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>

diff --git a/drivers/nvmem/lpc18xx_eeprom.c b/drivers/nvmem/lpc18xx_eeprom.c
index 878fce789341c85785116f9bb00c69686ec8181a..c81ae4c6da74c64714d5da77bc7d53666c286562 100644 (file)
--- 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)) {