lkml.org 
[lkml]   [2017]   [Jun]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v4 12/23] mtd: nand: denali: fix NAND_CMD_STATUS handling
Date
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
\
 
 \ /
  Last update: 2017-06-12 00:36    [W:0.140 / U:29.984 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site