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annotate packages/devs/flash/intel/strata/current/src/flash_erase_block.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents 511f4dc167f6
children d2c90368aeef
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1 //==========================================================================
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2 //
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3 // flash_erase_block.c
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4 //
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5 // Flash programming
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6 //
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7 //==========================================================================
208
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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 Red Hat, 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 version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): gthomas, hmt
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44 // Contributors: gthomas
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45 // Date: 2001-02-14
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46 // Purpose:
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47 // Description:
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48 //
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49 //####DESCRIPTIONEND####
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50 //
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51 //==========================================================================
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52
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53 #include "strata.h"
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54
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55 #include <pkgconf/hal.h>
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56 #include <cyg/hal/hal_arch.h>
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57 #include <cyg/hal/hal_cache.h>
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58
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59 //
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60 // CAUTION! This code must be copied to RAM before execution. Therefore,
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61 // it must not contain any code which might be position dependent!
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62 //
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63
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64 int flash_erase_block(volatile flash_t *block, unsigned int block_size)
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65 {
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66 volatile flash_t *ROM;
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67 flash_t stat = 0;
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68 int timeout = 50000;
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69 int cache_on;
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70 int len, block_len, erase_block_size;
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71 volatile flash_t *eb;
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72
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73 HAL_DCACHE_IS_ENABLED(cache_on);
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74 if (cache_on) {
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75 HAL_DCACHE_SYNC();
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76 HAL_DCACHE_DISABLE();
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77 }
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78
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79 // Get base address and map addresses to virtual addresses
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80 ROM = FLASH_P2V(CYGNUM_FLASH_BASE_MASK & (unsigned int)block);
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81 eb = block = FLASH_P2V(block);
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82 block_len = block_size;
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83
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84 #ifdef CYGOPT_FLASH_IS_BOOTBLOCK
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85 #define BLOCKSIZE (0x10000*CYGNUM_FLASH_DEVICES)
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86 #define ERASE_BLOCKSIZE (0x2000*CYGNUM_FLASH_DEVICES)
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87 if ((eb - ROM) < BLOCKSIZE) {
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88 // FIXME - Handle 'boot' blocks
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89 erase_block_size = ERASE_BLOCKSIZE;
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90 } else {
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91 erase_block_size = block_size;
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92 }
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93 #else
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94 erase_block_size = block_size;
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95 #endif
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96
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97 // Clear any error conditions
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98 ROM[0] = FLASH_Clear_Status;
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99
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100 // Erase block
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101 while (block_len > 0) {
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102 ROM[0] = FLASH_Block_Erase;
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103 *eb = FLASH_Confirm;
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104 timeout = 5000000;
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105 while(((stat = ROM[0]) & FLASH_Status_Ready) != FLASH_Status_Ready) {
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106 if (--timeout == 0) break;
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107 }
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108 block_len -= erase_block_size;
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109 eb = FLASH_P2V((unsigned int)eb + erase_block_size);
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110 }
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111
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112 // Restore ROM to "normal" mode
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113 ROM[0] = FLASH_Reset;
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114
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115 // If an error was reported, see if the block erased anyway
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116 if (stat & FLASH_ErrorMask ) {
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117 len = block_size;
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118 while (len > 0) {
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119 if (*block++ != FLASH_BlankValue ) break;
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120 len -= sizeof(*block);
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121 }
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122 if (len == 0) stat = 0;
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123 }
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124
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125 if (cache_on) {
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126 HAL_DCACHE_ENABLE();
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127 }
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128
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129 return stat;
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130 }