216 lines
7.5 KiB
C
216 lines
7.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* fwnode.h - Firmware device node object handle type definition.
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*
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* Copyright (C) 2015, Intel Corporation
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* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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*/
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#ifndef _LINUX_FWNODE_H_
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#define _LINUX_FWNODE_H_
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/bits.h>
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#include <linux/err.h>
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struct fwnode_operations;
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struct device;
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/*
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* fwnode flags
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*
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* LINKS_ADDED: The fwnode has already be parsed to add fwnode links.
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* NOT_DEVICE: The fwnode will never be populated as a struct device.
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* INITIALIZED: The hardware corresponding to fwnode has been initialized.
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* NEEDS_CHILD_BOUND_ON_ADD: For this fwnode/device to probe successfully, its
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* driver needs its child devices to be bound with
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* their respective drivers as soon as they are
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* added.
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* BEST_EFFORT: The fwnode/device needs to probe early and might be missing some
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* suppliers. Only enforce ordering with suppliers that have
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* drivers.
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*/
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#define FWNODE_FLAG_LINKS_ADDED BIT(0)
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#define FWNODE_FLAG_NOT_DEVICE BIT(1)
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#define FWNODE_FLAG_INITIALIZED BIT(2)
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#define FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD BIT(3)
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#define FWNODE_FLAG_BEST_EFFORT BIT(4)
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#define FWNODE_FLAG_VISITED BIT(5)
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struct fwnode_handle {
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struct fwnode_handle *secondary;
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const struct fwnode_operations *ops;
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struct device *dev;
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struct list_head suppliers;
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struct list_head consumers;
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u8 flags;
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};
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/*
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* fwnode link flags
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*
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* CYCLE: The fwnode link is part of a cycle. Don't defer probe.
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*/
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#define FWLINK_FLAG_CYCLE BIT(0)
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struct fwnode_link {
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struct fwnode_handle *supplier;
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struct list_head s_hook;
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struct fwnode_handle *consumer;
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struct list_head c_hook;
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u8 flags;
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};
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/**
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* struct fwnode_endpoint - Fwnode graph endpoint
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* @port: Port number
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* @id: Endpoint id
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* @local_fwnode: reference to the related fwnode
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*/
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struct fwnode_endpoint {
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unsigned int port;
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unsigned int id;
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const struct fwnode_handle *local_fwnode;
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};
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/*
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* ports and endpoints defined as software_nodes should all follow a common
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* naming scheme; use these macros to ensure commonality.
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*/
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#define SWNODE_GRAPH_PORT_NAME_FMT "port@%u"
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#define SWNODE_GRAPH_ENDPOINT_NAME_FMT "endpoint@%u"
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#define NR_FWNODE_REFERENCE_ARGS 8
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/**
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* struct fwnode_reference_args - Fwnode reference with additional arguments
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* @fwnode:- A reference to the base fwnode
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* @nargs: Number of elements in @args array
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* @args: Integer arguments on the fwnode
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*/
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struct fwnode_reference_args {
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struct fwnode_handle *fwnode;
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unsigned int nargs;
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u64 args[NR_FWNODE_REFERENCE_ARGS];
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};
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/**
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* struct fwnode_operations - Operations for fwnode interface
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* @get: Get a reference to an fwnode.
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* @put: Put a reference to an fwnode.
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* @device_is_available: Return true if the device is available.
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* @device_get_match_data: Return the device driver match data.
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* @property_present: Return true if a property is present.
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* @property_read_int_array: Read an array of integer properties. Return zero on
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* success, a negative error code otherwise.
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* @property_read_string_array: Read an array of string properties. Return zero
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* on success, a negative error code otherwise.
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* @get_name: Return the name of an fwnode.
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* @get_name_prefix: Get a prefix for a node (for printing purposes).
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* @get_parent: Return the parent of an fwnode.
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* @get_next_child_node: Return the next child node in an iteration.
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* @get_named_child_node: Return a child node with a given name.
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* @get_reference_args: Return a reference pointed to by a property, with args
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* @graph_get_next_endpoint: Return an endpoint node in an iteration.
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* @graph_get_remote_endpoint: Return the remote endpoint node of a local
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* endpoint node.
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* @graph_get_port_parent: Return the parent node of a port node.
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* @graph_parse_endpoint: Parse endpoint for port and endpoint id.
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* @add_links: Create fwnode links to all the suppliers of the fwnode. Return
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* zero on success, a negative error code otherwise.
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*/
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struct fwnode_operations {
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struct fwnode_handle *(*get)(struct fwnode_handle *fwnode);
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void (*put)(struct fwnode_handle *fwnode);
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bool (*device_is_available)(const struct fwnode_handle *fwnode);
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const void *(*device_get_match_data)(const struct fwnode_handle *fwnode,
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const struct device *dev);
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bool (*device_dma_supported)(const struct fwnode_handle *fwnode);
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enum dev_dma_attr
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(*device_get_dma_attr)(const struct fwnode_handle *fwnode);
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bool (*property_present)(const struct fwnode_handle *fwnode,
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const char *propname);
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int (*property_read_int_array)(const struct fwnode_handle *fwnode,
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const char *propname,
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unsigned int elem_size, void *val,
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size_t nval);
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int
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(*property_read_string_array)(const struct fwnode_handle *fwnode_handle,
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const char *propname, const char **val,
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size_t nval);
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const char *(*get_name)(const struct fwnode_handle *fwnode);
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const char *(*get_name_prefix)(const struct fwnode_handle *fwnode);
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struct fwnode_handle *(*get_parent)(const struct fwnode_handle *fwnode);
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struct fwnode_handle *
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(*get_next_child_node)(const struct fwnode_handle *fwnode,
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struct fwnode_handle *child);
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struct fwnode_handle *
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(*get_named_child_node)(const struct fwnode_handle *fwnode,
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const char *name);
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int (*get_reference_args)(const struct fwnode_handle *fwnode,
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const char *prop, const char *nargs_prop,
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unsigned int nargs, unsigned int index,
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struct fwnode_reference_args *args);
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struct fwnode_handle *
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(*graph_get_next_endpoint)(const struct fwnode_handle *fwnode,
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struct fwnode_handle *prev);
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struct fwnode_handle *
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(*graph_get_remote_endpoint)(const struct fwnode_handle *fwnode);
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struct fwnode_handle *
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(*graph_get_port_parent)(struct fwnode_handle *fwnode);
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int (*graph_parse_endpoint)(const struct fwnode_handle *fwnode,
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struct fwnode_endpoint *endpoint);
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void __iomem *(*iomap)(struct fwnode_handle *fwnode, int index);
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int (*irq_get)(const struct fwnode_handle *fwnode, unsigned int index);
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int (*add_links)(struct fwnode_handle *fwnode);
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};
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#define fwnode_has_op(fwnode, op) \
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(!IS_ERR_OR_NULL(fwnode) && (fwnode)->ops && (fwnode)->ops->op)
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#define fwnode_call_int_op(fwnode, op, ...) \
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(fwnode_has_op(fwnode, op) ? \
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(fwnode)->ops->op(fwnode, ## __VA_ARGS__) : (IS_ERR_OR_NULL(fwnode) ? -EINVAL : -ENXIO))
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#define fwnode_call_bool_op(fwnode, op, ...) \
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(fwnode_has_op(fwnode, op) ? \
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(fwnode)->ops->op(fwnode, ## __VA_ARGS__) : false)
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#define fwnode_call_ptr_op(fwnode, op, ...) \
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(fwnode_has_op(fwnode, op) ? \
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(fwnode)->ops->op(fwnode, ## __VA_ARGS__) : NULL)
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#define fwnode_call_void_op(fwnode, op, ...) \
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do { \
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if (fwnode_has_op(fwnode, op)) \
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(fwnode)->ops->op(fwnode, ## __VA_ARGS__); \
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} while (false)
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#define get_dev_from_fwnode(fwnode) get_device((fwnode)->dev)
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static inline void fwnode_init(struct fwnode_handle *fwnode,
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const struct fwnode_operations *ops)
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{
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fwnode->ops = ops;
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INIT_LIST_HEAD(&fwnode->consumers);
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INIT_LIST_HEAD(&fwnode->suppliers);
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}
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static inline void fwnode_dev_initialized(struct fwnode_handle *fwnode,
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bool initialized)
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{
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if (IS_ERR_OR_NULL(fwnode))
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return;
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if (initialized)
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fwnode->flags |= FWNODE_FLAG_INITIALIZED;
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else
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fwnode->flags &= ~FWNODE_FLAG_INITIALIZED;
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}
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extern bool fw_devlink_is_strict(void);
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int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup);
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void fwnode_links_purge(struct fwnode_handle *fwnode);
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void fw_devlink_purge_absent_suppliers(struct fwnode_handle *fwnode);
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#endif
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