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[/] [openrisc/] [trunk/] [rtos/] [ecos-3.0/] [packages/] [devs/] [flash/] [arm/] [iq80310/] [current/] [src/] [flash_erase_block.c] - Blame information for rev 786

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1 786 skrzyp
//==========================================================================
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//
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//      flash_erase_block.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 Free Software Foundation, 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      
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// version.                                                                 
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT      
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// ANY 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        
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// along with eCos; if not, write to the Free Software Foundation, Inc.,    
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// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.            
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//
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// As a special exception, if other files instantiate templates or use      
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// macros or inline functions from this file, or you compile this file      
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// and link it with other works to produce a work based on this file,       
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// this file does not by itself cause the resulting work to be covered by   
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// the GNU General Public License. However the source code for this file    
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// must still be made available in accordance with section (3) of the GNU   
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// General Public License v2.                                               
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//
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// This exception does not invalidate any other reasons why a work based    
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// on this file might be covered by the GNU General Public 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, msalter
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// Date:         2000-07-14
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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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int flash_erase_block(volatile unsigned char *block)
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        __attribute__ ((section (".2ram.flash_erase_block")));
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int flash_erase_block(volatile unsigned char *block)
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{
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    volatile unsigned char *ROM;
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    unsigned short stat;
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    int timeout = 50000;
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    int len;
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    // First 4K page of flash at physcial address zero is
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    // virtually mapped to address 0xa0000000.
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    ROM = FLASH_P2V((unsigned)block & 0xFF800000);
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    // Clear any error conditions
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    ROM[0] = FLASH_Clear_Status;
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    // Erase block
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    ROM[0] = FLASH_Block_Erase;
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    *FLASH_P2V(block) = FLASH_Confirm;
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    timeout = 5000000;
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    while(((stat = ROM[0]) & FLASH_Status_Ready) != FLASH_Status_Ready) {
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        if (--timeout == 0) break;
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    }
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    // Restore ROM to "normal" mode
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    ROM[0] = FLASH_Reset;
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    // If an error was reported, see if the block erased anyway
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    if (stat & 0x7E) {
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        len = FLASH_BLOCK_SIZE;
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        while (len > 0) {
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            if (*FLASH_P2V(block) != 0xFF)
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                break;
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            block++;
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            len -= sizeof(*block);
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        }
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        if (len == 0) stat = 0;
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    }
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    return stat;
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}

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