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mtd: spi-nor: Parse SFDP SCCR Map

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Parse just the 22nd dword and look for the 'DTR Octal Mode Enable
Volatile bit'.

SPI_NOR_IO_MODE_EN_VOLATILE should be set just for the flashes
that don't define the optional SFDP SCCR Map. For the others,
let the SFDP do its job and fill the SNOR_F_IO_MODE_EN_VOLATILE
flag. We avoid this way polluting the flash flags when declaring
one.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/20201005153138.6437-10-p.yadav@ti.com
This commit is contained in:
Tudor Ambarus 2020-10-05 21:01:32 +05:30 committed by Vignesh Raghavendra
parent c6908077b1
commit 981a8d60e0
1 changed files with 48 additions and 0 deletions
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48
drivers/mtd/spi-nor/sfdp.c
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@ -21,6 +21,10 @@
#define SFDP_SECTOR_MAP_ID 0xff81 /* Sector Map Table */
#define SFDP_4BAIT_ID 0xff84 /* 4-byte Address Instruction 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
@ -1195,6 +1199,46 @@ out:
return ret;
}
#define SCCR_DWORD22_OCTAL_DTR_EN_VOLATILE BIT(31)
/**
* 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.
* @params: pointer to the 'struct spi_nor_flash_parameter' to be.
*
* Return: 0 on success, -errno otherwise.
*/
static int spi_nor_parse_sccr(struct spi_nor *nor,
const struct sfdp_parameter_header *sccr_header,
struct spi_nor_flash_parameter *params)
{
u32 *dwords, addr;
size_t len;
int ret;
len = sccr_header->length * sizeof(*dwords);
dwords = kmalloc(len, GFP_KERNEL);
if (!dwords)
return -ENOMEM;
addr = SFDP_PARAM_HEADER_PTP(sccr_header);
ret = spi_nor_read_sfdp(nor, addr, len, dwords);
if (ret)
goto out;
le32_to_cpu_array(dwords, sccr_header->length);
if (FIELD_GET(SCCR_DWORD22_OCTAL_DTR_EN_VOLATILE, dwords[22]))
nor->flags |= SNOR_F_IO_MODE_EN_VOLATILE;
out:
kfree(dwords);
return ret;
}
/**
* spi_nor_parse_sfdp() - parse the Serial Flash Discoverable Parameters.
* @nor: pointer to a 'struct spi_nor'
@ -1300,6 +1344,10 @@ 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, params);
break;
default:
break;
}