/* * (C) Copyright 2005-2009 Samsung Electronics * 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 int (*onenand_read_page)(ulong block, ulong page, u_char *buf, int pagesize); /* read a page with ECC */ static int generic_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), ONENAND_REG_START_ADDRESS1); onenand_writew(onenand_bufferram_address(block), ONENAND_REG_START_ADDRESS2); onenand_writew(onenand_sector_address(page), ONENAND_REG_START_ADDRESS8); onenand_writew(onenand_buffer_address(), ONENAND_REG_START_BUFFER); onenand_writew(ONENAND_INT_CLEAR, ONENAND_REG_INTERRUPT); onenand_writew(ONENAND_CMD_READ, 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; /* Check for invalid block mark */ if (page < 2 && (onenand_readw(ONENAND_SPARERAM) != 0xffff)) return 1; #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; } #ifndef CONFIG_ONENAND_START_PAGE #define CONFIG_ONENAND_START_PAGE 1 #endif #define ONENAND_PAGES_PER_BLOCK 64 static void onenand_generic_init(int *page_is_4KiB, int *page) { int dev_id, density; if (onenand_readw(ONENAND_REG_TECHNOLOGY)) *page_is_4KiB = 1; dev_id = onenand_readw(ONENAND_REG_DEVICE_ID); density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT; density &= ONENAND_DEVICE_DENSITY_MASK; if (density >= ONENAND_DEVICE_DENSITY_4Gb && !(dev_id & ONENAND_DEVICE_IS_DDP)) *page_is_4KiB = 1; } /** * onenand_read_block - Read CONFIG_SYS_MONITOR_LEN from begining * of OneNAND, skipping bad blocks * @return 0 on success */ int onenand_read_block(unsigned char *buf) { int block, nblocks; int page = CONFIG_ONENAND_START_PAGE, offset = 0; int pagesize, erasesize, erase_shift; int page_is_4KiB = 0; onenand_read_page = generic_onenand_read_page; onenand_generic_init(&page_is_4KiB, &page); if (page_is_4KiB) { pagesize = 4096; /* OneNAND has 4KiB pagesize */ erase_shift = 18; } else { pagesize = 2048; /* OneNAND has 2KiB pagesize */ erase_shift = 17; } erasesize = (1 << erase_shift); nblocks = (CONFIG_SYS_MONITOR_LEN + erasesize - 1) >> erase_shift; /* NOTE: you must read page from page 1 of block 0 */ /* read the block page by page */ for (block = 0; block < nblocks; block++) { for (; page < ONENAND_PAGES_PER_BLOCK; page++) { if (onenand_read_page(block, page, buf + offset, pagesize)) { /* This block is bad. Skip it * and read next block */ offset -= page * pagesize; nblocks++; break; } offset += pagesize; } page = 0; } return 0; }