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Commit 2e8d0733 authored by Srinivas Kandagatla's avatar Srinivas Kandagatla Committed by Greg Kroah-Hartman
Browse files

nvmem: lpc18xx-eeprom: remove nvmem regmap dependency 



This patch moves to nvmem support in the driver to use callback
instead of regmap.

Signed-off-by: default avatarSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 33e5e29c

drivers/nvmem/lpc18xx_eeprom.c

+26 −68
Original line number Diff line number Diff line
@@ -16,7 +16,6 @@ 
#include <linux/module.h>

#include <linux/nvmem-provider.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>

#include <linux/reset.h>



/* Registers */
@@ -51,12 +50,7 @@ struct lpc18xx_eeprom_dev { 
	struct nvmem_device *nvmem;

	unsigned reg_bytes;

	unsigned val_bytes;

};



static struct regmap_config lpc18xx_regmap_config = {

	.reg_bits = 32,

	.reg_stride = 4,

	.val_bits = 32,

	int size;

};



static inline void lpc18xx_eeprom_writel(struct lpc18xx_eeprom_dev *eeprom,
@@ -95,30 +89,35 @@ static int lpc18xx_eeprom_busywait_until_prog(struct lpc18xx_eeprom_dev *eeprom) 
	return -ETIMEDOUT;

}



static int lpc18xx_eeprom_gather_write(void *context, const void *reg,

				       size_t reg_size, const void *val,

				       size_t val_size)

static int lpc18xx_eeprom_gather_write(void *context, unsigned int reg,

				       void *val, size_t bytes)

{

	struct lpc18xx_eeprom_dev *eeprom = context;

	unsigned int offset = *(u32 *)reg;

	unsigned int offset = reg;

	int ret;



	if (offset % lpc18xx_regmap_config.reg_stride)

	/*

	 * The last page contains the EEPROM initialization data and is not

	 * writable.

	 */

	if ((reg > eeprom->size - LPC18XX_EEPROM_PAGE_SIZE) ||

			(reg + bytes > eeprom->size - LPC18XX_EEPROM_PAGE_SIZE))

		return -EINVAL;





	lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_PWRDWN,

			      LPC18XX_EEPROM_PWRDWN_NO);



	/* Wait 100 us while the EEPROM wakes up */

	usleep_range(100, 200);



	while (val_size) {

	while (bytes) {

		writel(*(u32 *)val, eeprom->mem_base + offset);

		ret = lpc18xx_eeprom_busywait_until_prog(eeprom);

		if (ret < 0)

			return ret;



		val_size -= eeprom->val_bytes;

		bytes -= eeprom->val_bytes;

		val += eeprom->val_bytes;

		offset += eeprom->val_bytes;

	}
@@ -129,23 +128,10 @@ static int lpc18xx_eeprom_gather_write(void *context, const void *reg, 
	return 0;

}



static int lpc18xx_eeprom_write(void *context, const void *data, size_t count)

static int lpc18xx_eeprom_read(void *context, unsigned int offset,

			       void *val, size_t bytes)

{

	struct lpc18xx_eeprom_dev *eeprom = context;

	unsigned int offset = eeprom->reg_bytes;



	if (count <= offset)

		return -EINVAL;



	return lpc18xx_eeprom_gather_write(context, data, eeprom->reg_bytes,

					   data + offset, count - offset);

}



static int lpc18xx_eeprom_read(void *context, const void *reg, size_t reg_size,

			       void *val, size_t val_size)

{

	struct lpc18xx_eeprom_dev *eeprom = context;

	unsigned int offset = *(u32 *)reg;



	lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_PWRDWN,

			      LPC18XX_EEPROM_PWRDWN_NO);
@@ -153,9 +139,9 @@ static int lpc18xx_eeprom_read(void *context, const void *reg, size_t reg_size, 
	/* Wait 100 us while the EEPROM wakes up */

	usleep_range(100, 200);



	while (val_size) {

	while (bytes) {

		*(u32 *)val = readl(eeprom->mem_base + offset);

		val_size -= eeprom->val_bytes;

		bytes -= eeprom->val_bytes;

		val += eeprom->val_bytes;

		offset += eeprom->val_bytes;

	}
@@ -166,31 +152,13 @@ static int lpc18xx_eeprom_read(void *context, const void *reg, size_t reg_size, 
	return 0;

}



static struct regmap_bus lpc18xx_eeprom_bus = {

	.write = lpc18xx_eeprom_write,

	.gather_write = lpc18xx_eeprom_gather_write,

	.read = lpc18xx_eeprom_read,

	.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,

	.val_format_endian_default = REGMAP_ENDIAN_NATIVE,

};



static bool lpc18xx_eeprom_writeable_reg(struct device *dev, unsigned int reg)

{

	/*

	 * The last page contains the EEPROM initialization data and is not

	 * writable.

	 */

	return reg <= lpc18xx_regmap_config.max_register -

						LPC18XX_EEPROM_PAGE_SIZE;

}



static bool lpc18xx_eeprom_readable_reg(struct device *dev, unsigned int reg)

{

	return reg <= lpc18xx_regmap_config.max_register;

}



static struct nvmem_config lpc18xx_nvmem_config = {

	.name = "lpc18xx-eeprom",

	.stride = 4,

	.word_size = 4,

	.reg_read = lpc18xx_eeprom_read,

	.reg_write = lpc18xx_eeprom_gather_write,

	.owner = THIS_MODULE,

};
@@ -200,7 +168,6 @@ static int lpc18xx_eeprom_probe(struct platform_device *pdev) 
	struct device *dev = &pdev->dev;

	struct reset_control *rst;

	unsigned long clk_rate;

	struct regmap *regmap;

	struct resource *res;

	int ret;
@@ -243,8 +210,8 @@ static int lpc18xx_eeprom_probe(struct platform_device *pdev) 
		goto err_clk;

	}



	eeprom->val_bytes = lpc18xx_regmap_config.val_bits / BITS_PER_BYTE;

	eeprom->reg_bytes = lpc18xx_regmap_config.reg_bits / BITS_PER_BYTE;

	eeprom->val_bytes = 4;

	eeprom->reg_bytes = 4;



	/*

	 * Clock rate is generated by dividing the system bus clock by the
@@ -264,19 +231,10 @@ static int lpc18xx_eeprom_probe(struct platform_device *pdev) 
	lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_PWRDWN,

			      LPC18XX_EEPROM_PWRDWN_YES);



	lpc18xx_regmap_config.max_register = resource_size(res) - 1;

	lpc18xx_regmap_config.writeable_reg = lpc18xx_eeprom_writeable_reg;

	lpc18xx_regmap_config.readable_reg = lpc18xx_eeprom_readable_reg;



	regmap = devm_regmap_init(dev, &lpc18xx_eeprom_bus, eeprom,

				  &lpc18xx_regmap_config);

	if (IS_ERR(regmap)) {

		dev_err(dev, "regmap init failed: %ld\n", PTR_ERR(regmap));

		ret = PTR_ERR(regmap);

		goto err_clk;

	}



	eeprom->size = resource_size(res);

	lpc18xx_nvmem_config.size = resource_size(res);

	lpc18xx_nvmem_config.dev = dev;

	lpc18xx_nvmem_config.priv = eeprom;



	eeprom->nvmem = nvmem_register(&lpc18xx_nvmem_config);

	if (IS_ERR(eeprom->nvmem)) {