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ipq6018: Adding support for new read id command sequence for spi nand

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Some spi nand flash uses single byte read id(9FH) command,
for those devices the sequence is
byte1	byte2	byte3	byte4
9FH	MID	DID	DID
some other spi nand flashes uses two byte read id(9F 00H) command
for those devices the sequence is
byte1	byte2	byte3	byte4
9FH	A7-A0	MID	DID
The first byte is the actual command and the second byte is a dummy byte.
For devices which uses new sequence, we need to pass
appropriate read id command with dummy byte.

Change-Id: Idf2e8740f8341596cd8f58d22d5e33a4b4972a31
Signed-off-by: Antony Arun T <antothom@codeaurora.org>
This commit is contained in:
Antony Arun T 2018-12-06 11:57:00 +05:30
parent 51eda13d9c
commit fc4ec308a0
2 changed files with 24 additions and 0 deletions
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23
drivers/mtd/spi/spi_flash.c
View file

@ -1040,9 +1040,20 @@ int spi_flash_scan(struct spi_flash *flash)
u8 idcode[5];
u8 cmd;
int ret;
#ifdef CONFIG_SPI_NAND_MULTI_BYTE_READ_ID
u8 command[2];
int dummy_byte = 0;
command[0] = CMD_READ_ID;
command[1] = 0; /*dummy byte*/
try_with_dummy_byte:
/* Read the ID codes */
ret = spi_flash_cmd_read(spi, command, dummy_byte+1, idcode,
sizeof(idcode));
#else
ret = spi_flash_cmd(spi, CMD_READ_ID, idcode, sizeof(idcode));
#endif
if (ret) {
printf("SF: Failed to get idcodes\n");
return -EINVAL;
@ -1084,10 +1095,22 @@ int spi_flash_scan(struct spi_flash *flash)
if (!ret)
goto do_generic_probe;
#endif
#ifdef CONFIG_SPI_NAND_MULTI_BYTE_READ_ID
if (dummy_byte == 0) {
dummy_byte = 1;
goto try_with_dummy_byte;
} else {
printf("SF: Unsupported flash IDs: ");
printf("manuf %02x, jedec %04x, ext_jedec %04x\n",
idcode[0], jedec, ext_jedec);
return -EPROTONOSUPPORT;
}
#else
printf("SF: Unsupported flash IDs: ");
printf("manuf %02x, jedec %04x, ext_jedec %04x\n",
idcode[0], jedec, ext_jedec);
return -EPROTONOSUPPORT;
#endif
}
/* Flash powers up read-only, so clear BP# bits */

1
include/configs/ipq6018.h
View file

@ -212,6 +212,7 @@ extern loff_t board_env_size;
#define CONFIG_SF_SPI_NAND_CS 1
#define CONFIG_IPQ_SPI_NAND_INFO_IDX 1
#define CONFIG_SF_NAND_BUS 1
#define CONFIG_SPI_NAND_MULTI_BYTE_READ_ID
#endif
/*