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annotate packages/io/flash/current/src/flash_legacy.h @ 1777:c16341b1bac6 default tip

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* Added execute permissions to files missed in conversion from CVS
author alexs
date Mon, 12 Oct 2009 02:26:09 +0100
parents 8667859d61ab
children
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1 //==========================================================================
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2 //
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3 // flash_legacy.h
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4 //
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5 // Flash programming - some internal implementation details.
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6 //
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7 //==========================================================================
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // copyright (C) 2004 Andrew Lunn
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12 // Copyright (C) 2003 Gary Thomas
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13 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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14 // Copyright (C) 2004 eCosCentric Limited
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15 //
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16 // eCos is free software; you can redistribute it and/or modify it under
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17 // the terms of the GNU General Public License as published by the Free
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18 // Software Foundation; either version 2 or (at your option) any later version.
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19 //
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20 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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21 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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22 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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23 // for more details.
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24 //
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25 // You should have received a copy of the GNU General Public License along
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26 // with eCos; if not, write to the Free Software Foundation, Inc.,
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27 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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28 //
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29 // As a special exception, if other files instantiate templates or use macros
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30 // or inline functions from this file, or you compile this file and link it
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31 // with other works to produce a work based on this file, this file does not
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32 // by itself cause the resulting work to be covered by the GNU General Public
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33 // License. However the source code for this file must still be made available
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34 // in accordance with section (3) of the GNU General Public License.
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35 //
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36 // This exception does not invalidate any other reasons why a work based on
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37 // this file might be covered by the GNU General Public License.
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38 //
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39 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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40 // at http://sources.redhat.com/ecos/ecos-license/
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41 // -------------------------------------------
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42 //####ECOSGPLCOPYRIGHTEND####
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43 //==========================================================================
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44 //#####DESCRIPTIONBEGIN####
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45 //
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46 // Author(s): gthomas
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47 // Contributors: gthomas, Andrew Lunn
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48 // Date: 2000-07-14
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49 // Purpose:
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50 // Description:
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51 //
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52 //####DESCRIPTIONEND####
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53 //
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54 //==========================================================================
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55
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56 #include <pkgconf/system.h>
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57 #include <pkgconf/io_flash.h>
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58 #include <cyg/infra/cyg_type.h>
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59 #include <cyg/hal/hal_arch.h>
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60 #include <cyg/hal/hal_cache.h>
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61
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62
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63 // Some FLASH devices may require additional support, e.g. to turn on
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64 // appropriate voltage drivers, before any operation.
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65 #ifdef CYGIMP_FLASH_ENABLE
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66 # define FLASH_Enable CYGIMP_FLASH_ENABLE
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67 extern void CYGIMP_FLASH_ENABLE(void *, void *);
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68 #else
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69 # define FLASH_Enable(_start_, _end_) CYG_EMPTY_STATEMENT
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70 #endif
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71 #ifdef CYGIMP_FLASH_DISABLE
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72 # define FLASH_Disable CYGIMP_FLASH_DISABLE
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73 extern void CYGIMP_FLASH_DISABLE(void *, void *);
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74 #else
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75 # define FLASH_Disable(_start_, _end_) CYG_EMPTY_STATEMENT
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76 #endif
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77
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78 //
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79 // Some platforms have a DIP switch or jumper that tells the software that
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80 // the flash is write protected.
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81 //
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82 #ifdef CYGSEM_IO_FLASH_SOFT_WRITE_PROTECT
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83 externC cyg_bool plf_flash_query_soft_wp(void *addr, int len);
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84 #endif
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85
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86 //---------------------------------------------------------------------------
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87 // If all of the flash devices handle cache themselves, or do not need any
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88 // special cache treatment, then the flash macros can be no-ops.
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89 #ifndef CYGHWR_IO_FLASH_DEVICE_NEEDS_CACHE_HANDLED
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90 # undef HAL_FLASH_CACHES_OFF
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91 # undef HAL_FLASH_CACHES_ON
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92 # undef HAL_FLASH_CACHES_STATE
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93 # define HAL_FLASH_CACHES_OFF(_d_, _i_) CYG_EMPTY_STATEMENT
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94 # define HAL_FLASH_CACHES_ON(_d_, _i_) CYG_EMPTY_STATEMENT
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95 # define HAL_FLASH_CACHES_STATE(_d_, _i_) CYG_EMPTY_STATEMENT
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96 #endif
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97
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98 // Execution of flash code must be done inside a
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99 // HAL_FLASH_CACHES_OFF/HAL_FLASH_CACHES_ON region - disabling the
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100 // cache on unified cache systems is necessary to prevent burst access
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101 // to the flash area being programmed. With Harvard style caches, only
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102 // the data cache needs to be disabled, but the instruction cache is
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103 // disabled for consistency.
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104
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105 // Targets may provide alternative implementations for these macros in
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106 // the hal_cache.h (or var/plf) files.
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107
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108 // The first part below is a generic, optimal implementation. The
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109 // second part is the old implementation that has been tested to work
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110 // on some targets - but it is not be suitable for targets that would
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111 // do burst access to the flash (it does not disable the data cache).
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112
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113 // Both implementations must be called with interrupts disabled.
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114
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115 // NOTE: Do _not_ change any of the below macros without checking that
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116 // the changed code still works on _all_ platforms that rely on these
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117 // macros. There is no such thing as logical and correct when dealing
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118 // with different cache and IO models, so _do not_ mess with this code
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119 // unless you test it properly afterwards.
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120
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121 #ifndef HAL_FLASH_CACHES_OFF
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122
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123 // Some drivers have only been tested with the old macros below.
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124 #ifndef HAL_FLASH_CACHES_OLD_MACROS
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125
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126 #ifdef HAL_CACHE_UNIFIED
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127
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128 // Note: the ucache code has not been tested yet on any target.
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129 #define HAL_FLASH_CACHES_OFF(_d_, _i_) \
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130 CYG_MACRO_START \
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131 _i_ = 0; /* avoids warning */ \
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132 HAL_UCACHE_IS_ENABLED(_d_); \
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133 HAL_UCACHE_SYNC(); \
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134 HAL_UCACHE_INVALIDATE_ALL(); \
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135 HAL_UCACHE_DISABLE(); \
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136 CYG_MACRO_END
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137
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138 #define HAL_FLASH_CACHES_ON(_d_, _i_) \
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139 CYG_MACRO_START \
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140 if (_d_) HAL_UCACHE_ENABLE(); \
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141 CYG_MACRO_END
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142
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143 #else // HAL_CACHE_UNIFIED
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144
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145 #define HAL_FLASH_CACHES_OFF(_d_, _i_) \
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146 CYG_MACRO_START \
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147 _i_ = 0; /* avoids warning */ \
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148 HAL_DCACHE_IS_ENABLED(_d_); \
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149 HAL_DCACHE_SYNC(); \
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150 HAL_DCACHE_INVALIDATE_ALL(); \
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151 HAL_DCACHE_DISABLE(); \
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152 HAL_ICACHE_INVALIDATE_ALL(); \
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153 CYG_MACRO_END
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154
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155 #define HAL_FLASH_CACHES_ON(_d_, _i_) \
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156 CYG_MACRO_START \
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157 if (_d_) HAL_DCACHE_ENABLE(); \
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158 CYG_MACRO_END
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159
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160 #endif // HAL_CACHE_UNIFIED
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161
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162 #else // HAL_FLASH_CACHES_OLD_MACROS
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163
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164 // Note: This implementation is broken as it will always enable the i-cache
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165 // even if it was not enabled before. It also doesn't work if the
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166 // target uses burst access to flash since the d-cache is left enabled.
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167 // However, this does not mean you can change this code! Leave it as
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168 // is - if you want a different implementation, provide it in the
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169 // arch/var/platform cache header file.
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170
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171 #define HAL_FLASH_CACHES_OFF(_d_, _i_) \
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172 _d_ = 0; /* avoids warning */ \
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173 _i_ = 0; /* avoids warning */ \
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174 HAL_DCACHE_SYNC(); \
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175 HAL_ICACHE_DISABLE();
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176
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177 #define HAL_FLASH_CACHES_ON(_d_, _i_) \
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178 HAL_ICACHE_ENABLE();
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179
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180 #endif // HAL_FLASH_CACHES_OLD_MACROS
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181
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182 #endif // HAL_FLASH_CACHES_OFF
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183
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184 #ifndef HAL_FLASH_CACHES_STATE
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185 # define HAL_FLASH_CACHES_STATE(_d_, _i_) int _d_, _i_
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186 #endif