Mercurial > flash_v2

annotate packages/io/flash/current/include/flash_dev.h @ 154:e2d866e32dac

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Merge from eCos master repository on 2001-02-26-23:18:05-GMT
author jlarmour
date Tue, 27 Feb 2001 01:21:45 +0000
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children 0d0f03f76f6a
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1 #ifndef CYGONCE_IO_FLASH_FLASH_DEV_H
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2 #define CYGONCE_IO_FLASH_FLASH_DEV_H
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3 //==========================================================================
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4 //
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5 // flash_dev.h
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6 //
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7 // Common flash device driver definitions
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8 //
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9 //==========================================================================
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10 //####COPYRIGHTBEGIN####
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11 //
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12 // -------------------------------------------
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13 // The contents of this file are subject to the Red Hat eCos Public License
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14 // Version 1.1 (the "License"); you may not use this file except in
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15 // compliance with the License. You may obtain a copy of the License at
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16 // http://www.redhat.com/
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17 //
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18 // Software distributed under the License is distributed on an "AS IS"
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19 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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20 // License for the specific language governing rights and limitations under
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21 // the License.
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22 //
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23 // The Original Code is eCos - Embedded Configurable Operating System,
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24 // released September 30, 1998.
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25 //
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26 // The Initial Developer of the Original Code is Red Hat.
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27 // Portions created by Red Hat are
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28 // Copyright (C) 1998, 1999, 2000, 2001 Red Hat, Inc.
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29 // All Rights Reserved.
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30 // -------------------------------------------
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31 //
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32 //####COPYRIGHTEND####
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33 //==========================================================================
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34 //#####DESCRIPTIONBEGIN####
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35 //
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36 // Author(s): hmt
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37 // Contributors: hmt, jskov
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38 // Date: 2001-02-22
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39 // Purpose: Define common flash device driver definitions
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40 // Description: The flash_data_t type is used for accessing
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41 // devices at the correct width.
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42 // The FLASHWORD macro must be used to create constants
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43 // of suitable width.
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44 // The FLASH_P2V macro can be used to fix up non-linear
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45 // mappings of flash blocks (defaults to a linear
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46 // implementation).
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47 //
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48 //####DESCRIPTIONEND####
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49 //
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50 //==========================================================================
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51
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52 #ifdef _FLASH_PRIVATE_
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53
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54 // ------------------------------------------------------------------------
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55 //
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56 // No mapping on this target - but these casts would be needed if some
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57 // manipulation did occur. An example of this might be:
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58 // // First 4K page of flash at physical address zero is
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59 // // virtually mapped at address 0xa0000000.
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60 // #define FLASH_P2V(x) ((volatile flash_t *)(((unsigned)(x) < 0x1000) ?
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61 // ((unsigned)(x) | 0xa0000000) :
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62 // (unsigned)(x)))
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63
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64 #ifndef FLASH_P2V
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65 #define FLASH_P2V( _a_ ) ((volatile flash_t *)((unsigned int)(_a_)))
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66 #endif
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67
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68 // ------------------------------------------------------------------------
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69 //
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70 // This generic code is intended to deal with all shapes and orientations
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71 // of Intel StrataFlash. Trademarks &c belong to their respective owners.
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72 //
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73 // It therefore needs some trickery to define the constants and accessor
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74 // types that we use to interact with the device or devices.
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75 //
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76 // The assumptions are that
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77 // o Parallel devices, we write to, with the "opcode" replicated per
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78 // device
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79 // o The "opcode" and status returns exist only in the low byte of the
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80 // device's interface regardless of its width.
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81 // o Hence opcodes and status are only one byte.
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82 // An exception is the test for succesfully erased data.
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83 //
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84 // ------------------------------------------------------------------------
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85
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86 #if 8 == CYGNUM_FLASH_WIDTH
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87
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88 # if 1 == CYGNUM_FLASH_INTERLEAVE
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89 # define FLASHWORD( k ) ((flash_data_t)(k)) // To narrow a 16-bit constant
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90 typedef cyg_uint8 flash_data_t;
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91 # elif 2 == CYGNUM_FLASH_INTERLEAVE
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92 // 2 devices to make 16-bit
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93 # define FLASHWORD( k ) ((k)+((k)<<8))
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94 typedef cyg_uint16 flash_data_t;
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95 # elif 4 == CYGNUM_FLASH_INTERLEAVE
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96 // 4 devices to make 32-bit
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97 # define FLASHWORD( k ) ((k)+((k)<<8)+((k)<<16)+((k)<<24))
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98 typedef cyg_uint32 flash_data_t;
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99 # elif 8 == CYGNUM_FLASH_INTERLEAVE
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100 // 8 devices to make 64-bit - intermediate requires explicit widening
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101 # define FLASHWORD32( k ) ((flash_data_t)((k)+((k)<<8)+((k)<<16)+((k)<<24)))
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102 # define FLASHWORD( k ) (FLASHWORD32( k ) + (FLASHWORD32( k ) << 32));
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103 typedef cyg_uint64 flash_data_t;
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104 # else
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105 # error How many 8-bit flash devices?
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106 # endif
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107
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108 #elif 16 == CYGNUM_FLASH_WIDTH
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109
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110 # if 1 == CYGNUM_FLASH_INTERLEAVE
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111 # define FLASHWORD( k ) (k)
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112 typedef cyg_uin16 flash_data_t;
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113 # elif 2 == CYGNUM_FLASH_INTERLEAVE
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114 // 2 devices to make 32-bit
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115 # define FLASHWORD( k ) ((k)+((k)<<16))
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116 typedef cyg_uint32 flash_data_t;
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117 # elif 2 == CYGNUM_FLASH_INTERLEAVE
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118 // 4 devices to make 64-bit - intermediate requires explicit widening
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119 # define FLASHWORD32( k ) ((flash_data_t)((k)+((k)<<16)))
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120 # define FLASHWORD( k ) (FLASHWORD32( k ) + (FLASHWORD32( k ) << 32));
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121 typedef cyg_uint64 flash_data_t;
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122 # else
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123 # error How many 16-bit flash devices?
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124 # endif
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125
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126 #elif 32 == CYGNUM_FLASH_WIDTH
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127
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128 # if 1 == CYGNUM_FLASH_INTERLEAVE
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129 # define FLASHWORD( k ) (k)
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130 typedef cyg_uint32 flash_data_t;
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131 # elif 2 == CYGNUM_FLASH_INTERLEAVE
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132 // 2 devices to make 64-bit - intermediate requires explicit widening
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133 # define FLASHWORD32( k ) ((flash_data_t)(k))
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134 # define FLASHWORD( k ) (FLASHWORD32( k ) + (FLASHWORD32( k ) << 32));
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135 typedef cyg_uint64 flash_data_t;
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136 # else
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137 # error How many 32-bit flash devices?
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138 # endif
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139
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140 #else
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141 # error What flash width?
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142 #endif
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143
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144 // Data (not) that we read back:
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145 #if 0 == CYGNUM_FLASH_BLANK
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146 # define FLASH_BlankValue ((flash_data_t)0)
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147 #elif 1 == CYGNUM_FLASH_BLANK
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148 # define FLASH_BlankValue ((flash_data_t)(-1ll))
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149 #else
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150 # error What blank value?
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151 #endif
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152
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153 #endif // _FLASH_PRIVATE_
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154
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155 #endif // CYGONCE_IO_FLASH_FLASH_DEV_H
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156 //----------------------------------------------------------------------------
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157 // end of flash_dev.h