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/*
* Overview:
* Platform independend driver for NDFC (NanD Flash Controller)
* integrated into EP440 cores
*
* (C) Copyright 2006
* Stefan Roese, DENX Software Engineering, sr@denx.de.
*
* Based on original work by
* Thomas Gleixner
* Copyright 2006 IBM
*
* 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>
#if (CONFIG_COMMANDS & CFG_CMD_NAND) && !defined(CFG_NAND_LEGACY)
#include <nand.h>
#include <linux/mtd/ndfc.h>
#include <asm/processor.h>
#include <ppc440.h>
static u8 hwctl = 0;
static void ndfc_hwcontrol(struct mtd_info *mtdinfo, int cmd)
{
switch (cmd) {
case NAND_CTL_SETCLE:
hwctl |= 0x1;
break;
case NAND_CTL_CLRCLE:
hwctl &= ~0x1;
break;
case NAND_CTL_SETALE:
hwctl |= 0x2;
break;
case NAND_CTL_CLRALE:
hwctl &= ~0x2;
break;
}
}
static void ndfc_write_byte(struct mtd_info *mtdinfo, u_char byte)
{
struct nand_chip *this = mtdinfo->priv;
ulong base = (ulong) this->IO_ADDR_W;
if (hwctl & 0x1)
out8(base + NDFC_CMD, byte);
else if (hwctl & 0x2)
out8(base + NDFC_ALE, byte);
else
out8(base + NDFC_DATA, byte);
}
static u_char ndfc_read_byte(struct mtd_info *mtdinfo)
{
struct nand_chip *this = mtdinfo->priv;
ulong base = (ulong) this->IO_ADDR_W;
return (in8(base + NDFC_DATA));
}
static int ndfc_dev_ready(struct mtd_info *mtdinfo)
{
struct nand_chip *this = mtdinfo->priv;
ulong base = (ulong) this->IO_ADDR_W;
while (!(in32(base + NDFC_STAT) & NDFC_STAT_IS_READY))
;
return 1;
}
#ifndef CONFIG_NAND_SPL
/*
* Don't use these speedup functions in NAND boot image, since the image
* has to fit into 4kByte.
*/
/*
* Speedups for buffer read/write/verify
*
* NDFC allows 32bit read/write of data. So we can speed up the buffer
* functions. No further checking, as nand_base will always read/write
* page aligned.
*/
static void ndfc_read_buf(struct mtd_info *mtdinfo, uint8_t *buf, int len)
{
struct nand_chip *this = mtdinfo->priv;
ulong base = (ulong) this->IO_ADDR_W;
uint32_t *p = (uint32_t *) buf;
for(;len > 0; len -= 4)
*p++ = in32(base + NDFC_DATA);
}
static void ndfc_write_buf(struct mtd_info *mtdinfo, const uint8_t *buf, int len)
{
struct nand_chip *this = mtdinfo->priv;
ulong base = (ulong) this->IO_ADDR_W;
uint32_t *p = (uint32_t *) buf;
for(; len > 0; len -= 4)
out32(base + NDFC_DATA, *p++);
}
static int ndfc_verify_buf(struct mtd_info *mtdinfo, const uint8_t *buf, int len)
{
struct nand_chip *this = mtdinfo->priv;
ulong base = (ulong) this->IO_ADDR_W;
uint32_t *p = (uint32_t *) buf;
for(; len > 0; len -= 4)
if (*p++ != in32(base + NDFC_DATA))
return -1;
return 0;
}
#endif /* #ifndef CONFIG_NAND_SPL */
void board_nand_init(struct nand_chip *nand)
{
nand->eccmode = NAND_ECC_SOFT;
nand->hwcontrol = ndfc_hwcontrol;
nand->read_byte = ndfc_read_byte;
nand->write_byte = ndfc_write_byte;
nand->dev_ready = ndfc_dev_ready;
#ifndef CONFIG_NAND_SPL
nand->write_buf = ndfc_write_buf;
nand->read_buf = ndfc_read_buf;
nand->verify_buf = ndfc_verify_buf;
#else
/*
* Setup EBC (CS0 only right now)
*/
mtdcr(ebccfga, xbcfg);
mtdcr(ebccfgd, 0xb8400000);
mtebc(pb0cr, CFG_EBC_PB0CR);
mtebc(pb0ap, CFG_EBC_PB0AP);
#endif
/* Set NandFlash Core Configuration Register */
/* Chip select 3, 1col x 2 rows */
out32(CFG_NAND_BASE + NDFC_CCR, 0x00000000 | (CFG_NAND_CS << 24));
out32(CFG_NAND_BASE + NDFC_BCFG0 + (CFG_NAND_CS << 2), 0x80002222);
}
#endif
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