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                         ONENAND_REG_START_ADDRESS1);
  53
  54         onenand_writew(onenand_bufferram_address(block),
  55                         ONENAND_REG_START_ADDRESS2);
  56
  57         onenand_writew(onenand_sector_address(page),
  58                         ONENAND_REG_START_ADDRESS8);
  59
  60         onenand_writew(onenand_buffer_address(),
  61                         ONENAND_REG_START_BUFFER);
  62
  63         onenand_writew(ONENAND_INT_CLEAR, ONENAND_REG_INTERRUPT);
  64
  65         onenand_writew(ONENAND_CMD_READ, ONENAND_REG_COMMAND);
  66
  67 #ifndef __HAVE_ARCH_MEMCPY32
  68         p = (unsigned long *) buf;
  69 #endif
  70         base = (unsigned long *) (CONFIG_SYS_ONENAND_BASE + ONENAND_DATARAM);
  71
  72         while (!(READ_INTERRUPT() & ONENAND_INT_READ))
  73                 continue;
  74
  75         /* Check for invalid block mark */
  76         if (page < 2 && (onenand_readw(ONENAND_SPARERAM) != 0xffff))
  77                 return 1;
  78
  79 #ifdef __HAVE_ARCH_MEMCPY32
  80         /* 32 bytes boundary memory copy */
  81         memcpy32(buf, base, pagesize);
  82 #else
  83         for (offset = 0; offset < (pagesize >> 2); offset++) {
  84                 value = *(base + offset);
  85                 *p++ = value;
  86         }
  87 #endif
  88
  89         return 0;
  90 }
  91
  92 #define ONENAND_START_PAGE              1
  93 #define ONENAND_PAGES_PER_BLOCK         64
  94
  95 /**
  96  * onenand_read_block - Read CONFIG_SYS_MONITOR_LEN from begining
  97  *                      of OneNAND, skipping bad blocks
  98  * @return 0 on success
  99  */
 100 int onenand_read_block(unsigned char *buf)
 101 {
 102         int block;
 103         int page = ONENAND_START_PAGE, offset = 0;
 104         int pagesize = 0, erase_shift = 0;
 105         int erasesize = 0, nblocks = 0;
 106
 107         if (onenand_readw(ONENAND_REG_TECHNOLOGY)) {
 108                 pagesize = 4096; /* MLC OneNAND has 4KiB pagesize */
 109                 erase_shift = 18;
 110         } else {
 111                 pagesize = 2048;
 112                 erase_shift = 17;
 113         }
 114
 115         erasesize = ONENAND_PAGES_PER_BLOCK * pagesize;
 116         nblocks = (CONFIG_SYS_MONITOR_LEN + erasesize - 1) >> erase_shift;
 117
 118         /* NOTE: you must read page from page 1 of block 0 */
 119         /* read the block page by page*/
 120         for (block = 0; block < nblocks; block++) {
 121                 for (; page < ONENAND_PAGES_PER_BLOCK; page++) {
 122                         if (onenand_read_page(block, page, buf + offset,
 123                                                 pagesize)) {
 124                                 /* This block is bad. Skip it
 125                                  * and read next block */
 126                                 offset -= page * pagesize;
 127                                 nblocks++;
 128                                 break;
 129                         }
 130                         offset += pagesize;
 131                 }
 132                 page = 0;
 133         }
 134
 135         return 0;
 136 }