dm: Add base driver model support

Add driver model functionality for generic board.

This includes data structures and base code for registering devices and
uclasses (groups of devices with the same purpose, e.g. all I2C ports will
be in the same uclass).

The feature is enabled with CONFIG_DM.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Pavel Herrmann <morpheus.ibis@gmail.com>
Signed-off-by: Viktor Křivák <viktor.krivak@gmail.com>
Signed-off-by: Tomas Hlavacek <tmshlvck@gmail.com>

1 files changed, 102 insertions, 0 deletions

diff --git a/drivers/core/root.c b/drivers/core/root.c
new file mode 100644
index 0000000000..407bc0d046
--- /dev/null
+++ b/drivers/core/root.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * (C) Copyright 2012
+ * Pavel Herrmann <morpheus.ibis@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <malloc.h>
+#include <dm/device.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
+#include <dm/platdata.h>
+#include <dm/uclass.h>
+#include <dm/util.h>
+#include <linux/list.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const struct driver_info root_info = {
+	.name		= "root_driver",
+};
+
+struct device *dm_root(void)
+{
+	if (!gd->dm_root) {
+		dm_warn("Virtual root driver does not exist!\n");
+		return NULL;
+	}
+
+	return gd->dm_root;
+}
+
+int dm_init(void)
+{
+	int ret;
+
+	if (gd->dm_root) {
+		dm_warn("Virtual root driver already exists!\n");
+		return -EINVAL;
+	}
+	INIT_LIST_HEAD(&gd->uclass_root);
+
+	ret = device_bind_by_name(NULL, &root_info, &gd->dm_root);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+int dm_scan_platdata(void)
+{
+	int ret;
+
+	ret = lists_bind_drivers(gd->dm_root);
+	if (ret == -ENOENT) {
+		dm_warn("Some drivers were not found\n");
+		ret = 0;
+	}
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+#ifdef CONFIG_OF_CONTROL
+int dm_scan_fdt(const void *blob)
+{
+	int offset = 0;
+	int ret = 0, err;
+	int depth = 0;
+
+	do {
+		offset = fdt_next_node(blob, offset, &depth);
+		if (offset > 0 && depth == 1) {
+			err = lists_bind_fdt(gd->dm_root, blob, offset);
+			if (err && !ret)
+				ret = err;
+		}
+	} while (offset > 0);
+
+	if (ret)
+		dm_warn("Some drivers failed to bind\n");
+
+	return ret;
+}
+#endif
+
+/* This is the root driver - all drivers are children of this */
+U_BOOT_DRIVER(root_driver) = {
+	.name	= "root_driver",
+	.id	= UCLASS_ROOT,
+};
+
+/* This is the root uclass */
+UCLASS_DRIVER(root) = {
+	.name	= "root",
+	.id	= UCLASS_ROOT,
+};