58 (once) then CMD1\n"); |
---|
820 | assume_sd = false; |
---|
821 | cmd_arg = SD_CARD_FLAG_HCS; |
---|
822 | do_cmd58 = true; |
---|
823 | continue; |
---|
824 | } else { |
---|
825 | /* |
---|
826 | * Passed ACMD41 so SD. It is now save to |
---|
827 | * check if_cond_reg from CMD8. Reject the |
---|
828 | * card in case of a indicated bad voltage. |
---|
829 | */ |
---|
830 | if (if_cond_reg != if_cond_test) { |
---|
831 | RTEMS_CLEANUP_RV_SC( -1, sc, sd_card_driver_init_cleanup, "Bad voltage for SD"); |
---|
832 | } |
---|
833 | } |
---|
834 | } else { |
---|
835 | /* |
---|
836 | * Does not seem to be SD card. Do init for MMC. |
---|
837 | * First send CMD58 once to enable check for HCS |
---|
838 | * (similar to CMD8 of SD) with bits 30:29 set to 10b. |
---|
839 | * This will work for MMC >= 4.2. Older cards (<= 4.1) |
---|
840 | * may may not respond to CMD1 unless CMD58 is sent |
---|
841 | * again with zero argument. |
---|
842 | */ |
---|
843 | if (do_cmd58) { |
---|
844 | rv = sd_card_send_command( e, SD_CARD_CMD_READ_OCR, cmd_arg); |
---|
845 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Failed CMD58 for MMC"); |
---|
846 | |
---|
847 | /* A one-shot call */ |
---|
848 | do_cmd58 = false; |
---|
849 | } |
---|
850 | |
---|
851 | /* Do CMD1 */ |
---|
852 | rv = sd_card_send_command( e, SD_CARD_CMD_SEND_OP_COND, 0); |
---|
853 | if (rv < 0) { |
---|
854 | if (cmd_arg != 0) { |
---|
855 | /* |
---|
856 | * Send CMD58 again with zero argument |
---|
857 | * value. Proves card is not |
---|
858 | * high_capacity. |
---|
859 | */ |
---|
860 | cmd_arg = 0; |
---|
861 | do_cmd58 = true; |
---|
862 | high_capacity = false; |
---|
863 | continue; |
---|
864 | } |
---|
865 | |
---|
866 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Failed to initialize MMC"); |
---|
867 | } |
---|
868 | } |
---|
869 | |
---|
870 | /* |
---|
871 | * Not idle? |
---|
872 | * |
---|
873 | * This hangs forever if the card remains not idle and sends |
---|
874 | * always a valid response. |
---|
875 | */ |
---|
876 | if (SD_CARD_IS_NOT_IDLE_RESPONSE( e->response [e->response_index])) { |
---|
877 | break; |
---|
878 | } |
---|
879 | |
---|
880 | /* Invoke the scheduler */ |
---|
881 | rtems_task_wake_after( RTEMS_YIELD_PROCESSOR); |
---|
882 | } |
---|
883 | |
---|
884 | /* Now we know if we are SD or MMC */ |
---|
885 | if (assume_sd) { |
---|
886 | if (cmd_arg == 0) { |
---|
887 | /* SD is < 2.0 so never high capacity (<= 2G) */ |
---|
888 | high_capacity = 0; |
---|
889 | } else { |
---|
890 | uint32_t reg = 0; |
---|
891 | |
---|
892 | /* |
---|
893 | * SD is definitely 2.x. Now need to send CMD58 to get |
---|
894 | * the OCR to see if the HCS bit is set (capacity > 2G) |
---|
895 | * or if bit is off (capacity <= 2G, standard |
---|
896 | * capacity). |
---|
897 | */ |
---|
898 | rv = sd_card_send_register_command( e, SD_CARD_CMD_READ_OCR, 0, ®); |
---|
899 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Failed CMD58 for SD 2.x"); |
---|
900 | |
---|
901 | /* Check HCS bit of OCR */ |
---|
902 | high_capacity = (reg & SD_CARD_FLAG_HCS) != 0; |
---|
903 | } |
---|
904 | } else { |
---|
905 | /* |
---|
906 | * Card is MMC. Unless already proven to be not HCS (< 4.2) |
---|
907 | * must do CMD58 again to check the OCR bits 30:29. |
---|
908 | */ |
---|
909 | if (high_capacity) { |
---|
910 | uint32_t reg = 0; |
---|
911 | |
---|
912 | /* |
---|
913 | * The argument should still be correct since was never |
---|
914 | * set to 0 |
---|
915 | */ |
---|
916 | rv = sd_card_send_register_command( e, SD_CARD_CMD_READ_OCR, cmd_arg, ®); |
---|
917 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Failed CMD58 for MMC 4.2"); |
---|
918 | |
---|
919 | /* Check HCS bit of the OCR */ |
---|
920 | high_capacity = (reg & 0x600000) == SD_CARD_FLAG_HCS; |
---|
921 | } |
---|
922 | } |
---|
923 | |
---|
924 | /* Card Identification */ |
---|
925 | if (e->verbose) { |
---|
926 | rv = sd_card_send_command( e, SD_CARD_CMD_SEND_CID, 0); |
---|
927 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Send: SD_CARD_CMD_SEND_CID"); |
---|
928 | rv = sd_card_read( e, SD_CARD_START_BLOCK_SINGLE_BLOCK_READ, block, SD_CARD_CID_SIZE); |
---|
929 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Read: SD_CARD_CMD_SEND_CID"); |
---|
930 | RTEMS_SYSLOG( "*** Card Identification ***\n"); |
---|
931 | RTEMS_SYSLOG( "Manufacturer ID : %" PRIu8 "\n", SD_CARD_CID_GET_MID( block)); |
---|
932 | RTEMS_SYSLOG( "OEM/Application ID : %" PRIu16 "\n", SD_CARD_CID_GET_OID( block)); |
---|
933 | RTEMS_SYSLOG( |
---|
934 | "Product name : %c%c%c%c%c%c\n", |
---|
935 | SD_CARD_CID_GET_PNM( block, 0), |
---|
936 | SD_CARD_CID_GET_PNM( block, 1), |
---|
937 | SD_CARD_CID_GET_PNM( block, 2), |
---|
938 | SD_CARD_CID_GET_PNM( block, 3), |
---|
939 | SD_CARD_CID_GET_PNM( block, 4), |
---|
940 | SD_CARD_CID_GET_PNM( block, 5) |
---|
941 | ); |
---|
942 | RTEMS_SYSLOG( "Product revision : %" PRIu8 "\n", SD_CARD_CID_GET_PRV( block)); |
---|
943 | RTEMS_SYSLOG( "Product serial number : %" PRIu32 "\n", SD_CARD_CID_GET_PSN( block)); |
---|
944 | RTEMS_SYSLOG( "Manufacturing date : %" PRIu8 "\n", SD_CARD_CID_GET_MDT( block)); |
---|
945 | RTEMS_SYSLOG( "7-bit CRC checksum : %" PRIu8 "\n", SD_CARD_CID_GET_CRC7( block)); |
---|
946 | crc7 = sd_card_compute_crc7( block, 15); |
---|
947 | if (crc7 != SD_CARD_CID_GET_CRC7( block)) |
---|
948 | RTEMS_SYSLOG( " Failed! (computed %02" PRIx8 ")\n", crc7); |
---|
949 | } |
---|
950 | |
---|
951 | /* Card Specific Data */ |
---|
952 | |
---|
953 | /* Read CSD */ |
---|
954 | rv = sd_card_send_command( e, SD_CARD_CMD_SEND_CSD, 0); |
---|
955 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Send: SD_CARD_CMD_SEND_CSD"); |
---|
956 | rv = sd_card_read( e, SD_CARD_START_BLOCK_SINGLE_BLOCK_READ, block, SD_CARD_CSD_SIZE); |
---|
957 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Read: SD_CARD_CMD_SEND_CSD"); |
---|
958 | |
---|
959 | crc7 = sd_card_compute_crc7( block, 15); |
---|
960 | if (crc7 != SD_CARD_CID_GET_CRC7( block)) { |
---|
961 | RTEMS_SYSLOG( "SD_CARD_CMD_SEND_CSD CRC failed\n"); |
---|
962 | sc = RTEMS_IO_ERROR; |
---|
963 | goto sd_card_driver_init_cleanup; |
---|
964 | } |
---|
965 | |
---|
966 | /* CSD Structure */ |
---|
967 | csd_structure = SD_CARD_CSD_GET_CSD_STRUCTURE( block); |
---|
968 | |
---|
969 | /* Transfer speed and access time */ |
---|
970 | transfer_speed = sd_card_transfer_speed( block); |
---|
971 | e->transfer_mode.baudrate = transfer_speed; |
---|
972 | e->n_ac_max = sd_card_max_access_time( block, transfer_speed); |
---|
973 | |
---|
974 | /* Block sizes and capacity */ |
---|
975 | if (csd_structure == 0 || !assume_sd) { |
---|
976 | /* Treat MMC same as CSD Version 1.0 */ |
---|
977 | |
---|
978 | read_block_size = 1U << SD_CARD_CSD_GET_READ_BLK_LEN( block); |
---|
979 | e->block_size_shift = SD_CARD_CSD_GET_WRITE_BLK_LEN( block); |
---|
980 | write_block_size = 1U << e->block_size_shift; |
---|
981 | if (read_block_size < write_block_size) { |
---|
982 | RTEMS_SYSLOG_ERROR( "Read block size smaller than write block size\n"); |
---|
983 | return -RTEMS_IO_ERROR; |
---|
984 | } |
---|
985 | e->block_size = write_block_size; |
---|
986 | e->block_number = sd_card_block_number( block); |
---|
987 | capacity = sd_card_capacity( block); |
---|
988 | } else if (csd_structure == 1) { |
---|
989 | uint32_t c_size = SD_CARD_CSD_1_GET_C_SIZE( block); |
---|
990 | |
---|
991 | /* Block size is fixed in CSD Version 2.0 */ |
---|
992 | e->block_size_shift = 9; |
---|
993 | e->block_size = 512; |
---|
994 | |
---|
995 | e->block_number = (c_size + 1) * 1024; |
---|
996 | capacity = (c_size + 1) * 512 * 1024; |
---|
997 | read_block_size = 512; |
---|
998 | write_block_size = 512; |
---|
999 | |
---|
1000 | /* Timeout is fixed at 100ms in CSD Version 2.0 */ |
---|
1001 | e->n_ac_max = transfer_speed / 80; |
---|
1002 | } else { |
---|
1003 | RTEMS_DO_CLEANUP_SC( RTEMS_IO_ERROR, sc, sd_card_driver_init_cleanup, "Unexpected CSD Structure number"); |
---|
1004 | } |
---|
1005 | |
---|
1006 | /* Print CSD information */ |
---|
1007 | if (e->verbose) { |
---|
1008 | RTEMS_SYSLOG( "*** Card Specific Data ***\n"); |
---|
1009 | RTEMS_SYSLOG( "CSD structure : %" PRIu8 "\n", SD_CARD_CSD_GET_CSD_STRUCTURE( block)); |
---|
1010 | RTEMS_SYSLOG( "Spec version : %" PRIu8 "\n", SD_CARD_CSD_GET_SPEC_VERS( block)); |
---|
1011 | RTEMS_SYSLOG( "Access time [ns] : %" PRIu32 "\n", sd_card_access_time( block)); |
---|
1012 | RTEMS_SYSLOG( "Access time [N] : %" PRIu32 "\n", SD_CARD_CSD_GET_NSAC( block)*100); |
---|
1013 | RTEMS_SYSLOG( "Max access time [N] : %" PRIu32 "\n", e->n_ac_max); |
---|
1014 | RTEMS_SYSLOG( "Max read block size [B] : %" PRIu32 "\n", read_block_size); |
---|
1015 | RTEMS_SYSLOG( "Max write block size [B] : %" PRIu32 "\n", write_block_size); |
---|
1016 | RTEMS_SYSLOG( "Block size [B] : %" PRIu32 "\n", e->block_size); |
---|
1017 | RTEMS_SYSLOG( "Block number : %" PRIu32 "\n", e->block_number); |
---|
1018 | RTEMS_SYSLOG( "Capacity [B] : %" PRIu64 "\n", capacity); |
---|
1019 | RTEMS_SYSLOG( "Max transfer speed [b/s] : %" PRIu32 "\n", transfer_speed); |
---|
1020 | } |
---|
1021 | |
---|
1022 | if (high_capacity) { |
---|
1023 | /* For high capacity cards the address is in blocks */ |
---|
1024 | e->block_size_shift = 0; |
---|
1025 | } else if (e->block_size_shift == 10) { |
---|
1026 | /* |
---|
1027 | * Low capacity 2GByte cards with reported block size of 1024 |
---|
1028 | * need to be set back to block size of 512 per 'Simplified |
---|
1029 | * Physical Layer Specification Version 2.0' section 4.3.2. |
---|
1030 | * Otherwise, CMD16 fails if set to 1024. |
---|
1031 | */ |
---|
1032 | e->block_size_shift = 9; |
---|
1033 | e->block_size = 512; |
---|
1034 | e->block_number *= 2; |
---|
1035 | } |
---|
1036 | |
---|
1037 | /* Set read block size */ |
---|
1038 | rv = sd_card_send_command( e, SD_CARD_CMD_SET_BLOCKLEN, e->block_size); |
---|
1039 | RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Send: SD_CARD_CMD_SET_BLOCKLEN"); |
---|
1040 | |
---|
1041 | /* Stop */ |
---|
1042 | sc = sd_card_stop( e); |
---|
1043 | RTEMS_CHECK_SC( sc, "Stop"); |
---|
1044 | |
---|
1045 | return RTEMS_SUCCESSFUL; |
---|
1046 | |
---|
1047 | sd_card_driver_init_cleanup: |
---|
1048 | |
---|
1049 | /* Stop */ |
---|
1050 | sd_card_stop( e); |
---|
1051 | |
---|
1052 | return sc; |
---|
1053 | } |
---|
1054 | /** @} */ |
---|
1055 | |
---|
1056 | /** |
---|
1057 | * @name Disk Driver Functions |
---|
1058 | * @{ |
---|
1059 | */ |
---|
1060 | |
---|
1061 | static int sd_card_disk_block_read( sd_card_driver_entry *e, rtems_blkdev_request *r) |
---|
1062 | { |
---|
1063 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
---|
1064 | int rv = 0; |
---|
1065 | uint32_t start_address = RTEMS_BLKDEV_START_BLOCK (r) << e->block_size_shift; |
---|
1066 | uint32_t i = 0; |
---|
1067 | |
---|
1068 | #ifdef DEBUG |
---|
1069 | /* Check request */ |
---|
1070 | if (r->bufs[0].block >= e->block_number) { |
---|
1071 | RTEMS_SYSLOG_ERROR( "Start block number out of range"); |
---|
1072 | return -RTEMS_INTERNAL_ERROR; |
---|
1073 | } else if (r->bufnum > e->block_number - RTEMS_BLKDEV_START_BLOCK (r)) { |
---|
1074 | RTEMS_SYSLOG_ERROR( "Block count out of range"); |
---|
1075 | return -RTEMS_INTERNAL_ERROR; |
---|
1076 | } |
---|
1077 | #endif /* DEBUG */ |
---|
1078 | |
---|
1079 | /* Start */ |
---|
1080 | sc = sd_card_start( e); |
---|
1081 | RTEMS_CLEANUP_SC_RV( sc, rv, sd_card_disk_block_read_cleanup, "Start"); |
---|
1082 | |
---|
1083 | if (r->bufnum == 1) { |
---|
1084 | #ifdef DEBUG |
---|
1085 | /* Check buffer */ |
---|
1086 | if (r->bufs [0].length != e->block_size) { |
---|
1087 | RTEMS_DO_CLEANUP_RV( -RTEMS_INTERNAL_ERROR, rv, sd_card_disk_block_read_cleanup, "Buffer and disk block size are not equal"); |
---|
1088 | } |
---|
1089 | RTEMS_DEBUG_PRINT( "[01:01]: buffer = 0x%08x, size = %u\n", r->bufs [0].buffer, r->bufs [0].length); |
---|
1090 | #endif /* DEBUG */ |
---|
1091 | |
---|
1092 | /* Single block read */ |
---|
1093 | rv = sd_card_send_command( e, SD_CARD_CMD_READ_SINGLE_BLOCK, start_address); |
---|
1094 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_cleanup, "Send: SD_CARD_CMD_READ_SINGLE_BLOCK"); |
---|
1095 | rv = sd_card_read( e, SD_CARD_START_BLOCK_SINGLE_BLOCK_READ, (uint8_t *) r->bufs [0].buffer, (int) e->block_size); |
---|
1096 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_cleanup, "Read: SD_CARD_CMD_READ_SINGLE_BLOCK"); |
---|
1097 | } else { |
---|
1098 | /* Start multiple block read */ |
---|
1099 | rv = sd_card_send_command( e, SD_CARD_CMD_READ_MULTIPLE_BLOCK, start_address); |
---|
1100 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_stop_cleanup, "Send: SD_CARD_CMD_READ_MULTIPLE_BLOCK"); |
---|
1101 | |
---|
1102 | /* Multiple block read */ |
---|
1103 | for (i = 0; i < r->bufnum; ++i) { |
---|
1104 | #ifdef DEBUG |
---|
1105 | /* Check buffer */ |
---|
1106 | if (r->bufs [i].length != e->block_size) { |
---|
1107 | RTEMS_DO_CLEANUP_RV( -RTEMS_INTERNAL_ERROR, rv, sd_card_disk_block_read_stop_cleanup, "Buffer and disk block size are not equal"); |
---|
1108 | } |
---|
1109 | RTEMS_DEBUG_PRINT( "[%02u:%02u]: buffer = 0x%08x, size = %u\n", i + 1, r->bufnum, r->bufs [i].buffer, r->bufs [i].length); |
---|
1110 | #endif /* DEBUG */ |
---|
1111 | |
---|
1112 | rv = sd_card_read( e, SD_CARD_START_BLOCK_MULTIPLE_BLOCK_READ, (uint8_t *) r->bufs [i].buffer, (int) e->block_size); |
---|
1113 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_stop_cleanup, "Read block"); |
---|
1114 | } |
---|
1115 | |
---|
1116 | /* Stop multiple block read */ |
---|
1117 | rv = sd_card_stop_multiple_block_read( e); |
---|
1118 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_cleanup, "Stop multiple block read"); |
---|
1119 | } |
---|
1120 | |
---|
1121 | /* Stop */ |
---|
1122 | sc = sd_card_stop( e); |
---|
1123 | RTEMS_CHECK_SC_RV( sc, "Stop"); |
---|
1124 | |
---|
1125 | /* Done */ |
---|
1126 | rtems_blkdev_request_done( r, RTEMS_SUCCESSFUL); |
---|
1127 | |
---|
1128 | return 0; |
---|
1129 | |
---|
1130 | sd_card_disk_block_read_stop_cleanup: |
---|
1131 | |
---|
1132 | /* Stop multiple block read */ |
---|
1133 | sd_card_stop_multiple_block_read( e); |
---|
1134 | |
---|
1135 | sd_card_disk_block_read_cleanup: |
---|
1136 | |
---|
1137 | /* Stop */ |
---|
1138 | sd_card_stop( e); |
---|
1139 | |
---|
1140 | /* Done */ |
---|
1141 | rtems_blkdev_request_done( r, RTEMS_IO_ERROR); |
---|
1142 | |
---|
1143 | return 0; |
---|
1144 | } |
---|
1145 | |
---|
1146 | static int sd_card_disk_block_write( sd_card_driver_entry *e, rtems_blkdev_request *r) |
---|
1147 | { |
---|
1148 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
---|
1149 | int rv = 0; |
---|
1150 | uint32_t start_address = RTEMS_BLKDEV_START_BLOCK (r) << e->block_size_shift; |
---|
1151 | uint32_t i = 0; |
---|
1152 | |
---|
1153 | #ifdef DEBUG |
---|
1154 | /* Check request */ |
---|
1155 | if (r->bufs[0].block >= e->block_number) { |
---|
1156 | RTEMS_SYSLOG_ERROR( "Start block number out of range"); |
---|
1157 | return -RTEMS_INTERNAL_ERROR; |
---|
1158 | } else if (r->bufnum > e->block_number - RTEMS_BLKDEV_START_BLOCK (r)) { |
---|
1159 | RTEMS_SYSLOG_ERROR( "Block count out of range"); |
---|
1160 | return -RTEMS_INTERNAL_ERROR; |
---|
1161 | } |
---|
1162 | #endif /* DEBUG */ |
---|
1163 | |
---|
1164 | /* Start */ |
---|
1165 | sc = sd_card_start( e); |
---|
1166 | RTEMS_CLEANUP_SC_RV( sc, rv, sd_card_disk_block_write_cleanup, "Start"); |
---|
1167 | |
---|
1168 | if (r->bufnum == 1) { |
---|
1169 | #ifdef DEBUG |
---|
1170 | /* Check buffer */ |
---|
1171 | if (r->bufs [0].length != e->block_size) { |
---|
1172 | RTEMS_DO_CLEANUP_RV( -RTEMS_INTERNAL_ERROR, rv, sd_card_disk_block_write_cleanup, "Buffer and disk block size are not equal"); |
---|
1173 | } |
---|
1174 | RTEMS_DEBUG_PRINT( "[01:01]: buffer = 0x%08x, size = %u\n", r->bufs [0].buffer, r->bufs [0].length); |
---|
1175 | #endif /* DEBUG */ |
---|
1176 | |
---|
1177 | /* Single block write */ |
---|
1178 | rv = sd_card_send_command( e, SD_CARD_CMD_WRITE_BLOCK, start_address); |
---|
1179 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_cleanup, "Send: SD_CARD_CMD_WRITE_BLOCK"); |
---|
1180 | rv = sd_card_write( e, SD_CARD_START_BLOCK_SINGLE_BLOCK_WRITE, (uint8_t *) r->bufs [0].buffer, (int) e->block_size); |
---|
1181 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_cleanup, "Write: SD_CARD_CMD_WRITE_BLOCK"); |
---|
1182 | } else { |
---|
1183 | /* Start multiple block write */ |
---|
1184 | rv = sd_card_send_command( e, SD_CARD_CMD_WRITE_MULTIPLE_BLOCK, start_address); |
---|
1185 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_stop_cleanup, "Send: SD_CARD_CMD_WRITE_MULTIPLE_BLOCK"); |
---|
1186 | |
---|
1187 | /* Multiple block write */ |
---|
1188 | for (i = 0; i < r->bufnum; ++i) { |
---|
1189 | #ifdef DEBUG |
---|
1190 | /* Check buffer */ |
---|
1191 | if (r->bufs [i].length != e->block_size) { |
---|
1192 | RTEMS_DO_CLEANUP_RV( -RTEMS_INTERNAL_ERROR, rv, sd_card_disk_block_write_stop_cleanup, "Buffer and disk block size are not equal"); |
---|
1193 | } |
---|
1194 | RTEMS_DEBUG_PRINT( "[%02u:%02u]: buffer = 0x%08x, size = %u\n", i + 1, r->bufnum, r->bufs [i].buffer, r->bufs [i].length); |
---|
1195 | #endif /* DEBUG */ |
---|
1196 | |
---|
1197 | rv = sd_card_write( e, SD_CARD_START_BLOCK_MULTIPLE_BLOCK_WRITE, (uint8_t *) r->bufs [i].buffer, (int) e->block_size); |
---|
1198 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_stop_cleanup, "Write block"); |
---|
1199 | } |
---|
1200 | |
---|
1201 | /* Stop multiple block write */ |
---|
1202 | rv = sd_card_stop_multiple_block_write( e); |
---|
1203 | RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_cleanup, "Stop multiple block write"); |
---|
1204 | } |
---|
1205 | |
---|
1206 | /* Get card status */ |
---|
1207 | rv = sd_card_send_command( e, SD_CARD_CMD_SEND_STATUS, 0); |
---|
1208 | RTEMS_CHECK_RV( rv, "Send: SD_CARD_CMD_SEND_STATUS"); |
---|
1209 | |
---|
1210 | /* Stop */ |
---|
1211 | sc = sd_card_stop( e); |
---|
1212 | RTEMS_CHECK_SC_RV( sc, "Stop"); |
---|
1213 | |
---|
1214 | /* Done */ |
---|
1215 | rtems_blkdev_request_done( r, RTEMS_SUCCESSFUL); |
---|
1216 | |
---|
1217 | return 0; |
---|
1218 | |
---|
1219 | sd_card_disk_block_write_stop_cleanup: |
---|
1220 | |
---|
1221 | /* Stop multiple block write */ |
---|
1222 | sd_card_stop_multiple_block_write( e); |
---|
1223 | |
---|
1224 | sd_card_disk_block_write_cleanup: |
---|
1225 | |
---|
1226 | /* Get card status */ |
---|
1227 | rv = sd_card_send_command( e, SD_CARD_CMD_SEND_STATUS, 0); |
---|
1228 | RTEMS_CHECK_RV( rv, "Send: SD_CARD_CMD_SEND_STATUS"); |
---|
1229 | |
---|
1230 | /* Stop */ |
---|
1231 | sd_card_stop( e); |
---|
1232 | |
---|
1233 | /* Done */ |
---|
1234 | rtems_blkdev_request_done( r, RTEMS_IO_ERROR); |
---|
1235 | |
---|
1236 | return 0; |
---|
1237 | } |
---|
1238 | |
---|
1239 | static int sd_card_disk_ioctl( rtems_disk_device *dd, uint32_t req, void *arg) |
---|
1240 | { |
---|
1241 | RTEMS_DEBUG_PRINT( "dev = %u, req = %u, arg = 0x08%x\n", dev, req, arg); |
---|
1242 | if (req == RTEMS_BLKIO_REQUEST) { |
---|
1243 | rtems_device_minor_number minor = rtems_disk_get_minor_number( dd); |
---|
1244 | sd_card_driver_entry *e = &sd_card_driver_table [minor]; |
---|
1245 | rtems_blkdev_request *r = (rtems_blkdev_request *) arg; |
---|
1246 | int (*f)( sd_card_driver_entry *, rtems_blkdev_request *); |
---|
1247 | uint32_t retries = e->retries; |
---|
1248 | int result; |
---|
1249 | |
---|
1250 | switch (r->req) { |
---|
1251 | case RTEMS_BLKDEV_REQ_READ: |
---|
1252 | f = sd_card_disk_block_read; |
---|
1253 | break; |
---|
1254 | case RTEMS_BLKDEV_REQ_WRITE: |
---|
1255 | f = sd_card_disk_block_write; |
---|
1256 | break; |
---|
1257 | default: |
---|
1258 | errno = EINVAL; |
---|
1259 | return -1; |
---|
1260 | } |
---|
1261 | do { |
---|
1262 | result = f( e, r); |
---|
1263 | } while (retries-- > 0 && result != 0); |
---|
1264 | return result; |
---|
1265 | |
---|
1266 | } else if (req == RTEMS_BLKIO_CAPABILITIES) { |
---|
1267 | *(uint32_t *) arg = RTEMS_BLKDEV_CAP_MULTISECTOR_CONT; |
---|
1268 | return 0; |
---|
1269 | } else { |
---|
1270 | errno = EINVAL; |
---|
1271 | return -1; |
---|
1272 | } |
---|
1273 | } |
---|
1274 | |
---|
1275 | static rtems_status_code sd_card_disk_init( rtems_device_major_number major, rtems_device_minor_number minor, void *arg) |
---|
1276 | { |
---|
1277 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
---|
1278 | |
---|
1279 | /* Initialize disk IO */ |
---|
1280 | sc = rtems_disk_io_initialize(); |
---|
1281 | RTEMS_CHECK_SC( sc, "Initialize RTEMS disk IO"); |
---|
1282 | |
---|
1283 | for (minor = 0; minor < sd_card_driver_table_size; ++minor) { |
---|
1284 | sd_card_driver_entry *e = &sd_card_driver_table [minor]; |
---|
1285 | dev_t dev = rtems_filesystem_make_dev_t( major, minor); |
---|
1286 | uint32_t retries = e->retries; |
---|
1287 | |
---|
1288 | /* Initialize SD Card */ |
---|
1289 | do { |
---|
1290 | sc = sd_card_init( e); |
---|
1291 | } while (retries-- > 0 && sc != RTEMS_SUCCESSFUL); |
---|
1292 | RTEMS_CHECK_SC( sc, "Initialize SD Card"); |
---|
1293 | |
---|
1294 | /* Create disk device */ |
---|
1295 | sc = rtems_disk_create_phys( dev, e->block_size, e->block_number, sd_card_disk_ioctl, NULL, e->device_name); |
---|
1296 | RTEMS_CHECK_SC( sc, "Create disk device"); |
---|
1297 | } |
---|
1298 | |
---|
1299 | return RTEMS_SUCCESSFUL; |
---|
1300 | } |
---|
1301 | |
---|
1302 | /** @} */ |
---|
1303 | |
---|
1304 | static const rtems_driver_address_table sd_card_disk_ops = { |
---|
1305 | .initialization_entry = sd_card_disk_init, |
---|
1306 | .open_entry = rtems_blkdev_generic_open, |
---|
1307 | .close_entry = rtems_blkdev_generic_close, |
---|
1308 | .read_entry = rtems_blkdev_generic_read, |
---|
1309 | .write_entry = rtems_blkdev_generic_write, |
---|
1310 | .control_entry = rtems_blkdev_generic_ioctl |
---|
1311 | }; |
---|
1312 | |
---|
1313 | rtems_status_code sd_card_register( void) |
---|
1314 | { |
---|
1315 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
---|
1316 | rtems_device_major_number major = 0; |
---|
1317 | |
---|
1318 | sc = rtems_io_register_driver( 0, &sd_card_disk_ops, &major); |
---|
1319 | RTEMS_CHECK_SC( sc, "Register disk SD Card driver"); |
---|
1320 | |
---|
1321 | return RTEMS_SUCCESSFUL; |
---|
1322 | } |
---|