//==========================================================================////      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 Red Hat, 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.,// 59 Temple Place, Suite 330, Boston, MA 02111-1307 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.//// This exception does not invalidate any other reasons why a work based on// this file might be covered by the GNU General Public License.//// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.// at http://sources.redhat.com/ecos/ecos-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>#include <cyg/hal/hal_cache.h>//// CAUTION!  This code must be copied to RAM before execution.  Therefore,// it must not contain any code which might be position dependent!//int flash_erase_block(volatile flash_t *block, unsigned int block_size){    volatile flash_t *ROM;    flash_t stat = 0;    int timeout = 50000;    int cache_on;    int len, block_len, erase_block_size;    volatile flash_t *eb;    HAL_DCACHE_IS_ENABLED(cache_on);    if (cache_on) {        HAL_DCACHE_SYNC();        HAL_DCACHE_DISABLE();    }    // 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) {// FIXME - Handle 'boot' blocks        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) {        ROM[0] = FLASH_Block_Erase;        *eb = FLASH_Confirm;        timeout = 5000000;        while(((stat = ROM[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;    }    if (cache_on) {        HAL_DCACHE_ENABLE();    }    return stat;}