Mercurial > flash_v2

annotate packages/devs/flash/arm/edb7xxx/current/src/flash_query.c @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
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children 289bf90c6a9b
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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 //==========================================================================
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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: 2000-07-26
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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 #include CYGHWR_MEMORY_LAYOUT_H
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50
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51 //
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52 // CAUTION! This code must be copied to RAM before execution. Therefore,
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53 // it must not contain any code which might be position dependent!
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54 //
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55
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56 #define CNT 200*1000*10 // Approx 20ms
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57
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58 int
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59 flash_query(unsigned short *data)
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60 {
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61 volatile unsigned long *ROM;
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62 int cnt;
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63 int cache_on;
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64
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65 HAL_DCACHE_IS_ENABLED(cache_on);
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66 if (cache_on) {
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67 HAL_DCACHE_SYNC();
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68 HAL_DCACHE_DISABLE();
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69 }
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70
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71 ROM = (volatile unsigned long *)0xE0000000;
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72
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73 ROM[0] = FLASH_Read_ID;
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74 for (cnt = CNT; cnt > 0; cnt--) ;
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75 *data++ = *ROM++; // Manufacturer code
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76 *data++ = *ROM++; // Device identifier
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77
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78 ROM[0] = FLASH_Reset;
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79
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80 if (cache_on) {
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81 HAL_DCACHE_ENABLE();
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82 }
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83
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84 return 0;
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85 }