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mtd: spi-nor: Parse SFDP SCCR Map

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Parse SCCR 22nd dword and check DTR Octal Mode Enable
Volatile bit for Octal DTR enable

Signed-off-by: JaimeLiao <jaimeliao.tw@gmail.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
This commit is contained in:
JaimeLiao 2022-07-04 14:12:41 +08:00 committed by Jagan Teki
parent 68ad73b70c
commit bebdc23750
2 changed files with 53 additions and 0 deletions
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52
drivers/mtd/spi/spi-nor-core.c
View file

@ -65,6 +65,10 @@ struct sfdp_parameter_header {
#define SFDP_SECTOR_MAP_ID 0xff81 /* Sector Map Table */
#define SFDP_SST_ID 0x01bf /* Manufacturer specific Table */
#define SFDP_PROFILE1_ID 0xff05 /* xSPI Profile 1.0 Table */
#define SFDP_SCCR_MAP_ID 0xff87 /*
* Status, Control and Configuration
* Register Map.
*/
#define SFDP_SIGNATURE 0x50444653U
#define SFDP_JESD216_MAJOR 1
@ -174,6 +178,9 @@ struct sfdp_header {
#define PROFILE1_DWORD5_DUMMY_100MHZ GENMASK(11, 7)
#define PROFILE1_DUMMY_DEFAULT 20
/* Status, Control and Configuration Register Map(SCCR) */
#define SCCR_DWORD22_OCTAL_DTR_EN_VOLATILE BIT(31)
struct sfdp_bfpt {
u32 dwords[BFPT_DWORD_MAX];
};
@ -2456,6 +2463,44 @@ out:
return ret;
}
/**
* spi_nor_parse_sccr() - Parse the Status, Control and Configuration Register
* Map.
* @nor: pointer to a 'struct spi_nor'
* @sccr_header: pointer to the 'struct sfdp_parameter_header' describing
* the SCCR Map table length and version.
*
* Return: 0 on success, -errno otherwise.
*/
static int spi_nor_parse_sccr(struct spi_nor *nor,
const struct sfdp_parameter_header *sccr_header)
{
u32 *table, addr;
size_t len;
int ret, i;
len = sccr_header->length * sizeof(*table);
table = kmalloc(len, GFP_KERNEL);
if (!table)
return -ENOMEM;
addr = SFDP_PARAM_HEADER_PTP(sccr_header);
ret = spi_nor_read_sfdp(nor, addr, len, table);
if (ret)
goto out;
/* Fix endianness of the table DWORDs. */
for (i = 0; i < sccr_header->length; i++)
table[i] = le32_to_cpu(table[i]);
if (FIELD_GET(SCCR_DWORD22_OCTAL_DTR_EN_VOLATILE, table[22]))
nor->flags |= SNOR_F_IO_MODE_EN_VOLATILE;
out:
kfree(table);
return ret;
}
/**
* spi_nor_parse_sfdp() - parse the Serial Flash Discoverable Parameters.
* @nor: pointer to a 'struct spi_nor'
@ -2562,6 +2607,10 @@ static int spi_nor_parse_sfdp(struct spi_nor *nor,
err = spi_nor_parse_profile1(nor, param_header, params);
break;
case SFDP_SCCR_MAP_ID:
err = spi_nor_parse_sccr(nor, param_header);
break;
default:
break;
}
@ -3620,6 +3669,9 @@ static int spi_nor_octal_dtr_enable(struct spi_nor *nor)
nor->write_proto == SNOR_PROTO_8_8_8_DTR))
return 0;
if (!(nor->flags & SNOR_F_IO_MODE_EN_VOLATILE))
return 0;
ret = nor->octal_dtr_enable(nor);
if (ret)
return ret;

1
include/linux/mtd/spi-nor.h
View file

@ -290,6 +290,7 @@ enum spi_nor_option_flags {
SNOR_F_USE_CLSR = BIT(5),
SNOR_F_BROKEN_RESET = BIT(6),
SNOR_F_SOFT_RESET = BIT(7),
SNOR_F_IO_MODE_EN_VOLATILE = BIT(8),
};
struct spi_nor;