[mirror_ubuntu-kernels.git] / include / linux / fwnode.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * fwnode.h - Firmware device node object handle type definition.
 *
 * Copyright (C) 2015, Intel Corporation
 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 */

#ifndef _LINUX_FWNODE_H_
#define _LINUX_FWNODE_H_

#include <linux/types.h>
#include <linux/list.h>
#include <linux/err.h>

struct fwnode_operations;
struct device;

/*
 * fwnode link flags
 *
 * LINKS_ADDED:	The fwnode has already be parsed to add fwnode links.
 * NOT_DEVICE:	The fwnode will never be populated as a struct device.
 * INITIALIZED: The hardware corresponding to fwnode has been initialized.
 */
#define FWNODE_FLAG_LINKS_ADDED		BIT(0)
#define FWNODE_FLAG_NOT_DEVICE		BIT(1)
#define FWNODE_FLAG_INITIALIZED		BIT(2)

struct fwnode_handle {
	struct fwnode_handle *secondary;
	const struct fwnode_operations *ops;
	struct device *dev;
	struct list_head suppliers;
	struct list_head consumers;
	u8 flags;
};

struct fwnode_link {
	struct fwnode_handle *supplier;
	struct list_head s_hook;
	struct fwnode_handle *consumer;
	struct list_head c_hook;
};

/**
 * struct fwnode_endpoint - Fwnode graph endpoint
 * @port: Port number
 * @id: Endpoint id
 * @local_fwnode: reference to the related fwnode
 */
struct fwnode_endpoint {
	unsigned int port;
	unsigned int id;
	const struct fwnode_handle *local_fwnode;
};

/*
 * ports and endpoints defined as software_nodes should all follow a common
 * naming scheme; use these macros to ensure commonality.
 */
#define SWNODE_GRAPH_PORT_NAME_FMT		"port@%u"
#define SWNODE_GRAPH_ENDPOINT_NAME_FMT		"endpoint@%u"

#define NR_FWNODE_REFERENCE_ARGS	8

/**
 * struct fwnode_reference_args - Fwnode reference with additional arguments
 * @fwnode:- A reference to the base fwnode
 * @nargs: Number of elements in @args array
 * @args: Integer arguments on the fwnode
 */
struct fwnode_reference_args {
	struct fwnode_handle *fwnode;
	unsigned int nargs;
	u64 args[NR_FWNODE_REFERENCE_ARGS];
};

/**
 * struct fwnode_operations - Operations for fwnode interface
 * @get: Get a reference to an fwnode.
 * @put: Put a reference to an fwnode.
 * @device_is_available: Return true if the device is available.
 * @device_get_match_data: Return the device driver match data.
 * @property_present: Return true if a property is present.
 * @property_read_int_array: Read an array of integer properties. Return zero on
 *			     success, a negative error code otherwise.
 * @property_read_string_array: Read an array of string properties. Return zero
 *				on success, a negative error code otherwise.
 * @get_name: Return the name of an fwnode.
 * @get_name_prefix: Get a prefix for a node (for printing purposes).
 * @get_parent: Return the parent of an fwnode.
 * @get_next_child_node: Return the next child node in an iteration.
 * @get_named_child_node: Return a child node with a given name.
 * @get_reference_args: Return a reference pointed to by a property, with args
 * @graph_get_next_endpoint: Return an endpoint node in an iteration.
 * @graph_get_remote_endpoint: Return the remote endpoint node of a local
 *			       endpoint node.
 * @graph_get_port_parent: Return the parent node of a port node.
 * @graph_parse_endpoint: Parse endpoint for port and endpoint id.
 * @add_links:	Create fwnode links to all the suppliers of the fwnode. Return
 *		zero on success, a negative error code otherwise.
 */
struct fwnode_operations {
	struct fwnode_handle *(*get)(struct fwnode_handle *fwnode);
	void (*put)(struct fwnode_handle *fwnode);
	bool (*device_is_available)(const struct fwnode_handle *fwnode);
	const void *(*device_get_match_data)(const struct fwnode_handle *fwnode,
					     const struct device *dev);
	bool (*property_present)(const struct fwnode_handle *fwnode,
				 const char *propname);
	int (*property_read_int_array)(const struct fwnode_handle *fwnode,
				       const char *propname,
				       unsigned int elem_size, void *val,
				       size_t nval);
	int
	(*property_read_string_array)(const struct fwnode_handle *fwnode_handle,
				      const char *propname, const char **val,
				      size_t nval);
	const char *(*get_name)(const struct fwnode_handle *fwnode);
	const char *(*get_name_prefix)(const struct fwnode_handle *fwnode);
	struct fwnode_handle *(*get_parent)(const struct fwnode_handle *fwnode);
	struct fwnode_handle *
	(*get_next_child_node)(const struct fwnode_handle *fwnode,
			       struct fwnode_handle *child);
	struct fwnode_handle *
	(*get_named_child_node)(const struct fwnode_handle *fwnode,
				const char *name);
	int (*get_reference_args)(const struct fwnode_handle *fwnode,
				  const char *prop, const char *nargs_prop,
				  unsigned int nargs, unsigned int index,
				  struct fwnode_reference_args *args);
	struct fwnode_handle *
	(*graph_get_next_endpoint)(const struct fwnode_handle *fwnode,
				   struct fwnode_handle *prev);
	struct fwnode_handle *
	(*graph_get_remote_endpoint)(const struct fwnode_handle *fwnode);
	struct fwnode_handle *
	(*graph_get_port_parent)(struct fwnode_handle *fwnode);
	int (*graph_parse_endpoint)(const struct fwnode_handle *fwnode,
				    struct fwnode_endpoint *endpoint);
	int (*add_links)(struct fwnode_handle *fwnode);
};

#define fwnode_has_op(fwnode, op)				\
	((fwnode) && (fwnode)->ops && (fwnode)->ops->op)
#define fwnode_call_int_op(fwnode, op, ...)				\
	(fwnode ? (fwnode_has_op(fwnode, op) ?				\
		   (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : -ENXIO) : \
	 -EINVAL)

#define fwnode_call_bool_op(fwnode, op, ...)		\
	(fwnode_has_op(fwnode, op) ?			\
	 (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : false)

#define fwnode_call_ptr_op(fwnode, op, ...)		\
	(fwnode_has_op(fwnode, op) ?			\
	 (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : NULL)
#define fwnode_call_void_op(fwnode, op, ...)				\
	do {								\
		if (fwnode_has_op(fwnode, op))				\
			(fwnode)->ops->op(fwnode, ## __VA_ARGS__);	\
	} while (false)
#define get_dev_from_fwnode(fwnode)	get_device((fwnode)->dev)

static inline void fwnode_init(struct fwnode_handle *fwnode,
			       const struct fwnode_operations *ops)
{
	fwnode->ops = ops;
	INIT_LIST_HEAD(&fwnode->consumers);
	INIT_LIST_HEAD(&fwnode->suppliers);
}

static inline void fwnode_dev_initialized(struct fwnode_handle *fwnode,
					  bool initialized)
{
	if (IS_ERR_OR_NULL(fwnode))
		return;

	if (initialized)
		fwnode->flags |= FWNODE_FLAG_INITIALIZED;
	else
		fwnode->flags &= ~FWNODE_FLAG_INITIALIZED;
}

extern u32 fw_devlink_get_flags(void);
extern bool fw_devlink_is_strict(void);
int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup);
void fwnode_links_purge(struct fwnode_handle *fwnode);

#endif
Commit	Line	Data
d2912cb1	1	/* SPDX-License-Identifier: GPL-2.0-only */
ce793486 RW	2	/*
	3	* fwnode.h - Firmware device node object handle type definition.
	4	*
	5	* Copyright (C) 2015, Intel Corporation
	6	* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
ce793486 RW	7	*/
	8
	9	#ifndef _LINUX_FWNODE_H_
	10	#define _LINUX_FWNODE_H_
	11
3708184a	12	#include <linux/types.h>
7b337cb3	13	#include <linux/list.h>
74c782cf	14	#include <linux/err.h>
3708184a	15
3708184a	16	struct fwnode_operations;
b283f157	17	struct device;
3708184a	18
c2c724c8 SK	19	/*
	20	* fwnode link flags
	21	*
74c782cf SK	22	* LINKS_ADDED: The fwnode has already be parsed to add fwnode links.
	23	* NOT_DEVICE: The fwnode will never be populated as a struct device.
	24	* INITIALIZED: The hardware corresponding to fwnode has been initialized.
c2c724c8 SK	25	*/
c2c724c8 SK	26	#define FWNODE_FLAG_LINKS_ADDED BIT(0)
9528e0d9	27	#define FWNODE_FLAG_NOT_DEVICE BIT(1)
74c782cf	28	#define FWNODE_FLAG_INITIALIZED BIT(2)
c2c724c8	29
ce793486	30	struct fwnode_handle {
97badf87	31	struct fwnode_handle *secondary;
3708184a	32	const struct fwnode_operations *ops;
372a67c0	33	struct device *dev;
7b337cb3 SK	34	struct list_head suppliers;
7b337cb3 SK	35	struct list_head consumers;
c2c724c8	36	u8 flags;
7b337cb3 SK	37	};
	38
	39	struct fwnode_link {
	40	struct fwnode_handle *supplier;
	41	struct list_head s_hook;
	42	struct fwnode_handle *consumer;
	43	struct list_head c_hook;
ce793486 RW	44	};
ce793486 RW	45
2bd5452d SA	46	/**
	47	* struct fwnode_endpoint - Fwnode graph endpoint
	48	* @port: Port number
	49	* @id: Endpoint id
	50	* @local_fwnode: reference to the related fwnode
	51	*/
	52	struct fwnode_endpoint {
	53	unsigned int port;
	54	unsigned int id;
	55	const struct fwnode_handle *local_fwnode;
	56	};
	57
529b56a8 DS	58	/*
	59	* ports and endpoints defined as software_nodes should all follow a common
	60	* naming scheme; use these macros to ensure commonality.
	61	*/
	62	#define SWNODE_GRAPH_PORT_NAME_FMT "port@%u"
	63	#define SWNODE_GRAPH_ENDPOINT_NAME_FMT "endpoint@%u"
	64
3e3119d3 SA	65	#define NR_FWNODE_REFERENCE_ARGS 8
	66
	67	/**
	68	* struct fwnode_reference_args - Fwnode reference with additional arguments
	69	* @fwnode:- A reference to the base fwnode
	70	* @nargs: Number of elements in @args array
	71	* @args: Integer arguments on the fwnode
	72	*/
	73	struct fwnode_reference_args {
	74	struct fwnode_handle *fwnode;
	75	unsigned int nargs;
977d5ad3	76	u64 args[NR_FWNODE_REFERENCE_ARGS];
3e3119d3 SA	77	};
3e3119d3 SA	78
3708184a SA	79	/**
	80	* struct fwnode_operations - Operations for fwnode interface
	81	* @get: Get a reference to an fwnode.
	82	* @put: Put a reference to an fwnode.
8ed61d36	83	* @device_is_available: Return true if the device is available.
b283f157	84	* @device_get_match_data: Return the device driver match data.
3708184a	85	* @property_present: Return true if a property is present.
8ed61d36 HK	86	* @property_read_int_array: Read an array of integer properties. Return zero on
8ed61d36 HK	87	* success, a negative error code otherwise.
3708184a SA	88	* @property_read_string_array: Read an array of string properties. Return zero
3708184a SA	89	* on success, a negative error code otherwise.
bc0500c1	90	* @get_name: Return the name of an fwnode.
e7e242bc	91	* @get_name_prefix: Get a prefix for a node (for printing purposes).
3708184a SA	92	* @get_parent: Return the parent of an fwnode.
	93	* @get_next_child_node: Return the next child node in an iteration.
	94	* @get_named_child_node: Return a child node with a given name.
3e3119d3	95	* @get_reference_args: Return a reference pointed to by a property, with args
3b27d00e SA	96	* @graph_get_next_endpoint: Return an endpoint node in an iteration.
	97	* @graph_get_remote_endpoint: Return the remote endpoint node of a local
	98	* endpoint node.
	99	* @graph_get_port_parent: Return the parent node of a port node.
	100	* @graph_parse_endpoint: Parse endpoint for port and endpoint id.
04f63c21 SK	101	* @add_links: Create fwnode links to all the suppliers of the fwnode. Return
04f63c21 SK	102	* zero on success, a negative error code otherwise.
3708184a SA	103	*/
3708184a SA	104	struct fwnode_operations {
cf89a31c	105	struct fwnode_handle (get)(struct fwnode_handle *fwnode);
3708184a	106	void (put)(struct fwnode_handle fwnode);
37ba983c	107	bool (device_is_available)(const struct fwnode_handle fwnode);
67dcc26d AS	108	const void (device_get_match_data)(const struct fwnode_handle *fwnode,
67dcc26d AS	109	const struct device *dev);
37ba983c	110	bool (property_present)(const struct fwnode_handle fwnode,
3708184a	111	const char *propname);
37ba983c	112	int (property_read_int_array)(const struct fwnode_handle fwnode,
3708184a SA	113	const char *propname,
	114	unsigned int elem_size, void *val,
	115	size_t nval);
37ba983c SA	116	int
	117	(property_read_string_array)(const struct fwnode_handle fwnode_handle,
	118	const char propname, const char *val,
	119	size_t nval);
bc0500c1	120	const char (get_name)(const struct fwnode_handle *fwnode);
e7e242bc	121	const char (get_name_prefix)(const struct fwnode_handle *fwnode);
37ba983c	122	struct fwnode_handle (get_parent)(const struct fwnode_handle *fwnode);
3708184a	123	struct fwnode_handle *
37ba983c	124	(get_next_child_node)(const struct fwnode_handle fwnode,
3708184a SA	125	struct fwnode_handle *child);
3708184a SA	126	struct fwnode_handle *
37ba983c SA	127	(get_named_child_node)(const struct fwnode_handle fwnode,
37ba983c SA	128	const char *name);
3e3119d3 SA	129	int (get_reference_args)(const struct fwnode_handle fwnode,
	130	const char prop, const char nargs_prop,
	131	unsigned int nargs, unsigned int index,
	132	struct fwnode_reference_args *args);
3b27d00e	133	struct fwnode_handle *
37ba983c	134	(graph_get_next_endpoint)(const struct fwnode_handle fwnode,
3b27d00e SA	135	struct fwnode_handle *prev);
3b27d00e SA	136	struct fwnode_handle *
37ba983c	137	(graph_get_remote_endpoint)(const struct fwnode_handle fwnode);
3b27d00e SA	138	struct fwnode_handle *
3b27d00e SA	139	(graph_get_port_parent)(struct fwnode_handle fwnode);
37ba983c	140	int (graph_parse_endpoint)(const struct fwnode_handle fwnode,
3b27d00e	141	struct fwnode_endpoint *endpoint);
2d09e6eb	142	int (add_links)(struct fwnode_handle fwnode);
3708184a SA	143	};
	144
	145	#define fwnode_has_op(fwnode, op) \
	146	((fwnode) && (fwnode)->ops && (fwnode)->ops->op)
	147	#define fwnode_call_int_op(fwnode, op, ...) \
	148	(fwnode ? (fwnode_has_op(fwnode, op) ? \
	149	(fwnode)->ops->op(fwnode, ## __VA_ARGS__) : -ENXIO) : \
	150	-EINVAL)
149f3b87 AS	151
	152	#define fwnode_call_bool_op(fwnode, op, ...) \
	153	(fwnode_has_op(fwnode, op) ? \
	154	(fwnode)->ops->op(fwnode, ## __VA_ARGS__) : false)
	155
3708184a SA	156	#define fwnode_call_ptr_op(fwnode, op, ...) \
	157	(fwnode_has_op(fwnode, op) ? \
	158	(fwnode)->ops->op(fwnode, ## __VA_ARGS__) : NULL)
	159	#define fwnode_call_void_op(fwnode, op, ...) \
	160	do { \
	161	if (fwnode_has_op(fwnode, op)) \
	162	(fwnode)->ops->op(fwnode, ## __VA_ARGS__); \
	163	} while (false)
372a67c0	164	#define get_dev_from_fwnode(fwnode) get_device((fwnode)->dev)
3708184a	165
01bb86b3 SK	166	static inline void fwnode_init(struct fwnode_handle *fwnode,
	167	const struct fwnode_operations *ops)
	168	{
	169	fwnode->ops = ops;
7b337cb3 SK	170	INIT_LIST_HEAD(&fwnode->consumers);
7b337cb3 SK	171	INIT_LIST_HEAD(&fwnode->suppliers);
01bb86b3 SK	172	}
01bb86b3 SK	173
74c782cf SK	174	static inline void fwnode_dev_initialized(struct fwnode_handle *fwnode,
	175	bool initialized)
	176	{
	177	if (IS_ERR_OR_NULL(fwnode))
	178	return;
	179
	180	if (initialized)
	181	fwnode->flags \|= FWNODE_FLAG_INITIALIZED;
	182	else
	183	fwnode->flags &= ~FWNODE_FLAG_INITIALIZED;
	184	}
	185
8375e74f	186	extern u32 fw_devlink_get_flags(void);
19d0f5f6	187	extern bool fw_devlink_is_strict(void);
7b337cb3 SK	188	int fwnode_link_add(struct fwnode_handle con, struct fwnode_handle sup);
7b337cb3 SK	189	void fwnode_links_purge(struct fwnode_handle *fwnode);
8375e74f	190
ce793486	191	#endif