1 /* SPDX-License-Identifier: GPL-2.0-only */ 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> 7 */ 8 9 #ifndef _LINUX_FWNODE_H_ 10 #define _LINUX_FWNODE_H_ 11 12 #include <linux/types.h> 13 14 struct fwnode_operations; 15 struct device; 16 17 struct fwnode_handle { 18 struct fwnode_handle *secondary; 19 const struct fwnode_operations *ops; 20 struct device *dev; 21 }; 22 23 /** 24 * struct fwnode_endpoint - Fwnode graph endpoint 25 * @port: Port number 26 * @id: Endpoint id 27 * @local_fwnode: reference to the related fwnode 28 */ 29 struct fwnode_endpoint { 30 unsigned int port; 31 unsigned int id; 32 const struct fwnode_handle *local_fwnode; 33 }; 34 35 #define NR_FWNODE_REFERENCE_ARGS 8 36 37 /** 38 * struct fwnode_reference_args - Fwnode reference with additional arguments 39 * @fwnode:- A reference to the base fwnode 40 * @nargs: Number of elements in @args array 41 * @args: Integer arguments on the fwnode 42 */ 43 struct fwnode_reference_args { 44 struct fwnode_handle *fwnode; 45 unsigned int nargs; 46 u64 args[NR_FWNODE_REFERENCE_ARGS]; 47 }; 48 49 /** 50 * struct fwnode_operations - Operations for fwnode interface 51 * @get: Get a reference to an fwnode. 52 * @put: Put a reference to an fwnode. 53 * @device_is_available: Return true if the device is available. 54 * @device_get_match_data: Return the device driver match data. 55 * @property_present: Return true if a property is present. 56 * @property_read_int_array: Read an array of integer properties. Return zero on 57 * success, a negative error code otherwise. 58 * @property_read_string_array: Read an array of string properties. Return zero 59 * on success, a negative error code otherwise. 60 * @get_name: Return the name of an fwnode. 61 * @get_name_prefix: Get a prefix for a node (for printing purposes). 62 * @get_parent: Return the parent of an fwnode. 63 * @get_next_child_node: Return the next child node in an iteration. 64 * @get_named_child_node: Return a child node with a given name. 65 * @get_reference_args: Return a reference pointed to by a property, with args 66 * @graph_get_next_endpoint: Return an endpoint node in an iteration. 67 * @graph_get_remote_endpoint: Return the remote endpoint node of a local 68 * endpoint node. 69 * @graph_get_port_parent: Return the parent node of a port node. 70 * @graph_parse_endpoint: Parse endpoint for port and endpoint id. 71 * @add_links: Called after the device corresponding to the fwnode is added 72 * using device_add(). The function is expected to create device 73 * links to all the suppliers of the device that are available at 74 * the time this function is called. The function must NOT stop 75 * at the first failed device link if other unlinked supplier 76 * devices are present in the system. This is necessary for the 77 * driver/bus sync_state() callbacks to work correctly. 78 * 79 * For example, say Device-C depends on suppliers Device-S1 and 80 * Device-S2 and the dependency is listed in that order in the 81 * firmware. Say, S1 gets populated from the firmware after 82 * late_initcall_sync(). Say S2 is populated and probed way 83 * before that in device_initcall(). When C is populated, if this 84 * add_links() function doesn't continue past a "failed linking to 85 * S1" and continue linking C to S2, then S2 will get a 86 * sync_state() callback before C is probed. This is because from 87 * the perspective of S2, C was never a consumer when its 88 * sync_state() evaluation is done. To avoid this, the add_links() 89 * function has to go through all available suppliers of the 90 * device (that corresponds to this fwnode) and link to them 91 * before returning. 92 * 93 * If some suppliers are not yet available (indicated by an error 94 * return value), this function will be called again when other 95 * devices are added to allow creating device links to any newly 96 * available suppliers. 97 * 98 * Return 0 if device links have been successfully created to all 99 * the known suppliers of this device or if the supplier 100 * information is not known. 101 * 102 * Return -ENODEV if the suppliers needed for probing this device 103 * have not been registered yet (because device links can only be 104 * created to devices registered with the driver core). 105 * 106 * Return -EAGAIN if some of the suppliers of this device have not 107 * been registered yet, but none of those suppliers are necessary 108 * for probing the device. 109 */ 110 struct fwnode_operations { 111 struct fwnode_handle *(*get)(struct fwnode_handle *fwnode); 112 void (*put)(struct fwnode_handle *fwnode); 113 bool (*device_is_available)(const struct fwnode_handle *fwnode); 114 const void *(*device_get_match_data)(const struct fwnode_handle *fwnode, 115 const struct device *dev); 116 bool (*property_present)(const struct fwnode_handle *fwnode, 117 const char *propname); 118 int (*property_read_int_array)(const struct fwnode_handle *fwnode, 119 const char *propname, 120 unsigned int elem_size, void *val, 121 size_t nval); 122 int 123 (*property_read_string_array)(const struct fwnode_handle *fwnode_handle, 124 const char *propname, const char **val, 125 size_t nval); 126 const char *(*get_name)(const struct fwnode_handle *fwnode); 127 const char *(*get_name_prefix)(const struct fwnode_handle *fwnode); 128 struct fwnode_handle *(*get_parent)(const struct fwnode_handle *fwnode); 129 struct fwnode_handle * 130 (*get_next_child_node)(const struct fwnode_handle *fwnode, 131 struct fwnode_handle *child); 132 struct fwnode_handle * 133 (*get_named_child_node)(const struct fwnode_handle *fwnode, 134 const char *name); 135 int (*get_reference_args)(const struct fwnode_handle *fwnode, 136 const char *prop, const char *nargs_prop, 137 unsigned int nargs, unsigned int index, 138 struct fwnode_reference_args *args); 139 struct fwnode_handle * 140 (*graph_get_next_endpoint)(const struct fwnode_handle *fwnode, 141 struct fwnode_handle *prev); 142 struct fwnode_handle * 143 (*graph_get_remote_endpoint)(const struct fwnode_handle *fwnode); 144 struct fwnode_handle * 145 (*graph_get_port_parent)(struct fwnode_handle *fwnode); 146 int (*graph_parse_endpoint)(const struct fwnode_handle *fwnode, 147 struct fwnode_endpoint *endpoint); 148 int (*add_links)(const struct fwnode_handle *fwnode, 149 struct device *dev); 150 }; 151 152 #define fwnode_has_op(fwnode, op) \ 153 ((fwnode) && (fwnode)->ops && (fwnode)->ops->op) 154 #define fwnode_call_int_op(fwnode, op, ...) \ 155 (fwnode ? (fwnode_has_op(fwnode, op) ? \ 156 (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : -ENXIO) : \ 157 -EINVAL) 158 159 #define fwnode_call_bool_op(fwnode, op, ...) \ 160 (fwnode_has_op(fwnode, op) ? \ 161 (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : false) 162 163 #define fwnode_call_ptr_op(fwnode, op, ...) \ 164 (fwnode_has_op(fwnode, op) ? \ 165 (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : NULL) 166 #define fwnode_call_void_op(fwnode, op, ...) \ 167 do { \ 168 if (fwnode_has_op(fwnode, op)) \ 169 (fwnode)->ops->op(fwnode, ## __VA_ARGS__); \ 170 } while (false) 171 #define get_dev_from_fwnode(fwnode) get_device((fwnode)->dev) 172 173 extern u32 fw_devlink_get_flags(void); 174 void fw_devlink_pause(void); 175 void fw_devlink_resume(void); 176 177 #endif 178