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Commit f10aa369 authored by Boris Brezillon's avatar Boris Brezillon
Browse files

mtd: spi-nor: Avoid forward declaration of internal functions 



Reorganize the code to kill forward declarations of spi_nor_match_id()
macronix_quad_enable() and spi_nor_hwcaps_read2cmd().

Signed-off-by: default avatarBoris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: default avatarTudor Ambarus <tudor.ambarus@microchip.com>
parent 87f3ed18

drivers/mtd/spi-nor/spi-nor.c

+305 −311
Original line number Diff line number Diff line
@@ -289,8 +289,6 @@ struct flash_info { 


#define JEDEC_MFR(info)	((info)->id[0])



static const struct flash_info *spi_nor_match_id(const char *name);



/*

 * Read the status register, returning its value in the location

 * Return the status register value.
@@ -1395,7 +1393,247 @@ static int spi_nor_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) 
	return ret;

}



static int macronix_quad_enable(struct spi_nor *nor);

/*

 * Write status Register and configuration register with 2 bytes

 * The first byte will be written to the status register, while the

 * second byte will be written to the configuration register.

 * Return negative if error occurred.

 */

static int write_sr_cr(struct spi_nor *nor, u8 *sr_cr)

{

	int ret;



	write_enable(nor);



	ret = nor->write_reg(nor, SPINOR_OP_WRSR, sr_cr, 2);

	if (ret < 0) {

		dev_err(nor->dev,

			"error while writing configuration register\n");

		return -EINVAL;

	}



	ret = spi_nor_wait_till_ready(nor);

	if (ret) {

		dev_err(nor->dev,

			"timeout while writing configuration register\n");

		return ret;

	}



	return 0;

}



/**

 * macronix_quad_enable() - set QE bit in Status Register.

 * @nor:	pointer to a 'struct spi_nor'

 *

 * Set the Quad Enable (QE) bit in the Status Register.

 *

 * bit 6 of the Status Register is the QE bit for Macronix like QSPI memories.

 *

 * Return: 0 on success, -errno otherwise.

 */

static int macronix_quad_enable(struct spi_nor *nor)

{

	int ret, val;



	val = read_sr(nor);

	if (val < 0)

		return val;

	if (val & SR_QUAD_EN_MX)

		return 0;



	write_enable(nor);



	write_sr(nor, val | SR_QUAD_EN_MX);



	ret = spi_nor_wait_till_ready(nor);

	if (ret)

		return ret;



	ret = read_sr(nor);

	if (!(ret > 0 && (ret & SR_QUAD_EN_MX))) {

		dev_err(nor->dev, "Macronix Quad bit not set\n");

		return -EINVAL;

	}



	return 0;

}



/**

 * spansion_quad_enable() - set QE bit in Configuraiton Register.

 * @nor:	pointer to a 'struct spi_nor'

 *

 * Set the Quad Enable (QE) bit in the Configuration Register.

 * This function is kept for legacy purpose because it has been used for a

 * long time without anybody complaining but it should be considered as

 * deprecated and maybe buggy.

 * First, this function doesn't care about the previous values of the Status

 * and Configuration Registers when it sets the QE bit (bit 1) in the

 * Configuration Register: all other bits are cleared, which may have unwanted

 * side effects like removing some block protections.

 * Secondly, it uses the Read Configuration Register (35h) instruction though

 * some very old and few memories don't support this instruction. If a pull-up

 * resistor is present on the MISO/IO1 line, we might still be able to pass the

 * "read back" test because the QSPI memory doesn't recognize the command,

 * so leaves the MISO/IO1 line state unchanged, hence read_cr() returns 0xFF.

 *

 * bit 1 of the Configuration Register is the QE bit for Spansion like QSPI

 * memories.

 *

 * Return: 0 on success, -errno otherwise.

 */

static int spansion_quad_enable(struct spi_nor *nor)

{

	u8 sr_cr[2] = {0, CR_QUAD_EN_SPAN};

	int ret;



	ret = write_sr_cr(nor, sr_cr);

	if (ret)

		return ret;



	/* read back and check it */

	ret = read_cr(nor);

	if (!(ret > 0 && (ret & CR_QUAD_EN_SPAN))) {

		dev_err(nor->dev, "Spansion Quad bit not set\n");

		return -EINVAL;

	}



	return 0;

}



/**

 * spansion_no_read_cr_quad_enable() - set QE bit in Configuration Register.

 * @nor:	pointer to a 'struct spi_nor'

 *

 * Set the Quad Enable (QE) bit in the Configuration Register.

 * This function should be used with QSPI memories not supporting the Read

 * Configuration Register (35h) instruction.

 *

 * bit 1 of the Configuration Register is the QE bit for Spansion like QSPI

 * memories.

 *

 * Return: 0 on success, -errno otherwise.

 */

static int spansion_no_read_cr_quad_enable(struct spi_nor *nor)

{

	u8 sr_cr[2];

	int ret;



	/* Keep the current value of the Status Register. */

	ret = read_sr(nor);

	if (ret < 0) {

		dev_err(nor->dev, "error while reading status register\n");

		return -EINVAL;

	}

	sr_cr[0] = ret;

	sr_cr[1] = CR_QUAD_EN_SPAN;



	return write_sr_cr(nor, sr_cr);

}



/**

 * spansion_read_cr_quad_enable() - set QE bit in Configuration Register.

 * @nor:	pointer to a 'struct spi_nor'

 *

 * Set the Quad Enable (QE) bit in the Configuration Register.

 * This function should be used with QSPI memories supporting the Read

 * Configuration Register (35h) instruction.

 *

 * bit 1 of the Configuration Register is the QE bit for Spansion like QSPI

 * memories.

 *

 * Return: 0 on success, -errno otherwise.

 */

static int spansion_read_cr_quad_enable(struct spi_nor *nor)

{

	struct device *dev = nor->dev;

	u8 sr_cr[2];

	int ret;



	/* Check current Quad Enable bit value. */

	ret = read_cr(nor);

	if (ret < 0) {

		dev_err(dev, "error while reading configuration register\n");

		return -EINVAL;

	}



	if (ret & CR_QUAD_EN_SPAN)

		return 0;



	sr_cr[1] = ret | CR_QUAD_EN_SPAN;



	/* Keep the current value of the Status Register. */

	ret = read_sr(nor);

	if (ret < 0) {

		dev_err(dev, "error while reading status register\n");

		return -EINVAL;

	}

	sr_cr[0] = ret;



	ret = write_sr_cr(nor, sr_cr);

	if (ret)

		return ret;



	/* Read back and check it. */

	ret = read_cr(nor);

	if (!(ret > 0 && (ret & CR_QUAD_EN_SPAN))) {

		dev_err(nor->dev, "Spansion Quad bit not set\n");

		return -EINVAL;

	}



	return 0;

}



/**

 * sr2_bit7_quad_enable() - set QE bit in Status Register 2.

 * @nor:	pointer to a 'struct spi_nor'

 *

 * Set the Quad Enable (QE) bit in the Status Register 2.

 *

 * This is one of the procedures to set the QE bit described in the SFDP

 * (JESD216 rev B) specification but no manufacturer using this procedure has

 * been identified yet, hence the name of the function.

 *

 * Return: 0 on success, -errno otherwise.

 */

static int sr2_bit7_quad_enable(struct spi_nor *nor)

{

	u8 sr2;

	int ret;



	/* Check current Quad Enable bit value. */

	ret = nor->read_reg(nor, SPINOR_OP_RDSR2, &sr2, 1);

	if (ret)

		return ret;

	if (sr2 & SR2_QUAD_EN_BIT7)

		return 0;



	/* Update the Quad Enable bit. */

	sr2 |= SR2_QUAD_EN_BIT7;



	write_enable(nor);



	ret = nor->write_reg(nor, SPINOR_OP_WRSR2, &sr2, 1);

	if (ret < 0) {

		dev_err(nor->dev, "error while writing status register 2\n");

		return -EINVAL;

	}



	ret = spi_nor_wait_till_ready(nor);

	if (ret < 0) {

		dev_err(nor->dev, "timeout while writing status register 2\n");

		return ret;

	}



	/* Read back and check it. */

	ret = nor->read_reg(nor, SPINOR_OP_RDSR2, &sr2, 1);

	if (!(ret > 0 && (sr2 & SR2_QUAD_EN_BIT7))) {

		dev_err(nor->dev, "SR2 Quad bit not set\n");

		return -EINVAL;

	}



	return 0;

}



/* Used when the "_ext_id" is two bytes at most */

#define INFO(_jedec_id, _ext_id, _sector_size, _n_sectors, _flags)	\
@@ -2002,249 +2240,7 @@ static int spi_nor_write(struct mtd_info *mtd, loff_t to, size_t len, 
	return ret;

}



/**

 * macronix_quad_enable() - set QE bit in Status Register.

 * @nor:	pointer to a 'struct spi_nor'

 *

 * Set the Quad Enable (QE) bit in the Status Register.

 *

 * bit 6 of the Status Register is the QE bit for Macronix like QSPI memories.

 *

 * Return: 0 on success, -errno otherwise.

 */

static int macronix_quad_enable(struct spi_nor *nor)

{

	int ret, val;



	val = read_sr(nor);

	if (val < 0)

		return val;

	if (val & SR_QUAD_EN_MX)

		return 0;



	write_enable(nor);



	write_sr(nor, val | SR_QUAD_EN_MX);



	ret = spi_nor_wait_till_ready(nor);

	if (ret)

		return ret;



	ret = read_sr(nor);

	if (!(ret > 0 && (ret & SR_QUAD_EN_MX))) {

		dev_err(nor->dev, "Macronix Quad bit not set\n");

		return -EINVAL;

	}



	return 0;

}



/*

 * Write status Register and configuration register with 2 bytes

 * The first byte will be written to the status register, while the

 * second byte will be written to the configuration register.

 * Return negative if error occurred.

 */

static int write_sr_cr(struct spi_nor *nor, u8 *sr_cr)

{

	int ret;



	write_enable(nor);



	ret = nor->write_reg(nor, SPINOR_OP_WRSR, sr_cr, 2);

	if (ret < 0) {

		dev_err(nor->dev,

			"error while writing configuration register\n");

		return -EINVAL;

	}



	ret = spi_nor_wait_till_ready(nor);

	if (ret) {

		dev_err(nor->dev,

			"timeout while writing configuration register\n");

		return ret;

	}



	return 0;

}



/**

 * spansion_quad_enable() - set QE bit in Configuraiton Register.

 * @nor:	pointer to a 'struct spi_nor'

 *

 * Set the Quad Enable (QE) bit in the Configuration Register.

 * This function is kept for legacy purpose because it has been used for a

 * long time without anybody complaining but it should be considered as

 * deprecated and maybe buggy.

 * First, this function doesn't care about the previous values of the Status

 * and Configuration Registers when it sets the QE bit (bit 1) in the

 * Configuration Register: all other bits are cleared, which may have unwanted

 * side effects like removing some block protections.

 * Secondly, it uses the Read Configuration Register (35h) instruction though

 * some very old and few memories don't support this instruction. If a pull-up

 * resistor is present on the MISO/IO1 line, we might still be able to pass the

 * "read back" test because the QSPI memory doesn't recognize the command,

 * so leaves the MISO/IO1 line state unchanged, hence read_cr() returns 0xFF.

 *

 * bit 1 of the Configuration Register is the QE bit for Spansion like QSPI

 * memories.

 *

 * Return: 0 on success, -errno otherwise.

 */

static int spansion_quad_enable(struct spi_nor *nor)

{

	u8 sr_cr[2] = {0, CR_QUAD_EN_SPAN};

	int ret;



	ret = write_sr_cr(nor, sr_cr);

	if (ret)

		return ret;



	/* read back and check it */

	ret = read_cr(nor);

	if (!(ret > 0 && (ret & CR_QUAD_EN_SPAN))) {

		dev_err(nor->dev, "Spansion Quad bit not set\n");

		return -EINVAL;

	}



	return 0;

}



/**

 * spansion_no_read_cr_quad_enable() - set QE bit in Configuration Register.

 * @nor:	pointer to a 'struct spi_nor'

 *

 * Set the Quad Enable (QE) bit in the Configuration Register.

 * This function should be used with QSPI memories not supporting the Read

 * Configuration Register (35h) instruction.

 *

 * bit 1 of the Configuration Register is the QE bit for Spansion like QSPI

 * memories.

 *

 * Return: 0 on success, -errno otherwise.

 */

static int spansion_no_read_cr_quad_enable(struct spi_nor *nor)

{

	u8 sr_cr[2];

	int ret;



	/* Keep the current value of the Status Register. */

	ret = read_sr(nor);

	if (ret < 0) {

		dev_err(nor->dev, "error while reading status register\n");

		return -EINVAL;

	}

	sr_cr[0] = ret;

	sr_cr[1] = CR_QUAD_EN_SPAN;



	return write_sr_cr(nor, sr_cr);

}



/**

 * spansion_read_cr_quad_enable() - set QE bit in Configuration Register.

 * @nor:	pointer to a 'struct spi_nor'

 *

 * Set the Quad Enable (QE) bit in the Configuration Register.

 * This function should be used with QSPI memories supporting the Read

 * Configuration Register (35h) instruction.

 *

 * bit 1 of the Configuration Register is the QE bit for Spansion like QSPI

 * memories.

 *

 * Return: 0 on success, -errno otherwise.

 */

static int spansion_read_cr_quad_enable(struct spi_nor *nor)

{

	struct device *dev = nor->dev;

	u8 sr_cr[2];

	int ret;



	/* Check current Quad Enable bit value. */

	ret = read_cr(nor);

	if (ret < 0) {

		dev_err(dev, "error while reading configuration register\n");

		return -EINVAL;

	}



	if (ret & CR_QUAD_EN_SPAN)

		return 0;



	sr_cr[1] = ret | CR_QUAD_EN_SPAN;



	/* Keep the current value of the Status Register. */

	ret = read_sr(nor);

	if (ret < 0) {

		dev_err(dev, "error while reading status register\n");

		return -EINVAL;

	}

	sr_cr[0] = ret;



	ret = write_sr_cr(nor, sr_cr);

	if (ret)

		return ret;



	/* Read back and check it. */

	ret = read_cr(nor);

	if (!(ret > 0 && (ret & CR_QUAD_EN_SPAN))) {

		dev_err(nor->dev, "Spansion Quad bit not set\n");

		return -EINVAL;

	}



	return 0;

}



/**

 * sr2_bit7_quad_enable() - set QE bit in Status Register 2.

 * @nor:	pointer to a 'struct spi_nor'

 *

 * Set the Quad Enable (QE) bit in the Status Register 2.

 *

 * This is one of the procedures to set the QE bit described in the SFDP

 * (JESD216 rev B) specification but no manufacturer using this procedure has

 * been identified yet, hence the name of the function.

 *

 * Return: 0 on success, -errno otherwise.

 */

static int sr2_bit7_quad_enable(struct spi_nor *nor)

{

	u8 sr2;

	int ret;



	/* Check current Quad Enable bit value. */

	ret = nor->read_reg(nor, SPINOR_OP_RDSR2, &sr2, 1);

	if (ret)

		return ret;

	if (sr2 & SR2_QUAD_EN_BIT7)

		return 0;



	/* Update the Quad Enable bit. */

	sr2 |= SR2_QUAD_EN_BIT7;



	write_enable(nor);



	ret = nor->write_reg(nor, SPINOR_OP_WRSR2, &sr2, 1);

	if (ret < 0) {

		dev_err(nor->dev, "error while writing status register 2\n");

		return -EINVAL;

	}



	ret = spi_nor_wait_till_ready(nor);

	if (ret < 0) {

		dev_err(nor->dev, "timeout while writing status register 2\n");

		return ret;

	}



	/* Read back and check it. */

	ret = nor->read_reg(nor, SPINOR_OP_RDSR2, &sr2, 1);

	if (!(ret > 0 && (sr2 & SR2_QUAD_EN_BIT7))) {

		dev_err(nor->dev, "SR2 Quad bit not set\n");

		return -EINVAL;

	}



	return 0;

}



static int spi_nor_check(struct spi_nor *nor)

static int spi_nor_check(struct spi_nor *nor)

{

	if (!nor->dev || !nor->read || !nor->write ||

		!nor->read_reg || !nor->write_reg) {
@@ -2318,6 +2314,57 @@ spi_nor_set_pp_settings(struct spi_nor_pp_command *pp, 
	pp->proto = proto;

}



static int spi_nor_hwcaps2cmd(u32 hwcaps, const int table[][2], size_t size)

{

	size_t i;



	for (i = 0; i < size; i++)

		if (table[i][0] == (int)hwcaps)

			return table[i][1];



	return -EINVAL;

}



static int spi_nor_hwcaps_read2cmd(u32 hwcaps)

{

	static const int hwcaps_read2cmd[][2] = {

		{ SNOR_HWCAPS_READ,		SNOR_CMD_READ },

		{ SNOR_HWCAPS_READ_FAST,	SNOR_CMD_READ_FAST },

		{ SNOR_HWCAPS_READ_1_1_1_DTR,	SNOR_CMD_READ_1_1_1_DTR },

		{ SNOR_HWCAPS_READ_1_1_2,	SNOR_CMD_READ_1_1_2 },

		{ SNOR_HWCAPS_READ_1_2_2,	SNOR_CMD_READ_1_2_2 },

		{ SNOR_HWCAPS_READ_2_2_2,	SNOR_CMD_READ_2_2_2 },

		{ SNOR_HWCAPS_READ_1_2_2_DTR,	SNOR_CMD_READ_1_2_2_DTR },

		{ SNOR_HWCAPS_READ_1_1_4,	SNOR_CMD_READ_1_1_4 },

		{ SNOR_HWCAPS_READ_1_4_4,	SNOR_CMD_READ_1_4_4 },

		{ SNOR_HWCAPS_READ_4_4_4,	SNOR_CMD_READ_4_4_4 },

		{ SNOR_HWCAPS_READ_1_4_4_DTR,	SNOR_CMD_READ_1_4_4_DTR },

		{ SNOR_HWCAPS_READ_1_1_8,	SNOR_CMD_READ_1_1_8 },

		{ SNOR_HWCAPS_READ_1_8_8,	SNOR_CMD_READ_1_8_8 },

		{ SNOR_HWCAPS_READ_8_8_8,	SNOR_CMD_READ_8_8_8 },

		{ SNOR_HWCAPS_READ_1_8_8_DTR,	SNOR_CMD_READ_1_8_8_DTR },

	};



	return spi_nor_hwcaps2cmd(hwcaps, hwcaps_read2cmd,

				  ARRAY_SIZE(hwcaps_read2cmd));

}



static int spi_nor_hwcaps_pp2cmd(u32 hwcaps)

{

	static const int hwcaps_pp2cmd[][2] = {

		{ SNOR_HWCAPS_PP,		SNOR_CMD_PP },

		{ SNOR_HWCAPS_PP_1_1_4,		SNOR_CMD_PP_1_1_4 },

		{ SNOR_HWCAPS_PP_1_4_4,		SNOR_CMD_PP_1_4_4 },

		{ SNOR_HWCAPS_PP_4_4_4,		SNOR_CMD_PP_4_4_4 },

		{ SNOR_HWCAPS_PP_1_1_8,		SNOR_CMD_PP_1_1_8 },

		{ SNOR_HWCAPS_PP_1_8_8,		SNOR_CMD_PP_1_8_8 },

		{ SNOR_HWCAPS_PP_8_8_8,		SNOR_CMD_PP_8_8_8 },

	};



	return spi_nor_hwcaps2cmd(hwcaps, hwcaps_pp2cmd,

				  ARRAY_SIZE(hwcaps_pp2cmd));

}



/*

 * Serial Flash Discoverable Parameters (SFDP) parsing.

 */
@@ -2527,8 +2574,6 @@ static const struct sfdp_bfpt_erase sfdp_bfpt_erases[] = { 
	{BFPT_DWORD(9), 16},

};



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
@@ -3435,57 +3480,6 @@ static int spi_nor_init_params(struct spi_nor *nor, 
	return 0;

}



static int spi_nor_hwcaps2cmd(u32 hwcaps, const int table[][2], size_t size)

{

	size_t i;



	for (i = 0; i < size; i++)

		if (table[i][0] == (int)hwcaps)

			return table[i][1];



	return -EINVAL;

}



static int spi_nor_hwcaps_read2cmd(u32 hwcaps)

{

	static const int hwcaps_read2cmd[][2] = {

		{ SNOR_HWCAPS_READ,		SNOR_CMD_READ },

		{ SNOR_HWCAPS_READ_FAST,	SNOR_CMD_READ_FAST },

		{ SNOR_HWCAPS_READ_1_1_1_DTR,	SNOR_CMD_READ_1_1_1_DTR },

		{ SNOR_HWCAPS_READ_1_1_2,	SNOR_CMD_READ_1_1_2 },

		{ SNOR_HWCAPS_READ_1_2_2,	SNOR_CMD_READ_1_2_2 },

		{ SNOR_HWCAPS_READ_2_2_2,	SNOR_CMD_READ_2_2_2 },

		{ SNOR_HWCAPS_READ_1_2_2_DTR,	SNOR_CMD_READ_1_2_2_DTR },

		{ SNOR_HWCAPS_READ_1_1_4,	SNOR_CMD_READ_1_1_4 },

		{ SNOR_HWCAPS_READ_1_4_4,	SNOR_CMD_READ_1_4_4 },

		{ SNOR_HWCAPS_READ_4_4_4,	SNOR_CMD_READ_4_4_4 },

		{ SNOR_HWCAPS_READ_1_4_4_DTR,	SNOR_CMD_READ_1_4_4_DTR },

		{ SNOR_HWCAPS_READ_1_1_8,	SNOR_CMD_READ_1_1_8 },

		{ SNOR_HWCAPS_READ_1_8_8,	SNOR_CMD_READ_1_8_8 },

		{ SNOR_HWCAPS_READ_8_8_8,	SNOR_CMD_READ_8_8_8 },

		{ SNOR_HWCAPS_READ_1_8_8_DTR,	SNOR_CMD_READ_1_8_8_DTR },

	};



	return spi_nor_hwcaps2cmd(hwcaps, hwcaps_read2cmd,

				  ARRAY_SIZE(hwcaps_read2cmd));

}



static int spi_nor_hwcaps_pp2cmd(u32 hwcaps)

{

	static const int hwcaps_pp2cmd[][2] = {

		{ SNOR_HWCAPS_PP,		SNOR_CMD_PP },

		{ SNOR_HWCAPS_PP_1_1_4,		SNOR_CMD_PP_1_1_4 },

		{ SNOR_HWCAPS_PP_1_4_4,		SNOR_CMD_PP_1_4_4 },

		{ SNOR_HWCAPS_PP_4_4_4,		SNOR_CMD_PP_4_4_4 },

		{ SNOR_HWCAPS_PP_1_1_8,		SNOR_CMD_PP_1_1_8 },

		{ SNOR_HWCAPS_PP_1_8_8,		SNOR_CMD_PP_1_8_8 },

		{ SNOR_HWCAPS_PP_8_8_8,		SNOR_CMD_PP_8_8_8 },

	};



	return spi_nor_hwcaps2cmd(hwcaps, hwcaps_pp2cmd,

				  ARRAY_SIZE(hwcaps_pp2cmd));

}



static int spi_nor_select_read(struct spi_nor *nor,

			       const struct spi_nor_flash_parameter *params,

			       u32 shared_hwcaps)
@@ -3762,6 +3756,18 @@ void spi_nor_restore(struct spi_nor *nor) 
}

EXPORT_SYMBOL_GPL(spi_nor_restore);



static const struct flash_info *spi_nor_match_id(const char *name)

{

	const struct flash_info *id = spi_nor_ids;



	while (id->name) {

		if (!strcmp(name, id->name))

			return id;

		id++;

	}

	return NULL;

}



int spi_nor_scan(struct spi_nor *nor, const char *name,

		 const struct spi_nor_hwcaps *hwcaps)

{
@@ -3965,18 +3971,6 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, 
}

EXPORT_SYMBOL_GPL(spi_nor_scan);



static const struct flash_info *spi_nor_match_id(const char *name)

{

	const struct flash_info *id = spi_nor_ids;



	while (id->name) {

		if (!strcmp(name, id->name))

			return id;

		id++;

	}

	return NULL;

}



MODULE_LICENSE("GPL");

MODULE_AUTHOR("Huang Shijie <shijie8@gmail.com>");

MODULE_AUTHOR("Mike Lavender");