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authorKyungmin Park <kyungmin.park@samsung.com>2005-09-29 04:53:16 +0100
committerThomas Gleixner <tglx@mtd.linutronix.de>2005-11-06 22:59:48 +0100
commit83a368380e172c1b2e9fd6ec2a62e457684adf0c (patch)
treedd5150d734a383ac042b02f7447f22a46f46a28c /drivers
parenta41371eb6d9b368e53867cd85156f07371e9f72f (diff)
[MTD] OneNAND: Enhanced support for DDP (Dual Densitiy Packages)
Add density mask for better support of DDP chips. Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/mtd/onenand/onenand_base.c39
1 files changed, 18 insertions, 21 deletions
diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index a002d4025b2..99de2f055eb 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -84,25 +84,23 @@ static void onenand_writew(unsigned short value, void __iomem *addr)
/**
* onenand_block_address - [DEFAULT] Get block address
- * @param device the device id
+ * @param this onenand chip data structure
* @param block the block
* @return translated block address if DDP, otherwise same
*
* Setup Start Address 1 Register (F100h)
*/
-static int onenand_block_address(int device, int block)
+static int onenand_block_address(struct onenand_chip *this, int block)
{
- if (device & ONENAND_DEVICE_IS_DDP) {
+ if (this->device_id & ONENAND_DEVICE_IS_DDP) {
/* Device Flash Core select, NAND Flash Block Address */
- int dfs = 0, density, mask;
+ int dfs = 0;
- density = device >> ONENAND_DEVICE_DENSITY_SHIFT;
- mask = (1 << (density + 6));
-
- if (block & mask)
+ if (block & this->density_mask)
dfs = 1;
- return (dfs << ONENAND_DDP_SHIFT) | (block & (mask - 1));
+ return (dfs << ONENAND_DDP_SHIFT) |
+ (block & (this->density_mask - 1));
}
return block;
@@ -110,22 +108,19 @@ static int onenand_block_address(int device, int block)
/**
* onenand_bufferram_address - [DEFAULT] Get bufferram address
- * @param device the device id
+ * @param this onenand chip data structure
* @param block the block
* @return set DBS value if DDP, otherwise 0
*
* Setup Start Address 2 Register (F101h) for DDP
*/
-static int onenand_bufferram_address(int device, int block)
+static int onenand_bufferram_address(struct onenand_chip *this, int block)
{
- if (device & ONENAND_DEVICE_IS_DDP) {
+ if (this->device_id & ONENAND_DEVICE_IS_DDP) {
/* Device BufferRAM Select */
- int dbs = 0, density, mask;
-
- density = device >> ONENAND_DEVICE_DENSITY_SHIFT;
- mask = (1 << (density + 6));
+ int dbs = 0;
- if (block & mask)
+ if (block & this->density_mask)
dbs = 1;
return (dbs << ONENAND_DDP_SHIFT);
@@ -223,7 +218,7 @@ static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t le
/* NOTE: The setting order of the registers is very important! */
if (cmd == ONENAND_CMD_BUFFERRAM) {
/* Select DataRAM for DDP */
- value = onenand_bufferram_address(this->device_id, block);
+ value = onenand_bufferram_address(this, block);
this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
/* Switch to the next data buffer */
@@ -234,7 +229,7 @@ static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t le
if (block != -1) {
/* Write 'DFS, FBA' of Flash */
- value = onenand_block_address(this->device_id, block);
+ value = onenand_block_address(this, block);
this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
}
@@ -263,7 +258,7 @@ static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t le
if (readcmd) {
/* Select DataRAM for DDP */
- value = onenand_bufferram_address(this->device_id, block);
+ value = onenand_bufferram_address(this, block);
this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
}
}
@@ -1313,7 +1308,7 @@ static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
continue;
/* Set block address for read block status */
- value = onenand_block_address(this->device_id, block);
+ value = onenand_block_address(this, block);
this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
/* Check lock status */
@@ -1415,6 +1410,8 @@ static int onenand_probe(struct mtd_info *mtd)
density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
this->chipsize = (16 << density) << 20;
+ /* Set density mask. it is used for DDP */
+ this->density_mask = (1 << (density + 6));
/* OneNAND page size & block size */
/* The data buffer size is equal to page size */