linux/drivers/mtd/devices/doc2001plus.c

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/*
* Linux driver for Disk-On-Chip Millennium Plus
*
* (c) 2002-2003 Greg Ungerer <gerg@snapgear.com>
* (c) 2002-2003 SnapGear Inc
* (c) 1999 Machine Vision Holdings, Inc.
* (c) 1999, 2000 David Woodhouse <dwmw2@infradead.org>
*
* $Id: doc2001plus.c,v 1.14 2005/11/07 11:14:24 gleixner Exp $
*
* Released under GPL
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/miscdevice.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);
[MTD] Rework the out of band handling completely Hopefully the last iteration on this! The handling of out of band data on NAND was accompanied by tons of fruitless discussions and halfarsed patches to make it work for a particular problem. Sufficiently annoyed by I all those "I know it better" mails and the resonable amount of discarded "it solves my problem" patches, I finally decided to go for the big rework. After removing the _ecc variants of mtd read/write functions the solution to satisfy the various requirements was to refactor the read/write _oob functions in mtd. The major change is that read/write_oob now takes a pointer to an operation descriptor structure "struct mtd_oob_ops".instead of having a function with at least seven arguments. read/write_oob which should probably renamed to a more descriptive name, can do the following tasks: - read/write out of band data - read/write data content and out of band data - read/write raw data content and out of band data (ecc disabled) struct mtd_oob_ops has a mode field, which determines the oob handling mode. Aside of the MTD_OOB_RAW mode, which is intended to be especially for diagnostic purposes and some internal functions e.g. bad block table creation, the other two modes are for mtd clients: MTD_OOB_PLACE puts/gets the given oob data exactly to/from the place which is described by the ooboffs and ooblen fields of the mtd_oob_ops strcuture. It's up to the caller to make sure that the byte positions are not used by the ECC placement algorithms. MTD_OOB_AUTO puts/gets the given oob data automaticaly to/from the places in the out of band area which are described by the oobfree tuples in the ecclayout data structre which is associated to the devicee. The decision whether data plus oob or oob only handling is done depends on the setting of the datbuf member of the data structure. When datbuf == NULL then the internal read/write_oob functions are selected, otherwise the read/write data routines are invoked. Tested on a few platforms with all variants. Please be aware of possible regressions for your particular device / application scenario Disclaimer: Any whining will be ignored from those who just contributed "hot air blurb" and never sat down to tackle the underlying problem of the mess in the NAND driver grown over time and the big chunk of work to fix up the existing users. The problem was not the holiness of the existing MTD interfaces. The problems was the lack of time to go for the big overhaul. It's easy to add more mess to the existing one, but it takes alot of effort to go for a real solution. Improvements and bugfixes are welcome! Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-29 01:26:58 +00:00
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 *docmilpluslist = NULL;
/* Perform the required delay cycles by writing to the NOP register */
static void DoC_Delay(void __iomem * docptr, int cycles)
{
int i;
for (i = 0; (i < cycles); i++)
WriteDOC(0, docptr, Mplus_NOP);
}
#define CDSN_CTRL_FR_B_MASK (CDSN_CTRL_FR_B0 | CDSN_CTRL_FR_B1)
/* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */
static int _DoC_WaitReady(void __iomem * docptr)
{
unsigned int c = 0xffff;
DEBUG(MTD_DEBUG_LEVEL3,
"_DoC_WaitReady called for out-of-line wait\n");
/* Out-of-line routine to wait for chip response */
while (((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK) && --c)
;
if (c == 0)
DEBUG(MTD_DEBUG_LEVEL2, "_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;
/* read form NOP register should be issued prior to the read from CDSNControl
see Software Requirement 11.4 item 2. */
DoC_Delay(docptr, 4);
if ((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK)
/* Call the out-of-line routine to wait */
ret = _DoC_WaitReady(docptr);
return ret;
}
/* For some reason the Millennium Plus seems to occassionally put itself
* into reset mode. For me this happens randomly, with no pattern that I
* can detect. M-systems suggest always check this on any block level
* operation and setting to normal mode if in reset mode.
*/
static inline void DoC_CheckASIC(void __iomem * docptr)
{
/* Make sure the DoC is in normal mode */
if ((ReadDOC(docptr, Mplus_DOCControl) & DOC_MODE_NORMAL) == 0) {
WriteDOC((DOC_MODE_NORMAL | DOC_MODE_MDWREN), docptr, Mplus_DOCControl);
WriteDOC(~(DOC_MODE_NORMAL | DOC_MODE_MDWREN), docptr, Mplus_CtrlConfirm);
}
}
/* DoC_Command: Send a flash command to the flash chip through the Flash
* command register. Need 2 Write Pipeline Terminates to complete send.
*/
static void DoC_Command(void __iomem * docptr, unsigned char command,
unsigned char xtraflags)
{
WriteDOC(command, docptr, Mplus_FlashCmd);
WriteDOC(command, docptr, Mplus_WritePipeTerm);
WriteDOC(command, docptr, Mplus_WritePipeTerm);
}
/* DoC_Address: Set the current address for the flash chip through the Flash
* Address register. Need 2 Write Pipeline Terminates to complete send.
*/
static inline void DoC_Address(struct DiskOnChip *doc, int numbytes,
unsigned long ofs, unsigned char xtraflags1,
unsigned char xtraflags2)
{
void __iomem * docptr = doc->virtadr;
/* Allow for possible Mill Plus internal flash interleaving */
ofs >>= doc->interleave;
switch (numbytes) {
case 1:
/* Send single byte, bits 0-7. */
WriteDOC(ofs & 0xff, docptr, Mplus_FlashAddress);
break;
case 2:
/* Send bits 9-16 followed by 17-23 */
WriteDOC((ofs >> 9) & 0xff, docptr, Mplus_FlashAddress);
WriteDOC((ofs >> 17) & 0xff, docptr, Mplus_FlashAddress);
break;
case 3:
/* Send 0-7, 9-16, then 17-23 */
WriteDOC(ofs & 0xff, docptr, Mplus_FlashAddress);
WriteDOC((ofs >> 9) & 0xff, docptr, Mplus_FlashAddress);
WriteDOC((ofs >> 17) & 0xff, docptr, Mplus_FlashAddress);
break;
default:
return;
}
WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
}
/* DoC_SelectChip: Select a given flash chip within the current floor */
static int DoC_SelectChip(void __iomem * docptr, int chip)
{
/* No choice for flash chip on Millennium Plus */
return 0;
}
/* DoC_SelectFloor: Select a given floor (bank of flash chips) */
static int DoC_SelectFloor(void __iomem * docptr, int floor)
{
WriteDOC((floor & 0x3), docptr, Mplus_DeviceSelect);
return 0;
}
/*
* Translate the given offset into the appropriate command and offset.
* This does the mapping using the 16bit interleave layout defined by
* M-Systems, and looks like this for a sector pair:
* +-----------+-------+-------+-------+--------------+---------+-----------+
* | 0 --- 511 |512-517|518-519|520-521| 522 --- 1033 |1034-1039|1040 - 1055|
* +-----------+-------+-------+-------+--------------+---------+-----------+
* | Data 0 | ECC 0 |Flags0 |Flags1 | Data 1 |ECC 1 | OOB 1 + 2 |
* +-----------+-------+-------+-------+--------------+---------+-----------+
*/
/* FIXME: This lives in INFTL not here. Other users of flash devices
may not want it */
static unsigned int DoC_GetDataOffset(struct mtd_info *mtd, loff_t *from)
{
struct DiskOnChip *this = mtd->priv;
if (this->interleave) {
unsigned int ofs = *from & 0x3ff;
unsigned int cmd;
if (ofs < 512) {
cmd = NAND_CMD_READ0;
ofs &= 0x1ff;
} else if (ofs < 1014) {
cmd = NAND_CMD_READ1;
ofs = (ofs & 0x1ff) + 10;
} else {
cmd = NAND_CMD_READOOB;
ofs = ofs - 1014;
}
*from = (*from & ~0x3ff) | ofs;
return cmd;
} else {
/* No interleave */
if ((*from) & 0x100)
return NAND_CMD_READ1;
return NAND_CMD_READ0;
}
}
static unsigned int DoC_GetECCOffset(struct mtd_info *mtd, loff_t *from)
{
unsigned int ofs, cmd;
if (*from & 0x200) {
cmd = NAND_CMD_READOOB;
ofs = 10 + (*from & 0xf);
} else {
cmd = NAND_CMD_READ1;
ofs = (*from & 0xf);
}
*from = (*from & ~0x3ff) | ofs;
return cmd;
}
static unsigned int DoC_GetFlagsOffset(struct mtd_info *mtd, loff_t *from)
{
unsigned int ofs, cmd;
cmd = NAND_CMD_READ1;
ofs = (*from & 0x200) ? 8 : 6;
*from = (*from & ~0x3ff) | ofs;
return cmd;
}
static unsigned int DoC_GetHdrOffset(struct mtd_info *mtd, loff_t *from)
{
unsigned int ofs, cmd;
cmd = NAND_CMD_READOOB;
ofs = (*from & 0x200) ? 24 : 16;
*from = (*from & ~0x3ff) | ofs;
return cmd;
}
static inline void MemReadDOC(void __iomem * docptr, unsigned char *buf, int len)
{
#ifndef USE_MEMCPY
int i;
for (i = 0; i < len; i++)
buf[i] = ReadDOC(docptr, Mil_CDSN_IO + i);
#else
memcpy_fromio(buf, docptr + DoC_Mil_CDSN_IO, len);
#endif
}
static inline void MemWriteDOC(void __iomem * docptr, unsigned char *buf, int len)
{
#ifndef USE_MEMCPY
int i;
for (i = 0; i < len; i++)
WriteDOC(buf[i], docptr, Mil_CDSN_IO + i);
#else
memcpy_toio(docptr + DoC_Mil_CDSN_IO, buf, len);
#endif
}
/* 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;
void __iomem * docptr = doc->virtadr;
/* Page in the required floor/chip */
DoC_SelectFloor(docptr, floor);
DoC_SelectChip(docptr, chip);
/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);
/* Reset the chip, see Software Requirement 11.4 item 1. */
DoC_Command(docptr, NAND_CMD_RESET, 0);
DoC_WaitReady(docptr);
/* Read the NAND chip ID: 1. Send ReadID command */
DoC_Command(docptr, NAND_CMD_READID, 0);
/* Read the NAND chip ID: 2. Send address byte zero */
DoC_Address(doc, 1, 0x00, 0, 0x00);
WriteDOC(0, docptr, Mplus_FlashControl);
DoC_WaitReady(docptr);
/* Read the manufacturer and device id codes of the flash device through
CDSN IO register see Software Requirement 11.4 item 5.*/
dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
mfr = ReadDOC(docptr, Mil_CDSN_IO);
if (doc->interleave)
dummy = ReadDOC(docptr, Mil_CDSN_IO); /* 2 way interleave */
id = ReadDOC(docptr, Mil_CDSN_IO);
if (doc->interleave)
dummy = ReadDOC(docptr, Mil_CDSN_IO); /* 2 way interleave */
dummy = ReadDOC(docptr, Mplus_LastDataRead);
dummy = ReadDOC(docptr, Mplus_LastDataRead);
/* Disable flash internally */
WriteDOC(0, docptr, Mplus_FlashSelect);
/* No response - return failure */
if (mfr == 0xff || mfr == 0)
return 0;
for (i = 0; nand_flash_ids[i].name != NULL; i++) {
if (id == nand_flash_ids[i].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;
doc->erasesize = nand_flash_ids[i].erasesize << doc->interleave;
break;
}
}
if (nand_flash_ids[i].name == NULL)
return 0;
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_MPLUS];
int ret;
this->numchips = 0;
this->mfr = 0;
this->id = 0;
/* Work out the intended interleave setting */
this->interleave = 0;
if (this->ChipID == DOC_ChipID_DocMilPlus32)
this->interleave = 1;
/* Check the ASIC agrees */
if ( (this->interleave << 2) !=
(ReadDOC(this->virtadr, Mplus_Configuration) & 4)) {
u_char conf = ReadDOC(this->virtadr, Mplus_Configuration);
printk(KERN_NOTICE "Setting DiskOnChip Millennium Plus interleave to %s\n",
this->interleave?"on (16-bit)":"off (8-bit)");
conf ^= 4;
WriteDOC(conf, this->virtadr, Mplus_Configuration);
}
/* For each floor, find the number of valid chips it contains */
for (floor = 0,ret = 1; floor < MAX_FLOORS_MPLUS; floor++) {
numchips[floor] = 0;
for (chip = 0; chip < MAX_CHIPS_MPLUS && 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("MTD: 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_MPLUS; 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 DoCMilPlus_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 Millennium docs), but it seems to work. */
tmp1 = ReadDOC(doc1->virtadr, Mplus_AliasResolution);
tmp2 = ReadDOC(doc2->virtadr, Mplus_AliasResolution);
if (tmp1 != tmp2)
return 0;
WriteDOC((tmp1+1) % 0xff, doc1->virtadr, Mplus_AliasResolution);
tmp2 = ReadDOC(doc2->virtadr, Mplus_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, Mplus_AliasResolution);
return retval;
}
/* This routine is found from the docprobe code by symbol_get(),
* which will bump the use count of this module. */
void DoCMilPlus_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 (docmilpluslist)
old = docmilpluslist->priv;
while (old) {
if (DoCMilPlus_is_alias(this, old)) {
printk(KERN_NOTICE "Ignoring DiskOnChip Millennium "
"Plus 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 Plus";
printk(KERN_NOTICE "DiskOnChip Millennium Plus found at "
"address 0x%lX\n", this->physadr);
mtd->type = MTD_NANDFLASH;
mtd->flags = MTD_CAP_NANDFLASH;
mtd->size = 0;
mtd->erasesize = 0;
mtd->writesize = 512;
mtd->oobsize = 16;
mtd->owner = THIS_MODULE;
mtd->erase = doc_erase;
mtd->point = NULL;
mtd->unpoint = NULL;
mtd->read = doc_read;
mtd->write = doc_write;
mtd->read_oob = doc_read_oob;
mtd->write_oob = doc_write_oob;
mtd->sync = NULL;
this->totlen = 0;
this->numchips = 0;
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 = docmilpluslist;
docmilpluslist = mtd;
mtd->size = this->totlen;
mtd->erasesize = this->erasesize;
add_mtd_device(mtd);
return;
}
}
EXPORT_SYMBOL_GPL(DoCMilPlus_init);
#if 0
static int doc_dumpblk(struct mtd_info *mtd, loff_t from)
{
int i;
loff_t fofs;
struct DiskOnChip *this = mtd->priv;
void __iomem * docptr = this->virtadr;
struct Nand *mychip = &this->chips[from >> (this->chipshift)];
unsigned char *bp, buf[1056];
char c[32];
from &= ~0x3ff;
/* Don't allow read past end of device */
if (from >= this->totlen)
return -EINVAL;
DoC_CheckASIC(docptr);
/* 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;
/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);
/* Reset the chip, see Software Requirement 11.4 item 1. */
DoC_Command(docptr, NAND_CMD_RESET, 0);
DoC_WaitReady(docptr);
fofs = from;
DoC_Command(docptr, DoC_GetDataOffset(mtd, &fofs), 0);
DoC_Address(this, 3, fofs, 0, 0x00);
WriteDOC(0, docptr, Mplus_FlashControl);
DoC_WaitReady(docptr);
/* disable the ECC engine */
WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
ReadDOC(docptr, Mplus_ReadPipeInit);
ReadDOC(docptr, Mplus_ReadPipeInit);
/* Read the data via the internal pipeline through CDSN IO
register, see Pipelined Read Operations 11.3 */
MemReadDOC(docptr, buf, 1054);
buf[1054] = ReadDOC(docptr, Mplus_LastDataRead);
buf[1055] = ReadDOC(docptr, Mplus_LastDataRead);
memset(&c[0], 0, sizeof(c));
printk("DUMP OFFSET=%x:\n", (int)from);
for (i = 0, bp = &buf[0]; (i < 1056); i++) {
if ((i % 16) == 0)
printk("%08x: ", i);
printk(" %02x", *bp);
c[(i & 0xf)] = ((*bp >= 0x20) && (*bp <= 0x7f)) ? *bp : '.';
bp++;
if (((i + 1) % 16) == 0)
printk(" %s\n", c);
}
printk("\n");
/* Disable flash internally */
WriteDOC(0, docptr, Mplus_FlashSelect);
return 0;
}
#endif
static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
int ret, i;
volatile char dummy;
loff_t fofs;
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 read past end of device */
if (from >= this->totlen)
return -EINVAL;
/* Don't allow a single read to cross a 512-byte block boundary */
if (from + len > ((from | 0x1ff) + 1))
len = ((from | 0x1ff) + 1) - from;
DoC_CheckASIC(docptr);
/* 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;
/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);
/* Reset the chip, see Software Requirement 11.4 item 1. */
DoC_Command(docptr, NAND_CMD_RESET, 0);
DoC_WaitReady(docptr);
fofs = from;
DoC_Command(docptr, DoC_GetDataOffset(mtd, &fofs), 0);
DoC_Address(this, 3, fofs, 0, 0x00);
WriteDOC(0, docptr, Mplus_FlashControl);
DoC_WaitReady(docptr);
/* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
WriteDOC(DOC_ECC_EN, docptr, Mplus_ECCConf);
/* Let the caller know we completed it */
*retlen = len;
ret = 0;
ReadDOC(docptr, Mplus_ReadPipeInit);
ReadDOC(docptr, Mplus_ReadPipeInit);
/* Read the data via the internal pipeline through CDSN IO
register, see Pipelined Read Operations 11.3 */
MemReadDOC(docptr, buf, len);
/* Read the ECC data following raw data */
MemReadDOC(docptr, eccbuf, 4);
eccbuf[4] = ReadDOC(docptr, Mplus_LastDataRead);
eccbuf[5] = ReadDOC(docptr, Mplus_LastDataRead);
/* Flush the pipeline */
dummy = ReadDOC(docptr, Mplus_ECCConf);
dummy = ReadDOC(docptr, Mplus_ECCConf);
/* Check the ECC Status */
if (ReadDOC(docptr, Mplus_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 syndrom 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, Mplus_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 */
#ifdef ECC_DEBUG
printk("%s(%d): Millennium Plus ECC error (from=0x%x:\n",
__FILE__, __LINE__, (int)from);
printk(" syndrome= %02x:%02x:%02x:%02x:%02x:"
"%02x\n",
syndrome[0], syndrome[1], syndrome[2],
syndrome[3], syndrome[4], syndrome[5]);
printk(" eccbuf= %02x:%02x:%02x:%02x:%02x:"
"%02x\n",
eccbuf[0], eccbuf[1], eccbuf[2],
eccbuf[3], eccbuf[4], eccbuf[5]);
#endif
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 , Mplus_ECCConf);
/* Disable flash internally */
WriteDOC(0, docptr, Mplus_FlashSelect);
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, before, ret = 0;
loff_t fto;
volatile char dummy;
char eccbuf[6];
struct DiskOnChip *this = mtd->priv;
void __iomem * docptr = this->virtadr;
struct Nand *mychip = &this->chips[to >> (this->chipshift)];
/* Don't allow write past end of device */
if (to >= this->totlen)
return -EINVAL;
/* Don't allow writes which aren't exactly one block (512 bytes) */
if ((to & 0x1ff) || (len != 0x200))
return -EINVAL;
/* Determine position of OOB flags, before or after data */
before = (this->interleave && (to & 0x200));
DoC_CheckASIC(docptr);
/* 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;
/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
WriteDOC(DOC_FLASH_CE, docptr, Mplus_FlashSelect);
/* Reset the chip, see Software Requirement 11.4 item 1. */
DoC_Command(docptr, NAND_CMD_RESET, 0);
DoC_WaitReady(docptr);
/* Set device to appropriate plane of flash */
fto = to;
WriteDOC(DoC_GetDataOffset(mtd, &fto), docptr, Mplus_FlashCmd);
/* On interleaved devices the flags for 2nd half 512 are before data */
if (eccbuf && before)
fto -= 2;
/* issue the Serial Data In command to initial the Page Program process */
DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
DoC_Address(this, 3, fto, 0x00, 0x00);
/* Disable the ECC engine */
WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
if (before) {
/* Write the block status BLOCK_USED (0x5555) */
WriteDOC(0x55, docptr, Mil_CDSN_IO);
WriteDOC(0x55, docptr, Mil_CDSN_IO);
}
/* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, Mplus_ECCConf);
MemWriteDOC(docptr, (unsigned char *) buf, len);
/* Write ECC data to flash, the ECC info is generated by
the DiskOnChip ECC logic see Reed-Solomon EDC/ECC 11.1 */
DoC_Delay(docptr, 3);
/* Read the ECC data through the DiskOnChip ECC logic */
for (i = 0; i < 6; i++)
eccbuf[i] = ReadDOC(docptr, Mplus_ECCSyndrome0 + i);
/* disable the ECC engine */
WriteDOC(DOC_ECC_DIS, docptr, Mplus_ECCConf);
/* Write the ECC data to flash */
MemWriteDOC(docptr, eccbuf, 6);
if (!before) {
/* Write the block status BLOCK_USED (0x5555) */
WriteDOC(0x55, docptr, Mil_CDSN_IO+6);
WriteDOC(0x55, docptr, Mil_CDSN_IO+7);
}
#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
WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
WriteDOC(0x00, docptr, Mplus_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, 0);
dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
DoC_Delay(docptr, 2);
if ((dummy = ReadDOC(docptr, Mplus_LastDataRead)) & 1) {
printk("MTD: Error 0x%x programming at 0x%x\n", dummy, (int)to);
/* Error in programming
FIXME: implement Bad Block Replacement (in nftl.c ??) */
*retlen = 0;
ret = -EIO;
}
dummy = ReadDOC(docptr, Mplus_LastDataRead);
/* Disable flash internally */
WriteDOC(0, docptr, Mplus_FlashSelect);
/* Let the caller know we completed it */
*retlen = len;
return ret;
}
[MTD] Rework the out of band handling completely Hopefully the last iteration on this! The handling of out of band data on NAND was accompanied by tons of fruitless discussions and halfarsed patches to make it work for a particular problem. Sufficiently annoyed by I all those "I know it better" mails and the resonable amount of discarded "it solves my problem" patches, I finally decided to go for the big rework. After removing the _ecc variants of mtd read/write functions the solution to satisfy the various requirements was to refactor the read/write _oob functions in mtd. The major change is that read/write_oob now takes a pointer to an operation descriptor structure "struct mtd_oob_ops".instead of having a function with at least seven arguments. read/write_oob which should probably renamed to a more descriptive name, can do the following tasks: - read/write out of band data - read/write data content and out of band data - read/write raw data content and out of band data (ecc disabled) struct mtd_oob_ops has a mode field, which determines the oob handling mode. Aside of the MTD_OOB_RAW mode, which is intended to be especially for diagnostic purposes and some internal functions e.g. bad block table creation, the other two modes are for mtd clients: MTD_OOB_PLACE puts/gets the given oob data exactly to/from the place which is described by the ooboffs and ooblen fields of the mtd_oob_ops strcuture. It's up to the caller to make sure that the byte positions are not used by the ECC placement algorithms. MTD_OOB_AUTO puts/gets the given oob data automaticaly to/from the places in the out of band area which are described by the oobfree tuples in the ecclayout data structre which is associated to the devicee. The decision whether data plus oob or oob only handling is done depends on the setting of the datbuf member of the data structure. When datbuf == NULL then the internal read/write_oob functions are selected, otherwise the read/write data routines are invoked. Tested on a few platforms with all variants. Please be aware of possible regressions for your particular device / application scenario Disclaimer: Any whining will be ignored from those who just contributed "hot air blurb" and never sat down to tackle the underlying problem of the mess in the NAND driver grown over time and the big chunk of work to fix up the existing users. The problem was not the holiness of the existing MTD interfaces. The problems was the lack of time to go for the big overhaul. It's easy to add more mess to the existing one, but it takes alot of effort to go for a real solution. Improvements and bugfixes are welcome! Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-29 01:26:58 +00:00
static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
struct mtd_oob_ops *ops)
{
loff_t fofs, base;
struct DiskOnChip *this = mtd->priv;
void __iomem * docptr = this->virtadr;
struct Nand *mychip = &this->chips[ofs >> this->chipshift];
size_t i, size, got, want;
[MTD] Rework the out of band handling completely Hopefully the last iteration on this! The handling of out of band data on NAND was accompanied by tons of fruitless discussions and halfarsed patches to make it work for a particular problem. Sufficiently annoyed by I all those "I know it better" mails and the resonable amount of discarded "it solves my problem" patches, I finally decided to go for the big rework. After removing the _ecc variants of mtd read/write functions the solution to satisfy the various requirements was to refactor the read/write _oob functions in mtd. The major change is that read/write_oob now takes a pointer to an operation descriptor structure "struct mtd_oob_ops".instead of having a function with at least seven arguments. read/write_oob which should probably renamed to a more descriptive name, can do the following tasks: - read/write out of band data - read/write data content and out of band data - read/write raw data content and out of band data (ecc disabled) struct mtd_oob_ops has a mode field, which determines the oob handling mode. Aside of the MTD_OOB_RAW mode, which is intended to be especially for diagnostic purposes and some internal functions e.g. bad block table creation, the other two modes are for mtd clients: MTD_OOB_PLACE puts/gets the given oob data exactly to/from the place which is described by the ooboffs and ooblen fields of the mtd_oob_ops strcuture. It's up to the caller to make sure that the byte positions are not used by the ECC placement algorithms. MTD_OOB_AUTO puts/gets the given oob data automaticaly to/from the places in the out of band area which are described by the oobfree tuples in the ecclayout data structre which is associated to the devicee. The decision whether data plus oob or oob only handling is done depends on the setting of the datbuf member of the data structure. When datbuf == NULL then the internal read/write_oob functions are selected, otherwise the read/write data routines are invoked. Tested on a few platforms with all variants. Please be aware of possible regressions for your particular device / application scenario Disclaimer: Any whining will be ignored from those who just contributed "hot air blurb" and never sat down to tackle the underlying problem of the mess in the NAND driver grown over time and the big chunk of work to fix up the existing users. The problem was not the holiness of the existing MTD interfaces. The problems was the lack of time to go for the big overhaul. It's easy to add more mess to the existing one, but it takes alot of effort to go for a real solution. Improvements and bugfixes are welcome! Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-29 01:26:58 +00:00
uint8_t *buf = ops->oobbuf;
size_t len = ops->len;
BUG_ON(ops->mode != MTD_OOB_PLACE);
ofs += ops->ooboffs;
DoC_CheckASIC(docptr);
/* 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;
/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);
/* disable the ECC engine */
WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
DoC_WaitReady(docptr);
/* Maximum of 16 bytes in the OOB region, so limit read to that */
if (len > 16)
len = 16;
got = 0;
want = len;
for (i = 0; ((i < 3) && (want > 0)); i++) {
/* Figure out which region we are accessing... */
fofs = ofs;
base = ofs & 0xf;
if (!this->interleave) {
DoC_Command(docptr, NAND_CMD_READOOB, 0);
size = 16 - base;
} else if (base < 6) {
DoC_Command(docptr, DoC_GetECCOffset(mtd, &fofs), 0);
size = 6 - base;
} else if (base < 8) {
DoC_Command(docptr, DoC_GetFlagsOffset(mtd, &fofs), 0);
size = 8 - base;
} else {
DoC_Command(docptr, DoC_GetHdrOffset(mtd, &fofs), 0);
size = 16 - base;
}
if (size > want)
size = want;
/* Issue read command */
DoC_Address(this, 3, fofs, 0, 0x00);
WriteDOC(0, docptr, Mplus_FlashControl);
DoC_WaitReady(docptr);
ReadDOC(docptr, Mplus_ReadPipeInit);
ReadDOC(docptr, Mplus_ReadPipeInit);
MemReadDOC(docptr, &buf[got], size - 2);
buf[got + size - 2] = ReadDOC(docptr, Mplus_LastDataRead);
buf[got + size - 1] = ReadDOC(docptr, Mplus_LastDataRead);
ofs += size;
got += size;
want -= size;
}
/* Disable flash internally */
WriteDOC(0, docptr, Mplus_FlashSelect);
[MTD] Rework the out of band handling completely Hopefully the last iteration on this! The handling of out of band data on NAND was accompanied by tons of fruitless discussions and halfarsed patches to make it work for a particular problem. Sufficiently annoyed by I all those "I know it better" mails and the resonable amount of discarded "it solves my problem" patches, I finally decided to go for the big rework. After removing the _ecc variants of mtd read/write functions the solution to satisfy the various requirements was to refactor the read/write _oob functions in mtd. The major change is that read/write_oob now takes a pointer to an operation descriptor structure "struct mtd_oob_ops".instead of having a function with at least seven arguments. read/write_oob which should probably renamed to a more descriptive name, can do the following tasks: - read/write out of band data - read/write data content and out of band data - read/write raw data content and out of band data (ecc disabled) struct mtd_oob_ops has a mode field, which determines the oob handling mode. Aside of the MTD_OOB_RAW mode, which is intended to be especially for diagnostic purposes and some internal functions e.g. bad block table creation, the other two modes are for mtd clients: MTD_OOB_PLACE puts/gets the given oob data exactly to/from the place which is described by the ooboffs and ooblen fields of the mtd_oob_ops strcuture. It's up to the caller to make sure that the byte positions are not used by the ECC placement algorithms. MTD_OOB_AUTO puts/gets the given oob data automaticaly to/from the places in the out of band area which are described by the oobfree tuples in the ecclayout data structre which is associated to the devicee. The decision whether data plus oob or oob only handling is done depends on the setting of the datbuf member of the data structure. When datbuf == NULL then the internal read/write_oob functions are selected, otherwise the read/write data routines are invoked. Tested on a few platforms with all variants. Please be aware of possible regressions for your particular device / application scenario Disclaimer: Any whining will be ignored from those who just contributed "hot air blurb" and never sat down to tackle the underlying problem of the mess in the NAND driver grown over time and the big chunk of work to fix up the existing users. The problem was not the holiness of the existing MTD interfaces. The problems was the lack of time to go for the big overhaul. It's easy to add more mess to the existing one, but it takes alot of effort to go for a real solution. Improvements and bugfixes are welcome! Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-29 01:26:58 +00:00
ops->retlen = len;
return 0;
}
[MTD] Rework the out of band handling completely Hopefully the last iteration on this! The handling of out of band data on NAND was accompanied by tons of fruitless discussions and halfarsed patches to make it work for a particular problem. Sufficiently annoyed by I all those "I know it better" mails and the resonable amount of discarded "it solves my problem" patches, I finally decided to go for the big rework. After removing the _ecc variants of mtd read/write functions the solution to satisfy the various requirements was to refactor the read/write _oob functions in mtd. The major change is that read/write_oob now takes a pointer to an operation descriptor structure "struct mtd_oob_ops".instead of having a function with at least seven arguments. read/write_oob which should probably renamed to a more descriptive name, can do the following tasks: - read/write out of band data - read/write data content and out of band data - read/write raw data content and out of band data (ecc disabled) struct mtd_oob_ops has a mode field, which determines the oob handling mode. Aside of the MTD_OOB_RAW mode, which is intended to be especially for diagnostic purposes and some internal functions e.g. bad block table creation, the other two modes are for mtd clients: MTD_OOB_PLACE puts/gets the given oob data exactly to/from the place which is described by the ooboffs and ooblen fields of the mtd_oob_ops strcuture. It's up to the caller to make sure that the byte positions are not used by the ECC placement algorithms. MTD_OOB_AUTO puts/gets the given oob data automaticaly to/from the places in the out of band area which are described by the oobfree tuples in the ecclayout data structre which is associated to the devicee. The decision whether data plus oob or oob only handling is done depends on the setting of the datbuf member of the data structure. When datbuf == NULL then the internal read/write_oob functions are selected, otherwise the read/write data routines are invoked. Tested on a few platforms with all variants. Please be aware of possible regressions for your particular device / application scenario Disclaimer: Any whining will be ignored from those who just contributed "hot air blurb" and never sat down to tackle the underlying problem of the mess in the NAND driver grown over time and the big chunk of work to fix up the existing users. The problem was not the holiness of the existing MTD interfaces. The problems was the lack of time to go for the big overhaul. It's easy to add more mess to the existing one, but it takes alot of effort to go for a real solution. Improvements and bugfixes are welcome! Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-29 01:26:58 +00:00
static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
struct mtd_oob_ops *ops)
{
volatile char dummy;
loff_t fofs, base;
struct DiskOnChip *this = mtd->priv;
void __iomem * docptr = this->virtadr;
struct Nand *mychip = &this->chips[ofs >> this->chipshift];
size_t i, size, got, want;
int ret = 0;
[MTD] Rework the out of band handling completely Hopefully the last iteration on this! The handling of out of band data on NAND was accompanied by tons of fruitless discussions and halfarsed patches to make it work for a particular problem. Sufficiently annoyed by I all those "I know it better" mails and the resonable amount of discarded "it solves my problem" patches, I finally decided to go for the big rework. After removing the _ecc variants of mtd read/write functions the solution to satisfy the various requirements was to refactor the read/write _oob functions in mtd. The major change is that read/write_oob now takes a pointer to an operation descriptor structure "struct mtd_oob_ops".instead of having a function with at least seven arguments. read/write_oob which should probably renamed to a more descriptive name, can do the following tasks: - read/write out of band data - read/write data content and out of band data - read/write raw data content and out of band data (ecc disabled) struct mtd_oob_ops has a mode field, which determines the oob handling mode. Aside of the MTD_OOB_RAW mode, which is intended to be especially for diagnostic purposes and some internal functions e.g. bad block table creation, the other two modes are for mtd clients: MTD_OOB_PLACE puts/gets the given oob data exactly to/from the place which is described by the ooboffs and ooblen fields of the mtd_oob_ops strcuture. It's up to the caller to make sure that the byte positions are not used by the ECC placement algorithms. MTD_OOB_AUTO puts/gets the given oob data automaticaly to/from the places in the out of band area which are described by the oobfree tuples in the ecclayout data structre which is associated to the devicee. The decision whether data plus oob or oob only handling is done depends on the setting of the datbuf member of the data structure. When datbuf == NULL then the internal read/write_oob functions are selected, otherwise the read/write data routines are invoked. Tested on a few platforms with all variants. Please be aware of possible regressions for your particular device / application scenario Disclaimer: Any whining will be ignored from those who just contributed "hot air blurb" and never sat down to tackle the underlying problem of the mess in the NAND driver grown over time and the big chunk of work to fix up the existing users. The problem was not the holiness of the existing MTD interfaces. The problems was the lack of time to go for the big overhaul. It's easy to add more mess to the existing one, but it takes alot of effort to go for a real solution. Improvements and bugfixes are welcome! Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-29 01:26:58 +00:00
uint8_t *buf = ops->oobbuf;
size_t len = ops->len;
BUG_ON(ops->mode != MTD_OOB_PLACE);
ofs += ops->ooboffs;
DoC_CheckASIC(docptr);
/* 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;
/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
WriteDOC(DOC_FLASH_CE, docptr, Mplus_FlashSelect);
/* Maximum of 16 bytes in the OOB region, so limit write to that */
if (len > 16)
len = 16;
got = 0;
want = len;
for (i = 0; ((i < 3) && (want > 0)); i++) {
/* Reset the chip, see Software Requirement 11.4 item 1. */
DoC_Command(docptr, NAND_CMD_RESET, 0);
DoC_WaitReady(docptr);
/* Figure out which region we are accessing... */
fofs = ofs;
base = ofs & 0x0f;
if (!this->interleave) {
WriteDOC(NAND_CMD_READOOB, docptr, Mplus_FlashCmd);
size = 16 - base;
} else if (base < 6) {
WriteDOC(DoC_GetECCOffset(mtd, &fofs), docptr, Mplus_FlashCmd);
size = 6 - base;
} else if (base < 8) {
WriteDOC(DoC_GetFlagsOffset(mtd, &fofs), docptr, Mplus_FlashCmd);
size = 8 - base;
} else {
WriteDOC(DoC_GetHdrOffset(mtd, &fofs), docptr, Mplus_FlashCmd);
size = 16 - base;
}
if (size > want)
size = want;
/* Issue the Serial Data In command to initial the Page Program process */
DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
DoC_Address(this, 3, fofs, 0, 0x00);
/* Disable the ECC engine */
WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
/* Write the data via the internal pipeline through CDSN IO
register, see Pipelined Write Operations 11.2 */
MemWriteDOC(docptr, (unsigned char *) &buf[got], size);
WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
WriteDOC(0x00, docptr, Mplus_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, Mplus_ReadPipeInit);
dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
DoC_Delay(docptr, 2);
if ((dummy = ReadDOC(docptr, Mplus_LastDataRead)) & 1) {
printk("MTD: Error 0x%x programming oob at 0x%x\n",
dummy, (int)ofs);
/* FIXME: implement Bad Block Replacement */
[MTD] Rework the out of band handling completely Hopefully the last iteration on this! The handling of out of band data on NAND was accompanied by tons of fruitless discussions and halfarsed patches to make it work for a particular problem. Sufficiently annoyed by I all those "I know it better" mails and the resonable amount of discarded "it solves my problem" patches, I finally decided to go for the big rework. After removing the _ecc variants of mtd read/write functions the solution to satisfy the various requirements was to refactor the read/write _oob functions in mtd. The major change is that read/write_oob now takes a pointer to an operation descriptor structure "struct mtd_oob_ops".instead of having a function with at least seven arguments. read/write_oob which should probably renamed to a more descriptive name, can do the following tasks: - read/write out of band data - read/write data content and out of band data - read/write raw data content and out of band data (ecc disabled) struct mtd_oob_ops has a mode field, which determines the oob handling mode. Aside of the MTD_OOB_RAW mode, which is intended to be especially for diagnostic purposes and some internal functions e.g. bad block table creation, the other two modes are for mtd clients: MTD_OOB_PLACE puts/gets the given oob data exactly to/from the place which is described by the ooboffs and ooblen fields of the mtd_oob_ops strcuture. It's up to the caller to make sure that the byte positions are not used by the ECC placement algorithms. MTD_OOB_AUTO puts/gets the given oob data automaticaly to/from the places in the out of band area which are described by the oobfree tuples in the ecclayout data structre which is associated to the devicee. The decision whether data plus oob or oob only handling is done depends on the setting of the datbuf member of the data structure. When datbuf == NULL then the internal read/write_oob functions are selected, otherwise the read/write data routines are invoked. Tested on a few platforms with all variants. Please be aware of possible regressions for your particular device / application scenario Disclaimer: Any whining will be ignored from those who just contributed "hot air blurb" and never sat down to tackle the underlying problem of the mess in the NAND driver grown over time and the big chunk of work to fix up the existing users. The problem was not the holiness of the existing MTD interfaces. The problems was the lack of time to go for the big overhaul. It's easy to add more mess to the existing one, but it takes alot of effort to go for a real solution. Improvements and bugfixes are welcome! Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-29 01:26:58 +00:00
ops->retlen = 0;
ret = -EIO;
}
dummy = ReadDOC(docptr, Mplus_LastDataRead);
ofs += size;
got += size;
want -= size;
}
/* Disable flash internally */
WriteDOC(0, docptr, Mplus_FlashSelect);
[MTD] Rework the out of band handling completely Hopefully the last iteration on this! The handling of out of band data on NAND was accompanied by tons of fruitless discussions and halfarsed patches to make it work for a particular problem. Sufficiently annoyed by I all those "I know it better" mails and the resonable amount of discarded "it solves my problem" patches, I finally decided to go for the big rework. After removing the _ecc variants of mtd read/write functions the solution to satisfy the various requirements was to refactor the read/write _oob functions in mtd. The major change is that read/write_oob now takes a pointer to an operation descriptor structure "struct mtd_oob_ops".instead of having a function with at least seven arguments. read/write_oob which should probably renamed to a more descriptive name, can do the following tasks: - read/write out of band data - read/write data content and out of band data - read/write raw data content and out of band data (ecc disabled) struct mtd_oob_ops has a mode field, which determines the oob handling mode. Aside of the MTD_OOB_RAW mode, which is intended to be especially for diagnostic purposes and some internal functions e.g. bad block table creation, the other two modes are for mtd clients: MTD_OOB_PLACE puts/gets the given oob data exactly to/from the place which is described by the ooboffs and ooblen fields of the mtd_oob_ops strcuture. It's up to the caller to make sure that the byte positions are not used by the ECC placement algorithms. MTD_OOB_AUTO puts/gets the given oob data automaticaly to/from the places in the out of band area which are described by the oobfree tuples in the ecclayout data structre which is associated to the devicee. The decision whether data plus oob or oob only handling is done depends on the setting of the datbuf member of the data structure. When datbuf == NULL then the internal read/write_oob functions are selected, otherwise the read/write data routines are invoked. Tested on a few platforms with all variants. Please be aware of possible regressions for your particular device / application scenario Disclaimer: Any whining will be ignored from those who just contributed "hot air blurb" and never sat down to tackle the underlying problem of the mess in the NAND driver grown over time and the big chunk of work to fix up the existing users. The problem was not the holiness of the existing MTD interfaces. The problems was the lack of time to go for the big overhaul. It's easy to add more mess to the existing one, but it takes alot of effort to go for a real solution. Improvements and bugfixes are welcome! Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-29 01:26:58 +00:00
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];
DoC_CheckASIC(docptr);
if (len != mtd->erasesize)
printk(KERN_WARNING "MTD: 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;
/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
WriteDOC(DOC_FLASH_CE, docptr, Mplus_FlashSelect);
DoC_Command(docptr, NAND_CMD_RESET, 0x00);
DoC_WaitReady(docptr);
DoC_Command(docptr, NAND_CMD_ERASE1, 0);
DoC_Address(this, 2, ofs, 0, 0x00);
DoC_Command(docptr, NAND_CMD_ERASE2, 0);
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. */
DoC_Command(docptr, NAND_CMD_STATUS, 0);
dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
if ((dummy = ReadDOC(docptr, Mplus_LastDataRead)) & 1) {
printk("MTD: Error 0x%x erasing at 0x%x\n", dummy, ofs);
/* FIXME: implement Bad Block Replacement (in nftl.c ??) */
instr->state = MTD_ERASE_FAILED;
} else {
instr->state = MTD_ERASE_DONE;
}
dummy = ReadDOC(docptr, Mplus_LastDataRead);
/* Disable flash internally */
WriteDOC(0, docptr, Mplus_FlashSelect);
mtd_erase_callback(instr);
return 0;
}
/****************************************************************************
*
* Module stuff
*
****************************************************************************/
static void __exit cleanup_doc2001plus(void)
{
struct mtd_info *mtd;
struct DiskOnChip *this;
while ((mtd=docmilpluslist)) {
this = mtd->priv;
docmilpluslist = this->nextdoc;
del_mtd_device(mtd);
iounmap(this->virtadr);
kfree(this->chips);
kfree(mtd);
}
}
module_exit(cleanup_doc2001plus);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com> et al.");
MODULE_DESCRIPTION("Driver for DiskOnChip Millennium Plus");