//==========================================================================
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//==========================================================================
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//
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//
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// flash_unlock_block.c
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// flash_unlock_block.c
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//
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//
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// Flash programming
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// Flash programming
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//
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//
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//==========================================================================
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//==========================================================================
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//####ECOSGPLCOPYRIGHTBEGIN####
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//####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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//
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later version.
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// Software Foundation; either version 2 or (at your option) any later version.
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//
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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// for more details.
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//
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//
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// You should have received a copy of the GNU General Public License along
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// You should have received a copy of the GNU General Public License along
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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//
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//
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// As a special exception, if other files instantiate templates or use macros
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// As a special exception, if other files instantiate templates or use macros
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// or inline functions from this file, or you compile this file and link it
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// or inline functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
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// by itself cause the resulting work to be covered by the GNU General Public
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// License. However the source code for this file must still be made available
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// License. However the source code for this file must still be made available
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// in accordance with section (3) of the GNU General Public License.
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// in accordance with section (3) of the GNU General Public License.
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//
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//
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// This exception does not invalidate any other reasons why a work based on
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// This exception does not invalidate any other reasons why a work based on
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// this file might be covered by the GNU General Public License.
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// this file might be covered by the GNU General Public License.
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//
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//
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// at http://sources.redhat.com/ecos/ecos-license/
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// at http://sources.redhat.com/ecos/ecos-license/
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// -------------------------------------------
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// -------------------------------------------
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//####ECOSGPLCOPYRIGHTEND####
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//####ECOSGPLCOPYRIGHTEND####
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//==========================================================================
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//==========================================================================
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//#####DESCRIPTIONBEGIN####
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//#####DESCRIPTIONBEGIN####
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//
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//
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// Author(s): gthomas
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// Author(s): gthomas
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// Contributors: gthomas
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// Contributors: gthomas
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// Date: 2000-09-10
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// Date: 2000-09-10
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// Purpose:
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// Purpose:
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// Description:
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// Description:
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//
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//
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//####DESCRIPTIONEND####
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//####DESCRIPTIONEND####
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//
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//
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//==========================================================================
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//==========================================================================
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#include "flash.h"
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#include "flash.h"
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#include <cyg/hal/hal_arch.h>
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#include <cyg/hal/hal_arch.h>
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//
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//
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// CAUTION! This code must be copied to RAM before execution. Therefore,
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// CAUTION! This code must be copied to RAM before execution. Therefore,
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// it must not contain any code which might be position dependent!
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// it must not contain any code which might be position dependent!
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//
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//
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//
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//
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// The difficulty with this operation is that the hardware does not support
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// The difficulty with this operation is that the hardware does not support
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// unlocking single blocks. However, the logical layer would like this to
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// unlocking single blocks. However, the logical layer would like this to
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// be the case, so this routine emulates it. The hardware can clear all of
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// be the case, so this routine emulates it. The hardware can clear all of
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// the locks in the device at once. This routine will use that approach and
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// the locks in the device at once. This routine will use that approach and
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// then reset the regions which are known to be locked.
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// then reset the regions which are known to be locked.
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//
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//
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#define MAX_FLASH_BLOCKS 128
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#define MAX_FLASH_BLOCKS 128
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int
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int
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flash_unlock_block(volatile unsigned long *block, int block_size, int blocks)
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flash_unlock_block(volatile unsigned long *block, int block_size, int blocks)
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{
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{
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volatile unsigned long *ROM, *bp;
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volatile unsigned long *ROM, *bp;
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unsigned long stat;
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unsigned long stat;
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int timeout = 5000000;
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int timeout = 5000000;
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unsigned char is_locked[MAX_FLASH_BLOCKS];
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unsigned char is_locked[MAX_FLASH_BLOCKS];
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int i;
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int i;
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FLASH_WRITE_ENABLE();
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FLASH_WRITE_ENABLE();
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block = (volatile unsigned long *)CYGARC_UNCACHED_ADDRESS((unsigned long)block);
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block = (volatile unsigned long *)CYGARC_UNCACHED_ADDRESS((unsigned long)block);
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ROM = (volatile unsigned long *)((unsigned long)block & FLASH_BASE_MASK);
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ROM = (volatile unsigned long *)((unsigned long)block & FLASH_BASE_MASK);
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// Clear any error conditions
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// Clear any error conditions
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ROM[0] = FLASH_Clear_Status;
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ROM[0] = FLASH_Clear_Status;
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// Get current block lock state. This needs to access each block on
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// Get current block lock state. This needs to access each block on
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// the device so currently locked blocks can be re-locked.
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// the device so currently locked blocks can be re-locked.
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bp = ROM;
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bp = ROM;
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for (i = 0; i < (blocks/2); i++) {
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for (i = 0; i < (blocks/2); i++) {
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if (bp == block) {
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if (bp == block) {
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is_locked[i] = 0;
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is_locked[i] = 0;
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} else {
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} else {
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*bp = FLASH_Read_Query;
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*bp = FLASH_Read_Query;
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is_locked[i] = bp[2];
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is_locked[i] = bp[2];
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}
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}
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bp += block_size / sizeof(*bp);
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bp += block_size / sizeof(*bp);
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}
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}
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// Clears all lock bits
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// Clears all lock bits
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block[0] = FLASH_Clear_Locks;
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block[0] = FLASH_Clear_Locks;
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block[0] = FLASH_Clear_Locks_Confirm; // Confirmation
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block[0] = FLASH_Clear_Locks_Confirm; // Confirmation
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timeout = 5000000;
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timeout = 5000000;
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while(((stat = ROM[0]) & FLASH_Status_Ready) != FLASH_Status_Ready) {
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while(((stat = ROM[0]) & FLASH_Status_Ready) != FLASH_Status_Ready) {
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if (--timeout == 0) break;
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if (--timeout == 0) break;
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}
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}
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// Restore the lock state
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// Restore the lock state
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bp = ROM;
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bp = ROM;
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for (i = 0; i < (blocks/2); i++) {
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for (i = 0; i < (blocks/2); i++) {
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if (is_locked[i]) {
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if (is_locked[i]) {
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*bp = FLASH_Set_Lock;
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*bp = FLASH_Set_Lock;
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*bp = FLASH_Set_Lock_Confirm; // Confirmation
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*bp = FLASH_Set_Lock_Confirm; // Confirmation
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timeout = 5000000;
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timeout = 5000000;
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while(((stat = ROM[0]) & FLASH_Status_Ready) != FLASH_Status_Ready) {
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while(((stat = ROM[0]) & FLASH_Status_Ready) != FLASH_Status_Ready) {
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if (--timeout == 0) break;
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if (--timeout == 0) break;
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}
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}
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}
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}
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bp += block_size / sizeof(*bp);
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bp += block_size / sizeof(*bp);
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}
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}
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// Restore ROM to "normal" mode
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// Restore ROM to "normal" mode
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ROM[0] = FLASH_Reset;
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ROM[0] = FLASH_Reset;
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FLASH_WRITE_DISABLE();
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FLASH_WRITE_DISABLE();
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return stat;
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return stat;
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}
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}
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