kernel: update nvmem subsystem to the latest upstream

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

1 files changed, 139 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.15/804-v5.18-0007-nvmem-add-driver-for-Layerscape-SFP-Security-Fuse-Pr.patch b/target/linux/generic/backport-5.15/804-v5.18-0007-nvmem-add-driver-for-Layerscape-SFP-Security-Fuse-Pr.patch
new file mode 100644
index 0000000000..6afb68b3f9
--- /dev/null
+++ b/target/linux/generic/backport-5.15/804-v5.18-0007-nvmem-add-driver-for-Layerscape-SFP-Security-Fuse-Pr.patch
@@ -0,0 +1,139 @@
+From f78451012b9e159afdba31c3eb69f223a9f42adc Mon Sep 17 00:00:00 2001
+From: Michael Walle <michael@walle.cc>
+Date: Sun, 20 Feb 2022 15:15:23 +0000
+Subject: [PATCH] nvmem: add driver for Layerscape SFP (Security Fuse
+ Processor)
+
+Add support for the Security Fuse Processor found on Layerscape SoCs.
+This driver implements basic read access.
+
+Signed-off-by: Michael Walle <michael@walle.cc>
+Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
+Link: https://lore.kernel.org/r/20220220151527.17216-10-srinivas.kandagatla@linaro.org
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/nvmem/Kconfig          | 12 +++++
+ drivers/nvmem/Makefile         |  2 +
+ drivers/nvmem/layerscape-sfp.c | 89 ++++++++++++++++++++++++++++++++++
+ 3 files changed, 103 insertions(+)
+ create mode 100644 drivers/nvmem/layerscape-sfp.c
+
+--- a/drivers/nvmem/Kconfig
++++ b/drivers/nvmem/Kconfig
+@@ -300,4 +300,16 @@ config NVMEM_BRCM_NVRAM
+ 	  This driver provides support for Broadcom's NVRAM that can be accessed
+ 	  using I/O mapping.
+ 
++config NVMEM_LAYERSCAPE_SFP
++	tristate "Layerscape SFP (Security Fuse Processor) support"
++	depends on ARCH_LAYERSCAPE || COMPILE_TEST
++	depends on HAS_IOMEM
++	help
++	  This driver provides support to read the eFuses on Freescale
++	  Layerscape SoC's. For example, the vendor provides a per part
++	  unique ID there.
++
++	  This driver can also be built as a module. If so, the module
++	  will be called layerscape-sfp.
++
+ endif
+--- a/drivers/nvmem/Makefile
++++ b/drivers/nvmem/Makefile
+@@ -61,3 +61,5 @@ obj-$(CONFIG_NVMEM_RMEM) 	+= nvmem-rmem.
+ nvmem-rmem-y			:= rmem.o
+ obj-$(CONFIG_NVMEM_BRCM_NVRAM)	+= nvmem_brcm_nvram.o
+ nvmem_brcm_nvram-y		:= brcm_nvram.o
++obj-$(CONFIG_NVMEM_LAYERSCAPE_SFP)	+= nvmem-layerscape-sfp.o
++nvmem-layerscape-sfp-y		:= layerscape-sfp.o
+--- /dev/null
++++ b/drivers/nvmem/layerscape-sfp.c
+@@ -0,0 +1,89 @@
++// SPDX-License-Identifier: GPL-2.0-only
++/*
++ * Layerscape SFP driver
++ *
++ * Copyright (c) 2022 Michael Walle <michael@walle.cc>
++ *
++ */
++
++#include <linux/device.h>
++#include <linux/io.h>
++#include <linux/mod_devicetable.h>
++#include <linux/module.h>
++#include <linux/nvmem-provider.h>
++#include <linux/platform_device.h>
++#include <linux/property.h>
++
++#define LAYERSCAPE_SFP_OTP_OFFSET	0x0200
++
++struct layerscape_sfp_priv {
++	void __iomem *base;
++};
++
++struct layerscape_sfp_data {
++	int size;
++};
++
++static int layerscape_sfp_read(void *context, unsigned int offset, void *val,
++			       size_t bytes)
++{
++	struct layerscape_sfp_priv *priv = context;
++
++	memcpy_fromio(val, priv->base + LAYERSCAPE_SFP_OTP_OFFSET + offset,
++		      bytes);
++
++	return 0;
++}
++
++static struct nvmem_config layerscape_sfp_nvmem_config = {
++	.name = "fsl-sfp",
++	.reg_read = layerscape_sfp_read,
++};
++
++static int layerscape_sfp_probe(struct platform_device *pdev)
++{
++	const struct layerscape_sfp_data *data;
++	struct layerscape_sfp_priv *priv;
++	struct nvmem_device *nvmem;
++
++	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);
++
++	data = device_get_match_data(&pdev->dev);
++
++	layerscape_sfp_nvmem_config.size = data->size;
++	layerscape_sfp_nvmem_config.dev = &pdev->dev;
++	layerscape_sfp_nvmem_config.priv = priv;
++
++	nvmem = devm_nvmem_register(&pdev->dev, &layerscape_sfp_nvmem_config);
++
++	return PTR_ERR_OR_ZERO(nvmem);
++}
++
++static const struct layerscape_sfp_data ls1028a_data = {
++	.size = 0x88,
++};
++
++static const struct of_device_id layerscape_sfp_dt_ids[] = {
++	{ .compatible = "fsl,ls1028a-sfp", .data = &ls1028a_data },
++	{},
++};
++MODULE_DEVICE_TABLE(of, layerscape_sfp_dt_ids);
++
++static struct platform_driver layerscape_sfp_driver = {
++	.probe	= layerscape_sfp_probe,
++	.driver = {
++		.name	= "layerscape_sfp",
++		.of_match_table = layerscape_sfp_dt_ids,
++	},
++};
++module_platform_driver(layerscape_sfp_driver);
++
++MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
++MODULE_DESCRIPTION("Layerscape Security Fuse Processor driver");
++MODULE_LICENSE("GPL");