blob: f95b584b314067ceef1664d8a76ef85898319c42 [file] [log] [blame]
Aubrey Li26bf7de2007-03-19 01:24:52 +08001/*
2 * (C) Copyright 2006 Aubrey.Li, aubrey.li@analog.com
3 *
4 * See file CREDITS for list of people who contributed to this
5 * project.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
20 * MA 02111-1307 USA
21 */
22
23#include <common.h>
24#include <asm/io.h>
25
Jon Loeligerfcec2eb2007-07-09 18:19:09 -050026#if defined(CONFIG_CMD_NAND)
Aubrey Li26bf7de2007-03-19 01:24:52 +080027
28#include <nand.h>
29
30#define CONCAT(a,b,c,d) a ## b ## c ## d
31#define PORT(a,b) CONCAT(pPORT,a,b,)
32
33#ifndef CONFIG_NAND_GPIO_PORT
34#define CONFIG_NAND_GPIO_PORT F
35#endif
36
37/*
38 * hardware specific access to control-lines
39 */
40static void bfin_hwcontrol(struct mtd_info *mtd, int cmd)
41{
42 register struct nand_chip *this = mtd->priv;
43
44 switch (cmd) {
45
46 case NAND_CTL_SETCLE:
47 this->IO_ADDR_W = CFG_NAND_BASE + BFIN_NAND_CLE;
48 break;
49 case NAND_CTL_CLRCLE:
50 this->IO_ADDR_W = CFG_NAND_BASE;
51 break;
52
53 case NAND_CTL_SETALE:
54 this->IO_ADDR_W = CFG_NAND_BASE + BFIN_NAND_ALE;
55 break;
56 case NAND_CTL_CLRALE:
57 this->IO_ADDR_W = CFG_NAND_BASE;
58 break;
59 case NAND_CTL_SETNCE:
60 case NAND_CTL_CLRNCE:
61 break;
62 }
63
64 this->IO_ADDR_R = this->IO_ADDR_W;
65
66 /* Drain the writebuffer */
67 sync();
68}
69
70int bfin_device_ready(struct mtd_info *mtd)
71{
72 int ret = (*PORT(CONFIG_NAND_GPIO_PORT, IO) & BFIN_NAND_READY) ? 1 : 0;
73 sync();
74 return ret;
75}
76
77/*
78 * Board-specific NAND initialization. The following members of the
79 * argument are board-specific (per include/linux/mtd/nand.h):
80 * - IO_ADDR_R?: address to read the 8 I/O lines of the flash device
81 * - IO_ADDR_W?: address to write the 8 I/O lines of the flash device
82 * - hwcontrol: hardwarespecific function for accesing control-lines
83 * - dev_ready: hardwarespecific function for accesing device ready/busy line
84 * - enable_hwecc?: function to enable (reset) hardware ecc generator. Must
85 * only be provided if a hardware ECC is available
86 * - eccmode: mode of ecc, see defines
87 * - chip_delay: chip dependent delay for transfering data from array to
88 * read regs (tR)
89 * - options: various chip options. They can partly be set to inform
90 * nand_scan about special functionality. See the defines for further
91 * explanation
92 * Members with a "?" were not set in the merged testing-NAND branch,
93 * so they are not set here either.
94 */
95void board_nand_init(struct nand_chip *nand)
96{
97 *PORT(CONFIG_NAND_GPIO_PORT, _FER) &= ~BFIN_NAND_READY;
98 *PORT(CONFIG_NAND_GPIO_PORT, IO_DIR) &= ~BFIN_NAND_READY;
99 *PORT(CONFIG_NAND_GPIO_PORT, IO_INEN) |= BFIN_NAND_READY;
100
101 nand->hwcontrol = bfin_hwcontrol;
102 nand->eccmode = NAND_ECC_SOFT;
103 nand->dev_ready = bfin_device_ready;
104 nand->chip_delay = 30;
105}
Jon Loeligerfcec2eb2007-07-09 18:19:09 -0500106#endif