include/linux/fwnode.h

   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/bits.h>
  13 #include <linux/err.h>
  14 #include <linux/list.h>
  15 #include <linux/types.h>
  16
  17 enum dev_dma_attr {
  18         DEV_DMA_NOT_SUPPORTED,
  19         DEV_DMA_NON_COHERENT,
  20         DEV_DMA_COHERENT,
  21 };
  22
  23 struct fwnode_operations;
  24 struct device;
  25
  26 /*
  27  * fwnode flags
  28  *
  29  * LINKS_ADDED: The fwnode has already be parsed to add fwnode links.
  30  * NOT_DEVICE:  The fwnode will never be populated as a struct device.
  31  * INITIALIZED: The hardware corresponding to fwnode has been initialized.
  32  * NEEDS_CHILD_BOUND_ON_ADD: For this fwnode/device to probe successfully, its
  33  *                           driver needs its child devices to be bound with
  34  *                           their respective drivers as soon as they are
  35  *                           added.
  36  * BEST_EFFORT: The fwnode/device needs to probe early and might be missing some
  37  *              suppliers. Only enforce ordering with suppliers that have
  38  *              drivers.
  39  */
  40 #define FWNODE_FLAG_LINKS_ADDED                 BIT(0)
  41 #define FWNODE_FLAG_NOT_DEVICE                  BIT(1)
  42 #define FWNODE_FLAG_INITIALIZED                 BIT(2)
  43 #define FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD    BIT(3)
  44 #define FWNODE_FLAG_BEST_EFFORT                 BIT(4)
  45 #define FWNODE_FLAG_VISITED                     BIT(5)
  46
  47 struct fwnode_handle {
  48         struct fwnode_handle *secondary;
  49         const struct fwnode_operations *ops;
  50
  51         /* The below is used solely by device links, don't use otherwise */
  52         struct device *dev;
  53         struct list_head suppliers;
  54         struct list_head consumers;
  55         u8 flags;
  56 };
  57
  58 /*
  59  * fwnode link flags
  60  *
  61  * CYCLE:       The fwnode link is part of a cycle. Don't defer probe.
  62  * IGNORE:      Completely ignore this link, even during cycle detection.
  63  */
  64 #define FWLINK_FLAG_CYCLE                       BIT(0)
  65 #define FWLINK_FLAG_IGNORE                      BIT(1)
  66
  67 struct fwnode_link {
  68         struct fwnode_handle *supplier;
  69         struct list_head s_hook;
  70         struct fwnode_handle *consumer;
  71         struct list_head c_hook;
  72         u8 flags;
  73 };
  74
  75 /**
  76  * struct fwnode_endpoint - Fwnode graph endpoint
  77  * @port: Port number
  78  * @id: Endpoint id
  79  * @local_fwnode: reference to the related fwnode
  80  */
  81 struct fwnode_endpoint {
  82         unsigned int port;
  83         unsigned int id;
  84         const struct fwnode_handle *local_fwnode;
  85 };
  86
  87 /*
  88  * ports and endpoints defined as software_nodes should all follow a common
  89  * naming scheme; use these macros to ensure commonality.
  90  */
  91 #define SWNODE_GRAPH_PORT_NAME_FMT              "port@%u"
  92 #define SWNODE_GRAPH_ENDPOINT_NAME_FMT          "endpoint@%u"
  93
  94 #define NR_FWNODE_REFERENCE_ARGS        8
  95
  96 /**
  97  * struct fwnode_reference_args - Fwnode reference with additional arguments
  98  * @fwnode:- A reference to the base fwnode
  99  * @nargs: Number of elements in @args array
 100  * @args: Integer arguments on the fwnode
 101  */
 102 struct fwnode_reference_args {
 103         struct fwnode_handle *fwnode;
 104         unsigned int nargs;
 105         u64 args[NR_FWNODE_REFERENCE_ARGS];
 106 };
 107
 108 /**
 109  * struct fwnode_operations - Operations for fwnode interface
 110  * @get: Get a reference to an fwnode.
 111  * @put: Put a reference to an fwnode.
 112  * @device_is_available: Return true if the device is available.
 113  * @device_get_match_data: Return the device driver match data.
 114  * @property_present: Return true if a property is present.
 115  * @property_read_int_array: Read an array of integer properties. Return zero on
 116  *                           success, a negative error code otherwise.
 117  * @property_read_string_array: Read an array of string properties. Return zero
 118  *                              on success, a negative error code otherwise.
 119  * @get_name: Return the name of an fwnode.
 120  * @get_name_prefix: Get a prefix for a node (for printing purposes).
 121  * @get_parent: Return the parent of an fwnode.
 122  * @get_next_child_node: Return the next child node in an iteration.
 123  * @get_named_child_node: Return a child node with a given name.
 124  * @get_reference_args: Return a reference pointed to by a property, with args
 125  * @graph_get_next_endpoint: Return an endpoint node in an iteration.
 126  * @graph_get_remote_endpoint: Return the remote endpoint node of a local
 127  *                             endpoint node.
 128  * @graph_get_port_parent: Return the parent node of a port node.
 129  * @graph_parse_endpoint: Parse endpoint for port and endpoint id.
 130  * @add_links:  Create fwnode links to all the suppliers of the fwnode. Return
 131  *              zero on success, a negative error code otherwise.
 132  */
 133 struct fwnode_operations {
 134         struct fwnode_handle *(*get)(struct fwnode_handle *fwnode);
 135         void (*put)(struct fwnode_handle *fwnode);
 136         bool (*device_is_available)(const struct fwnode_handle *fwnode);
 137         const void *(*device_get_match_data)(const struct fwnode_handle *fwnode,
 138                                              const struct device *dev);
 139         bool (*device_dma_supported)(const struct fwnode_handle *fwnode);
 140         enum dev_dma_attr
 141         (*device_get_dma_attr)(const struct fwnode_handle *fwnode);
 142         bool (*property_present)(const struct fwnode_handle *fwnode,
 143                                  const char *propname);
 144         int (*property_read_int_array)(const struct fwnode_handle *fwnode,
 145                                        const char *propname,
 146                                        unsigned int elem_size, void *val,
 147                                        size_t nval);
 148         int
 149         (*property_read_string_array)(const struct fwnode_handle *fwnode_handle,
 150                                       const char *propname, const char **val,
 151                                       size_t nval);
 152         const char *(*get_name)(const struct fwnode_handle *fwnode);
 153         const char *(*get_name_prefix)(const struct fwnode_handle *fwnode);
 154         struct fwnode_handle *(*get_parent)(const struct fwnode_handle *fwnode);
 155         struct fwnode_handle *
 156         (*get_next_child_node)(const struct fwnode_handle *fwnode,
 157                                struct fwnode_handle *child);
 158         struct fwnode_handle *
 159         (*get_named_child_node)(const struct fwnode_handle *fwnode,
 160                                 const char *name);
 161         int (*get_reference_args)(const struct fwnode_handle *fwnode,
 162                                   const char *prop, const char *nargs_prop,
 163                                   unsigned int nargs, unsigned int index,
 164                                   struct fwnode_reference_args *args);
 165         struct fwnode_handle *
 166         (*graph_get_next_endpoint)(const struct fwnode_handle *fwnode,
 167                                    struct fwnode_handle *prev);
 168         struct fwnode_handle *
 169         (*graph_get_remote_endpoint)(const struct fwnode_handle *fwnode);
 170         struct fwnode_handle *
 171         (*graph_get_port_parent)(struct fwnode_handle *fwnode);
 172         int (*graph_parse_endpoint)(const struct fwnode_handle *fwnode,
 173                                     struct fwnode_endpoint *endpoint);
 174         void __iomem *(*iomap)(struct fwnode_handle *fwnode, int index);
 175         int (*irq_get)(const struct fwnode_handle *fwnode, unsigned int index);
 176         int (*add_links)(struct fwnode_handle *fwnode);
 177 };
 178
 179 #define fwnode_has_op(fwnode, op)                                       \
 180         (!IS_ERR_OR_NULL(fwnode) && (fwnode)->ops && (fwnode)->ops->op)
 181
 182 #define fwnode_call_int_op(fwnode, op, ...)                             \
 183         (fwnode_has_op(fwnode, op) ?                                    \
 184          (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : (IS_ERR_OR_NULL(fwnode) ? -EINVAL : -ENXIO))
 185
 186 #define fwnode_call_bool_op(fwnode, op, ...)            \
 187         (fwnode_has_op(fwnode, op) ?                    \
 188          (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : false)
 189
 190 #define fwnode_call_ptr_op(fwnode, op, ...)             \
 191         (fwnode_has_op(fwnode, op) ?                    \
 192          (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : NULL)
 193 #define fwnode_call_void_op(fwnode, op, ...)                            \
 194         do {                                                            \
 195                 if (fwnode_has_op(fwnode, op))                          \
 196                         (fwnode)->ops->op(fwnode, ## __VA_ARGS__);      \
 197         } while (false)
 198
 199 static inline void fwnode_init(struct fwnode_handle *fwnode,
 200                                const struct fwnode_operations *ops)
 201 {
 202         fwnode->ops = ops;
 203         INIT_LIST_HEAD(&fwnode->consumers);
 204         INIT_LIST_HEAD(&fwnode->suppliers);
 205 }
 206
 207 static inline void fwnode_dev_initialized(struct fwnode_handle *fwnode,
 208                                           bool initialized)
 209 {
 210         if (IS_ERR_OR_NULL(fwnode))
 211                 return;
 212
 213         if (initialized)
 214                 fwnode->flags |= FWNODE_FLAG_INITIALIZED;
 215         else
 216                 fwnode->flags &= ~FWNODE_FLAG_INITIALIZED;
 217 }
 218
 219 int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup,
 220                     u8 flags);
 221 void fwnode_links_purge(struct fwnode_handle *fwnode);
 222 void fw_devlink_purge_absent_suppliers(struct fwnode_handle *fwnode);
 223 bool fw_devlink_is_strict(void);
 224
 225 #endif