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140 lines
4.0 KiB
Diff
140 lines
4.0 KiB
Diff
From f78451012b9e159afdba31c3eb69f223a9f42adc Mon Sep 17 00:00:00 2001
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From: Michael Walle <michael@walle.cc>
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Date: Sun, 20 Feb 2022 15:15:23 +0000
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Subject: [PATCH] nvmem: add driver for Layerscape SFP (Security Fuse
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Processor)
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Add support for the Security Fuse Processor found on Layerscape SoCs.
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This driver implements basic read access.
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Signed-off-by: Michael Walle <michael@walle.cc>
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Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
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Link: https://lore.kernel.org/r/20220220151527.17216-10-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 | 12 +++++
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drivers/nvmem/Makefile | 2 +
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drivers/nvmem/layerscape-sfp.c | 89 ++++++++++++++++++++++++++++++++++
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3 files changed, 103 insertions(+)
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create mode 100644 drivers/nvmem/layerscape-sfp.c
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--- a/drivers/nvmem/Kconfig
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+++ b/drivers/nvmem/Kconfig
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@@ -300,4 +300,16 @@ config NVMEM_BRCM_NVRAM
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This driver provides support for Broadcom's NVRAM that can be accessed
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using I/O mapping.
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+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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+ 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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+ unique ID there.
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+
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+ This driver can also be built as a module. If so, the module
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+ will be called layerscape-sfp.
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+
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endif
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--- a/drivers/nvmem/Makefile
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+++ b/drivers/nvmem/Makefile
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@@ -61,3 +61,5 @@ obj-$(CONFIG_NVMEM_RMEM) += nvmem-rmem.
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nvmem-rmem-y := rmem.o
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obj-$(CONFIG_NVMEM_BRCM_NVRAM) += nvmem_brcm_nvram.o
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nvmem_brcm_nvram-y := brcm_nvram.o
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+obj-$(CONFIG_NVMEM_LAYERSCAPE_SFP) += nvmem-layerscape-sfp.o
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+nvmem-layerscape-sfp-y := layerscape-sfp.o
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--- /dev/null
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+++ b/drivers/nvmem/layerscape-sfp.c
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@@ -0,0 +1,89 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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+/*
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+ * Layerscape SFP driver
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+ *
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+ * Copyright (c) 2022 Michael Walle <michael@walle.cc>
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+ *
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+ */
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+
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+#include <linux/device.h>
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+#include <linux/io.h>
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+#include <linux/mod_devicetable.h>
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+#include <linux/module.h>
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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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+
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+#define LAYERSCAPE_SFP_OTP_OFFSET 0x0200
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+
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+struct layerscape_sfp_priv {
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+ void __iomem *base;
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+};
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+
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+struct layerscape_sfp_data {
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+ int size;
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+};
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+
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+static int layerscape_sfp_read(void *context, unsigned int offset, void *val,
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+ size_t bytes)
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+{
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+ struct layerscape_sfp_priv *priv = context;
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+
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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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+}
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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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+};
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+
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+static int layerscape_sfp_probe(struct platform_device *pdev)
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+{
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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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+
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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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+
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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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+
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+ data = device_get_match_data(&pdev->dev);
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+
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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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+ layerscape_sfp_nvmem_config.priv = priv;
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+
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+ nvmem = devm_nvmem_register(&pdev->dev, &layerscape_sfp_nvmem_config);
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+
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+ return PTR_ERR_OR_ZERO(nvmem);
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+}
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+
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+static const struct layerscape_sfp_data ls1028a_data = {
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+ .size = 0x88,
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+};
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+
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+static const struct of_device_id layerscape_sfp_dt_ids[] = {
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+ { .compatible = "fsl,ls1028a-sfp", .data = &ls1028a_data },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, layerscape_sfp_dt_ids);
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+
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+static struct platform_driver layerscape_sfp_driver = {
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+ .probe = layerscape_sfp_probe,
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+ .driver = {
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+ .name = "layerscape_sfp",
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+ .of_match_table = layerscape_sfp_dt_ids,
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+ },
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+};
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+module_platform_driver(layerscape_sfp_driver);
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+
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+MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
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+MODULE_DESCRIPTION("Layerscape Security Fuse Processor driver");
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+MODULE_LICENSE("GPL");
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