Add Amlogic secure monitor and NVMEM drivers

From: Carlo Caione <[email protected]>

Introduce a driver to provide calls into secure monitor mode.

In the Amlogic SoCs these calls are used for multiple reasons: access to NVMEM, set USB boot, enable JTAG, etc...

Signed-off-by Carlo Caione <[email protected]>

From: Carlo Caione <[email protected]>

Add Amlogic EFUSE driver to access hardware data like ethernet address, serial number or IDs.

Signed-off-by Carlo Caione <[email protected]>

---
  drivers/nvmem/Kconfig       | 10 +++++
  drivers/nvmem/Makefile      |  2 +
  drivers/nvmem/meson-efuse.c | 93 +++++++++++++++++++++++++++++++++++++++++++++
  3 files changed, 105 insertions(+)

create mode 100644 drivers/nvmem/meson-efuse.c

drivers/nvmem/Kconfig +10 -0

index 3041d48..87900d3 100644
@@ -101,4 +101,14 @@ config NVMEM_VF610_OCOTP
  	  This driver can also be build as a module. If so, the module will
  	  be called nvmem-vf610-ocotp.
 
+config MESON_EFUSE
+	tristate "Amlogic eFuse Support"
+	depends on (ARCH_MESON || COMPILE_TEST) && MESON_SM
+	help
+	  This is a driver to retrieve specific values from the eFuse found on
+	  the Amlogic Meson SoCs.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called nvmem_meson_efuse.
+
  endif

drivers/nvmem/Makefile +2 -0

index 45ab1ae..8f942a0 100644
@@ -22,3 +22,5 @@ obj-$(CONFIG_NVMEM_SUNXI_SID)	+= nvmem_sunxi_sid.o
  nvmem_sunxi_sid-y		:= sunxi_sid.o
  obj-$(CONFIG_NVMEM_VF610_OCOTP)	+= nvmem-vf610-ocotp.o
  nvmem-vf610-ocotp-y		:= vf610-ocotp.o
+obj-$(CONFIG_MESON_EFUSE)	+= nvmem_meson_efuse.o
+nvmem_meson_efuse-y		:= meson-efuse.o

drivers/nvmem/meson-efuse.c new file +93 -0

new file mode 100644
index 0000000..f207c3b
@@ -0,0 +1,93 @@
+/*
+ * Amlogic eFuse Driver
+ *
+ * Copyright (c) 2016 Endless Computers, Inc.
+ * Author: Carlo Caione <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/module.h>
+#include <linux/nvmem-provider.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+#include <linux/firmware/meson/meson_sm.h>
+
+static int meson_efuse_read(void *context, unsigned int offset,
+			    void *val, size_t bytes)
+{
+	u8 *buf = val;
+	int ret;
+
+	ret = meson_sm_call_read(buf, SM_EFUSE_READ, offset,
+				 bytes, 0, 0, 0);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static struct nvmem_config econfig = {
+	.name = "meson-efuse",
+	.owner = THIS_MODULE,
+	.stride = 1,
+	.word_size = 1,
+	.read_only = true,
+};
+
+static const struct of_device_id meson_efuse_match[] = {
+	{ .compatible = "amlogic,meson-gxbb-efuse", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, meson_efuse_match);
+
+static int meson_efuse_probe(struct platform_device *pdev)
+{
+	struct nvmem_device *nvmem;
+	unsigned int size;
+
+	if (meson_sm_call(SM_EFUSE_USER_MAX, &size, 0, 0, 0, 0, 0) < 0)
+		return -EINVAL;
+
+	econfig.dev = &pdev->dev;
+	econfig.reg_read = meson_efuse_read;
+	econfig.size = size;
+
+	nvmem = nvmem_register(&econfig);
+	if (IS_ERR(nvmem))
+		return PTR_ERR(nvmem);
+
+	platform_set_drvdata(pdev, nvmem);
+
+	return 0;
+}
+
+static int meson_efuse_remove(struct platform_device *pdev)
+{
+	struct nvmem_device *nvmem = platform_get_drvdata(pdev);
+
+	return nvmem_unregister(nvmem);
+}
+
+static struct platform_driver meson_efuse_driver = {
+	.probe = meson_efuse_probe,
+	.remove = meson_efuse_remove,
+	.driver = {
+		.name = "meson-efuse",
+		.of_match_table = meson_efuse_match,
+	},
+};
+
+module_platform_driver(meson_efuse_driver);
+
+MODULE_AUTHOR("Carlo Caione <[email protected]>");
+MODULE_DESCRIPTION("Amlogic Meson NVMEM driver");
+MODULE_LICENSE("GPL v2");

Quoted 6 lines · Carlo Caione

From: Carlo Caione <[email protected]>

Add Amlogic EFUSE driver to access hardware data like ethernet address, serial number or IDs.

Signed-off-by Carlo Caione <[email protected]>

Patch looks good to me,

Looks like there are some dependencies to this patch w.r.t sm_calls, it would be easy to take this series from single tree.

Just incase you want to take this patch via some other tree, here is Ack.

Acked-by Srinivas Kandagatla <[email protected]>

From: Carlo Caione <[email protected]>

This patch add the bindings document of Amlogic eFuse driver.

Signed-off-by Carlo Caione <[email protected]>

Acked-by Rob Herring <[email protected]>

---
  .../devicetree/bindings/nvmem/amlogic-efuse.txt    | 39 ++++++++++++++++++++++
  1 file changed, 39 insertions(+)

create mode 100644 Documentation/devicetree/bindings/nvmem/amlogic-efuse.txt

Documentation/devicetree/bindings/nvmem/amlogic-efuse.txt new file +39 -0

new file mode 100644
index 0000000..fafd85b
@@ -0,0 +1,39 @@
+= Amlogic eFuse device tree bindings =
+
+Required properties:
+- compatible: should be "amlogic,meson-gxbb-efuse"
+
+= Data cells =
+Are child nodes of eFuse, bindings of which as described in
+bindings/nvmem/nvmem.txt
+
+Example:
+
+	efuse: efuse {
+		compatible = "amlogic,meson-gxbb-efuse";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		sn: sn at 14 {
+			reg = <0x14 0x10>;
+		};
+
+		eth_mac: eth_mac at 34 {
+			reg = <0x34 0x10>;
+		};
+
+		bid: bid at 46 {
+			reg = <0x46 0x30>;
+		};
+	};
+
+= Data consumers =
+Are device nodes which consume nvmem data cells.
+
+For example:
+
+	eth_mac {
+		...
+		nvmem-cells = <&eth_mac>;
+		nvmem-cell-names = "eth_mac";
+	};