doc2000.c
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- /*
- * Linux driver for Disk-On-Chip 2000 and Millennium
- * (c) 1999 Machine Vision Holdings, Inc.
- * (c) 1999, 2000 David Woodhouse <dwmw2@infradead.org>
- *
- * $Id: doc2000.c,v 1.46 2001/10/02 15:05:13 dwmw2 Exp $
- */
- #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/pci.h>
- #include <linux/delay.h>
- #include <linux/slab.h>
- #include <linux/sched.h>
- #include <linux/init.h>
- #include <linux/types.h>
- #include <linux/mtd/mtd.h>
- #include <linux/mtd/nand.h>
- #include <linux/mtd/nand_ids.h>
- #include <linux/mtd/doc2000.h>
- #define DOC_SUPPORT_2000
- #define DOC_SUPPORT_MILLENNIUM
- #ifdef DOC_SUPPORT_2000
- #define DoC_is_2000(doc) (doc->ChipID == DOC_ChipID_Doc2k)
- #else
- #define DoC_is_2000(doc) (0)
- #endif
- #ifdef DOC_SUPPORT_MILLENNIUM
- #define DoC_is_Millennium(doc) (doc->ChipID == DOC_ChipID_DocMil)
- #else
- #define DoC_is_Millennium(doc) (0)
- #endif
- /* #define ECC_DEBUG */
- /* I have no idea why some DoC chips can not use memcpy_from|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_ecc(struct mtd_info *mtd, loff_t from, size_t len,
- size_t *retlen, u_char *buf, u_char *eccbuf);
- static int doc_write_ecc(struct mtd_info *mtd, loff_t to, size_t len,
- size_t *retlen, const u_char *buf, u_char *eccbuf);
- static int doc_read_oob(struct mtd_info *mtd, loff_t ofs, size_t len,
- size_t *retlen, u_char *buf);
- static int doc_write_oob(struct mtd_info *mtd, loff_t ofs, size_t len,
- size_t *retlen, const u_char *buf);
- static int doc_write_oob_nolock(struct mtd_info *mtd, loff_t ofs, size_t len,
- size_t *retlen, const u_char *buf);
- static int doc_erase (struct mtd_info *mtd, struct erase_info *instr);
- static struct mtd_info *doc2klist = NULL;
- /* Perform the required delay cycles by reading from the appropriate register */
- static void DoC_Delay(struct DiskOnChip *doc, unsigned short cycles)
- {
- volatile char dummy;
- int i;
-
- for (i = 0; i < cycles; i++) {
- if (DoC_is_Millennium(doc))
- dummy = ReadDOC(doc->virtadr, NOP);
- else
- dummy = ReadDOC(doc->virtadr, DOCStatus);
- }
-
- }
- /* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */
- static int _DoC_WaitReady(struct DiskOnChip *doc)
- {
- unsigned long docptr = doc->virtadr;
- unsigned long timeo = jiffies + (HZ * 10);
- DEBUG(MTD_DEBUG_LEVEL3,
- "_DoC_WaitReady called for out-of-line waitn");
- /* Out-of-line routine to wait for chip response */
- while (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) {
- if (time_after(jiffies, timeo)) {
- DEBUG(MTD_DEBUG_LEVEL2, "_DoC_WaitReady timed out.n");
- return -EIO;
- }
- if (current->need_resched) {
- set_current_state(TASK_UNINTERRUPTIBLE);
- schedule_timeout(1);
- }
- else
- udelay(1);
- }
- return 0;
- }
- static inline int DoC_WaitReady(struct DiskOnChip *doc)
- {
- unsigned long docptr = doc->virtadr;
- /* 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(doc, 4);
- if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B))
- /* Call the out-of-line routine to wait */
- ret = _DoC_WaitReady(doc);
- /* issue 2 read from NOP register after reading from CDSNControl register
- see Software Requirement 11.4 item 2. */
- DoC_Delay(doc, 2);
- return ret;
- }
- /* DoC_Command: Send a flash command to the flash chip through the CDSN Slow IO register to
- bypass 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 int DoC_Command(struct DiskOnChip *doc, unsigned char command,
- unsigned char xtraflags)
- {
- unsigned long docptr = doc->virtadr;
- if (DoC_is_2000(doc))
- xtraflags |= CDSN_CTRL_FLASH_IO;
- /* Assert the CLE (Command Latch Enable) line to the flash chip */
- WriteDOC(xtraflags | CDSN_CTRL_CLE | CDSN_CTRL_CE, docptr, CDSNControl);
- DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
- if (DoC_is_Millennium(doc))
- WriteDOC(command, docptr, CDSNSlowIO);
- /* Send the command */
- WriteDOC_(command, docptr, doc->ioreg);
- /* Lower the CLE line */
- WriteDOC(xtraflags | CDSN_CTRL_CE, docptr, CDSNControl);
- DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
- /* Wait for the chip to respond - Software requirement 11.4.1 (extended for any command) */
- return DoC_WaitReady(doc);
- }
- /* DoC_Address: Set the current address for the flash chip through the CDSN Slow IO register to
- bypass 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 int DoC_Address(struct DiskOnChip *doc, int numbytes, unsigned long ofs,
- unsigned char xtraflags1, unsigned char xtraflags2)
- {
- unsigned long docptr;
- int i;
- docptr = doc->virtadr;
- if (DoC_is_2000(doc))
- xtraflags1 |= CDSN_CTRL_FLASH_IO;
- /* Assert the ALE (Address Latch Enable) line to the flash chip */
- WriteDOC(xtraflags1 | CDSN_CTRL_ALE | CDSN_CTRL_CE, docptr, CDSNControl);
- DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
- /* Send the address */
- /* Devices with 256-byte page are addressed as:
- Column (bits 0-7), Page (bits 8-15, 16-23, 24-31)
- * there is no device on the market with page256
- and more than 24 bits.
- Devices with 512-byte page are addressed as:
- Column (bits 0-7), Page (bits 9-16, 17-24, 25-31)
- * 25-31 is sent only if the chip support it.
- * bit 8 changes the read command to be sent
- (NAND_CMD_READ0 or NAND_CMD_READ1).
- */
- if (numbytes == ADDR_COLUMN || numbytes == ADDR_COLUMN_PAGE) {
- if (DoC_is_Millennium(doc))
- WriteDOC(ofs & 0xff, docptr, CDSNSlowIO);
- WriteDOC_(ofs & 0xff, docptr, doc->ioreg);
- }
- if (doc->page256) {
- ofs = ofs >> 8;
- } else {
- ofs = ofs >> 9;
- }
- if (numbytes == ADDR_PAGE || numbytes == ADDR_COLUMN_PAGE) {
- for (i = 0; i < doc->pageadrlen; i++, ofs = ofs >> 8) {
- if (DoC_is_Millennium(doc))
- WriteDOC(ofs & 0xff, docptr, CDSNSlowIO);
- WriteDOC_(ofs & 0xff, docptr, doc->ioreg);
- }
- }
- DoC_Delay(doc, 2); /* Needed for some slow flash chips. mf. */
-
- /* FIXME: The SlowIO's for millennium could be replaced by
- a single WritePipeTerm here. mf. */
- /* Lower the ALE line */
- WriteDOC(xtraflags1 | xtraflags2 | CDSN_CTRL_CE, docptr,
- CDSNControl);
- DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
- /* Wait for the chip to respond - Software requirement 11.4.1 */
- return DoC_WaitReady(doc);
- }
- /* Read a buffer from DoC, taking care of Millennium odditys */
- static void DoC_ReadBuf(struct DiskOnChip *doc, u_char * buf, int len)
- {
- volatile int dummy;
- int modulus = 0xffff;
- unsigned long docptr;
- int i;
- docptr = doc->virtadr;
- if (len <= 0)
- return;
- if (DoC_is_Millennium(doc)) {
- /* Read the data via the internal pipeline through CDSN IO register,
- see Pipelined Read Operations 11.3 */
- dummy = ReadDOC(docptr, ReadPipeInit);
- /* Millennium should use the LastDataRead register - Pipeline Reads */
- len--;
- /* This is needed for correctly ECC calculation */
- modulus = 0xff;
- }
- for (i = 0; i < len; i++)
- buf[i] = ReadDOC_(docptr, doc->ioreg + (i & modulus));
- if (DoC_is_Millennium(doc)) {
- buf[i] = ReadDOC(docptr, LastDataRead);
- }
- }
- /* Write a buffer to DoC, taking care of Millennium odditys */
- static void DoC_WriteBuf(struct DiskOnChip *doc, const u_char * buf, int len)
- {
- unsigned long docptr;
- int i;
- docptr = doc->virtadr;
- if (len <= 0)
- return;
- for (i = 0; i < len; i++)
- WriteDOC_(buf[i], docptr, doc->ioreg + i);
- if (DoC_is_Millennium(doc)) {
- WriteDOC(0x00, docptr, WritePipeTerm);
- }
- }
- /* DoC_SelectChip: Select a given flash chip within the current floor */
- static inline int DoC_SelectChip(struct DiskOnChip *doc, int chip)
- {
- unsigned long docptr = doc->virtadr;
- /* Software requirement 11.4.4 before writing DeviceSelect */
- /* Deassert the CE line to eliminate glitches on the FCE# outputs */
- WriteDOC(CDSN_CTRL_WP, docptr, CDSNControl);
- DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
- /* Select the individual flash chip requested */
- WriteDOC(chip, docptr, CDSNDeviceSelect);
- DoC_Delay(doc, 4);
- /* Reassert the CE line */
- WriteDOC(CDSN_CTRL_CE | CDSN_CTRL_FLASH_IO | CDSN_CTRL_WP, docptr,
- CDSNControl);
- DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
- /* Wait for it to be ready */
- return DoC_WaitReady(doc);
- }
- /* DoC_SelectFloor: Select a given floor (bank of flash chips) */
- static inline int DoC_SelectFloor(struct DiskOnChip *doc, int floor)
- {
- unsigned long docptr = doc->virtadr;
- /* Select the floor (bank) of chips required */
- WriteDOC(floor, docptr, FloorSelect);
- /* Wait for the chip to be ready */
- return DoC_WaitReady(doc);
- }
- /* 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;
- volatile char dummy;
- /* Page in the required floor/chip */
- DoC_SelectFloor(doc, floor);
- DoC_SelectChip(doc, chip);
- /* Reset the chip */
- if (DoC_Command(doc, NAND_CMD_RESET, CDSN_CTRL_WP)) {
- DEBUG(MTD_DEBUG_LEVEL2,
- "DoC_Command (reset) for %d,%d returned truen",
- floor, chip);
- return 0;
- }
- /* Read the NAND chip ID: 1. Send ReadID command */
- if (DoC_Command(doc, NAND_CMD_READID, CDSN_CTRL_WP)) {
- DEBUG(MTD_DEBUG_LEVEL2,
- "DoC_Command (ReadID) for %d,%d returned truen",
- floor, chip);
- return 0;
- }
- /* Read the NAND chip ID: 2. Send address byte zero */
- DoC_Address(doc, ADDR_COLUMN, 0, CDSN_CTRL_WP, 0);
- /* Read the manufacturer and device id codes from the device */
- /* CDSN Slow IO register see Software Requirement 11.4 item 5. */
- dummy = ReadDOC(doc->virtadr, CDSNSlowIO);
- DoC_Delay(doc, 2);
- mfr = ReadDOC_(doc->virtadr, doc->ioreg);
- /* CDSN Slow IO register see Software Requirement 11.4 item 5. */
- dummy = ReadDOC(doc->virtadr, CDSNSlowIO);
- DoC_Delay(doc, 2);
- id = ReadDOC_(doc->virtadr, doc->ioreg);
- /* No response - return failure */
- if (mfr == 0xff || mfr == 0)
- return 0;
- /* Check it's the same as the first chip we identified.
- * M-Systems say that any given DiskOnChip device should only
- * contain _one_ type of flash part, although that's not a
- * hardware restriction. */
- if (doc->mfr) {
- if (doc->mfr == mfr && doc->id == id)
- return 1; /* This is another the same the first */
- else
- printk(KERN_WARNING
- "Flash chip at floor %d, chip %d is different:n",
- floor, chip);
- }
- /* Print and store the manufacturer and ID codes. */
- for (i = 0; nand_flash_ids[i].name != NULL; i++) {
- if (mfr == nand_flash_ids[i].manufacture_id &&
- id == nand_flash_ids[i].model_id) {
- printk(KERN_INFO
- "Flash chip found: Manufacturer ID: %2.2X, "
- "Chip ID: %2.2X (%s)n", mfr, id,
- nand_flash_ids[i].name);
- if (!doc->mfr) {
- doc->mfr = mfr;
- doc->id = id;
- doc->chipshift =
- nand_flash_ids[i].chipshift;
- doc->page256 = nand_flash_ids[i].page256;
- doc->pageadrlen =
- nand_flash_ids[i].pageadrlen;
- doc->erasesize =
- nand_flash_ids[i].erasesize;
- return 1;
- }
- return 0;
- }
- }
- /* We haven't fully identified the chip. Print as much as we know. */
- printk(KERN_WARNING "Unknown flash chip found: %2.2X %2.2Xn",
- id, mfr);
- printk(KERN_WARNING "Please report to dwmw2@infradead.orgn");
- return 0;
- }
- /* 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];
- int maxchips = MAX_CHIPS;
- int ret = 1;
- this->numchips = 0;
- this->mfr = 0;
- this->id = 0;
- if (DoC_is_Millennium(this))
- maxchips = MAX_CHIPS_MIL;
- /* For each floor, find the number of valid chips it contains */
- for (floor = 0; floor < MAX_FLOORS; floor++) {
- ret = 1;
- numchips[floor] = 0;
- for (chip = 0; chip < maxchips && 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(KERN_NOTICE "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(KERN_NOTICE "No memory for allocating chip info structuresn");
- return;
- }
- ret = 0;
- /* Fill out the chip array with {floor, chipno} for each
- * detected chip in the device. */
- for (floor = 0; floor < MAX_FLOORS; 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 MiBn",
- this->numchips, this->totlen >> 20);
- }
- static int DoC2k_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, 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;
- }
- static const char im_name[] = "DoC2k_init";
- /* This routine is made available to other mtd code via
- * inter_module_register. It must only be accessed through
- * inter_module_get which will bump the use count of this module. The
- * addresses passed back in mtd are valid as long as the use count of
- * this module is non-zero, i.e. between inter_module_get and
- * inter_module_put. Keith Owens <kaos@ocs.com.au> 29 Oct 2000.
- */
- static void DoC2k_init(struct mtd_info *mtd)
- {
- struct DiskOnChip *this = (struct DiskOnChip *) mtd->priv;
- struct DiskOnChip *old = NULL;
- /* We must avoid being called twice for the same device. */
- if (doc2klist)
- old = (struct DiskOnChip *) doc2klist->priv;
- while (old) {
- if (DoC2k_is_alias(old, this)) {
- printk(KERN_NOTICE
- "Ignoring DiskOnChip 2000 at 0x%lX - already configuredn",
- this->physadr);
- iounmap((void *) this->virtadr);
- kfree(mtd);
- return;
- }
- if (old->nextdoc)
- old = (struct DiskOnChip *) old->nextdoc->priv;
- else
- old = NULL;
- }
- switch (this->ChipID) {
- case DOC_ChipID_Doc2k:
- mtd->name = "DiskOnChip 2000";
- this->ioreg = DoC_2k_CDSN_IO;
- break;
- case DOC_ChipID_DocMil:
- mtd->name = "DiskOnChip Millennium";
- this->ioreg = DoC_Mil_CDSN_IO;
- break;
- }
- printk(KERN_NOTICE "%s found at address 0x%lXn", mtd->name,
- this->physadr);
- mtd->type = MTD_NANDFLASH;
- mtd->flags = MTD_CAP_NANDFLASH;
- mtd->size = 0;
- mtd->erasesize = 0;
- mtd->oobblock = 512;
- mtd->oobsize = 16;
- mtd->module = THIS_MODULE;
- mtd->erase = doc_erase;
- mtd->point = NULL;
- mtd->unpoint = NULL;
- mtd->read = doc_read;
- mtd->write = doc_write;
- mtd->read_ecc = doc_read_ecc;
- mtd->write_ecc = doc_write_ecc;
- 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;
- init_MUTEX(&this->lock);
- /* Ident all the chips present. */
- DoC_ScanChips(this);
- if (!this->totlen) {
- kfree(mtd);
- iounmap((void *) this->virtadr);
- } else {
- this->nextdoc = doc2klist;
- doc2klist = mtd;
- mtd->size = this->totlen;
- mtd->erasesize = this->erasesize;
- add_mtd_device(mtd);
- return;
- }
- }
- static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
- size_t * retlen, u_char * buf)
- {
- /* Just a special case of doc_read_ecc */
- return doc_read_ecc(mtd, from, len, retlen, buf, NULL);
- }
- static int doc_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,
- size_t * retlen, u_char * buf, u_char * eccbuf)
- {
- struct DiskOnChip *this = (struct DiskOnChip *) mtd->priv;
- unsigned long docptr;
- struct Nand *mychip;
- unsigned char syndrome[6];
- volatile char dummy;
- int i, len256 = 0, ret=0;
- docptr = this->virtadr;
- /* Don't allow read past end of device */
- if (from >= this->totlen)
- return -EINVAL;
- down(&this->lock);
- /* Don't allow a single read to cross a 512-byte block boundary */
- if (from + len > ((from | 0x1ff) + 1))
- len = ((from | 0x1ff) + 1) - from;
- /* The ECC will not be calculated correctly if less than 512 is read */
- if (len != 0x200 && eccbuf)
- printk(KERN_WARNING
- "ECC needs a full sector read (adr: %lx size %lx)n",
- (long) from, (long) len);
- /* printk("DoC_Read (adr: %lx size %lx)n", (long) from, (long) len); */
- /* Find the chip which is to be used and select it */
- mychip = &this->chips[from >> (this->chipshift)];
- if (this->curfloor != mychip->floor) {
- DoC_SelectFloor(this, mychip->floor);
- DoC_SelectChip(this, mychip->chip);
- } else if (this->curchip != mychip->chip) {
- DoC_SelectChip(this, mychip->chip);
- }
- this->curfloor = mychip->floor;
- this->curchip = mychip->chip;
- DoC_Command(this,
- (!this->page256
- && (from & 0x100)) ? NAND_CMD_READ1 : NAND_CMD_READ0,
- CDSN_CTRL_WP);
- DoC_Address(this, ADDR_COLUMN_PAGE, from, CDSN_CTRL_WP,
- CDSN_CTRL_ECC_IO);
- if (eccbuf) {
- /* Prime the ECC engine */
- WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
- WriteDOC(DOC_ECC_EN, docptr, ECCConf);
- } else {
- /* disable the ECC engine */
- WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
- WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
- }
- /* treat crossing 256-byte sector for 2M x 8bits devices */
- if (this->page256 && from + len > (from | 0xff) + 1) {
- len256 = (from | 0xff) + 1 - from;
- DoC_ReadBuf(this, buf, len256);
- DoC_Command(this, NAND_CMD_READ0, CDSN_CTRL_WP);
- DoC_Address(this, ADDR_COLUMN_PAGE, from + len256,
- CDSN_CTRL_WP, CDSN_CTRL_ECC_IO);
- }
- DoC_ReadBuf(this, &buf[len256], len - len256);
- /* Let the caller know we completed it */
- *retlen = len;
- if (eccbuf) {
- /* Read the ECC data through the DiskOnChip ECC logic */
- /* Note: this will work even with 2M x 8bit devices as */
- /* they have 8 bytes of OOB per 256 page. mf. */
- DoC_ReadBuf(this, eccbuf, 6);
- /* Flush the pipeline */
- if (DoC_is_Millennium(this)) {
- dummy = ReadDOC(docptr, ECCConf);
- dummy = ReadDOC(docptr, ECCConf);
- i = ReadDOC(docptr, ECCConf);
- } else {
- dummy = ReadDOC(docptr, 2k_ECCStatus);
- dummy = ReadDOC(docptr, 2k_ECCStatus);
- i = ReadDOC(docptr, 2k_ECCStatus);
- }
- /* Check the ECC Status */
- if (i & 0x80) {
- int nb_errors;
- /* There was an ECC error */
- #ifdef ECC_DEBUG
- printk(KERN_ERR "DiskOnChip ECC Error: Read at %lxn", (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, ECCSyndrome0 + i);
- }
- nb_errors = doc_decode_ecc(buf, syndrome);
- #ifdef ECC_DEBUG
- printk(KERN_ERR "Errors corrected: %xn", 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(KERN_DEBUG "ECC DATA at %lxB: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2Xn",
- (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);
- }
- /* according to 11.4.1, we need to wait for the busy line
- * drop if we read to the end of the page. */
- if(0 == ((from + *retlen) & 0x1ff))
- {
- DoC_WaitReady(this);
- }
- up(&this->lock);
- return ret;
- }
- static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
- size_t * retlen, const u_char * buf)
- {
- char eccbuf[6];
- return doc_write_ecc(mtd, to, len, retlen, buf, eccbuf);
- }
- static int doc_write_ecc(struct mtd_info *mtd, loff_t to, size_t len,
- size_t * retlen, const u_char * buf,
- u_char * eccbuf)
- {
- struct DiskOnChip *this = (struct DiskOnChip *) mtd->priv;
- int di; /* Yes, DI is a hangover from when I was disassembling the binary driver */
- unsigned long docptr;
- volatile char dummy;
- int len256 = 0;
- struct Nand *mychip;
- docptr = this->virtadr;
- /* Don't allow write past end of device */
- if (to >= this->totlen)
- return -EINVAL;
- down(&this->lock);
- /* Don't allow a single write to cross a 512-byte block boundary */
- if (to + len > ((to | 0x1ff) + 1))
- len = ((to | 0x1ff) + 1) - to;
- /* The ECC will not be calculated correctly if less than 512 is written */
- if (len != 0x200 && eccbuf)
- printk(KERN_WARNING
- "ECC needs a full sector write (adr: %lx size %lx)n",
- (long) to, (long) len);
- /* printk("DoC_Write (adr: %lx size %lx)n", (long) to, (long) len); */
- /* Find the chip which is to be used and select it */
- mychip = &this->chips[to >> (this->chipshift)];
- if (this->curfloor != mychip->floor) {
- DoC_SelectFloor(this, mychip->floor);
- DoC_SelectChip(this, mychip->chip);
- } else if (this->curchip != mychip->chip) {
- DoC_SelectChip(this, mychip->chip);
- }
- this->curfloor = mychip->floor;
- this->curchip = mychip->chip;
- /* Set device to main plane of flash */
- DoC_Command(this, NAND_CMD_RESET, CDSN_CTRL_WP);
- DoC_Command(this,
- (!this->page256
- && (to & 0x100)) ? NAND_CMD_READ1 : NAND_CMD_READ0,
- CDSN_CTRL_WP);
- DoC_Command(this, NAND_CMD_SEQIN, 0);
- DoC_Address(this, ADDR_COLUMN_PAGE, to, 0, CDSN_CTRL_ECC_IO);
- if (eccbuf) {
- /* Prime the ECC engine */
- WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
- WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf);
- } else {
- /* disable the ECC engine */
- WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
- WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
- }
- /* treat crossing 256-byte sector for 2M x 8bits devices */
- if (this->page256 && to + len > (to | 0xff) + 1) {
- len256 = (to | 0xff) + 1 - to;
- DoC_WriteBuf(this, buf, len256);
- DoC_Command(this, NAND_CMD_PAGEPROG, 0);
- DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP);
- /* There's an implicit DoC_WaitReady() in DoC_Command */
- dummy = ReadDOC(docptr, CDSNSlowIO);
- DoC_Delay(this, 2);
- if (ReadDOC_(docptr, this->ioreg) & 1) {
- printk(KERN_ERR "Error programming flashn");
- /* Error in programming */
- *retlen = 0;
- up(&this->lock);
- return -EIO;
- }
- DoC_Command(this, NAND_CMD_SEQIN, 0);
- DoC_Address(this, ADDR_COLUMN_PAGE, to + len256, 0,
- CDSN_CTRL_ECC_IO);
- }
- DoC_WriteBuf(this, &buf[len256], len - len256);
- if (eccbuf) {
- WriteDOC(CDSN_CTRL_ECC_IO | CDSN_CTRL_CE, docptr,
- CDSNControl);
- if (DoC_is_Millennium(this)) {
- WriteDOC(0, docptr, NOP);
- WriteDOC(0, docptr, NOP);
- WriteDOC(0, docptr, NOP);
- } else {
- WriteDOC_(0, docptr, this->ioreg);
- WriteDOC_(0, docptr, this->ioreg);
- WriteDOC_(0, docptr, this->ioreg);
- }
- /* Read the ECC data through the DiskOnChip ECC logic */
- for (di = 0; di < 6; di++) {
- eccbuf[di] = ReadDOC(docptr, ECCSyndrome0 + di);
- }
- /* Reset the ECC engine */
- WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
- #ifdef PSYCHO_DEBUG
- printk
- ("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2Xn",
- (long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
- eccbuf[4], eccbuf[5]);
- #endif
- }
- DoC_Command(this, NAND_CMD_PAGEPROG, 0);
- DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP);
- /* There's an implicit DoC_WaitReady() in DoC_Command */
- dummy = ReadDOC(docptr, CDSNSlowIO);
- DoC_Delay(this, 2);
- if (ReadDOC_(docptr, this->ioreg) & 1) {
- printk(KERN_ERR "Error programming flashn");
- /* Error in programming */
- *retlen = 0;
- up(&this->lock);
- return -EIO;
- }
- /* Let the caller know we completed it */
- *retlen = len;
-
- if (eccbuf) {
- unsigned char x[8];
- size_t dummy;
- int ret;
- /* Write the ECC data to flash */
- for (di=0; di<6; di++)
- x[di] = eccbuf[di];
-
- x[6]=0x55;
- x[7]=0x55;
-
- ret = doc_write_oob_nolock(mtd, to, 8, &dummy, x);
- up(&this->lock);
- return ret;
- }
- up(&this->lock);
- return 0;
- }
- static int doc_read_oob(struct mtd_info *mtd, loff_t ofs, size_t len,
- size_t * retlen, u_char * buf)
- {
- struct DiskOnChip *this = (struct DiskOnChip *) mtd->priv;
- int len256 = 0, ret;
- unsigned long docptr;
- struct Nand *mychip;
- down(&this->lock);
- docptr = this->virtadr;
- mychip = &this->chips[ofs >> this->chipshift];
- if (this->curfloor != mychip->floor) {
- DoC_SelectFloor(this, mychip->floor);
- DoC_SelectChip(this, mychip->chip);
- } else if (this->curchip != mychip->chip) {
- DoC_SelectChip(this, mychip->chip);
- }
- this->curfloor = mychip->floor;
- this->curchip = mychip->chip;
- /* update address for 2M x 8bit devices. OOB starts on the second */
- /* page to maintain compatibility with doc_read_ecc. */
- if (this->page256) {
- if (!(ofs & 0x8))
- ofs += 0x100;
- else
- ofs -= 0x8;
- }
- DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP);
- DoC_Address(this, ADDR_COLUMN_PAGE, ofs, CDSN_CTRL_WP, 0);
- /* treat crossing 8-byte OOB data for 2M x 8bit devices */
- /* Note: datasheet says it should automaticaly wrap to the */
- /* next OOB block, but it didn't work here. mf. */
- if (this->page256 && ofs + len > (ofs | 0x7) + 1) {
- len256 = (ofs | 0x7) + 1 - ofs;
- DoC_ReadBuf(this, buf, len256);
- DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP);
- DoC_Address(this, ADDR_COLUMN_PAGE, ofs & (~0x1ff),
- CDSN_CTRL_WP, 0);
- }
- DoC_ReadBuf(this, &buf[len256], len - len256);
- *retlen = len;
- /* Reading the full OOB data drops us off of the end of the page,
- * causing the flash device to go into busy mode, so we need
- * to wait until ready 11.4.1 and Toshiba TC58256FT docs */
-
- ret = DoC_WaitReady(this);
- up(&this->lock);
- return ret;
- }
- static int doc_write_oob_nolock(struct mtd_info *mtd, loff_t ofs, size_t len,
- size_t * retlen, const u_char * buf)
- {
- struct DiskOnChip *this = (struct DiskOnChip *) mtd->priv;
- int len256 = 0;
- unsigned long docptr = this->virtadr;
- struct Nand *mychip = &this->chips[ofs >> this->chipshift];
- volatile int dummy;
- // printk("doc_write_oob(%lx, %d): %2.2X %2.2X %2.2X %2.2X ... %2.2X %2.2X .. %2.2X %2.2Xn",(long)ofs, len,
- // buf[0], buf[1], buf[2], buf[3], buf[8], buf[9], buf[14],buf[15]);
- /* Find the chip which is to be used and select it */
- if (this->curfloor != mychip->floor) {
- DoC_SelectFloor(this, mychip->floor);
- DoC_SelectChip(this, mychip->chip);
- } else if (this->curchip != mychip->chip) {
- DoC_SelectChip(this, 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(this, NAND_CMD_RESET, CDSN_CTRL_WP);
- /* issue the Read2 command to set the pointer to the Spare Data Area. */
- DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP);
- /* update address for 2M x 8bit devices. OOB starts on the second */
- /* page to maintain compatibility with doc_read_ecc. */
- if (this->page256) {
- if (!(ofs & 0x8))
- ofs += 0x100;
- else
- ofs -= 0x8;
- }
- /* issue the Serial Data In command to initial the Page Program process */
- DoC_Command(this, NAND_CMD_SEQIN, 0);
- DoC_Address(this, ADDR_COLUMN_PAGE, ofs, 0, 0);
- /* treat crossing 8-byte OOB data for 2M x 8bit devices */
- /* Note: datasheet says it should automaticaly wrap to the */
- /* next OOB block, but it didn't work here. mf. */
- if (this->page256 && ofs + len > (ofs | 0x7) + 1) {
- len256 = (ofs | 0x7) + 1 - ofs;
- DoC_WriteBuf(this, buf, len256);
- DoC_Command(this, NAND_CMD_PAGEPROG, 0);
- DoC_Command(this, NAND_CMD_STATUS, 0);
- /* DoC_WaitReady() is implicit in DoC_Command */
- dummy = ReadDOC(docptr, CDSNSlowIO);
- DoC_Delay(this, 2);
- if (ReadDOC_(docptr, this->ioreg) & 1) {
- printk(KERN_ERR "Error programming oob datan");
- /* There was an error */
- *retlen = 0;
- return -EIO;
- }
- DoC_Command(this, NAND_CMD_SEQIN, 0);
- DoC_Address(this, ADDR_COLUMN_PAGE, ofs & (~0x1ff), 0, 0);
- }
- DoC_WriteBuf(this, &buf[len256], len - len256);
- DoC_Command(this, NAND_CMD_PAGEPROG, 0);
- DoC_Command(this, NAND_CMD_STATUS, 0);
- /* DoC_WaitReady() is implicit in DoC_Command */
- dummy = ReadDOC(docptr, CDSNSlowIO);
- DoC_Delay(this, 2);
- if (ReadDOC_(docptr, this->ioreg) & 1) {
- printk(KERN_ERR "Error programming oob datan");
- /* There was an error */
- *retlen = 0;
- return -EIO;
- }
- *retlen = len;
- return 0;
- }
-
- static int doc_write_oob(struct mtd_info *mtd, loff_t ofs, size_t len,
- size_t * retlen, const u_char * buf)
- {
- struct DiskOnChip *this = (struct DiskOnChip *) mtd->priv;
- int ret;
- down(&this->lock);
- ret = doc_write_oob_nolock(mtd, ofs, len, retlen, buf);
- up(&this->lock);
- return ret;
- }
- static int doc_erase(struct mtd_info *mtd, struct erase_info *instr)
- {
- struct DiskOnChip *this = (struct DiskOnChip *) mtd->priv;
- __u32 ofs = instr->addr;
- __u32 len = instr->len;
- volatile int dummy;
- unsigned long docptr;
- struct Nand *mychip;
- down(&this->lock);
- if (ofs & (mtd->erasesize-1) || len & (mtd->erasesize-1)) {
- up(&this->lock);
- return -EINVAL;
- }
- instr->state = MTD_ERASING;
-
- docptr = this->virtadr;
- /* FIXME: Do this in the background. Use timers or schedule_task() */
- while(len) {
- mychip = &this->chips[ofs >> this->chipshift];
- if (this->curfloor != mychip->floor) {
- DoC_SelectFloor(this, mychip->floor);
- DoC_SelectChip(this, mychip->chip);
- } else if (this->curchip != mychip->chip) {
- DoC_SelectChip(this, mychip->chip);
- }
- this->curfloor = mychip->floor;
- this->curchip = mychip->chip;
- DoC_Command(this, NAND_CMD_ERASE1, 0);
- DoC_Address(this, ADDR_PAGE, ofs, 0, 0);
- DoC_Command(this, NAND_CMD_ERASE2, 0);
- DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP);
- dummy = ReadDOC(docptr, CDSNSlowIO);
- DoC_Delay(this, 2);
-
- if (ReadDOC_(docptr, this->ioreg) & 1) {
- printk(KERN_ERR "Error erasing at 0x%xn", ofs);
- /* There was an error */
- instr->state = MTD_ERASE_FAILED;
- goto callback;
- }
- ofs += mtd->erasesize;
- len -= mtd->erasesize;
- }
- instr->state = MTD_ERASE_DONE;
- callback:
- if (instr->callback)
- instr->callback(instr);
- up(&this->lock);
- return 0;
- }
- /****************************************************************************
- *
- * Module stuff
- *
- ****************************************************************************/
- int __init init_doc2000(void)
- {
- inter_module_register(im_name, THIS_MODULE, &DoC2k_init);
- return 0;
- }
- static void __exit cleanup_doc2000(void)
- {
- struct mtd_info *mtd;
- struct DiskOnChip *this;
- while ((mtd = doc2klist)) {
- this = (struct DiskOnChip *) mtd->priv;
- doc2klist = this->nextdoc;
- del_mtd_device(mtd);
- iounmap((void *) this->virtadr);
- kfree(this->chips);
- kfree(mtd);
- }
- inter_module_unregister(im_name);
- }
- module_exit(cleanup_doc2000);
- module_init(init_doc2000);
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al.");
- MODULE_DESCRIPTION("MTD driver for DiskOnChip 2000 and Millennium");