diff options
Diffstat (limited to 'nand_spl/nand_boot.c')
| -rw-r--r-- | nand_spl/nand_boot.c | 64 |
1 files changed, 63 insertions, 1 deletions
diff --git a/nand_spl/nand_boot.c b/nand_spl/nand_boot.c index e2147cb..bc57725 100644 --- a/nand_spl/nand_boot.c +++ b/nand_spl/nand_boot.c @@ -1,5 +1,5 @@ /* - * (C) Copyright 2006-2007 + * (C) Copyright 2006-2008 * Stefan Roese, DENX Software Engineering, sr@denx.de. * * This program is free software; you can redistribute it and/or @@ -28,6 +28,10 @@ static int nand_ecc_pos[] = CFG_NAND_ECCPOS; extern void board_nand_init(struct nand_chip *nand); +#if (CFG_NAND_PAGE_SIZE <= 512) +/* + * NAND command for small page NAND devices (512) + */ static int nand_command(struct mtd_info *mtd, int block, int page, int offs, u8 cmd) { struct nand_chip *this = mtd->priv; @@ -65,6 +69,64 @@ static int nand_command(struct mtd_info *mtd, int block, int page, int offs, u8 return 0; } +#else +/* + * NAND command for large page NAND devices (2k) + */ +static int nand_command(struct mtd_info *mtd, int block, int page, int offs, u8 cmd) +{ + struct nand_chip *this = mtd->priv; + int page_offs = offs; + int page_addr = page + block * CFG_NAND_PAGE_COUNT; + + if (this->dev_ready) + this->dev_ready(mtd); + else + CFG_NAND_READ_DELAY; + + /* Emulate NAND_CMD_READOOB */ + if (cmd == NAND_CMD_READOOB) { + page_offs += CFG_NAND_PAGE_SIZE; + cmd = NAND_CMD_READ0; + } + + /* Begin command latch cycle */ + this->hwcontrol(mtd, NAND_CTL_SETCLE); + this->write_byte(mtd, cmd); + /* 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, page_offs & 0xff); /* A[7:0] */ + this->write_byte(mtd, (uchar)((page_offs >> 8) & 0xff)); /* A[11:9] */ + /* Row address */ + this->write_byte(mtd, (uchar)(page_addr & 0xff)); /* A[19:12] */ + this->write_byte(mtd, (uchar)((page_addr >> 8) & 0xff)); /* A[27:20] */ +#ifdef CFG_NAND_5_ADDR_CYCLE + /* One more address cycle for devices > 128MiB */ + this->write_byte(mtd, (uchar)((page_addr >> 16) & 0x0f)); /* A[xx:28] */ +#endif + /* Latch in address */ + this->hwcontrol(mtd, NAND_CTL_CLRALE); + + /* Begin command latch cycle */ + this->hwcontrol(mtd, NAND_CTL_SETCLE); + /* Write out the start read command */ + this->write_byte(mtd, NAND_CMD_READSTART); + /* End command latch cycle */ + this->hwcontrol(mtd, NAND_CTL_CLRCLE); + + /* + * Wait a while for the data to be ready + */ + if (this->dev_ready) + this->dev_ready(mtd); + else + CFG_NAND_READ_DELAY; + + return 0; +} +#endif static int nand_is_bad_block(struct mtd_info *mtd, int block) { |