source: trunk/sst49lfxxxc.c @ 1474

/*
 * This file is part of the flashrom project.
 *
 * Copyright (C) 2000 Silicon Integrated System Corporation
 * Copyright (C) 2005-2007 coresystems GmbH
 * Copyright (C) 2009 Sean Nelson <audiohacked@gmail.com>
 *
 * This program 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 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include "flash.h"
#include "chipdrivers.h"

static int write_lockbits_block_49lfxxxc(struct flashctx *flash,
                                         unsigned long address,
                                         unsigned char bits)
{
        unsigned long lock = flash->virtual_registers + address + 2;
        msg_cdbg("lockbits at address=0x%08lx is 0x%01x\n", lock,
                 chip_readb(flash, lock));
        chip_writeb(flash, bits, lock);

        return 0;
}

static int write_lockbits_49lfxxxc(struct flashctx *flash, unsigned char bits)
{
        chipaddr registers = flash->virtual_registers;
        unsigned int i, left = flash->total_size * 1024;
        unsigned long address;

        msg_cdbg("\nbios=0x%08lx\n", registers);
        for (i = 0; left > 65536; i++, left -= 65536) {
                write_lockbits_block_49lfxxxc(flash, i * 65536, bits);
        }
        address = i * 65536;
        write_lockbits_block_49lfxxxc(flash, address, bits);
        address += 32768;
        write_lockbits_block_49lfxxxc(flash, address, bits);
        address += 8192;
        write_lockbits_block_49lfxxxc(flash, address, bits);
        address += 8192;
        write_lockbits_block_49lfxxxc(flash, address, bits);

        return 0;
}

int unlock_49lfxxxc(struct flashctx *flash)
{
        return write_lockbits_49lfxxxc(flash, 0);
}

int erase_sector_49lfxxxc(struct flashctx *flash, unsigned int address,
                          unsigned int sector_size)
{
        uint8_t status;
        chipaddr bios = flash->virtual_memory;

        chip_writeb(flash, 0x30, bios);
        chip_writeb(flash, 0xD0, bios + address);

        status = wait_82802ab(flash);
        print_status_82802ab(status);

        /* FIXME: Check the status register for errors. */
        return 0;
}