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[LV-kern-commit] CVS: kernel-2.4/drivers/mtd/nand Config.in,NONE,1.1 Makefile,NONE,1.1 nand.c,NONE,1.1 nand_ecc.c,NONE,1.1 spia.c,NONE,1.1
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From: Andy P. <at...@us...> - 2002-04-10 19:00:34
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Update of /cvsroot/linux-vax/kernel-2.4/drivers/mtd/nand
In directory usw-pr-cvs1:/tmp/cvs-serv22769/mtd/nand
Added Files:
Config.in Makefile nand.c nand_ecc.c spia.c
Log Message:
synch 2.4.15 commit 42
--- NEW FILE ---
# drivers/mtd/nand/Config.in
# $Id: Config.in,v 1.1 2002/04/10 14:57:59 atp Exp $
mainmenu_option next_comment
comment 'NAND Flash Device Drivers'
dep_tristate ' NAND Device Support' CONFIG_MTD_NAND $CONFIG_MTD
if [ "$CONFIG_MTD_NAND" = "y" -o "$CONFIG_MTD_NAND" = "m" ]; then
bool ' Enable ECC correction algorithm' CONFIG_MTD_NAND_ECC
bool ' Verify NAND page writes' CONFIG_MTD_NAND_VERIFY_WRITE
fi
if [ "$CONFIG_ARM" = "y" -a "$CONFIG_ARCH_P720T" = "y" ]; then
dep_tristate ' NAND Flash device on SPIA board' CONFIG_MTD_NAND_SPIA $CONFIG_MTD_NAND
fi
endmenu
--- NEW FILE ---
#
# linux/drivers/nand/Makefile
#
# $Id: Makefile,v 1.1 2002/04/10 14:57:59 atp Exp $
O_TARGET := nandlink.o
export-objs := nand.o nand_ecc.o
nandobjs-y := nand.o
nandobjs-$(CONFIG_MTD_NAND_ECC) += nand_ecc.o
obj-$(CONFIG_MTD_NAND) += $(nandobjs-y)
obj-$(CONFIG_MTD_NAND_SPIA) += spia.o
include $(TOPDIR)/Rules.make
--- NEW FILE ---
/*
* drivers/mtd/nand.c
*
* Copyright (C) 2000 Steven J. Hill (sj...@co...)
*
* $Id: nand.c,v 1.1 2002/04/10 14:57:59 atp Exp $
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Overview:
* This is the generic MTD driver for NAND flash devices. It should be
* capable of working with almost all NAND chips currently available.
*/
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/sched.h>
[...1335 lines suppressed...]
mtd->write_ecc = nand_write_ecc;
mtd->read_oob = nand_read_oob;
mtd->write_oob = nand_write_oob;
mtd->readv = NULL;
mtd->writev = nand_writev;
mtd->sync = nand_sync;
mtd->lock = NULL;
mtd->unlock = NULL;
mtd->suspend = NULL;
mtd->resume = NULL;
/* Return happy */
return 0;
}
EXPORT_SYMBOL(nand_scan);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Steven J. Hill <sj...@co...");
MODULE_DESCRIPTION("Generic NAND flash driver code");
--- NEW FILE ---
/*
* drivers/mtd/nand_ecc.c
*
* Copyright (C) 2000 Steven J. Hill (sj...@co...)
* Toshiba America Electronics Components, Inc.
*
* $Id: nand_ecc.c,v 1.1 2002/04/10 14:57:59 atp Exp $
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This file contains an ECC algorithm from Toshiba that detects and
* corrects 1 bit errors in a 256 byte block of data.
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/module.h>
/*
* Pre-calculated 256-way 1 byte column parity
*/
static const u_char nand_ecc_precalc_table[] = {
0x00, 0x55, 0x56, 0x03, 0x59, 0x0c, 0x0f, 0x5a, 0x5a, 0x0f, 0x0c, 0x59, 0x03, 0x56, 0x55, 0x00,
0x65, 0x30, 0x33, 0x66, 0x3c, 0x69, 0x6a, 0x3f, 0x3f, 0x6a, 0x69, 0x3c, 0x66, 0x33, 0x30, 0x65,
0x66, 0x33, 0x30, 0x65, 0x3f, 0x6a, 0x69, 0x3c, 0x3c, 0x69, 0x6a, 0x3f, 0x65, 0x30, 0x33, 0x66,
0x03, 0x56, 0x55, 0x00, 0x5a, 0x0f, 0x0c, 0x59, 0x59, 0x0c, 0x0f, 0x5a, 0x00, 0x55, 0x56, 0x03,
0x69, 0x3c, 0x3f, 0x6a, 0x30, 0x65, 0x66, 0x33, 0x33, 0x66, 0x65, 0x30, 0x6a, 0x3f, 0x3c, 0x69,
0x0c, 0x59, 0x5a, 0x0f, 0x55, 0x00, 0x03, 0x56, 0x56, 0x03, 0x00, 0x55, 0x0f, 0x5a, 0x59, 0x0c,
0x0f, 0x5a, 0x59, 0x0c, 0x56, 0x03, 0x00, 0x55, 0x55, 0x00, 0x03, 0x56, 0x0c, 0x59, 0x5a, 0x0f,
0x6a, 0x3f, 0x3c, 0x69, 0x33, 0x66, 0x65, 0x30, 0x30, 0x65, 0x66, 0x33, 0x69, 0x3c, 0x3f, 0x6a,
0x6a, 0x3f, 0x3c, 0x69, 0x33, 0x66, 0x65, 0x30, 0x30, 0x65, 0x66, 0x33, 0x69, 0x3c, 0x3f, 0x6a,
0x0f, 0x5a, 0x59, 0x0c, 0x56, 0x03, 0x00, 0x55, 0x55, 0x00, 0x03, 0x56, 0x0c, 0x59, 0x5a, 0x0f,
0x0c, 0x59, 0x5a, 0x0f, 0x55, 0x00, 0x03, 0x56, 0x56, 0x03, 0x00, 0x55, 0x0f, 0x5a, 0x59, 0x0c,
0x69, 0x3c, 0x3f, 0x6a, 0x30, 0x65, 0x66, 0x33, 0x33, 0x66, 0x65, 0x30, 0x6a, 0x3f, 0x3c, 0x69,
0x03, 0x56, 0x55, 0x00, 0x5a, 0x0f, 0x0c, 0x59, 0x59, 0x0c, 0x0f, 0x5a, 0x00, 0x55, 0x56, 0x03,
0x66, 0x33, 0x30, 0x65, 0x3f, 0x6a, 0x69, 0x3c, 0x3c, 0x69, 0x6a, 0x3f, 0x65, 0x30, 0x33, 0x66,
0x65, 0x30, 0x33, 0x66, 0x3c, 0x69, 0x6a, 0x3f, 0x3f, 0x6a, 0x69, 0x3c, 0x66, 0x33, 0x30, 0x65,
0x00, 0x55, 0x56, 0x03, 0x59, 0x0c, 0x0f, 0x5a, 0x5a, 0x0f, 0x0c, 0x59, 0x03, 0x56, 0x55, 0x00
};
/*
* Creates non-inverted ECC code from line parity
*/
static void nand_trans_result(u_char reg2, u_char reg3,
u_char *ecc_code)
{
u_char a, b, i, tmp1, tmp2;
/* Initialize variables */
a = b = 0x80;
tmp1 = tmp2 = 0;
/* Calculate first ECC byte */
for (i = 0; i < 4; i++) {
if (reg3 & a) /* LP15,13,11,9 --> ecc_code[0] */
tmp1 |= b;
b >>= 1;
if (reg2 & a) /* LP14,12,10,8 --> ecc_code[0] */
tmp1 |= b;
b >>= 1;
a >>= 1;
}
/* Calculate second ECC byte */
b = 0x80;
for (i = 0; i < 4; i++) {
if (reg3 & a) /* LP7,5,3,1 --> ecc_code[1] */
tmp2 |= b;
b >>= 1;
if (reg2 & a) /* LP6,4,2,0 --> ecc_code[1] */
tmp2 |= b;
b >>= 1;
a >>= 1;
}
/* Store two of the ECC bytes */
ecc_code[0] = tmp1;
ecc_code[1] = tmp2;
}
/*
* Calculate 3 byte ECC code for 256 byte block
*/
void nand_calculate_ecc (const u_char *dat, u_char *ecc_code)
{
u_char idx, reg1, reg2, reg3;
int j;
/* Initialize variables */
reg1 = reg2 = reg3 = 0;
ecc_code[0] = ecc_code[1] = ecc_code[2] = 0;
/* Build up column parity */
for(j = 0; j < 256; j++) {
/* Get CP0 - CP5 from table */
idx = nand_ecc_precalc_table[dat[j]];
reg1 ^= (idx & 0x3f);
/* All bit XOR = 1 ? */
if (idx & 0x40) {
reg3 ^= (u_char) j;
reg2 ^= ~((u_char) j);
}
}
/* Create non-inverted ECC code from line parity */
nand_trans_result(reg2, reg3, ecc_code);
/* Calculate final ECC code */
ecc_code[0] = ~ecc_code[0];
ecc_code[1] = ~ecc_code[1];
ecc_code[2] = ((~reg1) << 2) | 0x03;
}
/*
* Detect and correct a 1 bit error for 256 byte block
*/
int nand_correct_data (u_char *dat, u_char *read_ecc, u_char *calc_ecc)
{
u_char a, b, c, d1, d2, d3, add, bit, i;
/* Do error detection */
d1 = calc_ecc[0] ^ read_ecc[0];
d2 = calc_ecc[1] ^ read_ecc[1];
d3 = calc_ecc[2] ^ read_ecc[2];
if ((d1 | d2 | d3) == 0) {
/* No errors */
return 0;
}
else {
a = (d1 ^ (d1 >> 1)) & 0x55;
b = (d2 ^ (d2 >> 1)) & 0x55;
c = (d3 ^ (d3 >> 1)) & 0x54;
/* Found and will correct single bit error in the data */
if ((a == 0x55) && (b == 0x55) && (c == 0x54)) {
c = 0x80;
add = 0;
a = 0x80;
for (i=0; i<4; i++) {
if (d1 & c)
add |= a;
c >>= 2;
a >>= 1;
}
c = 0x80;
for (i=0; i<4; i++) {
if (d2 & c)
add |= a;
c >>= 2;
a >>= 1;
}
bit = 0;
b = 0x04;
c = 0x80;
for (i=0; i<3; i++) {
if (d3 & c)
bit |= b;
c >>= 2;
b >>= 1;
}
b = 0x01;
a = dat[add];
a ^= (b << bit);
dat[add] = a;
return 1;
}
else {
i = 0;
while (d1) {
if (d1 & 0x01)
++i;
d1 >>= 1;
}
while (d2) {
if (d2 & 0x01)
++i;
d2 >>= 1;
}
while (d3) {
if (d3 & 0x01)
++i;
d3 >>= 1;
}
if (i == 1) {
/* ECC Code Error Correction */
read_ecc[0] = calc_ecc[0];
read_ecc[1] = calc_ecc[1];
read_ecc[2] = calc_ecc[2];
return 2;
}
else {
/* Uncorrectable Error */
return -1;
}
}
}
/* Should never happen */
return -1;
}
EXPORT_SYMBOL(nand_calculate_ecc);
EXPORT_SYMBOL(nand_correct_data);
--- NEW FILE ---
/*
* drivers/mtd/nand/spia.c
*
* Copyright (C) 2000 Steven J. Hill (sj...@co...)
*
* $Id: spia.c,v 1.1 2002/04/10 14:57:59 atp Exp $
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Overview:
* This is a device driver for the NAND flash device found on the
* SPIA board which utilizes the Toshiba TC58V64AFT part. This is
* a 64Mibit (8MiB x 8 bits) NAND flash device.
*/
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <asm/io.h>
/*
* MTD structure for SPIA board
*/
static struct mtd_info *spia_mtd = NULL;
/*
* Values specific to the SPIA board (used with EP7212 processor)
*/
#define SPIA_IO_ADDR = 0xd0000000 /* Start of EP7212 IO address space */
#define SPIA_FIO_ADDR = 0xf0000000 /* Address where flash is mapped */
#define SPIA_PEDR = 0x0080 /*
* IO offset to Port E data register
* where the CLE, ALE and NCE pins
* are wired to.
*/
#define SPIA_PEDDR = 0x00c0 /*
* IO offset to Port E data direction
* register so we can control the IO
* lines.
*/
/*
* Module stuff
*/
static int spia_io_base = SPIA_IO_BASE;
static int spia_fio_base = SPIA_FIO_BASE;
static int spia_pedr = SPIA_PEDR;
static int spia_peddr = SPIA_PEDDR;
MODULE_PARM(spia_io_base, "i");
MODULE_PARM(spia_fio_base, "i");
MODULE_PARM(spia_pedr, "i");
MODULE_PARM(spia_peddr, "i");
__setup("spia_io_base=",spia_io_base);
__setup("spia_fio_base=",spia_fio_base);
__setup("spia_pedr=",spia_pedr);
__setup("spia_peddr=",spia_peddr);
/*
* Define partitions for flash device
*/
const static struct mtd_partition partition_info[] = {
{ name: "SPIA flash partition 1",
offset: 0,
size: 2*1024*1024 },
{ name: "SPIA flash partition 2",
offset: 2*1024*1024,
size: 6*1024*1024 }
};
#define NUM_PARTITIONS 2
/*
* Main initialization routine
*/
int __init spia_init (void)
{
struct nand_chip *this;
/* Allocate memory for MTD device structure and private data */
spia_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),
GFP_KERNEL);
if (!spia_mtd) {
printk ("Unable to allocate SPIA NAND MTD device structure.\n");
return -ENOMEM;
}
/* Get pointer to private data */
this = (struct nand_chip *) (&spia_mtd[1]);
/* Initialize structures */
memset((char *) spia_mtd, 0, sizeof(struct mtd_info));
memset((char *) this, 0, sizeof(struct nand_chip));
/* Link the private data with the MTD structure */
spia_mtd->priv = this;
/*
* Set GPIO Port E control register so that the pins are configured
* to be outputs for controlling the NAND flash.
*/
(*(volatile unsigned char *) (spia_io_base + spia_peddr)) = 0x07;
/* Set address of NAND IO lines */
this->IO_ADDR = spia_fio_base;
this->CTRL_ADDR = spia_io_base + spia_pedr;
this->CLE = 0x01;
this->ALE = 0x02;
this->NCE = 0x04;
/* Scan to find existance of the device */
if (nand_scan (spia_mtd)) {
kfree (spia_mtd);
return -ENXIO;
}
/* Allocate memory for internal data buffer */
this->data_buf = kmalloc (sizeof(u_char) * (spia_mtd->oobblock + spia_mtd->oobsize), GFP_KERNEL);
if (!this->data_buf) {
printk ("Unable to allocate NAND data buffer for SPIA.\n");
kfree (spia_mtd);
return -ENOMEM;
}
/* Register the partitions */
add_mtd_partitions(spia_mtd, partition_info, NUM_PARTITIONS);
/* Return happy */
return 0;
}
module_init(spia_init);
/*
* Clean up routine
*/
#ifdef MODULE
static void __exit spia_cleanup (void)
{
struct nand_chip *this = (struct nand_chip *) &spia_mtd[1];
/* Unregister the device */
del_mtd_device (spia_mtd);
/* Free internal data buffer */
kfree (this->data_buf);
/* Free the MTD device structure */
kfree (spia_mtd);
}
module_exit(spia_cleanup);
#endif
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Steven J. Hill <sj...@co...");
MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on SPIA board");
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