From 54cd51bf7910164e6640c7f428f2fd95e15019da Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Mon, 31 Oct 2011 14:14:15 +0100 Subject: OneNAND: Add simple OneNAND SPL This introduces small OneNAND loader, fitting into 1kB of space (smallest possible OneNAND RAM size). Some devices equipped with such crappy chips will use this. Signed-off-by: Marek Vasut Cc: Albert ARIBAUD Cc: Kyungmin Park Cc: Scott Wood V2: Introduce spl_onenand_load_image() to load data from OneNAND in SPL V3: Cleanup, align with nand_spl. Skip whole blocks. --- drivers/mtd/onenand/Makefile | 4 ++ drivers/mtd/onenand/onenand_spl.c | 146 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 150 insertions(+) create mode 100644 drivers/mtd/onenand/onenand_spl.c (limited to 'drivers/mtd') diff --git a/drivers/mtd/onenand/Makefile b/drivers/mtd/onenand/Makefile index b984bd4..b090d40 100644 --- a/drivers/mtd/onenand/Makefile +++ b/drivers/mtd/onenand/Makefile @@ -25,8 +25,12 @@ include $(TOPDIR)/config.mk LIB := $(obj)libonenand.o +ifndef CONFIG_SPL_BUILD COBJS-$(CONFIG_CMD_ONENAND) := onenand_uboot.o onenand_base.o onenand_bbt.o COBJS-$(CONFIG_SAMSUNG_ONENAND) += samsung.o +else +COBJS-y := onenand_spl.o +endif COBJS := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/mtd/onenand/onenand_spl.c b/drivers/mtd/onenand/onenand_spl.c new file mode 100644 index 0000000..50eaa71 --- /dev/null +++ b/drivers/mtd/onenand/onenand_spl.c @@ -0,0 +1,146 @@ +/* + * Copyright (C) 2011 Marek Vasut + * + * Based on code: + * Copyright (C) 2005-2009 Samsung Electronics + * Kyungmin Park + * + * 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 +#include +#include +#include + +/* + * Device geometry: + * - 2048b page, 128k erase block. + * - 4096b page, 256k erase block. + */ +enum onenand_spl_pagesize { + PAGE_2K = 2048, + PAGE_4K = 4096, +}; + +#define ONENAND_PAGES_PER_BLOCK 64 +#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) + +static inline uint16_t onenand_readw(uint32_t addr) +{ + return readw(CONFIG_SYS_ONENAND_BASE + addr); +} + +static inline void onenand_writew(uint16_t value, uint32_t addr) +{ + writew(value, CONFIG_SYS_ONENAND_BASE + addr); +} + +static enum onenand_spl_pagesize onenand_spl_get_geometry(void) +{ + uint32_t dev_id, density; + + if (!onenand_readw(ONENAND_REG_TECHNOLOGY)) { + 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) + return PAGE_2K; + + if (dev_id & ONENAND_DEVICE_IS_DDP) + return PAGE_2K; + } + + return PAGE_4K; +} + +static int onenand_spl_read_page(uint32_t block, uint32_t page, uint32_t *buf, + enum onenand_spl_pagesize pagesize) +{ + const uint32_t addr = CONFIG_SYS_ONENAND_BASE + ONENAND_DATARAM; + uint32_t offset; + + 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); + + while (!(onenand_readw(ONENAND_REG_INTERRUPT) & ONENAND_INT_READ)) + continue; + + /* Check for invalid block mark */ + if (page < 2 && (onenand_readw(ONENAND_SPARERAM) != 0xffff)) + return 1; + + for (offset = 0; offset < pagesize; offset += 4) + buf[offset / 4] = readl(addr + offset); + + return 0; +} + +void onenand_spl_load_image(uint32_t offs, uint32_t size, void *dst) +{ + uint32_t *addr = (uint32_t *)dst; + uint32_t total_pages; + uint32_t block; + uint32_t page, rpage; + enum onenand_spl_pagesize pagesize; + int ret; + + pagesize = onenand_spl_get_geometry(); + + /* + * The page can be either 2k or 4k, avoid using DIV_ROUND_UP to avoid + * pulling further unwanted functions into the SPL. + */ + if (pagesize == 2048) { + total_pages = DIV_ROUND_UP(size, 2048); + page = offs / 2048; + } else { + total_pages = DIV_ROUND_UP(size, 4096); + page = offs / 4096; + } + + for (; page <= total_pages; page++) { + block = page / ONENAND_PAGES_PER_BLOCK; + rpage = page & (ONENAND_PAGES_PER_BLOCK - 1); + ret = onenand_spl_read_page(block, rpage, addr, pagesize); + if (ret) { + total_pages += ONENAND_PAGES_PER_BLOCK; + page += ONENAND_PAGES_PER_BLOCK - 1; + } else { + addr += pagesize / 4; + } + } +} -- cgit v1.1