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authorRichard Alpe <richard@bit42.se>2023-08-23 16:27:34 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2023-08-23 17:34:01 +0300
commit0861110bb421daa9b709a20d4fae6921390a9454 (patch)
tree88e92239aec087433e46b85d7ed5ca2729c94a51 /drivers/nvmem
parentaa1ed6047107355d8fe297022e6ca1fa04872ecf (diff)
downloadlinux-0861110bb421daa9b709a20d4fae6921390a9454.tar.xz
nvmem: add new NXP QorIQ eFuse driver
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>
Diffstat (limited to 'drivers/nvmem')
-rw-r--r--drivers/nvmem/Kconfig12
-rw-r--r--drivers/nvmem/Makefile2
-rw-r--r--drivers/nvmem/qoriq-efuse.c78
3 files changed, 92 insertions, 0 deletions
diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index da9befa3d6c4..5c5d7414f78c 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -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
diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
index cc23ce4ffb1f..e0e67a942c4f 100644
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -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
diff --git a/drivers/nvmem/qoriq-efuse.c b/drivers/nvmem/qoriq-efuse.c
new file mode 100644
index 000000000000..e7fd04d6dd94
--- /dev/null
+++ b/drivers/nvmem/qoriq-efuse.c
@@ -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");