On 12/02/2016 12:31 PM, Ricardo Ribalda Delgado wrote:
> Xilinx Spartan-3AN FPGAs contain an In-System Flash where they keep
> their configuration data and (optionally) some user data.
>
> The protocol of this flash follows most of the spi-nor standard. With
> the following differences:
>
> - Page size might not be a power of two.
> - The address calculation (default addressing mode).
> - The spi nor commands used.
>
> Protocol is described on Xilinx User Guide UG333
>
> Reviewed-by: Cyrille Pitchen <cyrille.pitc...@atmel.com>
> Signed-off-by: Ricardo Ribalda Delgado <ricardo.riba...@gmail.com>
> Cc: Boris Brezillon <boris.brezil...@free-electrons.com>
> Cc: Brian Norris <computersforpe...@gmail.com>
> Cc: Marek Vasut <marek.va...@gmail.com>
[...]
> +static int s3an_nor_scan(const struct flash_info *info, struct spi_nor *nor)
> +{
> + int ret;
> + u8 val;
> +
> + ret = nor->read_reg(nor, SPINOR_OP_XRDSR, &val, 1);
> + if (ret < 0) {
> + dev_err(nor->dev, "error %d reading XRDSR\n", (int) ret);
> + return ret;
> + }
> +
> + nor->erase_opcode = SPINOR_OP_XSE;
> + nor->program_opcode = SPINOR_OP_XPP;
> + nor->read_opcode = SPINOR_OP_READ;
> + nor->flags |= SNOR_F_NO_OP_CHIP_ERASE ;
NIT: You have an extra space before ; ^
> +
> + /*
> + * This flashes have a page size of 264 or 528 bytes (known as
> + * Default addressing mode). It can be changed to a more standard
> + * Power of two mode where the page size is 256/512. This comes
> + * with a price: there is 3% less of space, the data is corrupted
> + * and the page size cannot be changed back to default addressing
> + * mode.
> + *
> + * The current addressing mode can be read from the XRDSR register
> + * and should not be changed, because is a destructive operation.
> + */
> + if (val & XSR_PAGESIZE) {
> + /* Flash in Power of 2 mode */
> + nor->page_size = (nor->page_size == 264) ? 256 : 512;
> + nor->mtd.writebufsize = nor->page_size;
> + nor->mtd.size = 8 * nor->page_size * info->n_sectors;
> + nor->mtd.erasesize = 8 * nor->page_size;
> + } else {
> + /* Flash in Default addressing mode */
> + nor->flags |= SNOR_F_S3AN_ADDR_DEFAULT;
> + }
> +
> + return 0;
> +}
Looks great otherwise:
Reviewed-by: Marek Vasut <marek.va...@gmail.com>
--
Best regards,
Marek Vasut
