mirror of
https://github.com/AsahiLinux/u-boot
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259 lines
6.8 KiB
C
259 lines
6.8 KiB
C
/*
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* (C) Copyright 2006-2008
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* Stefan Roese, DENX Software Engineering, sr@denx.de.
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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 <nand.h>
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#include <asm/io.h>
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#define CONFIG_SYS_NAND_READ_DELAY \
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{ volatile int dummy; int i; for (i=0; i<10000; i++) dummy = i; }
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static int nand_ecc_pos[] = CONFIG_SYS_NAND_ECCPOS;
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extern void board_nand_init(struct nand_chip *nand);
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#if (CONFIG_SYS_NAND_PAGE_SIZE <= 512)
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/*
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* NAND command for small page NAND devices (512)
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*/
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static int nand_command(struct mtd_info *mtd, int block, int page, int offs, u8 cmd)
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{
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struct nand_chip *this = mtd->priv;
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int page_addr = page + block * CONFIG_SYS_NAND_PAGE_COUNT;
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if (this->dev_ready)
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while (!this->dev_ready(mtd))
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;
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else
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CONFIG_SYS_NAND_READ_DELAY;
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/* Begin command latch cycle */
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this->cmd_ctrl(mtd, cmd, NAND_CTRL_CLE | NAND_CTRL_CHANGE);
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/* Set ALE and clear CLE to start address cycle */
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/* Column address */
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this->cmd_ctrl(mtd, offs, NAND_CTRL_ALE | NAND_CTRL_CHANGE);
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this->cmd_ctrl(mtd, page_addr & 0xff, 0); /* A[16:9] */
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this->cmd_ctrl(mtd, (page_addr >> 8) & 0xff, 0); /* A[24:17] */
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#ifdef CONFIG_SYS_NAND_4_ADDR_CYCLE
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/* One more address cycle for devices > 32MiB */
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this->cmd_ctrl(mtd, (page_addr >> 16) & 0x0f, 0); /* A[28:25] */
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#endif
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/* Latch in address */
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this->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
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/*
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* Wait a while for the data to be ready
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*/
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if (this->dev_ready)
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while (!this->dev_ready(mtd))
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;
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else
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CONFIG_SYS_NAND_READ_DELAY;
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return 0;
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}
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#else
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/*
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* NAND command for large page NAND devices (2k)
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*/
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static int nand_command(struct mtd_info *mtd, int block, int page, int offs, u8 cmd)
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{
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struct nand_chip *this = mtd->priv;
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int page_addr = page + block * CONFIG_SYS_NAND_PAGE_COUNT;
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if (this->dev_ready)
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while (!this->dev_ready(mtd))
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;
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else
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CONFIG_SYS_NAND_READ_DELAY;
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/* Emulate NAND_CMD_READOOB */
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if (cmd == NAND_CMD_READOOB) {
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offs += CONFIG_SYS_NAND_PAGE_SIZE;
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cmd = NAND_CMD_READ0;
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}
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/* Begin command latch cycle */
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this->cmd_ctrl(mtd, cmd, NAND_CTRL_CLE | NAND_CTRL_CHANGE);
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/* Set ALE and clear CLE to start address cycle */
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/* Column address */
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this->cmd_ctrl(mtd, offs & 0xff,
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NAND_CTRL_ALE | NAND_CTRL_CHANGE); /* A[7:0] */
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this->cmd_ctrl(mtd, (offs >> 8) & 0xff, 0); /* A[11:9] */
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/* Row address */
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this->cmd_ctrl(mtd, (page_addr & 0xff), 0); /* A[19:12] */
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this->cmd_ctrl(mtd, ((page_addr >> 8) & 0xff), 0); /* A[27:20] */
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#ifdef CONFIG_SYS_NAND_5_ADDR_CYCLE
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/* One more address cycle for devices > 128MiB */
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this->cmd_ctrl(mtd, (page_addr >> 16) & 0x0f, 0); /* A[31:28] */
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#endif
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/* Latch in address */
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this->cmd_ctrl(mtd, NAND_CMD_READSTART,
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NAND_CTRL_CLE | NAND_CTRL_CHANGE);
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this->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
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/*
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* Wait a while for the data to be ready
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*/
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if (this->dev_ready)
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while (!this->dev_ready(mtd))
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;
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else
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CONFIG_SYS_NAND_READ_DELAY;
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return 0;
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}
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#endif
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static int nand_is_bad_block(struct mtd_info *mtd, int block)
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{
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struct nand_chip *this = mtd->priv;
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nand_command(mtd, block, 0, CONFIG_SYS_NAND_BAD_BLOCK_POS, NAND_CMD_READOOB);
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/*
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* Read one byte
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*/
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if (readb(this->IO_ADDR_R) != 0xff)
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return 1;
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return 0;
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}
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static int nand_read_page(struct mtd_info *mtd, int block, int page, uchar *dst)
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{
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struct nand_chip *this = mtd->priv;
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u_char *ecc_calc;
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u_char *ecc_code;
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u_char *oob_data;
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int i;
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int eccsize = CONFIG_SYS_NAND_ECCSIZE;
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int eccbytes = CONFIG_SYS_NAND_ECCBYTES;
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int eccsteps = CONFIG_SYS_NAND_ECCSTEPS;
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uint8_t *p = dst;
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int stat;
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nand_command(mtd, block, page, 0, NAND_CMD_READ0);
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/* No malloc available for now, just use some temporary locations
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* in SDRAM
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*/
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ecc_calc = (u_char *)(CONFIG_SYS_SDRAM_BASE + 0x10000);
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ecc_code = ecc_calc + 0x100;
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oob_data = ecc_calc + 0x200;
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for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
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this->ecc.hwctl(mtd, NAND_ECC_READ);
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this->read_buf(mtd, p, eccsize);
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this->ecc.calculate(mtd, p, &ecc_calc[i]);
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}
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this->read_buf(mtd, oob_data, CONFIG_SYS_NAND_OOBSIZE);
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/* Pick the ECC bytes out of the oob data */
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for (i = 0; i < CONFIG_SYS_NAND_ECCTOTAL; i++)
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ecc_code[i] = oob_data[nand_ecc_pos[i]];
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eccsteps = CONFIG_SYS_NAND_ECCSTEPS;
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p = dst;
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for (i = 0 ; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
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/* No chance to do something with the possible error message
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* from correct_data(). We just hope that all possible errors
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* are corrected by this routine.
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*/
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stat = this->ecc.correct(mtd, p, &ecc_code[i], &ecc_calc[i]);
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}
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return 0;
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}
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static int nand_load(struct mtd_info *mtd, unsigned int offs,
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unsigned int uboot_size, uchar *dst)
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{
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unsigned int block, lastblock;
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unsigned int page;
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/*
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* offs has to be aligned to a page address!
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*/
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block = offs / CONFIG_SYS_NAND_BLOCK_SIZE;
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lastblock = (offs + uboot_size - 1) / CONFIG_SYS_NAND_BLOCK_SIZE;
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page = (offs % CONFIG_SYS_NAND_BLOCK_SIZE) / CONFIG_SYS_NAND_PAGE_SIZE;
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while (block <= lastblock) {
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if (!nand_is_bad_block(mtd, block)) {
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/*
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* Skip bad blocks
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*/
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while (page < CONFIG_SYS_NAND_PAGE_COUNT) {
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nand_read_page(mtd, block, page, dst);
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dst += CONFIG_SYS_NAND_PAGE_SIZE;
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page++;
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}
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page = 0;
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} else {
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lastblock++;
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}
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block++;
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}
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return 0;
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}
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/*
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* The main entry for NAND booting. It's necessary that SDRAM is already
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* configured and available since this code loads the main U-Boot image
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* from NAND into SDRAM and starts it from there.
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*/
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void nand_boot(void)
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{
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struct nand_chip nand_chip;
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nand_info_t nand_info;
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int ret;
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__attribute__((noreturn)) void (*uboot)(void);
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/*
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* Init board specific nand support
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*/
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nand_info.priv = &nand_chip;
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nand_chip.IO_ADDR_R = nand_chip.IO_ADDR_W = (void __iomem *)CONFIG_SYS_NAND_BASE;
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nand_chip.dev_ready = NULL; /* preset to NULL */
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board_nand_init(&nand_chip);
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if (nand_chip.select_chip)
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nand_chip.select_chip(&nand_info, 0);
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/*
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* Load U-Boot image from NAND into RAM
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*/
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ret = nand_load(&nand_info, CONFIG_SYS_NAND_U_BOOT_OFFS, CONFIG_SYS_NAND_U_BOOT_SIZE,
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(uchar *)CONFIG_SYS_NAND_U_BOOT_DST);
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if (nand_chip.select_chip)
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nand_chip.select_chip(&nand_info, -1);
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/*
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* Jump to U-Boot image
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*/
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uboot = (void *)CONFIG_SYS_NAND_U_BOOT_START;
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(*uboot)();
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}
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