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/*
* drivers/mtd/nand.c
*
* Overview:
* This is the generic MTD driver for NAND flash devices. It should be
* capable of working with almost all NAND chips currently available.
* Basic support for AG-AND chips is provided.
* Additional technical information is available on
* http://www.linux-mtd.infradead.org/tech/nand.html
* Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
* 2002 Thomas Gleixner (tglx@linutronix.de)
*
* 02-08-2004 tglx: support for strange chips, which cannot auto increment
* pages on read / read_oob
*
* 03-17-2004 tglx: Check ready before auto increment check. Simon Bayes
* pointed this out, as he marked an auto increment capable chip
* as NOAUTOINCR in the board driver.
* Make reads over block boundaries work too
*
* 04-14-2004 tglx: first working version for 2k page size chips
* 05-19-2004 tglx: Basic support for Renesas AG-AND chips
*
* 09-24-2004 tglx: add support for hardware controllers (e.g. ECC) shared
* among multiple independend devices. Suggestions and initial patch
* from Ben Dooks <ben-mtd@fluff.org>
*
* Credits:
* David Woodhouse for adding multichip support
*
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* Aleph One Ltd. and Toby Churchill Ltd. for supporting the
* rework for 2K page size chips
*
* TODO:
* Enable cached programming for 2k page size chips
* Check, if mtd->ecctype should be set to MTD_ECC_HW
* if we have HW ecc support.
* The AG-AND chips have nice features for speed improvement,
* which are not supported yet. Read / program 4 pages in one go.
*
* $Id: nand_base.c,v 1.126 2004/12/13 11:22:25 lavinen Exp $
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
/* XXX U-BOOT XXX */
#if 0
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/mtd/compatmac.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <asm/io.h>
#ifdef CONFIG_MTD_PARTITIONS
#include <linux/mtd/partitions.h>
#endif
#include <common.h>
Bartlomiej Sieka
committed
#if ((CONFIG_COMMANDS & CFG_CMD_NAND) || defined(CONFIG_CMD_NAND)) && !defined(CFG_NAND_LEGACY)
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#include <malloc.h>
#include <watchdog.h>
#include <linux/mtd/compat.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/nand_ecc.h>
#include <asm/io.h>
#include <asm/errno.h>
#ifdef CONFIG_JFFS2_NAND
#include <jffs2/jffs2.h>
#endif
/* Define default oob placement schemes for large and small page devices */
static struct nand_oobinfo nand_oob_8 = {
.useecc = MTD_NANDECC_AUTOPLACE,
.eccbytes = 3,
.eccpos = {0, 1, 2},
.oobfree = { {3, 2}, {6, 2} }
};
static struct nand_oobinfo nand_oob_16 = {
.useecc = MTD_NANDECC_AUTOPLACE,
.eccbytes = 6,
.eccpos = {0, 1, 2, 3, 6, 7},
.oobfree = { {8, 8} }
};
static struct nand_oobinfo nand_oob_64 = {
.useecc = MTD_NANDECC_AUTOPLACE,
.eccbytes = 24,
.eccpos = {
40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55,
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.oobfree = { {2, 38} }
};
/* This is used for padding purposes in nand_write_oob */
static u_char ffchars[] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
};
/*
* NAND low-level MTD interface functions
*/
static void nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len);
static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len);
static int nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len);
static int nand_read (struct mtd_info *mtd, loff_t from, size_t len, size_t * retlen, u_char * buf);
static int nand_read_ecc (struct mtd_info *mtd, loff_t from, size_t len,
size_t * retlen, u_char * buf, u_char * eccbuf, struct nand_oobinfo *oobsel);
static int nand_read_oob (struct mtd_info *mtd, loff_t from, size_t len, size_t * retlen, u_char * buf);
static int nand_write (struct mtd_info *mtd, loff_t to, size_t len, size_t * retlen, const u_char * buf);
static int nand_write_ecc (struct mtd_info *mtd, loff_t to, size_t len,
size_t * retlen, const u_char * buf, u_char * eccbuf, struct nand_oobinfo *oobsel);
static int nand_write_oob (struct mtd_info *mtd, loff_t to, size_t len, size_t * retlen, const u_char *buf);
/* XXX U-BOOT XXX */
#if 0
static int nand_writev (struct mtd_info *mtd, const struct kvec *vecs,
unsigned long count, loff_t to, size_t * retlen);
static int nand_writev_ecc (struct mtd_info *mtd, const struct kvec *vecs,
unsigned long count, loff_t to, size_t * retlen, u_char *eccbuf, struct nand_oobinfo *oobsel);
#endif
static int nand_erase (struct mtd_info *mtd, struct erase_info *instr);
static void nand_sync (struct mtd_info *mtd);
/* Some internal functions */
static int nand_write_page (struct mtd_info *mtd, struct nand_chip *this, int page, u_char *oob_buf,
struct nand_oobinfo *oobsel, int mode);
#ifdef CONFIG_MTD_NAND_VERIFY_WRITE
static int nand_verify_pages (struct mtd_info *mtd, struct nand_chip *this, int page, int numpages,
u_char *oob_buf, struct nand_oobinfo *oobsel, int chipnr, int oobmode);
#else
#define nand_verify_pages(...) (0)
#endif
static void nand_get_device (struct nand_chip *this, struct mtd_info *mtd, int new_state);
/**
* nand_release_device - [GENERIC] release chip
* @mtd: MTD device structure
*
* Deselect, release chip lock and wake up anyone waiting on the device
*/
/* XXX U-BOOT XXX */
#if 0
static void nand_release_device (struct mtd_info *mtd)
{
struct nand_chip *this = mtd->priv;
/* De-select the NAND device */
this->select_chip(mtd, -1);
/* Do we have a hardware controller ? */
if (this->controller) {
spin_lock(&this->controller->lock);
this->controller->active = NULL;
spin_unlock(&this->controller->lock);
}
/* Release the chip */
spin_lock (&this->chip_lock);
this->state = FL_READY;
wake_up (&this->wq);
spin_unlock (&this->chip_lock);
}
#else
static void nand_release_device (struct mtd_info *mtd)
{
struct nand_chip *this = mtd->priv;
this->select_chip(mtd, -1); /* De-select the NAND device */
}
#endif
/**
* nand_read_byte - [DEFAULT] read one byte from the chip
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