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[PATCH v4 12/23] mtd: nand: denali: fix NAND_CMD_STATUS handling

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  [PATCH v4 12/23] mtd: nand: denali: fix NAND_CMD_STATUS handling Masahiro Yamada <yamada.masahiro@socionext.com> - 2017-06-06 01:30 +0200

#1658227 — [PATCH v4 12/23] mtd: nand: denali: fix NAND_CMD_STATUS handling

The current NAND_CMD_STATUS handling is weird; it just reads the
WRITE_PROTECT register, and returns NAND_STATUS_WP if it is set.

It does not send Read Status (0x70) command, so it is not helpful
for checking the current device status.

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 | 21 +++++----------------
 1 file changed, 5 insertions(+), 16 deletions(-)

diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index e8e6667..372c871 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -107,21 +107,6 @@ static void write_byte_to_buf(struct denali_nand_info *denali, uint8_t byte)
 	denali->buf.buf[denali->buf.tail++] = byte;
 }
 
-/* reads the status of the device */
-static void read_status(struct denali_nand_info *denali)
-{
-	uint32_t cmd;
-
-	/* initialize the data buffer to store status */
-	reset_buf(denali);
-
-	cmd = ioread32(denali->flash_reg + WRITE_PROTECT);
-	if (cmd)
-		write_byte_to_buf(denali, NAND_STATUS_WP);
-	else
-		write_byte_to_buf(denali, 0);
-}
-
 /* Reset the flash controller */
 static uint16_t denali_nand_reset(struct denali_nand_info *denali)
 {
@@ -893,7 +878,11 @@ static void denali_cmdfunc(struct mtd_info *mtd, unsigned int cmd, int col,
 
 	switch (cmd) {
 	case NAND_CMD_STATUS:
-		read_status(denali);
+		reset_buf(denali);
+		addr = MODE_11 | BANK(denali->flash_bank);
+		index_addr(denali, addr | 0, cmd);
+		index_addr_read_data(denali, addr | 2, &id);
+		write_byte_to_buf(denali, id);
 		break;
 	case NAND_CMD_READID:
 	case NAND_CMD_PARAM:
-- 
2.7.4

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