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git.ipfire.org Git - people/ms/u-boot.git/blob - board/sc3/sc3nand.c
3 * Heiko Schocher, DENX Software Engineering, hs@denx.de.
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
26 #if defined(CONFIG_CMD_NAND)
29 #include <asm/processor.h>
31 #define readb(addr) *(volatile u_char *)(addr)
32 #define readl(addr) *(volatile u_long *)(addr)
33 #define writeb(d,addr) *(volatile u_char *)(addr) = (d)
35 #define SC3_NAND_ALE 29 /* GPIO PIN 3 */
36 #define SC3_NAND_CLE 30 /* GPIO PIN 2 */
37 #define SC3_NAND_CE 27 /* GPIO PIN 5 */
39 static void *sc3_io_base
;
40 static void *sc3_control_base
= (void *)0xEF600700;
42 static void sc3_nand_hwcontrol(struct mtd_info
*mtd
, int cmd
, unsigned int ctrl
)
44 struct nand_chip
*this = mtd
->priv
;
45 if (ctrl
& NAND_CTRL_CHANGE
) {
46 if ( ctrl
& NAND_CLE
)
47 set_bit (SC3_NAND_CLE
, sc3_control_base
);
49 clear_bit (SC3_NAND_CLE
, sc3_control_base
);
50 if ( ctrl
& NAND_ALE
)
51 set_bit (SC3_NAND_ALE
, sc3_control_base
);
53 clear_bit (SC3_NAND_ALE
, sc3_control_base
);
54 if ( ctrl
& NAND_NCE
)
55 set_bit (SC3_NAND_CE
, sc3_control_base
);
57 clear_bit (SC3_NAND_CE
, sc3_control_base
);
60 if (cmd
!= NAND_CMD_NONE
)
61 writeb(cmd
, this->IO_ADDR_W
);
64 static int sc3_nand_dev_ready(struct mtd_info
*mtd
)
66 if (!(readl(sc3_control_base
+ 0x1C) & 0x4000))
71 static void sc3_select_chip(struct mtd_info
*mtd
, int chip
)
73 clear_bit (SC3_NAND_CE
, sc3_control_base
);
76 int board_nand_init(struct nand_chip
*nand
)
78 nand
->ecc
.mode
= NAND_ECC_SOFT
;
80 sc3_io_base
= (void *) CONFIG_SYS_NAND_BASE
;
81 /* Set address of NAND IO lines (Using Linear Data Access Region) */
82 nand
->IO_ADDR_R
= (void __iomem
*) sc3_io_base
;
83 nand
->IO_ADDR_W
= (void __iomem
*) sc3_io_base
;
84 /* Reference hardware control function */
85 nand
->cmd_ctrl
= sc3_nand_hwcontrol
;
86 nand
->dev_ready
= sc3_nand_dev_ready
;
87 nand
->select_chip
= sc3_select_chip
;