[PATCH 10/12] nvmem: lpc18xx-eeprom: remove nvmem regmap dependency
Srinivas Kandagatla
srinivas.kandagatla at linaro.org
Sun Apr 24 12:28:14 PDT 2016
This patch moves to nvmem support in the driver to use callback
instead of regmap.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
---
drivers/nvmem/lpc18xx_eeprom.c | 94 ++++++++++++------------------------------
1 file changed, 26 insertions(+), 68 deletions(-)
diff --git a/drivers/nvmem/lpc18xx_eeprom.c b/drivers/nvmem/lpc18xx_eeprom.c
index 878fce7..c81ae4c 100644
--- a/drivers/nvmem/lpc18xx_eeprom.c
+++ b/drivers/nvmem/lpc18xx_eeprom.c
@@ -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)) {
--
2.5.0
More information about the linux-arm-kernel
mailing list