board/freescale/m5373evb/nand.c

   1 /*
   2  * (C) Copyright 2000-2003
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
   6  * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <config.h>
  28 #include <common.h>
  29 #include <asm/io.h>
  30 #include <asm/immap.h>
  31
  32 DECLARE_GLOBAL_DATA_PTR;
  33
  34 #if defined(CONFIG_CMD_NAND)
  35 #include <nand.h>
  36 #include <linux/mtd/mtd.h>
  37
  38 #define SET_CLE         0x10
  39 #define SET_ALE         0x08
  40
  41 static void nand_hwcontrol(struct mtd_info *mtdinfo, int cmd, unsigned int ctrl)
  42 {
  43         struct nand_chip *this = mtdinfo->priv;
  44         volatile u16 *nCE = (u16 *) CONFIG_SYS_LATCH_ADDR;
  45
  46         if (ctrl & NAND_CTRL_CHANGE) {
  47                 ulong IO_ADDR_W = (ulong) this->IO_ADDR_W;
  48
  49                 IO_ADDR_W &= ~(SET_ALE | SET_CLE);
  50
  51                 if (ctrl & NAND_NCE)
  52                         *nCE &= 0xFFFB;
  53                 else
  54                         *nCE |= 0x0004;
  55
  56                 if (ctrl & NAND_CLE)
  57                         IO_ADDR_W |= SET_CLE;
  58                 if (ctrl & NAND_ALE)
  59                         IO_ADDR_W |= SET_ALE;
  60
  61                 this->IO_ADDR_W = (void *)IO_ADDR_W;
  62
  63         }
  64
  65         if (cmd != NAND_CMD_NONE)
  66                 writeb(cmd, this->IO_ADDR_W);
  67 }
  68
  69 int board_nand_init(struct nand_chip *nand)
  70 {
  71         volatile gpio_t *gpio = (gpio_t *) MMAP_GPIO;
  72         volatile fbcs_t *fbcs = (fbcs_t *) MMAP_FBCS;
  73
  74         fbcs->csmr2 &= ~FBCS_CSMR_WP;
  75
  76         /*
  77          * set up pin configuration - enabled 2nd output buffer's signals
  78          * (nand_ngpio - nCE USB1/2_PWR_EN, LATCH_GPIOs, LCD_VEEEN, etc)
  79          * to use nCE signal
  80          */
  81         gpio->par_timer &= ~GPIO_PAR_TIN3_TIN3;
  82         gpio->pddr_timer |= 0x08;
  83         gpio->ppd_timer |= 0x08;
  84         gpio->pclrr_timer = 0;
  85         gpio->podr_timer = 0;
  86
  87         nand->chip_delay = 60;
  88         nand->ecc.mode = NAND_ECC_SOFT;
  89         nand->cmd_ctrl = nand_hwcontrol;
  90
  91         return 0;
  92 }
  93 #endif