06a7643cd3
When we mark block bad we have to get chip because this involves writing to the page's OOB. We hit this bug in UBI - we observed random obscure crashes when it marks block bad from the background thread and there is some parallel task which utilizes flash. This patch also adds a TODO note about BBT table protection which it seems does not exist. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2680 lines
68 KiB
C
2680 lines
68 KiB
C
/*
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* drivers/mtd/nand.c
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*
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* Overview:
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* This is the generic MTD driver for NAND flash devices. It should be
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* capable of working with almost all NAND chips currently available.
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* Basic support for AG-AND chips is provided.
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*
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* Additional technical information is available on
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* http://www.linux-mtd.infradead.org/tech/nand.html
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*
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* Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
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* 2002-2006 Thomas Gleixner (tglx@linutronix.de)
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*
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* Credits:
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* David Woodhouse for adding multichip support
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*
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* Aleph One Ltd. and Toby Churchill Ltd. for supporting the
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* rework for 2K page size chips
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*
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* TODO:
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* Enable cached programming for 2k page size chips
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* Check, if mtd->ecctype should be set to MTD_ECC_HW
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* if we have HW ecc support.
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* The AG-AND chips have nice features for speed improvement,
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* which are not supported yet. Read / program 4 pages in one go.
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* BBT table is not serialized, has to be fixed
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/nand.h>
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#include <linux/mtd/nand_ecc.h>
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#include <linux/mtd/compatmac.h>
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#include <linux/interrupt.h>
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#include <linux/bitops.h>
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#include <linux/leds.h>
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#include <asm/io.h>
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#ifdef CONFIG_MTD_PARTITIONS
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#include <linux/mtd/partitions.h>
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#endif
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/* Define default oob placement schemes for large and small page devices */
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static struct nand_ecclayout nand_oob_8 = {
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.eccbytes = 3,
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.eccpos = {0, 1, 2},
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.oobfree = {
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{.offset = 3,
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.length = 2},
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{.offset = 6,
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.length = 2}}
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};
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static struct nand_ecclayout nand_oob_16 = {
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.eccbytes = 6,
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.eccpos = {0, 1, 2, 3, 6, 7},
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.oobfree = {
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{.offset = 8,
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. length = 8}}
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};
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static struct nand_ecclayout nand_oob_64 = {
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.eccbytes = 24,
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.eccpos = {
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40, 41, 42, 43, 44, 45, 46, 47,
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48, 49, 50, 51, 52, 53, 54, 55,
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56, 57, 58, 59, 60, 61, 62, 63},
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.oobfree = {
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{.offset = 2,
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.length = 38}}
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};
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static int nand_get_device(struct nand_chip *chip, struct mtd_info *mtd,
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int new_state);
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static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
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struct mtd_oob_ops *ops);
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/*
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* For devices which display every fart in the system on a seperate LED. Is
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* compiled away when LED support is disabled.
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*/
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DEFINE_LED_TRIGGER(nand_led_trigger);
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/**
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* nand_release_device - [GENERIC] release chip
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* @mtd: MTD device structure
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*
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* Deselect, release chip lock and wake up anyone waiting on the device
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*/
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static void nand_release_device(struct mtd_info *mtd)
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{
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struct nand_chip *chip = mtd->priv;
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/* De-select the NAND device */
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chip->select_chip(mtd, -1);
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/* Release the controller and the chip */
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spin_lock(&chip->controller->lock);
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chip->controller->active = NULL;
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chip->state = FL_READY;
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wake_up(&chip->controller->wq);
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spin_unlock(&chip->controller->lock);
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}
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/**
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* nand_read_byte - [DEFAULT] read one byte from the chip
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* @mtd: MTD device structure
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*
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* Default read function for 8bit buswith
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*/
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static uint8_t nand_read_byte(struct mtd_info *mtd)
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{
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struct nand_chip *chip = mtd->priv;
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return readb(chip->IO_ADDR_R);
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}
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/**
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* nand_read_byte16 - [DEFAULT] read one byte endianess aware from the chip
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* @mtd: MTD device structure
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*
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* Default read function for 16bit buswith with
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* endianess conversion
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*/
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static uint8_t nand_read_byte16(struct mtd_info *mtd)
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{
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struct nand_chip *chip = mtd->priv;
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return (uint8_t) cpu_to_le16(readw(chip->IO_ADDR_R));
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}
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/**
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* nand_read_word - [DEFAULT] read one word from the chip
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* @mtd: MTD device structure
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*
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* Default read function for 16bit buswith without
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* endianess conversion
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*/
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static u16 nand_read_word(struct mtd_info *mtd)
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{
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struct nand_chip *chip = mtd->priv;
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return readw(chip->IO_ADDR_R);
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}
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/**
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* nand_select_chip - [DEFAULT] control CE line
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* @mtd: MTD device structure
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* @chipnr: chipnumber to select, -1 for deselect
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*
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* Default select function for 1 chip devices.
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*/
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static void nand_select_chip(struct mtd_info *mtd, int chipnr)
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{
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struct nand_chip *chip = mtd->priv;
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switch (chipnr) {
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case -1:
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chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE);
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break;
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case 0:
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break;
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default:
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BUG();
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}
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}
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/**
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* nand_write_buf - [DEFAULT] write buffer to chip
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* @mtd: MTD device structure
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* @buf: data buffer
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* @len: number of bytes to write
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*
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* Default write function for 8bit buswith
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*/
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static void nand_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
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{
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int i;
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struct nand_chip *chip = mtd->priv;
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for (i = 0; i < len; i++)
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writeb(buf[i], chip->IO_ADDR_W);
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}
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/**
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* nand_read_buf - [DEFAULT] read chip data into buffer
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* @mtd: MTD device structure
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* @buf: buffer to store date
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* @len: number of bytes to read
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*
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* Default read function for 8bit buswith
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*/
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static void nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
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{
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int i;
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struct nand_chip *chip = mtd->priv;
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for (i = 0; i < len; i++)
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buf[i] = readb(chip->IO_ADDR_R);
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}
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/**
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* nand_verify_buf - [DEFAULT] Verify chip data against buffer
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* @mtd: MTD device structure
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* @buf: buffer containing the data to compare
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* @len: number of bytes to compare
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*
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* Default verify function for 8bit buswith
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*/
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static int nand_verify_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
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{
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int i;
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struct nand_chip *chip = mtd->priv;
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for (i = 0; i < len; i++)
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if (buf[i] != readb(chip->IO_ADDR_R))
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return -EFAULT;
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return 0;
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}
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/**
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* nand_write_buf16 - [DEFAULT] write buffer to chip
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* @mtd: MTD device structure
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* @buf: data buffer
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* @len: number of bytes to write
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*
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* Default write function for 16bit buswith
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*/
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static void nand_write_buf16(struct mtd_info *mtd, const uint8_t *buf, int len)
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{
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int i;
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struct nand_chip *chip = mtd->priv;
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u16 *p = (u16 *) buf;
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len >>= 1;
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for (i = 0; i < len; i++)
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writew(p[i], chip->IO_ADDR_W);
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}
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/**
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* nand_read_buf16 - [DEFAULT] read chip data into buffer
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* @mtd: MTD device structure
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* @buf: buffer to store date
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* @len: number of bytes to read
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*
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* Default read function for 16bit buswith
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*/
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static void nand_read_buf16(struct mtd_info *mtd, uint8_t *buf, int len)
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{
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int i;
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struct nand_chip *chip = mtd->priv;
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u16 *p = (u16 *) buf;
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len >>= 1;
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for (i = 0; i < len; i++)
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p[i] = readw(chip->IO_ADDR_R);
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}
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/**
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* nand_verify_buf16 - [DEFAULT] Verify chip data against buffer
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* @mtd: MTD device structure
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* @buf: buffer containing the data to compare
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* @len: number of bytes to compare
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*
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* Default verify function for 16bit buswith
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*/
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static int nand_verify_buf16(struct mtd_info *mtd, const uint8_t *buf, int len)
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{
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int i;
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struct nand_chip *chip = mtd->priv;
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u16 *p = (u16 *) buf;
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len >>= 1;
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for (i = 0; i < len; i++)
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if (p[i] != readw(chip->IO_ADDR_R))
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return -EFAULT;
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return 0;
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}
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/**
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* nand_block_bad - [DEFAULT] Read bad block marker from the chip
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* @mtd: MTD device structure
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* @ofs: offset from device start
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* @getchip: 0, if the chip is already selected
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*
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* Check, if the block is bad.
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*/
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static int nand_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip)
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{
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int page, chipnr, res = 0;
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struct nand_chip *chip = mtd->priv;
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u16 bad;
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page = (int)(ofs >> chip->page_shift) & chip->pagemask;
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if (getchip) {
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chipnr = (int)(ofs >> chip->chip_shift);
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nand_get_device(chip, mtd, FL_READING);
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/* Select the NAND device */
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chip->select_chip(mtd, chipnr);
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}
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if (chip->options & NAND_BUSWIDTH_16) {
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chip->cmdfunc(mtd, NAND_CMD_READOOB, chip->badblockpos & 0xFE,
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page);
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bad = cpu_to_le16(chip->read_word(mtd));
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if (chip->badblockpos & 0x1)
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bad >>= 8;
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if ((bad & 0xFF) != 0xff)
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res = 1;
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} else {
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chip->cmdfunc(mtd, NAND_CMD_READOOB, chip->badblockpos, page);
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if (chip->read_byte(mtd) != 0xff)
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res = 1;
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}
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if (getchip)
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nand_release_device(mtd);
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return res;
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}
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/**
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* nand_default_block_markbad - [DEFAULT] mark a block bad
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* @mtd: MTD device structure
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* @ofs: offset from device start
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*
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* This is the default implementation, which can be overridden by
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* a hardware specific driver.
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*/
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static int nand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
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{
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struct nand_chip *chip = mtd->priv;
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uint8_t buf[2] = { 0, 0 };
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int block, ret;
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/* Get block number */
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block = (int)(ofs >> chip->bbt_erase_shift);
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if (chip->bbt)
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chip->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
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/* Do we have a flash based bad block table ? */
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if (chip->options & NAND_USE_FLASH_BBT)
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ret = nand_update_bbt(mtd, ofs);
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else {
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/* We write two bytes, so we dont have to mess with 16 bit
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* access
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*/
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nand_get_device(chip, mtd, FL_WRITING);
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ofs += mtd->oobsize;
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chip->ops.len = chip->ops.ooblen = 2;
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chip->ops.datbuf = NULL;
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chip->ops.oobbuf = buf;
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chip->ops.ooboffs = chip->badblockpos & ~0x01;
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ret = nand_do_write_oob(mtd, ofs, &chip->ops);
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nand_release_device(mtd);
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}
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if (!ret)
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mtd->ecc_stats.badblocks++;
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return ret;
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}
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/**
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* nand_check_wp - [GENERIC] check if the chip is write protected
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* @mtd: MTD device structure
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* Check, if the device is write protected
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*
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* The function expects, that the device is already selected
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*/
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static int nand_check_wp(struct mtd_info *mtd)
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{
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struct nand_chip *chip = mtd->priv;
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/* Check the WP bit */
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chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
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return (chip->read_byte(mtd) & NAND_STATUS_WP) ? 0 : 1;
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}
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/**
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* nand_block_checkbad - [GENERIC] Check if a block is marked bad
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* @mtd: MTD device structure
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* @ofs: offset from device start
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* @getchip: 0, if the chip is already selected
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* @allowbbt: 1, if its allowed to access the bbt area
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*
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* Check, if the block is bad. Either by reading the bad block table or
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* calling of the scan function.
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*/
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static int nand_block_checkbad(struct mtd_info *mtd, loff_t ofs, int getchip,
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int allowbbt)
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{
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struct nand_chip *chip = mtd->priv;
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if (!chip->bbt)
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return chip->block_bad(mtd, ofs, getchip);
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/* Return info from the table */
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return nand_isbad_bbt(mtd, ofs, allowbbt);
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}
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/*
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* Wait for the ready pin, after a command
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* The timeout is catched later.
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*/
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void nand_wait_ready(struct mtd_info *mtd)
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{
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struct nand_chip *chip = mtd->priv;
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unsigned long timeo = jiffies + 2;
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led_trigger_event(nand_led_trigger, LED_FULL);
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/* wait until command is processed or timeout occures */
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do {
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if (chip->dev_ready(mtd))
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break;
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touch_softlockup_watchdog();
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} while (time_before(jiffies, timeo));
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led_trigger_event(nand_led_trigger, LED_OFF);
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}
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EXPORT_SYMBOL_GPL(nand_wait_ready);
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/**
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* nand_command - [DEFAULT] Send command to NAND device
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* @mtd: MTD device structure
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* @command: the command to be sent
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* @column: the column address for this command, -1 if none
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* @page_addr: the page address for this command, -1 if none
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*
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* Send command to NAND device. This function is used for small page
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* devices (256/512 Bytes per page)
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*/
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static void nand_command(struct mtd_info *mtd, unsigned int command,
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int column, int page_addr)
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{
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register struct nand_chip *chip = mtd->priv;
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int ctrl = NAND_CTRL_CLE | NAND_CTRL_CHANGE;
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|
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/*
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* Write out the command to the device.
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*/
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if (command == NAND_CMD_SEQIN) {
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int readcmd;
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if (column >= mtd->writesize) {
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/* OOB area */
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column -= mtd->writesize;
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readcmd = NAND_CMD_READOOB;
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} else if (column < 256) {
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/* First 256 bytes --> READ0 */
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readcmd = NAND_CMD_READ0;
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} else {
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column -= 256;
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readcmd = NAND_CMD_READ1;
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}
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chip->cmd_ctrl(mtd, readcmd, ctrl);
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ctrl &= ~NAND_CTRL_CHANGE;
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}
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chip->cmd_ctrl(mtd, command, ctrl);
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/*
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* Address cycle, when necessary
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|
*/
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ctrl = NAND_CTRL_ALE | NAND_CTRL_CHANGE;
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/* Serially input address */
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if (column != -1) {
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/* Adjust columns for 16 bit buswidth */
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if (chip->options & NAND_BUSWIDTH_16)
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column >>= 1;
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chip->cmd_ctrl(mtd, column, ctrl);
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ctrl &= ~NAND_CTRL_CHANGE;
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}
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if (page_addr != -1) {
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chip->cmd_ctrl(mtd, page_addr, ctrl);
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ctrl &= ~NAND_CTRL_CHANGE;
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chip->cmd_ctrl(mtd, page_addr >> 8, ctrl);
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/* One more address cycle for devices > 32MiB */
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if (chip->chipsize > (32 << 20))
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chip->cmd_ctrl(mtd, page_addr >> 16, ctrl);
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}
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chip->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
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|
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/*
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* program and erase have their own busy handlers
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* status and sequential in needs no delay
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*/
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switch (command) {
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|
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case NAND_CMD_PAGEPROG:
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case NAND_CMD_ERASE1:
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case NAND_CMD_ERASE2:
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case NAND_CMD_SEQIN:
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case NAND_CMD_STATUS:
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return;
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|
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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;
|
|
|
|
chip->ecc.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
|
|
* @len: size of oob to transfer
|
|
*/
|
|
static uint8_t *nand_transfer_oob(struct nand_chip *chip, uint8_t *oob,
|
|
struct mtd_oob_ops *ops, size_t len)
|
|
{
|
|
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;
|
|
uint32_t oobreadlen = ops->ooblen;
|
|
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));
|
|
|
|
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 */
|
|
if (unlikely(ops->mode == MTD_OOB_RAW))
|
|
ret = chip->ecc.read_page_raw(mtd, chip, bufpoi);
|
|
else
|
|
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) {
|
|
int toread = min(oobreadlen,
|
|
chip->ecc.layout->oobavail);
|
|
if (toread) {
|
|
oob = nand_transfer_oob(chip,
|
|
oob, ops, toread);
|
|
oobreadlen -= toread;
|
|
}
|
|
} else
|
|
buf = nand_transfer_oob(chip,
|
|
buf, ops, mtd->oobsize);
|
|
}
|
|
|
|
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 (oob)
|
|
ops->oobretlen = ops->ooblen - oobreadlen;
|
|
|
|
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->ooblen;
|
|
int len;
|
|
uint8_t *buf = ops->oobbuf;
|
|
|
|
DEBUG(MTD_DEBUG_LEVEL3, "nand_read_oob: from = 0x%08Lx, len = %i\n",
|
|
(unsigned long long)from, readlen);
|
|
|
|
if (ops->mode == MTD_OOB_AUTO)
|
|
len = chip->ecc.layout->oobavail;
|
|
else
|
|
len = mtd->oobsize;
|
|
|
|
if (unlikely(ops->ooboffs >= len)) {
|
|
DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: "
|
|
"Attempt to start read outside oob\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Do not allow reads past end of device */
|
|
if (unlikely(from >= mtd->size ||
|
|
ops->ooboffs + readlen > ((mtd->size >> chip->page_shift) -
|
|
(from >> chip->page_shift)) * len)) {
|
|
DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: "
|
|
"Attempt read beyond end of device\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
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;
|
|
|
|
while(1) {
|
|
sndcmd = chip->ecc.read_oob(mtd, chip, page, sndcmd);
|
|
|
|
len = min(len, readlen);
|
|
buf = nand_transfer_oob(chip, buf, ops, len);
|
|
|
|
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 -= len;
|
|
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->oobretlen = ops->ooblen;
|
|
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)
|
|
{
|
|
struct nand_chip *chip = mtd->priv;
|
|
int ret = -ENOTSUPP;
|
|
|
|
ops->retlen = 0;
|
|
|
|
/* Do not allow reads past end of device */
|
|
if (ops->datbuf && (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:
|
|
case MTD_OOB_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);
|
|
|
|
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];
|
|
|
|
chip->ecc.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 - [REPLACEABLE] write one page
|
|
* @mtd: MTD device structure
|
|
* @chip: NAND chip descriptor
|
|
* @buf: the data to write
|
|
* @page: page number to write
|
|
* @cached: cached programming
|
|
* @raw: use _raw version of write_page
|
|
*/
|
|
static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
|
|
const uint8_t *buf, int page, int cached, int raw)
|
|
{
|
|
int status;
|
|
|
|
chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
|
|
|
|
if (unlikely(raw))
|
|
chip->ecc.write_page_raw(mtd, chip, buf);
|
|
else
|
|
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 & (chip->subpagesize - 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, column;
|
|
struct nand_chip *chip = mtd->priv;
|
|
uint32_t writelen = ops->len;
|
|
uint8_t *oob = ops->oobbuf;
|
|
uint8_t *buf = ops->datbuf;
|
|
int ret, subpage;
|
|
|
|
ops->retlen = 0;
|
|
if (!writelen)
|
|
return 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;
|
|
}
|
|
|
|
column = to & (mtd->writesize - 1);
|
|
subpage = column || (writelen & (mtd->writesize - 1));
|
|
|
|
if (subpage && oob)
|
|
return -EINVAL;
|
|
|
|
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;
|
|
|
|
/* If we're not given explicit OOB data, let it be 0xFF */
|
|
if (likely(!oob))
|
|
memset(chip->oob_poi, 0xff, mtd->oobsize);
|
|
|
|
while(1) {
|
|
int bytes = mtd->writesize;
|
|
int cached = writelen > bytes && page != blockmask;
|
|
uint8_t *wbuf = buf;
|
|
|
|
/* Partial page write ? */
|
|
if (unlikely(column || writelen < (mtd->writesize - 1))) {
|
|
cached = 0;
|
|
bytes = min_t(int, bytes - column, (int) writelen);
|
|
chip->pagebuf = -1;
|
|
memset(chip->buffers->databuf, 0xff, mtd->writesize);
|
|
memcpy(&chip->buffers->databuf[column], buf, bytes);
|
|
wbuf = chip->buffers->databuf;
|
|
}
|
|
|
|
if (unlikely(oob))
|
|
oob = nand_fill_oob(chip, oob, ops);
|
|
|
|
ret = chip->write_page(mtd, chip, wbuf, page, cached,
|
|
(ops->mode == MTD_OOB_RAW));
|
|
if (ret)
|
|
break;
|
|
|
|
writelen -= bytes;
|
|
if (!writelen)
|
|
break;
|
|
|
|
column = 0;
|
|
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);
|
|
}
|
|
}
|
|
|
|
ops->retlen = ops->len - writelen;
|
|
if (unlikely(oob))
|
|
ops->oobretlen = ops->ooblen;
|
|
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, len;
|
|
struct nand_chip *chip = mtd->priv;
|
|
|
|
DEBUG(MTD_DEBUG_LEVEL3, "nand_write_oob: to = 0x%08x, len = %i\n",
|
|
(unsigned int)to, (int)ops->ooblen);
|
|
|
|
if (ops->mode == MTD_OOB_AUTO)
|
|
len = chip->ecc.layout->oobavail;
|
|
else
|
|
len = mtd->oobsize;
|
|
|
|
/* Do not allow write past end of page */
|
|
if ((ops->ooboffs + ops->ooblen) > len) {
|
|
DEBUG(MTD_DEBUG_LEVEL0, "nand_write_oob: "
|
|
"Attempt to write past end of page\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (unlikely(ops->ooboffs >= len)) {
|
|
DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: "
|
|
"Attempt to start write outside oob\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Do not allow reads past end of device */
|
|
if (unlikely(to >= mtd->size ||
|
|
ops->ooboffs + ops->ooblen >
|
|
((mtd->size >> chip->page_shift) -
|
|
(to >> chip->page_shift)) * len)) {
|
|
DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: "
|
|
"Attempt write beyond end of device\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;
|
|
|
|
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->oobretlen = ops->ooblen;
|
|
|
|
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)
|
|
{
|
|
struct nand_chip *chip = mtd->priv;
|
|
int ret = -ENOTSUPP;
|
|
|
|
ops->retlen = 0;
|
|
|
|
/* Do not allow writes past end of device */
|
|
if (ops->datbuf && (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:
|
|
case MTD_OOB_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);
|
|
|
|
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 holds MLC / multichip data */
|
|
chip->cellinfo = 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;
|
|
}
|
|
|
|
/**
|
|
* nand_scan_ident - [NAND Interface] Scan for the NAND device
|
|
* @mtd: MTD device structure
|
|
* @maxchips: Number of chips to scan for
|
|
*
|
|
* This is the first phase of the normal nand_scan() function. It
|
|
* reads the flash ID and sets up MTD fields accordingly.
|
|
*
|
|
* The mtd->owner field must be set to the module of the caller.
|
|
*/
|
|
int nand_scan_ident(struct mtd_info *mtd, int maxchips)
|
|
{
|
|
int i, busw, nand_maf_id;
|
|
struct nand_chip *chip = mtd->priv;
|
|
struct nand_flash_dev *type;
|
|
|
|
/* 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;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* nand_scan_tail - [NAND Interface] Scan for the NAND device
|
|
* @mtd: MTD device structure
|
|
* @maxchips: Number of chips to scan for
|
|
*
|
|
* This is the second phase of the normal nand_scan() function. It
|
|
* fills out all the uninitialized function pointers with the defaults
|
|
* and scans for a bad block table if appropriate.
|
|
*/
|
|
int nand_scan_tail(struct mtd_info *mtd)
|
|
{
|
|
int i;
|
|
struct nand_chip *chip = mtd->priv;
|
|
|
|
if (!(chip->options & NAND_OWN_BUFFERS))
|
|
chip->buffers = kmalloc(sizeof(*chip->buffers), GFP_KERNEL);
|
|
if (!chip->buffers)
|
|
return -ENOMEM;
|
|
|
|
/* Set the internal oob buffer location, just after the page data */
|
|
chip->oob_poi = chip->buffers->databuf + mtd->writesize;
|
|
|
|
/*
|
|
* 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();
|
|
}
|
|
}
|
|
|
|
if (!chip->write_page)
|
|
chip->write_page = nand_write_page;
|
|
|
|
/*
|
|
* check ECC mode, default to software if 3byte/512byte hardware ECC is
|
|
* selected and we have 256 byte pagesize fallback to software ECC
|
|
*/
|
|
if (!chip->ecc.read_page_raw)
|
|
chip->ecc.read_page_raw = nand_read_page_raw;
|
|
if (!chip->ecc.write_page_raw)
|
|
chip->ecc.write_page_raw = nand_write_page_raw;
|
|
|
|
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;
|
|
mtd->oobavail = chip->ecc.layout->oobavail;
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/*
|
|
* Allow subpage writes up to ecc.steps. Not possible for MLC
|
|
* FLASH.
|
|
*/
|
|
if (!(chip->options & NAND_NO_SUBPAGE_WRITE) &&
|
|
!(chip->cellinfo & NAND_CI_CELLTYPE_MSK)) {
|
|
switch(chip->ecc.steps) {
|
|
case 2:
|
|
mtd->subpage_sft = 1;
|
|
break;
|
|
case 4:
|
|
case 8:
|
|
mtd->subpage_sft = 2;
|
|
break;
|
|
}
|
|
}
|
|
chip->subpagesize = mtd->writesize >> mtd->subpage_sft;
|
|
|
|
/* 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->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);
|
|
}
|
|
|
|
/* 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 ret;
|
|
|
|
/* 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();
|
|
}
|
|
|
|
ret = nand_scan_ident(mtd, maxchips);
|
|
if (!ret)
|
|
ret = nand_scan_tail(mtd);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
if (!(chip->options & NAND_OWN_BUFFERS))
|
|
kfree(chip->buffers);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(nand_scan);
|
|
EXPORT_SYMBOL_GPL(nand_scan_ident);
|
|
EXPORT_SYMBOL_GPL(nand_scan_tail);
|
|
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");
|