From: Tudor Ambarus <tudor.amba...@microchip.com>
JESD216 allow vendors to define their own SFDP tables.
Add Microchip SFDP parser. The vendor table is allocated using
resource-managed kmalloc - the table will be freed on driver detach.
It will be accessible by getting the UCLASS_SPI_FLASH's private data.
The Michrochip's SFDP table is particularly of interest because contains
pre-programmed globally unique EUI-48 and EUI-64 identifiers.
Signed-off-by: Tudor Ambarus <tudor.amba...@microchip.com>
---
drivers/mtd/spi/spi-nor-core.c | 35 +++++++++++++++++++++++++++++++++++
include/linux/mtd/spi-nor.h | 2 ++
2 files changed, 37 insertions(+)
diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c
index 1acff745d1a2..bade7d8a9f79 100644
--- a/drivers/mtd/spi/spi-nor-core.c
+++ b/drivers/mtd/spi/spi-nor-core.c
@@ -1417,6 +1417,7 @@ struct sfdp_parameter_header {
#define SFDP_BFPT_ID 0xff00 /* Basic Flash Parameter Table */
#define SFDP_SECTOR_MAP_ID 0xff81 /* Sector Map Table */
+#define SFDP_MICROCHIP_ID 0x01bf /* Manufacturer specific Table */
#define SFDP_SIGNATURE 0x50444653U
#define SFDP_JESD216_MAJOR 1
@@ -1797,6 +1798,34 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor,
}
/**
+ * spi_nor_parse_microchip_sfdp() - parse the Microchip manufacturer specific
+ * SFDP table.
+ * @nor: pointer to a 'struct spi_nor'.
+ * @param_header: pointer to the SFDP parameter header.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int
+spi_nor_parse_microchip_sfdp(struct spi_nor *nor,
+ const struct sfdp_parameter_header *param_header)
+{
+ size_t size;
+ u32 addr;
+ int ret;
+
+ size = param_header->length * sizeof(u32);
+ addr = SFDP_PARAM_HEADER_PTP(param_header);
+
+ nor->manufacturer_sfdp = devm_kmalloc(nor->dev, size, GFP_KERNEL);
+ if (!nor->manufacturer_sfdp)
+ return -ENOMEM;
+
+ ret = spi_nor_read_sfdp(nor, addr, size, nor->manufacturer_sfdp);
+
+ return ret;
+}
+
+/**
* spi_nor_parse_sfdp() - parse the Serial Flash Discoverable Parameters.
* @nor: pointer to a 'struct spi_nor'
* @params: pointer to the 'struct spi_nor_flash_parameter' to be
@@ -1892,6 +1921,12 @@ static int spi_nor_parse_sfdp(struct spi_nor *nor,
dev_info(dev, "non-uniform erase sector maps are not
supported yet.\n");
break;
+ case SFDP_MICROCHIP_ID:
+ err = spi_nor_parse_microchip_sfdp(nor, param_header);
+ if (err)
+ goto exit;
+ break;
+
default:
break;
}
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index 88e80af57941..836a50178925 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -251,6 +251,7 @@ struct flash_info;
* @lock: the lock for the read/write/erase/lock/unlock operations
* @dev: point to a spi device, or a spi nor controller device.
* @info: spi-nor part JDEC MFR id and other info
+ * @manufacturer_sfdp: manufacturer specific SFDP table
* @page_size: the page size of the SPI NOR
* @addr_width: number of address bytes
* @erase_opcode: the opcode for erasing a sector
@@ -289,6 +290,7 @@ struct spi_nor {
struct udevice *dev;
struct spi_slave *spi;
const struct flash_info *info;
+ u8 *manufacturer_sfdp;
u32 page_size;
u8 addr_width;
u8 erase_opcode;
--
2.9.5
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