[U-Boot] [PATCH 1/4] mtd: spi: spi-nor-core: Add Microchip SFDP parser

[Vignesh Raghavendra]

Hi Tudor,

On 01/10/19 2:29 PM, Tudor.Ambarus at microchip.com wrote:
> From: Tudor Ambarus <tudor.ambarus at 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.ambarus at 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 */
>  

Is this ID unique enough such that no other vendor will use the same? I
recall that MSB byte should be assigned to Vendor and 0x01 does not seem
to be Microchip specific? Or did I miss something?

Regards
Vignesh

>  #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;
> 

-- 
Regards
Vignesh