diff options
Diffstat (limited to 'drivers/mtd/devices/doc2001.c')
| -rw-r--r-- | drivers/mtd/devices/doc2001.c | 888 |
1 files changed, 888 insertions, 0 deletions
diff --git a/drivers/mtd/devices/doc2001.c b/drivers/mtd/devices/doc2001.c new file mode 100644 index 00000000000..1e704915ef0 --- /dev/null +++ b/drivers/mtd/devices/doc2001.c @@ -0,0 +1,888 @@ + +/* + * Linux driver for Disk-On-Chip Millennium + * (c) 1999 Machine Vision Holdings, Inc. + * (c) 1999, 2000 David Woodhouse <dwmw2@infradead.org> + * + * $Id: doc2001.c,v 1.48 2005/01/05 18:05:12 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/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_ecc(struct mtd_info *mtd, loff_t from, size_t len, + size_t *retlen, u_char *buf, u_char *eccbuf, + struct nand_oobinfo *oobsel); +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 nand_oobinfo *oobsel); +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_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; + + 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, CDSNControl) & CDSN_CTRL_FR_B) && --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; + + /* 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 inline 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; +} + +static const char im_name[] = "DoCMil_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 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->ecctype = MTD_ECC_RS_DiskOnChip; + mtd->size = 0; + + /* FIXME: erase size is not always 8KiB */ + mtd->erasesize = 0x2000; + + mtd->oobblock = 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_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; + + /* 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; + 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, 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 nand_oobinfo *oobsel) +{ + int i, ret; + volatile char dummy; + unsigned char syndrome[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); + + if (eccbuf) { + /* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/ + 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); + } + + /* 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; + + if (eccbuf) { + /* 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 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("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) +{ + char eccbuf[6]; + return doc_write_ecc(mtd, to, len, retlen, buf, eccbuf, NULL); +} + +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 nand_oobinfo *oobsel) +{ + int i,ret = 0; + 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); + + if (eccbuf) { + /* 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); + } else { + /* disable the ECC engine */ + WriteDOC (DOC_ECC_RESET, docptr, ECCConf); + WriteDOC (DOC_ECC_DIS, 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); + + if (eccbuf) { + /* 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, size_t len, + size_t *retlen, u_char *buf) +{ +#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]; + + /* 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); + + *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) +{ +#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]; + + /* 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 ??) */ + *retlen = 0; + ret = -EIO; + } + dummy = ReadDOC(docptr, LastDataRead); + + *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 int __init init_doc2001(void) +{ + inter_module_register(im_name, THIS_MODULE, &DoCMil_init); + return 0; +} + +static void __exit cleanup_doc2001(void) +{ + struct mtd_info *mtd; + struct DiskOnChip *this; + + while ((mtd=docmillist)) { + this = mtd->priv; + docmillist = this->nextdoc; + + del_mtd_device(mtd); + + iounmap(this->virtadr); + kfree(this->chips); + kfree(mtd); + } + inter_module_unregister(im_name); +} + +module_exit(cleanup_doc2001); +module_init(init_doc2001); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al."); +MODULE_DESCRIPTION("Alternative driver for DiskOnChip Millennium"); |