Mercurial > flash_v2

annotate packages/devs/flash/intel/bootblock/current/src/flash_erase_block.c @ 136:a9ac27ec7abc ecos-sw-2000-11-17

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Merge from eCos master repository on 2000-11-17-18:24:25-GMT
author jlarmour
date Fri, 17 Nov 2000 23:16:43 +0000
parents
children e0c0827131d1
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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 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): gthomas
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35 // Contributors: gthomas
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36 // Date: 2000-07-14
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37 // Purpose:
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38 // Description:
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39 //
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40 //####DESCRIPTIONEND####
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41 //
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42 //==========================================================================
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43
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44 #include "flash.h"
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45
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46 #include <pkgconf/hal.h>
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47 #include <cyg/hal/hal_arch.h>
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48 #include <cyg/hal/hal_cache.h>
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49
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50 //
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51 // CAUTION! This code must be copied to RAM before execution. Therefore,
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52 // it must not contain any code which might be position dependent!
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53 //
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54
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55 int flash_erase_block(volatile unsigned short *block)
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56 {
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57 volatile unsigned short *ROM, *sb;
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58 unsigned long stat;
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59 int timeout = 50000;
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60 int len, block_size;
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61
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62 GO_SLOW
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63
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64 ROM = (volatile unsigned short *)((unsigned long)block & 0xFF800000);
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65
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66 // Clear any error conditions
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67 ROM[0] = FLASH_Clear_Status;
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68
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69 len = FLASH_BLOCK_SIZE;
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70 if (((unsigned long)block - (unsigned long)ROM) < FLASH_BLOCK_SIZE) {
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71 block_size = FLASH_BOOT_BLOCK_SIZE; // First 8 blocks are only 8Kx2 each
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72 } else {
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73 block_size = FLASH_BLOCK_SIZE;
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74 }
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75 sb = block;
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76 while (len > 0) {
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77 // Erase block
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78 ROM[0] = FLASH_Block_Erase;
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79 *block = FLASH_Confirm;
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80 timeout = 5000000;
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81 while(((stat = ROM[0]) & FLASH_Status_Ready) != FLASH_Status_Ready) {
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82 if (--timeout == 0) break;
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83 }
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84
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85 len -= block_size;
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86 block += block_size / sizeof(*block);
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87 }
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88
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89 // Restore ROM to "normal" mode
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90 ROM[0] = FLASH_Reset;
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91
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92 // If an error was reported, see if the block erased anyway
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93 if (stat & 0x007E007E) {
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94 len = FLASH_BLOCK_SIZE;
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95 block = sb;
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96 while (len > 0) {
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97 if (*block++ != 0xFFFFFFFF) break;
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98 len -= sizeof(*block);
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99 }
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100 if (len == 0) stat = 0;
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101 }
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102
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103 GO_FAST
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104
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105 return stat;
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106 }