* [PATCH v2 1/3] dt-bindings: nvmem: add fsl,layerscape-sfp binding
2022-02-14 11:55 [PATCH v2 0/3] nvmem: add Layerscape SFP support Michael Walle
@ 2022-02-14 11:55 ` Michael Walle
2022-02-14 11:55 ` [PATCH v2 2/3] nvmem: add driver for Layerscape SFP (Security Fuse Processor) Michael Walle
` (2 subsequent siblings)
3 siblings, 0 replies; 6+ messages in thread
From: Michael Walle @ 2022-02-14 11:55 UTC (permalink / raw)
To: Srinivas Kandagatla, Rob Herring, Krzysztof Kozlowski, Shawn Guo,
Li Yang
Cc: devicetree, linux-kernel, linux-arm-kernel, Michael Walle,
Rob Herring
The Security Fuse Processor provides efuses and is responsible for
reading it at SoC startup and configuring it accordingly.
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Rob Herring <robh@kernel.org>
---
.../bindings/nvmem/fsl,layerscape-sfp.yaml | 38 +++++++++++++++++++
1 file changed, 38 insertions(+)
create mode 100644 Documentation/devicetree/bindings/nvmem/fsl,layerscape-sfp.yaml
diff --git a/Documentation/devicetree/bindings/nvmem/fsl,layerscape-sfp.yaml b/Documentation/devicetree/bindings/nvmem/fsl,layerscape-sfp.yaml
new file mode 100644
index 000000000000..80914b93638e
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/fsl,layerscape-sfp.yaml
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/fsl,layerscape-sfp.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale Layerscape Security Fuse Processor
+
+maintainers:
+ - Michael Walle <michael@walle.cc>
+
+description: |
+ SFP is the security fuse processor which among other things provide a
+ unique identifier per part.
+
+allOf:
+ - $ref: "nvmem.yaml#"
+
+properties:
+ compatible:
+ enum:
+ - fsl,ls1028a-sfp
+
+ reg:
+ maxItems: 1
+
+required:
+ - compatible
+ - reg
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ efuse@1e80000 {
+ compatible = "fsl,ls1028a-sfp";
+ reg = <0x1e80000 0x8000>;
+ };
--
2.30.2
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^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v2 2/3] nvmem: add driver for Layerscape SFP (Security Fuse Processor)
2022-02-14 11:55 [PATCH v2 0/3] nvmem: add Layerscape SFP support Michael Walle
2022-02-14 11:55 ` [PATCH v2 1/3] dt-bindings: nvmem: add fsl,layerscape-sfp binding Michael Walle
@ 2022-02-14 11:55 ` Michael Walle
2022-02-14 11:55 ` [PATCH v2 3/3] arm64: dts: ls1028a: add efuse node Michael Walle
2022-02-14 11:58 ` [PATCH v2 0/3] nvmem: add Layerscape SFP support Srinivas Kandagatla
3 siblings, 0 replies; 6+ messages in thread
From: Michael Walle @ 2022-02-14 11:55 UTC (permalink / raw)
To: Srinivas Kandagatla, Rob Herring, Krzysztof Kozlowski, Shawn Guo,
Li Yang
Cc: devicetree, linux-kernel, linux-arm-kernel, Michael Walle
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>
---
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
diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index 94dd60b2654e..63792082e476 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -307,4 +307,16 @@ 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
diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
index 4e6d877fdfaf..914358fcdb37 100644
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -62,3 +62,5 @@ obj-$(CONFIG_NVMEM_RMEM) += nvmem-rmem.o
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
diff --git a/drivers/nvmem/layerscape-sfp.c b/drivers/nvmem/layerscape-sfp.c
new file mode 100644
index 000000000000..e591c1511e33
--- /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");
--
2.30.2
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^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v2 3/3] arm64: dts: ls1028a: add efuse node
2022-02-14 11:55 [PATCH v2 0/3] nvmem: add Layerscape SFP support Michael Walle
2022-02-14 11:55 ` [PATCH v2 1/3] dt-bindings: nvmem: add fsl,layerscape-sfp binding Michael Walle
2022-02-14 11:55 ` [PATCH v2 2/3] nvmem: add driver for Layerscape SFP (Security Fuse Processor) Michael Walle
@ 2022-02-14 11:55 ` Michael Walle
2022-02-21 3:51 ` Shawn Guo
2022-02-14 11:58 ` [PATCH v2 0/3] nvmem: add Layerscape SFP support Srinivas Kandagatla
3 siblings, 1 reply; 6+ messages in thread
From: Michael Walle @ 2022-02-14 11:55 UTC (permalink / raw)
To: Srinivas Kandagatla, Rob Herring, Krzysztof Kozlowski, Shawn Guo,
Li Yang
Cc: devicetree, linux-kernel, linux-arm-kernel, Michael Walle
Layerscape SoCs contain a Security Fuse Processor which is basically a
efuse controller. Add the node, so userspace can read the efuses.
Signed-off-by: Michael Walle <michael@walle.cc>
---
arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi b/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi
index 7d44102d9c6c..4b248cee830a 100644
--- a/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi
+++ b/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi
@@ -224,6 +224,17 @@ rst: syscon@1e60000 {
little-endian;
};
+ efuse@1e80000 {
+ compatible = "fsl,ls1028a-sfp";
+ reg = <0x0 0x1e80000 0x0 0x10000>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ ls1028a_uid: unique-id@1c {
+ reg = <0x1c 0x8>;
+ };
+ };
+
scfg: syscon@1fc0000 {
compatible = "fsl,ls1028a-scfg", "syscon";
reg = <0x0 0x1fc0000 0x0 0x10000>;
--
2.30.2
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^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH v2 3/3] arm64: dts: ls1028a: add efuse node
2022-02-14 11:55 ` [PATCH v2 3/3] arm64: dts: ls1028a: add efuse node Michael Walle
@ 2022-02-21 3:51 ` Shawn Guo
0 siblings, 0 replies; 6+ messages in thread
From: Shawn Guo @ 2022-02-21 3:51 UTC (permalink / raw)
To: Michael Walle
Cc: Srinivas Kandagatla, Rob Herring, Krzysztof Kozlowski, Li Yang,
devicetree, linux-kernel, linux-arm-kernel
On Mon, Feb 14, 2022 at 12:55:29PM +0100, Michael Walle wrote:
> Layerscape SoCs contain a Security Fuse Processor which is basically a
> efuse controller. Add the node, so userspace can read the efuses.
>
> Signed-off-by: Michael Walle <michael@walle.cc>
Applied, thanks!
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2 0/3] nvmem: add Layerscape SFP support
2022-02-14 11:55 [PATCH v2 0/3] nvmem: add Layerscape SFP support Michael Walle
` (2 preceding siblings ...)
2022-02-14 11:55 ` [PATCH v2 3/3] arm64: dts: ls1028a: add efuse node Michael Walle
@ 2022-02-14 11:58 ` Srinivas Kandagatla
3 siblings, 0 replies; 6+ messages in thread
From: Srinivas Kandagatla @ 2022-02-14 11:58 UTC (permalink / raw)
To: Michael Walle, Rob Herring, Krzysztof Kozlowski, Shawn Guo,
Li Yang
Cc: devicetree, linux-kernel, linux-arm-kernel
On 14/02/2022 11:55, Michael Walle wrote:
> Add support for the Security Fuse Processor found on Layerscape
> SoCs.
>
> changes since v1:
> - added Rob's Rb
> - cleaned up the include files
> - changed the module license to only "GPL"
> - fix indendation, split lines longer than 80c
>
> Michael Walle (3):
> dt-bindings: nvmem: add fsl,layerscape-sfp binding
> nvmem: add driver for Layerscape SFP (Security Fuse Processor)
Applied 1/3 and 2/3.
dts patch has to go via respective arm soc maintainer tree.
--srini
> arm64: dts: ls1028a: add efuse node
>
> .../bindings/nvmem/fsl,layerscape-sfp.yaml | 38 ++++++++
> .../arm64/boot/dts/freescale/fsl-ls1028a.dtsi | 11 +++
> drivers/nvmem/Kconfig | 12 +++
> drivers/nvmem/Makefile | 2 +
> drivers/nvmem/layerscape-sfp.c | 89 +++++++++++++++++++
> 5 files changed, 152 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/nvmem/fsl,layerscape-sfp.yaml
> create mode 100644 drivers/nvmem/layerscape-sfp.c
>
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^ permalink raw reply [flat|nested] 6+ messages in thread