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Merge from eCos master repository on 2001-07-31-19:15:01-BST
author jlarmour
date Tue, 31 Jul 2001 21:15:36 +0000
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children e0c0827131d1
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1 //==========================================================================
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2 //
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3 // flash_program_buf.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, 2001 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: 2001-07-17
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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
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56 flash_program_buf(volatile unsigned short *addr, unsigned short *data, int len)
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57 {
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58 volatile unsigned short *PAGE, *ROM;
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59 int timeout = 50000;
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60 int cache_on;
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61 int i, offset;
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62 unsigned short hold[FLASH_PAGE_SIZE/2];
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63
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64 HAL_DCACHE_IS_ENABLED(cache_on);
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65 if (cache_on) {
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66 HAL_DCACHE_SYNC();
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67 HAL_DCACHE_DISABLE();
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68 }
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69
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70 if (len != FLASH_PAGE_SIZE) {
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71 return FLASH_LENGTH_ERROR;
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72 }
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73
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74 ROM = (volatile unsigned short *)((unsigned long)addr & 0xFFFF0000);
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75 PAGE = (volatile unsigned short *)((unsigned long)addr & FLASH_PAGE_MASK);
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76
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77 // Copy current contents (allows for partial updates)
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78 for (i = 0; i < FLASH_PAGE_SIZE/2; i++) {
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79 hold[i] = PAGE[i];
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80 }
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81
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82 // Merge data into holding buffer
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83 offset = (unsigned long)addr & FLASH_PAGE_OFFSET;
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84 for (i = 0; i < (len/2); i++) {
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85 hold[offset+i] = data[i];
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86 }
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87
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88 // Now write the data
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89
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90 // Send lead-in sequence
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91 ROM[FLASH_Key_Addr0] = FLASH_Key0;
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92 ROM[FLASH_Key_Addr1] = FLASH_Key1;
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93
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94 // Send 'write' command
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95 ROM[FLASH_Key_Addr0] = FLASH_Program;
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96
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97 // Send one page/sector of data
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98 for (i = 0; i < FLASH_PAGE_SIZE/2; i++) {
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99 PAGE[i] = hold[i];
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100 }
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101
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102 // Wait for data to be programmed
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103 while (timeout-- > 0) {
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104 if (PAGE[(FLASH_PAGE_SIZE/2)-1] == hold[(FLASH_PAGE_SIZE/2)-1]) {
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105 break;
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106 }
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107 }
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108
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109 if (timeout <= 0) {
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110 return FLASH_PROGRAM_ERROR;
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111 }
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112
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113 if (cache_on) {
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114 HAL_DCACHE_ENABLE();
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115 }
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116
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117 return FLASH_PROGRAM_OK;
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118 }