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//==========================================================================
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//
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// flash_program_buf.c
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//
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// Flash programming
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//
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//==========================================================================
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//####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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//
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// As a special exception, if other files instantiate templates or use macros
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// or inline functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
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// License. However the source code for this file must still be made available
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// in accordance with section (3) of the GNU General Public License.
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//
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// This exception does not invalidate any other reasons why a work based on
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// this file might be covered by the GNU General Public License.
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//
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// at http://sources.redhat.com/ecos/ecos-license/
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// -------------------------------------------
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//####ECOSGPLCOPYRIGHTEND####
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//==========================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): gthomas
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// Contributors: gthomas
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// Date: 2001-07-17
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// Purpose:
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// Description:
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//
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//####DESCRIPTIONEND####
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//
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//==========================================================================
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#include "flash.h"
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#include <pkgconf/hal.h>
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#include <cyg/hal/hal_arch.h>
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#include <cyg/hal/hal_cache.h>
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//
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// CAUTION! This code must be copied to RAM before execution. Therefore,
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// it must not contain any code which might be position dependent!
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//
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int
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flash_program_buf(volatile unsigned short *addr, unsigned short *data, int len)
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{
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volatile unsigned short *PAGE, *ROM;
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int timeout = 50000;
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int cache_on;
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int i, offset;
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unsigned short hold[FLASH_PAGE_SIZE/2];
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HAL_DCACHE_IS_ENABLED(cache_on);
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if (cache_on) {
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HAL_DCACHE_SYNC();
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HAL_DCACHE_DISABLE();
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}
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if (len != FLASH_PAGE_SIZE) {
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return FLASH_LENGTH_ERROR;
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}
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ROM = (volatile unsigned short *)((unsigned long)addr & 0xFFFF0000);
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PAGE = (volatile unsigned short *)((unsigned long)addr & FLASH_PAGE_MASK);
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// Copy current contents (allows for partial updates)
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for (i = 0; i < FLASH_PAGE_SIZE/2; i++) {
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hold[i] = PAGE[i];
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}
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// Merge data into holding buffer
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offset = (unsigned long)addr & FLASH_PAGE_OFFSET;
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for (i = 0; i < (len/2); i++) {
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hold[offset+i] = data[i];
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}
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// Now write the data
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// Send lead-in sequence
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ROM[FLASH_Key_Addr0] = FLASH_Key0;
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ROM[FLASH_Key_Addr1] = FLASH_Key1;
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// Send 'write' command
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ROM[FLASH_Key_Addr0] = FLASH_Program;
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// Send one page/sector of data
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for (i = 0; i < FLASH_PAGE_SIZE/2; i++) {
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PAGE[i] = hold[i];
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}
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// Wait for data to be programmed
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while (timeout-- > 0) {
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if (PAGE[(FLASH_PAGE_SIZE/2)-1] == hold[(FLASH_PAGE_SIZE/2)-1]) {
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break;
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}
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}
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if (timeout <= 0) {
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return FLASH_PROGRAM_ERROR;
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}
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if (cache_on) {
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HAL_DCACHE_ENABLE();
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}
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return FLASH_PROGRAM_OK;
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}
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