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comparison packages/devs/flash/powerpc/mbx/current/src/flash_program_buf.c @ 130:eb9fd8c04db3 ecos-sw-2000-10-23

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Merge from eCos master repository on 2000-10-23-17:01:37-BST
author jlarmour
date Mon, 23 Oct 2000 17:10:57 +0000
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129:605a0fc6f385 130:eb9fd8c04db3
1 //==========================================================================
2 //
3 // flash_program_buf.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
56 flash_program_buf(volatile unsigned char *addr, unsigned char *data, int len)
57 {
58 volatile unsigned char *ROM;
59 int timeout = 50000;
60 int cache_on;
61 int erase_state, new_state;
62
63 HAL_DCACHE_IS_ENABLED(cache_on);
64 if (cache_on) {
65 HAL_DCACHE_SYNC();
66 HAL_DCACHE_DISABLE();
67 }
68
69 ROM = (volatile unsigned long *)((unsigned long)addr & 0xFF800000);
70
71 while (len > 0) {
72 // Program data [byte] - 4 step sequence
73 ROM[FLASH_Setup_Addr1] = FLASH_Setup_Code1;
74 ROM[FLASH_Setup_Addr2] = FLASH_Setup_Code2;
75 ROM[FLASH_Setup_Addr1] = FLASH_Program;
76 *addr = *data;
77 for (timeout = 50; timeout--; timeout > 0) ;
78 erase_state = *addr & FLASH_Busy;
79 while (true) {
80 new_state = *addr;
81 if ((new_state & FLASH_Busy) == erase_state) break; // "toggle" stopped
82 erase_state = new_state & FLASH_Busy;
83 if (new_state & FLASH_Err) break;
84 if (--timeout == 0) break;
85 }
86 ROM[0] = FLASH_Reset;
87 if (*addr++ != *data++) {
88 new_state = 0xFF;
89 break;
90 }
91 len -= sizeof(*data);
92 }
93 if (len == 0) new_state = 0; // Success
94
95 // Restore ROM to "normal" mode
96 bad:
97 ROM[0] = FLASH_Reset;
98
99 if (cache_on) {
100 HAL_DCACHE_ENABLE();
101 }
102 return new_state;
103 }