1 /* 2 * Copyright 2008 Extreme Engineering Solutions, Inc. 3 * 4 * This driver support NAND devices which have address lines 5 * connected as ALE and CLE inputs. 6 * 7 * See file CREDITS for list of people who contributed to this 8 * project. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License as 12 * published by the Free Software Foundation; either version 2 of 13 * the License, or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 23 * MA 02111-1307 USA 24 */ 25 26 #include <common.h> 27 #include <nand.h> 28 #include <asm/io.h> 29 30 /* 31 * Hardware specific access to control-lines 32 */ 33 static void nand_addr_hwcontrol(struct mtd_info *mtd, int cmd, uint ctrl) 34 { 35 struct nand_chip *this = mtd->priv; 36 ulong IO_ADDR_W; 37 38 if (ctrl & NAND_CTRL_CHANGE) { 39 IO_ADDR_W = (ulong)this->IO_ADDR_W; 40 41 IO_ADDR_W &= ~(CONFIG_SYS_NAND_ACTL_CLE | 42 CONFIG_SYS_NAND_ACTL_ALE | 43 CONFIG_SYS_NAND_ACTL_NCE); 44 if (ctrl & NAND_CLE) 45 IO_ADDR_W |= CONFIG_SYS_NAND_ACTL_CLE; 46 if (ctrl & NAND_ALE) 47 IO_ADDR_W |= CONFIG_SYS_NAND_ACTL_ALE; 48 if (ctrl & NAND_NCE) 49 IO_ADDR_W |= CONFIG_SYS_NAND_ACTL_NCE; 50 51 this->IO_ADDR_W = (void *)IO_ADDR_W; 52 } 53 54 if (cmd != NAND_CMD_NONE) 55 writeb(cmd, this->IO_ADDR_W); 56 } 57 58 int board_nand_init(struct nand_chip *nand) 59 { 60 nand->ecc.mode = NAND_ECC_SOFT; 61 nand->cmd_ctrl = nand_addr_hwcontrol; 62 nand->chip_delay = CONFIG_SYS_NAND_ACTL_DELAY; 63 64 return 0; 65 } 66