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Date: Sun, 25 Aug 2019 13:32:01 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: <Tudor.Ambarus@...rochip.com>
Cc: <marek.vasut@...il.com>, <vigneshr@...com>,
<miquel.raynal@...tlin.com>, <richard@....at>,
<linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] mtd: spi-nor: Regroup flash parameter and settings
On Fri, 23 Aug 2019 15:53:35 +0000
<Tudor.Ambarus@...rochip.com> wrote:
> From: Tudor Ambarus <tudor.ambarus@...rochip.com>
>
> The scope is to move all [FLASH-SPECIFIC] parameters and settings
> from 'struct spi_nor' to 'struct spi_nor_flash_parameter'.
>
> 'struct spi_nor_flash_parameter' describes the hardware capabilities
> and associated settings of the SPI NOR flash memory. It includes
> legacy flash parameters and settings that can be overwritten by the
> spi_nor_fixups hooks, or dynamically when parsing the JESD216
> Serial Flash Discoverable Parameters (SFDP) tables. All SFDP params
> and settings will fit inside 'struct spi_nor_flash_parameter'.
>
> Move spi_nor_hwcaps related code to avoid forward declarations.
> Add a forward declaration that we can't avoid: 'struct spi_nor' will
> be used in 'struct spi_nor_flash_parameter'.
>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>
> ---
> drivers/mtd/spi-nor/spi-nor.c | 65 ------------
> include/linux/mtd/spi-nor.h | 239 +++++++++++++++++++++++++++++-------------
> 2 files changed, 164 insertions(+), 140 deletions(-)
>
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index 0597cb8257b0..d35dc6a97521 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -40,71 +40,6 @@
> #define SPI_NOR_MAX_ID_LEN 6
> #define SPI_NOR_MAX_ADDR_WIDTH 4
>
> -struct spi_nor_read_command {
> - u8 num_mode_clocks;
> - u8 num_wait_states;
> - u8 opcode;
> - enum spi_nor_protocol proto;
> -};
> -
> -struct spi_nor_pp_command {
> - u8 opcode;
> - enum spi_nor_protocol proto;
> -};
> -
> -enum spi_nor_read_command_index {
> - SNOR_CMD_READ,
> - SNOR_CMD_READ_FAST,
> - SNOR_CMD_READ_1_1_1_DTR,
> -
> - /* Dual SPI */
> - SNOR_CMD_READ_1_1_2,
> - SNOR_CMD_READ_1_2_2,
> - SNOR_CMD_READ_2_2_2,
> - SNOR_CMD_READ_1_2_2_DTR,
> -
> - /* Quad SPI */
> - SNOR_CMD_READ_1_1_4,
> - SNOR_CMD_READ_1_4_4,
> - SNOR_CMD_READ_4_4_4,
> - SNOR_CMD_READ_1_4_4_DTR,
> -
> - /* Octal SPI */
> - SNOR_CMD_READ_1_1_8,
> - SNOR_CMD_READ_1_8_8,
> - SNOR_CMD_READ_8_8_8,
> - SNOR_CMD_READ_1_8_8_DTR,
> -
> - SNOR_CMD_READ_MAX
> -};
> -
> -enum spi_nor_pp_command_index {
> - SNOR_CMD_PP,
> -
> - /* Quad SPI */
> - SNOR_CMD_PP_1_1_4,
> - SNOR_CMD_PP_1_4_4,
> - SNOR_CMD_PP_4_4_4,
> -
> - /* Octal SPI */
> - SNOR_CMD_PP_1_1_8,
> - SNOR_CMD_PP_1_8_8,
> - SNOR_CMD_PP_8_8_8,
> -
> - SNOR_CMD_PP_MAX
> -};
> -
> -struct spi_nor_flash_parameter {
> - u64 size;
> - u32 page_size;
> -
> - struct spi_nor_hwcaps hwcaps;
> - struct spi_nor_read_command reads[SNOR_CMD_READ_MAX];
> - struct spi_nor_pp_command page_programs[SNOR_CMD_PP_MAX];
> -
> - int (*quad_enable)(struct spi_nor *nor);
> -};
> -
> struct sfdp_parameter_header {
> u8 id_lsb;
> u8 minor;
> diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
> index 3075ac73b171..77ba692d9348 100644
> --- a/include/linux/mtd/spi-nor.h
> +++ b/include/linux/mtd/spi-nor.h
> @@ -334,6 +334,165 @@ struct spi_nor_erase_map {
> };
>
> /**
> + * struct spi_nor_hwcaps - Structure for describing the hardware capabilies
> + * supported by the SPI controller (bus master).
> + * @mask: the bitmask listing all the supported hw capabilies
> + */
> +struct spi_nor_hwcaps {
> + u32 mask;
> +};
> +
> +/*
> + *(Fast) Read capabilities.
> + * MUST be ordered by priority: the higher bit position, the higher priority.
> + * As a matter of performances, it is relevant to use Octal SPI protocols first,
> + * then Quad SPI protocols before Dual SPI protocols, Fast Read and lastly
> + * (Slow) Read.
> + */
> +#define SNOR_HWCAPS_READ_MASK GENMASK(14, 0)
> +#define SNOR_HWCAPS_READ BIT(0)
> +#define SNOR_HWCAPS_READ_FAST BIT(1)
> +#define SNOR_HWCAPS_READ_1_1_1_DTR BIT(2)
> +
> +#define SNOR_HWCAPS_READ_DUAL GENMASK(6, 3)
> +#define SNOR_HWCAPS_READ_1_1_2 BIT(3)
> +#define SNOR_HWCAPS_READ_1_2_2 BIT(4)
> +#define SNOR_HWCAPS_READ_2_2_2 BIT(5)
> +#define SNOR_HWCAPS_READ_1_2_2_DTR BIT(6)
> +
> +#define SNOR_HWCAPS_READ_QUAD GENMASK(10, 7)
> +#define SNOR_HWCAPS_READ_1_1_4 BIT(7)
> +#define SNOR_HWCAPS_READ_1_4_4 BIT(8)
> +#define SNOR_HWCAPS_READ_4_4_4 BIT(9)
> +#define SNOR_HWCAPS_READ_1_4_4_DTR BIT(10)
> +
> +#define SNOR_HWCAPS_READ_OCTAL GENMASK(14, 11)
> +#define SNOR_HWCAPS_READ_1_1_8 BIT(11)
> +#define SNOR_HWCAPS_READ_1_8_8 BIT(12)
> +#define SNOR_HWCAPS_READ_8_8_8 BIT(13)
> +#define SNOR_HWCAPS_READ_1_8_8_DTR BIT(14)
> +
> +/*
> + * Page Program capabilities.
> + * MUST be ordered by priority: the higher bit position, the higher priority.
> + * Like (Fast) Read capabilities, Octal/Quad SPI protocols are preferred to the
> + * legacy SPI 1-1-1 protocol.
> + * Note that Dual Page Programs are not supported because there is no existing
> + * JEDEC/SFDP standard to define them. Also at this moment no SPI flash memory
> + * implements such commands.
> + */
> +#define SNOR_HWCAPS_PP_MASK GENMASK(22, 16)
> +#define SNOR_HWCAPS_PP BIT(16)
> +
> +#define SNOR_HWCAPS_PP_QUAD GENMASK(19, 17)
> +#define SNOR_HWCAPS_PP_1_1_4 BIT(17)
> +#define SNOR_HWCAPS_PP_1_4_4 BIT(18)
> +#define SNOR_HWCAPS_PP_4_4_4 BIT(19)
> +
> +#define SNOR_HWCAPS_PP_OCTAL GENMASK(22, 20)
> +#define SNOR_HWCAPS_PP_1_1_8 BIT(20)
> +#define SNOR_HWCAPS_PP_1_8_8 BIT(21)
> +#define SNOR_HWCAPS_PP_8_8_8 BIT(22)
> +
> +#define SNOR_HWCAPS_X_X_X (SNOR_HWCAPS_READ_2_2_2 | \
> + SNOR_HWCAPS_READ_4_4_4 | \
> + SNOR_HWCAPS_READ_8_8_8 | \
> + SNOR_HWCAPS_PP_4_4_4 | \
> + SNOR_HWCAPS_PP_8_8_8)
> +
> +#define SNOR_HWCAPS_DTR (SNOR_HWCAPS_READ_1_1_1_DTR | \
> + SNOR_HWCAPS_READ_1_2_2_DTR | \
> + SNOR_HWCAPS_READ_1_4_4_DTR | \
> + SNOR_HWCAPS_READ_1_8_8_DTR)
> +
> +#define SNOR_HWCAPS_ALL (SNOR_HWCAPS_READ_MASK | \
> + SNOR_HWCAPS_PP_MASK)
> +
> +struct spi_nor_read_command {
> + u8 num_mode_clocks;
> + u8 num_wait_states;
> + u8 opcode;
> + enum spi_nor_protocol proto;
> +};
> +
> +struct spi_nor_pp_command {
> + u8 opcode;
> + enum spi_nor_protocol proto;
> +};
> +
> +enum spi_nor_read_command_index {
> + SNOR_CMD_READ,
> + SNOR_CMD_READ_FAST,
> + SNOR_CMD_READ_1_1_1_DTR,
> +
> + /* Dual SPI */
> + SNOR_CMD_READ_1_1_2,
> + SNOR_CMD_READ_1_2_2,
> + SNOR_CMD_READ_2_2_2,
> + SNOR_CMD_READ_1_2_2_DTR,
> +
> + /* Quad SPI */
> + SNOR_CMD_READ_1_1_4,
> + SNOR_CMD_READ_1_4_4,
> + SNOR_CMD_READ_4_4_4,
> + SNOR_CMD_READ_1_4_4_DTR,
> +
> + /* Octal SPI */
> + SNOR_CMD_READ_1_1_8,
> + SNOR_CMD_READ_1_8_8,
> + SNOR_CMD_READ_8_8_8,
> + SNOR_CMD_READ_1_8_8_DTR,
> +
> + SNOR_CMD_READ_MAX
> +};
> +
> +enum spi_nor_pp_command_index {
> + SNOR_CMD_PP,
> +
> + /* Quad SPI */
> + SNOR_CMD_PP_1_1_4,
> + SNOR_CMD_PP_1_4_4,
> + SNOR_CMD_PP_4_4_4,
> +
> + /* Octal SPI */
> + SNOR_CMD_PP_1_1_8,
> + SNOR_CMD_PP_1_8_8,
> + SNOR_CMD_PP_8_8_8,
> +
> + SNOR_CMD_PP_MAX
> +};
> +
> +/* Forward declaration that will be used in 'struct spi_nor_flash_parameter' */
> +struct spi_nor;
> +
> +/**
> + * struct spi_nor_flash_parameter - SPI NOR flash parameters and settings.
> + * Includes legacy flash parameters and settings that can be overwritten
> + * by the spi_nor_fixups hooks, or dynamically when parsing the JESD216
> + * Serial Flash Discoverable Parameters (SFDP) tables.
> + *
> + * @size: the flash memory density in bytes.
> + * @page_size: the page size of the SPI NOR flash memory.
> + * @hwcaps: describes the read and page program hardware
> + * capabilities.
> + * @reads: read capabilities ordered by priority: the higher index
> + * in the array, the higher priority.
> + * @page_programs: page program capabilities ordered by priority: the
> + * higher index in the array, the higher priority.
> + * @quad_enable: enables SPI NOR quad mode.
> + */
> +struct spi_nor_flash_parameter {
> + u64 size;
> + u32 page_size;
> +
> + struct spi_nor_hwcaps hwcaps;
> + struct spi_nor_read_command reads[SNOR_CMD_READ_MAX];
> + struct spi_nor_pp_command page_programs[SNOR_CMD_PP_MAX];
> +
> + int (*quad_enable)(struct spi_nor *nor);
> +};
> +
> +/**
> * struct flash_info - Forward declaration of a structure used internally by
> * spi_nor_scan()
> */
> @@ -379,6 +538,10 @@ struct flash_info;
> * @quad_enable: [FLASH-SPECIFIC] enables SPI NOR quad mode
> * @clear_sr_bp: [FLASH-SPECIFIC] clears the Block Protection Bits from
> * the SPI NOR Status Register.
> + * @params: [FLASH-SPECIFIC] SPI-NOR flash parameters and settings.
> + * The structure includes legacy flash parameters and
> + * settings that can be overwritten by the spi_nor_fixups
> + * hooks, or dynamically when parsing the SFDP tables.
> * @priv: the private data
> */
> struct spi_nor {
> @@ -418,6 +581,7 @@ struct spi_nor {
> int (*flash_is_locked)(struct spi_nor *nor, loff_t ofs, uint64_t len);
> int (*quad_enable)(struct spi_nor *nor);
> int (*clear_sr_bp)(struct spi_nor *nor);
> + struct spi_nor_flash_parameter params;
>
> void *priv;
> };
> @@ -463,81 +627,6 @@ static inline struct device_node *spi_nor_get_flash_node(struct spi_nor *nor)
> }
>
> /**
> - * struct spi_nor_hwcaps - Structure for describing the hardware capabilies
> - * supported by the SPI controller (bus master).
> - * @mask: the bitmask listing all the supported hw capabilies
> - */
> -struct spi_nor_hwcaps {
> - u32 mask;
> -};
> -
> -/*
> - *(Fast) Read capabilities.
> - * MUST be ordered by priority: the higher bit position, the higher priority.
> - * As a matter of performances, it is relevant to use Octal SPI protocols first,
> - * then Quad SPI protocols before Dual SPI protocols, Fast Read and lastly
> - * (Slow) Read.
> - */
> -#define SNOR_HWCAPS_READ_MASK GENMASK(14, 0)
> -#define SNOR_HWCAPS_READ BIT(0)
> -#define SNOR_HWCAPS_READ_FAST BIT(1)
> -#define SNOR_HWCAPS_READ_1_1_1_DTR BIT(2)
> -
> -#define SNOR_HWCAPS_READ_DUAL GENMASK(6, 3)
> -#define SNOR_HWCAPS_READ_1_1_2 BIT(3)
> -#define SNOR_HWCAPS_READ_1_2_2 BIT(4)
> -#define SNOR_HWCAPS_READ_2_2_2 BIT(5)
> -#define SNOR_HWCAPS_READ_1_2_2_DTR BIT(6)
> -
> -#define SNOR_HWCAPS_READ_QUAD GENMASK(10, 7)
> -#define SNOR_HWCAPS_READ_1_1_4 BIT(7)
> -#define SNOR_HWCAPS_READ_1_4_4 BIT(8)
> -#define SNOR_HWCAPS_READ_4_4_4 BIT(9)
> -#define SNOR_HWCAPS_READ_1_4_4_DTR BIT(10)
> -
> -#define SNOR_HWCAPS_READ_OCTAL GENMASK(14, 11)
> -#define SNOR_HWCAPS_READ_1_1_8 BIT(11)
> -#define SNOR_HWCAPS_READ_1_8_8 BIT(12)
> -#define SNOR_HWCAPS_READ_8_8_8 BIT(13)
> -#define SNOR_HWCAPS_READ_1_8_8_DTR BIT(14)
> -
> -/*
> - * Page Program capabilities.
> - * MUST be ordered by priority: the higher bit position, the higher priority.
> - * Like (Fast) Read capabilities, Octal/Quad SPI protocols are preferred to the
> - * legacy SPI 1-1-1 protocol.
> - * Note that Dual Page Programs are not supported because there is no existing
> - * JEDEC/SFDP standard to define them. Also at this moment no SPI flash memory
> - * implements such commands.
> - */
> -#define SNOR_HWCAPS_PP_MASK GENMASK(22, 16)
> -#define SNOR_HWCAPS_PP BIT(16)
> -
> -#define SNOR_HWCAPS_PP_QUAD GENMASK(19, 17)
> -#define SNOR_HWCAPS_PP_1_1_4 BIT(17)
> -#define SNOR_HWCAPS_PP_1_4_4 BIT(18)
> -#define SNOR_HWCAPS_PP_4_4_4 BIT(19)
> -
> -#define SNOR_HWCAPS_PP_OCTAL GENMASK(22, 20)
> -#define SNOR_HWCAPS_PP_1_1_8 BIT(20)
> -#define SNOR_HWCAPS_PP_1_8_8 BIT(21)
> -#define SNOR_HWCAPS_PP_8_8_8 BIT(22)
> -
> -#define SNOR_HWCAPS_X_X_X (SNOR_HWCAPS_READ_2_2_2 | \
> - SNOR_HWCAPS_READ_4_4_4 | \
> - SNOR_HWCAPS_READ_8_8_8 | \
> - SNOR_HWCAPS_PP_4_4_4 | \
> - SNOR_HWCAPS_PP_8_8_8)
> -
> -#define SNOR_HWCAPS_DTR (SNOR_HWCAPS_READ_1_1_1_DTR | \
> - SNOR_HWCAPS_READ_1_2_2_DTR | \
> - SNOR_HWCAPS_READ_1_4_4_DTR | \
> - SNOR_HWCAPS_READ_1_8_8_DTR)
> -
> -#define SNOR_HWCAPS_ALL (SNOR_HWCAPS_READ_MASK | \
> - SNOR_HWCAPS_PP_MASK)
> -
> -/**
> * spi_nor_scan() - scan the SPI NOR
> * @nor: the spi_nor structure
> * @name: the chip type name
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