xref: /openbmc/u-boot/board/xes/common/actl_nand.c (revision ea0364f1)
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