LXR uboot/board/quad100hd/nand.c

   1/*
   2 * (C) Copyright 2008
   3 * Gary Jennejohn, DENX Software Engineering GmbH, garyj@denx.de
   4 *
   5 * See file CREDITS for list of people who contributed to this
   6 * project.
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License as
  10 * published by the Free Software Foundation; either version 2 of
  11 * the License, or (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21 * MA 02111-1307 USA
  22 */
  23
  24#include <common.h>
  25#include <config.h>
  26#if defined(CONFIG_CMD_NAND)
  27#include <asm/gpio.h>
  28#include <asm/io.h>
  29#include <nand.h>
  30
  31/*
  32 *      hardware specific access to control-lines
  33 */
  34static void quad100hd_hwcontrol(struct mtd_info *mtd,
  35                                int cmd, unsigned int ctrl)
  36{
  37        struct nand_chip *this = mtd->priv;
  38
  39        if (ctrl & NAND_CTRL_CHANGE) {
  40                gpio_write_bit(CONFIG_SYS_NAND_CLE, !!(ctrl & NAND_CLE));
  41                gpio_write_bit(CONFIG_SYS_NAND_ALE, !!(ctrl & NAND_ALE));
  42                gpio_write_bit(CONFIG_SYS_NAND_CE, !(ctrl & NAND_NCE));
  43        }
  44
  45        if (cmd != NAND_CMD_NONE)
  46                writeb(cmd, this->IO_ADDR_W);
  47}
  48
  49static int quad100hd_nand_ready(struct mtd_info *mtd)
  50{
  51        return gpio_read_in_bit(CONFIG_SYS_NAND_RDY);
  52}
  53
  54/*
  55 * Main initialization routine
  56 */
  57int board_nand_init(struct nand_chip *nand)
  58{
  59        /* Set address of hardware control function */
  60        nand->cmd_ctrl = quad100hd_hwcontrol;
  61        nand->dev_ready = quad100hd_nand_ready;
  62        nand->ecc.mode = NAND_ECC_SOFT;
  63        /* 15 us command delay time */
  64        nand->chip_delay =  20;
  65
  66        /* Return happy */
  67        return 0;
  68}
  69#endif /* CONFIG_CMD_NAND */
  70