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, 159 insertions, 0 deletions

diff --git a/include/dm/device.h b/include/dm/device.h
new file mode 100644
index 0000000..4cd38ed
--- /dev/null
+++ b/include/dm/device.h
@@ -0,0 +1,159 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * (C) Copyright 2012
+ * Pavel Herrmann <morpheus.ibis@gmail.com>
+ * Marek Vasut <marex@denx.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _DM_DEVICE_H
+#define _DM_DEVICE_H
+
+#include <dm/uclass-id.h>
+#include <linker_lists.h>
+#include <linux/list.h>
+
+struct driver_info;
+
+/* Driver is active (probed). Cleared when it is removed */
+#define DM_FLAG_ACTIVATED	(1 << 0)
+
+/* DM is responsible for allocating and freeing platdata */
+#define DM_FLAG_ALLOC_PDATA	(2 << 0)
+
+/**
+ * struct device - An instance of a driver
+ *
+ * This holds information about a device, which is a driver bound to a
+ * particular port or peripheral (essentially a driver instance).
+ *
+ * A device will come into existence through a 'bind' call, either due to
+ * a U_BOOT_DEVICE() macro (in which case platdata is non-NULL) or a node
+ * in the device tree (in which case of_offset is >= 0). In the latter case
+ * we translate the device tree information into platdata in a function
+ * implemented by the driver ofdata_to_platdata method (called just before the
+ * probe method if the device has a device tree node.
+ *
+ * All three of platdata, priv and uclass_priv can be allocated by the
+ * driver, or you can use the auto_alloc_size members of struct driver and
+ * struct uclass_driver to have driver model do this automatically.
+ *
+ * @driver: The driver used by this device
+ * @name: Name of device, typically the FDT node name
+ * @platdata: Configuration data for this device
+ * @of_offset: Device tree node offset for this device (- for none)
+ * @parent: Parent of this device, or NULL for the top level device
+ * @priv: Private data for this device
+ * @uclass: Pointer to uclass for this device
+ * @uclass_priv: The uclass's private data for this device
+ * @uclass_node: Used by uclass to link its devices
+ * @child_head: List of children of this device
+ * @sibling_node: Next device in list of all devices
+ * @flags: Flags for this device DM_FLAG_...
+ */
+struct device {
+	struct driver *driver;
+	const char *name;
+	void *platdata;
+	int of_offset;
+	struct device *parent;
+	void *priv;
+	struct uclass *uclass;
+	void *uclass_priv;
+	struct list_head uclass_node;
+	struct list_head child_head;
+	struct list_head sibling_node;
+	uint32_t flags;
+};
+
+/* Returns the operations for a device */
+#define device_get_ops(dev)	(dev->driver->ops)
+
+/* Returns non-zero if the device is active (probed and not removed) */
+#define device_active(dev)	((dev)->flags & DM_FLAG_ACTIVATED)
+
+/**
+ * struct device_id - Lists the compatible strings supported by a driver
+ * @compatible: Compatible string
+ * @data: Data for this compatible string
+ */
+struct device_id {
+	const char *compatible;
+	ulong data;
+};
+
+/**
+ * struct driver - A driver for a feature or peripheral
+ *
+ * This holds methods for setting up a new device, and also removing it.
+ * The device needs information to set itself up - this is provided either
+ * by platdata or a device tree node (which we find by looking up
+ * matching compatible strings with of_match).
+ *
+ * Drivers all belong to a uclass, representing a class of devices of the
+ * same type. Common elements of the drivers can be implemented in the uclass,
+ * or the uclass can provide a consistent interface to the drivers within
+ * it.
+ *
+ * @name: Device name
+ * @id: Identiies the uclass we belong to
+ * @of_match: List of compatible strings to match, and any identifying data
+ * for each.
+ * @bind: Called to bind a device to its driver
+ * @probe: Called to probe a device, i.e. activate it
+ * @remove: Called to remove a device, i.e. de-activate it
+ * @unbind: Called to unbind a device from its driver
+ * @ofdata_to_platdata: Called before probe to decode device tree data
+ * @priv_auto_alloc_size: If non-zero this is the size of the private data
+ * to be allocated in the device's ->priv pointer. If zero, then the driver
+ * is responsible for allocating any data required.
+ * @platdata_auto_alloc_size: If non-zero this is the size of the
+ * platform data to be allocated in the device's ->platdata pointer.
+ * This is typically only useful for device-tree-aware drivers (those with
+ * an of_match), since drivers which use platdata will have the data
+ * provided in the U_BOOT_DEVICE() instantiation.
+ * ops: Driver-specific operations. This is typically a list of function
+ * pointers defined by the driver, to implement driver functions required by
+ * the uclass.
+ */
+struct driver {
+	char *name;
+	enum uclass_id id;
+	const struct device_id *of_match;
+	int (*bind)(struct device *dev);
+	int (*probe)(struct device *dev);
+	int (*remove)(struct device *dev);
+	int (*unbind)(struct device *dev);
+	int (*ofdata_to_platdata)(struct device *dev);
+	int priv_auto_alloc_size;
+	int platdata_auto_alloc_size;
+	const void *ops;	/* driver-specific operations */
+};
+
+/* Declare a new U-Boot driver */
+#define U_BOOT_DRIVER(__name)						\
+	ll_entry_declare(struct driver, __name, driver)
+
+/**
+ * dev_get_platdata() - Get the platform data for a device
+ *
+ * This checks that dev is not NULL, but no other checks for now
+ *
+ * @dev		Device to check
+ * @return platform data, or NULL if none
+ */
+void *dev_get_platdata(struct device *dev);
+
+/**
+ * dev_get_priv() - Get the private data for a device
+ *
+ * This checks that dev is not NULL, but no other checks for now
+ *
+ * @dev		Device to check
+ * @return private data, or NULL if none
+ */
+void *dev_get_priv(struct device *dev);
+
+#endif