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nand_spl: Update nand_spl to support 2k page size NAND devices 

This patch adds support for booting from 2k page sized NAND device
(e.g. Micron 29F2G08AAC).

Tested on AMCC Canyonlands.

Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Stefan Roese 2008-04-08 10:31:00 +02:00
parent 5e3dca577b
commit 46f373838e
1 changed files with 63 additions and 1 deletions
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64
nand_spl/nand_boot.c
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@ -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)
{