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/* 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/bits.h> #include <linux/err.h> #include <linux/list.h> #include <linux/types.h> enum dev_dma_attr { DEV_DMA_NOT_SUPPORTED, DEV_DMA_NON_COHERENT, DEV_DMA_COHERENT, }; struct fwnode_operations; struct device; /* * fwnode 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. * NEEDS_CHILD_BOUND_ON_ADD: For this fwnode/device to probe successfully, its * driver needs its child devices to be bound with * their respective drivers as soon as they are * added. * BEST_EFFORT: The fwnode/device needs to probe early and might be missing some * suppliers. Only enforce ordering with suppliers that have * drivers. */ #define FWNODE_FLAG_LINKS_ADDED BIT(0) #define FWNODE_FLAG_NOT_DEVICE BIT(1) #define FWNODE_FLAG_INITIALIZED BIT(2) #define FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD BIT(3) #define FWNODE_FLAG_BEST_EFFORT BIT(4) #define FWNODE_FLAG_VISITED BIT(5) struct fwnode_handle { struct fwnode_handle *secondary; const struct fwnode_operations *ops; /* The below is used solely by device links, don't use otherwise */ struct device *dev; struct list_head suppliers; struct list_head consumers; u8 flags; }; /* * fwnode link flags * * CYCLE: The fwnode link is part of a cycle. Don't defer probe. * IGNORE: Completely ignore this link, even during cycle detection. */ #define FWLINK_FLAG_CYCLE BIT(0) #define FWLINK_FLAG_IGNORE BIT(1) struct fwnode_link { struct fwnode_handle *supplier; struct list_head s_hook; struct fwnode_handle *consumer; struct list_head c_hook; u8 flags; }; /** * 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 16 /** * 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_bool: Return a boolean property value. * @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 (*device_dma_supported)(const struct fwnode_handle *fwnode); enum dev_dma_attr (*device_get_dma_attr)(const struct fwnode_handle *fwnode); bool (*property_present)(const struct fwnode_handle *fwnode, const char *propname); bool (*property_read_bool)(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); void __iomem *(*iomap)(struct fwnode_handle *fwnode, int index); int (*irq_get)(const struct fwnode_handle *fwnode, unsigned int index); int (*add_links)(struct fwnode_handle *fwnode); }; #define fwnode_has_op(fwnode, op) \ (!IS_ERR_OR_NULL(fwnode) && (fwnode)->ops && (fwnode)->ops->op) #define fwnode_call_int_op(fwnode, op, ...) \ (fwnode_has_op(fwnode, op) ? \ (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : (IS_ERR_OR_NULL(fwnode) ? -EINVAL : -ENXIO)) #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) 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; } int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup, u8 flags); void fwnode_links_purge(struct fwnode_handle *fwnode); void fw_devlink_purge_absent_suppliers(struct fwnode_handle *fwnode); bool fw_devlink_is_strict(void); #endif