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Subject[PATCH 08/12] nvmem: mtk-efuse: remove nvmem regmap dependency
Date
This patch moves to nvmem support in the driver to use callback
instead of regmap.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
drivers/nvmem/Kconfig | 1 -
drivers/nvmem/mtk-efuse.c | 47 ++++++++++++++++++++++++++++++++---------------
2 files changed, 32 insertions(+), 16 deletions(-)

diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index 377bc21..c158712 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -48,7 +48,6 @@ config NVMEM_MXS_OCOTP
config MTK_EFUSE
tristate "Mediatek SoCs EFUSE support"
depends on ARCH_MEDIATEK || COMPILE_TEST
- select REGMAP_MMIO
help
This is a driver to access hardware related data like sensor
calibration, HDMI impedance etc.
diff --git a/drivers/nvmem/mtk-efuse.c b/drivers/nvmem/mtk-efuse.c
index 9c49369..32fd572 100644
--- a/drivers/nvmem/mtk-efuse.c
+++ b/drivers/nvmem/mtk-efuse.c
@@ -14,15 +14,35 @@

#include <linux/device.h>
#include <linux/module.h>
+#include <linux/io.h>
#include <linux/nvmem-provider.h>
#include <linux/platform_device.h>
-#include <linux/regmap.h>

-static struct regmap_config mtk_regmap_config = {
- .reg_bits = 32,
- .val_bits = 32,
- .reg_stride = 4,
-};
+static int mtk_reg_read(void *context,
+ unsigned int reg, void *_val, size_t bytes)
+{
+ void __iomem *base = context;
+ u32 *val = _val;
+ int i = 0, words = bytes / 4;
+
+ while (words--)
+ *val++ = readl(base + reg + (i++ * 4));
+
+ return 0;
+}
+
+static int mtk_reg_write(void *context,
+ unsigned int reg, void *_val, size_t bytes)
+{
+ void __iomem *base = context;
+ u32 *val = _val;
+ int i = 0, words = bytes / 4;
+
+ while (words--)
+ writel(*val++, base + reg + (i++ * 4));
+
+ return 0;
+}

static int mtk_efuse_probe(struct platform_device *pdev)
{
@@ -30,7 +50,6 @@ static int mtk_efuse_probe(struct platform_device *pdev)
struct resource *res;
struct nvmem_device *nvmem;
struct nvmem_config *econfig;
- struct regmap *regmap;
void __iomem *base;

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -42,14 +61,12 @@ static int mtk_efuse_probe(struct platform_device *pdev)
if (!econfig)
return -ENOMEM;

- mtk_regmap_config.max_register = resource_size(res) - 1;
-
- regmap = devm_regmap_init_mmio(dev, base, &mtk_regmap_config);
- if (IS_ERR(regmap)) {
- dev_err(dev, "regmap init failed\n");
- return PTR_ERR(regmap);
- }
-
+ econfig->stride = 4;
+ econfig->word_size = 4;
+ econfig->reg_read = mtk_reg_read;
+ econfig->reg_write = mtk_reg_write;
+ econfig->size = resource_size(res);
+ econfig->priv = base;
econfig->dev = dev;
econfig->owner = THIS_MODULE;
nvmem = nvmem_register(econfig);
--
2.5.0
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