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annotate packages/devs/flash/arm/iq80310/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 f935b880e96c
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####
152
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): gthomas
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44 // Contributors: gthomas, msalter
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45 // Date: 2000-07-14
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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 "flash.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 unsigned char *block)
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65 {
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66 volatile unsigned char *ROM;
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67 unsigned short stat;
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68 int timeout = 50000;
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69 int cache_on;
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70 int len;
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71
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72 HAL_DCACHE_IS_ENABLED(cache_on);
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73 if (cache_on) {
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74 HAL_DCACHE_SYNC();
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75 HAL_DCACHE_DISABLE();
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76 }
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77
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78
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79 // First 4K page of flash at physcial address zero is
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80 // virtually mapped to address 0xa0000000.
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81 ROM = FLASH_P2V((unsigned)block & 0xFF800000);
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82
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83 // Clear any error conditions
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84 ROM[0] = FLASH_Clear_Status;
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85
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86 // Erase block
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87 ROM[0] = FLASH_Block_Erase;
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88 *FLASH_P2V(block) = FLASH_Confirm;
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89 timeout = 5000000;
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90 while(((stat = ROM[0]) & FLASH_Status_Ready) != FLASH_Status_Ready) {
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91 if (--timeout == 0) break;
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92 }
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93
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94 // Restore ROM to "normal" mode
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95 ROM[0] = FLASH_Reset;
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96
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97 // If an error was reported, see if the block erased anyway
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98 if (stat & 0x7E) {
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99 len = FLASH_BLOCK_SIZE;
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100 while (len > 0) {
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101 if (*FLASH_P2V(block) != 0xFF)
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102 break;
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103 block++;
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104 len -= sizeof(*block);
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105 }
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106 if (len == 0) stat = 0;
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107 }
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108
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109 if (cache_on) {
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110 HAL_DCACHE_ENABLE();
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111 }
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112
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113 return stat;
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114 }