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Merge from eCos master repository on 2001-03-29-21:44:39-BST
author jlarmour
date Fri, 06 Apr 2001 17:20:13 +0000
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children e0c0827131d1
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156
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1 //==========================================================================
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2 //
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3 // flash_lock_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: 2000-12-07
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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 #include <cyg/hal/hal_arch.h>
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46
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47 //
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48 // CAUTION! This code must be copied to RAM before execution. Therefore,
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49 // it must not contain any code which might be position dependent!
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50 //
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51
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52 int
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53 flash_lock_block(volatile unsigned long *block)
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54 {
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55 volatile unsigned long *ROM;
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56 unsigned long stat;
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57 int timeout = 5000000;
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58
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59 FLASH_WRITE_ENABLE();
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60
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61 block = (volatile unsigned long *)CYGARC_UNCACHED_ADDRESS((unsigned long)block);
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62 ROM = (volatile unsigned long *)((unsigned long)block & FLASH_BASE_MASK);
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63
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64 // Clear any error conditions
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65 ROM[0] = FLASH_Clear_Status;
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66
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67 // Set lock bit
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68 block[0] = FLASH_Set_Lock;
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69 block[0] = FLASH_Set_Lock_Confirm; // Confirmation
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70 while(((stat = ROM[0]) & FLASH_Status_Ready) != FLASH_Status_Ready) {
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71 if (--timeout == 0) break;
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72 }
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73
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74 // Restore ROM to "normal" mode
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75 ROM[0] = FLASH_Reset;
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76
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77 FLASH_WRITE_DISABLE();
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78
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79 return stat;
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80 }