136 lines
3.1 KiB
C
136 lines
3.1 KiB
C
/*
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* (C) Copyright 2009
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* Heiko Schocher, DENX Software Engineering, hs@denx.de
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <nand.h>
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#include <asm/io.h>
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#define CONFIG_NAND_MODE_REG (void *)(CONFIG_SYS_NAND_BASE + 0x20000)
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#define CONFIG_NAND_DATA_REG (void *)(CONFIG_SYS_NAND_BASE + 0x30000)
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#define read_mode() in_8(CONFIG_NAND_MODE_REG)
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#define write_mode(val) out_8(CONFIG_NAND_MODE_REG, val)
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#define read_data() in_8(CONFIG_NAND_DATA_REG)
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#define write_data(val) out_8(CONFIG_NAND_DATA_REG, val)
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#define KPN_RDY2 (1 << 7)
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#define KPN_RDY1 (1 << 6)
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#define KPN_WPN (1 << 4)
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#define KPN_CE2N (1 << 3)
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#define KPN_CE1N (1 << 2)
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#define KPN_ALE (1 << 1)
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#define KPN_CLE (1 << 0)
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#define KPN_DEFAULT_CHIP_DELAY 50
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static int kpn_chip_ready(void)
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{
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if (read_mode() & KPN_RDY1)
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return 1;
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return 0;
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}
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static void kpn_wait_rdy(void)
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{
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int cnt = 1000000;
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while (--cnt && !kpn_chip_ready())
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udelay(1);
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if (!cnt)
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printf ("timeout while waiting for RDY\n");
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}
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static void kpn_nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
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{
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u8 reg_val = read_mode();
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if (ctrl & NAND_CTRL_CHANGE) {
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reg_val = reg_val & ~(KPN_ALE + KPN_CLE);
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if (ctrl & NAND_CLE)
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reg_val = reg_val | KPN_CLE;
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if (ctrl & NAND_ALE)
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reg_val = reg_val | KPN_ALE;
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if (ctrl & NAND_NCE)
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reg_val = reg_val & ~KPN_CE1N;
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else
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reg_val = reg_val | KPN_CE1N;
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write_mode(reg_val);
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}
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if (cmd != NAND_CMD_NONE)
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write_data(cmd);
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/* wait until flash is ready */
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kpn_wait_rdy();
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}
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static u_char kpn_nand_read_byte(struct mtd_info *mtd)
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{
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return read_data();
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}
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static void kpn_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
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{
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int i;
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for (i = 0; i < len; i++) {
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write_data(buf[i]);
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kpn_wait_rdy();
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}
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}
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static void kpn_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
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{
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int i;
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for (i = 0; i < len; i++)
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buf[i] = read_data();
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}
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static int kpn_nand_dev_ready(struct mtd_info *mtd)
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{
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kpn_wait_rdy();
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return 1;
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}
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int board_nand_init(struct nand_chip *nand)
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{
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nand->ecc.mode = NAND_ECC_SOFT;
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/* Reference hardware control function */
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nand->cmd_ctrl = kpn_nand_hwcontrol;
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nand->read_byte = kpn_nand_read_byte;
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nand->write_buf = kpn_nand_write_buf;
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nand->read_buf = kpn_nand_read_buf;
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nand->dev_ready = kpn_nand_dev_ready;
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nand->chip_delay = KPN_DEFAULT_CHIP_DELAY;
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/* reset mode register */
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write_mode(KPN_CE1N + KPN_CE2N + KPN_WPN);
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return 0;
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}
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