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[MTD] OneNAND: Reduce Double Density Package (DDP) operations 

- DDP code clean-up
- Reduce block & bufferram operations in DDP

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
This commit is contained in:
Kyungmin Park 2007-01-15 17:09:14 +09:00
parent 9d03280129
commit 738d61f537
3 changed files with 22 additions and 27 deletions
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42
drivers/mtd/onenand/onenand_base.c
View File

@ -94,16 +94,9 @@ static void onenand_writew(unsigned short value, void __iomem *addr)
*/
static int onenand_block_address(struct onenand_chip *this, int block)
{
if (this->device_id & ONENAND_DEVICE_IS_DDP) {
/* Device Flash Core select, NAND Flash Block Address */
int dfs = 0;
if (block & this->density_mask)
dfs = 1;
return (dfs << ONENAND_DDP_SHIFT) |
(block & (this->density_mask - 1));
}
/* Device Flash Core select, NAND Flash Block Address */
if (block & this->density_mask)
return ONENAND_DDP_CHIP1 | (block ^ this->density_mask);
return block;
}
@ -118,17 +111,11 @@ static int onenand_block_address(struct onenand_chip *this, int block)
*/
static int onenand_bufferram_address(struct onenand_chip *this, int block)
{
if (this->device_id & ONENAND_DEVICE_IS_DDP) {
/* Device BufferRAM Select */
int dbs = 0;
/* Device BufferRAM Select */
if (block & this->density_mask)
return ONENAND_DDP_CHIP1;
if (block & this->density_mask)
dbs = 1;
return (dbs << ONENAND_DDP_SHIFT);
}
return 0;
return ONENAND_DDP_CHIP0;
}
/**
@ -757,9 +744,9 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
* 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);
if (ONENAND_IS_DDP(this) &&
unlikely(from == (this->chipsize >> 1))) {
this->write_word(ONENAND_DDP_CHIP0, this->base + ONENAND_REG_START_ADDRESS2);
boundary = 1;
} else
boundary = 0;
@ -773,7 +760,7 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
break;
/* Set up for next read from bufferRAM */
if (unlikely(boundary))
this->write_word(0x8000, this->base + ONENAND_REG_START_ADDRESS2);
this->write_word(ONENAND_DDP_CHIP1, this->base + ONENAND_REG_START_ADDRESS2);
ONENAND_SET_NEXT_BUFFERRAM(this);
buf += thislen;
thislen = min_t(int, mtd->writesize, len - read);
@ -1508,7 +1495,7 @@ static int onenand_unlock_all(struct mtd_info *mtd)
continue;
/* Workaround for all block unlock in DDP */
if (this->device_id & ONENAND_DEVICE_IS_DDP) {
if (ONENAND_IS_DDP(this)) {
/* 1st block on another chip */
loff_t ofs = this->chipsize >> 1;
size_t len = mtd->erasesize;
@ -1963,7 +1950,10 @@ 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));
if (ONENAND_IS_DDP(this))
this->density_mask = (1 << (density + 6));
else
this->density_mask = 0;
/* OneNAND page size & block size */
/* The data buffer size is equal to page size */

3
include/linux/mtd/onenand.h
View File

@ -150,6 +150,9 @@ struct onenand_chip {
#define ONENAND_SET_SYS_CFG1(v, this) \
(this->write_word(v, this->base + ONENAND_REG_SYS_CFG1))
#define ONENAND_IS_DDP(this) \
(this->device_id & ONENAND_DEVICE_IS_DDP)
/* Check byte access in OneNAND */
#define ONENAND_CHECK_BYTE_ACCESS(addr) (addr & 0x1)

4
include/linux/mtd/onenand_regs.h
View File

@ -80,9 +80,11 @@
#define ONENAND_VERSION_PROCESS_SHIFT (8)
/*
* Start Address 1 F100h (R/W)
* Start Address 1 F100h (R/W) & Start Address 2 F101h (R/W)
*/
#define ONENAND_DDP_SHIFT (15)
#define ONENAND_DDP_CHIP0 (0)
#define ONENAND_DDP_CHIP1 (1 << ONENAND_DDP_SHIFT)
/*
* Start Address 8 F107h (R/W)