[MTD] OneNAND: Invalidate bufferRAM after erase

[Linux-MTD Mailing List]

Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=480b9dfb1fbeb783d4c0061df7868c39af91afec
Commit:     480b9dfb1fbeb783d4c0061df7868c39af91afec
Parent:     678c857f3cffb076c36ce55dfa9fb570712cec12
Author:     Adrian Hunter <ext-adrian.hunter at nokia.com>
AuthorDate: Wed Feb 7 13:55:19 2007 +0200
Committer:  David Woodhouse <dwmw2 at infradead.org>
CommitDate: Fri Feb 9 15:16:55 2007 +0000

    [MTD] OneNAND: Invalidate bufferRAM after erase
    
    OneNAND has internal bufferRAMs.  The driver keeps track of
    what is in the bufferRAM to save having to load from the
    NAND core.  After an erase operation, the driver must
    mark bufferRAM invalid if it refers to the erased block.
    
    Signed-off-by: Adrian Hunter <ext-adrian.hunter at nokia.com>
    Signed-off-by: David Woodhouse <dwmw2 at infradead.org>
---
 drivers/mtd/onenand/onenand_base.c |   25 +++++++++++++++++++++++++
 1 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 779327b..a764579 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -636,6 +636,29 @@ static void onenand_update_bufferram(struct mtd_info *mtd, loff_t addr,
 }
 
 /**
+ * onenand_invalidate_bufferram - [GENERIC] Invalidate BufferRAM information
+ * @param mtd		MTD data structure
+ * @param addr		start address to invalidate
+ * @param len		length to invalidate
+ *
+ * Invalidate BufferRAM information
+ */
+static void onenand_invalidate_bufferram(struct mtd_info *mtd, loff_t addr,
+		unsigned int len)
+{
+	struct onenand_chip *this = mtd->priv;
+	int i;
+	loff_t end_addr = addr + len;
+
+	/* Invalidate BufferRAM */
+	for (i = 0; i < MAX_BUFFERRAM; i++) {
+		loff_t buf_addr = this->bufferram[i].blockpage << this->page_shift;
+		if (buf_addr >= addr && buf_addr < end_addr)
+			this->bufferram[i].blockpage = -1;
+	}
+}
+
+/**
  * onenand_get_device - [GENERIC] Get chip for selected access
  * @param mtd		MTD device structure
  * @param new_state	the state which is requested
@@ -1476,6 +1499,8 @@ static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
 
 		this->command(mtd, ONENAND_CMD_ERASE, addr, block_size);
 
+		onenand_invalidate_bufferram(mtd, addr, block_size);
+
 		ret = this->wait(mtd, FL_ERASING);
 		/* Check, if it is write protected */
 		if (ret) {