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110 lines
3.5 KiB
Diff
110 lines
3.5 KiB
Diff
From 943eadbdb11314b41eacbcc484dfb7f93e271ff4 Mon Sep 17 00:00:00 2001
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From: Sean Anderson <sean.anderson@seco.com>
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Date: Fri, 29 Apr 2022 17:27:00 +0100
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Subject: [PATCH] nvmem: sfp: Use regmap
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This converts the SFP driver to use regmap. This will allow easily
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supporting devices with different endians. We disallow byte-level
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access, as regmap_bulk_read doesn't support it (and it's unclear what
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the correct result would be when we have an endianness difference).
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Signed-off-by: Sean Anderson <sean.anderson@seco.com>
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Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
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Link: https://lore.kernel.org/r/20220429162701.2222-16-srinivas.kandagatla@linaro.org
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/nvmem/Kconfig | 1 +
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drivers/nvmem/layerscape-sfp.c | 30 ++++++++++++++++++++++--------
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2 files changed, 23 insertions(+), 8 deletions(-)
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--- a/drivers/nvmem/Kconfig
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+++ b/drivers/nvmem/Kconfig
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@@ -304,6 +304,7 @@ config NVMEM_LAYERSCAPE_SFP
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tristate "Layerscape SFP (Security Fuse Processor) support"
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depends on ARCH_LAYERSCAPE || COMPILE_TEST
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depends on HAS_IOMEM
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+ select REGMAP_MMIO
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help
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This driver provides support to read the eFuses on Freescale
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Layerscape SoC's. For example, the vendor provides a per part
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--- a/drivers/nvmem/layerscape-sfp.c
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+++ b/drivers/nvmem/layerscape-sfp.c
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@@ -13,15 +13,17 @@
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#include <linux/nvmem-provider.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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+#include <linux/regmap.h>
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#define LAYERSCAPE_SFP_OTP_OFFSET 0x0200
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struct layerscape_sfp_priv {
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- void __iomem *base;
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+ struct regmap *regmap;
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};
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struct layerscape_sfp_data {
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int size;
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+ enum regmap_endian endian;
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};
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static int layerscape_sfp_read(void *context, unsigned int offset, void *val,
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@@ -29,15 +31,16 @@ static int layerscape_sfp_read(void *con
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{
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struct layerscape_sfp_priv *priv = context;
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- memcpy_fromio(val, priv->base + LAYERSCAPE_SFP_OTP_OFFSET + offset,
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- bytes);
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-
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- return 0;
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+ return regmap_bulk_read(priv->regmap,
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+ LAYERSCAPE_SFP_OTP_OFFSET + offset, val,
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+ bytes / 4);
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}
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static struct nvmem_config layerscape_sfp_nvmem_config = {
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.name = "fsl-sfp",
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.reg_read = layerscape_sfp_read,
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+ .word_size = 4,
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+ .stride = 4,
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};
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static int layerscape_sfp_probe(struct platform_device *pdev)
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@@ -45,16 +48,26 @@ static int layerscape_sfp_probe(struct p
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const struct layerscape_sfp_data *data;
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struct layerscape_sfp_priv *priv;
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struct nvmem_device *nvmem;
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+ struct regmap_config config = { 0 };
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+ void __iomem *base;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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- priv->base = devm_platform_ioremap_resource(pdev, 0);
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- if (IS_ERR(priv->base))
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- return PTR_ERR(priv->base);
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+ base = devm_platform_ioremap_resource(pdev, 0);
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+ if (IS_ERR(base))
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+ return PTR_ERR(base);
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data = device_get_match_data(&pdev->dev);
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+ config.reg_bits = 32;
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+ config.reg_stride = 4;
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+ config.val_bits = 32;
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+ config.val_format_endian = data->endian;
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+ config.max_register = LAYERSCAPE_SFP_OTP_OFFSET + data->size - 4;
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+ priv->regmap = devm_regmap_init_mmio(&pdev->dev, base, &config);
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+ if (IS_ERR(priv->regmap))
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+ return PTR_ERR(priv->regmap);
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layerscape_sfp_nvmem_config.size = data->size;
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layerscape_sfp_nvmem_config.dev = &pdev->dev;
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@@ -67,6 +80,7 @@ static int layerscape_sfp_probe(struct p
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static const struct layerscape_sfp_data ls1028a_data = {
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.size = 0x88,
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+ .endian = REGMAP_ENDIAN_LITTLE,
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};
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static const struct of_device_id layerscape_sfp_dt_ids[] = {
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