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annotate packages/devs/flash/powerpc/viper/current/src/flash_program_buf.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 511f4dc167f6
children d2c90368aeef
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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 //==========================================================================
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####
159
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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: 2000-07-14
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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
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59 //
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60 // CAUTION! This code must be copied to RAM before execution. Therefore,
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61 // it must not contain any code which might be position dependent!
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62 //
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63
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64 int
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65 flash_program_buf(volatile unsigned char *addr, unsigned char *data, int len)
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66 {
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67 volatile unsigned char *ROM;
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68 int timeout = 50000;
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69 int cache_on;
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70 int erase_state, new_state;
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71
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72 HAL_DCACHE_IS_ENABLED(cache_on);
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73 if (cache_on) {
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74 HAL_DCACHE_SYNC();
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75 HAL_DCACHE_DISABLE();
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76 }
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77
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78 ROM = (volatile unsigned long *)((unsigned long)addr & 0xFF800000);
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79
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80 while (len > 0) {
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81 // Program data [byte] - 4 step sequence
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82 ROM[FLASH_Setup_Addr1] = FLASH_Setup_Code1;
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83 ROM[FLASH_Setup_Addr2] = FLASH_Setup_Code2;
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84 ROM[FLASH_Setup_Addr1] = FLASH_Program;
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85 *addr = *data;
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86 for (timeout = 50; timeout--; timeout > 0) ;
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87 erase_state = *addr & FLASH_Busy;
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88 while (true) {
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89 new_state = *addr;
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90 if ((new_state & FLASH_Busy) == erase_state) break; // "toggle" stopped
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91 erase_state = new_state & FLASH_Busy;
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92 if (new_state & FLASH_Err) break;
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93 if (--timeout == 0) break;
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94 }
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95 ROM[0] = FLASH_Reset;
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96 if (*addr++ != *data++) {
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97 new_state = 0xFF;
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98 break;
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99 }
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100 len -= sizeof(*data);
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101 }
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102 if (len == 0) new_state = 0; // Success
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103
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104 // Restore ROM to "normal" mode
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105 bad:
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106 ROM[0] = FLASH_Reset;
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107
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108 if (cache_on) {
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109 HAL_DCACHE_ENABLE();
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110 }
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111 return new_state;
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112 }