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git.ipfire.org Git - people/ms/u-boot.git/blob - board/nc650/nand.c
2 * (C) Copyright 2006 Detlev Zundel, dzu@denx.de
3 * (C) Copyright 2006 DENX Software Engineering
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,
27 #if defined(CONFIG_CMD_NAND)
31 #if defined(CONFIG_IDS852_REV1)
33 * hardware specific access to control-lines
35 static void nc650_hwcontrol(struct mtd_info
*mtd
, int cmd
, unsigned int ctrl
)
37 struct nand_chip
*this = mtd
->priv
;
39 if (ctrl
& NAND_CTRL_CHANGE
) {
40 if ( ctrl
& NAND_CLE
)
44 if ( ctrl
& NAND_ALE
)
50 if (cmd
!= NAND_CMD_NONE
)
51 writeb(cmd
, this->IO_ADDR_W
);
53 #elif defined(CONFIG_IDS852_REV2)
55 * hardware specific access to control-lines
57 static void nc650_hwcontrol(struct mtd_info
*mtd
, int cmd
, unsigned int ctrl
)
59 struct nand_chip
*this = mtd
->priv
;
61 if (ctrl
& NAND_CTRL_CHANGE
) {
62 if ( ctrl
& NAND_CLE
)
63 writeb(0, (volatile __u8
*) this->IO_ADDR_W
+ 0xa);
65 writeb(0, (volatile __u8
*) this->IO_ADDR_W
) + 0x8);
66 if ( ctrl
& NAND_ALE
)
67 writeb(0, (volatile __u8
*) this->IO_ADDR_W
) + 0x9);
69 writeb(0, (volatile __u8
*) this->IO_ADDR_W
) + 0x8);
70 if ( ctrl
& NAND_NCE
)
71 writeb(0, (volatile __u8
*) this->IO_ADDR_W
) + 0x8);
73 writeb(0, (volatile __u8
*) this->IO_ADDR_W
) + 0xc);
76 if (cmd
!= NAND_CMD_NONE
)
77 writeb(cmd
, this->IO_ADDR_W
);
80 #error Unknown IDS852 module revision
84 * Board-specific NAND initialization. The following members of the
85 * argument are board-specific (per include/linux/mtd/nand.h):
86 * - IO_ADDR_R?: address to read the 8 I/O lines of the flash device
87 * - IO_ADDR_W?: address to write the 8 I/O lines of the flash device
88 * - cmd_ctrl: hardwarespecific function for accesing control-lines
89 * - dev_ready: hardwarespecific function for accesing device ready/busy line
90 * - enable_hwecc?: function to enable (reset) hardware ecc generator. Must
91 * only be provided if a hardware ECC is available
92 * - eccm.ode: mode of ecc, see defines
93 * - chip_delay: chip dependent delay for transfering data from array to
95 * - options: various chip options. They can partly be set to inform
96 * nand_scan about special functionality. See the defines for further
98 * Members with a "?" were not set in the merged testing-NAND branch,
99 * so they are not set here either.
101 int board_nand_init(struct nand_chip
*nand
)
104 nand
->cmd_ctrl
= nc650_hwcontrol
;
105 nand
->ecc
.mode
= NAND_ECC_SOFT
;
106 nand
->chip_delay
= 12;
107 /* nand->options = NAND_SAMSUNG_LP_OPTIONS;*/