1 | /* memcard.c |
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2 | * |
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3 | * Milkymist memory card driver for RTEMS |
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4 | * |
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5 | * The license and distribution terms for this file may be |
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6 | * found in the file LICENSE in this distribution or at |
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7 | * http://www.rtems.com/license/LICENSE. |
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8 | * |
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9 | * COPYRIGHT (c) 2010, 2011 Sebastien Bourdeauducq |
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10 | */ |
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11 | |
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12 | #define RTEMS_STATUS_CHECKS_USE_PRINTK |
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13 | |
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14 | #include <rtems.h> |
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15 | #include <rtems/libio.h> |
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16 | #include <rtems/diskdevs.h> |
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17 | #include <rtems/blkdev.h> |
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18 | #include <rtems/status-checks.h> |
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19 | #include <errno.h> |
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20 | #include <bsp.h> |
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21 | #include "../include/system_conf.h" |
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22 | #include "milkymist_memcard.h" |
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23 | |
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24 | //#define MEMCARD_DEBUG |
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25 | |
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26 | #define BLOCK_SIZE 512 |
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27 | |
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28 | static void memcard_start_cmd_tx(void) |
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29 | { |
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30 | MM_WRITE(MM_MEMCARD_ENABLE, MEMCARD_ENABLE_CMD_TX); |
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31 | } |
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32 | |
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33 | static void memcard_start_cmd_rx(void) |
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34 | { |
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35 | MM_WRITE(MM_MEMCARD_PENDING, MEMCARD_PENDING_CMD_RX); |
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36 | MM_WRITE(MM_MEMCARD_START, MEMCARD_START_CMD_RX); |
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37 | MM_WRITE(MM_MEMCARD_ENABLE, MEMCARD_ENABLE_CMD_RX); |
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38 | } |
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39 | |
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40 | static void memcard_start_cmd_dat_rx(void) |
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41 | { |
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42 | MM_WRITE(MM_MEMCARD_PENDING, MEMCARD_PENDING_CMD_RX|MEMCARD_PENDING_DAT_RX); |
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43 | MM_WRITE(MM_MEMCARD_START, MEMCARD_START_CMD_RX|MEMCARD_START_DAT_RX); |
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44 | MM_WRITE(MM_MEMCARD_ENABLE, MEMCARD_ENABLE_CMD_RX|MEMCARD_ENABLE_DAT_RX); |
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45 | } |
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46 | |
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47 | static void memcard_send_command(unsigned char cmd, unsigned int arg) |
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48 | { |
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49 | unsigned char packet[6]; |
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50 | int a; |
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51 | int i; |
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52 | unsigned char data; |
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53 | unsigned char crc; |
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54 | |
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55 | packet[0] = cmd | 0x40; |
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56 | packet[1] = ((arg >> 24) & 0xff); |
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57 | packet[2] = ((arg >> 16) & 0xff); |
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58 | packet[3] = ((arg >> 8) & 0xff); |
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59 | packet[4] = (arg & 0xff); |
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60 | |
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61 | crc = 0; |
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62 | for(a=0;a<5;a++) { |
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63 | data = packet[a]; |
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64 | for(i=0;i<8;i++) { |
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65 | crc <<= 1; |
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66 | if((data & 0x80) ^ (crc & 0x80)) |
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67 | crc ^= 0x09; |
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68 | data <<= 1; |
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69 | } |
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70 | } |
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71 | crc = (crc<<1) | 1; |
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72 | |
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73 | packet[5] = crc; |
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74 | |
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75 | #ifdef MEMCARD_DEBUG |
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76 | printk(">> %02x %02x %02x %02x %02x %02x\n", |
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77 | packet[0], packet[1], packet[2], packet[3], packet[4], packet[5]); |
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78 | #endif |
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79 | |
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80 | for(i=0;i<6;i++) { |
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81 | MM_WRITE(MM_MEMCARD_CMD, packet[i]); |
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82 | while(MM_READ(MM_MEMCARD_PENDING) & MEMCARD_PENDING_CMD_TX); |
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83 | } |
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84 | } |
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85 | |
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86 | static void memcard_send_dummy(void) |
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87 | { |
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88 | MM_WRITE(MM_MEMCARD_CMD, 0xff); |
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89 | while(MM_READ(MM_MEMCARD_PENDING) & MEMCARD_PENDING_CMD_TX); |
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90 | } |
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91 | |
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92 | static bool memcard_receive_command(unsigned char *buffer, int len) |
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93 | { |
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94 | int i; |
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95 | int timeout; |
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96 | |
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97 | for(i=0;i<len;i++) { |
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98 | timeout = 2000000; |
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99 | while(!(MM_READ(MM_MEMCARD_PENDING) & MEMCARD_PENDING_CMD_RX)) { |
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100 | timeout--; |
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101 | if(timeout == 0) { |
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102 | #ifdef MEMCARD_DEBUG |
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103 | printk("Command receive timeout\n"); |
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104 | #endif |
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105 | return false; |
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106 | } |
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107 | } |
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108 | buffer[i] = MM_READ(MM_MEMCARD_CMD); |
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109 | MM_WRITE(MM_MEMCARD_PENDING, MEMCARD_PENDING_CMD_RX); |
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110 | } |
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111 | |
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112 | while(!(MM_READ(MM_MEMCARD_PENDING) & MEMCARD_PENDING_CMD_RX)); |
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113 | |
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114 | #ifdef MEMCARD_DEBUG |
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115 | printk("<< "); |
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116 | for(i=0;i<len;i++) |
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117 | printk("%02x ", buffer[i]); |
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118 | printk("\n"); |
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119 | #endif |
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120 | |
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121 | return true; |
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122 | } |
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123 | |
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124 | static bool memcard_receive_command_data(unsigned char *command, |
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125 | unsigned int *data) |
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126 | { |
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127 | int i, j; |
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128 | int timeout; |
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129 | |
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130 | i = 0; |
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131 | j = 0; |
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132 | while(j < 128) { |
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133 | timeout = 2000000; |
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134 | while(!(MM_READ(MM_MEMCARD_PENDING) & |
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135 | (MEMCARD_PENDING_CMD_RX|MEMCARD_PENDING_DAT_RX))) { |
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136 | timeout--; |
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137 | if(timeout == 0) { |
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138 | #ifdef MEMCARD_DEBUG |
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139 | printk("Command receive timeout\n"); |
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140 | #endif |
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141 | return false; |
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142 | } |
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143 | } |
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144 | if(MM_READ(MM_MEMCARD_PENDING) & MEMCARD_PENDING_CMD_RX) { |
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145 | command[i++] = MM_READ(MM_MEMCARD_CMD); |
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146 | MM_WRITE(MM_MEMCARD_PENDING, MEMCARD_PENDING_CMD_RX); |
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147 | if(i == 6) |
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148 | /* disable command RX */ |
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149 | MM_WRITE(MM_MEMCARD_ENABLE, MEMCARD_ENABLE_DAT_RX); |
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150 | } |
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151 | if(MM_READ(MM_MEMCARD_PENDING) & MEMCARD_PENDING_DAT_RX) { |
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152 | data[j++] = MM_READ(MM_MEMCARD_DAT); |
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153 | MM_WRITE(MM_MEMCARD_PENDING, MEMCARD_PENDING_DAT_RX); |
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154 | } |
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155 | } |
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156 | |
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157 | /* Get CRC (ignored) */ |
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158 | for(i=0;i<2;i++) { |
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159 | while(!(MM_READ(MM_MEMCARD_PENDING) & MEMCARD_PENDING_DAT_RX)); |
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160 | #ifdef MEMCARD_DEBUG |
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161 | printk("CRC: %08x\n", MM_READ(MM_MEMCARD_DAT)); |
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162 | #endif |
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163 | MM_WRITE(MM_MEMCARD_PENDING, MEMCARD_PENDING_DAT_RX); |
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164 | } |
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165 | |
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166 | while(!(MM_READ(MM_MEMCARD_PENDING) & MEMCARD_PENDING_DAT_RX)); |
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167 | |
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168 | #ifdef MEMCARD_DEBUG |
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169 | printk("<< %02x %02x %02x %02x %02x %02x\n", |
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170 | command[0], command[1], command[2], command[3], command[4], command[5]); |
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171 | #endif |
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172 | |
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173 | //for(i=0;i<128;i++) |
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174 | // printk("%08x ", data[i]); |
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175 | //printk("\n"); |
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176 | |
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177 | return true; |
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178 | } |
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179 | |
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180 | static unsigned int block_count; |
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181 | |
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182 | static int memcard_disk_block_read(rtems_blkdev_request *r) |
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183 | { |
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184 | unsigned char b[6]; |
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185 | unsigned int i, nblocks; |
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186 | unsigned int block; |
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187 | |
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188 | block = RTEMS_BLKDEV_START_BLOCK(r); |
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189 | nblocks = r->bufnum; |
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190 | |
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191 | for(i=0;i<nblocks;i++) { |
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192 | /* CMD17 - read block */ |
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193 | memcard_start_cmd_tx(); |
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194 | memcard_send_command(17, (block+i)*BLOCK_SIZE); |
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195 | memcard_start_cmd_dat_rx(); |
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196 | if(!memcard_receive_command_data(b, (unsigned int *)r->bufs[i].buffer)) |
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197 | return -RTEMS_IO_ERROR; |
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198 | } |
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199 | |
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200 | rtems_blkdev_request_done(r, RTEMS_SUCCESSFUL); |
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201 | |
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202 | return 0; |
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203 | } |
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204 | |
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205 | static int memcard_disk_block_write(rtems_blkdev_request *r) |
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206 | { |
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207 | rtems_blkdev_request_done(r, RTEMS_IO_ERROR); |
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208 | |
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209 | return 0; |
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210 | } |
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211 | |
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212 | static rtems_status_code memcard_init(void) |
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213 | { |
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214 | unsigned char b[17]; |
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215 | unsigned int rca; |
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216 | unsigned int block_shift; |
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217 | unsigned int c_size; |
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218 | unsigned int c_size_mult; |
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219 | |
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220 | MM_WRITE(MM_MEMCARD_CLK2XDIV, 250); |
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221 | |
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222 | /* CMD0 */ |
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223 | memcard_start_cmd_tx(); |
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224 | memcard_send_command(0, 0); |
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225 | |
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226 | memcard_send_dummy(); |
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227 | |
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228 | /* CMD8 */ |
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229 | memcard_send_command(8, 0x1aa); |
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230 | memcard_start_cmd_rx(); |
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231 | if(!memcard_receive_command(b, 6)) return RTEMS_IO_ERROR; |
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232 | |
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233 | /* ACMD41 - initialize */ |
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234 | while(1) { |
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235 | memcard_start_cmd_tx(); |
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236 | memcard_send_command(55, 0); |
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237 | memcard_start_cmd_rx(); |
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238 | if(!memcard_receive_command(b, 6)) return RTEMS_IO_ERROR; |
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239 | memcard_start_cmd_tx(); |
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240 | memcard_send_command(41, 0x00300000); |
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241 | memcard_start_cmd_rx(); |
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242 | if(!memcard_receive_command(b, 6)) return RTEMS_IO_ERROR; |
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243 | if(b[1] & 0x80) break; |
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244 | #ifdef MEMCARD_DEBUG |
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245 | printk("Card is busy, retrying\n"); |
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246 | #endif |
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247 | } |
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248 | |
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249 | /* CMD2 - get CID */ |
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250 | memcard_start_cmd_tx(); |
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251 | memcard_send_command(2, 0); |
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252 | memcard_start_cmd_rx(); |
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253 | if(!memcard_receive_command(b, 17)) return RTEMS_IO_ERROR; |
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254 | |
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255 | /* CMD3 - get RCA */ |
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256 | memcard_start_cmd_tx(); |
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257 | memcard_send_command(3, 0); |
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258 | memcard_start_cmd_rx(); |
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259 | if(!memcard_receive_command(b, 6)) return RTEMS_IO_ERROR; |
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260 | rca = (((unsigned int)b[1]) << 8)|((unsigned int)b[2]); |
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261 | #ifdef MEMCARD_DEBUG |
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262 | printk("RCA: %04x\n", rca); |
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263 | #endif |
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264 | |
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265 | /* CMD9 - get CSD */ |
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266 | memcard_start_cmd_tx(); |
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267 | memcard_send_command(9, rca << 16); |
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268 | memcard_start_cmd_rx(); |
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269 | if(!memcard_receive_command(b, 17)) return RTEMS_IO_ERROR; |
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270 | |
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271 | if(((b)[0] >> 6) != 0) |
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272 | return RTEMS_IO_ERROR; |
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273 | |
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274 | block_shift = ((unsigned int)(b)[5] & 0xf); |
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275 | c_size = ((((unsigned int)(b)[6] & 0x3) << 10) |
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276 | + (((unsigned int)(b)[7]) << 2) |
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277 | + ((((unsigned int)(b)[8]) >> 6) & 0x3)); |
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278 | c_size_mult = ((((b)[9] & 0x3) << 1) + (((b)[10] >> 7) & 0x1)); |
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279 | block_count = (c_size + 1) * (1U << (c_size_mult + 2)); |
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280 | |
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281 | /* convert to 512-byte blocks for the sake of simplicity */ |
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282 | if(block_shift < 9) |
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283 | return RTEMS_IO_ERROR; |
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284 | block_count <<= block_shift - 9; |
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285 | |
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286 | /* CMD7 - select card */ |
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287 | memcard_start_cmd_tx(); |
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288 | memcard_send_command(7, rca << 16); |
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289 | memcard_start_cmd_rx(); |
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290 | if(!memcard_receive_command(b, 6)) return RTEMS_IO_ERROR; |
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291 | |
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292 | /* ACMD6 - set bus width */ |
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293 | memcard_start_cmd_tx(); |
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294 | memcard_send_command(55, rca << 16); |
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295 | memcard_start_cmd_rx(); |
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296 | if(!memcard_receive_command(b, 6)) return RTEMS_IO_ERROR; |
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297 | memcard_start_cmd_tx(); |
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298 | memcard_send_command(6, 2); |
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299 | memcard_start_cmd_rx(); |
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300 | if(!memcard_receive_command(b, 6)) return RTEMS_IO_ERROR; |
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301 | |
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302 | MM_WRITE(MM_MEMCARD_CLK2XDIV, 3); |
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303 | |
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304 | return RTEMS_SUCCESSFUL; |
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305 | } |
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306 | |
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307 | static int memcard_disk_ioctl(rtems_disk_device *dd, uint32_t req, void *arg) |
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308 | { |
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309 | if (req == RTEMS_BLKIO_REQUEST) { |
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310 | rtems_blkdev_request *r = (rtems_blkdev_request *)arg; |
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311 | switch (r->req) { |
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312 | case RTEMS_BLKDEV_REQ_READ: |
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313 | return memcard_disk_block_read(r); |
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314 | case RTEMS_BLKDEV_REQ_WRITE: |
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315 | return memcard_disk_block_write(r); |
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316 | default: |
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317 | errno = EINVAL; |
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318 | return -1; |
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319 | } |
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320 | } else if (req == RTEMS_BLKIO_CAPABILITIES) { |
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321 | *(uint32_t *)arg = RTEMS_BLKDEV_CAP_MULTISECTOR_CONT; |
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322 | return 0; |
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323 | } else { |
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324 | errno = EINVAL; |
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325 | return -1; |
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326 | } |
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327 | } |
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328 | |
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329 | static rtems_status_code memcard_disk_init( |
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330 | rtems_device_major_number major, rtems_device_minor_number minor, |
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331 | void *arg) |
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332 | { |
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333 | rtems_status_code sc; |
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334 | dev_t dev; |
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335 | |
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336 | sc = rtems_disk_io_initialize(); |
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337 | RTEMS_CHECK_SC(sc, "Initialize RTEMS disk IO"); |
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338 | |
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339 | dev = rtems_filesystem_make_dev_t(major, 0); |
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340 | |
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341 | sc = memcard_init(); |
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342 | RTEMS_CHECK_SC(sc, "Initialize memory card"); |
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343 | |
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344 | sc = rtems_disk_create_phys(dev, BLOCK_SIZE, block_count, memcard_disk_ioctl, |
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345 | NULL, "/dev/memcard"); |
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346 | RTEMS_CHECK_SC(sc, "Create disk device"); |
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347 | |
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348 | return RTEMS_SUCCESSFUL; |
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349 | } |
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350 | |
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351 | |
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352 | static const rtems_driver_address_table memcard_disk_ops = { |
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353 | .initialization_entry = memcard_disk_init, |
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354 | .open_entry = rtems_blkdev_generic_open, |
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355 | .close_entry = rtems_blkdev_generic_close, |
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356 | .read_entry = rtems_blkdev_generic_read, |
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357 | .write_entry = rtems_blkdev_generic_write, |
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358 | .control_entry = rtems_blkdev_generic_ioctl |
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359 | }; |
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360 | |
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361 | rtems_status_code memcard_register(void) |
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362 | { |
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363 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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364 | rtems_device_major_number major = 0; |
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365 | |
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366 | sc = rtems_io_register_driver(0, &memcard_disk_ops, &major); |
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367 | RTEMS_CHECK_SC(sc, "Register disk memory card driver"); |
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368 | |
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369 | return RTEMS_SUCCESSFUL; |
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370 | } |
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