1 files changed, 96 insertions, 49 deletions

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 529af271db17..30d6999e5f9f 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -1455,7 +1455,8 @@ static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to,
                                 struct mtd_oob_ops *ops)
 {
         struct onenand_chip *this = mtd->priv;
-        int written = 0, column, thislen, subpage;
+        int written = 0, column, thislen = 0, subpage = 0;
+        int prev = 0, prevlen = 0, prev_subpage = 0, first = 1;
         int oobwritten = 0, oobcolumn, thisooblen, oobsize;
         size_t len = ops->len;
         size_t ooblen = ops->ooblen;
@@ -1482,6 +1483,10 @@ static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to,
                 return -EINVAL;
         }
 
+        /* Check zero length */
+        if (!len)
+                return 0;
+
         if (ops->mode == MTD_OOB_AUTO)
                 oobsize = this->ecclayout->oobavail;
         else
@@ -1492,79 +1497,121 @@ static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to,
         column = to & (mtd->writesize - 1);
 
         /* Loop until all data write */
-        while (written < len) {
-                u_char *wbuf = (u_char *) buf;
+        while (1) {
+                if (written < len) {
+                        u_char *wbuf = (u_char *) buf;
 
-                thislen = min_t(int, mtd->writesize - column, len - written);
-                thisooblen = min_t(int, oobsize - oobcolumn, ooblen - oobwritten);
+                        thislen = min_t(int, mtd->writesize - column, len - written);
+                        thisooblen = min_t(int, oobsize - oobcolumn, ooblen - oobwritten);
 
-                cond_resched();
+                        cond_resched();
 
-                this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);
+                        this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);
 
-                /* Partial page write */
-                subpage = thislen < mtd->writesize;
-                if (subpage) {
-                        memset(this->page_buf, 0xff, mtd->writesize);
-                        memcpy(this->page_buf + column, buf, thislen);
-                        wbuf = this->page_buf;
-                }
+                        /* Partial page write */
+                        subpage = thislen < mtd->writesize;
+                        if (subpage) {
+                                memset(this->page_buf, 0xff, mtd->writesize);
+                                memcpy(this->page_buf + column, buf, thislen);
+                                wbuf = this->page_buf;
+                        }
 
-                this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize);
+                        this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize);
 
-                if (oob) {
-                        oobbuf = this->oob_buf;
+                        if (oob) {
+                                oobbuf = this->oob_buf;
 
-                        /* We send data to spare ram with oobsize
-                         * to prevent byte access */
-                        memset(oobbuf, 0xff, mtd->oobsize);
-                        if (ops->mode == MTD_OOB_AUTO)
-                                onenand_fill_auto_oob(mtd, oobbuf, oob, oobcolumn, thisooblen);
-                        else
-                                memcpy(oobbuf + oobcolumn, oob, thisooblen);
+                                /* We send data to spare ram with oobsize
+                                 * to prevent byte access */
+                                memset(oobbuf, 0xff, mtd->oobsize);
+                                if (ops->mode == MTD_OOB_AUTO)
+                                        onenand_fill_auto_oob(mtd, oobbuf, oob, oobcolumn, thisooblen);
+                                else
+                                        memcpy(oobbuf + oobcolumn, oob, thisooblen);
 
-                        oobwritten += thisooblen;
-                        oob += thisooblen;
-                        oobcolumn = 0;
+                                oobwritten += thisooblen;
+                                oob += thisooblen;
+                                oobcolumn = 0;
+                        } else
+                                oobbuf = (u_char *) ffchars;
+
+                        this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
                 } else
-                        oobbuf = (u_char *) ffchars;
+                        ONENAND_SET_NEXT_BUFFERRAM(this);
 
-                this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
+                /*
+                 * 2 PLANE, MLC, and Flex-OneNAND doesn't support
+                 * write-while-programe feature.
+                 */
+                if (!ONENAND_IS_2PLANE(this) && !first) {
+                        ONENAND_SET_PREV_BUFFERRAM(this);
 
-                this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
+                        ret = this->wait(mtd, FL_WRITING);
 
-                ret = this->wait(mtd, FL_WRITING);
+                        /* In partial page write we don't update bufferram */
+                        onenand_update_bufferram(mtd, prev, !ret && !prev_subpage);
+                        if (ret) {
+                                written -= prevlen;
+                                printk(KERN_ERR "onenand_write_ops_nolock: write filaed %d\n", ret);
+                                break;
+                        }
 
-                /* In partial page write we don't update bufferram */
-                onenand_update_bufferram(mtd, to, !ret && !subpage);
-                if (ONENAND_IS_2PLANE(this)) {
-                        ONENAND_SET_BUFFERRAM1(this);
-                        onenand_update_bufferram(mtd, to + this->writesize, !ret && !subpage);
-                }
+                        if (written == len) {
+                                /* Only check verify write turn on */
+                                ret = onenand_verify(mtd, buf - len, to - len, len);
+                                if (ret)
+                                        printk(KERN_ERR "onenand_write_ops_nolock: verify failed %d\n", ret);
+                                break;
+                        }
 
-                if (ret) {
-                        printk(KERN_ERR "onenand_write_ops_nolock: write filaed %d\n", ret);
-                        break;
+                        ONENAND_SET_NEXT_BUFFERRAM(this);
                 }
 
-                /* Only check verify write turn on */
-                ret = onenand_verify(mtd, buf, to, thislen);
-                if (ret) {
-                        printk(KERN_ERR "onenand_write_ops_nolock: verify failed %d\n", ret);
-                        break;
-                }
+                this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
 
-                written += thislen;
+                /*
+                 * 2 PLANE, MLC, and Flex-OneNAND wait here
+                 */
+                if (ONENAND_IS_2PLANE(this)) {
+                        ret = this->wait(mtd, FL_WRITING);
 
-                if (written == len)
-                        break;
+                        /* In partial page write we don't update bufferram */
+                        onenand_update_bufferram(mtd, to, !ret && !subpage);
+                        if (ret) {
+                                printk(KERN_ERR "onenand_write_ops_nolock: write filaed %d\n", ret);
+                                break;
+                        }
+
+                        /* Only check verify write turn on */
+                        ret = onenand_verify(mtd, buf, to, thislen);
+                        if (ret) {
+                                printk(KERN_ERR "onenand_write_ops_nolock: verify failed %d\n", ret);
+                                break;
+                        }
+
+                        written += thislen;
+
+                        if (written == len)
+                                break;
+
+                } else
+                        written += thislen;
 
                 column = 0;
+                prev_subpage = subpage;
+                prev = to;
+                prevlen = thislen;
                 to += thislen;
                 buf += thislen;
+                first = 0;
         }
 
+        /* In error case, clear all bufferrams */
+        if (written != len)
+                onenand_invalidate_bufferram(mtd, 0, -1);
+
         ops->retlen = written;
+        ops->oobretlen = oobwritten;
 
         return ret;
 }