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//==========================================================================
//
// flash_erase_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, hmt
// Contributors: gthomas
// Date: 2001-02-14
// Purpose:
// Description:
//
//####DESCRIPTIONEND####
//
//==========================================================================
#include "strata.h"
#include <pkgconf/hal.h>
#include <cyg/hal/hal_arch.h>
int flash_erase_block(volatile flash_t *block, unsigned int block_size)
__attribute__ ((section (".2ram.flash_erase_block")));
int flash_erase_block(volatile flash_t *block, unsigned int block_size)
{
volatile flash_t *ROM;
flash_t stat = 0;
int timeout = 50000;
int len, block_len, erase_block_size;
volatile flash_t *eb;
// Get base address and map addresses to virtual addresses
ROM = FLASH_P2V(CYGNUM_FLASH_BASE_MASK & (unsigned int)block);
eb = block = FLASH_P2V(block);
block_len = block_size;
#ifdef CYGOPT_FLASH_IS_BOOTBLOCK
#define BLOCKSIZE (0x10000*CYGNUM_FLASH_DEVICES)
#define ERASE_BLOCKSIZE (0x2000*CYGNUM_FLASH_DEVICES)
if ((eb - ROM) < BLOCKSIZE/(sizeof eb[0])) {
erase_block_size = ERASE_BLOCKSIZE;
} else {
erase_block_size = block_size;
}
#else
erase_block_size = block_size;
#endif
// Clear any error conditions
ROM[0] = FLASH_Clear_Status;
// Erase block
while (block_len > 0) {
eb[0] = FLASH_Block_Erase;
eb[0] = FLASH_Confirm;
timeout = 5000000;
while(((stat = eb[0]) & FLASH_Status_Ready) != FLASH_Status_Ready) {
if (--timeout == 0) break;
}
block_len -= erase_block_size;
eb = FLASH_P2V((unsigned int)eb + erase_block_size);
}
// Restore ROM to "normal" mode
ROM[0] = FLASH_Reset;
// If an error was reported, see if the block erased anyway
if (stat & FLASH_ErrorMask ) {
len = block_size;
while (len > 0) {
if (*block++ != FLASH_BlankValue ) break;
len -= sizeof(*block);
}
if (len == 0) stat = 0;
}
return stat;
}
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