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annotate packages/io/flash/current/src/flash_legacy.h @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents a2f5434df2cb
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) 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): gthomas
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43 // Contributors: gthomas, Andrew Lunn
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44 // Date: 2000-07-14
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45 // Purpose:
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46 // Description:
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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 #include <pkgconf/system.h>
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53 #include <pkgconf/io_flash.h>
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54 #include <cyg/infra/cyg_type.h>
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55 #include <cyg/hal/hal_arch.h>
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56 #include <cyg/hal/hal_cache.h>
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57
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58
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59 // Some FLASH devices may require additional support, e.g. to turn on
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60 // appropriate voltage drivers, before any operation.
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61 #ifdef CYGIMP_FLASH_ENABLE
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62 # define FLASH_Enable(__start, __end) CYGIMP_FLASH_ENABLE((void *)__start, (void *)__end)
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63 extern void CYGIMP_FLASH_ENABLE(void *, void *);
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64 #else
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65 # define FLASH_Enable(_start_, _end_) CYG_EMPTY_STATEMENT
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66 #endif
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67 #ifdef CYGIMP_FLASH_DISABLE
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68 # define FLASH_Disable(__start, __end) CYGIMP_FLASH_DISABLE((void *)__start, (void *)__end)
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69 extern void CYGIMP_FLASH_DISABLE(void *, void *);
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70 #else
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71 # define FLASH_Disable(_start_, _end_) CYG_EMPTY_STATEMENT
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72 #endif
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73
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74 //
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75 // Some platforms have a DIP switch or jumper that tells the software that
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76 // the flash is write protected.
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77 //
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78 #ifdef CYGSEM_IO_FLASH_SOFT_WRITE_PROTECT
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79 externC cyg_bool plf_flash_query_soft_wp(void *addr, int len);
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80 #endif
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81
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82 //---------------------------------------------------------------------------
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83 // If all of the flash devices handle cache themselves, or do not need any
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84 // special cache treatment, then the flash macros can be no-ops.
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85 #ifndef CYGHWR_IO_FLASH_DEVICE_NEEDS_CACHE_HANDLED
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86 # undef HAL_FLASH_CACHES_OFF
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87 # undef HAL_FLASH_CACHES_ON
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88 # undef HAL_FLASH_CACHES_STATE
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89 # define HAL_FLASH_CACHES_OFF(_d_, _i_) CYG_EMPTY_STATEMENT
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90 # define HAL_FLASH_CACHES_ON(_d_, _i_) CYG_EMPTY_STATEMENT
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91 # define HAL_FLASH_CACHES_STATE(_d_, _i_) CYG_EMPTY_STATEMENT
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92 #endif
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93
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94 // Execution of flash code must be done inside a
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95 // HAL_FLASH_CACHES_OFF/HAL_FLASH_CACHES_ON region - disabling the
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96 // cache on unified cache systems is necessary to prevent burst access
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97 // to the flash area being programmed. With Harvard style caches, only
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98 // the data cache needs to be disabled, but the instruction cache is
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99 // disabled for consistency.
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100
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101 // Targets may provide alternative implementations for these macros in
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102 // the hal_cache.h (or var/plf) files.
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103
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104 // The first part below is a generic, optimal implementation. The
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105 // second part is the old implementation that has been tested to work
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106 // on some targets - but it is not be suitable for targets that would
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107 // do burst access to the flash (it does not disable the data cache).
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108
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109 // Both implementations must be called with interrupts disabled.
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110
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111 // NOTE: Do _not_ change any of the below macros without checking that
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112 // the changed code still works on _all_ platforms that rely on these
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113 // macros. There is no such thing as logical and correct when dealing
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114 // with different cache and IO models, so _do not_ mess with this code
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115 // unless you test it properly afterwards.
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116
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117 #ifndef HAL_FLASH_CACHES_OFF
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118
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119 // Some drivers have only been tested with the old macros below.
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120 #ifndef HAL_FLASH_CACHES_OLD_MACROS
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121
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122 #ifdef HAL_CACHE_UNIFIED
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123
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124 // Note: the ucache code has not been tested yet on any target.
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125 #define HAL_FLASH_CACHES_OFF(_d_, _i_) \
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126 CYG_MACRO_START \
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127 _i_ = 0; /* avoids warning */ \
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128 HAL_UCACHE_IS_ENABLED(_d_); \
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129 HAL_UCACHE_SYNC(); \
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130 HAL_UCACHE_INVALIDATE_ALL(); \
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131 HAL_UCACHE_DISABLE(); \
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132 CYG_MACRO_END
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133
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134 #define HAL_FLASH_CACHES_ON(_d_, _i_) \
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135 CYG_MACRO_START \
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136 if (_d_) HAL_UCACHE_ENABLE(); \
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137 CYG_MACRO_END
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138
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139 #else // HAL_CACHE_UNIFIED
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140
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141 #define HAL_FLASH_CACHES_OFF(_d_, _i_) \
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142 CYG_MACRO_START \
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143 _i_ = 0; /* avoids warning */ \
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144 HAL_DCACHE_IS_ENABLED(_d_); \
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145 HAL_DCACHE_SYNC(); \
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146 HAL_DCACHE_INVALIDATE_ALL(); \
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147 HAL_DCACHE_DISABLE(); \
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148 HAL_ICACHE_INVALIDATE_ALL(); \
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149 CYG_MACRO_END
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150
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151 #define HAL_FLASH_CACHES_ON(_d_, _i_) \
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152 CYG_MACRO_START \
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153 if (_d_) HAL_DCACHE_ENABLE(); \
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154 CYG_MACRO_END
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155
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156 #endif // HAL_CACHE_UNIFIED
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157
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158 #else // HAL_FLASH_CACHES_OLD_MACROS
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159
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160 // Note: This implementation is broken as it will always enable the i-cache
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161 // even if it was not enabled before. It also doesn't work if the
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162 // target uses burst access to flash since the d-cache is left enabled.
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163 // However, this does not mean you can change this code! Leave it as
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164 // is - if you want a different implementation, provide it in the
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165 // arch/var/platform cache header file.
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166
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167 #define HAL_FLASH_CACHES_OFF(_d_, _i_) \
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168 _d_ = 0; /* avoids warning */ \
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169 _i_ = 0; /* avoids warning */ \
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170 HAL_DCACHE_SYNC(); \
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171 HAL_ICACHE_DISABLE();
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172
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173 #define HAL_FLASH_CACHES_ON(_d_, _i_) \
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174 HAL_ICACHE_ENABLE();
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175
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176 #endif // HAL_FLASH_CACHES_OLD_MACROS
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177
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178 #endif // HAL_FLASH_CACHES_OFF
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179
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180 #ifndef HAL_FLASH_CACHES_STATE
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181 # define HAL_FLASH_CACHES_STATE(_d_, _i_) int _d_, _i_
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182 #endif