LXR uboot/onenand_ipl/onenand

   1/*
   2 * (C) Copyright 2005-2009 Samsung Electronics
   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
  37extern void *memcpy32(void *dest, void *src, int size);
  38#endif
  39
  40int (*onenand_read_page)(ulong block, ulong page, u_char *buf, int pagesize);
  41
  42/* read a page with ECC */
  43static int generic_onenand_read_page(ulong block, ulong page,
  44                                u_char * buf, int pagesize)
  45{
  46        unsigned long *base;
  47
  48#ifndef __HAVE_ARCH_MEMCPY32
  49        unsigned int offset, value;
  50        unsigned long *p;
  51#endif
  52
  53        onenand_writew(onenand_block_address(block),
  54                        ONENAND_REG_START_ADDRESS1);
  55
  56        onenand_writew(onenand_bufferram_address(block),
  57                        ONENAND_REG_START_ADDRESS2);
  58
  59        onenand_writew(onenand_sector_address(page),
  60                        ONENAND_REG_START_ADDRESS8);
  61
  62        onenand_writew(onenand_buffer_address(),
  63                        ONENAND_REG_START_BUFFER);
  64
  65        onenand_writew(ONENAND_INT_CLEAR, ONENAND_REG_INTERRUPT);
  66
  67        onenand_writew(ONENAND_CMD_READ, ONENAND_REG_COMMAND);
  68
  69#ifndef __HAVE_ARCH_MEMCPY32
  70        p = (unsigned long *) buf;
  71#endif
  72        base = (unsigned long *) (CONFIG_SYS_ONENAND_BASE + ONENAND_DATARAM);
  73
  74        while (!(READ_INTERRUPT() & ONENAND_INT_READ))
  75                continue;
  76
  77        /* Check for invalid block mark */
  78        if (page < 2 && (onenand_readw(ONENAND_SPARERAM) != 0xffff))
  79                return 1;
  80
  81#ifdef __HAVE_ARCH_MEMCPY32
  82        /* 32 bytes boundary memory copy */
  83        memcpy32(buf, base, pagesize);
  84#else
  85        for (offset = 0; offset < (pagesize >> 2); offset++) {
  86                value = *(base + offset);
  87                *p++ = value;
  88        }
  89#endif
  90
  91        return 0;
  92}
  93
  94#ifndef CONFIG_ONENAND_START_PAGE
  95#define CONFIG_ONENAND_START_PAGE       1
  96#endif
  97#define ONENAND_PAGES_PER_BLOCK         64
  98
  99static void onenand_generic_init(int *page_is_4KiB, int *page)
 100{
 101        int dev_id, density;
 102
 103        if (onenand_readw(ONENAND_REG_TECHNOLOGY))
 104                *page_is_4KiB = 1;
 105        dev_id = onenand_readw(ONENAND_REG_DEVICE_ID);
 106        density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
 107        density &= ONENAND_DEVICE_DENSITY_MASK;
 108        if (density >= ONENAND_DEVICE_DENSITY_4Gb &&
 109            !(dev_id & ONENAND_DEVICE_IS_DDP))
 110                *page_is_4KiB = 1;
 111}
 112
 113/**
 114 * onenand_read_block - Read CONFIG_SYS_MONITOR_LEN from begining
 115 *                      of OneNAND, skipping bad blocks
 116 * @return 0 on success
 117 */
 118int onenand_read_block(unsigned char *buf)
 119{
 120        int block, nblocks;
 121        int page = CONFIG_ONENAND_START_PAGE, offset = 0;
 122        int pagesize, erasesize, erase_shift;
 123        int page_is_4KiB = 0;
 124
 125        onenand_read_page = generic_onenand_read_page;
 126
 127        onenand_generic_init(&page_is_4KiB, &page);
 128
 129        if (page_is_4KiB) {
 130                pagesize = 4096; /* OneNAND has 4KiB pagesize */
 131                erase_shift = 18;
 132        } else {
 133                pagesize = 2048; /* OneNAND has 2KiB pagesize */
 134                erase_shift = 17;
 135        }
 136
 137        erasesize = (1 << erase_shift);
 138        nblocks = (CONFIG_SYS_MONITOR_LEN + erasesize - 1) >> erase_shift;
 139
 140        /* NOTE: you must read page from page 1 of block 0 */
 141        /* read the block page by page */
 142        for (block = 0; block < nblocks; block++) {
 143                for (; page < ONENAND_PAGES_PER_BLOCK; page++) {
 144                        if (onenand_read_page(block, page, buf + offset,
 145                                                pagesize)) {
 146                                /* This block is bad. Skip it
 147                                 * and read next block */
 148                                offset -= page * pagesize;
 149                                nblocks++;
 150                                break;
 151                        }
 152                        offset += pagesize;
 153                }
 154                page = 0;
 155        }
 156
 157        return 0;
 158}
 159