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[PATCH 11/12] nvmem: mxs-ocotp: remove nvmem regmap dependency

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  [PATCH 11/12] nvmem: mxs-ocotp: remove nvmem regmap dependency Srinivas Kandagatla <srinivas.kandagatla@linaro.org> - 2016-04-24 21:30 +0200
    Re: [PATCH 11/12] nvmem: mxs-ocotp: remove nvmem regmap dependency Stefan Wahren <stefan.wahren@i2se.com> - 2016-04-28 09:00 +0200

#1385871 — [PATCH 11/12] nvmem: mxs-ocotp: 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>
---
 drivers/nvmem/mxs-ocotp.c | 79 +++++++++++++----------------------------------
 1 file changed, 21 insertions(+), 58 deletions(-)

diff --git a/drivers/nvmem/mxs-ocotp.c b/drivers/nvmem/mxs-ocotp.c
index 8ba19bb..3bf962c 100644
--- a/drivers/nvmem/mxs-ocotp.c
+++ b/drivers/nvmem/mxs-ocotp.c
@@ -66,11 +66,10 @@ static int mxs_ocotp_wait(struct mxs_ocotp *otp)
 	return 0;
 }
 
-static int mxs_ocotp_read(void *context, const void *reg, size_t reg_size,
-			  void *val, size_t val_size)
+static int mxs_ocotp_read(void *context, unsigned int offset,
+			  void *val, size_t bytes)
 {
 	struct mxs_ocotp *otp = context;
-	unsigned int offset = *(u32 *)reg;
 	u32 *buf = val;
 	int ret;
 
@@ -94,17 +93,16 @@ static int mxs_ocotp_read(void *context, const void *reg, size_t reg_size,
 	if (ret)
 		goto close_banks;
 
-	while (val_size) {
+	while (bytes) {
 		if ((offset < OCOTP_DATA_OFFSET) || (offset % 16)) {
 			/* fill up non-data register */
-			*buf = 0;
+			*buf++ = 0;
 		} else {
-			*buf = readl(otp->base + offset);
+			*buf++ = readl(otp->base + offset);
 		}
 
-		buf++;
-		val_size--;
-		offset += reg_size;
+		bytes -= 4;
+		offset += 4;
 	}
 
 close_banks:
@@ -117,57 +115,28 @@ disable_clk:
 	return ret;
 }
 
-static int mxs_ocotp_write(void *context, const void *data, size_t count)
-{
-	/* We don't want to support writing */
-	return 0;
-}
-
-static bool mxs_ocotp_writeable_reg(struct device *dev, unsigned int reg)
-{
-	return false;
-}
-
 static struct nvmem_config ocotp_config = {
 	.name = "mxs-ocotp",
+	.stride = 16,
+	.word_size = 4,
 	.owner = THIS_MODULE,
 };
 
-static const struct regmap_range imx23_ranges[] = {
-	regmap_reg_range(OCOTP_DATA_OFFSET, 0x210),
-};
-
-static const struct regmap_access_table imx23_access = {
-	.yes_ranges = imx23_ranges,
-	.n_yes_ranges = ARRAY_SIZE(imx23_ranges),
-};
-
-static const struct regmap_range imx28_ranges[] = {
-	regmap_reg_range(OCOTP_DATA_OFFSET, 0x290),
-};
-
-static const struct regmap_access_table imx28_access = {
-	.yes_ranges = imx28_ranges,
-	.n_yes_ranges = ARRAY_SIZE(imx28_ranges),
+struct imx_data {
+	int max_reg;
 };
 
-static struct regmap_bus mxs_ocotp_bus = {
-	.read = mxs_ocotp_read,
-	.write = mxs_ocotp_write, /* make regmap_init() happy */
-	.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
-	.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
+static const struct imx_data imx23_data = {
+	.max_reg = 0x210,
 };
 
-static struct regmap_config mxs_ocotp_config = {
-	.reg_bits = 32,
-	.val_bits = 32,
-	.reg_stride = 16,
-	.writeable_reg = mxs_ocotp_writeable_reg,
+static const struct imx_data imx28_data = {
+	.max_reg = 0x290,
 };
 
 static const struct of_device_id mxs_ocotp_match[] = {
-	{ .compatible = "fsl,imx23-ocotp", .data = &imx23_access },
-	{ .compatible = "fsl,imx28-ocotp", .data = &imx28_access },
+	{ .compatible = "fsl,imx23-ocotp", .data = &imx23_data },
+	{ .compatible = "fsl,imx28-ocotp", .data = &imx23_data },
 	{ /* sentinel */},
 };
 MODULE_DEVICE_TABLE(of, mxs_ocotp_match);
@@ -175,6 +144,7 @@ MODULE_DEVICE_TABLE(of, mxs_ocotp_match);
 static int mxs_ocotp_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct imx_data *data;
 	struct mxs_ocotp *otp;
 	struct resource *res;
 	const struct of_device_id *match;
@@ -205,17 +175,10 @@ static int mxs_ocotp_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	access = match->data;
-	mxs_ocotp_config.rd_table = access;
-	mxs_ocotp_config.max_register = access->yes_ranges[0].range_max;
-
-	regmap = devm_regmap_init(dev, &mxs_ocotp_bus, otp, &mxs_ocotp_config);
-	if (IS_ERR(regmap)) {
-		dev_err(dev, "regmap init failed\n");
-		ret = PTR_ERR(regmap);
-		goto err_clk;
-	}
+	data = match->data;
 
+	ocotp_config.size = data->max_reg;
+	ocotp_config.priv = otp;
 	ocotp_config.dev = dev;
 	otp->nvmem = nvmem_register(&ocotp_config);
 	if (IS_ERR(otp->nvmem)) {
-- 
2.5.0

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#1389812

Hi Srinivas,

Am 24.04.2016 um 21:28 schrieb Srinivas Kandagatla:
> 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/mxs-ocotp.c | 79 +++++++++++++----------------------------------
>  1 file changed, 21 insertions(+), 58 deletions(-)
>
> diff --git a/drivers/nvmem/mxs-ocotp.c b/drivers/nvmem/mxs-ocotp.c
> index 8ba19bb..3bf962c 100644
> --- a/drivers/nvmem/mxs-ocotp.c
> +++ b/drivers/nvmem/mxs-ocotp.c

the include of regmap.h should also be removed.

> @@ -66,11 +66,10 @@ static int mxs_ocotp_wait(struct mxs_ocotp *otp)
>  	return 0;
>  }
>  
> -static int mxs_ocotp_read(void *context, const void *reg, size_t reg_size,
> -			  void *val, size_t val_size)
> +static int mxs_ocotp_read(void *context, unsigned int offset,
> +			  void *val, size_t bytes)
>  {
>  	struct mxs_ocotp *otp = context;
> -	unsigned int offset = *(u32 *)reg;
>  	u32 *buf = val;
>  	int ret;
>  
> @@ -94,17 +93,16 @@ static int mxs_ocotp_read(void *context, const void *reg, size_t reg_size,
>  	if (ret)
>  		goto close_banks;
>  
> -	while (val_size) {
> +	while (bytes) {
>  		if ((offset < OCOTP_DATA_OFFSET) || (offset % 16)) {
>  			/* fill up non-data register */
> -			*buf = 0;
> +			*buf++ = 0;
>  		} else {
> -			*buf = readl(otp->base + offset);
> +			*buf++ = readl(otp->base + offset);
>  		}
>  
> -		buf++;
> -		val_size--;
> -		offset += reg_size;
> +		bytes -= 4;
> +		offset += 4;

This change would also fix the buffer overflow but Stanislav's patch
should be applied before to get the fix in stable.

>  	}
>  
>  close_banks:
> @@ -117,57 +115,28 @@ disable_clk:
>  	return ret;
>  }
>  
> -static int mxs_ocotp_write(void *context, const void *data, size_t count)
> -{
> -	/* We don't want to support writing */
> -	return 0;
> -}
> -
> -static bool mxs_ocotp_writeable_reg(struct device *dev, unsigned int reg)
> -{
> -	return false;
> -}
> -
>  static struct nvmem_config ocotp_config = {
>  	.name = "mxs-ocotp",
> +	.stride = 16,
> +	.word_size = 4,
>  	.owner = THIS_MODULE,

.reg_read = mxs_ocotp_read,

>  };
>  
> -static const struct regmap_range imx23_ranges[] = {
> -	regmap_reg_range(OCOTP_DATA_OFFSET, 0x210),
> -};
> -
> -static const struct regmap_access_table imx23_access = {
> -	.yes_ranges = imx23_ranges,
> -	.n_yes_ranges = ARRAY_SIZE(imx23_ranges),
> -};
> -
> -static const struct regmap_range imx28_ranges[] = {
> -	regmap_reg_range(OCOTP_DATA_OFFSET, 0x290),
> -};
> -
> -static const struct regmap_access_table imx28_access = {
> -	.yes_ranges = imx28_ranges,
> -	.n_yes_ranges = ARRAY_SIZE(imx28_ranges),
> +struct imx_data {
struct mxs_data

These chips are named imx2x but the platform is mxs. Please don't ask why.
> +	int max_reg;
Since nvmem_config uses "size" instead of "max_reg" we better use "size"
here, too. This avoids confusion and potential issues see below.
>  };
>  
> -static struct regmap_bus mxs_ocotp_bus = {
> -	.read = mxs_ocotp_read,
> -	.write = mxs_ocotp_write, /* make regmap_init() happy */
> -	.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
> -	.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
> +static const struct imx_data imx23_data = {
static const struct mxs_data imx23_data
> +	.max_reg = 0x210,
.size = 0x220,
>  };
>  
> -static struct regmap_config mxs_ocotp_config = {
> -	.reg_bits = 32,
> -	.val_bits = 32,
> -	.reg_stride = 16,
> -	.writeable_reg = mxs_ocotp_writeable_reg,
> +static const struct imx_data imx28_data = {
static const struct mxs_data imx28_data
> +	.max_reg = 0x290,
.size = 0x2a0,
>  };
>  
>  static const struct of_device_id mxs_ocotp_match[] = {
> -	{ .compatible = "fsl,imx23-ocotp", .data = &imx23_access },
> -	{ .compatible = "fsl,imx28-ocotp", .data = &imx28_access },
> +	{ .compatible = "fsl,imx23-ocotp", .data = &imx23_data },
> +	{ .compatible = "fsl,imx28-ocotp", .data = &imx23_data },
.compatible = "fsl,imx28-ocotp", .data = &imx28_data
>  	{ /* sentinel */},
>  };
>  MODULE_DEVICE_TABLE(of, mxs_ocotp_match);
> @@ -175,6 +144,7 @@ MODULE_DEVICE_TABLE(of, mxs_ocotp_match);
>  static int mxs_ocotp_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> +	struct imx_data *data;
const struct mxs_data *data
>  	struct mxs_ocotp *otp;
>  	struct resource *res;
>  	const struct of_device_id *match;
> @@ -205,17 +175,10 @@ static int mxs_ocotp_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> -	access = match->data;
> -	mxs_ocotp_config.rd_table = access;
> -	mxs_ocotp_config.max_register = access->yes_ranges[0].range_max;
> -
> -	regmap = devm_regmap_init(dev, &mxs_ocotp_bus, otp, &mxs_ocotp_config);
> -	if (IS_ERR(regmap)) {
> -		dev_err(dev, "regmap init failed\n");
> -		ret = PTR_ERR(regmap);
> -		goto err_clk;
> -	}
> +	data = match->data;
>  
> +	ocotp_config.size = data->max_reg;
data->size

Regards
Stefan
> +	ocotp_config.priv = otp;
>  	ocotp_config.dev = dev;
>  	otp->nvmem = nvmem_register(&ocotp_config);
>  	if (IS_ERR(otp->nvmem)) {

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