Merge tag 'spi-nor/for-6.9' into mtd/next

SPI NOR gets the non uniform erase code cleaned. We stopped using
bitmasks for erase types and flags, and instead introduced dedicated
members. We then passed the SPI NOR erase map to MTD. Users can now
determine the erase regions and make informed decisions on partitions
size.

Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml

···
     minItems: 1
     maxItems: 2
 
+  interrupts:
+    maxItems: 1
+
   m25p,fast-read:
     type: boolean
     description:

drivers/mtd/spi-nor/core.c

···
 
 static bool spi_nor_has_uniform_erase(const struct spi_nor *nor)
 {
-	return !!nor->params->erase_map.uniform_erase_type;
+	return !!nor->params->erase_map.uniform_region.erase_mask;
 }
 
 static void spi_nor_set_4byte_opcodes(struct spi_nor *nor)
···
 	const struct spi_nor_erase_type *erase;
 	u32 rem;
 	int i;
-	u8 erase_mask = region->offset & SNOR_ERASE_TYPE_MASK;
 
 	/*
 	 * Erase types are ordered by size, with the smallest erase type at
···
 	 */
 	for (i = SNOR_ERASE_TYPE_MAX - 1; i >= 0; i--) {
 		/* Does the erase region support the tested erase type? */
-		if (!(erase_mask & BIT(i)))
+		if (!(region->erase_mask & BIT(i)))
 			continue;
 
 		erase = &map->erase_type[i];
···
 			continue;
 
 		/* Alignment is not mandatory for overlaid regions */
-		if (region->offset & SNOR_OVERLAID_REGION &&
-		    region->size <= len)
+		if (region->overlaid && region->size <= len)
 			return erase;
 
 		/* Don't erase more than what the user has asked for. */
···
 	}
 
 	return NULL;
-}
-
-static u64 spi_nor_region_is_last(const struct spi_nor_erase_region *region)
-{
-	return region->offset & SNOR_LAST_REGION;
-}
-
-static u64 spi_nor_region_end(const struct spi_nor_erase_region *region)
-{
-	return (region->offset & ~SNOR_ERASE_FLAGS_MASK) + region->size;
-}
-
-/**
- * spi_nor_region_next() - get the next spi nor region
- * @region:	pointer to a structure that describes a SPI NOR erase region
- *
- * Return: the next spi nor region or NULL if last region.
- */
-struct spi_nor_erase_region *
-spi_nor_region_next(struct spi_nor_erase_region *region)
-{
-	if (spi_nor_region_is_last(region))
-		return NULL;
-	region++;
-	return region;
-}
-
-/**
- * spi_nor_find_erase_region() - find the region of the serial flash memory in
- *				 which the offset fits
- * @map:	the erase map of the SPI NOR
- * @addr:	offset in the serial flash memory
- *
- * Return: a pointer to the spi_nor_erase_region struct, ERR_PTR(-errno)
- *	   otherwise.
- */
-static struct spi_nor_erase_region *
-spi_nor_find_erase_region(const struct spi_nor_erase_map *map, u64 addr)
-{
-	struct spi_nor_erase_region *region = map->regions;
-	u64 region_start = region->offset & ~SNOR_ERASE_FLAGS_MASK;
-	u64 region_end = region_start + region->size;
-
-	while (addr < region_start || addr >= region_end) {
-		region = spi_nor_region_next(region);
-		if (!region)
-			return ERR_PTR(-EINVAL);
-
-		region_start = region->offset & ~SNOR_ERASE_FLAGS_MASK;
-		region_end = region_start + region->size;
-	}
-
-	return region;
 }
 
 /**
···
 	cmd->opcode = erase->opcode;
 	cmd->count = 1;
 
-	if (region->offset & SNOR_OVERLAID_REGION)
+	if (region->overlaid)
 		cmd->size = region->size;
 	else
 		cmd->size = erase->size;
···
 	struct spi_nor_erase_region *region;
 	struct spi_nor_erase_command *cmd = NULL;
 	u64 region_end;
+	unsigned int i;
 	int ret = -EINVAL;
 
-	region = spi_nor_find_erase_region(map, addr);
-	if (IS_ERR(region))
-		return PTR_ERR(region);
+	for (i = 0; i < map->n_regions && len; i++) {
+		region = &map->regions[i];
+		region_end = region->offset + region->size;
 
-	region_end = spi_nor_region_end(region);
-
-	while (len) {
-		erase = spi_nor_find_best_erase_type(map, region, addr, len);
-		if (!erase)
-			goto destroy_erase_cmd_list;
-
-		if (prev_erase != erase ||
-		    erase->size != cmd->size ||
-		    region->offset & SNOR_OVERLAID_REGION) {
-			cmd = spi_nor_init_erase_cmd(region, erase);
-			if (IS_ERR(cmd)) {
-				ret = PTR_ERR(cmd);
+		while (len && addr >= region->offset && addr < region_end) {
+			erase = spi_nor_find_best_erase_type(map, region, addr,
+							     len);
+			if (!erase)
 				goto destroy_erase_cmd_list;
+
+			if (prev_erase != erase || erase->size != cmd->size ||
+			    region->overlaid) {
+				cmd = spi_nor_init_erase_cmd(region, erase);
+				if (IS_ERR(cmd)) {
+					ret = PTR_ERR(cmd);
+					goto destroy_erase_cmd_list;
+				}
+
+				list_add_tail(&cmd->list, erase_list);
+			} else {
+				cmd->count++;
 			}
 
-			list_add_tail(&cmd->list, erase_list);
-		} else {
-			cmd->count++;
+			len -= cmd->size;
+			addr += cmd->size;
+			prev_erase = erase;
 		}
-
-		addr += cmd->size;
-		len -= cmd->size;
-
-		if (len && addr >= region_end) {
-			region = spi_nor_region_next(region);
-			if (!region)
-				goto destroy_erase_cmd_list;
-			region_end = spi_nor_region_end(region);
-		}
-
-		prev_erase = erase;
 	}
 
 	return 0;
···
 void spi_nor_init_uniform_erase_map(struct spi_nor_erase_map *map,
 				    u8 erase_mask, u64 flash_size)
 {
-	/* Offset 0 with erase_mask and SNOR_LAST_REGION bit set */
-	map->uniform_region.offset = (erase_mask & SNOR_ERASE_TYPE_MASK) |
-				     SNOR_LAST_REGION;
+	map->uniform_region.offset = 0;
 	map->uniform_region.size = flash_size;
+	map->uniform_region.erase_mask = erase_mask;
 	map->regions = &map->uniform_region;
-	map->uniform_erase_type = erase_mask;
+	map->n_regions = 1;
 }
 
 int spi_nor_post_bfpt_fixups(struct spi_nor *nor,
···
 {
 	const struct spi_nor_erase_type *tested_erase, *erase = NULL;
 	int i;
-	u8 uniform_erase_type = map->uniform_erase_type;
+	u8 uniform_erase_type = map->uniform_region.erase_mask;
 
 	/*
 	 * Search for the biggest erase size, except for when compiled
···
 		return NULL;
 
 	/* Disable all other Sector Erase commands. */
-	map->uniform_erase_type &= ~SNOR_ERASE_TYPE_MASK;
-	map->uniform_erase_type |= BIT(erase - map->erase_type);
+	map->uniform_region.erase_mask = BIT(erase - map->erase_type);
 	return erase;
 }
 
···
 	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(&region[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;
···
 	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)
···
 		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);

drivers/mtd/spi-nor/core.h

···
 /**
  * struct spi_nor_erase_region - Structure to describe a SPI NOR erase region
  * @offset:		the offset in the data array of erase region start.
- *			LSB bits are used as a bitmask encoding flags to
- *			determine if this region is overlaid, if this region is
- *			the last in the SPI NOR flash memory and to indicate
- *			all the supported erase commands inside this region.
- *			The erase types are sorted in ascending order with the
- *			smallest Erase Type size being at BIT(0).
  * @size:		the size of the region in bytes.
+ * @erase_mask:		bitmask to indicate all the supported erase commands
+ *			inside this region. The erase types are sorted in
+ *			ascending order with the smallest Erase Type size being
+ *			at BIT(0).
+ * @overlaid:		determine if this region is overlaid.
  */
 struct spi_nor_erase_region {
 	u64		offset;
 	u64		size;
+	u8		erase_mask;
+	bool		overlaid;
 };
 
 #define SNOR_ERASE_TYPE_MAX	4
-#define SNOR_ERASE_TYPE_MASK	GENMASK_ULL(SNOR_ERASE_TYPE_MAX - 1, 0)
-
-#define SNOR_LAST_REGION	BIT(4)
-#define SNOR_OVERLAID_REGION	BIT(5)
-
-#define SNOR_ERASE_FLAGS_MAX	6
-#define SNOR_ERASE_FLAGS_MASK	GENMASK_ULL(SNOR_ERASE_FLAGS_MAX - 1, 0)
 
 /**
  * struct spi_nor_erase_map - Structure to describe the SPI NOR erase map
···
  *			The erase types are sorted in ascending order, with the
  *			smallest Erase Type size being the first member in the
  *			erase_type array.
- * @uniform_erase_type:	bitmask encoding erase types that can erase the
- *			entire memory. This member is completed at init by
- *			uniform and non-uniform SPI NOR flash memories if they
- *			support at least one erase type that can erase the
- *			entire memory.
+ * @n_regions:		number of erase regions.
  */
 struct spi_nor_erase_map {
 	struct spi_nor_erase_region	*regions;
 	struct spi_nor_erase_region	uniform_region;
 	struct spi_nor_erase_type	erase_type[SNOR_ERASE_TYPE_MAX];
-	u8				uniform_erase_type;
+	unsigned int			n_regions;
 };
 
 /**
···
 void spi_nor_set_erase_type(struct spi_nor_erase_type *erase, u32 size,
 			    u8 opcode);
 void spi_nor_mask_erase_type(struct spi_nor_erase_type *erase);
-struct spi_nor_erase_region *
-spi_nor_region_next(struct spi_nor_erase_region *region);
 void spi_nor_init_uniform_erase_map(struct spi_nor_erase_map *map,
 				    u8 erase_mask, u64 flash_size);
 

drivers/mtd/spi-nor/debugfs.c

···
 	struct spi_nor *nor = s->private;
 	struct spi_nor_flash_parameter *params = nor->params;
 	struct spi_nor_erase_map *erase_map = &params->erase_map;
-	struct spi_nor_erase_region *region;
+	struct spi_nor_erase_region *region = erase_map->regions;
 	const struct flash_info *info = nor->info;
 	char buf[16], *str;
-	int i;
+	unsigned int i;
 
 	seq_printf(s, "name\t\t%s\n", info->name);
 	seq_printf(s, "id\t\t%*ph\n", SPI_NOR_MAX_ID_LEN, nor->id);
···
 	}
 
 	seq_puts(s, "\nsector map\n");
-	seq_puts(s, " region (in hex)   | erase mask | flags\n");
+	seq_puts(s, " region (in hex)   | erase mask | overlaid\n");
 	seq_puts(s, " ------------------+------------+----------\n");
-	for (region = erase_map->regions;
-	     region;
-	     region = spi_nor_region_next(region)) {
-		u64 start = region->offset & ~SNOR_ERASE_FLAGS_MASK;
-		u64 flags = region->offset & SNOR_ERASE_FLAGS_MASK;
-		u64 end = start + region->size - 1;
+	for (i = 0; i < erase_map->n_regions; i++) {
+		u64 start = region[i].offset;
+		u64 end = start + region[i].size - 1;
+		u8 erase_mask = region[i].erase_mask;
 
 		seq_printf(s, " %08llx-%08llx |     [%c%c%c%c] | %s\n",
 			   start, end,
-			   flags & BIT(0) ? '0' : ' ',
-			   flags & BIT(1) ? '1' : ' ',
-			   flags & BIT(2) ? '2' : ' ',
-			   flags & BIT(3) ? '3' : ' ',
-			   flags & SNOR_OVERLAID_REGION ? "overlaid" : "");
+			   erase_mask & BIT(0) ? '0' : ' ',
+			   erase_mask & BIT(1) ? '1' : ' ',
+			   erase_mask & BIT(2) ? '2' : ' ',
+			   erase_mask & BIT(3) ? '3' : ' ',
+			   region[i].overlaid ? "yes" : "no");
 	}
 
 	return 0;

drivers/mtd/spi-nor/sfdp.c

···
 static void spi_nor_regions_sort_erase_types(struct spi_nor_erase_map *map)
 {
 	struct spi_nor_erase_region *region = map->regions;
-	u8 region_erase_mask, sorted_erase_mask;
+	u8 sorted_erase_mask;
+	unsigned int i;
 
-	while (region) {
-		region_erase_mask = region->offset & SNOR_ERASE_TYPE_MASK;
-
-		sorted_erase_mask = spi_nor_sort_erase_mask(map,
-							    region_erase_mask);
+	for (i = 0; i < map->n_regions; i++) {
+		sorted_erase_mask =
+			spi_nor_sort_erase_mask(map, region[i].erase_mask);
 
 		/* Overwrite erase mask. */
-		region->offset = (region->offset & ~SNOR_ERASE_TYPE_MASK) |
-				 sorted_erase_mask;
-
-		region = spi_nor_region_next(region);
+		region[i].erase_mask = sorted_erase_mask;
 	}
 }
 
···
 	 * selecting the uniform erase.
 	 */
 	spi_nor_regions_sort_erase_types(map);
-	map->uniform_erase_type = map->uniform_region.offset &
-				  SNOR_ERASE_TYPE_MASK;
 
 	/* Stop here if not JESD216 rev A or later. */
 	if (bfpt_header->length == BFPT_DWORD_MAX_JESD216)
···
 	return ret;
 }
 
-static void spi_nor_region_mark_end(struct spi_nor_erase_region *region)
-{
-	region->offset |= SNOR_LAST_REGION;
-}
-
-static void spi_nor_region_mark_overlay(struct spi_nor_erase_region *region)
-{
-	region->offset |= SNOR_OVERLAID_REGION;
-}
-
 /**
  * spi_nor_region_check_overlay() - set overlay bit when the region is overlaid
  * @region:	pointer to a structure that describes a SPI NOR erase region
···
 		if (!(erase[i].size && erase_type & BIT(erase[i].idx)))
 			continue;
 		if (region->size & erase[i].size_mask) {
-			spi_nor_region_mark_overlay(region);
+			region->overlaid = true;
 			return;
 		}
 	}
···
 	if (!region)
 		return -ENOMEM;
 	map->regions = region;
+	map->n_regions = region_count;
 
 	uniform_erase_type = 0xff;
 	regions_erase_type = 0;
···
 	/* Populate regions. */
 	for (i = 0; i < region_count; i++) {
 		j = i + 1; /* index for the region dword */
+		region[i].offset = offset;
 		region[i].size = SMPT_MAP_REGION_SIZE(smpt[j]);
 		erase_type = SMPT_MAP_REGION_ERASE_TYPE(smpt[j]);
-		region[i].offset = offset | erase_type;
+		region[i].erase_mask = erase_type;
 
 		spi_nor_region_check_overlay(&region[i], erase, erase_type);
 
···
 		 */
 		regions_erase_type |= erase_type;
 
-		offset = (region[i].offset & ~SNOR_ERASE_FLAGS_MASK) +
-			 region[i].size;
+		offset = region[i].offset + region[i].size;
 	}
-	spi_nor_region_mark_end(&region[i - 1]);
 
-	save_uniform_erase_type = map->uniform_erase_type;
-	map->uniform_erase_type = spi_nor_sort_erase_mask(map,
-							  uniform_erase_type);
+	save_uniform_erase_type = map->uniform_region.erase_mask;
+	map->uniform_region.erase_mask =
+				spi_nor_sort_erase_mask(map,
+							uniform_erase_type);
 
 	if (!regions_erase_type) {
 		/*
 		 * Roll back to the previous uniform_erase_type mask, SMPT is
 		 * broken.
 		 */
-		map->uniform_erase_type = save_uniform_erase_type;
+		map->uniform_region.erase_mask = save_uniform_erase_type;
 		return -EINVAL;
 	}