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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [devs/] [flash/] [arm/] [edb7xxx/] [v2_0/] [src/] [flash_erase_block.c] - Rev 174
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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 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 // Contributors: gthomas // Date: 2000-07-14 // Purpose: // Description: // //####DESCRIPTIONEND#### // //========================================================================== #include "flash.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 unsigned long *block) { volatile unsigned long *ROM, *sb; unsigned long stat; int timeout = 50000; int cache_on; int len, block_size; HAL_DCACHE_IS_ENABLED(cache_on); if (cache_on) { HAL_DCACHE_SYNC(); HAL_DCACHE_DISABLE(); } ROM = (volatile unsigned long *)((unsigned long)block & 0xFF800000); // Clear any error conditions ROM[0] = FLASH_Clear_Status; len = FLASH_BLOCK_SIZE; if (((unsigned long)block - (unsigned long)ROM) < FLASH_BLOCK_SIZE) { block_size = FLASH_BOOT_BLOCK_SIZE; // First 8 blocks are only 8Kx2 each } else { block_size = FLASH_BLOCK_SIZE; } sb = block; while (len > 0) { // Erase block ROM[0] = FLASH_Block_Erase; *block = FLASH_Confirm; timeout = 5000000; while(((stat = ROM[0]) & FLASH_Status_Ready) != FLASH_Status_Ready) { if (--timeout == 0) break; } len -= block_size; block += block_size / sizeof(*block); } // Restore ROM to "normal" mode ROM[0] = FLASH_Reset; // If an error was reported, see if the block erased anyway if (stat & 0x007E007E) { len = FLASH_BLOCK_SIZE; block = sb; while (len > 0) { if (*block++ != 0xFFFFFFFF) break; len -= sizeof(*block); } if (len == 0) stat = 0; } if (cache_on) { HAL_DCACHE_ENABLE(); } return stat; }