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SubjectRe: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP SPI NOR flash memories
From
Date
Hi, Yogesh,

On 10/16/2018 12:51 PM, Yogesh Narayan Gaur wrote:
> Hi Tudor,
>
> This patch is breaking the 1-4-4 Read protocol for the spansion flash "s25fl512s".
>
> Without this patch read request command for Quad mode, 4-byte enable, is coming as 0xEC i.e. SPINOR_OP_READ_1_4_4_4B.
> But after applying this patch, read request command for Quad mode is coming as 0x6C i.e. SPINOR_OP_READ_1_1_4_4B.
>
> This flash also supports non-uniform erase.
> Can you please check and provide some suggestion?

I don't have this memory to test it, but I'll try to help.

Does s25fl512s support non-uniform erase? I'm looking in datasheet[1] at JEDEC
BFPT table, dwords 8 and 9, page 132/146 and it looks like it supports just
256KB uniform erase.

Thanks,
ta

[1] http://www.cypress.com/file/177971/download

>
> --
> Regards
> Yogesh Gaur
>
>> -----Original Message-----
>> From: linux-mtd [mailto:linux-mtd-bounces@lists.infradead.org] On Behalf Of
>> Tudor Ambarus
>> Sent: Tuesday, September 11, 2018 9:10 PM
>> To: marek.vasut@gmail.com; dwmw2@infradead.org;
>> computersforpeace@gmail.com; boris.brezillon@bootlin.com; richard@nod.at
>> Cc: Tudor Ambarus <tudor.ambarus@microchip.com>; linux-
>> kernel@vger.kernel.org; nicolas.ferre@microchip.com;
>> cyrille.pitchen@microchip.com; linux-mtd@lists.infradead.org; linux-arm-
>> kernel@lists.infradead.org; Cristian.Birsan@microchip.com
>> Subject: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP SPI NOR
>> flash memories
>>
>> Based on Cyrille Pitchen's patch
>> https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.or
>> g%2Flkml%2F2017%2F3%2F22%2F935&amp;data=02%7C01%7Cyogeshnarayan.
>> gaur%40nxp.com%7C3c782e52b7fd4a8b9af008d617fd5154%7C686ea1d3bc2b4
>> c6fa92cd99c5c301635%7C0%7C0%7C636722774108718782&amp;sdata=szyc%
>> 2FTumG6eYAmBd0oW3IL7v1yLh9E1SAZqL%2BCWczOA%3D&amp;reserved=0.
>>
>> This patch is a transitional patch in introducing the support of SFDP SPI
>> memories with non-uniform erase sizes like Spansion s25fs512s.
>> Non-uniform erase maps will be used later when initialized based on the SFDP
>> data.
>>
>> Introduce the memory erase map which splits the memory array into one or
>> many erase regions. Each erase region supports up to 4 erase types, as defined
>> by the JEDEC JESD216B (SFDP) specification.
>>
>> To be backward compatible, the erase map of uniform SPI NOR flash memories
>> is initialized so it contains only one erase region and this erase region supports
>> only one erase command. Hence a single size is used to erase any sector/block
>> of the memory.
>>
>> Besides, since the algorithm used to erase sectors on non-uniform SPI NOR flash
>> memories is quite expensive, when possible, the erase map is tuned to come
>> back to the uniform case.
>>
>> The 'erase with the best command, move forward and repeat' approach was
>> suggested by Cristian Birsan in a brainstorm session, so:
>>
>> Suggested-by: Cristian Birsan <cristian.birsan@microchip.com>
>> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
>> ---
>> drivers/mtd/spi-nor/spi-nor.c | 594
>> +++++++++++++++++++++++++++++++++++++++---
>> include/linux/mtd/spi-nor.h | 107 ++++++++
>> 2 files changed, 659 insertions(+), 42 deletions(-)
>>
>> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c index
>> dc8757e..4687345 100644
>> --- a/drivers/mtd/spi-nor/spi-nor.c
>> +++ b/drivers/mtd/spi-nor/spi-nor.c
>> @@ -18,6 +18,7 @@
>> #include <linux/math64.h>
>> #include <linux/sizes.h>
>> #include <linux/slab.h>
>> +#include <linux/sort.h>
>>
>> #include <linux/mtd/mtd.h>
>> #include <linux/of_platform.h>
>> @@ -261,6 +262,18 @@ static void spi_nor_set_4byte_opcodes(struct spi_nor
>> *nor,
>> nor->read_opcode = spi_nor_convert_3to4_read(nor->read_opcode);
>> nor->program_opcode = spi_nor_convert_3to4_program(nor-
>>> program_opcode);
>> nor->erase_opcode = spi_nor_convert_3to4_erase(nor->erase_opcode);
>> +
>> + if (!spi_nor_has_uniform_erase(nor)) {
>> + struct spi_nor_erase_map *map = &nor->erase_map;
>> + struct spi_nor_erase_type *erase;
>> + int i;
>> +
>> + for (i = 0; i < SNOR_ERASE_TYPE_MAX; i++) {
>> + erase = &map->erase_type[i];
>> + erase->opcode =
>> + spi_nor_convert_3to4_erase(erase->opcode);
>> + }
>> + }
>> }
>>
>> /* Enable/disable 4-byte addressing mode. */ @@ -499,6 +512,275 @@ static
>> int spi_nor_erase_sector(struct spi_nor *nor, u32 addr) }
>>
>> /*
>> + * spi_nor_div_by_erase_size() - calculate remainder and update new dividend
>> + * @erase: pointer to a structure that describes a SPI NOR erase type
>> + * @dividend: dividend value
>> + * @remainder: pointer to u32 remainder (will be updated)
>> + *
>> + * Returns two values: remainder and the new dividend */ static u64
>> +spi_nor_div_by_erase_size(const struct spi_nor_erase_type *erase,
>> + u64 dividend, u32 *remainder)
>> +{
>> + /* JEDEC JESD216B Standard imposes erase sizes to be power of 2. */
>> + *remainder = (u32)dividend & erase->size_mask;
>> + return dividend >> erase->size_shift;
>> +}
>> +
>> +/*
>> + * spi_nor_find_best_erase_type() - find the best erase type for the
>> +given
>> + * offset in the serial flash memory and the number of bytes to erase.
>> +The
>> + * region in which the address fits is expected to be provided.
>> + * @map: the erase map of the SPI NOR
>> + * @region: pointer to a structure that describes a SPI NOR erase region
>> + * @addr: offset in the serial flash memory
>> + * @len: number of bytes to erase
>> + *
>> + * Returns a pointer to the best fitted erase type, NULL otherwise.
>> + */
>> +static const struct spi_nor_erase_type *
>> +spi_nor_find_best_erase_type(const struct spi_nor_erase_map *map,
>> + const struct spi_nor_erase_region *region,
>> + u64 addr, u32 len)
>> +{
>> + 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 biggest erase type at
>> + * index 0.
>> + */
>> + for (i = SNOR_ERASE_TYPE_MAX - 1; i >= 0; i--) {
>> + /* Does the erase region support the tested erase type? */
>> + if (!(erase_mask & BIT(i)))
>> + continue;
>> +
>> + erase = &map->erase_type[i];
>> +
>> + /* Don't erase more than what the user has asked for. */
>> + if (erase->size > len)
>> + continue;
>> +
>> + /* Alignment is not mandatory for overlaid regions */
>> + if (region->offset & SNOR_OVERLAID_REGION)
>> + return erase;
>> +
>> + spi_nor_div_by_erase_size(erase, addr, &rem);
>> + if (rem)
>> + continue;
>> + else
>> + return erase;
>> + }
>> +
>> + return NULL;
>> +}
>> +
>> +/*
>> + * spi_nor_region_next() - get the next spi nor region
>> + * @region: pointer to a structure that describes a SPI NOR erase region
>> + *
>> + * Returns the next spi nor region or NULL if last region.
>> + */
>> +static 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
>> + *
>> + * Returns 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;
>> +}
>> +
>> +/*
>> + * spi_nor_init_erase_cmd() - initialize an erase command
>> + * @region: pointer to a structure that describes a SPI NOR erase region
>> + * @erase: pointer to a structure that describes a SPI NOR erase type
>> + *
>> + * Returns the pointer to the allocated erase command, ERR_PTR(-errno)
>> + * otherwise.
>> + */
>> +static struct spi_nor_erase_command *
>> +spi_nor_init_erase_cmd(const struct spi_nor_erase_region *region,
>> + const struct spi_nor_erase_type *erase) {
>> + struct spi_nor_erase_command *cmd;
>> +
>> + cmd = kmalloc(sizeof(*cmd), GFP_KERNEL);
>> + if (!cmd)
>> + return ERR_PTR(-ENOMEM);
>> +
>> + INIT_LIST_HEAD(&cmd->list);
>> + cmd->opcode = erase->opcode;
>> + cmd->count = 1;
>> +
>> + if (region->offset & SNOR_OVERLAID_REGION)
>> + cmd->size = region->size;
>> + else
>> + cmd->size = erase->size;
>> +
>> + return cmd;
>> +}
>> +
>> +/*
>> + * spi_nor_destroy_erase_cmd_list() - destroy erase command list
>> + * @erase_list: list of erase commands
>> + */
>> +static void spi_nor_destroy_erase_cmd_list(struct list_head
>> +*erase_list) {
>> + struct spi_nor_erase_command *cmd, *next;
>> +
>> + list_for_each_entry_safe(cmd, next, erase_list, list) {
>> + list_del(&cmd->list);
>> + kfree(cmd);
>> + }
>> +}
>> +
>> +/*
>> + * spi_nor_init_erase_cmd_list() - initialize erase command list
>> + * @nor: pointer to a 'struct spi_nor'
>> + * @erase_list: list of erase commands to be executed once we validate that
>> the
>> + * erase can be performed
>> + * @addr: offset in the serial flash memory
>> + * @len: number of bytes to erase
>> + *
>> + * Builds the list of best fitted erase commands and verifies if the
>> +erase can
>> + * be performed.
>> + *
>> + * Returns 0 on success, -errno otherwise.
>> + */
>> +static int spi_nor_init_erase_cmd_list(struct spi_nor *nor,
>> + struct list_head *erase_list,
>> + u64 addr, u32 len)
>> +{
>> + const struct spi_nor_erase_map *map = &nor->erase_map;
>> + const struct spi_nor_erase_type *erase, *prev_erase = NULL;
>> + struct spi_nor_erase_region *region;
>> + struct spi_nor_erase_command *cmd = NULL;
>> + u64 region_end;
>> + int ret = -EINVAL;
>> +
>> + region = spi_nor_find_erase_region(map, addr);
>> + if (IS_ERR(region))
>> + return PTR_ERR(region);
>> +
>> + 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 ||
>> + region->offset & SNOR_OVERLAID_REGION) {
>> + 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++;
>> + }
>> +
>> + 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;
>> +
>> +destroy_erase_cmd_list:
>> + spi_nor_destroy_erase_cmd_list(erase_list);
>> + return ret;
>> +}
>> +
>> +/*
>> + * spi_nor_erase_multi_sectors() - perform a non-uniform erase
>> + * @nor: pointer to a 'struct spi_nor'
>> + * @addr: offset in the serial flash memory
>> + * @len: number of bytes to erase
>> + *
>> + * Build a list of best fitted erase commands and execute it once we
>> + * validate that the erase can be performed.
>> + *
>> + * Returns 0 on success, -errno otherwise.
>> + */
>> +static int spi_nor_erase_multi_sectors(struct spi_nor *nor, u64 addr,
>> +u32 len) {
>> + LIST_HEAD(erase_list);
>> + struct spi_nor_erase_command *cmd, *next;
>> + int ret;
>> +
>> + ret = spi_nor_init_erase_cmd_list(nor, &erase_list, addr, len);
>> + if (ret)
>> + return ret;
>> +
>> + list_for_each_entry_safe(cmd, next, &erase_list, list) {
>> + nor->erase_opcode = cmd->opcode;
>> + while (cmd->count) {
>> + write_enable(nor);
>> +
>> + ret = spi_nor_erase_sector(nor, addr);
>> + if (ret)
>> + goto destroy_erase_cmd_list;
>> +
>> + addr += cmd->size;
>> + cmd->count--;
>> +
>> + ret = spi_nor_wait_till_ready(nor);
>> + if (ret)
>> + goto destroy_erase_cmd_list;
>> + }
>> + list_del(&cmd->list);
>> + kfree(cmd);
>> + }
>> +
>> + return 0;
>> +
>> +destroy_erase_cmd_list:
>> + spi_nor_destroy_erase_cmd_list(&erase_list);
>> + return ret;
>> +}
>> +
>> +/*
>> * Erase an address range on the nor chip. The address range may extend
>> * one or more erase sectors. Return an error is there is a problem erasing.
>> */
>> @@ -512,9 +794,11 @@ static int spi_nor_erase(struct mtd_info *mtd, struct
>> erase_info *instr)
>> dev_dbg(nor->dev, "at 0x%llx, len %lld\n", (long long)instr->addr,
>> (long long)instr->len);
>>
>> - div_u64_rem(instr->len, mtd->erasesize, &rem);
>> - if (rem)
>> - return -EINVAL;
>> + if (spi_nor_has_uniform_erase(nor)) {
>> + div_u64_rem(instr->len, mtd->erasesize, &rem);
>> + if (rem)
>> + return -EINVAL;
>> + }
>>
>> addr = instr->addr;
>> len = instr->len;
>> @@ -553,7 +837,7 @@ static int spi_nor_erase(struct mtd_info *mtd, struct
>> erase_info *instr)
>> */
>>
>> /* "sector"-at-a-time erase */
>> - } else {
>> + } else if (spi_nor_has_uniform_erase(nor)) {
>> while (len) {
>> write_enable(nor);
>>
>> @@ -568,6 +852,12 @@ static int spi_nor_erase(struct mtd_info *mtd, struct
>> erase_info *instr)
>> if (ret)
>> goto erase_err;
>> }
>> +
>> + /* erase multiple sectors */
>> + } else {
>> + ret = spi_nor_erase_multi_sectors(nor, addr, len);
>> + if (ret)
>> + goto erase_err;
>> }
>>
>> write_disable(nor);
>> @@ -2190,6 +2480,113 @@ static const struct sfdp_bfpt_erase
>> sfdp_bfpt_erases[] = {
>>
>> static int spi_nor_hwcaps_read2cmd(u32 hwcaps);
>>
>> +/*
>> + * spi_nor_set_erase_type() - set a SPI NOR erase type
>> + * @erase: pointer to a structure that describes a SPI NOR erase type
>> + * @size: the size of the sector/block erased by the erase type
>> + * @opcode: the SPI command op code to erase the sector/block
>> + */
>> +static void spi_nor_set_erase_type(struct spi_nor_erase_type *erase,
>> + u32 size, u8 opcode)
>> +{
>> + erase->size = size;
>> + erase->opcode = opcode;
>> + /* JEDEC JESD216B Standard imposes erase sizes to be power of 2. */
>> + erase->size_shift = ffs(erase->size) - 1;
>> + erase->size_mask = (1 << erase->size_shift) - 1; }
>> +
>> +/*
>> + * spi_nor_set_erase_settings_from_bfpt() - set erase type settings from BFPT
>> + * @erase: pointer to a structure that describes a SPI NOR erase type
>> + * @size: the size of the sector/block erased by the erase type
>> + * @opcode: the SPI command op code to erase the sector/block
>> + * @i: erase type index as sorted in the Basic Flash Parameter Table
>> + *
>> + * The supported Erase Types will be sorted at init in ascending order,
>> +with
>> + * the smallest Erase Type size being the first member in the
>> +erase_type array
>> + * of the spi_nor_erase_map structure. Save the Erase Type index as
>> +sorted in
>> + * the Basic Flash Parameter Table since it will be used later on to
>> + * synchronize with the supported Erase Types defined in SFDP optional tables.
>> + */
>> +static void
>> +spi_nor_set_erase_settings_from_bfpt(struct spi_nor_erase_type *erase,
>> + u32 size, u8 opcode, u8 i)
>> +{
>> + erase->idx = i;
>> + spi_nor_set_erase_type(erase, size, opcode); }
>> +
>> +/* spi_nor_map_cmp_erase_type() - compare the map's erase types by size
>> + * @l: member in the left half of the map's erase_type array
>> + * @r: member in the right half of the map's erase_type array
>> + *
>> + * Comparison function used in the sort() call to sort in ascending
>> +order the
>> + * map's erase types, the smallest erase type size being the first
>> +member in the
>> + * sorted erase_type array.
>> + */
>> +static int spi_nor_map_cmp_erase_type(const void *l, const void *r) {
>> + const struct spi_nor_erase_type *left = l, *right = r;
>> +
>> + return left->size - right->size;
>> +}
>> +
>> +/*
>> + * spi_nor_regions_sort_erase_types() - sort erase types in each region
>> + * @map: the erase map of the SPI NOR
>> + *
>> + * Function assumes that the erase types defined in the erase map are
>> +already
>> + * sorted in ascending order, with the smallest erase type size being
>> +the first
>> + * member in the erase_type array. It replicates the sort done for the
>> +map's
>> + * erase types. Each region's erase bitmask will indicate which erase
>> +types are
>> + * supported from the sorted erase types defined in the erase map.
>> + * Sort the all region's erase type at init in order to speed up the
>> +process of
>> + * finding the best erase command at runtime.
>> + */
>> +static void spi_nor_regions_sort_erase_types(struct spi_nor_erase_map
>> +*map) {
>> + struct spi_nor_erase_region *region = map->regions;
>> + struct spi_nor_erase_type *erase_type = map->erase_type;
>> + int i;
>> + u8 region_erase_mask, sorted_erase_mask;
>> +
>> + while (region) {
>> + region_erase_mask = region->offset &
>> SNOR_ERASE_TYPE_MASK;
>> +
>> + /* Replicate the sort done for the map's erase types. */
>> + sorted_erase_mask = 0;
>> + for (i = 0; i < SNOR_ERASE_TYPE_MAX; i++)
>> + if (erase_type[i].size &&
>> + region_erase_mask & BIT(erase_type[i].idx))
>> + sorted_erase_mask |= BIT(i);
>> +
>> + /* Overwrite erase mask. */
>> + region->offset = (region->offset & ~SNOR_ERASE_TYPE_MASK)
>> |
>> + sorted_erase_mask;
>> +
>> + region = spi_nor_region_next(region);
>> + }
>> +}
>> +
>> +/*
>> + *spi_nor_init_uniform_erase_map() - Initialize uniform erase map
>> + * @map: the erase map of the SPI NOR
>> + * @erase_mask: bitmask encoding erase types that can erase
>> the entire
>> + * flash memory
>> + * @flash_size: the spi nor flash memory size
>> + */
>> +static 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.size = flash_size;
>> + map->regions = &map->uniform_region;
>> + map->uniform_erase_type = erase_mask;
>> +}
>> +
>> /**
>> * spi_nor_parse_bfpt() - read and parse the Basic Flash Parameter Table.
>> * @nor: pointer to a 'struct spi_nor'
>> @@ -2224,12 +2621,14 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor,
>> const struct sfdp_parameter_header *bfpt_header,
>> struct spi_nor_flash_parameter *params) {
>> - struct mtd_info *mtd = &nor->mtd;
>> + struct spi_nor_erase_map *map = &nor->erase_map;
>> + struct spi_nor_erase_type *erase_type = map->erase_type;
>> struct sfdp_bfpt bfpt;
>> size_t len;
>> int i, cmd, err;
>> u32 addr;
>> u16 half;
>> + u8 erase_mask;
>>
>> /* JESD216 Basic Flash Parameter Table length is at least 9 DWORDs. */
>> if (bfpt_header->length < BFPT_DWORD_MAX_JESD216) @@ -2298,7
>> +2697,12 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor,
>> spi_nor_set_read_settings_from_bfpt(read, half, rd->proto);
>> }
>>
>> - /* Sector Erase settings. */
>> + /*
>> + * Sector Erase settings. Reinitialize the uniform erase map using the
>> + * Erase Types defined in the bfpt table.
>> + */
>> + erase_mask = 0;
>> + memset(&nor->erase_map, 0, sizeof(nor->erase_map));
>> for (i = 0; i < ARRAY_SIZE(sfdp_bfpt_erases); i++) {
>> const struct sfdp_bfpt_erase *er = &sfdp_bfpt_erases[i];
>> u32 erasesize;
>> @@ -2313,18 +2717,25 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor,
>>
>> erasesize = 1U << erasesize;
>> opcode = (half >> 8) & 0xff;
>> -#ifdef CONFIG_MTD_SPI_NOR_USE_4K_SECTORS
>> - if (erasesize == SZ_4K) {
>> - nor->erase_opcode = opcode;
>> - mtd->erasesize = erasesize;
>> - break;
>> - }
>> -#endif
>> - if (!mtd->erasesize || mtd->erasesize < erasesize) {
>> - nor->erase_opcode = opcode;
>> - mtd->erasesize = erasesize;
>> - }
>> + erase_mask |= BIT(i);
>> + spi_nor_set_erase_settings_from_bfpt(&erase_type[i],
>> erasesize,
>> + opcode, i);
>> }
>> + spi_nor_init_uniform_erase_map(map, erase_mask, params->size);
>> + /*
>> + * Sort all the map's Erase Types in ascending order with the smallest
>> + * erase size being the first member in the erase_type array.
>> + */
>> + sort(erase_type, SNOR_ERASE_TYPE_MAX, sizeof(erase_type[0]),
>> + spi_nor_map_cmp_erase_type, NULL);
>> + /*
>> + * Sort the erase types in the uniform region in order to update the
>> + * uniform_erase_type bitmask. The bitmask will be used later on when
>> + * 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) @@ -2480,6 +2891,9
>> @@ static int spi_nor_init_params(struct spi_nor *nor,
>> const struct flash_info *info,
>> struct spi_nor_flash_parameter *params) {
>> + struct spi_nor_erase_map *map = &nor->erase_map;
>> + u8 i, erase_mask;
>> +
>> /* Set legacy flash parameters as default. */
>> memset(params, 0, sizeof(*params));
>>
>> @@ -2519,6 +2933,28 @@ static int spi_nor_init_params(struct spi_nor *nor,
>> spi_nor_set_pp_settings(&params->page_programs[SNOR_CMD_PP],
>> SPINOR_OP_PP, SNOR_PROTO_1_1_1);
>>
>> + /*
>> + * Sector Erase settings. Sort Erase Types in ascending order, with the
>> + * smallest erase size starting at BIT(0).
>> + */
>> + erase_mask = 0;
>> + i = 0;
>> + if (info->flags & SECT_4K_PMC) {
>> + erase_mask |= BIT(i);
>> + spi_nor_set_erase_type(&map->erase_type[i], 4096u,
>> + SPINOR_OP_BE_4K_PMC);
>> + i++;
>> + } else if (info->flags & SECT_4K) {
>> + erase_mask |= BIT(i);
>> + spi_nor_set_erase_type(&map->erase_type[i], 4096u,
>> + SPINOR_OP_BE_4K);
>> + i++;
>> + }
>> + erase_mask |= BIT(i);
>> + spi_nor_set_erase_type(&map->erase_type[i], info->sector_size,
>> + SPINOR_OP_SE);
>> + spi_nor_init_uniform_erase_map(map, erase_mask, params->size);
>> +
>> /* Select the procedure to set the Quad Enable bit. */
>> if (params->hwcaps.mask & (SNOR_HWCAPS_READ_QUAD |
>> SNOR_HWCAPS_PP_QUAD)) {
>> @@ -2546,20 +2982,20 @@ static int spi_nor_init_params(struct spi_nor *nor,
>> params->quad_enable = info->quad_enable;
>> }
>>
>> - /* Override the parameters with data read from SFDP tables. */
>> - nor->addr_width = 0;
>> - nor->mtd.erasesize = 0;
>> if ((info->flags & (SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ)) &&
>> !(info->flags & SPI_NOR_SKIP_SFDP)) {
>> struct spi_nor_flash_parameter sfdp_params;
>> + struct spi_nor_erase_map prev_map;
>>
>> memcpy(&sfdp_params, params, sizeof(sfdp_params));
>> - if (spi_nor_parse_sfdp(nor, &sfdp_params)) {
>> - nor->addr_width = 0;
>> - nor->mtd.erasesize = 0;
>> - } else {
>> + memcpy(&prev_map, &nor->erase_map, sizeof(prev_map));
>> +
>> + if (spi_nor_parse_sfdp(nor, &sfdp_params))
>> + /* restore previous erase map */
>> + memcpy(&nor->erase_map, &prev_map,
>> + sizeof(nor->erase_map));
>> + else
>> memcpy(params, &sfdp_params, sizeof(*params));
>> - }
>> }
>>
>> return 0;
>> @@ -2668,29 +3104,103 @@ static int spi_nor_select_pp(struct spi_nor *nor,
>> return 0;
>> }
>>
>> -static int spi_nor_select_erase(struct spi_nor *nor,
>> - const struct flash_info *info)
>> +/*
>> + * spi_nor_select_uniform_erase() - select optimum uniform erase type
>> + * @map: the erase map of the SPI NOR
>> + * @wanted_size: the erase type size to search for. Contains the value of
>> + * info->sector_size or of the "small sector" size in case
>> + * CONFIG_MTD_SPI_NOR_USE_4K_SECTORS is defined.
>> + *
>> + * Once the optimum uniform sector erase command is found, disable all
>> +the
>> + * other.
>> + *
>> + * Return: pointer to erase type on success, NULL otherwise.
>> + */
>> +static const struct spi_nor_erase_type *
>> +spi_nor_select_uniform_erase(struct spi_nor_erase_map *map,
>> + const u32 wanted_size)
>> {
>> - struct mtd_info *mtd = &nor->mtd;
>> + const struct spi_nor_erase_type *tested_erase, *erase = NULL;
>> + int i;
>> + u8 uniform_erase_type = map->uniform_erase_type;
>>
>> - /* Do nothing if already configured from SFDP. */
>> - if (mtd->erasesize)
>> - return 0;
>> + for (i = SNOR_ERASE_TYPE_MAX - 1; i >= 0; i--) {
>> + if (!(uniform_erase_type & BIT(i)))
>> + continue;
>> +
>> + tested_erase = &map->erase_type[i];
>> +
>> + /*
>> + * If the current erase size is the one, stop here:
>> + * we have found the right uniform Sector Erase command.
>> + */
>> + if (tested_erase->size == wanted_size) {
>> + erase = tested_erase;
>> + break;
>> + }
>>
>> + /*
>> + * Otherwise, the current erase size is still a valid canditate.
>> + * Select the biggest valid candidate.
>> + */
>> + if (!erase && tested_erase->size)
>> + erase = tested_erase;
>> + /* keep iterating to find the wanted_size */
>> + }
>> +
>> + if (!erase)
>> + 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);
>> + return erase;
>> +}
>> +
>> +static int spi_nor_select_erase(struct spi_nor *nor, u32 wanted_size) {
>> + struct spi_nor_erase_map *map = &nor->erase_map;
>> + const struct spi_nor_erase_type *erase = NULL;
>> + struct mtd_info *mtd = &nor->mtd;
>> + int i;
>> +
>> + /*
>> + * The previous implementation handling Sector Erase commands
>> assumed
>> + * that the SPI flash memory has an uniform layout then used only one
>> + * of the supported erase sizes for all Sector Erase commands.
>> + * So to be backward compatible, the new implementation also tries to
>> + * manage the SPI flash memory as uniform with a single erase sector
>> + * size, when possible.
>> + */
>> #ifdef CONFIG_MTD_SPI_NOR_USE_4K_SECTORS
>> /* prefer "small sector" erase if possible */
>> - if (info->flags & SECT_4K) {
>> - nor->erase_opcode = SPINOR_OP_BE_4K;
>> - mtd->erasesize = 4096;
>> - } else if (info->flags & SECT_4K_PMC) {
>> - nor->erase_opcode = SPINOR_OP_BE_4K_PMC;
>> - mtd->erasesize = 4096;
>> - } else
>> + wanted_size = 4096u;
>> #endif
>> - {
>> - nor->erase_opcode = SPINOR_OP_SE;
>> - mtd->erasesize = info->sector_size;
>> +
>> + if (spi_nor_has_uniform_erase(nor)) {
>> + erase = spi_nor_select_uniform_erase(map, wanted_size);
>> + if (!erase)
>> + return -EINVAL;
>> + nor->erase_opcode = erase->opcode;
>> + mtd->erasesize = erase->size;
>> + return 0;
>> }
>> +
>> + /*
>> + * For non-uniform SPI flash memory, set mtd->erasesize to the
>> + * maximum erase sector size. No need to set nor->erase_opcode.
>> + */
>> + for (i = SNOR_ERASE_TYPE_MAX - 1; i >= 0; i--) {
>> + if (map->erase_type[i].size) {
>> + erase = &map->erase_type[i];
>> + break;
>> + }
>> + }
>> +
>> + if (!erase)
>> + return -EINVAL;
>> +
>> + mtd->erasesize = erase->size;
>> return 0;
>> }
>>
>> @@ -2737,7 +3247,7 @@ static int spi_nor_setup(struct spi_nor *nor, const
>> struct flash_info *info,
>> }
>>
>> /* Select the Sector Erase command. */
>> - err = spi_nor_select_erase(nor, info);
>> + err = spi_nor_select_erase(nor, info->sector_size);
>> if (err) {
>> dev_err(nor->dev,
>> "can't select erase settings supported by both the SPI
>> controller and memory.\n"); diff --git a/include/linux/mtd/spi-nor.h
>> b/include/linux/mtd/spi-nor.h index 09a10fd..a873a0b 100644
>> --- a/include/linux/mtd/spi-nor.h
>> +++ b/include/linux/mtd/spi-nor.h
>> @@ -240,6 +240,94 @@ enum spi_nor_option_flags { };
>>
>> /**
>> + * struct spi_nor_erase_type - Structure to describe a SPI NOR erase type
>> + * @size: the size of the sector/block erased by the erase type.
>> + * JEDEC JESD216B imposes erase sizes to be a power of 2.
>> + * @size_shift: @size is a power of 2, the shift is stored in
>> + * @size_shift.
>> + * @size_mask: the size mask based on @size_shift.
>> + * @opcode: the SPI command op code to erase the sector/block.
>> + * @idx: Erase Type index as sorted in the Basic Flash Parameter
>> + * Table. It will be used to synchronize the supported
>> + * Erase Types with the ones identified in the SFDP
>> + * optional tables.
>> + */
>> +struct spi_nor_erase_type {
>> + u32 size;
>> + u32 size_shift;
>> + u32 size_mask;
>> + u8 opcode;
>> + u8 idx;
>> +};
>> +
>> +/**
>> + * struct spi_nor_erase_command - Used for non-uniform erases
>> + * The structure is used to describe a list of erase commands to be
>> +executed
>> + * once we validate that the erase can be performed. The elements in
>> +the list
>> + * are run-length encoded.
>> + * @list: for inclusion into the list of erase commands.
>> + * @count: how many times the same erase command should be
>> + * consecutively used.
>> + * @size: the size of the sector/block erased by the command.
>> + * @opcode: the SPI command op code to erase the sector/block.
>> + */
>> +struct spi_nor_erase_command {
>> + struct list_head list;
>> + u32 count;
>> + u32 size;
>> + u8 opcode;
>> +};
>> +
>> +/**
>> + * 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.
>> + */
>> +struct spi_nor_erase_region {
>> + u64 offset;
>> + u64 size;
>> +};
>> +
>> +#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
>> + * @regions: array of erase regions. The regions are consecutive in
>> + * address space. Walking through the regions is done
>> + * incrementally.
>> + * @uniform_region: a pre-allocated erase region for SPI NOR with a uniform
>> + * sector size (legacy implementation).
>> + * @erase_type: an array of erase types shared by all the regions.
>> + * 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.
>> + */
>> +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;
>> +};
>> +
>> +/**
>> * struct flash_info - Forward declaration of a structure used internally by
>> * spi_nor_scan()
>> */
>> @@ -263,6 +351,7 @@ struct flash_info;
>> * @write_proto: the SPI protocol for write operations
>> * @reg_proto the SPI protocol for read_reg/write_reg/erase
>> operations
>> * @cmd_buf: used by the write_reg
>> + * @erase_map: the erase map of the SPI NOR
>> * @prepare: [OPTIONAL] do some preparations for the
>> * read/write/erase/lock/unlock operations
>> * @unprepare: [OPTIONAL] do some post work after the
>> @@ -298,6 +387,7 @@ struct spi_nor {
>> bool sst_write_second;
>> u32 flags;
>> u8 cmd_buf[SPI_NOR_MAX_CMD_SIZE];
>> + struct spi_nor_erase_map erase_map;
>>
>> int (*prepare)(struct spi_nor *nor, enum spi_nor_ops ops);
>> void (*unprepare)(struct spi_nor *nor, enum spi_nor_ops ops); @@ -
>> 318,6 +408,23 @@ struct spi_nor {
>> void *priv;
>> };
>>
>> +static u64 __maybe_unused
>> +spi_nor_region_is_last(const struct spi_nor_erase_region *region) {
>> + return region->offset & SNOR_LAST_REGION; }
>> +
>> +static u64 __maybe_unused
>> +spi_nor_region_end(const struct spi_nor_erase_region *region) {
>> + return (region->offset & ~SNOR_ERASE_FLAGS_MASK) + region->size; }
>> +
>> +static bool __maybe_unused spi_nor_has_uniform_erase(const struct
>> +spi_nor *nor) {
>> + return !!nor->erase_map.uniform_erase_type;
>> +}
>> +
>> static inline void spi_nor_set_flash_node(struct spi_nor *nor,
>> struct device_node *np)
>> {
>> --
>> 2.9.4
>>
>>
>> ______________________________________________________
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