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annotate packages/devs/flash/arm/iq80310/current/src/flash_erase_block.c @ 152:f935b880e96c

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Merge from eCos master repository on 2001-02-14-01:27:14-GMT
author jlarmour
date Thu, 15 Feb 2001 18:18:11 +0000
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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, msalter
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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 char *block)
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56 {
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57 volatile unsigned char *ROM;
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58 unsigned short stat;
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59 int timeout = 50000;
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60 int cache_on;
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61 int len;
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62
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63 HAL_DCACHE_IS_ENABLED(cache_on);
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64 if (cache_on) {
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65 HAL_DCACHE_SYNC();
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66 HAL_DCACHE_DISABLE();
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67 }
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68
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69
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70 // First 4K page of flash at physcial address zero is
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71 // virtually mapped to address 0xa0000000.
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72 ROM = FLASH_P2V((unsigned)block & 0xFF800000);
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73
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74 // Clear any error conditions
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75 ROM[0] = FLASH_Clear_Status;
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76
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77 // Erase block
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78 ROM[0] = FLASH_Block_Erase;
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79 *FLASH_P2V(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 // Restore ROM to "normal" mode
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86 ROM[0] = FLASH_Reset;
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87
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88 // If an error was reported, see if the block erased anyway
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89 if (stat & 0x7E) {
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90 len = FLASH_BLOCK_SIZE;
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91 while (len > 0) {
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92 if (*FLASH_P2V(block) != 0xFF)
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93 break;
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94 block++;
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95 len -= sizeof(*block);
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96 }
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97 if (len == 0) stat = 0;
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98 }
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99
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100 if (cache_on) {
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101 HAL_DCACHE_ENABLE();
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102 }
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103
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104 return stat;
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105 }