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comparison packages/devs/flash/intel/bootblock/current/src/flash_erase_block.c @ 136:a9ac27ec7abc ecos-sw-2000-11-17

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Merge from eCos master repository on 2000-11-17-18:24:25-GMT
author jlarmour
date Fri, 17 Nov 2000 23:16:43 +0000
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children e0c0827131d1
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135:3bc2abeae9ff 136:a9ac27ec7abc
1 //==========================================================================
2 //
3 // flash_erase_block.c
4 //
5 // Flash programming
6 //
7 //==========================================================================
8 //####COPYRIGHTBEGIN####
9 //
10 // -------------------------------------------
11 // The contents of this file are subject to the Red Hat eCos Public License
12 // Version 1.1 (the "License"); you may not use this file except in
13 // compliance with the License. You may obtain a copy of the License at
14 // http://www.redhat.com/
15 //
16 // Software distributed under the License is distributed on an "AS IS"
17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
18 // License for the specific language governing rights and limitations under
19 // the License.
20 //
21 // The Original Code is eCos - Embedded Configurable Operating System,
22 // released September 30, 1998.
23 //
24 // The Initial Developer of the Original Code is Red Hat.
25 // Portions created by Red Hat are
26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
27 // All Rights Reserved.
28 // -------------------------------------------
29 //
30 //####COPYRIGHTEND####
31 //==========================================================================
32 //#####DESCRIPTIONBEGIN####
33 //
34 // Author(s): gthomas
35 // Contributors: gthomas
36 // Date: 2000-07-14
37 // Purpose:
38 // Description:
39 //
40 //####DESCRIPTIONEND####
41 //
42 //==========================================================================
43
44 #include "flash.h"
45
46 #include <pkgconf/hal.h>
47 #include <cyg/hal/hal_arch.h>
48 #include <cyg/hal/hal_cache.h>
49
50 //
51 // CAUTION! This code must be copied to RAM before execution. Therefore,
52 // it must not contain any code which might be position dependent!
53 //
54
55 int flash_erase_block(volatile unsigned short *block)
56 {
57 volatile unsigned short *ROM, *sb;
58 unsigned long stat;
59 int timeout = 50000;
60 int len, block_size;
61
62 GO_SLOW
63
64 ROM = (volatile unsigned short *)((unsigned long)block & 0xFF800000);
65
66 // Clear any error conditions
67 ROM[0] = FLASH_Clear_Status;
68
69 len = FLASH_BLOCK_SIZE;
70 if (((unsigned long)block - (unsigned long)ROM) < FLASH_BLOCK_SIZE) {
71 block_size = FLASH_BOOT_BLOCK_SIZE; // First 8 blocks are only 8Kx2 each
72 } else {
73 block_size = FLASH_BLOCK_SIZE;
74 }
75 sb = block;
76 while (len > 0) {
77 // Erase block
78 ROM[0] = FLASH_Block_Erase;
79 *block = FLASH_Confirm;
80 timeout = 5000000;
81 while(((stat = ROM[0]) & FLASH_Status_Ready) != FLASH_Status_Ready) {
82 if (--timeout == 0) break;
83 }
84
85 len -= block_size;
86 block += block_size / sizeof(*block);
87 }
88
89 // Restore ROM to "normal" mode
90 ROM[0] = FLASH_Reset;
91
92 // If an error was reported, see if the block erased anyway
93 if (stat & 0x007E007E) {
94 len = FLASH_BLOCK_SIZE;
95 block = sb;
96 while (len > 0) {
97 if (*block++ != 0xFFFFFFFF) break;
98 len -= sizeof(*block);
99 }
100 if (len == 0) stat = 0;
101 }
102
103 GO_FAST
104
105 return stat;
106 }