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  */
  34 static 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
  49 static 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  */
  57 int 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 */