[MTD] DOC: Fixup read functions and do a little cleanup

The NAND rework resulted in non ECC based reads. Fix it up and
do a bit of cleanup while at it.

Pointed out by Adrian Bunk.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 73 insertions, 106 deletions

diff --git a/drivers/mtd/devices/doc2000.c b/drivers/mtd/devices/doc2000.c
index c54e40464d8..603a7951ac9 100644
--- a/drivers/mtd/devices/doc2000.c
+++ b/drivers/mtd/devices/doc2000.c
@@ -55,10 +55,6 @@ static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
                     size_t *retlen, u_char *buf);
 static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
                      size_t *retlen, const u_char *buf);
-static int doc_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,
-                        size_t *retlen, u_char *buf, u_char *eccbuf, struct nand_oobinfo *oobsel);
-static int doc_write_ecc(struct mtd_info *mtd, loff_t to, size_t len,
-                         size_t *retlen, const u_char *buf, u_char *eccbuf, struct nand_oobinfo *oobsel);
 static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
                         struct mtd_oob_ops *ops);
 static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
@@ -615,17 +611,10 @@ 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)
 {
-        /* Just a special case of doc_read_ecc */
-        return doc_read_ecc(mtd, from, len, retlen, buf, NULL, NULL);
-}
-
-static int doc_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,
-                        size_t * retlen, u_char * buf, u_char * eccbuf, struct nand_oobinfo *oobsel)
-{
         struct DiskOnChip *this = mtd->priv;
         void __iomem *docptr = this->virtadr;
         struct Nand *mychip;
-        unsigned char syndrome[6];
+        unsigned char syndrome[6], eccbuf[6];
         volatile char dummy;
         int i, len256 = 0, ret=0;
         size_t left = len;
@@ -673,15 +662,9 @@ static int doc_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,
                 DoC_Address(this, ADDR_COLUMN_PAGE, from, CDSN_CTRL_WP,
                             CDSN_CTRL_ECC_IO);
 
-                if (eccbuf) {
-                        /* Prime the ECC engine */
-                        WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
-                        WriteDOC(DOC_ECC_EN, docptr, ECCConf);
-                } else {
-                        /* disable the ECC engine */
-                        WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
-                        WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
-                }
+                /* 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) {
@@ -698,58 +681,59 @@ static int doc_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,
                 /* Let the caller know we completed it */
                 *retlen += len;
 
-                if (eccbuf) {
-                        /* 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);
-                        }
+                /* 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);
 
-                        /* Check the ECC Status */
-                        if (i & 0x80) {
-                                int nb_errors;
-                                /* There was an ECC error */
+                /* 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);
+                        printk(KERN_ERR "DiskOnChip ECC Error: Read at %lx\n", (long)from);
 #endif
-                                /* Read the ECC syndrom through the DiskOnChip ECC logic.
-                                   These syndrome will be all ZERO when there is no error */
-                                for (i = 0; i < 6; i++) {
-                                        syndrome[i] =
-                                            ReadDOC(docptr, ECCSyndrome0 + i);
-                                }
-                                nb_errors = doc_decode_ecc(buf, syndrome);
+                        /* Read the ECC syndrom through the DiskOnChip ECC
+                           logic.  These syndrome will be all ZERO when there
+                           is no error */
+                        for (i = 0; i < 6; i++) {
+                                syndrome[i] =
+                                        ReadDOC(docptr, ECCSyndrome0 + i);
+                        }
+                        nb_errors = doc_decode_ecc(buf, syndrome);
 
 #ifdef ECC_DEBUG
-                                printk(KERN_ERR "Errors corrected: %x\n", nb_errors);
+                        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;
-                                }
+                        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]);
+                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);
-                }
+                /* 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.  */
@@ -771,17 +755,10 @@ static int doc_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,
 static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
                      size_t * retlen, const u_char * buf)
 {
-        char eccbuf[6];
-        return doc_write_ecc(mtd, to, len, retlen, buf, eccbuf, NULL);
-}
-
-static int doc_write_ecc(struct mtd_info *mtd, loff_t to, size_t len,
-                         size_t * retlen, const u_char * buf,
-                         u_char * eccbuf, struct nand_oobinfo *oobsel)
-{
         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;
@@ -835,15 +812,9 @@ static int doc_write_ecc(struct mtd_info *mtd, loff_t to, size_t len,
                 DoC_Command(this, NAND_CMD_SEQIN, 0);
                 DoC_Address(this, ADDR_COLUMN_PAGE, to, 0, CDSN_CTRL_ECC_IO);
 
-                if (eccbuf) {
-                        /* Prime the ECC engine */
-                        WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
-                        WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf);
-                } else {
-                        /* disable the ECC engine */
-                        WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
-                        WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
-                }
+                /* 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) {
@@ -873,39 +844,35 @@ static int doc_write_ecc(struct mtd_info *mtd, loff_t to, size_t len,
 
                 DoC_WriteBuf(this, &buf[len256], len - len256);
 
-                if (eccbuf) {
-                        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_CE, docptr, CDSNControl);
 
-                        WriteDOC(CDSN_CTRL_ECC_IO | CDSN_CTRL_FLASH_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);
+                }
 
-                        /* Read the ECC data through the DiskOnChip ECC logic */
-                        for (di = 0; di < 6; di++) {
-                                eccbuf[di] = ReadDOC(docptr, ECCSyndrome0 + di);
-                        }
+                WriteDOC(CDSN_CTRL_ECC_IO | CDSN_CTRL_FLASH_IO | CDSN_CTRL_CE, docptr,
+                         CDSNControl);
 
-                        /* Reset the ECC engine */
-                        WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
+                /* 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]);
+                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);