2 * (C) Copyright 2006-2008
3 * Stefan Roese, DENX Software Engineering, sr@denx.de.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of
8 * the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25 static int nand_ecc_pos
[] = CONFIG_SYS_NAND_ECCPOS
;
26 static nand_info_t mtd
;
27 static struct nand_chip nand_chip
;
29 #if (CONFIG_SYS_NAND_PAGE_SIZE <= 512)
31 * NAND command for small page NAND devices (512)
33 static int nand_command(int block
, int page
, uint32_t offs
,
36 struct nand_chip
*this = mtd
.priv
;
37 int page_addr
= page
+ block
* CONFIG_SYS_NAND_PAGE_COUNT
;
39 while (!this->dev_ready(&mtd
))
42 /* Begin command latch cycle */
43 this->cmd_ctrl(&mtd
, cmd
, NAND_CTRL_CLE
| NAND_CTRL_CHANGE
);
44 /* Set ALE and clear CLE to start address cycle */
46 this->cmd_ctrl(&mtd
, offs
, NAND_CTRL_ALE
| NAND_CTRL_CHANGE
);
47 this->cmd_ctrl(&mtd
, page_addr
& 0xff, NAND_CTRL_ALE
); /* A[16:9] */
48 this->cmd_ctrl(&mtd
, (page_addr
>> 8) & 0xff,
49 NAND_CTRL_ALE
); /* A[24:17] */
50 #ifdef CONFIG_SYS_NAND_4_ADDR_CYCLE
51 /* One more address cycle for devices > 32MiB */
52 this->cmd_ctrl(&mtd
, (page_addr
>> 16) & 0x0f,
53 NAND_CTRL_ALE
); /* A[28:25] */
55 /* Latch in address */
56 this->cmd_ctrl(&mtd
, NAND_CMD_NONE
, NAND_NCE
| NAND_CTRL_CHANGE
);
59 * Wait a while for the data to be ready
61 while (!this->dev_ready(&mtd
))
68 * NAND command for large page NAND devices (2k)
70 static int nand_command(int block
, int page
, uint32_t offs
,
73 struct nand_chip
*this = mtd
.priv
;
74 int page_addr
= page
+ block
* CONFIG_SYS_NAND_PAGE_COUNT
;
75 void (*hwctrl
)(struct mtd_info
*mtd
, int cmd
,
76 unsigned int ctrl
) = this->cmd_ctrl
;
78 while (!this->dev_ready(&mtd
))
81 /* Emulate NAND_CMD_READOOB */
82 if (cmd
== NAND_CMD_READOOB
) {
83 offs
+= CONFIG_SYS_NAND_PAGE_SIZE
;
87 /* Shift the offset from byte addressing to word addressing. */
88 if (this->options
& NAND_BUSWIDTH_16
)
91 /* Begin command latch cycle */
92 hwctrl(&mtd
, cmd
, NAND_CTRL_CLE
| NAND_CTRL_CHANGE
);
93 /* Set ALE and clear CLE to start address cycle */
95 hwctrl(&mtd
, offs
& 0xff,
96 NAND_CTRL_ALE
| NAND_CTRL_CHANGE
); /* A[7:0] */
97 hwctrl(&mtd
, (offs
>> 8) & 0xff, NAND_CTRL_ALE
); /* A[11:9] */
99 hwctrl(&mtd
, (page_addr
& 0xff), NAND_CTRL_ALE
); /* A[19:12] */
100 hwctrl(&mtd
, ((page_addr
>> 8) & 0xff),
101 NAND_CTRL_ALE
); /* A[27:20] */
102 #ifdef CONFIG_SYS_NAND_5_ADDR_CYCLE
103 /* One more address cycle for devices > 128MiB */
104 hwctrl(&mtd
, (page_addr
>> 16) & 0x0f,
105 NAND_CTRL_ALE
); /* A[31:28] */
107 /* Latch in address */
108 hwctrl(&mtd
, NAND_CMD_READSTART
,
109 NAND_CTRL_CLE
| NAND_CTRL_CHANGE
);
110 hwctrl(&mtd
, NAND_CMD_NONE
, NAND_NCE
| NAND_CTRL_CHANGE
);
113 * Wait a while for the data to be ready
115 while (!this->dev_ready(&mtd
))
122 static int nand_is_bad_block(int block
)
124 struct nand_chip
*this = mtd
.priv
;
126 nand_command(block
, 0, CONFIG_SYS_NAND_BAD_BLOCK_POS
,
130 * Read one byte (or two if it's a 16 bit chip).
132 if (this->options
& NAND_BUSWIDTH_16
) {
133 if (readw(this->IO_ADDR_R
) != 0xffff)
136 if (readb(this->IO_ADDR_R
) != 0xff)
143 static int nand_read_page(int block
, int page
, void *dst
)
145 struct nand_chip
*this = mtd
.priv
;
150 int eccsize
= CONFIG_SYS_NAND_ECCSIZE
;
151 int eccbytes
= CONFIG_SYS_NAND_ECCBYTES
;
152 int eccsteps
= CONFIG_SYS_NAND_ECCSTEPS
;
156 nand_command(block
, page
, 0, NAND_CMD_READ0
);
158 /* No malloc available for now, just use some temporary locations
161 ecc_calc
= (u_char
*)(CONFIG_SYS_SDRAM_BASE
+ 0x10000);
162 ecc_code
= ecc_calc
+ 0x100;
163 oob_data
= ecc_calc
+ 0x200;
165 for (i
= 0; eccsteps
; eccsteps
--, i
+= eccbytes
, p
+= eccsize
) {
166 this->ecc
.hwctl(&mtd
, NAND_ECC_READ
);
167 this->read_buf(&mtd
, p
, eccsize
);
168 this->ecc
.calculate(&mtd
, p
, &ecc_calc
[i
]);
170 this->read_buf(&mtd
, oob_data
, CONFIG_SYS_NAND_OOBSIZE
);
172 /* Pick the ECC bytes out of the oob data */
173 for (i
= 0; i
< CONFIG_SYS_NAND_ECCTOTAL
; i
++)
174 ecc_code
[i
] = oob_data
[nand_ecc_pos
[i
]];
176 eccsteps
= CONFIG_SYS_NAND_ECCSTEPS
;
179 for (i
= 0 ; eccsteps
; eccsteps
--, i
+= eccbytes
, p
+= eccsize
) {
180 /* No chance to do something with the possible error message
181 * from correct_data(). We just hope that all possible errors
182 * are corrected by this routine.
184 stat
= this->ecc
.correct(&mtd
, p
, &ecc_code
[i
], &ecc_calc
[i
]);
190 int nand_spl_load_image(uint32_t offs
, unsigned int size
, void *dst
)
192 unsigned int block
, lastblock
;
196 * offs has to be aligned to a page address!
198 block
= offs
/ CONFIG_SYS_NAND_BLOCK_SIZE
;
199 lastblock
= (offs
+ size
- 1) / CONFIG_SYS_NAND_BLOCK_SIZE
;
200 page
= (offs
% CONFIG_SYS_NAND_BLOCK_SIZE
) / CONFIG_SYS_NAND_PAGE_SIZE
;
202 while (block
<= lastblock
) {
203 if (!nand_is_bad_block(block
)) {
207 while (page
< CONFIG_SYS_NAND_PAGE_COUNT
) {
208 nand_read_page(block
, page
, dst
);
209 dst
+= CONFIG_SYS_NAND_PAGE_SIZE
;
224 /* nand_init() - initialize data to make nand usable by SPL */
228 * Init board specific nand support
230 mtd
.priv
= &nand_chip
;
231 nand_chip
.IO_ADDR_R
= nand_chip
.IO_ADDR_W
=
232 (void __iomem
*)CONFIG_SYS_NAND_BASE
;
233 nand_chip
.options
= 0;
234 board_nand_init(&nand_chip
);
236 if (nand_chip
.select_chip
)
237 nand_chip
.select_chip(&mtd
, 0);
240 /* Unselect after operation */
241 void nand_deselect(void)
243 if (nand_chip
.select_chip
)
244 nand_chip
.select_chip(&mtd
, -1);