LXR uboot/board/sc3/sc3nand.c

   1/*
   2 * (C) Copyright 2007
   3 * Heiko Schocher, DENX Software Engineering, hs@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
  26#if defined(CONFIG_CMD_NAND)
  27
  28#include <nand.h>
  29#include <asm/processor.h>
  30
  31#define readb(addr)     *(volatile u_char *)(addr)
  32#define readl(addr)     *(volatile u_long *)(addr)
  33#define writeb(d,addr)  *(volatile u_char *)(addr) = (d)
  34
  35#define SC3_NAND_ALE 29 /* GPIO PIN 3 */
  36#define SC3_NAND_CLE 30 /* GPIO PIN 2 */
  37#define SC3_NAND_CE  27 /* GPIO PIN 5 */
  38
  39static void *sc3_io_base;
  40static void *sc3_control_base = (void *)0xEF600700;
  41
  42static void sc3_nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  43{
  44        struct nand_chip *this = mtd->priv;
  45        if (ctrl & NAND_CTRL_CHANGE) {
  46                if ( ctrl & NAND_CLE )
  47                        set_bit (SC3_NAND_CLE, sc3_control_base);
  48                else
  49                        clear_bit (SC3_NAND_CLE, sc3_control_base);
  50                if ( ctrl & NAND_ALE )
  51                        set_bit (SC3_NAND_ALE, sc3_control_base);
  52                else
  53                        clear_bit (SC3_NAND_ALE, sc3_control_base);
  54                if ( ctrl & NAND_NCE )
  55                        set_bit (SC3_NAND_CE, sc3_control_base);
  56                else
  57                        clear_bit (SC3_NAND_CE, sc3_control_base);
  58        }
  59
  60        if (cmd != NAND_CMD_NONE)
  61                writeb(cmd, this->IO_ADDR_W);
  62}
  63
  64static int sc3_nand_dev_ready(struct mtd_info *mtd)
  65{
  66        if (!(readl(sc3_control_base + 0x1C) & 0x4000))
  67                return 0;
  68        return 1;
  69}
  70
  71static void sc3_select_chip(struct mtd_info *mtd, int chip)
  72{
  73        clear_bit (SC3_NAND_CE, sc3_control_base);
  74}
  75
  76int board_nand_init(struct nand_chip *nand)
  77{
  78        nand->ecc.mode = NAND_ECC_SOFT;
  79
  80        sc3_io_base = (void *) CONFIG_SYS_NAND_BASE;
  81        /* Set address of NAND IO lines (Using Linear Data Access Region) */
  82        nand->IO_ADDR_R = (void __iomem *) sc3_io_base;
  83        nand->IO_ADDR_W = (void __iomem *) sc3_io_base;
  84        /* Reference hardware control function */
  85        nand->cmd_ctrl  = sc3_nand_hwcontrol;
  86        nand->dev_ready  = sc3_nand_dev_ready;
  87        nand->select_chip = sc3_select_chip;
  88        return 0;
  89}
  90#endif
  91