159 lines
4.1 KiB
C
159 lines
4.1 KiB
C
/*
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* (C) Copyright 2005-2009 Samsung Electronics
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* Kyungmin Park <kyungmin.park@samsung.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/string.h>
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#include "onenand_ipl.h"
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#define onenand_block_address(block) (block)
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#define onenand_sector_address(page) (page << 2)
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#define onenand_buffer_address() ((1 << 3) << 8)
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#define onenand_bufferram_address(block) (0)
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#ifdef __HAVE_ARCH_MEMCPY32
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extern void *memcpy32(void *dest, void *src, int size);
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#endif
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int (*onenand_read_page)(ulong block, ulong page, u_char *buf, int pagesize);
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/* read a page with ECC */
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static int generic_onenand_read_page(ulong block, ulong page,
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u_char * buf, int pagesize)
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{
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unsigned long *base;
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#ifndef __HAVE_ARCH_MEMCPY32
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unsigned int offset, value;
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unsigned long *p;
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#endif
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onenand_writew(onenand_block_address(block),
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ONENAND_REG_START_ADDRESS1);
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onenand_writew(onenand_bufferram_address(block),
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ONENAND_REG_START_ADDRESS2);
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onenand_writew(onenand_sector_address(page),
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ONENAND_REG_START_ADDRESS8);
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onenand_writew(onenand_buffer_address(),
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ONENAND_REG_START_BUFFER);
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onenand_writew(ONENAND_INT_CLEAR, ONENAND_REG_INTERRUPT);
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onenand_writew(ONENAND_CMD_READ, ONENAND_REG_COMMAND);
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#ifndef __HAVE_ARCH_MEMCPY32
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p = (unsigned long *) buf;
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#endif
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base = (unsigned long *) (CONFIG_SYS_ONENAND_BASE + ONENAND_DATARAM);
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while (!(READ_INTERRUPT() & ONENAND_INT_READ))
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continue;
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/* Check for invalid block mark */
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if (page < 2 && (onenand_readw(ONENAND_SPARERAM) != 0xffff))
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return 1;
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#ifdef __HAVE_ARCH_MEMCPY32
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/* 32 bytes boundary memory copy */
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memcpy32(buf, base, pagesize);
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#else
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for (offset = 0; offset < (pagesize >> 2); offset++) {
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value = *(base + offset);
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*p++ = value;
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}
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#endif
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return 0;
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}
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#ifndef CONFIG_ONENAND_START_PAGE
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#define CONFIG_ONENAND_START_PAGE 1
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#endif
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#define ONENAND_PAGES_PER_BLOCK 64
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static void onenand_generic_init(int *page_is_4KiB, int *page)
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{
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int dev_id, density;
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if (onenand_readw(ONENAND_REG_TECHNOLOGY))
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*page_is_4KiB = 1;
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dev_id = onenand_readw(ONENAND_REG_DEVICE_ID);
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density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
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density &= ONENAND_DEVICE_DENSITY_MASK;
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if (density >= ONENAND_DEVICE_DENSITY_4Gb &&
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!(dev_id & ONENAND_DEVICE_IS_DDP))
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*page_is_4KiB = 1;
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}
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/**
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* onenand_read_block - Read CONFIG_SYS_MONITOR_LEN from begining
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* of OneNAND, skipping bad blocks
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* @return 0 on success
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*/
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int onenand_read_block(unsigned char *buf)
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{
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int block, nblocks;
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int page = CONFIG_ONENAND_START_PAGE, offset = 0;
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int pagesize, erasesize, erase_shift;
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int page_is_4KiB = 0;
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onenand_read_page = generic_onenand_read_page;
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onenand_generic_init(&page_is_4KiB, &page);
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if (page_is_4KiB) {
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pagesize = 4096; /* OneNAND has 4KiB pagesize */
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erase_shift = 18;
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} else {
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pagesize = 2048; /* OneNAND has 2KiB pagesize */
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erase_shift = 17;
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}
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erasesize = (1 << erase_shift);
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nblocks = (CONFIG_SYS_MONITOR_LEN + erasesize - 1) >> erase_shift;
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/* NOTE: you must read page from page 1 of block 0 */
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/* read the block page by page */
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for (block = 0; block < nblocks; block++) {
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for (; page < ONENAND_PAGES_PER_BLOCK; page++) {
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if (onenand_read_page(block, page, buf + offset,
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pagesize)) {
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/* This block is bad. Skip it
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* and read next block */
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offset -= page * pagesize;
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nblocks++;
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break;
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}
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offset += pagesize;
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}
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page = 0;
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}
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return 0;
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}
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