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