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/*

 * Linux driver for Disk-On-Chip 2000 and Millennium

 * (c) 1999 Machine Vision Holdings, Inc.

 * (c) 1999, 2000 David Woodhouse <dwmw2@infradead.org>

 *

 * $Id: doc2000.c,v 1.67 2005/11/07 11:14:24 gleixner Exp $

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <asm/errno.h>

#include <asm/io.h>

#include <asm/uaccess.h>

#include <linux/miscdevice.h>

#include <linux/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);

        DEBUG(MTD_DEBUG_LEVEL3,

              "_DoC_WaitReady called for out-of-line wait\n");

        /* Out-of-line routine to wait for chip response */

        while (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) {

                /* 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)) {

                        DEBUG(MTD_DEBUG_LEVEL2, "_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)) {

                DEBUG(MTD_DEBUG_LEVEL2,

                      "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)) {

                DEBUG(MTD_DEBUG_LEVEL2,

                      "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 another the same the first */

                else

                        printk(KERN_WARNING

                               "Flash chip at floor %d, chip %d is different:\n",

                               floor, chip);

        }

        /* Print and store the manufacturer and ID codes. */

        for (i = 0; nand_flash_ids[i].name != NULL; i++) {

                if (id == nand_flash_ids[i].id) {

                        /* Try to identify manufacturer */

                        for (j = 0; nand_manuf_ids[j].id != 0x0; j++) {

                                if (nand_manuf_ids[j].id == mfr)

                                        break;

                        }

                        printk(KERN_INFO

                               "Flash chip found: Manufacturer ID: %2.2X, "

                               "Chip ID: %2.2X (%s:%s)\n", mfr, id,

                               nand_manuf_ids[j].name, nand_flash_ids[i].name);

                        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->size = 0;

        mtd->erasesize = 0;

        mtd->writesize = 512;

        mtd->oobsize = 16;

        mtd->owner = THIS_MODULE;

        mtd->erase = doc_erase;

        mtd->point = NULL;

        mtd->unpoint = NULL;

        mtd->read = doc_read;

        mtd->write = doc_write;

        mtd->read_oob = doc_read_oob;

        mtd->write_oob = doc_write_oob;

        mtd->sync = NULL;

        this->totlen = 0;

        this->numchips = 0;

        this->curfloor = -1;

        this->curchip = -1;

        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;

                add_mtd_device(mtd);

                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;

        /* Don't allow read past end of device */

        if (from >= this->totlen)

                return -EINVAL;

        mutex_lock(&this->lock);

        *retlen = 0;

        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 && eccbuf)

                        printk(KERN_WARNING

                               "ECC needs a full sector read (adr: %lx size %lx)\n",

                               (long) from, (long) len);

                /* printk("DoC_Read (adr: %lx size %lx)\n", (long) from, (long) len); */

                /* Find the chip which is to be used and select it */

                mychip = &this->chips[from >> (this->chipshift)];

                if (this->curfloor != mychip->floor) {

                        DoC_SelectFloor(this, mychip->floor);

                        DoC_SelectChip(this, mychip->chip);

                } else if (this->curchip != mychip->chip) {

                        DoC_SelectChip(this, mychip->chip);

                }

                this->curfloor = mychip->floor;

                this->curchip = mychip->chip;

                DoC_Command(this,

                            (!this->page256

                             && (from & 0x100)) ? NAND_CMD_READ1 : NAND_CMD_READ0,

                            CDSN_CTRL_WP);

                DoC_Address(this, ADDR_COLUMN_PAGE, from, CDSN_CTRL_WP,

                            CDSN_CTRL_ECC_IO);

                /* 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) {