comment "Disk-On-Chip Device Drivers"
-config MTD_DOC2000
- tristate "M-Systems Disk-On-Chip 2000 and Millennium (DEPRECATED)"
- depends on MTD_NAND
- select MTD_DOCPROBE
- select MTD_NAND_IDS
- ---help---
- This provides an MTD device driver for the M-Systems DiskOnChip
- 2000 and Millennium devices. Originally designed for the DiskOnChip
- 2000, it also now includes support for the DiskOnChip Millennium.
- If you have problems with this driver and the DiskOnChip Millennium,
- you may wish to try the alternative Millennium driver below. To use
- the alternative driver, you will need to undefine DOC_SINGLE_DRIVER
- in the <file:drivers/mtd/devices/docprobe.c> source code.
-
- If you use this device, you probably also want to enable the NFTL
- 'NAND Flash Translation Layer' option below, which is used to
- emulate a block device by using a kind of file system on the flash
- chips.
-
- NOTE: This driver is deprecated and will probably be removed soon.
- Please try the new DiskOnChip driver under "NAND Flash Device
- Drivers".
-
-config MTD_DOC2001
- tristate "M-Systems Disk-On-Chip Millennium-only alternative driver (DEPRECATED)"
- depends on MTD_NAND
- select MTD_DOCPROBE
- select MTD_NAND_IDS
- ---help---
- This provides an alternative MTD device driver for the M-Systems
- DiskOnChip Millennium devices. Use this if you have problems with
- the combined DiskOnChip 2000 and Millennium driver above. To get
- the DiskOnChip probe code to load and use this driver instead of
- the other one, you will need to undefine DOC_SINGLE_DRIVER near
- the beginning of <file:drivers/mtd/devices/docprobe.c>.
-
- If you use this device, you probably also want to enable the NFTL
- 'NAND Flash Translation Layer' option below, which is used to
- emulate a block device by using a kind of file system on the flash
- chips.
-
- NOTE: This driver is deprecated and will probably be removed soon.
- Please try the new DiskOnChip driver under "NAND Flash Device
- Drivers".
-
-config MTD_DOC2001PLUS
- tristate "M-Systems Disk-On-Chip Millennium Plus"
- depends on MTD_NAND
- select MTD_DOCPROBE
- select MTD_NAND_IDS
- ---help---
- This provides an MTD device driver for the M-Systems DiskOnChip
- Millennium Plus devices.
-
- If you use this device, you probably also want to enable the INFTL
- 'Inverse NAND Flash Translation Layer' option below, which is used
- to emulate a block device by using a kind of file system on the
- flash chips.
-
- NOTE: This driver will soon be replaced by the new DiskOnChip driver
- under "NAND Flash Device Drivers" (currently that driver does not
- support all Millennium Plus devices).
-
config MTD_DOCG3
tristate "M-Systems Disk-On-Chip G3"
select BCH
# linux/drivers/mtd/devices/Makefile
#
-obj-$(CONFIG_MTD_DOC2000) += doc2000.o
-obj-$(CONFIG_MTD_DOC2001) += doc2001.o
-obj-$(CONFIG_MTD_DOC2001PLUS) += doc2001plus.o
obj-$(CONFIG_MTD_DOCG3) += docg3.o
-obj-$(CONFIG_MTD_DOCPROBE) += docprobe.o
-obj-$(CONFIG_MTD_DOCECC) += docecc.o
obj-$(CONFIG_MTD_SLRAM) += slram.o
obj-$(CONFIG_MTD_PHRAM) += phram.o
obj-$(CONFIG_MTD_PMC551) += pmc551.o
+++ /dev/null
-
-/*
- * Linux driver for Disk-On-Chip 2000 and 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/sched.h>
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/bitops.h>
-#include <linux/mutex.h>
-
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/nand.h>
-#include <linux/mtd/doc2000.h>
-
-#define DOC_SUPPORT_2000
-#define DOC_SUPPORT_2000TSOP
-#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
-
-#if defined(DOC_SUPPORT_2000TSOP) || defined(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_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_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)
-{
- void __iomem *docptr = doc->virtadr;
- unsigned long timeo = jiffies + (HZ * 10);
-
- 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)) {
- /* issue 2 read from NOP register after reading from CDSNControl register
- see Software Requirement 11.4 item 2. */
- DoC_Delay(doc, 2);
-
- if (time_after(jiffies, timeo)) {
- pr_debug("_DoC_WaitReady timed out.\n");
- return -EIO;
- }
- udelay(1);
- cond_resched();
- }
-
- return 0;
-}
-
-static inline int DoC_WaitReady(struct DiskOnChip *doc)
-{
- void __iomem *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 int DoC_Command(struct DiskOnChip *doc, unsigned char command,
- unsigned char xtraflags)
-{
- void __iomem *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);
- if (DoC_is_Millennium(doc))
- WriteDOC(command, docptr, WritePipeTerm);
-
- /* 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)
-{
- int i;
- void __iomem *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);
- }
- }
-
- if (DoC_is_Millennium(doc))
- WriteDOC(ofs & 0xff, docptr, WritePipeTerm);
-
- 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;
- void __iomem *docptr = doc->virtadr;
- int i;
-
- 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)
-{
- void __iomem *docptr = doc->virtadr;
- int i;
-
- 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)
-{
- void __iomem *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)
-{
- void __iomem *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, j;
- 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)) {
- pr_debug("DoC_Command (reset) for %d,%d returned true\n",
- floor, chip);
- return 0;
- }
-
-
- /* Read the NAND chip ID: 1. Send ReadID command */
- if (DoC_Command(doc, NAND_CMD_READID, CDSN_CTRL_WP)) {
- pr_debug("DoC_Command (ReadID) for %d,%d returned true\n",
- 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 */
-
- if (DoC_is_Millennium(doc)) {
- DoC_Delay(doc, 2);
- dummy = ReadDOC(doc->virtadr, ReadPipeInit);
- mfr = ReadDOC(doc->virtadr, LastDataRead);
-
- DoC_Delay(doc, 2);
- dummy = ReadDOC(doc->virtadr, ReadPipeInit);
- id = ReadDOC(doc->virtadr, LastDataRead);
- } else {
- /* CDSN Slow IO register see Software Req 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 Req 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 the same as 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 (id == nand_flash_ids[i].dev_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);
- if (!doc->mfr) {
- doc->mfr = mfr;
- doc->id = id;
- doc->chipshift =
- ffs((nand_flash_ids[i].chipsize << 20)) - 1;
- doc->page256 = (nand_flash_ids[i].pagesize == 256) ? 1 : 0;
- doc->pageadrlen = doc->chipshift > 25 ? 3 : 2;
- 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 %2.2X\n",
- id, mfr);
-
- printk(KERN_WARNING "Please report to dwmw2@infradead.org\n");
- return 0;
-}
-
-/* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */
-
-static void DoC_ScanChips(struct DiskOnChip *this, int maxchips)
-{
- int floor, chip;
- int numchips[MAX_FLOORS];
- int ret = 1;
-
- this->numchips = 0;
- this->mfr = 0;
- this->id = 0;
-
- /* 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 structures\n");
- 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 MiB\n",
- 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;
-}
-
-/* This routine is found from the docprobe code by symbol_get(),
- * which will bump the use count of this module. */
-void DoC2k_init(struct mtd_info *mtd)
-{
- struct DiskOnChip *this = mtd->priv;
- struct DiskOnChip *old = NULL;
- int maxchips;
-
- /* We must avoid being called twice for the same device. */
-
- if (doc2klist)
- old = doc2klist->priv;
-
- while (old) {
- if (DoC2k_is_alias(old, this)) {
- printk(KERN_NOTICE
- "Ignoring DiskOnChip 2000 at 0x%lX - already configured\n",
- this->physadr);
- iounmap(this->virtadr);
- kfree(mtd);
- return;
- }
- if (old->nextdoc)
- old = old->nextdoc->priv;
- else
- old = NULL;
- }
-
-
- switch (this->ChipID) {
- case DOC_ChipID_Doc2kTSOP:
- mtd->name = "DiskOnChip 2000 TSOP";
- this->ioreg = DoC_Mil_CDSN_IO;
- /* Pretend it's a Millennium */
- this->ChipID = DOC_ChipID_DocMil;
- maxchips = MAX_CHIPS;
- break;
- case DOC_ChipID_Doc2k:
- mtd->name = "DiskOnChip 2000";
- this->ioreg = DoC_2k_CDSN_IO;
- maxchips = MAX_CHIPS;
- break;
- case DOC_ChipID_DocMil:
- mtd->name = "DiskOnChip Millennium";
- this->ioreg = DoC_Mil_CDSN_IO;
- maxchips = MAX_CHIPS_MIL;
- break;
- default:
- printk("Unknown ChipID 0x%02x\n", this->ChipID);
- kfree(mtd);
- iounmap(this->virtadr);
- return;
- }
-
- printk(KERN_NOTICE "%s found at address 0x%lX\n", mtd->name,
- this->physadr);
-
- mtd->type = MTD_NANDFLASH;
- mtd->flags = MTD_CAP_NANDFLASH;
- mtd->writebufsize = mtd->writesize = 512;
- mtd->oobsize = 16;
- mtd->ecc_strength = 2;
- mtd->owner = THIS_MODULE;
- mtd->_erase = doc_erase;
- mtd->_read = doc_read;
- mtd->_write = doc_write;
- mtd->_read_oob = doc_read_oob;
- mtd->_write_oob = doc_write_oob;
- this->curfloor = -1;
- this->curchip = -1;
- mutex_init(&this->lock);
-
- /* Ident all the chips present. */
- DoC_ScanChips(this, maxchips);
-
- if (!this->totlen) {
- kfree(mtd);
- iounmap(this->virtadr);
- } else {
- this->nextdoc = doc2klist;
- doc2klist = mtd;
- mtd->size = this->totlen;
- mtd->erasesize = this->erasesize;
- mtd_device_register(mtd, NULL, 0);
- return;
- }
-}
-EXPORT_SYMBOL_GPL(DoC2k_init);
-
-static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
- size_t * retlen, u_char * buf)
-{
- struct DiskOnChip *this = mtd->priv;
- void __iomem *docptr = this->virtadr;
- struct Nand *mychip;
- unsigned char syndrome[6], eccbuf[6];
- volatile char dummy;
- int i, len256 = 0, ret=0;
- size_t left = len;
-
- mutex_lock(&this->lock);
- while (left) {
- len = left;
-
- /* 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)
- 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);
-
- /* Prime the ECC engine */
- WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
- WriteDOC(DOC_ECC_EN, 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;
-
- /* 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 %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(KERN_ERR "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(KERN_DEBUG "ECC DATA at %lxB: %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);
-
- /* 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 + len) & 0x1ff))
- {
- DoC_WaitReady(this);
- }
-
- from += len;
- left -= len;
- buf += len;
- }
-
- mutex_unlock(&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)
-{
- struct DiskOnChip *this = mtd->priv;
- int di; /* Yes, DI is a hangover from when I was disassembling the binary driver */
- void __iomem *docptr = this->virtadr;
- unsigned char eccbuf[6];
- volatile char dummy;
- int len256 = 0;
- struct Nand *mychip;
- size_t left = len;
- int status;
-
- mutex_lock(&this->lock);
- while (left) {
- len = left;
-
- /* 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 */
-/* DBB-
- if (len != 0x200 && eccbuf)
- printk(KERN_WARNING
- "ECC needs a full sector write (adr: %lx size %lx)\n",
- (long) to, (long) len);
- -DBB */
-
- /* 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);
-
- /* Prime the ECC engine */
- WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
- WriteDOC(DOC_ECC_EN | DOC_ECC_RW, 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 flash\n");
- /* Error in programming */
- *retlen = 0;
- mutex_unlock(&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);
-
- 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);
- }
-
- WriteDOC(CDSN_CTRL_ECC_IO | CDSN_CTRL_FLASH_IO | CDSN_CTRL_CE, docptr,
- CDSNControl);
-
- /* 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 %2.2X\n",
- (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 */
-
- if (DoC_is_Millennium(this)) {
- ReadDOC(docptr, ReadPipeInit);
- status = ReadDOC(docptr, LastDataRead);
- } else {
- dummy = ReadDOC(docptr, CDSNSlowIO);
- DoC_Delay(this, 2);
- status = ReadDOC_(docptr, this->ioreg);
- }
-
- if (status & 1) {
- printk(KERN_ERR "Error programming flash\n");
- /* Error in programming */
- *retlen = 0;
- mutex_unlock(&this->lock);
- return -EIO;
- }
-
- /* Let the caller know we completed it */
- *retlen += len;
-
- {
- 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);
- if (ret) {
- mutex_unlock(&this->lock);
- return ret;
- }
- }
-
- to += len;
- left -= len;
- buf += len;
- }
-
- mutex_unlock(&this->lock);
- return 0;
-}
-
-static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
- struct mtd_oob_ops *ops)
-{
- struct DiskOnChip *this = mtd->priv;
- int len256 = 0, ret;
- struct Nand *mychip;
- uint8_t *buf = ops->oobbuf;
- size_t len = ops->len;
-
- BUG_ON(ops->mode != MTD_OPS_PLACE_OOB);
-
- ofs += ops->ooboffs;
-
- mutex_lock(&this->lock);
-
- 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);
-
- ops->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);
-
- mutex_unlock(&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 = mtd->priv;
- int len256 = 0;
- void __iomem *docptr = this->virtadr;
- struct Nand *mychip = &this->chips[ofs >> this->chipshift];
- volatile int dummy;
- int status;
-
- // printk("doc_write_oob(%lx, %d): %2.2X %2.2X %2.2X %2.2X ... %2.2X %2.2X .. %2.2X %2.2X\n",(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 */
-
- if (DoC_is_Millennium(this)) {
- ReadDOC(docptr, ReadPipeInit);
- status = ReadDOC(docptr, LastDataRead);
- } else {
- dummy = ReadDOC(docptr, CDSNSlowIO);
- DoC_Delay(this, 2);
- status = ReadDOC_(docptr, this->ioreg);
- }
-
- if (status & 1) {
- printk(KERN_ERR "Error programming oob data\n");
- /* 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 */
-
- if (DoC_is_Millennium(this)) {
- ReadDOC(docptr, ReadPipeInit);
- status = ReadDOC(docptr, LastDataRead);
- } else {
- dummy = ReadDOC(docptr, CDSNSlowIO);
- DoC_Delay(this, 2);
- status = ReadDOC_(docptr, this->ioreg);
- }
-
- if (status & 1) {
- printk(KERN_ERR "Error programming oob data\n");
- /* There was an error */
- *retlen = 0;
- return -EIO;
- }
-
- *retlen = len;
- return 0;
-
-}
-
-static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
- struct mtd_oob_ops *ops)
-{
- struct DiskOnChip *this = mtd->priv;
- int ret;
-
- BUG_ON(ops->mode != MTD_OPS_PLACE_OOB);
-
- mutex_lock(&this->lock);
- ret = doc_write_oob_nolock(mtd, ofs + ops->ooboffs, ops->len,
- &ops->retlen, ops->oobbuf);
-
- mutex_unlock(&this->lock);
- return ret;
-}
-
-static int doc_erase(struct mtd_info *mtd, struct erase_info *instr)
-{
- struct DiskOnChip *this = mtd->priv;
- __u32 ofs = instr->addr;
- __u32 len = instr->len;
- volatile int dummy;
- void __iomem *docptr = this->virtadr;
- struct Nand *mychip;
- int status;
-
- mutex_lock(&this->lock);
-
- if (ofs & (mtd->erasesize-1) || len & (mtd->erasesize-1)) {
- mutex_unlock(&this->lock);
- return -EINVAL;
- }
-
- instr->state = MTD_ERASING;
-
- /* 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);
-
- if (DoC_is_Millennium(this)) {
- ReadDOC(docptr, ReadPipeInit);
- status = ReadDOC(docptr, LastDataRead);
- } else {
- dummy = ReadDOC(docptr, CDSNSlowIO);
- DoC_Delay(this, 2);
- status = ReadDOC_(docptr, this->ioreg);
- }
-
- if (status & 1) {
- printk(KERN_ERR "Error erasing at 0x%x\n", ofs);
- /* There was an error */
- instr->state = MTD_ERASE_FAILED;
- goto callback;
- }
- ofs += mtd->erasesize;
- len -= mtd->erasesize;
- }
- instr->state = MTD_ERASE_DONE;
-
- callback:
- mtd_erase_callback(instr);
-
- mutex_unlock(&this->lock);
- return 0;
-}
-
-
-/****************************************************************************
- *
- * Module stuff
- *
- ****************************************************************************/
-
-static void __exit cleanup_doc2000(void)
-{
- struct mtd_info *mtd;
- struct DiskOnChip *this;
-
- while ((mtd = doc2klist)) {
- this = mtd->priv;
- doc2klist = this->nextdoc;
-
- mtd_device_unregister(mtd);
-
- iounmap(this->virtadr);
- kfree(this->chips);
- kfree(mtd);
- }
-}
-
-module_exit(cleanup_doc2000);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al.");
-MODULE_DESCRIPTION("MTD driver for DiskOnChip 2000 and Millennium");
-
+++ /dev/null
-
-/*
- * 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].dev_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;
-
- /* FIXME: erase size is not always 8KiB */
- mtd->erasesize = 0x2000;
- mtd->writebufsize = mtd->writesize = 512;
- mtd->oobsize = 16;
- mtd->ecc_strength = 2;
- mtd->owner = THIS_MODULE;
- mtd->_erase = doc_erase;
- mtd->_read = doc_read;
- mtd->_write = doc_write;
- mtd->_read_oob = doc_read_oob;
- mtd->_write_oob = doc_write_oob;
- 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 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)];
-
-#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 ??) */
- 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_OPS_PLACE_OOB);
-
- 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_OPS_PLACE_OOB);
-
- 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");
+++ /dev/null
-/*
- * 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;
-
- pr_debug("_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)
- 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;
-
- /* 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 occasionally 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].dev_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->writebufsize = mtd->writesize = 512;
- mtd->oobsize = 16;
- mtd->ecc_strength = 2;
- mtd->owner = THIS_MODULE;
- mtd->_erase = doc_erase;
- mtd->_read = doc_read;
- mtd->_write = doc_write;
- mtd->_read_oob = doc_read_oob;
- mtd->_write_oob = doc_write_oob;
- 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;
- mtd_device_register(mtd, NULL, 0);
- 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 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 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, 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= %*phC\n", 6, syndrome);
- printk(" eccbuf= %*phC\n", 6, eccbuf);
-#endif
- ret = -EIO;
- }
- }
-
-#ifdef PSYCHO_DEBUG
- printk("ECC DATA at %lx: %*ph\n", (long)from, 6, eccbuf);
-#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 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 ??) */
- 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_OPS_PLACE_OOB);
-
- 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_OPS_PLACE_OOB);
-
- 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;
-
- mtd_device_unregister(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");
+++ /dev/null
-/*
- * ECC algorithm for M-systems disk on chip. We use the excellent Reed
- * Solmon code of Phil Karn (karn@ka9q.ampr.org) available under the
- * GNU GPL License. The rest is simply to convert the disk on chip
- * syndrome into a standard syndome.
- *
- * Author: Fabrice Bellard (fabrice.bellard@netgem.com)
- * Copyright (C) 2000 Netgem S.A.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-#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/mtd/mtd.h>
-#include <linux/mtd/doc2000.h>
-
-#define DEBUG_ECC 0
-/* need to undef it (from asm/termbits.h) */
-#undef B0
-
-#define MM 10 /* Symbol size in bits */
-#define KK (1023-4) /* Number of data symbols per block */
-#define B0 510 /* First root of generator polynomial, alpha form */
-#define PRIM 1 /* power of alpha used to generate roots of generator poly */
-#define NN ((1 << MM) - 1)
-
-typedef unsigned short dtype;
-
-/* 1+x^3+x^10 */
-static const int Pp[MM+1] = { 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1 };
-
-/* This defines the type used to store an element of the Galois Field
- * used by the code. Make sure this is something larger than a char if
- * if anything larger than GF(256) is used.
- *
- * Note: unsigned char will work up to GF(256) but int seems to run
- * faster on the Pentium.
- */
-typedef int gf;
-
-/* No legal value in index form represents zero, so
- * we need a special value for this purpose
- */
-#define A0 (NN)
-
-/* Compute x % NN, where NN is 2**MM - 1,
- * without a slow divide
- */
-static inline gf
-modnn(int x)
-{
- while (x >= NN) {
- x -= NN;
- x = (x >> MM) + (x & NN);
- }
- return x;
-}
-
-#define CLEAR(a,n) {\
-int ci;\
-for(ci=(n)-1;ci >=0;ci--)\
-(a)[ci] = 0;\
-}
-
-#define COPY(a,b,n) {\
-int ci;\
-for(ci=(n)-1;ci >=0;ci--)\
-(a)[ci] = (b)[ci];\
-}
-
-#define COPYDOWN(a,b,n) {\
-int ci;\
-for(ci=(n)-1;ci >=0;ci--)\
-(a)[ci] = (b)[ci];\
-}
-
-#define Ldec 1
-
-/* generate GF(2**m) from the irreducible polynomial p(X) in Pp[0]..Pp[m]
- lookup tables: index->polynomial form alpha_to[] contains j=alpha**i;
- polynomial form -> index form index_of[j=alpha**i] = i
- alpha=2 is the primitive element of GF(2**m)
- HARI's COMMENT: (4/13/94) alpha_to[] can be used as follows:
- Let @ represent the primitive element commonly called "alpha" that
- is the root of the primitive polynomial p(x). Then in GF(2^m), for any
- 0 <= i <= 2^m-2,
- @^i = a(0) + a(1) @ + a(2) @^2 + ... + a(m-1) @^(m-1)
- where the binary vector (a(0),a(1),a(2),...,a(m-1)) is the representation
- of the integer "alpha_to[i]" with a(0) being the LSB and a(m-1) the MSB. Thus for
- example the polynomial representation of @^5 would be given by the binary
- representation of the integer "alpha_to[5]".
- Similarly, index_of[] can be used as follows:
- As above, let @ represent the primitive element of GF(2^m) that is
- the root of the primitive polynomial p(x). In order to find the power
- of @ (alpha) that has the polynomial representation
- a(0) + a(1) @ + a(2) @^2 + ... + a(m-1) @^(m-1)
- we consider the integer "i" whose binary representation with a(0) being LSB
- and a(m-1) MSB is (a(0),a(1),...,a(m-1)) and locate the entry
- "index_of[i]". Now, @^index_of[i] is that element whose polynomial
- representation is (a(0),a(1),a(2),...,a(m-1)).
- NOTE:
- The element alpha_to[2^m-1] = 0 always signifying that the
- representation of "@^infinity" = 0 is (0,0,0,...,0).
- Similarly, the element index_of[0] = A0 always signifying
- that the power of alpha which has the polynomial representation
- (0,0,...,0) is "infinity".
-
-*/
-
-static void
-generate_gf(dtype Alpha_to[NN + 1], dtype Index_of[NN + 1])
-{
- register int i, mask;
-
- mask = 1;
- Alpha_to[MM] = 0;
- for (i = 0; i < MM; i++) {
- Alpha_to[i] = mask;
- Index_of[Alpha_to[i]] = i;
- /* If Pp[i] == 1 then, term @^i occurs in poly-repr of @^MM */
- if (Pp[i] != 0)
- Alpha_to[MM] ^= mask; /* Bit-wise EXOR operation */
- mask <<= 1; /* single left-shift */
- }
- Index_of[Alpha_to[MM]] = MM;
- /*
- * Have obtained poly-repr of @^MM. Poly-repr of @^(i+1) is given by
- * poly-repr of @^i shifted left one-bit and accounting for any @^MM
- * term that may occur when poly-repr of @^i is shifted.
- */
- mask >>= 1;
- for (i = MM + 1; i < NN; i++) {
- if (Alpha_to[i - 1] >= mask)
- Alpha_to[i] = Alpha_to[MM] ^ ((Alpha_to[i - 1] ^ mask) << 1);
- else
- Alpha_to[i] = Alpha_to[i - 1] << 1;
- Index_of[Alpha_to[i]] = i;
- }
- Index_of[0] = A0;
- Alpha_to[NN] = 0;
-}
-
-/*
- * Performs ERRORS+ERASURES decoding of RS codes. bb[] is the content
- * of the feedback shift register after having processed the data and
- * the ECC.
- *
- * Return number of symbols corrected, or -1 if codeword is illegal
- * or uncorrectable. If eras_pos is non-null, the detected error locations
- * are written back. NOTE! This array must be at least NN-KK elements long.
- * The corrected data are written in eras_val[]. They must be xor with the data
- * to retrieve the correct data : data[erase_pos[i]] ^= erase_val[i] .
- *
- * First "no_eras" erasures are declared by the calling program. Then, the
- * maximum # of errors correctable is t_after_eras = floor((NN-KK-no_eras)/2).
- * If the number of channel errors is not greater than "t_after_eras" the
- * transmitted codeword will be recovered. Details of algorithm can be found
- * in R. Blahut's "Theory ... of Error-Correcting Codes".
-
- * Warning: the eras_pos[] array must not contain duplicate entries; decoder failure
- * will result. The decoder *could* check for this condition, but it would involve
- * extra time on every decoding operation.
- * */
-static int
-eras_dec_rs(dtype Alpha_to[NN + 1], dtype Index_of[NN + 1],
- gf bb[NN - KK + 1], gf eras_val[NN-KK], int eras_pos[NN-KK],
- int no_eras)
-{
- int deg_lambda, el, deg_omega;
- int i, j, r,k;
- gf u,q,tmp,num1,num2,den,discr_r;
- gf lambda[NN-KK + 1], s[NN-KK + 1]; /* Err+Eras Locator poly
- * and syndrome poly */
- gf b[NN-KK + 1], t[NN-KK + 1], omega[NN-KK + 1];
- gf root[NN-KK], reg[NN-KK + 1], loc[NN-KK];
- int syn_error, count;
-
- syn_error = 0;
- for(i=0;i<NN-KK;i++)
- syn_error |= bb[i];
-
- if (!syn_error) {
- /* if remainder is zero, data[] is a codeword and there are no
- * errors to correct. So return data[] unmodified
- */
- count = 0;
- goto finish;
- }
-
- for(i=1;i<=NN-KK;i++){
- s[i] = bb[0];
- }
- for(j=1;j<NN-KK;j++){
- if(bb[j] == 0)
- continue;
- tmp = Index_of[bb[j]];
-
- for(i=1;i<=NN-KK;i++)
- s[i] ^= Alpha_to[modnn(tmp + (B0+i-1)*PRIM*j)];
- }
-
- /* undo the feedback register implicit multiplication and convert
- syndromes to index form */
-
- for(i=1;i<=NN-KK;i++) {
- tmp = Index_of[s[i]];
- if (tmp != A0)
- tmp = modnn(tmp + 2 * KK * (B0+i-1)*PRIM);
- s[i] = tmp;
- }
-
- CLEAR(&lambda[1],NN-KK);
- lambda[0] = 1;
-
- if (no_eras > 0) {
- /* Init lambda to be the erasure locator polynomial */
- lambda[1] = Alpha_to[modnn(PRIM * eras_pos[0])];
- for (i = 1; i < no_eras; i++) {
- u = modnn(PRIM*eras_pos[i]);
- for (j = i+1; j > 0; j--) {
- tmp = Index_of[lambda[j - 1]];
- if(tmp != A0)
- lambda[j] ^= Alpha_to[modnn(u + tmp)];
- }
- }
-#if DEBUG_ECC >= 1
- /* Test code that verifies the erasure locator polynomial just constructed
- Needed only for decoder debugging. */
-
- /* find roots of the erasure location polynomial */
- for(i=1;i<=no_eras;i++)
- reg[i] = Index_of[lambda[i]];
- count = 0;
- for (i = 1,k=NN-Ldec; i <= NN; i++,k = modnn(NN+k-Ldec)) {
- q = 1;
- for (j = 1; j <= no_eras; j++)
- if (reg[j] != A0) {
- reg[j] = modnn(reg[j] + j);
- q ^= Alpha_to[reg[j]];
- }
- if (q != 0)
- continue;
- /* store root and error location number indices */
- root[count] = i;
- loc[count] = k;
- count++;
- }
- if (count != no_eras) {
- printf("\n lambda(x) is WRONG\n");
- count = -1;
- goto finish;
- }
-#if DEBUG_ECC >= 2
- printf("\n Erasure positions as determined by roots of Eras Loc Poly:\n");
- for (i = 0; i < count; i++)
- printf("%d ", loc[i]);
- printf("\n");
-#endif
-#endif
- }
- for(i=0;i<NN-KK+1;i++)
- b[i] = Index_of[lambda[i]];
-
- /*
- * Begin Berlekamp-Massey algorithm to determine error+erasure
- * locator polynomial
- */
- r = no_eras;
- el = no_eras;
- while (++r <= NN-KK) { /* r is the step number */
- /* Compute discrepancy at the r-th step in poly-form */
- discr_r = 0;
- for (i = 0; i < r; i++){
- if ((lambda[i] != 0) && (s[r - i] != A0)) {
- discr_r ^= Alpha_to[modnn(Index_of[lambda[i]] + s[r - i])];
- }
- }
- discr_r = Index_of[discr_r]; /* Index form */
- if (discr_r == A0) {
- /* 2 lines below: B(x) <-- x*B(x) */
- COPYDOWN(&b[1],b,NN-KK);
- b[0] = A0;
- } else {
- /* 7 lines below: T(x) <-- lambda(x) - discr_r*x*b(x) */
- t[0] = lambda[0];
- for (i = 0 ; i < NN-KK; i++) {
- if(b[i] != A0)
- t[i+1] = lambda[i+1] ^ Alpha_to[modnn(discr_r + b[i])];
- else
- t[i+1] = lambda[i+1];
- }
- if (2 * el <= r + no_eras - 1) {
- el = r + no_eras - el;
- /*
- * 2 lines below: B(x) <-- inv(discr_r) *
- * lambda(x)
- */
- for (i = 0; i <= NN-KK; i++)
- b[i] = (lambda[i] == 0) ? A0 : modnn(Index_of[lambda[i]] - discr_r + NN);
- } else {
- /* 2 lines below: B(x) <-- x*B(x) */
- COPYDOWN(&b[1],b,NN-KK);
- b[0] = A0;
- }
- COPY(lambda,t,NN-KK+1);
- }
- }
-
- /* Convert lambda to index form and compute deg(lambda(x)) */
- deg_lambda = 0;
- for(i=0;i<NN-KK+1;i++){
- lambda[i] = Index_of[lambda[i]];
- if(lambda[i] != A0)
- deg_lambda = i;
- }
- /*
- * Find roots of the error+erasure locator polynomial by Chien
- * Search
- */
- COPY(®[1],&lambda[1],NN-KK);
- count = 0; /* Number of roots of lambda(x) */
- for (i = 1,k=NN-Ldec; i <= NN; i++,k = modnn(NN+k-Ldec)) {
- q = 1;
- for (j = deg_lambda; j > 0; j--){
- if (reg[j] != A0) {
- reg[j] = modnn(reg[j] + j);
- q ^= Alpha_to[reg[j]];
- }
- }
- if (q != 0)
- continue;
- /* store root (index-form) and error location number */
- root[count] = i;
- loc[count] = k;
- /* If we've already found max possible roots,
- * abort the search to save time
- */
- if(++count == deg_lambda)
- break;
- }
- if (deg_lambda != count) {
- /*
- * deg(lambda) unequal to number of roots => uncorrectable
- * error detected
- */
- count = -1;
- goto finish;
- }
- /*
- * Compute err+eras evaluator poly omega(x) = s(x)*lambda(x) (modulo
- * x**(NN-KK)). in index form. Also find deg(omega).
- */
- deg_omega = 0;
- for (i = 0; i < NN-KK;i++){
- tmp = 0;
- j = (deg_lambda < i) ? deg_lambda : i;
- for(;j >= 0; j--){
- if ((s[i + 1 - j] != A0) && (lambda[j] != A0))
- tmp ^= Alpha_to[modnn(s[i + 1 - j] + lambda[j])];
- }
- if(tmp != 0)
- deg_omega = i;
- omega[i] = Index_of[tmp];
- }
- omega[NN-KK] = A0;
-
- /*
- * Compute error values in poly-form. num1 = omega(inv(X(l))), num2 =
- * inv(X(l))**(B0-1) and den = lambda_pr(inv(X(l))) all in poly-form
- */
- for (j = count-1; j >=0; j--) {
- num1 = 0;
- for (i = deg_omega; i >= 0; i--) {
- if (omega[i] != A0)
- num1 ^= Alpha_to[modnn(omega[i] + i * root[j])];
- }
- num2 = Alpha_to[modnn(root[j] * (B0 - 1) + NN)];
- den = 0;
-
- /* lambda[i+1] for i even is the formal derivative lambda_pr of lambda[i] */
- for (i = min(deg_lambda,NN-KK-1) & ~1; i >= 0; i -=2) {
- if(lambda[i+1] != A0)
- den ^= Alpha_to[modnn(lambda[i+1] + i * root[j])];
- }
- if (den == 0) {
-#if DEBUG_ECC >= 1
- printf("\n ERROR: denominator = 0\n");
-#endif
- /* Convert to dual- basis */
- count = -1;
- goto finish;
- }
- /* Apply error to data */
- if (num1 != 0) {
- eras_val[j] = Alpha_to[modnn(Index_of[num1] + Index_of[num2] + NN - Index_of[den])];
- } else {
- eras_val[j] = 0;
- }
- }
- finish:
- for(i=0;i<count;i++)
- eras_pos[i] = loc[i];
- return count;
-}
-
-/***************************************************************************/
-/* The DOC specific code begins here */
-
-#define SECTOR_SIZE 512
-/* The sector bytes are packed into NB_DATA MM bits words */
-#define NB_DATA (((SECTOR_SIZE + 1) * 8 + 6) / MM)
-
-/*
- * Correct the errors in 'sector[]' by using 'ecc1[]' which is the
- * content of the feedback shift register applyied to the sector and
- * the ECC. Return the number of errors corrected (and correct them in
- * sector), or -1 if error
- */
-int doc_decode_ecc(unsigned char sector[SECTOR_SIZE], unsigned char ecc1[6])
-{
- int parity, i, nb_errors;
- gf bb[NN - KK + 1];
- gf error_val[NN-KK];
- int error_pos[NN-KK], pos, bitpos, index, val;
- dtype *Alpha_to, *Index_of;
-
- /* init log and exp tables here to save memory. However, it is slower */
- Alpha_to = kmalloc((NN + 1) * sizeof(dtype), GFP_KERNEL);
- if (!Alpha_to)
- return -1;
-
- Index_of = kmalloc((NN + 1) * sizeof(dtype), GFP_KERNEL);
- if (!Index_of) {
- kfree(Alpha_to);
- return -1;
- }
-
- generate_gf(Alpha_to, Index_of);
-
- parity = ecc1[1];
-
- bb[0] = (ecc1[4] & 0xff) | ((ecc1[5] & 0x03) << 8);
- bb[1] = ((ecc1[5] & 0xfc) >> 2) | ((ecc1[2] & 0x0f) << 6);
- bb[2] = ((ecc1[2] & 0xf0) >> 4) | ((ecc1[3] & 0x3f) << 4);
- bb[3] = ((ecc1[3] & 0xc0) >> 6) | ((ecc1[0] & 0xff) << 2);
-
- nb_errors = eras_dec_rs(Alpha_to, Index_of, bb,
- error_val, error_pos, 0);
- if (nb_errors <= 0)
- goto the_end;
-
- /* correct the errors */
- for(i=0;i<nb_errors;i++) {
- pos = error_pos[i];
- if (pos >= NB_DATA && pos < KK) {
- nb_errors = -1;
- goto the_end;
- }
- if (pos < NB_DATA) {
- /* extract bit position (MSB first) */
- pos = 10 * (NB_DATA - 1 - pos) - 6;
- /* now correct the following 10 bits. At most two bytes
- can be modified since pos is even */
- index = (pos >> 3) ^ 1;
- bitpos = pos & 7;
- if ((index >= 0 && index < SECTOR_SIZE) ||
- index == (SECTOR_SIZE + 1)) {
- val = error_val[i] >> (2 + bitpos);
- parity ^= val;
- if (index < SECTOR_SIZE)
- sector[index] ^= val;
- }
- index = ((pos >> 3) + 1) ^ 1;
- bitpos = (bitpos + 10) & 7;
- if (bitpos == 0)
- bitpos = 8;
- if ((index >= 0 && index < SECTOR_SIZE) ||
- index == (SECTOR_SIZE + 1)) {
- val = error_val[i] << (8 - bitpos);
- parity ^= val;
- if (index < SECTOR_SIZE)
- sector[index] ^= val;
- }
- }
- }
-
- /* use parity to test extra errors */
- if ((parity & 0xff) != 0)
- nb_errors = -1;
-
- the_end:
- kfree(Alpha_to);
- kfree(Index_of);
- return nb_errors;
-}
-
-EXPORT_SYMBOL_GPL(doc_decode_ecc);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Fabrice Bellard <fabrice.bellard@netgem.com>");
-MODULE_DESCRIPTION("ECC code for correcting errors detected by DiskOnChip 2000 and Millennium ECC hardware");
+++ /dev/null
-
-/* Linux driver for Disk-On-Chip devices */
-/* Probe routines common to all DoC devices */
-/* (C) 1999 Machine Vision Holdings, Inc. */
-/* (C) 1999-2003 David Woodhouse <dwmw2@infradead.org> */
-
-
-/* DOC_PASSIVE_PROBE:
- In order to ensure that the BIOS checksum is correct at boot time, and
- hence that the onboard BIOS extension gets executed, the DiskOnChip
- goes into reset mode when it is read sequentially: all registers
- return 0xff until the chip is woken up again by writing to the
- DOCControl register.
-
- Unfortunately, this means that the probe for the DiskOnChip is unsafe,
- because one of the first things it does is write to where it thinks
- the DOCControl register should be - which may well be shared memory
- for another device. I've had machines which lock up when this is
- attempted. Hence the possibility to do a passive probe, which will fail
- to detect a chip in reset mode, but is at least guaranteed not to lock
- the machine.
-
- If you have this problem, uncomment the following line:
-#define DOC_PASSIVE_PROBE
-*/
-
-
-/* DOC_SINGLE_DRIVER:
- Millennium driver has been merged into DOC2000 driver.
-
- The old Millennium-only driver has been retained just in case there
- are problems with the new code. If the combined driver doesn't work
- for you, you can try the old one by undefining DOC_SINGLE_DRIVER
- below and also enabling it in your configuration. If this fixes the
- problems, please send a report to the MTD mailing list at
- <linux-mtd@lists.infradead.org>.
-*/
-#define DOC_SINGLE_DRIVER
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <asm/errno.h>
-#include <asm/io.h>
-#include <linux/delay.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/types.h>
-
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/nand.h>
-#include <linux/mtd/doc2000.h>
-
-
-static unsigned long doc_config_location = CONFIG_MTD_DOCPROBE_ADDRESS;
-module_param(doc_config_location, ulong, 0);
-MODULE_PARM_DESC(doc_config_location, "Physical memory address at which to probe for DiskOnChip");
-
-static unsigned long __initdata doc_locations[] = {
-#if defined (__alpha__) || defined(__i386__) || defined(__x86_64__)
-#ifdef CONFIG_MTD_DOCPROBE_HIGH
- 0xfffc8000, 0xfffca000, 0xfffcc000, 0xfffce000,
- 0xfffd0000, 0xfffd2000, 0xfffd4000, 0xfffd6000,
- 0xfffd8000, 0xfffda000, 0xfffdc000, 0xfffde000,
- 0xfffe0000, 0xfffe2000, 0xfffe4000, 0xfffe6000,
- 0xfffe8000, 0xfffea000, 0xfffec000, 0xfffee000,
-#else /* CONFIG_MTD_DOCPROBE_HIGH */
- 0xc8000, 0xca000, 0xcc000, 0xce000,
- 0xd0000, 0xd2000, 0xd4000, 0xd6000,
- 0xd8000, 0xda000, 0xdc000, 0xde000,
- 0xe0000, 0xe2000, 0xe4000, 0xe6000,
- 0xe8000, 0xea000, 0xec000, 0xee000,
-#endif /* CONFIG_MTD_DOCPROBE_HIGH */
-#endif
- 0xffffffff };
-
-/* doccheck: Probe a given memory window to see if there's a DiskOnChip present */
-
-static inline int __init doccheck(void __iomem *potential, unsigned long physadr)
-{
- void __iomem *window=potential;
- unsigned char tmp, tmpb, tmpc, ChipID;
-#ifndef DOC_PASSIVE_PROBE
- unsigned char tmp2;
-#endif
-
- /* Routine copied from the Linux DOC driver */
-
-#ifdef CONFIG_MTD_DOCPROBE_55AA
- /* Check for 0x55 0xAA signature at beginning of window,
- this is no longer true once we remove the IPL (for Millennium */
- if (ReadDOC(window, Sig1) != 0x55 || ReadDOC(window, Sig2) != 0xaa)
- return 0;
-#endif /* CONFIG_MTD_DOCPROBE_55AA */
-
-#ifndef DOC_PASSIVE_PROBE
- /* It's not possible to cleanly detect the DiskOnChip - the
- * bootup procedure will put the device into reset mode, and
- * it's not possible to talk to it without actually writing
- * to the DOCControl register. So we store the current contents
- * of the DOCControl register's location, in case we later decide
- * that it's not a DiskOnChip, and want to put it back how we
- * found it.
- */
- tmp2 = ReadDOC(window, DOCControl);
-
- /* Reset the DiskOnChip ASIC */
- WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET,
- window, DOCControl);
- WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET,
- window, DOCControl);
-
- /* Enable the DiskOnChip ASIC */
- WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL,
- window, DOCControl);
- WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL,
- window, DOCControl);
-#endif /* !DOC_PASSIVE_PROBE */
-
- /* We need to read the ChipID register four times. For some
- newer DiskOnChip 2000 units, the first three reads will
- return the DiskOnChip Millennium ident. Don't ask. */
- ChipID = ReadDOC(window, ChipID);
-
- switch (ChipID) {
- case DOC_ChipID_Doc2k:
- /* Check the TOGGLE bit in the ECC register */
- tmp = ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT;
- tmpb = ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT;
- tmpc = ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT;
- if (tmp != tmpb && tmp == tmpc)
- return ChipID;
- break;
-
- case DOC_ChipID_DocMil:
- /* Check for the new 2000 with Millennium ASIC */
- ReadDOC(window, ChipID);
- ReadDOC(window, ChipID);
- if (ReadDOC(window, ChipID) != DOC_ChipID_DocMil)
- ChipID = DOC_ChipID_Doc2kTSOP;
-
- /* Check the TOGGLE bit in the ECC register */
- tmp = ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT;
- tmpb = ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT;
- tmpc = ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT;
- if (tmp != tmpb && tmp == tmpc)
- return ChipID;
- break;
-
- case DOC_ChipID_DocMilPlus16:
- case DOC_ChipID_DocMilPlus32:
- case 0:
- /* Possible Millennium+, need to do more checks */
-#ifndef DOC_PASSIVE_PROBE
- /* Possibly release from power down mode */
- for (tmp = 0; (tmp < 4); tmp++)
- ReadDOC(window, Mplus_Power);
-
- /* Reset the DiskOnChip ASIC */
- tmp = DOC_MODE_RESET | DOC_MODE_MDWREN | DOC_MODE_RST_LAT |
- DOC_MODE_BDECT;
- WriteDOC(tmp, window, Mplus_DOCControl);
- WriteDOC(~tmp, window, Mplus_CtrlConfirm);
-
- mdelay(1);
- /* Enable the DiskOnChip ASIC */
- tmp = DOC_MODE_NORMAL | DOC_MODE_MDWREN | DOC_MODE_RST_LAT |
- DOC_MODE_BDECT;
- WriteDOC(tmp, window, Mplus_DOCControl);
- WriteDOC(~tmp, window, Mplus_CtrlConfirm);
- mdelay(1);
-#endif /* !DOC_PASSIVE_PROBE */
-
- ChipID = ReadDOC(window, ChipID);
-
- switch (ChipID) {
- case DOC_ChipID_DocMilPlus16:
- case DOC_ChipID_DocMilPlus32:
- /* Check the TOGGLE bit in the toggle register */
- tmp = ReadDOC(window, Mplus_Toggle) & DOC_TOGGLE_BIT;
- tmpb = ReadDOC(window, Mplus_Toggle) & DOC_TOGGLE_BIT;
- tmpc = ReadDOC(window, Mplus_Toggle) & DOC_TOGGLE_BIT;
- if (tmp != tmpb && tmp == tmpc)
- return ChipID;
- default:
- break;
- }
- /* FALL TRHU */
-
- default:
-
-#ifdef CONFIG_MTD_DOCPROBE_55AA
- printk(KERN_DEBUG "Possible DiskOnChip with unknown ChipID %2.2X found at 0x%lx\n",
- ChipID, physadr);
-#endif
-#ifndef DOC_PASSIVE_PROBE
- /* Put back the contents of the DOCControl register, in case it's not
- * actually a DiskOnChip.
- */
- WriteDOC(tmp2, window, DOCControl);
-#endif
- return 0;
- }
-
- printk(KERN_WARNING "DiskOnChip failed TOGGLE test, dropping.\n");
-
-#ifndef DOC_PASSIVE_PROBE
- /* Put back the contents of the DOCControl register: it's not a DiskOnChip */
- WriteDOC(tmp2, window, DOCControl);
-#endif
- return 0;
-}
-
-static int docfound;
-
-extern void DoC2k_init(struct mtd_info *);
-extern void DoCMil_init(struct mtd_info *);
-extern void DoCMilPlus_init(struct mtd_info *);
-
-static void __init DoC_Probe(unsigned long physadr)
-{
- void __iomem *docptr;
- struct DiskOnChip *this;
- struct mtd_info *mtd;
- int ChipID;
- char namebuf[15];
- char *name = namebuf;
- void (*initroutine)(struct mtd_info *) = NULL;
-
- docptr = ioremap(physadr, DOC_IOREMAP_LEN);
-
- if (!docptr)
- return;
-
- if ((ChipID = doccheck(docptr, physadr))) {
- if (ChipID == DOC_ChipID_Doc2kTSOP) {
- /* Remove this at your own peril. The hardware driver works but nothing prevents you from erasing bad blocks */
- printk(KERN_NOTICE "Refusing to drive DiskOnChip 2000 TSOP until Bad Block Table is correctly supported by INFTL\n");
- iounmap(docptr);
- return;
- }
- docfound = 1;
- mtd = kzalloc(sizeof(struct DiskOnChip) + sizeof(struct mtd_info), GFP_KERNEL);
- if (!mtd) {
- printk(KERN_WARNING "Cannot allocate memory for data structures. Dropping.\n");
- iounmap(docptr);
- return;
- }
-
- this = (struct DiskOnChip *)(&mtd[1]);
- mtd->priv = this;
- this->virtadr = docptr;
- this->physadr = physadr;
- this->ChipID = ChipID;
- sprintf(namebuf, "with ChipID %2.2X", ChipID);
-
- switch(ChipID) {
- case DOC_ChipID_Doc2kTSOP:
- name="2000 TSOP";
- initroutine = symbol_request(DoC2k_init);
- break;
-
- case DOC_ChipID_Doc2k:
- name="2000";
- initroutine = symbol_request(DoC2k_init);
- break;
-
- case DOC_ChipID_DocMil:
- name="Millennium";
-#ifdef DOC_SINGLE_DRIVER
- initroutine = symbol_request(DoC2k_init);
-#else
- initroutine = symbol_request(DoCMil_init);
-#endif /* DOC_SINGLE_DRIVER */
- break;
-
- case DOC_ChipID_DocMilPlus16:
- case DOC_ChipID_DocMilPlus32:
- name="MillenniumPlus";
- initroutine = symbol_request(DoCMilPlus_init);
- break;
- }
-
- if (initroutine) {
- (*initroutine)(mtd);
- symbol_put_addr(initroutine);
- return;
- }
- printk(KERN_NOTICE "Cannot find driver for DiskOnChip %s at 0x%lX\n", name, physadr);
- kfree(mtd);
- }
- iounmap(docptr);
-}
-
-
-/****************************************************************************
- *
- * Module stuff
- *
- ****************************************************************************/
-
-static int __init init_doc(void)
-{
- int i;
-
- if (doc_config_location) {
- printk(KERN_INFO "Using configured DiskOnChip probe address 0x%lx\n", doc_config_location);
- DoC_Probe(doc_config_location);
- } else {
- for (i=0; (doc_locations[i] != 0xffffffff); i++) {
- DoC_Probe(doc_locations[i]);
- }
- }
- /* No banner message any more. Print a message if no DiskOnChip
- found, so the user knows we at least tried. */
- if (!docfound)
- printk(KERN_INFO "No recognised DiskOnChip devices found\n");
- return -EAGAIN;
-}
-
-module_init(init_doc);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
-MODULE_DESCRIPTION("Probe code for DiskOnChip 2000 and Millennium devices");
-
projects / deliverable / linux.git / commitdiff
