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Subject[PATCH v4 07/23] mtd: nand: denali: set NAND_ECC_CUSTOM_PAGE_ACCESS
Date
The denali_cmdfunc() actually does nothing valuable for
NAND_CMD_{PAGEPROG,READ0,SEQIN}.

For NAND_CMD_{READ0,SEQIN}, it copies "page" to "denali->page", then
denali_read_page() and denali_read_page_raw() compare them to check
if the NAND framework called the callbacks in correct order.
(Inconsistently, this check is missing from the denali_write_page()
and denali_write_page_raw().)

The framework is widely tested by many drivers, so this kind of
sanity check is unneeded. The Denali controller is equipped with
high level interface for read/write, so let's skip unneeded call
of cmdfunc().

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

Changes in v4: None
Changes in v3: None
Changes in v2:
- Newly added

drivers/mtd/nand/denali.c | 29 ++++++++---------------------
1 file changed, 8 insertions(+), 21 deletions(-)

diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index 422b6e4..3655284 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -998,7 +998,7 @@ static void denali_setup_dma(struct denali_nand_info *denali, int op)
* configuration details.
*/
static int write_page(struct mtd_info *mtd, struct nand_chip *chip,
- const uint8_t *buf, bool raw_xfer)
+ const uint8_t *buf, int page, bool raw_xfer)
{
struct denali_nand_info *denali = mtd_to_denali(mtd);
dma_addr_t addr = denali->buf.dma_buf;
@@ -1006,6 +1006,8 @@ static int write_page(struct mtd_info *mtd, struct nand_chip *chip,
uint32_t irq_status;
uint32_t irq_mask = INTR__DMA_CMD_COMP | INTR__PROGRAM_FAIL;

+ denali->page = page;
+
/*
* if it is a raw xfer, we want to disable ecc and send the spare area.
* !raw_xfer - enable ecc
@@ -1059,7 +1061,7 @@ static int denali_write_page(struct mtd_info *mtd, struct nand_chip *chip,
* for regular page writes, we let HW handle all the ECC
* data written to the device.
*/
- return write_page(mtd, chip, buf, false);
+ return write_page(mtd, chip, buf, page, false);
}

/*
@@ -1075,7 +1077,7 @@ static int denali_write_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
* for raw page writes, we want to disable ECC and simply write
* whatever data is in the buffer.
*/
- return write_page(mtd, chip, buf, true);
+ return write_page(mtd, chip, buf, page, true);
}

static int denali_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
@@ -1105,12 +1107,7 @@ static int denali_read_page(struct mtd_info *mtd, struct nand_chip *chip,
unsigned long uncor_ecc_flags = 0;
int stat = 0;

- if (page != denali->page) {
- dev_err(denali->dev,
- "IN %s: page %d is not equal to denali->page %d",
- __func__, page, denali->page);
- BUG();
- }
+ denali->page = page;

setup_ecc_for_xfer(denali, true, false);

@@ -1154,12 +1151,7 @@ static int denali_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
size_t size = mtd->writesize + mtd->oobsize;
uint32_t irq_mask = INTR__DMA_CMD_COMP;

- if (page != denali->page) {
- dev_err(denali->dev,
- "IN %s: page %d is not equal to denali->page %d",
- __func__, page, denali->page);
- BUG();
- }
+ denali->page = page;

setup_ecc_for_xfer(denali, false, true);
denali_enable_dma(denali, true);
@@ -1238,8 +1230,6 @@ static void denali_cmdfunc(struct mtd_info *mtd, unsigned int cmd, int col,
int i;

switch (cmd) {
- case NAND_CMD_PAGEPROG:
- break;
case NAND_CMD_STATUS:
read_status(denali);
break;
@@ -1259,10 +1249,6 @@ static void denali_cmdfunc(struct mtd_info *mtd, unsigned int cmd, int col,
write_byte_to_buf(denali, id);
}
break;
- case NAND_CMD_READ0:
- case NAND_CMD_SEQIN:
- denali->page = page;
- break;
case NAND_CMD_RESET:
reset_bank(denali);
break;
@@ -1619,6 +1605,7 @@ int denali_init(struct denali_nand_info *denali)

mtd_set_ooblayout(mtd, &denali_ooblayout_ops);

+ chip->ecc.options |= NAND_ECC_CUSTOM_PAGE_ACCESS;
chip->ecc.read_page = denali_read_page;
chip->ecc.read_page_raw = denali_read_page_raw;
chip->ecc.write_page = denali_write_page;
--
2.7.4
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