/* * 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> * * 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/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 *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 (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; } 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; 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); ops->retlen = len; return 0; } 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; 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 */ ops->retlen = 0; ret = -EIO; } dummy = ReadDOC(docptr, Mplus_LastDataRead); ofs += size; got += size; want -= size; } /* Disable flash internally */ WriteDOC(0, docptr, Mplus_FlashSelect); 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");