diff options
Diffstat (limited to 'nand_spl/nand_boot.c')
| -rw-r--r-- | nand_spl/nand_boot.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/nand_spl/nand_boot.c b/nand_spl/nand_boot.c new file mode 100644 index 0000000..21abb09 --- /dev/null +++ b/nand_spl/nand_boot.c @@ -0,0 +1,177 @@ +/* + * (C) Copyright 2006 + * Stefan Roese, DENX Software Engineering, sr@denx.de. + * + * 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 <nand.h> + +#define CFG_NAND_READ_DELAY \ + { volatile int dummy; int i; for (i=0; i<10000; i++) dummy = i; } + +extern void board_nand_init(struct nand_chip *nand); +extern void ndfc_hwcontrol(struct mtd_info *mtdinfo, int cmd); +extern void ndfc_write_byte(struct mtd_info *mtdinfo, u_char byte); +extern u_char ndfc_read_byte(struct mtd_info *mtdinfo); +extern int ndfc_dev_ready(struct mtd_info *mtdinfo); +extern int jump_to_ram(ulong delta); +extern int jump_to_uboot(ulong addr); + +static int nand_is_bad_block(struct mtd_info *mtd, int block) +{ + struct nand_chip *this = mtd->priv; + int page_addr = block * CFG_NAND_PAGE_COUNT; + + /* Begin command latch cycle */ + this->hwcontrol(mtd, NAND_CTL_SETCLE); + this->write_byte(mtd, NAND_CMD_READOOB); + /* Set ALE and clear CLE to start address cycle */ + this->hwcontrol(mtd, NAND_CTL_CLRCLE); + this->hwcontrol(mtd, NAND_CTL_SETALE); + /* Column address */ + this->write_byte(mtd, CFG_NAND_BAD_BLOCK_POS); /* A[7:0] */ + this->write_byte(mtd, (uchar)(page_addr & 0xff)); /* A[16:9] */ + this->write_byte(mtd, (uchar)((page_addr >> 8) & 0xff)); /* A[24:17] */ +#ifdef CFG_NAND_4_ADDR_CYCLE + /* One more address cycle for devices > 32MiB */ + this->write_byte(mtd, (uchar)((page_addr >> 16) & 0x0f)); /* A[xx:25] */ +#endif + /* Latch in address */ + this->hwcontrol(mtd, NAND_CTL_CLRALE); + + /* + * Wait a while for the data to be ready + */ + if (this->dev_ready) + this->dev_ready(mtd); + else + CFG_NAND_READ_DELAY; + + /* + * Read on byte + */ + if (this->read_byte(mtd) != 0xff) + return 1; + + return 0; +} + +static int nand_read_page(struct mtd_info *mtd, int block, int page, uchar *dst) +{ + struct nand_chip *this = mtd->priv; + int page_addr = page + block * CFG_NAND_PAGE_COUNT; + int i; + + /* Begin command latch cycle */ + this->hwcontrol(mtd, NAND_CTL_SETCLE); + this->write_byte(mtd, NAND_CMD_READ0); + /* Set ALE and clear CLE to start address cycle */ + this->hwcontrol(mtd, NAND_CTL_CLRCLE); + this->hwcontrol(mtd, NAND_CTL_SETALE); + /* Column address */ + this->write_byte(mtd, 0); /* A[7:0] */ + this->write_byte(mtd, (uchar)(page_addr & 0xff)); /* A[16:9] */ + this->write_byte(mtd, (uchar)((page_addr >> 8) & 0xff)); /* A[24:17] */ +#ifdef CFG_NAND_4_ADDR_CYCLE + /* One more address cycle for devices > 32MiB */ + this->write_byte(mtd, (uchar)((page_addr >> 16) & 0x0f)); /* A[xx:25] */ +#endif + /* Latch in address */ + this->hwcontrol(mtd, NAND_CTL_CLRALE); + + /* + * Wait a while for the data to be ready + */ + if (this->dev_ready) + this->dev_ready(mtd); + else + CFG_NAND_READ_DELAY; + + /* + * Read page into buffer + */ + for (i=0; i<CFG_NAND_PAGE_SIZE; i++) + *dst++ = this->read_byte(mtd); + + return 0; +} + +static int nand_load(struct mtd_info *mtd, int offs, int uboot_size, uchar *dst) +{ + int block; + int blockcopy_count; + int page; + + /* + * offs has to be aligned to a block address! + */ + block = offs / CFG_NAND_BLOCK_SIZE; + blockcopy_count = 0; + + while (blockcopy_count < (uboot_size / CFG_NAND_BLOCK_SIZE)) { + if (!nand_is_bad_block(mtd, block)) { + /* + * Skip bad blocks + */ + for (page = 0; page < CFG_NAND_PAGE_COUNT; page++) { + nand_read_page(mtd, block, page, dst); + dst += CFG_NAND_PAGE_SIZE; + } + + blockcopy_count++; + } + + block++; + } + + return 0; +} + +void nand_boot(void) +{ + ulong mem_size; + struct nand_chip nand_chip; + nand_info_t nand_info; + int ret; + void (*uboot)(void); + + /* + * Init sdram, so we have access to memory + */ + mem_size = initdram(0); + + /* + * Init board specific nand support + */ + nand_info.priv = &nand_chip; + nand_chip.IO_ADDR_R = nand_chip.IO_ADDR_W = (void __iomem *)CFG_NAND_BASE; + nand_chip.dev_ready = NULL; /* preset to NULL */ + board_nand_init(&nand_chip); + + /* + * Load U-Boot image from NAND into RAM + */ + ret = nand_load(&nand_info, CFG_NAND_U_BOOT_OFFS, CFG_NAND_U_BOOT_SIZE, + (uchar *)CFG_NAND_U_BOOT_DST); + + /* + * Jump to U-Boot image + */ + uboot = (void (*)(void))CFG_NAND_U_BOOT_START; + (*uboot)(); +} |