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annotate packages/devs/flash/arm/at91/current/src/flash_query.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 e7780801e1a7
children d2c90368aeef
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1 //==========================================================================
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2 //
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3 // flash_query.c
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4 //
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5 // Flash programming - query device
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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####
175
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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
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45 // Date: 2001-07-17
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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 #include CYGHWR_MEMORY_LAYOUT_H
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59
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60 //
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61 // CAUTION! This code must be copied to RAM before execution. Therefore,
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62 // it must not contain any code which might be position dependent!
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63 //
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64
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65 #define CNT 2000*1000*10 // At least 20ms
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66
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67 int
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68 flash_query(unsigned short *data)
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69 {
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70 volatile unsigned short *ROM;
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71 int cnt, cache_on;
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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 ROM = (volatile unsigned short *)0x01010000;
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80
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81 // Send lead-in sequence
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82 ROM[FLASH_Key_Addr0] = FLASH_Key0;
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83 ROM[FLASH_Key_Addr1] = FLASH_Key1;
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84
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85 // Send 'identify' command
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86 ROM[FLASH_Key_Addr0] = FLASH_Read_ID;
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87
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88 // Need a delay of 20ms!
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89 for (cnt = 0; cnt < 50000; cnt++) ;
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90
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91 data[0] = ROM[0]; // Manufacturer code
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92 data[1] = ROM[1]; // Device identifier
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93
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94 // Send lead-in sequence
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95 ROM[FLASH_Key_Addr0] = FLASH_Key0;
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96 ROM[FLASH_Key_Addr1] = FLASH_Key1;
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97
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98 // Send 'reset' command
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99 ROM[FLASH_Key_Addr0] = FLASH_Reset;
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100
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101 // Need a delay of 20ms!
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102 for (cnt = 0; cnt < 50000; cnt++) ;
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103
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104 if (cache_on) {
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105 HAL_DCACHE_ENABLE();
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106 }
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107
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108 return 0;
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109 }