]>
git.ipfire.org Git - people/ms/u-boot.git/blob - board/socrates/nand.c
3 * Sergei Poselenov, Emcraft Systems, sposelenov@emcraft.com.
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(CFG_NAND_BASE)
28 #include <asm/errno.h>
32 static void nand_write_byte(struct mtd_info
*mtd
, u_char byte
);
33 static void nand_write_buf(struct mtd_info
*mtd
, const u_char
*buf
, int len
);
34 static void nand_write_word(struct mtd_info
*mtd
, u16 word
);
35 static u_char
nand_read_byte(struct mtd_info
*mtd
);
36 static u16
nand_read_word(struct mtd_info
*mtd
);
37 static void nand_read_buf(struct mtd_info
*mtd
, u_char
*buf
, int len
);
38 static int nand_verify_buf(struct mtd_info
*mtd
, const u_char
*buf
, int len
);
39 static int nand_device_ready(struct mtd_info
*mtdinfo
);
40 static void nand_hwcontrol(struct mtd_info
*mtdinfo
, int cmd
);
42 #define FPGA_NAND_CMD_MASK (0x7 << 28)
43 #define FPGA_NAND_CMD_COMMAND (0x0 << 28)
44 #define FPGA_NAND_CMD_ADDR (0x1 << 28)
45 #define FPGA_NAND_CMD_READ (0x2 << 28)
46 #define FPGA_NAND_CMD_WRITE (0x3 << 28)
47 #define FPGA_NAND_BUSY (0x1 << 15)
48 #define FPGA_NAND_ENABLE (0x1 << 31)
49 #define FPGA_NAND_DATA_SHIFT 16
52 * nand_write_byte - write one byte to the chip
53 * @mtd: MTD device structure
54 * @byte: pointer to data byte to write
56 static void nand_write_byte(struct mtd_info
*mtd
, u_char byte
)
58 nand_write_buf(mtd
, (const uchar
*)&byte
, sizeof(byte
));
62 * nand_write_word - write one word to the chip
63 * @mtd: MTD device structure
64 * @word: data word to write
66 static void nand_write_word(struct mtd_info
*mtd
, u16 word
)
68 nand_write_buf(mtd
, (const uchar
*)&word
, sizeof(word
));
72 * nand_write_buf - write buffer to chip
73 * @mtd: MTD device structure
75 * @len: number of bytes to write
77 static void nand_write_buf(struct mtd_info
*mtd
, const u_char
*buf
, int len
)
80 struct nand_chip
*this = mtd
->priv
;
83 if ((state
& FPGA_NAND_CMD_MASK
) == FPGA_NAND_CMD_MASK
) {
85 val
= (state
& FPGA_NAND_ENABLE
) | FPGA_NAND_CMD_WRITE
;
87 /* Write address or command */
91 for (i
= 0; i
< len
; i
++) {
92 out_be32(this->IO_ADDR_W
, val
| (buf
[i
] << FPGA_NAND_DATA_SHIFT
));
98 * nand_read_byte - read one byte from the chip
99 * @mtd: MTD device structure
101 static u_char
nand_read_byte(struct mtd_info
*mtd
)
104 nand_read_buf(mtd
, (uchar
*)&byte
, sizeof(byte
));
109 * nand_read_word - read one word from the chip
110 * @mtd: MTD device structure
112 static u16
nand_read_word(struct mtd_info
*mtd
)
115 nand_read_buf(mtd
, (uchar
*)&word
, sizeof(word
));
120 * nand_read_buf - read chip data into buffer
121 * @mtd: MTD device structure
122 * @buf: buffer to store date
123 * @len: number of bytes to read
125 static void nand_read_buf(struct mtd_info
*mtd
, u_char
*buf
, int len
)
128 struct nand_chip
*this = mtd
->priv
;
131 val
= (state
& FPGA_NAND_ENABLE
) | FPGA_NAND_CMD_READ
;
133 out_be32(this->IO_ADDR_W
, val
);
134 for (i
= 0; i
< len
; i
++) {
135 buf
[i
] = (in_be32(this->IO_ADDR_R
) >> FPGA_NAND_DATA_SHIFT
) & 0xff;
140 * nand_verify_buf - Verify chip data against buffer
141 * @mtd: MTD device structure
142 * @buf: buffer containing the data to compare
143 * @len: number of bytes to compare
145 static int nand_verify_buf(struct mtd_info
*mtd
, const u_char
*buf
, int len
)
149 for (i
= 0; i
< len
; i
++) {
150 if (buf
[i
] != nand_read_byte(mtd
));
157 * nand_device_ready - Check the NAND device is ready for next command.
158 * @mtd: MTD device structure
160 static int nand_device_ready(struct mtd_info
*mtdinfo
)
162 struct nand_chip
*this = mtdinfo
->priv
;
164 if (in_be32(this->IO_ADDR_W
) & FPGA_NAND_BUSY
)
170 * nand_hwcontrol - NAND control functions wrapper.
171 * @mtd: MTD device structure
174 static void nand_hwcontrol(struct mtd_info
*mtdinfo
, int cmd
)
178 case NAND_CTL_CLRALE
:
179 state
|= FPGA_NAND_CMD_MASK
; /* use all 1s to mark */
181 case NAND_CTL_CLRCLE
:
182 state
|= FPGA_NAND_CMD_MASK
; /* use all 1s to mark */
184 case NAND_CTL_SETCLE
:
185 state
= (state
& ~FPGA_NAND_CMD_MASK
) | FPGA_NAND_CMD_COMMAND
;
187 case NAND_CTL_SETALE
:
188 state
= (state
& ~FPGA_NAND_CMD_MASK
) | FPGA_NAND_CMD_ADDR
;
190 case NAND_CTL_SETNCE
:
191 state
|= FPGA_NAND_ENABLE
;
193 case NAND_CTL_CLRNCE
:
194 state
&= ~FPGA_NAND_ENABLE
;
197 printf("%s: unknown cmd %#x\n", __FUNCTION__
, cmd
);
202 int board_nand_init(struct nand_chip
*nand
)
204 nand
->hwcontrol
= nand_hwcontrol
;
205 nand
->eccmode
= NAND_ECC_SOFT
;
206 nand
->dev_ready
= nand_device_ready
;
207 nand
->write_byte
= nand_write_byte
;
208 nand
->read_byte
= nand_read_byte
;
209 nand
->write_word
= nand_write_word
;
210 nand
->read_word
= nand_read_word
;
211 nand
->write_buf
= nand_write_buf
;
212 nand
->read_buf
= nand_read_buf
;
213 nand
->verify_buf
= nand_verify_buf
;