diff options
author | Pratyush Yadav <p.yadav@ti.com> | 2021-06-25 22:17:13 +0300 |
---|---|---|
committer | Jagan Teki <jagan@amarulasolutions.com> | 2021-06-28 09:29:10 +0300 |
commit | 8702188ce5479729c81863680fb8ac7fffbd6b6a (patch) | |
tree | 3888999026859ff80bcc2c37aab1741ab3a78c7a | |
parent | e2e31fa6800f701cd370b886035c72d6116a8cb1 (diff) | |
download | u-boot-8702188ce5479729c81863680fb8ac7fffbd6b6a.tar.xz |
mtd: spi-nor-core: Introduce flash-specific fixup hooks
Sometimes the information in a flash's SFDP tables is wrong. Sometimes
some information just can't be expressed in the SFDP table. So,
introduce the fixup hooks to allow tailoring settings for a specific
flash.
Three hooks are added: default_init, post_sfdp, and post_bfpt. These
allow tweaking the flash settings at different point in the probe
sequence. Since the hooks reside in nor->info, set that value just
before the call to spi_nor_init_params().
The hooks and at what points they are executed mimics Linux's spi-nor
framework. One major difference is that Linux puts the struct
spi_nor_fixups in nor->info. This is not possible in U-Boot because the
spi-nor-ids list is shared between spi-nor-core.c and spi-nor-tiny.c.
Since spi-nor-tiny shouldn't have those fixup hooks populated, add a
separate function that lets flashes populate their fixup hooks.
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
-rw-r--r-- | drivers/mtd/spi/spi-nor-core.c | 78 | ||||
-rw-r--r-- | include/linux/mtd/spi-nor.h | 2 |
2 files changed, 77 insertions, 3 deletions
diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c index 312628c080..013a48d2ef 100644 --- a/drivers/mtd/spi/spi-nor-core.c +++ b/drivers/mtd/spi/spi-nor-core.c @@ -152,6 +152,31 @@ struct sfdp_bfpt { u32 dwords[BFPT_DWORD_MAX]; }; +/** + * struct spi_nor_fixups - SPI NOR fixup hooks + * @default_init: called after default flash parameters init. Used to tweak + * flash parameters when information provided by the flash_info + * table is incomplete or wrong. + * @post_bfpt: called after the BFPT table has been parsed + * @post_sfdp: called after SFDP has been parsed (is also called for SPI NORs + * that do not support RDSFDP). Typically used to tweak various + * parameters that could not be extracted by other means (i.e. + * when information provided by the SFDP/flash_info tables are + * incomplete or wrong). + * + * Those hooks can be used to tweak the SPI NOR configuration when the SFDP + * table is broken or not available. + */ +struct spi_nor_fixups { + void (*default_init)(struct spi_nor *nor); + int (*post_bfpt)(struct spi_nor *nor, + const struct sfdp_parameter_header *bfpt_header, + const struct sfdp_bfpt *bfpt, + struct spi_nor_flash_parameter *params); + void (*post_sfdp)(struct spi_nor *nor, + struct spi_nor_flash_parameter *params); +}; + static int spi_nor_read_write_reg(struct spi_nor *nor, struct spi_mem_op *op, void *buf) { @@ -1751,6 +1776,18 @@ static const struct sfdp_bfpt_erase sfdp_bfpt_erases[] = { static int spi_nor_hwcaps_read2cmd(u32 hwcaps); +static int +spi_nor_post_bfpt_fixups(struct spi_nor *nor, + const struct sfdp_parameter_header *bfpt_header, + const struct sfdp_bfpt *bfpt, + struct spi_nor_flash_parameter *params) +{ + if (nor->fixups && nor->fixups->post_bfpt) + return nor->fixups->post_bfpt(nor, bfpt_header, bfpt, params); + + return 0; +} + /** * spi_nor_parse_bfpt() - read and parse the Basic Flash Parameter Table. * @nor: pointer to a 'struct spi_nor' @@ -1889,7 +1926,8 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor, /* Stop here if not JESD216 rev A or later. */ if (bfpt_header->length < BFPT_DWORD_MAX) - return 0; + return spi_nor_post_bfpt_fixups(nor, bfpt_header, &bfpt, + params); /* Page size: this field specifies 'N' so the page size = 2^N bytes. */ params->page_size = bfpt.dwords[BFPT_DWORD(11)]; @@ -1922,7 +1960,7 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor, return -EINVAL; } - return 0; + return spi_nor_post_bfpt_fixups(nor, bfpt_header, &bfpt, params); } /** @@ -2085,6 +2123,29 @@ static int spi_nor_parse_sfdp(struct spi_nor *nor, } #endif /* SPI_FLASH_SFDP_SUPPORT */ +/** + * spi_nor_post_sfdp_fixups() - Updates the flash's parameters and settings + * after SFDP has been parsed (is also called for SPI NORs that do not + * support RDSFDP). + * @nor: pointer to a 'struct spi_nor' + * + * Typically used to tweak various parameters that could not be extracted by + * other means (i.e. when information provided by the SFDP/flash_info tables + * are incomplete or wrong). + */ +static void spi_nor_post_sfdp_fixups(struct spi_nor *nor, + struct spi_nor_flash_parameter *params) +{ + if (nor->fixups && nor->fixups->post_sfdp) + nor->fixups->post_sfdp(nor, params); +} + +static void spi_nor_default_init_fixups(struct spi_nor *nor) +{ + if (nor->fixups && nor->fixups->default_init) + nor->fixups->default_init(nor); +} + static int spi_nor_init_params(struct spi_nor *nor, const struct flash_info *info, struct spi_nor_flash_parameter *params) @@ -2164,6 +2225,8 @@ static int spi_nor_init_params(struct spi_nor *nor, } } + spi_nor_default_init_fixups(nor); + /* Override the parameters with data read from SFDP tables. */ nor->addr_width = 0; nor->mtd.erasesize = 0; @@ -2180,6 +2243,8 @@ static int spi_nor_init_params(struct spi_nor *nor, } } + spi_nor_post_sfdp_fixups(nor, params); + return 0; } @@ -2428,6 +2493,10 @@ static int spi_nor_init(struct spi_nor *nor) return 0; } +void spi_nor_set_fixups(struct spi_nor *nor) +{ +} + int spi_nor_scan(struct spi_nor *nor) { struct spi_nor_flash_parameter params; @@ -2476,6 +2545,10 @@ int spi_nor_scan(struct spi_nor *nor) info = spi_nor_read_id(nor); if (IS_ERR_OR_NULL(info)) return -ENOENT; + nor->info = info; + + spi_nor_set_fixups(nor); + /* Parse the Serial Flash Discoverable Parameters table. */ ret = spi_nor_init_params(nor, info, ¶ms); if (ret) @@ -2578,7 +2651,6 @@ int spi_nor_scan(struct spi_nor *nor) } /* Send all the required SPI flash commands to initialize device */ - nor->info = info; ret = spi_nor_init(nor); if (ret) return ret; diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h index 47a2eced69..b2e9e0895b 100644 --- a/include/linux/mtd/spi-nor.h +++ b/include/linux/mtd/spi-nor.h @@ -416,6 +416,7 @@ struct spi_flash { * @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 + * @fixups: flash-specific fixup hooks. * @prepare: [OPTIONAL] do some preparations for the * read/write/erase/lock/unlock operations * @unprepare: [OPTIONAL] do some post work after the @@ -457,6 +458,7 @@ struct spi_nor { bool sst_write_second; u32 flags; u8 cmd_buf[SPI_NOR_MAX_CMD_SIZE]; + struct spi_nor_fixups *fixups; int (*setup)(struct spi_nor *nor, const struct flash_info *info, const struct spi_nor_flash_parameter *params, |