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nvmem: sfp: Use regmap 

This converts the SFP driver to use regmap. This will allow easily
supporting devices with different endians. We disallow byte-level
access, as regmap_bulk_read doesn't support it (and it's unclear what
the correct result would be when we have an endianness difference).

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20220429162701.2222-16-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Anderson 2022-04-29 17:27:00 +01:00 committed by Greg Kroah-Hartman
parent 60ed1f7cec
commit 943eadbdb1
2 changed files with 23 additions and 8 deletions
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1
drivers/nvmem/Kconfig
View File

@ -304,6 +304,7 @@ config NVMEM_LAYERSCAPE_SFP
tristate "Layerscape SFP (Security Fuse Processor) support"
depends on ARCH_LAYERSCAPE || COMPILE_TEST
depends on HAS_IOMEM
select REGMAP_MMIO
help
This driver provides support to read the eFuses on Freescale
Layerscape SoC's. For example, the vendor provides a per part

30
drivers/nvmem/layerscape-sfp.c
View File

@ -13,15 +13,17 @@
#include <linux/nvmem-provider.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/regmap.h>
#define LAYERSCAPE_SFP_OTP_OFFSET 0x0200
struct layerscape_sfp_priv {
void __iomem *base;
struct regmap *regmap;
};
struct layerscape_sfp_data {
int size;
enum regmap_endian endian;
};
static int layerscape_sfp_read(void *context, unsigned int offset, void *val,
@ -29,15 +31,16 @@ static int layerscape_sfp_read(void *context, unsigned int offset, void *val,
{
struct layerscape_sfp_priv *priv = context;
memcpy_fromio(val, priv->base + LAYERSCAPE_SFP_OTP_OFFSET + offset,
bytes);
return 0;
return regmap_bulk_read(priv->regmap,
LAYERSCAPE_SFP_OTP_OFFSET + offset, val,
bytes / 4);
}
static struct nvmem_config layerscape_sfp_nvmem_config = {
.name = "fsl-sfp",
.reg_read = layerscape_sfp_read,
.word_size = 4,
.stride = 4,
};
static int layerscape_sfp_probe(struct platform_device *pdev)
@ -45,16 +48,26 @@ static int layerscape_sfp_probe(struct platform_device *pdev)
const struct layerscape_sfp_data *data;
struct layerscape_sfp_priv *priv;
struct nvmem_device *nvmem;
struct regmap_config config = { 0 };
void __iomem *base;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(priv->base))
return PTR_ERR(priv->base);
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
return PTR_ERR(base);
data = device_get_match_data(&pdev->dev);
config.reg_bits = 32;
config.reg_stride = 4;
config.val_bits = 32;
config.val_format_endian = data->endian;
config.max_register = LAYERSCAPE_SFP_OTP_OFFSET + data->size - 4;
priv->regmap = devm_regmap_init_mmio(&pdev->dev, base, &config);
if (IS_ERR(priv->regmap))
return PTR_ERR(priv->regmap);
layerscape_sfp_nvmem_config.size = data->size;
layerscape_sfp_nvmem_config.dev = &pdev->dev;
@ -67,6 +80,7 @@ static int layerscape_sfp_probe(struct platform_device *pdev)
static const struct layerscape_sfp_data ls1028a_data = {
.size = 0x88,
.endian = REGMAP_ENDIAN_LITTLE,
};
static const struct of_device_id layerscape_sfp_dt_ids[] = {