[PATCH 2/3] dt-bindings: nvmem: Add bindings for ZynqMP nvmem driver

[PATCH 2/3] dt-bindings: nvmem: Add bindings for ZynqMP nvmem driver

[Nava kishore Manne]

Add documentation to describe Xilinx ZynqMP nvmem driver
bindings.

Signed-off-by: Nava kishore Manne <nava.manne@xilinx.com>
---
Changes for v1:
		Created a Seperate(New) DT binding file as
		suggested by Rob.

Changes for RFC-V3:
                -None.

Changes for RFC-V2:
                -Moved nvmem_firmware node as a child to
                 firwmare node.

 .../bindings/nvmem/xlnx,zynqmp-nvmem.txt           | 37 ++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt

diff --git a/Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt b/Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt
new file mode 100644
index 0000000..0bafb9f
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt
@@ -0,0 +1,37 @@
+--------------------------------------------------------------------------
+=  Zynq UltraScale+ MPSoC nvmem firmware driver binding =
+--------------------------------------------------------------------------
+The nvmem_firmware node provides access to the hardware related data
+like soc revision, IDCODE... etc, By using the firmware interface.
+
+Required properties:
+- compatible: should be "xlnx,zynqmp-nvmem-fw"
+
+= Data cells =
+Are child nodes of silicon id, bindings of which as described in
+bindings/nvmem/nvmem.txt
+
+-------
+ Example
+-------
+	nvmem_firmware {
+		compatible = "xlnx,zynqmp-nvmem-fw";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		/* Data cells */
+		soc_revision: soc_revision {
+			reg = <0x0 0x4>;
+		};
+	};
+
+= Data consumers =
+Are device nodes which consume nvmem data cells.
+
+For example:
+	pcap {
+		...
+		nvmem-cells = <&soc_revision>;
+		nvmem-cell-names = "soc_revision";
+	};
+
-- 
2.7.4

[PATCH 0/3] Add nvmem driver support for ZynqMP

[Nava kishore Manne]

This series of patches are created On top of the
below repo 
//git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc.git
BRANCH: next/drivers

Nava kishore Manne (3):
  firmware: xilinx: Add zynqmp_pm_get_chipid() API
  dt-bindings: nvmem: Add bindings for ZynqMP nvmem driver
  nvmem: zynqmp: Added zynqmp nvmem firmware driver

 .../bindings/nvmem/xlnx,zynqmp-nvmem.txt           | 37 ++++++++++
 drivers/firmware/xilinx/zynqmp.c                   | 24 ++++++
 drivers/nvmem/Kconfig                              | 15 ++--
 drivers/nvmem/Makefile                             |  5 +-
 drivers/nvmem/zynqmp_nvmem.c                       | 86 ++++++++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h               |  2 +
 6 files changed, 159 insertions(+), 10 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt
 create mode 100644 drivers/nvmem/zynqmp_nvmem.c

-- 
2.7.4

[PATCH 3/3] nvmem: zynqmp: Added zynqmp nvmem firmware driver

[Nava kishore Manne]

This patch adds zynqmp nvmem firmware driver to access the
SoC revision information from the hardware register.

Signed-off-by: Nava kishore Manne <nava.manne@xilinx.com>
---
Changes for v1:
		-None

Changes for RFC-V3:
                -Changed nvmem_register() to devm_nvmem_register()
                 and pr_debug() to dev_dbg() as suggested by srinivas.

Changes for RFC-V2:
                -None.

 drivers/nvmem/Kconfig        | 15 ++++----
 drivers/nvmem/Makefile       |  5 +--
 drivers/nvmem/zynqmp_nvmem.c | 86 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 96 insertions(+), 10 deletions(-)
 create mode 100644 drivers/nvmem/zynqmp_nvmem.c

diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index 0a7a470e..2edb142 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -181,15 +181,14 @@ config RAVE_SP_EEPROM
 	help
 	  Say y here to enable Rave SP EEPROM support.
 
-config SC27XX_EFUSE
-	tristate "Spreadtrum SC27XX eFuse Support"
-	depends on MFD_SC27XX_PMIC || COMPILE_TEST
-	depends on HAS_IOMEM
+config NVMEM_ZYNQMP
+	bool "Xilinx ZYNQMP SoC nvmem firmware support"
+	depends on ARCH_ZYNQMP
 	help
-	  This is a simple driver to dump specified values of Spreadtrum
-	  SC27XX PMICs from eFuse.
+	  This is a driver to access hardware related data like
+	  soc revision, IDCODE... etc by using the firmware
+	  interface.
 
-	  This driver can also be built as a module. If so, the module
-	  will be called nvmem-sc27xx-efuse.
+	  If sure, say yes. If unsure, say no.
 
 endif
diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
index 4e8c616..0b3abd7 100644
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -39,5 +39,6 @@ obj-$(CONFIG_NVMEM_SNVS_LPGPR)	+= nvmem_snvs_lpgpr.o
 nvmem_snvs_lpgpr-y		:= snvs_lpgpr.o
 obj-$(CONFIG_RAVE_SP_EEPROM)	+= nvmem-rave-sp-eeprom.o
 nvmem-rave-sp-eeprom-y		:= rave-sp-eeprom.o
-obj-$(CONFIG_SC27XX_EFUSE)	+= nvmem-sc27xx-efuse.o
-nvmem-sc27xx-efuse-y		:= sc27xx-efuse.o
+obj-$(CONFIG_NVMEM_ZYNQMP)     += nvmem_zynqmp_nvmem.o
+nvmem_zynqmp_nvmem-y           := zynqmp_nvmem.o
+
diff --git a/drivers/nvmem/zynqmp_nvmem.c b/drivers/nvmem/zynqmp_nvmem.c
new file mode 100644
index 0000000..b910864
--- /dev/null
+++ b/drivers/nvmem/zynqmp_nvmem.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Xilinx, Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/nvmem-provider.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/firmware/xlnx-zynqmp.h>
+
+#define SILICON_REVISION_MASK 0xF
+
+struct zynqmp_nvmem_data {
+	struct device *dev;
+	struct nvmem_device *nvmem;
+};
+
+static int zynqmp_nvmem_read(void *context, unsigned int offset,
+			     void *val, size_t bytes)
+{
+	int ret;
+	int idcode, version;
+	struct zynqmp_nvmem_data *priv = context;
+
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	if (!eemi_ops || !eemi_ops->get_chipid)
+		return -ENXIO;
+
+	ret = eemi_ops->get_chipid(&idcode, &version);
+	if (ret < 0)
+		return ret;
+
+	dev_dbg(priv->dev, "Read chipid val %x %x\n", idcode, version);
+	*(int *)val = version & SILICON_REVISION_MASK;
+
+	return 0;
+}
+
+static struct nvmem_config econfig = {
+	.name = "zynqmp-nvmem",
+	.owner = THIS_MODULE,
+	.word_size = 1,
+	.size = 1,
+	.read_only = true,
+};
+
+static const struct of_device_id zynqmp_nvmem_match[] = {
+	{ .compatible = "xlnx,zynqmp-nvmem-fw", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, zynqmp_nvmem_match);
+
+static int zynqmp_nvmem_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct zynqmp_nvmem_data *priv;
+
+	priv = devm_kzalloc(dev, sizeof(struct zynqmp_nvmem_data), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->dev = dev;
+	econfig.dev = dev;
+	econfig.reg_read = zynqmp_nvmem_read;
+	econfig.priv = priv;
+
+	priv->nvmem = devm_nvmem_register(dev, &econfig);
+
+	return PTR_ERR_OR_ZERO(priv->nvmem);
+}
+
+static struct platform_driver zynqmp_nvmem_driver = {
+	.probe = zynqmp_nvmem_probe,
+	.driver = {
+		.name = "zynqmp-nvmem",
+		.of_match_table = zynqmp_nvmem_match,
+	},
+};
+
+module_platform_driver(zynqmp_nvmem_driver);
+
+MODULE_AUTHOR("Michal Simek <michal.simek@xilinx.com>, Nava kishore Manne <navam@xilinx.com>");
+MODULE_DESCRIPTION("ZynqMP NVMEM driver");
+MODULE_LICENSE("GPL");
-- 
2.7.4

[PATCH 0/3] Add nvmem driver support for ZynqMP

[Nava kishore Manne]

This series of patches are created On top of the
below repo 
//git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc.git
BRANCH: next/drivers

Nava kishore Manne (3):
  firmware: xilinx: Add zynqmp_pm_get_chipid() API
  dt-bindings: nvmem: Add bindings for ZynqMP nvmem driver
  nvmem: zynqmp: Added zynqmp nvmem firmware driver

 .../bindings/nvmem/xlnx,zynqmp-nvmem.txt           | 37 ++++++++++
 drivers/firmware/xilinx/zynqmp.c                   | 24 ++++++
 drivers/nvmem/Kconfig                              | 15 ++--
 drivers/nvmem/Makefile                             |  5 +-
 drivers/nvmem/zynqmp_nvmem.c                       | 86 ++++++++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h               |  2 +
 6 files changed, 159 insertions(+), 10 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt
 create mode 100644 drivers/nvmem/zynqmp_nvmem.c

-- 
2.7.4

[PATCH 0/3] Add nvmem driver support for ZynqMP

[Nava kishore Manne]

This series of patches are created On top of the
below repo 
//git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc.git
BRANCH: next/drivers

Nava kishore Manne (3):
  firmware: xilinx: Add zynqmp_pm_get_chipid() API
  dt-bindings: nvmem: Add bindings for ZynqMP nvmem driver
  nvmem: zynqmp: Added zynqmp nvmem firmware driver

 .../bindings/nvmem/xlnx,zynqmp-nvmem.txt           | 37 ++++++++++
 drivers/firmware/xilinx/zynqmp.c                   | 24 ++++++
 drivers/nvmem/Kconfig                              | 15 ++--
 drivers/nvmem/Makefile                             |  5 +-
 drivers/nvmem/zynqmp_nvmem.c                       | 86 ++++++++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h               |  2 +
 6 files changed, 159 insertions(+), 10 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt
 create mode 100644 drivers/nvmem/zynqmp_nvmem.c

-- 
2.7.4

[PATCH 1/3] firmware: xilinx: Add zynqmp_pm_get_chipid() API

[Nava kishore Manne]

This patch adds a new API to provide access to the
hardware related data like soc revision, IDCODE... etc.

Signed-off-by: Nava kishore Manne <nava.manne@xilinx.com>
---
Changes for v1:
		-None.

Changes for RFC-V3:
                -corrected typo error in commit msg.

Changes for RFC-v2:
                -New Patch.

 drivers/firmware/xilinx/zynqmp.c     | 24 ++++++++++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h |  2 ++
 2 files changed, 26 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 84b3fd2..e76c889 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -187,6 +187,29 @@ static int zynqmp_pm_get_api_version(u32 *version)
 }
 
 /**
+ * zynqmp_pm_get_chipid - Get silicon ID registers
+ * @idcode:     IDCODE register
+ * @version:    version register
+ *
+ * Return:      Returns the status of the operation and the idcode and version
+ *              registers in @idcode and @version.
+ */
+static int zynqmp_pm_get_chipid(u32 *idcode, u32 *version)
+{
+	u32 ret_payload[PAYLOAD_ARG_CNT];
+	int ret;
+
+	if (!idcode || !version)
+		return -EINVAL;
+
+	ret = zynqmp_pm_invoke_fn(PM_GET_CHIPID, 0, 0, 0, 0, ret_payload);
+	*idcode = ret_payload[1];
+	*version = ret_payload[2];
+
+	return ret;
+}
+
+/**
  * zynqmp_pm_get_trustzone_version() - Get secure trustzone firmware version
  * @version:	Returned version value
  *
@@ -430,6 +453,7 @@ static int zynqmp_pm_clock_getparent(u32 clock_id, u32 *parent_id)
 
 static const struct zynqmp_eemi_ops eemi_ops = {
 	.get_api_version = zynqmp_pm_get_api_version,
+	.get_chipid = zynqmp_pm_get_chipid,
 	.query_data = zynqmp_pm_query_data,
 	.clock_enable = zynqmp_pm_clock_enable,
 	.clock_disable = zynqmp_pm_clock_disable,
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 015e130..1d3126d 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -34,6 +34,7 @@
 
 enum pm_api_id {
 	PM_GET_API_VERSION = 1,
+	PM_GET_CHIPID = 22,
 	PM_QUERY_DATA = 35,
 	PM_CLOCK_ENABLE,
 	PM_CLOCK_DISABLE,
@@ -89,6 +90,7 @@ struct zynqmp_pm_query_data {
 
 struct zynqmp_eemi_ops {
 	int (*get_api_version)(u32 *version);
+	int (*get_chipid)(u32 *idcode, u32 *version);
 	int (*query_data)(struct zynqmp_pm_query_data qdata, u32 *out);
 	int (*clock_enable)(u32 clock_id);
 	int (*clock_disable)(u32 clock_id);
-- 
2.7.4

[PATCH 1/3] firmware: xilinx: Add zynqmp_pm_get_chipid() API

[Nava kishore Manne]

This patch adds a new API to provide access to the
hardware related data like soc revision, IDCODE... etc.

Signed-off-by: Nava kishore Manne <nava.manne@xilinx.com>
---
Changes for v1:
		-None.

Changes for RFC-V3:
                -corrected typo error in commit msg.

Changes for RFC-v2:
                -New Patch.

 drivers/firmware/xilinx/zynqmp.c     | 24 ++++++++++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h |  2 ++
 2 files changed, 26 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 84b3fd2..e76c889 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -187,6 +187,29 @@ static int zynqmp_pm_get_api_version(u32 *version)
 }
 
 /**
+ * zynqmp_pm_get_chipid - Get silicon ID registers
+ * @idcode:     IDCODE register
+ * @version:    version register
+ *
+ * Return:      Returns the status of the operation and the idcode and version
+ *              registers in @idcode and @version.
+ */
+static int zynqmp_pm_get_chipid(u32 *idcode, u32 *version)
+{
+	u32 ret_payload[PAYLOAD_ARG_CNT];
+	int ret;
+
+	if (!idcode || !version)
+		return -EINVAL;
+
+	ret = zynqmp_pm_invoke_fn(PM_GET_CHIPID, 0, 0, 0, 0, ret_payload);
+	*idcode = ret_payload[1];
+	*version = ret_payload[2];
+
+	return ret;
+}
+
+/**
  * zynqmp_pm_get_trustzone_version() - Get secure trustzone firmware version
  * @version:	Returned version value
  *
@@ -430,6 +453,7 @@ static int zynqmp_pm_clock_getparent(u32 clock_id, u32 *parent_id)
 
 static const struct zynqmp_eemi_ops eemi_ops = {
 	.get_api_version = zynqmp_pm_get_api_version,
+	.get_chipid = zynqmp_pm_get_chipid,
 	.query_data = zynqmp_pm_query_data,
 	.clock_enable = zynqmp_pm_clock_enable,
 	.clock_disable = zynqmp_pm_clock_disable,
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 015e130..1d3126d 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -34,6 +34,7 @@
 
 enum pm_api_id {
 	PM_GET_API_VERSION = 1,
+	PM_GET_CHIPID = 22,
 	PM_QUERY_DATA = 35,
 	PM_CLOCK_ENABLE,
 	PM_CLOCK_DISABLE,
@@ -89,6 +90,7 @@ struct zynqmp_pm_query_data {
 
 struct zynqmp_eemi_ops {
 	int (*get_api_version)(u32 *version);
+	int (*get_chipid)(u32 *idcode, u32 *version);
 	int (*query_data)(struct zynqmp_pm_query_data qdata, u32 *out);
 	int (*clock_enable)(u32 clock_id);
 	int (*clock_disable)(u32 clock_id);
-- 
2.7.4

[PATCH 1/3] firmware: xilinx: Add zynqmp_pm_get_chipid() API

[Nava kishore Manne]

This patch adds a new API to provide access to the
hardware related data like soc revision, IDCODE... etc.

Signed-off-by: Nava kishore Manne <nava.manne@xilinx.com>
---
Changes for v1:
		-None.

Changes for RFC-V3:
                -corrected typo error in commit msg.

Changes for RFC-v2:
                -New Patch.

 drivers/firmware/xilinx/zynqmp.c     | 24 ++++++++++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h |  2 ++
 2 files changed, 26 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 84b3fd2..e76c889 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -187,6 +187,29 @@ static int zynqmp_pm_get_api_version(u32 *version)
 }
 
 /**
+ * zynqmp_pm_get_chipid - Get silicon ID registers
+ * @idcode:     IDCODE register
+ * @version:    version register
+ *
+ * Return:      Returns the status of the operation and the idcode and version
+ *              registers in @idcode and @version.
+ */
+static int zynqmp_pm_get_chipid(u32 *idcode, u32 *version)
+{
+	u32 ret_payload[PAYLOAD_ARG_CNT];
+	int ret;
+
+	if (!idcode || !version)
+		return -EINVAL;
+
+	ret = zynqmp_pm_invoke_fn(PM_GET_CHIPID, 0, 0, 0, 0, ret_payload);
+	*idcode = ret_payload[1];
+	*version = ret_payload[2];
+
+	return ret;
+}
+
+/**
  * zynqmp_pm_get_trustzone_version() - Get secure trustzone firmware version
  * @version:	Returned version value
  *
@@ -430,6 +453,7 @@ static int zynqmp_pm_clock_getparent(u32 clock_id, u32 *parent_id)
 
 static const struct zynqmp_eemi_ops eemi_ops = {
 	.get_api_version = zynqmp_pm_get_api_version,
+	.get_chipid = zynqmp_pm_get_chipid,
 	.query_data = zynqmp_pm_query_data,
 	.clock_enable = zynqmp_pm_clock_enable,
 	.clock_disable = zynqmp_pm_clock_disable,
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 015e130..1d3126d 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -34,6 +34,7 @@
 
 enum pm_api_id {
 	PM_GET_API_VERSION = 1,
+	PM_GET_CHIPID = 22,
 	PM_QUERY_DATA = 35,
 	PM_CLOCK_ENABLE,
 	PM_CLOCK_DISABLE,
@@ -89,6 +90,7 @@ struct zynqmp_pm_query_data {
 
 struct zynqmp_eemi_ops {
 	int (*get_api_version)(u32 *version);
+	int (*get_chipid)(u32 *idcode, u32 *version);
 	int (*query_data)(struct zynqmp_pm_query_data qdata, u32 *out);
 	int (*clock_enable)(u32 clock_id);
 	int (*clock_disable)(u32 clock_id);
-- 
2.7.4

[PATCH 2/3] dt-bindings: nvmem: Add bindings for ZynqMP nvmem driver

[Nava kishore Manne]

Add documentation to describe Xilinx ZynqMP nvmem driver
bindings.

Signed-off-by: Nava kishore Manne <nava.manne@xilinx.com>
---
Changes for v1:
		Created a Seperate(New) DT binding file as
		suggested by Rob.

Changes for RFC-V3:
                -None.

Changes for RFC-V2:
                -Moved nvmem_firmware node as a child to
                 firwmare node.

 .../bindings/nvmem/xlnx,zynqmp-nvmem.txt           | 37 ++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt

diff --git a/Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt b/Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt
new file mode 100644
index 0000000..0bafb9f
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt
@@ -0,0 +1,37 @@
+--------------------------------------------------------------------------
+=  Zynq UltraScale+ MPSoC nvmem firmware driver binding =
+--------------------------------------------------------------------------
+The nvmem_firmware node provides access to the hardware related data
+like soc revision, IDCODE... etc, By using the firmware interface.
+
+Required properties:
+- compatible: should be "xlnx,zynqmp-nvmem-fw"
+
+= Data cells =
+Are child nodes of silicon id, bindings of which as described in
+bindings/nvmem/nvmem.txt
+
+-------
+ Example
+-------
+	nvmem_firmware {
+		compatible = "xlnx,zynqmp-nvmem-fw";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		/* Data cells */
+		soc_revision: soc_revision {
+			reg = <0x0 0x4>;
+		};
+	};
+
+= Data consumers =
+Are device nodes which consume nvmem data cells.
+
+For example:
+	pcap {
+		...
+		nvmem-cells = <&soc_revision>;
+		nvmem-cell-names = "soc_revision";
+	};
+
-- 
2.7.4

[PATCH 2/3] dt-bindings: nvmem: Add bindings for ZynqMP nvmem driver

[Nava kishore Manne]

Add documentation to describe Xilinx ZynqMP nvmem driver
bindings.

Signed-off-by: Nava kishore Manne <nava.manne@xilinx.com>
---
Changes for v1:
		Created a Seperate(New) DT binding file as
		suggested by Rob.

Changes for RFC-V3:
                -None.

Changes for RFC-V2:
                -Moved nvmem_firmware node as a child to
                 firwmare node.

 .../bindings/nvmem/xlnx,zynqmp-nvmem.txt           | 37 ++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt

diff --git a/Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt b/Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt
new file mode 100644
index 0000000..0bafb9f
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt
@@ -0,0 +1,37 @@
+--------------------------------------------------------------------------
+=  Zynq UltraScale+ MPSoC nvmem firmware driver binding =
+--------------------------------------------------------------------------
+The nvmem_firmware node provides access to the hardware related data
+like soc revision, IDCODE... etc, By using the firmware interface.
+
+Required properties:
+- compatible: should be "xlnx,zynqmp-nvmem-fw"
+
+= Data cells =
+Are child nodes of silicon id, bindings of which as described in
+bindings/nvmem/nvmem.txt
+
+-------
+ Example
+-------
+	nvmem_firmware {
+		compatible = "xlnx,zynqmp-nvmem-fw";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		/* Data cells */
+		soc_revision: soc_revision {
+			reg = <0x0 0x4>;
+		};
+	};
+
+= Data consumers =
+Are device nodes which consume nvmem data cells.
+
+For example:
+	pcap {
+		...
+		nvmem-cells = <&soc_revision>;
+		nvmem-cell-names = "soc_revision";
+	};
+
-- 
2.7.4

[PATCH 3/3] nvmem: zynqmp: Added zynqmp nvmem firmware driver

[Nava kishore Manne]

This patch adds zynqmp nvmem firmware driver to access the
SoC revision information from the hardware register.

Signed-off-by: Nava kishore Manne <nava.manne@xilinx.com>
---
Changes for v1:
		-None

Changes for RFC-V3:
                -Changed nvmem_register() to devm_nvmem_register()
                 and pr_debug() to dev_dbg() as suggested by srinivas.

Changes for RFC-V2:
                -None.

 drivers/nvmem/Kconfig        | 15 ++++----
 drivers/nvmem/Makefile       |  5 +--
 drivers/nvmem/zynqmp_nvmem.c | 86 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 96 insertions(+), 10 deletions(-)
 create mode 100644 drivers/nvmem/zynqmp_nvmem.c

diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index 0a7a470e..2edb142 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -181,15 +181,14 @@ config RAVE_SP_EEPROM
 	help
 	  Say y here to enable Rave SP EEPROM support.
 
-config SC27XX_EFUSE
-	tristate "Spreadtrum SC27XX eFuse Support"
-	depends on MFD_SC27XX_PMIC || COMPILE_TEST
-	depends on HAS_IOMEM
+config NVMEM_ZYNQMP
+	bool "Xilinx ZYNQMP SoC nvmem firmware support"
+	depends on ARCH_ZYNQMP
 	help
-	  This is a simple driver to dump specified values of Spreadtrum
-	  SC27XX PMICs from eFuse.
+	  This is a driver to access hardware related data like
+	  soc revision, IDCODE... etc by using the firmware
+	  interface.
 
-	  This driver can also be built as a module. If so, the module
-	  will be called nvmem-sc27xx-efuse.
+	  If sure, say yes. If unsure, say no.
 
 endif
diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
index 4e8c616..0b3abd7 100644
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -39,5 +39,6 @@ obj-$(CONFIG_NVMEM_SNVS_LPGPR)	+= nvmem_snvs_lpgpr.o
 nvmem_snvs_lpgpr-y		:= snvs_lpgpr.o
 obj-$(CONFIG_RAVE_SP_EEPROM)	+= nvmem-rave-sp-eeprom.o
 nvmem-rave-sp-eeprom-y		:= rave-sp-eeprom.o
-obj-$(CONFIG_SC27XX_EFUSE)	+= nvmem-sc27xx-efuse.o
-nvmem-sc27xx-efuse-y		:= sc27xx-efuse.o
+obj-$(CONFIG_NVMEM_ZYNQMP)     += nvmem_zynqmp_nvmem.o
+nvmem_zynqmp_nvmem-y           := zynqmp_nvmem.o
+
diff --git a/drivers/nvmem/zynqmp_nvmem.c b/drivers/nvmem/zynqmp_nvmem.c
new file mode 100644
index 0000000..b910864
--- /dev/null
+++ b/drivers/nvmem/zynqmp_nvmem.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Xilinx, Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/nvmem-provider.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/firmware/xlnx-zynqmp.h>
+
+#define SILICON_REVISION_MASK 0xF
+
+struct zynqmp_nvmem_data {
+	struct device *dev;
+	struct nvmem_device *nvmem;
+};
+
+static int zynqmp_nvmem_read(void *context, unsigned int offset,
+			     void *val, size_t bytes)
+{
+	int ret;
+	int idcode, version;
+	struct zynqmp_nvmem_data *priv = context;
+
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	if (!eemi_ops || !eemi_ops->get_chipid)
+		return -ENXIO;
+
+	ret = eemi_ops->get_chipid(&idcode, &version);
+	if (ret < 0)
+		return ret;
+
+	dev_dbg(priv->dev, "Read chipid val %x %x\n", idcode, version);
+	*(int *)val = version & SILICON_REVISION_MASK;
+
+	return 0;
+}
+
+static struct nvmem_config econfig = {
+	.name = "zynqmp-nvmem",
+	.owner = THIS_MODULE,
+	.word_size = 1,
+	.size = 1,
+	.read_only = true,
+};
+
+static const struct of_device_id zynqmp_nvmem_match[] = {
+	{ .compatible = "xlnx,zynqmp-nvmem-fw", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, zynqmp_nvmem_match);
+
+static int zynqmp_nvmem_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct zynqmp_nvmem_data *priv;
+
+	priv = devm_kzalloc(dev, sizeof(struct zynqmp_nvmem_data), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->dev = dev;
+	econfig.dev = dev;
+	econfig.reg_read = zynqmp_nvmem_read;
+	econfig.priv = priv;
+
+	priv->nvmem = devm_nvmem_register(dev, &econfig);
+
+	return PTR_ERR_OR_ZERO(priv->nvmem);
+}
+
+static struct platform_driver zynqmp_nvmem_driver = {
+	.probe = zynqmp_nvmem_probe,
+	.driver = {
+		.name = "zynqmp-nvmem",
+		.of_match_table = zynqmp_nvmem_match,
+	},
+};
+
+module_platform_driver(zynqmp_nvmem_driver);
+
+MODULE_AUTHOR("Michal Simek <michal.simek@xilinx.com>, Nava kishore Manne <navam@xilinx.com>");
+MODULE_DESCRIPTION("ZynqMP NVMEM driver");
+MODULE_LICENSE("GPL");
-- 
2.7.4

[PATCH 3/3] nvmem: zynqmp: Added zynqmp nvmem firmware driver

[Nava kishore Manne]

This patch adds zynqmp nvmem firmware driver to access the
SoC revision information from the hardware register.

Signed-off-by: Nava kishore Manne <nava.manne@xilinx.com>
---
Changes for v1:
		-None

Changes for RFC-V3:
                -Changed nvmem_register() to devm_nvmem_register()
                 and pr_debug() to dev_dbg() as suggested by srinivas.

Changes for RFC-V2:
                -None.

 drivers/nvmem/Kconfig        | 15 ++++----
 drivers/nvmem/Makefile       |  5 +--
 drivers/nvmem/zynqmp_nvmem.c | 86 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 96 insertions(+), 10 deletions(-)
 create mode 100644 drivers/nvmem/zynqmp_nvmem.c

diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index 0a7a470e..2edb142 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -181,15 +181,14 @@ config RAVE_SP_EEPROM
 	help
 	  Say y here to enable Rave SP EEPROM support.
 
-config SC27XX_EFUSE
-	tristate "Spreadtrum SC27XX eFuse Support"
-	depends on MFD_SC27XX_PMIC || COMPILE_TEST
-	depends on HAS_IOMEM
+config NVMEM_ZYNQMP
+	bool "Xilinx ZYNQMP SoC nvmem firmware support"
+	depends on ARCH_ZYNQMP
 	help
-	  This is a simple driver to dump specified values of Spreadtrum
-	  SC27XX PMICs from eFuse.
+	  This is a driver to access hardware related data like
+	  soc revision, IDCODE... etc by using the firmware
+	  interface.
 
-	  This driver can also be built as a module. If so, the module
-	  will be called nvmem-sc27xx-efuse.
+	  If sure, say yes. If unsure, say no.
 
 endif
diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
index 4e8c616..0b3abd7 100644
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -39,5 +39,6 @@ obj-$(CONFIG_NVMEM_SNVS_LPGPR)	+= nvmem_snvs_lpgpr.o
 nvmem_snvs_lpgpr-y		:= snvs_lpgpr.o
 obj-$(CONFIG_RAVE_SP_EEPROM)	+= nvmem-rave-sp-eeprom.o
 nvmem-rave-sp-eeprom-y		:= rave-sp-eeprom.o
-obj-$(CONFIG_SC27XX_EFUSE)	+= nvmem-sc27xx-efuse.o
-nvmem-sc27xx-efuse-y		:= sc27xx-efuse.o
+obj-$(CONFIG_NVMEM_ZYNQMP)     += nvmem_zynqmp_nvmem.o
+nvmem_zynqmp_nvmem-y           := zynqmp_nvmem.o
+
diff --git a/drivers/nvmem/zynqmp_nvmem.c b/drivers/nvmem/zynqmp_nvmem.c
new file mode 100644
index 0000000..b910864
--- /dev/null
+++ b/drivers/nvmem/zynqmp_nvmem.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Xilinx, Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/nvmem-provider.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/firmware/xlnx-zynqmp.h>
+
+#define SILICON_REVISION_MASK 0xF
+
+struct zynqmp_nvmem_data {
+	struct device *dev;
+	struct nvmem_device *nvmem;
+};
+
+static int zynqmp_nvmem_read(void *context, unsigned int offset,
+			     void *val, size_t bytes)
+{
+	int ret;
+	int idcode, version;
+	struct zynqmp_nvmem_data *priv = context;
+
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	if (!eemi_ops || !eemi_ops->get_chipid)
+		return -ENXIO;
+
+	ret = eemi_ops->get_chipid(&idcode, &version);
+	if (ret < 0)
+		return ret;
+
+	dev_dbg(priv->dev, "Read chipid val %x %x\n", idcode, version);
+	*(int *)val = version & SILICON_REVISION_MASK;
+
+	return 0;
+}
+
+static struct nvmem_config econfig = {
+	.name = "zynqmp-nvmem",
+	.owner = THIS_MODULE,
+	.word_size = 1,
+	.size = 1,
+	.read_only = true,
+};
+
+static const struct of_device_id zynqmp_nvmem_match[] = {
+	{ .compatible = "xlnx,zynqmp-nvmem-fw", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, zynqmp_nvmem_match);
+
+static int zynqmp_nvmem_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct zynqmp_nvmem_data *priv;
+
+	priv = devm_kzalloc(dev, sizeof(struct zynqmp_nvmem_data), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->dev = dev;
+	econfig.dev = dev;
+	econfig.reg_read = zynqmp_nvmem_read;
+	econfig.priv = priv;
+
+	priv->nvmem = devm_nvmem_register(dev, &econfig);
+
+	return PTR_ERR_OR_ZERO(priv->nvmem);
+}
+
+static struct platform_driver zynqmp_nvmem_driver = {
+	.probe = zynqmp_nvmem_probe,
+	.driver = {
+		.name = "zynqmp-nvmem",
+		.of_match_table = zynqmp_nvmem_match,
+	},
+};
+
+module_platform_driver(zynqmp_nvmem_driver);
+
+MODULE_AUTHOR("Michal Simek <michal.simek@xilinx.com>, Nava kishore Manne <navam@xilinx.com>");
+MODULE_DESCRIPTION("ZynqMP NVMEM driver");
+MODULE_LICENSE("GPL");
-- 
2.7.4

Re: [PATCH 2/3] dt-bindings: nvmem: Add bindings for ZynqMP nvmem driver

[Rob Herring]

On Sat, Oct 20, 2018 at 02:06:02PM +0530, Nava kishore Manne wrote:
> Add documentation to describe Xilinx ZynqMP nvmem driver
> bindings.
> 
> Signed-off-by: Nava kishore Manne <nava.manne@xilinx.com>
> ---
> Changes for v1:
> 		Created a Seperate(New) DT binding file as
> 		suggested by Rob.
> 
> Changes for RFC-V3:
>                 -None.
> 
> Changes for RFC-V2:
>                 -Moved nvmem_firmware node as a child to
>                  firwmare node.
> 
>  .../bindings/nvmem/xlnx,zynqmp-nvmem.txt           | 37 ++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt

Before I okay any ZynqMP firmware related bindings, I want to see a 
complete binding, not things added one by one.

Rob

[PATCH 2/3] dt-bindings: nvmem: Add bindings for ZynqMP nvmem driver

[Rob Herring]

On Sat, Oct 20, 2018 at 02:06:02PM +0530, Nava kishore Manne wrote:
> Add documentation to describe Xilinx ZynqMP nvmem driver
> bindings.
> 
> Signed-off-by: Nava kishore Manne <nava.manne@xilinx.com>
> ---
> Changes for v1:
> 		Created a Seperate(New) DT binding file as
> 		suggested by Rob.
> 
> Changes for RFC-V3:
>                 -None.
> 
> Changes for RFC-V2:
>                 -Moved nvmem_firmware node as a child to
>                  firwmare node.
> 
>  .../bindings/nvmem/xlnx,zynqmp-nvmem.txt           | 37 ++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt

Before I okay any ZynqMP firmware related bindings, I want to see a 
complete binding, not things added one by one.

Rob