RE: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP SPI NOR flash memories

From: Yogesh Narayan Gaur
Date: Tue Oct 16 2018 - 22:08:00 EST

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Hi Tudor,

> -----Original Message-----
> From: Cyrille Pitchen [mailto:cyrille.pitchen@xxxxxxxxxx]
> Sent: Tuesday, October 16, 2018 10:04 PM
> To: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>; Yogesh Narayan Gaur
> <yogeshnarayan.gaur@xxxxxxx>; marek.vasut@xxxxxxxxx;
> dwmw2@xxxxxxxxxxxxx; computersforpeace@xxxxxxxxx;
> boris.brezillon@xxxxxxxxxxx; richard@xxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx; nicolas.ferre@xxxxxxxxxxxxx;
> cyrille.pitchen@xxxxxxxxxxxxx; linux-mtd@xxxxxxxxxxxxxxxxxxx; linux-arm-
> kernel@xxxxxxxxxxxxxxxxxxx; Cristian.Birsan@xxxxxxxxxxxxx
> Subject: Re: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP SPI
> NOR flash memories
>
> Hi Tudor,
>
> Le 16/10/2018 Ã 17:14, Tudor Ambarus a ÃcritÂ:
> > 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.
> >
>
Actually there is no entry of s25fs512s in current spi-nor.c file.
For my connected flash part, jedec ID read points to s25fl512s. I have asked my board team to confirm the name of exact connected flash part.
When I check the data sheet of s25fs512s, it also points to the same Jedec ID information.
{ "s25fl512s", INFO(0x010220, 0x4d00, 256 * 1024, 256, ....}

But as stated earlier, if I skip reading SFDP or read using 1-1-1 protocol then read are always correct.
For 1-4-4 protocol read are wrong and on further debugging found that Read code of 0x6C is being send as opcode instead of 0xEC.

If I revert this patch, reads are working fine.

--
Regards
Yogesh Gaur

> s25fS512s supports both uniform and non uniform erase options but s25fL512s is
> always uniform. L is an old memory part, S is newer.
>
> Also, the 8th and 9th WORDs of the Basic Flash Parameter Table alone can't tell
> you whether or not the memory part can be non uniform.
> If the memory can be non uniform then the sector erase map table is mandatory,
> hence when the table is missing you know that your memory part is always
> uniform.
>
> Best regards,
>
> Cyrille
>
> > Thanks,
> > ta
> >
> > [1]
> > https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.
> >
> cypress.com%2Ffile%2F177971%2Fdownload&data=02%7C01%7Cyogeshn
> araya
> >
> n.gaur%40nxp.com%7C76e7e1555f4a4cda378008d63385480b%7C686ea1d3bc2
> b4c6f
> >
> a92cd99c5c301635%7C0%7C0%7C636753044876199155&sdata=cioC98EH
> OGlFbg
> > XPhoIIJ72K3JrNUnzA1pYhSB9jDwg%3D&reserved=0
> >
> >>
> >> --
> >> Regards
> >> Yogesh Gaur
> >>
> >>> -----Original Message-----
> >>> From: linux-mtd [mailto:linux-mtd-bounces@xxxxxxxxxxxxxxxxxxx] On
> >>> Behalf Of Tudor Ambarus
> >>> Sent: Tuesday, September 11, 2018 9:10 PM
> >>> To: marek.vasut@xxxxxxxxx; dwmw2@xxxxxxxxxxxxx;
> >>> computersforpeace@xxxxxxxxx; boris.brezillon@xxxxxxxxxxx;
> >>> richard@xxxxxx
> >>> Cc: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>; linux-
> >>> kernel@xxxxxxxxxxxxxxx; nicolas.ferre@xxxxxxxxxxxxx;
> >>> cyrille.pitchen@xxxxxxxxxxxxx; linux-mtd@xxxxxxxxxxxxxxxxxxx;
> >>> linux-arm- kernel@xxxxxxxxxxxxxxxxxxx; Cristian.Birsan@xxxxxxxxxxxxx
> >>> 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%2Fl
> >>> kml.or
> >>>
> g%2Flkml%2F2017%2F3%2F22%2F935&data=02%7C01%7Cyogeshnarayan.
> >>>
> gaur%40nxp.com%7C3c782e52b7fd4a8b9af008d617fd5154%7C686ea1d3bc2b4
> >>>
> c6fa92cd99c5c301635%7C0%7C0%7C636722774108718782&sdata=szyc%
> >>>
> 2FTumG6eYAmBd0oW3IL7v1yLh9E1SAZqL%2BCWczOA%3D&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@xxxxxxxxxxxxx>
> >>> Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
> >>> ---
> >>> 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
> >>>
> >>>
> >>> ______________________________________________________
> >>> Linux MTD discussion mailing list
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> >>>
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> >>
> >
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