From 6a9eda34418fc4dc05c2a7d6741c475e287d418c Mon Sep 17 00:00:00 2001 From: Takahiro Kuwano Date: Tue, 20 Feb 2024 17:34:09 +0900 Subject: mtd: spi-nor: core: set mtd->eraseregions for non-uniform erase map Some of Infineon SPI NOR flash devices support hybrid sector layout that overlays 4KB sectors on a 256KB sector and SPI NOR framework recognizes that by parsing SMPT and construct params->erase_map. The hybrid sector layout is similar to CFI flash devices that have small sectors on top and/or bottom address. In case of CFI flash devices, the erase map information is parsed through CFI table and populated into mtd->eraseregions so that users can create MTD partitions that aligned with small sector boundaries. This patch provides the same capability to SPI NOR flash devices that have non-uniform erase map. Signed-off-by: Takahiro Kuwano Reviewed-by: Michael Walle Link: https://lore.kernel.org/r/35d0962986e493b06c13bdf7ada8130a9966dc02.1708404584.git.Takahiro.Kuwano@infineon.com Signed-off-by: Tudor Ambarus --- drivers/mtd/spi-nor/core.c | 58 ++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 56 insertions(+), 2 deletions(-) (limited to 'drivers/mtd') diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c index 898472538dae..65b32ea59afc 100644 --- a/drivers/mtd/spi-nor/core.c +++ b/drivers/mtd/spi-nor/core.c @@ -3369,7 +3369,54 @@ static const struct flash_info *spi_nor_get_flash_info(struct spi_nor *nor, return info; } -static void spi_nor_set_mtd_info(struct spi_nor *nor) +static u32 +spi_nor_get_region_erasesize(const struct spi_nor_erase_region *region, + const struct spi_nor_erase_type *erase_type) +{ + u8 i; + + if (region->overlaid) + return region->size; + + for (i = SNOR_ERASE_TYPE_MAX - 1; i >= 0; i--) { + if (region->erase_mask & BIT(i)) + return erase_type[i].size; + } + + return 0; +} + +static int spi_nor_set_mtd_eraseregions(struct spi_nor *nor) +{ + const struct spi_nor_erase_map *map = &nor->params->erase_map; + const struct spi_nor_erase_region *region = map->regions; + struct mtd_erase_region_info *mtd_region; + struct mtd_info *mtd = &nor->mtd; + u32 erasesize, i; + + mtd_region = devm_kcalloc(nor->dev, map->n_regions, sizeof(*mtd_region), + GFP_KERNEL); + if (!mtd_region) + return -ENOMEM; + + for (i = 0; i < map->n_regions; i++) { + erasesize = spi_nor_get_region_erasesize(®ion[i], + map->erase_type); + if (!erasesize) + return -EINVAL; + + mtd_region[i].erasesize = erasesize; + mtd_region[i].numblocks = div64_ul(region[i].size, erasesize); + mtd_region[i].offset = region[i].offset; + } + + mtd->numeraseregions = map->n_regions; + mtd->eraseregions = mtd_region; + + return 0; +} + +static int spi_nor_set_mtd_info(struct spi_nor *nor) { struct mtd_info *mtd = &nor->mtd; struct device *dev = nor->dev; @@ -3400,6 +3447,11 @@ static void spi_nor_set_mtd_info(struct spi_nor *nor) mtd->_resume = spi_nor_resume; mtd->_get_device = spi_nor_get_device; mtd->_put_device = spi_nor_put_device; + + if (!spi_nor_has_uniform_erase(nor)) + return spi_nor_set_mtd_eraseregions(nor); + + return 0; } static int spi_nor_hw_reset(struct spi_nor *nor) @@ -3490,7 +3542,9 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, return ret; /* No mtd_info fields should be used up to this point. */ - spi_nor_set_mtd_info(nor); + ret = spi_nor_set_mtd_info(nor); + if (ret) + return ret; dev_dbg(dev, "Manufacturer and device ID: %*phN\n", SPI_NOR_MAX_ID_LEN, nor->id); -- cgit v1.2.3-58-ga151