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mtd: doc: remove support for DoC 2000/2001/2001+ 

These drivers are deprecated for very long time, and we have a different driver
for these called "diskonchip". Thus, kill the ancient cruft.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Artem Bityutskiy 2013-03-06 09:23:47 +02:00 committed by David Woodhouse
parent 8e12b474f9
commit b5a6c3095f
7 changed files with 0 additions and 3996 deletions
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63
drivers/mtd/devices/Kconfig
View File

@ -205,69 +205,6 @@ config MTD_BLOCK2MTD
comment "Disk-On-Chip Device Drivers"
config MTD_DOC2000
tristate "M-Systems Disk-On-Chip 2000 and Millennium (DEPRECATED)"
depends on MTD_NAND
select MTD_DOCPROBE
select MTD_NAND_IDS
---help---
This provides an MTD device driver for the M-Systems DiskOnChip
2000 and Millennium devices. Originally designed for the DiskOnChip
2000, it also now includes support for the DiskOnChip Millennium.
If you have problems with this driver and the DiskOnChip Millennium,
you may wish to try the alternative Millennium driver below. To use
the alternative driver, you will need to undefine DOC_SINGLE_DRIVER
in the <file:drivers/mtd/devices/docprobe.c> source code.
If you use this device, you probably also want to enable the NFTL
'NAND Flash Translation Layer' option below, which is used to
emulate a block device by using a kind of file system on the flash
chips.
NOTE: This driver is deprecated and will probably be removed soon.
Please try the new DiskOnChip driver under "NAND Flash Device
Drivers".
config MTD_DOC2001
tristate "M-Systems Disk-On-Chip Millennium-only alternative driver (DEPRECATED)"
depends on MTD_NAND
select MTD_DOCPROBE
select MTD_NAND_IDS
---help---
This provides an alternative MTD device driver for the M-Systems
DiskOnChip Millennium devices. Use this if you have problems with
the combined DiskOnChip 2000 and Millennium driver above. To get
the DiskOnChip probe code to load and use this driver instead of
the other one, you will need to undefine DOC_SINGLE_DRIVER near
the beginning of <file:drivers/mtd/devices/docprobe.c>.
If you use this device, you probably also want to enable the NFTL
'NAND Flash Translation Layer' option below, which is used to
emulate a block device by using a kind of file system on the flash
chips.
NOTE: This driver is deprecated and will probably be removed soon.
Please try the new DiskOnChip driver under "NAND Flash Device
Drivers".
config MTD_DOC2001PLUS
tristate "M-Systems Disk-On-Chip Millennium Plus"
depends on MTD_NAND
select MTD_DOCPROBE
select MTD_NAND_IDS
---help---
This provides an MTD device driver for the M-Systems DiskOnChip
Millennium Plus devices.
If you use this device, you probably also want to enable the INFTL
'Inverse NAND Flash Translation Layer' option below, which is used
to emulate a block device by using a kind of file system on the
flash chips.
NOTE: This driver will soon be replaced by the new DiskOnChip driver
under "NAND Flash Device Drivers" (currently that driver does not
support all Millennium Plus devices).
config MTD_DOCG3
tristate "M-Systems Disk-On-Chip G3"
select BCH

5
drivers/mtd/devices/Makefile
View File

@ -2,12 +2,7 @@
# linux/drivers/mtd/devices/Makefile
#
obj-$(CONFIG_MTD_DOC2000) += doc2000.o
obj-$(CONFIG_MTD_DOC2001) += doc2001.o
obj-$(CONFIG_MTD_DOC2001PLUS) += doc2001plus.o
obj-$(CONFIG_MTD_DOCG3) += docg3.o
obj-$(CONFIG_MTD_DOCPROBE) += docprobe.o
obj-$(CONFIG_MTD_DOCECC) += docecc.o
obj-$(CONFIG_MTD_SLRAM) += slram.o
obj-$(CONFIG_MTD_PHRAM) += phram.o
obj-$(CONFIG_MTD_PMC551) += pmc551.o

1178
drivers/mtd/devices/doc2000.c
View File

File diff suppressed because it is too large Load Diff

824
drivers/mtd/devices/doc2001.c
View File

@ -1,824 +0,0 @@
/*
* Linux driver for Disk-On-Chip Millennium
* (c) 1999 Machine Vision Holdings, Inc.
* (c) 1999, 2000 David Woodhouse <dwmw2@infradead.org>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/doc2000.h>
/* #define ECC_DEBUG */
/* I have no idea why some DoC chips can not use memcop_form|to_io().
* This may be due to the different revisions of the ASIC controller built-in or
* simplily a QA/Bug issue. Who knows ?? If you have trouble, please uncomment
* this:*/
#undef USE_MEMCPY
static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf);
static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf);
static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
struct mtd_oob_ops *ops);
static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
struct mtd_oob_ops *ops);
static int doc_erase (struct mtd_info *mtd, struct erase_info *instr);
static struct mtd_info *docmillist = NULL;
/* Perform the required delay cycles by reading from the NOP register */
static void DoC_Delay(void __iomem * docptr, unsigned short cycles)
{
volatile char dummy;
int i;
for (i = 0; i < cycles; i++)
dummy = ReadDOC(docptr, NOP);
}
/* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */
static int _DoC_WaitReady(void __iomem * docptr)
{
unsigned short c = 0xffff;
pr_debug("_DoC_WaitReady called for out-of-line wait\n");
/* Out-of-line routine to wait for chip response */
while (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B) && --c)
;
if (c == 0)
pr_debug("_DoC_WaitReady timed out.\n");
return (c == 0);
}
static inline int DoC_WaitReady(void __iomem * docptr)
{
/* This is inline, to optimise the common case, where it's ready instantly */
int ret = 0;
/* 4 read form NOP register should be issued in prior to the read from CDSNControl
see Software Requirement 11.4 item 2. */
DoC_Delay(docptr, 4);
if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B))
/* Call the out-of-line routine to wait */
ret = _DoC_WaitReady(docptr);
/* issue 2 read from NOP register after reading from CDSNControl register
see Software Requirement 11.4 item 2. */
DoC_Delay(docptr, 2);
return ret;
}
/* DoC_Command: Send a flash command to the flash chip through the CDSN IO register
with the internal pipeline. Each of 4 delay cycles (read from the NOP register) is
required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */
static void DoC_Command(void __iomem * docptr, unsigned char command,
unsigned char xtraflags)
{
/* Assert the CLE (Command Latch Enable) line to the flash chip */
WriteDOC(xtraflags | CDSN_CTRL_CLE | CDSN_CTRL_CE, docptr, CDSNControl);
DoC_Delay(docptr, 4);
/* Send the command */
WriteDOC(command, docptr, Mil_CDSN_IO);
WriteDOC(0x00, docptr, WritePipeTerm);
/* Lower the CLE line */
WriteDOC(xtraflags | CDSN_CTRL_CE, docptr, CDSNControl);
DoC_Delay(docptr, 4);
}
/* DoC_Address: Set the current address for the flash chip through the CDSN IO register
with the internal pipeline. Each of 4 delay cycles (read from the NOP register) is
required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */
static inline void DoC_Address(void __iomem * docptr, int numbytes, unsigned long ofs,
unsigned char xtraflags1, unsigned char xtraflags2)
{
/* Assert the ALE (Address Latch Enable) line to the flash chip */
WriteDOC(xtraflags1 | CDSN_CTRL_ALE | CDSN_CTRL_CE, docptr, CDSNControl);
DoC_Delay(docptr, 4);
/* Send the address */
switch (numbytes)
{
case 1:
/* Send single byte, bits 0-7. */
WriteDOC(ofs & 0xff, docptr, Mil_CDSN_IO);
WriteDOC(0x00, docptr, WritePipeTerm);
break;
case 2:
/* Send bits 9-16 followed by 17-23 */
WriteDOC((ofs >> 9) & 0xff, docptr, Mil_CDSN_IO);
WriteDOC((ofs >> 17) & 0xff, docptr, Mil_CDSN_IO);
WriteDOC(0x00, docptr, WritePipeTerm);
break;
case 3:
/* Send 0-7, 9-16, then 17-23 */
WriteDOC(ofs & 0xff, docptr, Mil_CDSN_IO);
WriteDOC((ofs >> 9) & 0xff, docptr, Mil_CDSN_IO);
WriteDOC((ofs >> 17) & 0xff, docptr, Mil_CDSN_IO);
WriteDOC(0x00, docptr, WritePipeTerm);
break;
default:
return;
}
/* Lower the ALE line */
WriteDOC(xtraflags1 | xtraflags2 | CDSN_CTRL_CE, docptr, CDSNControl);
DoC_Delay(docptr, 4);
}
/* DoC_SelectChip: Select a given flash chip within the current floor */
static int DoC_SelectChip(void __iomem * docptr, int chip)
{
/* Select the individual flash chip requested */
WriteDOC(chip, docptr, CDSNDeviceSelect);
DoC_Delay(docptr, 4);
/* Wait for it to be ready */
return DoC_WaitReady(docptr);
}
/* DoC_SelectFloor: Select a given floor (bank of flash chips) */
static int DoC_SelectFloor(void __iomem * docptr, int floor)
{
/* Select the floor (bank) of chips required */
WriteDOC(floor, docptr, FloorSelect);
/* Wait for the chip to be ready */
return DoC_WaitReady(docptr);
}
/* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */
static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip)
{
int mfr, id, i, j;
volatile char dummy;
/* Page in the required floor/chip
FIXME: is this supported by Millennium ?? */
DoC_SelectFloor(doc->virtadr, floor);
DoC_SelectChip(doc->virtadr, chip);
/* Reset the chip, see Software Requirement 11.4 item 1. */
DoC_Command(doc->virtadr, NAND_CMD_RESET, CDSN_CTRL_WP);
DoC_WaitReady(doc->virtadr);
/* Read the NAND chip ID: 1. Send ReadID command */
DoC_Command(doc->virtadr, NAND_CMD_READID, CDSN_CTRL_WP);
/* Read the NAND chip ID: 2. Send address byte zero */
DoC_Address(doc->virtadr, 1, 0x00, CDSN_CTRL_WP, 0x00);
/* Read the manufacturer and device id codes of the flash device through
CDSN IO register see Software Requirement 11.4 item 5.*/
dummy = ReadDOC(doc->virtadr, ReadPipeInit);
DoC_Delay(doc->virtadr, 2);
mfr = ReadDOC(doc->virtadr, Mil_CDSN_IO);
DoC_Delay(doc->virtadr, 2);
id = ReadDOC(doc->virtadr, Mil_CDSN_IO);
dummy = ReadDOC(doc->virtadr, LastDataRead);
/* No response - return failure */
if (mfr == 0xff || mfr == 0)
return 0;
/* FIXME: to deal with multi-flash on multi-Millennium case more carefully */
for (i = 0; nand_flash_ids[i].name != NULL; i++) {
if ( id == nand_flash_ids[i].dev_id) {
/* Try to identify manufacturer */
for (j = 0; nand_manuf_ids[j].id != 0x0; j++) {
if (nand_manuf_ids[j].id == mfr)
break;
}
printk(KERN_INFO "Flash chip found: Manufacturer ID: %2.2X, "
"Chip ID: %2.2X (%s:%s)\n",
mfr, id, nand_manuf_ids[j].name, nand_flash_ids[i].name);
doc->mfr = mfr;
doc->id = id;
doc->chipshift = ffs((nand_flash_ids[i].chipsize << 20)) - 1;
break;
}
}
if (nand_flash_ids[i].name == NULL)
return 0;
else
return 1;
}
/* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */
static void DoC_ScanChips(struct DiskOnChip *this)
{
int floor, chip;
int numchips[MAX_FLOORS_MIL];
int ret;
this->numchips = 0;
this->mfr = 0;
this->id = 0;
/* For each floor, find the number of valid chips it contains */
for (floor = 0,ret = 1; floor < MAX_FLOORS_MIL; floor++) {
numchips[floor] = 0;
for (chip = 0; chip < MAX_CHIPS_MIL && ret != 0; chip++) {
ret = DoC_IdentChip(this, floor, chip);
if (ret) {
numchips[floor]++;
this->numchips++;
}
}
}
/* If there are none at all that we recognise, bail */
if (!this->numchips) {
printk("No flash chips recognised.\n");
return;
}
/* Allocate an array to hold the information for each chip */
this->chips = kmalloc(sizeof(struct Nand) * this->numchips, GFP_KERNEL);
if (!this->chips){
printk("No memory for allocating chip info structures\n");
return;
}
/* Fill out the chip array with {floor, chipno} for each
* detected chip in the device. */
for (floor = 0, ret = 0; floor < MAX_FLOORS_MIL; floor++) {
for (chip = 0 ; chip < numchips[floor] ; chip++) {
this->chips[ret].floor = floor;
this->chips[ret].chip = chip;
this->chips[ret].curadr = 0;
this->chips[ret].curmode = 0x50;
ret++;
}
}
/* Calculate and print the total size of the device */
this->totlen = this->numchips * (1 << this->chipshift);
printk(KERN_INFO "%d flash chips found. Total DiskOnChip size: %ld MiB\n",
this->numchips ,this->totlen >> 20);
}
static int DoCMil_is_alias(struct DiskOnChip *doc1, struct DiskOnChip *doc2)
{
int tmp1, tmp2, retval;
if (doc1->physadr == doc2->physadr)
return 1;
/* Use the alias resolution register which was set aside for this
* purpose. If it's value is the same on both chips, they might
* be the same chip, and we write to one and check for a change in
* the other. It's unclear if this register is usuable in the
* DoC 2000 (it's in the Millenium docs), but it seems to work. */
tmp1 = ReadDOC(doc1->virtadr, AliasResolution);
tmp2 = ReadDOC(doc2->virtadr, AliasResolution);
if (tmp1 != tmp2)
return 0;
WriteDOC((tmp1+1) % 0xff, doc1->virtadr, AliasResolution);
tmp2 = ReadDOC(doc2->virtadr, AliasResolution);
if (tmp2 == (tmp1+1) % 0xff)
retval = 1;
else
retval = 0;
/* Restore register contents. May not be necessary, but do it just to
* be safe. */
WriteDOC(tmp1, doc1->virtadr, AliasResolution);
return retval;
}
/* This routine is found from the docprobe code by symbol_get(),
* which will bump the use count of this module. */
void DoCMil_init(struct mtd_info *mtd)
{
struct DiskOnChip *this = mtd->priv;
struct DiskOnChip *old = NULL;
/* We must avoid being called twice for the same device. */
if (docmillist)
old = docmillist->priv;
while (old) {
if (DoCMil_is_alias(this, old)) {
printk(KERN_NOTICE "Ignoring DiskOnChip Millennium at "
"0x%lX - already configured\n", this->physadr);
iounmap(this->virtadr);
kfree(mtd);
return;
}
if (old->nextdoc)
old = old->nextdoc->priv;
else
old = NULL;
}
mtd->name = "DiskOnChip Millennium";
printk(KERN_NOTICE "DiskOnChip Millennium found at address 0x%lX\n",
this->physadr);
mtd->type = MTD_NANDFLASH;
mtd->flags = MTD_CAP_NANDFLASH;
/* FIXME: erase size is not always 8KiB */
mtd->erasesize = 0x2000;
mtd->writebufsize = mtd->writesize = 512;
mtd->oobsize = 16;
mtd->ecc_strength = 2;
mtd->owner = THIS_MODULE;
mtd->_erase = doc_erase;
mtd->_read = doc_read;
mtd->_write = doc_write;
mtd->_read_oob = doc_read_oob;
mtd->_write_oob = doc_write_oob;
this->curfloor = -1;
this->curchip = -1;
/* Ident all the chips present. */
DoC_ScanChips(this);
if (!this->totlen) {
kfree(mtd);
iounmap(this->virtadr);
} else {
this->nextdoc = docmillist;
docmillist = mtd;
mtd->size = this->totlen;
mtd_device_register(mtd, NULL, 0);
return;
}
}
EXPORT_SYMBOL_GPL(DoCMil_init);
static int doc_read (struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
int i, ret;
volatile char dummy;
unsigned char syndrome[6], eccbuf[6];
struct DiskOnChip *this = mtd->priv;
void __iomem *docptr = this->virtadr;
struct Nand *mychip = &this->chips[from >> (this->chipshift)];
/* Don't allow a single read to cross a 512-byte block boundary */
if (from + len > ((from | 0x1ff) + 1))
len = ((from | 0x1ff) + 1) - from;
/* Find the chip which is to be used and select it */
if (this->curfloor != mychip->floor) {
DoC_SelectFloor(docptr, mychip->floor);
DoC_SelectChip(docptr, mychip->chip);
} else if (this->curchip != mychip->chip) {
DoC_SelectChip(docptr, mychip->chip);
}
this->curfloor = mychip->floor;
this->curchip = mychip->chip;
/* issue the Read0 or Read1 command depend on which half of the page
we are accessing. Polling the Flash Ready bit after issue 3 bytes
address in Sequence Read Mode, see Software Requirement 11.4 item 1.*/
DoC_Command(docptr, (from >> 8) & 1, CDSN_CTRL_WP);
DoC_Address(docptr, 3, from, CDSN_CTRL_WP, 0x00);
DoC_WaitReady(docptr);
/* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
WriteDOC (DOC_ECC_EN, docptr, ECCConf);
/* Read the data via the internal pipeline through CDSN IO register,
see Pipelined Read Operations 11.3 */
dummy = ReadDOC(docptr, ReadPipeInit);
#ifndef USE_MEMCPY
for (i = 0; i < len-1; i++) {
/* N.B. you have to increase the source address in this way or the
ECC logic will not work properly */
buf[i] = ReadDOC(docptr, Mil_CDSN_IO + (i & 0xff));
}
#else
memcpy_fromio(buf, docptr + DoC_Mil_CDSN_IO, len - 1);
#endif
buf[len - 1] = ReadDOC(docptr, LastDataRead);
/* Let the caller know we completed it */
*retlen = len;
ret = 0;
/* Read the ECC data from Spare Data Area,
see Reed-Solomon EDC/ECC 11.1 */
dummy = ReadDOC(docptr, ReadPipeInit);
#ifndef USE_MEMCPY
for (i = 0; i < 5; i++) {
/* N.B. you have to increase the source address in this way or the
ECC logic will not work properly */
eccbuf[i] = ReadDOC(docptr, Mil_CDSN_IO + i);
}
#else
memcpy_fromio(eccbuf, docptr + DoC_Mil_CDSN_IO, 5);
#endif
eccbuf[5] = ReadDOC(docptr, LastDataRead);
/* Flush the pipeline */
dummy = ReadDOC(docptr, ECCConf);
dummy = ReadDOC(docptr, ECCConf);
/* Check the ECC Status */
if (ReadDOC(docptr, ECCConf) & 0x80) {
int nb_errors;
/* There was an ECC error */
#ifdef ECC_DEBUG
printk("DiskOnChip ECC Error: Read at %lx\n", (long)from);
#endif
/* Read the ECC syndrome through the DiskOnChip ECC logic.
These syndrome will be all ZERO when there is no error */
for (i = 0; i < 6; i++) {
syndrome[i] = ReadDOC(docptr, ECCSyndrome0 + i);
}
nb_errors = doc_decode_ecc(buf, syndrome);
#ifdef ECC_DEBUG
printk("ECC Errors corrected: %x\n", nb_errors);
#endif
if (nb_errors < 0) {
/* We return error, but have actually done the read. Not that
this can be told to user-space, via sys_read(), but at least
MTD-aware stuff can know about it by checking *retlen */
ret = -EIO;
}
}
#ifdef PSYCHO_DEBUG
printk("ECC DATA at %lx: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
(long)from, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
eccbuf[4], eccbuf[5]);
#endif
/* disable the ECC engine */
WriteDOC(DOC_ECC_DIS, docptr , ECCConf);
return ret;
}
static int doc_write (struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf)
{
int i,ret = 0;
char eccbuf[6];
volatile char dummy;
struct DiskOnChip *this = mtd->priv;
void __iomem *docptr = this->virtadr;
struct Nand *mychip = &this->chips[to >> (this->chipshift)];
#if 0
/* Don't allow a single write to cross a 512-byte block boundary */
if (to + len > ( (to | 0x1ff) + 1))
len = ((to | 0x1ff) + 1) - to;
#else
/* Don't allow writes which aren't exactly one block */
if (to & 0x1ff || len != 0x200)
return -EINVAL;
#endif
/* Find the chip which is to be used and select it */
if (this->curfloor != mychip->floor) {
DoC_SelectFloor(docptr, mychip->floor);
DoC_SelectChip(docptr, mychip->chip);
} else if (this->curchip != mychip->chip) {
DoC_SelectChip(docptr, mychip->chip);
}
this->curfloor = mychip->floor;
this->curchip = mychip->chip;
/* Reset the chip, see Software Requirement 11.4 item 1. */
DoC_Command(docptr, NAND_CMD_RESET, 0x00);
DoC_WaitReady(docptr);
/* Set device to main plane of flash */
DoC_Command(docptr, NAND_CMD_READ0, 0x00);
/* issue the Serial Data In command to initial the Page Program process */
DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
DoC_Address(docptr, 3, to, 0x00, 0x00);
DoC_WaitReady(docptr);
/* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
WriteDOC (DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf);
/* Write the data via the internal pipeline through CDSN IO register,
see Pipelined Write Operations 11.2 */
#ifndef USE_MEMCPY
for (i = 0; i < len; i++) {
/* N.B. you have to increase the source address in this way or the
ECC logic will not work properly */
WriteDOC(buf[i], docptr, Mil_CDSN_IO + i);
}
#else
memcpy_toio(docptr + DoC_Mil_CDSN_IO, buf, len);
#endif
WriteDOC(0x00, docptr, WritePipeTerm);
/* Write ECC data to flash, the ECC info is generated by the DiskOnChip ECC logic
see Reed-Solomon EDC/ECC 11.1 */
WriteDOC(0, docptr, NOP);
WriteDOC(0, docptr, NOP);
WriteDOC(0, docptr, NOP);
/* Read the ECC data through the DiskOnChip ECC logic */
for (i = 0; i < 6; i++) {
eccbuf[i] = ReadDOC(docptr, ECCSyndrome0 + i);
}
/* ignore the ECC engine */
WriteDOC(DOC_ECC_DIS, docptr , ECCConf);
#ifndef USE_MEMCPY
/* Write the ECC data to flash */
for (i = 0; i < 6; i++) {
/* N.B. you have to increase the source address in this way or the
ECC logic will not work properly */
WriteDOC(eccbuf[i], docptr, Mil_CDSN_IO + i);
}
#else
memcpy_toio(docptr + DoC_Mil_CDSN_IO, eccbuf, 6);
#endif
/* write the block status BLOCK_USED (0x5555) at the end of ECC data
FIXME: this is only a hack for programming the IPL area for LinuxBIOS
and should be replace with proper codes in user space utilities */
WriteDOC(0x55, docptr, Mil_CDSN_IO);
WriteDOC(0x55, docptr, Mil_CDSN_IO + 1);
WriteDOC(0x00, docptr, WritePipeTerm);
#ifdef PSYCHO_DEBUG
printk("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
(long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
eccbuf[4], eccbuf[5]);
#endif
/* Commit the Page Program command and wait for ready
see Software Requirement 11.4 item 1.*/
DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00);
DoC_WaitReady(docptr);
/* Read the status of the flash device through CDSN IO register
see Software Requirement 11.4 item 5.*/
DoC_Command(docptr, NAND_CMD_STATUS, CDSN_CTRL_WP);
dummy = ReadDOC(docptr, ReadPipeInit);
DoC_Delay(docptr, 2);
if (ReadDOC(docptr, Mil_CDSN_IO) & 1) {
printk("Error programming flash\n");
/* Error in programming
FIXME: implement Bad Block Replacement (in nftl.c ??) */
ret = -EIO;
}
dummy = ReadDOC(docptr, LastDataRead);
/* Let the caller know we completed it */
*retlen = len;
return ret;
}
static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
struct mtd_oob_ops *ops)
{
#ifndef USE_MEMCPY
int i;
#endif
volatile char dummy;
struct DiskOnChip *this = mtd->priv;
void __iomem *docptr = this->virtadr;
struct Nand *mychip = &this->chips[ofs >> this->chipshift];
uint8_t *buf = ops->oobbuf;
size_t len = ops->len;
BUG_ON(ops->mode != MTD_OPS_PLACE_OOB);
ofs += ops->ooboffs;
/* Find the chip which is to be used and select it */
if (this->curfloor != mychip->floor) {
DoC_SelectFloor(docptr, mychip->floor);
DoC_SelectChip(docptr, mychip->chip);
} else if (this->curchip != mychip->chip) {
DoC_SelectChip(docptr, mychip->chip);
}
this->curfloor = mychip->floor;
this->curchip = mychip->chip;
/* disable the ECC engine */
WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
WriteDOC (DOC_ECC_DIS, docptr, ECCConf);
/* issue the Read2 command to set the pointer to the Spare Data Area.
Polling the Flash Ready bit after issue 3 bytes address in
Sequence Read Mode, see Software Requirement 11.4 item 1.*/
DoC_Command(docptr, NAND_CMD_READOOB, CDSN_CTRL_WP);
DoC_Address(docptr, 3, ofs, CDSN_CTRL_WP, 0x00);
DoC_WaitReady(docptr);
/* Read the data out via the internal pipeline through CDSN IO register,
see Pipelined Read Operations 11.3 */
dummy = ReadDOC(docptr, ReadPipeInit);
#ifndef USE_MEMCPY
for (i = 0; i < len-1; i++) {
/* N.B. you have to increase the source address in this way or the
ECC logic will not work properly */
buf[i] = ReadDOC(docptr, Mil_CDSN_IO + i);
}
#else
memcpy_fromio(buf, docptr + DoC_Mil_CDSN_IO, len - 1);
#endif
buf[len - 1] = ReadDOC(docptr, LastDataRead);
ops->retlen = len;
return 0;
}
static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
struct mtd_oob_ops *ops)
{
#ifndef USE_MEMCPY
int i;
#endif
volatile char dummy;
int ret = 0;
struct DiskOnChip *this = mtd->priv;
void __iomem *docptr = this->virtadr;
struct Nand *mychip = &this->chips[ofs >> this->chipshift];
uint8_t *buf = ops->oobbuf;
size_t len = ops->len;
BUG_ON(ops->mode != MTD_OPS_PLACE_OOB);
ofs += ops->ooboffs;
/* Find the chip which is to be used and select it */
if (this->curfloor != mychip->floor) {
DoC_SelectFloor(docptr, mychip->floor);
DoC_SelectChip(docptr, mychip->chip);
} else if (this->curchip != mychip->chip) {
DoC_SelectChip(docptr, mychip->chip);
}
this->curfloor = mychip->floor;
this->curchip = mychip->chip;
/* disable the ECC engine */
WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
WriteDOC (DOC_ECC_DIS, docptr, ECCConf);
/* Reset the chip, see Software Requirement 11.4 item 1. */
DoC_Command(docptr, NAND_CMD_RESET, CDSN_CTRL_WP);
DoC_WaitReady(docptr);
/* issue the Read2 command to set the pointer to the Spare Data Area. */
DoC_Command(docptr, NAND_CMD_READOOB, CDSN_CTRL_WP);
/* issue the Serial Data In command to initial the Page Program process */
DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
DoC_Address(docptr, 3, ofs, 0x00, 0x00);
/* Write the data via the internal pipeline through CDSN IO register,
see Pipelined Write Operations 11.2 */
#ifndef USE_MEMCPY
for (i = 0; i < len; i++) {
/* N.B. you have to increase the source address in this way or the
ECC logic will not work properly */
WriteDOC(buf[i], docptr, Mil_CDSN_IO + i);
}
#else
memcpy_toio(docptr + DoC_Mil_CDSN_IO, buf, len);
#endif
WriteDOC(0x00, docptr, WritePipeTerm);
/* Commit the Page Program command and wait for ready
see Software Requirement 11.4 item 1.*/
DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00);
DoC_WaitReady(docptr);
/* Read the status of the flash device through CDSN IO register
see Software Requirement 11.4 item 5.*/
DoC_Command(docptr, NAND_CMD_STATUS, 0x00);
dummy = ReadDOC(docptr, ReadPipeInit);
DoC_Delay(docptr, 2);
if (ReadDOC(docptr, Mil_CDSN_IO) & 1) {
printk("Error programming oob data\n");
/* FIXME: implement Bad Block Replacement (in nftl.c ??) */
ops->retlen = 0;
ret = -EIO;
}
dummy = ReadDOC(docptr, LastDataRead);
ops->retlen = len;
return ret;
}
int doc_erase (struct mtd_info *mtd, struct erase_info *instr)
{
volatile char dummy;
struct DiskOnChip *this = mtd->priv;
__u32 ofs = instr->addr;
__u32 len = instr->len;
void __iomem *docptr = this->virtadr;
struct Nand *mychip = &this->chips[ofs >> this->chipshift];
if (len != mtd->erasesize)
printk(KERN_WARNING "Erase not right size (%x != %x)n",
len, mtd->erasesize);
/* Find the chip which is to be used and select it */
if (this->curfloor != mychip->floor) {
DoC_SelectFloor(docptr, mychip->floor);
DoC_SelectChip(docptr, mychip->chip);
} else if (this->curchip != mychip->chip) {
DoC_SelectChip(docptr, mychip->chip);
}
this->curfloor = mychip->floor;
this->curchip = mychip->chip;
instr->state = MTD_ERASE_PENDING;
/* issue the Erase Setup command */
DoC_Command(docptr, NAND_CMD_ERASE1, 0x00);
DoC_Address(docptr, 2, ofs, 0x00, 0x00);
/* Commit the Erase Start command and wait for ready
see Software Requirement 11.4 item 1.*/
DoC_Command(docptr, NAND_CMD_ERASE2, 0x00);
DoC_WaitReady(docptr);
instr->state = MTD_ERASING;
/* Read the status of the flash device through CDSN IO register
see Software Requirement 11.4 item 5.
FIXME: it seems that we are not wait long enough, some blocks are not
erased fully */
DoC_Command(docptr, NAND_CMD_STATUS, CDSN_CTRL_WP);
dummy = ReadDOC(docptr, ReadPipeInit);
DoC_Delay(docptr, 2);
if (ReadDOC(docptr, Mil_CDSN_IO) & 1) {
printk("Error Erasing at 0x%x\n", ofs);
/* There was an error
FIXME: implement Bad Block Replacement (in nftl.c ??) */
instr->state = MTD_ERASE_FAILED;
} else
instr->state = MTD_ERASE_DONE;
dummy = ReadDOC(docptr, LastDataRead);
mtd_erase_callback(instr);
return 0;
}
/****************************************************************************
*
* Module stuff
*
****************************************************************************/
static void __exit cleanup_doc2001(void)
{
struct mtd_info *mtd;
struct DiskOnChip *this;
while ((mtd=docmillist)) {
this = mtd->priv;
docmillist = this->nextdoc;
mtd_device_unregister(mtd);
iounmap(this->virtadr);
kfree(this->chips);
kfree(mtd);
}
}
module_exit(cleanup_doc2001);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al.");
MODULE_DESCRIPTION("Alternative driver for DiskOnChip Millennium");

1080
drivers/mtd/devices/doc2001plus.c
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521
drivers/mtd/devices/docecc.c
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@ -1,521 +0,0 @@
/*
* ECC algorithm for M-systems disk on chip. We use the excellent Reed
* Solmon code of Phil Karn (karn@ka9q.ampr.org) available under the
* GNU GPL License. The rest is simply to convert the disk on chip
* syndrome into a standard syndome.
*
* Author: Fabrice Bellard (fabrice.bellard@netgem.com)
* Copyright (C) 2000 Netgem S.A.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/doc2000.h>
#define DEBUG_ECC 0
/* need to undef it (from asm/termbits.h) */
#undef B0
#define MM 10 /* Symbol size in bits */
#define KK (1023-4) /* Number of data symbols per block */
#define B0 510 /* First root of generator polynomial, alpha form */
#define PRIM 1 /* power of alpha used to generate roots of generator poly */
#define NN ((1 << MM) - 1)
typedef unsigned short dtype;
/* 1+x^3+x^10 */
static const int Pp[MM+1] = { 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1 };
/* This defines the type used to store an element of the Galois Field
* used by the code. Make sure this is something larger than a char if
* if anything larger than GF(256) is used.
*
* Note: unsigned char will work up to GF(256) but int seems to run
* faster on the Pentium.
*/
typedef int gf;
/* No legal value in index form represents zero, so
* we need a special value for this purpose
*/
#define A0 (NN)
/* Compute x % NN, where NN is 2**MM - 1,
* without a slow divide
*/
static inline gf
modnn(int x)
{
while (x >= NN) {
x -= NN;
x = (x >> MM) + (x & NN);
}
return x;
}
#define CLEAR(a,n) {\
int ci;\
for(ci=(n)-1;ci >=0;ci--)\
(a)[ci] = 0;\
}
#define COPY(a,b,n) {\
int ci;\
for(ci=(n)-1;ci >=0;ci--)\
(a)[ci] = (b)[ci];\
}
#define COPYDOWN(a,b,n) {\
int ci;\
for(ci=(n)-1;ci >=0;ci--)\
(a)[ci] = (b)[ci];\
}
#define Ldec 1
/* generate GF(2**m) from the irreducible polynomial p(X) in Pp[0]..Pp[m]
lookup tables: index->polynomial form alpha_to[] contains j=alpha**i;
polynomial form -> index form index_of[j=alpha**i] = i
alpha=2 is the primitive element of GF(2**m)
HARI's COMMENT: (4/13/94) alpha_to[] can be used as follows:
Let @ represent the primitive element commonly called "alpha" that
is the root of the primitive polynomial p(x). Then in GF(2^m), for any
0 <= i <= 2^m-2,
@^i = a(0) + a(1) @ + a(2) @^2 + ... + a(m-1) @^(m-1)
where the binary vector (a(0),a(1),a(2),...,a(m-1)) is the representation
of the integer "alpha_to[i]" with a(0) being the LSB and a(m-1) the MSB. Thus for
example the polynomial representation of @^5 would be given by the binary
representation of the integer "alpha_to[5]".
Similarly, index_of[] can be used as follows:
As above, let @ represent the primitive element of GF(2^m) that is
the root of the primitive polynomial p(x). In order to find the power
of @ (alpha) that has the polynomial representation
a(0) + a(1) @ + a(2) @^2 + ... + a(m-1) @^(m-1)
we consider the integer "i" whose binary representation with a(0) being LSB
and a(m-1) MSB is (a(0),a(1),...,a(m-1)) and locate the entry
"index_of[i]". Now, @^index_of[i] is that element whose polynomial
representation is (a(0),a(1),a(2),...,a(m-1)).
NOTE:
The element alpha_to[2^m-1] = 0 always signifying that the
representation of "@^infinity" = 0 is (0,0,0,...,0).
Similarly, the element index_of[0] = A0 always signifying
that the power of alpha which has the polynomial representation
(0,0,...,0) is "infinity".
*/
static void
generate_gf(dtype Alpha_to[NN + 1], dtype Index_of[NN + 1])
{
register int i, mask;
mask = 1;
Alpha_to[MM] = 0;
for (i = 0; i < MM; i++) {
Alpha_to[i] = mask;
Index_of[Alpha_to[i]] = i;
/* If Pp[i] == 1 then, term @^i occurs in poly-repr of @^MM */
if (Pp[i] != 0)
Alpha_to[MM] ^= mask; /* Bit-wise EXOR operation */
mask <<= 1; /* single left-shift */
}
Index_of[Alpha_to[MM]] = MM;
/*
* Have obtained poly-repr of @^MM. Poly-repr of @^(i+1) is given by
* poly-repr of @^i shifted left one-bit and accounting for any @^MM
* term that may occur when poly-repr of @^i is shifted.
*/
mask >>= 1;
for (i = MM + 1; i < NN; i++) {
if (Alpha_to[i - 1] >= mask)
Alpha_to[i] = Alpha_to[MM] ^ ((Alpha_to[i - 1] ^ mask) << 1);
else
Alpha_to[i] = Alpha_to[i - 1] << 1;
Index_of[Alpha_to[i]] = i;
}
Index_of[0] = A0;
Alpha_to[NN] = 0;
}
/*
* Performs ERRORS+ERASURES decoding of RS codes. bb[] is the content
* of the feedback shift register after having processed the data and
* the ECC.
*
* Return number of symbols corrected, or -1 if codeword is illegal
* or uncorrectable. If eras_pos is non-null, the detected error locations
* are written back. NOTE! This array must be at least NN-KK elements long.
* The corrected data are written in eras_val[]. They must be xor with the data
* to retrieve the correct data : data[erase_pos[i]] ^= erase_val[i] .
*
* First "no_eras" erasures are declared by the calling program. Then, the
* maximum # of errors correctable is t_after_eras = floor((NN-KK-no_eras)/2).
* If the number of channel errors is not greater than "t_after_eras" the
* transmitted codeword will be recovered. Details of algorithm can be found
* in R. Blahut's "Theory ... of Error-Correcting Codes".
* Warning: the eras_pos[] array must not contain duplicate entries; decoder failure
* will result. The decoder *could* check for this condition, but it would involve
* extra time on every decoding operation.
* */
static int
eras_dec_rs(dtype Alpha_to[NN + 1], dtype Index_of[NN + 1],
gf bb[NN - KK + 1], gf eras_val[NN-KK], int eras_pos[NN-KK],
int no_eras)
{
int deg_lambda, el, deg_omega;
int i, j, r,k;
gf u,q,tmp,num1,num2,den,discr_r;
gf lambda[NN-KK + 1], s[NN-KK + 1]; /* Err+Eras Locator poly
* and syndrome poly */
gf b[NN-KK + 1], t[NN-KK + 1], omega[NN-KK + 1];
gf root[NN-KK], reg[NN-KK + 1], loc[NN-KK];
int syn_error, count;
syn_error = 0;
for(i=0;i<NN-KK;i++)
syn_error |= bb[i];
if (!syn_error) {
/* if remainder is zero, data[] is a codeword and there are no
* errors to correct. So return data[] unmodified
*/
count = 0;
goto finish;
}
for(i=1;i<=NN-KK;i++){
s[i] = bb[0];
}
for(j=1;j<NN-KK;j++){
if(bb[j] == 0)
continue;
tmp = Index_of[bb[j]];
for(i=1;i<=NN-KK;i++)
s[i] ^= Alpha_to[modnn(tmp + (B0+i-1)*PRIM*j)];
}
/* undo the feedback register implicit multiplication and convert
syndromes to index form */
for(i=1;i<=NN-KK;i++) {
tmp = Index_of[s[i]];
if (tmp != A0)
tmp = modnn(tmp + 2 * KK * (B0+i-1)*PRIM);
s[i] = tmp;
}
CLEAR(&lambda[1],NN-KK);
lambda[0] = 1;
if (no_eras > 0) {
/* Init lambda to be the erasure locator polynomial */
lambda[1] = Alpha_to[modnn(PRIM * eras_pos[0])];
for (i = 1; i < no_eras; i++) {
u = modnn(PRIM*eras_pos[i]);
for (j = i+1; j > 0; j--) {
tmp = Index_of[lambda[j - 1]];
if(tmp != A0)
lambda[j] ^= Alpha_to[modnn(u + tmp)];
}
}
#if DEBUG_ECC >= 1
/* Test code that verifies the erasure locator polynomial just constructed
Needed only for decoder debugging. */
/* find roots of the erasure location polynomial */
for(i=1;i<=no_eras;i++)
reg[i] = Index_of[lambda[i]];
count = 0;
for (i = 1,k=NN-Ldec; i <= NN; i++,k = modnn(NN+k-Ldec)) {
q = 1;
for (j = 1; j <= no_eras; j++)
if (reg[j] != A0) {
reg[j] = modnn(reg[j] + j);
q ^= Alpha_to[reg[j]];
}
if (q != 0)
continue;
/* store root and error location number indices */
root[count] = i;
loc[count] = k;
count++;
}
if (count != no_eras) {
printf("\n lambda(x) is WRONG\n");
count = -1;
goto finish;
}
#if DEBUG_ECC >= 2
printf("\n Erasure positions as determined by roots of Eras Loc Poly:\n");
for (i = 0; i < count; i++)
printf("%d ", loc[i]);
printf("\n");
#endif
#endif
}
for(i=0;i<NN-KK+1;i++)
b[i] = Index_of[lambda[i]];
/*
* Begin Berlekamp-Massey algorithm to determine error+erasure
* locator polynomial
*/
r = no_eras;
el = no_eras;
while (++r <= NN-KK) { /* r is the step number */
/* Compute discrepancy at the r-th step in poly-form */
discr_r = 0;
for (i = 0; i < r; i++){
if ((lambda[i] != 0) && (s[r - i] != A0)) {
discr_r ^= Alpha_to[modnn(Index_of[lambda[i]] + s[r - i])];
}
}
discr_r = Index_of[discr_r]; /* Index form */
if (discr_r == A0) {
/* 2 lines below: B(x) <-- x*B(x) */
COPYDOWN(&b[1],b,NN-KK);
b[0] = A0;
} else {
/* 7 lines below: T(x) <-- lambda(x) - discr_r*x*b(x) */
t[0] = lambda[0];
for (i = 0 ; i < NN-KK; i++) {
if(b[i] != A0)
t[i+1] = lambda[i+1] ^ Alpha_to[modnn(discr_r + b[i])];
else
t[i+1] = lambda[i+1];
}
if (2 * el <= r + no_eras - 1) {
el = r + no_eras - el;
/*
* 2 lines below: B(x) <-- inv(discr_r) *
* lambda(x)
*/
for (i = 0; i <= NN-KK; i++)
b[i] = (lambda[i] == 0) ? A0 : modnn(Index_of[lambda[i]] - discr_r + NN);
} else {
/* 2 lines below: B(x) <-- x*B(x) */
COPYDOWN(&b[1],b,NN-KK);
b[0] = A0;
}
COPY(lambda,t,NN-KK+1);
}
}
/* Convert lambda to index form and compute deg(lambda(x)) */
deg_lambda = 0;
for(i=0;i<NN-KK+1;i++){
lambda[i] = Index_of[lambda[i]];
if(lambda[i] != A0)
deg_lambda = i;
}
/*
* Find roots of the error+erasure locator polynomial by Chien
* Search
*/
COPY(&reg[1],&lambda[1],NN-KK);
count = 0; /* Number of roots of lambda(x) */
for (i = 1,k=NN-Ldec; i <= NN; i++,k = modnn(NN+k-Ldec)) {
q = 1;
for (j = deg_lambda; j > 0; j--){
if (reg[j] != A0) {
reg[j] = modnn(reg[j] + j);
q ^= Alpha_to[reg[j]];
}
}
if (q != 0)
continue;
/* store root (index-form) and error location number */
root[count] = i;
loc[count] = k;
/* If we've already found max possible roots,
* abort the search to save time
*/
if(++count == deg_lambda)
break;
}
if (deg_lambda != count) {
/*
* deg(lambda) unequal to number of roots => uncorrectable
* error detected
*/
count = -1;
goto finish;
}
/*
* Compute err+eras evaluator poly omega(x) = s(x)*lambda(x) (modulo
* x**(NN-KK)). in index form. Also find deg(omega).
*/
deg_omega = 0;
for (i = 0; i < NN-KK;i++){
tmp = 0;
j = (deg_lambda < i) ? deg_lambda : i;
for(;j >= 0; j--){
if ((s[i + 1 - j] != A0) && (lambda[j] != A0))
tmp ^= Alpha_to[modnn(s[i + 1 - j] + lambda[j])];
}
if(tmp != 0)
deg_omega = i;
omega[i] = Index_of[tmp];
}
omega[NN-KK] = A0;
/*
* Compute error values in poly-form. num1 = omega(inv(X(l))), num2 =
* inv(X(l))**(B0-1) and den = lambda_pr(inv(X(l))) all in poly-form
*/
for (j = count-1; j >=0; j--) {
num1 = 0;
for (i = deg_omega; i >= 0; i--) {
if (omega[i] != A0)
num1 ^= Alpha_to[modnn(omega[i] + i * root[j])];
}
num2 = Alpha_to[modnn(root[j] * (B0 - 1) + NN)];
den = 0;
/* lambda[i+1] for i even is the formal derivative lambda_pr of lambda[i] */
for (i = min(deg_lambda,NN-KK-1) & ~1; i >= 0; i -=2) {
if(lambda[i+1] != A0)
den ^= Alpha_to[modnn(lambda[i+1] + i * root[j])];
}
if (den == 0) {
#if DEBUG_ECC >= 1
printf("\n ERROR: denominator = 0\n");
#endif
/* Convert to dual- basis */
count = -1;
goto finish;
}
/* Apply error to data */
if (num1 != 0) {
eras_val[j] = Alpha_to[modnn(Index_of[num1] + Index_of[num2] + NN - Index_of[den])];
} else {
eras_val[j] = 0;
}
}
finish:
for(i=0;i<count;i++)
eras_pos[i] = loc[i];
return count;
}
/***************************************************************************/
/* The DOC specific code begins here */
#define SECTOR_SIZE 512
/* The sector bytes are packed into NB_DATA MM bits words */
#define NB_DATA (((SECTOR_SIZE + 1) * 8 + 6) / MM)
/*
* Correct the errors in 'sector[]' by using 'ecc1[]' which is the
* content of the feedback shift register applyied to the sector and
* the ECC. Return the number of errors corrected (and correct them in
* sector), or -1 if error
*/
int doc_decode_ecc(unsigned char sector[SECTOR_SIZE], unsigned char ecc1[6])
{
int parity, i, nb_errors;
gf bb[NN - KK + 1];
gf error_val[NN-KK];
int error_pos[NN-KK], pos, bitpos, index, val;
dtype *Alpha_to, *Index_of;
/* init log and exp tables here to save memory. However, it is slower */
Alpha_to = kmalloc((NN + 1) * sizeof(dtype), GFP_KERNEL);
if (!Alpha_to)
return -1;
Index_of = kmalloc((NN + 1) * sizeof(dtype), GFP_KERNEL);
if (!Index_of) {
kfree(Alpha_to);
return -1;
}
generate_gf(Alpha_to, Index_of);
parity = ecc1[1];
bb[0] = (ecc1[4] & 0xff) | ((ecc1[5] & 0x03) << 8);
bb[1] = ((ecc1[5] & 0xfc) >> 2) | ((ecc1[2] & 0x0f) << 6);
bb[2] = ((ecc1[2] & 0xf0) >> 4) | ((ecc1[3] & 0x3f) << 4);
bb[3] = ((ecc1[3] & 0xc0) >> 6) | ((ecc1[0] & 0xff) << 2);
nb_errors = eras_dec_rs(Alpha_to, Index_of, bb,
error_val, error_pos, 0);
if (nb_errors <= 0)
goto the_end;
/* correct the errors */
for(i=0;i<nb_errors;i++) {
pos = error_pos[i];
if (pos >= NB_DATA && pos < KK) {
nb_errors = -1;
goto the_end;
}
if (pos < NB_DATA) {
/* extract bit position (MSB first) */
pos = 10 * (NB_DATA - 1 - pos) - 6;
/* now correct the following 10 bits. At most two bytes
can be modified since pos is even */
index = (pos >> 3) ^ 1;
bitpos = pos & 7;
if ((index >= 0 && index < SECTOR_SIZE) ||
index == (SECTOR_SIZE + 1)) {
val = error_val[i] >> (2 + bitpos);
parity ^= val;
if (index < SECTOR_SIZE)
sector[index] ^= val;
}
index = ((pos >> 3) + 1) ^ 1;
bitpos = (bitpos + 10) & 7;
if (bitpos == 0)
bitpos = 8;
if ((index >= 0 && index < SECTOR_SIZE) ||
index == (SECTOR_SIZE + 1)) {
val = error_val[i] << (8 - bitpos);
parity ^= val;
if (index < SECTOR_SIZE)
sector[index] ^= val;
}
}
}
/* use parity to test extra errors */
if ((parity & 0xff) != 0)
nb_errors = -1;
the_end:
kfree(Alpha_to);
kfree(Index_of);
return nb_errors;
}
EXPORT_SYMBOL_GPL(doc_decode_ecc);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Fabrice Bellard <fabrice.bellard@netgem.com>");
MODULE_DESCRIPTION("ECC code for correcting errors detected by DiskOnChip 2000 and Millennium ECC hardware");

325
drivers/mtd/devices/docprobe.c
View File

@ -1,325 +0,0 @@
/* Linux driver for Disk-On-Chip devices */
/* Probe routines common to all DoC devices */
/* (C) 1999 Machine Vision Holdings, Inc. */
/* (C) 1999-2003 David Woodhouse <dwmw2@infradead.org> */
/* DOC_PASSIVE_PROBE:
In order to ensure that the BIOS checksum is correct at boot time, and
hence that the onboard BIOS extension gets executed, the DiskOnChip
goes into reset mode when it is read sequentially: all registers
return 0xff until the chip is woken up again by writing to the
DOCControl register.
Unfortunately, this means that the probe for the DiskOnChip is unsafe,
because one of the first things it does is write to where it thinks
the DOCControl register should be - which may well be shared memory
for another device. I've had machines which lock up when this is
attempted. Hence the possibility to do a passive probe, which will fail
to detect a chip in reset mode, but is at least guaranteed not to lock
the machine.
If you have this problem, uncomment the following line:
#define DOC_PASSIVE_PROBE
*/
/* DOC_SINGLE_DRIVER:
Millennium driver has been merged into DOC2000 driver.
The old Millennium-only driver has been retained just in case there
are problems with the new code. If the combined driver doesn't work
for you, you can try the old one by undefining DOC_SINGLE_DRIVER
below and also enabling it in your configuration. If this fixes the
problems, please send a report to the MTD mailing list at
<linux-mtd@lists.infradead.org>.
*/
#define DOC_SINGLE_DRIVER
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/doc2000.h>
static unsigned long doc_config_location = CONFIG_MTD_DOCPROBE_ADDRESS;
module_param(doc_config_location, ulong, 0);
MODULE_PARM_DESC(doc_config_location, "Physical memory address at which to probe for DiskOnChip");
static unsigned long __initdata doc_locations[] = {
#if defined (__alpha__) || defined(__i386__) || defined(__x86_64__)
#ifdef CONFIG_MTD_DOCPROBE_HIGH
0xfffc8000, 0xfffca000, 0xfffcc000, 0xfffce000,
0xfffd0000, 0xfffd2000, 0xfffd4000, 0xfffd6000,
0xfffd8000, 0xfffda000, 0xfffdc000, 0xfffde000,
0xfffe0000, 0xfffe2000, 0xfffe4000, 0xfffe6000,
0xfffe8000, 0xfffea000, 0xfffec000, 0xfffee000,
#else /* CONFIG_MTD_DOCPROBE_HIGH */
0xc8000, 0xca000, 0xcc000, 0xce000,
0xd0000, 0xd2000, 0xd4000, 0xd6000,
0xd8000, 0xda000, 0xdc000, 0xde000,
0xe0000, 0xe2000, 0xe4000, 0xe6000,
0xe8000, 0xea000, 0xec000, 0xee000,
#endif /* CONFIG_MTD_DOCPROBE_HIGH */
#endif
0xffffffff };
/* doccheck: Probe a given memory window to see if there's a DiskOnChip present */
static inline int __init doccheck(void __iomem *potential, unsigned long physadr)
{
void __iomem *window=potential;
unsigned char tmp, tmpb, tmpc, ChipID;
#ifndef DOC_PASSIVE_PROBE
unsigned char tmp2;
#endif
/* Routine copied from the Linux DOC driver */
#ifdef CONFIG_MTD_DOCPROBE_55AA
/* Check for 0x55 0xAA signature at beginning of window,
this is no longer true once we remove the IPL (for Millennium */
if (ReadDOC(window, Sig1) != 0x55 || ReadDOC(window, Sig2) != 0xaa)
return 0;
#endif /* CONFIG_MTD_DOCPROBE_55AA */
#ifndef DOC_PASSIVE_PROBE
/* It's not possible to cleanly detect the DiskOnChip - the
* bootup procedure will put the device into reset mode, and
* it's not possible to talk to it without actually writing
* to the DOCControl register. So we store the current contents
* of the DOCControl register's location, in case we later decide
* that it's not a DiskOnChip, and want to put it back how we
* found it.
*/
tmp2 = ReadDOC(window, DOCControl);
/* Reset the DiskOnChip ASIC */
WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET,
window, DOCControl);
WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET,
window, DOCControl);
/* Enable the DiskOnChip ASIC */
WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL,
window, DOCControl);
WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL,
window, DOCControl);
#endif /* !DOC_PASSIVE_PROBE */
/* We need to read the ChipID register four times. For some
newer DiskOnChip 2000 units, the first three reads will
return the DiskOnChip Millennium ident. Don't ask. */
ChipID = ReadDOC(window, ChipID);
switch (ChipID) {
case DOC_ChipID_Doc2k:
/* Check the TOGGLE bit in the ECC register */
tmp = ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT;
tmpb = ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT;
tmpc = ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT;
if (tmp != tmpb && tmp == tmpc)
return ChipID;
break;
case DOC_ChipID_DocMil:
/* Check for the new 2000 with Millennium ASIC */
ReadDOC(window, ChipID);
ReadDOC(window, ChipID);
if (ReadDOC(window, ChipID) != DOC_ChipID_DocMil)
ChipID = DOC_ChipID_Doc2kTSOP;
/* Check the TOGGLE bit in the ECC register */
tmp = ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT;
tmpb = ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT;
tmpc = ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT;
if (tmp != tmpb && tmp == tmpc)
return ChipID;
break;
case DOC_ChipID_DocMilPlus16:
case DOC_ChipID_DocMilPlus32:
case 0:
/* Possible Millennium+, need to do more checks */
#ifndef DOC_PASSIVE_PROBE
/* Possibly release from power down mode */
for (tmp = 0; (tmp < 4); tmp++)
ReadDOC(window, Mplus_Power);
/* Reset the DiskOnChip ASIC */
tmp = DOC_MODE_RESET | DOC_MODE_MDWREN | DOC_MODE_RST_LAT |
DOC_MODE_BDECT;
WriteDOC(tmp, window, Mplus_DOCControl);
WriteDOC(~tmp, window, Mplus_CtrlConfirm);
mdelay(1);
/* Enable the DiskOnChip ASIC */
tmp = DOC_MODE_NORMAL | DOC_MODE_MDWREN | DOC_MODE_RST_LAT |
DOC_MODE_BDECT;
WriteDOC(tmp, window, Mplus_DOCControl);
WriteDOC(~tmp, window, Mplus_CtrlConfirm);
mdelay(1);
#endif /* !DOC_PASSIVE_PROBE */
ChipID = ReadDOC(window, ChipID);
switch (ChipID) {
case DOC_ChipID_DocMilPlus16:
case DOC_ChipID_DocMilPlus32:
/* Check the TOGGLE bit in the toggle register */
tmp = ReadDOC(window, Mplus_Toggle) & DOC_TOGGLE_BIT;
tmpb = ReadDOC(window, Mplus_Toggle) & DOC_TOGGLE_BIT;
tmpc = ReadDOC(window, Mplus_Toggle) & DOC_TOGGLE_BIT;
if (tmp != tmpb && tmp == tmpc)
return ChipID;
default:
break;
}
/* FALL TRHU */
default:
#ifdef CONFIG_MTD_DOCPROBE_55AA
printk(KERN_DEBUG "Possible DiskOnChip with unknown ChipID %2.2X found at 0x%lx\n",
ChipID, physadr);
#endif
#ifndef DOC_PASSIVE_PROBE
/* Put back the contents of the DOCControl register, in case it's not
* actually a DiskOnChip.
*/
WriteDOC(tmp2, window, DOCControl);
#endif
return 0;
}
printk(KERN_WARNING "DiskOnChip failed TOGGLE test, dropping.\n");
#ifndef DOC_PASSIVE_PROBE
/* Put back the contents of the DOCControl register: it's not a DiskOnChip */
WriteDOC(tmp2, window, DOCControl);
#endif
return 0;
}
static int docfound;
extern void DoC2k_init(struct mtd_info *);
extern void DoCMil_init(struct mtd_info *);
extern void DoCMilPlus_init(struct mtd_info *);
static void __init DoC_Probe(unsigned long physadr)
{
void __iomem *docptr;
struct DiskOnChip *this;
struct mtd_info *mtd;
int ChipID;
char namebuf[15];
char *name = namebuf;
void (*initroutine)(struct mtd_info *) = NULL;
docptr = ioremap(physadr, DOC_IOREMAP_LEN);
if (!docptr)
return;
if ((ChipID = doccheck(docptr, physadr))) {
if (ChipID == DOC_ChipID_Doc2kTSOP) {
/* Remove this at your own peril. The hardware driver works but nothing prevents you from erasing bad blocks */
printk(KERN_NOTICE "Refusing to drive DiskOnChip 2000 TSOP until Bad Block Table is correctly supported by INFTL\n");
iounmap(docptr);
return;
}
docfound = 1;
mtd = kzalloc(sizeof(struct DiskOnChip) + sizeof(struct mtd_info), GFP_KERNEL);
if (!mtd) {
printk(KERN_WARNING "Cannot allocate memory for data structures. Dropping.\n");
iounmap(docptr);
return;
}
this = (struct DiskOnChip *)(&mtd[1]);
mtd->priv = this;
this->virtadr = docptr;
this->physadr = physadr;
this->ChipID = ChipID;
sprintf(namebuf, "with ChipID %2.2X", ChipID);
switch(ChipID) {
case DOC_ChipID_Doc2kTSOP:
name="2000 TSOP";
initroutine = symbol_request(DoC2k_init);
break;
case DOC_ChipID_Doc2k:
name="2000";
initroutine = symbol_request(DoC2k_init);
break;
case DOC_ChipID_DocMil:
name="Millennium";
#ifdef DOC_SINGLE_DRIVER
initroutine = symbol_request(DoC2k_init);
#else
initroutine = symbol_request(DoCMil_init);
#endif /* DOC_SINGLE_DRIVER */
break;
case DOC_ChipID_DocMilPlus16:
case DOC_ChipID_DocMilPlus32:
name="MillenniumPlus";
initroutine = symbol_request(DoCMilPlus_init);
break;
}
if (initroutine) {
(*initroutine)(mtd);
symbol_put_addr(initroutine);
return;
}
printk(KERN_NOTICE "Cannot find driver for DiskOnChip %s at 0x%lX\n", name, physadr);
kfree(mtd);
}
iounmap(docptr);
}
/****************************************************************************
*
* Module stuff
*
****************************************************************************/
static int __init init_doc(void)
{
int i;
if (doc_config_location) {
printk(KERN_INFO "Using configured DiskOnChip probe address 0x%lx\n", doc_config_location);
DoC_Probe(doc_config_location);
} else {
for (i=0; (doc_locations[i] != 0xffffffff); i++) {
DoC_Probe(doc_locations[i]);
}
}
/* No banner message any more. Print a message if no DiskOnChip
found, so the user knows we at least tried. */
if (!docfound)
printk(KERN_INFO "No recognised DiskOnChip devices found\n");
return -EAGAIN;
}
module_init(init_doc);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("Probe code for DiskOnChip 2000 and Millennium devices");