diff options
Diffstat (limited to 'ecos/packages/devs/flash/intel/strata/current/src/flash_erase_block.c')
| -rw-r--r-- | ecos/packages/devs/flash/intel/strata/current/src/flash_erase_block.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/ecos/packages/devs/flash/intel/strata/current/src/flash_erase_block.c b/ecos/packages/devs/flash/intel/strata/current/src/flash_erase_block.c new file mode 100644 index 0000000..c5414fc --- /dev/null +++ b/ecos/packages/devs/flash/intel/strata/current/src/flash_erase_block.c @@ -0,0 +1,115 @@ +//========================================================================== +// +// 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; +} |