/*------------------------------------------------------------------------------------------*\
 *   
 *   Copyright (C) 2014 AVM GmbH <fritzbox_info@avm.de>
 *
 *   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
\*------------------------------------------------------------------------------------------*/

/*------------------------------------------------------------------------------------------*\
 * Quick'n'dirty hack to access SPI flash for TFFS in panic mode
\*------------------------------------------------------------------------------------------*/

#include <linux/module.h>
#include <linux/version.h>
#include <linux/slab.h>
#include <asm/fcntl.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/io.h>
#include <linux/mtd/mtd.h>

#define FLASH_SUCCESS           0
#define FLASH_INVAL_ADDR        0x8002
#define FLASH_ID_FAILED         0x8003
#define FLASH_QUERY_FAILED      0x8004
#define FLASH_ERASE_REGIONS     0x8005
#define FLASH_MX_BOTTOM_FAILED  0x8006

extern int vx185_snor_panic_reinit(void);
extern struct mtd_info *fusiv_tffs_mtd[2];

static unsigned int init_done = 0;

int tffs_spi_read(unsigned int address, unsigned int mtd_id, unsigned char *pdata, unsigned int len)
{
    struct mtd_info *mtd;
    size_t retlen;
    int result;

    mtd = fusiv_tffs_mtd[mtd_id];
    retlen = 0;

    result = mtd->read(mtd, address, len, &retlen, pdata);

    return retlen;
}

/*------------------------------------------------------------------------------------------*\
\*------------------------------------------------------------------------------------------*/
int tffs_spi_write(unsigned int address, unsigned int mtd_id, unsigned char *pdata, unsigned int len)
{
    struct mtd_info *mtd;
    size_t retlen;
    int result;

    mtd = fusiv_tffs_mtd[mtd_id];
    retlen = 0;

    result = mtd->write(mtd, address, len, &retlen, pdata);

    return retlen;
}

int tffs_spi_init(void)
{
    int result = 0;
    
    if(!init_done){
        if(fusiv_tffs_mtd[0] == NULL || fusiv_tffs_mtd[1] == NULL){
            result = -ENODEV;
        } else {
            result = vx185_snor_panic_reinit();
        }
    }

    return result;
}