source: trunk/stm50flw0x0x.c

/*
 * This file is part of the flashrom project.
 *
 * Copyright (C) 2008 Claus Gindhart <claus.gindhart@kontron.com>
 * 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
 */

/*
 * This module is designed for supporting the devices
 * ST M50FLW040A (not yet tested)
 * ST M50FLW040B (not yet tested)
 * ST M50FLW080A
 * ST M50FLW080B (not yet tested)
 */

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

/*
 * claus.gindhart@kontron.com
 * The ST M50FLW080B and STM50FLW080B chips have to be unlocked,
 * before you can erase them or write to them.
 */
static int unlock_block_stm50flw0x0x(struct flashctx *flash, int offset)
{
        chipaddr wrprotect = flash->virtual_registers + 2;
        static const uint8_t unlock_sector = 0x00;
        int j;

        /*
         * These chips have to be unlocked before you can erase them or write
         * to them. The size of the locking sectors depends on the type
         * of chip.
         *
         * Sometimes, the BIOS does this for you; so you probably
         * don't need to worry about that.
         */

        /* Check, if it's is a top/bottom-block with 4k-sectors. */
        /* TODO: What about the other types? */
        if ((offset == 0) ||
            (offset == (flash->chip->model_id == ST_M50FLW080A ? 0xE0000 : 0x10000))
            || (offset == 0xF0000)) {

                // unlock each 4k-sector
                for (j = 0; j < 0x10000; j += 0x1000) {
                        msg_cdbg("unlocking at 0x%x\n", offset + j);
                        chip_writeb(flash, unlock_sector,
                                    wrprotect + offset + j);
                        if (chip_readb(flash, wrprotect + offset + j) !=
                            unlock_sector) {
                                msg_cerr("Cannot unlock sector @ 0x%x\n",
                                       offset + j);
                                return -1;
                        }
                }
        } else {
                msg_cdbg("unlocking at 0x%x\n", offset);
                chip_writeb(flash, unlock_sector, wrprotect + offset);
                if (chip_readb(flash, wrprotect + offset) != unlock_sector) {
                        msg_cerr("Cannot unlock sector @ 0x%x\n", offset);
                        return -1;
                }
        }

        return 0;
}

int unlock_stm50flw0x0x(struct flashctx *flash)
{
        int i;

        for (i = 0; i < flash->chip->total_size * 1024; i+= flash->chip->page_size) {
                if(unlock_block_stm50flw0x0x(flash, i)) {
                        msg_cerr("UNLOCK FAILED!\n");
                        return -1;
                }
        }

        return 0;
}

/* This function is unused. */
int erase_sector_stm50flw0x0x(struct flashctx *flash, unsigned int sector,
                              unsigned int sectorsize)
{
        chipaddr bios = flash->virtual_memory + sector;

        // clear status register
        chip_writeb(flash, 0x50, bios);
        // now start it
        chip_writeb(flash, 0x32, bios);
        chip_writeb(flash, 0xd0, bios);
        programmer_delay(10);

        wait_82802ab(flash);

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