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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [devs/] [flash/] [arm/] [at91/] [v2_0/] [src/] [flash_program_buf.c] - Rev 174
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//========================================================================== // // flash_program_buf.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: 2001-07-17 // 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_program_buf(volatile unsigned short *addr, unsigned short *data, int len) { volatile unsigned short *PAGE, *ROM; int timeout = 50000; int cache_on; int i, offset; unsigned short hold[FLASH_PAGE_SIZE/2]; HAL_DCACHE_IS_ENABLED(cache_on); if (cache_on) { HAL_DCACHE_SYNC(); HAL_DCACHE_DISABLE(); } if (len != FLASH_PAGE_SIZE) { return FLASH_LENGTH_ERROR; } ROM = (volatile unsigned short *)((unsigned long)addr & 0xFFFF0000); PAGE = (volatile unsigned short *)((unsigned long)addr & FLASH_PAGE_MASK); // Copy current contents (allows for partial updates) for (i = 0; i < FLASH_PAGE_SIZE/2; i++) { hold[i] = PAGE[i]; } // Merge data into holding buffer offset = (unsigned long)addr & FLASH_PAGE_OFFSET; for (i = 0; i < (len/2); i++) { hold[offset+i] = data[i]; } // Now write the data // Send lead-in sequence ROM[FLASH_Key_Addr0] = FLASH_Key0; ROM[FLASH_Key_Addr1] = FLASH_Key1; // Send 'write' command ROM[FLASH_Key_Addr0] = FLASH_Program; // Send one page/sector of data for (i = 0; i < FLASH_PAGE_SIZE/2; i++) { PAGE[i] = hold[i]; } // Wait for data to be programmed while (timeout-- > 0) { if (PAGE[(FLASH_PAGE_SIZE/2)-1] == hold[(FLASH_PAGE_SIZE/2)-1]) { break; } } if (timeout <= 0) { return FLASH_PROGRAM_ERROR; } if (cache_on) { HAL_DCACHE_ENABLE(); } return FLASH_PROGRAM_OK; }