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  */
  35 static 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  */
  57 static 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  */
 101 int 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