Merge branch 'master' of git://www.denx.de/git/u-boot-coldfire
[platform/kernel/u-boot.git] / onenand_ipl / onenand_read.c
1 /*
2  * (C) Copyright 2005-2008 Samsung Electronis
3  * Kyungmin Park <kyungmin.park@samsung.com>
4  *
5  * See file CREDITS for list of people who contributed to this
6  * project.
7  *
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.
12  *
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.
17  *
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,
21  * MA 02111-1307 USA
22  */
23
24 #include <common.h>
25
26 #include <asm/io.h>
27 #include <asm/string.h>
28
29 #include "onenand_ipl.h"
30
31 #define onenand_block_address(block)            (block)
32 #define onenand_sector_address(page)            (page << 2)
33 #define onenand_buffer_address()                ((1 << 3) << 8)
34 #define onenand_bufferram_address(block)        (0)
35
36 #ifdef __HAVE_ARCH_MEMCPY32
37 extern void *memcpy32(void *dest, void *src, int size);
38 #endif
39
40 /* read a page with ECC */
41 static inline int onenand_read_page(ulong block, ulong page,
42                                 u_char * buf, int pagesize)
43 {
44         unsigned long *base;
45
46 #ifndef __HAVE_ARCH_MEMCPY32
47         unsigned int offset, value;
48         unsigned long *p;
49 #endif
50
51         onenand_writew(onenand_block_address(block),
52                 THIS_ONENAND(ONENAND_REG_START_ADDRESS1));
53
54         onenand_writew(onenand_bufferram_address(block),
55                 THIS_ONENAND(ONENAND_REG_START_ADDRESS2));
56
57         onenand_writew(onenand_sector_address(page),
58                 THIS_ONENAND(ONENAND_REG_START_ADDRESS8));
59
60         onenand_writew(onenand_buffer_address(),
61                 THIS_ONENAND(ONENAND_REG_START_BUFFER));
62
63         onenand_writew(ONENAND_INT_CLEAR, THIS_ONENAND(ONENAND_REG_INTERRUPT));
64
65         onenand_writew(ONENAND_CMD_READ, THIS_ONENAND(ONENAND_REG_COMMAND));
66
67 #ifndef __HAVE_ARCH_MEMCPY32
68         p = (unsigned long *) buf;
69 #endif
70         base = (unsigned long *) (CFG_ONENAND_BASE + ONENAND_DATARAM);
71
72         while (!(READ_INTERRUPT() & ONENAND_INT_READ))
73                 continue;
74
75 #ifdef __HAVE_ARCH_MEMCPY32
76         /* 32 bytes boundary memory copy */
77         memcpy32(buf, base, pagesize);
78 #else
79         for (offset = 0; offset < (pagesize >> 2); offset++) {
80                 value = *(base + offset);
81                 *p++ = value;
82         }
83 #endif
84
85         return 0;
86 }
87
88 #define ONENAND_START_PAGE              1
89 #define ONENAND_PAGES_PER_BLOCK         64
90
91 /**
92  * onenand_read_block - Read a block data to buf
93  * @return 0 on success
94  */
95 int onenand_read_block0(unsigned char *buf)
96 {
97         int page, offset = 0;
98         int pagesize = ONENAND_PAGE_SIZE;
99
100         /* MLC OneNAND has 4KiB page size */
101         if (onenand_readw(THIS_ONENAND(ONENAND_REG_TECHNOLOGY)))
102                 pagesize <<= 1;
103
104         /* NOTE: you must read page from page 1 of block 0 */
105         /* read the block page by page*/
106         for (page = ONENAND_START_PAGE;
107             page < ONENAND_PAGES_PER_BLOCK; page++) {
108
109                 onenand_read_page(0, page, buf + offset, pagesize);
110                 offset += pagesize;
111         }
112
113         return 0;
114 }