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/*
* (C) Copyright 2006 DENX Software Engineering
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <asm/io.h>
#if defined(CONFIG_CMD_NAND)
#include <nand.h>
/*
* hardware specific access to control-lines
* function borrowed from Linux 2.6 (drivers/mtd/nand/ppchameleonevb.c)
*/
static void ppchameleonevb_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
struct nand_chip *this = mtd->priv;
ulong base = (ulong) this->IO_ADDR_W;
if (ctrl & NAND_CTRL_CHANGE) {
if ( ctrl & NAND_CLE )
MACRO_NAND_CTL_SETCLE((unsigned long)base);
else
MACRO_NAND_CTL_CLRCLE((unsigned long)base);
if ( ctrl & NAND_ALE )
MACRO_NAND_CTL_CLRCLE((unsigned long)base);
else
MACRO_NAND_CTL_CLRALE((unsigned long)base);
if ( ctrl & NAND_NCE )
MACRO_NAND_ENABLE_CE((unsigned long)base);
else
MACRO_NAND_DISABLE_CE((unsigned long)base);
}
if (cmd != NAND_CMD_NONE)
writeb(cmd, this->IO_ADDR_W);
}
/*
* read device ready pin
* function +/- borrowed from Linux 2.6 (drivers/mtd/nand/ppchameleonevb.c)
*/
static int ppchameleonevb_device_ready(struct mtd_info *mtdinfo)
{
struct nand_chip *this = mtdinfo->priv;
ulong rb_gpio_pin;
/* use the base addr to find out which chip are we dealing with */
switch((ulong) this->IO_ADDR_W) {
case CFG_NAND0_BASE:
rb_gpio_pin = CFG_NAND0_RDY;
break;
case CFG_NAND1_BASE:
rb_gpio_pin = CFG_NAND1_RDY;
break;
default: /* this should never happen */
return 0;
break;
}
if (in32(GPIO0_IR) & rb_gpio_pin)
return 1;
return 0;
}
/*
* Board-specific NAND initialization. The following members of the
* argument are board-specific (per include/linux/mtd/nand.h):
* - IO_ADDR_R?: address to read the 8 I/O lines of the flash device
* - IO_ADDR_W?: address to write the 8 I/O lines of the flash device
* - cmd_ctrl: hardwarespecific function for accesing control-lines
* - dev_ready: hardwarespecific function for accesing device ready/busy line
* - enable_hwecc?: function to enable (reset) hardware ecc generator. Must
* only be provided if a hardware ECC is available
* - ecc.mode: mode of ecc, see defines
* - chip_delay: chip dependent delay for transfering data from array to
* read regs (tR)
* - options: various chip options. They can partly be set to inform
* nand_scan about special functionality. See the defines for further
* explanation
* Members with a "?" were not set in the merged testing-NAND branch,
* so they are not set here either.
*/
int board_nand_init(struct nand_chip *nand)
{
nand->cmd_ctrl = ppchameleonevb_hwcontrol;
nand->dev_ready = ppchameleonevb_device_ready;
nand->ecc.mode = NAND_ECC_SOFT;
nand->chip_delay = NAND_BIG_DELAY_US;
nand->options = NAND_SAMSUNG_LP_OPTIONS;
return 0;
}
#endif
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