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/*
* (C) Copyright 2005-2008 Samsung Electronis
* Kyungmin Park <kyungmin.park@samsung.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <asm/io.h>
#include <asm/string.h>
#include "onenand_ipl.h"
#define onenand_block_address(block) (block)
#define onenand_sector_address(page) (page << 2)
#define onenand_buffer_address() ((1 << 3) << 8)
#define onenand_bufferram_address(block) (0)
#ifdef __HAVE_ARCH_MEMCPY32
extern void *memcpy32(void *dest, void *src, int size);
#endif
/* read a page with ECC */
static inline int onenand_read_page(ulong block, ulong page,
u_char * buf, int pagesize)
{
unsigned long *base;
#ifndef __HAVE_ARCH_MEMCPY32
unsigned int offset, value;
unsigned long *p;
#endif
onenand_writew(onenand_block_address(block),
THIS_ONENAND(ONENAND_REG_START_ADDRESS1));
onenand_writew(onenand_bufferram_address(block),
THIS_ONENAND(ONENAND_REG_START_ADDRESS2));
onenand_writew(onenand_sector_address(page),
THIS_ONENAND(ONENAND_REG_START_ADDRESS8));
onenand_writew(onenand_buffer_address(),
THIS_ONENAND(ONENAND_REG_START_BUFFER));
onenand_writew(ONENAND_INT_CLEAR, THIS_ONENAND(ONENAND_REG_INTERRUPT));
onenand_writew(ONENAND_CMD_READ, THIS_ONENAND(ONENAND_REG_COMMAND));
#ifndef __HAVE_ARCH_MEMCPY32
p = (unsigned long *) buf;
#endif
base = (unsigned long *) (CONFIG_SYS_ONENAND_BASE + ONENAND_DATARAM);
while (!(READ_INTERRUPT() & ONENAND_INT_READ))
continue;
#ifdef __HAVE_ARCH_MEMCPY32
/* 32 bytes boundary memory copy */
memcpy32(buf, base, pagesize);
#else
for (offset = 0; offset < (pagesize >> 2); offset++) {
value = *(base + offset);
*p++ = value;
}
#endif
return 0;
}
#define ONENAND_START_PAGE 1
#define ONENAND_PAGES_PER_BLOCK 64
/**
* onenand_read_block - Read a block data to buf
* @return 0 on success
*/
int onenand_read_block0(unsigned char *buf)
{
int page, offset = 0;
int pagesize = ONENAND_PAGE_SIZE;
/* MLC OneNAND has 4KiB page size */
if (onenand_readw(THIS_ONENAND(ONENAND_REG_TECHNOLOGY)))
pagesize <<= 1;
/* NOTE: you must read page from page 1 of block 0 */
/* read the block page by page*/
for (page = ONENAND_START_PAGE;
page < ONENAND_PAGES_PER_BLOCK; page++) {
onenand_read_page(0, page, buf + offset, pagesize);
offset += pagesize;
}
return 0;
}
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