LXR uboot/board/nc650/nand.c

   1/*
   2 * (C) Copyright 2006 Detlev Zundel, dzu@denx.de
   3 * (C) Copyright 2006 DENX Software Engineering
   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 <asm/io.h>
  26
  27#if defined(CONFIG_CMD_NAND)
  28
  29#include <nand.h>
  30
  31#if defined(CONFIG_IDS852_REV1)
  32/*
  33 *      hardware specific access to control-lines
  34 */
  35static void nc650_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  36{
  37        struct nand_chip *this = mtd->priv;
  38
  39        if (ctrl & NAND_CTRL_CHANGE) {
  40                if ( ctrl & NAND_CLE )
  41                        this->IO_ADDR_W += 2;
  42                else
  43                        this->IO_ADDR_W -= 2;
  44                if ( ctrl & NAND_ALE )
  45                        this->IO_ADDR_W += 1;
  46                else
  47                        this->IO_ADDR_W -= 1;
  48        }
  49
  50        if (cmd != NAND_CMD_NONE)
  51                writeb(cmd, this->IO_ADDR_W);
  52}
  53#elif defined(CONFIG_IDS852_REV2)
  54/*
  55 *      hardware specific access to control-lines
  56 */
  57static void nc650_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  58{
  59        struct nand_chip *this = mtd->priv;
  60
  61        if (ctrl & NAND_CTRL_CHANGE) {
  62                if ( ctrl & NAND_CLE )
  63                        writeb(0, (volatile __u8 *) this->IO_ADDR_W + 0xa);
  64                else
  65                        writeb(0, (volatile __u8 *) this->IO_ADDR_W) + 0x8);
  66                if ( ctrl & NAND_ALE )
  67                        writeb(0, (volatile __u8 *) this->IO_ADDR_W) + 0x9);
  68                else
  69                        writeb(0, (volatile __u8 *) this->IO_ADDR_W) + 0x8);
  70                if ( ctrl & NAND_NCE )
  71                        writeb(0, (volatile __u8 *) this->IO_ADDR_W) + 0x8);
  72                else
  73                        writeb(0, (volatile __u8 *) this->IO_ADDR_W) + 0xc);
  74        }
  75
  76        if (cmd != NAND_CMD_NONE)
  77                writeb(cmd, this->IO_ADDR_W);
  78}
  79#else
  80#error Unknown IDS852 module revision
  81#endif
  82
  83/*
  84 * Board-specific NAND initialization. The following members of the
  85 * argument are board-specific (per include/linux/mtd/nand.h):
  86 * - IO_ADDR_R?: address to read the 8 I/O lines of the flash device
  87 * - IO_ADDR_W?: address to write the 8 I/O lines of the flash device
  88 * - cmd_ctrl: hardwarespecific function for accesing control-lines
  89 * - dev_ready: hardwarespecific function for  accesing device ready/busy line
  90 * - enable_hwecc?: function to enable (reset)  hardware ecc generator. Must
  91 *   only be provided if a hardware ECC is available
  92 * - eccm.ode: mode of ecc, see defines
  93 * - chip_delay: chip dependent delay for transfering data from array to
  94 *   read regs (tR)
  95 * - options: various chip options. They can partly be set to inform
  96 *   nand_scan about special functionality. See the defines for further
  97 *   explanation
  98 * Members with a "?" were not set in the merged testing-NAND branch,
  99 * so they are not set here either.
 100 */
 101int board_nand_init(struct nand_chip *nand)
 102{
 103
 104        nand->cmd_ctrl = nc650_hwcontrol;
 105        nand->ecc.mode = NAND_ECC_SOFT;
 106        nand->chip_delay = 12;
 107/*      nand->options = NAND_SAMSUNG_LP_OPTIONS;*/
 108        return 0;
 109}
 110#endif
 111