[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>

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,
@@ -614,18 +610,11 @@ 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.  */
@@ -770,18 +754,11 @@ 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);

drivers/mtd/devices/doc2001.c

@@ -37,12 +37,6 @@ 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,
@@ -396,18 +390,10 @@ 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)
-{
-	/* Just a special case of doc_read_ecc */
-	return doc_read_ecc(mtd, from, len, retlen, buf, NULL, NULL);
-}
-
-static int doc_read_ecc (struct mtd_info *mtd, loff_t from, size_t len,
-			 size_t *retlen, u_char *buf, u_char *eccbuf,
-			 struct nand_oobinfo *oobsel)
 {
 	int i, ret;
 	volatile char dummy;
-	unsigned char syndrome[6];
+	unsigned char syndrome[6], eccbuf[6];
 	struct DiskOnChip *this = mtd->priv;
 	void __iomem *docptr = this->virtadr;
 	struct Nand *mychip = &this->chips[from >> (this->chipshift)];
@@ -437,15 +423,9 @@ static int doc_read_ecc (struct mtd_info *mtd, loff_t from, size_t len,
 	DoC_Address(docptr, 3, from, CDSN_CTRL_WP, 0x00);
 	DoC_WaitReady(docptr);
 
-	if (eccbuf) {
-		/* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
-		WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
-		WriteDOC (DOC_ECC_EN, docptr, ECCConf);
-	} else {
-		/* disable the ECC engine */
-		WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
-		WriteDOC (DOC_ECC_DIS, docptr, ECCConf);
-	}
+	/* 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 */
@@ -465,74 +445,65 @@ static int doc_read_ecc (struct mtd_info *mtd, loff_t from, size_t len,
 	*retlen = len;
         ret = 0;
 
-	if (eccbuf) {
-		/* Read the ECC data from Spare Data Area,
-		   see Reed-Solomon EDC/ECC 11.1 */
-		dummy = ReadDOC(docptr, ReadPipeInit);
+	/* 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);
-		}
+	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);
+	memcpy_fromio(eccbuf, docptr + DoC_Mil_CDSN_IO, 5);
 #endif
-		eccbuf[5] = ReadDOC(docptr, LastDataRead);
+	eccbuf[5] = ReadDOC(docptr, LastDataRead);
 
-		/* Flush the pipeline */
-		dummy = ReadDOC(docptr, ECCConf);
-		dummy = ReadDOC(docptr, ECCConf);
+	/* 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 */
+	/* 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);
+		printk("DiskOnChip ECC Error: Read at %lx\n", (long)from);
 #endif
-			/* Read the ECC syndrom through the DiskOnChip ECC logic.
-			   These syndrome will be all ZERO when there is no error */
-			for (i = 0; i < 6; i++) {
-				syndrome[i] = ReadDOC(docptr, ECCSyndrome0 + i);
-			}
-                        nb_errors = doc_decode_ecc(buf, syndrome);
+		/* Read the ECC syndrom through the DiskOnChip ECC logic.
+		   These syndrome will be all ZERO when there is no error */
+		for (i = 0; i < 6; i++) {
+			syndrome[i] = ReadDOC(docptr, ECCSyndrome0 + i);
+		}
+		nb_errors = doc_decode_ecc(buf, syndrome);
 #ifdef ECC_DEBUG
-			printk("ECC Errors corrected: %x\n", nb_errors);
+		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;
-                        }
+		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]);
+	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);
-	}
+	/* disable the ECC engine */
+	WriteDOC(DOC_ECC_DIS, docptr , ECCConf);
 
 	return ret;
 }
 
 static int doc_write (struct mtd_info *mtd, loff_t to, size_t len,
 		      size_t *retlen, const u_char *buf)
-{
-	char eccbuf[6];
-	return doc_write_ecc(mtd, to, len, retlen, buf, eccbuf, NULL);
-}
-
-static int doc_write_ecc (struct mtd_info *mtd, loff_t to, size_t len,
-			  size_t *retlen, const u_char *buf, u_char *eccbuf,
-			 struct nand_oobinfo *oobsel)
 {
 	int i,ret = 0;
+	char eccbuf[6];
 	volatile char dummy;
 	struct DiskOnChip *this = mtd->priv;
 	void __iomem *docptr = this->virtadr;
@@ -573,15 +544,9 @@ static int doc_write_ecc (struct mtd_info *mtd, loff_t to, size_t len,
 	DoC_Address(docptr, 3, to, 0x00, 0x00);
 	DoC_WaitReady(docptr);
 
-	if (eccbuf) {
-		/* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
-		WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
-		WriteDOC (DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf);
-	} else {
-		/* disable the ECC engine */
-		WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
-		WriteDOC (DOC_ECC_DIS, docptr, ECCConf);
-	}
+	/* 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 */
@@ -596,46 +561,44 @@ static int doc_write_ecc (struct mtd_info *mtd, loff_t to, size_t len,
 #endif
 	WriteDOC(0x00, docptr, WritePipeTerm);
 
-	if (eccbuf) {
-		/* Write ECC data to flash, the ECC info is generated by the DiskOnChip ECC logic
-		   see Reed-Solomon EDC/ECC 11.1 */
-		WriteDOC(0, docptr, NOP);
-		WriteDOC(0, docptr, NOP);
-		WriteDOC(0, docptr, NOP);
+	/* 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);
-		}
+	/* 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);
+	/* 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);
-		}
+	/* 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);
+	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);
+	/* 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);
+	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]);
+	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.*/

drivers/mtd/devices/doc2001plus.c

@@ -41,12 +41,6 @@ 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,
@@ -594,19 +588,11 @@ static int doc_dumpblk(struct mtd_info *mtd, loff_t from)
 
 static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
 		    size_t *retlen, u_char *buf)
-{
-	/* Just a special case of doc_read_ecc */
-	return doc_read_ecc(mtd, from, len, retlen, buf, NULL, NULL);
-}
-
-static int doc_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,
-			size_t *retlen, u_char *buf, u_char *eccbuf,
-			struct nand_oobinfo *oobsel)
 {
 	int ret, i;
 	volatile char dummy;
 	loff_t fofs;
-	unsigned char syndrome[6];
+	unsigned char syndrome[6], eccbuf[6];
 	struct DiskOnChip *this = mtd->priv;
 	void __iomem * docptr = this->virtadr;
 	struct Nand *mychip = &this->chips[from >> (this->chipshift)];
@@ -644,56 +630,51 @@ static int doc_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,
 	WriteDOC(0, docptr, Mplus_FlashControl);
 	DoC_WaitReady(docptr);
 
-	if (eccbuf) {
-		/* 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);
-	} else {
-		/* disable the ECC engine */
-		WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
-	}
+	/* 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;
+	ret = 0;
 
 	ReadDOC(docptr, Mplus_ReadPipeInit);
 	ReadDOC(docptr, Mplus_ReadPipeInit);
 
-	if (eccbuf) {
-		/* Read the data via the internal pipeline through CDSN IO
-		   register, see Pipelined Read Operations 11.3 */
-		MemReadDOC(docptr, buf, len);
+	/* 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);
+	/* 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);
+	/* 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 */
+	/* 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);
+		printk("DiskOnChip ECC Error: Read at %lx\n", (long)from);
 #endif
-			/* Read the ECC syndrom through the DiskOnChip ECC logic.
-			   These syndrome will be all ZERO when there is no error */
-			for (i = 0; i < 6; i++)
-				syndrome[i] = ReadDOC(docptr, Mplus_ECCSyndrome0 + i);
+		/* 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, Mplus_ECCSyndrome0 + i);
 
-                        nb_errors = doc_decode_ecc(buf, syndrome);
+		nb_errors = doc_decode_ecc(buf, syndrome);
 #ifdef ECC_DEBUG
-			printk("ECC Errors corrected: %x\n", nb_errors);
+		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 */
+		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);
@@ -707,24 +688,16 @@ static int doc_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,
 				eccbuf[3], eccbuf[4], eccbuf[5]);
 #endif
 				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]);
+	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 , Mplus_ECCConf);
-	} else {
-		/* Read the data via the internal pipeline through CDSN IO
-		   register, see Pipelined Read Operations 11.3 */
-		MemReadDOC(docptr, buf, len-2);
-		buf[len-2] = ReadDOC(docptr, Mplus_LastDataRead);
-		buf[len-1] = ReadDOC(docptr, Mplus_LastDataRead);
-	}
+	/* disable the ECC engine */
+	WriteDOC(DOC_ECC_DIS, docptr , Mplus_ECCConf);
 
 	/* Disable flash internally */
 	WriteDOC(0, docptr, Mplus_FlashSelect);
@@ -734,18 +707,11 @@ 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)
 {
 	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)];
@@ -795,46 +761,42 @@ static int doc_write_ecc(struct mtd_info *mtd, loff_t to, size_t len,
 	/* Disable the ECC engine */
 	WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
 
-	if (eccbuf) {
-		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);
+	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);
 
-	if (eccbuf) {
-		/* 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);
+	/* 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);
+	/* 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);
+	/* disable the ECC engine */
+	WriteDOC(DOC_ECC_DIS, docptr, Mplus_ECCConf);
 
-		/* Write the ECC data to flash */
-		MemWriteDOC(docptr, eccbuf, 6);
+	/* 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);
-		}
+	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]);
+	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);