Merge branch 'master' of git://git.infradead.org/~kmpark/onenand-mtd-2.6

3 files changed, 124 insertions, 74 deletions

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 63ca61b..2da6bb2 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -192,8 +192,6 @@ static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t le
 	struct onenand_chip *this = mtd->priv;
 	int value, readcmd = 0, block_cmd = 0;
 	int block, page;
-	/* Now we use page size operation */
-	int sectors = 4, count = 4;
 
 	/* Address translation */
 	switch (cmd) {
@@ -245,6 +243,8 @@ static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t le
 	}
 
 	if (page != -1) {
+		/* Now we use page size operation */
+		int sectors = 4, count = 4;
 		int dataram;
 
 		switch (cmd) {
@@ -298,7 +298,7 @@ static int onenand_wait(struct mtd_info *mtd, int state)
 	unsigned long timeout;
 	unsigned int flags = ONENAND_INT_MASTER;
 	unsigned int interrupt = 0;
-	unsigned int ctrl, ecc;
+	unsigned int ctrl;
 
 	/* The 20 msec is enough */
 	timeout = jiffies + msecs_to_jiffies(20);
@@ -310,7 +310,6 @@ static int onenand_wait(struct mtd_info *mtd, int state)
 
 		if (state != FL_READING)
 			cond_resched();
-		touch_softlockup_watchdog();
 	}
 	/* To get correct interrupt status in timeout case */
 	interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
@@ -318,24 +317,20 @@ static int onenand_wait(struct mtd_info *mtd, int state)
 	ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
 
 	if (ctrl & ONENAND_CTRL_ERROR) {
-		/* It maybe occur at initial bad block */
 		DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: controller error = 0x%04x\n", ctrl);
-		/* Clear other interrupt bits for preventing ECC error */
-		interrupt &= ONENAND_INT_MASTER;
-	}
-
-	if (ctrl & ONENAND_CTRL_LOCK) {
-		DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: it's locked error = 0x%04x\n", ctrl);
-		return -EACCES;
+		if (ctrl & ONENAND_CTRL_LOCK)
+			DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: it's locked error.\n");
+		return ctrl;
 	}
 
 	if (interrupt & ONENAND_INT_READ) {
-		ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
+		int ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
 		if (ecc) {
 			DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: ECC error = 0x%04x\n", ecc);
-			if (ecc & ONENAND_ECC_2BIT_ALL)
+			if (ecc & ONENAND_ECC_2BIT_ALL) {
 				mtd->ecc_stats.failed++;
-			else if (ecc & ONENAND_ECC_1BIT_ALL)
+				return ecc;
+			} else if (ecc & ONENAND_ECC_1BIT_ALL)
 				mtd->ecc_stats.corrected++;
 		}
 	}
@@ -372,9 +367,6 @@ static int onenand_interrupt_wait(struct mtd_info *mtd, int state)
 {
 	struct onenand_chip *this = mtd->priv;
 
-	/* To prevent soft lockup */
-	touch_softlockup_watchdog();
-
 	wait_for_completion(&this->complete);
 
 	return onenand_wait(mtd, state);
@@ -395,9 +387,6 @@ static int onenand_try_interrupt_wait(struct mtd_info *mtd, int state)
 	/* We use interrupt wait first */
 	this->wait = onenand_interrupt_wait;
 
-	/* To prevent soft lockup */
-	touch_softlockup_watchdog();
-
 	timeout = msecs_to_jiffies(100);
 	remain = wait_for_completion_timeout(&this->complete, timeout);
 	if (!remain) {
@@ -721,7 +710,7 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
 	struct mtd_ecc_stats stats;
 	int read = 0, column;
 	int thislen;
-	int ret = 0;
+	int ret = 0, boundary = 0;
 
 	DEBUG(MTD_DEBUG_LEVEL3, "onenand_read: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 
@@ -738,38 +727,60 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
 	/* TODO handling oob */
 
 	stats = mtd->ecc_stats;
-	while (read < len) {
-		thislen = min_t(int, mtd->writesize, len - read);
-
-		column = from & (mtd->writesize - 1);
-		if (column + thislen > mtd->writesize)
-			thislen = mtd->writesize - column;
-
-		if (!onenand_check_bufferram(mtd, from)) {
-			this->command(mtd, ONENAND_CMD_READ, from, mtd->writesize);
-
-			ret = this->wait(mtd, FL_READING);
-			/* First copy data and check return value for ECC handling */
-			onenand_update_bufferram(mtd, from, 1);
-		}
-
-		this->read_bufferram(mtd, ONENAND_DATARAM, buf, column, thislen);
-
-		read += thislen;
 
-		if (read == len)
-			break;
+ 	/* Read-while-load method */
+
+ 	/* Do first load to bufferRAM */
+ 	if (read < len) {
+ 		if (!onenand_check_bufferram(mtd, from)) {
+ 			this->command(mtd, ONENAND_CMD_READ, from, mtd->writesize);
+ 			ret = this->wait(mtd, FL_READING);
+ 			onenand_update_bufferram(mtd, from, !ret);
+ 		}
+ 	}
+
+ 	thislen = min_t(int, mtd->writesize, len - read);
+ 	column = from & (mtd->writesize - 1);
+ 	if (column + thislen > mtd->writesize)
+ 		thislen = mtd->writesize - column;
+
+ 	while (!ret) {
+ 		/* If there is more to load then start next load */
+ 		from += thislen;
+ 		if (read + thislen < len) {
+ 			this->command(mtd, ONENAND_CMD_READ, from, mtd->writesize);
+ 			/*
+ 			 * Chip boundary handling in DDP
+ 			 * Now we issued chip 1 read and pointed chip 1
+ 			 * bufferam so we have to point chip 0 bufferam.
+ 			 */
+ 			if (this->device_id & ONENAND_DEVICE_IS_DDP &&
+ 					unlikely(from == (this->chipsize >> 1))) {
+ 				this->write_word(0, this->base + ONENAND_REG_START_ADDRESS2);
+ 				boundary = 1;
+ 			} else
+ 				boundary = 0;
+ 			ONENAND_SET_PREV_BUFFERRAM(this);
+ 		}
+ 		/* While load is going, read from last bufferRAM */
+ 		this->read_bufferram(mtd, ONENAND_DATARAM, buf, column, thislen);
+ 		/* See if we are done */
+ 		read += thislen;
+ 		if (read == len)
+ 			break;
+ 		/* Set up for next read from bufferRAM */
+ 		if (unlikely(boundary))
+ 			this->write_word(0x8000, this->base + ONENAND_REG_START_ADDRESS2);
+ 		ONENAND_SET_NEXT_BUFFERRAM(this);
+ 		buf += thislen;
+ 		thislen = min_t(int, mtd->writesize, len - read);
+ 		column = 0;
+ 		cond_resched();
+ 		/* Now wait for load */
+ 		ret = this->wait(mtd, FL_READING);
+ 		onenand_update_bufferram(mtd, from, !ret);
+ 	}
 
-		if (ret) {
-			DEBUG(MTD_DEBUG_LEVEL0, "onenand_read: read failed = %d\n", ret);
-			goto out;
-		}
-
-		from += thislen;
-		buf += thislen;
-	}
-
-out:
 	/* Deselect and wake up anyone waiting on the device */
 	onenand_release_device(mtd);
 
@@ -783,6 +794,9 @@ out:
 	if (mtd->ecc_stats.failed - stats.failed)
 		return -EBADMSG;
 
+	if (ret)
+		return ret;
+
 	return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
 }
 
@@ -820,6 +834,8 @@ int onenand_do_read_oob(struct mtd_info *mtd, loff_t from, size_t len,
 	column = from & (mtd->oobsize - 1);
 
 	while (read < len) {
+		cond_resched();
+
 		thislen = mtd->oobsize - column;
 		thislen = min_t(int, thislen, len);
 
@@ -832,16 +848,16 @@ int onenand_do_read_oob(struct mtd_info *mtd, loff_t from, size_t len,
 
 		this->read_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
 
+		if (ret) {
+			DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_oob: read failed = 0x%x\n", ret);
+			goto out;
+		}
+
 		read += thislen;
 
 		if (read == len)
 			break;
 
-		if (ret) {
-			DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_oob: read failed = %d\n", ret);
-			goto out;
-		}
-
 		buf += thislen;
 
 		/* Read more? */
@@ -919,6 +935,10 @@ static int onenand_verify_page(struct mtd_info *mtd, u_char *buf, loff_t addr)
 	void __iomem *dataram0, *dataram1;
 	int ret = 0;
 
+	/* In partial page write, just skip it */
+	if ((addr & (mtd->writesize - 1)) != 0)
+		return 0;
+
 	this->command(mtd, ONENAND_CMD_READ, addr, mtd->writesize);
 
 	ret = this->wait(mtd, FL_READING);
@@ -941,7 +961,7 @@ static int onenand_verify_page(struct mtd_info *mtd, u_char *buf, loff_t addr)
 #define onenand_verify_oob(...)		(0)
 #endif
 
-#define NOTALIGNED(x)	((x & (mtd->writesize - 1)) != 0)
+#define NOTALIGNED(x)	((x & (this->subpagesize - 1)) != 0)
 
 /**
  * onenand_write - [MTD Interface] write buffer to FLASH
@@ -959,6 +979,7 @@ static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
 	struct onenand_chip *this = mtd->priv;
 	int written = 0;
 	int ret = 0;
+	int column, subpage;
 
 	DEBUG(MTD_DEBUG_LEVEL3, "onenand_write: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
 
@@ -977,45 +998,63 @@ static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
                 return -EINVAL;
         }
 
+	column = to & (mtd->writesize - 1);
+	subpage = column || (len & (mtd->writesize - 1));
+
 	/* Grab the lock and see if the device is available */
 	onenand_get_device(mtd, FL_WRITING);
 
 	/* Loop until all data write */
 	while (written < len) {
-		int thislen = min_t(int, mtd->writesize, len - written);
-
-		this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->writesize);
+		int bytes = mtd->writesize;
+		int thislen = min_t(int, bytes, len - written);
+		u_char *wbuf = (u_char *) buf;
+
+		cond_resched();
+
+		this->command(mtd, ONENAND_CMD_BUFFERRAM, to, bytes);
+
+		/* Partial page write */
+		if (subpage) {
+			bytes = min_t(int, bytes - column, (int) len);
+			memset(this->page_buf, 0xff, mtd->writesize);
+			memcpy(this->page_buf + column, buf, bytes);
+			wbuf = this->page_buf;
+			/* Even though partial write, we need page size */
+			thislen = mtd->writesize;
+		}
 
-		this->write_bufferram(mtd, ONENAND_DATARAM, buf, 0, thislen);
+		this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, thislen);
 		this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
 
 		this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
 
-		onenand_update_bufferram(mtd, to, 1);
+		/* In partial page write we don't update bufferram */
+		onenand_update_bufferram(mtd, to, !subpage);
 
 		ret = this->wait(mtd, FL_WRITING);
 		if (ret) {
 			DEBUG(MTD_DEBUG_LEVEL0, "onenand_write: write filaed %d\n", ret);
-			goto out;
+			break;
 		}
 
-		written += thislen;
-
 		/* Only check verify write turn on */
-		ret = onenand_verify_page(mtd, (u_char *) buf, to);
+		ret = onenand_verify_page(mtd, (u_char *) wbuf, to);
 		if (ret) {
 			DEBUG(MTD_DEBUG_LEVEL0, "onenand_write: verify failed %d\n", ret);
-			goto out;
+			break;
 		}
 
+		written += thislen;
+
 		if (written == len)
 			break;
 
+		column = 0;
 		to += thislen;
 		buf += thislen;
 	}
 
-out:
 	/* Deselect and wake up anyone waiting on the device */
 	onenand_release_device(mtd);
 
@@ -1059,6 +1098,8 @@ static int onenand_do_write_oob(struct mtd_info *mtd, loff_t to, size_t len,
 	while (written < len) {
 		int thislen = min_t(int, mtd->oobsize, len - written);
 
+		cond_resched();
+
 		column = to & (mtd->oobsize - 1);
 
 		this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobsize);
@@ -1186,6 +1227,7 @@ static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
 	instr->state = MTD_ERASING;
 
 	while (len) {
+		cond_resched();
 
 		/* Check if we have a bad block, we do not erase bad blocks */
 		if (onenand_block_checkbad(mtd, addr, 0, 0)) {
@@ -1199,10 +1241,7 @@ static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
 		ret = this->wait(mtd, FL_ERASING);
 		/* Check, if it is write protected */
 		if (ret) {
-			if (ret == -EPERM)
-				DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Device is write protected!!!\n");
-			else
-				DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Failed erase, block %d\n", (unsigned) (addr >> this->erase_shift));
+			DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Failed erase, block %d\n", (unsigned) (addr >> this->erase_shift));
 			instr->state = MTD_ERASE_FAILED;
 			instr->fail_addr = addr;
 			goto erase_exit;
@@ -2029,23 +2068,30 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 	init_waitqueue_head(&this->wq);
 	spin_lock_init(&this->chip_lock);
 
+	/*
+	 * Allow subpage writes up to oobsize.
+	 */
 	switch (mtd->oobsize) {
 	case 64:
 		this->ecclayout = &onenand_oob_64;
+		mtd->subpage_sft = 2;
 		break;
 
 	case 32:
 		this->ecclayout = &onenand_oob_32;
+		mtd->subpage_sft = 1;
 		break;
 
 	default:
 		printk(KERN_WARNING "No OOB scheme defined for oobsize %d\n",
 			mtd->oobsize);
+		mtd->subpage_sft = 0;
 		/* To prevent kernel oops */
 		this->ecclayout = &onenand_oob_32;
 		break;
 	}
 
+	this->subpagesize = mtd->writesize >> mtd->subpage_sft;
 	mtd->ecclayout = this->ecclayout;
 
 	/* Fill in remaining MTD driver data */
diff --git a/drivers/mtd/onenand/onenand_bbt.c b/drivers/mtd/onenand/onenand_bbt.c
index 6cceeca..98f8fd1 100644
--- a/drivers/mtd/onenand/onenand_bbt.c
+++ b/drivers/mtd/onenand/onenand_bbt.c
@@ -93,7 +93,8 @@ static int create_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
 			ret = onenand_do_read_oob(mtd, from + j * mtd->writesize + bd->offs,
 						  readlen, &retlen, &buf[0]);
 
-			if (ret)
+			/* If it is a initial bad block, just ignore it */
+			if (ret && !(ret & ONENAND_CTRL_LOAD))
 				return ret;
 
 			if (check_short_pattern(&buf[j * scanlen], scanlen, mtd->writesize, bd)) {
diff --git a/include/linux/mtd/onenand.h b/include/linux/mtd/onenand.h
index 62ca0f4..f775a7a 100644
--- a/include/linux/mtd/onenand.h
+++ b/include/linux/mtd/onenand.h
@@ -88,6 +88,7 @@ struct onenand_bufferram {
  *			operation is in progress
  * @state:		[INTERN] the current state of the OneNAND device
  * @page_buf:		data buffer
+ * @subpagesize:	[INTERN] holds the subpagesize
  * @ecclayout:		[REPLACEABLE] the default ecc placement scheme
  * @bbm:		[REPLACEABLE] pointer to Bad Block Management
  * @priv:		[OPTIONAL] pointer to private chip date
@@ -128,6 +129,7 @@ struct onenand_chip {
 	onenand_state_t		state;
 	unsigned char		*page_buf;
 
+	int			subpagesize;
 	struct nand_ecclayout	*ecclayout;
 
 	void			*bbm;
@@ -141,6 +143,7 @@ struct onenand_chip {
 #define ONENAND_CURRENT_BUFFERRAM(this)		(this->bufferram_index)
 #define ONENAND_NEXT_BUFFERRAM(this)		(this->bufferram_index ^ 1)
 #define ONENAND_SET_NEXT_BUFFERRAM(this)	(this->bufferram_index ^= 1)
+#define ONENAND_SET_PREV_BUFFERRAM(this)	(this->bufferram_index ^= 1)
 
 #define ONENAND_GET_SYS_CFG1(this)					\
 	(this->read_word(this->base + ONENAND_REG_SYS_CFG1))