Some boards have encoded information, e.g. hard-wired GPIOs on a GPIO
expander, read-only memory ICs, etc. that carry information about the
hardware.
Add a uclass that encapsulates device information of such a kind and
makes them accessible in a uniform manner. The devices of this uclass
expose methods to read generic data types (integers, strings, booleans)
to encode the information provided by the hardware.
Signed-off-by: Mario Six <mario....@gdsys.cc>
---
drivers/Kconfig | 2 ++
drivers/Makefile | 1 +
drivers/devinfo/Kconfig | 17 ++++++++++++
drivers/devinfo/Makefile | 9 +++++++
drivers/devinfo/devinfo-uclass.c | 55 +++++++++++++++++++++++++++++++++++++++
include/devinfo.h | 56 ++++++++++++++++++++++++++++++++++++++++
include/dm/uclass-id.h | 1 +
7 files changed, 141 insertions(+)
create mode 100644 drivers/devinfo/Kconfig
create mode 100644 drivers/devinfo/Makefile
create mode 100644 drivers/devinfo/devinfo-uclass.c
create mode 100644 include/devinfo.h
diff --git a/drivers/Kconfig b/drivers/Kconfig
index c2e813f5ad..34777d9013 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -22,6 +22,8 @@ source "drivers/ddr/Kconfig"
source "drivers/demo/Kconfig"
+source "drivers/devinfo/Kconfig"
+
source "drivers/ddr/fsl/Kconfig"
source "drivers/dfu/Kconfig"
diff --git a/drivers/Makefile b/drivers/Makefile
index 6846d181aa..208b68081e 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -72,6 +72,7 @@ obj-y += block/
obj-$(CONFIG_BOOTCOUNT_LIMIT) += bootcount/
obj-$(CONFIG_CPU) += cpu/
obj-y += crypto/
+obj-y += devinfo/
obj-y += firmware/
obj-$(CONFIG_FPGA) += fpga/
obj-y += misc/
diff --git a/drivers/devinfo/Kconfig b/drivers/devinfo/Kconfig
new file mode 100644
index 0000000000..0de70b410e
--- /dev/null
+++ b/drivers/devinfo/Kconfig
@@ -0,0 +1,17 @@
+menuconfig DEVINFO
+ bool "Device Information"
+ help
+ Support methods to query hardware configurations from internal
+ mechanisms (e.g. reading GPIO values, determining the presence of
+ devices on busses, etc.). This enables the usage of U-Boot with
+ modular board architectures.
+
+if DEVINFO
+
+
+config DEVINFO_GAZERBEAM
+ bool "Enable device information for the Gazerbeam board"
+ help
+ Support querying device information for the gdsys Gazerbeam board.
+
+endif
diff --git a/drivers/devinfo/Makefile b/drivers/devinfo/Makefile
new file mode 100644
index 0000000000..0a9cad4a15
--- /dev/null
+++ b/drivers/devinfo/Makefile
@@ -0,0 +1,9 @@
+#
+# (C) Copyright 2017
+# Mario Six, Guntermann & Drunck GmbH, mario....@gdsys.cc
+#
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+obj-$(CONFIG_DEVINFO) += devinfo-uclass.o
+obj-$(CONFIG_DEVINFO_GAZERBEAM) += gazerbeam.o
diff --git a/drivers/devinfo/devinfo-uclass.c b/drivers/devinfo/devinfo-uclass.c
new file mode 100644
index 0000000000..89bbe8f343
--- /dev/null
+++ b/drivers/devinfo/devinfo-uclass.c
@@ -0,0 +1,55 @@
+/*
+ * (C) Copyright 2017
+ * Mario Six, Guntermann & Drunck GmbH, mario....@gdsys.cc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <devinfo.h>
+
+int devinfo_detect(struct udevice *dev)
+{
+ struct devinfo_ops *ops = devinfo_get_ops(dev);
+
+ if (!ops->detect)
+ return -ENOSYS;
+
+ return ops->detect(dev);
+}
+
+int devinfo_get_bool(struct udevice *dev, int id, bool *val)
+{
+ struct devinfo_ops *ops = devinfo_get_ops(dev);
+
+ if (!ops->get_bool)
+ return -ENOSYS;
+
+ return ops->get_bool(dev, id, val);
+}
+
+int devinfo_get_int(struct udevice *dev, int id, int *val)
+{
+ struct devinfo_ops *ops = devinfo_get_ops(dev);
+
+ if (!ops->get_int)
+ return -ENOSYS;
+
+ return ops->get_int(dev, id, val);
+}
+
+int devinfo_get_str(struct udevice *dev, int id, char *val)
+{
+ struct devinfo_ops *ops = devinfo_get_ops(dev);
+
+ if (!ops->get_str)
+ return -ENOSYS;
+
+ return ops->get_str(dev, id, val);
+}
+
+UCLASS_DRIVER(devinfo) = {
+ .id = UCLASS_DEVINFO,
+ .name = "devinfo",
+};
diff --git a/include/devinfo.h b/include/devinfo.h
new file mode 100644
index 0000000000..90014c27c4
--- /dev/null
+++ b/include/devinfo.h
@@ -0,0 +1,56 @@
+/*
+ * (C) Copyright 2017
+ * Mario Six, Guntermann & Drunck GmbH, mario....@gdsys.cc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+struct devinfo_ops {
+ int (*detect)(struct udevice *dev);
+ int (*get_bool)(struct udevice *dev, int id, bool *val);
+ int (*get_int)(struct udevice *dev, int id, int *val);
+ int (*get_str)(struct udevice *dev, int id, char *val);
+};
+
+#define devinfo_get_ops(dev) ((struct devinfo_ops *)(dev)->driver->ops)
+
+/**
+ * devinfo_detect() - Run the hardware info detection procedure for this
device.
+ *
+ * @dev: The devinfo instance to gather the data.
+ * @return 0 if OK, -ve on error.
+ */
+int devinfo_detect(struct udevice *dev);
+
+/**
+ * devinfo_get_bool() - Read a specific bool data value that describes the
+ * hardware setup.
+ *
+ * @dev: The devinfo instance to gather the data.
+ * @id: A unique identifier for the bool value to be read.
+ * @val: Pointer to a buffer that receives the value read.
+ * @return 0 if OK, -ve on error.
+ */
+int devinfo_get_bool(struct udevice *dev, int id, bool *val);
+
+/**
+ * devinfo_get_int() - Read a specific int data value that describes the
+ * hardware setup.
+ *
+ * @dev: The devinfo instance to gather the data.
+ * @id: A unique identifier for the int value to be read.
+ * @val: Pointer to a buffer that receives the value read.
+ * @return 0 if OK, -ve on error.
+ */
+int devinfo_get_int(struct udevice *dev, int id, int *val);
+
+/**
+ * devinfo_get_str() - Read a specific string data value that describes the
+ * hardware setup.
+ *
+ * @dev: The devinfo instance to gather the data.
+ * @id: A unique identifier for the string value to be read.
+ * @val: Pointer to a buffer that receives the value read.
+ * @return 0 if OK, -ve on error.
+ */
+int devinfo_get_str(struct udevice *dev, int id, char *val);
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index 07fabc3ce6..58925be037 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -33,6 +33,7 @@ enum uclass_id {
UCLASS_CPU, /* CPU, typically part of an SoC */
UCLASS_CROS_EC, /* Chrome OS EC */
UCLASS_DISPLAY, /* Display (e.g. DisplayPort, HDMI) */
+ UCLASS_DEVINFO, /* Device information from hardware */
UCLASS_DMA, /* Direct Memory Access */
UCLASS_EFI, /* EFI managed devices */
UCLASS_ETH, /* Ethernet device */
--
2.16.1
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