1 //==========================================================================
3 // flash_unlock_block.c
7 //==========================================================================
8 //####ECOSGPLCOPYRIGHTBEGIN####
9 // -------------------------------------------
10 // This file is part of eCos, the Embedded Configurable Operating System.
11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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27 // or inline functions from this file, or you compile this file and link it
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38 // -------------------------------------------
39 //####ECOSGPLCOPYRIGHTEND####
40 //==========================================================================
41 //#####DESCRIPTIONBEGIN####
44 // Contributors: gthomas
49 //####DESCRIPTIONEND####
51 //==========================================================================
55 #include <cyg/hal/hal_arch.h>
59 // The difficulty with this operation is that the hardware does not support
60 // unlocking single blocks. However, the logical layer would like this to
61 // be the case, so this routine emulates it. The hardware can clear all of
62 // the locks in the device at once. This routine will use that approach and
63 // then reset the regions which are known to be locked.
66 #define MAX_FLASH_BLOCKS 128
69 flash_unlock_block(volatile unsigned long *block, int block_size, int blocks)
70 __attribute__ ((section (".2ram.flash_unlock_block")));
72 flash_unlock_block(volatile unsigned long *block, int block_size, int blocks)
74 volatile unsigned long *ROM, *bp;
76 int timeout = 5000000;
77 unsigned char is_locked[MAX_FLASH_BLOCKS];
82 block = (volatile unsigned long *)CYGARC_UNCACHED_ADDRESS((unsigned long)block);
83 ROM = (volatile unsigned long *)((unsigned long)block & FLASH_BASE_MASK);
85 // Clear any error conditions
86 ROM[0] = FLASH_Clear_Status;
88 // Get current block lock state. This needs to access each block on
89 // the device so currently locked blocks can be re-locked.
91 for (i = 0; i < (blocks/2); i++) {
95 *bp = FLASH_Read_Query;
98 bp += block_size / sizeof(*bp);
101 // Clears all lock bits
102 block[0] = FLASH_Clear_Locks;
103 block[0] = FLASH_Clear_Locks_Confirm; // Confirmation
105 while(((stat = ROM[0]) & FLASH_Status_Ready) != FLASH_Status_Ready) {
106 if (--timeout == 0) break;
109 // Restore the lock state
111 for (i = 0; i < (blocks/2); i++) {
113 *bp = FLASH_Set_Lock;
114 *bp = FLASH_Set_Lock_Confirm; // Confirmation
116 while(((stat = ROM[0]) & FLASH_Status_Ready) != FLASH_Status_Ready) {
117 if (--timeout == 0) break;
120 bp += block_size / sizeof(*bp);
123 // Restore ROM to "normal" mode
124 ROM[0] = FLASH_Reset;
126 FLASH_WRITE_DISABLE();