[PATCH v5 16/23] mtd: nand: denali: propagate page to helpers via function argument

Masahiro Yamada
2017-06-07T11:54:06Z

This driver stores the currently addressed page into denali->page,
which is later read out by helper functions. While I am tackling on
this driver, I often missed to insert "denali->page = page;" where
needed. This makes page_read/write callbacks to get access to a
wrong page, which is a bug hard to figure out.

Instead, I'd rather pass the page via function argument because the
compiler's prototype checks will help to detect bugs.

For the same reason, propagate dma_addr to the DMA helpers instead
of denali->buf.dma_buf .

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

Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2:
- Newly added

drivers/mtd/nand/denali.c | 58 ++++++++++++++++++++---------------------------
drivers/mtd/nand/denali.h | 1 -
2 files changed, 24 insertions(+), 35 deletions(-)

diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index eda206851a4b..1a96942f62f9 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -282,7 +282,7 @@ static int denali_dev_ready(struct mtd_info *mtd)
* sends a pipeline command operation to the controller. See the Denali NAND
* controller's user guide for more information (section 4.2.3.6).
*/
-static int denali_send_pipeline_cmd(struct denali_nand_info *denali,
+static int denali_send_pipeline_cmd(struct denali_nand_info *denali, int page,
bool ecc_en, bool transfer_spare,
int access_type, int op)
{
@@ -293,7 +293,7 @@ static int denali_send_pipeline_cmd(struct denali_nand_info *denali,

denali_reset_irq(denali);

- addr = BANK(denali->flash_bank) | denali->page;
+ addr = BANK(denali->flash_bank) | page;

if (op == DENALI_WRITE && access_type != SPARE_ACCESS) {
cmd = MODE_01 | addr;
@@ -366,9 +366,7 @@ static int write_oob_data(struct mtd_info *mtd, uint8_t *buf, int page)
uint32_t irq_mask = INTR__PROGRAM_COMP | INTR__PROGRAM_FAIL;
int status = 0;

- denali->page = page;
-
- if (denali_send_pipeline_cmd(denali, false, false, SPARE_ACCESS,
+ if (denali_send_pipeline_cmd(denali, page, false, false, SPARE_ACCESS,
DENALI_WRITE) == PASS) {
write_data_to_flash_mem(denali, buf, mtd->oobsize);

@@ -393,9 +391,7 @@ static void read_oob_data(struct mtd_info *mtd, uint8_t *buf, int page)
uint32_t irq_mask = INTR__LOAD_COMP;
uint32_t irq_status, addr, cmd;

- denali->page = page;
-
- if (denali_send_pipeline_cmd(denali, false, true, SPARE_ACCESS,
+ if (denali_send_pipeline_cmd(denali, page, false, true, SPARE_ACCESS,
DENALI_READ) == PASS) {
read_data_from_flash_mem(denali, buf, mtd->oobsize);

@@ -407,8 +403,7 @@ static void read_oob_data(struct mtd_info *mtd, uint8_t *buf, int page)
irq_status = denali_wait_for_irq(denali, irq_mask);

if (!(irq_status & INTR__LOAD_COMP))
- dev_err(denali->dev, "page on OOB timeout %d\n",
- denali->page);
+ dev_err(denali->dev, "page on OOB timeout %d\n", page);

/*
* We set the device back to MAIN_ACCESS here as I observed
@@ -417,7 +412,7 @@ static void read_oob_data(struct mtd_info *mtd, uint8_t *buf, int page)
* is reliable (according to the MTD test infrastructure)
* if you are in MAIN_ACCESS.
*/
- addr = BANK(denali->flash_bank) | denali->page;
+ addr = BANK(denali->flash_bank) | page;
cmd = MODE_10 | addr;
index_addr(denali, cmd, MAIN_ACCESS);
}
@@ -582,13 +577,13 @@ static void denali_enable_dma(struct denali_nand_info *denali, bool en)
ioread32(denali->flash_reg + DMA_ENABLE);
}

-static void denali_setup_dma64(struct denali_nand_info *denali, int op)
+static void denali_setup_dma64(struct denali_nand_info *denali,
+ dma_addr_t dma_addr, int page, int op)
{
uint32_t mode;
const int page_count = 1;
- uint64_t addr = denali->buf.dma_buf;

- mode = MODE_10 | BANK(denali->flash_bank) | denali->page;
+ mode = MODE_10 | BANK(denali->flash_bank) | page;

/* DMA is a three step process */

@@ -599,41 +594,42 @@ static void denali_setup_dma64(struct denali_nand_info *denali, int op)
index_addr(denali, mode, 0x01002000 | (64 << 16) | op | page_count);

/* 2. set memory low address */
- index_addr(denali, mode, addr);
+ index_addr(denali, mode, dma_addr);

/* 3. set memory high address */
- index_addr(denali, mode, addr >> 32);
+ index_addr(denali, mode, (uint64_t)dma_addr >> 32);
}

-static void denali_setup_dma32(struct denali_nand_info *denali, int op)
+static void denali_setup_dma32(struct denali_nand_info *denali,
+ dma_addr_t dma_addr, int page, int op)
{
uint32_t mode;
const int page_count = 1;
- uint32_t addr = denali->buf.dma_buf;

mode = MODE_10 | BANK(denali->flash_bank);

/* DMA is a four step process */

/* 1. setup transfer type and # of pages */
- index_addr(denali, mode | denali->page, 0x2000 | op | page_count);
+ index_addr(denali, mode | page, 0x2000 | op | page_count);

/* 2. set memory high address bits 23:8 */
- index_addr(denali, mode | ((addr >> 16) << 8), 0x2200);
+ index_addr(denali, mode | ((dma_addr >> 16) << 8), 0x2200);

/* 3. set memory low address bits 23:8 */
- index_addr(denali, mode | ((addr & 0xffff) << 8), 0x2300);
+ index_addr(denali, mode | ((dma_addr & 0xffff) << 8), 0x2300);

/* 4. interrupt when complete, burst len = 64 bytes */
index_addr(denali, mode | 0x14000, 0x2400);
}

-static void denali_setup_dma(struct denali_nand_info *denali, int op)
+static void denali_setup_dma(struct denali_nand_info *denali,
+ dma_addr_t dma_addr, int page, int op)
{
if (denali->caps & DENALI_CAP_DMA_64BIT)
- denali_setup_dma64(denali, op);
+ denali_setup_dma64(denali, dma_addr, page, op);
else
- denali_setup_dma32(denali, op);
+ denali_setup_dma32(denali, dma_addr, page, op);
}

/*
@@ -650,8 +646,6 @@ static int write_page(struct mtd_info *mtd, struct nand_chip *chip,
uint32_t irq_mask = INTR__DMA_CMD_COMP | INTR__PROGRAM_FAIL;
int ret = 0;

- denali->page = page;
-
/*
* if it is a raw xfer, we want to disable ecc and send the spare area.
* !raw_xfer - enable ecc
@@ -674,7 +668,7 @@ static int write_page(struct mtd_info *mtd, struct nand_chip *chip,
denali_reset_irq(denali);
denali_enable_dma(denali, true);

- denali_setup_dma(denali, DENALI_WRITE);
+ denali_setup_dma(denali, addr, page, DENALI_WRITE);

/* wait for operation to complete */
irq_status = denali_wait_for_irq(denali, irq_mask);
@@ -750,15 +744,13 @@ static int denali_read_page(struct mtd_info *mtd, struct nand_chip *chip,
unsigned long uncor_ecc_flags = 0;
int stat = 0;

- denali->page = page;
-
setup_ecc_for_xfer(denali, true, false);

denali_enable_dma(denali, true);
dma_sync_single_for_device(denali->dev, addr, size, DMA_FROM_DEVICE);

denali_reset_irq(denali);
- denali_setup_dma(denali, DENALI_READ);
+ denali_setup_dma(denali, addr, page, DENALI_READ);

/* wait for operation to complete */
irq_status = denali_wait_for_irq(denali, irq_mask);
@@ -777,7 +769,7 @@ static int denali_read_page(struct mtd_info *mtd, struct nand_chip *chip,
return stat;

if (uncor_ecc_flags) {
- read_oob_data(mtd, chip->oob_poi, denali->page);
+ read_oob_data(mtd, chip->oob_poi, page);

stat = denali_check_erased_page(mtd, chip, buf,
uncor_ecc_flags, stat);
@@ -795,15 +787,13 @@ static int denali_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
uint32_t irq_mask = INTR__DMA_CMD_COMP;
uint32_t irq_status;

- denali->page = page;
-
setup_ecc_for_xfer(denali, false, true);
denali_enable_dma(denali, true);

dma_sync_single_for_device(denali->dev, addr, size, DMA_FROM_DEVICE);

denali_reset_irq(denali);
- denali_setup_dma(denali, DENALI_READ);
+ denali_setup_dma(denali, addr, page, DENALI_READ);

/* wait for operation to complete */
irq_status = denali_wait_for_irq(denali, irq_mask);
diff --git a/drivers/mtd/nand/denali.h b/drivers/mtd/nand/denali.h
index a84d8784ee98..ad2223d179d0 100644
--- a/drivers/mtd/nand/denali.h
+++ b/drivers/mtd/nand/denali.h
@@ -316,7 +316,6 @@ struct denali_nand_info {
int flash_bank; /* currently selected chip */
struct nand_buf buf;
struct device *dev;
- int page;
void __iomem *flash_reg; /* Register Interface */
void __iomem *flash_mem; /* Host Data/Command Interface */

--
2.7.4