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//==========================================================================
//
// flash_unlock_block.c
//
// Flash programming
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later
// version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License
// along with eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): gthomas
// Contributors: gthomas
// Date: 2000-09-10
// Purpose:
// Description:
//
//####DESCRIPTIONEND####
//
//==========================================================================
#include "flash.h"
#include <cyg/hal/hal_arch.h>
//
// The difficulty with this operation is that the hardware does not support
// unlocking single blocks. However, the logical layer would like this to
// be the case, so this routine emulates it. The hardware can clear all of
// the locks in the device at once. This routine will use that approach and
// then reset the regions which are known to be locked.
//
#define MAX_FLASH_BLOCKS 128
int
flash_unlock_block(volatile unsigned long *block, int block_size, int blocks)
__attribute__ ((section (".2ram.flash_unlock_block")));
int
flash_unlock_block(volatile unsigned long *block, int block_size, int blocks)
{
volatile unsigned long *ROM, *bp;
unsigned long stat;
int timeout = 5000000;
unsigned char is_locked[MAX_FLASH_BLOCKS];
int i;
FLASH_WRITE_ENABLE();
block = (volatile unsigned long *)CYGARC_UNCACHED_ADDRESS((unsigned long)block);
ROM = (volatile unsigned long *)((unsigned long)block & FLASH_BASE_MASK);
// Clear any error conditions
ROM[0] = FLASH_Clear_Status;
// Get current block lock state. This needs to access each block on
// the device so currently locked blocks can be re-locked.
bp = ROM;
for (i = 0; i < (blocks/2); i++) {
if (bp == block) {
is_locked[i] = 0;
} else {
*bp = FLASH_Read_Query;
is_locked[i] = bp[2];
}
bp += block_size / sizeof(*bp);
}
// Clears all lock bits
block[0] = FLASH_Clear_Locks;
block[0] = FLASH_Clear_Locks_Confirm; // Confirmation
timeout = 5000000;
while(((stat = ROM[0]) & FLASH_Status_Ready) != FLASH_Status_Ready) {
if (--timeout == 0) break;
}
// Restore the lock state
bp = ROM;
for (i = 0; i < (blocks/2); i++) {
if (is_locked[i]) {
*bp = FLASH_Set_Lock;
*bp = FLASH_Set_Lock_Confirm; // Confirmation
timeout = 5000000;
while(((stat = ROM[0]) & FLASH_Status_Ready) != FLASH_Status_Ready) {
if (--timeout == 0) break;
}
}
bp += block_size / sizeof(*bp);
}
// Restore ROM to "normal" mode
ROM[0] = FLASH_Reset;
FLASH_WRITE_DISABLE();
return stat;
}
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