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 *) (CONFIG_SYS_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 }