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nvmem: add new NXP QorIQ eFuse driver

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Add SFP (Security Fuse Processor) read support for NXP (Freescale)
QorIQ series SOC's.

This patch adds support for the T1023 SOC using the SFP offset from
the existing T1023 device tree. In theory this should also work for
T1024, T1014 and T1013 which uses the same SFP base offset.

Signed-off-by: Richard Alpe <richard@bit42.se>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20230823132744.350618-13-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Richard Alpe 2023-08-23 14:27:34 +01:00 committed by Greg Kroah-Hartman
parent aa1ed60471
commit 0861110bb4
3 changed files with 92 additions and 0 deletions
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12
drivers/nvmem/Kconfig
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@ -392,4 +392,16 @@ config NVMEM_ZYNQMP
If sure, say yes. If unsure, say no.
config NVMEM_QORIQ_EFUSE
tristate "NXP QorIQ eFuse support"
depends on PPC_85xx || COMPILE_TEST
depends on HAS_IOMEM
help
This driver provides read support for the eFuses (SFP) on NXP QorIQ
series SoC's. This includes secure boot settings, the globally unique
NXP ID 'FUIDR' and the OEM unique ID 'OUIDR'.
This driver can also be built as a module. If so, the module
will be called nvmem_qoriq_efuse.
endif

2
drivers/nvmem/Makefile
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@ -77,3 +77,5 @@ obj-$(CONFIG_NVMEM_VF610_OCOTP) += nvmem-vf610-ocotp.o
nvmem-vf610-ocotp-y := vf610-ocotp.o
obj-$(CONFIG_NVMEM_ZYNQMP) += nvmem_zynqmp_nvmem.o
nvmem_zynqmp_nvmem-y := zynqmp_nvmem.o
obj-$(CONFIG_NVMEM_QORIQ_EFUSE) += nvmem-qoriq-efuse.o
nvmem-qoriq-efuse-y := qoriq-efuse.o

78
drivers/nvmem/qoriq-efuse.c Normal file
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@ -0,0 +1,78 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2023 Westermo Network Technologies AB
*/
#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/nvmem-provider.h>
#include <linux/platform_device.h>
struct qoriq_efuse_priv {
void __iomem *base;
};
static int qoriq_efuse_read(void *context, unsigned int offset, void *val,
size_t bytes)
{
struct qoriq_efuse_priv *priv = context;
/* .stride = 4 so offset is guaranteed to be aligned */
__ioread32_copy(val, priv->base + offset, bytes / 4);
/* Ignore trailing bytes (there shouldn't be any) */
return 0;
}
static int qoriq_efuse_probe(struct platform_device *pdev)
{
struct nvmem_config config = {
.dev = &pdev->dev,
.read_only = true,
.reg_read = qoriq_efuse_read,
.stride = sizeof(u32),
.word_size = sizeof(u32),
.name = "qoriq_efuse_read",
.id = NVMEM_DEVID_AUTO,
.root_only = true,
};
struct qoriq_efuse_priv *priv;
struct nvmem_device *nvmem;
struct resource *res;
priv = devm_kzalloc(config.dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(priv->base))
return PTR_ERR(priv->base);
config.size = resource_size(res);
config.priv = priv;
nvmem = devm_nvmem_register(config.dev, &config);
return PTR_ERR_OR_ZERO(nvmem);
}
static const struct of_device_id qoriq_efuse_of_match[] = {
{ .compatible = "fsl,t1023-sfp", },
{/* sentinel */},
};
MODULE_DEVICE_TABLE(of, qoriq_efuse_of_match);
static struct platform_driver qoriq_efuse_driver = {
.probe = qoriq_efuse_probe,
.driver = {
.name = "qoriq-efuse",
.of_match_table = qoriq_efuse_of_match,
},
};
module_platform_driver(qoriq_efuse_driver);
MODULE_AUTHOR("Richard Alpe <richard.alpe@bit42.se>");
MODULE_DESCRIPTION("NXP QorIQ Security Fuse Processor (SFP) Reader");
MODULE_LICENSE("GPL");