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 #define CONFIG_SYS_NAND_READ_DELAY \
26 { volatile int dummy; int i; for (i=0; i<10000; i++) dummy = i; }
28 static int nand_ecc_pos
[] = CONFIG_SYS_NAND_ECCPOS
;
30 #if (CONFIG_SYS_NAND_PAGE_SIZE <= 512)
32 * NAND command for small page NAND devices (512)
34 static int nand_command(struct mtd_info
*mtd
, int block
, int page
, int offs
, u8 cmd
)
36 struct nand_chip
*this = mtd
->priv
;
37 int page_addr
= page
+ block
* CONFIG_SYS_NAND_PAGE_COUNT
;
40 while (!this->dev_ready(mtd
))
43 CONFIG_SYS_NAND_READ_DELAY
;
45 /* Begin command latch cycle */
46 this->cmd_ctrl(mtd
, cmd
, NAND_CTRL_CLE
| NAND_CTRL_CHANGE
);
47 /* Set ALE and clear CLE to start address cycle */
49 this->cmd_ctrl(mtd
, offs
, NAND_CTRL_ALE
| NAND_CTRL_CHANGE
);
50 this->cmd_ctrl(mtd
, page_addr
& 0xff, 0); /* A[16:9] */
51 this->cmd_ctrl(mtd
, (page_addr
>> 8) & 0xff, 0); /* A[24:17] */
52 #ifdef CONFIG_SYS_NAND_4_ADDR_CYCLE
53 /* One more address cycle for devices > 32MiB */
54 this->cmd_ctrl(mtd
, (page_addr
>> 16) & 0x0f, 0); /* A[28:25] */
56 /* Latch in address */
57 this->cmd_ctrl(mtd
, NAND_CMD_NONE
, NAND_NCE
| NAND_CTRL_CHANGE
);
60 * Wait a while for the data to be ready
63 while (!this->dev_ready(mtd
))
66 CONFIG_SYS_NAND_READ_DELAY
;
72 * NAND command for large page NAND devices (2k)
74 static int nand_command(struct mtd_info
*mtd
, int block
, int page
, int offs
, u8 cmd
)
76 struct nand_chip
*this = mtd
->priv
;
77 int page_addr
= page
+ block
* CONFIG_SYS_NAND_PAGE_COUNT
;
80 while (!this->dev_ready(mtd
))
83 CONFIG_SYS_NAND_READ_DELAY
;
85 /* Emulate NAND_CMD_READOOB */
86 if (cmd
== NAND_CMD_READOOB
) {
87 offs
+= CONFIG_SYS_NAND_PAGE_SIZE
;
91 /* Begin command latch cycle */
92 this->cmd_ctrl(mtd
, cmd
, NAND_CTRL_CLE
| NAND_CTRL_CHANGE
);
93 /* Set ALE and clear CLE to start address cycle */
95 this->cmd_ctrl(mtd
, offs
& 0xff,
96 NAND_CTRL_ALE
| NAND_CTRL_CHANGE
); /* A[7:0] */
97 this->cmd_ctrl(mtd
, (offs
>> 8) & 0xff, 0); /* A[11:9] */
99 this->cmd_ctrl(mtd
, (page_addr
& 0xff), 0); /* A[19:12] */
100 this->cmd_ctrl(mtd
, ((page_addr
>> 8) & 0xff), 0); /* A[27:20] */
101 #ifdef CONFIG_SYS_NAND_5_ADDR_CYCLE
102 /* One more address cycle for devices > 128MiB */
103 this->cmd_ctrl(mtd
, (page_addr
>> 16) & 0x0f, 0); /* A[31:28] */
105 /* Latch in address */
106 this->cmd_ctrl(mtd
, NAND_CMD_READSTART
,
107 NAND_CTRL_CLE
| NAND_CTRL_CHANGE
);
108 this->cmd_ctrl(mtd
, NAND_CMD_NONE
, NAND_NCE
| NAND_CTRL_CHANGE
);
111 * Wait a while for the data to be ready
114 while (!this->dev_ready(mtd
))
117 CONFIG_SYS_NAND_READ_DELAY
;
123 static int nand_is_bad_block(struct mtd_info
*mtd
, int block
)
125 struct nand_chip
*this = mtd
->priv
;
127 nand_command(mtd
, block
, 0, CONFIG_SYS_NAND_BAD_BLOCK_POS
, NAND_CMD_READOOB
);
132 if (readb(this->IO_ADDR_R
) != 0xff)
138 static int nand_read_page(struct mtd_info
*mtd
, int block
, int page
, uchar
*dst
)
140 struct nand_chip
*this = mtd
->priv
;
145 int eccsize
= CONFIG_SYS_NAND_ECCSIZE
;
146 int eccbytes
= CONFIG_SYS_NAND_ECCBYTES
;
147 int eccsteps
= CONFIG_SYS_NAND_ECCSTEPS
;
151 nand_command(mtd
, block
, page
, 0, NAND_CMD_READ0
);
153 /* No malloc available for now, just use some temporary locations
156 ecc_calc
= (u_char
*)(CONFIG_SYS_SDRAM_BASE
+ 0x10000);
157 ecc_code
= ecc_calc
+ 0x100;
158 oob_data
= ecc_calc
+ 0x200;
160 for (i
= 0; eccsteps
; eccsteps
--, i
+= eccbytes
, p
+= eccsize
) {
161 this->ecc
.hwctl(mtd
, NAND_ECC_READ
);
162 this->read_buf(mtd
, p
, eccsize
);
163 this->ecc
.calculate(mtd
, p
, &ecc_calc
[i
]);
165 this->read_buf(mtd
, oob_data
, CONFIG_SYS_NAND_OOBSIZE
);
167 /* Pick the ECC bytes out of the oob data */
168 for (i
= 0; i
< CONFIG_SYS_NAND_ECCTOTAL
; i
++)
169 ecc_code
[i
] = oob_data
[nand_ecc_pos
[i
]];
171 eccsteps
= CONFIG_SYS_NAND_ECCSTEPS
;
174 for (i
= 0 ; eccsteps
; eccsteps
--, i
+= eccbytes
, p
+= eccsize
) {
175 /* No chance to do something with the possible error message
176 * from correct_data(). We just hope that all possible errors
177 * are corrected by this routine.
179 stat
= this->ecc
.correct(mtd
, p
, &ecc_code
[i
], &ecc_calc
[i
]);
185 static int nand_load(struct mtd_info
*mtd
, unsigned int offs
,
186 unsigned int uboot_size
, uchar
*dst
)
188 unsigned int block
, lastblock
;
192 * offs has to be aligned to a page address!
194 block
= offs
/ CONFIG_SYS_NAND_BLOCK_SIZE
;
195 lastblock
= (offs
+ uboot_size
- 1) / CONFIG_SYS_NAND_BLOCK_SIZE
;
196 page
= (offs
% CONFIG_SYS_NAND_BLOCK_SIZE
) / CONFIG_SYS_NAND_PAGE_SIZE
;
198 while (block
<= lastblock
) {
199 if (!nand_is_bad_block(mtd
, block
)) {
203 while (page
< CONFIG_SYS_NAND_PAGE_COUNT
) {
204 nand_read_page(mtd
, block
, page
, dst
);
205 dst
+= CONFIG_SYS_NAND_PAGE_SIZE
;
221 * The main entry for NAND booting. It's necessary that SDRAM is already
222 * configured and available since this code loads the main U-Boot image
223 * from NAND into SDRAM and starts it from there.
227 struct nand_chip nand_chip
;
228 nand_info_t nand_info
;
230 __attribute__((noreturn
)) void (*uboot
)(void);
233 * Init board specific nand support
235 nand_info
.priv
= &nand_chip
;
236 nand_chip
.IO_ADDR_R
= nand_chip
.IO_ADDR_W
= (void __iomem
*)CONFIG_SYS_NAND_BASE
;
237 nand_chip
.dev_ready
= NULL
; /* preset to NULL */
238 board_nand_init(&nand_chip
);
240 if (nand_chip
.select_chip
)
241 nand_chip
.select_chip(&nand_info
, 0);
244 * Load U-Boot image from NAND into RAM
246 ret
= nand_load(&nand_info
, CONFIG_SYS_NAND_U_BOOT_OFFS
, CONFIG_SYS_NAND_U_BOOT_SIZE
,
247 (uchar
*)CONFIG_SYS_NAND_U_BOOT_DST
);
249 if (nand_chip
.select_chip
)
250 nand_chip
.select_chip(&nand_info
, -1);
253 * Jump to U-Boot image
255 uboot
= (void *)CONFIG_SYS_NAND_U_BOOT_START
;