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linux/drivers/mtd/nand/nand_base.c

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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)
* 2002-2006 Thomas Gleixner (tglx@linutronix.de)
*
* Credits:
* David Woodhouse for adding multichip support
*
* 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.
*
* 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.
*
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/err.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 <linux/leds.h>
#include <asm/io.h>
#ifdef CONFIG_MTD_PARTITIONS
#include <linux/mtd/partitions.h>
#endif
/* Define default oob placement schemes for large and small page devices */
static struct nand_ecclayout nand_oob_8 = {
.eccbytes = 3,
.eccpos = {0, 1, 2},
.oobfree = {
{.offset = 3,
.length = 2},
{.offset = 6,
.length = 2}}
};
static struct nand_ecclayout nand_oob_16 = {
.eccbytes = 6,
.eccpos = {0, 1, 2, 3, 6, 7},
.oobfree = {
{.offset = 8,
. length = 8}}
};
static struct nand_ecclayout nand_oob_64 = {
.eccbytes = 24,
.eccpos = {
40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55,
56, 57, 58, 59, 60, 61, 62, 63},
.oobfree = {
{.offset = 2,
.length = 38}}
};
static int nand_get_device(struct nand_chip *chip, struct mtd_info *mtd,
int new_state);
static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
struct mtd_oob_ops *ops);
/*
* For devices which display every fart in the system on a seperate LED. Is
* compiled away when LED support is disabled.
*/
DEFINE_LED_TRIGGER(nand_led_trigger);
/**
* nand_release_device - [GENERIC] release chip
* @mtd: MTD device structure
*
* Deselect, release chip lock and wake up anyone waiting on the device
*/
static void nand_release_device(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd->priv;
/* De-select the NAND device */
chip->select_chip(mtd, -1);
/* Release the controller and the chip */
spin_lock(&chip->controller->lock);
chip->controller->active = NULL;
chip->state = FL_READY;
wake_up(&chip->controller->wq);
spin_unlock(&chip->controller->lock);
}
/**
* nand_read_byte - [DEFAULT] read one byte from the chip
* @mtd: MTD device structure
*
* Default read function for 8bit buswith
*/
static uint8_t nand_read_byte(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd->priv;
return readb(chip->IO_ADDR_R);
}
/**
* nand_read_byte16 - [DEFAULT] read one byte endianess aware from the chip
* @mtd: MTD device structure
*
* Default read function for 16bit buswith with
* endianess conversion
*/
static uint8_t nand_read_byte16(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd->priv;
return (uint8_t) cpu_to_le16(readw(chip->IO_ADDR_R));
}
/**
* nand_read_word - [DEFAULT] read one word from the chip
* @mtd: MTD device structure
*
* Default read function for 16bit buswith without
* endianess conversion
*/
static u16 nand_read_word(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd->priv;
return readw(chip->IO_ADDR_R);
}
/**
* nand_select_chip - [DEFAULT] control CE line
* @mtd: MTD device structure
* @chipnr: chipnumber to select, -1 for deselect
*
* Default select function for 1 chip devices.
*/
static void nand_select_chip(struct mtd_info *mtd, int chipnr)
{
struct nand_chip *chip = mtd->priv;
switch (chipnr) {
case -1:
chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE);
break;
case 0:
break;
default:
BUG();
}
}
/**
* nand_write_buf - [DEFAULT] write buffer to chip
* @mtd: MTD device structure
* @buf: data buffer
* @len: number of bytes to write
*
* Default write function for 8bit buswith
*/
static void nand_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
{
int i;
struct nand_chip *chip = mtd->priv;
for (i = 0; i < len; i++)
writeb(buf[i], chip->IO_ADDR_W);
}
/**
* nand_read_buf - [DEFAULT] read chip data into buffer
* @mtd: MTD device structure
* @buf: buffer to store date
* @len: number of bytes to read
*
* Default read function for 8bit buswith
*/
static void nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
{
int i;
struct nand_chip *chip = mtd->priv;
for (i = 0; i < len; i++)
buf[i] = readb(chip->IO_ADDR_R);
}
/**
* nand_verify_buf - [DEFAULT] Verify chip data against buffer
* @mtd: MTD device structure
* @buf: buffer containing the data to compare
* @len: number of bytes to compare
*
* Default verify function for 8bit buswith
*/
static int nand_verify_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
{
int i;
struct nand_chip *chip = mtd->priv;
for (i = 0; i < len; i++)
if (buf[i] != readb(chip->IO_ADDR_R))
return -EFAULT;
return 0;
}
/**
* nand_write_buf16 - [DEFAULT] write buffer to chip
* @mtd: MTD device structure
* @buf: data buffer
* @len: number of bytes to write
*
* Default write function for 16bit buswith
*/
static void nand_write_buf16(struct mtd_info *mtd, const uint8_t *buf, int len)
{
int i;
struct nand_chip *chip = mtd->priv;
u16 *p = (u16 *) buf;
len >>= 1;
for (i = 0; i < len; i++)
writew(p[i], chip->IO_ADDR_W);
}
/**
* nand_read_buf16 - [DEFAULT] read chip data into buffer
* @mtd: MTD device structure
* @buf: buffer to store date
* @len: number of bytes to read
*
* Default read function for 16bit buswith
*/
static void nand_read_buf16(struct mtd_info *mtd, uint8_t *buf, int len)
{
int i;
struct nand_chip *chip = mtd->priv;
u16 *p = (u16 *) buf;
len >>= 1;
for (i = 0; i < len; i++)
p[i] = readw(chip->IO_ADDR_R);
}
/**
* nand_verify_buf16 - [DEFAULT] Verify chip data against buffer
* @mtd: MTD device structure
* @buf: buffer containing the data to compare
* @len: number of bytes to compare
*
* Default verify function for 16bit buswith
*/
static int nand_verify_buf16(struct mtd_info *mtd, const uint8_t *buf, int len)
{
int i;
struct nand_chip *chip = mtd->priv;
u16 *p = (u16 *) buf;
len >>= 1;
for (i = 0; i < len; i++)
if (p[i] != readw(chip->IO_ADDR_R))
return -EFAULT;
return 0;
}
/**
* nand_block_bad - [DEFAULT] Read bad block marker from the chip
* @mtd: MTD device structure
* @ofs: offset from device start
* @getchip: 0, if the chip is already selected
*
* Check, if the block is bad.
*/
static int nand_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip)
{
int page, chipnr, res = 0;
struct nand_chip *chip = mtd->priv;
u16 bad;
if (getchip) {
page = (int)(ofs >> chip->page_shift);
chipnr = (int)(ofs >> chip->chip_shift);
nand_get_device(chip, mtd, FL_READING);
/* Select the NAND device */
chip->select_chip(mtd, chipnr);
} else
page = (int)ofs;
if (chip->options & NAND_BUSWIDTH_16) {
chip->cmdfunc(mtd, NAND_CMD_READOOB, chip->badblockpos & 0xFE,
page & chip->pagemask);
bad = cpu_to_le16(chip->read_word(mtd));
if (chip->badblockpos & 0x1)
bad >>= 8;
if ((bad & 0xFF) != 0xff)
res = 1;
} else {
chip->cmdfunc(mtd, NAND_CMD_READOOB, chip->badblockpos,
page & chip->pagemask);
if (chip->read_byte(mtd) != 0xff)
res = 1;
}
if (getchip)
nand_release_device(mtd);
return res;
}
/**
* nand_default_block_markbad - [DEFAULT] mark a block bad
* @mtd: MTD device structure
* @ofs: offset from device start
*
* This is the default implementation, which can be overridden by
* a hardware specific driver.
*/
static int nand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
{
struct nand_chip *chip = mtd->priv;
uint8_t buf[2] = { 0, 0 };
int block, ret;
/* Get block number */
block = ((int)ofs) >> chip->bbt_erase_shift;
if (chip->bbt)
chip->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
/* Do we have a flash based bad block table ? */
if (chip->options & NAND_USE_FLASH_BBT)
ret = nand_update_bbt(mtd, ofs);
else {
/* We write two bytes, so we dont have to mess with 16 bit
* access
*/
ofs += mtd->oobsize;
chip->ops.len = 2;
chip->ops.datbuf = NULL;
chip->ops.oobbuf = buf;
chip->ops.ooboffs = chip->badblockpos & ~0x01;
ret = nand_do_write_oob(mtd, ofs, &chip->ops);
}
if (!ret)
mtd->ecc_stats.badblocks++;
return ret;
}
/**
* nand_check_wp - [GENERIC] check if the chip is write protected
* @mtd: MTD device structure
* Check, if the device is write protected
*
* The function expects, that the device is already selected
*/
static int nand_check_wp(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd->priv;
/* Check the WP bit */
chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
return (chip->read_byte(mtd) & NAND_STATUS_WP) ? 0 : 1;
}
/**
* nand_block_checkbad - [GENERIC] Check if a block is marked bad
* @mtd: MTD device structure
* @ofs: offset from device start
* @getchip: 0, if the chip is already selected
* @allowbbt: 1, if its allowed to access the bbt area
*
* Check, if the block is bad. Either by reading the bad block table or
* calling of the scan function.
*/
static int nand_block_checkbad(struct mtd_info *mtd, loff_t ofs, int getchip,
int allowbbt)
{
struct nand_chip *chip = mtd->priv;
if (!chip->bbt)
return chip->block_bad(mtd, ofs, getchip);
/* Return info from the table */
return nand_isbad_bbt(mtd, ofs, allowbbt);
}
/*
* Wait for the ready pin, after a command
* The timeout is catched later.
*/
static void nand_wait_ready(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd->priv;
unsigned long timeo = jiffies + 2;
led_trigger_event(nand_led_trigger, LED_FULL);
/* wait until command is processed or timeout occures */
do {
if (chip->dev_ready(mtd))
break;
touch_softlockup_watchdog();
} while (time_before(jiffies, timeo));
led_trigger_event(nand_led_trigger, LED_OFF);
}
/**
* nand_command - [DEFAULT] Send command to NAND device
* @mtd: MTD device structure
* @command: the command to be sent
* @column: the column address for this command, -1 if none
* @page_addr: the page address for this command, -1 if none
*
* Send command to NAND device. This function is used for small page
* devices (256/512 Bytes per page)
*/
static void nand_command(struct mtd_info *mtd, unsigned int command,
int column, int page_addr)
{
register struct nand_chip *chip = mtd->priv;
int ctrl = NAND_CTRL_CLE | NAND_CTRL_CHANGE;
/*
* Write out the command to the device.
*/
if (command == NAND_CMD_SEQIN) {
int readcmd;
if (column >= mtd->writesize) {
/* OOB area */
column -= mtd->writesize;
readcmd = NAND_CMD_READOOB;
} else if (column < 256) {
/* First 256 bytes --> READ0 */
readcmd = NAND_CMD_READ0;
} else {
column -= 256;
readcmd = NAND_CMD_READ1;
}
chip->cmd_ctrl(mtd, readcmd, ctrl);
ctrl &= ~NAND_CTRL_CHANGE;
}
chip->cmd_ctrl(mtd, command, ctrl);
/*
* Address cycle, when necessary
*/
ctrl = NAND_CTRL_ALE | NAND_CTRL_CHANGE;
/* Serially input address */
if (column != -1) {
/* Adjust columns for 16 bit buswidth */
if (chip->options & NAND_BUSWIDTH_16)
column >>= 1;
chip->cmd_ctrl(mtd, column, ctrl);
ctrl &= ~NAND_CTRL_CHANGE;
}
if (page_addr != -1) {
chip->cmd_ctrl(mtd, page_addr, ctrl);
ctrl &= ~NAND_CTRL_CHANGE;
chip->cmd_ctrl(mtd, page_addr >> 8, ctrl);
/* One more address cycle for devices > 32MiB */
if (chip->chipsize > (32 << 20))
chip->cmd_ctrl(mtd, page_addr >> 16, ctrl);
}
chip->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
/*
* program and erase have their own busy handlers
* status and sequential in needs no delay
*/
switch (command) {
case NAND_CMD_PAGEPROG:
case NAND_CMD_ERASE1:
case NAND_CMD_ERASE2:
case NAND_CMD_SEQIN:
case NAND_CMD_STATUS:
return;
case NAND_CMD_RESET:
if (chip->dev_ready)
break;
udelay(chip->chip_delay);
chip->cmd_ctrl(mtd, NAND_CMD_STATUS,
NAND_CTRL_CLE | NAND_CTRL_CHANGE);
chip->cmd_ctrl(mtd,
NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
while (!(chip->read_byte(mtd) & NAND_STATUS_READY)) ;
return;
/* This applies to read commands */
default:
/*
* If we don't have access to the busy pin, we apply the given
* command delay
*/
if (!chip->dev_ready) {
udelay(chip->chip_delay);
return;
}
}
/* Apply this short delay always to ensure that we do wait tWB in
* any case on any machine. */
ndelay(100);
nand_wait_ready(mtd);
}
/**
* nand_command_lp - [DEFAULT] Send command to NAND large page device
* @mtd: MTD device structure
* @command: the command to be sent
* @column: the column address for this command, -1 if none
* @page_addr: the page address for this command, -1 if none
*
* Send command to NAND device. This is the version for the new large page
* devices We dont have the separate regions as we have in the small page
* devices. We must emulate NAND_CMD_READOOB to keep the code compatible.
*/
static void nand_command_lp(struct mtd_info *mtd, unsigned int command,
int column, int page_addr)
{
register struct nand_chip *chip = mtd->priv;
/* Emulate NAND_CMD_READOOB */
if (command == NAND_CMD_READOOB) {
column += mtd->writesize;
command = NAND_CMD_READ0;
}
/* Command latch cycle */
chip->cmd_ctrl(mtd, command & 0xff,
NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE);
if (column != -1 || page_addr != -1) {
int ctrl = NAND_CTRL_CHANGE | NAND_NCE | NAND_ALE;
/* Serially input address */
if (column != -1) {
/* Adjust columns for 16 bit buswidth */
if (chip->options & NAND_BUSWIDTH_16)
column >>= 1;
chip->cmd_ctrl(mtd, column, ctrl);
ctrl &= ~NAND_CTRL_CHANGE;
chip->cmd_ctrl(mtd, column >> 8, ctrl);
}
if (page_addr != -1) {
chip->cmd_ctrl(mtd, page_addr, ctrl);
chip->cmd_ctrl(mtd, page_addr >> 8,
NAND_NCE | NAND_ALE);
/* One more address cycle for devices > 128MiB */
if (chip->chipsize > (128 << 20))
chip->cmd_ctrl(mtd, page_addr >> 16,
NAND_NCE | NAND_ALE);
}
}
chip->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
/*
* program and erase have their own busy handlers
* status, sequential in, and deplete1 need no delay
*/
switch (command) {
case NAND_CMD_CACHEDPROG:
case NAND_CMD_PAGEPROG:
case NAND_CMD_ERASE1:
case NAND_CMD_ERASE2:
case NAND_CMD_SEQIN:
case NAND_CMD_RNDIN:
case NAND_CMD_STATUS:
case NAND_CMD_DEPLETE1:
return;
/*
* read error status commands require only a short delay
*/
case NAND_CMD_STATUS_ERROR:
case NAND_CMD_STATUS_ERROR0:
case NAND_CMD_STATUS_ERROR1:
case NAND_CMD_STATUS_ERROR2:
case NAND_CMD_STATUS_ERROR3:
udelay(chip->chip_delay);
return;
case NAND_CMD_RESET:
if (chip->dev_ready)
break;
udelay(chip->chip_delay);
chip->cmd_ctrl(mtd, NAND_CMD_STATUS,
NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE);
chip->cmd_ctrl(mtd, NAND_CMD_NONE,
NAND_NCE | NAND_CTRL_CHANGE);
while (!(chip->read_byte(mtd) & NAND_STATUS_READY)) ;
return;
case NAND_CMD_RNDOUT:
/* No ready / busy check necessary */
chip->cmd_ctrl(mtd, NAND_CMD_RNDOUTSTART,
NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE);
chip->cmd_ctrl(mtd, NAND_CMD_NONE,
NAND_NCE | NAND_CTRL_CHANGE);
return;
case NAND_CMD_READ0:
chip->cmd_ctrl(mtd, NAND_CMD_READSTART,
NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE);
chip->cmd_ctrl(mtd, NAND_CMD_NONE,
NAND_NCE | NAND_CTRL_CHANGE);
/* This applies to read commands */
default:
/*
* If we don't have access to the busy pin, we apply the given
* command delay
*/
if (!chip->dev_ready) {
udelay(chip->chip_delay);
return;
}
}
/* Apply this short delay always to ensure that we do wait tWB in
* any case on any machine. */
ndelay(100);
nand_wait_ready(mtd);
}
/**
* nand_get_device - [GENERIC] Get chip for selected access
* @chip: the nand chip descriptor
* @mtd: MTD device structure
* @new_state: the state which is requested
*
* Get the device and lock it for exclusive access
*/
static int
nand_get_device(struct nand_chip *chip, struct mtd_info *mtd, int new_state)
{
spinlock_t *lock = &chip->controller->lock;
wait_queue_head_t *wq = &chip->controller->wq;
DECLARE_WAITQUEUE(wait, current);
retry:
spin_lock(lock);
/* Hardware controller shared among independend devices */
/* Hardware controller shared among independend devices */
if (!chip->controller->active)
chip->controller->active = chip;
if (chip->controller->active == chip && chip->state == FL_READY) {
chip->state = new_state;
spin_unlock(lock);
return 0;
}
if (new_state == FL_PM_SUSPENDED) {
spin_unlock(lock);
return (chip->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN;
}
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(wq, &wait);
spin_unlock(lock);
schedule();
remove_wait_queue(wq, &wait);
goto retry;
}
/**
* nand_wait - [DEFAULT] wait until the command is done
* @mtd: MTD device structure
* @chip: NAND chip structure
*
* Wait for command done. This applies to erase and program only
* Erase can take up to 400ms and program up to 20ms according to
* general NAND and SmartMedia specs
*/
static int nand_wait(struct mtd_info *mtd, struct nand_chip *chip)
{
unsigned long timeo = jiffies;
int status, state = chip->state;
if (state == FL_ERASING)
timeo += (HZ * 400) / 1000;
else
timeo += (HZ * 20) / 1000;
led_trigger_event(nand_led_trigger, LED_FULL);
/* Apply this short delay always to ensure that we do wait tWB in
* any case on any machine. */
ndelay(100);
if ((state == FL_ERASING) && (chip->options & NAND_IS_AND))
chip->cmdfunc(mtd, NAND_CMD_STATUS_MULTI, -1, -1);
else
chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
while (time_before(jiffies, timeo)) {
if (chip->dev_ready) {
if (chip->dev_ready(mtd))
break;
} else {
if (chip->read_byte(mtd) & NAND_STATUS_READY)
break;
}
cond_resched();
}
led_trigger_event(nand_led_trigger, LED_OFF);
status = (int)chip->read_byte(mtd);
return status;
}
/**
* nand_read_page_raw - [Intern] read raw page data without ecc
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: buffer to store read data
*/
static int nand_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf)
{
chip->read_buf(mtd, buf, mtd->writesize);
chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
return 0;
}
/**
* nand_read_page_swecc - {REPLACABLE] software ecc based page read function
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: buffer to store read data
*/
static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf)
{
int i, eccsize = chip->ecc.size;
int eccbytes = chip->ecc.bytes;
int eccsteps = chip->ecc.steps;
uint8_t *p = buf;
uint8_t *ecc_calc = chip->buffers.ecccalc;
uint8_t *ecc_code = chip->buffers.ecccode;
int *eccpos = chip->ecc.layout->eccpos;
nand_read_page_raw(mtd, chip, buf);
for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
chip->ecc.calculate(mtd, p, &ecc_calc[i]);
for (i = 0; i < chip->ecc.total; i++)
ecc_code[i] = chip->oob_poi[eccpos[i]];
eccsteps = chip->ecc.steps;
p = buf;
for (i = 0 ; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
int stat;
stat = chip->ecc.correct(mtd, p, &ecc_code[i], &ecc_calc[i]);
if (stat == -1)
mtd->ecc_stats.failed++;
else
mtd->ecc_stats.corrected += stat;
}
return 0;
}
/**
* nand_read_page_hwecc - {REPLACABLE] hardware ecc based page read function
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: buffer to store read data
*
* Not for syndrome calculating ecc controllers which need a special oob layout
*/
static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf)
{
int i, eccsize = chip->ecc.size;
int eccbytes = chip->ecc.bytes;
int eccsteps = chip->ecc.steps;
uint8_t *p = buf;
uint8_t *ecc_calc = chip->buffers.ecccalc;
uint8_t *ecc_code = chip->buffers.ecccode;
int *eccpos = chip->ecc.layout->eccpos;
for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
chip->ecc.hwctl(mtd, NAND_ECC_READ);
chip->read_buf(mtd, p, eccsize);
chip->ecc.calculate(mtd, p, &ecc_calc[i]);
}
chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
for (i = 0; i < chip->ecc.total; i++)
ecc_code[i] = chip->oob_poi[eccpos[i]];
eccsteps = chip->ecc.steps;
p = buf;
for (i = 0 ; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
int stat;
stat = chip->ecc.correct(mtd, p, &ecc_code[i], &ecc_calc[i]);
if (stat == -1)
mtd->ecc_stats.failed++;
else
mtd->ecc_stats.corrected += stat;
}
return 0;
}
/**
* nand_read_page_syndrome - {REPLACABLE] hardware ecc syndrom based page read
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: buffer to store read data
*
* The hw generator calculates the error syndrome automatically. Therefor
* we need a special oob layout and handling.
*/
static int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf)
{
int i, eccsize = chip->ecc.size;
int eccbytes = chip->ecc.bytes;
int eccsteps = chip->ecc.steps;
uint8_t *p = buf;
uint8_t *oob = chip->oob_poi;
for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
int stat;
chip->ecc.hwctl(mtd, NAND_ECC_READ);
chip->read_buf(mtd, p, eccsize);
if (chip->ecc.prepad) {
chip->read_buf(mtd, oob, chip->ecc.prepad);
oob += chip->ecc.prepad;
}
chip->ecc.hwctl(mtd, NAND_ECC_READSYN);
chip->read_buf(mtd, oob, eccbytes);
stat = chip->ecc.correct(mtd, p, oob, NULL);
if (stat == -1)
mtd->ecc_stats.failed++;
else
mtd->ecc_stats.corrected += stat;
oob += eccbytes;
if (chip->ecc.postpad) {
chip->read_buf(mtd, oob, chip->ecc.postpad);
oob += chip->ecc.postpad;
}
}
/* Calculate remaining oob bytes */
i = mtd->oobsize - (oob - chip->oob_poi);
if (i)
chip->read_buf(mtd, oob, i);
return 0;
}
/**
* nand_transfer_oob - [Internal] Transfer oob to client buffer
* @chip: nand chip structure
* @oob: oob destination address
* @ops: oob ops structure
*/
static uint8_t *nand_transfer_oob(struct nand_chip *chip, uint8_t *oob,
struct mtd_oob_ops *ops)
{
size_t len = ops->ooblen;
switch(ops->mode) {
case MTD_OOB_PLACE:
case MTD_OOB_RAW:
memcpy(oob, chip->oob_poi + ops->ooboffs, len);
return oob + len;
case MTD_OOB_AUTO: {
struct nand_oobfree *free = chip->ecc.layout->oobfree;
uint32_t boffs = 0, roffs = ops->ooboffs;
size_t bytes = 0;
for(; free->length && len; free++, len -= bytes) {
/* Read request not from offset 0 ? */
if (unlikely(roffs)) {
if (roffs >= free->length) {
roffs -= free->length;
continue;
}
boffs = free->offset + roffs;
bytes = min_t(size_t, len,
(free->length - roffs));
roffs = 0;
} else {
bytes = min_t(size_t, len, free->length);
boffs = free->offset;
}
memcpy(oob, chip->oob_poi + boffs, bytes);
oob += bytes;
}
return oob;
}
default:
BUG();
}
return NULL;
}
/**
* nand_do_read_ops - [Internal] Read data with ECC
*
* @mtd: MTD device structure
* @from: offset to read from
* @ops: oob ops structure
*
* Internal function. Called with chip held.
*/
static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
struct mtd_oob_ops *ops)
{
int chipnr, page, realpage, col, bytes, aligned;
struct nand_chip *chip = mtd->priv;
struct mtd_ecc_stats stats;
int blkcheck = (1 << (chip->phys_erase_shift - chip->page_shift)) - 1;
int sndcmd = 1;
int ret = 0;
uint32_t readlen = ops->len;
uint8_t *bufpoi, *oob, *buf;
stats = mtd->ecc_stats;
chipnr = (int)(from >> chip->chip_shift);
chip->select_chip(mtd, chipnr);
realpage = (int)(from >> chip->page_shift);
page = realpage & chip->pagemask;
col = (int)(from & (mtd->writesize - 1));
chip->oob_poi = chip->buffers.oobrbuf;
buf = ops->datbuf;
oob = ops->oobbuf;
while(1) {
bytes = min(mtd->writesize - col, readlen);
aligned = (bytes == mtd->writesize);
/* Is the current page in the buffer ? */
if (realpage != chip->pagebuf || oob) {
bufpoi = aligned ? buf : chip->buffers.databuf;
if (likely(sndcmd)) {
chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page);
sndcmd = 0;
}
/* Now read the page into the buffer */
ret = chip->ecc.read_page(mtd, chip, bufpoi);
if (ret < 0)
break;
/* Transfer not aligned data */
if (!aligned) {
chip->pagebuf = realpage;
memcpy(buf, chip->buffers.databuf + col, bytes);
}
buf += bytes;
if (unlikely(oob)) {
/* Raw mode does data:oob:data:oob */
if (ops->mode != MTD_OOB_RAW)
oob = nand_transfer_oob(chip, oob, ops);
else
buf = nand_transfer_oob(chip, buf, ops);
}
if (!(chip->options & NAND_NO_READRDY)) {
/*
* Apply delay or wait for ready/busy pin. Do
* this before the AUTOINCR check, so no
* problems arise if a chip which does auto
* increment is marked as NOAUTOINCR by the
* board driver.
*/
if (!chip->dev_ready)
udelay(chip->chip_delay);
else
nand_wait_ready(mtd);
}
} else {
memcpy(buf, chip->buffers.databuf + col, bytes);
buf += bytes;
}
readlen -= bytes;
if (!readlen)
break;
/* For subsequent reads align to page boundary. */
col = 0;
/* Increment page address */
realpage++;
page = realpage & chip->pagemask;
/* Check, if we cross a chip boundary */
if (!page) {
chipnr++;
chip->select_chip(mtd, -1);
chip->select_chip(mtd, chipnr);
}
/* Check, if the chip supports auto page increment
* or if we have hit a block boundary.
*/
if (!NAND_CANAUTOINCR(chip) || !(page & blkcheck))
sndcmd = 1;
}
ops->retlen = ops->len - (size_t) readlen;
if (ret)
return ret;
if (mtd->ecc_stats.failed - stats.failed)
return -EBADMSG;
return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
}
/**
* nand_read - [MTD Interface] MTD compability function for nand_do_read_ecc
* @mtd: MTD device structure
* @from: offset to read from
* @len: number of bytes to read
* @retlen: pointer to variable to store the number of read bytes
* @buf: the databuffer to put data
*
* Get hold of the chip and call nand_do_read
*/
static int nand_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, uint8_t *buf)
{
struct nand_chip *chip = mtd->priv;
int ret;
/* Do not allow reads past end of device */
if ((from + len) > mtd->size)
return -EINVAL;
if (!len)
return 0;
nand_get_device(chip, mtd, FL_READING);
chip->ops.len = len;
chip->ops.datbuf = buf;
chip->ops.oobbuf = NULL;
ret = nand_do_read_ops(mtd, from, &chip->ops);
*retlen = chip->ops.retlen;
nand_release_device(mtd);
return ret;
}
/**
* nand_read_oob_std - [REPLACABLE] the most common OOB data read function
* @mtd: mtd info structure
* @chip: nand chip info structure
* @page: page number to read
* @sndcmd: flag whether to issue read command or not
*/
static int nand_read_oob_std(struct mtd_info *mtd, struct nand_chip *chip,
int page, int sndcmd)
{
if (sndcmd) {
chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
sndcmd = 0;
}
chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
return sndcmd;
}
/**
* nand_read_oob_syndrome - [REPLACABLE] OOB data read function for HW ECC
* with syndromes
* @mtd: mtd info structure
* @chip: nand chip info structure
* @page: page number to read
* @sndcmd: flag whether to issue read command or not
*/
static int nand_read_oob_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
int page, int sndcmd)
{
uint8_t *buf = chip->oob_poi;
int length = mtd->oobsize;
int chunk = chip->ecc.bytes + chip->ecc.prepad + chip->ecc.postpad;
int eccsize = chip->ecc.size;
uint8_t *bufpoi = buf;
int i, toread, sndrnd = 0, pos;
chip->cmdfunc(mtd, NAND_CMD_READ0, chip->ecc.size, page);
for (i = 0; i < chip->ecc.steps; i++) {
if (sndrnd) {
pos = eccsize + i * (eccsize + chunk);
if (mtd->writesize > 512)
chip->cmdfunc(mtd, NAND_CMD_RNDOUT, pos, -1);
else
chip->cmdfunc(mtd, NAND_CMD_READ0, pos, page);
} else
sndrnd = 1;
toread = min_t(int, length, chunk);
chip->read_buf(mtd, bufpoi, toread);
bufpoi += toread;
length -= toread;
}
if (length > 0)
chip->read_buf(mtd, bufpoi, length);
return 1;
}
/**
* nand_write_oob_std - [REPLACABLE] the most common OOB data write function
* @mtd: mtd info structure
* @chip: nand chip info structure
* @page: page number to write
*/
static int nand_write_oob_std(struct mtd_info *mtd, struct nand_chip *chip,
int page)
{
int status = 0;
const uint8_t *buf = chip->oob_poi;
int length = mtd->oobsize;
chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize, page);
chip->write_buf(mtd, buf, length);
/* Send command to program the OOB data */
chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
status = chip->waitfunc(mtd, chip);
return status & NAND_STATUS_FAIL ? -EIO : 0;
}
/**
* nand_write_oob_syndrome - [REPLACABLE] OOB data write function for HW ECC
* with syndrome - only for large page flash !
* @mtd: mtd info structure
* @chip: nand chip info structure
* @page: page number to write
*/
static int nand_write_oob_syndrome(struct mtd_info *mtd,
struct nand_chip *chip, int page)
{
int chunk = chip->ecc.bytes + chip->ecc.prepad + chip->ecc.postpad;
int eccsize = chip->ecc.size, length = mtd->oobsize;
int i, len, pos, status = 0, sndcmd = 0, steps = chip->ecc.steps;
const uint8_t *bufpoi = chip->oob_poi;
/*
* data-ecc-data-ecc ... ecc-oob
* or
* data-pad-ecc-pad-data-pad .... ecc-pad-oob
*/
if (!chip->ecc.prepad && !chip->ecc.postpad) {
pos = steps * (eccsize + chunk);
steps = 0;
} else
pos = eccsize;
chip->cmdfunc(mtd, NAND_CMD_SEQIN, pos, page);
for (i = 0; i < steps; i++) {
if (sndcmd) {
if (mtd->writesize <= 512) {
uint32_t fill = 0xFFFFFFFF;
len = eccsize;
while (len > 0) {
int num = min_t(int, len, 4);
chip->write_buf(mtd, (uint8_t *)&fill,
num);
len -= num;
}
} else {
pos = eccsize + i * (eccsize + chunk);
chip->cmdfunc(mtd, NAND_CMD_RNDIN, pos, -1);
}
} else
sndcmd = 1;
len = min_t(int, length, chunk);
chip->write_buf(mtd, bufpoi, len);
bufpoi += len;
length -= len;
}
if (length > 0)
chip->write_buf(mtd, bufpoi, length);
chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
status = chip->waitfunc(mtd, chip);
return status & NAND_STATUS_FAIL ? -EIO : 0;
}
/**
* nand_do_read_oob - [Intern] NAND read out-of-band
* @mtd: MTD device structure
* @from: offset to read from
* @ops: oob operations description structure
*
* NAND read out-of-band data from the spare area
*/
static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
struct mtd_oob_ops *ops)
{
int page, realpage, chipnr, sndcmd = 1;
struct nand_chip *chip = mtd->priv;
int blkcheck = (1 << (chip->phys_erase_shift - chip->page_shift)) - 1;
int readlen = ops->len;
uint8_t *buf = ops->oobbuf;
DEBUG(MTD_DEBUG_LEVEL3, "nand_read_oob: from = 0x%08Lx, len = %i\n",
(unsigned long long)from, readlen);
chipnr = (int)(from >> chip->chip_shift);
chip->select_chip(mtd, chipnr);
/* Shift to get page */
realpage = (int)(from >> chip->page_shift);
page = realpage & chip->pagemask;
chip->oob_poi = chip->buffers.oobrbuf;
while(1) {
sndcmd = chip->ecc.read_oob(mtd, chip, page, sndcmd);
buf = nand_transfer_oob(chip, buf, ops);
if (!(chip->options & NAND_NO_READRDY)) {
/*
* Apply delay or wait for ready/busy pin. Do this
* before the AUTOINCR check, so no problems arise if a
* chip which does auto increment is marked as
* NOAUTOINCR by the board driver.
*/
if (!chip->dev_ready)
udelay(chip->chip_delay);
else
nand_wait_ready(mtd);
}
readlen -= ops->ooblen;
if (!readlen)
break;
/* Increment page address */
realpage++;
page = realpage & chip->pagemask;
/* Check, if we cross a chip boundary */
if (!page) {
chipnr++;
chip->select_chip(mtd, -1);
chip->select_chip(mtd, chipnr);
}
/* Check, if the chip supports auto page increment
* or if we have hit a block boundary.
*/
if (!NAND_CANAUTOINCR(chip) || !(page & blkcheck))
sndcmd = 1;
}
ops->retlen = ops->len;
return 0;
}
/**
* nand_read_oob - [MTD Interface] NAND read data and/or out-of-band
* @mtd: MTD device structure
* @from: offset to read from
* @ops: oob operation description structure
*
* NAND read data and/or out-of-band data
*/
static int nand_read_oob(struct mtd_info *mtd, loff_t from,
struct mtd_oob_ops *ops)
{
int (*read_page)(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf) = NULL;
struct nand_chip *chip = mtd->priv;
int ret = -ENOTSUPP;
ops->retlen = 0;
/* Do not allow reads past end of device */
if ((from + ops->len) > mtd->size) {
DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: "
"Attempt read beyond end of device\n");
return -EINVAL;
}
nand_get_device(chip, mtd, FL_READING);
switch(ops->mode) {
case MTD_OOB_PLACE:
case MTD_OOB_AUTO:
break;
case MTD_OOB_RAW:
/* Replace the read_page algorithm temporary */
read_page = chip->ecc.read_page;
chip->ecc.read_page = nand_read_page_raw;
break;
default:
goto out;
}
if (!ops->datbuf)
ret = nand_do_read_oob(mtd, from, ops);
else
ret = nand_do_read_ops(mtd, from, ops);
if (unlikely(ops->mode == MTD_OOB_RAW))
chip->ecc.read_page = read_page;
out:
nand_release_device(mtd);
return ret;
}
/**
* nand_write_page_raw - [Intern] raw page write function
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: data buffer
*/
static void nand_write_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf)
{
chip->write_buf(mtd, buf, mtd->writesize);
chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
}
/**
* nand_write_page_swecc - {REPLACABLE] software ecc based page write function
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: data buffer
*/
static void nand_write_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf)
{
int i, eccsize = chip->ecc.size;
int eccbytes = chip->ecc.bytes;
int eccsteps = chip->ecc.steps;
uint8_t *ecc_calc = chip->buffers.ecccalc;
const uint8_t *p = buf;
int *eccpos = chip->ecc.layout->eccpos;
/* Software ecc calculation */
for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
chip->ecc.calculate(mtd, p, &ecc_calc[i]);
for (i = 0; i < chip->ecc.total; i++)
chip->oob_poi[eccpos[i]] = ecc_calc[i];
nand_write_page_raw(mtd, chip, buf);
}
/**
* nand_write_page_hwecc - {REPLACABLE] hardware ecc based page write function
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: data buffer
*/
static void nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf)
{
int i, eccsize = chip->ecc.size;
int eccbytes = chip->ecc.bytes;
int eccsteps = chip->ecc.steps;
uint8_t *ecc_calc = chip->buffers.ecccalc;
const uint8_t *p = buf;
int *eccpos = chip->ecc.layout->eccpos;
for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
chip->write_buf(mtd, p, eccsize);
chip->ecc.calculate(mtd, p, &ecc_calc[i]);
}
for (i = 0; i < chip->ecc.total; i++)
chip->oob_poi[eccpos[i]] = ecc_calc[i];
chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
}
/**
* nand_write_page_syndrome - {REPLACABLE] hardware ecc syndrom based page write
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: data buffer
*
* The hw generator calculates the error syndrome automatically. Therefor
* we need a special oob layout and handling.
*/
static void nand_write_page_syndrome(struct mtd_info *mtd,
struct nand_chip *chip, const uint8_t *buf)
{
int i, eccsize = chip->ecc.size;
int eccbytes = chip->ecc.bytes;
int eccsteps = chip->ecc.steps;
const uint8_t *p = buf;
uint8_t *oob = chip->oob_poi;
for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
chip->write_buf(mtd, p, eccsize);
if (chip->ecc.prepad) {
chip->write_buf(mtd, oob, chip->ecc.prepad);
oob += chip->ecc.prepad;
}
chip->ecc.calculate(mtd, p, oob);
chip->write_buf(mtd, oob, eccbytes);
oob += eccbytes;
if (chip->ecc.postpad) {
chip->write_buf(mtd, oob, chip->ecc.postpad);
oob += chip->ecc.postpad;
}
}
/* Calculate remaining oob bytes */
i = mtd->oobsize - (oob - chip->oob_poi);
if (i)
chip->write_buf(mtd, oob, i);
}
/**
* nand_write_page - [INTERNAL] write one page
* @mtd: MTD device structure
* @chip: NAND chip descriptor
* @buf: the data to write
* @page: page number to write
* @cached: cached programming
*/
static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf, int page, int cached)
{
int status;
chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
chip->ecc.write_page(mtd, chip, buf);
/*
* Cached progamming disabled for now, Not sure if its worth the
* trouble. The speed gain is not very impressive. (2.3->2.6Mib/s)
*/
cached = 0;
if (!cached || !(chip->options & NAND_CACHEPRG)) {
chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
status = chip->waitfunc(mtd, chip);
/*
* See if operation failed and additional status checks are
* available
*/
if ((status & NAND_STATUS_FAIL) && (chip->errstat))
status = chip->errstat(mtd, chip, FL_WRITING, status,
page);
if (status & NAND_STATUS_FAIL)
return -EIO;
} else {
chip->cmdfunc(mtd, NAND_CMD_CACHEDPROG, -1, -1);
status = chip->waitfunc(mtd, chip);
}
#ifdef CONFIG_MTD_NAND_VERIFY_WRITE
/* Send command to read back the data */
chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
if (chip->verify_buf(mtd, buf, mtd->writesize))
return -EIO;
#endif
return 0;
}
/**
* nand_fill_oob - [Internal] Transfer client buffer to oob
* @chip: nand chip structure
* @oob: oob data buffer
* @ops: oob ops structure
*/
static uint8_t *nand_fill_oob(struct nand_chip *chip, uint8_t *oob,
struct mtd_oob_ops *ops)
{
size_t len = ops->ooblen;
switch(ops->mode) {
case MTD_OOB_PLACE:
case MTD_OOB_RAW:
memcpy(chip->oob_poi + ops->ooboffs, oob, len);
return oob + len;
case MTD_OOB_AUTO: {
struct nand_oobfree *free = chip->ecc.layout->oobfree;
uint32_t boffs = 0, woffs = ops->ooboffs;
size_t bytes = 0;
for(; free->length && len; free++, len -= bytes) {
/* Write request not from offset 0 ? */
if (unlikely(woffs)) {
if (woffs >= free->length) {
woffs -= free->length;
continue;
}
boffs = free->offset + woffs;
bytes = min_t(size_t, len,
(free->length - woffs));
woffs = 0;
} else {
bytes = min_t(size_t, len, free->length);
boffs = free->offset;
}
memcpy(chip->oob_poi + boffs, oob, bytes);
oob += bytes;
}
return oob;
}
default:
BUG();
}
return NULL;
}
#define NOTALIGNED(x) (x & (mtd->writesize-1)) != 0
/**
* nand_do_write_ops - [Internal] NAND write with ECC
* @mtd: MTD device structure
* @to: offset to write to
* @ops: oob operations description structure
*
* NAND write with ECC
*/
static int nand_do_write_ops(struct mtd_info *mtd, loff_t to,
struct mtd_oob_ops *ops)
{
int chipnr, realpage, page, blockmask;
struct nand_chip *chip = mtd->priv;
uint32_t writelen = ops->len;
uint8_t *oob = ops->oobbuf;
uint8_t *buf = ops->datbuf;
int bytes = mtd->writesize;
int ret;
ops->retlen = 0;
/* reject writes, which are not page aligned */
if (NOTALIGNED(to) || NOTALIGNED(ops->len)) {
printk(KERN_NOTICE "nand_write: "
"Attempt to write not page aligned data\n");
return -EINVAL;
}
if (!writelen)
return 0;
chipnr = (int)(to >> chip->chip_shift);
chip->select_chip(mtd, chipnr);
/* Check, if it is write protected */
if (nand_check_wp(mtd))
return -EIO;
realpage = (int)(to >> chip->page_shift);
page = realpage & chip->pagemask;
blockmask = (1 << (chip->phys_erase_shift - chip->page_shift)) - 1;
/* Invalidate the page cache, when we write to the cached page */
if (to <= (chip->pagebuf << chip->page_shift) &&
(chip->pagebuf << chip->page_shift) < (to + ops->len))
chip->pagebuf = -1;
chip->oob_poi = chip->buffers.oobwbuf;
while(1) {
int cached = writelen > bytes && page != blockmask;
if (unlikely(oob))
oob = nand_fill_oob(chip, oob, ops);
ret = nand_write_page(mtd, chip, buf, page, cached);
if (ret)
break;
writelen -= bytes;
if (!writelen)
break;
buf += bytes;
realpage++;
page = realpage & chip->pagemask;
/* Check, if we cross a chip boundary */
if (!page) {
chipnr++;
chip->select_chip(mtd, -1);
chip->select_chip(mtd, chipnr);
}
}
if (unlikely(oob))
memset(chip->oob_poi, 0xff, mtd->oobsize);
ops->retlen = ops->len - writelen;
return ret;
}
/**
* nand_write - [MTD Interface] NAND write with ECC
* @mtd: MTD device structure
* @to: offset to write to
* @len: number of bytes to write
* @retlen: pointer to variable to store the number of written bytes
* @buf: the data to write
*
* NAND write with ECC
*/
static int nand_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const uint8_t *buf)
{
struct nand_chip *chip = mtd->priv;
int ret;
/* Do not allow reads past end of device */
if ((to + len) > mtd->size)
return -EINVAL;
if (!len)
return 0;
nand_get_device(chip, mtd, FL_WRITING);
chip->ops.len = len;
chip->ops.datbuf = (uint8_t *)buf;
chip->ops.oobbuf = NULL;
ret = nand_do_write_ops(mtd, to, &chip->ops);
*retlen = chip->ops.retlen;
nand_release_device(mtd);
return ret;
}
/**
* nand_do_write_oob - [MTD Interface] NAND write out-of-band
* @mtd: MTD device structure
* @to: offset to write to
* @ops: oob operation description structure
*
* NAND write out-of-band
*/
static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
struct mtd_oob_ops *ops)
{
int chipnr, page, status;
struct nand_chip *chip = mtd->priv;
DEBUG(MTD_DEBUG_LEVEL3, "nand_write_oob: to = 0x%08x, len = %i\n",
(unsigned int)to, (int)ops->len);
/* Do not allow write past end of page */
if ((ops->ooboffs + ops->len) > mtd->oobsize) {
DEBUG(MTD_DEBUG_LEVEL0, "nand_write_oob: "
"Attempt to write past end of page\n");
return -EINVAL;
}
chipnr = (int)(to >> chip->chip_shift);
chip->select_chip(mtd, chipnr);
/* Shift to get page */
page = (int)(to >> chip->page_shift);
/*
* Reset the chip. Some chips (like the Toshiba TC5832DC found in one
* of my DiskOnChip 2000 test units) will clear the whole data page too
* if we don't do this. I have no clue why, but I seem to have 'fixed'
* it in the doc2000 driver in August 1999. dwmw2.
*/
chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
/* Check, if it is write protected */
if (nand_check_wp(mtd))
return -EROFS;
/* Invalidate the page cache, if we write to the cached page */
if (page == chip->pagebuf)
chip->pagebuf = -1;
chip->oob_poi = chip->buffers.oobwbuf;
memset(chip->oob_poi, 0xff, mtd->oobsize);
nand_fill_oob(chip, ops->oobbuf, ops);
status = chip->ecc.write_oob(mtd, chip, page & chip->pagemask);
memset(chip->oob_poi, 0xff, mtd->oobsize);
if (status)
return status;
ops->retlen = ops->len;
return 0;
}
/**
* nand_write_oob - [MTD Interface] NAND write data and/or out-of-band
* @mtd: MTD device structure
* @to: offset to write to
* @ops: oob operation description structure
*/
static int nand_write_oob(struct mtd_info *mtd, loff_t to,
struct mtd_oob_ops *ops)
{
void (*write_page)(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf) = NULL;
struct nand_chip *chip = mtd->priv;
int ret = -ENOTSUPP;
ops->retlen = 0;
/* Do not allow writes past end of device */
if ((to + ops->len) > mtd->size) {
DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: "
"Attempt read beyond end of device\n");
return -EINVAL;
}
nand_get_device(chip, mtd, FL_WRITING);
switch(ops->mode) {
case MTD_OOB_PLACE:
case MTD_OOB_AUTO:
break;
case MTD_OOB_RAW:
/* Replace the write_page algorithm temporary */
write_page = chip->ecc.write_page;
chip->ecc.write_page = nand_write_page_raw;
break;
default:
goto out;
}
if (!ops->datbuf)
ret = nand_do_write_oob(mtd, to, ops);
else
ret = nand_do_write_ops(mtd, to, ops);
if (unlikely(ops->mode == MTD_OOB_RAW))
chip->ecc.write_page = write_page;
out:
nand_release_device(mtd);
return ret;
}
/**
* single_erease_cmd - [GENERIC] NAND standard block erase command function
* @mtd: MTD device structure
* @page: the page address of the block which will be erased
*
* Standard erase command for NAND chips
*/
static void single_erase_cmd(struct mtd_info *mtd, int page)
{
struct nand_chip *chip = mtd->priv;
/* Send commands to erase a block */
chip->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page);
chip->cmdfunc(mtd, NAND_CMD_ERASE2, -1, -1);
}
/**
* multi_erease_cmd - [GENERIC] AND specific block erase command function
* @mtd: MTD device structure
* @page: the page address of the block which will be erased
*
* AND multi block erase command function
* Erase 4 consecutive blocks
*/
static void multi_erase_cmd(struct mtd_info *mtd, int page)
{
struct nand_chip *chip = mtd->priv;
/* Send commands to erase a block */
chip->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page++);
chip->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page++);
chip->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page++);
chip->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page);
chip->cmdfunc(mtd, NAND_CMD_ERASE2, -1, -1);
}
/**
* nand_erase - [MTD Interface] erase block(s)
* @mtd: MTD device structure
* @instr: erase instruction
*
* Erase one ore more blocks
*/
static int nand_erase(struct mtd_info *mtd, struct erase_info *instr)
{
return nand_erase_nand(mtd, instr, 0);
}
#define BBT_PAGE_MASK 0xffffff3f
/**
* nand_erase_nand - [Internal] erase block(s)
* @mtd: MTD device structure
* @instr: erase instruction
* @allowbbt: allow erasing the bbt area
*
* Erase one ore more blocks
*/
int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr,
int allowbbt)
{
int page, len, status, pages_per_block, ret, chipnr;
struct nand_chip *chip = mtd->priv;
int rewrite_bbt[NAND_MAX_CHIPS]={0};
unsigned int bbt_masked_page = 0xffffffff;
DEBUG(MTD_DEBUG_LEVEL3, "nand_erase: start = 0x%08x, len = %i\n",
(unsigned int)instr->addr, (unsigned int)instr->len);
/* Start address must align on block boundary */
if (instr->addr & ((1 << chip->phys_erase_shift) - 1)) {
DEBUG(MTD_DEBUG_LEVEL0, "nand_erase: Unaligned address\n");
return -EINVAL;
}
/* Length must align on block boundary */
if (instr->len & ((1 << chip->phys_erase_shift) - 1)) {
DEBUG(MTD_DEBUG_LEVEL0, "nand_erase: "
"Length not block aligned\n");
return -EINVAL;
}
/* Do not allow erase past end of device */
if ((instr->len + instr->addr) > mtd->size) {
DEBUG(MTD_DEBUG_LEVEL0, "nand_erase: "
"Erase past end of device\n");
return -EINVAL;
}
instr->fail_addr = 0xffffffff;
/* Grab the lock and see if the device is available */
nand_get_device(chip, mtd, FL_ERASING);
/* Shift to get first page */
page = (int)(instr->addr >> chip->page_shift);
chipnr = (int)(instr->addr >> chip->chip_shift);
/* Calculate pages in each block */
pages_per_block = 1 << (chip->phys_erase_shift - chip->page_shift);
/* Select the NAND device */
chip->select_chip(mtd, chipnr);
/* Check, if it is write protected */
if (nand_check_wp(mtd)) {
DEBUG(MTD_DEBUG_LEVEL0, "nand_erase: "
"Device is write protected!!!\n");
instr->state = MTD_ERASE_FAILED;
goto erase_exit;
}
/*
* If BBT requires refresh, set the BBT page mask to see if the BBT
* should be rewritten. Otherwise the mask is set to 0xffffffff which
* can not be matched. This is also done when the bbt is actually
* erased to avoid recusrsive updates
*/
if (chip->options & BBT_AUTO_REFRESH && !allowbbt)
bbt_masked_page = chip->bbt_td->pages[chipnr] & BBT_PAGE_MASK;
/* Loop through the pages */
len = instr->len;
instr->state = MTD_ERASING;
while (len) {
/*
* heck if we have a bad block, we do not erase bad blocks !
*/
if (nand_block_checkbad(mtd, ((loff_t) page) <<
chip->page_shift, 0, allowbbt)) {
printk(KERN_WARNING "nand_erase: attempt to erase a "
"bad block at page 0x%08x\n", page);
instr->state = MTD_ERASE_FAILED;
goto erase_exit;
}
/*
* Invalidate the page cache, if we erase the block which
* contains the current cached page
*/
if (page <= chip->pagebuf && chip->pagebuf <
(page + pages_per_block))
chip->pagebuf = -1;
chip->erase_cmd(mtd, page & chip->pagemask);
status = chip->waitfunc(mtd, chip);
/*
* See if operation failed and additional status checks are
* available
*/
if ((status & NAND_STATUS_FAIL) && (chip->errstat))
status = chip->errstat(mtd, chip, FL_ERASING,
status, page);
/* See if block erase succeeded */
if (status & NAND_STATUS_FAIL) {
DEBUG(MTD_DEBUG_LEVEL0, "nand_erase: "
"Failed erase, page 0x%08x\n", page);
instr->state = MTD_ERASE_FAILED;
instr->fail_addr = (page << chip->page_shift);
goto erase_exit;
}
/*
* If BBT requires refresh, set the BBT rewrite flag to the
* page being erased
*/
if (bbt_masked_page != 0xffffffff &&
(page & BBT_PAGE_MASK) == bbt_masked_page)
rewrite_bbt[chipnr] = (page << chip->page_shift);
/* Increment page address and decrement length */
len -= (1 << chip->phys_erase_shift);
page += pages_per_block;
/* Check, if we cross a chip boundary */
if (len && !(page & chip->pagemask)) {
chipnr++;
chip->select_chip(mtd, -1);
chip->select_chip(mtd, chipnr);
/*
* If BBT requires refresh and BBT-PERCHIP, set the BBT
* page mask to see if this BBT should be rewritten
*/
if (bbt_masked_page != 0xffffffff &&
(chip->bbt_td->options & NAND_BBT_PERCHIP))
bbt_masked_page = chip->bbt_td->pages[chipnr] &
BBT_PAGE_MASK;
}
}
instr->state = MTD_ERASE_DONE;
erase_exit:
ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO;
/* Do call back function */
if (!ret)
mtd_erase_callback(instr);
/* Deselect and wake up anyone waiting on the device */
nand_release_device(mtd);
/*
* If BBT requires refresh and erase was successful, rewrite any
* selected bad block tables
*/
if (bbt_masked_page == 0xffffffff || ret)
return ret;
for (chipnr = 0; chipnr < chip->numchips; chipnr++) {
if (!rewrite_bbt[chipnr])
continue;
/* update the BBT for chip */
DEBUG(MTD_DEBUG_LEVEL0, "nand_erase_nand: nand_update_bbt "
"(%d:0x%0x 0x%0x)\n", chipnr, rewrite_bbt[chipnr],
chip->bbt_td->pages[chipnr]);
nand_update_bbt(mtd, rewrite_bbt[chipnr]);
}
/* Return more or less happy */
return ret;
}
/**
* nand_sync - [MTD Interface] sync
* @mtd: MTD device structure
*
* Sync is actually a wait for chip ready function
*/
static void nand_sync(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd->priv;
DEBUG(MTD_DEBUG_LEVEL3, "nand_sync: called\n");
/* Grab the lock and see if the device is available */
nand_get_device(chip, mtd, FL_SYNCING);
/* Release it and go back */
nand_release_device(mtd);
}
/**
* nand_block_isbad - [MTD Interface] Check if block at offset is bad
* @mtd: MTD device structure
* @offs: offset relative to mtd start
*/
static int nand_block_isbad(struct mtd_info *mtd, loff_t offs)
{
/* Check for invalid offset */
if (offs > mtd->size)
return -EINVAL;
return nand_block_checkbad(mtd, offs, 1, 0);
}
/**
* nand_block_markbad - [MTD Interface] Mark block at the given offset as bad
* @mtd: MTD device structure
* @ofs: offset relative to mtd start
*/
static int nand_block_markbad(struct mtd_info *mtd, loff_t ofs)
{
struct nand_chip *chip = mtd->priv;
int ret;
if ((ret = nand_block_isbad(mtd, ofs))) {
/* If it was bad already, return success and do nothing. */
if (ret > 0)
return 0;
return ret;
}
return chip->block_markbad(mtd, ofs);
}
/**
* nand_suspend - [MTD Interface] Suspend the NAND flash
* @mtd: MTD device structure
*/
static int nand_suspend(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd->priv;
return nand_get_device(chip, mtd, FL_PM_SUSPENDED);
}
/**
* nand_resume - [MTD Interface] Resume the NAND flash
* @mtd: MTD device structure
*/
static void nand_resume(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd->priv;
if (chip->state == FL_PM_SUSPENDED)
nand_release_device(mtd);
else
printk(KERN_ERR "nand_resume() called for a chip which is not "
"in suspended state\n");
}
/*
* Set default functions
*/
static void nand_set_defaults(struct nand_chip *chip, int busw)
{
/* check for proper chip_delay setup, set 20us if not */
if (!chip->chip_delay)
chip->chip_delay = 20;
/* check, if a user supplied command function given */
if (chip->cmdfunc == NULL)
chip->cmdfunc = nand_command;
/* check, if a user supplied wait function given */
if (chip->waitfunc == NULL)
chip->waitfunc = nand_wait;
if (!chip->select_chip)
chip->select_chip = nand_select_chip;
if (!chip->read_byte)
chip->read_byte = busw ? nand_read_byte16 : nand_read_byte;
if (!chip->read_word)
chip->read_word = nand_read_word;
if (!chip->block_bad)
chip->block_bad = nand_block_bad;
if (!chip->block_markbad)
chip->block_markbad = nand_default_block_markbad;
if (!chip->write_buf)
chip->write_buf = busw ? nand_write_buf16 : nand_write_buf;
if (!chip->read_buf)
chip->read_buf = busw ? nand_read_buf16 : nand_read_buf;
if (!chip->verify_buf)
chip->verify_buf = busw ? nand_verify_buf16 : nand_verify_buf;
if (!chip->scan_bbt)
chip->scan_bbt = nand_default_bbt;
if (!chip->controller) {
chip->controller = &chip->hwcontrol;
spin_lock_init(&chip->controller->lock);
init_waitqueue_head(&chip->controller->wq);
}
}
/*
* Get the flash and manufacturer id and lookup if the type is supported
*/
static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
struct nand_chip *chip,
int busw, int *maf_id)
{
struct nand_flash_dev *type = NULL;
int i, dev_id, maf_idx;
/* Select the device */
chip->select_chip(mtd, 0);
/* Send the command for reading device ID */
chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
/* Read manufacturer and device IDs */
*maf_id = chip->read_byte(mtd);
dev_id = chip->read_byte(mtd);
/* Lookup the flash id */
for (i = 0; nand_flash_ids[i].name != NULL; i++) {
if (dev_id == nand_flash_ids[i].id) {
type = &nand_flash_ids[i];
break;
}
}
if (!type)
return ERR_PTR(-ENODEV);
if (!mtd->name)
mtd->name = type->name;
chip->chipsize = type->chipsize << 20;
/* Newer devices have all the information in additional id bytes */
if (!type->pagesize) {
int extid;
/* The 3rd id byte contains non relevant data ATM */
extid = chip->read_byte(mtd);
/* The 4th id byte is the important one */
extid = chip->read_byte(mtd);
/* Calc pagesize */
mtd->writesize = 1024 << (extid & 0x3);
extid >>= 2;
/* Calc oobsize */
mtd->oobsize = (8 << (extid & 0x01)) * (mtd->writesize >> 9);
extid >>= 2;
/* Calc blocksize. Blocksize is multiples of 64KiB */
mtd->erasesize = (64 * 1024) << (extid & 0x03);
extid >>= 2;
/* Get buswidth information */
busw = (extid & 0x01) ? NAND_BUSWIDTH_16 : 0;
} else {
/*
* Old devices have chip data hardcoded in the device id table
*/
mtd->erasesize = type->erasesize;
mtd->writesize = type->pagesize;
mtd->oobsize = mtd->writesize / 32;
busw = type->options & NAND_BUSWIDTH_16;
}
/* Try to identify manufacturer */
for (maf_idx = 0; nand_manuf_ids[maf_idx].id != 0x0; maf_idx++) {
if (nand_manuf_ids[maf_idx].id == *maf_id)
break;
}
/*
* Check, if buswidth is correct. Hardware drivers should set
* chip correct !
*/
if (busw != (chip->options & NAND_BUSWIDTH_16)) {
printk(KERN_INFO "NAND device: Manufacturer ID:"
" 0x%02x, Chip ID: 0x%02x (%s %s)\n", *maf_id,
dev_id, nand_manuf_ids[maf_idx].name, mtd->name);
printk(KERN_WARNING "NAND bus width %d instead %d bit\n",
(chip->options & NAND_BUSWIDTH_16) ? 16 : 8,
busw ? 16 : 8);
return ERR_PTR(-EINVAL);
}
/* Calculate the address shift from the page size */
chip->page_shift = ffs(mtd->writesize) - 1;
/* Convert chipsize to number of pages per chip -1. */
chip->pagemask = (chip->chipsize >> chip->page_shift) - 1;
chip->bbt_erase_shift = chip->phys_erase_shift =
ffs(mtd->erasesize) - 1;
chip->chip_shift = ffs(chip->chipsize) - 1;
/* Set the bad block position */
chip->badblockpos = mtd->writesize > 512 ?
NAND_LARGE_BADBLOCK_POS : NAND_SMALL_BADBLOCK_POS;
/* Get chip options, preserve non chip based options */
chip->options &= ~NAND_CHIPOPTIONS_MSK;
chip->options |= type->options & NAND_CHIPOPTIONS_MSK;
/*
* Set chip as a default. Board drivers can override it, if necessary
*/
chip->options |= NAND_NO_AUTOINCR;
/* Check if chip is a not a samsung device. Do not clear the
* options for chips which are not having an extended id.
*/
if (*maf_id != NAND_MFR_SAMSUNG && !type->pagesize)
chip->options &= ~NAND_SAMSUNG_LP_OPTIONS;
/* Check for AND chips with 4 page planes */
if (chip->options & NAND_4PAGE_ARRAY)
chip->erase_cmd = multi_erase_cmd;
else
chip->erase_cmd = single_erase_cmd;
/* Do not replace user supplied command function ! */
if (mtd->writesize > 512 && chip->cmdfunc == nand_command)
chip->cmdfunc = nand_command_lp;
printk(KERN_INFO "NAND device: Manufacturer ID:"
" 0x%02x, Chip ID: 0x%02x (%s %s)\n", *maf_id, dev_id,
nand_manuf_ids[maf_idx].name, type->name);
return type;
}
/* module_text_address() isn't exported, and it's mostly a pointless
test if this is a module _anyway_ -- they'd have to try _really_ hard
to call us from in-kernel code if the core NAND support is modular. */
#ifdef MODULE
#define caller_is_module() (1)
#else
#define caller_is_module() \
module_text_address((unsigned long)__builtin_return_address(0))
#endif
/**
* nand_scan - [NAND Interface] Scan for the NAND device
* @mtd: MTD device structure
* @maxchips: Number of chips to scan for
*
* This fills out all the uninitialized function pointers
* with the defaults.
* The flash ID is read and the mtd/chip structures are
* filled with the appropriate values.
* The mtd->owner field must be set to the module of the caller
*
*/
int nand_scan(struct mtd_info *mtd, int maxchips)
{
int i, busw, nand_maf_id;
struct nand_chip *chip = mtd->priv;
struct nand_flash_dev *type;
/* Many callers got this wrong, so check for it for a while... */
if (!mtd->owner && caller_is_module()) {
printk(KERN_CRIT "nand_scan() called with NULL mtd->owner!\n");
BUG();
}
/* Get buswidth to select the correct functions */
busw = chip->options & NAND_BUSWIDTH_16;
/* Set the default functions */
nand_set_defaults(chip, busw);
/* Read the flash type */
type = nand_get_flash_type(mtd, chip, busw, &nand_maf_id);
if (IS_ERR(type)) {
printk(KERN_WARNING "No NAND device found!!!\n");
chip->select_chip(mtd, -1);
return PTR_ERR(type);
}
/* Check for a chip array */
for (i = 1; i < maxchips; i++) {
chip->select_chip(mtd, i);
/* Send the command for reading device ID */
chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
/* Read manufacturer and device IDs */
if (nand_maf_id != chip->read_byte(mtd) ||
type->id != chip->read_byte(mtd))
break;
}
if (i > 1)
printk(KERN_INFO "%d NAND chips detected\n", i);
/* Store the number of chips and calc total size for mtd */
chip->numchips = i;
mtd->size = i * chip->chipsize;
/* Preset the internal oob write buffer */
memset(chip->buffers.oobwbuf, 0xff, mtd->oobsize);
/*
* If no default placement scheme is given, select an appropriate one
*/
if (!chip->ecc.layout) {
switch (mtd->oobsize) {
case 8:
chip->ecc.layout = &nand_oob_8;
break;
case 16:
chip->ecc.layout = &nand_oob_16;
break;
case 64:
chip->ecc.layout = &nand_oob_64;
break;
default:
printk(KERN_WARNING "No oob scheme defined for "
"oobsize %d\n", mtd->oobsize);
BUG();
}
}
/*
* check ECC mode, default to software if 3byte/512byte hardware ECC is
* selected and we have 256 byte pagesize fallback to software ECC
*/
switch (chip->ecc.mode) {
case NAND_ECC_HW:
/* Use standard hwecc read page function ? */
if (!chip->ecc.read_page)
chip->ecc.read_page = nand_read_page_hwecc;
if (!chip->ecc.write_page)
chip->ecc.write_page = nand_write_page_hwecc;
if (!chip->ecc.read_oob)
chip->ecc.read_oob = nand_read_oob_std;
if (!chip->ecc.write_oob)
chip->ecc.write_oob = nand_write_oob_std;
case NAND_ECC_HW_SYNDROME:
if (!chip->ecc.calculate || !chip->ecc.correct ||
!chip->ecc.hwctl) {
printk(KERN_WARNING "No ECC functions supplied, "
"Hardware ECC not possible\n");
BUG();
}
/* Use standard syndrome read/write page function ? */
if (!chip->ecc.read_page)
chip->ecc.read_page = nand_read_page_syndrome;
if (!chip->ecc.write_page)
chip->ecc.write_page = nand_write_page_syndrome;
if (!chip->ecc.read_oob)
chip->ecc.read_oob = nand_read_oob_syndrome;
if (!chip->ecc.write_oob)
chip->ecc.write_oob = nand_write_oob_syndrome;
if (mtd->writesize >= chip->ecc.size)
break;
printk(KERN_WARNING "%d byte HW ECC not possible on "
"%d byte page size, fallback to SW ECC\n",
chip->ecc.size, mtd->writesize);
chip->ecc.mode = NAND_ECC_SOFT;
case NAND_ECC_SOFT:
chip->ecc.calculate = nand_calculate_ecc;
chip->ecc.correct = nand_correct_data;
chip->ecc.read_page = nand_read_page_swecc;
chip->ecc.write_page = nand_write_page_swecc;
chip->ecc.read_oob = nand_read_oob_std;
chip->ecc.write_oob = nand_write_oob_std;
chip->ecc.size = 256;
chip->ecc.bytes = 3;
break;
case NAND_ECC_NONE:
printk(KERN_WARNING "NAND_ECC_NONE selected by board driver. "
"This is not recommended !!\n");
chip->ecc.read_page = nand_read_page_raw;
chip->ecc.write_page = nand_write_page_raw;
chip->ecc.read_oob = nand_read_oob_std;
chip->ecc.write_oob = nand_write_oob_std;
chip->ecc.size = mtd->writesize;
chip->ecc.bytes = 0;
break;
default:
printk(KERN_WARNING "Invalid NAND_ECC_MODE %d\n",
chip->ecc.mode);
BUG();
}
/*
* The number of bytes available for a client to place data into
* the out of band area
*/
chip->ecc.layout->oobavail = 0;
for (i = 0; chip->ecc.layout->oobfree[i].length; i++)
chip->ecc.layout->oobavail +=
chip->ecc.layout->oobfree[i].length;
/*
* Set the number of read / write steps for one page depending on ECC
* mode
*/
chip->ecc.steps = mtd->writesize / chip->ecc.size;
if(chip->ecc.steps * chip->ecc.size != mtd->writesize) {
printk(KERN_WARNING "Invalid ecc parameters\n");
BUG();
}
chip->ecc.total = chip->ecc.steps * chip->ecc.bytes;
/* Initialize state */
chip->state = FL_READY;
/* De-select the device */
chip->select_chip(mtd, -1);
/* Invalidate the pagebuffer reference */
chip->pagebuf = -1;
/* Fill in remaining MTD driver data */
mtd->type = MTD_NANDFLASH;
mtd->flags = MTD_CAP_NANDFLASH;
mtd->ecctype = MTD_ECC_SW;
mtd->erase = nand_erase;
mtd->point = NULL;
mtd->unpoint = NULL;
mtd->read = nand_read;
mtd->write = nand_write;
mtd->read_oob = nand_read_oob;
mtd->write_oob = nand_write_oob;
mtd->sync = nand_sync;
mtd->lock = NULL;
mtd->unlock = NULL;
mtd->suspend = nand_suspend;
mtd->resume = nand_resume;
mtd->block_isbad = nand_block_isbad;
mtd->block_markbad = nand_block_markbad;
/* propagate ecc.layout to mtd_info */
mtd->ecclayout = chip->ecc.layout;
/* Check, if we should skip the bad block table scan */
if (chip->options & NAND_SKIP_BBTSCAN)
return 0;
/* Build bad block table */
return chip->scan_bbt(mtd);
}
/**
* nand_release - [NAND Interface] Free resources held by the NAND device
* @mtd: MTD device structure
*/
void nand_release(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd->priv;
#ifdef CONFIG_MTD_PARTITIONS
/* Deregister partitions */
del_mtd_partitions(mtd);
#endif
/* Deregister the device */
del_mtd_device(mtd);
/* Free bad block table memory */
kfree(chip->bbt);
}
EXPORT_SYMBOL_GPL(nand_scan);
EXPORT_SYMBOL_GPL(nand_release);
static int __init nand_base_init(void)
{
led_trigger_register_simple("nand-disk", &nand_led_trigger);
return 0;
}
static void __exit nand_base_exit(void)
{
led_trigger_unregister_simple(nand_led_trigger);
}
module_init(nand_base_init);
module_exit(nand_base_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Steven J. Hill <sjhill@realitydiluted.com>, Thomas Gleixner <tglx@linutronix.de>");
MODULE_DESCRIPTION("Generic NAND flash driver code");
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