Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0fc2ccea4c8fa779053cb6f8984f6da399a81182
Commit:     0fc2ccea4c8fa779053cb6f8984f6da399a81182
Parent:     b3c9f8bfe7ab366a5d2495ebe5d2dc6fd7368122
Author:     Adrian Hunter <[EMAIL PROTECTED]>
AuthorDate: Tue Jan 9 17:55:21 2007 +0200
Committer:  Artem Bityutskiy <[EMAIL PROTECTED]>
CommitDate: Wed Jan 10 15:05:22 2007 +0200

    [MTD] OneNAND: Handle DDP chip boundary during read-while-load
    
    The read-while-load method of reading from OneNAND needs to allow
    for the change of bufferRAM address at the boundary between the
    two chips in a double density (DDP) device.
    
    Signed-off-by: Adrian Hunter <[EMAIL PROTECTED]>
    Signed-off-by: Kyungmin Park <[EMAIL PROTECTED]>
---
 drivers/mtd/onenand/onenand_base.c |   15 ++++++++++++++-
 1 files changed, 14 insertions(+), 1 deletions(-)

diff --git a/drivers/mtd/onenand/onenand_base.c 
b/drivers/mtd/onenand/onenand_base.c
index 2ea07f5..2da6bb2 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -710,7 +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);
 
@@ -749,6 +749,17 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, 
size_t len,
                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 */
@@ -758,6 +769,8 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, 
size_t len,
                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);
-
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