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/*
* (C) Copyright 2009
* Heiko Schocher, DENX Software Engineering, hs@denx.de
*
* 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 <nand.h>
#include <asm/io.h>
#define CONFIG_NAND_MODE_REG (void *)(CONFIG_SYS_NAND_BASE + 0x20000)
#define CONFIG_NAND_DATA_REG (void *)(CONFIG_SYS_NAND_BASE + 0x30000)
#define read_mode() in_8(CONFIG_NAND_MODE_REG)
#define write_mode(val) out_8(CONFIG_NAND_MODE_REG, val)
#define read_data() in_8(CONFIG_NAND_DATA_REG)
#define write_data(val) out_8(CONFIG_NAND_DATA_REG, val)
#define KPN_RDY2 (1 << 7)
#define KPN_RDY1 (1 << 6)
#define KPN_WPN (1 << 4)
#define KPN_CE2N (1 << 3)
#define KPN_CE1N (1 << 2)
#define KPN_ALE (1 << 1)
#define KPN_CLE (1 << 0)
#define KPN_DEFAULT_CHIP_DELAY 50
static int kpn_chip_ready(void)
{
if (read_mode() & KPN_RDY1)
return 1;
return 0;
}
static void kpn_wait_rdy(void)
{
int cnt = 1000000;
while (--cnt && !kpn_chip_ready())
udelay(1);
if (!cnt)
printf ("timeout while waiting for RDY\n");
}
static void kpn_nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
u8 reg_val = read_mode();
if (ctrl & NAND_CTRL_CHANGE) {
reg_val = reg_val & ~(KPN_ALE + KPN_CLE);
if (ctrl & NAND_CLE)
reg_val = reg_val | KPN_CLE;
if (ctrl & NAND_ALE)
reg_val = reg_val | KPN_ALE;
if (ctrl & NAND_NCE)
reg_val = reg_val & ~KPN_CE1N;
else
reg_val = reg_val | KPN_CE1N;
write_mode(reg_val);
}
if (cmd != NAND_CMD_NONE)
write_data(cmd);
/* wait until flash is ready */
kpn_wait_rdy();
}
static u_char kpn_nand_read_byte(struct mtd_info *mtd)
{
return read_data();
}
static void kpn_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
{
int i;
for (i = 0; i < len; i++) {
write_data(buf[i]);
kpn_wait_rdy();
}
}
static void kpn_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
{
int i;
for (i = 0; i < len; i++)
buf[i] = read_data();
}
static int kpn_nand_dev_ready(struct mtd_info *mtd)
{
kpn_wait_rdy();
return 1;
}
int board_nand_init(struct nand_chip *nand)
{
nand->ecc.mode = NAND_ECC_SOFT;
/* Reference hardware control function */
nand->cmd_ctrl = kpn_nand_hwcontrol;
nand->read_byte = kpn_nand_read_byte;
nand->write_buf = kpn_nand_write_buf;
nand->read_buf = kpn_nand_read_buf;
nand->dev_ready = kpn_nand_dev_ready;
nand->chip_delay = KPN_DEFAULT_CHIP_DELAY;
/* reset mode register */
write_mode(KPN_CE1N + KPN_CE2N + KPN_WPN);
return 0;
}
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