nand.c
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/*
* Copyright (C) 2010-2017 CS Systemes d'Information
* Florent Trinh Thai <florent.trinh-thai@c-s.fr>
* Christophe Leroy <christophe.leroy@c-s.fr>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#include <common.h>
#include <nand.h>
#include <asm/io.h>
#define BIT_CLE ((unsigned short)0x0800)
#define BIT_ALE ((unsigned short)0x0400)
#define BIT_NCE ((unsigned short)0x1000)
static void nand_hwcontrol(struct mtd_info *mtdinfo, int cmd, unsigned int ctrl)
{
struct nand_chip *this = mtdinfo->priv;
immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;
unsigned short pddat = 0;
/* The hardware control change */
if (ctrl & NAND_CTRL_CHANGE) {
pddat = in_be16(&immr->im_ioport.iop_pddat);
/* Clearing ALE and CLE */
pddat &= ~(BIT_CLE | BIT_ALE);
/* Driving NCE pin */
if (ctrl & NAND_NCE)
pddat &= ~BIT_NCE;
else
pddat |= BIT_NCE;
/* Driving CLE and ALE pin */
if (ctrl & NAND_CLE)
pddat |= BIT_CLE;
if (ctrl & NAND_ALE)
pddat |= BIT_ALE;
out_be16(&immr->im_ioport.iop_pddat, pddat);
}
/* Writing the command */
if (cmd != NAND_CMD_NONE)
out_8(this->IO_ADDR_W, cmd);
}
int board_nand_init(struct nand_chip *nand)
{
immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;
/* Set GPIO Port */
setbits_be16(&immr->im_ioport.iop_pddir, 0x1c00);
clrbits_be16(&immr->im_ioport.iop_pdpar, 0x1c00);
clrsetbits_be16(&immr->im_ioport.iop_pddat, 0x0c00, 0x1000);
nand->chip_delay = 60;
nand->ecc.mode = NAND_ECC_SOFT;
nand->cmd_ctrl = nand_hwcontrol;
return 0;
}