/*
 * (C) Copyright 2006 Aubrey.Li, aubrey.li@analog.com
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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
 */

#include <common.h>
#include <asm/io.h>
#include <linux/mtd/ndfc.h>

#if defined(CONFIG_CMD_NAND)

#include <nand.h>


/*
 * hardware specific access to control-lines
 */
static u8 hwctl=0;

static void my_hwcontrol(struct mtd_info *mtd, int cmd)
{
	register struct nand_chip *this = mtd->priv;

	switch (cmd) {
	case NAND_CTL_SETCLE:
        hwctl |= my_NAND_CLE;
		break;
	case NAND_CTL_CLRCLE:
       hwctl &= ~my_NAND_CLE;
		break;

	case NAND_CTL_SETALE:
       hwctl |= my_NAND_ALE;

		break;
	case NAND_CTL_CLRALE:
        hwctl &= ~my_NAND_ALE;
		break;
	case NAND_CTL_SETNCE:
	case NAND_CTL_CLRNCE:
		break;
	}

}

static void my_write_byte(struct mtd_info *mtdinfo, u_char byte)
{

    if (hwctl & my_NAND_CLE) {
      out_8((u8 *)(CFG_NAND_BASE + my_NAND_CLE), byte);
	}else if (hwctl & my_NAND_ALE) {
        out_8((u8 *)(CFG_NAND_BASE + my_NAND_ALE), byte);
    } 
}

static u_char my_read_byte(struct mtd_info *mtdinfo)
{

	return in_8((u8 *)(CFG_NAND_BASE));

}

int my_device_ready(struct mtd_info *mtd)
{
    ulong rb_gpio_pin;
	if (in32(GPIO0_IR) & CFG_NAND_RDY)
        return 1;
    return 0;

}
/*
 * Speedups for buffer read/write/verify
 *
 * NDFC allows 32bit read/write of data. So we can speed up the buffer
 * functions. No further checking, as nand_base will always read/write
 * page aligned.
 */
static void my_read_buf(struct mtd_info *mtdinfo, uint8_t *buf, int len)
{
//    struct nand_chip *this = mtdinfo->priv;
//    ulong base = (ulong) this->IO_ADDR_W & 0xfffffffc;
    uint32_t *p = (uint32_t *) buf;

    for (;len > 0; len -= 4)
        *p++ = in_be32((u32 *)(CFG_NAND_BASE));
}

/*
 * Board-specific NAND initialization. The following members of the
 * argument are board-specific (per include/linux/mtd/nand.h):
 * - IO_ADDR_R?: address to read the 8 I/O lines of the flash device
 * - IO_ADDR_W?: address to write the 8 I/O lines of the flash device
 * - hwcontrol: hardwarespecific function for accesing control-lines
 * - dev_ready: hardwarespecific function for  accesing device ready/busy line
 * - enable_hwecc?: function to enable (reset)  hardware ecc generator. Must
 *   only be provided if a hardware ECC is available
 * - eccmode: mode of ecc, see defines
 * - chip_delay: chip dependent delay for transfering data from array to
 *   read regs (tR)
 * - options: various chip options. They can partly be set to inform
 *   nand_scan about special functionality. See the defines for further
 *   explanation
 * Members with a "?" were not set in the merged testing-NAND branch,
 * so they are not set here either.
 */
int board_nand_init(struct nand_chip *nand)
{
    out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) | CFG_NAND_CE);

	nand->hwcontrol = my_hwcontrol;
	nand->eccmode = NAND_ECC_SOFT;
	nand->dev_ready = my_device_ready;
	nand->chip_delay = 30;

	nand->write_byte = my_write_byte;
	nand->read_buf   = my_read_buf;
    nand->read_byte  = my_read_byte;

	return 0;
}
#endif