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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: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Srinivas Kandagatla 2016-04-24 20:28:14 +01:00 committed by Greg Kroah-Hartman
parent 33e5e29cbb
commit 2e8d0733f3
1 changed files with 26 additions and 68 deletions
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94
drivers/nvmem/lpc18xx_eeprom.c
View File

@ -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)) {