[PATCH v5 13/23] mtd: nand: denali: switch over to cmd_ctrl instead of cmdfunc

Masahiro Yamada
2017-06-07T11:54:05Z

The NAND_CMD_SET_FEATURES support is missing from denali_cmdfunc().
This is needed for nand_onfi_set_features().

Besides, we see /* TODO: Read OOB data */ comment line.

It would be possible to add more commands along with the current
implementation, but having ->cmd_ctrl() seems a better approach from
the discussion with Boris [1].

Rely on the default ->cmdfunc() from the framework and implement the
driver's own ->cmd_ctrl().

Also add ->write_byte(), which is needed for write direction commands.

[1] https://lkml.org/lkml/2017/3/15/97

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 | 104 +++++++++++++++++++++++-----------------------
1 file changed, 52 insertions(+), 52 deletions(-)

diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index c3382954cf27..95bce6b341d7 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -230,20 +230,16 @@ static uint32_t denali_wait_for_irq(struct denali_nand_info *denali,
return denali->irq_status;
}

-/* resets a specific device connected to the core */
-static void reset_bank(struct denali_nand_info *denali)
+static uint32_t denali_check_irq(struct denali_nand_info *denali)
{
+ unsigned long flags;
uint32_t irq_status;

- denali_reset_irq(denali);
-
- iowrite32(1 << denali->flash_bank, denali->flash_reg + DEVICE_RESET);
-
- irq_status = denali_wait_for_irq(denali,
- INTR__RST_COMP | INTR__TIME_OUT);
+ spin_lock_irqsave(&denali->irq_lock, flags);
+ irq_status = denali->irq_status;
+ spin_unlock_irqrestore(&denali->irq_lock, flags);

- if (!(irq_status & INTR__RST_COMP))
- dev_err(denali->dev, "reset bank failed.\n");
+ return irq_status;
}

/*
@@ -273,6 +269,42 @@ static uint8_t denali_read_byte(struct mtd_info *mtd)
return ioread32(denali->flash_mem + 0x10);
}

+static void denali_write_byte(struct mtd_info *mtd, uint8_t byte)
+{
+ struct denali_nand_info *denali = mtd_to_denali(mtd);
+
+ index_addr(denali, MODE_11 | BANK(denali->flash_bank) | 2, byte);
+}
+
+static void denali_cmd_ctrl(struct mtd_info *mtd, int dat, unsigned int ctrl)
+{
+ struct denali_nand_info *denali = mtd_to_denali(mtd);
+ uint32_t type;
+
+ if (ctrl & NAND_CLE)
+ type = 0;
+ else if (ctrl & NAND_ALE)
+ type = 1;
+ else
+ return;
+
+ /*
+ * Some commands are followed by chip->dev_ready or chip->waitfunc.
+ * irq_status must be cleared here to catch the R/B# interrupt later.
+ */
+ if (ctrl & NAND_CTRL_CHANGE)
+ denali_reset_irq(denali);
+
+ index_addr(denali, MODE_11 | BANK(denali->flash_bank) | type, dat);
+}
+
+static int denali_dev_ready(struct mtd_info *mtd)
+{
+ struct denali_nand_info *denali = mtd_to_denali(mtd);
+
+ return !!(denali_check_irq(denali) & INTR__INT_ACT);
+}
+
/*
* sends a pipeline command operation to the controller. See the Denali NAND
* controller's user guide for more information (section 4.2.3.6).
@@ -824,7 +856,13 @@ static void denali_select_chip(struct mtd_info *mtd, int chip)

static int denali_waitfunc(struct mtd_info *mtd, struct nand_chip *chip)
{
- return 0;
+ struct denali_nand_info *denali = mtd_to_denali(mtd);
+ uint32_t irq_status;
+
+ /* R/B# pin transitioned from low to high? */
+ irq_status = denali_wait_for_irq(denali, INTR__INT_ACT);
+
+ return irq_status & INTR__INT_ACT ? 0 : NAND_STATUS_FAIL;
}

static int denali_erase(struct mtd_info *mtd, int page)
@@ -845,46 +883,6 @@ static int denali_erase(struct mtd_info *mtd, int page)
return irq_status & INTR__ERASE_COMP ? 0 : NAND_STATUS_FAIL;
}

-static void denali_cmdfunc(struct mtd_info *mtd, unsigned int cmd, int col,
- int page)
-{
- struct denali_nand_info *denali = mtd_to_denali(mtd);
- uint32_t addr, irq_status;
- int wait_ready = 0;
-
- switch (cmd) {
- case NAND_CMD_PARAM:
- wait_ready = 1;
- break;
- case NAND_CMD_STATUS:
- case NAND_CMD_READID:
- break;
- case NAND_CMD_RESET:
- reset_bank(denali);
- break;
- case NAND_CMD_READOOB:
- /* TODO: Read OOB data */
- return;
- default:
- pr_err(": unsupported command received 0x%x\n", cmd);
- return;
- }
-
- denali_reset_irq(denali);
-
- addr = MODE_11 | BANK(denali->flash_bank);
- index_addr(denali, addr | 0, cmd);
- if (col != -1)
- index_addr(denali, addr | 1, col);
-
- if (!wait_ready)
- return;
-
- irq_status = denali_wait_for_irq(denali, INTR__INT_ACT);
- if (!(irq_status & INTR__INT_ACT))
- dev_err(denali->dev, "failed to issue command 0x%x\n", cmd);
-}
-
#define DIV_ROUND_DOWN_ULL(ll, d) \
({ unsigned long long _tmp = (ll); do_div(_tmp, d); _tmp; })

@@ -1224,8 +1222,10 @@ int denali_init(struct denali_nand_info *denali)

/* register the driver with the NAND core subsystem */
chip->select_chip = denali_select_chip;
- chip->cmdfunc = denali_cmdfunc;
chip->read_byte = denali_read_byte;
+ chip->write_byte = denali_write_byte;
+ chip->cmd_ctrl = denali_cmd_ctrl;
+ chip->dev_ready = denali_dev_ready;
chip->waitfunc = denali_waitfunc;
/* clk rate info is needed for setup_data_interface */
if (denali->clk_x_rate)
--
2.7.4